X-Git-Url: https://git.exim.org/users/heiko/exim.git/blobdiff_plain/72c9e342b1a4a410efc165a38281da2f5b69ad90..2c98a555f730e665a305652a84bd558f1fed83f6:/doc/doc-docbook/spec.xfpt diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index ece837d03..d7d981ea7 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -45,14 +45,14 @@ . Update the Copyright year (only) when changing content. . ///////////////////////////////////////////////////////////////////////////// -.set previousversion "4.80" +.set previousversion "4.86" .include ./local_params .set ACL "access control lists (ACLs)" .set I "    " .macro copyyear -2014 +2015 .endmacro . ///////////////////////////////////////////////////////////////////////////// @@ -1575,7 +1575,7 @@ If a host is unreachable for a period of time, a number of messages may be waiting for it by the time it recovers, and sending them in a single SMTP connection is clearly beneficial. Whenever a delivery to a remote host is deferred, -.cindex "hints database" +.cindex "hints database" "deferred deliveries" Exim makes a note in its hints database, and whenever a successful SMTP delivery has happened, it looks to see if any other messages are waiting for the same host. If any are found, they are sent over the same SMTP @@ -1985,10 +1985,10 @@ Two different types of DNS record for handling IPv6 addresses have been defined. AAAA records (analogous to A records for IPv4) are in use, and are currently seen as the mainstream. Another record type called A6 was proposed as better than AAAA because it had more flexibility. However, it was felt to be -over-complex, and its status was reduced to &"experimental"&. It is not known -if anyone is actually using A6 records. Exim has support for A6 records, but -this is included only if you set &`SUPPORT_A6=YES`& in &_Local/Makefile_&. The -support has not been tested for some time. +over-complex, and its status was reduced to &"experimental"&. +Exim used to +have a compile option for including A6 record support but this has now been +withdrawn. @@ -2032,9 +2032,6 @@ For example, on a Sun system running Solaris 8, the directory .cindex "symbolic link" "to source files" Symbolic links to relevant source files are installed in the build directory. -&*Warning*&: The &%-j%& (parallel) flag must not be used with &'make'&; the -building process fails if it is set. - If this is the first time &'make'& has been run, it calls a script that builds a make file inside the build directory, using the configuration files from the &_Local_& directory. The new make file is then passed to another instance of @@ -3110,8 +3107,12 @@ users, the output is as in this example: .code mysql_servers = .endd -If &%configure_file%& is given as an argument, the name of the run time -configuration file is output. +If &%config%& is given as an argument, the config is +output, as it was parsed, any include file resolved, any comment removed. + +If &%config_file%& is given as an argument, the name of the run time +configuration file is output. (&%configure_file%& works too, for +backward compatibility.) If a list of configuration files was supplied, the value that is output here is the name of the file that was actually used. @@ -3811,6 +3812,12 @@ This option is not intended for use by external callers. It is used internally by Exim in conjunction with the &%-MC%& option. It signifies that the connection to the remote host has been authenticated. +.vitem &%-MCD%& +.oindex "&%-MCD%&" +This option is not intended for use by external callers. It is used internally +by Exim in conjunction with the &%-MC%& option. It signifies that the +remote host supports the ESMTP &_DSN_& extension. + .vitem &%-MCP%& .oindex "&%-MCP%&" This option is not intended for use by external callers. It is used internally @@ -4221,6 +4228,20 @@ option sets the IP interface address value. A port number may be included, using the same syntax as for &%-oMa%&. The interface address is placed in &$received_ip_address$& and the port number, if present, in &$received_port$&. +.vitem &%-oMm%&&~<&'message&~reference'&> +.oindex "&%-oMm%&" +.cindex "message reference" "message reference, specifying for local message" +See &%-oMa%& above for general remarks about the &%-oM%& options. The &%-oMm%& +option sets the message reference, e.g. message-id, and is logged during +delivery. This is useful when some kind of audit trail is required to tie +messages together. The format of the message reference is checked and will +abort if the format is invalid. The option will only be accepted if exim is +running in trusted mode, not as any regular user. + +The best example of a message reference is when Exim sends a bounce message. +The message reference is the message-id of the original message for which Exim +is sending the bounce. + .vitem &%-oMr%&&~<&'protocol&~name'&> .oindex "&%-oMr%&" .cindex "protocol, specifying for local message" @@ -4626,6 +4647,13 @@ this option. .oindex "&%-X%&" This option is interpreted by Sendmail to cause debug information to be sent to the named file. It is ignored by Exim. + +.vitem &%-z%&&~<&'log-line'&> +.oindex "&%-z%&" +This option writes its argument to Exim's logfile. +Use is restricted to administrators; the intent is for operational notes. +Quotes should be used to maintain a multi-word item as a single argument, +under most shells. .endlist .ecindex IIDclo1 @@ -4776,8 +4804,8 @@ help with this. See the comments in &_src/EDITME_& for details. Exim's configuration file is divided into a number of different parts. General option settings must always appear at the start of the file. The other parts are all optional, and may appear in any order. Each part other than the first -is introduced by the word &"begin"& followed by the name of the part. The -optional parts are: +is introduced by the word &"begin"& followed by at least one literal +space, and the name of the part. The optional parts are: .ilist &'ACL'&: Access control lists for controlling incoming SMTP mail (see chapter @@ -4982,7 +5010,8 @@ message_size_limit = 50M message_size_limit = 100M .endif .endd -sets a message size limit of 50M if the macro &`AAA`& is defined, and 100M +sets a message size limit of 50M if the macro &`AAA`& is defined +(or &`A`& or &`AA`&), and 100M otherwise. If there is more than one macro named on the line, the condition is true if any of them are defined. That is, it is an &"or"& condition. To obtain an &"and"& condition, you need to use nested &`.ifdef`&s. @@ -5204,7 +5233,7 @@ list items, it is not ignored when parsing the list. The space after the first colon in the example above is necessary. If it were not there, the list would be interpreted as the two items 127.0.0.1:: and 1. -.section "Changing list separators" "SECID53" +.section "Changing list separators" "SECTlistsepchange" .cindex "list separator" "changing" .cindex "IPv6" "addresses in lists" Doubling colons in IPv6 addresses is an unwelcome chore, so a mechanism was @@ -5544,15 +5573,20 @@ The next two lines are concerned with &'ident'& callbacks, as defined by RFC 1413 (hence their names): .code rfc1413_hosts = * -rfc1413_query_timeout = 5s +rfc1413_query_timeout = 0s +.endd +These settings cause Exim to avoid ident callbacks for all incoming SMTP calls. +Few hosts offer RFC1413 service these days; calls have to be +terminated by a timeout and this needlessly delays the startup +of an incoming SMTP connection. +If you have hosts for which you trust RFC1413 and need this +information, you can change this. + +This line enables an efficiency SMTP option. It is negotiated by clients +and not expected to cause problems but can be disabled if needed. +.code +prdr_enable = true .endd -These settings cause Exim to make ident callbacks for all incoming SMTP calls. -You can limit the hosts to which these calls are made, or change the timeout -that is used. If you set the timeout to zero, all ident calls are disabled. -Although they are cheap and can provide useful information for tracing problem -messages, some hosts and firewalls have problems with ident calls. This can -result in a timeout instead of an immediate refused connection, leading to -delays on starting up an incoming SMTP session. When Exim receives messages over SMTP connections, it expects all addresses to be fully qualified with a domain, as required by the SMTP definition. However, @@ -5565,6 +5599,13 @@ find that they send unqualified addresses. The two commented-out options: show how you can specify hosts that are permitted to send unqualified sender and recipient addresses, respectively. +The &%log_selector%& option is used to increase the detail of logging +over the default: +.code +log_selector = +smtp_protocol_error +smtp_syntax_error \ + +tls_certificate_verified +.endd + The &%percent_hack_domains%& option is also commented out: .code # percent_hack_domains = @@ -5988,9 +6029,14 @@ One remote transport and four local transports are defined. .code remote_smtp: driver = smtp + hosts_try_prdr = * .endd -This transport is used for delivering messages over SMTP connections. All its -options are defaulted. The list of remote hosts comes from the router. +This transport is used for delivering messages over SMTP connections. +The list of remote hosts comes from the router. +The &%hosts_try_prdr%& option enables an efficiency SMTP option. +It is negotiated between client and server +and not expected to cause problems but can be disabled if needed. +All other options are defaulted. .code local_delivery: driver = appendfile @@ -6018,8 +6064,8 @@ address_pipe: .endd This transport is used for handling deliveries to pipes that are generated by redirection (aliasing or users' &_.forward_& files). The &%return_output%& -option specifies that any output generated by the pipe is to be returned to the -sender. +option specifies that any output on stdout or stderr generated by the pipe is to +be returned to the sender. .code address_file: driver = appendfile @@ -6201,12 +6247,14 @@ cause parts of the string to be replaced by data that is obtained from the lookup. Lookups of this type are conditional expansion items. Different results can be defined for the cases of lookup success and failure. See chapter &<>&, where string expansions are described in detail. +The key for the lookup is specified as part of the string expansion. .next Lists of domains, hosts, and email addresses can contain lookup requests as a way of avoiding excessively long linear lists. In this case, the data that is returned by the lookup is often (but not always) discarded; whether the lookup succeeds or fails is what really counts. These kinds of list are described in chapter &<>&. +The key for the lookup is given by the context in which the list is expanded. .endlist String expansions, lists, and lookups interact with each other in such a way @@ -6840,9 +6888,26 @@ is used on its own as the result. If the lookup does not succeed, the &`fail`& keyword causes a &'forced expansion failure'& &-- see section &<>& for an explanation of what this means. -The supported DNS record types are A, CNAME, MX, NS, PTR, SPF, SRV, and TXT, -and, when Exim is compiled with IPv6 support, AAAA (and A6 if that is also -configured). If no type is given, TXT is assumed. When the type is PTR, +The supported DNS record types are A, CNAME, MX, NS, PTR, SOA, SPF, SRV, TLSA +and TXT, and, when Exim is compiled with IPv6 support, AAAA. +If no type is given, TXT is assumed. + +For any record type, if multiple records are found, the data is returned as a +concatenation, with newline as the default separator. The order, of course, +depends on the DNS resolver. You can specify a different separator character +between multiple records by putting a right angle-bracket followed immediately +by the new separator at the start of the query. For example: +.code +${lookup dnsdb{>: a=host1.example}} +.endd +It is permitted to specify a space as the separator character. Further +white space is ignored. +For lookup types that return multiple fields per record, +an alternate field separator can be specified using a comma after the main +separator character, followed immediately by the field separator. + +.cindex "PTR record" "in &(dnsdb)& lookup" +When the type is PTR, the data can be an IP address, written as normal; inversion and the addition of &%in-addr.arpa%& or &%ip6.arpa%& happens automatically. For example: .code @@ -6856,25 +6921,14 @@ altered and nothing is added. For an MX lookup, both the preference value and the host name are returned for each record, separated by a space. For an SRV lookup, the priority, weight, port, and host name are returned for each record, separated by spaces. - -For any record type, if multiple records are found (or, for A6 lookups, if a -single record leads to multiple addresses), the data is returned as a -concatenation, with newline as the default separator. The order, of course, -depends on the DNS resolver. You can specify a different separator character -between multiple records by putting a right angle-bracket followed immediately -by the new separator at the start of the query. For example: -.code -${lookup dnsdb{>: a=host1.example}} -.endd -It is permitted to specify a space as the separator character. Further -white space is ignored. +The field separator can be modified as above. .cindex "TXT record" "in &(dnsdb)& lookup" .cindex "SPF record" "in &(dnsdb)& lookup" For TXT records with multiple items of data, only the first item is returned, -unless a separator for them is specified using a comma after the separator -character followed immediately by the TXT record item separator. To concatenate -items without a separator, use a semicolon instead. For SPF records the +unless a field separator is specified. +To concatenate items without a separator, use a semicolon instead. +For SPF records the default behaviour is to concatenate multiple items without using a separator. .code ${lookup dnsdb{>\n,: txt=a.b.example}} @@ -6884,6 +6938,75 @@ ${lookup dnsdb{spf=example.org}} It is permitted to specify a space as the separator character. Further white space is ignored. +.cindex "SOA record" "in &(dnsdb)& lookup" +For an SOA lookup, while no result is obtained the lookup is redone with +successively more leading components dropped from the given domain. +Only the primary-nameserver field is returned unless a field separator is +specified. +.code +${lookup dnsdb{>:,; soa=a.b.example.com}} +.endd + +.section "Dnsdb lookup modifiers" "SECTdnsdb_mod" +.cindex "dnsdb modifiers" +.cindex "modifiers" "dnsdb" +.cindex "options" "dnsdb" +Modifiers for &(dnsdb)& lookups are given by optional keywords, +each followed by a comma, +that may appear before the record type. + +The &(dnsdb)& lookup fails only if all the DNS lookups fail. If there is a +temporary DNS error for any of them, the behaviour is controlled by +a defer-option modifier. +The possible keywords are +&"defer_strict"&, &"defer_never"&, and &"defer_lax"&. +With &"strict"& behaviour, any temporary DNS error causes the +whole lookup to defer. With &"never"& behaviour, a temporary DNS error is +ignored, and the behaviour is as if the DNS lookup failed to find anything. +With &"lax"& behaviour, all the queries are attempted, but a temporary DNS +error causes the whole lookup to defer only if none of the other lookups +succeed. The default is &"lax"&, so the following lookups are equivalent: +.code +${lookup dnsdb{defer_lax,a=one.host.com:two.host.com}} +${lookup dnsdb{a=one.host.com:two.host.com}} +.endd +Thus, in the default case, as long as at least one of the DNS lookups +yields some data, the lookup succeeds. + +.cindex "DNSSEC" "dns lookup" +Use of &(DNSSEC)& is controlled by a dnssec modifier. +The possible keywords are +&"dnssec_strict"&, &"dnssec_lax"&, and &"dnssec_never"&. +With &"strict"& or &"lax"& DNSSEC information is requested +with the lookup. +With &"strict"& a response from the DNS resolver that +is not labelled as authenticated data +is treated as equivalent to a temporary DNS error. +The default is &"never"&. + +See also the &$lookup_dnssec_authenticated$& variable. + +.cindex timeout "dns lookup" +.cindex "DNS" timeout +Timeout for the dnsdb lookup can be controlled by a retrans modifier. +The form is &"retrans_VAL"& where VAL is an Exim time specification +(e.g. &"5s"&). +The default value is set by the main configuration option &%dns_retrans%&. + +Retries for the dnsdb lookup can be controlled by a retry modifier. +The form if &"retry_VAL"& where VAL is an integer. +The default count is set by the main configuration option &%dns_retry%&. + +.new +.cindex cacheing "of dns lookup" +.cindex TTL "of dns lookup" +.cindex DNS TTL +Dnsdb lookup results are cached within a single process (and its children). +The cache entry lifetime is limited to the smallest time-to-live (TTL) +value of the set of returned DNS records. +.wen + + .section "Pseudo dnsdb record types" "SECID66" .cindex "MX record" "in &(dnsdb)& lookup" By default, both the preference value and the host name are returned for @@ -6932,7 +7055,7 @@ The authorization code can be &"Y"& for yes, &"N"& for no, &"X"& for explicit authorization required but absent, or &"?"& for unknown. .cindex "A+" "in &(dnsdb)& lookup" -The pseudo-type A+ performs an A6 lookup (if configured) followed by an AAAA +The pseudo-type A+ performs an AAAA and then an A lookup. All results are returned; defer processing (see below) is handled separately for each lookup. Example: .code @@ -6959,23 +7082,6 @@ The data from each lookup is concatenated, with newline separators by default, in the same way that multiple DNS records for a single item are handled. A different separator can be specified, as described above. -The &(dnsdb)& lookup fails only if all the DNS lookups fail. If there is a -temporary DNS error for any of them, the behaviour is controlled by -an optional keyword followed by a comma that may appear before the record -type. The possible keywords are &"defer_strict"&, &"defer_never"&, and -&"defer_lax"&. With &"strict"& behaviour, any temporary DNS error causes the -whole lookup to defer. With &"never"& behaviour, a temporary DNS error is -ignored, and the behaviour is as if the DNS lookup failed to find anything. -With &"lax"& behaviour, all the queries are attempted, but a temporary DNS -error causes the whole lookup to defer only if none of the other lookups -succeed. The default is &"lax"&, so the following lookups are equivalent: -.code -${lookup dnsdb{defer_lax,a=one.host.com:two.host.com}} -${lookup dnsdb{a=one.host.com:two.host.com}} -.endd -Thus, in the default case, as long as at least one of the DNS lookups -yields some data, the lookup succeeds. - @@ -7040,7 +7146,6 @@ With sufficiently modern LDAP libraries, Exim supports forcing TLS over regular LDAP connections, rather than the SSL-on-connect &`ldaps`&. See the &%ldap_start_tls%& option. -.new Starting with Exim 4.83, the initialization of LDAP with TLS is more tightly controlled. Every part of the TLS configuration can be configured by settings in &_exim.conf_&. Depending on the version of the client libraries installed on @@ -7050,7 +7155,6 @@ certificates. This revealed a nuance where the current UID that exim was running as could affect which config files it read. With Exim 4.83, these methods become optional, only taking effect if not specifically set in &_exim.conf_&. -.wen .section "LDAP quoting" "SECID68" @@ -7198,6 +7302,7 @@ them. The following names are recognized: &`USER `& set the DN, for authenticating the LDAP bind &`PASS `& set the password, likewise &`REFERRALS `& set the referrals parameter +&`SERVERS `& set alternate server list for this query only &`SIZE `& set the limit for the number of entries returned &`TIME `& set the maximum waiting time for a query .endd @@ -7219,6 +7324,13 @@ Netscape SDK; for OpenLDAP no action is taken. The TIME parameter (also a number of seconds) is passed to the server to set a server-side limit on the time taken to complete a search. +The SERVERS parameter allows you to specify an alternate list of ldap servers +to use for an individual lookup. The global &%ldap_default_servers%& option provides a +default list of ldap servers, and a single lookup can specify a single ldap +server to use. But when you need to do a lookup with a list of servers that is +different than the default list (maybe different order, maybe a completely +different set of servers), the SERVERS parameter allows you to specify this +alternate list (colon-separated). Here is an example of an LDAP query in an Exim lookup that uses some of these values. This is a single line, folded to fit on the page: @@ -7290,30 +7402,38 @@ If you specify multiple attributes, the result contains space-separated, quoted strings, each preceded by the attribute name and an equals sign. Within the quotes, the quote character, backslash, and newline are escaped with backslashes, and commas are used to separate multiple values for the attribute. +Any commas in attribute values are doubled +(permitting treatment of the values as a comma-separated list). Apart from the escaping, the string within quotes takes the same form as the output when a single attribute is requested. Specifying no attributes is the same as specifying all of an entry's attributes. Here are some examples of the output format. The first line of each pair is an LDAP query, and the second is the data that is returned. The attribute called -&%attr1%& has two values, whereas &%attr2%& has only one value: +&%attr1%& has two values, one of them with an embedded comma, whereas +&%attr2%& has only one value: .code ldap:///o=base?attr1?sub?(uid=fred) -value1.1, value1.2 +value1.1,value1,,2 ldap:///o=base?attr2?sub?(uid=fred) value two ldap:///o=base?attr1,attr2?sub?(uid=fred) -attr1="value1.1, value1.2" attr2="value two" +attr1="value1.1,value1,,2" attr2="value two" ldap:///o=base??sub?(uid=fred) -objectClass="top" attr1="value1.1, value1.2" attr2="value two" +objectClass="top" attr1="value1.1,value1,,2" attr2="value two" .endd -The &%extract%& operator in string expansions can be used to pick out -individual fields from data that consists of &'key'&=&'value'& pairs. You can +You can make use of Exim's &%-be%& option to run expansion tests and thereby check the results of LDAP lookups. +The &%extract%& operator in string expansions can be used to pick out +individual fields from data that consists of &'key'&=&'value'& pairs. +The &%listextract%& operator should be used to pick out individual values +of attributes, even when only a single value is expected. +The doubling of embedded commas allows you to use the returned data as a +comma separated list (using the "<," syntax for changing the input list separator). @@ -7421,13 +7541,12 @@ a query is successfully processed. The result of a query may be that no data is found, but that is still a successful query. In other words, the list of servers provides a backup facility, not a list of different places to look. +.new The &%quote_mysql%&, &%quote_pgsql%&, and &%quote_oracle%& expansion operators convert newline, tab, carriage return, and backspace to \n, \t, \r, and \b respectively, and the characters single-quote, double-quote, and backslash -itself are escaped with backslashes. The &%quote_pgsql%& expansion operator, in -addition, escapes the percent and underscore characters. This cannot be done -for MySQL because these escapes are not recognized in contexts where these -characters are not special. +itself are escaped with backslashes. +.wen .section "Specifying the server in the query" "SECTspeserque" For MySQL and PostgreSQL lookups (but not currently for Oracle and InterBase), @@ -7473,13 +7592,17 @@ ${lookup pgsql{servers=master/db/name/pw; UPDATE ...} } .section "Special MySQL features" "SECID73" For MySQL, an empty host name or the use of &"localhost"& in &%mysql_servers%& causes a connection to the server on the local host by means of a Unix domain -socket. An alternate socket can be specified in parentheses. The full syntax of -each item in &%mysql_servers%& is: +socket. An alternate socket can be specified in parentheses. +.new +An option group name for MySQL option files can be specified in square brackets; +the default value is &"exim"&. +.wen +The full syntax of each item in &%mysql_servers%& is: .display -<&'hostname'&>::<&'port'&>(<&'socket name'&>)/<&'database'&>/&&& - <&'user'&>/<&'password'&> +<&'hostname'&>::<&'port'&>(<&'socket name'&>)[<&'option group'&>]/&&& + <&'database'&>/<&'user'&>/<&'password'&> .endd -Any of the three sub-parts of the first field can be omitted. For normal use on +Any of the four sub-parts of the first field can be omitted. For normal use on the local host it can be left blank or set to just &"localhost"&. No database need be supplied &-- but if it is absent here, it must be given in @@ -7560,6 +7683,10 @@ host, email address, or local part, respectively. In the sections below, the different types of pattern for each case are described, but first we cover some general facilities that apply to all four kinds of list. +Note that other parts of Exim use a &'string list'& which does not +support all the complexity available in +domain, host, address and local part lists. + .section "Expansion of lists" "SECID75" @@ -8298,7 +8425,13 @@ Both &`+include_unknown`& and &`+ignore_unknown`& may appear in the same list. The effect of each one lasts until the next, or until the end of the list. -To explain the host/ip processing logic a different way for the same ACL: +.section "Mixing wildcarded host names and addresses in host lists" &&& + "SECTmixwilhos" +.cindex "host list" "mixing names and addresses in" + +This section explains the host/ip processing logic with the same concepts +as the previous section, but specifically addresses what happens when a +wildcarded hostname is one of the items in the hostlist. .ilist If you have name lookups or wildcarded host names and @@ -8329,7 +8462,6 @@ this section. .endlist - .section "Temporary DNS errors when looking up host information" &&& "SECTtemdnserr" .cindex "host" "lookup failures, temporary" @@ -8337,7 +8469,7 @@ this section. .cindex "&`+ignore_defer`&" A temporary DNS lookup failure normally causes a defer action (except when &%dns_again_means_nonexist%& converts it into a permanent error). However, -host lists can include &`+ignore_defer`& and &`+include_defer`&, analagous to +host lists can include &`+ignore_defer`& and &`+include_defer`&, analogous to &`+ignore_unknown`& and &`+include_unknown`&, as described in the previous section. These options should be used with care, probably only in non-critical host lists such as whitelists. @@ -8399,33 +8531,6 @@ See section &<>&.) -.section "Mixing wildcarded host names and addresses in host lists" &&& - "SECTmixwilhos" -.cindex "host list" "mixing names and addresses in" -If you have name lookups or wildcarded host names and IP addresses in the same -host list, you should normally put the IP addresses first. For example, in an -ACL you could have: -.code -accept hosts = 10.9.8.7 : *.friend.example -.endd -The reason for this lies in the left-to-right way that Exim processes lists. -It can test IP addresses without doing any DNS lookups, but when it reaches an -item that requires a host name, it fails if it cannot find a host name to -compare with the pattern. If the above list is given in the opposite order, the -&%accept%& statement fails for a host whose name cannot be found, even if its -IP address is 10.9.8.7. - -If you really do want to do the name check first, and still recognize the IP -address, you can rewrite the ACL like this: -.code -accept hosts = *.friend.example -accept hosts = 10.9.8.7 -.endd -If the first &%accept%& fails, Exim goes on to try the second one. See chapter -&<>& for details of ACLs. - - - .section "Address lists" "SECTaddresslist" @@ -8849,6 +8954,71 @@ the expansion result is an empty string. If the ACL returns defer the result is a forced-fail. Otherwise the expansion fails. +.vitem "&*${certextract{*&<&'field'&>&*}{*&<&'certificate'&>&*}&&& + {*&<&'string2'&>&*}{*&<&'string3'&>&*}}*&" +.cindex "expansion" "extracting cerificate fields" +.cindex "&%certextract%&" "certificate fields" +.cindex "certificate" "extracting fields" +The <&'certificate'&> must be a variable of type certificate. +The field name is expanded and used to retrieve the relevant field from +the certificate. Supported fields are: +.display +&`version `& +&`serial_number `& +&`subject `& RFC4514 DN +&`issuer `& RFC4514 DN +&`notbefore `& time +&`notafter `& time +&`sig_algorithm `& +&`signature `& +&`subj_altname `& tagged list +&`ocsp_uri `& list +&`crl_uri `& list +.endd +If the field is found, +<&'string2'&> is expanded, and replaces the whole item; +otherwise <&'string3'&> is used. During the expansion of <&'string2'&> the +variable &$value$& contains the value that has been extracted. Afterwards, it +is restored to any previous value it might have had. + +If {<&'string3'&>} is omitted, the item is replaced by an empty string if the +key is not found. If {<&'string2'&>} is also omitted, the value that was +extracted is used. + +Some field names take optional modifiers, appended and separated by commas. + +The field selectors marked as "RFC4514" above +output a Distinguished Name string which is +not quite +parseable by Exim as a comma-separated tagged list +(the exceptions being elements containing commas). +RDN elements of a single type may be selected by +a modifier of the type label; if so the expansion +result is a list (newline-separated by default). +The separator may be changed by another modifier of +a right angle-bracket followed immediately by the new separator. +Recognised RDN type labels include "CN", "O", "OU" and "DC". + +The field selectors marked as "time" above +take an optional modifier of "int" +for which the result is the number of seconds since epoch. +Otherwise the result is a human-readable string +in the timezone selected by the main "timezone" option. + +The field selectors marked as "list" above return a list, +newline-separated by default, +(embedded separator characters in elements are doubled). +The separator may be changed by a modifier of +a right angle-bracket followed immediately by the new separator. + +The field selectors marked as "tagged" above +prefix each list element with a type string and an equals sign. +Elements of only one type may be selected by a modifier +which is one of "dns", "uri" or "mail"; +if so the element tags are omitted. + +If not otherwise noted field values are presented in human-readable form. + .vitem "&*${dlfunc{*&<&'file'&>&*}{*&<&'function'&>&*}{*&<&'arg'&>&*}&&& {*&<&'arg'&>&*}...}*&" .cindex &%dlfunc%& @@ -8887,6 +9057,30 @@ When compiling a function that is to be used in this way with gcc, you need to add &%-shared%& to the gcc command. Also, in the Exim build-time configuration, you must add &%-export-dynamic%& to EXTRALIBS. + +.vitem "&*${env{*&<&'key'&>&*}{*&<&'string1'&>&*}{*&<&'string2'&>&*}}*&" +.cindex "expansion" "extracting value from environment" +.cindex "environment" "value from" +The key is first expanded separately, and leading and trailing white space +removed. +This is then searched for as a name in the environment. +If a variable is found then its value is placed in &$value$& +and <&'string1'&> is expanded, otherwise <&'string2'&> is expanded. + +Instead of {<&'string2'&>} the word &"fail"& (not in curly brackets) can +appear, for example: +.code +${env{USER}{$value} fail } +.endd +This forces an expansion failure (see section &<>&); +{<&'string1'&>} must be present for &"fail"& to be recognized. + +If {<&'string2'&>} is omitted an empty string is substituted on +search failure. +If {<&'string1'&>} is omitted the search result is substituted on +search success. + + .vitem "&*${extract{*&<&'key'&>&*}{*&<&'string1'&>&*}{*&<&'string2'&>&*}&&& {*&<&'string3'&>&*}}*&" .cindex "expansion" "extracting substrings by key" @@ -9086,10 +9280,11 @@ by earlier ACLs are visible. Upper case and lower case letters are synonymous in header names. If the following character is white space, the terminating colon may be omitted, but this is not recommended, because you may then forget it when it is needed. When -white space terminates the header name, it is included in the expanded string. -If the message does not contain the given header, the expansion item is -replaced by an empty string. (See the &%def%& condition in section -&<>& for a means of testing for the existence of a header.) +white space terminates the header name, this white space is included in the +expanded string. If the message does not contain the given header, the +expansion item is replaced by an empty string. (See the &%def%& condition in +section &<>& for a means of testing for the existence of a +header.) If there is more than one header with the same name, they are all concatenated to form the substitution string, up to a maximum length of 64K. Unless @@ -9211,7 +9406,7 @@ yields &"42"&, and .code ${listextract{-3}{<, x,42,99,& Mailer,,/bin/bash}{result: $value}} .endd -yields &"result: 99"&. +yields &"result: 42"&. If {<&'string3'&>} is omitted, an empty string is used for string3. If {<&'string2'&>} is also omitted, the value that was @@ -9400,7 +9595,7 @@ locks out the use of this expansion item in filter files. .cindex "expansion" "inserting from a socket" .cindex "socket, use of in expansion" .cindex "&%readsocket%& expansion item" -This item inserts data from a Unix domain or Internet socket into the expanded +This item inserts data from a Unix domain or TCP socket into the expanded string. The minimal way of using it uses just two arguments, as in these examples: .code @@ -9496,11 +9691,23 @@ expansion item above. {*&<&'string2'&>&*}}*&" .cindex "expansion" "running a command" .cindex "&%run%& expansion item" -The command and its arguments are first expanded separately, and then the -command is run in a separate process, but under the same uid and gid. As in -other command executions from Exim, a shell is not used by default. If you want +The command and its arguments are first expanded as one string. The string is +split apart into individual arguments by spaces, and then the command is run +in a separate process, but under the same uid and gid. As in other command +executions from Exim, a shell is not used by default. If the command requires a shell, you must explicitly code it. +Since the arguments are split by spaces, when there is a variable expansion +which has an empty result, it will cause the situation that the argument will +simply be omitted when the program is actually executed by Exim. If the +script/program requires a specific number of arguments and the expanded +variable could possibly result in this empty expansion, the variable must be +quoted. This is more difficult if the expanded variable itself could result +in a string containing quotes, because it would interfere with the quotes +around the command arguments. A possible guard against this is to wrap the +variable in the &%sg%& operator to change any quote marks to some other +character. + The standard input for the command exists, but is empty. The standard output and standard error are set to the same file descriptor. .cindex "return code" "from &%run%& expansion" @@ -9579,6 +9786,36 @@ the regular expression from string expansion. +.vitem &*${sort{*&<&'string'&>&*}{*&<&'comparator'&>&*}{*&<&'extractor'&>&*}}*& +.cindex sorting "a list" +.cindex list sorting +.cindex expansion "list sorting" +After expansion, <&'string'&> is interpreted as a list, colon-separated by +default, but the separator can be changed in the usual way. +The <&'comparator'&> argument is interpreted as the operator +of a two-argument expansion condition. +The numeric operators plus ge, gt, le, lt (and ~i variants) are supported. +The comparison should return true when applied to two values +if the first value should sort before the second value. +The <&'extractor'&> expansion is applied repeatedly to elements of the list, +the element being placed in &$item$&, +to give values for comparison. + +The item result is a sorted list, +with the original list separator, +of the list elements (in full) of the original. + +Examples: +.code +${sort{3:2:1:4}{<}{$item}} +.endd +sorts a list of numbers, and +.code +${sort {${lookup dnsdb{>:,,mx=example.com}}} {<} {${listextract{1}{<,$item}}}} +.endd +will sort an MX lookup into priority order. + + .vitem &*${substr{*&<&'string1'&>&*}{*&<&'string2'&>&*}{*&<&'string3'&>&*}}*& .cindex "&%substr%& expansion item" .cindex "substring extraction" @@ -9694,7 +9931,7 @@ processing lists. To clarify "list of addresses in RFC 2822 format" mentioned above, Exim follows a strict interpretation of header line formatting. Exim parses the bare, unquoted portion of an email address and if it finds a comma, treats it as an -email address seperator. For the example header line: +email address separator. For the example header line: .code From: =?iso-8859-2?Q?Last=2C_First?= .endd @@ -9878,6 +10115,27 @@ as is, and other byte values are converted to &`\xNN`&, for example a byte value 127 is converted to &`\x7f`&. +.new +.vitem &*${ipv6denorm:*&<&'string'&>&*}*& +.cindex "&%ipv6denorm%& expansion item" +.cindex "IP address" normalisation +This expands an IPv6 address to a full eight-element colon-separated set +of hex digits including leading zeroes. +A trailing ipv4-style dotted-decimal set is converted to hex. +Pure IPv4 addresses are converted to IPv4-mapped IPv6. + +.vitem &*${ipv6norm:*&<&'string'&>&*}*& +.cindex "&%ipv6norm%& expansion item" +.cindex "IP address" normalisation +.cindex "IP address" "canonical form" +This converts an IPv6 address to canonical form. +Leading zeroes of groups are omitted, and the longest +set of zero-valued groups is replaced with a double colon. +A trailing ipv4-style dotted-decimal set is converted to hex. +Pure IPv4 addresses are converted to IPv4-mapped IPv6. +.wen + + .vitem &*${lc:*&<&'string'&>&*}*& .cindex "case forcing in strings" .cindex "string" "case forcing" @@ -9961,6 +10219,7 @@ Letters in IPv6 addresses are always output in lower case. .vitem &*${md5:*&<&'string'&>&*}*& .cindex "MD5 hash" .cindex "expansion" "MD5 hash" +.cindex "certificate fingerprint" .cindex "&%md5%& expansion item" The &%md5%& operator computes the MD5 hash value of the string, and returns it as a 32-digit hexadecimal number, in which any letters are in lower case. @@ -10039,7 +10298,7 @@ random(). .vitem &*${reverse_ip:*&<&'ipaddr'&>&*}*& .cindex "expansion" "IP address" This operator reverses an IP address; for IPv4 addresses, the result is in -dotted-quad decimal form, while for IPv6 addreses the result is in +dotted-quad decimal form, while for IPv6 addresses the result is in dotted-nibble hexadecimal form. In both cases, this is the "natural" form for DNS. For example, .code @@ -10098,11 +10357,24 @@ variables or headers inside regular expressions. .vitem &*${sha1:*&<&'string'&>&*}*& .cindex "SHA-1 hash" .cindex "expansion" "SHA-1 hashing" +.cindex "certificate fingerprint" .cindex "&%sha2%& expansion item" The &%sha1%& operator computes the SHA-1 hash value of the string, and returns it as a 40-digit hexadecimal number, in which any letters are in upper case. +.vitem &*${sha256:*&<&'certificate'&>&*}*& +.cindex "SHA-256 hash" +.cindex "certificate fingerprint" +.cindex "expansion" "SHA-256 hashing" +.cindex "&%sha256%& expansion item" +The &%sha256%& operator computes the SHA-256 hash fingerprint of the +certificate, +and returns +it as a 64-digit hexadecimal number, in which any letters are in upper case. +Only arguments which are a single variable of certificate type are supported. + + .vitem &*${stat:*&<&'string'&>&*}*& .cindex "expansion" "statting a file" .cindex "file" "extracting characteristics" @@ -10171,6 +10443,14 @@ number of larger units and output in Exim's normal time format, for example, .cindex "expansion" "case forcing" .cindex "&%uc%& expansion item" This forces the letters in the string into upper-case. + +.vitem &*${utf8clean:*&<&'string'&>&*}*& +.cindex "correction of invalid utf-8 sequences in strings" +.cindex "utf-8" "utf-8 sequences" +.cindex "incorrect utf-8" +.cindex "expansion" "utf-8 forcing" +.cindex "&%utf8clean%& expansion item" +This replaces any invalid utf-8 sequence in the string by the character &`?`&. .endlist @@ -10239,7 +10519,7 @@ If the ACL returns defer the result is a forced-fail. .cindex "&%bool%& expansion condition" This condition turns a string holding a true or false representation into a boolean state. It parses &"true"&, &"false"&, &"yes"& and &"no"& -(case-insensitively); also positive integer numbers map to true if non-zero, +(case-insensitively); also integer numbers map to true if non-zero, false if zero. An empty string is treated as false. Leading and trailing whitespace is ignored; @@ -10867,13 +11147,19 @@ support for TLS or the content scanning extension. When a &%match%& expansion condition succeeds, these variables contain the captured substrings identified by the regular expression during subsequent processing of the success string of the containing &%if%& expansion item. -However, they do not retain their values afterwards; in fact, their previous +In the expansion condition case +they do not retain their values afterwards; in fact, their previous values are restored at the end of processing an &%if%& item. The numerical variables may also be set externally by some other matching process which precedes the expansion of the string. For example, the commands available in Exim filter files include an &%if%& command with its own regular expression matching condition. +.vitem "&$acl_arg1$&, &$acl_arg2$&, etc" +Within an acl condition, expansion condition or expansion item +any arguments are copied to these variables, +any unused variables being made empty. + .vitem "&$acl_c...$&" Values can be placed in these variables by the &%set%& modifier in an ACL. They can be given any name that starts with &$acl_c$& and is at least six characters @@ -10895,6 +11181,10 @@ message is received, the values of these variables are saved with the message, and can be accessed by filters, routers, and transports during subsequent delivery. +.vitem &$acl_narg$& +Within an acl condition, expansion condition or expansion item +this variable has the number of arguments. + .vitem &$acl_verify_message$& .vindex "&$acl_verify_message$&" After an address verification has failed, this variable contains the failure @@ -11066,9 +11356,10 @@ not the same as the user id of the originator of a message (see &$originator_uid$&). If Exim re-execs itself, this variable in the new incarnation normally contains the Exim uid. -.vitem &$compile_date$& -.vindex "&$compile_date$&" -The date on which the Exim binary was compiled. +.vitem &$callout_address$& +.vindex "&$callout_address$&" +After a callout for verification, spamd or malware daemon service, the +address that was connected to. .vitem &$compile_number$& .vindex "&$compile_number$&" @@ -11076,6 +11367,17 @@ The building process for Exim keeps a count of the number of times it has been compiled. This serves to distinguish different compilations of the same version of the program. +.vitem &$config_dir$& +.vindex "&$config_dir$&" +The directory name of the main configuration file. That is, the content of +&$config_file$& with the last component stripped. The value does not +contain the trailing slash. If &$config_file$& does not contain a slash, +&$config_dir$& is ".". + +.vitem &$config_file$& +.vindex "&$config_file$&" +The name of the main configuration file Exim is using. + .vitem &$demime_errorlevel$& .vindex "&$demime_errorlevel$&" This variable is available when Exim is compiled with @@ -11088,6 +11390,34 @@ This variable is available when Exim is compiled with the content-scanning extension and the obsolete &%demime%& condition. For details, see section &<>&. +.vitem &$dkim_cur_signer$& &&& + &$dkim_verify_status$& &&& + &$dkim_verify_reason$& &&& + &$dkim_domain$& &&& + &$dkim_identity$& &&& + &$dkim_selector$& &&& + &$dkim_algo$& &&& + &$dkim_canon_body$& &&& + &$dkim_canon_headers$& &&& + &$dkim_copiedheaders$& &&& + &$dkim_bodylength$& &&& + &$dkim_created$& &&& + &$dkim_expires$& &&& + &$dkim_headernames$& &&& + &$dkim_key_testing$& &&& + &$dkim_key_nosubdomains$& &&& + &$dkim_key_srvtype$& &&& + &$dkim_key_granularity$& &&& + &$dkim_key_notes$& +These variables are only available within the DKIM ACL. +For details see chapter &<>&. + +.vitem &$dkim_signers$& +.vindex &$dkim_signers$& +When a message has been received this variable contains +a colon-separated list of signer domains and identities for the message. +For details see chapter &<>&. + .vitem &$dnslist_domain$& &&& &$dnslist_matched$& &&& &$dnslist_text$& &&& @@ -11183,6 +11513,13 @@ This variable contains the path to the Exim binary. .vindex "&$exim_uid$&" This variable contains the numerical value of the Exim user id. +.vitem &$exim_version$& +.vindex "&$exim_version$&" +This variable contains the version string of the Exim build. +The first character is a major version number, currently 4. +Then after a dot, the next group of digits is a minor version number. +There may be other characters following the minor version. + .vitem &$found_extension$& .vindex "&$found_extension$&" This variable is available when Exim is compiled with the @@ -11281,6 +11618,11 @@ the result, the name is not accepted, and &$host_lookup_deferred$& is set to .vindex "&$host_lookup_failed$&" See &$host_lookup_deferred$&. +.vitem &$host_port$& +.vindex "&$host_port$&" +This variable is set to the remote host's TCP port whenever &$host$& is set +for an outbound connection. + .vitem &$inode$& .vindex "&$inode$&" @@ -11433,6 +11775,18 @@ ability to find the amount of free space (only true for experimental systems), the space value is -1. See also the &%check_log_space%& option. +.vitem &$lookup_dnssec_authenticated$& +.vindex "&$lookup_dnssec_authenticated$&" +This variable is set after a DNS lookup done by +a dnsdb lookup expansion, dnslookup router or smtp transport. +.cindex "DNS" "DNSSEC" +It will be empty if &(DNSSEC)& was not requested, +&"no"& if the result was not labelled as authenticated data +and &"yes"& if it was. +Results that are labelled as authoritative answer that match +the &%dns_trust_aa%& configuration variable count also +as authenticated data. + .vitem &$mailstore_basename$& .vindex "&$mailstore_basename$&" This variable is set only when doing deliveries in &"mailstore"& format in the @@ -11519,7 +11873,7 @@ This variable is like &$message_headers$& except that no processing of the contents of header lines is done. .vitem &$message_id$& -This is an old name for &$message_exim_id$&, which is now deprecated. +This is an old name for &$message_exim_id$&. It is now deprecated. .vitem &$message_linecount$& .vindex "&$message_linecount$&" @@ -11664,6 +12018,13 @@ a single-component name, Exim calls &[gethostbyname()]& (or qualified host name. See also &$smtp_active_hostname$&. +.new +.vitem &$prdr_requested$& +.cindex "PRDR" "variable for" +This variable is set to &"yes"& if PRDR was requested by the client for the +current message, otherwise &"no"&. +.wen + .vitem &$prvscheck_address$& This variable is used in conjunction with the &%prvscheck%& expansion item, which is described in sections &<>& and @@ -11736,10 +12097,7 @@ on which interface and/or port is being used for the incoming connection. The values of &$received_ip_address$& and &$received_port$& are saved with any messages that are received, thus making these variables available at delivery time. - -&*Note:*& There are no equivalent variables for outgoing connections, because -the values are unknown (unless they are explicitly set by options of the -&(smtp)& transport). +For outbound connections see &$sending_ip_address$&. .vitem &$received_port$& .vindex "&$received_port$&" @@ -11845,6 +12203,12 @@ increases for each accepted recipient. It can be referenced in an ACL. This variable is set to contain the matching regular expression after a &%regex%& ACL condition has matched (see section &<>&). +.vitem "&$regex1$&, &$regex2$&, etc" +.cindex "regex submatch variables (&$1regex$& &$2regex$& etc)" +When a &%regex%& or &%mime_regex%& ACL condition succeeds, +these variables contain the +captured substrings identified by the regular expression. + .vitem &$reply_address$& .vindex "&$reply_address$&" @@ -11949,6 +12313,12 @@ verification either failed or was not requested. A host name in parentheses is the argument of a HELO or EHLO command. This is omitted if it is identical to the verified host name or to the host's IP address in square brackets. +.vitem &$sender_helo_dnssec$& +.vindex "&$sender_helo_dnssec$&" +This boolean variable is true if a successful HELO verification was +.cindex "DNS" "DNSSEC" +done using DNS information the resolver library stated was authenticated data. + .vitem &$sender_helo_name$& .vindex "&$sender_helo_name$&" When a message is received from a remote host that has issued a HELO or EHLO @@ -11958,8 +12328,9 @@ the &%-bs%& or &%-bS%& options. .vitem &$sender_host_address$& .vindex "&$sender_host_address$&" -When a message is received from a remote host, this variable contains that -host's IP address. For locally submitted messages, it is empty. +When a message is received from a remote host using SMTP, +this variable contains that +host's IP address. For locally non-SMTP submitted messages, it is empty. .vitem &$sender_host_authenticated$& .vindex "&$sender_host_authenticated$&" @@ -11970,11 +12341,14 @@ received. It is empty if there was no successful authentication. See also .vitem &$sender_host_dnssec$& .vindex "&$sender_host_dnssec$&" -If &$sender_host_name$& has been populated (by reference, &%hosts_lookup%& or +If an attempt to populate &$sender_host_name$& has been made +(by reference, &%hosts_lookup%& or otherwise) then this boolean will have been set true if, and only if, the -resolver library states that the reverse DNS was authenticated data. At all +resolver library states that both +the reverse and forward DNS were authenticated data. At all other times, this variable is false. +.cindex "DNS" "DNSSEC" It is likely that you will need to coerce DNSSEC support on in the resolver library, by setting: .code @@ -11982,10 +12356,7 @@ dns_dnssec_ok = 1 .endd Exim does not perform DNSSEC validation itself, instead leaving that to a -validating resolver (eg, unbound, or bind with suitable configuration). - -Exim does not (currently) check to see if the forward DNS was also secured -with DNSSEC, only the reverse DNS. +validating resolver (e.g. unbound, or bind with suitable configuration). If you have changed &%host_lookup_order%& so that &`bydns`& is not the first mechanism in the list, then this variable will be false. @@ -12209,12 +12580,46 @@ on an outbound SMTP connection; the meaning of this depends upon the TLS implementation used. If TLS has not been negotiated, the value will be 0. +.vitem &$tls_in_ourcert$& +.vindex "&$tls_in_ourcert$&" +This variable refers to the certificate presented to the peer of an +inbound connection when the message was received. +It is only useful as the argument of a +&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator, +or a &%def%& condition. + +.vitem &$tls_in_peercert$& +.vindex "&$tls_in_peercert$&" +This variable refers to the certificate presented by the peer of an +inbound connection when the message was received. +It is only useful as the argument of a +&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator, +or a &%def%& condition. +If certificate verification fails it may refer to a failing chain element +which is not the leaf. + +.vitem &$tls_out_ourcert$& +.vindex "&$tls_out_ourcert$&" +This variable refers to the certificate presented to the peer of an +outbound connection. It is only useful as the argument of a +&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator, +or a &%def%& condition. + +.vitem &$tls_out_peercert$& +.vindex "&$tls_out_peercert$&" +This variable refers to the certificate presented by the peer of an +outbound connection. It is only useful as the argument of a +&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator, +or a &%def%& condition. +If certificate verification fails it may refer to a failing chain element +which is not the leaf. + .vitem &$tls_in_certificate_verified$& .vindex "&$tls_in_certificate_verified$&" This variable is set to &"1"& if a TLS certificate was verified when the message was received, and &"0"& otherwise. -The deprecated &$tls_certificate_verfied$& variable refers to the inbound side +The deprecated &$tls_certificate_verified$& variable refers to the inbound side except when used in the context of an outbound SMTP delivery, when it refers to the outbound. @@ -12246,6 +12651,24 @@ and then set to the outgoing cipher suite if one is negotiated. See chapter &<>& for details of TLS support and chapter &<>& for details of the &(smtp)& transport. +.vitem &$tls_in_ocsp$& +.vindex "&$tls_in_ocsp$&" +When a message is received from a remote client connection +the result of any OCSP request from the client is encoded in this variable: +.code +0 OCSP proof was not requested (default value) +1 No response to request +2 Response not verified +3 Verification failed +4 Verification succeeded +.endd + +.vitem &$tls_out_ocsp$& +.vindex "&$tls_out_ocsp$&" +When a message is sent to a remote host connection +the result of any OCSP request made is encoded in this variable. +See &$tls_in_ocsp$& for values. + .vitem &$tls_in_peerdn$& .vindex "&$tls_in_peerdn$&" .vindex "&$tls_peerdn$&" @@ -12253,6 +12676,8 @@ When a message is received from a remote host over an encrypted SMTP connection, and Exim is configured to request a certificate from the client, the value of the Distinguished Name of the certificate is made available in the &$tls_in_peerdn$& during subsequent processing. +If certificate verification fails it may refer to a failing chain element +which is not the leaf. The deprecated &$tls_peerdn$& variable refers to the inbound side except when used in the context of an outbound SMTP delivery, when it refers to @@ -12264,6 +12689,8 @@ When a message is being delivered to a remote host over an encrypted SMTP connection, and Exim is configured to request a certificate from the server, the value of the Distinguished Name of the certificate is made available in the &$tls_out_peerdn$& during subsequent processing. +If certificate verification fails it may refer to a failing chain element +which is not the leaf. .vitem &$tls_in_sni$& .vindex "&$tls_in_sni$&" @@ -12341,6 +12768,13 @@ This variable contains the result of an expansion lookup, extraction operation, or external command, as described above. It is also used during a &*reduce*& expansion. +.vitem &$verify_mode$& +.vindex "&$verify_mode$&" +While a router or transport is being run in verify mode +or for cutthrough delivery, +contains "S" for sender-verification or "R" for recipient-verification. +Otherwise, empty. + .vitem &$version_number$& .vindex "&$version_number$&" The version number of Exim. @@ -12552,8 +12986,9 @@ option), the interfaces and ports on which it listens are controlled by the following options: .ilist -&%daemon_smtp_ports%& contains a list of default ports. (For backward -compatibility, this option can also be specified in the singular.) +&%daemon_smtp_ports%& contains a list of default ports +or service names. +(For backward compatibility, this option can also be specified in the singular.) .next &%local_interfaces%& contains list of interface IP addresses on which to listen. Each item may optionally also specify a port. @@ -12654,7 +13089,8 @@ value of &%daemon_smtp_ports%& is no longer relevant in this example.) Exim supports the obsolete SSMTP protocol (also known as SMTPS) that was used before the STARTTLS command was standardized for SMTP. Some legacy clients still use this protocol. If the &%tls_on_connect_ports%& option is set to a -list of port numbers, connections to those ports must use SSMTP. The most +list of port numbers or service names, +connections to those ports must use SSMTP. The most common use of this option is expected to be .code tls_on_connect_ports = 465 @@ -12885,6 +13321,7 @@ listed in more than one group. .row &%message_logs%& "create per-message logs" .row &%preserve_message_logs%& "after message completion" .row &%process_log_path%& "for SIGUSR1 and &'exiwhat'&" +.row &%slow_lookup_log%& "control logging of slow DNS lookups" .row &%syslog_duplication%& "controls duplicate log lines on syslog" .row &%syslog_facility%& "set syslog &""facility""& field" .row &%syslog_processname%& "set syslog &""ident""& field" @@ -12990,6 +13427,7 @@ listed in more than one group. .row &%acl_smtp_auth%& "ACL for AUTH" .row &%acl_smtp_connect%& "ACL for connection" .row &%acl_smtp_data%& "ACL for DATA" +.row &%acl_smtp_data_prdr%& "ACL for DATA, per-recipient" .row &%acl_smtp_dkim%& "ACL for DKIM verification" .row &%acl_smtp_etrn%& "ACL for ETRN" .row &%acl_smtp_expn%& "ACL for EXPN" @@ -12997,6 +13435,7 @@ listed in more than one group. .row &%acl_smtp_mail%& "ACL for MAIL" .row &%acl_smtp_mailauth%& "ACL for AUTH on MAIL command" .row &%acl_smtp_mime%& "ACL for MIME parts" +.row &%acl_smtp_notquit%& "ACL for non-QUIT terminations" .row &%acl_smtp_predata%& "ACL for start of data" .row &%acl_smtp_quit%& "ACL for QUIT" .row &%acl_smtp_rcpt%& "ACL for RCPT" @@ -13050,6 +13489,8 @@ listed in more than one group. .row &%tls_crl%& "certificate revocation list" .row &%tls_dh_max_bits%& "clamp D-H bit count suggestion" .row &%tls_dhparam%& "DH parameters for server" +.row &%tls_eccurve%& "EC curve selection for server" +.row &%tls_ocsp_file%& "location of server certificate status proof" .row &%tls_on_connect_ports%& "specify SSMTP (SMTPS) ports" .row &%tls_privatekey%& "location of server private key" .row &%tls_remember_esmtp%& "don't reset after starting TLS" @@ -13103,6 +13544,7 @@ listed in more than one group. See also the &'Policy controls'& section above. .table2 +.row &%dkim_verify_signers%& "DKIM domain for which DKIM ACL is run" .row &%host_lookup%& "host name looked up for these hosts" .row &%host_lookup_order%& "order of DNS and local name lookups" .row &%recipient_unqualified_hosts%& "may send unqualified recipients" @@ -13142,9 +13584,11 @@ See also the &'Policy controls'& section above. .table2 .row &%accept_8bitmime%& "advertise 8BITMIME" .row &%auth_advertise_hosts%& "advertise AUTH to these hosts" +.row &%dsn_advertise_hosts%& "advertise DSN extensions to these hosts" .row &%ignore_fromline_hosts%& "allow &""From ""& from these hosts" .row &%ignore_fromline_local%& "allow &""From ""& from local SMTP" .row &%pipelining_advertise_hosts%& "advertise pipelining to these hosts" +.row &%prdr_enable%& "advertise PRDR to all hosts" .row &%tls_advertise_hosts%& "advertise TLS to these hosts" .endtable @@ -13194,6 +13638,7 @@ See also the &'Policy controls'& section above. .row &%dns_ipv4_lookup%& "only v4 lookup for these domains" .row &%dns_retrans%& "parameter for resolver" .row &%dns_retry%& "parameter for resolver" +.row &%dns_trust_aa%& "DNS zones trusted as authentic" .row &%dns_use_edns0%& "parameter for resolver" .row &%hold_domains%& "hold delivery for these domains" .row &%local_interfaces%& "for routing checks" @@ -13296,6 +13741,23 @@ This option defines the ACL that is run after an SMTP DATA command has been processed and the message itself has been received, but before the final acknowledgment is sent. See chapter &<>& for further details. +.option acl_smtp_data_prdr main string&!! accept +.cindex "PRDR" "ACL for" +.cindex "DATA" "PRDR ACL for" +.cindex "&ACL;" "PRDR-related" +.cindex "&ACL;" "per-user data processing" +This option defines the ACL that, +if the PRDR feature has been negotiated, +is run for each recipient after an SMTP DATA command has been +processed and the message itself has been received, but before the +acknowledgment is sent. See chapter &<>& for further details. + +.option acl_smtp_dkim main string&!! unset +.cindex DKIM "ACL for" +This option defines the ACL that is run for each DKIM signature +of a received message. +See chapter &<>& for further details. + .option acl_smtp_etrn main string&!! unset .cindex "ETRN" "ACL for" This option defines the ACL that is run when an SMTP ETRN command is @@ -13330,6 +13792,12 @@ This option is available when Exim is built with the content-scanning extension. It defines the ACL that is run for each MIME part in a message. See section &<>& for details. +.option acl_smtp_notquit main string&!! unset +.cindex "not-QUIT, ACL for" +This option defines the ACL that is run when an SMTP session +ends without a QUIT command being received. +See chapter &<>& for further details. + .option acl_smtp_predata main string&!! unset This option defines the ACL that is run when an SMTP DATA command is received, before the message itself is received. See chapter &<>& for @@ -13386,7 +13854,7 @@ the local host's IP addresses. It appears that more and more DNS zone administrators are breaking the rules and putting domain names that look like IP addresses on the right hand side of MX records. Exim follows the rules and rejects this, giving an error message -that explains the mis-configuration. However, some other MTAs support this +that explains the misconfiguration. However, some other MTAs support this practice, so to avoid &"Why can't Exim do this?"& complaints, &%allow_mx_to_ip%& exists, in order to enable this heinous activity. It is not recommended, except when you have no other choice. @@ -13765,6 +14233,14 @@ etc. are ignored. If IP literals are enabled, the &(ipliteral)& router declines to handle IPv6 literal addresses. +.option dkim_verify_signers main "domain list&!!" $dkim_signers +.cindex DKIM "controlling calls to the ACL" +This option gives a list of DKIM domains for which the DKIM ACL is run. +It is expanded after the message is received; by default it runs +the ACL once for each signature in the message. +See chapter &<>&. + + .option dns_again_means_nonexist main "domain list&!!" unset .cindex "DNS" "&""try again""& response; overriding" DNS lookups give a &"try again"& response for the DNS errors @@ -13840,6 +14316,8 @@ servers have all been upgraded, there should be no need for this option. .option dns_retrans main time 0s .cindex "DNS" "resolver options" +.cindex timeout "dns lookup" +.cindex "DNS" timeout The options &%dns_retrans%& and &%dns_retry%& can be used to set the retransmission and retry parameters for DNS lookups. Values of zero (the defaults) leave the system default settings unchanged. The first value is the @@ -13849,12 +14327,39 @@ take. I haven't found any documentation about timeouts on DNS lookups; these parameter values are available in the external resolver interface structure, but nowhere does it seem to describe how they are used or what you might want to set in them. +See also the &%slow_lookup_log%& option. .option dns_retry main integer 0 See &%dns_retrans%& above. +.option dns_trust_aa main "domain list&!!" unset +.cindex "DNS" "resolver options" +.cindex "DNS" "DNSSEC" +If this option is set then lookup results marked with the AA bit +(Authoritative Answer) are trusted the same way as if they were +DNSSEC-verified. The authority section's name of the answer must +match with this expanded domain list. + +Use this option only if you talk directly to a resolver that is +authoritative for some zones and does not set the AD (Authentic Data) +bit in the answer. Some DNS servers may have an configuration option to +mark the answers from their own zones as verified (they set the AD bit). +Others do not have this option. It is considered as poor practice using +a resolver that is an authoritative server for some zones. + +Use this option only if you really have to (e.g. if you want +to use DANE for remote delivery to a server that is listed in the DNS +zones that your resolver is authoritative for). + +If the DNS answer packet has the AA bit set and contains resource record +in the answer section, the name of the first NS record appearing in the +authority section is compared against the list. If the answer packet is +authoritative but the answer section is empty, the name of the first SOA +record in the authoritative section is used instead. + +.cindex "DNS" "resolver options" .option dns_use_edns0 main integer -1 .cindex "DNS" "resolver options" .cindex "DNS" "EDNS0" @@ -13871,6 +14376,18 @@ This is an obsolete option that is now a no-op. It used to affect the way Exim handled CR and LF characters in incoming messages. What happens now is described in section &<>&. +.option dsn_advertise_hosts main "host list&!!" unset +.cindex "bounce messages" "success" +.cindex "DSN" "success" +.cindex "Delivery Status Notification" "success" +DSN extensions (RFC3461) will be advertised in the EHLO message to, +and accepted from, these hosts. +Hosts may use the NOTIFY and ENVID options on RCPT TO commands, +and RET and ORCPT options on MAIL FROM commands. +A NOTIFY=SUCCESS option requests success-DSN messages. +A NOTIFY= option with no argument requests that no delay or failure DSNs +are sent. + .option dsn_from main "string&!!" "see below" .cindex "&'From:'& header line" "in bounces" .cindex "bounce messages" "&'From:'& line, specifying" @@ -13888,7 +14405,7 @@ panic is logged, and the default value is used. Exim's transports have an option for adding an &'Envelope-to:'& header to a message when it is delivered, in exactly the same way as &'Return-path:'& is handled. &'Envelope-to:'& records the original recipient address from the -messages's envelope that caused the delivery to happen. Such headers should not +message's envelope that caused the delivery to happen. Such headers should not be present in incoming messages, and this option causes them to be removed at the time the message is received, to avoid any problems that might occur when a delivered message is subsequently sent on to some other recipient. @@ -13995,7 +14512,7 @@ routing, but which are not used for listening by the daemon. See section . Allow this long option name to split; give it unsplit as a fifth argument . for the automatic .oindex that is generated by .option. -.option "extract_addresses_remove_ &~&~arguments" main boolean true &&& +.option "extract_addresses_remove_arguments" main boolean true &&& extract_addresses_remove_arguments .oindex "&%-t%&" .cindex "command line" "addresses with &%-t%&" @@ -14179,14 +14696,17 @@ is an IP literal matching the calling address of the host, or matches the host name that Exim obtains by doing a reverse lookup of the calling host address, or .next -when looked up using &[gethostbyname()]& (or &[getipnodebyname()]& when -available) yields the calling host address. +when looked up in DNS yields the calling host address. .endlist However, the EHLO or HELO command is not rejected if any of the checks fail. Processing continues, but the result of the check is remembered, and can be detected later in an ACL by the &`verify = helo`& condition. +If DNS was used for successful verification, the variable +.cindex "DNS" "DNSSEC" +&$helo_verify_dnssec$& records the DNSSEC status of the lookups. + .option helo_verify_hosts main "host list&!!" unset .cindex "HELO verifying" "mandatory" .cindex "EHLO" "verifying, mandatory" @@ -14560,8 +15080,9 @@ section &<>&. This option sets the path which is used to determine the names of Exim's log files, or indicates that logging is to be to syslog, or both. It is expanded when Exim is entered, so it can, for example, contain a reference to the host -name. If no specific path is set for the log files at compile or run time, they -are written in a sub-directory called &_log_& in Exim's spool directory. +name. If no specific path is set for the log files at compile or run time, +or if the option is unset at run time (i.e. &`log_file_path = `&) +they are written in a sub-directory called &_log_& in Exim's spool directory. Chapter &<>& contains further details about Exim's logging, and section &<>& describes how the contents of &%log_file_path%& are used. If this string is fixed at your installation (contains no expansion @@ -14708,7 +15229,7 @@ If you use a virus-scanner and set this option to to a value larger than the maximum size that your virus-scanner is configured to support, you may get failures triggered by large mails. The right size to configure for the virus-scanner depends upon what data is passed and the options in use but it's -probably safest to just set it to a little larger than this value. Eg, with a +probably safest to just set it to a little larger than this value. E.g., with a default Exim message size of 50M and a default ClamAV StreamMaxLength of 10M, some problems may result. @@ -14788,16 +15309,21 @@ yourself in the foot in various unpleasant ways. This option should not be adjusted lightly. An unrecognised item will be detected at startup, by invoking Exim with the &%-bV%& flag. +The option affects Exim operating both as a server and as a client. + Historical note: prior to release 4.80, Exim defaulted this value to "+dont_insert_empty_fragments", which may still be needed for compatibility with some clients, but which lowers security by increasing exposure to some now infamous attacks. -An example: +Examples: .code # Make both old MS and old Eudora happy: openssl_options = -all +microsoft_big_sslv3_buffer \ +dont_insert_empty_fragments + +# Disable older protocol versions: +openssl_options = +no_sslv2 +no_sslv3 .endd Possible options may include: @@ -14938,6 +15464,15 @@ that clients will use it; &"out of order"& commands that are &"expected"& do not count as protocol errors (see &%smtp_max_synprot_errors%&). +.option prdr_enable main boolean false +.cindex "PRDR" "enabling on server" +This option can be used to enable the Per-Recipient Data Response extension +to SMTP, defined by Eric Hall. +If the option is set, PRDR is advertised by Exim when operating as a server. +If the client requests PRDR, and more than one recipient, for a message +an additional ACL is called for each recipient after the message content +is received. See section &<>&. + .option preserve_message_logs main boolean false .cindex "message logs" "preserving" If this option is set, message log files are not deleted when messages are @@ -15349,13 +15884,15 @@ the time of delivery. They are normally used only for final local deliveries. This option is an obsolete synonym for &%bounce_return_size_limit%&. -.option rfc1413_hosts main "host list&!!" * +.option rfc1413_hosts main "host list&!!" @[] .cindex "RFC 1413" .cindex "host" "for RFC 1413 calls" -RFC 1413 identification calls are made to any client host which matches an item -in the list. +RFC 1413 identification calls are made to any client host which matches +an item in the list. +The default value specifies just this host, being any local interface +for the system. -.option rfc1413_query_timeout main time 5s +.option rfc1413_query_timeout main time 0s .cindex "RFC 1413" "query timeout" .cindex "timeout" "for RFC 1413 call" This sets the timeout on RFC 1413 identification calls. If it is set to zero, @@ -15374,6 +15911,16 @@ it qualifies them only if the message came from a host that matches using TCP/IP), and the &%-bnq%& option was not set. +.option slow_lookup_log main integer 0 +.cindex "logging" "slow lookups" +.cindex "dns" "logging slow lookups" +This option controls logging of slow lookups. +If the value is nonzero it is taken as a number of milliseconds +and lookups taking longer than this are logged. +Currently this applies only to DNS lookups. + + + .option smtp_accept_keepalive main boolean true .cindex "keepalive" "on incoming connection" This option controls the setting of the SO_KEEPALIVE option on incoming @@ -15749,7 +16296,7 @@ See &%smtp_ratelimit_hosts%& above. See &%smtp_ratelimit_hosts%& above. -.option smtp_receive_timeout main time 5m +.option smtp_receive_timeout main time&!! 5m .cindex "timeout" "for SMTP input" .cindex "SMTP" "input timeout" This sets a timeout value for SMTP reception. It applies to all forms of SMTP @@ -15764,6 +16311,10 @@ SMTP data timeout on connection from... The former means that Exim was expecting to read an SMTP command; the latter means that it was in the DATA phase, reading the contents of a message. +If the first character of the option is a &"$"& the option is +expanded before use and may depend on +&$sender_host_name$&, &$sender_host_address$& and &$sender_host_port$&. + .oindex "&%-os%&" The value set by this option can be overridden by the @@ -16036,7 +16587,9 @@ runs. This is appropriate behaviour for obtaining wall-clock time on some, but unfortunately not all, operating systems. -.option tls_advertise_hosts main "host list&!!" unset +.new +.option tls_advertise_hosts main "host list&!!" * +.wen .cindex "TLS" "advertising" .cindex "encryption" "on SMTP connection" .cindex "SMTP" "encrypted connection" @@ -16044,6 +16597,11 @@ When Exim is built with support for TLS encrypted connections, the availability of the STARTTLS command to set up an encrypted session is advertised in response to EHLO only to those client hosts that match this option. See chapter &<>& for details of Exim's support for TLS. +.new +Note that the default value requires that a certificate be supplied +using the &%tls_certificate%& option. If no certificate is available then +the &%tls_advertise_hosts%& option should be set empty. +.wen .option tls_certificate main string&!! unset @@ -16149,7 +16707,35 @@ prior to the 4.80 release, as Debian used to patch Exim to raise the minimum acceptable bound from 1024 to 2048. +.option tls_eccurve main string&!! prime256v1 +.cindex TLS "EC cryptography" +If built with a recent-enough version of OpenSSL, +this option selects a EC curve for use by Exim. + +Curve names of the form &'prime256v1'& are accepted. +For even more-recent library versions, names of the form &'P-512'& +are also accepted, plus the special value &'auto'& +which tell the library to choose. + +If the option is set to an empty string, no EC curves will be enabled. + + +.option tls_ocsp_file main string&!! unset +.cindex TLS "certificate status" +.cindex TLS "OCSP proof file" +This option +must if set expand to the absolute path to a file which contains a current +status proof for the server's certificate, as obtained from the +Certificate Authority. + +.new +Usable for GnuTLS 3.4.4 or 3.3.17 or OpenSSL 1.1.0 (or later). +.wen + + .option tls_on_connect_ports main "string list" unset +.cindex SSMTP +.cindex SMTPS This option specifies a list of incoming SSMTP (aka SMTPS) ports that should operate the obsolete SSMTP (SMTPS) protocol, where a TLS session is immediately set up without waiting for the client to issue a STARTTLS command. For @@ -16196,22 +16782,35 @@ preference order of the available ciphers. Details are given in sections See &%tls_verify_hosts%& below. -.option tls_verify_certificates main string&!! unset +.option tls_verify_certificates main string&!! system .cindex "TLS" "client certificate verification" .cindex "certificate" "verification of client" -The value of this option is expanded, and must then be the absolute path to -a file containing permitted certificates for clients that -match &%tls_verify_hosts%& or &%tls_try_verify_hosts%&. Alternatively, if you -are using OpenSSL, you can set &%tls_verify_certificates%& to the name of a -directory containing certificate files. This does not work with GnuTLS; the -option must be set to the name of a single file if you are using GnuTLS. +The value of this option is expanded, and must then be either the +word "system" +or the absolute path to +a file or directory containing permitted certificates for clients that +match &%tls_verify_hosts%& or &%tls_try_verify_hosts%&. + +The "system" value for the option will use a +system default location compiled into the SSL library. +This is not available for GnuTLS versions preceding 3.0.20, +and will be taken as empty; an explicit location +must be specified. + +The use of a directory for the option value is not available for GnuTLS versions +preceding 3.3.6 and a single file must be used. + +With OpenSSL the certificates specified +explicitly +either by file or directory +are added to those given by the system default location. These certificates should be for the certificate authorities trusted, rather than the public cert of individual clients. With both OpenSSL and GnuTLS, if the value is a file then the certificates are sent by Exim as a server to connecting clients, defining the list of accepted certificate authorities. Thus the values defined should be considered public data. To avoid this, -use OpenSSL with a directory. +use the explicit directory version. See &<>& for discussion of when this option might be re-expanded. @@ -16580,6 +17179,46 @@ If the expansion fails (other than forced failure) delivery is deferred. Some of the other precondition options are common special cases that could in fact be specified using &%condition%&. +Historical note: We have &%condition%& on ACLs and on Routers. Routers +are far older, and use one set of semantics. ACLs are newer and when +they were created, the ACL &%condition%& process was given far stricter +parse semantics. The &%bool{}%& expansion condition uses the same rules as +ACLs. The &%bool_lax{}%& expansion condition uses the same rules as +Routers. More pointedly, the &%bool_lax{}%& was written to match the existing +Router rules processing behavior. + +This is best illustrated in an example: +.code +# If used in an ACL condition will fail with a syntax error, but +# in a router condition any extra characters are treated as a string + +$ exim -be '${if eq {${lc:GOOGLE.com}} {google.com}} {yes} {no}}' +true {yes} {no}} + +$ exim -be '${if eq {${lc:WHOIS.com}} {google.com}} {yes} {no}}' + {yes} {no}} +.endd +In each example above, the &%if%& statement actually ends after +&"{google.com}}"&. Since no true or false braces were defined, the +default &%if%& behavior is to return a boolean true or a null answer +(which evaluates to false). The rest of the line is then treated as a +string. So the first example resulted in the boolean answer &"true"& +with the string &" {yes} {no}}"& appended to it. The second example +resulted in the null output (indicating false) with the string +&" {yes} {no}}"& appended to it. + +In fact you can put excess forward braces in too. In the router +&%condition%&, Exim's parser only looks for &"{"& symbols when they +mean something, like after a &"$"& or when required as part of a +conditional. But otherwise &"{"& and &"}"& are treated as ordinary +string characters. + +Thus, in a Router, the above expansion strings will both always evaluate +true, as the result of expansion is a non-empty string which doesn't +match an explicit false value. This can be tricky to debug. By +contrast, in an ACL either of those strings will always result in an +expansion error because the result doesn't look sufficiently boolean. + .option debug_print routers string&!! unset .cindex "testing" "variables in drivers" @@ -16604,6 +17243,25 @@ or for any deliveries caused by this router. You should not set this option unless you really, really know what you are doing. See also the generic transport option of the same name. +.option dnssec_request_domains routers "domain list&!!" unset +.cindex "MX record" "security" +.cindex "DNSSEC" "MX lookup" +.cindex "security" "MX lookup" +.cindex "DNS" "DNSSEC" +DNS lookups for domains matching &%dnssec_request_domains%& will be done with +the dnssec request bit set. +This applies to all of the SRV, MX, AAAA, A lookup sequence. + +.option dnssec_require_domains routers "domain list&!!" unset +.cindex "MX record" "security" +.cindex "DNSSEC" "MX lookup" +.cindex "security" "MX lookup" +.cindex "DNS" "DNSSEC" +DNS lookups for domains matching &%dnssec_request_domains%& will be done with +the dnssec request bit set. Any returns not having the Authenticated Data bit +(AD bit) set will be ignored and logged as a host-lookup failure. +This applies to all of the SRV, MX, AAAA, A lookup sequence. + .option domains routers&!? "domain list&!!" unset .cindex "router" "restricting to specific domains" @@ -16621,6 +17279,15 @@ This option must always be set. It specifies which of the available routers is to be used. +.option dsn_lasthop routers boolean false +.cindex "DSN" "success" +.cindex "Delivery Status Notification" "success" +If this option is set true, and extended DSN (RFC3461) processing is in effect, +Exim will not pass on DSN requests to downstream DSN-aware hosts but will +instead send a success DSN as if the next hop does not support DSN. +Not effective on redirect routers. + + .option errors_to routers string&!! unset .cindex "envelope sender" @@ -16739,11 +17406,13 @@ and the discussion in chapter &<>&. -.option headers_add routers string&!! unset +.option headers_add routers list&!! unset .cindex "header lines" "adding" .cindex "router" "adding header lines" -This option specifies a string of text that is expanded at routing time, and -associated with any addresses that are accepted by the router. However, this +This option specifies a list of text headers, +newline-separated (by default, changeable in the usual way), +that is associated with any addresses that are accepted by the router. +Each item is separately expanded, at routing time. However, this option has no effect when an address is just being verified. The way in which the text is used to add header lines at transport time is described in section &<>&. New header lines are not actually added until the @@ -16752,8 +17421,8 @@ header lines in string expansions in the transport's configuration do not &"see"& the added header lines. The &%headers_add%& option is expanded after &%errors_to%&, but before -&%headers_remove%& and &%transport%&. If the expanded string is empty, or if -the expansion is forced to fail, the option has no effect. Other expansion +&%headers_remove%& and &%transport%&. If an item is empty, or if +an item expansion is forced to fail, the item has no effect. Other expansion failures are treated as configuration errors. Unlike most options, &%headers_add%& can be specified multiple times @@ -16775,11 +17444,13 @@ avoided. The &%repeat_use%& option of the &%redirect%& router may be of help. -.option headers_remove routers string&!! unset +.option headers_remove routers list&!! unset .cindex "header lines" "removing" .cindex "router" "removing header lines" -This option specifies a string of text that is expanded at routing time, and -associated with any addresses that are accepted by the router. However, this +This option specifies a list of text headers, +colon-separated (by default, changeable in the usual way), +that is associated with any addresses that are accepted by the router. +Each item is separately expanded, at routing time. However, this option has no effect when an address is just being verified. The way in which the text is used to remove header lines at transport time is described in section &<>&. Header lines are not actually removed until @@ -16788,8 +17459,8 @@ to header lines in string expansions in the transport's configuration still &"see"& the original header lines. The &%headers_remove%& option is expanded after &%errors_to%& and -&%headers_add%&, but before &%transport%&. If the expansion is forced to fail, -the option has no effect. Other expansion failures are treated as configuration +&%headers_add%&, but before &%transport%&. If an item expansion is forced to fail, +the item has no effect. Other expansion failures are treated as configuration errors. Unlike most options, &%headers_remove%& can be specified multiple times @@ -16803,6 +17474,11 @@ removal requests are deleted when the address is passed on to subsequent routers, and this can lead to problems with duplicates -- see the similar warning for &%headers_add%& above. +&*Warning 3*&: Because of the separate expansion of the list items, +items that contain a list separator must have it doubled. +To avoid this, change the list separator (&<>&). + + .option ignore_target_hosts routers "host list&!!" unset .cindex "IP address" "discarding" @@ -17451,6 +18127,7 @@ delivering in cutthrough mode or testing recipient verification using &%-bv%&. See section &<>& for a list of the order in which preconditions are evaluated. +See also the &$verify_mode$& variable. .option verify_sender routers&!? boolean true @@ -17458,6 +18135,7 @@ If this option is false, the router is skipped when verifying sender addresses or testing sender verification using &%-bvs%&. See section &<>& for a list of the order in which preconditions are evaluated. +See also the &$verify_mode$& variable. .ecindex IIDgenoprou1 .ecindex IIDgenoprou2 @@ -17532,7 +18210,7 @@ happens is controlled by the generic &%self%& option. .section "Problems with DNS lookups" "SECTprowitdnsloo" There have been problems with DNS servers when SRV records are looked up. -Some mis-behaving servers return a DNS error or timeout when a non-existent +Some misbehaving servers return a DNS error or timeout when a non-existent SRV record is sought. Similar problems have in the past been reported for MX records. The global &%dns_again_means_nonexist%& option can help with this problem, but it is heavy-handed because it is a global option. @@ -17554,6 +18232,9 @@ There are a few cases where a &(dnslookup)& router will decline to accept an address; if such a router is expected to handle "all remaining non-local domains", then it is important to set &%no_more%&. +The router will defer rather than decline if the domain +is found in the &%fail_defer_domains%& router option. + Reasons for a &(dnslookup)& router to decline currently include: .ilist The domain does not exist in DNS @@ -17632,6 +18313,18 @@ when there is a DNS lookup error. + +.option fail_defer_domains dnslookup "domain list&!!" unset +.cindex "MX record" "not found" +DNS lookups for domains matching &%fail_defer_domains%& +which find no matching record will cause the router to defer +rather than the default behaviour of decline. +This maybe be useful for queueing messages for a newly created +domain while the DNS configuration is not ready. +However, it will result in any message with mistyped domains +also being queued. + + .option mx_domains dnslookup "domain list&!!" unset .cindex "MX record" "required to exist" .cindex "SRV record" "required to exist" @@ -18600,6 +19293,11 @@ However, there are some private options which define transports for delivery to files and pipes, and for generating autoreplies. See the &%file_transport%&, &%pipe_transport%& and &%reply_transport%& descriptions below. +If success DSNs have been requested +.cindex "DSN" "success" +.cindex "Delivery Status Notification" "success" +redirection triggers one and the DSN options are not passed any further. + .section "Redirection data" "SECID124" @@ -18866,7 +19564,7 @@ the router to decline. Instead, the alias item .cindex "black hole" .cindex "abandoning mail" &':blackhole:'& can be used. It does what its name implies. No delivery is -done, and no error message is generated. This has the same effect as specifing +done, and no error message is generated. This has the same effect as specifying &_/dev/null_& as a destination, but it can be independently disabled. &*Warning*&: If &':blackhole:'& appears anywhere in a redirection list, no @@ -19789,10 +20487,12 @@ value that the router supplies, and also overriding any value associated with &%user%& (see below). -.option headers_add transports string&!! unset +.option headers_add transports list&!! unset .cindex "header lines" "adding in transport" .cindex "transport" "header lines; adding" -This option specifies a string of text that is expanded and added to the header +This option specifies a list of text headers, +newline-separated (by default, changeable in the usual way), +which are (separately) expanded and added to the header portion of a message as it is transported, as described in section &<>&. Additional header lines can also be specified by routers. If the result of the expansion is an empty string, or if the expansion @@ -19813,18 +20513,25 @@ transports, the settings of &%message_prefix%& and &%message_suffix%& should be checked, since this option does not automatically suppress them. -.option headers_remove transports string&!! unset +.option headers_remove transports list&!! unset .cindex "header lines" "removing" .cindex "transport" "header lines; removing" -This option specifies a string that is expanded into a list of header names; +This option specifies a list of header names, +colon-separated (by default, changeable in the usual way); these headers are omitted from the message as it is transported, as described in section &<>&. Header removal can also be specified by -routers. If the result of the expansion is an empty string, or if the expansion +routers. +Each list item is separately expanded. +If the result of the expansion is an empty string, or if the expansion is forced to fail, no action is taken. Other expansion failures are treated as errors and cause the delivery to be deferred. Unlike most options, &%headers_remove%& can be specified multiple times -for a router; all listed headers are added. +for a router; all listed headers are removed. + +&*Warning*&: Because of the separate expansion of the list items, +items that contain a list separator must have it doubled. +To avoid this, change the list separator (&<>&). @@ -19874,6 +20581,32 @@ transport, the &[initgroups()]& function is called when running the transport to ensure that any additional groups associated with the uid are set up. +.new +.option max_parallel transports integer&!! unset +.cindex limit "transport parallelism" +.cindex transport "parallel processes" +.cindex transport "concurrency limit" +.cindex "delivery" "parallelism for transport" +If this option is set and expands to an integer greater than zero +it limits the number of concurrent runs of the transport. +The control does not apply to shadow transports. + +.cindex "hints database" "transport concurrency control" +Exim implements this control by means of a hints database in which a record is +incremented whenever a transport process is beaing created. The record +is decremented and possibly removed when the process terminates. +Obviously there is scope for +records to get left lying around if there is a system or program crash. To +guard against this, Exim ignores any records that are more than six hours old. + +If you use this option, you should also arrange to delete the +relevant hints database whenever your system reboots. The names of the files +start with &_misc_& and they are kept in the &_spool/db_& directory. There +may be one or two files, depending on the type of DBM in use. The same files +are used for ETRN and smtp transport serialization. +.wen + + .option message_size_limit transports string&!! 0 .cindex "limit" "message size per transport" .cindex "size" "of message, limit" @@ -20020,6 +20753,9 @@ headers that some sites insist on. This option sets up a filtering (in the Unix shell sense) process for messages at transport time. It should not be confused with mail filtering as set up by individual users or via a system filter. +.new +If unset, or expanding to an empty string, no filtering is done. +.wen When the message is about to be written out, the command specified by &%transport_filter%& is started up in a separate, parallel process, and @@ -21771,6 +22507,10 @@ If two messages arrive at almost the same time, and both are routed to a pipe delivery, the two pipe transports may be run concurrently. You must ensure that any pipe commands you set up are robust against this happening. If the commands write to a file, the &%exim_lock%& utility might be of use. +.new +Alternatively the &%max_parallel%& option could be used with a value +of "1" to enforce serialization. +.wen @@ -22035,6 +22775,7 @@ Note that &$address_pipe$& is handled specially in &%command%& when &%force_command%& is set, expanding out to the original argument vector as separate items, similarly to a Unix shell &`"$@"`& construct. + .option ignore_status pipe boolean false If this option is true, the status returned by the subprocess that is set up to run the command is ignored, and Exim behaves as if zero had been returned. @@ -22045,27 +22786,29 @@ from the transport unless the status value is one of those listed in &*Note*&: This option does not apply to timeouts, which do not return a status. See the &%timeout_defer%& option for how timeouts are handled. + .option log_defer_output pipe boolean false .cindex "&(pipe)& transport" "logging output" If this option is set, and the status returned by the command is one of the codes listed in &%temp_errors%& (that is, delivery was deferred), -and any output was produced, the first line of it is written to the main log. +and any output was produced on stdout or stderr, the first line of it is +written to the main log. .option log_fail_output pipe boolean false -If this option is set, and the command returns any output, and also ends with a -return code that is neither zero nor one of the return codes listed in -&%temp_errors%& (that is, the delivery failed), the first line of output is -written to the main log. This option and &%log_output%& are mutually exclusive. -Only one of them may be set. - +If this option is set, and the command returns any output on stdout or +stderr, and also ends with a return code that is neither zero nor one of +the return codes listed in &%temp_errors%& (that is, the delivery +failed), the first line of output is written to the main log. This +option and &%log_output%& are mutually exclusive. Only one of them may +be set. .option log_output pipe boolean false -If this option is set and the command returns any output, the first line of -output is written to the main log, whatever the return code. This option and -&%log_fail_output%& are mutually exclusive. Only one of them may be set. - +If this option is set and the command returns any output on stdout or +stderr, the first line of output is written to the main log, whatever +the return code. This option and &%log_fail_output%& are mutually +exclusive. Only one of them may be set. .option max_output pipe integer 20K @@ -22532,6 +23275,29 @@ See the &%search_parents%& option in chapter &<>& for more details. +.option dnssec_request_domains smtp "domain list&!!" unset +.cindex "MX record" "security" +.cindex "DNSSEC" "MX lookup" +.cindex "security" "MX lookup" +.cindex "DNS" "DNSSEC" +DNS lookups for domains matching &%dnssec_request_domains%& will be done with +the dnssec request bit set. +This applies to all of the SRV, MX, AAAA, A lookup sequence. + + + +.option dnssec_require_domains smtp "domain list&!!" unset +.cindex "MX record" "security" +.cindex "DNSSEC" "MX lookup" +.cindex "security" "MX lookup" +.cindex "DNS" "DNSSEC" +DNS lookups for domains matching &%dnssec_request_domains%& will be done with +the dnssec request bit set. Any returns not having the Authenticated Data bit +(AD bit) set will be ignored and logged as a host-lookup failure. +This applies to all of the SRV, MX, AAAA, A lookup sequence. + + + .option dscp smtp string&!! unset .cindex "DCSP" "outbound" This option causes the DSCP value associated with a socket to be set to one @@ -22679,12 +23445,11 @@ that matches this list, even if the server host advertises PIPELINING support. Exim will not try to start a TLS session when delivering to any host that matches this list. See chapter &<>& for details of TLS. -.option hosts_verify_avoid_tls smtp "host list&!!" * +.option hosts_verify_avoid_tls smtp "host list&!!" unset .cindex "TLS" "avoiding for certain hosts" Exim will not try to start a TLS session for a verify callout, or when delivering in cutthrough mode, to any host that matches this list. -Note that the default is to not use TLS. .option hosts_max_try smtp integer 5 @@ -22754,6 +23519,18 @@ hard failure if required. See also &%hosts_try_auth%&, and chapter &<>& for details of authentication. +.option hosts_request_ocsp smtp "host list&!!" * +.cindex "TLS" "requiring for certain servers" +Exim will request a Certificate Status on a +TLS session for any host that matches this list. +&%tls_verify_certificates%& should also be set for the transport. + +.option hosts_require_ocsp smtp "host list&!!" unset +.cindex "TLS" "requiring for certain servers" +Exim will request, and check for a valid Certificate Status being given, on a +TLS session for any host that matches this list. +&%tls_verify_certificates%& should also be set for the transport. + .option hosts_require_tls smtp "host list&!!" unset .cindex "TLS" "requiring for certain servers" Exim will insist on using a TLS session when delivering to any host that @@ -22769,6 +23546,13 @@ connects. If authentication fails, Exim will try to transfer the message unauthenticated. See also &%hosts_require_auth%&, and chapter &<>& for details of authentication. +.option hosts_try_prdr smtp "host list&!!" * +.cindex "PRDR" "enabling, optional in client" +This option provides a list of servers to which, provided they announce +PRDR support, Exim will attempt to negotiate PRDR +for multi-recipient messages. +The option can usually be left as default. + .option interface smtp "string list&!!" unset .cindex "bind IP address" .cindex "IP address" "binding" @@ -22825,7 +23609,7 @@ so can cause parallel connections to the same host if &%remote_max_parallel%& permits this. -.option multi_domain smtp boolean true +.option multi_domain smtp boolean&!! true .vindex "&$domain$&" When this option is set, the &(smtp)& transport can handle a number of addresses containing a mixture of different domains provided they all resolve @@ -22834,6 +23618,9 @@ handling only one domain at a time. This is useful if you want to use &$domain$& in an expansion for the transport, because it is set only when there is a single domain involved in a remote delivery. +It is expanded per-address and can depend on any of +&$address_data$&, &$domain_data$&, &$local_part_data$&, +&$host$&, &$host_address$& and &$host_port$&. .option port smtp string&!! "see below" .cindex "port" "sending TCP/IP" @@ -22863,13 +23650,13 @@ protocol (RFC 2033) instead of SMTP. This protocol is sometimes used for local deliveries into closed message stores. Exim also has support for running LMTP over a pipe to a local process &-- see chapter &<>&. -If this option is set to &"smtps"&, the default vaule for the &%port%& option +If this option is set to &"smtps"&, the default value for the &%port%& option changes to &"smtps"&, and the transport initiates TLS immediately after connecting, as an outbound SSL-on-connect, instead of using STARTTLS to upgrade. The Internet standards bodies strongly discourage use of this mode. -.option retry_include_ip_address smtp boolean true +.option retry_include_ip_address smtp boolean&!! true Exim normally includes both the host name and the IP address in the key it constructs for indexing retry data after a temporary delivery failure. This means that when one of several IP addresses for a host is failing, it gets @@ -22879,9 +23666,8 @@ addresses is not affected. However, in some dialup environments hosts are assigned a different IP address each time they connect. In this situation the use of the IP address as part of the retry key leads to undesirable behaviour. Setting this option false causes -Exim to use only the host name. This should normally be done on a separate -instance of the &(smtp)& transport, set up specially to handle the dialup -hosts. +Exim to use only the host name. +Since it is expanded it can be made to depend on the host or domain. .option serialize_hosts smtp "host list&!!" unset @@ -22907,6 +23693,10 @@ start with &_misc_& and they are kept in the &_spool/db_& directory. There may be one or two files, depending on the type of DBM in use. The same files are used for ETRN serialization. +.new +See also the &%max_parallel%& generic transport option. +.wen + .option size_addition smtp integer 1024 .cindex "SMTP" "SIZE" @@ -23019,20 +23809,75 @@ unknown state), opens a new one to the same host, and then tries the delivery in clear. -.option tls_verify_certificates smtp string&!! unset +.option tls_try_verify_hosts smtp "host list&!!" * +.cindex "TLS" "server certificate verification" +.cindex "certificate" "verification of server" +This option gives a list of hosts for which, on encrypted connections, +certificate verification will be tried but need not succeed. +The &%tls_verify_certificates%& option must also be set. +Note that unless the host is in this list +TLS connections will be denied to hosts using self-signed certificates +when &%tls_verify_certificates%& is matched. +The &$tls_out_certificate_verified$& variable is set when +certificate verification succeeds. + + +.option tls_verify_cert_hostnames smtp "host list&!!" * +.cindex "TLS" "server certificate hostname verification" +.cindex "certificate" "verification of server" +This option give a list of hosts for which, +while verifying the server certificate, +checks will be included on the host name +(note that this will generally be the result of a DNS MX lookup) +versus Subject and Subject-Alternate-Name fields. Wildcard names are permitted +limited to being the initial component of a 3-or-more component FQDN. + +There is no equivalent checking on client certificates. + + +.option tls_verify_certificates smtp string&!! system .cindex "TLS" "server certificate verification" .cindex "certificate" "verification of server" .vindex "&$host$&" .vindex "&$host_address$&" -The value of this option must be the absolute path to a file containing -permitted server certificates, for use when setting up an encrypted connection. -Alternatively, if you are using OpenSSL, you can set -&%tls_verify_certificates%& to the name of a directory containing certificate -files. This does not work with GnuTLS; the option must be set to the name of a -single file if you are using GnuTLS. The values of &$host$& and +The value of this option must be either the +word "system" +or the absolute path to +a file or directory containing permitted certificates for servers, +for use when setting up an encrypted connection. + +The "system" value for the option will use a location compiled into the SSL library. +This is not available for GnuTLS versions preceding 3.0.20; a value of "system" +is taken as empty and an explicit location +must be specified. + +The use of a directory for the option value is not available for GnuTLS versions +preceding 3.3.6 and a single file must be used. + +With OpenSSL the certificates specified +explicitly +either by file or directory +are added to those given by the system default location. + +The values of &$host$& and &$host_address$& are set to the name and address of the server during the expansion of this option. See chapter &<>& for details of TLS. +For back-compatibility, +if neither tls_verify_hosts nor tls_try_verify_hosts are set +(a single-colon empty list counts as being set) +and certificate verification fails the TLS connection is closed. + + +.option tls_verify_hosts smtp "host list&!!" unset +.cindex "TLS" "server certificate verification" +.cindex "certificate" "verification of server" +This option gives a list of hosts for which. on encrypted connections, +certificate verification must succeed. +The &%tls_verify_certificates%& option must also be set. +If both this option and &%tls_try_verify_hosts%& are unset +operation is as if this option selected all hosts. + @@ -23775,6 +24620,13 @@ A server unexpectedly closed the SMTP connection. There may, of course, legitimate reasons for this (host died, network died), but if it repeats a lot for the same host, it indicates something odd. +.vitem &%lookup%& +A DNS lookup for a host failed. +Note that a &%dnslookup%& router will need to have matched +its &%fail_defer_domains%& option for this retry type to be usable. +Also note that a &%manualroute%& router will probably need +its &%host_find_failed%& option set to &%defer%&. + .vitem &%refused_MX%& A connection to a host obtained from an MX record was refused. @@ -24186,6 +25038,7 @@ AUTH_GSASL=yes AUTH_HEIMDAL_GSSAPI=yes AUTH_PLAINTEXT=yes AUTH_SPA=yes +AUTH_TLS=yes .endd in &_Local/Makefile_&, respectively. The first of these supports the CRAM-MD5 authentication mechanism (RFC 2195), and the second provides an interface to @@ -24200,6 +25053,8 @@ The sixth can be configured to support the PLAIN authentication mechanism (RFC 2595) or the LOGIN mechanism, which is not formally documented, but used by several MUAs. The seventh authenticator supports Microsoft's &'Secure Password Authentication'& mechanism. +The eighth is an Exim authenticator but not an SMTP one; +instead it can use information from a TLS negotiation. The authenticators are configured using the same syntax as other drivers (see section &<>&). If no authenticators are required, no @@ -24271,7 +25126,7 @@ client_condition = ${if !eq{$tls_out_cipher}{}} .option client_set_id authenticators string&!! unset When client authentication succeeds, this condition is expanded; the -result is used in the log lines for outbound messasges. +result is used in the log lines for outbound messages. Typically it will be the user name used for authentication. @@ -24919,7 +25774,7 @@ cyrusless_crammd5: driver = cram_md5 public_name = CRAM-MD5 server_secret = ${lookup{$auth1:mail.example.org:userPassword}\ - dbmjz{/etc/sasldb2}} + dbmjz{/etc/sasldb2}{$value}fail} server_set_id = $auth1 .endd @@ -25074,6 +25929,7 @@ but it is present in many binary distributions. .scindex IIDdcotauth2 "authenticators" "&(dovecot)&" This authenticator is an interface to the authentication facility of the Dovecot POP/IMAP server, which can support a number of authentication methods. +Note that Dovecot must be configured to use auth-client not auth-userdb. If you are using Dovecot to authenticate POP/IMAP clients, it might be helpful to use the same mechanisms for SMTP authentication. This is a server authenticator only. There is only one option: @@ -25089,7 +25945,7 @@ dovecot_plain: driver = dovecot public_name = PLAIN server_socket = /var/run/dovecot/auth-client - server_set_id = $auth2 + server_set_id = $auth1 dovecot_ntlm: driver = dovecot @@ -25288,7 +26144,7 @@ The value should be a pathname, with no &"file:"& prefix. .option server_service heimdal_gssapi string&!! "smtp" This option specifies the service identifier used, in conjunction with -&%server_hostname%&, for building the identifer for finding credentials +&%server_hostname%&, for building the identifier for finding credentials from the keytab. @@ -25405,6 +26261,79 @@ msn: +. //////////////////////////////////////////////////////////////////////////// +. //////////////////////////////////////////////////////////////////////////// + +.chapter "The tls authenticator" "CHAPtlsauth" +.scindex IIDtlsauth1 "&(tls)& authenticator" +.scindex IIDtlsauth2 "authenticators" "&(tls)&" +.cindex "authentication" "Client Certificate" +.cindex "authentication" "X509" +.cindex "Certificate-based authentication" +The &(tls)& authenticator provides server support for +authentication based on client certificates. + +It is not an SMTP authentication mechanism and is not +advertised by the server as part of the SMTP EHLO response. +It is an Exim authenticator in the sense that it affects +the protocol element of the log line, can be tested for +by the &%authenticated%& ACL condition, and can set +the &$authenticated_id$& variable. + +The client must present a verifiable certificate, +for which it must have been requested via the +&%tls_verify_hosts%& or &%tls_try_verify_hosts%& main options +(see &<>&). + +If an authenticator of this type is configured it is +run before any SMTP-level communication is done, +and can authenticate the connection. +If it does, SMTP authentication is not offered. + +A maximum of one authenticator of this type may be present. + + +.cindex "options" "&(tls)& authenticator (server)" +The &(tls)& authenticator has three server options: + +.option server_param1 tls string&!! unset +.cindex "variables (&$auth1$& &$auth2$& etc)" "in &(tls)& authenticator" +This option is expanded after the TLS negotiation and +the result is placed in &$auth1$&. +If the expansion is forced to fail, authentication fails. Any other expansion +failure causes a temporary error code to be returned. + +.option server_param2 tls string&!! unset +.option server_param3 tls string&!! unset +As above, for &$auth2$& and &$auth3$&. + +&%server_param1%& may also be spelled &%server_param%&. + + +Example: +.code +tls: + driver = tls + server_param1 = ${certextract {subj_altname,mail,>:} \ + {$tls_in_peercert}} + server_condition = ${if forany {$auth1} \ + {!= {0} \ + {${lookup ldap{ldap:///\ + mailname=${quote_ldap_dn:${lc:$item}},\ + ou=users,LDAP_DC?mailid} {$value}{0} \ + } } } } + server_set_id = ${if = {1}{${listcount:$auth1}} {$auth1}{}} +.endd +.ecindex IIDtlsauth1 +.ecindex IIDtlsauth2 + + +Note that because authentication is traditionally an SMTP operation, +the &%authenticated%& ACL condition cannot be used in +a connect- or helo-ACL. + + + . //////////////////////////////////////////////////////////////////////////// . //////////////////////////////////////////////////////////////////////////// @@ -25495,8 +26424,10 @@ include files and libraries for GnuTLS can be found. There are some differences in usage when using GnuTLS instead of OpenSSL: .ilist -The &%tls_verify_certificates%& option must contain the name of a file, not the -name of a directory (for OpenSSL it can be either). +The &%tls_verify_certificates%& option +cannot be the path of a directory +for GnuTLS versions before 3.3.6 +(for later versions, or OpenSSL, it can be either). .next The default value for &%tls_dhparam%& differs for historical reasons. .next @@ -25693,7 +26624,8 @@ The GnuTLS library allows the caller to provide a "priority string", documented as part of the &[gnutls_priority_init]& function. This is very similar to the ciphersuite specification in OpenSSL. -The &%tls_require_ciphers%& option is treated as the GnuTLS priority string. +The &%tls_require_ciphers%& option is treated as the GnuTLS priority string +and controls both protocols and ciphers. The &%tls_require_ciphers%& option is available both as an global option, controlling how Exim behaves as a server, and also as an option of the @@ -25710,6 +26642,12 @@ installed on your system. If you are using GnuTLS 3, &url(http://www.gnutls.org/manual/gnutls.html#Listing-the-ciphersuites-in-a-priority-string, then the example code) on that site can be used to test a given string. +For example: +.code +# Disable older versions of protocols +tls_require_ciphers = NORMAL:%LATEST_RECORD_VERSION:-VERS-SSL3.0 +.endd + Prior to Exim 4.80, an older API of GnuTLS was used, and Exim supported three additional options, "&%gnutls_require_kx%&", "&%gnutls_require_mac%&" and "&%gnutls_require_protocols%&". &%tls_require_ciphers%& was an Exim list. @@ -25760,8 +26698,11 @@ tls_privatekey = /some/file/name These options are, in fact, expanded strings, so you can make them depend on the identity of the client that is connected if you wish. The first file contains the server's X509 certificate, and the second contains the private key -that goes with it. These files need to be readable by the Exim user, and must -always be given as full path names. They can be the same file if both the +that goes with it. These files need to be +PEM format and readable by the Exim user, and must +always be given as full path names. +The key must not be password-protected. +They can be the same file if both the certificate and the key are contained within it. If &%tls_privatekey%& is not set, or if its expansion is forced to fail or results in an empty string, this is assumed to be the case. The certificate file may also contain intermediate @@ -25837,8 +26778,10 @@ session with a client, you must set either &%tls_verify_hosts%& or apply to all TLS connections. For any host that matches one of these options, Exim requests a certificate as part of the setup of the TLS session. The contents of the certificate are verified by comparing it with a list of -expected certificates. These must be available in a file or, -for OpenSSL only (not GnuTLS), a directory, identified by +expected certificates. +These may be the system default set (depending on library version), +an explicit file or, +depending on library version, a directory, identified by &%tls_verify_certificates%&. A file can contain multiple certificates, concatenated end to end. If a @@ -25880,12 +26823,83 @@ certificate is supplied, &$tls_in_peerdn$& is empty. .cindex "TLS" "revoked certificates" .cindex "revocation list" .cindex "certificate" "revocation list" +.cindex "OCSP" "stapling" Certificate issuing authorities issue Certificate Revocation Lists (CRLs) when certificates are revoked. If you have such a list, you can pass it to an Exim server using the global option called &%tls_crl%& and to an Exim client using an identically named option for the &(smtp)& transport. In each case, the value of the option is expanded and must then be the name of a file that contains a CRL in PEM format. +The downside is that clients have to periodically re-download a potentially huge +file from every certificate authority they know of. + +The way with most moving parts at query time is Online Certificate +Status Protocol (OCSP), where the client verifies the certificate +against an OCSP server run by the CA. This lets the CA track all +usage of the certs. It requires running software with access to the +private key of the CA, to sign the responses to the OCSP queries. OCSP +is based on HTTP and can be proxied accordingly. + +The only widespread OCSP server implementation (known to this writer) +comes as part of OpenSSL and aborts on an invalid request, such as +connecting to the port and then disconnecting. This requires +re-entering the passphrase each time some random client does this. + +The third way is OCSP Stapling; in this, the server using a certificate +issued by the CA periodically requests an OCSP proof of validity from +the OCSP server, then serves it up inline as part of the TLS +negotiation. This approach adds no extra round trips, does not let the +CA track users, scales well with number of certs issued by the CA and is +resilient to temporary OCSP server failures, as long as the server +starts retrying to fetch an OCSP proof some time before its current +proof expires. The downside is that it requires server support. + +Unless Exim is built with the support disabled, +.new +or with GnuTLS earlier than version 3.3.16 / 3.4.8 +.wen +support for OCSP stapling is included. + +There is a global option called &%tls_ocsp_file%&. +The file specified therein is expected to be in DER format, and contain +an OCSP proof. Exim will serve it as part of the TLS handshake. This +option will be re-expanded for SNI, if the &%tls_certificate%& option +contains &`tls_in_sni`&, as per other TLS options. + +Exim does not at this time implement any support for fetching a new OCSP +proof. The burden is on the administrator to handle this, outside of +Exim. The file specified should be replaced atomically, so that the +contents are always valid. Exim will expand the &%tls_ocsp_file%& option +on each connection, so a new file will be handled transparently on the +next connection. + +When built with OpenSSL Exim will check for a valid next update timestamp +in the OCSP proof; if not present, or if the proof has expired, it will be +ignored. + +For the client to be able to verify the stapled OCSP the server must +also supply, in its stapled information, any intermediate +certificates for the chain leading to the OCSP proof from the signer +of the server certificate. There may be zero or one such. These +intermediate certificates should be added to the server OCSP stapling +file named by &%tls_ocsp_file%&. + +Note that the proof only covers the terminal server certificate, +not any of the chain from CA to it. + +There is no current way to staple a proof for a client certificate. + +.code + A helper script "ocsp_fetch.pl" for fetching a proof from a CA + OCSP server is supplied. The server URL may be included in the + server certificate, if the CA is helpful. + + One failure mode seen was the OCSP Signer cert expiring before the end + of validity of the OCSP proof. The checking done by Exim/OpenSSL + noted this as invalid overall, but the re-fetch script did not. +.endd + + .section "Configuring an Exim client to use TLS" "SECID185" @@ -25929,11 +26943,34 @@ if it requests it. If the server is Exim, it will request a certificate only if &%tls_verify_hosts%& or &%tls_try_verify_hosts%& matches the client. If the &%tls_verify_certificates%& option is set on the &(smtp)& transport, it +specifies a collection of expected server certificates. +These may be the system default set (depending on library version), +a file or, +depending on library version, a directory, must name a file or, -for OpenSSL only (not GnuTLS), a directory, that contains a collection of -expected server certificates. The client verifies the server's certificate +for OpenSSL only (not GnuTLS), a directory. +The client verifies the server's certificate against this collection, taking into account any revoked certificates that are in the list defined by &%tls_crl%&. +Failure to verify fails the TLS connection unless either of the +&%tls_verify_hosts%& or &%tls_try_verify_hosts%& options are set. + +The &%tls_verify_hosts%& and &%tls_try_verify_hosts%& options restrict +certificate verification to the listed servers. Verification either must +or need not succeed respectively. + +The &(smtp)& transport has two OCSP-related options: +&%hosts_require_ocsp%&; a host-list for which a Certificate Status +is requested and required for the connection to proceed. The default +value is empty. +&%hosts_request_ocsp%&; a host-list for which (additionally) +a Certificate Status is requested (but not necessarily verified). The default +value is "*" meaning that requests are made unless configured +otherwise. + +The host(s) should also be in &%hosts_require_tls%&, and +&%tls_verify_certificates%& configured for the transport, +for OCSP to be relevant. If &%tls_require_ciphers%& is set on the &(smtp)& transport, it must contain a @@ -25979,7 +27016,7 @@ client in the initial handshake, so that the server can examine the servername within and possibly choose to use different certificates and keys (and more) for this session. -This is analagous to HTTP's &"Host:"& header, and is the main mechanism by +This is analogous to HTTP's &"Host:"& header, and is the main mechanism by which HTTPS-enabled web-sites can be virtual-hosted, many sites to one IP address. @@ -26020,6 +27057,9 @@ during TLS session handshake, to permit alternative values to be chosen: .next .vindex "&%tls_verify_certificates%&" &%tls_verify_certificates%& +.next +.vindex "&%tls_ocsp_file%&" +&%tls_ocsp_file%& .endlist Great care should be taken to deal with matters of case, various injection @@ -26030,7 +27070,7 @@ arbitrary unverified data provided prior to authentication. The Exim developers are proceeding cautiously and so far no other TLS options are re-expanded. -When Exim is built againt OpenSSL, OpenSSL must have been built with support +When Exim is built against OpenSSL, OpenSSL must have been built with support for TLS Extensions. This holds true for OpenSSL 1.0.0+ and 0.9.8+ with enable-tlsext in EXTRACONFIGURE. If you invoke &(openssl s_client -h)& and see &`-servername`& in the output, then OpenSSL has support. @@ -26220,6 +27260,7 @@ options in the main part of the configuration. These options are: .cindex "EXPN" "ACL for" .cindex "HELO" "ACL for" .cindex "EHLO" "ACL for" +.cindex "DKIM" "ACL for" .cindex "MAIL" "ACL for" .cindex "QUIT, ACL for" .cindex "RCPT" "ACL for" @@ -26228,6 +27269,7 @@ options in the main part of the configuration. These options are: .cindex "SMTP" "connection, ACL for" .cindex "non-SMTP messages" "ACLs for" .cindex "MIME content scanning" "ACL for" +.cindex "PRDR" "ACL for" .table2 140pt .irow &%acl_not_smtp%& "ACL for non-SMTP messages" @@ -26236,6 +27278,8 @@ options in the main part of the configuration. These options are: .irow &%acl_smtp_auth%& "ACL for AUTH" .irow &%acl_smtp_connect%& "ACL for start of SMTP connection" .irow &%acl_smtp_data%& "ACL after DATA is complete" +.irow &%acl_smtp_data_prdr%& "ACL for each recipient, after DATA is complete" +.irow &%acl_smtp_dkim%& "ACL for each DKIM signer" .irow &%acl_smtp_etrn%& "ACL for ETRN" .irow &%acl_smtp_expn%& "ACL for EXPN" .irow &%acl_smtp_helo%& "ACL for HELO or EHLO" @@ -26350,8 +27394,10 @@ before or after the data) correctly &-- they keep the message on their queues and try again later, but that is their problem, though it does waste some of your resources. -The &%acl_smtp_data%& ACL is run after both the &%acl_smtp_dkim%& and -the &%acl_smtp_mime%& ACLs. +The &%acl_smtp_data%& ACL is run after +the &%acl_smtp_data_prdr%&, +the &%acl_smtp_dkim%& +and the &%acl_smtp_mime%& ACLs. .section "The SMTP DKIM ACL" "SECTDKIMACL" The &%acl_smtp_dkim%& ACL is available only when Exim is compiled with DKIM support @@ -26373,12 +27419,49 @@ content-scanning extension. For details, see chapter &<>&. This ACL is evaluated after &%acl_smtp_dkim%& but before &%acl_smtp_data%&. +.section "The SMTP PRDR ACL" "SECTPRDRACL" +.cindex "PRDR" "ACL for" +.oindex "&%prdr_enable%&" +The &%acl_smtp_data_prdr%& ACL is available only when Exim is compiled +with PRDR support enabled (which is the default). +It becomes active only when the PRDR feature is negotiated between +client and server for a message, and more than one recipient +has been accepted. + +The ACL test specified by &%acl_smtp_data_prdr%& happens after a message +has been received, and is executed once for each recipient of the message +with &$local_part$& and &$domain$& valid. +The test may accept, defer or deny for individual recipients. +The &%acl_smtp_data%& will still be called after this ACL and +can reject the message overall, even if this ACL has accepted it +for some or all recipients. + +PRDR may be used to support per-user content filtering. Without it +one must defer any recipient after the first that has a different +content-filter configuration. With PRDR, the RCPT-time check +.new +.cindex "PRDR" "variable for" +for this can be disabled when the variable &$prdr_requested$& +is &"yes"&. +.wen +Any required difference in behaviour of the main DATA-time +ACL should however depend on the PRDR-time ACL having run, as Exim +will avoid doing so in some situations (e.g. single-recipient mails). + +See also the &%prdr_enable%& global option +and the &%hosts_try_prdr%& smtp transport option. + +This ACL is evaluated after &%acl_smtp_dkim%& but before &%acl_smtp_data%&. +If the ACL is not defined, processing completes as if +the feature was not requested by the client. + .section "The QUIT ACL" "SECTQUITACL" .cindex "QUIT, ACL for" The ACL for the SMTP QUIT command is anomalous, in that the outcome of the ACL does not affect the response code to QUIT, which is always 221. Thus, the ACL -does not in fact control any access. For this reason, the only verbs that are -permitted are &%accept%& and &%warn%&. +does not in fact control any access. +For this reason, it may only accept +or warn as its final result. This ACL can be used for tasks such as custom logging at the end of an SMTP session. For example, you can use ACL variables in other ACLs to count @@ -27182,6 +28265,9 @@ anyway. If the message contains newlines, this gives rise to a multi-line SMTP response. .vindex "&$acl_verify_message$&" +For ACLs that are called by an &%acl =%& ACL condition, the message is +stored in &$acl_verify_message$&, from which the calling ACL may use it. + If &%message%& is used on a statement that verifies an address, the message specified overrides any message that is generated by the verification process. However, the original message is available in the variable @@ -27289,25 +28375,41 @@ is what is wanted for subsequent tests. .cindex "&ACL;" "cutthrough routing" .cindex "cutthrough" "requesting" This option requests delivery be attempted while the item is being received. -It is usable in the RCPT ACL and valid only for single-recipient mails forwarded -from one SMTP connection to another. If a recipient-verify callout connection is -requested in the same ACL it is held open and used for the data, otherwise one is made -after the ACL completes. -Note that routers are used in verify mode. Note also that headers cannot be +The option is usable in the RCPT ACL. +If enabled for a message received via smtp and routed to an smtp transport, +and only one transport, interface, destination host and port combination +is used for all recipients of the message, +then the delivery connection is made while the receiving connection is open +and data is copied from one to the other. + +An attempt to set this option for any recipient but the first +for a mail will be quietly ignored. +If a recipient-verify callout connection is subsequently +requested in the same ACL it is held open and used for +any subsequent recipients and the data, +otherwise one is made after the initial RCPT ACL completes. + +Note that routers are used in verify mode, +and cannot depend on content of received headers. +Note also that headers cannot be modified by any of the post-data ACLs (DATA, MIME and DKIM). +Headers may be modified by routers (subject to the above) and transports. + Cutthrough delivery is not supported via transport-filters or when DKIM signing of outgoing messages is done, because it sends data to the ultimate destination before the entire message has been received from the source. +It is not supported for messages received with the SMTP PRDR option in use. Should the ultimate destination system positively accept or reject the mail, a corresponding indication is given to the source system and nothing is queued. If there is a temporary error the item is queued for later delivery in the -usual fashion. If the item is successfully delivered in cutthrough mode the log line -is tagged with ">>" rather than "=>" and appears before the acceptance "<=" -line. +usual fashion. If the item is successfully delivered in cutthrough mode +the delivery log lines are tagged with ">>" rather than "=>" and appear +before the acceptance "<=" line. -Delivery in this mode avoids the generation of a bounce mail to a (possibly faked) +Delivery in this mode avoids the generation of a bounce mail to a +(possibly faked) sender when the destination system is doing content-scan based rejection. @@ -27752,6 +28854,8 @@ can be appended; they appear within the called ACL in $acl_arg1 to $acl_arg9, and $acl_narg is set to the count of values. Previous values of these variables are restored after the call returns. The name and values are expanded separately. +Note that spaces in complex expansions which are used as arguments +will act as argument separators. If the nested &%acl%& returns &"drop"& and the outer condition denies access, the connection is dropped. If it returns &"discard"&, the verb must be @@ -27983,6 +29087,21 @@ This condition checks whether the sending host (the client) is authorized to send email. Details of how this works are given in section &<>&. +.vitem &*verify&~=&~header_names_ascii*& +.cindex "&%verify%& ACL condition" +.cindex "&ACL;" "verifying header names only ASCII" +.cindex "header lines" "verifying header names only ASCII" +.cindex "verifying" "header names only ASCII" +This condition is relevant only in an ACL that is run after a message has been +received, that is, in an ACL specified by &%acl_smtp_data%& or +&%acl_not_smtp%&. It checks all header names (not the content) to make sure +there are no non-ASCII characters, also excluding control characters. The +allowable characters are decimal ASCII values 33 through 126. + +Exim itself will handle headers with non-ASCII characters, but it can cause +problems for downstream applications, so this option will allow their +detection and rejection in the DATA ACL's. + .vitem &*verify&~=&~header_sender/*&<&'options'&> .cindex "&%verify%& ACL condition" .cindex "&ACL;" "verifying sender in the header" @@ -28018,7 +29137,8 @@ This condition is relevant only in an ACL that is run after a message has been received, that is, in an ACL specified by &%acl_smtp_data%& or &%acl_not_smtp%&. It checks the syntax of all header lines that can contain lists of addresses (&'Sender:'&, &'From:'&, &'Reply-To:'&, &'To:'&, &'Cc:'&, -and &'Bcc:'&). Unqualified addresses (local parts without domains) are +and &'Bcc:'&), returning true if there are no problems. +Unqualified addresses (local parts without domains) are permitted only in locally generated messages and from hosts that match &%sender_unqualified_hosts%& or &%recipient_unqualified_hosts%&, as appropriate. @@ -28078,7 +29198,7 @@ verified is redirected to a single address, verification continues with the new address, and in that case, the subsequent value of &$address_data$& is the value for the child address. -.vitem &*verify&~=&~reverse_host_lookup*& +.vitem &*verify&~=&~reverse_host_lookup/*&<&'options'&> .cindex "&%verify%& ACL condition" .cindex "&ACL;" "verifying host reverse lookup" .cindex "host" "verifying reverse lookup" @@ -28089,6 +29209,9 @@ Verification ensures that the host name obtained from a reverse DNS lookup, or one of its aliases, does, when it is itself looked up in the DNS, yield the original IP address. +There is one possible option, &`defer_ok`&. If this is present and a +DNS operation returns a temporary error, the verify condition succeeds. + If this condition is used for a locally generated message (that is, when there is no client host involved), it always succeeds. @@ -28177,9 +29300,15 @@ deny dnslists = blackholes.mail-abuse.org warn message = X-Warn: sending host is on dialups list dnslists = dialups.mail-abuse.org .endd -DNS list lookups are cached by Exim for the duration of the SMTP session, +.cindex cacheing "of dns lookup" +.cindex DNS TTL +DNS list lookups are cached by Exim for the duration of the SMTP session +.new +(but limited by the DNS return TTL value), +.wen so a lookup based on the IP address is done at most once for any incoming -connection. Exim does not share information between multiple incoming +connection (assuming long-enough TTL). +Exim does not share information between multiple incoming connections (but your local name server cache should be active). @@ -28594,6 +29723,13 @@ deny condition = ${if isip4{$sender_host_address}} dnslists = some.list.example .endd +If an explicit key is being used for a DNS lookup and it may be an IPv6 +address you should specify alternate list separators for both the outer +(DNS list name) list and inner (lookup keys) list: +.code + dnslists = <; dnsbl.example.com/<|$acl_m_addrslist +.endd + .section "Rate limiting incoming messages" "SECTratelimiting" .cindex "rate limiting" "client sending" .cindex "limiting client sending rates" @@ -28685,7 +29821,7 @@ The &%per_rcpt%& option causes Exim to limit the rate at which recipients are accepted. It can be used in the &%acl_smtp_rcpt%&, &%acl_smtp_predata%&, &%acl_smtp_mime%&, &%acl_smtp_data%&, or &%acl_smtp_rcpt%& ACLs. In &%acl_smtp_rcpt%& the rate is updated one recipient at a time; in the other -ACLs the rate is updated with the total recipient count in one go. Note that +ACLs the rate is updated with the total (accepted) recipient count in one go. Note that in either case the rate limiting engine will see a message with many recipients as a large high-speed burst. @@ -28975,6 +30111,7 @@ router that does not set up hosts routes to an &(smtp)& transport with a &%hosts%& setting, the transport's hosts are used. If an &(smtp)& transport has &%hosts_override%& set, its hosts are always used, whether or not the router supplies a host list. +Callouts are only supported on &(smtp)& transports. The port that is used is taken from the transport, if it is specified and is a remote transport. (For routers that do verification only, no transport need be @@ -29628,10 +30765,12 @@ It supports a &"generic"& interface to scanners called via the shell, and specialized interfaces for &"daemon"& type virus scanners, which are resident in memory and thus are much faster. +A timeout of 2 minutes is applied to a scanner call (by default); +if it expires then a defer action is taken. .oindex "&%av_scanner%&" -You can set the &%av_scanner%& option in first part of the Exim configuration -file to specify which scanner to use, together with any additional options that +You can set the &%av_scanner%& option in the main part of the configuration +to specify which scanner to use, together with any additional options that are needed. The basic syntax is as follows: .display &`av_scanner = <`&&'scanner-type'&&`>:<`&&'option1'&&`>:<`&&'option2'&&`>:[...]`& @@ -29646,6 +30785,39 @@ The usual list-parsing of the content (see &<>&) applies. The following scanner types are supported in this release: .vlist +.vitem &%avast%& +.cindex "virus scanners" "avast" +This is the scanner daemon of Avast. It has been tested with Avast Core +Security (currently at version 1.1.7). +You can get a trial version at &url(http://www.avast.com) or for Linux +at &url(http://www.avast.com/linux-server-antivirus). +This scanner type takes one option, +which can be either a full path to a UNIX socket, +or host and port specifiers separated by white space. +The host may be a name or an IP address; the port is either a +single number or a pair of numbers with a dash between. +Any further options are given, on separate lines, +to the daemon as options before the main scan command. +For example: +.code +av_scanner = avast:/var/run/avast/scan.sock:FLAGS -fullfiles:SENSITIVITY -pup +av_scanner = avast:192.168.2.22 5036 +.endd +If you omit the argument, the default path +&_/var/run/avast/scan.sock_& +is used. +If you use a remote host, +you need to make Exim's spool directory available to it, +as the scanner is passed a file path, not file contents. +For information about available commands and their options you may use +.code +$ socat UNIX:/var/run/avast/scan.sock STDIO: + FLAGS + SENSITIVITY + PACK +.endd + + .vitem &%aveserver%& .cindex "virus scanners" "Kaspersky" This is the scanner daemon of Kaspersky Version 5. You can get a trial version @@ -29662,17 +30834,39 @@ av_scanner = aveserver:/var/run/aveserver This daemon-type scanner is GPL and free. You can get it at &url(http://www.clamav.net/). Some older versions of clamd do not seem to unpack MIME containers, so it used to be recommended to unpack MIME attachments -in the MIME ACL. This no longer believed to be necessary. One option is -required: either the path and name of a UNIX socket file, or a hostname or IP -number, and a port, separated by space, as in the second of these examples: +in the MIME ACL. This is no longer believed to be necessary. + +The options are a list of server specifiers, which may be +a UNIX socket specification, +a TCP socket specification, +or a (global) option. + +A socket specification consists of a space-separated list. +For a Unix socket the first element is a full path for the socket, +for a TCP socket the first element is the IP address +and the second a port number, +Any further elements are per-server (non-global) options. +These per-server options are supported: +.code +retry= Retry on connect fail +.endd + +The &`retry`& option specifies a time after which a single retry for +a failed connect is made. The default is to not retry. + +If a Unix socket file is specified, only one server is supported. + +Examples: .code av_scanner = clamd:/opt/clamd/socket av_scanner = clamd:192.0.2.3 1234 av_scanner = clamd:192.0.2.3 1234:local +av_scanner = clamd:192.0.2.3 1234 retry=10s av_scanner = clamd:192.0.2.3 1234 : 192.0.2.4 1234 .endd -If the value of av_scanner points to a UNIX socket file or contains the local -keyword, then the ClamAV interface will pass a filename containing the data +If the value of av_scanner points to a UNIX socket file or contains the +&`local`& +option, then the ClamAV interface will pass a filename containing the data to be scanned, which will should normally result in less I/O happening and be more efficient. Normally in the TCP case, the data is streamed to ClamAV as Exim does not assume that there is a common filesystem with the remote host. @@ -29734,9 +30928,13 @@ av_scanner = cmdline:\ .endd .vitem &%drweb%& .cindex "virus scanners" "DrWeb" -The DrWeb daemon scanner (&url(http://www.sald.com/)) interface takes one -argument, either a full path to a UNIX socket, or an IP address and port -separated by white space, as in these examples: +The DrWeb daemon scanner (&url(http://www.sald.com/)) interface +takes one option, +either a full path to a UNIX socket, +or host and port specifiers separated by white space. +The host may be a name or an IP address; the port is either a +single number or a pair of numbers with a dash between. +For example: .code av_scanner = drweb:/var/run/drwebd.sock av_scanner = drweb:192.168.2.20 31337 @@ -29744,6 +30942,17 @@ av_scanner = drweb:192.168.2.20 31337 If you omit the argument, the default path &_/usr/local/drweb/run/drwebd.sock_& is used. Thanks to Alex Miller for contributing the code for this scanner. +.vitem &%f-protd%& +.cindex "virus scanners" "f-protd" +The f-protd scanner is accessed via HTTP over TCP. +One argument is taken, being a space-separated hostname and port number +(or port-range). +For example: +.code +av_scanner = f-protd:localhost 10200-10204 +.endd +If you omit the argument, the default values show above are used. + .vitem &%fsecure%& .cindex "virus scanners" "F-Secure" The F-Secure daemon scanner (&url(http://www.f-secure.com)) takes one @@ -29778,6 +30987,24 @@ av_scanner = mksd:2 .endd You can safely omit this option (the default value is 1). +.vitem &%sock%& +.cindex "virus scanners" "simple socket-connected" +This is a general-purpose way of talking to simple scanner daemons +running on the local machine. +There are four options: +an address (which may be an IP address and port, or the path of a Unix socket), +a commandline to send (may include a single %s which will be replaced with +the path to the mail file to be scanned), +an RE to trigger on from the returned data, +an RE to extract malware_name from the returned data. +For example: +.code +av_scanner = sock:127.0.0.1 6001:%s:(SPAM|VIRUS):(.*)\$ +.endd +Default for the socket specifier is &_/tmp/malware.sock_&. +Default for the commandline is &_%s\n_&. +Both regular-expressions are required. + .vitem &%sophie%& .cindex "virus scanners" "Sophos and Sophie" Sophie is a daemon that uses Sophos' &%libsavi%& library to scan for viruses. @@ -29804,7 +31031,8 @@ which case each use of the &%malware%& condition causes a new scan of the message. The &%malware%& condition takes a right-hand argument that is expanded before -use. It can then be one of +use and taken as a list, slash-separated by default. +The first element can then be one of .ilist &"true"&, &"*"&, or &"1"&, in which case the message is scanned for viruses. @@ -29817,11 +31045,25 @@ the condition fails immediately. A regular expression, in which case the message is scanned for viruses. The condition succeeds if a virus is found and its name matches the regular expression. This allows you to take special actions on certain types of virus. +Note that &"/"& characters in the RE must be doubled due to the list-processing, +unless the separator is changed (in the usual way). .endlist -You can append &`/defer_ok`& to the &%malware%& condition to accept messages -even if there is a problem with the virus scanner. Otherwise, such a problem -causes the ACL to defer. +You can append a &`defer_ok`& element to the &%malware%& argument list to accept +messages even if there is a problem with the virus scanner. +Otherwise, such a problem causes the ACL to defer. + +You can append a &`tmo=`& element to the &%malware%& argument list to +specify a non-default timeout. The default is two minutes. +For example: +.code +malware = * / defer_ok / tmo=10s +.endd +A timeout causes the ACL to defer. + +.vindex "&$callout_address$&" +When a connection is made to the scanner the expansion variable &$callout_address$& +is set to record the actual address used. .vindex "&$malware_name$&" When a virus is found, the condition sets up an expansion variable called @@ -29865,14 +31107,20 @@ deny message = This message contains malware ($malware_name) .endd -.section "Scanning with SpamAssassin" "SECTscanspamass" +.section "Scanning with SpamAssassin and Rspamd" "SECTscanspamass" .cindex "content scanning" "for spam" .cindex "spam scanning" .cindex "SpamAssassin" +.cindex "Rspamd" The &%spam%& ACL condition calls SpamAssassin's &%spamd%& daemon to get a spam -score and a report for the message. You can get SpamAssassin at -&url(http://www.spamassassin.org), or, if you have a working Perl -installation, you can use CPAN by running: +score and a report for the message. +Support is also provided for Rspamd. + +For more information about installation and configuration of SpamAssassin or +Rspamd refer to their respective websites at +&url(http://spamassassin.apache.org) and &url(http://www.rspamd.com) + +SpamAssassin can be installed with CPAN by running: .code perl -MCPAN -e 'install Mail::SpamAssassin' .endd @@ -29881,42 +31129,96 @@ documentation to see how you can tweak it. The default installation should work nicely, however. .oindex "&%spamd_address%&" -After having installed and configured SpamAssassin, start the &%spamd%& daemon. -By default, it listens on 127.0.0.1, TCP port 783. If you use another host or -port for &%spamd%&, you must set the &%spamd_address%& option in the global -part of the Exim configuration as follows (example): +By default, SpamAssassin listens on 127.0.0.1, TCP port 783 and if you +intend to use an instance running on the local host you do not need to set +&%spamd_address%&. If you intend to use another host or port for SpamAssassin, +you must set the &%spamd_address%& option in the global part of the Exim +configuration as follows (example): .code spamd_address = 192.168.99.45 387 .endd -You do not need to set this option if you use the default. As of version 2.60, -&%spamd%& also supports communication over UNIX sockets. If you want to use -these, supply &%spamd_address%& with an absolute file name instead of a -address/port pair: + +To use Rspamd (which by default listens on all local addresses +on TCP port 11333) +you should add &%variant=rspamd%& after the address/port pair, for example: +.code +spamd_address = 127.0.0.1 11333 variant=rspamd +.endd + +As of version 2.60, &%SpamAssassin%& also supports communication over UNIX +sockets. If you want to us these, supply &%spamd_address%& with an absolute +file name instead of an address/port pair: .code spamd_address = /var/run/spamd_socket .endd You can have multiple &%spamd%& servers to improve scalability. These can reside on other hardware reachable over the network. To specify multiple &%spamd%& servers, put multiple address/port pairs in the &%spamd_address%& -option, separated with colons: +option, separated with colons (the separator can be changed in the usual way): .code spamd_address = 192.168.2.10 783 : \ 192.168.2.11 783 : \ 192.168.2.12 783 .endd -Up to 32 &%spamd%& servers are supported. The servers are queried in a random -fashion. When a server fails to respond to the connection attempt, all other +Up to 32 &%spamd%& servers are supported. +When a server fails to respond to the connection attempt, all other servers are tried until one succeeds. If no server responds, the &%spam%& condition defers. -&*Warning*&: It is not possible to use the UNIX socket connection method with -multiple &%spamd%& servers. +Unix and TCP socket specifications may be mixed in any order. +Each element of the list is a list itself, space-separated by default +and changeable in the usual way. + +For TCP socket specifications a host name or IP (v4 or v6, but +subject to list-separator quoting rules) address can be used, +and the port can be one or a dash-separated pair. +In the latter case, the range is tried in strict order. + +Elements after the first for Unix sockets, or second for TCP socket, +are options. +The supported options are: +.code +pri= Selection priority +weight= Selection bias +time=- Use only between these times of day +retry= Retry on connect fail +tmo= Connection time limit +variant=rspamd Use Rspamd rather than SpamAssassin protocol +.endd + +The &`pri`& option specifies a priority for the server within the list, +higher values being tried first. +The default priority is 1. + +The &`weight`& option specifies a selection bias. +Within a priority set +servers are queried in a random fashion, weighted by this value. +The default value for selection bias is 1. + +Time specifications for the &`time`& option are .. +in the local time zone; each element being one or more digits. +Either the seconds or both minutes and seconds, plus the leading &`.`& +characters, may be omitted and will be taken as zero. + +Timeout specifications for the &`retry`& and &`tmo`& options +are the usual Exim time interval standard, e.g. &`20s`& or &`1m`&. + +The &`tmo`& option specifies an overall timeout for communication. +The default value is two minutes. + +The &`retry`& option specifies a time after which a single retry for +a failed connect is made. +The default is to not retry. The &%spamd_address%& variable is expanded before use if it starts with a dollar sign. In this case, the expansion may return a string that is used as the list so that multiple spamd servers can be the result of an expansion. +.vindex "&$callout_address$&" +When a connection is made to the server the expansion variable &$callout_address$& +is set to record the actual address used. + .section "Calling SpamAssassin from an Exim ACL" "SECID206" Here is a simple example of the use of the &%spam%& condition in a DATA ACL: .code @@ -29927,14 +31229,21 @@ The right-hand side of the &%spam%& condition specifies a name. This is relevant if you have set up multiple SpamAssassin profiles. If you do not want to scan using a specific profile, but rather use the SpamAssassin system-wide default profile, you can scan for an unknown name, or simply use &"nobody"&. -However, you must put something on the right-hand side. +Rspamd does not use this setting. However, you must put something on the +right-hand side. The name allows you to use per-domain or per-user antispam profiles in principle, but this is not straightforward in practice, because a message may have multiple recipients, not necessarily all in the same domain. Because the -&%spam%& condition has to be called from a DATA ACL in order to be able to +&%spam%& condition has to be called from a DATA-time ACL in order to be able to read the contents of the message, the variables &$local_part$& and &$domain$& are not set. +Careful enforcement of single-recipient messages +(e.g. by responding with defer in the recipient ACL for all recipients +after the first), +or the use of PRDR, +.cindex "PRDR" "use for per-user SpamAssassin profiles" +are needed to use this feature. The right-hand side of the &%spam%& condition is expanded before being used, so you can put lookups or conditions there. When the right-hand side evaluates to @@ -29958,7 +31267,9 @@ it always return &"true"& by appending &`:true`& to the username. .cindex "spam scanning" "returned variables" When the &%spam%& condition is run, it sets up a number of expansion -variables. These variables are saved with the received message, thus they are +variables. +Except for &$spam_report$&, +these variables are saved with the received message so are available for use at delivery time. .vlist @@ -29976,11 +31287,19 @@ The integer value is useful for numeric comparisons in conditions. A string consisting of a number of &"+"& or &"-"& characters, representing the integer part of the spam score value. A spam score of 4.4 would have a &$spam_bar$& value of &"++++"&. This is useful for inclusion in warning -headers, since MUAs can match on such strings. +headers, since MUAs can match on such strings. The maximum length of the +spam bar is 50 characters. .vitem &$spam_report$& A multiline text table, containing the full SpamAssassin report for the message. Useful for inclusion in headers or reject messages. +This variable is only usable in a DATA-time ACL. + +.vitem &$spam_action$& +For SpamAssassin either 'reject' or 'no action' depending on the +spam score versus threshold. +For Rspamd, the recommended action. + .endlist The &%spam%& condition caches its results unless expansion in @@ -30166,7 +31485,10 @@ containing the decoded data. This is perhaps the most important of the MIME variables. It contains a proposed filename for an attachment, if one was found in either the &'Content-Type:'& or &'Content-Disposition:'& headers. The filename will be -RFC2047 decoded, but no additional sanity checks are done. If no filename was +RFC2047 +or RFC2231 +decoded, but no additional sanity checks are done. + If no filename was found, this variable contains the empty string. .vitem &$mime_is_coverletter$& @@ -30255,6 +31577,8 @@ deny message = contains blacklisted regex ($regex_match_string) The conditions returns true if any one of the regular expressions matches. The &$regex_match_string$& expansion variable is then set up and contains the matching regular expression. +The expansion variables &$regex1$& &$regex2$& etc +are set to any substrings captured by the regular expression. &*Warning*&: With large messages, these conditions can be fairly CPU-intensive. @@ -31900,7 +33224,7 @@ they do not affect the values of the variables that refer to header lines. the transport cannot refer to the modified header lines, because such expansions all occur before the message is actually transported. -For both routers and transports, the result of expanding a &%headers_add%& +For both routers and transports, the argument of a &%headers_add%& option must be in the form of one or more RFC 2822 header lines, separated by newlines (coded as &"\n"&). For example: .code @@ -31910,10 +33234,10 @@ headers_add = X-added-header: added by $primary_hostname\n\ Exim does not check the syntax of these added header lines. Multiple &%headers_add%& options for a single router or transport can be -specified; the values will be concatenated (with a separating newline -added) before expansion. +specified; the values will append to a single list of header lines. +Each header-line is separately expanded. -The result of expanding &%headers_remove%& must consist of a colon-separated +The argument of a &%headers_remove%& option must consist of a colon-separated list of header names. This is confusing, because header names themselves are often terminated by colons. In this case, the colons are the list separators, not part of the names. For example: @@ -31922,11 +33246,15 @@ headers_remove = return-receipt-to:acknowledge-to .endd Multiple &%headers_remove%& options for a single router or transport can be -specified; the values will be concatenated (with a separating colon -added) before expansion. - -When &%headers_add%& or &%headers_remove%& is specified on a router, its value -is expanded at routing time, and then associated with all addresses that are +specified; the arguments will append to a single header-names list. +Each item is separately expanded. +Note that colons in complex expansions which are used to +form all or part of a &%headers_remove%& list +will act as list separators. + +When &%headers_add%& or &%headers_remove%& is specified on a router, +items are expanded at routing time, +and then associated with all addresses that are accepted by that router, and also with any new addresses that it generates. If an address passes through several routers as a result of aliasing or forwarding, the changes are cumulative. @@ -32760,13 +34088,8 @@ failing addresses with their error messages. The third item is used to introduce any text from pipe transports that is to be returned to the sender. It is omitted if there is no such text. .next -The fourth item is used to introduce the copy of the message that is returned -as part of the error report. -.next -The fifth item is added after the fourth one if the returned message is -truncated because it is bigger than &%return_size_limit%&. -.next -The sixth item is added after the copy of the original message. +The fourth, fifth and sixth items will be ignored and may be empty. +The fields exist for back-compatibility .endlist The default state (&%bounce_message_file%& unset) is equivalent to the @@ -33603,8 +34926,9 @@ equivalent to the setting: .code log_file_path = $spool_directory/log/%slog .endd -If you do not specify anything at build time or run time, that is where the -logs are written. +If you do not specify anything at build time or run time, +or if you unset the option at run time (i.e. &`log_file_path = `&), +that is where the logs are written. A log file path may also contain &`%D`& or &`%M`& if datestamped log file names are in use &-- see section &<>& below. @@ -33873,7 +35197,7 @@ data when a message is received. See section &<>& below. .cindex "log" "delivery line" The format of the single-line entry in the main log that is written for every delivery is shown in one of the examples below, for local and remote -deliveries, respectively. Each example has been split into two lines in order +deliveries, respectively. Each example has been split into multiple lines in order to fit it on the page: .code 2002-10-31 08:59:13 16ZCW1-0005MB-00 => marv @@ -34024,6 +35348,7 @@ the following table: &`R `& on &`<=`& lines: reference for local bounce &` `& on &`=>`& &`**`& and &`==`& lines: router name &`S `& size of message +&`SNI `& server name indication from TLS client hello &`ST `& shadow transport name &`T `& on &`<=`& lines: message subject (topic) &` `& on &`=>`& &`**`& and &`==`& lines: transport name @@ -34103,9 +35428,12 @@ selection marked by asterisks: &`*etrn `& ETRN commands &`*host_lookup_failed `& as it says &` ident_timeout `& timeout for ident connection -&` incoming_interface `& incoming interface on <= lines -&` incoming_port `& incoming port on <= lines +&` incoming_interface `& local interface on <= and => lines +&` incoming_port `& remote port on <= lines &`*lost_incoming_connection `& as it says (includes timeouts) +.new +&` outgoing_interface `& local interface on => lines +.wen &` outgoing_port `& add remote port to => lines &`*queue_run `& start and end queue runs &` queue_time `& time on queue for one recipient @@ -34121,14 +35449,14 @@ selection marked by asterisks: &`*size_reject `& rejection because too big &`*skip_delivery `& delivery skipped in a queue run &`*smtp_confirmation `& SMTP confirmation on => lines -&` smtp_connection `& SMTP connections +&` smtp_connection `& incoming SMTP connections &` smtp_incomplete_transaction`& incomplete SMTP transactions &` smtp_mailauth `& AUTH argument to MAIL commands &` smtp_no_mail `& session with no MAIL commands &` smtp_protocol_error `& SMTP protocol errors &` smtp_syntax_error `& SMTP syntax errors &` subject `& contents of &'Subject:'& on <= lines -&` tls_certificate_verified `& certificate verification status +&`*tls_certificate_verified `& certificate verification status &`*tls_cipher `& TLS cipher suite on <= and => lines &` tls_peerdn `& TLS peer DN on <= and => lines &` tls_sni `& TLS SNI on <= lines @@ -34136,6 +35464,9 @@ selection marked by asterisks: &` all `& all of the above .endd +See also the &%slow_lookup_log%& main configuration option, +section &<>& + More details on each of these items follows: .ilist @@ -34221,12 +35552,18 @@ routing email addresses, but it does apply to &"byname"& lookups. client's ident port times out. .next .cindex "log" "incoming interface" +.cindex "log" "local interface" +.cindex "log" "local address and port" +.cindex "TCP/IP" "logging local address and port" .cindex "interface" "logging" &%incoming_interface%&: The interface on which a message was received is added to the &"<="& line as an IP address in square brackets, tagged by I= and followed by a colon and the port number. The local interface and port are also -added to other SMTP log lines, for example &"SMTP connection from"&, and to -rejection lines. +added to other SMTP log lines, for example &"SMTP connection from"&, to +rejection lines, and (despite the name) to outgoing &"=>"& and &"->"& lines. +.new +The latter can be disabled by turning off the &%outgoing_interface%& option. +.wen .next .cindex "log" "incoming remote port" .cindex "port" "logging remote" @@ -34244,13 +35581,30 @@ important with the widening use of NAT (see RFC 2505). &%lost_incoming_connection%&: A log line is written when an incoming SMTP connection is unexpectedly dropped. .next +.cindex "log" "outgoing interface" +.cindex "log" "local interface" +.cindex "log" "local address and port" +.cindex "TCP/IP" "logging local address and port" +.cindex "interface" "logging" +.new +&%outgoing_interface%&: If &%incoming_interface%& is turned on, then the +interface on which a message was sent is added to delivery lines as an I= tag +followed by IP address in square brackets. You can disable this by turning +off the &%outgoing_interface%& option. +.wen +.next .cindex "log" "outgoing remote port" .cindex "port" "logging outgoint remote" .cindex "TCP/IP" "logging ougtoing remote port" &%outgoing_port%&: The remote port number is added to delivery log lines (those -containing => tags) following the IP address. This option is not included in -the default setting, because for most ordinary configurations, the remote port -number is always 25 (the SMTP port). +containing => tags) following the IP address. +.new +The local port is also added if &%incoming_interface%& and +&%outgoing_interface%& are both enabled. +.wen +This option is not included in the default setting, because for most ordinary +configurations, the remote port number is always 25 (the SMTP port), and the +local port is a random ephemeral port. .next .cindex "log" "process ids in" .cindex "pid (process id)" "in log lines" @@ -34333,14 +35687,15 @@ The message that is written is &"spool file is locked"&. .next .cindex "log" "smtp confirmation" .cindex "SMTP" "logging confirmation" -&%smtp_confirmation%&: The response to the final &"."& in the SMTP dialogue for +.cindex "LMTP" "logging confirmation" +&%smtp_confirmation%&: The response to the final &"."& in the SMTP or LMTP dialogue for outgoing messages is added to delivery log lines in the form &`C=`&<&'text'&>. A number of MTAs (including Exim) return an identifying string in this response. .next .cindex "log" "SMTP connections" .cindex "SMTP" "logging connections" -&%smtp_connection%&: A log line is written whenever an SMTP connection is +&%smtp_connection%&: A log line is written whenever an incoming SMTP connection is established or closed, unless the connection is from a host that matches &%hosts_connection_nolog%&. (In contrast, &%lost_incoming_connection%& applies only when the closure is unexpected.) This applies to connections from local @@ -34389,7 +35744,7 @@ C=EHLO,QUIT shows that the client issued QUIT straight after EHLO. If there were fewer than 20 commands, they are all listed. If there were more than 20 commands, the last 20 are listed, preceded by &"..."&. However, with the default -setting of 10 for &%smtp_accep_max_nonmail%&, the connection will in any case +setting of 10 for &%smtp_accept_max_nonmail%&, the connection will in any case have been aborted before 20 non-mail commands are processed. .next &%smtp_mailauth%&: A third subfield with the authenticated sender, @@ -34562,9 +35917,15 @@ This utility is a Perl script contributed by Matt Hubbard. It runs .code exim -bpu .endd -to obtain a queue listing with undelivered recipients only, and then greps the -output to select messages that match given criteria. The following selection -options are available: +or (in case &*-a*& switch is specified) +.code +exim -bp +.endd +The &*-C*& option is used to specify an alternate &_exim.conf_& which might +contain alternate exim configuration the queue management might be using. + +to obtain a queue listing, and then greps the output to select messages +that match given criteria. The following selection options are available: .vlist .vitem &*-f*&&~<&'regex'&> @@ -34574,7 +35935,7 @@ tested is enclosed in angle brackets, so you can test for bounce messages with exiqgrep -f '^<>$' .endd .vitem &*-r*&&~<&'regex'&> -Match a recipient address using a case-insensitve search. The field that is +Match a recipient address using a case-insensitive search. The field that is tested is not enclosed in angle brackets. .vitem &*-s*&&~<&'regex'&> @@ -34611,6 +35972,9 @@ Brief format &-- one line per message. .vitem &*-R*& Display messages in reverse order. + +.vitem &*-a*& +Include delivered recipients in queue listing. .endlist There is one more option, &%-h%&, which outputs a list of options. @@ -34666,7 +36030,7 @@ The input files can be in Exim log format or syslog format. If a matching log line is not associated with a specific message, it is included in &'exigrep'&'s output without any additional lines. The usage is: .display -&`exigrep [-t<`&&'n'&&`>] [-I] [-l] [-v] <`&&'pattern'&&`> [<`&&'log file'&&`>] ...`& +&`exigrep [-t<`&&'n'&&`>] [-I] [-l] [-M] [-v] <`&&'pattern'&&`> [<`&&'log file'&&`>] ...`& .endd If no log file names are given on the command line, the standard input is read. @@ -34687,9 +36051,24 @@ regular expression. The &%-v%& option inverts the matching condition. That is, a line is selected if it does &'not'& match the pattern. +The &%-M%& options means &"related messages"&. &'exigrep'& will show messages +that are generated as a result/response to a message that &'exigrep'& matched +normally. + +Example of &%-M%&: +user_a sends a message to user_b, which generates a bounce back to user_b. If +&'exigrep'& is used to search for &"user_a"&, only the first message will be +displayed. But if &'exigrep'& is used to search for &"user_b"&, the first and +the second (bounce) message will be displayed. Using &%-M%& with &'exigrep'& +when searching for &"user_a"& will show both messages since the bounce is +&"related"& to or a &"result"& of the first message that was found by the +search term. + If the location of a &'zcat'& command is known from the definition of ZCAT_COMMAND in &_Local/Makefile_&, &'exigrep'& automatically passes any file whose name ends in COMPRESS_SUFFIX through &'zcat'& as it searches it. +If the ZCAT_COMMAND is not executable, &'exigrep'& tries to use +autodetection of some well known compression extensions. .section "Selecting messages by various criteria (exipick)" "SECTexipick" @@ -34969,6 +36348,9 @@ Serializing ETRN runs (when &%smtp_etrn_serialize%& is set) .next Serializing delivery to a specific host (when &%serialize_hosts%& is set in an &(smtp)& transport) +.next +Limiting the concurrency of specific transports (when &%max_parallel%& is set +in a transport) .endlist @@ -35829,7 +37211,7 @@ Such invocations should be viewed with prejudicial suspicion. Administrators who use embedded Perl are advised to explore how Perl's taint checking might apply to their usage. .next -Use of &%${expand...}%& is somewhat analagous to shell's eval builtin and +Use of &%${expand...}%& is somewhat analogous to shell's eval builtin and administrators are well advised to view its use with suspicion, in case (for instance) it allows a local-part to contain embedded Exim directives. .next @@ -36444,7 +37826,7 @@ Verification of DKIM signatures in incoming email is implemented via the &%acl_smtp_dkim%& ACL. By default, this ACL is called once for each syntactically(!) correct signature in the incoming message. A missing ACL definition defaults to accept. -If any ACL call does not acccept, the message is not accepted. +If any ACL call does not accept, the message is not accepted. If a cutthrough delivery was in progress for the message it is summarily dropped (having wasted the transmission effort). @@ -36508,7 +37890,7 @@ available in &%$dkim_verify_reason%&. &%pass%&: The signature passed verification. It is valid. .endlist .vitem &%$dkim_verify_reason%& -A string giving a litte bit more detail when &%$dkim_verify_status%& is either +A string giving a little bit more detail when &%$dkim_verify_status%& is either "fail" or "invalid". One of .ilist &%pubkey_unavailable%& (when &%$dkim_verify_status%&="invalid"): The public