The next two lines are concerned with &'ident'& callbacks, as defined by RFC
1413 (hence their names):
-.new
.code
rfc1413_hosts = *
rfc1413_query_timeout = 0s
.endd
-.wen
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
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.
+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:
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.
+.new
+Any commas in attribute values are doubled
+(permitting treatment of the values as a comma-separated list).
+.wen
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.
&%attr1%& has two values, 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.
+.new
+The &%listextract%& operator should be used to pick out individual values
+of attributes, even when only a single value is expected.
+.wen
Exim filter files include an &%if%& command with its own regular expression
matching condition.
-.new
.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.
-.wen
.vitem "&$acl_c...$&"
Values can be placed in these variables by the &%set%& modifier in an ACL. They
and can be accessed by filters, routers, and transports during subsequent
delivery.
-.new
.vitem &$acl_narg$&
Within an acl condition, expansion condition or expansion item
this variable has the number of arguments.
-.wen
.vitem &$acl_verify_message$&
.vindex "&$acl_verify_message$&"
.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 "&$inode$&"
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 "&$message_linecount$&"
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%& or &%sha1%& operator,
+.new
+&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
+.wen
or a &%def%& condition.
.vitem &$tls_in_peercert$&
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%& or &%sha1%& operator,
+.new
+&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
+.wen
or a &%def%& condition.
.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%& or &%sha1%& operator,
+.new
+&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
+.wen
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%& or &%sha1%& operator,
+.new
+&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
+.wen
or a &%def%& condition.
.vitem &$tls_in_certificate_verified$&
&<<CHAPTLS>>& for details of TLS support and chapter &<<CHAPsmtptrans>>& for
details of the &(smtp)& transport.
-.new
.vitem &$tls_in_ocsp$&
.vindex "&$tls_in_ocsp$&"
When a message is received from a remote client connection
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.
-.wen
.vitem &$tls_in_peerdn$&
.vindex "&$tls_in_peerdn$&"
of the other precondition options are common special cases that could in fact
be specified using &%condition%&.
+.new
+When originally designed, Exim's ACL system enforced very strict parsing
+of the &%condition%& expansion everywhere it was being processed.
+Through the 4.7x release cycle, the &%condition%& processing while in a
+router became more loose, internally adopting the use of &%bool_lax%&
+instead of the more rigid &%bool%&. This is best illustrated in an
+example:
+.code
+# This used to fail with a syntax error, now it
+# treats any extra characters 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 ACL parser only looks for &"{"& symbols when they
+mean something, like after a &"$"& or when required as part of a
+conditional. But otherwise &"{"& and &"}"& are treated as ordinary
+string characters.
+.wen
+
.option debug_print routers string&!! unset
.cindex "testing" "variables in drivers"
.scindex IIDdcotauth2 "authenticators" "&(dovecot)&"
This authenticator is an interface to the authentication facility of the
Dovecot POP/IMAP server, which can support a number of authentication methods.
-.new
Note that Dovecot must be configured to use auth-client not auth-userdb.
-.wen
If you are using Dovecot to authenticate POP/IMAP clients, it might be helpful
to use the same mechanisms for SMTP authentication. This is a server
authenticator only. There is only one option:
Note that the proof only covers the terminal server certificate,
not any of the chain from CA to it.
-.new
There is no current way to staple a proof for a client certificate.
-.wen
.code
A helper script "ocsp_fetch.pl" for fetching a proof from a CA
response.
.vindex "&$acl_verify_message$&"
+.new
+For ACLs that are called by an &%acl =%& ACL condition, the message is
+stored in &$acl_verify_message$&, from which the calling ACL may use it.
+.wen
+
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
git://git.exim.org / exim.git / blobdiff