channel binding notes

[users/heiko/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index f09e0253b75310dbbbc847b16d641ea59f3b7e8a..4c79e87cf81aae44eb0bbd798ddd53f058d7ee79 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -3885,7 +3885,9 @@ id, and the remaining ones must be email addresses. However, if the message is
 active (in the middle of a delivery attempt), it is not altered. This option
 can be used only by an admin user.
 
 active (in the middle of a delivery attempt), it is not altered. This option
 can be used only by an admin user.
 

-.vitem "&%-MC%&&~<&'transport'&>&~<&'hostname'&>&~<&'sequence&~number'&>&&&
+.vitem "&%-MC%&&~<&'transport'&>&~<&'hostname'&>&&&
+       &~<&'host&~IP'&>&&&
+       &~<&'sequence&~number'&>&&&

         &~<&'message&~id'&>"
 .oindex "&%-MC%&"
 .cindex "SMTP" "passed connection"
         &~<&'message&~id'&>"
 .oindex "&%-MC%&"
 .cindex "SMTP" "passed connection"


@@ -10147,7 +10149,7 @@ newline at the very end. For the &%header%& and &%bheader%& expansion, for
 those headers that contain lists of addresses, a comma is also inserted at the
 junctions between headers. This does not happen for the &%rheader%& expansion.
 
 those headers that contain lists of addresses, a comma is also inserted at the
 junctions between headers. This does not happen for the &%rheader%& expansion.
 

-.cindex "tainted data"
+.cindex "tainted data" "message headers"

 When the headers are from an incoming message,
 the result of expanding any of these variables is tainted.
 
 When the headers are from an incoming message,
 the result of expanding any of these variables is tainted.
 


@@ -13703,7 +13705,11 @@ filter file to set values that can be tested in users' filter files. For
 example, a system filter could set a value indicating how likely it is that a
 message is junk mail.
 
 example, a system filter could set a value indicating how likely it is that a
 message is junk mail.
 

-.vitem &$spam_$&&'xxx'&
+.vitem &$spam_score$& &&&
+       &$spam_score_int$& &&&
+       &$spam_bar$& &&&
+       &$spam_report$& &&&
+       &$spam_action$&

 A number of variables whose names start with &$spam$& are available when Exim
 is compiled with the content-scanning extension. For details, see section
 &<<SECTscanspamass>>&.
 A number of variables whose names start with &$spam$& are available when Exim
 is compiled with the content-scanning extension. For details, see section
 &<<SECTscanspamass>>&.


@@ -14093,6 +14099,10 @@ taint mode of the Perl interpreter. You are encouraged to set this
 option to a true value. To avoid breaking existing installations, it
 defaults to false.
 
 option to a true value. To avoid breaking existing installations, it
 defaults to false.
 

+.new
+&*Note*&: This is entirely separate from Exim's tainted-data tracking.
+.wen
+

 
 .section "Calling Perl subroutines" "SECID86"
 When the configuration file includes a &%perl_startup%& option you can make use
 
 .section "Calling Perl subroutines" "SECID86"
 When the configuration file includes a &%perl_startup%& option you can make use


@@ -16973,7 +16983,7 @@ not count as protocol errors (see &%smtp_max_synprot_errors%&).
 .option pipelining_connect_advertise_hosts main "host list&!!" *
 .cindex "pipelining" "early connection"
 .cindex "pipelining" PIPE_CONNECT
 .option pipelining_connect_advertise_hosts main "host list&!!" *
 .cindex "pipelining" "early connection"
 .cindex "pipelining" PIPE_CONNECT

-.cindex "ESMTP extensions" X_PIPE_CONNECT
+.cindex "ESMTP extensions" PIPE_CONNECT

 If Exim is built with the SUPPORT_PIPE_CONNECT build option
 this option controls which hosts the facility is advertised to
 and from which pipeline early-connection (before MAIL) SMTP
 If Exim is built with the SUPPORT_PIPE_CONNECT build option
 this option controls which hosts the facility is advertised to
 and from which pipeline early-connection (before MAIL) SMTP


@@ -16982,7 +16992,9 @@ When used, the pipelining saves on roundtrip times.
 
 See also the &%hosts_pipe_connect%& smtp transport option.
 
 
 See also the &%hosts_pipe_connect%& smtp transport option.
 

-Currently the option name &"X_PIPE_CONNECT"& is used.
+.new
+The SMTP service extension keyword advertised is &"PIPE_CONNECT"&.
+.wen

 
 
 .option prdr_enable main boolean false
 
 
 .option prdr_enable main boolean false


@@ -19720,6 +19732,10 @@ Values containing a list-separator should have them doubled.
 When a router runs, the strings are evaluated in order,
 to create variables which are added to the set associated with
 the address.
 When a router runs, the strings are evaluated in order,
 to create variables which are added to the set associated with
 the address.

+.new
+This is done immediately after all the preconditions, before the
+evaluation of the &%address_data%& option.
+.wen

 The variable is set with the expansion of the value.
 The variables can be used by the router options
 (not including any preconditions)
 The variable is set with the expansion of the value.
 The variables can be used by the router options
 (not including any preconditions)


@@ -25524,9 +25540,12 @@ incoming messages, use an appropriate ACL.
 .cindex "authentication" "optional in client"
 This option provides a list of servers to which, provided they announce
 authentication support, Exim will attempt to authenticate as a client when it
 .cindex "authentication" "optional in client"
 This option provides a list of servers to which, provided they announce
 authentication support, Exim will attempt to authenticate as a client when it

-connects. If authentication fails, Exim will try to transfer the message
-unauthenticated. See also &%hosts_require_auth%&, and chapter
-&<<CHAPSMTPAUTH>>& for details of authentication.
+connects. If authentication fails
+.new
+and &%hosts_require_auth%& permits,
+.wen
+Exim will try to transfer the message unauthenticated.
+See also chapter &<<CHAPSMTPAUTH>>& for details of authentication.

 
 .option hosts_try_chunking smtp "host list&!!" *
 .cindex CHUNKING "enabling, in client"
 
 .option hosts_try_chunking smtp "host list&!!" *
 .cindex CHUNKING "enabling, in client"


@@ -27355,7 +27374,7 @@ conditions:
 .ilist
 The client host must match &%auth_advertise_hosts%& (default *).
 .next
 .ilist
 The client host must match &%auth_advertise_hosts%& (default *).
 .next

-It the &%server_advertise_condition%& option is set, its expansion must not
+If the &%server_advertise_condition%& option is set, its expansion must not

 yield the empty string, &"0"&, &"no"&, or &"false"&.
 .endlist
 
 yield the empty string, &"0"&, &"no"&, or &"false"&.
 .endlist
 


@@ -27463,7 +27482,7 @@ encode '\0user@domain.com\0pas$$word'
 .endd
 gives an incorrect answer because of the unescaped &"@"& and &"$"& characters.
 
 .endd
 gives an incorrect answer because of the unescaped &"@"& and &"$"& characters.
 

-If you have the &%mimencode%& command installed, another way to do produce
+If you have the &%mimencode%& command installed, another way to produce

 base64-encoded strings is to run the command
 .code
 echo -e -n `\0user\0password' | mimencode
 base64-encoded strings is to run the command
 .code
 echo -e -n `\0user\0password' | mimencode


@@ -28162,6 +28181,10 @@ supplied by the server.
 .option server_channelbinding gsasl boolean false
 Do not set this true and rely on the properties
 without consulting a cryptographic engineer.
 .option server_channelbinding gsasl boolean false
 Do not set this true and rely on the properties
 without consulting a cryptographic engineer.

+. Unsure what that's about.  It might be the "Triple Handshake"
+. vulnerability; cf. https://www.mitls.org/pages/attacks/3SHAKE
+. If so, we're ok, requiring Extended Master Secret if TLS
+. Session Resumption was used.

 
 Some authentication mechanisms are able to use external context at both ends
 of the session to bind the authentication to that context, and fail the
 
 Some authentication mechanisms are able to use external context at both ends
 of the session to bind the authentication to that context, and fail the


@@ -38293,8 +38316,11 @@ parentheses afterwards.
 When more than one address is included in a single delivery (for example, two
 SMTP RCPT commands in one transaction) the second and subsequent addresses are
 flagged with &`->`& instead of &`=>`&. When two or more messages are delivered
 When more than one address is included in a single delivery (for example, two
 SMTP RCPT commands in one transaction) the second and subsequent addresses are
 flagged with &`->`& instead of &`=>`&. When two or more messages are delivered

-down a single SMTP connection, an asterisk follows the IP address in the log
-lines for the second and subsequent messages.
+down a single SMTP connection, an asterisk follows the
+.new
+remote IP address (and port if enabled)
+.wen
+in the log lines for the second and subsequent messages.

 When two or more messages are delivered down a single TLS connection, the
 DNS and some TLS-related information logged for the first message delivered
 will not be present in the log lines for the second and subsequent messages.
 When two or more messages are delivered down a single TLS connection, the
 DNS and some TLS-related information logged for the first message delivered
 will not be present in the log lines for the second and subsequent messages.


@@ -38661,6 +38687,7 @@ routing email addresses, but it does apply to &"byname"& lookups.
 client's ident port times out.
 .next
 .cindex "log" "incoming interface"
 client's ident port times out.
 .next
 .cindex "log" "incoming interface"

+.cindex "log" "outgoing interface"

 .cindex "log" "local interface"
 .cindex "log" "local address and port"
 .cindex "TCP/IP" "logging local address and port"
 .cindex "log" "local interface"
 .cindex "log" "local address and port"
 .cindex "TCP/IP" "logging local address and port"


@@ -38669,7 +38696,10 @@ client's ident port times out.
 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"&, to
 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"&, to

-rejection lines, and (despite the name) to outgoing &"=>"& and &"->"& lines.
+rejection lines, and (despite the name) to outgoing
+.new
+&"=>"&, &"->"&, &"=="& and &"**"& lines.
+.wen

 The latter can be disabled by turning off the &%outgoing_interface%& option.
 .next
 .cindex log "incoming proxy address"
 The latter can be disabled by turning off the &%outgoing_interface%& option.
 .next
 .cindex log "incoming proxy address"