summaryrefslogtreecommitdiff
path: root/doc/doc-docbook/spec.xfpt
diff options
context:
space:
mode:
authorJeremy Harris <jgh146exb@wizmail.org>2017-12-19 21:54:37 +0000
committerJeremy Harris <jgh146exb@wizmail.org>2017-12-19 21:54:37 +0000
commit3721c5545411010ffbea82fc58b883664d07e865 (patch)
tree978e6ccdefef0c3ccf0bac8c0eb1df29d6aa1799 /doc/doc-docbook/spec.xfpt
parentd21bf202dbce10f259310dffcc6993f4d9886e56 (diff)
Docs: clean for next release
Diffstat (limited to 'doc/doc-docbook/spec.xfpt')
-rw-r--r--doc/doc-docbook/spec.xfpt80
1 files changed, 1 insertions, 79 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index f2709418e..48cb0155e 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -45,7 +45,7 @@
. Update the Copyright year (only) when changing content.
. /////////////////////////////////////////////////////////////////////////////
-.set previousversion "4.89"
+.set previousversion "4.90"
.include ./local_params
.set ACL "access control lists (ACLs)"
@@ -2791,12 +2791,10 @@ files or databases you are using, you must exit and restart Exim before trying
the same lookup again. Otherwise, because each Exim process caches the results
of lookups, you will just get the same result as before.
-.new
Macro processing is done on lines before string-expansion: new macros can be
defined and macros will be expanded.
Because macros in the config file are often used for secrets, those are only
available to admin users.
-.wen
.vitem &%-bem%&&~<&'filename'&>
.oindex "&%-bem%&"
@@ -3867,14 +3865,12 @@ This option is not intended for use by external callers. It is used internally
by Exim in conjunction with the &%-MC%& option, and passes on the fact that the
host to which Exim is connected supports TLS encryption.
-.new
.vitem &%-MCt%&&~<&'IP&~address'&>&~<&'port'&>&~<&'cipher'&>
.oindex "&%-MCt%&"
This option is not intended for use by external callers. It is used internally
by Exim in conjunction with the &%-MC%& option, and passes on the fact that the
connection is being proxied by a parent process for handling TLS encryption.
The arguments give the local address and port being proxied, and the TLS cipher.
-.wen
.vitem &%-Mc%&&~<&'message&~id'&>&~<&'message&~id'&>&~...
.oindex "&%-Mc%&"
@@ -11050,12 +11046,10 @@ colon-separated components are permitted, each containing from one to four
hexadecimal digits. There may be fewer than eight components if an empty
component (adjacent colons) is present. Only one empty component is permitted.
-.new
&*Note*&: The checks used to be just on the form of the address; actual numerical
values were not considered. Thus, for example, 999.999.999.999 passed the IPv4
check.
This is no longer the case.
-.wen
The main use of these tests is to distinguish between IP addresses and
host names, or between IPv4 and IPv6 addresses. For example, you could use
@@ -12089,9 +12083,7 @@ when the ACL &%malware%& condition is true (see section &<<SECTscanvirus>>&).
This variable contains the number of bytes in the longest line that was
received as part of the message, not counting the line termination
character(s).
-.new
It is not valid if the &%spool_files_wireformat%& option is used.
-.wen
.vitem &$message_age$&
.cindex "message" "age of"
@@ -12134,11 +12126,9 @@ in bytes. The count starts from the character after the blank line that
separates the body from the header. Newlines are included in the count. See
also &$message_size$&, &$body_linecount$&, and &$body_zerocount$&.
-.new
If the spool file is wireformat
(see the &%spool_files_wireformat%& main option)
the CRLF line-terminators are included in the count.
-.wen
.vitem &$message_exim_id$&
.vindex "&$message_exim_id$&"
@@ -12190,9 +12180,7 @@ deny message = Too many lines in message header
In the MAIL and RCPT ACLs, the value is zero because at that stage the
message has not yet been received.
-.new
This variable is not valid if the &%spool_files_wireformat%& option is used.
-.wen
.vitem &$message_size$&
.cindex "size" "of message"
@@ -12814,14 +12802,12 @@ argument, that is, the text that follows the command name, with leading white
space removed. Following the introduction of &$smtp_command$&, this variable is
somewhat redundant, but is retained for backwards compatibility.
-.new
.vitem &$smtp_command_history$&
.cindex SMTP "command history"
.vindex "&$smtp_command_history$&"
A comma-separated list (with no whitespace) of the most-recent SMTP commands
received, in time-order left to right. Only a limited number of commands
are remembered.
-.wen
.vitem &$smtp_count_at_connection_start$&
.vindex "&$smtp_count_at_connection_start$&"
@@ -12909,10 +12895,8 @@ It is only useful as the argument of a
&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
or a &%def%& condition.
-.new
&*Note*&: Under current versions of OpenSSL, when a list of more than one
file is used for &%tls_certificate%&, this variable is not reliable.
-.wen
.vitem &$tls_in_peercert$&
.vindex "&$tls_in_peercert$&"
@@ -14498,13 +14482,11 @@ The CHUNKING extension (RFC3030) will be advertised in the EHLO message to
these hosts.
Hosts may use the BDAT command as an alternate to DATA.
-.new
.option commandline_checks_require_admin main boolean &`false`&
.cindex "restricting access to features"
This option restricts various basic checking features to require an
administrative user.
This affects most of the &%-b*%& options, such as &%-be%&.
-.wen
.option debug_store main boolean &`false`&
.cindex debugging "memory corruption"
@@ -16883,7 +16865,6 @@ as failures in the configuration file.
By using this option to override the compiled-in path, it is possible to run
tests of Exim without using the standard spool.
-.new
.option spool_wireformat main boolean false
.cindex "spool directory" "file formats"
If this option is set, Exim may for some messages use an alternate format
@@ -16907,7 +16888,6 @@ will need to be aware of the potential different format.
Using any of the ACL conditions noted will negate the reception benefit
(as a Unix-mbox-format file is contructed for them).
The transimssion benefit is maintained.
-.wen
.option sqlite_lock_timeout main time 5s
.cindex "sqlite lookup type" "lock timeout"
@@ -17118,11 +17098,9 @@ is not required the &%tls_advertise_hosts%& option should be set empty.
.option tls_certificate main string list&!! unset
.cindex "TLS" "server certificate; location of"
.cindex "certificate" "server, location of"
-.new
The value of this option is expanded, and must then be a list of absolute paths to
files which contains the server's certificates. Commonly only one file is
needed.
-.wen
The server's private key is also
assumed to be in this file if &%tls_privatekey%& is unset. See chapter
&<<CHAPTLS>>& for further details.
@@ -17132,7 +17110,6 @@ receiving incoming messages as a server. If you want to supply certificates for
use when sending messages as a client, you must set the &%tls_certificate%&
option in the relevant &(smtp)& transport.
-.new
&*Note*&: If you use filenames based on IP addresses, change the list
separator in the usual way to avoid confusion under IPv6.
@@ -17140,7 +17117,6 @@ separator in the usual way to avoid confusion under IPv6.
file is used, the &$tls_in_ourcert$& veriable is unreliable.
&*Note*&: OCSP stapling is not usable when a list of more than one file is used.
-.wen
If the option contains &$tls_out_sni$& and Exim is built against OpenSSL, then
if the OpenSSL build supports TLS extensions and the TLS client sends the
@@ -17281,10 +17257,8 @@ Certificate Authority.
Usable for GnuTLS 3.4.4 or 3.3.17 or OpenSSL 1.1.0 (or later).
-.new
&*Note*&: There is currently no support for multiple OCSP proofs to match the
multiple certificates facility.
-.wen
.option tls_on_connect_ports main "string list" unset
@@ -17299,10 +17273,8 @@ further details, see section &<<SECTsupobssmt>>&.
.option tls_privatekey main string list&!! unset
.cindex "TLS" "server private key; location of"
-.new
The value of this option is expanded, and must then be a list of absolute paths to
files which contains the server's private keys.
-.wen
If this option is unset, or if
the expansion is forced to fail, or the result is an empty string, the private
key is assumed to be in the same file as the server's certificates. See chapter
@@ -24089,7 +24061,6 @@ been started will not be passed to a new delivery process for sending another
message on the same connection. See section &<<SECTmulmessam>>& for an
explanation of when this might be needed.
-.new
.option hosts_noproxy_tls smtp "host list&!!" *
.cindex "TLS" "passing connection"
.cindex "multiple SMTP deliveries"
@@ -24105,7 +24076,6 @@ instead, and the original process maintains the TLS connection and proxies
the SMTP connection from and to the new process and any subsequents.
The new process has no access to TLS information, so cannot include it in
logging.
-.wen
@@ -27145,10 +27115,8 @@ When using OpenSSL, this option is ignored.
(If an API is found to let OpenSSL be configured in this way,
let the Exim Maintainers know and we'll likely use it).
.next
-.new
With GnuTLS, if an explicit list is used for the &%tls_privatekey%& main option
main option, it must be ordered to match the &%tls_certificate%& list.
-.wen
.next
Some other recently added features may only be available in one or the other.
This should be documented with the feature. If the documentation does not
@@ -27305,12 +27273,10 @@ tls_require_ciphers = ${if =={$received_port}{25}\
{HIGH:!MD5:!SHA1}}
.endd
-.new
This example will prefer ECDSA-authenticated ciphers over RSA ones:
.code
tls_require_ciphers = ECDSA:RSA:!COMPLEMENTOFDEFAULT
.endd
-.wen
.section "Requiring specific ciphers or other parameters in GnuTLS" &&&
@@ -27418,14 +27384,12 @@ is assumed to be the case. The certificate file may also contain intermediate
certificates that need to be sent to the client to enable it to authenticate
the server's certificate.
-.new
For dual-stack (eg. RSA and ECDSA) configurations, these options can be
colon-separated lists of file paths. Ciphers using given authentication
algorithms require the presence of a suitable certificate to supply the
public-key. The server selects among the certificates to present to the
client depending on the selected cipher, hence the priority ordering for
ciphers will affect which certificate is used.
-.wen
If you do not understand about certificates and keys, please try to find a
source of this background information, which is not Exim-specific. (There are a
@@ -27803,7 +27767,6 @@ built, then you have SNI support).
"SECTmulmessam"
.cindex "multiple SMTP deliveries with TLS"
.cindex "TLS" "multiple message deliveries"
-.new
Exim sends multiple messages down the same TCP/IP connection by starting up
an entirely new delivery process for each message, passing the socket from
one process to the next. This implementation does not fit well with the use
@@ -27816,7 +27779,6 @@ unencrypted data stream from and to the delivery processes.
An older mode of operation can be enabled on a per-host basis by the
&%hosts_noproxy_tls%& option on the &(smtp)& transport. If the host matches
this list the proxy process descibed above is not used; instead Exim
-.wen
shuts down an existing TLS session being run by the delivery process
before passing the socket to a new process. The new process may then
try to start a new TLS session, and if successful, may try to re-authenticate
@@ -29147,11 +29109,9 @@ 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.
-.new
The Received-By: header is generated as soon as the body reception starts,
rather than the traditional time after the full message is received;
this will affect the timestamp.
-.wen
All the usual ACLs are called; if one results in the message being
rejected, all effort spent in delivery (including the costs on
@@ -31087,7 +31047,6 @@ need to use this option unless you know that the called hosts make use of the
sender when checking recipients. If used indiscriminately, it reduces the
usefulness of callout caching.
-.new
.vitem &*hold*&
This option applies to recipient callouts only. For example:
.code
@@ -31102,7 +31061,6 @@ The advantage is only gained if there are no callout cache hits
if the use_sender option is used,
if neither the random nor the use_postmaster option is used,
and if no other callouts intervene.
-.wen
.endlist
If you use any of the parameters that set a non-empty sender for the MAIL
@@ -31740,7 +31698,6 @@ av_scanner = f-protd:localhost 10200-10204
.endd
If you omit the argument, the default values show above are used.
-.new
.vitem &%f-prot6d%&
.cindex "virus scanners" "f-prot6d"
The f-prot6d scanner is accessed using the FPSCAND protocol over TCP.
@@ -31750,7 +31707,6 @@ For example:
av_scanner = f-prot6d:localhost 10200
.endd
If you omit the argument, the default values show above are used.
-.wen
.vitem &%fsecure%&
.cindex "virus scanners" "F-Secure"
@@ -31800,13 +31756,11 @@ For example:
.code
av_scanner = sock:127.0.0.1 6001:%s:(SPAM|VIRUS):(.*)$
.endd
-.new
Note that surrounding whitespace is stripped from each option, meaning
there is no way to specify a trailing newline.
The socket specifier and both regular-expressions are required.
Default for the commandline is &_%s\n_& (note this does have a trailing newline);
specify an empty element to get this.
-.wen
.vitem &%sophie%&
.cindex "virus scanners" "Sophos and Sophie"
@@ -32646,15 +32600,11 @@ C variables are as follows:
.vlist
.vitem &*int&~body_linecount*&
This variable contains the number of lines in the message's body.
-.new
It is not valid if the &%spool_files_wireformat%& option is used.
-.wen
.vitem &*int&~body_zerocount*&
This variable contains the number of binary zero bytes in the message's body.
-.new
It is not valid if the &%spool_files_wireformat%& option is used.
-.wen
.vitem &*unsigned&~int&~debug_selector*&
This variable is set to zero when no debugging is taking place. Otherwise, it
@@ -35978,12 +35928,10 @@ 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.
-.new
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.
TLS cipher information is still available.
-.wen
.cindex "delivery" "cutthrough; logging"
.cindex "cutthrough" "logging"
@@ -36359,13 +36307,11 @@ 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
-.new
.cindex "log" "millisecond timestamps"
.cindex millisecond logging
.cindex timstamps "millisecond, in logs"
&%millisec%&: Timestamps have a period and three decimal places of finer granularity
appended to the seconds value.
-.wen
.next
.cindex "log" "outgoing interface"
.cindex "log" "local interface"
@@ -38109,13 +38055,11 @@ the contents of files on the spool via the Exim monitor (which runs
unprivileged), Exim must be built to allow group read access to its spool
files.
-.new
By default, regular users are trusted to perform basic testing and
introspection commands, as themselves. This setting can be tightened by
setting the &%commandline_checks_require_admin%& option.
This affects most of the checking options,
such as &%-be%& and anything else &%-b*%&.
-.wen
.section "Spool files" "SECID275"
@@ -38236,12 +38180,10 @@ file remains in existence. When Exim next processes the message, it notices the
-J file and uses it to update the -H file before starting the next delivery
attempt.
-.new
Files whose names end with -K or .eml may also be seen in the spool.
These are temporaries used for DKIM or malware processing, when that is used.
They should be tidied up by normal operations; any old ones are probably
relics of crashes and can be removed.
-.wen
.section "Format of the -H file" "SECID282"
.cindex "uid (user id)" "in spool file"
@@ -38403,13 +38345,11 @@ to ensure that the caller is displayed in queue listings).
If a message was scanned by SpamAssassin, this is present. It records the value
of &$spam_score_int$&.
-.new
.vitem &%-spool_file_wireformat%&
The -D file for this message is in wire-format (for ESMTP CHUNKING)
rather than Unix-format.
The line-ending is CRLF rather than newline.
There is still, however, no leading-dot-stuffing.
-.wen
.vitem &%-tls_certificate_verified%&
A TLS certificate was received from the client that sent this message, and the
@@ -38518,7 +38458,6 @@ unqualified domain &'foundation'&.
.ecindex IIDforspo2
.ecindex IIDforspo3
-.new
.section "Format of the -D file" "SECID282a"
The data file is traditionally in Unix-standard format: lines are ended with
an ASCII newline character.
@@ -38530,7 +38469,6 @@ suitable for direct copying to the wire when transmitting using the
ESMTP CHUNKING option, meaning lower processing overhead.
Lines are terminated with an ASCII CRLF pair.
There is no dot-stuffing (and no dot-termination).
-.wen
. ////////////////////////////////////////////////////////////////////////////
. ////////////////////////////////////////////////////////////////////////////
@@ -38588,22 +38526,18 @@ These options take (expandable) strings as arguments.
.option dkim_domain smtp string list&!! unset
The domain(s) you want to sign with.
-.new
After expansion, this can be a list.
Each element in turn is put into the &%$dkim_domain%& expansion variable
while expanding the remaining signing options.
-.wen
If it is empty after expansion, DKIM signing is not done.
.option dkim_selector smtp string list&!! unset
This sets the key selector string.
-.new
After expansion, which can use &$dkim_domain$&, this can be a list.
Each element in turn is put in the expansion
variable &%$dkim_selector%& which may be used in the &%dkim_private_key%&
option along with &%$dkim_domain%&.
If the option is empty after expansion, DKIM signing is not done for this domain.
-.wen
.option dkim_private_key smtp string&!! unset
This sets the private key to use.
@@ -38622,7 +38556,6 @@ is set.
.endlist
If the option is empty after expansion, DKIM signing is not done.
-.new
.option dkim_hash smtp string&!! sha256
Can be set alternatively to &"sha1"& to use an alternate hash
method. Note that sha1 is now condidered insecure, and deprecated.
@@ -38633,7 +38566,6 @@ the signing header. The DKIM standards restrict the permissible
syntax of this optional tag to a mail address, with possibly-empty
local part, an @, and a domain identical to or subdomain of the "d="
tag value. Note that Exim does not check the value.
-.wen
.option dkim_canon smtp string&!! unset
This option sets the canonicalization method used when signing a message.
@@ -38651,7 +38583,6 @@ variables here.
.option dkim_sign_headers smtp string&!! "see below"
If set, this option must expand to a colon-separated
list of header names.
-.new
Headers with these names, or the absence or such a header, will be included
in the message signature.
When unspecified, the header names listed in RFC4871 will be used,
@@ -38669,7 +38600,6 @@ will be signed.
If a '+' prefix if used, all headers that are present with this name
will be signed, and one signtature added for a missing header with the
name will be appended.
-.wen
.section "Verifying DKIM signatures in incoming mail" "SECID514"
@@ -38718,10 +38648,8 @@ dkim_verify_signers = $sender_address_domain:$dkim_signers
If a domain or identity is listed several times in the (expanded) value of
&%dkim_verify_signers%&, the ACL is only called once for that domain or identity.
-.new
If multiple signatures match a domain (or identity), the ACL is called once
for each matching signature.
-.wen
Inside the &%acl_smtp_dkim%&, the following expansion variables are
@@ -38750,7 +38678,6 @@ available in &%$dkim_verify_reason%&.
&%pass%&: The signature passed verification. It is valid.
.endlist
-.new
This variable can be overwritten using an ACL 'set' modifier.
This might, for instance, be done to enforce a policy restriction on
hash-method or key-size:
@@ -38764,7 +38691,6 @@ hash-method or key-size:
After all the DKIM ACL runs have completed, the value becomes a
colon-separated list of the values after each run.
-.wen
.vitem &%$dkim_verify_reason%&
A string giving a little bit more detail when &%$dkim_verify_status%& is either
@@ -38786,9 +38712,7 @@ re-written or otherwise changed in a way which is incompatible with
DKIM verification. It may of course also mean that the signature is forged.
.endlist
-.new
This variable can be overwritten using an ACL 'set' modifier.
-.wen
.vitem &%$dkim_domain%&
The signing domain. IMPORTANT: This variable is only populated if there is
@@ -39235,10 +39159,8 @@ The second column in the table above describes whether the event fires
before or after the action is associates with. Those which fire before
can be used to affect that action (more on this below).
-.new
The third column in the table above says what section of the configumration
should define the event action.
-.wen
An additional variable, &$event_data$&, is filled with information varying
with the event type: