milter-gris/0.24
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| text!/path/map.txt | R/O text file, memory hash |
| /path/map.db | Berkeley DB hash format |
| db!/path/map.db | Berkeley DB hash format |
| db!btree!/path/map.db | Berkeley DB btree format |
| sql!/path/database | An SQLite3 database |
| socketmap!host:port | Sendmail style socket-map |
| socketmap!/path/local/socket | Sendmail style socket-map |
| socketmap!123.45.67.89:port | Sendmail style socket-map |
| socketmap![2001:0DB8::1234]:port | Sendmail style socket-map |
If :port is omitted, the default is 7953.
The access-db contains key-value pairs. Lookups are performed from most to least specific, stopping on the first entry found. Keys are case-insensitive.
An IPv4 lookup is repeated several times reducing the IP address by one octet from right to left until a match is found.
tag:192.0.2.9 tag:192.0.2 tag:192.0 tag:192
An IPv6 lookup is repeated several times reducing the IP address by one 16-bit word from right to left until a match is found.
tag:2001:0DB8:0:0:0:0:1234:5678 tag:2001:0DB8:0:0:0:0:1234 tag:2001:0DB8:0:0:0:0 tag:2001:0DB8:0:0:0 tag:2001:0DB8:0:0 tag:2001:0DB8:0:0 tag:2001:0DB8:0 tag:2001:0DB8 tag:2001
A domain lookup is repeated several times reducing the domain by one label from left to right until a match is found.
tag:[ipv6:2001:0DB8::1234:5678] tag:[192.0.2.9] tag:sub.domain.tld tag:domain.tld tag:tld tag:
An email lookup is similar to a domain lookup, the exact address is first tried, then the address's domain, and finally the local part of the address.
tag:account@sub.domain.tld tag:sub.domain.tld tag:domain.tld tag:tld tag:account@ tag:
If a key is found and is a milter specific tag (ie. milter-gris-Connect, milter-gris-From, milter-gris-Auth, milter-gris-To), then the value is processed as a pattern list and the result returned. The Sendmail variants cannot have a pattern list. A pattern list is a whitespace separated list of pattern-action pairs followed by an optional default action. The supported patterns are:
[network/cidr]action Classless Inter-Domain Routing !pattern!action Simple fast text matching. /regex/action POSIX Extended Regular Expressions
The CIDR will only ever match for IP address related lookups.
A !pattern! uses an astrisk (*) for a wildcard, scanning over zero or more characters; a question-mark (?) matches any single character; a backslash followed by any character treats it as a literal (it loses any special meaning).
!abc! exact match for 'abc' !abc*! match 'abc' at start of string !*abc! match 'abc' at the end of string !abc*def! match 'abc' at the start and match 'def' at the end, maybe with stuff in between. !*abc*def*! find 'abc', then find 'def'
For black-white lookups, the following actions are recognised: OK or RELAY (white list), REJECT or ERROR (black list), DISCARD (accept & discard), SKIP or DUNNO (stop lookup, no result), and NEXT (opposite of SKIP, resume lookup). Its possible to specify an empty action after a pattern, which is treated like SKIP returning an undefined result. Other options may specify other actions.
Below is a list of supported tags. Other options may specify additional tags.
milter-gris-Connect:client-ip value § Can be a pattern list. Connect:client-ip value milter-gris-Connect:[client-ip] value § Can be a pattern list. milter-gris-Connect:client-domain value § Can be a pattern list. milter-gris-Connect: value § Can be a pattern list. Connect:[client-ip] value Connect:client-domain value All mail sent by a connecting client-ip, unresolved client-ip address or IP addresses that resolve to a client-domain are black or white-listed. These allows you to white-list your network for mail sent internally and off-site, or connections from outside networks. Note that Sendmail also has special semantics for Connect: and untagged forms. milter-gris-From:sender-address value § Can be a pattern list. milter-gris-From:sender-domain value § Can be a pattern list. milter-gris-From:sender@ value § Can be a pattern list. milter-gris-From: value § Can be a pattern list. From:sender-address value From:sender-domain value From:sender@ value All mail from the sender-address, sender-domain, or that begins with sender is black or white-listed. In the case of a +detailed email address, the left hand side of the +detail is used for the sender@ lookup. Note that Sendmail also has special semantics for From: and untagged forms. milter-gris-Auth:auth_authen value § Can be a pattern list. milter-gris-Auth: value § Can be a pattern list. All mail from the authenticated sender, as given by sendmail's {auth_authen} macro, is black or white-listed. The string searched by the pattern list will be the sender-address. The empty form of milter-gris-Auth: allows for a milter specific default only when {auth_authen} is defined.milter-gris-To:recipient-address value § Can be a pattern list. milter-gris-To:recipient-domain value § Can be a pattern list. milter-gris-To:recipient@ value § Can be a pattern list. milter-gris-To: value § Can be a pattern list. Spam:recipient-address value * (FRIEND or HATER are recognised) Spam:recipient-domain value * (FRIEND or HATER are recognised) Spam:recipient@ value * (FRIEND or HATER are recognised) To:recipient-address value To:recipient-domain value To:recipient@ value All mail to the recipient-address, recipient-domain, or that begins with recipient is black or white-listed. In the case of a +detailed email address, the left hand side of the +detail is used for the recipient@ lookup. Note that Sendmail also has special semantics for Spam:, To:, and untagged forms.
The milter-gris-Connect:, milter-gris-From:, and milter-gris-To: tags provide a milter specific means to override the Sendmail variants. For example, you normally white list your local network through any and all milters, but on the odd occasion you might want to actually scan mail from inside going out, without removing the Connect: tag that allows Sendmail to relay for your network or white listing for other milters. So for example if you have Sendmail tags like:
To:mx.example.com RELAY
You might have to add milter specific overrides in order to make sure the mail still gets filtered:
To:mx.example.com RELAY milter-gris-To:mx.example.com SKIP
Some additional examples:
milter-gris-Connect:80.94 [80.94.96.0/20]OK REJECT Accept connections from the netblock 80.94.96.0/20 (80.94.96.0 through to 80.94.111.255) and rejecting anything else in 80.94.0.0/16. milter-gris-Connect:192.0.2 /^192\.0\.2\.8[0-9]/OK REJECT Accept connections from 192.0.2.80 through to 192.0.2.89, reject everything else in 192.0.2.0/24. milter-gris-From:example.com /^john@.+/OK /^fred\+.*@.*/OK REJECT Accept mail from <john@example.com> and <fred@example.com> when fred's address contains a plus-detail in the address. Reject everything else from example.com. milter-gris-To:example.net !*+*@*!REJECT !*.smith@*!REJECT /^[0-9].*/REJECT Reject mail to example.net using a plus-detail address or to any user who's last name is "smith" or addresses starting with a digit. No default given, so B/W processing would continue.
Normally when the access.db lookup matches a milter tag, then the value pattern list is processed and there are no further access.db lookups. The NEXT action allows the access.db lookups to resume and is effectively the opposite of SKIP. Consider the following examples:
milter-gris-From:com
From:com/@com/REJECT NEXT
OKReject mail from places like compaq.com or com.com if the pattern matches, but resume the access.db lookups otherwise. milter-gris-From:aol.com
From:fred@aol.com/^[a-zA-Z0-9!#$&'*+=?^_`{|}~.-]{3,16}@aol.com$/NEXT REJECT
OKAOL local parts are between 3 and 16 characters long and can contain dots and RFC 2822 atext characters except % and /. The NEXT used above allows one simple regex to validate the format of the address and proceed to lookup white listed and/or black listed addresses.
all All possible bits. ip The connection client IP address. helo The HELO/EHLO argument. The MAIL argument. rcpt The current RCPT argument.
bdb,
flatfile, hash.
milter-gris.
Typically a unix named socket or a host:port. This value must match the value specified for
the INPUT_MAIL_FILTER() macro in the sendmail.mc file. The accepted syntax is:
{unix|local}:/path/to/file- A named pipe. (default)
inet:port@{hostname|ip-address}- An IPV4 socket.
inet6:port@{hostname|ip-address}- An IPV6 socket.
kill -QUIT `cat /var/run/milter/milter-gris.pid`
§ all All messages § 0 Log nothing. § info General info messages. (default) § trace Trace progress through the milter. § parse Details from parsing addresses or special strings. debug Lots of debug messages. dialog I/O from Communications dialog state State transitions of message body scanner. dns Trace & debug of DNS operations § cache Cache get/put/gc operations. § database Sendmail database lookups. socket-fd Socket open & close calls socket-all All socket operations & I/O § libmilter libmilter engine diagnostics
SMTP Responses
This is the list of possible SMTP responses generated by milter-gris.
- 553 5.1.0 imbalanced angle brackets in path
- The path given for a MAIL or RCPT command is missing a closing angle bracket
- 553 5.1.0 address does not conform to RFC 2821 syntax
- The address is missing the angle brackets, < and >, as required by the RFC grammar.
- 553 5.1.0 local-part too long
- The stuff before the @ is too long.
- 553 5.1.[37] invalid local part
- The stuff before the @ sign contains unacceptable characters.
- 553 5.1.0 domain name too long
- The stuff after the @ is too long.
- 553 5.1.7 address incomplete
- Expecting a domain.tld after the @ sign and found none.
- 553 5.1.[37] invalid domain name
- The domain after the @ sign contains unacceptable characters.
- 450 4.7.1 try again later
- The response issued during the initial temporary block period.
Installation
Download:
milter-gris/0.24 md5sum Change Log LibSnert md5sum Change Log Sendmail 8.14 http://www.sendmail.org/ Berkeley DB http://www.sleepycat.com/ -
In order to support B/W lists
milter-grisrequires Berkeley DB 3 or better. If you do not require support for Sendmail's access database, skip this step.You should build and install Berkeley DB library first, if you do not already have it. Please read the Berkeley DB documentation on how to build the library. Briefly, it should be something like this:
cd (path to)/db-4.3.27/build_unix ../dist/configure make make install
If your system is Linux and you install Berkeley DB in the default, non- standard, location then you must remember to update
/etc/ld.so.confand runldconfig. You can change the default install location by specifying the../dist/configureoption--prefix=/usr/localfor example.-
Note that Sendmail will probably have to be rebuilt to use Berkeley DB, especially if the library was never installed and/or Sendmail was built against an older version of Berkeley DB. Please see the Sendmail documentation as to how this is done. The following is a brief outline, however be sure to read
devtools/README,devtools/Site/README, and "Using Berkeley DB with Sendmail" for details on how to configure the Sendmail build process. Outline of stepscd (path to)/sendmail-8.14.0 vi devtools/Site/site.config.m4 sh Build -c sh Build install
-
If you have never built a milter for Sendmail, then please make sure that you build and install
libmilter, which is not built by default when you build Sendmail. Please read thelibmilterdocumentation. Briefly, it should be something like this:cd (path to)/sendmail-8.14.0/libmilter sh Build -c sh Build install
-
The build process for
libsnertandmilter-grisis pretty straight forward once you havelibmilterinstalled:cd (path to)/com/snert/src/lib ./configure make build cd ../milter-gris ./configure make build make install
Both configuration scripts have some options that allow you to override defaults. Those options are listed with:
./configure --help
-
An example
/usr/local/share/examples/milter-gris/milter-gris.mcis supplied. This file should be reviewed and the necessary elements inserted into your Sendmail.mcfile andsendmail.cfrebuilt. Please note the comments on the general milter flags. -
Once installed and configured, start
milter-grisand then restart Sendmail. An example startup script is provided in/usr/local/share/examples/milter-gris/milter-gris.sh. The default options can be altered by specifying them on the command-line or within a/etc/mail/milter-gris.cf. Themilter-gris.cfis parsed first followed by the command-line options.
Notes
Currently tested platforms:
Cobalt Qube 1 with Linux RH 5.1 (mips 2.0.34 kernel);Linux RH 5.1 (Intel x386 2.2.25 kernel);FreeBSD 4.8, 4.9 (Intel x386);OpenBSD 3.6 (Intel x386)If you use this milter in conjunction with milter-sender its suggested that
milter-griscome beforemilter-senderin thesendmail.mcconfiguration. Also note thatmilter-senderuses grey-listing in some cases, which can result in double-length delays.It should work for IPv4 and IPv6 "out of the box", since the
{client_addr}macro supplied by Sendmail, is a textual string.-
When using the access-db option, you should place the local host and your local network in the access database. For example:
Connect:127.0.0.1 OK Connect:192.168.1 OK
You might want to review the following recommended IP white list for servers known to have problems with grey-listing servers. It is updated from time to time.
-
The minimum desired file ownership and permissions are as follows for a typical Linux system. For FreeBSD, NetBSD, and OpenBSD the binary and cache locations may differ, but have the same permissions.
Process user ``milter'' is primary member of group ``milter'' and secondary member of group ``smmsp''. Note that the milter should be started as root, so that it can create a .pid file and .socket file in /var/run; after which it will switch process ownership to milter:milter before starting the accept socket thread.
/etc/mail/ root:smmsp 0750 drwxr-x--- /etc/mail/access.db root:smmsp 0640 -rw-r----- /etc/mail/sendmail.cf root:smmsp 0640 -rw-r----- /etc/mail/milter-gris.cf root:root 0644 -rw-r--r-- /var/run/milter/milter-gris.pid milter:milter 0644 -rw-r--r-- /var/run/milter/milter-gris.socket milter:milter 0644 srw-r--r-- /var/db/milter-gris milter:milter 0644 -rw-r--r-- (*BSD) /var/cache/milter-gris milter:milter 0644 -rw-r--r-- (linux) /usr/local/libexec/milter-gris root:milter 0550 -r-xr-x--- milter-greylist, written by Emmanuel Dreyfus, is another C based greylist milter, that has a different approach and feature set.
I would like to express my thanks to Derek Balling for his support at http://www.milter.org/.
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candles in the night since 1 April 2004