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Rawlog
======

Dovecot supports logging IMAP/POP3/LMTP/SMTP(submission) traffic (also TLS/SSL
encrypted). There are several possibilities for this:

 1. rawlog_dir setting (v2.2.26+)
 2. Using 'rawlog' binary, which is executed as post-login script.
 3. Pre-login imap/pop3-login process via -R parameter.
 4. For <lmtp> [LMTP.txt], you need to use lmtp_rawlog_dir and
    lmtp_proxy_rawlog_dir settings (since v2.3.2)
 5. For <submission> [Submission.txt], you can use rawlog_dir setting and
    submission_relay_rawlog_dir (since v2.3.2)

rawlog_dir setting (v2.2.26+)
-----------------------------

Dovecot creates *.in and *.out rawlogs to the specified directory if it exists.
For example:

---%<-------------------------------------------------------------------------
protocol imap {
  rawlog_dir = /tmp/rawlog/%u
  # if you want to put files into user's homedir, use this, do not use ~
  #rawlog_dir = %h/rawlog
}
---%<-------------------------------------------------------------------------

lmtp_rawlog_dir (v2.3.2+)
-------------------------

You can use lmtp_rawlog_dir to generate rawlogs on lmtp backend server. Unlike
the rawlog_dir setting, this does not accept variables.

lmtp_proxy_rawlog_dir (v2.3.2+)
-------------------------------

You can use lmtp_proxy_rawlog_dir to generate rawlogs on lmtp proxy server.
Unlike the rawlog_dir setting, this does not accept variables.

submission_relay_rawlog_dir (v2.3.2+)
-------------------------------------

You can use submission_relay_rawlog_dir to generate relay rawlogs on the
dovecot submission server.

rawlog binary
-------------

It works by checking if 'dovecot.rawlog/' directory exists in the logged in
user's home directory, and writing the traffic to 'yyyymmdd-HHMMSS-pid.in' and
'.out' files. Each connection gets their own in/out files. Rawlog will simply
skip users who don't have the 'dovecot.rawlog/' directory and the performance
impact for those users is minimal.

Home directory
--------------

Note that for rawlog to work, your <userdb> [UserDatabase.txt] must have
returned a home directory for the user.*IMPORTANT: The home directory must be
returned by userdb, mail_home setting won't work.* Verify that 'doveadm user -u
user@example.com' (with -u parameter) returns the home directory, for example:

---%<-------------------------------------------------------------------------
% doveadm user -u user@example.com
userdb: user@example.com
  user      : user@example.com
  uid       : 1000
  gid       : 1000
  home      : /home/user@example.com
---%<-------------------------------------------------------------------------

In above configuration rawlog would expect to find
'/home/user@example.com/dovecot.rawlog/' directory writable by uid 1000.

If your userdb can't return a home directory directly, with v2.1+ you can add:

---%<-------------------------------------------------------------------------
userdb {
  # ...
  default_fields = home=/home/%u
  # or temporarily even e.g. default_fields = home=/tmp/temp-home
}
---%<-------------------------------------------------------------------------

You can also set DEBUG environment to have rawlog log an info message why it's
not doing anything:

---%<-------------------------------------------------------------------------
import_environment = $import_environment DEBUG=1
---%<-------------------------------------------------------------------------

Configuration
-------------

To enable rawlog, you must use rawlog as a <post-login script>
[PostLoginScripting.txt]:

---%<-------------------------------------------------------------------------
service imap {
  executable = imap postlogin
}
service pop3 {
  executable = pop3 postlogin
}

service postlogin {
  executable = script-login -d rawlog
  unix_listener postlogin {
  }
}
---%<-------------------------------------------------------------------------

You can also give parameters to rawlog:

 * -b: Write IP packet boundaries (or whatever read() sees anyway) to the log
   files. The packet is written between<<< and >>>.
 * -t: Log a microsecond resolution timestamp at the beginning of each line.
 * -I: Include IP address in the filename (v2.2.16+)
 * v2.1 and newer:
    * -f in: Log only to *.in files
    * -f out: Log only to *.out files
 * v2.0 and older:
    * -i: Log only to *.in files
    * -o: Log only to *.out files

Pre-login rawlog (v2.1+)
------------------------

You can enable pre-login rawlog for all users by telling the login processes to
log to a rawlog directory, for example:

---%<-------------------------------------------------------------------------
service imap-login {
  executable = imap-login -R rawlogs
}
---%<-------------------------------------------------------------------------

This tries to write the rawlogs under $base_dir/login/rawlogs directory. You
need to create it first with enough write permissions, e.g.:

---%<-------------------------------------------------------------------------
mkdir /var/run/dovecot/login/rawlogs
chown dovenull /var/run/dovecot/login/rawlogs
chmod 0700 /var/run/dovecot/login/rawlogs
---%<-------------------------------------------------------------------------

(This file was created from the wiki on 2019-06-19 12:42)