This documentation is for Dovecot v2.x, see wiki1 for v1.x documentation.
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Revision 9 as of 2016-03-01 10:34:41
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Revision 10 as of 2016-05-05 21:04:07
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Editor: cable-86-56-78-58
Comment: Correction of path to rawlog
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mkdir /var/run/dovecot/login/rawlogs
chown dovenull /var/run/dovecot/login/rawlogs
chmod 0700 /var/run/dovecot/login/rawlogs
mkdir /var/run/dovecot/login/rawlog
chown dovenull /var/run/dovecot/login/rawlog
chmod 0700 /var/run/dovecot/login/rawlog

Rawlog

Dovecot supports logging post-login IMAP/POP3 traffic (also TLS/SSL encrypted) using 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 must have returned a home directory for the user. If you can't get rawlog to work, you should verify that the home directory really is where you expected it to be by setting mail_debug=yes and checking the logs. You should see a line such as:

Effective uid=1000, gid=1000, home=/home/user

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

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

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

Configuration

To enable rawlog, you must use rawlog as a post-login script:

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/rawlog
chown dovenull /var/run/dovecot/login/rawlog
chmod 0700 /var/run/dovecot/login/rawlog

None: Debugging/Rawlog (last edited 2021-07-07 23:37:53 by MichaelSlusarz)