cyr_virusscan¶

Scan for viruses using configured virus scanner or manage infected messages using search criteria.

Synopsis¶

cyr_virusscan [ -C config-file ] [ -s imap-search-string ] [ -r [ -n] ] [-v] [ mboxpattern1 ... ]

Description¶

cyr_virusscan can be used to invoke an external virus scanner (currently only ClamAV is supported) to scan specified IMAP mailboxes. If no mboxpattern is given, cyr_virusscan works on all mailboxes.

Alternately, with the -s option, the IMAP SEARCH string will be used as a specification of messages which are assumed to be infected, and will be treated as such. The virus scanner is not invoked. Useful for removing messages without a distinct signature, such as Phish.

A table of infected messages will be output.

To remove infected messages, use the -r flag. Infected messages will be expunged from the user’s mailbox.

With the notify flag, -n, notifications will be appended to the inbox of the mailbox owner, containing message digest information for the affected mail. This flag is only works in combination with -r.

cyr_virusscan can be configured to run periodically by cron(8) via crontab(5) or your preferred method (i.e. /etc/cron.hourly), or by master(8) via the EVENTS{} section in cyrus.conf(5).

cyr_virusscan reads its configuration options out of the imapd.conf(5) file unless specified otherwise by -C.

Note that Cyrus does not ship with any virus scanners: you need to install one separately to make use of it with Cyrus.

Options¶

-C config-file¶: Use the specified configuration file config-file rather than the default imapd.conf(5).

-n¶: Notify mailbox owner of deleted messages via email. This flag is only operable in combination with -r.

-r¶: Remove infected messages.

-s imap-search-string¶: Rather than scanning for viruses, messages matching the search criteria will be treated as infected.

-v¶: Produce more verbose output

Examples¶

cyr_virusscan

Scan all mailboxes, printing report on the screen. Do not remove infected messages.

Using ClamAV virus scanner
Loaded 5789330 virus signatures.

Mailbox Name                                       Msg UID      Status  Virus Name
----------------------------------------        ----------      ------  --------------------------------------------------
user.betty                                          185395        READ  Heuristics.Phishing.Email.SpoofedDomain
user.betty.Bank stuff                                    9        READ  Html.Phishing.Bank-1172
user.betty.Bank stuff                                   10        READ  Html.Phishing.Bank-1172
user.betty.Bank stuff                                   11        READ  Html.Phishing.Bank-1172

Mailbox Name                                       Msg UID      Status  Virus Name
----------------------------------------        ----------      ------  --------------------------------------------------
user.bovik                                           17426        READ  Email.Trojan.Trojan-1051

cyr_virusscan -r -n user/bovik

Scan mailbox user/bovik, removing infected messages and append notifications to bovik’s inbox.

Mailbox Name                                       Msg UID      Status  Virus Name
----------------------------------------        ----------      ------  --------------------------------------------------
user.bovik                                         17426          READ  Email.Trojan.Trojan-1051

A message like this would end up in bovik’s inbox:

The following message was deleted from mailbox 'Inbox.bovik'
because it was infected with virus 'Email.Trojan.Trojan-1051'

    Message-ID: <201308131519.r7DFJM9K083763@tselina.kiev.ua>
    Date: Tue, 13 Aug 2013 18:19:22 +0300 (EEST)
    From: ("FEDEX Thomas Cooper" NIL "thomas_cooper94" "themovieposterpage.com")
    Subject: Problem with the delivery of parcel
    IMAP UID: 17426

cyr_virusscan -r -n -s 'SUBJECT "Fedex"' user/bovik

Search mailbox user/bovik for messages which have Fedex in the subject line, removing them all, and appending notifications to Bovik’s inbox.

Mailbox Name                                       Msg UID      Status  Virus Name
----------------------------------------        ----------      ------  --------------------------------------------------
user.bovik                                         17185          READ  Cyrus Administrator Targeted Removal (Phish, etc.)
user.bovik                                         17203          READ  Cyrus Administrator Targeted Removal (Phish, etc.)
user.bovik                                         17338          READ  Cyrus Administrator Targeted Removal (Phish, etc.)
user.bovik                                         17373          READ  Cyrus Administrator Targeted Removal (Phish, etc.)
user.bovik                                         19238          READ  Cyrus Administrator Targeted Removal (Phish, etc.)
user.bovik                                         19268          READ  Cyrus Administrator Targeted Removal (Phish, etc.)

History¶

Virus scan support was first introduced in Cyrus version 3.0.

Files¶

/etc/imapd.conf

Cyrus IMAP