ISPConfig Rspamd ClamAV aktivieren

Nachdem ich mein Mailsystem von Amavis und Spamassassin auf Rspamd umgestellt habe, möchte ich nun ClamAV als Virenscanner hinzuführen. Nachfolgend die Schritte zur Konfiguration.

Damit Rspamd sich mit ClamAV verbinden kann muss die ClamAV Gruppe auf Rspamd berechtigt werden.

# usermod -a -G clamav _rspamd
# chown -R clamav:clamav /var/run/clamav

Als nächstes wird die ClamAV Konfiguration erweitert und folgendes hinzugefügt, bzw. geprüft:

# nano /etc/clamav/clamd.conf

PidFile /var/run/clamav/clamd.pid
LocalSocket /var/run/clamav/clamd.ctl
TCPSocket 3310
TCPAddr localhost

# https://betatim.github.io/posts/clamav-memory-usage/
ConcurrentDatabaseReload no

ClamAV Dienst neustarten

# service clamav-daemon restart

ClamAV Log prüfen

# cat /var/log/clamav/clamav.log |grep 3310
Sun Mar  6 21:36:08 2022 -> TCP: Bound to [::1]:3310
Sun Mar  6 21:36:08 2022 -> TCP: Bound to [127.0.0.1]:3310

# cat /var/log/clamav/clamav.log |grep socket
Sun Mar  6 21:36:08 2022 -> LOCAL: Unix socket file /var/run/clamav/clamd.ctl

Diese Ports werden für Rspamd und ClamAV benötigt.

# egrep "3310/tcp|1133./tcp" /etc/services
clamd              3310/tcp
rspamd-proxy       11332/tcp
rspamd-worker      11333/tcp
rspamd-controller  11334/tcp
rspamd-fuzzy       11335/tcp

Prüfen der Ports

# netstat -unplet|egrep "rspamd|clamd"
tcp        0      0 127.0.0.1:3310          0.0.0.0:*               LISTEN      114        567159319  18138/clamd 
tcp        0      0 127.0.0.1:11332         0.0.0.0:*               LISTEN      124        563882212  7228/rspamd: rspamd
tcp        0      0 127.0.0.1:11333         0.0.0.0:*               LISTEN      124        563882224  7230/rspamd: normal
tcp        0      0 127.0.0.1:11334         0.0.0.0:*               LISTEN      124        563882218  7229/rspamd: contro
tcp6       0      0 ::1:3310                :::*                    LISTEN      114        567159318  18138/clamd 
tcp6       0      0 ::1:11332               :::*                    LISTEN      124        563882213  7228/rspamd: rspamd
tcp6       0      0 ::1:11333               :::*                    LISTEN      124        563882225  7230/rspamd: normal
tcp6       0      0 ::1:11334               :::*                    LISTEN      124        563882219  7229/rspamd: contro

ClamAV für Rspamd konfigurieren

Nun die Konfiguration für Antivirus in Rspamd wie folgt anpassen.

# nano /etc/rspamd/local.d/antivirus.conf
servers = "127.0.0.1:3310";
#servers = "/var/run/clamav/clamd.ctl";

Dienst Rspamd neustarten

# service rspamd restart

Rspamd Log überprüfen

# cat /var/log/rspamd/rspamd.log | grep clamav
2022-03-05 23:55:58 #17221(main) <rpncc6>; lua; antivirus.lua:185: added antivirus engine clamav -> CLAM_VIRUS

ISPconfig Rspamd Template

# nano /usr/local/ispconfig/server/conf-custom/install/rspamd_antivirus.conf.master
#######################################################################################
# ISPConfig:
# vi /usr/local/ispconfig/server/conf-custom/install/rspamd_antivirus.conf.master
# ispconfig_update.sh --force
#######################################################################################

clamav {
    # If set force this action if any virus is found (default unset: no action is forced)
    action = "reject";

    # Scan mime_parts separately - otherwise the complete mail will be transferred to AV Scanner
    scan_mime_parts = true;

    # Scanning Text is suitable for some av scanner databases (e.g. Sanesecurity)
    scan_text_mime = true;
    scan_image_mime = true;

    # If `max_size` is set, messages > n bytes in size are not scanned
    #max_size = 20000000;

    # symbol to add (add it to metric if you want non-zero weight)
    symbol = "CLAM_VIRUS";

    # type of scanner: "clamav", "fprot", "sophos" or "savapi"
    type = "clamav";

    # For "savapi" you must also specify the following variable
    #product_id = 12345;

    # You can enable logging for clean messages
    log_clean = true;

    # servers to query (if port is unspecified, scanner-specific default is used)
    # can be specified multiple times to pool servers
    # can be set to a path to a unix socket
    # Enable this in local.d/antivirus.conf
    servers = "127.0.0.1:3310";
    #servers = "/var/run/clamav/clamd.ctl";

    # if `patterns` is specified virus name will be matched against provided regexes and the related
    # symbol will be yielded if a match is found. If no match is found, default symbol is yielded.
    patterns {
      # symbol_name = "pattern";
      JUST_EICAR = "^Eicar-Test-Signature$";
    }
    patterns_fail {
      # symbol_name = "pattern";
      CLAM_PROTOCOL_ERROR = '^unhandled response';
    }
    # `whitelist` points to a map of IP addresses. Mail from these addresses is not scanned.
    whitelist = "/etc/rspamd/antivirus.wl";
}

ISPconfig Dienste neukonfigurieren

# ispconfig_update.sh --force
...
Reconfigure Services? (yes,no,selected) [yes]: yes

The following custom templates were found:

/usr/local/ispconfig/server/conf-custom/install/rspamd_antivirus.conf.master

Do you want to rename these conf-custom templates now so the default templates are used? (yes,no) [no]: no
...

Rspamd Antivirus Konfiguration prüfen

# egrep -v '(^.*#|^$)' /etc/rspamd/local.d/antivirus.conf
clamav {
    action = "reject";
    scan_mime_parts = true;
    scan_text_mime = true;
    scan_image_mime = true;
    symbol = "CLAM_VIRUS";
    type = "clamav";
    log_clean = true;
    servers = "127.0.0.1:3310";
    patterns {
      JUST_EICAR = "^Eicar-Test-Signature$";
    }
    patterns_fail {
      CLAM_PROTOCOL_ERROR = '^unhandled response';
    }
    whitelist = "/etc/rspamd/antivirus.wl";
}

Test Rspamd und ClamAV mit Eicar Testvirus

Download Eicar Testvirus

# wget https://secure.eicar.org/eicar.com --no-check-certificate && gzip eicar.com

Mail aus der Konsole mittels swaks, dem „Swiss Army Knife for SMTP“ Tool, senden.

# apt install -y swaks

Senden der Mail mit Eicar Testvirus im Anhang

# swaks --to receiver@domain.tld --from sender@doamin.tld --attach - --server localhost < eicar.com.gz

Rspamd Log prüfen

# cat /var/log/rspamd/rspamd.log | grep -i eicar
2022-03-06 21:58:09 #23152(normal) <0510b8>; lua; common.lua:110: clamav: result - virusfound: "Eicar-Test-Signature - score: 1"
...

prüfen des ClamAV Log

# cat /var/log/clamav/clamav.log |grep -i found
Sun Mar  6 21:58:09 2022 -> instream(127.0.0.1@58828): Eicar-Test-Signature(d3c03a1d552e6b7eed704e6e24d7b9d7:98) FOUND

Syslog prüfen

# cat /var/log/syslog |grep -i eicar
clamd[23158]: Sun Mar  6 21:58:09 2022 -> instream(127.0.0.1@58828): Eicar-Test-Signature(d3c03a1d552e6b7eed704e6e24d7b9d7:98) FOUND
postfix/cleanup[24501]: 2DC19A219AA: milter-reject: END-OF-MESSAGE from localhost[::1]: 5.7.1 clamav: virus found: "Eicar-Test-Signature"; from=<sender@domain.tld> to=<receiver@domain.tld> proto=ESMTP helo=<mailserver.tld>

Rspamd WebUI History

Thats it .. Have Fun!