Mit dem Plugin BayesOCR ist es möglich Spam der nur aus Bildern besteht zu analysieren. Dazu muss einfach Plugin und Konfiguration herunter geladen werden und in /etc/spamassassin abgelegt werden.
https://pralab.diee.unica.it/en/BayesOCR
Als Abhängigkeit wird imagemagick und gocr benötigt.
apt install imagemagick gocrNach einem Neustart von spamassassin kann der erfolgreiche Start kontrolliert werden:
service spamassassin restart
spamassassin -D --lint 2>&1 | grep -i BayesOCR
Jan 10 22:54:59.418 [2366946] dbg: config: read file /etc/spamassassin/BayesOCR_PLG.cf
Jan 10 22:54:59.978 [2366946] dbg: config: fixed relative path: /etc/spamassassin/BayesOCR_PLG.pm
Jan 10 22:54:59.978 [2366946] dbg: plugin: loading BayesOCR_PLG from /etc/spamassassin/BayesOCR_PLG.pm
Jan 10 22:54:59.979 [2366946] dbg: PLG-BayesOCR: : new:: register_eval_rule
Jan 10 22:55:02.275 [2366946] dbg: plugin: BayesOCR_PLG=HASH(0x5569b815e478) implements 'check_start', priority 0
Jan 10 22:55:02.276 [2366946] dbg: PLG-BayesOCR: : check_start:: init score
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG30
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.40, 0.30)
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : imageSpam_OCRTextProcessing:: Check for Attached Images
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : imageTextExtractionFromMSG:: Extract & Convert Images
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : imageTextExtractionFromMSG:: 0 images extracted
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check:: Write Mail Header
Jan 10 22:55:02.705 [2366946] dbg: check: tagrun - tag PLGBAYESOCROUT is now ready, value: 0.0 (No images found)
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG70
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.80, 0.70)
Jan 10 22:55:02.705 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG50
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.60, 0.50)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG95
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.99, 0.95)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG80
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.90, 0.80)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG60
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.70, 0.60)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG10
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.20, 0.10)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG20
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.30, 0.20)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG90
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.95, 0.90)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG40
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (0.50, 0.40)
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: Rule: BayesOCR_PLG99
Jan 10 22:55:02.706 [2366946] dbg: PLG-BayesOCR: : BayesOCR_check :: thr: (1.00, 0.99)