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0fab78829bc4b9ded784a405f259ab3377c082a8
[etc/mailfilter.git] / procmail / spamfilter
1 #!/usr/bin/procmail
2
3 #TODO: rewrite to use SPAM variable, and do not autotrain spam here, only ham
4
5 PMDIR=${PMDIR:-$HOME/.etc/mailfilter/procmail}
6
7 :0
8 * !PMVAR ?? .
9 {
10   # PMVAR is not defined, so we are being called as filter
11   # thus source the standard defines
12   INCLUDERC=$PMDIR/defines
13   # prevent feeding back to procmail and delete the leading From line
14   PROCMAIL='/bin/cat'
15   # and tell the fucking procmail piece-of-shit to continue to be a filter
16   DEFAULT='|$PROCMAIL'
17 }
18
19 #VERBOSE=yes
20
21 INCLUDERC=$PMDIR/pre-spam-cleanup
22
23 # no need to reprocess messages that went into a spamtrap
24 # UPDATE: retrain them only if diagnosed as non-spam, see below
25 #:0
26 #* SPAMTRAPPED ?? .
27 #{ 
28 #  LOG="spamfilter:  skipping checks for spamtrapped message$NL"
29 #  :0 fw
30 #  |$FORMAIL -I"X-Spam: spamtrapped"
31 #}
32
33 # let earlier parts of the mailfilter cause bypassing the checks
34 :0 E
35 * SKIP_SPAMCHECKS ?? .
36
37   LOG="spamfilter:  skipping checks as requested: $SKIP_SPAMCHECKS$NL" 
38   :0 fw
39   |$FORMAIL -I"X-Spam: unknown (skip requested)"
40   SPAM_UNKNOWN=skip-requested
41 }
42
43 # honour skip-spamchecks to exclude certain messages from spam checks
44 # altogether
45 :0 EBH
46 * ? $EGREP -qif $CONF/skip-spamchecks
47 {
48   LOG="spamfilter:  skipping checks as per skip-spamchecks$NL"
49   :0 fw
50   |$FORMAIL -I"X-Spam: unknown (check skipped)"
51   SPAM_UNKNOWN=skip-match
52 }
53
54 # sanity check on message size
55 :0 E
56 * > $SPAMCHECK_MAX_MESSAGE_SIZE
57 {
58   LOG="spamfilter:  skipping check because message size exceeds $SPAMCHECK_MAX_MESSAGE_SIZE bytes$NL"
59   :0 fw
60   |$FORMAIL -I"X-Spam: unknown (message larger than $SPAMCHECK_MAX_MESSAGE_SIZE bytes)"
61   SPAM_UNKNOWN=too-large
62 }
63
64 # now run the spamfilters
65 :0 E
66 {
67   # crm114
68   CRM_SPAM=UNKNOWN
69   CRM_SCORE=0
70   :0
71   * !SKIP_CRM ?? .
72   {
73     :0 fw
74     |$CRM114
75
76     :0
77     * ^X-CRM114-Status: \/[A-Z]+
78     { CRM_SPAM=$MATCH }
79
80     :0
81     * ^X-CRM114-Status: .+\([ ]*\/-?[.0-9]+
82     { CRM_SCORE=$MATCH }
83
84     LOG="crm114:      $CRM_SPAM/$CRM_SCORE$NL"
85   }
86
87   # spamassassin
88   SA_STATUS=Unknown
89   SA_SCORE=0
90   SA_TESTS=none
91   :0
92   * !SKIP_SA ?? .
93   {
94     :0 fw
95     |$SPAMC
96
97     :0
98     * ^X-Spam-Status: \/[A-Za-z]+
99     { SA_SPAM=$MATCH }
100
101     :0
102     * ^X-Spam-Status: .+score=\/-?[.0-9]+
103     { SA_SCORE=$MATCH }
104
105     :0
106     * ^X-Spam-Status: .+tests=\/[^ ]+
107     { SA_TESTS=$MATCH }
108
109     LOG="SA:          $SA_SPAM/$SA_SCORE/$SA_TESTS$NL"
110   }
111
112   ## CASE 0: crm114 is unsure/untrained
113   :0
114   * CRM_SPAM ?? UNSURE
115   {
116     # retrain as ham
117     :0
118     * ? perl -e "$SA_SCORE <= $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_HAM || exit 1"
119     {
120       LOG="spamfilter:  scheduling crm114 retraining with HAM (score $SA_SCORE <= $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_HAM)$NL"
121       :0 fw
122       |$FORMAIL -A "X-CRM114-Autotrain: ham, according to SA (score $SA_SCORE <= $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_HAM)"
123       RETRAIN=ham
124     }
125
126     # retrain as spam
127     :0 E
128     * ? perl -e "$SA_SCORE > $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_SPAM || exit 1"
129     {
130       LOG="spamfilter:  scheduling crm114 retraining with SPAM (score $SA_SCORE > $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_SPAM)$NL"
131       :0 fw
132       |$FORMAIL -A "X-CRM114-Autotrain: spam, according to SA (score $SA_SCORE > $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_SPAM)"
133       RETRAIN=spam
134     }
135
136     # skip retraining if SA is not convinced
137     :0 E
138     {
139       LOG="spamfilter:  will not autotrain crm114 because SA is not convinced ($CRM_UNSURE_SA_AUTOTRAIN_LIMIT_HAM <= $SA_SCORE < $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_SPAM)$NL"
140       :0 fw
141       |$FORMAIL -A "X-CRM114-Autotrain: SA is unsure ($CRM_UNSURE_SA_AUTOTRAIN_LIMIT_HAM <= $SA_SCORE < $CRM_UNSURE_SA_AUTOTRAIN_LIMIT_SPAM)"
142       SPAM_UNSURE=sa-unsure
143     }
144   }
145
146   ## CASE 1: disagreement, SA sees ham
147   :0 E
148   * CRM_SPAM ?? SPAM
149   * SA_SPAM ?? No
150   {
151     # SA is convincing, so retrain crm114
152     :0
153     * ? perl -e "$SA_SCORE <= $CRM_MISCLASSIFY_SA_AUTOTRAIN_LIMIT_HAM || exit 1"
154     {
155       LOG="spamfilter:  crm114 found spam ($CRM_SCORE), but SA is more convincing ($SA_SCORE <= $CRM_MISCLASSIFY_SA_AUTOTRAIN_LIMIT_HAM)$NL"
156       RETRAIN=ham
157       :0 fw
158       |$FORMAIL -A "X-CRM114-Retrain: ham, according to SA (score $SA_SCORE <= $CRM_MISCLASSIFY_SA_AUTOTRAIN_LIMIT_HAM)"
159     }
160
161     # SA is not convincing, mark as disagreement
162     :0 E
163     {
164       LOG="spamfilter:  crm114 found spam ($CRM_SCORE), but SA thinks it's ham ($SA_SCORE)$NL"
165       SPAM_DISAGREE=sa-ham
166       :0 fw
167       |$FORMAIL -I "X-Spam: disagree (crm114:spam/$CRM_SCORE SA:ham/$SA_SCORE)"
168     }
169   }
170
171   ## CASE 1: disagreement, SA sees spam
172   :0 E
173   * CRM_SPAM ?? GOOD
174   * SA_SPAM ?? Yes
175   {
176     # SA is convincing, so retrain crm114
177     :0
178     * ? perl -e "$SA_SCORE > $CRM_MISCLASSIFY_SA_AUTOTRAIN_LIMIT_SPAM || exit 1"
179     {
180       LOG="spamfilter:  crm114 found ham ($CRM_SCORE), but SA is more convincing ($SA_SCORE > $CRM_MISCLASSIFY_SA_AUTOTRAIN_LIMIT_SPAM)$NL"
181       RETRAIN=spam
182       :0 fw
183       |$FORMAIL -A "X-CRM114-Retrain: spam, according to SA (score $SA_SCORE > $CRM_MISCLASSIFY_SA_AUTOTRAIN_LIMIT_SPAM)"
184     }
185
186     # SA is not convincing, mark as disagreement
187     :0 E
188     {
189       LOG="spamfilter:  crm114 found ham ($CRM_SCORE), but SA thinks it's spam ($SA_SCORE)$NL"
190       SPAM_DISAGREE=sa-spam
191       :0 fw
192       |$FORMAIL -I "X-Spam: disagree (crm114:ham/$CRM_SCORE SA:spam/$SA_SCORE)"
193     }
194   }
195
196   :0 E
197   * CRM_SPAM ?? SPAM
198   * SA_SPAM ?? Yes
199   { 
200     IS_SPAM=sa+crm
201     :0 fw
202     |$FORMAIL -I"X-Spam: yes (crm114:$CRM_SCORE SA:$SA_SCORE)"
203   }
204
205   :0 Efw
206   |$FORMAIL -I"X-Spam: no (crm114:$CRM_SCORE SA:$SA_SCORE)"
207 }
208
209 # schedule spamtrapped ham for retraining as spam
210 :0
211 * SPAMTRAPPED ?? .
212 * ! IS_SPAM ?? .
213 { RETRAIN=spam }
214
215 INCLUDERC=$PMDIR/handlespam
216 #VERBOSE=no