Commit | Line | Data |
---|---|---|
8d7d227d | 1 | /* $Cambridge: exim/src/src/spam.c,v 1.7 2005/06/10 13:29:36 tom Exp $ */ |
8523533c TK |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */ | |
8 | /* License: GPL */ | |
9 | ||
10 | /* Code for calling spamassassin's spamd. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
13 | #ifdef WITH_CONTENT_SCAN | |
14 | #include "spam.h" | |
15 | ||
16 | uschar spam_score_buffer[16]; | |
17 | uschar spam_score_int_buffer[16]; | |
18 | uschar spam_bar_buffer[128]; | |
19 | uschar spam_report_buffer[32600]; | |
20 | uschar prev_user_name[128] = ""; | |
21 | int spam_ok = 0; | |
22 | int spam_rc = 0; | |
23 | ||
24 | int spam(uschar **listptr) { | |
25 | int sep = 0; | |
26 | uschar *list = *listptr; | |
27 | uschar *user_name; | |
28 | uschar user_name_buffer[128]; | |
f7b63901 | 29 | unsigned long mbox_size; |
8523533c TK |
30 | FILE *mbox_file; |
31 | int spamd_sock; | |
32 | uschar spamd_buffer[32600]; | |
cfe75fc3 | 33 | int i, j, offset, result; |
8523533c TK |
34 | uschar spamd_version[8]; |
35 | uschar spamd_score_char; | |
36 | double spamd_threshold, spamd_score; | |
37 | int spamd_report_offset; | |
38 | uschar *p,*q; | |
39 | int override = 0; | |
cfe75fc3 PH |
40 | time_t start; |
41 | size_t read, wrote; | |
8523533c | 42 | struct sockaddr_un server; |
f452e07e | 43 | #ifndef NO_POLL_H |
cfe75fc3 | 44 | struct pollfd pollfd; |
f452e07e | 45 | #endif |
8523533c TK |
46 | |
47 | /* find the username from the option list */ | |
48 | if ((user_name = string_nextinlist(&list, &sep, | |
49 | user_name_buffer, | |
50 | sizeof(user_name_buffer))) == NULL) { | |
51 | /* no username given, this means no scanning should be done */ | |
52 | return FAIL; | |
53 | }; | |
54 | ||
55 | /* if username is "0" or "false", do not scan */ | |
56 | if ( (Ustrcmp(user_name,"0") == 0) || | |
57 | (strcmpic(user_name,US"false") == 0) ) { | |
58 | return FAIL; | |
59 | }; | |
60 | ||
61 | /* if there is an additional option, check if it is "true" */ | |
62 | if (strcmpic(list,US"true") == 0) { | |
63 | /* in that case, always return true later */ | |
64 | override = 1; | |
65 | }; | |
66 | ||
8e669ac1 | 67 | /* if we scanned for this username last time, just return */ |
8523533c TK |
68 | if ( spam_ok && ( Ustrcmp(prev_user_name, user_name) == 0 ) ) { |
69 | if (override) | |
70 | return OK; | |
71 | else | |
72 | return spam_rc; | |
73 | }; | |
8e669ac1 | 74 | |
8523533c TK |
75 | /* make sure the eml mbox file is spooled up */ |
76 | mbox_file = spool_mbox(&mbox_size); | |
8e669ac1 | 77 | |
8523533c TK |
78 | if (mbox_file == NULL) { |
79 | /* error while spooling */ | |
80 | log_write(0, LOG_MAIN|LOG_PANIC, | |
81 | "spam acl condition: error while creating mbox spool file"); | |
82 | return DEFER; | |
83 | }; | |
84 | ||
cfe75fc3 | 85 | start = time(NULL); |
8523533c TK |
86 | /* socket does not start with '/' -> network socket */ |
87 | if (*spamd_address != '/') { | |
88 | time_t now = time(NULL); | |
89 | int num_servers = 0; | |
90 | int current_server = 0; | |
91 | int start_server = 0; | |
92 | uschar *address = NULL; | |
93 | uschar *spamd_address_list_ptr = spamd_address; | |
94 | uschar address_buffer[256]; | |
95 | spamd_address_container * spamd_address_vector[32]; | |
96 | ||
97 | /* Check how many spamd servers we have | |
98 | and register their addresses */ | |
99 | while ((address = string_nextinlist(&spamd_address_list_ptr, &sep, | |
100 | address_buffer, | |
101 | sizeof(address_buffer))) != NULL) { | |
8e669ac1 | 102 | |
8523533c TK |
103 | spamd_address_container *this_spamd = |
104 | (spamd_address_container *)store_get(sizeof(spamd_address_container)); | |
8e669ac1 | 105 | |
8523533c TK |
106 | /* grok spamd address and port */ |
107 | if( sscanf(CS address, "%s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) { | |
108 | log_write(0, LOG_MAIN, | |
109 | "spam acl condition: warning - invalid spamd address: '%s'", address); | |
110 | continue; | |
111 | }; | |
8e669ac1 | 112 | |
8523533c TK |
113 | spamd_address_vector[num_servers] = this_spamd; |
114 | num_servers++; | |
115 | if (num_servers > 31) | |
116 | break; | |
117 | }; | |
8e669ac1 | 118 | |
8523533c TK |
119 | /* check if we have at least one server */ |
120 | if (!num_servers) { | |
121 | log_write(0, LOG_MAIN|LOG_PANIC, | |
122 | "spam acl condition: no useable spamd server addresses in spamd_address configuration option."); | |
123 | fclose(mbox_file); | |
124 | return DEFER; | |
125 | }; | |
126 | ||
127 | current_server = start_server = (int)now % num_servers; | |
128 | ||
129 | while (1) { | |
8e669ac1 | 130 | |
8523533c TK |
131 | debug_printf("trying server %s, port %u\n", |
132 | spamd_address_vector[current_server]->tcp_addr, | |
133 | spamd_address_vector[current_server]->tcp_port); | |
8e669ac1 | 134 | |
8523533c TK |
135 | /* contact a spamd */ |
136 | if ( (spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
137 | log_write(0, LOG_MAIN|LOG_PANIC, | |
138 | "spam acl condition: error creating IP socket for spamd"); | |
139 | fclose(mbox_file); | |
8e669ac1 | 140 | return DEFER; |
8523533c | 141 | }; |
8e669ac1 | 142 | |
8523533c TK |
143 | if (ip_connect( spamd_sock, |
144 | AF_INET, | |
145 | spamd_address_vector[current_server]->tcp_addr, | |
146 | spamd_address_vector[current_server]->tcp_port, | |
147 | 5 ) > -1) { | |
148 | /* connection OK */ | |
149 | break; | |
150 | }; | |
8e669ac1 | 151 | |
8523533c TK |
152 | log_write(0, LOG_MAIN|LOG_PANIC, |
153 | "spam acl condition: warning - spamd connection to %s, port %u failed: %s", | |
154 | spamd_address_vector[current_server]->tcp_addr, | |
155 | spamd_address_vector[current_server]->tcp_port, | |
156 | strerror(errno)); | |
157 | current_server++; | |
158 | if (current_server >= num_servers) | |
159 | current_server = 0; | |
160 | if (current_server == start_server) { | |
161 | log_write(0, LOG_MAIN|LOG_PANIC, "spam acl condition: all spamd servers failed"); | |
162 | fclose(mbox_file); | |
163 | close(spamd_sock); | |
164 | return DEFER; | |
165 | }; | |
166 | }; | |
167 | ||
168 | } | |
169 | else { | |
170 | /* open the local socket */ | |
171 | ||
172 | if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
173 | log_write(0, LOG_MAIN|LOG_PANIC, | |
174 | "malware acl condition: spamd: unable to acquire socket (%s)", | |
175 | strerror(errno)); | |
176 | fclose(mbox_file); | |
177 | return DEFER; | |
178 | } | |
179 | ||
180 | server.sun_family = AF_UNIX; | |
181 | Ustrcpy(server.sun_path, spamd_address); | |
182 | ||
183 | if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
184 | log_write(0, LOG_MAIN|LOG_PANIC, | |
185 | "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)", | |
186 | spamd_address, strerror(errno) ); | |
187 | fclose(mbox_file); | |
188 | close(spamd_sock); | |
189 | return DEFER; | |
190 | } | |
191 | ||
192 | } | |
193 | ||
194 | /* now we are connected to spamd on spamd_sock */ | |
195 | snprintf(CS spamd_buffer, | |
196 | sizeof(spamd_buffer), | |
f7b63901 | 197 | "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n", |
8523533c TK |
198 | user_name, |
199 | mbox_size); | |
200 | ||
201 | /* send our request */ | |
202 | if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) { | |
203 | close(spamd_sock); | |
204 | log_write(0, LOG_MAIN|LOG_PANIC, | |
205 | "spam acl condition: spamd send failed: %s", strerror(errno)); | |
206 | fclose(mbox_file); | |
207 | close(spamd_sock); | |
208 | return DEFER; | |
209 | }; | |
210 | ||
211 | /* now send the file */ | |
cfe75fc3 PH |
212 | /* spamd sometimes accepts conections but doesn't read data off |
213 | * the connection. We make the file descriptor non-blocking so | |
214 | * that the write will only write sufficient data without blocking | |
215 | * and we poll the desciptor to make sure that we can write without | |
216 | * blocking. Short writes are gracefully handled and if the whole | |
217 | * trasaction takes too long it is aborted. | |
f452e07e | 218 | * Note: poll() is not supported in OSX 10.2. |
cfe75fc3 | 219 | */ |
f452e07e | 220 | #ifndef NO_POLL_H |
cfe75fc3 PH |
221 | pollfd.fd = spamd_sock; |
222 | pollfd.events = POLLOUT; | |
f452e07e | 223 | #endif |
cfe75fc3 | 224 | fcntl(spamd_sock, F_SETFL, O_NONBLOCK); |
8523533c | 225 | do { |
cfe75fc3 PH |
226 | read = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file); |
227 | if (read > 0) { | |
228 | offset = 0; | |
229 | again: | |
f452e07e | 230 | #ifndef NO_POLL_H |
cfe75fc3 PH |
231 | result = poll(&pollfd, 1, 1000); |
232 | if (result == -1 && errno == EINTR) | |
233 | continue; | |
234 | else if (result < 1) { | |
235 | if (result == -1) | |
236 | log_write(0, LOG_MAIN|LOG_PANIC, | |
237 | "spam acl condition: %s on spamd socket", strerror(errno)); | |
238 | else { | |
239 | if (time(NULL) - start < SPAMD_TIMEOUT) | |
240 | goto again; | |
241 | log_write(0, LOG_MAIN|LOG_PANIC, | |
242 | "spam acl condition: timed out writing spamd socket"); | |
243 | } | |
8523533c TK |
244 | close(spamd_sock); |
245 | fclose(mbox_file); | |
246 | return DEFER; | |
cfe75fc3 | 247 | } |
f452e07e | 248 | #endif |
cfe75fc3 | 249 | wrote = send(spamd_sock,spamd_buffer + offset,read - offset,0); |
8d7d227d TK |
250 | if (wrote == -1) |
251 | { | |
252 | log_write(0, LOG_MAIN|LOG_PANIC, | |
253 | "spam acl condition: %s on spamd socket", strerror(errno)); | |
254 | close(spamd_sock); | |
255 | fclose(mbox_file); | |
256 | return DEFER; | |
257 | } | |
cfe75fc3 PH |
258 | if (offset + wrote != read) { |
259 | offset += wrote; | |
260 | goto again; | |
261 | } | |
262 | } | |
263 | } | |
264 | while (!feof(mbox_file) && !ferror(mbox_file)); | |
265 | if (ferror(mbox_file)) { | |
266 | log_write(0, LOG_MAIN|LOG_PANIC, | |
267 | "spam acl condition: error reading spool file: %s", strerror(errno)); | |
268 | close(spamd_sock); | |
269 | fclose(mbox_file); | |
270 | return DEFER; | |
8523533c | 271 | } |
8523533c TK |
272 | |
273 | fclose(mbox_file); | |
274 | ||
275 | /* we're done sending, close socket for writing */ | |
276 | shutdown(spamd_sock,SHUT_WR); | |
8e669ac1 | 277 | |
cfe75fc3 PH |
278 | /* read spamd response using what's left of the timeout. |
279 | */ | |
8523533c TK |
280 | memset(spamd_buffer, 0, sizeof(spamd_buffer)); |
281 | offset = 0; | |
282 | while((i = ip_recv(spamd_sock, | |
283 | spamd_buffer + offset, | |
284 | sizeof(spamd_buffer) - offset - 1, | |
cfe75fc3 | 285 | SPAMD_TIMEOUT - time(NULL) + start)) > 0 ) { |
8523533c TK |
286 | offset += i; |
287 | } | |
288 | ||
289 | /* error handling */ | |
290 | if((i <= 0) && (errno != 0)) { | |
291 | log_write(0, LOG_MAIN|LOG_PANIC, | |
292 | "spam acl condition: error reading from spamd socket: %s", strerror(errno)); | |
293 | close(spamd_sock); | |
294 | return DEFER; | |
295 | } | |
296 | ||
297 | /* reading done */ | |
298 | close(spamd_sock); | |
299 | ||
300 | /* dig in the spamd output and put the report in a multiline header, if requested */ | |
301 | if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n", | |
302 | spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) { | |
8e669ac1 | 303 | |
8523533c TK |
304 | /* try to fall back to pre-2.50 spamd output */ |
305 | if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n", | |
306 | spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) { | |
307 | log_write(0, LOG_MAIN|LOG_PANIC, | |
308 | "spam acl condition: cannot parse spamd output"); | |
309 | return DEFER; | |
310 | }; | |
311 | }; | |
312 | ||
313 | /* Create report. Since this is a multiline string, | |
314 | we must hack it into shape first */ | |
315 | p = &spamd_buffer[spamd_report_offset]; | |
316 | q = spam_report_buffer; | |
317 | while (*p != '\0') { | |
318 | /* skip \r */ | |
319 | if (*p == '\r') { | |
320 | p++; | |
321 | continue; | |
322 | }; | |
323 | *q = *p; | |
324 | q++; | |
325 | if (*p == '\n') { | |
326 | *q = '\t'; | |
327 | q++; | |
328 | /* eat whitespace */ | |
329 | while( (*p <= ' ') && (*p != '\0') ) { | |
330 | p++; | |
331 | }; | |
332 | p--; | |
333 | }; | |
334 | p++; | |
335 | }; | |
336 | /* NULL-terminate */ | |
337 | *q = '\0'; | |
338 | q--; | |
339 | /* cut off trailing leftovers */ | |
340 | while (*q <= ' ') { | |
341 | *q = '\0'; | |
342 | q--; | |
343 | }; | |
344 | spam_report = spam_report_buffer; | |
345 | ||
346 | /* create spam bar */ | |
347 | spamd_score_char = spamd_score > 0 ? '+' : '-'; | |
348 | j = abs((int)(spamd_score)); | |
349 | i = 0; | |
350 | if( j != 0 ) { | |
351 | while((i < j) && (i <= MAX_SPAM_BAR_CHARS)) | |
352 | spam_bar_buffer[i++] = spamd_score_char; | |
353 | } | |
354 | else{ | |
355 | spam_bar_buffer[0] = '/'; | |
356 | i = 1; | |
357 | } | |
358 | spam_bar_buffer[i] = '\0'; | |
359 | spam_bar = spam_bar_buffer; | |
360 | ||
361 | /* create "float" spam score */ | |
362 | snprintf(CS spam_score_buffer, sizeof(spam_score_buffer),"%.1f", spamd_score); | |
363 | spam_score = spam_score_buffer; | |
364 | ||
365 | /* create "int" spam score */ | |
366 | j = (int)((spamd_score + 0.001)*10); | |
367 | snprintf(CS spam_score_int_buffer, sizeof(spam_score_int_buffer), "%d", j); | |
368 | spam_score_int = spam_score_int_buffer; | |
369 | ||
370 | /* compare threshold against score */ | |
371 | if (spamd_score >= spamd_threshold) { | |
372 | /* spam as determined by user's threshold */ | |
373 | spam_rc = OK; | |
374 | } | |
375 | else { | |
376 | /* not spam */ | |
377 | spam_rc = FAIL; | |
378 | }; | |
8e669ac1 | 379 | |
8523533c TK |
380 | /* remember user name and "been here" for it */ |
381 | Ustrcpy(prev_user_name, user_name); | |
382 | spam_ok = 1; | |
8e669ac1 | 383 | |
8523533c TK |
384 | if (override) { |
385 | /* always return OK, no matter what the score */ | |
386 | return OK; | |
387 | } | |
388 | else { | |
389 | return spam_rc; | |
390 | }; | |
391 | } | |
392 | ||
393 | #endif |