Commit | Line | Data |
---|---|---|
8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */ | |
6 | /* License: GPL */ | |
7 | ||
8 | /* Code for calling spamassassin's spamd. Called from acl.c. */ | |
9 | ||
10 | #include "exim.h" | |
11 | #ifdef WITH_CONTENT_SCAN | |
12 | #include "spam.h" | |
13 | ||
14 | uschar spam_score_buffer[16]; | |
15 | uschar spam_score_int_buffer[16]; | |
16 | uschar spam_bar_buffer[128]; | |
17 | uschar spam_report_buffer[32600]; | |
18 | uschar prev_user_name[128] = ""; | |
19 | int spam_ok = 0; | |
20 | int spam_rc = 0; | |
f7274286 | 21 | uschar *prev_spamd_address_work = NULL; |
8523533c | 22 | |
c007c974 JH |
23 | int |
24 | spam(uschar **listptr) | |
25 | { | |
8523533c TK |
26 | int sep = 0; |
27 | uschar *list = *listptr; | |
28 | uschar *user_name; | |
29 | uschar user_name_buffer[128]; | |
f7b63901 | 30 | unsigned long mbox_size; |
8523533c | 31 | FILE *mbox_file; |
0f501486 | 32 | int spamd_sock = -1; |
8523533c | 33 | uschar spamd_buffer[32600]; |
cfe75fc3 | 34 | int i, j, offset, result; |
8523533c TK |
35 | uschar spamd_version[8]; |
36 | uschar spamd_score_char; | |
37 | double spamd_threshold, spamd_score; | |
38 | int spamd_report_offset; | |
39 | uschar *p,*q; | |
40 | int override = 0; | |
cfe75fc3 PH |
41 | time_t start; |
42 | size_t read, wrote; | |
8523533c | 43 | struct sockaddr_un server; |
f452e07e | 44 | #ifndef NO_POLL_H |
cfe75fc3 | 45 | struct pollfd pollfd; |
25257489 PH |
46 | #else /* Patch posted by Erik ? for OS X */ |
47 | struct timeval select_tv; /* and applied by PH */ | |
48 | fd_set select_fd; | |
f452e07e | 49 | #endif |
b6e6e716 | 50 | uschar *spamd_address_work; |
8523533c | 51 | |
5614ee86 | 52 | /* stop compiler warning */ |
91ecef39 | 53 | result = 0; |
5614ee86 | 54 | |
8523533c TK |
55 | /* find the username from the option list */ |
56 | if ((user_name = string_nextinlist(&list, &sep, | |
57 | user_name_buffer, | |
ddcf2b5f JH |
58 | sizeof(user_name_buffer))) == NULL) |
59 | { | |
8523533c TK |
60 | /* no username given, this means no scanning should be done */ |
61 | return FAIL; | |
ddcf2b5f | 62 | } |
8523533c TK |
63 | |
64 | /* if username is "0" or "false", do not scan */ | |
65 | if ( (Ustrcmp(user_name,"0") == 0) || | |
ddcf2b5f | 66 | (strcmpic(user_name,US"false") == 0) ) |
8523533c | 67 | return FAIL; |
8523533c TK |
68 | |
69 | /* if there is an additional option, check if it is "true" */ | |
ddcf2b5f | 70 | if (strcmpic(list,US"true") == 0) |
8523533c TK |
71 | /* in that case, always return true later */ |
72 | override = 1; | |
8523533c | 73 | |
f7274286 | 74 | /* expand spamd_address if needed */ |
ddcf2b5f JH |
75 | if (*spamd_address == '$') |
76 | { | |
f7274286 | 77 | spamd_address_work = expand_string(spamd_address); |
ddcf2b5f JH |
78 | if (spamd_address_work == NULL) |
79 | { | |
f7274286 PP |
80 | log_write(0, LOG_MAIN|LOG_PANIC, |
81 | "spamassassin acl condition: spamd_address starts with $, but expansion failed: %s", expand_string_message); | |
82 | return DEFER; | |
ddcf2b5f | 83 | } |
f7274286 | 84 | } |
f7274286 PP |
85 | else |
86 | spamd_address_work = spamd_address; | |
87 | ||
88 | /* check if previous spamd_address was expanded and has changed. dump cached results if so */ | |
ddcf2b5f JH |
89 | if ( spam_ok |
90 | && prev_spamd_address_work != NULL | |
91 | && Ustrcmp(prev_spamd_address_work, spamd_address_work) != 0 | |
92 | ) | |
f7274286 | 93 | spam_ok = 0; |
f7274286 | 94 | |
8e669ac1 | 95 | /* if we scanned for this username last time, just return */ |
ddcf2b5f | 96 | if ( spam_ok && Ustrcmp(prev_user_name, user_name) == 0) |
8523533c TK |
97 | if (override) |
98 | return OK; | |
99 | else | |
100 | return spam_rc; | |
8e669ac1 | 101 | |
8523533c | 102 | /* make sure the eml mbox file is spooled up */ |
8544e77a | 103 | mbox_file = spool_mbox(&mbox_size, NULL); |
8e669ac1 | 104 | |
ddcf2b5f JH |
105 | if (mbox_file == NULL) |
106 | { | |
8523533c TK |
107 | /* error while spooling */ |
108 | log_write(0, LOG_MAIN|LOG_PANIC, | |
109 | "spam acl condition: error while creating mbox spool file"); | |
110 | return DEFER; | |
ddcf2b5f | 111 | } |
8523533c | 112 | |
cfe75fc3 | 113 | start = time(NULL); |
b6e6e716 | 114 | |
8523533c | 115 | /* socket does not start with '/' -> network socket */ |
ddcf2b5f JH |
116 | if (*spamd_address_work != '/') |
117 | { | |
8523533c | 118 | int num_servers = 0; |
29cfeb94 | 119 | int current_server; |
8523533c | 120 | uschar *address = NULL; |
e1e7cfcb | 121 | uschar *spamd_address_list_ptr = spamd_address_work; |
8523533c TK |
122 | uschar address_buffer[256]; |
123 | spamd_address_container * spamd_address_vector[32]; | |
124 | ||
125 | /* Check how many spamd servers we have | |
126 | and register their addresses */ | |
127 | while ((address = string_nextinlist(&spamd_address_list_ptr, &sep, | |
128 | address_buffer, | |
ddcf2b5f JH |
129 | sizeof(address_buffer))) != NULL) |
130 | { | |
8e669ac1 | 131 | |
29cfeb94 | 132 | /* Potential memory leak as we never free the store. */ |
8523533c TK |
133 | spamd_address_container *this_spamd = |
134 | (spamd_address_container *)store_get(sizeof(spamd_address_container)); | |
8e669ac1 | 135 | |
8523533c | 136 | /* grok spamd address and port */ |
e252eb8c JH |
137 | if (sscanf(CS address, "%23s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2) |
138 | { | |
8523533c TK |
139 | log_write(0, LOG_MAIN, |
140 | "spam acl condition: warning - invalid spamd address: '%s'", address); | |
141 | continue; | |
ddcf2b5f | 142 | } |
8e669ac1 | 143 | |
8523533c | 144 | spamd_address_vector[num_servers] = this_spamd; |
ddcf2b5f | 145 | if (++num_servers > 31) |
8523533c | 146 | break; |
ddcf2b5f | 147 | } |
8e669ac1 | 148 | |
8523533c | 149 | /* check if we have at least one server */ |
ddcf2b5f JH |
150 | if (!num_servers) |
151 | { | |
8523533c TK |
152 | log_write(0, LOG_MAIN|LOG_PANIC, |
153 | "spam acl condition: no useable spamd server addresses in spamd_address configuration option."); | |
f1e894f3 | 154 | (void)fclose(mbox_file); |
8523533c | 155 | return DEFER; |
ddcf2b5f | 156 | } |
8523533c | 157 | |
ddcf2b5f JH |
158 | while ( num_servers > 0 ) |
159 | { | |
2e64baa9 | 160 | int i; |
8523533c | 161 | |
29cfeb94 PP |
162 | /* Randomly pick a server to try */ |
163 | current_server = random_number( num_servers ); | |
8e669ac1 | 164 | |
8523533c TK |
165 | debug_printf("trying server %s, port %u\n", |
166 | spamd_address_vector[current_server]->tcp_addr, | |
167 | spamd_address_vector[current_server]->tcp_port); | |
8e669ac1 | 168 | |
8523533c | 169 | /* contact a spamd */ |
ddcf2b5f JH |
170 | if ( (spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) |
171 | { | |
8523533c TK |
172 | log_write(0, LOG_MAIN|LOG_PANIC, |
173 | "spam acl condition: error creating IP socket for spamd"); | |
f1e894f3 | 174 | (void)fclose(mbox_file); |
8e669ac1 | 175 | return DEFER; |
ddcf2b5f | 176 | } |
8e669ac1 | 177 | |
8523533c TK |
178 | if (ip_connect( spamd_sock, |
179 | AF_INET, | |
180 | spamd_address_vector[current_server]->tcp_addr, | |
181 | spamd_address_vector[current_server]->tcp_port, | |
ddcf2b5f | 182 | 5 ) > -1) |
8523533c TK |
183 | /* connection OK */ |
184 | break; | |
8e669ac1 | 185 | |
8523533c TK |
186 | log_write(0, LOG_MAIN|LOG_PANIC, |
187 | "spam acl condition: warning - spamd connection to %s, port %u failed: %s", | |
188 | spamd_address_vector[current_server]->tcp_addr, | |
189 | spamd_address_vector[current_server]->tcp_port, | |
190 | strerror(errno)); | |
29cfeb94 PP |
191 | |
192 | (void)close(spamd_sock); | |
193 | ||
194 | /* Remove the server from the list. XXX We should free the memory */ | |
195 | num_servers--; | |
ddcf2b5f | 196 | for ( i = current_server; i < num_servers; i++ ) |
29cfeb94 | 197 | spamd_address_vector[i] = spamd_address_vector[i+1]; |
ddcf2b5f | 198 | } |
29cfeb94 | 199 | |
ddcf2b5f JH |
200 | if ( num_servers == 0 ) |
201 | { | |
29cfeb94 PP |
202 | log_write(0, LOG_MAIN|LOG_PANIC, "spam acl condition: all spamd servers failed"); |
203 | (void)fclose(mbox_file); | |
204 | return DEFER; | |
ddcf2b5f | 205 | } |
29cfeb94 | 206 | } |
ddcf2b5f JH |
207 | else |
208 | { | |
8523533c TK |
209 | /* open the local socket */ |
210 | ||
ddcf2b5f JH |
211 | if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) |
212 | { | |
8523533c TK |
213 | log_write(0, LOG_MAIN|LOG_PANIC, |
214 | "malware acl condition: spamd: unable to acquire socket (%s)", | |
215 | strerror(errno)); | |
f1e894f3 | 216 | (void)fclose(mbox_file); |
8523533c | 217 | return DEFER; |
ddcf2b5f | 218 | } |
8523533c TK |
219 | |
220 | server.sun_family = AF_UNIX; | |
b6e6e716 | 221 | Ustrcpy(server.sun_path, spamd_address_work); |
8523533c | 222 | |
ddcf2b5f JH |
223 | if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) |
224 | { | |
8523533c TK |
225 | log_write(0, LOG_MAIN|LOG_PANIC, |
226 | "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)", | |
b6e6e716 | 227 | spamd_address_work, strerror(errno) ); |
f1e894f3 PH |
228 | (void)fclose(mbox_file); |
229 | (void)close(spamd_sock); | |
8523533c | 230 | return DEFER; |
ddcf2b5f | 231 | } |
8523533c TK |
232 | } |
233 | ||
ddcf2b5f JH |
234 | if (spamd_sock == -1) |
235 | { | |
0f501486 PP |
236 | log_write(0, LOG_MAIN|LOG_PANIC, |
237 | "programming fault, spamd_sock unexpectedly unset"); | |
238 | (void)fclose(mbox_file); | |
239 | (void)close(spamd_sock); | |
240 | return DEFER; | |
ddcf2b5f | 241 | } |
0f501486 | 242 | |
8523533c | 243 | /* now we are connected to spamd on spamd_sock */ |
b07e6aa3 | 244 | (void)string_format(spamd_buffer, |
8523533c | 245 | sizeof(spamd_buffer), |
f7b63901 | 246 | "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n", |
8523533c TK |
247 | user_name, |
248 | mbox_size); | |
249 | ||
250 | /* send our request */ | |
ddcf2b5f JH |
251 | if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) |
252 | { | |
f1e894f3 | 253 | (void)close(spamd_sock); |
8523533c TK |
254 | log_write(0, LOG_MAIN|LOG_PANIC, |
255 | "spam acl condition: spamd send failed: %s", strerror(errno)); | |
f1e894f3 PH |
256 | (void)fclose(mbox_file); |
257 | (void)close(spamd_sock); | |
8523533c | 258 | return DEFER; |
ddcf2b5f | 259 | } |
8523533c TK |
260 | |
261 | /* now send the file */ | |
cfe75fc3 PH |
262 | /* spamd sometimes accepts conections but doesn't read data off |
263 | * the connection. We make the file descriptor non-blocking so | |
264 | * that the write will only write sufficient data without blocking | |
265 | * and we poll the desciptor to make sure that we can write without | |
266 | * blocking. Short writes are gracefully handled and if the whole | |
267 | * trasaction takes too long it is aborted. | |
25257489 PH |
268 | * Note: poll() is not supported in OSX 10.2 and is reported to be |
269 | * broken in more recent versions (up to 10.4). | |
cfe75fc3 | 270 | */ |
f452e07e | 271 | #ifndef NO_POLL_H |
cfe75fc3 PH |
272 | pollfd.fd = spamd_sock; |
273 | pollfd.events = POLLOUT; | |
f452e07e | 274 | #endif |
ff790e47 | 275 | (void)fcntl(spamd_sock, F_SETFL, O_NONBLOCK); |
ddcf2b5f JH |
276 | do |
277 | { | |
cfe75fc3 | 278 | read = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file); |
ddcf2b5f JH |
279 | if (read > 0) |
280 | { | |
cfe75fc3 PH |
281 | offset = 0; |
282 | again: | |
f452e07e | 283 | #ifndef NO_POLL_H |
cfe75fc3 | 284 | result = poll(&pollfd, 1, 1000); |
25257489 PH |
285 | |
286 | /* Patch posted by Erik ? for OS X and applied by PH */ | |
287 | #else | |
288 | select_tv.tv_sec = 1; | |
289 | select_tv.tv_usec = 0; | |
290 | FD_ZERO(&select_fd); | |
291 | FD_SET(spamd_sock, &select_fd); | |
292 | result = select(spamd_sock+1, NULL, &select_fd, NULL, &select_tv); | |
293 | #endif | |
294 | /* End Erik's patch */ | |
295 | ||
cfe75fc3 | 296 | if (result == -1 && errno == EINTR) |
25257489 | 297 | goto again; |
ddcf2b5f JH |
298 | else if (result < 1) |
299 | { | |
cfe75fc3 PH |
300 | if (result == -1) |
301 | log_write(0, LOG_MAIN|LOG_PANIC, | |
302 | "spam acl condition: %s on spamd socket", strerror(errno)); | |
ddcf2b5f JH |
303 | else |
304 | { | |
cfe75fc3 | 305 | if (time(NULL) - start < SPAMD_TIMEOUT) |
c007c974 | 306 | goto again; |
cfe75fc3 PH |
307 | log_write(0, LOG_MAIN|LOG_PANIC, |
308 | "spam acl condition: timed out writing spamd socket"); | |
ddcf2b5f | 309 | } |
f1e894f3 PH |
310 | (void)close(spamd_sock); |
311 | (void)fclose(mbox_file); | |
8523533c | 312 | return DEFER; |
ddcf2b5f | 313 | } |
25257489 | 314 | |
cfe75fc3 | 315 | wrote = send(spamd_sock,spamd_buffer + offset,read - offset,0); |
8d7d227d | 316 | if (wrote == -1) |
ddcf2b5f JH |
317 | { |
318 | log_write(0, LOG_MAIN|LOG_PANIC, | |
8d7d227d | 319 | "spam acl condition: %s on spamd socket", strerror(errno)); |
f1e894f3 PH |
320 | (void)close(spamd_sock); |
321 | (void)fclose(mbox_file); | |
8d7d227d | 322 | return DEFER; |
ddcf2b5f JH |
323 | } |
324 | if (offset + wrote != read) | |
325 | { | |
cfe75fc3 PH |
326 | offset += wrote; |
327 | goto again; | |
ddcf2b5f | 328 | } |
cfe75fc3 PH |
329 | } |
330 | } | |
cfe75fc3 | 331 | while (!feof(mbox_file) && !ferror(mbox_file)); |
ddcf2b5f JH |
332 | |
333 | if (ferror(mbox_file)) | |
334 | { | |
cfe75fc3 PH |
335 | log_write(0, LOG_MAIN|LOG_PANIC, |
336 | "spam acl condition: error reading spool file: %s", strerror(errno)); | |
f1e894f3 PH |
337 | (void)close(spamd_sock); |
338 | (void)fclose(mbox_file); | |
cfe75fc3 | 339 | return DEFER; |
ddcf2b5f | 340 | } |
8523533c | 341 | |
f1e894f3 | 342 | (void)fclose(mbox_file); |
8523533c TK |
343 | |
344 | /* we're done sending, close socket for writing */ | |
345 | shutdown(spamd_sock,SHUT_WR); | |
8e669ac1 | 346 | |
cfe75fc3 PH |
347 | /* read spamd response using what's left of the timeout. |
348 | */ | |
8523533c TK |
349 | memset(spamd_buffer, 0, sizeof(spamd_buffer)); |
350 | offset = 0; | |
ddcf2b5f | 351 | while ((i = ip_recv(spamd_sock, |
8523533c TK |
352 | spamd_buffer + offset, |
353 | sizeof(spamd_buffer) - offset - 1, | |
ddcf2b5f | 354 | SPAMD_TIMEOUT - time(NULL) + start)) > 0 ) |
8523533c | 355 | offset += i; |
8523533c TK |
356 | |
357 | /* error handling */ | |
ddcf2b5f JH |
358 | if (i <= 0 && errno != 0) |
359 | { | |
8523533c TK |
360 | log_write(0, LOG_MAIN|LOG_PANIC, |
361 | "spam acl condition: error reading from spamd socket: %s", strerror(errno)); | |
f1e894f3 | 362 | (void)close(spamd_sock); |
8523533c | 363 | return DEFER; |
ddcf2b5f | 364 | } |
8523533c TK |
365 | |
366 | /* reading done */ | |
f1e894f3 | 367 | (void)close(spamd_sock); |
8523533c TK |
368 | |
369 | /* dig in the spamd output and put the report in a multiline header, if requested */ | |
ddcf2b5f JH |
370 | if (sscanf(CS spamd_buffer, |
371 | "SPAMD/%7s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n", | |
372 | spamd_version, &spamd_score, &spamd_threshold, | |
373 | &spamd_report_offset) != 3) | |
374 | { | |
8e669ac1 | 375 | |
8523533c | 376 | /* try to fall back to pre-2.50 spamd output */ |
ddcf2b5f JH |
377 | if (sscanf(CS spamd_buffer, |
378 | "SPAMD/%7s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n", | |
379 | spamd_version, &spamd_score, &spamd_threshold, | |
380 | &spamd_report_offset) != 3 ) | |
381 | { | |
8523533c TK |
382 | log_write(0, LOG_MAIN|LOG_PANIC, |
383 | "spam acl condition: cannot parse spamd output"); | |
384 | return DEFER; | |
ddcf2b5f JH |
385 | } |
386 | } | |
8523533c TK |
387 | |
388 | /* Create report. Since this is a multiline string, | |
389 | we must hack it into shape first */ | |
390 | p = &spamd_buffer[spamd_report_offset]; | |
391 | q = spam_report_buffer; | |
ddcf2b5f JH |
392 | while (*p != '\0') |
393 | { | |
8523533c | 394 | /* skip \r */ |
ddcf2b5f JH |
395 | if (*p == '\r') |
396 | { | |
8523533c TK |
397 | p++; |
398 | continue; | |
ddcf2b5f JH |
399 | } |
400 | *q++ = *p; | |
401 | if (*p++ == '\n') | |
402 | { | |
89dec7b6 TF |
403 | /* add an extra space after the newline to ensure |
404 | that it is treated as a header continuation line */ | |
ddcf2b5f JH |
405 | *q++ = ' '; |
406 | } | |
407 | } | |
8523533c | 408 | /* NULL-terminate */ |
ddcf2b5f | 409 | *q-- = '\0'; |
8523533c | 410 | /* cut off trailing leftovers */ |
ddcf2b5f JH |
411 | while (*q <= ' ') |
412 | *q-- = '\0'; | |
413 | ||
8523533c TK |
414 | spam_report = spam_report_buffer; |
415 | ||
416 | /* create spam bar */ | |
417 | spamd_score_char = spamd_score > 0 ? '+' : '-'; | |
418 | j = abs((int)(spamd_score)); | |
419 | i = 0; | |
ddcf2b5f JH |
420 | if (j != 0) |
421 | while ((i < j) && (i <= MAX_SPAM_BAR_CHARS)) | |
8523533c | 422 | spam_bar_buffer[i++] = spamd_score_char; |
ddcf2b5f JH |
423 | else |
424 | { | |
8523533c TK |
425 | spam_bar_buffer[0] = '/'; |
426 | i = 1; | |
ddcf2b5f | 427 | } |
8523533c TK |
428 | spam_bar_buffer[i] = '\0'; |
429 | spam_bar = spam_bar_buffer; | |
430 | ||
431 | /* create "float" spam score */ | |
b07e6aa3 | 432 | (void)string_format(spam_score_buffer, sizeof(spam_score_buffer),"%.1f", spamd_score); |
8523533c TK |
433 | spam_score = spam_score_buffer; |
434 | ||
435 | /* create "int" spam score */ | |
436 | j = (int)((spamd_score + 0.001)*10); | |
b07e6aa3 | 437 | (void)string_format(spam_score_int_buffer, sizeof(spam_score_int_buffer), "%d", j); |
8523533c TK |
438 | spam_score_int = spam_score_int_buffer; |
439 | ||
440 | /* compare threshold against score */ | |
ddcf2b5f JH |
441 | if (spamd_score >= spamd_threshold) |
442 | { | |
8523533c TK |
443 | /* spam as determined by user's threshold */ |
444 | spam_rc = OK; | |
ddcf2b5f JH |
445 | } |
446 | else | |
447 | { | |
8523533c TK |
448 | /* not spam */ |
449 | spam_rc = FAIL; | |
ddcf2b5f | 450 | } |
8e669ac1 | 451 | |
f7274286 | 452 | /* remember expanded spamd_address if needed */ |
ddcf2b5f | 453 | if (spamd_address_work != spamd_address) |
f7274286 | 454 | prev_spamd_address_work = string_copy(spamd_address_work); |
ddcf2b5f | 455 | |
f7274286 PP |
456 | /* remember user name and "been here" for it */ |
457 | Ustrcpy(prev_user_name, user_name); | |
458 | spam_ok = 1; | |
8e669ac1 | 459 | |
ddcf2b5f | 460 | if (override) /* always return OK, no matter what the score */ |
8523533c | 461 | return OK; |
ddcf2b5f | 462 | else |
8523533c | 463 | return spam_rc; |
8523533c TK |
464 | } |
465 | ||
466 | #endif |