Commit | Line | Data |
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5ca6d115 | 1 | /* $Cambridge: exim/src/src/malware.c,v 1.17 2009/11/05 19:40:51 nm4 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 virus (malware) scanners. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
13 | #ifdef WITH_CONTENT_SCAN | |
14 | ||
15 | /* declaration of private routines */ | |
16 | int mksd_scan_packed(int sock); | |
17 | ||
18 | /* SHUT_WR seems to be undefined on Unixware? */ | |
19 | #ifndef SHUT_WR | |
20 | #define SHUT_WR 1 | |
21 | #endif | |
22 | ||
a9ccd69a PH |
23 | |
24 | #define MALWARE_TIMEOUT 120 | |
25 | ||
26 | ||
8523533c TK |
27 | #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ |
28 | #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
29 | #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
30 | ||
2376f2f5 TK |
31 | #define DERR_READ_ERR (1<<0) /* read error */ |
32 | #define DERR_NOMEMORY (1<<2) /* no memory */ | |
33 | #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
34 | #define DERR_BAD_CALL (1<<15) /* wrong command */ | |
35 | ||
8e669ac1 | 36 | /* Routine to check whether a system is big- or litte-endian. |
8523533c TK |
37 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
38 | Needed for proper kavdaemon implementation. Sigh. */ | |
39 | #define BIG_MY_ENDIAN 0 | |
40 | #define LITTLE_MY_ENDIAN 1 | |
41 | int test_byte_order(void); | |
42 | int test_byte_order() { | |
43 | short int word = 0x0001; | |
44 | char *byte = (char *) &word; | |
45 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); | |
46 | } | |
47 | ||
48 | uschar malware_name_buffer[256]; | |
49 | int malware_ok = 0; | |
50 | ||
51 | int malware(uschar **listptr) { | |
52 | int sep = 0; | |
53 | uschar *list = *listptr; | |
54 | uschar *av_scanner_work = av_scanner; | |
55 | uschar *scanner_name; | |
56 | uschar scanner_name_buffer[16]; | |
57 | uschar *malware_regex; | |
58 | uschar malware_regex_buffer[64]; | |
59 | uschar malware_regex_default[] = ".+"; | |
f7b63901 | 60 | unsigned long mbox_size; |
8523533c TK |
61 | FILE *mbox_file; |
62 | int roffset; | |
63 | const pcre *re; | |
64 | const uschar *rerror; | |
8e669ac1 | 65 | |
8523533c TK |
66 | /* make sure the eml mbox file is spooled up */ |
67 | mbox_file = spool_mbox(&mbox_size); | |
68 | if (mbox_file == NULL) { | |
69 | /* error while spooling */ | |
70 | log_write(0, LOG_MAIN|LOG_PANIC, | |
71 | "malware acl condition: error while creating mbox spool file"); | |
8e669ac1 | 72 | return DEFER; |
8523533c TK |
73 | }; |
74 | /* none of our current scanners need the mbox | |
75 | file as a stream, so we can close it right away */ | |
f1e894f3 | 76 | (void)fclose(mbox_file); |
8e669ac1 | 77 | |
8523533c TK |
78 | /* extract the malware regex to match against from the option list */ |
79 | if ((malware_regex = string_nextinlist(&list, &sep, | |
80 | malware_regex_buffer, | |
81 | sizeof(malware_regex_buffer))) != NULL) { | |
8e669ac1 | 82 | |
8523533c | 83 | /* parse 1st option */ |
8e669ac1 | 84 | if ( (strcmpic(malware_regex,US"false") == 0) || |
8523533c TK |
85 | (Ustrcmp(malware_regex,"0") == 0) ) { |
86 | /* explicitly no matching */ | |
87 | return FAIL; | |
88 | }; | |
8e669ac1 | 89 | |
8523533c | 90 | /* special cases (match anything except empty) */ |
8e669ac1 PH |
91 | if ( (strcmpic(malware_regex,US"true") == 0) || |
92 | (Ustrcmp(malware_regex,"*") == 0) || | |
8523533c TK |
93 | (Ustrcmp(malware_regex,"1") == 0) ) { |
94 | malware_regex = malware_regex_default; | |
95 | }; | |
96 | } | |
97 | else { | |
98 | /* empty means "don't match anything" */ | |
99 | return FAIL; | |
100 | }; | |
101 | ||
ee873c8c TK |
102 | /* Reset sep that is set by previous string_nextinlist() call */ |
103 | sep = 0; | |
104 | ||
8523533c TK |
105 | /* compile the regex, see if it works */ |
106 | re = pcre_compile(CS malware_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
107 | if (re == NULL) { | |
108 | log_write(0, LOG_MAIN|LOG_PANIC, | |
109 | "malware acl condition: regular expression error in '%s': %s at offset %d", malware_regex, rerror, roffset); | |
110 | return DEFER; | |
111 | }; | |
112 | ||
113 | /* if av_scanner starts with a dollar, expand it first */ | |
114 | if (*av_scanner == '$') { | |
115 | av_scanner_work = expand_string(av_scanner); | |
116 | if (av_scanner_work == NULL) { | |
117 | log_write(0, LOG_MAIN|LOG_PANIC, | |
118 | "malware acl condition: av_scanner starts with $, but expansion failed: %s", expand_string_message); | |
119 | return DEFER; | |
120 | } | |
121 | else { | |
122 | debug_printf("Expanded av_scanner global: %s\n", av_scanner_work); | |
123 | /* disable result caching in this case */ | |
124 | malware_name = NULL; | |
125 | malware_ok = 0; | |
126 | }; | |
127 | } | |
128 | ||
129 | /* Do not scan twice. */ | |
130 | if (malware_ok == 0) { | |
131 | ||
132 | /* find the scanner type from the av_scanner option */ | |
133 | if ((scanner_name = string_nextinlist(&av_scanner_work, &sep, | |
134 | scanner_name_buffer, | |
135 | sizeof(scanner_name_buffer))) == NULL) { | |
136 | /* no scanner given */ | |
137 | log_write(0, LOG_MAIN|LOG_PANIC, | |
138 | "malware acl condition: av_scanner configuration variable is empty"); | |
139 | return DEFER; | |
140 | }; | |
8e669ac1 | 141 | |
e5496194 TK |
142 | /* "f-protd" scanner type ----------------------------------------------- */ |
143 | if (strcmpic(scanner_name, US"f-protd") == 0) { | |
144 | uschar *fp_options, *fp_scan_option; | |
145 | uschar fp_scan_option_buffer[1024]; | |
146 | uschar fp_options_buffer[1024]; | |
147 | uschar fp_options_default[] = "localhost 10200-10204"; | |
148 | uschar hostname[256]; | |
149 | unsigned int port, portlow, porthigh, connect_ok=0, detected=0, par_count = 0; | |
150 | struct hostent *he; | |
151 | struct in_addr in; | |
152 | int sock; | |
153 | uschar scanrequest[2048], buf[32768], *strhelper, *strhelper2; | |
154 | ||
155 | if ((fp_options = string_nextinlist(&av_scanner_work, &sep, | |
156 | fp_options_buffer, sizeof(fp_options_buffer))) == NULL) { | |
157 | /* no options supplied, use default options */ | |
158 | fp_options = fp_options_default; | |
159 | }; | |
160 | ||
161 | /* extract host and port part */ | |
162 | if ( sscanf(CS fp_options, "%s %u-%u", hostname, &portlow, &porthigh) != 3 ) { | |
163 | if ( sscanf(CS fp_options, "%s %u", hostname, &portlow) != 2 ) { | |
164 | log_write(0, LOG_MAIN|LOG_PANIC, | |
165 | "malware acl condition: f-protd: invalid socket '%s'", fp_options); | |
166 | return DEFER; | |
167 | } | |
168 | porthigh = portlow; | |
169 | } | |
170 | ||
171 | /* Lookup the host */ | |
172 | if((he = gethostbyname(CS hostname)) == 0) { | |
173 | log_write(0, LOG_MAIN|LOG_PANIC, | |
174 | "malware acl condition: f-protd: failed to lookup host '%s'", hostname); | |
175 | return DEFER; | |
176 | } | |
177 | ||
178 | in = *(struct in_addr *) he->h_addr_list[0]; | |
179 | port = portlow; | |
180 | ||
181 | ||
182 | /* Open the f-protd TCP socket */ | |
183 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
184 | log_write(0, LOG_MAIN|LOG_PANIC, | |
185 | "malware acl condition: f-protd: unable to acquire socket (%s)", | |
186 | strerror(errno)); | |
187 | return DEFER; | |
188 | } | |
189 | ||
190 | /* Try to connect to all portslow-high until connection is established */ | |
191 | for (port = portlow; !connect_ok && port < porthigh; port++) { | |
192 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0) { | |
193 | connect_ok = 1; | |
194 | } | |
195 | } | |
196 | ||
197 | if ( !connect_ok ) { | |
198 | log_write(0, LOG_MAIN|LOG_PANIC, | |
199 | "malware acl condition: f-protd: connection to %s, port %u-%u failed (%s)", | |
200 | inet_ntoa(in), portlow, porthigh, strerror(errno)); | |
201 | (void)close(sock); | |
202 | return DEFER; | |
203 | } | |
204 | ||
205 | (void)string_format(scanrequest, 1024, CS"GET %s/scan/%s/%s.eml", | |
206 | spool_directory, message_id, message_id); | |
207 | ||
208 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, | |
209 | fp_scan_option_buffer, sizeof(fp_scan_option_buffer))) != NULL) { | |
210 | if ( par_count ) { | |
211 | Ustrcat(scanrequest, "%20"); | |
212 | } else { | |
213 | Ustrcat(scanrequest, "?"); | |
214 | } | |
215 | Ustrcat(scanrequest, fp_scan_option); | |
216 | par_count++; | |
217 | } | |
218 | Ustrcat(scanrequest, " HTTP/1.0\r\n\r\n"); | |
219 | ||
220 | /* send scan request */ | |
221 | if (send(sock, &scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
222 | (void)close(sock); | |
223 | log_write(0, LOG_MAIN|LOG_PANIC, | |
224 | "malware acl condition: f-protd: unable to send command to socket (%s)", scanrequest); | |
225 | return DEFER; | |
226 | } | |
227 | ||
228 | /* We get a lot of empty lines, so we need this hack to check for any data at all */ | |
229 | while( recv(sock, buf, 1, MSG_PEEK) > 0 ) { | |
230 | if ( recv_line(sock, buf, 32768) > 0) { | |
231 | if ( Ustrstr(buf, US"<detected type=\"") != NULL ) { | |
232 | detected = 1; | |
233 | } else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) { | |
5ca6d115 | 234 | if (strhelper2 = (Ustrstr(buf, US"</name>"))) { |
e5496194 TK |
235 | *strhelper2 = '\0'; |
236 | Ustrcpy(malware_name_buffer, strhelper + 6); | |
237 | } | |
238 | } else if ( Ustrstr(buf, US"<summary code=\"") ) { | |
239 | if ( Ustrstr(buf, US"<summary code=\"11\">") ) { | |
240 | malware_name = malware_name_buffer; | |
241 | } else { | |
242 | malware_name = NULL; | |
243 | } | |
244 | } | |
245 | } | |
246 | } | |
247 | (void)close(sock); | |
248 | } | |
384152a6 TK |
249 | /* "drweb" scanner type ----------------------------------------------- */ |
250 | /* v0.1 - added support for tcp sockets */ | |
251 | /* v0.0 - initial release -- support for unix sockets */ | |
e5496194 | 252 | else if (strcmpic(scanner_name,US"drweb") == 0) { |
384152a6 TK |
253 | uschar *drweb_options; |
254 | uschar drweb_options_buffer[1024]; | |
255 | uschar drweb_options_default[] = "/usr/local/drweb/run/drwebd.sock"; | |
256 | struct sockaddr_un server; | |
257 | int sock, result, ovector[30]; | |
258 | unsigned int port, fsize; | |
259 | uschar tmpbuf[1024], *drweb_fbuf; | |
260 | uschar scanrequest[1024]; | |
261 | uschar drweb_match_string[128]; | |
262 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
263 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
264 | unsigned long bread; | |
265 | uschar hostname[256]; | |
266 | struct hostent *he; | |
267 | struct in_addr in; | |
268 | pcre *drweb_re; | |
269 | ||
270 | if ((drweb_options = string_nextinlist(&av_scanner_work, &sep, | |
271 | drweb_options_buffer, sizeof(drweb_options_buffer))) == NULL) { | |
272 | /* no options supplied, use default options */ | |
273 | drweb_options = drweb_options_default; | |
274 | }; | |
275 | ||
276 | if (*drweb_options != '/') { | |
277 | ||
278 | /* extract host and port part */ | |
279 | if( sscanf(CS drweb_options, "%s %u", hostname, &port) != 2 ) { | |
280 | log_write(0, LOG_MAIN|LOG_PANIC, | |
281 | "malware acl condition: drweb: invalid socket '%s'", drweb_options); | |
282 | return DEFER; | |
283 | } | |
284 | ||
285 | /* Lookup the host */ | |
286 | if((he = gethostbyname(CS hostname)) == 0) { | |
287 | log_write(0, LOG_MAIN|LOG_PANIC, | |
288 | "malware acl condition: drweb: failed to lookup host '%s'", hostname); | |
289 | return DEFER; | |
290 | } | |
291 | ||
292 | in = *(struct in_addr *) he->h_addr_list[0]; | |
293 | ||
294 | /* Open the drwebd TCP socket */ | |
295 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
296 | log_write(0, LOG_MAIN|LOG_PANIC, | |
297 | "malware acl condition: drweb: unable to acquire socket (%s)", | |
298 | strerror(errno)); | |
299 | return DEFER; | |
300 | } | |
301 | ||
302 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { | |
f1e894f3 | 303 | (void)close(sock); |
384152a6 TK |
304 | log_write(0, LOG_MAIN|LOG_PANIC, |
305 | "malware acl condition: drweb: connection to %s, port %u failed (%s)", | |
306 | inet_ntoa(in), port, strerror(errno)); | |
307 | return DEFER; | |
308 | } | |
309 | ||
310 | /* prepare variables */ | |
311 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
312 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
b07e6aa3 | 313 | (void)string_format(scanrequest, 1024,CS"%s/scan/%s/%s.eml", |
384152a6 TK |
314 | spool_directory, message_id, message_id); |
315 | ||
316 | /* calc file size */ | |
317 | drweb_fd = open(CS scanrequest, O_RDONLY); | |
318 | if (drweb_fd == -1) { | |
f1e894f3 | 319 | (void)close(sock); |
384152a6 TK |
320 | log_write(0, LOG_MAIN|LOG_PANIC, |
321 | "malware acl condition: drweb: can't open spool file %s: %s", | |
322 | scanrequest, strerror(errno)); | |
323 | return DEFER; | |
324 | } | |
325 | fsize = lseek(drweb_fd, 0, SEEK_END); | |
326 | if (fsize == -1) { | |
f1e894f3 PH |
327 | (void)close(sock); |
328 | (void)close(drweb_fd); | |
384152a6 TK |
329 | log_write(0, LOG_MAIN|LOG_PANIC, |
330 | "malware acl condition: drweb: can't seek spool file %s: %s", | |
331 | scanrequest, strerror(errno)); | |
332 | return DEFER; | |
333 | } | |
334 | drweb_slen = htonl(fsize); | |
335 | lseek(drweb_fd, 0, SEEK_SET); | |
336 | ||
337 | /* send scan request */ | |
338 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
339 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
340 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
341 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) { | |
f1e894f3 PH |
342 | (void)close(sock); |
343 | (void)close(drweb_fd); | |
384152a6 TK |
344 | log_write(0, LOG_MAIN|LOG_PANIC, |
345 | "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options); | |
346 | return DEFER; | |
347 | } | |
348 | ||
349 | drweb_fbuf = (uschar *) malloc (fsize); | |
350 | if (!drweb_fbuf) { | |
f1e894f3 PH |
351 | (void)close(sock); |
352 | (void)close(drweb_fd); | |
384152a6 TK |
353 | log_write(0, LOG_MAIN|LOG_PANIC, |
354 | "malware acl condition: drweb: unable to allocate memory %u for file (%s)", | |
355 | fsize, scanrequest); | |
356 | return DEFER; | |
357 | } | |
358 | ||
359 | result = read (drweb_fd, drweb_fbuf, fsize); | |
360 | if (result == -1) { | |
f1e894f3 PH |
361 | (void)close(sock); |
362 | (void)close(drweb_fd); | |
384152a6 TK |
363 | free(drweb_fbuf); |
364 | log_write(0, LOG_MAIN|LOG_PANIC, | |
365 | "malware acl condition: drweb: can't read spool file %s: %s", | |
366 | scanrequest, strerror(errno)); | |
367 | return DEFER; | |
368 | } | |
f1e894f3 | 369 | (void)close(drweb_fd); |
384152a6 TK |
370 | |
371 | /* send file body to socket */ | |
372 | if (send(sock, drweb_fbuf, fsize, 0) < 0) { | |
f1e894f3 | 373 | (void)close(sock); |
384152a6 TK |
374 | free(drweb_fbuf); |
375 | log_write(0, LOG_MAIN|LOG_PANIC, | |
376 | "malware acl condition: drweb: unable to send file body to socket (%s)", drweb_options); | |
377 | return DEFER; | |
378 | } | |
f1e894f3 | 379 | (void)close(drweb_fd); |
384152a6 TK |
380 | } |
381 | else { | |
382 | /* open the drwebd UNIX socket */ | |
383 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
384 | if (sock < 0) { | |
385 | log_write(0, LOG_MAIN|LOG_PANIC, | |
386 | "malware acl condition: drweb: can't open UNIX socket"); | |
387 | return DEFER; | |
388 | } | |
389 | server.sun_family = AF_UNIX; | |
390 | Ustrcpy(server.sun_path, drweb_options); | |
391 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 392 | (void)close(sock); |
384152a6 TK |
393 | log_write(0, LOG_MAIN|LOG_PANIC, |
394 | "malware acl condition: drweb: unable to connect to socket (%s). errno=%d", drweb_options, errno); | |
395 | return DEFER; | |
396 | } | |
397 | ||
398 | /* prepare variables */ | |
399 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
400 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
b07e6aa3 | 401 | (void)string_format(scanrequest, 1024,CS"%s/scan/%s/%s.eml", spool_directory, message_id, message_id); |
384152a6 TK |
402 | drweb_slen = htonl(Ustrlen(scanrequest)); |
403 | ||
404 | /* send scan request */ | |
405 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
406 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
407 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
408 | (send(sock, scanrequest, Ustrlen(scanrequest), 0) < 0) || | |
409 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) { | |
f1e894f3 | 410 | (void)close(sock); |
384152a6 TK |
411 | log_write(0, LOG_MAIN|LOG_PANIC, |
412 | "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options); | |
413 | return DEFER; | |
414 | } | |
415 | } | |
416 | ||
417 | /* wait for result */ | |
418 | if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) { | |
f1e894f3 | 419 | (void)close(sock); |
384152a6 TK |
420 | log_write(0, LOG_MAIN|LOG_PANIC, |
421 | "malware acl condition: drweb: unable to read return code"); | |
422 | return DEFER; | |
423 | } | |
424 | drweb_rc = ntohl(drweb_rc); | |
425 | ||
426 | if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) { | |
f1e894f3 | 427 | (void)close(sock); |
384152a6 TK |
428 | log_write(0, LOG_MAIN|LOG_PANIC, |
429 | "malware acl condition: drweb: unable to read the number of viruses"); | |
430 | return DEFER; | |
431 | } | |
432 | drweb_vnum = ntohl(drweb_vnum); | |
433 | ||
434 | /* "virus(es) found" if virus number is > 0 */ | |
435 | if (drweb_vnum) | |
436 | { | |
437 | int i; | |
438 | uschar pre_malware_nb[256]; | |
439 | ||
440 | malware_name = malware_name_buffer; | |
441 | ||
442 | /* setup default virus name */ | |
443 | Ustrcpy(malware_name_buffer,"unknown"); | |
444 | ||
445 | /* read and concatenate virus names into one string */ | |
446 | for (i=0;i<drweb_vnum;i++) | |
447 | { | |
448 | /* read the size of report */ | |
449 | if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) { | |
f1e894f3 | 450 | (void)close(sock); |
384152a6 TK |
451 | log_write(0, LOG_MAIN|LOG_PANIC, |
452 | "malware acl condition: drweb: cannot read report size"); | |
453 | return DEFER; | |
454 | }; | |
455 | drweb_slen = ntohl(drweb_slen); | |
456 | ||
457 | /* read report body */ | |
458 | if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) { | |
f1e894f3 | 459 | (void)close(sock); |
384152a6 TK |
460 | log_write(0, LOG_MAIN|LOG_PANIC, |
461 | "malware acl condition: drweb: cannot read report string"); | |
462 | return DEFER; | |
463 | }; | |
464 | tmpbuf[drweb_slen] = '\0'; | |
465 | ||
466 | /* set up match regex, depends on retcode */ | |
467 | Ustrcpy(drweb_match_string, "infected\\swith\\s*(.+?)$"); | |
468 | ||
469 | drweb_re = pcre_compile( CS drweb_match_string, | |
470 | PCRE_COPT, | |
471 | (const char **)&rerror, | |
472 | &roffset, | |
473 | NULL ); | |
474 | ||
475 | /* try matcher on the line, grab substring */ | |
476 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
477 | if (result >= 2) { | |
478 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS pre_malware_nb, 255); | |
479 | } | |
480 | /* the first name we just copy to malware_name */ | |
481 | if (i==0) | |
482 | Ustrcpy(CS malware_name_buffer, CS pre_malware_nb); | |
483 | else { | |
484 | /* concatenate each new virus name to previous */ | |
485 | int slen = Ustrlen(malware_name_buffer); | |
486 | if (slen < (slen+Ustrlen(pre_malware_nb))) { | |
487 | Ustrcat(malware_name_buffer, "/"); | |
488 | Ustrcat(malware_name_buffer, pre_malware_nb); | |
489 | } | |
490 | } | |
491 | } | |
492 | } | |
493 | else { | |
494 | char *drweb_s = NULL; | |
495 | ||
496 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
497 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
498 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
499 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
500 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
501 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
502 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
503 | * and others are ignored */ | |
504 | if (drweb_s) { | |
505 | log_write(0, LOG_MAIN|LOG_PANIC, | |
506 | "malware acl condition: drweb: drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s); | |
f1e894f3 | 507 | (void)close(sock); |
384152a6 TK |
508 | return DEFER; |
509 | } | |
510 | /* no virus found */ | |
511 | malware_name = NULL; | |
512 | }; | |
f1e894f3 | 513 | (void)close(sock); |
384152a6 TK |
514 | } |
515 | /* ----------------------------------------------------------------------- */ | |
8523533c TK |
516 | else if (strcmpic(scanner_name,US"aveserver") == 0) { |
517 | uschar *kav_options; | |
518 | uschar kav_options_buffer[1024]; | |
519 | uschar kav_options_default[] = "/var/run/aveserver"; | |
520 | uschar buf[32768]; | |
8523533c TK |
521 | struct sockaddr_un server; |
522 | int sock; | |
7e274b4b | 523 | int result; |
8e669ac1 | 524 | |
8523533c TK |
525 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
526 | kav_options_buffer, | |
527 | sizeof(kav_options_buffer))) == NULL) { | |
528 | /* no options supplied, use default options */ | |
529 | kav_options = kav_options_default; | |
530 | }; | |
8e669ac1 | 531 | |
8523533c TK |
532 | /* open the aveserver socket */ |
533 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
534 | if (sock < 0) { | |
535 | log_write(0, LOG_MAIN|LOG_PANIC, | |
536 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 537 | return DEFER; |
8523533c TK |
538 | } |
539 | server.sun_family = AF_UNIX; | |
540 | Ustrcpy(server.sun_path, kav_options); | |
541 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 542 | (void)close(sock); |
8523533c TK |
543 | log_write(0, LOG_MAIN|LOG_PANIC, |
544 | "malware acl condition: unable to connect to aveserver UNIX socket (%s). errno=%d", kav_options, errno); | |
545 | return DEFER; | |
546 | } | |
8e669ac1 | 547 | |
8523533c TK |
548 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
549 | recv_line(sock, buf, 32768); | |
550 | ||
551 | if (buf[0] != '2') { | |
552 | /* aveserver is having problems */ | |
f1e894f3 | 553 | (void)close(sock); |
8523533c TK |
554 | log_write(0, LOG_MAIN|LOG_PANIC, |
555 | "malware acl condition: aveserver is unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
556 | return DEFER; | |
557 | }; | |
8e669ac1 | 558 | |
8523533c | 559 | /* prepare our command */ |
b07e6aa3 | 560 | (void)string_format(buf, 32768, "SCAN bPQRSTUW %s/scan/%s/%s.eml\r\n", spool_directory, message_id, message_id); |
8e669ac1 | 561 | |
8523533c TK |
562 | /* and send it */ |
563 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 564 | (void)close(sock); |
8523533c TK |
565 | log_write(0, LOG_MAIN|LOG_PANIC, |
566 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
567 | return DEFER; | |
568 | } | |
8e669ac1 | 569 | |
8523533c | 570 | malware_name = NULL; |
7e274b4b | 571 | result = 0; |
8523533c TK |
572 | /* read response lines, find malware name and final response */ |
573 | while (recv_line(sock, buf, 32768) > 0) { | |
574 | debug_printf("aveserver: %s\n", buf); | |
7e274b4b TK |
575 | if (buf[0] == '2') { |
576 | break; | |
577 | } else if (buf[0] == '5') { | |
578 | /* aveserver is having problems */ | |
579 | log_write(0, LOG_MAIN|LOG_PANIC, | |
580 | "malware acl condition: unable to scan file %s/scan/%s/%s.eml (Responded: %s).", | |
581 | spool_directory, message_id, message_id, buf); | |
582 | result = DEFER; | |
583 | break; | |
584 | } else if (Ustrncmp(buf,"322",3) == 0) { | |
8523533c TK |
585 | uschar *p = Ustrchr(&buf[4],' '); |
586 | *p = '\0'; | |
587 | Ustrcpy(malware_name_buffer,&buf[4]); | |
588 | malware_name = malware_name_buffer; | |
7e274b4b TK |
589 | }; |
590 | } | |
591 | ||
592 | /* prepare our command */ | |
b07e6aa3 | 593 | (void)string_format(buf, 32768, "quit\r\n"); |
7e274b4b TK |
594 | |
595 | /* and send it */ | |
596 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 597 | (void)close(sock); |
7e274b4b TK |
598 | log_write(0, LOG_MAIN|LOG_PANIC, |
599 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
600 | return DEFER; | |
8523533c TK |
601 | } |
602 | ||
7e274b4b TK |
603 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
604 | recv_line(sock, buf, 32768); | |
605 | ||
606 | if (buf[0] != '2') { | |
607 | /* aveserver is having problems */ | |
f1e894f3 | 608 | (void)close(sock); |
7e274b4b TK |
609 | log_write(0, LOG_MAIN|LOG_PANIC, |
610 | "malware acl condition: unable to quit aveserver dialogue (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
611 | return DEFER; | |
612 | }; | |
613 | ||
f1e894f3 | 614 | (void)close(sock); |
7e274b4b TK |
615 | |
616 | if (result == DEFER) return DEFER; | |
8523533c TK |
617 | } |
618 | /* "fsecure" scanner type ------------------------------------------------- */ | |
619 | else if (strcmpic(scanner_name,US"fsecure") == 0) { | |
620 | uschar *fsecure_options; | |
621 | uschar fsecure_options_buffer[1024]; | |
622 | uschar fsecure_options_default[] = "/var/run/.fsav"; | |
623 | struct sockaddr_un server; | |
624 | int sock, i, j, bread = 0; | |
625 | uschar file_name[1024]; | |
626 | uschar av_buffer[1024]; | |
627 | pcre *fs_inf; | |
f7b63901 PH |
628 | static uschar *cmdoptions[] = { US"CONFIGURE\tARCHIVE\t1\n", |
629 | US"CONFIGURE\tTIMEOUT\t0\n", | |
630 | US"CONFIGURE\tMAXARCH\t5\n", | |
631 | US"CONFIGURE\tMIME\t1\n" }; | |
8e669ac1 | 632 | |
8523533c TK |
633 | malware_name = NULL; |
634 | if ((fsecure_options = string_nextinlist(&av_scanner_work, &sep, | |
635 | fsecure_options_buffer, | |
8e669ac1 | 636 | sizeof(fsecure_options_buffer))) == NULL) { |
8523533c TK |
637 | /* no options supplied, use default options */ |
638 | fsecure_options = fsecure_options_default; | |
639 | }; | |
8e669ac1 | 640 | |
8523533c TK |
641 | /* open the fsecure socket */ |
642 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
643 | if (sock < 0) { | |
644 | log_write(0, LOG_MAIN|LOG_PANIC, | |
645 | "malware acl condition: unable to open fsecure socket %s (%s)", | |
646 | fsecure_options, strerror(errno)); | |
647 | return DEFER; | |
648 | } | |
649 | server.sun_family = AF_UNIX; | |
650 | Ustrcpy(server.sun_path, fsecure_options); | |
651 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 652 | (void)close(sock); |
8523533c TK |
653 | log_write(0, LOG_MAIN|LOG_PANIC, |
654 | "malware acl condition: unable to connect to fsecure socket %s (%s)", | |
655 | fsecure_options, strerror(errno)); | |
656 | return DEFER; | |
657 | } | |
8e669ac1 | 658 | |
8523533c TK |
659 | /* pass options */ |
660 | memset(av_buffer, 0, sizeof(av_buffer)); | |
661 | for (i=0; i != 4; i++) { | |
662 | /* debug_printf("send option \"%s\"",cmdoptions[i]); */ | |
663 | if (write(sock, cmdoptions[i], Ustrlen(cmdoptions[i])) < 0) { | |
f1e894f3 | 664 | (void)close(sock); |
8523533c TK |
665 | log_write(0, LOG_MAIN|LOG_PANIC, |
666 | "malware acl condition: unable to write fsecure option %d to %s (%s)", | |
667 | i, fsecure_options, strerror(errno)); | |
8e669ac1 | 668 | return DEFER; |
8523533c | 669 | }; |
8e669ac1 | 670 | |
a9ccd69a | 671 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
8523533c TK |
672 | if (bread >0) av_buffer[bread]='\0'; |
673 | if (bread < 0) { | |
f1e894f3 | 674 | (void)close(sock); |
8523533c TK |
675 | log_write(0, LOG_MAIN|LOG_PANIC, |
676 | "malware acl condition: unable to read fsecure answer %d (%s)", i, strerror(errno)); | |
677 | return DEFER; | |
678 | }; | |
679 | for (j=0;j<bread;j++) if((av_buffer[j]=='\r')||(av_buffer[j]=='\n')) av_buffer[j] ='@'; | |
680 | /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */ | |
681 | /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */ | |
682 | }; | |
8e669ac1 | 683 | |
8523533c | 684 | /* pass the mailfile to fsecure */ |
b07e6aa3 | 685 | (void)string_format(file_name,1024,"SCAN\t%s/scan/%s/%s.eml\n", spool_directory, message_id, message_id); |
8523533c TK |
686 | /* debug_printf("send scan %s",file_name); */ |
687 | if (write(sock, file_name, Ustrlen(file_name)) < 0) { | |
f1e894f3 | 688 | (void)close(sock); |
8523533c TK |
689 | log_write(0, LOG_MAIN|LOG_PANIC, |
690 | "malware acl condition: unable to write fsecure scan to %s (%s)", | |
691 | fsecure_options, strerror(errno)); | |
692 | return DEFER; | |
693 | }; | |
8e669ac1 | 694 | |
8523533c TK |
695 | /* set up match */ |
696 | /* todo also SUSPICION\t */ | |
697 | fs_inf = pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
8e669ac1 | 698 | |
8523533c TK |
699 | /* read report, linewise */ |
700 | do { | |
701 | int ovector[30]; | |
702 | i = 0; | |
703 | memset(av_buffer, 0, sizeof(av_buffer)); | |
704 | do { | |
a9ccd69a | 705 | bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT); |
8523533c | 706 | if (bread < 0) { |
f1e894f3 | 707 | (void)close(sock); |
8523533c TK |
708 | log_write(0, LOG_MAIN|LOG_PANIC, |
709 | "malware acl condition: unable to read fsecure result (%s)", strerror(errno)); | |
710 | return DEFER; | |
711 | }; | |
712 | i++; | |
713 | } | |
714 | while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n')); | |
715 | av_buffer[i-1] = '\0'; | |
716 | /* debug_printf("got line \"%s\"\n",av_buffer); */ | |
8e669ac1 | 717 | |
8523533c TK |
718 | /* Really search for virus again? */ |
719 | if (malware_name == NULL) { | |
720 | /* try matcher on the line, grab substring */ | |
721 | i = pcre_exec(fs_inf, NULL, CS av_buffer, Ustrlen(av_buffer), 0, 0, ovector, 30); | |
722 | if (i >= 2) { | |
723 | /* Got it */ | |
724 | pcre_copy_substring(CS av_buffer, ovector, i, 1, CS malware_name_buffer, 255); | |
725 | malware_name = malware_name_buffer; | |
726 | }; | |
727 | }; | |
728 | } | |
729 | while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL); | |
f1e894f3 | 730 | (void)close(sock); |
8523533c TK |
731 | } |
732 | /* ----------------------------------------------------------------------- */ | |
733 | ||
734 | /* "kavdaemon" scanner type ------------------------------------------------ */ | |
735 | else if (strcmpic(scanner_name,US"kavdaemon") == 0) { | |
736 | uschar *kav_options; | |
737 | uschar kav_options_buffer[1024]; | |
738 | uschar kav_options_default[] = "/var/run/AvpCtl"; | |
739 | struct sockaddr_un server; | |
740 | int sock; | |
741 | time_t t; | |
742 | uschar tmpbuf[1024]; | |
743 | uschar scanrequest[1024]; | |
744 | uschar kav_match_string[128]; | |
745 | int kav_rc; | |
746 | unsigned long kav_reportlen, bread; | |
747 | pcre *kav_re; | |
8e669ac1 | 748 | |
8523533c TK |
749 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
750 | kav_options_buffer, | |
751 | sizeof(kav_options_buffer))) == NULL) { | |
752 | /* no options supplied, use default options */ | |
753 | kav_options = kav_options_default; | |
754 | }; | |
8e669ac1 | 755 | |
8523533c TK |
756 | /* open the kavdaemon socket */ |
757 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
758 | if (sock < 0) { | |
759 | log_write(0, LOG_MAIN|LOG_PANIC, | |
760 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 761 | return DEFER; |
8523533c TK |
762 | } |
763 | server.sun_family = AF_UNIX; | |
764 | Ustrcpy(server.sun_path, kav_options); | |
765 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 766 | (void)close(sock); |
8523533c TK |
767 | log_write(0, LOG_MAIN|LOG_PANIC, |
768 | "malware acl condition: unable to connect to kavdaemon UNIX socket (%s). errno=%d", kav_options, errno); | |
769 | return DEFER; | |
770 | } | |
8e669ac1 | 771 | |
8523533c TK |
772 | /* get current date and time, build scan request */ |
773 | time(&t); | |
774 | strftime(CS tmpbuf, sizeof(tmpbuf), "<0>%d %b %H:%M:%S:%%s/scan/%%s", localtime(&t)); | |
b07e6aa3 | 775 | (void)string_format(scanrequest, 1024,CS tmpbuf, spool_directory, message_id); |
8e669ac1 | 776 | |
8523533c TK |
777 | /* send scan request */ |
778 | if (send(sock, scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
f1e894f3 | 779 | (void)close(sock); |
8523533c TK |
780 | log_write(0, LOG_MAIN|LOG_PANIC, |
781 | "malware acl condition: unable to write to kavdaemon UNIX socket (%s)", kav_options); | |
782 | return DEFER; | |
783 | } | |
8e669ac1 | 784 | |
8523533c TK |
785 | /* wait for result */ |
786 | if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) { | |
f1e894f3 | 787 | (void)close(sock); |
8523533c TK |
788 | log_write(0, LOG_MAIN|LOG_PANIC, |
789 | "malware acl condition: unable to read 2 bytes from kavdaemon socket."); | |
790 | return DEFER; | |
791 | } | |
8e669ac1 | 792 | |
8523533c TK |
793 | /* get errorcode from one nibble */ |
794 | if (test_byte_order() == LITTLE_MY_ENDIAN) { | |
795 | kav_rc = tmpbuf[0] & 0x0F; | |
796 | } | |
797 | else { | |
798 | kav_rc = tmpbuf[1] & 0x0F; | |
799 | }; | |
8e669ac1 | 800 | |
8523533c TK |
801 | /* improper kavdaemon configuration */ |
802 | if ( (kav_rc == 5) || (kav_rc == 6) ) { | |
f1e894f3 | 803 | (void)close(sock); |
8523533c TK |
804 | log_write(0, LOG_MAIN|LOG_PANIC, |
805 | "malware acl condition: please reconfigure kavdaemon to NOT disinfect or remove infected files."); | |
806 | return DEFER; | |
807 | }; | |
8e669ac1 | 808 | |
8523533c | 809 | if (kav_rc == 1) { |
f1e894f3 | 810 | (void)close(sock); |
8523533c TK |
811 | log_write(0, LOG_MAIN|LOG_PANIC, |
812 | "malware acl condition: kavdaemon reported 'scanning not completed' (code 1)."); | |
813 | return DEFER; | |
814 | }; | |
8e669ac1 | 815 | |
8523533c | 816 | if (kav_rc == 7) { |
f1e894f3 | 817 | (void)close(sock); |
8523533c TK |
818 | log_write(0, LOG_MAIN|LOG_PANIC, |
819 | "malware acl condition: kavdaemon reported 'kavdaemon damaged' (code 7)."); | |
820 | return DEFER; | |
821 | }; | |
8e669ac1 | 822 | |
8523533c TK |
823 | /* code 8 is not handled, since it is ambigous. It appears mostly on |
824 | bounces where part of a file has been cut off */ | |
8e669ac1 | 825 | |
8523533c TK |
826 | /* "virus found" return codes (2-4) */ |
827 | if ((kav_rc > 1) && (kav_rc < 5)) { | |
828 | int report_flag = 0; | |
8e669ac1 | 829 | |
8523533c TK |
830 | /* setup default virus name */ |
831 | Ustrcpy(malware_name_buffer,"unknown"); | |
832 | malware_name = malware_name_buffer; | |
8e669ac1 | 833 | |
8523533c TK |
834 | if (test_byte_order() == LITTLE_MY_ENDIAN) { |
835 | report_flag = tmpbuf[1]; | |
836 | } | |
837 | else { | |
838 | report_flag = tmpbuf[0]; | |
839 | }; | |
8e669ac1 | 840 | |
8523533c TK |
841 | /* read the report, if available */ |
842 | if( report_flag == 1 ) { | |
843 | /* read report size */ | |
844 | if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) { | |
f1e894f3 | 845 | (void)close(sock); |
8523533c TK |
846 | log_write(0, LOG_MAIN|LOG_PANIC, |
847 | "malware acl condition: cannot read report size from kavdaemon"); | |
848 | return DEFER; | |
849 | }; | |
8e669ac1 | 850 | |
8523533c TK |
851 | /* it's possible that avp returns av_buffer[1] == 1 but the |
852 | reportsize is 0 (!?) */ | |
853 | if (kav_reportlen > 0) { | |
854 | /* set up match regex, depends on retcode */ | |
855 | if( kav_rc == 3 ) | |
856 | Ustrcpy(kav_match_string, "suspicion:\\s*(.+?)\\s*$"); | |
857 | else | |
858 | Ustrcpy(kav_match_string, "infected:\\s*(.+?)\\s*$"); | |
8e669ac1 | 859 | |
8523533c TK |
860 | kav_re = pcre_compile( CS kav_match_string, |
861 | PCRE_COPT, | |
862 | (const char **)&rerror, | |
863 | &roffset, | |
864 | NULL ); | |
8e669ac1 PH |
865 | |
866 | /* read report, linewise */ | |
8523533c TK |
867 | while (kav_reportlen > 0) { |
868 | int result = 0; | |
869 | int ovector[30]; | |
8e669ac1 | 870 | |
8523533c TK |
871 | bread = 0; |
872 | while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) { | |
873 | kav_reportlen--; | |
874 | if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break; | |
875 | bread++; | |
876 | }; | |
877 | bread++; | |
878 | tmpbuf[bread] = '\0'; | |
8e669ac1 | 879 | |
8523533c TK |
880 | /* try matcher on the line, grab substring */ |
881 | result = pcre_exec(kav_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
882 | if (result >= 2) { | |
883 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS malware_name_buffer, 255); | |
884 | break; | |
885 | }; | |
886 | }; | |
887 | }; | |
888 | }; | |
889 | } | |
890 | else { | |
891 | /* no virus found */ | |
892 | malware_name = NULL; | |
893 | }; | |
8e669ac1 | 894 | |
f1e894f3 | 895 | (void)close(sock); |
8523533c TK |
896 | } |
897 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
898 | |
899 | ||
8523533c TK |
900 | /* "cmdline" scanner type ------------------------------------------------ */ |
901 | else if (strcmpic(scanner_name,US"cmdline") == 0) { | |
902 | uschar *cmdline_scanner; | |
903 | uschar cmdline_scanner_buffer[1024]; | |
904 | uschar *cmdline_trigger; | |
905 | uschar cmdline_trigger_buffer[1024]; | |
906 | const pcre *cmdline_trigger_re; | |
907 | uschar *cmdline_regex; | |
908 | uschar cmdline_regex_buffer[1024]; | |
909 | const pcre *cmdline_regex_re; | |
910 | uschar file_name[1024]; | |
911 | uschar commandline[1024]; | |
912 | void (*eximsigchld)(int); | |
913 | void (*eximsigpipe)(int); | |
914 | FILE *scanner_out = NULL; | |
915 | FILE *scanner_record = NULL; | |
916 | uschar linebuffer[32767]; | |
917 | int trigger = 0; | |
918 | int result; | |
919 | int ovector[30]; | |
8e669ac1 | 920 | |
8523533c TK |
921 | /* find scanner command line */ |
922 | if ((cmdline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
923 | cmdline_scanner_buffer, | |
924 | sizeof(cmdline_scanner_buffer))) == NULL) { | |
925 | /* no command line supplied */ | |
926 | log_write(0, LOG_MAIN|LOG_PANIC, | |
927 | "malware acl condition: missing commandline specification for cmdline scanner type."); | |
8e669ac1 | 928 | return DEFER; |
8523533c | 929 | }; |
8e669ac1 | 930 | |
8523533c TK |
931 | /* find scanner output trigger */ |
932 | if ((cmdline_trigger = string_nextinlist(&av_scanner_work, &sep, | |
933 | cmdline_trigger_buffer, | |
934 | sizeof(cmdline_trigger_buffer))) == NULL) { | |
935 | /* no trigger regex supplied */ | |
936 | log_write(0, LOG_MAIN|LOG_PANIC, | |
937 | "malware acl condition: missing trigger specification for cmdline scanner type."); | |
8e669ac1 | 938 | return DEFER; |
8523533c | 939 | }; |
8e669ac1 | 940 | |
8523533c TK |
941 | /* precompile trigger regex */ |
942 | cmdline_trigger_re = pcre_compile(CS cmdline_trigger, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
943 | if (cmdline_trigger_re == NULL) { | |
944 | log_write(0, LOG_MAIN|LOG_PANIC, | |
945 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_trigger_re, rerror, roffset); | |
946 | return DEFER; | |
947 | }; | |
8e669ac1 | 948 | |
8523533c TK |
949 | /* find scanner name regex */ |
950 | if ((cmdline_regex = string_nextinlist(&av_scanner_work, &sep, | |
951 | cmdline_regex_buffer, | |
952 | sizeof(cmdline_regex_buffer))) == NULL) { | |
953 | /* no name regex supplied */ | |
954 | log_write(0, LOG_MAIN|LOG_PANIC, | |
955 | "malware acl condition: missing virus name regex specification for cmdline scanner type."); | |
8e669ac1 | 956 | return DEFER; |
8523533c | 957 | }; |
8e669ac1 | 958 | |
8523533c TK |
959 | /* precompile name regex */ |
960 | cmdline_regex_re = pcre_compile(CS cmdline_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
961 | if (cmdline_regex_re == NULL) { | |
962 | log_write(0, LOG_MAIN|LOG_PANIC, | |
963 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_regex_re, rerror, roffset); | |
964 | return DEFER; | |
965 | }; | |
8e669ac1 | 966 | |
8523533c | 967 | /* prepare scanner call */ |
b07e6aa3 PH |
968 | (void)string_format(file_name,1024,"%s/scan/%s", spool_directory, message_id); |
969 | (void)string_format(commandline,1024, CS cmdline_scanner,file_name); | |
8523533c TK |
970 | /* redirect STDERR too */ |
971 | Ustrcat(commandline," 2>&1"); | |
8e669ac1 | 972 | |
8523533c TK |
973 | /* store exims signal handlers */ |
974 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
975 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
8e669ac1 | 976 | |
8523533c TK |
977 | scanner_out = popen(CS commandline,"r"); |
978 | if (scanner_out == NULL) { | |
979 | log_write(0, LOG_MAIN|LOG_PANIC, | |
980 | "malware acl condition: calling cmdline scanner (%s) failed: %s.", commandline, strerror(errno)); | |
981 | signal(SIGCHLD,eximsigchld); | |
982 | signal(SIGPIPE,eximsigpipe); | |
983 | return DEFER; | |
984 | }; | |
8e669ac1 | 985 | |
b07e6aa3 | 986 | (void)string_format(file_name,1024,"%s/scan/%s/%s_scanner_output", spool_directory, message_id, message_id); |
2632889e | 987 | scanner_record = modefopen(file_name,"wb",SPOOL_MODE); |
8e669ac1 | 988 | |
8523533c TK |
989 | if (scanner_record == NULL) { |
990 | log_write(0, LOG_MAIN|LOG_PANIC, | |
991 | "malware acl condition: opening scanner output file (%s) failed: %s.", file_name, strerror(errno)); | |
992 | pclose(scanner_out); | |
993 | signal(SIGCHLD,eximsigchld); | |
994 | signal(SIGPIPE,eximsigpipe); | |
995 | return DEFER; | |
996 | }; | |
8e669ac1 | 997 | |
8523533c TK |
998 | /* look for trigger while recording output */ |
999 | while(fgets(CS linebuffer,32767,scanner_out) != NULL) { | |
1000 | if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) { | |
1001 | /* short write */ | |
1002 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1003 | "malware acl condition: short write on scanner output file (%s).", file_name); | |
1004 | pclose(scanner_out); | |
1005 | signal(SIGCHLD,eximsigchld); | |
1006 | signal(SIGPIPE,eximsigpipe); | |
1007 | return DEFER; | |
1008 | }; | |
1009 | /* try trigger match */ | |
1010 | if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1)) | |
1011 | trigger = 1; | |
1012 | }; | |
8e669ac1 | 1013 | |
f1e894f3 | 1014 | (void)fclose(scanner_record); |
8523533c TK |
1015 | pclose(scanner_out); |
1016 | signal(SIGCHLD,eximsigchld); | |
1017 | signal(SIGPIPE,eximsigpipe); | |
8e669ac1 | 1018 | |
8523533c TK |
1019 | if (trigger) { |
1020 | /* setup default virus name */ | |
1021 | Ustrcpy(malware_name_buffer,"unknown"); | |
1022 | malware_name = malware_name_buffer; | |
8e669ac1 | 1023 | |
8523533c | 1024 | /* re-open the scanner output file, look for name match */ |
c58b88df | 1025 | scanner_record = fopen(CS file_name,"rb"); |
8523533c TK |
1026 | while(fgets(CS linebuffer,32767,scanner_record) != NULL) { |
1027 | /* try match */ | |
1028 | result = pcre_exec(cmdline_regex_re, NULL, CS linebuffer, Ustrlen(linebuffer), 0, 0, ovector, 30); | |
1029 | if (result >= 2) { | |
1030 | pcre_copy_substring(CS linebuffer, ovector, result, 1, CS malware_name_buffer, 255); | |
1031 | }; | |
1032 | }; | |
f1e894f3 | 1033 | (void)fclose(scanner_record); |
8523533c TK |
1034 | } |
1035 | else { | |
1036 | /* no virus found */ | |
1037 | malware_name = NULL; | |
1038 | }; | |
1039 | } | |
1040 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1041 | |
1042 | ||
8523533c TK |
1043 | /* "sophie" scanner type ------------------------------------------------- */ |
1044 | else if (strcmpic(scanner_name,US"sophie") == 0) { | |
1045 | uschar *sophie_options; | |
1046 | uschar sophie_options_buffer[1024]; | |
1047 | uschar sophie_options_default[] = "/var/run/sophie"; | |
1048 | int bread = 0; | |
1049 | struct sockaddr_un server; | |
1050 | int sock; | |
1051 | uschar file_name[1024]; | |
1052 | uschar av_buffer[1024]; | |
8e669ac1 | 1053 | |
8523533c TK |
1054 | if ((sophie_options = string_nextinlist(&av_scanner_work, &sep, |
1055 | sophie_options_buffer, | |
1056 | sizeof(sophie_options_buffer))) == NULL) { | |
1057 | /* no options supplied, use default options */ | |
1058 | sophie_options = sophie_options_default; | |
1059 | }; | |
8e669ac1 | 1060 | |
8523533c TK |
1061 | /* open the sophie socket */ |
1062 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1063 | if (sock < 0) { | |
1064 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1065 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1066 | return DEFER; |
8523533c TK |
1067 | } |
1068 | server.sun_family = AF_UNIX; | |
1069 | Ustrcpy(server.sun_path, sophie_options); | |
1070 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1071 | (void)close(sock); |
8523533c TK |
1072 | log_write(0, LOG_MAIN|LOG_PANIC, |
1073 | "malware acl condition: unable to connect to sophie UNIX socket (%s). errno=%d", sophie_options, errno); | |
1074 | return DEFER; | |
1075 | } | |
8e669ac1 | 1076 | |
8523533c | 1077 | /* pass the scan directory to sophie */ |
b07e6aa3 | 1078 | (void)string_format(file_name,1024,"%s/scan/%s", spool_directory, message_id); |
8523533c | 1079 | if (write(sock, file_name, Ustrlen(file_name)) < 0) { |
f1e894f3 | 1080 | (void)close(sock); |
8523533c TK |
1081 | log_write(0, LOG_MAIN|LOG_PANIC, |
1082 | "malware acl condition: unable to write to sophie UNIX socket (%s)", sophie_options); | |
8e669ac1 | 1083 | return DEFER; |
8523533c | 1084 | }; |
8e669ac1 | 1085 | |
f1e894f3 | 1086 | (void)write(sock, "\n", 1); |
8e669ac1 | 1087 | |
8523533c TK |
1088 | /* wait for result */ |
1089 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1090 | if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) { |
f1e894f3 | 1091 | (void)close(sock); |
8523533c TK |
1092 | log_write(0, LOG_MAIN|LOG_PANIC, |
1093 | "malware acl condition: unable to read from sophie UNIX socket (%s)", sophie_options); | |
1094 | return DEFER; | |
1095 | }; | |
8e669ac1 | 1096 | |
f1e894f3 | 1097 | (void)close(sock); |
8e669ac1 | 1098 | |
8523533c TK |
1099 | /* infected ? */ |
1100 | if (av_buffer[0] == '1') { | |
1101 | if (Ustrchr(av_buffer, '\n')) *Ustrchr(av_buffer, '\n') = '\0'; | |
1102 | Ustrcpy(malware_name_buffer,&av_buffer[2]); | |
1103 | malware_name = malware_name_buffer; | |
1104 | } | |
1105 | else if (!strncmp(CS av_buffer, "-1", 2)) { | |
1106 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1107 | "malware acl condition: malware acl condition: sophie reported error"); | |
1108 | return DEFER; | |
1109 | } | |
1110 | else { | |
1111 | /* all ok, no virus */ | |
1112 | malware_name = NULL; | |
1113 | }; | |
1114 | } | |
1115 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1116 | |
8523533c TK |
1117 | |
1118 | /* "clamd" scanner type ------------------------------------------------- */ | |
3d2a6e4d | 1119 | /* This code was contributed by David Saez */ |
8523533c TK |
1120 | else if (strcmpic(scanner_name,US"clamd") == 0) { |
1121 | uschar *clamd_options; | |
1122 | uschar clamd_options_buffer[1024]; | |
1123 | uschar clamd_options_default[] = "/tmp/clamd"; | |
1124 | uschar *p,*vname; | |
1125 | struct sockaddr_un server; | |
f7b63901 | 1126 | int sock,bread=0; |
8e669ac1 | 1127 | unsigned int port; |
8523533c TK |
1128 | uschar file_name[1024]; |
1129 | uschar av_buffer[1024]; | |
1130 | uschar hostname[256]; | |
1131 | struct hostent *he; | |
1132 | struct in_addr in; | |
2376f2f5 TK |
1133 | uschar *clamd_options2; |
1134 | uschar clamd_options2_buffer[1024]; | |
1135 | uschar clamd_options2_default[] = ""; | |
1136 | uschar av_buffer2[1024]; | |
1137 | uschar *clamav_fbuf; | |
1138 | uschar scanrequest[1024]; | |
1139 | int sockData, clam_fd, result; | |
1140 | unsigned int fsize; | |
8523533c TK |
1141 | |
1142 | if ((clamd_options = string_nextinlist(&av_scanner_work, &sep, | |
1143 | clamd_options_buffer, | |
1144 | sizeof(clamd_options_buffer))) == NULL) { | |
1145 | /* no options supplied, use default options */ | |
1146 | clamd_options = clamd_options_default; | |
1147 | } | |
2376f2f5 TK |
1148 | if ((clamd_options2 = string_nextinlist(&av_scanner_work, &sep, |
1149 | clamd_options2_buffer, | |
1150 | sizeof(clamd_options2_buffer))) == NULL) { | |
1151 | clamd_options2 = clamd_options2_default; | |
1152 | } | |
8e669ac1 | 1153 | |
8523533c TK |
1154 | /* socket does not start with '/' -> network socket */ |
1155 | if (*clamd_options != '/') { | |
8e669ac1 | 1156 | |
8523533c TK |
1157 | /* extract host and port part */ |
1158 | if( sscanf(CS clamd_options, "%s %u", hostname, &port) != 2 ) { | |
1159 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1160 | "malware acl condition: clamd: invalid socket '%s'", clamd_options); | |
1161 | return DEFER; | |
1162 | }; | |
8e669ac1 | 1163 | |
8523533c TK |
1164 | /* Lookup the host */ |
1165 | if((he = gethostbyname(CS hostname)) == 0) { | |
1166 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1167 | "malware acl condition: clamd: failed to lookup host '%s'", hostname); | |
1168 | return DEFER; | |
1169 | } | |
8e669ac1 | 1170 | |
8523533c | 1171 | in = *(struct in_addr *) he->h_addr_list[0]; |
8e669ac1 | 1172 | |
8523533c TK |
1173 | /* Open the ClamAV Socket */ |
1174 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
1175 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1176 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1177 | strerror(errno)); | |
1178 | return DEFER; | |
1179 | } | |
8e669ac1 | 1180 | |
8523533c | 1181 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { |
f1e894f3 | 1182 | (void)close(sock); |
8523533c TK |
1183 | log_write(0, LOG_MAIN|LOG_PANIC, |
1184 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1185 | inet_ntoa(in), port, strerror(errno)); | |
1186 | return DEFER; | |
1187 | } | |
2376f2f5 TK |
1188 | |
1189 | if (strcmpic(clamd_options2,US"local") == 0) { | |
1190 | ||
1191 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ | |
8e669ac1 | 1192 | |
b07e6aa3 | 1193 | (void)string_format(file_name,1024,"SCAN %s/scan/%s\n", spool_directory, message_id); |
8e669ac1 | 1194 | |
2376f2f5 | 1195 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) { |
f1e894f3 | 1196 | (void)close(sock); |
2376f2f5 TK |
1197 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", |
1198 | strerror(errno)); | |
1199 | return DEFER; | |
1200 | } | |
1201 | } else { | |
1202 | ||
1203 | /* Pass the string to ClamAV (7 = "STREAM\n") */ | |
1204 | ||
1205 | if (send(sock, "STREAM\n", 7, 0) < 0) { | |
f1e894f3 | 1206 | (void)close(sock); |
2376f2f5 TK |
1207 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", |
1208 | strerror(errno)); | |
1209 | return DEFER; | |
1210 | } | |
1211 | memset(av_buffer2, 0, sizeof(av_buffer2)); | |
a9ccd69a | 1212 | bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT); |
2376f2f5 TK |
1213 | |
1214 | if (bread < 0) { | |
1215 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1216 | "malware acl condition: clamd: unable to read PORT from socket (%s)", | |
1217 | strerror(errno)); | |
1218 | return DEFER; | |
1219 | } | |
8e669ac1 | 1220 | |
2376f2f5 TK |
1221 | if (bread == sizeof(av_buffer)) { |
1222 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1223 | "malware acl condition: clamd: buffer too small"); | |
1224 | return DEFER; | |
1225 | } | |
8e669ac1 | 1226 | |
2376f2f5 TK |
1227 | if (!(*av_buffer2)) { |
1228 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1229 | "malware acl condition: clamd: ClamAV returned null"); | |
1230 | return DEFER; | |
1231 | } | |
8e669ac1 | 1232 | |
2376f2f5 | 1233 | av_buffer2[bread] = '\0'; |
3d2a6e4d | 1234 | if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) { |
2376f2f5 TK |
1235 | log_write(0, LOG_MAIN|LOG_PANIC, |
1236 | "malware acl condition: clamd: Expected port information from clamd, got '%s'", av_buffer2); | |
1237 | return DEFER; | |
1238 | }; | |
8e669ac1 | 1239 | |
2376f2f5 TK |
1240 | if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) { |
1241 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1242 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1243 | strerror(errno)); | |
1244 | return DEFER; | |
1245 | } | |
8e669ac1 | 1246 | |
2376f2f5 | 1247 | if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { |
f1e894f3 | 1248 | (void)close(sockData); |
2376f2f5 TK |
1249 | log_write(0, LOG_MAIN|LOG_PANIC, |
1250 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1251 | inet_ntoa(in), port, strerror(errno)); | |
1252 | return DEFER; | |
1253 | } | |
1254 | ||
b07e6aa3 | 1255 | (void)string_format(scanrequest, 1024,CS"%s/scan/%s/%s.eml", |
384152a6 TK |
1256 | spool_directory, message_id, message_id); |
1257 | ||
1258 | /* calc file size */ | |
1259 | clam_fd = open(CS scanrequest, O_RDONLY); | |
1260 | if (clam_fd == -1) { | |
1261 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1262 | "malware acl condition: clamd: can't open spool file %s: %s", | |
1263 | scanrequest, strerror(errno)); | |
1264 | return DEFER; | |
1265 | } | |
1266 | fsize = lseek(clam_fd, 0, SEEK_END); | |
1267 | if (fsize == -1) { | |
1268 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1269 | "malware acl condition: clamd: can't seek spool file %s: %s", | |
1270 | scanrequest, strerror(errno)); | |
1271 | return DEFER; | |
1272 | } | |
1273 | lseek(clam_fd, 0, SEEK_SET); | |
1274 | ||
1275 | clamav_fbuf = (uschar *) malloc (fsize); | |
1276 | if (!clamav_fbuf) { | |
f1e894f3 PH |
1277 | (void)close(sockData); |
1278 | (void)close(clam_fd); | |
384152a6 TK |
1279 | log_write(0, LOG_MAIN|LOG_PANIC, |
1280 | "malware acl condition: clamd: unable to allocate memory %u for file (%s)", | |
1281 | fsize, scanrequest); | |
1282 | return DEFER; | |
1283 | } | |
1284 | ||
1285 | result = read (clam_fd, clamav_fbuf, fsize); | |
1286 | if (result == -1) { | |
f1e894f3 PH |
1287 | (void)close(sockData); |
1288 | (void)close(clam_fd); | |
384152a6 TK |
1289 | free(clamav_fbuf); |
1290 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1291 | "malware acl condition: clamd: can't read spool file %s: %s", | |
1292 | scanrequest, strerror(errno)); | |
1293 | return DEFER; | |
1294 | } | |
f1e894f3 | 1295 | (void)close(clam_fd); |
384152a6 TK |
1296 | |
1297 | /* send file body to socket */ | |
1298 | if (send(sockData, clamav_fbuf, fsize, 0) < 0) { | |
f1e894f3 | 1299 | (void)close(sockData); |
384152a6 TK |
1300 | free(clamav_fbuf); |
1301 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1302 | "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port); | |
1303 | return DEFER; | |
1304 | } | |
1305 | free(clamav_fbuf); | |
f1e894f3 | 1306 | (void)close(sockData); |
2376f2f5 | 1307 | } |
8523533c TK |
1308 | } |
1309 | else { | |
1310 | /* open the local socket */ | |
1311 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
1312 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1313 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1314 | strerror(errno)); | |
1315 | return DEFER; | |
1316 | } | |
8e669ac1 | 1317 | |
8523533c TK |
1318 | server.sun_family = AF_UNIX; |
1319 | Ustrcpy(server.sun_path, clamd_options); | |
8e669ac1 | 1320 | |
8523533c | 1321 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { |
f1e894f3 | 1322 | (void)close(sock); |
8523533c TK |
1323 | log_write(0, LOG_MAIN|LOG_PANIC, |
1324 | "malware acl condition: clamd: unable to connect to UNIX socket %s (%s)", | |
1325 | clamd_options, strerror(errno) ); | |
1326 | return DEFER; | |
1327 | } | |
1328 | } | |
8e669ac1 | 1329 | |
8523533c | 1330 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ |
8e669ac1 | 1331 | |
b07e6aa3 | 1332 | (void)string_format(file_name,1024,"SCAN %s/scan/%s\n", spool_directory, message_id); |
8e669ac1 | 1333 | |
8523533c | 1334 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) { |
f1e894f3 | 1335 | (void)close(sock); |
8523533c TK |
1336 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", |
1337 | strerror(errno)); | |
1338 | return DEFER; | |
1339 | } | |
8e669ac1 PH |
1340 | |
1341 | /* | |
8523533c | 1342 | We're done sending, close socket for writing. |
8e669ac1 | 1343 | |
8523533c | 1344 | One user reported that clamd 0.70 does not like this any more ... |
8e669ac1 | 1345 | |
8523533c | 1346 | */ |
8e669ac1 | 1347 | |
8523533c | 1348 | /* shutdown(sock, SHUT_WR); */ |
8e669ac1 | 1349 | |
8523533c TK |
1350 | /* Read the result */ |
1351 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1352 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
f1e894f3 | 1353 | (void)close(sock); |
8523533c TK |
1354 | |
1355 | if (!(bread > 0)) { | |
1356 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1357 | "malware acl condition: clamd: unable to read from socket (%s)", | |
1358 | strerror(errno)); | |
1359 | return DEFER; | |
1360 | } | |
8e669ac1 | 1361 | |
8523533c TK |
1362 | if (bread == sizeof(av_buffer)) { |
1363 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1364 | "malware acl condition: clamd: buffer too small"); | |
1365 | return DEFER; | |
1366 | } | |
8e669ac1 | 1367 | |
8523533c TK |
1368 | /* Check the result. ClamAV Returns |
1369 | infected: -> "<filename>: <virusname> FOUND" | |
1370 | not-infected: -> "<filename>: OK" | |
384152a6 | 1371 | error: -> "<filename>: <errcode> ERROR */ |
8e669ac1 | 1372 | |
8523533c TK |
1373 | if (!(*av_buffer)) { |
1374 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1375 | "malware acl condition: clamd: ClamAV returned null"); | |
1376 | return DEFER; | |
1377 | } | |
8e669ac1 | 1378 | |
3c5cd616 TK |
1379 | /* strip newline at the end */ |
1380 | p = av_buffer + Ustrlen(av_buffer) - 1; | |
1381 | if( *p == '\n' ) *p = '\0'; | |
1382 | ||
8523533c TK |
1383 | /* colon in returned output? */ |
1384 | if((p = Ustrrchr(av_buffer,':')) == NULL) { | |
1385 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1386 | "malware acl condition: clamd: ClamAV returned malformed result: %s", | |
8e669ac1 | 1387 | av_buffer); |
8523533c TK |
1388 | return DEFER; |
1389 | } | |
8e669ac1 | 1390 | |
3c5cd616 | 1391 | /* strip filename */ |
8523533c TK |
1392 | ++p; |
1393 | while (*p == ' ') ++p; | |
1394 | vname = p; | |
8523533c TK |
1395 | if ((p = Ustrstr(vname, "FOUND"))!=NULL) { |
1396 | *p=0; | |
1397 | for (--p;p>vname && *p<=32;p--) *p=0; | |
1398 | for (;*vname==32;vname++); | |
1399 | Ustrcpy(malware_name_buffer,vname); | |
1400 | malware_name = malware_name_buffer; | |
1401 | } | |
1402 | else { | |
1403 | if (Ustrstr(vname, "ERROR")!=NULL) { | |
1404 | /* ClamAV reports ERROR | |
1405 | Find line start */ | |
1406 | for (;*vname!='\n' && vname>av_buffer; vname--); | |
1407 | if (*vname=='\n') vname++; | |
1408 | ||
1409 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1410 | "malware acl condition: clamd: ClamAV returned %s",vname); | |
1411 | return DEFER; | |
1412 | } | |
1413 | else { | |
1414 | /* Everything should be OK */ | |
1415 | malware_name = NULL; | |
1416 | } | |
1417 | } | |
1418 | } | |
1419 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1420 | |
1421 | ||
8523533c TK |
1422 | /* "mksd" scanner type --------------------------------------------------- */ |
1423 | else if (strcmpic(scanner_name,US"mksd") == 0) { | |
1424 | uschar *mksd_options; | |
1425 | char *mksd_options_end; | |
1426 | uschar mksd_options_buffer[32]; | |
1427 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1428 | struct sockaddr_un server; | |
1429 | int sock; | |
1430 | int retval; | |
8e669ac1 | 1431 | |
8523533c TK |
1432 | if ((mksd_options = string_nextinlist(&av_scanner_work, &sep, |
1433 | mksd_options_buffer, | |
1434 | sizeof(mksd_options_buffer))) != NULL) { | |
1435 | mksd_maxproc = (int) strtol(CS mksd_options, &mksd_options_end, 10); | |
384152a6 TK |
1436 | if ((*mksd_options == '\0') || (*mksd_options_end != '\0') || |
1437 | (mksd_maxproc < 1) || (mksd_maxproc > 32)) { | |
8523533c TK |
1438 | log_write(0, LOG_MAIN|LOG_PANIC, |
1439 | "malware acl condition: mksd: invalid option '%s'", mksd_options); | |
1440 | return DEFER; | |
1441 | } | |
1442 | } | |
8e669ac1 | 1443 | |
8523533c TK |
1444 | /* open the mksd socket */ |
1445 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1446 | if (sock < 0) { | |
1447 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1448 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1449 | return DEFER; |
8523533c TK |
1450 | } |
1451 | server.sun_family = AF_UNIX; | |
1452 | Ustrcpy(server.sun_path, "/var/run/mksd/socket"); | |
1453 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1454 | (void)close(sock); |
8523533c TK |
1455 | log_write(0, LOG_MAIN|LOG_PANIC, |
1456 | "malware acl condition: unable to connect to mksd UNIX socket (/var/run/mksd/socket). errno=%d", errno); | |
1457 | return DEFER; | |
1458 | } | |
8e669ac1 | 1459 | |
8523533c | 1460 | malware_name = NULL; |
8e669ac1 | 1461 | |
8523533c | 1462 | retval = mksd_scan_packed(sock); |
8e669ac1 | 1463 | |
8523533c TK |
1464 | if (retval != OK) |
1465 | return retval; | |
1466 | } | |
1467 | /* ----------------------------------------------------------------------- */ | |
1468 | ||
1469 | /* "unknown" scanner type ------------------------------------------------- */ | |
1470 | else { | |
1471 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1472 | "malware condition: unknown scanner type '%s'", scanner_name); | |
1473 | return DEFER; | |
1474 | }; | |
1475 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1476 | |
8523533c TK |
1477 | /* set "been here, done that" marker */ |
1478 | malware_ok = 1; | |
1479 | }; | |
1480 | ||
1481 | /* match virus name against pattern (caseless ------->----------v) */ | |
1482 | if ( (malware_name != NULL) && | |
1483 | (regex_match_and_setup(re, malware_name, 0, -1)) ) { | |
1484 | return OK; | |
1485 | } | |
1486 | else { | |
1487 | return FAIL; | |
1488 | }; | |
1489 | } | |
1490 | ||
1491 | ||
1492 | /* simple wrapper for reading lines from sockets */ | |
1493 | int recv_line(int sock, uschar *buffer, int size) { | |
1494 | uschar *p = buffer; | |
1495 | ||
1496 | memset(buffer,0,size); | |
1497 | /* read until \n */ | |
1498 | while(recv(sock,p,1,0) > -1) { | |
1499 | if ((p-buffer) > (size-2)) break; | |
1500 | if (*p == '\n') break; | |
1501 | if (*p != '\r') p++; | |
1502 | }; | |
1503 | *p = '\0'; | |
1504 | ||
1505 | return (p-buffer); | |
1506 | } | |
1507 | ||
1508 | ||
1509 | /* ============= private routines for the "mksd" scanner type ============== */ | |
1510 | ||
1511 | #include <sys/uio.h> | |
1512 | ||
1513 | int mksd_writev (int sock, struct iovec *iov, int iovcnt) | |
1514 | { | |
1515 | int i; | |
8e669ac1 | 1516 | |
8523533c TK |
1517 | for (;;) { |
1518 | do | |
1519 | i = writev (sock, iov, iovcnt); | |
1520 | while ((i < 0) && (errno == EINTR)); | |
1521 | if (i <= 0) { | |
1522 | close (sock); | |
1523 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1524 | "malware acl condition: unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
1525 | return -1; | |
1526 | } | |
8e669ac1 | 1527 | |
8523533c TK |
1528 | for (;;) |
1529 | if (i >= iov->iov_len) { | |
1530 | if (--iovcnt == 0) | |
1531 | return 0; | |
1532 | i -= iov->iov_len; | |
1533 | iov++; | |
1534 | } else { | |
1535 | iov->iov_len -= i; | |
1536 | iov->iov_base = CS iov->iov_base + i; | |
1537 | break; | |
1538 | } | |
1539 | } | |
1540 | } | |
1541 | ||
1542 | int mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size) | |
1543 | { | |
1544 | int offset = 0; | |
1545 | int i; | |
8e669ac1 | 1546 | |
8523533c TK |
1547 | do { |
1548 | if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) { | |
1549 | close (sock); | |
1550 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1551 | "malware acl condition: unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
1552 | return -1; | |
1553 | } | |
8e669ac1 | 1554 | |
8523533c TK |
1555 | offset += i; |
1556 | /* offset == av_buffer_size -> buffer full */ | |
1557 | if (offset == av_buffer_size) { | |
1558 | close (sock); | |
1559 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1560 | "malware acl condition: malformed reply received from mksd"); | |
1561 | return -1; | |
1562 | } | |
1563 | } while (av_buffer[offset-1] != '\n'); | |
8e669ac1 | 1564 | |
8523533c TK |
1565 | av_buffer[offset] = '\0'; |
1566 | return offset; | |
1567 | } | |
1568 | ||
1569 | int mksd_parse_line (char *line) | |
1570 | { | |
1571 | char *p; | |
8e669ac1 | 1572 | |
8523533c TK |
1573 | switch (*line) { |
1574 | case 'O': | |
1575 | /* OK */ | |
1576 | return OK; | |
1577 | case 'E': | |
1578 | case 'A': | |
1579 | /* ERR */ | |
1580 | if ((p = strchr (line, '\n')) != NULL) | |
1581 | (*p) = '\0'; | |
1582 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1583 | "malware acl condition: mksd scanner failed: %s", line); | |
1584 | return DEFER; | |
1585 | default: | |
1586 | /* VIR */ | |
1587 | if ((p = strchr (line, '\n')) != NULL) { | |
1588 | (*p) = '\0'; | |
1589 | if (((p-line) > 5) && ((p-line) < sizeof (malware_name_buffer)) && (line[3] == ' ')) | |
1590 | if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) { | |
1591 | (*p) = '\0'; | |
1592 | Ustrcpy (malware_name_buffer, line+4); | |
384152a6 | 1593 | malware_name = malware_name_buffer; |
8523533c TK |
1594 | return OK; |
1595 | } | |
1596 | } | |
1597 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1598 | "malware acl condition: malformed reply received from mksd: %s", line); | |
1599 | return DEFER; | |
1600 | } | |
1601 | } | |
1602 | ||
1603 | int mksd_scan_packed (int sock) | |
1604 | { | |
1605 | struct iovec iov[7]; | |
1606 | char *cmd = "MSQ/scan/.eml\n"; | |
1607 | uschar av_buffer[1024]; | |
8e669ac1 | 1608 | |
8523533c TK |
1609 | iov[0].iov_base = cmd; |
1610 | iov[0].iov_len = 3; | |
1611 | iov[1].iov_base = CS spool_directory; | |
1612 | iov[1].iov_len = Ustrlen (spool_directory); | |
1613 | iov[2].iov_base = cmd + 3; | |
1614 | iov[2].iov_len = 6; | |
1615 | iov[3].iov_base = iov[5].iov_base = CS message_id; | |
1616 | iov[3].iov_len = iov[5].iov_len = Ustrlen (message_id); | |
1617 | iov[4].iov_base = cmd + 3; | |
1618 | iov[4].iov_len = 1; | |
1619 | iov[6].iov_base = cmd + 9; | |
1620 | iov[6].iov_len = 5; | |
8e669ac1 | 1621 | |
8523533c TK |
1622 | if (mksd_writev (sock, iov, 7) < 0) |
1623 | return DEFER; | |
8e669ac1 | 1624 | |
8523533c TK |
1625 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0) |
1626 | return DEFER; | |
8e669ac1 | 1627 | |
8523533c | 1628 | close (sock); |
8e669ac1 | 1629 | |
8523533c TK |
1630 | return mksd_parse_line (CS av_buffer); |
1631 | } | |
1632 | ||
1633 | #endif |