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 virus (malware) scanners. Called from acl.c. */ | |
9 | ||
10 | #include "exim.h" | |
11 | #ifdef WITH_CONTENT_SCAN | |
12 | ||
599dcb77 TL |
13 | /* The maximum number of clamd servers that are supported in the configuration */ |
14 | #define MAX_CLAMD_SERVERS 32 | |
15 | #define MAX_CLAMD_SERVERS_S "32" | |
16 | /* Maximum length of the hostname that can be specified in the clamd address list */ | |
17 | #define MAX_CLAMD_ADDRESS_LENGTH 64 | |
18 | #define MAX_CLAMD_ADDRESS_LENGTH_S "64" | |
19 | ||
20 | typedef struct clamd_address_container { | |
21 | uschar tcp_addr[MAX_CLAMD_ADDRESS_LENGTH]; | |
22 | unsigned int tcp_port; | |
23 | } clamd_address_container; | |
24 | ||
8523533c | 25 | /* declaration of private routines */ |
8544e77a PP |
26 | static int mksd_scan_packed(int sock, uschar *scan_filename); |
27 | static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking); | |
8523533c TK |
28 | |
29 | /* SHUT_WR seems to be undefined on Unixware? */ | |
30 | #ifndef SHUT_WR | |
31 | #define SHUT_WR 1 | |
32 | #endif | |
33 | ||
a9ccd69a PH |
34 | |
35 | #define MALWARE_TIMEOUT 120 | |
36 | ||
37 | ||
8523533c TK |
38 | #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ |
39 | #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
40 | #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
41 | ||
2376f2f5 TK |
42 | #define DERR_READ_ERR (1<<0) /* read error */ |
43 | #define DERR_NOMEMORY (1<<2) /* no memory */ | |
44 | #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
45 | #define DERR_BAD_CALL (1<<15) /* wrong command */ | |
46 | ||
8e669ac1 | 47 | /* Routine to check whether a system is big- or litte-endian. |
8523533c TK |
48 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
49 | Needed for proper kavdaemon implementation. Sigh. */ | |
50 | #define BIG_MY_ENDIAN 0 | |
51 | #define LITTLE_MY_ENDIAN 1 | |
52 | int test_byte_order(void); | |
53 | int test_byte_order() { | |
54 | short int word = 0x0001; | |
55 | char *byte = (char *) &word; | |
56 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); | |
57 | } | |
58 | ||
59 | uschar malware_name_buffer[256]; | |
60 | int malware_ok = 0; | |
61 | ||
8544e77a PP |
62 | /* Gross hacks for the -bmalware option; perhaps we should just create |
63 | the scan directory normally for that case, but look into rigging up the | |
64 | needed header variables if not already set on the command-line? */ | |
65 | extern int spool_mbox_ok; | |
66 | extern uschar spooled_message_id[17]; | |
67 | ||
68 | /************************************************* | |
69 | * Scan an email for malware * | |
70 | *************************************************/ | |
71 | ||
72 | /* This is the normal interface for scanning an email, which doesn't need a | |
73 | filename; it's a wrapper around the malware_file function. | |
74 | ||
75 | Arguments: | |
76 | listptr the list of options to the "malware = ..." ACL condition | |
77 | ||
78 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
79 | where true means malware was found (condition applies) | |
80 | */ | |
8523533c | 81 | int malware(uschar **listptr) { |
8544e77a PP |
82 | uschar scan_filename[1024]; |
83 | BOOL fits; | |
9e949f00 | 84 | int ret; |
8544e77a PP |
85 | |
86 | fits = string_format(scan_filename, sizeof(scan_filename), | |
87 | CS"%s/scan/%s/%s.eml", spool_directory, message_id, message_id); | |
88 | if (!fits) | |
89 | { | |
9e949f00 | 90 | av_failed = TRUE; |
8544e77a PP |
91 | log_write(0, LOG_MAIN|LOG_PANIC, |
92 | "malware filename does not fit in buffer [malware()]"); | |
93 | return DEFER; | |
94 | } | |
95 | ||
9e949f00 PP |
96 | ret = malware_internal(listptr, scan_filename, FALSE); |
97 | if (ret == DEFER) av_failed = TRUE; | |
98 | ||
99 | return ret; | |
8544e77a PP |
100 | } |
101 | ||
102 | ||
103 | /************************************************* | |
104 | * Scan a file for malware * | |
105 | *************************************************/ | |
106 | ||
107 | /* This is a test wrapper for scanning an email, which is not used in | |
108 | normal processing. Scan any file, using the Exim scanning interface. | |
109 | This function tampers with various global variables so is unsafe to use | |
110 | in any other context. | |
111 | ||
112 | Arguments: | |
113 | eml_filename a file holding the message to be scanned | |
114 | ||
115 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
116 | where true means malware was found (condition applies) | |
117 | */ | |
dbc4b90d PP |
118 | int |
119 | malware_in_file(uschar *eml_filename) { | |
8544e77a PP |
120 | uschar *scan_options[2]; |
121 | uschar message_id_buf[64]; | |
122 | int ret; | |
123 | ||
73a46702 | 124 | scan_options[0] = US"*"; |
8544e77a PP |
125 | scan_options[1] = NULL; |
126 | ||
127 | /* spool_mbox() assumes various parameters exist, when creating | |
128 | the relevant directory and the email within */ | |
129 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
17c76198 | 130 | "dummy-%d", vaguely_random_number(INT_MAX)); |
8544e77a | 131 | message_id = message_id_buf; |
73a46702 PP |
132 | sender_address = US"malware-sender@example.net"; |
133 | return_path = US""; | |
8544e77a | 134 | recipients_list = NULL; |
73a46702 | 135 | receive_add_recipient(US"malware-victim@example.net", -1); |
8544e77a PP |
136 | enable_dollar_recipients = TRUE; |
137 | ||
138 | ret = malware_internal(scan_options, eml_filename, TRUE); | |
139 | ||
73a46702 | 140 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
8544e77a PP |
141 | spool_mbox_ok = 1; |
142 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
143 | set, but if that changes, then it should apply to these tests too */ | |
144 | unspool_mbox(); | |
145 | ||
08488c86 PP |
146 | /* silence static analysis tools */ |
147 | message_id = NULL; | |
148 | ||
8544e77a PP |
149 | return ret; |
150 | } | |
151 | ||
152 | ||
153 | /************************************************* | |
154 | * Scan content for malware * | |
155 | *************************************************/ | |
156 | ||
157 | /* This is an internal interface for scanning an email; the normal interface | |
158 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
159 | ||
160 | Arguments: | |
161 | listptr the list of options to the "malware = ..." ACL condition | |
162 | eml_filename the file holding the email to be scanned | |
163 | faking whether or not we're faking this up for the -bmalware test | |
164 | ||
165 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
166 | where true means malware was found (condition applies) | |
167 | */ | |
168 | static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking) { | |
8523533c TK |
169 | int sep = 0; |
170 | uschar *list = *listptr; | |
171 | uschar *av_scanner_work = av_scanner; | |
172 | uschar *scanner_name; | |
173 | uschar scanner_name_buffer[16]; | |
174 | uschar *malware_regex; | |
175 | uschar malware_regex_buffer[64]; | |
176 | uschar malware_regex_default[] = ".+"; | |
f7b63901 | 177 | unsigned long mbox_size; |
8523533c TK |
178 | FILE *mbox_file; |
179 | int roffset; | |
180 | const pcre *re; | |
181 | const uschar *rerror; | |
8e669ac1 | 182 | |
8523533c | 183 | /* make sure the eml mbox file is spooled up */ |
8544e77a | 184 | mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL); |
8523533c TK |
185 | if (mbox_file == NULL) { |
186 | /* error while spooling */ | |
187 | log_write(0, LOG_MAIN|LOG_PANIC, | |
188 | "malware acl condition: error while creating mbox spool file"); | |
8e669ac1 | 189 | return DEFER; |
8523533c TK |
190 | }; |
191 | /* none of our current scanners need the mbox | |
192 | file as a stream, so we can close it right away */ | |
f1e894f3 | 193 | (void)fclose(mbox_file); |
8e669ac1 | 194 | |
8523533c TK |
195 | /* extract the malware regex to match against from the option list */ |
196 | if ((malware_regex = string_nextinlist(&list, &sep, | |
197 | malware_regex_buffer, | |
198 | sizeof(malware_regex_buffer))) != NULL) { | |
8e669ac1 | 199 | |
8523533c | 200 | /* parse 1st option */ |
8e669ac1 | 201 | if ( (strcmpic(malware_regex,US"false") == 0) || |
8523533c TK |
202 | (Ustrcmp(malware_regex,"0") == 0) ) { |
203 | /* explicitly no matching */ | |
204 | return FAIL; | |
205 | }; | |
8e669ac1 | 206 | |
8523533c | 207 | /* special cases (match anything except empty) */ |
8e669ac1 PH |
208 | if ( (strcmpic(malware_regex,US"true") == 0) || |
209 | (Ustrcmp(malware_regex,"*") == 0) || | |
8523533c TK |
210 | (Ustrcmp(malware_regex,"1") == 0) ) { |
211 | malware_regex = malware_regex_default; | |
212 | }; | |
213 | } | |
214 | else { | |
215 | /* empty means "don't match anything" */ | |
216 | return FAIL; | |
217 | }; | |
218 | ||
ee873c8c TK |
219 | /* Reset sep that is set by previous string_nextinlist() call */ |
220 | sep = 0; | |
221 | ||
8523533c TK |
222 | /* compile the regex, see if it works */ |
223 | re = pcre_compile(CS malware_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
224 | if (re == NULL) { | |
225 | log_write(0, LOG_MAIN|LOG_PANIC, | |
226 | "malware acl condition: regular expression error in '%s': %s at offset %d", malware_regex, rerror, roffset); | |
227 | return DEFER; | |
228 | }; | |
229 | ||
230 | /* if av_scanner starts with a dollar, expand it first */ | |
231 | if (*av_scanner == '$') { | |
232 | av_scanner_work = expand_string(av_scanner); | |
233 | if (av_scanner_work == NULL) { | |
234 | log_write(0, LOG_MAIN|LOG_PANIC, | |
235 | "malware acl condition: av_scanner starts with $, but expansion failed: %s", expand_string_message); | |
236 | return DEFER; | |
237 | } | |
238 | else { | |
239 | debug_printf("Expanded av_scanner global: %s\n", av_scanner_work); | |
240 | /* disable result caching in this case */ | |
241 | malware_name = NULL; | |
242 | malware_ok = 0; | |
243 | }; | |
244 | } | |
245 | ||
246 | /* Do not scan twice. */ | |
247 | if (malware_ok == 0) { | |
248 | ||
249 | /* find the scanner type from the av_scanner option */ | |
250 | if ((scanner_name = string_nextinlist(&av_scanner_work, &sep, | |
251 | scanner_name_buffer, | |
252 | sizeof(scanner_name_buffer))) == NULL) { | |
253 | /* no scanner given */ | |
254 | log_write(0, LOG_MAIN|LOG_PANIC, | |
255 | "malware acl condition: av_scanner configuration variable is empty"); | |
256 | return DEFER; | |
257 | }; | |
8e669ac1 | 258 | |
e5496194 TK |
259 | /* "f-protd" scanner type ----------------------------------------------- */ |
260 | if (strcmpic(scanner_name, US"f-protd") == 0) { | |
261 | uschar *fp_options, *fp_scan_option; | |
262 | uschar fp_scan_option_buffer[1024]; | |
263 | uschar fp_options_buffer[1024]; | |
264 | uschar fp_options_default[] = "localhost 10200-10204"; | |
265 | uschar hostname[256]; | |
266 | unsigned int port, portlow, porthigh, connect_ok=0, detected=0, par_count = 0; | |
267 | struct hostent *he; | |
268 | struct in_addr in; | |
269 | int sock; | |
270 | uschar scanrequest[2048], buf[32768], *strhelper, *strhelper2; | |
271 | ||
272 | if ((fp_options = string_nextinlist(&av_scanner_work, &sep, | |
273 | fp_options_buffer, sizeof(fp_options_buffer))) == NULL) { | |
274 | /* no options supplied, use default options */ | |
275 | fp_options = fp_options_default; | |
276 | }; | |
277 | ||
278 | /* extract host and port part */ | |
279 | if ( sscanf(CS fp_options, "%s %u-%u", hostname, &portlow, &porthigh) != 3 ) { | |
280 | if ( sscanf(CS fp_options, "%s %u", hostname, &portlow) != 2 ) { | |
281 | log_write(0, LOG_MAIN|LOG_PANIC, | |
282 | "malware acl condition: f-protd: invalid socket '%s'", fp_options); | |
283 | return DEFER; | |
284 | } | |
285 | porthigh = portlow; | |
286 | } | |
287 | ||
288 | /* Lookup the host */ | |
289 | if((he = gethostbyname(CS hostname)) == 0) { | |
290 | log_write(0, LOG_MAIN|LOG_PANIC, | |
291 | "malware acl condition: f-protd: failed to lookup host '%s'", hostname); | |
292 | return DEFER; | |
293 | } | |
294 | ||
295 | in = *(struct in_addr *) he->h_addr_list[0]; | |
296 | port = portlow; | |
297 | ||
298 | ||
299 | /* Open the f-protd TCP socket */ | |
300 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
301 | log_write(0, LOG_MAIN|LOG_PANIC, | |
302 | "malware acl condition: f-protd: unable to acquire socket (%s)", | |
303 | strerror(errno)); | |
304 | return DEFER; | |
305 | } | |
306 | ||
307 | /* Try to connect to all portslow-high until connection is established */ | |
308 | for (port = portlow; !connect_ok && port < porthigh; port++) { | |
309 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0) { | |
310 | connect_ok = 1; | |
311 | } | |
312 | } | |
313 | ||
314 | if ( !connect_ok ) { | |
315 | log_write(0, LOG_MAIN|LOG_PANIC, | |
316 | "malware acl condition: f-protd: connection to %s, port %u-%u failed (%s)", | |
317 | inet_ntoa(in), portlow, porthigh, strerror(errno)); | |
318 | (void)close(sock); | |
319 | return DEFER; | |
320 | } | |
321 | ||
8544e77a PP |
322 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name); |
323 | (void)string_format(scanrequest, 1024, CS"GET %s", eml_filename); | |
e5496194 TK |
324 | |
325 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, | |
326 | fp_scan_option_buffer, sizeof(fp_scan_option_buffer))) != NULL) { | |
327 | if ( par_count ) { | |
328 | Ustrcat(scanrequest, "%20"); | |
329 | } else { | |
330 | Ustrcat(scanrequest, "?"); | |
331 | } | |
332 | Ustrcat(scanrequest, fp_scan_option); | |
333 | par_count++; | |
334 | } | |
335 | Ustrcat(scanrequest, " HTTP/1.0\r\n\r\n"); | |
336 | ||
337 | /* send scan request */ | |
338 | if (send(sock, &scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
339 | (void)close(sock); | |
340 | log_write(0, LOG_MAIN|LOG_PANIC, | |
341 | "malware acl condition: f-protd: unable to send command to socket (%s)", scanrequest); | |
342 | return DEFER; | |
343 | } | |
344 | ||
345 | /* We get a lot of empty lines, so we need this hack to check for any data at all */ | |
346 | while( recv(sock, buf, 1, MSG_PEEK) > 0 ) { | |
347 | if ( recv_line(sock, buf, 32768) > 0) { | |
348 | if ( Ustrstr(buf, US"<detected type=\"") != NULL ) { | |
349 | detected = 1; | |
350 | } else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) { | |
7156b1ef | 351 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) { |
e5496194 TK |
352 | *strhelper2 = '\0'; |
353 | Ustrcpy(malware_name_buffer, strhelper + 6); | |
354 | } | |
355 | } else if ( Ustrstr(buf, US"<summary code=\"") ) { | |
356 | if ( Ustrstr(buf, US"<summary code=\"11\">") ) { | |
357 | malware_name = malware_name_buffer; | |
358 | } else { | |
359 | malware_name = NULL; | |
360 | } | |
361 | } | |
362 | } | |
363 | } | |
364 | (void)close(sock); | |
365 | } | |
384152a6 TK |
366 | /* "drweb" scanner type ----------------------------------------------- */ |
367 | /* v0.1 - added support for tcp sockets */ | |
368 | /* v0.0 - initial release -- support for unix sockets */ | |
e5496194 | 369 | else if (strcmpic(scanner_name,US"drweb") == 0) { |
384152a6 TK |
370 | uschar *drweb_options; |
371 | uschar drweb_options_buffer[1024]; | |
372 | uschar drweb_options_default[] = "/usr/local/drweb/run/drwebd.sock"; | |
373 | struct sockaddr_un server; | |
374 | int sock, result, ovector[30]; | |
375 | unsigned int port, fsize; | |
376 | uschar tmpbuf[1024], *drweb_fbuf; | |
384152a6 TK |
377 | uschar drweb_match_string[128]; |
378 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
379 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
380 | unsigned long bread; | |
381 | uschar hostname[256]; | |
382 | struct hostent *he; | |
383 | struct in_addr in; | |
384 | pcre *drweb_re; | |
385 | ||
386 | if ((drweb_options = string_nextinlist(&av_scanner_work, &sep, | |
387 | drweb_options_buffer, sizeof(drweb_options_buffer))) == NULL) { | |
388 | /* no options supplied, use default options */ | |
389 | drweb_options = drweb_options_default; | |
390 | }; | |
391 | ||
392 | if (*drweb_options != '/') { | |
393 | ||
394 | /* extract host and port part */ | |
395 | if( sscanf(CS drweb_options, "%s %u", hostname, &port) != 2 ) { | |
396 | log_write(0, LOG_MAIN|LOG_PANIC, | |
397 | "malware acl condition: drweb: invalid socket '%s'", drweb_options); | |
398 | return DEFER; | |
399 | } | |
400 | ||
401 | /* Lookup the host */ | |
402 | if((he = gethostbyname(CS hostname)) == 0) { | |
403 | log_write(0, LOG_MAIN|LOG_PANIC, | |
404 | "malware acl condition: drweb: failed to lookup host '%s'", hostname); | |
405 | return DEFER; | |
406 | } | |
407 | ||
408 | in = *(struct in_addr *) he->h_addr_list[0]; | |
409 | ||
410 | /* Open the drwebd TCP socket */ | |
411 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
412 | log_write(0, LOG_MAIN|LOG_PANIC, | |
413 | "malware acl condition: drweb: unable to acquire socket (%s)", | |
414 | strerror(errno)); | |
415 | return DEFER; | |
416 | } | |
417 | ||
418 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { | |
f1e894f3 | 419 | (void)close(sock); |
384152a6 TK |
420 | log_write(0, LOG_MAIN|LOG_PANIC, |
421 | "malware acl condition: drweb: connection to %s, port %u failed (%s)", | |
422 | inet_ntoa(in), port, strerror(errno)); | |
423 | return DEFER; | |
424 | } | |
425 | ||
426 | /* prepare variables */ | |
427 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
428 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
384152a6 TK |
429 | |
430 | /* calc file size */ | |
8544e77a | 431 | drweb_fd = open(CS eml_filename, O_RDONLY); |
384152a6 | 432 | if (drweb_fd == -1) { |
f1e894f3 | 433 | (void)close(sock); |
384152a6 TK |
434 | log_write(0, LOG_MAIN|LOG_PANIC, |
435 | "malware acl condition: drweb: can't open spool file %s: %s", | |
8544e77a | 436 | eml_filename, strerror(errno)); |
384152a6 TK |
437 | return DEFER; |
438 | } | |
439 | fsize = lseek(drweb_fd, 0, SEEK_END); | |
440 | if (fsize == -1) { | |
f1e894f3 PH |
441 | (void)close(sock); |
442 | (void)close(drweb_fd); | |
384152a6 TK |
443 | log_write(0, LOG_MAIN|LOG_PANIC, |
444 | "malware acl condition: drweb: can't seek spool file %s: %s", | |
8544e77a | 445 | eml_filename, strerror(errno)); |
384152a6 TK |
446 | return DEFER; |
447 | } | |
448 | drweb_slen = htonl(fsize); | |
449 | lseek(drweb_fd, 0, SEEK_SET); | |
450 | ||
8544e77a PP |
451 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s %u]\n", |
452 | scanner_name, hostname, port); | |
453 | ||
384152a6 TK |
454 | /* send scan request */ |
455 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
456 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
457 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
458 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) { | |
f1e894f3 PH |
459 | (void)close(sock); |
460 | (void)close(drweb_fd); | |
384152a6 TK |
461 | log_write(0, LOG_MAIN|LOG_PANIC, |
462 | "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options); | |
463 | return DEFER; | |
464 | } | |
465 | ||
466 | drweb_fbuf = (uschar *) malloc (fsize); | |
467 | if (!drweb_fbuf) { | |
f1e894f3 PH |
468 | (void)close(sock); |
469 | (void)close(drweb_fd); | |
384152a6 TK |
470 | log_write(0, LOG_MAIN|LOG_PANIC, |
471 | "malware acl condition: drweb: unable to allocate memory %u for file (%s)", | |
8544e77a | 472 | fsize, eml_filename); |
384152a6 TK |
473 | return DEFER; |
474 | } | |
475 | ||
476 | result = read (drweb_fd, drweb_fbuf, fsize); | |
477 | if (result == -1) { | |
f1e894f3 PH |
478 | (void)close(sock); |
479 | (void)close(drweb_fd); | |
384152a6 TK |
480 | free(drweb_fbuf); |
481 | log_write(0, LOG_MAIN|LOG_PANIC, | |
482 | "malware acl condition: drweb: can't read spool file %s: %s", | |
8544e77a | 483 | eml_filename, strerror(errno)); |
384152a6 TK |
484 | return DEFER; |
485 | } | |
f1e894f3 | 486 | (void)close(drweb_fd); |
384152a6 TK |
487 | |
488 | /* send file body to socket */ | |
489 | if (send(sock, drweb_fbuf, fsize, 0) < 0) { | |
f1e894f3 | 490 | (void)close(sock); |
384152a6 TK |
491 | free(drweb_fbuf); |
492 | log_write(0, LOG_MAIN|LOG_PANIC, | |
493 | "malware acl condition: drweb: unable to send file body to socket (%s)", drweb_options); | |
494 | return DEFER; | |
495 | } | |
f1e894f3 | 496 | (void)close(drweb_fd); |
384152a6 TK |
497 | } |
498 | else { | |
499 | /* open the drwebd UNIX socket */ | |
500 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
501 | if (sock < 0) { | |
502 | log_write(0, LOG_MAIN|LOG_PANIC, | |
503 | "malware acl condition: drweb: can't open UNIX socket"); | |
504 | return DEFER; | |
505 | } | |
506 | server.sun_family = AF_UNIX; | |
507 | Ustrcpy(server.sun_path, drweb_options); | |
508 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 509 | (void)close(sock); |
384152a6 TK |
510 | log_write(0, LOG_MAIN|LOG_PANIC, |
511 | "malware acl condition: drweb: unable to connect to socket (%s). errno=%d", drweb_options, errno); | |
512 | return DEFER; | |
513 | } | |
514 | ||
515 | /* prepare variables */ | |
516 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
517 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
8544e77a PP |
518 | drweb_slen = htonl(Ustrlen(eml_filename)); |
519 | ||
520 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n", | |
521 | scanner_name, drweb_options); | |
384152a6 TK |
522 | |
523 | /* send scan request */ | |
524 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
525 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
526 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
8544e77a | 527 | (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || |
384152a6 | 528 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) { |
f1e894f3 | 529 | (void)close(sock); |
384152a6 TK |
530 | log_write(0, LOG_MAIN|LOG_PANIC, |
531 | "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options); | |
532 | return DEFER; | |
533 | } | |
534 | } | |
535 | ||
536 | /* wait for result */ | |
537 | if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) { | |
f1e894f3 | 538 | (void)close(sock); |
384152a6 TK |
539 | log_write(0, LOG_MAIN|LOG_PANIC, |
540 | "malware acl condition: drweb: unable to read return code"); | |
541 | return DEFER; | |
542 | } | |
543 | drweb_rc = ntohl(drweb_rc); | |
544 | ||
545 | if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) { | |
f1e894f3 | 546 | (void)close(sock); |
384152a6 TK |
547 | log_write(0, LOG_MAIN|LOG_PANIC, |
548 | "malware acl condition: drweb: unable to read the number of viruses"); | |
549 | return DEFER; | |
550 | } | |
551 | drweb_vnum = ntohl(drweb_vnum); | |
552 | ||
553 | /* "virus(es) found" if virus number is > 0 */ | |
554 | if (drweb_vnum) | |
555 | { | |
556 | int i; | |
557 | uschar pre_malware_nb[256]; | |
558 | ||
559 | malware_name = malware_name_buffer; | |
560 | ||
561 | /* setup default virus name */ | |
562 | Ustrcpy(malware_name_buffer,"unknown"); | |
563 | ||
564 | /* read and concatenate virus names into one string */ | |
565 | for (i=0;i<drweb_vnum;i++) | |
566 | { | |
567 | /* read the size of report */ | |
568 | if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) { | |
f1e894f3 | 569 | (void)close(sock); |
384152a6 TK |
570 | log_write(0, LOG_MAIN|LOG_PANIC, |
571 | "malware acl condition: drweb: cannot read report size"); | |
572 | return DEFER; | |
573 | }; | |
574 | drweb_slen = ntohl(drweb_slen); | |
575 | ||
576 | /* read report body */ | |
577 | if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) { | |
f1e894f3 | 578 | (void)close(sock); |
384152a6 TK |
579 | log_write(0, LOG_MAIN|LOG_PANIC, |
580 | "malware acl condition: drweb: cannot read report string"); | |
581 | return DEFER; | |
582 | }; | |
583 | tmpbuf[drweb_slen] = '\0'; | |
584 | ||
585 | /* set up match regex, depends on retcode */ | |
586 | Ustrcpy(drweb_match_string, "infected\\swith\\s*(.+?)$"); | |
587 | ||
588 | drweb_re = pcre_compile( CS drweb_match_string, | |
589 | PCRE_COPT, | |
590 | (const char **)&rerror, | |
591 | &roffset, | |
592 | NULL ); | |
593 | ||
594 | /* try matcher on the line, grab substring */ | |
595 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
596 | if (result >= 2) { | |
597 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS pre_malware_nb, 255); | |
598 | } | |
599 | /* the first name we just copy to malware_name */ | |
600 | if (i==0) | |
601 | Ustrcpy(CS malware_name_buffer, CS pre_malware_nb); | |
602 | else { | |
603 | /* concatenate each new virus name to previous */ | |
604 | int slen = Ustrlen(malware_name_buffer); | |
605 | if (slen < (slen+Ustrlen(pre_malware_nb))) { | |
606 | Ustrcat(malware_name_buffer, "/"); | |
607 | Ustrcat(malware_name_buffer, pre_malware_nb); | |
608 | } | |
609 | } | |
610 | } | |
611 | } | |
612 | else { | |
1ba28e2b | 613 | const char *drweb_s = NULL; |
384152a6 TK |
614 | |
615 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
616 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
617 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
618 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
619 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
620 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
621 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
622 | * and others are ignored */ | |
623 | if (drweb_s) { | |
624 | log_write(0, LOG_MAIN|LOG_PANIC, | |
625 | "malware acl condition: drweb: drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s); | |
f1e894f3 | 626 | (void)close(sock); |
384152a6 TK |
627 | return DEFER; |
628 | } | |
629 | /* no virus found */ | |
630 | malware_name = NULL; | |
631 | }; | |
f1e894f3 | 632 | (void)close(sock); |
384152a6 TK |
633 | } |
634 | /* ----------------------------------------------------------------------- */ | |
8523533c TK |
635 | else if (strcmpic(scanner_name,US"aveserver") == 0) { |
636 | uschar *kav_options; | |
637 | uschar kav_options_buffer[1024]; | |
638 | uschar kav_options_default[] = "/var/run/aveserver"; | |
639 | uschar buf[32768]; | |
8523533c TK |
640 | struct sockaddr_un server; |
641 | int sock; | |
7e274b4b | 642 | int result; |
8e669ac1 | 643 | |
8523533c TK |
644 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
645 | kav_options_buffer, | |
646 | sizeof(kav_options_buffer))) == NULL) { | |
647 | /* no options supplied, use default options */ | |
648 | kav_options = kav_options_default; | |
649 | }; | |
8e669ac1 | 650 | |
8523533c TK |
651 | /* open the aveserver socket */ |
652 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
653 | if (sock < 0) { | |
654 | log_write(0, LOG_MAIN|LOG_PANIC, | |
655 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 656 | return DEFER; |
8523533c TK |
657 | } |
658 | server.sun_family = AF_UNIX; | |
659 | Ustrcpy(server.sun_path, kav_options); | |
660 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 661 | (void)close(sock); |
8523533c TK |
662 | log_write(0, LOG_MAIN|LOG_PANIC, |
663 | "malware acl condition: unable to connect to aveserver UNIX socket (%s). errno=%d", kav_options, errno); | |
664 | return DEFER; | |
665 | } | |
8e669ac1 | 666 | |
8523533c TK |
667 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
668 | recv_line(sock, buf, 32768); | |
669 | ||
670 | if (buf[0] != '2') { | |
671 | /* aveserver is having problems */ | |
f1e894f3 | 672 | (void)close(sock); |
8523533c TK |
673 | log_write(0, LOG_MAIN|LOG_PANIC, |
674 | "malware acl condition: aveserver is unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
675 | return DEFER; | |
676 | }; | |
8e669ac1 | 677 | |
8523533c | 678 | /* prepare our command */ |
8544e77a PP |
679 | (void)string_format(buf, 32768, "SCAN bPQRSTUW %s\r\n", eml_filename); |
680 | ||
681 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name); | |
8e669ac1 | 682 | |
8523533c TK |
683 | /* and send it */ |
684 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 685 | (void)close(sock); |
8523533c TK |
686 | log_write(0, LOG_MAIN|LOG_PANIC, |
687 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
688 | return DEFER; | |
689 | } | |
8e669ac1 | 690 | |
8523533c | 691 | malware_name = NULL; |
7e274b4b | 692 | result = 0; |
8523533c TK |
693 | /* read response lines, find malware name and final response */ |
694 | while (recv_line(sock, buf, 32768) > 0) { | |
695 | debug_printf("aveserver: %s\n", buf); | |
7e274b4b TK |
696 | if (buf[0] == '2') { |
697 | break; | |
698 | } else if (buf[0] == '5') { | |
699 | /* aveserver is having problems */ | |
700 | log_write(0, LOG_MAIN|LOG_PANIC, | |
8544e77a PP |
701 | "malware acl condition: unable to scan file %s (Responded: %s).", |
702 | eml_filename, buf); | |
7e274b4b TK |
703 | result = DEFER; |
704 | break; | |
705 | } else if (Ustrncmp(buf,"322",3) == 0) { | |
8523533c TK |
706 | uschar *p = Ustrchr(&buf[4],' '); |
707 | *p = '\0'; | |
708 | Ustrcpy(malware_name_buffer,&buf[4]); | |
709 | malware_name = malware_name_buffer; | |
7e274b4b TK |
710 | }; |
711 | } | |
712 | ||
713 | /* prepare our command */ | |
b07e6aa3 | 714 | (void)string_format(buf, 32768, "quit\r\n"); |
7e274b4b TK |
715 | |
716 | /* and send it */ | |
717 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 718 | (void)close(sock); |
7e274b4b TK |
719 | log_write(0, LOG_MAIN|LOG_PANIC, |
720 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
721 | return DEFER; | |
8523533c TK |
722 | } |
723 | ||
7e274b4b TK |
724 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
725 | recv_line(sock, buf, 32768); | |
726 | ||
727 | if (buf[0] != '2') { | |
728 | /* aveserver is having problems */ | |
f1e894f3 | 729 | (void)close(sock); |
7e274b4b TK |
730 | log_write(0, LOG_MAIN|LOG_PANIC, |
731 | "malware acl condition: unable to quit aveserver dialogue (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
732 | return DEFER; | |
733 | }; | |
734 | ||
f1e894f3 | 735 | (void)close(sock); |
7e274b4b TK |
736 | |
737 | if (result == DEFER) return DEFER; | |
8523533c TK |
738 | } |
739 | /* "fsecure" scanner type ------------------------------------------------- */ | |
740 | else if (strcmpic(scanner_name,US"fsecure") == 0) { | |
741 | uschar *fsecure_options; | |
742 | uschar fsecure_options_buffer[1024]; | |
743 | uschar fsecure_options_default[] = "/var/run/.fsav"; | |
744 | struct sockaddr_un server; | |
745 | int sock, i, j, bread = 0; | |
746 | uschar file_name[1024]; | |
747 | uschar av_buffer[1024]; | |
748 | pcre *fs_inf; | |
f7b63901 PH |
749 | static uschar *cmdoptions[] = { US"CONFIGURE\tARCHIVE\t1\n", |
750 | US"CONFIGURE\tTIMEOUT\t0\n", | |
751 | US"CONFIGURE\tMAXARCH\t5\n", | |
752 | US"CONFIGURE\tMIME\t1\n" }; | |
8e669ac1 | 753 | |
8523533c TK |
754 | malware_name = NULL; |
755 | if ((fsecure_options = string_nextinlist(&av_scanner_work, &sep, | |
756 | fsecure_options_buffer, | |
8e669ac1 | 757 | sizeof(fsecure_options_buffer))) == NULL) { |
8523533c TK |
758 | /* no options supplied, use default options */ |
759 | fsecure_options = fsecure_options_default; | |
760 | }; | |
8e669ac1 | 761 | |
8523533c TK |
762 | /* open the fsecure socket */ |
763 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
764 | if (sock < 0) { | |
765 | log_write(0, LOG_MAIN|LOG_PANIC, | |
766 | "malware acl condition: unable to open fsecure socket %s (%s)", | |
767 | fsecure_options, strerror(errno)); | |
768 | return DEFER; | |
769 | } | |
770 | server.sun_family = AF_UNIX; | |
771 | Ustrcpy(server.sun_path, fsecure_options); | |
772 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 773 | (void)close(sock); |
8523533c TK |
774 | log_write(0, LOG_MAIN|LOG_PANIC, |
775 | "malware acl condition: unable to connect to fsecure socket %s (%s)", | |
776 | fsecure_options, strerror(errno)); | |
777 | return DEFER; | |
778 | } | |
8e669ac1 | 779 | |
8544e77a PP |
780 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
781 | scanner_name, fsecure_options); | |
782 | ||
8523533c TK |
783 | /* pass options */ |
784 | memset(av_buffer, 0, sizeof(av_buffer)); | |
785 | for (i=0; i != 4; i++) { | |
786 | /* debug_printf("send option \"%s\"",cmdoptions[i]); */ | |
787 | if (write(sock, cmdoptions[i], Ustrlen(cmdoptions[i])) < 0) { | |
f1e894f3 | 788 | (void)close(sock); |
8523533c TK |
789 | log_write(0, LOG_MAIN|LOG_PANIC, |
790 | "malware acl condition: unable to write fsecure option %d to %s (%s)", | |
791 | i, fsecure_options, strerror(errno)); | |
8e669ac1 | 792 | return DEFER; |
8523533c | 793 | }; |
8e669ac1 | 794 | |
a9ccd69a | 795 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
8523533c TK |
796 | if (bread >0) av_buffer[bread]='\0'; |
797 | if (bread < 0) { | |
f1e894f3 | 798 | (void)close(sock); |
8523533c TK |
799 | log_write(0, LOG_MAIN|LOG_PANIC, |
800 | "malware acl condition: unable to read fsecure answer %d (%s)", i, strerror(errno)); | |
801 | return DEFER; | |
802 | }; | |
803 | for (j=0;j<bread;j++) if((av_buffer[j]=='\r')||(av_buffer[j]=='\n')) av_buffer[j] ='@'; | |
804 | /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */ | |
805 | /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */ | |
806 | }; | |
8e669ac1 | 807 | |
8523533c | 808 | /* pass the mailfile to fsecure */ |
8544e77a | 809 | (void)string_format(file_name,1024,"SCAN\t%s\n", eml_filename); |
8523533c TK |
810 | /* debug_printf("send scan %s",file_name); */ |
811 | if (write(sock, file_name, Ustrlen(file_name)) < 0) { | |
f1e894f3 | 812 | (void)close(sock); |
8523533c TK |
813 | log_write(0, LOG_MAIN|LOG_PANIC, |
814 | "malware acl condition: unable to write fsecure scan to %s (%s)", | |
815 | fsecure_options, strerror(errno)); | |
816 | return DEFER; | |
817 | }; | |
8e669ac1 | 818 | |
8523533c TK |
819 | /* set up match */ |
820 | /* todo also SUSPICION\t */ | |
821 | fs_inf = pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
8e669ac1 | 822 | |
8523533c TK |
823 | /* read report, linewise */ |
824 | do { | |
825 | int ovector[30]; | |
826 | i = 0; | |
827 | memset(av_buffer, 0, sizeof(av_buffer)); | |
828 | do { | |
a9ccd69a | 829 | bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT); |
8523533c | 830 | if (bread < 0) { |
f1e894f3 | 831 | (void)close(sock); |
8523533c TK |
832 | log_write(0, LOG_MAIN|LOG_PANIC, |
833 | "malware acl condition: unable to read fsecure result (%s)", strerror(errno)); | |
834 | return DEFER; | |
835 | }; | |
836 | i++; | |
837 | } | |
838 | while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n')); | |
839 | av_buffer[i-1] = '\0'; | |
840 | /* debug_printf("got line \"%s\"\n",av_buffer); */ | |
8e669ac1 | 841 | |
8523533c TK |
842 | /* Really search for virus again? */ |
843 | if (malware_name == NULL) { | |
844 | /* try matcher on the line, grab substring */ | |
845 | i = pcre_exec(fs_inf, NULL, CS av_buffer, Ustrlen(av_buffer), 0, 0, ovector, 30); | |
846 | if (i >= 2) { | |
847 | /* Got it */ | |
848 | pcre_copy_substring(CS av_buffer, ovector, i, 1, CS malware_name_buffer, 255); | |
849 | malware_name = malware_name_buffer; | |
850 | }; | |
851 | }; | |
852 | } | |
853 | while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL); | |
f1e894f3 | 854 | (void)close(sock); |
8523533c TK |
855 | } |
856 | /* ----------------------------------------------------------------------- */ | |
857 | ||
858 | /* "kavdaemon" scanner type ------------------------------------------------ */ | |
859 | else if (strcmpic(scanner_name,US"kavdaemon") == 0) { | |
860 | uschar *kav_options; | |
861 | uschar kav_options_buffer[1024]; | |
862 | uschar kav_options_default[] = "/var/run/AvpCtl"; | |
863 | struct sockaddr_un server; | |
864 | int sock; | |
865 | time_t t; | |
866 | uschar tmpbuf[1024]; | |
867 | uschar scanrequest[1024]; | |
868 | uschar kav_match_string[128]; | |
869 | int kav_rc; | |
870 | unsigned long kav_reportlen, bread; | |
871 | pcre *kav_re; | |
8544e77a PP |
872 | uschar *p; |
873 | int fits; | |
8e669ac1 | 874 | |
8523533c TK |
875 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
876 | kav_options_buffer, | |
877 | sizeof(kav_options_buffer))) == NULL) { | |
878 | /* no options supplied, use default options */ | |
879 | kav_options = kav_options_default; | |
880 | }; | |
8e669ac1 | 881 | |
8523533c TK |
882 | /* open the kavdaemon socket */ |
883 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
884 | if (sock < 0) { | |
885 | log_write(0, LOG_MAIN|LOG_PANIC, | |
886 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 887 | return DEFER; |
8523533c TK |
888 | } |
889 | server.sun_family = AF_UNIX; | |
890 | Ustrcpy(server.sun_path, kav_options); | |
891 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 892 | (void)close(sock); |
8523533c TK |
893 | log_write(0, LOG_MAIN|LOG_PANIC, |
894 | "malware acl condition: unable to connect to kavdaemon UNIX socket (%s). errno=%d", kav_options, errno); | |
895 | return DEFER; | |
896 | } | |
8e669ac1 | 897 | |
8523533c TK |
898 | /* get current date and time, build scan request */ |
899 | time(&t); | |
8544e77a PP |
900 | /* pdp note: before the eml_filename parameter, this scanned the |
901 | directory; not finding documentation, so we'll strip off the directory. | |
902 | The side-effect is that the test framework scanning may end up in | |
903 | scanning more than was requested, but for the normal interface, this is | |
904 | fine. */ | |
905 | strftime(CS tmpbuf, sizeof(tmpbuf), "<0>%d %b %H:%M:%S:%%s", localtime(&t)); | |
906 | fits = string_format(scanrequest, 1024,CS tmpbuf, eml_filename); | |
907 | if (!fits) { | |
908 | (void)close(sock); | |
909 | log_write(0, LOG_MAIN|LOG_PANIC, | |
910 | "malware filename does not fit in buffer [malware_internal() kavdaemon]"); | |
911 | } | |
73a46702 | 912 | p = Ustrrchr(scanrequest, '/'); |
8544e77a PP |
913 | if (p) |
914 | *p = '\0'; | |
915 | ||
916 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
917 | scanner_name, kav_options); | |
8e669ac1 | 918 | |
8523533c TK |
919 | /* send scan request */ |
920 | if (send(sock, scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
f1e894f3 | 921 | (void)close(sock); |
8523533c TK |
922 | log_write(0, LOG_MAIN|LOG_PANIC, |
923 | "malware acl condition: unable to write to kavdaemon UNIX socket (%s)", kav_options); | |
924 | return DEFER; | |
925 | } | |
8e669ac1 | 926 | |
8523533c TK |
927 | /* wait for result */ |
928 | if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) { | |
f1e894f3 | 929 | (void)close(sock); |
8523533c TK |
930 | log_write(0, LOG_MAIN|LOG_PANIC, |
931 | "malware acl condition: unable to read 2 bytes from kavdaemon socket."); | |
932 | return DEFER; | |
933 | } | |
8e669ac1 | 934 | |
8523533c TK |
935 | /* get errorcode from one nibble */ |
936 | if (test_byte_order() == LITTLE_MY_ENDIAN) { | |
937 | kav_rc = tmpbuf[0] & 0x0F; | |
938 | } | |
939 | else { | |
940 | kav_rc = tmpbuf[1] & 0x0F; | |
941 | }; | |
8e669ac1 | 942 | |
8523533c TK |
943 | /* improper kavdaemon configuration */ |
944 | if ( (kav_rc == 5) || (kav_rc == 6) ) { | |
f1e894f3 | 945 | (void)close(sock); |
8523533c TK |
946 | log_write(0, LOG_MAIN|LOG_PANIC, |
947 | "malware acl condition: please reconfigure kavdaemon to NOT disinfect or remove infected files."); | |
948 | return DEFER; | |
949 | }; | |
8e669ac1 | 950 | |
8523533c | 951 | if (kav_rc == 1) { |
f1e894f3 | 952 | (void)close(sock); |
8523533c TK |
953 | log_write(0, LOG_MAIN|LOG_PANIC, |
954 | "malware acl condition: kavdaemon reported 'scanning not completed' (code 1)."); | |
955 | return DEFER; | |
956 | }; | |
8e669ac1 | 957 | |
8523533c | 958 | if (kav_rc == 7) { |
f1e894f3 | 959 | (void)close(sock); |
8523533c TK |
960 | log_write(0, LOG_MAIN|LOG_PANIC, |
961 | "malware acl condition: kavdaemon reported 'kavdaemon damaged' (code 7)."); | |
962 | return DEFER; | |
963 | }; | |
8e669ac1 | 964 | |
8523533c TK |
965 | /* code 8 is not handled, since it is ambigous. It appears mostly on |
966 | bounces where part of a file has been cut off */ | |
8e669ac1 | 967 | |
8523533c TK |
968 | /* "virus found" return codes (2-4) */ |
969 | if ((kav_rc > 1) && (kav_rc < 5)) { | |
970 | int report_flag = 0; | |
8e669ac1 | 971 | |
8523533c TK |
972 | /* setup default virus name */ |
973 | Ustrcpy(malware_name_buffer,"unknown"); | |
974 | malware_name = malware_name_buffer; | |
8e669ac1 | 975 | |
8523533c TK |
976 | if (test_byte_order() == LITTLE_MY_ENDIAN) { |
977 | report_flag = tmpbuf[1]; | |
978 | } | |
979 | else { | |
980 | report_flag = tmpbuf[0]; | |
981 | }; | |
8e669ac1 | 982 | |
8523533c TK |
983 | /* read the report, if available */ |
984 | if( report_flag == 1 ) { | |
985 | /* read report size */ | |
986 | if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) { | |
f1e894f3 | 987 | (void)close(sock); |
8523533c TK |
988 | log_write(0, LOG_MAIN|LOG_PANIC, |
989 | "malware acl condition: cannot read report size from kavdaemon"); | |
990 | return DEFER; | |
991 | }; | |
8e669ac1 | 992 | |
8523533c TK |
993 | /* it's possible that avp returns av_buffer[1] == 1 but the |
994 | reportsize is 0 (!?) */ | |
995 | if (kav_reportlen > 0) { | |
996 | /* set up match regex, depends on retcode */ | |
997 | if( kav_rc == 3 ) | |
998 | Ustrcpy(kav_match_string, "suspicion:\\s*(.+?)\\s*$"); | |
999 | else | |
1000 | Ustrcpy(kav_match_string, "infected:\\s*(.+?)\\s*$"); | |
8e669ac1 | 1001 | |
8523533c TK |
1002 | kav_re = pcre_compile( CS kav_match_string, |
1003 | PCRE_COPT, | |
1004 | (const char **)&rerror, | |
1005 | &roffset, | |
1006 | NULL ); | |
8e669ac1 PH |
1007 | |
1008 | /* read report, linewise */ | |
8523533c TK |
1009 | while (kav_reportlen > 0) { |
1010 | int result = 0; | |
1011 | int ovector[30]; | |
8e669ac1 | 1012 | |
8523533c TK |
1013 | bread = 0; |
1014 | while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) { | |
1015 | kav_reportlen--; | |
1016 | if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break; | |
1017 | bread++; | |
1018 | }; | |
1019 | bread++; | |
1020 | tmpbuf[bread] = '\0'; | |
8e669ac1 | 1021 | |
8523533c TK |
1022 | /* try matcher on the line, grab substring */ |
1023 | result = pcre_exec(kav_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
1024 | if (result >= 2) { | |
1025 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS malware_name_buffer, 255); | |
1026 | break; | |
1027 | }; | |
1028 | }; | |
1029 | }; | |
1030 | }; | |
1031 | } | |
1032 | else { | |
1033 | /* no virus found */ | |
1034 | malware_name = NULL; | |
1035 | }; | |
8e669ac1 | 1036 | |
f1e894f3 | 1037 | (void)close(sock); |
8523533c TK |
1038 | } |
1039 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1040 | |
1041 | ||
8523533c TK |
1042 | /* "cmdline" scanner type ------------------------------------------------ */ |
1043 | else if (strcmpic(scanner_name,US"cmdline") == 0) { | |
1044 | uschar *cmdline_scanner; | |
1045 | uschar cmdline_scanner_buffer[1024]; | |
1046 | uschar *cmdline_trigger; | |
1047 | uschar cmdline_trigger_buffer[1024]; | |
1048 | const pcre *cmdline_trigger_re; | |
1049 | uschar *cmdline_regex; | |
1050 | uschar cmdline_regex_buffer[1024]; | |
1051 | const pcre *cmdline_regex_re; | |
1052 | uschar file_name[1024]; | |
1053 | uschar commandline[1024]; | |
1054 | void (*eximsigchld)(int); | |
1055 | void (*eximsigpipe)(int); | |
1056 | FILE *scanner_out = NULL; | |
1057 | FILE *scanner_record = NULL; | |
1058 | uschar linebuffer[32767]; | |
1059 | int trigger = 0; | |
1060 | int result; | |
1061 | int ovector[30]; | |
8544e77a PP |
1062 | uschar *p; |
1063 | BOOL fits; | |
8e669ac1 | 1064 | |
8523533c TK |
1065 | /* find scanner command line */ |
1066 | if ((cmdline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
1067 | cmdline_scanner_buffer, | |
1068 | sizeof(cmdline_scanner_buffer))) == NULL) { | |
1069 | /* no command line supplied */ | |
1070 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1071 | "malware acl condition: missing commandline specification for cmdline scanner type."); | |
8e669ac1 | 1072 | return DEFER; |
8523533c | 1073 | }; |
8e669ac1 | 1074 | |
8523533c TK |
1075 | /* find scanner output trigger */ |
1076 | if ((cmdline_trigger = string_nextinlist(&av_scanner_work, &sep, | |
1077 | cmdline_trigger_buffer, | |
1078 | sizeof(cmdline_trigger_buffer))) == NULL) { | |
1079 | /* no trigger regex supplied */ | |
1080 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1081 | "malware acl condition: missing trigger specification for cmdline scanner type."); | |
8e669ac1 | 1082 | return DEFER; |
8523533c | 1083 | }; |
8e669ac1 | 1084 | |
8523533c TK |
1085 | /* precompile trigger regex */ |
1086 | cmdline_trigger_re = pcre_compile(CS cmdline_trigger, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
1087 | if (cmdline_trigger_re == NULL) { | |
1088 | log_write(0, LOG_MAIN|LOG_PANIC, | |
81f91683 | 1089 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_trigger, rerror, roffset); |
8523533c TK |
1090 | return DEFER; |
1091 | }; | |
8e669ac1 | 1092 | |
8523533c TK |
1093 | /* find scanner name regex */ |
1094 | if ((cmdline_regex = string_nextinlist(&av_scanner_work, &sep, | |
1095 | cmdline_regex_buffer, | |
1096 | sizeof(cmdline_regex_buffer))) == NULL) { | |
1097 | /* no name regex supplied */ | |
1098 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1099 | "malware acl condition: missing virus name regex specification for cmdline scanner type."); | |
8e669ac1 | 1100 | return DEFER; |
8523533c | 1101 | }; |
8e669ac1 | 1102 | |
8523533c TK |
1103 | /* precompile name regex */ |
1104 | cmdline_regex_re = pcre_compile(CS cmdline_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
1105 | if (cmdline_regex_re == NULL) { | |
1106 | log_write(0, LOG_MAIN|LOG_PANIC, | |
81f91683 | 1107 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_regex, rerror, roffset); |
8523533c TK |
1108 | return DEFER; |
1109 | }; | |
8e669ac1 | 1110 | |
8544e77a PP |
1111 | /* prepare scanner call; despite the naming, file_name holds a directory |
1112 | name which is documented as the value given to %s. */ | |
1113 | if (Ustrlen(eml_filename) > sizeof(file_name) - 1) | |
1114 | { | |
1115 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1116 | "malware filename does not fit in buffer [malware_internal() cmdline]"); | |
1117 | return DEFER; | |
1118 | } | |
3346ab01 PP |
1119 | Ustrcpy(file_name, eml_filename); |
1120 | p = Ustrrchr(file_name, '/'); | |
8544e77a PP |
1121 | if (p) |
1122 | *p = '\0'; | |
1123 | fits = string_format(commandline, sizeof(commandline), CS cmdline_scanner, file_name); | |
1124 | if (!fits) | |
1125 | { | |
1126 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1127 | "cmdline scanner command-line does not fit in buffer"); | |
1128 | return DEFER; | |
1129 | } | |
1130 | ||
8523533c | 1131 | /* redirect STDERR too */ |
8544e77a PP |
1132 | if (Ustrlen(commandline) + 5 > sizeof(commandline)) |
1133 | { | |
1134 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1135 | "cmdline scanner command-line does not fit in buffer (STDERR redirect)"); | |
1136 | return DEFER; | |
1137 | } | |
8523533c | 1138 | Ustrcat(commandline," 2>&1"); |
8e669ac1 | 1139 | |
8544e77a PP |
1140 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline); |
1141 | ||
8523533c TK |
1142 | /* store exims signal handlers */ |
1143 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1144 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
8e669ac1 | 1145 | |
8523533c TK |
1146 | scanner_out = popen(CS commandline,"r"); |
1147 | if (scanner_out == NULL) { | |
1148 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1149 | "malware acl condition: calling cmdline scanner (%s) failed: %s.", commandline, strerror(errno)); | |
1150 | signal(SIGCHLD,eximsigchld); | |
1151 | signal(SIGPIPE,eximsigpipe); | |
1152 | return DEFER; | |
1153 | }; | |
8e669ac1 | 1154 | |
b07e6aa3 | 1155 | (void)string_format(file_name,1024,"%s/scan/%s/%s_scanner_output", spool_directory, message_id, message_id); |
2632889e | 1156 | scanner_record = modefopen(file_name,"wb",SPOOL_MODE); |
8e669ac1 | 1157 | |
8523533c TK |
1158 | if (scanner_record == NULL) { |
1159 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1160 | "malware acl condition: opening scanner output file (%s) failed: %s.", file_name, strerror(errno)); | |
1161 | pclose(scanner_out); | |
1162 | signal(SIGCHLD,eximsigchld); | |
1163 | signal(SIGPIPE,eximsigpipe); | |
1164 | return DEFER; | |
1165 | }; | |
8e669ac1 | 1166 | |
8523533c TK |
1167 | /* look for trigger while recording output */ |
1168 | while(fgets(CS linebuffer,32767,scanner_out) != NULL) { | |
1169 | if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) { | |
1170 | /* short write */ | |
1171 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1172 | "malware acl condition: short write on scanner output file (%s).", file_name); | |
1173 | pclose(scanner_out); | |
1174 | signal(SIGCHLD,eximsigchld); | |
1175 | signal(SIGPIPE,eximsigpipe); | |
1176 | return DEFER; | |
1177 | }; | |
1178 | /* try trigger match */ | |
1179 | if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1)) | |
1180 | trigger = 1; | |
1181 | }; | |
8e669ac1 | 1182 | |
f1e894f3 | 1183 | (void)fclose(scanner_record); |
8523533c TK |
1184 | pclose(scanner_out); |
1185 | signal(SIGCHLD,eximsigchld); | |
1186 | signal(SIGPIPE,eximsigpipe); | |
8e669ac1 | 1187 | |
8523533c TK |
1188 | if (trigger) { |
1189 | /* setup default virus name */ | |
1190 | Ustrcpy(malware_name_buffer,"unknown"); | |
1191 | malware_name = malware_name_buffer; | |
8e669ac1 | 1192 | |
8523533c | 1193 | /* re-open the scanner output file, look for name match */ |
c58b88df | 1194 | scanner_record = fopen(CS file_name,"rb"); |
8523533c TK |
1195 | while(fgets(CS linebuffer,32767,scanner_record) != NULL) { |
1196 | /* try match */ | |
1197 | result = pcre_exec(cmdline_regex_re, NULL, CS linebuffer, Ustrlen(linebuffer), 0, 0, ovector, 30); | |
1198 | if (result >= 2) { | |
1199 | pcre_copy_substring(CS linebuffer, ovector, result, 1, CS malware_name_buffer, 255); | |
1200 | }; | |
1201 | }; | |
f1e894f3 | 1202 | (void)fclose(scanner_record); |
8523533c TK |
1203 | } |
1204 | else { | |
1205 | /* no virus found */ | |
1206 | malware_name = NULL; | |
1207 | }; | |
1208 | } | |
1209 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1210 | |
1211 | ||
8523533c TK |
1212 | /* "sophie" scanner type ------------------------------------------------- */ |
1213 | else if (strcmpic(scanner_name,US"sophie") == 0) { | |
1214 | uschar *sophie_options; | |
1215 | uschar sophie_options_buffer[1024]; | |
1216 | uschar sophie_options_default[] = "/var/run/sophie"; | |
1217 | int bread = 0; | |
1218 | struct sockaddr_un server; | |
8544e77a PP |
1219 | int sock, len; |
1220 | uschar *p; | |
8523533c TK |
1221 | uschar file_name[1024]; |
1222 | uschar av_buffer[1024]; | |
8e669ac1 | 1223 | |
8523533c TK |
1224 | if ((sophie_options = string_nextinlist(&av_scanner_work, &sep, |
1225 | sophie_options_buffer, | |
1226 | sizeof(sophie_options_buffer))) == NULL) { | |
1227 | /* no options supplied, use default options */ | |
1228 | sophie_options = sophie_options_default; | |
1ac6b2e7 | 1229 | } |
8e669ac1 | 1230 | |
8523533c TK |
1231 | /* open the sophie socket */ |
1232 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1233 | if (sock < 0) { | |
1234 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1235 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1236 | return DEFER; |
8523533c TK |
1237 | } |
1238 | server.sun_family = AF_UNIX; | |
1239 | Ustrcpy(server.sun_path, sophie_options); | |
1240 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1241 | (void)close(sock); |
8523533c TK |
1242 | log_write(0, LOG_MAIN|LOG_PANIC, |
1243 | "malware acl condition: unable to connect to sophie UNIX socket (%s). errno=%d", sophie_options, errno); | |
1244 | return DEFER; | |
1245 | } | |
8e669ac1 | 1246 | |
8523533c | 1247 | /* pass the scan directory to sophie */ |
8544e77a PP |
1248 | len = Ustrlen(eml_filename) + 1; |
1249 | if (len > sizeof(file_name)) | |
1250 | { | |
1251 | (void)close(sock); | |
1252 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1253 | "malware filename does not fit in buffer [malware_internal() sophie]"); | |
1254 | return DEFER; | |
1255 | } | |
1256 | memcpy(file_name, eml_filename, len); | |
73a46702 | 1257 | p = Ustrrchr(file_name, '/'); |
8544e77a PP |
1258 | if (p) |
1259 | *p = '\0'; | |
1260 | ||
1261 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
1262 | scanner_name, sophie_options); | |
1263 | ||
1ac6b2e7 JH |
1264 | if ( write(sock, file_name, Ustrlen(file_name)) < 0 |
1265 | || write(sock, "\n", 1) != 1 | |
1266 | ) { | |
f1e894f3 | 1267 | (void)close(sock); |
8523533c TK |
1268 | log_write(0, LOG_MAIN|LOG_PANIC, |
1269 | "malware acl condition: unable to write to sophie UNIX socket (%s)", sophie_options); | |
8e669ac1 | 1270 | return DEFER; |
1ac6b2e7 | 1271 | } |
8e669ac1 | 1272 | |
8523533c TK |
1273 | /* wait for result */ |
1274 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1275 | if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) { |
f1e894f3 | 1276 | (void)close(sock); |
8523533c TK |
1277 | log_write(0, LOG_MAIN|LOG_PANIC, |
1278 | "malware acl condition: unable to read from sophie UNIX socket (%s)", sophie_options); | |
1279 | return DEFER; | |
1ac6b2e7 | 1280 | } |
8e669ac1 | 1281 | |
f1e894f3 | 1282 | (void)close(sock); |
8e669ac1 | 1283 | |
8523533c TK |
1284 | /* infected ? */ |
1285 | if (av_buffer[0] == '1') { | |
1286 | if (Ustrchr(av_buffer, '\n')) *Ustrchr(av_buffer, '\n') = '\0'; | |
1287 | Ustrcpy(malware_name_buffer,&av_buffer[2]); | |
1288 | malware_name = malware_name_buffer; | |
1289 | } | |
1290 | else if (!strncmp(CS av_buffer, "-1", 2)) { | |
1291 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1292 | "malware acl condition: malware acl condition: sophie reported error"); | |
1293 | return DEFER; | |
1294 | } | |
1295 | else { | |
1296 | /* all ok, no virus */ | |
1297 | malware_name = NULL; | |
1ac6b2e7 | 1298 | } |
8523533c TK |
1299 | } |
1300 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1301 | |
8523533c TK |
1302 | |
1303 | /* "clamd" scanner type ------------------------------------------------- */ | |
8544e77a PP |
1304 | /* This code was originally contributed by David Saez */ |
1305 | /* There are three scanning methods available to us: | |
1306 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1307 | * (2) Use the STREAM command, send the data on a separate port | |
1308 | * (3) Use the zINSTREAM command, send the data inline | |
1309 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1310 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1311 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
1312 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless | |
1313 | * WITH_OLD_CLAMAV_STREAM is defined. | |
1314 | * See Exim bug 926 for details. */ | |
8523533c | 1315 | else if (strcmpic(scanner_name,US"clamd") == 0) { |
599dcb77 | 1316 | uschar *clamd_options = NULL; |
8523533c TK |
1317 | uschar clamd_options_buffer[1024]; |
1318 | uschar clamd_options_default[] = "/tmp/clamd"; | |
94a18f28 | 1319 | uschar *p, *vname, *result_tag, *response_end; |
8523533c | 1320 | struct sockaddr_un server; |
f7b63901 | 1321 | int sock,bread=0; |
8e669ac1 | 1322 | unsigned int port; |
8523533c TK |
1323 | uschar file_name[1024]; |
1324 | uschar av_buffer[1024]; | |
599dcb77 | 1325 | uschar *hostname = ""; |
8523533c TK |
1326 | struct hostent *he; |
1327 | struct in_addr in; | |
2376f2f5 | 1328 | uschar *clamav_fbuf; |
73a46702 | 1329 | int clam_fd, result; |
2376f2f5 | 1330 | unsigned int fsize; |
599dcb77 TL |
1331 | BOOL use_scan_command = FALSE, fits; |
1332 | clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS]; | |
1333 | int current_server; | |
1334 | int num_servers = 0; | |
8544e77a PP |
1335 | #ifdef WITH_OLD_CLAMAV_STREAM |
1336 | uschar av_buffer2[1024]; | |
73a46702 | 1337 | int sockData; |
8544e77a PP |
1338 | #else |
1339 | uint32_t send_size, send_final_zeroblock; | |
1340 | #endif | |
8523533c TK |
1341 | |
1342 | if ((clamd_options = string_nextinlist(&av_scanner_work, &sep, | |
1343 | clamd_options_buffer, | |
1344 | sizeof(clamd_options_buffer))) == NULL) { | |
1345 | /* no options supplied, use default options */ | |
1346 | clamd_options = clamd_options_default; | |
1347 | } | |
8e669ac1 | 1348 | |
599dcb77 TL |
1349 | if (*clamd_options == '/') |
1350 | /* Local file; so we def want to use_scan_command and don't want to try | |
1351 | * passing IP/port combinations */ | |
8544e77a | 1352 | use_scan_command = TRUE; |
599dcb77 TL |
1353 | else { |
1354 | uschar *address = clamd_options; | |
1355 | uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20]; | |
1356 | ||
1357 | /* Go through the rest of the list of host/port and construct an array | |
1358 | * of servers to try. The first one is the bit we just passed from | |
1359 | * clamd_options so process that first and then scan the remainder of | |
1360 | * the address buffer */ | |
1361 | do { | |
1362 | clamd_address_container *this_clamd; | |
1363 | ||
1364 | /* The 'local' option means use the SCAN command over the network | |
1365 | * socket (ie common file storage in use) */ | |
1366 | if (strcmpic(address,US"local") == 0) { | |
1367 | use_scan_command = TRUE; | |
1368 | continue; | |
1369 | } | |
1370 | ||
1371 | /* XXX: If unsuccessful we should free this memory */ | |
1372 | this_clamd = | |
1373 | (clamd_address_container *)store_get(sizeof(clamd_address_container)); | |
1374 | ||
1375 | /* extract host and port part */ | |
1376 | if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u", this_clamd->tcp_addr, | |
1377 | &(this_clamd->tcp_port)) != 2 ) { | |
1378 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1379 | "malware acl condition: clamd: invalid address '%s'", address); | |
1380 | continue; | |
1381 | } | |
1382 | ||
1383 | clamd_address_vector[num_servers] = this_clamd; | |
1384 | num_servers++; | |
1385 | if (num_servers >= MAX_CLAMD_SERVERS) { | |
1386 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1387 | "More than " MAX_CLAMD_SERVERS_S " clamd servers specified; " | |
1388 | "only using the first " MAX_CLAMD_SERVERS_S ); | |
1389 | break; | |
1390 | } | |
1391 | } while ((address = string_nextinlist(&av_scanner_work, &sep, | |
1392 | address_buffer, | |
1393 | sizeof(address_buffer))) != NULL); | |
1394 | ||
1395 | /* check if we have at least one server */ | |
1396 | if (!num_servers) { | |
1397 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1398 | "malware acl condition: clamd: no useable clamd server addresses in malware configuration option."); | |
1399 | return DEFER; | |
1400 | } | |
1401 | } | |
8544e77a | 1402 | |
94a18f28 PP |
1403 | /* See the discussion of response formats below to see why we really don't |
1404 | like colons in filenames when passing filenames to ClamAV. */ | |
1405 | if (use_scan_command && Ustrchr(eml_filename, ':')) { | |
1406 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1407 | "malware acl condition: clamd: local/SCAN mode incompatible with" \ | |
1408 | " : in path to email filename [%s]", eml_filename); | |
1409 | return DEFER; | |
1410 | } | |
1411 | ||
599dcb77 TL |
1412 | /* We have some network servers specified */ |
1413 | if (num_servers) { | |
8e669ac1 | 1414 | |
8544e77a PP |
1415 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd |
1416 | * only supports AF_INET, but we should probably be looking to the | |
1417 | * future and rewriting this to be protocol-independent anyway. */ | |
1418 | ||
599dcb77 TL |
1419 | while ( num_servers > 0 ) { |
1420 | /* Randomly pick a server to start with */ | |
1421 | current_server = random_number( num_servers ); | |
8e669ac1 | 1422 | |
599dcb77 TL |
1423 | debug_printf("trying server name %s, port %u\n", |
1424 | clamd_address_vector[current_server]->tcp_addr, | |
1425 | clamd_address_vector[current_server]->tcp_port); | |
8e669ac1 | 1426 | |
599dcb77 TL |
1427 | /* Lookup the host. This is to ensure that we connect to the same IP |
1428 | * on both connections (as one host could resolve to multiple ips) */ | |
1429 | if((he = gethostbyname(CS clamd_address_vector[current_server]->tcp_addr)) | |
1430 | == 0) { | |
1431 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1432 | "malware acl condition: clamd: failed to lookup host '%s'", | |
1433 | clamd_address_vector[current_server]->tcp_addr | |
1434 | ); | |
1435 | goto try_next_server; | |
1436 | } | |
8e669ac1 | 1437 | |
599dcb77 | 1438 | in = *(struct in_addr *) he->h_addr_list[0]; |
8e669ac1 | 1439 | |
599dcb77 TL |
1440 | /* Open the ClamAV Socket */ |
1441 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
1442 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1443 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1444 | strerror(errno)); | |
1445 | goto try_next_server; | |
1446 | } | |
1447 | ||
1448 | if (ip_connect( sock, | |
1449 | AF_INET, | |
1450 | (uschar*)inet_ntoa(in), | |
1451 | clamd_address_vector[current_server]->tcp_port, | |
1452 | 5 ) > -1) { | |
1453 | /* Connection successfully established with a server */ | |
1454 | hostname = clamd_address_vector[current_server]->tcp_addr; | |
1455 | break; | |
1456 | } else { | |
1457 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1458 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1459 | clamd_address_vector[current_server]->tcp_addr, | |
1460 | clamd_address_vector[current_server]->tcp_port, | |
1461 | strerror(errno)); | |
1462 | ||
1463 | (void)close(sock); | |
1464 | } | |
1465 | ||
1466 | try_next_server: | |
1467 | /* Remove the server from the list. XXX We should free the memory */ | |
1468 | num_servers--; | |
1469 | int i; | |
1470 | for( i = current_server; i < num_servers; i++ ) | |
1471 | clamd_address_vector[i] = clamd_address_vector[i+1]; | |
8523533c | 1472 | } |
2376f2f5 | 1473 | |
599dcb77 TL |
1474 | if ( num_servers == 0 ) { |
1475 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: all clamd servers failed"); | |
1476 | return DEFER; | |
1477 | } | |
8544e77a PP |
1478 | } else { |
1479 | /* open the local socket */ | |
1480 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
1481 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1482 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1483 | strerror(errno)); | |
1484 | return DEFER; | |
1485 | } | |
2376f2f5 | 1486 | |
8544e77a PP |
1487 | server.sun_family = AF_UNIX; |
1488 | Ustrcpy(server.sun_path, clamd_options); | |
8e669ac1 | 1489 | |
8544e77a PP |
1490 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { |
1491 | (void)close(sock); | |
1492 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1493 | "malware acl condition: clamd: unable to connect to UNIX socket %s (%s)", | |
1494 | clamd_options, strerror(errno) ); | |
1495 | return DEFER; | |
1496 | } | |
1497 | } | |
8e669ac1 | 1498 | |
8544e77a PP |
1499 | /* have socket in variable "sock"; command to use is semi-independent of |
1500 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1501 | * domain socket, or explicitly told local) else we stream the data. | |
1502 | * How we stream the data depends upon how we were built. */ | |
2376f2f5 | 1503 | |
8544e77a | 1504 | if (!use_scan_command) { |
2376f2f5 | 1505 | |
8544e77a PP |
1506 | #ifdef WITH_OLD_CLAMAV_STREAM |
1507 | /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to | |
1508 | * that port on a second connection; then in the scan-method-neutral | |
1509 | * part, read the response back on the original connection. */ | |
2376f2f5 | 1510 | |
8544e77a PP |
1511 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n", |
1512 | scanner_name); | |
8e669ac1 | 1513 | |
8544e77a PP |
1514 | /* Pass the string to ClamAV (7 = "STREAM\n") */ |
1515 | if (send(sock, "STREAM\n", 7, 0) < 0) { | |
1516 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", | |
1517 | strerror(errno)); | |
1518 | (void)close(sock); | |
1519 | return DEFER; | |
1520 | } | |
1521 | memset(av_buffer2, 0, sizeof(av_buffer2)); | |
1522 | bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT); | |
8e669ac1 | 1523 | |
8544e77a PP |
1524 | if (bread < 0) { |
1525 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1526 | "malware acl condition: clamd: unable to read PORT from socket (%s)", | |
1527 | strerror(errno)); | |
1528 | (void)close(sock); | |
1529 | return DEFER; | |
1530 | } | |
8e669ac1 | 1531 | |
8544e77a PP |
1532 | if (bread == sizeof(av_buffer)) { |
1533 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1534 | "malware acl condition: clamd: buffer too small"); | |
1535 | (void)close(sock); | |
1536 | return DEFER; | |
1537 | } | |
8e669ac1 | 1538 | |
8544e77a PP |
1539 | if (!(*av_buffer2)) { |
1540 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1541 | "malware acl condition: clamd: ClamAV returned null"); | |
1542 | (void)close(sock); | |
1543 | return DEFER; | |
1544 | } | |
8e669ac1 | 1545 | |
8544e77a PP |
1546 | av_buffer2[bread] = '\0'; |
1547 | if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) { | |
1548 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1549 | "malware acl condition: clamd: Expected port information from clamd, got '%s'", av_buffer2); | |
1550 | (void)close(sock); | |
1551 | return DEFER; | |
1552 | }; | |
2376f2f5 | 1553 | |
8544e77a PP |
1554 | if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) { |
1555 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1556 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1557 | strerror(errno)); | |
1558 | (void)close(sock); | |
1559 | return DEFER; | |
1560 | } | |
384152a6 | 1561 | |
8544e77a PP |
1562 | if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { |
1563 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1564 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1565 | inet_ntoa(in), port, strerror(errno)); | |
1566 | (void)close(sockData); (void)close(sock); | |
1567 | return DEFER; | |
1568 | } | |
384152a6 | 1569 | |
8544e77a PP |
1570 | #define CLOSE_SOCKDATA (void)close(sockData) |
1571 | #else /* WITH_OLD_CLAMAV_STREAM not defined */ | |
1572 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> | |
1573 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1574 | chunk. */ | |
384152a6 | 1575 | |
8544e77a PP |
1576 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", |
1577 | scanner_name); | |
384152a6 | 1578 | |
8544e77a PP |
1579 | /* Pass the string to ClamAV (10 = "zINSTREAM\0") */ |
1580 | if (send(sock, "zINSTREAM", 10, 0) < 0) { | |
8523533c | 1581 | log_write(0, LOG_MAIN|LOG_PANIC, |
8544e77a PP |
1582 | "malware acl condition: clamd: unable to send zINSTREAM to socket (%s)", |
1583 | strerror(errno)); | |
1584 | (void)close(sock); | |
8523533c TK |
1585 | return DEFER; |
1586 | } | |
8e669ac1 | 1587 | |
8544e77a PP |
1588 | #define CLOSE_SOCKDATA /**/ |
1589 | #endif | |
8e669ac1 | 1590 | |
8544e77a PP |
1591 | /* calc file size */ |
1592 | clam_fd = open(CS eml_filename, O_RDONLY); | |
1593 | if (clam_fd == -1) { | |
8523533c | 1594 | log_write(0, LOG_MAIN|LOG_PANIC, |
8544e77a PP |
1595 | "malware acl condition: clamd: can't open spool file %s: %s", |
1596 | eml_filename, strerror(errno)); | |
1597 | CLOSE_SOCKDATA; (void)close(sock); | |
8523533c TK |
1598 | return DEFER; |
1599 | } | |
8544e77a PP |
1600 | fsize = lseek(clam_fd, 0, SEEK_END); |
1601 | if (fsize == -1) { | |
1602 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1603 | "malware acl condition: clamd: can't seek spool file %s: %s", | |
1604 | eml_filename, strerror(errno)); | |
1605 | CLOSE_SOCKDATA; (void)close(sock); | |
1606 | return DEFER; | |
1607 | } | |
1608 | lseek(clam_fd, 0, SEEK_SET); | |
8e669ac1 | 1609 | |
8544e77a PP |
1610 | clamav_fbuf = (uschar *) malloc (fsize); |
1611 | if (!clamav_fbuf) { | |
1612 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1613 | "malware acl condition: clamd: unable to allocate memory %u for file (%s)", | |
1614 | fsize, eml_filename); | |
1615 | CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd); | |
1616 | return DEFER; | |
1617 | } | |
8e669ac1 | 1618 | |
8544e77a PP |
1619 | result = read (clam_fd, clamav_fbuf, fsize); |
1620 | if (result == -1) { | |
1621 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1622 | "malware acl condition: clamd: can't read spool file %s: %s", | |
1623 | eml_filename, strerror(errno)); | |
1624 | CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd); | |
1625 | free(clamav_fbuf); | |
1626 | return DEFER; | |
1627 | } | |
1628 | (void)close(clam_fd); | |
8e669ac1 | 1629 | |
8544e77a PP |
1630 | /* send file body to socket */ |
1631 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1632 | if (send(sockData, clamav_fbuf, fsize, 0) < 0) { | |
1633 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1634 | "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port); | |
1635 | CLOSE_SOCKDATA; (void)close(sock); | |
1636 | free(clamav_fbuf); | |
1637 | return DEFER; | |
1638 | } | |
1639 | #else | |
1640 | send_size = htonl(fsize); | |
1641 | send_final_zeroblock = 0; | |
1642 | if ((send(sock, &send_size, sizeof(send_size), 0) < 0) || | |
1643 | (send(sock, clamav_fbuf, fsize, 0) < 0) || | |
1644 | (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
1645 | { | |
1646 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1647 | "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port); | |
1648 | (void)close(sock); | |
1649 | free(clamav_fbuf); | |
1650 | return DEFER; | |
1651 | } | |
1652 | #endif | |
8e669ac1 | 1653 | |
8544e77a PP |
1654 | free(clamav_fbuf); |
1655 | ||
1656 | CLOSE_SOCKDATA; | |
1657 | #undef CLOSE_SOCKDATA | |
1658 | ||
1659 | } else { /* use scan command */ | |
1660 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1661 | * scan-method-neutral part, read the response back */ | |
1662 | ||
1663 | /* ================================================================= */ | |
1664 | ||
1665 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1666 | which dates to when ClamAV needed us to break apart the email into the | |
1667 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1668 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1669 | doing this would actually have resulted in the mail attachments being | |
1670 | scanned twice, in the broken out files and from the original .eml. | |
1671 | Since ClamAV now handles emails (and has for quite some time) we can | |
1672 | just use the email file itself. */ | |
1673 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ | |
1674 | fits = string_format(file_name, sizeof(file_name), "SCAN %s\n", | |
1675 | eml_filename); | |
1676 | if (!fits) { | |
1677 | (void)close(sock); | |
1678 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1679 | "malware filename does not fit in buffer [malware_internal() clamd]"); | |
1680 | } | |
8e669ac1 | 1681 | |
8544e77a PP |
1682 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n", |
1683 | scanner_name, clamd_options); | |
8e669ac1 | 1684 | |
8544e77a PP |
1685 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) { |
1686 | (void)close(sock); | |
1687 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", | |
1688 | strerror(errno)); | |
1689 | return DEFER; | |
1690 | } | |
8e669ac1 | 1691 | |
8544e77a PP |
1692 | /* Do not shut down the socket for writing; a user report noted that |
1693 | * clamd 0.70 does not react well to this. */ | |
1694 | } | |
1695 | /* Commands have been sent, no matter which scan method or connection | |
1696 | * type we're using; now just read the result, independent of method. */ | |
8e669ac1 | 1697 | |
8523533c TK |
1698 | /* Read the result */ |
1699 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1700 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
f1e894f3 | 1701 | (void)close(sock); |
8523533c TK |
1702 | |
1703 | if (!(bread > 0)) { | |
1704 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1705 | "malware acl condition: clamd: unable to read from socket (%s)", | |
1706 | strerror(errno)); | |
1707 | return DEFER; | |
1708 | } | |
8e669ac1 | 1709 | |
8523533c TK |
1710 | if (bread == sizeof(av_buffer)) { |
1711 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1712 | "malware acl condition: clamd: buffer too small"); | |
1713 | return DEFER; | |
1714 | } | |
8e669ac1 | 1715 | |
94a18f28 PP |
1716 | /* Check the result. ClamAV returns one of two result formats. |
1717 | In the basic mode, the response is of the form: | |
1718 | infected: -> "<filename>: <virusname> FOUND" | |
1719 | not-infected: -> "<filename>: OK" | |
1720 | error: -> "<filename>: <errcode> ERROR | |
1721 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1722 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1723 | for the infected case. Compare: | |
1724 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1725 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1726 | ||
1727 | In the streaming case, clamd uses the filename "stream" which you should | |
1728 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1729 | client app will replace "stream" with the original filename before returning | |
1730 | results to stdout, but the trace shows the data). | |
1731 | ||
1732 | We will assume that the pathname passed to clamd from Exim does not contain | |
1733 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1734 | passing a filename to clamd). */ | |
8e669ac1 | 1735 | |
8523533c TK |
1736 | if (!(*av_buffer)) { |
1737 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1738 | "malware acl condition: clamd: ClamAV returned null"); | |
1739 | return DEFER; | |
1740 | } | |
8e669ac1 | 1741 | |
94a18f28 PP |
1742 | /* strip newline at the end (won't be present for zINSTREAM) |
1743 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1744 | this below, so double-check) */ | |
3c5cd616 | 1745 | p = av_buffer + Ustrlen(av_buffer) - 1; |
94a18f28 | 1746 | if (*p == '\n') *p = '\0'; |
3c5cd616 | 1747 | |
8544e77a PP |
1748 | DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer); |
1749 | ||
94a18f28 PP |
1750 | while (isspace(*--p) && (p > av_buffer)) |
1751 | *p = '\0'; | |
1752 | if (*p) ++p; | |
1753 | response_end = p; | |
1754 | ||
8523533c | 1755 | /* colon in returned output? */ |
94a18f28 | 1756 | if((p = Ustrchr(av_buffer,':')) == NULL) { |
8523533c | 1757 | log_write(0, LOG_MAIN|LOG_PANIC, |
94a18f28 | 1758 | "malware acl condition: clamd: ClamAV returned malformed result (missing colon): %s", |
8e669ac1 | 1759 | av_buffer); |
8523533c TK |
1760 | return DEFER; |
1761 | } | |
8e669ac1 | 1762 | |
3c5cd616 | 1763 | /* strip filename */ |
94a18f28 | 1764 | while (*p && isspace(*++p)) /**/; |
8523533c | 1765 | vname = p; |
94a18f28 PP |
1766 | |
1767 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1768 | but we should at least be resistant to it. */ | |
1769 | p = Ustrrchr(vname, ' '); | |
1770 | if (p) | |
1771 | result_tag = p + 1; | |
1772 | else | |
1773 | result_tag = vname; | |
1774 | ||
1775 | if (Ustrcmp(result_tag, "FOUND") == 0) { | |
1776 | /* p should still be the whitespace before the result_tag */ | |
1777 | while (isspace(*p)) --p; | |
1778 | *++p = '\0'; | |
1779 | /* Strip off the extended information too, which will be in parens | |
1780 | after the virus name, with no intervening whitespace. */ | |
1781 | if (*--p == ')') { | |
1782 | /* "(hash:size)", so previous '(' will do; if not found, we have | |
1783 | a curious virus name, but not an error. */ | |
1784 | p = Ustrrchr(vname, '('); | |
1785 | if (p) | |
1786 | *p = '\0'; | |
1787 | } | |
1788 | Ustrncpy(malware_name_buffer, vname, sizeof(malware_name_buffer)-1); | |
1789 | malware_name = malware_name_buffer; | |
1790 | DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name); | |
1791 | ||
1792 | } else if (Ustrcmp(result_tag, "ERROR") == 0) { | |
1793 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1794 | "malware acl condition: clamd: ClamAV returned: %s", | |
1795 | av_buffer); | |
1796 | return DEFER; | |
1797 | ||
1798 | } else if (Ustrcmp(result_tag, "OK") == 0) { | |
1799 | /* Everything should be OK */ | |
1800 | malware_name = NULL; | |
1801 | DEBUG(D_acl) debug_printf("Malware not found\n"); | |
1802 | ||
1803 | } else { | |
1804 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1805 | "malware acl condition: clamd: unparseable response from ClamAV: {%s}", | |
1806 | av_buffer); | |
1807 | return DEFER; | |
8523533c | 1808 | } |
94a18f28 PP |
1809 | |
1810 | } /* clamd */ | |
1811 | ||
8523533c | 1812 | /* ----------------------------------------------------------------------- */ |
8e669ac1 PH |
1813 | |
1814 | ||
8523533c TK |
1815 | /* "mksd" scanner type --------------------------------------------------- */ |
1816 | else if (strcmpic(scanner_name,US"mksd") == 0) { | |
1817 | uschar *mksd_options; | |
1818 | char *mksd_options_end; | |
1819 | uschar mksd_options_buffer[32]; | |
1820 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1821 | struct sockaddr_un server; | |
1822 | int sock; | |
1823 | int retval; | |
8e669ac1 | 1824 | |
8523533c TK |
1825 | if ((mksd_options = string_nextinlist(&av_scanner_work, &sep, |
1826 | mksd_options_buffer, | |
1827 | sizeof(mksd_options_buffer))) != NULL) { | |
1828 | mksd_maxproc = (int) strtol(CS mksd_options, &mksd_options_end, 10); | |
384152a6 TK |
1829 | if ((*mksd_options == '\0') || (*mksd_options_end != '\0') || |
1830 | (mksd_maxproc < 1) || (mksd_maxproc > 32)) { | |
8523533c TK |
1831 | log_write(0, LOG_MAIN|LOG_PANIC, |
1832 | "malware acl condition: mksd: invalid option '%s'", mksd_options); | |
1833 | return DEFER; | |
1834 | } | |
1835 | } | |
8e669ac1 | 1836 | |
8523533c TK |
1837 | /* open the mksd socket */ |
1838 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1839 | if (sock < 0) { | |
1840 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1841 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1842 | return DEFER; |
8523533c TK |
1843 | } |
1844 | server.sun_family = AF_UNIX; | |
1845 | Ustrcpy(server.sun_path, "/var/run/mksd/socket"); | |
1846 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1847 | (void)close(sock); |
8523533c TK |
1848 | log_write(0, LOG_MAIN|LOG_PANIC, |
1849 | "malware acl condition: unable to connect to mksd UNIX socket (/var/run/mksd/socket). errno=%d", errno); | |
1850 | return DEFER; | |
1851 | } | |
8e669ac1 | 1852 | |
8523533c | 1853 | malware_name = NULL; |
8e669ac1 | 1854 | |
8544e77a PP |
1855 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name); |
1856 | ||
1857 | retval = mksd_scan_packed(sock, eml_filename); | |
8e669ac1 | 1858 | |
8523533c TK |
1859 | if (retval != OK) |
1860 | return retval; | |
1861 | } | |
1862 | /* ----------------------------------------------------------------------- */ | |
1863 | ||
1864 | /* "unknown" scanner type ------------------------------------------------- */ | |
1865 | else { | |
1866 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1867 | "malware condition: unknown scanner type '%s'", scanner_name); | |
1868 | return DEFER; | |
1869 | }; | |
1870 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1871 | |
8523533c TK |
1872 | /* set "been here, done that" marker */ |
1873 | malware_ok = 1; | |
1874 | }; | |
1875 | ||
1876 | /* match virus name against pattern (caseless ------->----------v) */ | |
1877 | if ( (malware_name != NULL) && | |
1878 | (regex_match_and_setup(re, malware_name, 0, -1)) ) { | |
8544e77a | 1879 | DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name); |
8523533c TK |
1880 | return OK; |
1881 | } | |
1882 | else { | |
1883 | return FAIL; | |
1884 | }; | |
1885 | } | |
1886 | ||
1887 | ||
1888 | /* simple wrapper for reading lines from sockets */ | |
1889 | int recv_line(int sock, uschar *buffer, int size) { | |
1890 | uschar *p = buffer; | |
1891 | ||
1892 | memset(buffer,0,size); | |
1893 | /* read until \n */ | |
1894 | while(recv(sock,p,1,0) > -1) { | |
1895 | if ((p-buffer) > (size-2)) break; | |
1896 | if (*p == '\n') break; | |
1897 | if (*p != '\r') p++; | |
1898 | }; | |
1899 | *p = '\0'; | |
1900 | ||
1901 | return (p-buffer); | |
1902 | } | |
1903 | ||
1904 | ||
1905 | /* ============= private routines for the "mksd" scanner type ============== */ | |
1906 | ||
1907 | #include <sys/uio.h> | |
1908 | ||
8544e77a | 1909 | static int mksd_writev (int sock, struct iovec *iov, int iovcnt) |
8523533c TK |
1910 | { |
1911 | int i; | |
8e669ac1 | 1912 | |
8523533c TK |
1913 | for (;;) { |
1914 | do | |
1915 | i = writev (sock, iov, iovcnt); | |
1916 | while ((i < 0) && (errno == EINTR)); | |
1917 | if (i <= 0) { | |
1918 | close (sock); | |
1919 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1920 | "malware acl condition: unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
1921 | return -1; | |
1922 | } | |
8e669ac1 | 1923 | |
8523533c TK |
1924 | for (;;) |
1925 | if (i >= iov->iov_len) { | |
1926 | if (--iovcnt == 0) | |
1927 | return 0; | |
1928 | i -= iov->iov_len; | |
1929 | iov++; | |
1930 | } else { | |
1931 | iov->iov_len -= i; | |
1932 | iov->iov_base = CS iov->iov_base + i; | |
1933 | break; | |
1934 | } | |
1935 | } | |
1936 | } | |
1937 | ||
8544e77a | 1938 | static int mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size) |
8523533c TK |
1939 | { |
1940 | int offset = 0; | |
1941 | int i; | |
8e669ac1 | 1942 | |
8523533c TK |
1943 | do { |
1944 | if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) { | |
1945 | close (sock); | |
1946 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1947 | "malware acl condition: unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
1948 | return -1; | |
1949 | } | |
8e669ac1 | 1950 | |
8523533c TK |
1951 | offset += i; |
1952 | /* offset == av_buffer_size -> buffer full */ | |
1953 | if (offset == av_buffer_size) { | |
1954 | close (sock); | |
1955 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1956 | "malware acl condition: malformed reply received from mksd"); | |
1957 | return -1; | |
1958 | } | |
1959 | } while (av_buffer[offset-1] != '\n'); | |
8e669ac1 | 1960 | |
8523533c TK |
1961 | av_buffer[offset] = '\0'; |
1962 | return offset; | |
1963 | } | |
1964 | ||
8544e77a | 1965 | static int mksd_parse_line (char *line) |
8523533c TK |
1966 | { |
1967 | char *p; | |
8e669ac1 | 1968 | |
8523533c TK |
1969 | switch (*line) { |
1970 | case 'O': | |
1971 | /* OK */ | |
1972 | return OK; | |
1973 | case 'E': | |
1974 | case 'A': | |
1975 | /* ERR */ | |
1976 | if ((p = strchr (line, '\n')) != NULL) | |
1977 | (*p) = '\0'; | |
1978 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1979 | "malware acl condition: mksd scanner failed: %s", line); | |
1980 | return DEFER; | |
1981 | default: | |
1982 | /* VIR */ | |
1983 | if ((p = strchr (line, '\n')) != NULL) { | |
1984 | (*p) = '\0'; | |
1985 | if (((p-line) > 5) && ((p-line) < sizeof (malware_name_buffer)) && (line[3] == ' ')) | |
1986 | if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) { | |
1987 | (*p) = '\0'; | |
1988 | Ustrcpy (malware_name_buffer, line+4); | |
384152a6 | 1989 | malware_name = malware_name_buffer; |
8523533c TK |
1990 | return OK; |
1991 | } | |
1992 | } | |
1993 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1994 | "malware acl condition: malformed reply received from mksd: %s", line); | |
1995 | return DEFER; | |
1996 | } | |
1997 | } | |
1998 | ||
8544e77a | 1999 | static int mksd_scan_packed(int sock, uschar *scan_filename) |
8523533c | 2000 | { |
8544e77a | 2001 | struct iovec iov[3]; |
1ba28e2b | 2002 | const char *cmd = "MSQ\n"; |
8523533c | 2003 | uschar av_buffer[1024]; |
8e669ac1 | 2004 | |
1ba28e2b | 2005 | iov[0].iov_base = (void *) cmd; |
8523533c | 2006 | iov[0].iov_len = 3; |
8544e77a PP |
2007 | iov[1].iov_base = CS scan_filename; |
2008 | iov[1].iov_len = Ustrlen(scan_filename); | |
f1a29782 | 2009 | iov[2].iov_base = (void *) (cmd + 3); |
8544e77a PP |
2010 | iov[2].iov_len = 1; |
2011 | ||
2012 | if (mksd_writev (sock, iov, 3) < 0) | |
8523533c | 2013 | return DEFER; |
8e669ac1 | 2014 | |
8523533c TK |
2015 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0) |
2016 | return DEFER; | |
8e669ac1 | 2017 | |
8523533c | 2018 | close (sock); |
8e669ac1 | 2019 | |
8523533c TK |
2020 | return mksd_parse_line (CS av_buffer); |
2021 | } | |
2022 | ||
2023 | #endif |