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 | ||
13 | /* declaration of private routines */ | |
8544e77a PP |
14 | static int mksd_scan_packed(int sock, uschar *scan_filename); |
15 | static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking); | |
8523533c TK |
16 | |
17 | /* SHUT_WR seems to be undefined on Unixware? */ | |
18 | #ifndef SHUT_WR | |
19 | #define SHUT_WR 1 | |
20 | #endif | |
21 | ||
a9ccd69a PH |
22 | |
23 | #define MALWARE_TIMEOUT 120 | |
24 | ||
25 | ||
8523533c TK |
26 | #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ |
27 | #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
28 | #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
29 | ||
2376f2f5 TK |
30 | #define DERR_READ_ERR (1<<0) /* read error */ |
31 | #define DERR_NOMEMORY (1<<2) /* no memory */ | |
32 | #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
33 | #define DERR_BAD_CALL (1<<15) /* wrong command */ | |
34 | ||
8e669ac1 | 35 | /* Routine to check whether a system is big- or litte-endian. |
8523533c TK |
36 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
37 | Needed for proper kavdaemon implementation. Sigh. */ | |
38 | #define BIG_MY_ENDIAN 0 | |
39 | #define LITTLE_MY_ENDIAN 1 | |
40 | int test_byte_order(void); | |
41 | int test_byte_order() { | |
42 | short int word = 0x0001; | |
43 | char *byte = (char *) &word; | |
44 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); | |
45 | } | |
46 | ||
47 | uschar malware_name_buffer[256]; | |
48 | int malware_ok = 0; | |
49 | ||
8544e77a PP |
50 | /* Gross hacks for the -bmalware option; perhaps we should just create |
51 | the scan directory normally for that case, but look into rigging up the | |
52 | needed header variables if not already set on the command-line? */ | |
53 | extern int spool_mbox_ok; | |
54 | extern uschar spooled_message_id[17]; | |
55 | ||
56 | /************************************************* | |
57 | * Scan an email for malware * | |
58 | *************************************************/ | |
59 | ||
60 | /* This is the normal interface for scanning an email, which doesn't need a | |
61 | filename; it's a wrapper around the malware_file function. | |
62 | ||
63 | Arguments: | |
64 | listptr the list of options to the "malware = ..." ACL condition | |
65 | ||
66 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
67 | where true means malware was found (condition applies) | |
68 | */ | |
8523533c | 69 | int malware(uschar **listptr) { |
8544e77a PP |
70 | uschar scan_filename[1024]; |
71 | BOOL fits; | |
9e949f00 | 72 | int ret; |
8544e77a PP |
73 | |
74 | fits = string_format(scan_filename, sizeof(scan_filename), | |
75 | CS"%s/scan/%s/%s.eml", spool_directory, message_id, message_id); | |
76 | if (!fits) | |
77 | { | |
9e949f00 | 78 | av_failed = TRUE; |
8544e77a PP |
79 | log_write(0, LOG_MAIN|LOG_PANIC, |
80 | "malware filename does not fit in buffer [malware()]"); | |
81 | return DEFER; | |
82 | } | |
83 | ||
9e949f00 PP |
84 | ret = malware_internal(listptr, scan_filename, FALSE); |
85 | if (ret == DEFER) av_failed = TRUE; | |
86 | ||
87 | return ret; | |
8544e77a PP |
88 | } |
89 | ||
90 | ||
91 | /************************************************* | |
92 | * Scan a file for malware * | |
93 | *************************************************/ | |
94 | ||
95 | /* This is a test wrapper for scanning an email, which is not used in | |
96 | normal processing. Scan any file, using the Exim scanning interface. | |
97 | This function tampers with various global variables so is unsafe to use | |
98 | in any other context. | |
99 | ||
100 | Arguments: | |
101 | eml_filename a file holding the message to be scanned | |
102 | ||
103 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
104 | where true means malware was found (condition applies) | |
105 | */ | |
dbc4b90d PP |
106 | int |
107 | malware_in_file(uschar *eml_filename) { | |
8544e77a PP |
108 | uschar *scan_options[2]; |
109 | uschar message_id_buf[64]; | |
110 | int ret; | |
111 | ||
73a46702 | 112 | scan_options[0] = US"*"; |
8544e77a PP |
113 | scan_options[1] = NULL; |
114 | ||
115 | /* spool_mbox() assumes various parameters exist, when creating | |
116 | the relevant directory and the email within */ | |
117 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
73a46702 | 118 | "dummy-%d", pseudo_random_number(INT_MAX)); |
8544e77a | 119 | message_id = message_id_buf; |
73a46702 PP |
120 | sender_address = US"malware-sender@example.net"; |
121 | return_path = US""; | |
8544e77a | 122 | recipients_list = NULL; |
73a46702 | 123 | receive_add_recipient(US"malware-victim@example.net", -1); |
8544e77a PP |
124 | enable_dollar_recipients = TRUE; |
125 | ||
126 | ret = malware_internal(scan_options, eml_filename, TRUE); | |
127 | ||
73a46702 | 128 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
8544e77a PP |
129 | spool_mbox_ok = 1; |
130 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
131 | set, but if that changes, then it should apply to these tests too */ | |
132 | unspool_mbox(); | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | ||
138 | /************************************************* | |
139 | * Scan content for malware * | |
140 | *************************************************/ | |
141 | ||
142 | /* This is an internal interface for scanning an email; the normal interface | |
143 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
144 | ||
145 | Arguments: | |
146 | listptr the list of options to the "malware = ..." ACL condition | |
147 | eml_filename the file holding the email to be scanned | |
148 | faking whether or not we're faking this up for the -bmalware test | |
149 | ||
150 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
151 | where true means malware was found (condition applies) | |
152 | */ | |
153 | static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking) { | |
8523533c TK |
154 | int sep = 0; |
155 | uschar *list = *listptr; | |
156 | uschar *av_scanner_work = av_scanner; | |
157 | uschar *scanner_name; | |
158 | uschar scanner_name_buffer[16]; | |
159 | uschar *malware_regex; | |
160 | uschar malware_regex_buffer[64]; | |
161 | uschar malware_regex_default[] = ".+"; | |
f7b63901 | 162 | unsigned long mbox_size; |
8523533c TK |
163 | FILE *mbox_file; |
164 | int roffset; | |
165 | const pcre *re; | |
166 | const uschar *rerror; | |
8e669ac1 | 167 | |
8523533c | 168 | /* make sure the eml mbox file is spooled up */ |
8544e77a | 169 | mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL); |
8523533c TK |
170 | if (mbox_file == NULL) { |
171 | /* error while spooling */ | |
172 | log_write(0, LOG_MAIN|LOG_PANIC, | |
173 | "malware acl condition: error while creating mbox spool file"); | |
8e669ac1 | 174 | return DEFER; |
8523533c TK |
175 | }; |
176 | /* none of our current scanners need the mbox | |
177 | file as a stream, so we can close it right away */ | |
f1e894f3 | 178 | (void)fclose(mbox_file); |
8e669ac1 | 179 | |
8523533c TK |
180 | /* extract the malware regex to match against from the option list */ |
181 | if ((malware_regex = string_nextinlist(&list, &sep, | |
182 | malware_regex_buffer, | |
183 | sizeof(malware_regex_buffer))) != NULL) { | |
8e669ac1 | 184 | |
8523533c | 185 | /* parse 1st option */ |
8e669ac1 | 186 | if ( (strcmpic(malware_regex,US"false") == 0) || |
8523533c TK |
187 | (Ustrcmp(malware_regex,"0") == 0) ) { |
188 | /* explicitly no matching */ | |
189 | return FAIL; | |
190 | }; | |
8e669ac1 | 191 | |
8523533c | 192 | /* special cases (match anything except empty) */ |
8e669ac1 PH |
193 | if ( (strcmpic(malware_regex,US"true") == 0) || |
194 | (Ustrcmp(malware_regex,"*") == 0) || | |
8523533c TK |
195 | (Ustrcmp(malware_regex,"1") == 0) ) { |
196 | malware_regex = malware_regex_default; | |
197 | }; | |
198 | } | |
199 | else { | |
200 | /* empty means "don't match anything" */ | |
201 | return FAIL; | |
202 | }; | |
203 | ||
ee873c8c TK |
204 | /* Reset sep that is set by previous string_nextinlist() call */ |
205 | sep = 0; | |
206 | ||
8523533c TK |
207 | /* compile the regex, see if it works */ |
208 | re = pcre_compile(CS malware_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
209 | if (re == NULL) { | |
210 | log_write(0, LOG_MAIN|LOG_PANIC, | |
211 | "malware acl condition: regular expression error in '%s': %s at offset %d", malware_regex, rerror, roffset); | |
212 | return DEFER; | |
213 | }; | |
214 | ||
215 | /* if av_scanner starts with a dollar, expand it first */ | |
216 | if (*av_scanner == '$') { | |
217 | av_scanner_work = expand_string(av_scanner); | |
218 | if (av_scanner_work == NULL) { | |
219 | log_write(0, LOG_MAIN|LOG_PANIC, | |
220 | "malware acl condition: av_scanner starts with $, but expansion failed: %s", expand_string_message); | |
221 | return DEFER; | |
222 | } | |
223 | else { | |
224 | debug_printf("Expanded av_scanner global: %s\n", av_scanner_work); | |
225 | /* disable result caching in this case */ | |
226 | malware_name = NULL; | |
227 | malware_ok = 0; | |
228 | }; | |
229 | } | |
230 | ||
231 | /* Do not scan twice. */ | |
232 | if (malware_ok == 0) { | |
233 | ||
234 | /* find the scanner type from the av_scanner option */ | |
235 | if ((scanner_name = string_nextinlist(&av_scanner_work, &sep, | |
236 | scanner_name_buffer, | |
237 | sizeof(scanner_name_buffer))) == NULL) { | |
238 | /* no scanner given */ | |
239 | log_write(0, LOG_MAIN|LOG_PANIC, | |
240 | "malware acl condition: av_scanner configuration variable is empty"); | |
241 | return DEFER; | |
242 | }; | |
8e669ac1 | 243 | |
e5496194 TK |
244 | /* "f-protd" scanner type ----------------------------------------------- */ |
245 | if (strcmpic(scanner_name, US"f-protd") == 0) { | |
246 | uschar *fp_options, *fp_scan_option; | |
247 | uschar fp_scan_option_buffer[1024]; | |
248 | uschar fp_options_buffer[1024]; | |
249 | uschar fp_options_default[] = "localhost 10200-10204"; | |
250 | uschar hostname[256]; | |
251 | unsigned int port, portlow, porthigh, connect_ok=0, detected=0, par_count = 0; | |
252 | struct hostent *he; | |
253 | struct in_addr in; | |
254 | int sock; | |
255 | uschar scanrequest[2048], buf[32768], *strhelper, *strhelper2; | |
256 | ||
257 | if ((fp_options = string_nextinlist(&av_scanner_work, &sep, | |
258 | fp_options_buffer, sizeof(fp_options_buffer))) == NULL) { | |
259 | /* no options supplied, use default options */ | |
260 | fp_options = fp_options_default; | |
261 | }; | |
262 | ||
263 | /* extract host and port part */ | |
264 | if ( sscanf(CS fp_options, "%s %u-%u", hostname, &portlow, &porthigh) != 3 ) { | |
265 | if ( sscanf(CS fp_options, "%s %u", hostname, &portlow) != 2 ) { | |
266 | log_write(0, LOG_MAIN|LOG_PANIC, | |
267 | "malware acl condition: f-protd: invalid socket '%s'", fp_options); | |
268 | return DEFER; | |
269 | } | |
270 | porthigh = portlow; | |
271 | } | |
272 | ||
273 | /* Lookup the host */ | |
274 | if((he = gethostbyname(CS hostname)) == 0) { | |
275 | log_write(0, LOG_MAIN|LOG_PANIC, | |
276 | "malware acl condition: f-protd: failed to lookup host '%s'", hostname); | |
277 | return DEFER; | |
278 | } | |
279 | ||
280 | in = *(struct in_addr *) he->h_addr_list[0]; | |
281 | port = portlow; | |
282 | ||
283 | ||
284 | /* Open the f-protd TCP socket */ | |
285 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
286 | log_write(0, LOG_MAIN|LOG_PANIC, | |
287 | "malware acl condition: f-protd: unable to acquire socket (%s)", | |
288 | strerror(errno)); | |
289 | return DEFER; | |
290 | } | |
291 | ||
292 | /* Try to connect to all portslow-high until connection is established */ | |
293 | for (port = portlow; !connect_ok && port < porthigh; port++) { | |
294 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0) { | |
295 | connect_ok = 1; | |
296 | } | |
297 | } | |
298 | ||
299 | if ( !connect_ok ) { | |
300 | log_write(0, LOG_MAIN|LOG_PANIC, | |
301 | "malware acl condition: f-protd: connection to %s, port %u-%u failed (%s)", | |
302 | inet_ntoa(in), portlow, porthigh, strerror(errno)); | |
303 | (void)close(sock); | |
304 | return DEFER; | |
305 | } | |
306 | ||
8544e77a PP |
307 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name); |
308 | (void)string_format(scanrequest, 1024, CS"GET %s", eml_filename); | |
e5496194 TK |
309 | |
310 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, | |
311 | fp_scan_option_buffer, sizeof(fp_scan_option_buffer))) != NULL) { | |
312 | if ( par_count ) { | |
313 | Ustrcat(scanrequest, "%20"); | |
314 | } else { | |
315 | Ustrcat(scanrequest, "?"); | |
316 | } | |
317 | Ustrcat(scanrequest, fp_scan_option); | |
318 | par_count++; | |
319 | } | |
320 | Ustrcat(scanrequest, " HTTP/1.0\r\n\r\n"); | |
321 | ||
322 | /* send scan request */ | |
323 | if (send(sock, &scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
324 | (void)close(sock); | |
325 | log_write(0, LOG_MAIN|LOG_PANIC, | |
326 | "malware acl condition: f-protd: unable to send command to socket (%s)", scanrequest); | |
327 | return DEFER; | |
328 | } | |
329 | ||
330 | /* We get a lot of empty lines, so we need this hack to check for any data at all */ | |
331 | while( recv(sock, buf, 1, MSG_PEEK) > 0 ) { | |
332 | if ( recv_line(sock, buf, 32768) > 0) { | |
333 | if ( Ustrstr(buf, US"<detected type=\"") != NULL ) { | |
334 | detected = 1; | |
335 | } else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) { | |
7156b1ef | 336 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) { |
e5496194 TK |
337 | *strhelper2 = '\0'; |
338 | Ustrcpy(malware_name_buffer, strhelper + 6); | |
339 | } | |
340 | } else if ( Ustrstr(buf, US"<summary code=\"") ) { | |
341 | if ( Ustrstr(buf, US"<summary code=\"11\">") ) { | |
342 | malware_name = malware_name_buffer; | |
343 | } else { | |
344 | malware_name = NULL; | |
345 | } | |
346 | } | |
347 | } | |
348 | } | |
349 | (void)close(sock); | |
350 | } | |
384152a6 TK |
351 | /* "drweb" scanner type ----------------------------------------------- */ |
352 | /* v0.1 - added support for tcp sockets */ | |
353 | /* v0.0 - initial release -- support for unix sockets */ | |
e5496194 | 354 | else if (strcmpic(scanner_name,US"drweb") == 0) { |
384152a6 TK |
355 | uschar *drweb_options; |
356 | uschar drweb_options_buffer[1024]; | |
357 | uschar drweb_options_default[] = "/usr/local/drweb/run/drwebd.sock"; | |
358 | struct sockaddr_un server; | |
359 | int sock, result, ovector[30]; | |
360 | unsigned int port, fsize; | |
361 | uschar tmpbuf[1024], *drweb_fbuf; | |
384152a6 TK |
362 | uschar drweb_match_string[128]; |
363 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
364 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
365 | unsigned long bread; | |
366 | uschar hostname[256]; | |
367 | struct hostent *he; | |
368 | struct in_addr in; | |
369 | pcre *drweb_re; | |
370 | ||
371 | if ((drweb_options = string_nextinlist(&av_scanner_work, &sep, | |
372 | drweb_options_buffer, sizeof(drweb_options_buffer))) == NULL) { | |
373 | /* no options supplied, use default options */ | |
374 | drweb_options = drweb_options_default; | |
375 | }; | |
376 | ||
377 | if (*drweb_options != '/') { | |
378 | ||
379 | /* extract host and port part */ | |
380 | if( sscanf(CS drweb_options, "%s %u", hostname, &port) != 2 ) { | |
381 | log_write(0, LOG_MAIN|LOG_PANIC, | |
382 | "malware acl condition: drweb: invalid socket '%s'", drweb_options); | |
383 | return DEFER; | |
384 | } | |
385 | ||
386 | /* Lookup the host */ | |
387 | if((he = gethostbyname(CS hostname)) == 0) { | |
388 | log_write(0, LOG_MAIN|LOG_PANIC, | |
389 | "malware acl condition: drweb: failed to lookup host '%s'", hostname); | |
390 | return DEFER; | |
391 | } | |
392 | ||
393 | in = *(struct in_addr *) he->h_addr_list[0]; | |
394 | ||
395 | /* Open the drwebd TCP socket */ | |
396 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
397 | log_write(0, LOG_MAIN|LOG_PANIC, | |
398 | "malware acl condition: drweb: unable to acquire socket (%s)", | |
399 | strerror(errno)); | |
400 | return DEFER; | |
401 | } | |
402 | ||
403 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { | |
f1e894f3 | 404 | (void)close(sock); |
384152a6 TK |
405 | log_write(0, LOG_MAIN|LOG_PANIC, |
406 | "malware acl condition: drweb: connection to %s, port %u failed (%s)", | |
407 | inet_ntoa(in), port, strerror(errno)); | |
408 | return DEFER; | |
409 | } | |
410 | ||
411 | /* prepare variables */ | |
412 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
413 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
384152a6 TK |
414 | |
415 | /* calc file size */ | |
8544e77a | 416 | drweb_fd = open(CS eml_filename, O_RDONLY); |
384152a6 | 417 | if (drweb_fd == -1) { |
f1e894f3 | 418 | (void)close(sock); |
384152a6 TK |
419 | log_write(0, LOG_MAIN|LOG_PANIC, |
420 | "malware acl condition: drweb: can't open spool file %s: %s", | |
8544e77a | 421 | eml_filename, strerror(errno)); |
384152a6 TK |
422 | return DEFER; |
423 | } | |
424 | fsize = lseek(drweb_fd, 0, SEEK_END); | |
425 | if (fsize == -1) { | |
f1e894f3 PH |
426 | (void)close(sock); |
427 | (void)close(drweb_fd); | |
384152a6 TK |
428 | log_write(0, LOG_MAIN|LOG_PANIC, |
429 | "malware acl condition: drweb: can't seek spool file %s: %s", | |
8544e77a | 430 | eml_filename, strerror(errno)); |
384152a6 TK |
431 | return DEFER; |
432 | } | |
433 | drweb_slen = htonl(fsize); | |
434 | lseek(drweb_fd, 0, SEEK_SET); | |
435 | ||
8544e77a PP |
436 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s %u]\n", |
437 | scanner_name, hostname, port); | |
438 | ||
384152a6 TK |
439 | /* send scan request */ |
440 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
441 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
442 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
443 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) { | |
f1e894f3 PH |
444 | (void)close(sock); |
445 | (void)close(drweb_fd); | |
384152a6 TK |
446 | log_write(0, LOG_MAIN|LOG_PANIC, |
447 | "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options); | |
448 | return DEFER; | |
449 | } | |
450 | ||
451 | drweb_fbuf = (uschar *) malloc (fsize); | |
452 | if (!drweb_fbuf) { | |
f1e894f3 PH |
453 | (void)close(sock); |
454 | (void)close(drweb_fd); | |
384152a6 TK |
455 | log_write(0, LOG_MAIN|LOG_PANIC, |
456 | "malware acl condition: drweb: unable to allocate memory %u for file (%s)", | |
8544e77a | 457 | fsize, eml_filename); |
384152a6 TK |
458 | return DEFER; |
459 | } | |
460 | ||
461 | result = read (drweb_fd, drweb_fbuf, fsize); | |
462 | if (result == -1) { | |
f1e894f3 PH |
463 | (void)close(sock); |
464 | (void)close(drweb_fd); | |
384152a6 TK |
465 | free(drweb_fbuf); |
466 | log_write(0, LOG_MAIN|LOG_PANIC, | |
467 | "malware acl condition: drweb: can't read spool file %s: %s", | |
8544e77a | 468 | eml_filename, strerror(errno)); |
384152a6 TK |
469 | return DEFER; |
470 | } | |
f1e894f3 | 471 | (void)close(drweb_fd); |
384152a6 TK |
472 | |
473 | /* send file body to socket */ | |
474 | if (send(sock, drweb_fbuf, fsize, 0) < 0) { | |
f1e894f3 | 475 | (void)close(sock); |
384152a6 TK |
476 | free(drweb_fbuf); |
477 | log_write(0, LOG_MAIN|LOG_PANIC, | |
478 | "malware acl condition: drweb: unable to send file body to socket (%s)", drweb_options); | |
479 | return DEFER; | |
480 | } | |
f1e894f3 | 481 | (void)close(drweb_fd); |
384152a6 TK |
482 | } |
483 | else { | |
484 | /* open the drwebd UNIX socket */ | |
485 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
486 | if (sock < 0) { | |
487 | log_write(0, LOG_MAIN|LOG_PANIC, | |
488 | "malware acl condition: drweb: can't open UNIX socket"); | |
489 | return DEFER; | |
490 | } | |
491 | server.sun_family = AF_UNIX; | |
492 | Ustrcpy(server.sun_path, drweb_options); | |
493 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 494 | (void)close(sock); |
384152a6 TK |
495 | log_write(0, LOG_MAIN|LOG_PANIC, |
496 | "malware acl condition: drweb: unable to connect to socket (%s). errno=%d", drweb_options, errno); | |
497 | return DEFER; | |
498 | } | |
499 | ||
500 | /* prepare variables */ | |
501 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
502 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
8544e77a PP |
503 | drweb_slen = htonl(Ustrlen(eml_filename)); |
504 | ||
505 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n", | |
506 | scanner_name, drweb_options); | |
384152a6 TK |
507 | |
508 | /* send scan request */ | |
509 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
510 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
511 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
8544e77a | 512 | (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || |
384152a6 | 513 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) { |
f1e894f3 | 514 | (void)close(sock); |
384152a6 TK |
515 | log_write(0, LOG_MAIN|LOG_PANIC, |
516 | "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options); | |
517 | return DEFER; | |
518 | } | |
519 | } | |
520 | ||
521 | /* wait for result */ | |
522 | if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) { | |
f1e894f3 | 523 | (void)close(sock); |
384152a6 TK |
524 | log_write(0, LOG_MAIN|LOG_PANIC, |
525 | "malware acl condition: drweb: unable to read return code"); | |
526 | return DEFER; | |
527 | } | |
528 | drweb_rc = ntohl(drweb_rc); | |
529 | ||
530 | if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) { | |
f1e894f3 | 531 | (void)close(sock); |
384152a6 TK |
532 | log_write(0, LOG_MAIN|LOG_PANIC, |
533 | "malware acl condition: drweb: unable to read the number of viruses"); | |
534 | return DEFER; | |
535 | } | |
536 | drweb_vnum = ntohl(drweb_vnum); | |
537 | ||
538 | /* "virus(es) found" if virus number is > 0 */ | |
539 | if (drweb_vnum) | |
540 | { | |
541 | int i; | |
542 | uschar pre_malware_nb[256]; | |
543 | ||
544 | malware_name = malware_name_buffer; | |
545 | ||
546 | /* setup default virus name */ | |
547 | Ustrcpy(malware_name_buffer,"unknown"); | |
548 | ||
549 | /* read and concatenate virus names into one string */ | |
550 | for (i=0;i<drweb_vnum;i++) | |
551 | { | |
552 | /* read the size of report */ | |
553 | if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) { | |
f1e894f3 | 554 | (void)close(sock); |
384152a6 TK |
555 | log_write(0, LOG_MAIN|LOG_PANIC, |
556 | "malware acl condition: drweb: cannot read report size"); | |
557 | return DEFER; | |
558 | }; | |
559 | drweb_slen = ntohl(drweb_slen); | |
560 | ||
561 | /* read report body */ | |
562 | if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) { | |
f1e894f3 | 563 | (void)close(sock); |
384152a6 TK |
564 | log_write(0, LOG_MAIN|LOG_PANIC, |
565 | "malware acl condition: drweb: cannot read report string"); | |
566 | return DEFER; | |
567 | }; | |
568 | tmpbuf[drweb_slen] = '\0'; | |
569 | ||
570 | /* set up match regex, depends on retcode */ | |
571 | Ustrcpy(drweb_match_string, "infected\\swith\\s*(.+?)$"); | |
572 | ||
573 | drweb_re = pcre_compile( CS drweb_match_string, | |
574 | PCRE_COPT, | |
575 | (const char **)&rerror, | |
576 | &roffset, | |
577 | NULL ); | |
578 | ||
579 | /* try matcher on the line, grab substring */ | |
580 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
581 | if (result >= 2) { | |
582 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS pre_malware_nb, 255); | |
583 | } | |
584 | /* the first name we just copy to malware_name */ | |
585 | if (i==0) | |
586 | Ustrcpy(CS malware_name_buffer, CS pre_malware_nb); | |
587 | else { | |
588 | /* concatenate each new virus name to previous */ | |
589 | int slen = Ustrlen(malware_name_buffer); | |
590 | if (slen < (slen+Ustrlen(pre_malware_nb))) { | |
591 | Ustrcat(malware_name_buffer, "/"); | |
592 | Ustrcat(malware_name_buffer, pre_malware_nb); | |
593 | } | |
594 | } | |
595 | } | |
596 | } | |
597 | else { | |
1ba28e2b | 598 | const char *drweb_s = NULL; |
384152a6 TK |
599 | |
600 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
601 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
602 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
603 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
604 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
605 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
606 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
607 | * and others are ignored */ | |
608 | if (drweb_s) { | |
609 | log_write(0, LOG_MAIN|LOG_PANIC, | |
610 | "malware acl condition: drweb: drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s); | |
f1e894f3 | 611 | (void)close(sock); |
384152a6 TK |
612 | return DEFER; |
613 | } | |
614 | /* no virus found */ | |
615 | malware_name = NULL; | |
616 | }; | |
f1e894f3 | 617 | (void)close(sock); |
384152a6 TK |
618 | } |
619 | /* ----------------------------------------------------------------------- */ | |
8523533c TK |
620 | else if (strcmpic(scanner_name,US"aveserver") == 0) { |
621 | uschar *kav_options; | |
622 | uschar kav_options_buffer[1024]; | |
623 | uschar kav_options_default[] = "/var/run/aveserver"; | |
624 | uschar buf[32768]; | |
8523533c TK |
625 | struct sockaddr_un server; |
626 | int sock; | |
7e274b4b | 627 | int result; |
8e669ac1 | 628 | |
8523533c TK |
629 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
630 | kav_options_buffer, | |
631 | sizeof(kav_options_buffer))) == NULL) { | |
632 | /* no options supplied, use default options */ | |
633 | kav_options = kav_options_default; | |
634 | }; | |
8e669ac1 | 635 | |
8523533c TK |
636 | /* open the aveserver socket */ |
637 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
638 | if (sock < 0) { | |
639 | log_write(0, LOG_MAIN|LOG_PANIC, | |
640 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 641 | return DEFER; |
8523533c TK |
642 | } |
643 | server.sun_family = AF_UNIX; | |
644 | Ustrcpy(server.sun_path, kav_options); | |
645 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 646 | (void)close(sock); |
8523533c TK |
647 | log_write(0, LOG_MAIN|LOG_PANIC, |
648 | "malware acl condition: unable to connect to aveserver UNIX socket (%s). errno=%d", kav_options, errno); | |
649 | return DEFER; | |
650 | } | |
8e669ac1 | 651 | |
8523533c TK |
652 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
653 | recv_line(sock, buf, 32768); | |
654 | ||
655 | if (buf[0] != '2') { | |
656 | /* aveserver is having problems */ | |
f1e894f3 | 657 | (void)close(sock); |
8523533c TK |
658 | log_write(0, LOG_MAIN|LOG_PANIC, |
659 | "malware acl condition: aveserver is unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
660 | return DEFER; | |
661 | }; | |
8e669ac1 | 662 | |
8523533c | 663 | /* prepare our command */ |
8544e77a PP |
664 | (void)string_format(buf, 32768, "SCAN bPQRSTUW %s\r\n", eml_filename); |
665 | ||
666 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name); | |
8e669ac1 | 667 | |
8523533c TK |
668 | /* and send it */ |
669 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 670 | (void)close(sock); |
8523533c TK |
671 | log_write(0, LOG_MAIN|LOG_PANIC, |
672 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
673 | return DEFER; | |
674 | } | |
8e669ac1 | 675 | |
8523533c | 676 | malware_name = NULL; |
7e274b4b | 677 | result = 0; |
8523533c TK |
678 | /* read response lines, find malware name and final response */ |
679 | while (recv_line(sock, buf, 32768) > 0) { | |
680 | debug_printf("aveserver: %s\n", buf); | |
7e274b4b TK |
681 | if (buf[0] == '2') { |
682 | break; | |
683 | } else if (buf[0] == '5') { | |
684 | /* aveserver is having problems */ | |
685 | log_write(0, LOG_MAIN|LOG_PANIC, | |
8544e77a PP |
686 | "malware acl condition: unable to scan file %s (Responded: %s).", |
687 | eml_filename, buf); | |
7e274b4b TK |
688 | result = DEFER; |
689 | break; | |
690 | } else if (Ustrncmp(buf,"322",3) == 0) { | |
8523533c TK |
691 | uschar *p = Ustrchr(&buf[4],' '); |
692 | *p = '\0'; | |
693 | Ustrcpy(malware_name_buffer,&buf[4]); | |
694 | malware_name = malware_name_buffer; | |
7e274b4b TK |
695 | }; |
696 | } | |
697 | ||
698 | /* prepare our command */ | |
b07e6aa3 | 699 | (void)string_format(buf, 32768, "quit\r\n"); |
7e274b4b TK |
700 | |
701 | /* and send it */ | |
702 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 703 | (void)close(sock); |
7e274b4b TK |
704 | log_write(0, LOG_MAIN|LOG_PANIC, |
705 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
706 | return DEFER; | |
8523533c TK |
707 | } |
708 | ||
7e274b4b TK |
709 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
710 | recv_line(sock, buf, 32768); | |
711 | ||
712 | if (buf[0] != '2') { | |
713 | /* aveserver is having problems */ | |
f1e894f3 | 714 | (void)close(sock); |
7e274b4b TK |
715 | log_write(0, LOG_MAIN|LOG_PANIC, |
716 | "malware acl condition: unable to quit aveserver dialogue (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
717 | return DEFER; | |
718 | }; | |
719 | ||
f1e894f3 | 720 | (void)close(sock); |
7e274b4b TK |
721 | |
722 | if (result == DEFER) return DEFER; | |
8523533c TK |
723 | } |
724 | /* "fsecure" scanner type ------------------------------------------------- */ | |
725 | else if (strcmpic(scanner_name,US"fsecure") == 0) { | |
726 | uschar *fsecure_options; | |
727 | uschar fsecure_options_buffer[1024]; | |
728 | uschar fsecure_options_default[] = "/var/run/.fsav"; | |
729 | struct sockaddr_un server; | |
730 | int sock, i, j, bread = 0; | |
731 | uschar file_name[1024]; | |
732 | uschar av_buffer[1024]; | |
733 | pcre *fs_inf; | |
f7b63901 PH |
734 | static uschar *cmdoptions[] = { US"CONFIGURE\tARCHIVE\t1\n", |
735 | US"CONFIGURE\tTIMEOUT\t0\n", | |
736 | US"CONFIGURE\tMAXARCH\t5\n", | |
737 | US"CONFIGURE\tMIME\t1\n" }; | |
8e669ac1 | 738 | |
8523533c TK |
739 | malware_name = NULL; |
740 | if ((fsecure_options = string_nextinlist(&av_scanner_work, &sep, | |
741 | fsecure_options_buffer, | |
8e669ac1 | 742 | sizeof(fsecure_options_buffer))) == NULL) { |
8523533c TK |
743 | /* no options supplied, use default options */ |
744 | fsecure_options = fsecure_options_default; | |
745 | }; | |
8e669ac1 | 746 | |
8523533c TK |
747 | /* open the fsecure socket */ |
748 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
749 | if (sock < 0) { | |
750 | log_write(0, LOG_MAIN|LOG_PANIC, | |
751 | "malware acl condition: unable to open fsecure socket %s (%s)", | |
752 | fsecure_options, strerror(errno)); | |
753 | return DEFER; | |
754 | } | |
755 | server.sun_family = AF_UNIX; | |
756 | Ustrcpy(server.sun_path, fsecure_options); | |
757 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 758 | (void)close(sock); |
8523533c TK |
759 | log_write(0, LOG_MAIN|LOG_PANIC, |
760 | "malware acl condition: unable to connect to fsecure socket %s (%s)", | |
761 | fsecure_options, strerror(errno)); | |
762 | return DEFER; | |
763 | } | |
8e669ac1 | 764 | |
8544e77a PP |
765 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
766 | scanner_name, fsecure_options); | |
767 | ||
8523533c TK |
768 | /* pass options */ |
769 | memset(av_buffer, 0, sizeof(av_buffer)); | |
770 | for (i=0; i != 4; i++) { | |
771 | /* debug_printf("send option \"%s\"",cmdoptions[i]); */ | |
772 | if (write(sock, cmdoptions[i], Ustrlen(cmdoptions[i])) < 0) { | |
f1e894f3 | 773 | (void)close(sock); |
8523533c TK |
774 | log_write(0, LOG_MAIN|LOG_PANIC, |
775 | "malware acl condition: unable to write fsecure option %d to %s (%s)", | |
776 | i, fsecure_options, strerror(errno)); | |
8e669ac1 | 777 | return DEFER; |
8523533c | 778 | }; |
8e669ac1 | 779 | |
a9ccd69a | 780 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
8523533c TK |
781 | if (bread >0) av_buffer[bread]='\0'; |
782 | if (bread < 0) { | |
f1e894f3 | 783 | (void)close(sock); |
8523533c TK |
784 | log_write(0, LOG_MAIN|LOG_PANIC, |
785 | "malware acl condition: unable to read fsecure answer %d (%s)", i, strerror(errno)); | |
786 | return DEFER; | |
787 | }; | |
788 | for (j=0;j<bread;j++) if((av_buffer[j]=='\r')||(av_buffer[j]=='\n')) av_buffer[j] ='@'; | |
789 | /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */ | |
790 | /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */ | |
791 | }; | |
8e669ac1 | 792 | |
8523533c | 793 | /* pass the mailfile to fsecure */ |
8544e77a | 794 | (void)string_format(file_name,1024,"SCAN\t%s\n", eml_filename); |
8523533c TK |
795 | /* debug_printf("send scan %s",file_name); */ |
796 | if (write(sock, file_name, Ustrlen(file_name)) < 0) { | |
f1e894f3 | 797 | (void)close(sock); |
8523533c TK |
798 | log_write(0, LOG_MAIN|LOG_PANIC, |
799 | "malware acl condition: unable to write fsecure scan to %s (%s)", | |
800 | fsecure_options, strerror(errno)); | |
801 | return DEFER; | |
802 | }; | |
8e669ac1 | 803 | |
8523533c TK |
804 | /* set up match */ |
805 | /* todo also SUSPICION\t */ | |
806 | fs_inf = pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
8e669ac1 | 807 | |
8523533c TK |
808 | /* read report, linewise */ |
809 | do { | |
810 | int ovector[30]; | |
811 | i = 0; | |
812 | memset(av_buffer, 0, sizeof(av_buffer)); | |
813 | do { | |
a9ccd69a | 814 | bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT); |
8523533c | 815 | if (bread < 0) { |
f1e894f3 | 816 | (void)close(sock); |
8523533c TK |
817 | log_write(0, LOG_MAIN|LOG_PANIC, |
818 | "malware acl condition: unable to read fsecure result (%s)", strerror(errno)); | |
819 | return DEFER; | |
820 | }; | |
821 | i++; | |
822 | } | |
823 | while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n')); | |
824 | av_buffer[i-1] = '\0'; | |
825 | /* debug_printf("got line \"%s\"\n",av_buffer); */ | |
8e669ac1 | 826 | |
8523533c TK |
827 | /* Really search for virus again? */ |
828 | if (malware_name == NULL) { | |
829 | /* try matcher on the line, grab substring */ | |
830 | i = pcre_exec(fs_inf, NULL, CS av_buffer, Ustrlen(av_buffer), 0, 0, ovector, 30); | |
831 | if (i >= 2) { | |
832 | /* Got it */ | |
833 | pcre_copy_substring(CS av_buffer, ovector, i, 1, CS malware_name_buffer, 255); | |
834 | malware_name = malware_name_buffer; | |
835 | }; | |
836 | }; | |
837 | } | |
838 | while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL); | |
f1e894f3 | 839 | (void)close(sock); |
8523533c TK |
840 | } |
841 | /* ----------------------------------------------------------------------- */ | |
842 | ||
843 | /* "kavdaemon" scanner type ------------------------------------------------ */ | |
844 | else if (strcmpic(scanner_name,US"kavdaemon") == 0) { | |
845 | uschar *kav_options; | |
846 | uschar kav_options_buffer[1024]; | |
847 | uschar kav_options_default[] = "/var/run/AvpCtl"; | |
848 | struct sockaddr_un server; | |
849 | int sock; | |
850 | time_t t; | |
851 | uschar tmpbuf[1024]; | |
852 | uschar scanrequest[1024]; | |
853 | uschar kav_match_string[128]; | |
854 | int kav_rc; | |
855 | unsigned long kav_reportlen, bread; | |
856 | pcre *kav_re; | |
8544e77a PP |
857 | uschar *p; |
858 | int fits; | |
8e669ac1 | 859 | |
8523533c TK |
860 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
861 | kav_options_buffer, | |
862 | sizeof(kav_options_buffer))) == NULL) { | |
863 | /* no options supplied, use default options */ | |
864 | kav_options = kav_options_default; | |
865 | }; | |
8e669ac1 | 866 | |
8523533c TK |
867 | /* open the kavdaemon socket */ |
868 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
869 | if (sock < 0) { | |
870 | log_write(0, LOG_MAIN|LOG_PANIC, | |
871 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 872 | return DEFER; |
8523533c TK |
873 | } |
874 | server.sun_family = AF_UNIX; | |
875 | Ustrcpy(server.sun_path, kav_options); | |
876 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 877 | (void)close(sock); |
8523533c TK |
878 | log_write(0, LOG_MAIN|LOG_PANIC, |
879 | "malware acl condition: unable to connect to kavdaemon UNIX socket (%s). errno=%d", kav_options, errno); | |
880 | return DEFER; | |
881 | } | |
8e669ac1 | 882 | |
8523533c TK |
883 | /* get current date and time, build scan request */ |
884 | time(&t); | |
8544e77a PP |
885 | /* pdp note: before the eml_filename parameter, this scanned the |
886 | directory; not finding documentation, so we'll strip off the directory. | |
887 | The side-effect is that the test framework scanning may end up in | |
888 | scanning more than was requested, but for the normal interface, this is | |
889 | fine. */ | |
890 | strftime(CS tmpbuf, sizeof(tmpbuf), "<0>%d %b %H:%M:%S:%%s", localtime(&t)); | |
891 | fits = string_format(scanrequest, 1024,CS tmpbuf, eml_filename); | |
892 | if (!fits) { | |
893 | (void)close(sock); | |
894 | log_write(0, LOG_MAIN|LOG_PANIC, | |
895 | "malware filename does not fit in buffer [malware_internal() kavdaemon]"); | |
896 | } | |
73a46702 | 897 | p = Ustrrchr(scanrequest, '/'); |
8544e77a PP |
898 | if (p) |
899 | *p = '\0'; | |
900 | ||
901 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
902 | scanner_name, kav_options); | |
8e669ac1 | 903 | |
8523533c TK |
904 | /* send scan request */ |
905 | if (send(sock, scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
f1e894f3 | 906 | (void)close(sock); |
8523533c TK |
907 | log_write(0, LOG_MAIN|LOG_PANIC, |
908 | "malware acl condition: unable to write to kavdaemon UNIX socket (%s)", kav_options); | |
909 | return DEFER; | |
910 | } | |
8e669ac1 | 911 | |
8523533c TK |
912 | /* wait for result */ |
913 | if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) { | |
f1e894f3 | 914 | (void)close(sock); |
8523533c TK |
915 | log_write(0, LOG_MAIN|LOG_PANIC, |
916 | "malware acl condition: unable to read 2 bytes from kavdaemon socket."); | |
917 | return DEFER; | |
918 | } | |
8e669ac1 | 919 | |
8523533c TK |
920 | /* get errorcode from one nibble */ |
921 | if (test_byte_order() == LITTLE_MY_ENDIAN) { | |
922 | kav_rc = tmpbuf[0] & 0x0F; | |
923 | } | |
924 | else { | |
925 | kav_rc = tmpbuf[1] & 0x0F; | |
926 | }; | |
8e669ac1 | 927 | |
8523533c TK |
928 | /* improper kavdaemon configuration */ |
929 | if ( (kav_rc == 5) || (kav_rc == 6) ) { | |
f1e894f3 | 930 | (void)close(sock); |
8523533c TK |
931 | log_write(0, LOG_MAIN|LOG_PANIC, |
932 | "malware acl condition: please reconfigure kavdaemon to NOT disinfect or remove infected files."); | |
933 | return DEFER; | |
934 | }; | |
8e669ac1 | 935 | |
8523533c | 936 | if (kav_rc == 1) { |
f1e894f3 | 937 | (void)close(sock); |
8523533c TK |
938 | log_write(0, LOG_MAIN|LOG_PANIC, |
939 | "malware acl condition: kavdaemon reported 'scanning not completed' (code 1)."); | |
940 | return DEFER; | |
941 | }; | |
8e669ac1 | 942 | |
8523533c | 943 | if (kav_rc == 7) { |
f1e894f3 | 944 | (void)close(sock); |
8523533c TK |
945 | log_write(0, LOG_MAIN|LOG_PANIC, |
946 | "malware acl condition: kavdaemon reported 'kavdaemon damaged' (code 7)."); | |
947 | return DEFER; | |
948 | }; | |
8e669ac1 | 949 | |
8523533c TK |
950 | /* code 8 is not handled, since it is ambigous. It appears mostly on |
951 | bounces where part of a file has been cut off */ | |
8e669ac1 | 952 | |
8523533c TK |
953 | /* "virus found" return codes (2-4) */ |
954 | if ((kav_rc > 1) && (kav_rc < 5)) { | |
955 | int report_flag = 0; | |
8e669ac1 | 956 | |
8523533c TK |
957 | /* setup default virus name */ |
958 | Ustrcpy(malware_name_buffer,"unknown"); | |
959 | malware_name = malware_name_buffer; | |
8e669ac1 | 960 | |
8523533c TK |
961 | if (test_byte_order() == LITTLE_MY_ENDIAN) { |
962 | report_flag = tmpbuf[1]; | |
963 | } | |
964 | else { | |
965 | report_flag = tmpbuf[0]; | |
966 | }; | |
8e669ac1 | 967 | |
8523533c TK |
968 | /* read the report, if available */ |
969 | if( report_flag == 1 ) { | |
970 | /* read report size */ | |
971 | if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) { | |
f1e894f3 | 972 | (void)close(sock); |
8523533c TK |
973 | log_write(0, LOG_MAIN|LOG_PANIC, |
974 | "malware acl condition: cannot read report size from kavdaemon"); | |
975 | return DEFER; | |
976 | }; | |
8e669ac1 | 977 | |
8523533c TK |
978 | /* it's possible that avp returns av_buffer[1] == 1 but the |
979 | reportsize is 0 (!?) */ | |
980 | if (kav_reportlen > 0) { | |
981 | /* set up match regex, depends on retcode */ | |
982 | if( kav_rc == 3 ) | |
983 | Ustrcpy(kav_match_string, "suspicion:\\s*(.+?)\\s*$"); | |
984 | else | |
985 | Ustrcpy(kav_match_string, "infected:\\s*(.+?)\\s*$"); | |
8e669ac1 | 986 | |
8523533c TK |
987 | kav_re = pcre_compile( CS kav_match_string, |
988 | PCRE_COPT, | |
989 | (const char **)&rerror, | |
990 | &roffset, | |
991 | NULL ); | |
8e669ac1 PH |
992 | |
993 | /* read report, linewise */ | |
8523533c TK |
994 | while (kav_reportlen > 0) { |
995 | int result = 0; | |
996 | int ovector[30]; | |
8e669ac1 | 997 | |
8523533c TK |
998 | bread = 0; |
999 | while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) { | |
1000 | kav_reportlen--; | |
1001 | if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break; | |
1002 | bread++; | |
1003 | }; | |
1004 | bread++; | |
1005 | tmpbuf[bread] = '\0'; | |
8e669ac1 | 1006 | |
8523533c TK |
1007 | /* try matcher on the line, grab substring */ |
1008 | result = pcre_exec(kav_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
1009 | if (result >= 2) { | |
1010 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS malware_name_buffer, 255); | |
1011 | break; | |
1012 | }; | |
1013 | }; | |
1014 | }; | |
1015 | }; | |
1016 | } | |
1017 | else { | |
1018 | /* no virus found */ | |
1019 | malware_name = NULL; | |
1020 | }; | |
8e669ac1 | 1021 | |
f1e894f3 | 1022 | (void)close(sock); |
8523533c TK |
1023 | } |
1024 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1025 | |
1026 | ||
8523533c TK |
1027 | /* "cmdline" scanner type ------------------------------------------------ */ |
1028 | else if (strcmpic(scanner_name,US"cmdline") == 0) { | |
1029 | uschar *cmdline_scanner; | |
1030 | uschar cmdline_scanner_buffer[1024]; | |
1031 | uschar *cmdline_trigger; | |
1032 | uschar cmdline_trigger_buffer[1024]; | |
1033 | const pcre *cmdline_trigger_re; | |
1034 | uschar *cmdline_regex; | |
1035 | uschar cmdline_regex_buffer[1024]; | |
1036 | const pcre *cmdline_regex_re; | |
1037 | uschar file_name[1024]; | |
1038 | uschar commandline[1024]; | |
1039 | void (*eximsigchld)(int); | |
1040 | void (*eximsigpipe)(int); | |
1041 | FILE *scanner_out = NULL; | |
1042 | FILE *scanner_record = NULL; | |
1043 | uschar linebuffer[32767]; | |
1044 | int trigger = 0; | |
1045 | int result; | |
1046 | int ovector[30]; | |
8544e77a PP |
1047 | uschar *p; |
1048 | BOOL fits; | |
8e669ac1 | 1049 | |
8523533c TK |
1050 | /* find scanner command line */ |
1051 | if ((cmdline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
1052 | cmdline_scanner_buffer, | |
1053 | sizeof(cmdline_scanner_buffer))) == NULL) { | |
1054 | /* no command line supplied */ | |
1055 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1056 | "malware acl condition: missing commandline specification for cmdline scanner type."); | |
8e669ac1 | 1057 | return DEFER; |
8523533c | 1058 | }; |
8e669ac1 | 1059 | |
8523533c TK |
1060 | /* find scanner output trigger */ |
1061 | if ((cmdline_trigger = string_nextinlist(&av_scanner_work, &sep, | |
1062 | cmdline_trigger_buffer, | |
1063 | sizeof(cmdline_trigger_buffer))) == NULL) { | |
1064 | /* no trigger regex supplied */ | |
1065 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1066 | "malware acl condition: missing trigger specification for cmdline scanner type."); | |
8e669ac1 | 1067 | return DEFER; |
8523533c | 1068 | }; |
8e669ac1 | 1069 | |
8523533c TK |
1070 | /* precompile trigger regex */ |
1071 | cmdline_trigger_re = pcre_compile(CS cmdline_trigger, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
1072 | if (cmdline_trigger_re == NULL) { | |
1073 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1074 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_trigger_re, rerror, roffset); | |
1075 | return DEFER; | |
1076 | }; | |
8e669ac1 | 1077 | |
8523533c TK |
1078 | /* find scanner name regex */ |
1079 | if ((cmdline_regex = string_nextinlist(&av_scanner_work, &sep, | |
1080 | cmdline_regex_buffer, | |
1081 | sizeof(cmdline_regex_buffer))) == NULL) { | |
1082 | /* no name regex supplied */ | |
1083 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1084 | "malware acl condition: missing virus name regex specification for cmdline scanner type."); | |
8e669ac1 | 1085 | return DEFER; |
8523533c | 1086 | }; |
8e669ac1 | 1087 | |
8523533c TK |
1088 | /* precompile name regex */ |
1089 | cmdline_regex_re = pcre_compile(CS cmdline_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
1090 | if (cmdline_regex_re == NULL) { | |
1091 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1092 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_regex_re, rerror, roffset); | |
1093 | return DEFER; | |
1094 | }; | |
8e669ac1 | 1095 | |
8544e77a PP |
1096 | /* prepare scanner call; despite the naming, file_name holds a directory |
1097 | name which is documented as the value given to %s. */ | |
1098 | if (Ustrlen(eml_filename) > sizeof(file_name) - 1) | |
1099 | { | |
1100 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1101 | "malware filename does not fit in buffer [malware_internal() cmdline]"); | |
1102 | return DEFER; | |
1103 | } | |
3346ab01 PP |
1104 | Ustrcpy(file_name, eml_filename); |
1105 | p = Ustrrchr(file_name, '/'); | |
8544e77a PP |
1106 | if (p) |
1107 | *p = '\0'; | |
1108 | fits = string_format(commandline, sizeof(commandline), CS cmdline_scanner, file_name); | |
1109 | if (!fits) | |
1110 | { | |
1111 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1112 | "cmdline scanner command-line does not fit in buffer"); | |
1113 | return DEFER; | |
1114 | } | |
1115 | ||
8523533c | 1116 | /* redirect STDERR too */ |
8544e77a PP |
1117 | if (Ustrlen(commandline) + 5 > sizeof(commandline)) |
1118 | { | |
1119 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1120 | "cmdline scanner command-line does not fit in buffer (STDERR redirect)"); | |
1121 | return DEFER; | |
1122 | } | |
8523533c | 1123 | Ustrcat(commandline," 2>&1"); |
8e669ac1 | 1124 | |
8544e77a PP |
1125 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline); |
1126 | ||
8523533c TK |
1127 | /* store exims signal handlers */ |
1128 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1129 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
8e669ac1 | 1130 | |
8523533c TK |
1131 | scanner_out = popen(CS commandline,"r"); |
1132 | if (scanner_out == NULL) { | |
1133 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1134 | "malware acl condition: calling cmdline scanner (%s) failed: %s.", commandline, strerror(errno)); | |
1135 | signal(SIGCHLD,eximsigchld); | |
1136 | signal(SIGPIPE,eximsigpipe); | |
1137 | return DEFER; | |
1138 | }; | |
8e669ac1 | 1139 | |
b07e6aa3 | 1140 | (void)string_format(file_name,1024,"%s/scan/%s/%s_scanner_output", spool_directory, message_id, message_id); |
2632889e | 1141 | scanner_record = modefopen(file_name,"wb",SPOOL_MODE); |
8e669ac1 | 1142 | |
8523533c TK |
1143 | if (scanner_record == NULL) { |
1144 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1145 | "malware acl condition: opening scanner output file (%s) failed: %s.", file_name, strerror(errno)); | |
1146 | pclose(scanner_out); | |
1147 | signal(SIGCHLD,eximsigchld); | |
1148 | signal(SIGPIPE,eximsigpipe); | |
1149 | return DEFER; | |
1150 | }; | |
8e669ac1 | 1151 | |
8523533c TK |
1152 | /* look for trigger while recording output */ |
1153 | while(fgets(CS linebuffer,32767,scanner_out) != NULL) { | |
1154 | if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) { | |
1155 | /* short write */ | |
1156 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1157 | "malware acl condition: short write on scanner output file (%s).", file_name); | |
1158 | pclose(scanner_out); | |
1159 | signal(SIGCHLD,eximsigchld); | |
1160 | signal(SIGPIPE,eximsigpipe); | |
1161 | return DEFER; | |
1162 | }; | |
1163 | /* try trigger match */ | |
1164 | if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1)) | |
1165 | trigger = 1; | |
1166 | }; | |
8e669ac1 | 1167 | |
f1e894f3 | 1168 | (void)fclose(scanner_record); |
8523533c TK |
1169 | pclose(scanner_out); |
1170 | signal(SIGCHLD,eximsigchld); | |
1171 | signal(SIGPIPE,eximsigpipe); | |
8e669ac1 | 1172 | |
8523533c TK |
1173 | if (trigger) { |
1174 | /* setup default virus name */ | |
1175 | Ustrcpy(malware_name_buffer,"unknown"); | |
1176 | malware_name = malware_name_buffer; | |
8e669ac1 | 1177 | |
8523533c | 1178 | /* re-open the scanner output file, look for name match */ |
c58b88df | 1179 | scanner_record = fopen(CS file_name,"rb"); |
8523533c TK |
1180 | while(fgets(CS linebuffer,32767,scanner_record) != NULL) { |
1181 | /* try match */ | |
1182 | result = pcre_exec(cmdline_regex_re, NULL, CS linebuffer, Ustrlen(linebuffer), 0, 0, ovector, 30); | |
1183 | if (result >= 2) { | |
1184 | pcre_copy_substring(CS linebuffer, ovector, result, 1, CS malware_name_buffer, 255); | |
1185 | }; | |
1186 | }; | |
f1e894f3 | 1187 | (void)fclose(scanner_record); |
8523533c TK |
1188 | } |
1189 | else { | |
1190 | /* no virus found */ | |
1191 | malware_name = NULL; | |
1192 | }; | |
1193 | } | |
1194 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1195 | |
1196 | ||
8523533c TK |
1197 | /* "sophie" scanner type ------------------------------------------------- */ |
1198 | else if (strcmpic(scanner_name,US"sophie") == 0) { | |
1199 | uschar *sophie_options; | |
1200 | uschar sophie_options_buffer[1024]; | |
1201 | uschar sophie_options_default[] = "/var/run/sophie"; | |
1202 | int bread = 0; | |
1203 | struct sockaddr_un server; | |
8544e77a PP |
1204 | int sock, len; |
1205 | uschar *p; | |
8523533c TK |
1206 | uschar file_name[1024]; |
1207 | uschar av_buffer[1024]; | |
8e669ac1 | 1208 | |
8523533c TK |
1209 | if ((sophie_options = string_nextinlist(&av_scanner_work, &sep, |
1210 | sophie_options_buffer, | |
1211 | sizeof(sophie_options_buffer))) == NULL) { | |
1212 | /* no options supplied, use default options */ | |
1213 | sophie_options = sophie_options_default; | |
1214 | }; | |
8e669ac1 | 1215 | |
8523533c TK |
1216 | /* open the sophie socket */ |
1217 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1218 | if (sock < 0) { | |
1219 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1220 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1221 | return DEFER; |
8523533c TK |
1222 | } |
1223 | server.sun_family = AF_UNIX; | |
1224 | Ustrcpy(server.sun_path, sophie_options); | |
1225 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1226 | (void)close(sock); |
8523533c TK |
1227 | log_write(0, LOG_MAIN|LOG_PANIC, |
1228 | "malware acl condition: unable to connect to sophie UNIX socket (%s). errno=%d", sophie_options, errno); | |
1229 | return DEFER; | |
1230 | } | |
8e669ac1 | 1231 | |
8523533c | 1232 | /* pass the scan directory to sophie */ |
8544e77a PP |
1233 | len = Ustrlen(eml_filename) + 1; |
1234 | if (len > sizeof(file_name)) | |
1235 | { | |
1236 | (void)close(sock); | |
1237 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1238 | "malware filename does not fit in buffer [malware_internal() sophie]"); | |
1239 | return DEFER; | |
1240 | } | |
1241 | memcpy(file_name, eml_filename, len); | |
73a46702 | 1242 | p = Ustrrchr(file_name, '/'); |
8544e77a PP |
1243 | if (p) |
1244 | *p = '\0'; | |
1245 | ||
1246 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
1247 | scanner_name, sophie_options); | |
1248 | ||
8523533c | 1249 | if (write(sock, file_name, Ustrlen(file_name)) < 0) { |
f1e894f3 | 1250 | (void)close(sock); |
8523533c TK |
1251 | log_write(0, LOG_MAIN|LOG_PANIC, |
1252 | "malware acl condition: unable to write to sophie UNIX socket (%s)", sophie_options); | |
8e669ac1 | 1253 | return DEFER; |
8523533c | 1254 | }; |
8e669ac1 | 1255 | |
f1e894f3 | 1256 | (void)write(sock, "\n", 1); |
8e669ac1 | 1257 | |
8523533c TK |
1258 | /* wait for result */ |
1259 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1260 | if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) { |
f1e894f3 | 1261 | (void)close(sock); |
8523533c TK |
1262 | log_write(0, LOG_MAIN|LOG_PANIC, |
1263 | "malware acl condition: unable to read from sophie UNIX socket (%s)", sophie_options); | |
1264 | return DEFER; | |
1265 | }; | |
8e669ac1 | 1266 | |
f1e894f3 | 1267 | (void)close(sock); |
8e669ac1 | 1268 | |
8523533c TK |
1269 | /* infected ? */ |
1270 | if (av_buffer[0] == '1') { | |
1271 | if (Ustrchr(av_buffer, '\n')) *Ustrchr(av_buffer, '\n') = '\0'; | |
1272 | Ustrcpy(malware_name_buffer,&av_buffer[2]); | |
1273 | malware_name = malware_name_buffer; | |
1274 | } | |
1275 | else if (!strncmp(CS av_buffer, "-1", 2)) { | |
1276 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1277 | "malware acl condition: malware acl condition: sophie reported error"); | |
1278 | return DEFER; | |
1279 | } | |
1280 | else { | |
1281 | /* all ok, no virus */ | |
1282 | malware_name = NULL; | |
1283 | }; | |
1284 | } | |
1285 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1286 | |
8523533c TK |
1287 | |
1288 | /* "clamd" scanner type ------------------------------------------------- */ | |
8544e77a PP |
1289 | /* This code was originally contributed by David Saez */ |
1290 | /* There are three scanning methods available to us: | |
1291 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1292 | * (2) Use the STREAM command, send the data on a separate port | |
1293 | * (3) Use the zINSTREAM command, send the data inline | |
1294 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1295 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1296 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
1297 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless | |
1298 | * WITH_OLD_CLAMAV_STREAM is defined. | |
1299 | * See Exim bug 926 for details. */ | |
8523533c TK |
1300 | else if (strcmpic(scanner_name,US"clamd") == 0) { |
1301 | uschar *clamd_options; | |
1302 | uschar clamd_options_buffer[1024]; | |
1303 | uschar clamd_options_default[] = "/tmp/clamd"; | |
94a18f28 | 1304 | uschar *p, *vname, *result_tag, *response_end; |
8523533c | 1305 | struct sockaddr_un server; |
f7b63901 | 1306 | int sock,bread=0; |
8e669ac1 | 1307 | unsigned int port; |
8523533c TK |
1308 | uschar file_name[1024]; |
1309 | uschar av_buffer[1024]; | |
1310 | uschar hostname[256]; | |
1311 | struct hostent *he; | |
1312 | struct in_addr in; | |
2376f2f5 TK |
1313 | uschar *clamd_options2; |
1314 | uschar clamd_options2_buffer[1024]; | |
1315 | uschar clamd_options2_default[] = ""; | |
2376f2f5 | 1316 | uschar *clamav_fbuf; |
73a46702 | 1317 | int clam_fd, result; |
2376f2f5 | 1318 | unsigned int fsize; |
8544e77a PP |
1319 | BOOL use_scan_command, fits; |
1320 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1321 | uschar av_buffer2[1024]; | |
73a46702 | 1322 | int sockData; |
8544e77a PP |
1323 | #else |
1324 | uint32_t send_size, send_final_zeroblock; | |
1325 | #endif | |
8523533c TK |
1326 | |
1327 | if ((clamd_options = string_nextinlist(&av_scanner_work, &sep, | |
1328 | clamd_options_buffer, | |
1329 | sizeof(clamd_options_buffer))) == NULL) { | |
1330 | /* no options supplied, use default options */ | |
1331 | clamd_options = clamd_options_default; | |
1332 | } | |
2376f2f5 TK |
1333 | if ((clamd_options2 = string_nextinlist(&av_scanner_work, &sep, |
1334 | clamd_options2_buffer, | |
1335 | sizeof(clamd_options2_buffer))) == NULL) { | |
1336 | clamd_options2 = clamd_options2_default; | |
1337 | } | |
8e669ac1 | 1338 | |
8544e77a PP |
1339 | if ((*clamd_options == '/') || (strcmpic(clamd_options2,US"local") == 0)) |
1340 | use_scan_command = TRUE; | |
1341 | else | |
1342 | use_scan_command = FALSE; | |
1343 | ||
94a18f28 PP |
1344 | /* See the discussion of response formats below to see why we really don't |
1345 | like colons in filenames when passing filenames to ClamAV. */ | |
1346 | if (use_scan_command && Ustrchr(eml_filename, ':')) { | |
1347 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1348 | "malware acl condition: clamd: local/SCAN mode incompatible with" \ | |
1349 | " : in path to email filename [%s]", eml_filename); | |
1350 | return DEFER; | |
1351 | } | |
1352 | ||
8523533c TK |
1353 | /* socket does not start with '/' -> network socket */ |
1354 | if (*clamd_options != '/') { | |
8e669ac1 | 1355 | |
8544e77a PP |
1356 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd |
1357 | * only supports AF_INET, but we should probably be looking to the | |
1358 | * future and rewriting this to be protocol-independent anyway. */ | |
1359 | ||
8523533c TK |
1360 | /* extract host and port part */ |
1361 | if( sscanf(CS clamd_options, "%s %u", hostname, &port) != 2 ) { | |
1362 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1363 | "malware acl condition: clamd: invalid socket '%s'", clamd_options); | |
1364 | return DEFER; | |
1365 | }; | |
8e669ac1 | 1366 | |
8523533c TK |
1367 | /* Lookup the host */ |
1368 | if((he = gethostbyname(CS hostname)) == 0) { | |
1369 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1370 | "malware acl condition: clamd: failed to lookup host '%s'", hostname); | |
1371 | return DEFER; | |
1372 | } | |
8e669ac1 | 1373 | |
8523533c | 1374 | in = *(struct in_addr *) he->h_addr_list[0]; |
8e669ac1 | 1375 | |
8523533c TK |
1376 | /* Open the ClamAV Socket */ |
1377 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
1378 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1379 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1380 | strerror(errno)); | |
1381 | return DEFER; | |
1382 | } | |
8e669ac1 | 1383 | |
8523533c | 1384 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { |
f1e894f3 | 1385 | (void)close(sock); |
8523533c TK |
1386 | log_write(0, LOG_MAIN|LOG_PANIC, |
1387 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1388 | inet_ntoa(in), port, strerror(errno)); | |
1389 | return DEFER; | |
1390 | } | |
2376f2f5 | 1391 | |
8544e77a PP |
1392 | } else { |
1393 | /* open the local socket */ | |
1394 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
1395 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1396 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1397 | strerror(errno)); | |
1398 | return DEFER; | |
1399 | } | |
2376f2f5 | 1400 | |
8544e77a PP |
1401 | server.sun_family = AF_UNIX; |
1402 | Ustrcpy(server.sun_path, clamd_options); | |
8e669ac1 | 1403 | |
8544e77a PP |
1404 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { |
1405 | (void)close(sock); | |
1406 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1407 | "malware acl condition: clamd: unable to connect to UNIX socket %s (%s)", | |
1408 | clamd_options, strerror(errno) ); | |
1409 | return DEFER; | |
1410 | } | |
1411 | } | |
8e669ac1 | 1412 | |
8544e77a PP |
1413 | /* have socket in variable "sock"; command to use is semi-independent of |
1414 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1415 | * domain socket, or explicitly told local) else we stream the data. | |
1416 | * How we stream the data depends upon how we were built. */ | |
2376f2f5 | 1417 | |
8544e77a | 1418 | if (!use_scan_command) { |
2376f2f5 | 1419 | |
8544e77a PP |
1420 | #ifdef WITH_OLD_CLAMAV_STREAM |
1421 | /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to | |
1422 | * that port on a second connection; then in the scan-method-neutral | |
1423 | * part, read the response back on the original connection. */ | |
2376f2f5 | 1424 | |
8544e77a PP |
1425 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n", |
1426 | scanner_name); | |
8e669ac1 | 1427 | |
8544e77a PP |
1428 | /* Pass the string to ClamAV (7 = "STREAM\n") */ |
1429 | if (send(sock, "STREAM\n", 7, 0) < 0) { | |
1430 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", | |
1431 | strerror(errno)); | |
1432 | (void)close(sock); | |
1433 | return DEFER; | |
1434 | } | |
1435 | memset(av_buffer2, 0, sizeof(av_buffer2)); | |
1436 | bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT); | |
8e669ac1 | 1437 | |
8544e77a PP |
1438 | if (bread < 0) { |
1439 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1440 | "malware acl condition: clamd: unable to read PORT from socket (%s)", | |
1441 | strerror(errno)); | |
1442 | (void)close(sock); | |
1443 | return DEFER; | |
1444 | } | |
8e669ac1 | 1445 | |
8544e77a PP |
1446 | if (bread == sizeof(av_buffer)) { |
1447 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1448 | "malware acl condition: clamd: buffer too small"); | |
1449 | (void)close(sock); | |
1450 | return DEFER; | |
1451 | } | |
8e669ac1 | 1452 | |
8544e77a PP |
1453 | if (!(*av_buffer2)) { |
1454 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1455 | "malware acl condition: clamd: ClamAV returned null"); | |
1456 | (void)close(sock); | |
1457 | return DEFER; | |
1458 | } | |
8e669ac1 | 1459 | |
8544e77a PP |
1460 | av_buffer2[bread] = '\0'; |
1461 | if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) { | |
1462 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1463 | "malware acl condition: clamd: Expected port information from clamd, got '%s'", av_buffer2); | |
1464 | (void)close(sock); | |
1465 | return DEFER; | |
1466 | }; | |
2376f2f5 | 1467 | |
8544e77a PP |
1468 | if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) { |
1469 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1470 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1471 | strerror(errno)); | |
1472 | (void)close(sock); | |
1473 | return DEFER; | |
1474 | } | |
384152a6 | 1475 | |
8544e77a PP |
1476 | if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { |
1477 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1478 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1479 | inet_ntoa(in), port, strerror(errno)); | |
1480 | (void)close(sockData); (void)close(sock); | |
1481 | return DEFER; | |
1482 | } | |
384152a6 | 1483 | |
8544e77a PP |
1484 | #define CLOSE_SOCKDATA (void)close(sockData) |
1485 | #else /* WITH_OLD_CLAMAV_STREAM not defined */ | |
1486 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> | |
1487 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1488 | chunk. */ | |
384152a6 | 1489 | |
8544e77a PP |
1490 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", |
1491 | scanner_name); | |
384152a6 | 1492 | |
8544e77a PP |
1493 | /* Pass the string to ClamAV (10 = "zINSTREAM\0") */ |
1494 | if (send(sock, "zINSTREAM", 10, 0) < 0) { | |
8523533c | 1495 | log_write(0, LOG_MAIN|LOG_PANIC, |
8544e77a PP |
1496 | "malware acl condition: clamd: unable to send zINSTREAM to socket (%s)", |
1497 | strerror(errno)); | |
1498 | (void)close(sock); | |
8523533c TK |
1499 | return DEFER; |
1500 | } | |
8e669ac1 | 1501 | |
8544e77a PP |
1502 | #define CLOSE_SOCKDATA /**/ |
1503 | #endif | |
8e669ac1 | 1504 | |
8544e77a PP |
1505 | /* calc file size */ |
1506 | clam_fd = open(CS eml_filename, O_RDONLY); | |
1507 | if (clam_fd == -1) { | |
8523533c | 1508 | log_write(0, LOG_MAIN|LOG_PANIC, |
8544e77a PP |
1509 | "malware acl condition: clamd: can't open spool file %s: %s", |
1510 | eml_filename, strerror(errno)); | |
1511 | CLOSE_SOCKDATA; (void)close(sock); | |
8523533c TK |
1512 | return DEFER; |
1513 | } | |
8544e77a PP |
1514 | fsize = lseek(clam_fd, 0, SEEK_END); |
1515 | if (fsize == -1) { | |
1516 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1517 | "malware acl condition: clamd: can't seek spool file %s: %s", | |
1518 | eml_filename, strerror(errno)); | |
1519 | CLOSE_SOCKDATA; (void)close(sock); | |
1520 | return DEFER; | |
1521 | } | |
1522 | lseek(clam_fd, 0, SEEK_SET); | |
8e669ac1 | 1523 | |
8544e77a PP |
1524 | clamav_fbuf = (uschar *) malloc (fsize); |
1525 | if (!clamav_fbuf) { | |
1526 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1527 | "malware acl condition: clamd: unable to allocate memory %u for file (%s)", | |
1528 | fsize, eml_filename); | |
1529 | CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd); | |
1530 | return DEFER; | |
1531 | } | |
8e669ac1 | 1532 | |
8544e77a PP |
1533 | result = read (clam_fd, clamav_fbuf, fsize); |
1534 | if (result == -1) { | |
1535 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1536 | "malware acl condition: clamd: can't read spool file %s: %s", | |
1537 | eml_filename, strerror(errno)); | |
1538 | CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd); | |
1539 | free(clamav_fbuf); | |
1540 | return DEFER; | |
1541 | } | |
1542 | (void)close(clam_fd); | |
8e669ac1 | 1543 | |
8544e77a PP |
1544 | /* send file body to socket */ |
1545 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1546 | if (send(sockData, clamav_fbuf, fsize, 0) < 0) { | |
1547 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1548 | "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port); | |
1549 | CLOSE_SOCKDATA; (void)close(sock); | |
1550 | free(clamav_fbuf); | |
1551 | return DEFER; | |
1552 | } | |
1553 | #else | |
1554 | send_size = htonl(fsize); | |
1555 | send_final_zeroblock = 0; | |
1556 | if ((send(sock, &send_size, sizeof(send_size), 0) < 0) || | |
1557 | (send(sock, clamav_fbuf, fsize, 0) < 0) || | |
1558 | (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
1559 | { | |
1560 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1561 | "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port); | |
1562 | (void)close(sock); | |
1563 | free(clamav_fbuf); | |
1564 | return DEFER; | |
1565 | } | |
1566 | #endif | |
8e669ac1 | 1567 | |
8544e77a PP |
1568 | free(clamav_fbuf); |
1569 | ||
1570 | CLOSE_SOCKDATA; | |
1571 | #undef CLOSE_SOCKDATA | |
1572 | ||
1573 | } else { /* use scan command */ | |
1574 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1575 | * scan-method-neutral part, read the response back */ | |
1576 | ||
1577 | /* ================================================================= */ | |
1578 | ||
1579 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1580 | which dates to when ClamAV needed us to break apart the email into the | |
1581 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1582 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1583 | doing this would actually have resulted in the mail attachments being | |
1584 | scanned twice, in the broken out files and from the original .eml. | |
1585 | Since ClamAV now handles emails (and has for quite some time) we can | |
1586 | just use the email file itself. */ | |
1587 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ | |
1588 | fits = string_format(file_name, sizeof(file_name), "SCAN %s\n", | |
1589 | eml_filename); | |
1590 | if (!fits) { | |
1591 | (void)close(sock); | |
1592 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1593 | "malware filename does not fit in buffer [malware_internal() clamd]"); | |
1594 | } | |
8e669ac1 | 1595 | |
8544e77a PP |
1596 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n", |
1597 | scanner_name, clamd_options); | |
8e669ac1 | 1598 | |
8544e77a PP |
1599 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) { |
1600 | (void)close(sock); | |
1601 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", | |
1602 | strerror(errno)); | |
1603 | return DEFER; | |
1604 | } | |
8e669ac1 | 1605 | |
8544e77a PP |
1606 | /* Do not shut down the socket for writing; a user report noted that |
1607 | * clamd 0.70 does not react well to this. */ | |
1608 | } | |
1609 | /* Commands have been sent, no matter which scan method or connection | |
1610 | * type we're using; now just read the result, independent of method. */ | |
8e669ac1 | 1611 | |
8523533c TK |
1612 | /* Read the result */ |
1613 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1614 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
f1e894f3 | 1615 | (void)close(sock); |
8523533c TK |
1616 | |
1617 | if (!(bread > 0)) { | |
1618 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1619 | "malware acl condition: clamd: unable to read from socket (%s)", | |
1620 | strerror(errno)); | |
1621 | return DEFER; | |
1622 | } | |
8e669ac1 | 1623 | |
8523533c TK |
1624 | if (bread == sizeof(av_buffer)) { |
1625 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1626 | "malware acl condition: clamd: buffer too small"); | |
1627 | return DEFER; | |
1628 | } | |
8e669ac1 | 1629 | |
94a18f28 PP |
1630 | /* Check the result. ClamAV returns one of two result formats. |
1631 | In the basic mode, the response is of the form: | |
1632 | infected: -> "<filename>: <virusname> FOUND" | |
1633 | not-infected: -> "<filename>: OK" | |
1634 | error: -> "<filename>: <errcode> ERROR | |
1635 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1636 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1637 | for the infected case. Compare: | |
1638 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1639 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1640 | ||
1641 | In the streaming case, clamd uses the filename "stream" which you should | |
1642 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1643 | client app will replace "stream" with the original filename before returning | |
1644 | results to stdout, but the trace shows the data). | |
1645 | ||
1646 | We will assume that the pathname passed to clamd from Exim does not contain | |
1647 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1648 | passing a filename to clamd). */ | |
8e669ac1 | 1649 | |
8523533c TK |
1650 | if (!(*av_buffer)) { |
1651 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1652 | "malware acl condition: clamd: ClamAV returned null"); | |
1653 | return DEFER; | |
1654 | } | |
8e669ac1 | 1655 | |
94a18f28 PP |
1656 | /* strip newline at the end (won't be present for zINSTREAM) |
1657 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1658 | this below, so double-check) */ | |
3c5cd616 | 1659 | p = av_buffer + Ustrlen(av_buffer) - 1; |
94a18f28 | 1660 | if (*p == '\n') *p = '\0'; |
3c5cd616 | 1661 | |
8544e77a PP |
1662 | DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer); |
1663 | ||
94a18f28 PP |
1664 | while (isspace(*--p) && (p > av_buffer)) |
1665 | *p = '\0'; | |
1666 | if (*p) ++p; | |
1667 | response_end = p; | |
1668 | ||
8523533c | 1669 | /* colon in returned output? */ |
94a18f28 | 1670 | if((p = Ustrchr(av_buffer,':')) == NULL) { |
8523533c | 1671 | log_write(0, LOG_MAIN|LOG_PANIC, |
94a18f28 | 1672 | "malware acl condition: clamd: ClamAV returned malformed result (missing colon): %s", |
8e669ac1 | 1673 | av_buffer); |
8523533c TK |
1674 | return DEFER; |
1675 | } | |
8e669ac1 | 1676 | |
3c5cd616 | 1677 | /* strip filename */ |
94a18f28 | 1678 | while (*p && isspace(*++p)) /**/; |
8523533c | 1679 | vname = p; |
94a18f28 PP |
1680 | |
1681 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1682 | but we should at least be resistant to it. */ | |
1683 | p = Ustrrchr(vname, ' '); | |
1684 | if (p) | |
1685 | result_tag = p + 1; | |
1686 | else | |
1687 | result_tag = vname; | |
1688 | ||
1689 | if (Ustrcmp(result_tag, "FOUND") == 0) { | |
1690 | /* p should still be the whitespace before the result_tag */ | |
1691 | while (isspace(*p)) --p; | |
1692 | *++p = '\0'; | |
1693 | /* Strip off the extended information too, which will be in parens | |
1694 | after the virus name, with no intervening whitespace. */ | |
1695 | if (*--p == ')') { | |
1696 | /* "(hash:size)", so previous '(' will do; if not found, we have | |
1697 | a curious virus name, but not an error. */ | |
1698 | p = Ustrrchr(vname, '('); | |
1699 | if (p) | |
1700 | *p = '\0'; | |
1701 | } | |
1702 | Ustrncpy(malware_name_buffer, vname, sizeof(malware_name_buffer)-1); | |
1703 | malware_name = malware_name_buffer; | |
1704 | DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name); | |
1705 | ||
1706 | } else if (Ustrcmp(result_tag, "ERROR") == 0) { | |
1707 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1708 | "malware acl condition: clamd: ClamAV returned: %s", | |
1709 | av_buffer); | |
1710 | return DEFER; | |
1711 | ||
1712 | } else if (Ustrcmp(result_tag, "OK") == 0) { | |
1713 | /* Everything should be OK */ | |
1714 | malware_name = NULL; | |
1715 | DEBUG(D_acl) debug_printf("Malware not found\n"); | |
1716 | ||
1717 | } else { | |
1718 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1719 | "malware acl condition: clamd: unparseable response from ClamAV: {%s}", | |
1720 | av_buffer); | |
1721 | return DEFER; | |
8523533c | 1722 | } |
94a18f28 PP |
1723 | |
1724 | } /* clamd */ | |
1725 | ||
8523533c | 1726 | /* ----------------------------------------------------------------------- */ |
8e669ac1 PH |
1727 | |
1728 | ||
8523533c TK |
1729 | /* "mksd" scanner type --------------------------------------------------- */ |
1730 | else if (strcmpic(scanner_name,US"mksd") == 0) { | |
1731 | uschar *mksd_options; | |
1732 | char *mksd_options_end; | |
1733 | uschar mksd_options_buffer[32]; | |
1734 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1735 | struct sockaddr_un server; | |
1736 | int sock; | |
1737 | int retval; | |
8e669ac1 | 1738 | |
8523533c TK |
1739 | if ((mksd_options = string_nextinlist(&av_scanner_work, &sep, |
1740 | mksd_options_buffer, | |
1741 | sizeof(mksd_options_buffer))) != NULL) { | |
1742 | mksd_maxproc = (int) strtol(CS mksd_options, &mksd_options_end, 10); | |
384152a6 TK |
1743 | if ((*mksd_options == '\0') || (*mksd_options_end != '\0') || |
1744 | (mksd_maxproc < 1) || (mksd_maxproc > 32)) { | |
8523533c TK |
1745 | log_write(0, LOG_MAIN|LOG_PANIC, |
1746 | "malware acl condition: mksd: invalid option '%s'", mksd_options); | |
1747 | return DEFER; | |
1748 | } | |
1749 | } | |
8e669ac1 | 1750 | |
8523533c TK |
1751 | /* open the mksd socket */ |
1752 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1753 | if (sock < 0) { | |
1754 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1755 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1756 | return DEFER; |
8523533c TK |
1757 | } |
1758 | server.sun_family = AF_UNIX; | |
1759 | Ustrcpy(server.sun_path, "/var/run/mksd/socket"); | |
1760 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1761 | (void)close(sock); |
8523533c TK |
1762 | log_write(0, LOG_MAIN|LOG_PANIC, |
1763 | "malware acl condition: unable to connect to mksd UNIX socket (/var/run/mksd/socket). errno=%d", errno); | |
1764 | return DEFER; | |
1765 | } | |
8e669ac1 | 1766 | |
8523533c | 1767 | malware_name = NULL; |
8e669ac1 | 1768 | |
8544e77a PP |
1769 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name); |
1770 | ||
1771 | retval = mksd_scan_packed(sock, eml_filename); | |
8e669ac1 | 1772 | |
8523533c TK |
1773 | if (retval != OK) |
1774 | return retval; | |
1775 | } | |
1776 | /* ----------------------------------------------------------------------- */ | |
1777 | ||
1778 | /* "unknown" scanner type ------------------------------------------------- */ | |
1779 | else { | |
1780 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1781 | "malware condition: unknown scanner type '%s'", scanner_name); | |
1782 | return DEFER; | |
1783 | }; | |
1784 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1785 | |
8523533c TK |
1786 | /* set "been here, done that" marker */ |
1787 | malware_ok = 1; | |
1788 | }; | |
1789 | ||
1790 | /* match virus name against pattern (caseless ------->----------v) */ | |
1791 | if ( (malware_name != NULL) && | |
1792 | (regex_match_and_setup(re, malware_name, 0, -1)) ) { | |
8544e77a | 1793 | DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name); |
8523533c TK |
1794 | return OK; |
1795 | } | |
1796 | else { | |
1797 | return FAIL; | |
1798 | }; | |
1799 | } | |
1800 | ||
1801 | ||
1802 | /* simple wrapper for reading lines from sockets */ | |
1803 | int recv_line(int sock, uschar *buffer, int size) { | |
1804 | uschar *p = buffer; | |
1805 | ||
1806 | memset(buffer,0,size); | |
1807 | /* read until \n */ | |
1808 | while(recv(sock,p,1,0) > -1) { | |
1809 | if ((p-buffer) > (size-2)) break; | |
1810 | if (*p == '\n') break; | |
1811 | if (*p != '\r') p++; | |
1812 | }; | |
1813 | *p = '\0'; | |
1814 | ||
1815 | return (p-buffer); | |
1816 | } | |
1817 | ||
1818 | ||
1819 | /* ============= private routines for the "mksd" scanner type ============== */ | |
1820 | ||
1821 | #include <sys/uio.h> | |
1822 | ||
8544e77a | 1823 | static int mksd_writev (int sock, struct iovec *iov, int iovcnt) |
8523533c TK |
1824 | { |
1825 | int i; | |
8e669ac1 | 1826 | |
8523533c TK |
1827 | for (;;) { |
1828 | do | |
1829 | i = writev (sock, iov, iovcnt); | |
1830 | while ((i < 0) && (errno == EINTR)); | |
1831 | if (i <= 0) { | |
1832 | close (sock); | |
1833 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1834 | "malware acl condition: unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
1835 | return -1; | |
1836 | } | |
8e669ac1 | 1837 | |
8523533c TK |
1838 | for (;;) |
1839 | if (i >= iov->iov_len) { | |
1840 | if (--iovcnt == 0) | |
1841 | return 0; | |
1842 | i -= iov->iov_len; | |
1843 | iov++; | |
1844 | } else { | |
1845 | iov->iov_len -= i; | |
1846 | iov->iov_base = CS iov->iov_base + i; | |
1847 | break; | |
1848 | } | |
1849 | } | |
1850 | } | |
1851 | ||
8544e77a | 1852 | static int mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size) |
8523533c TK |
1853 | { |
1854 | int offset = 0; | |
1855 | int i; | |
8e669ac1 | 1856 | |
8523533c TK |
1857 | do { |
1858 | if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) { | |
1859 | close (sock); | |
1860 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1861 | "malware acl condition: unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
1862 | return -1; | |
1863 | } | |
8e669ac1 | 1864 | |
8523533c TK |
1865 | offset += i; |
1866 | /* offset == av_buffer_size -> buffer full */ | |
1867 | if (offset == av_buffer_size) { | |
1868 | close (sock); | |
1869 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1870 | "malware acl condition: malformed reply received from mksd"); | |
1871 | return -1; | |
1872 | } | |
1873 | } while (av_buffer[offset-1] != '\n'); | |
8e669ac1 | 1874 | |
8523533c TK |
1875 | av_buffer[offset] = '\0'; |
1876 | return offset; | |
1877 | } | |
1878 | ||
8544e77a | 1879 | static int mksd_parse_line (char *line) |
8523533c TK |
1880 | { |
1881 | char *p; | |
8e669ac1 | 1882 | |
8523533c TK |
1883 | switch (*line) { |
1884 | case 'O': | |
1885 | /* OK */ | |
1886 | return OK; | |
1887 | case 'E': | |
1888 | case 'A': | |
1889 | /* ERR */ | |
1890 | if ((p = strchr (line, '\n')) != NULL) | |
1891 | (*p) = '\0'; | |
1892 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1893 | "malware acl condition: mksd scanner failed: %s", line); | |
1894 | return DEFER; | |
1895 | default: | |
1896 | /* VIR */ | |
1897 | if ((p = strchr (line, '\n')) != NULL) { | |
1898 | (*p) = '\0'; | |
1899 | if (((p-line) > 5) && ((p-line) < sizeof (malware_name_buffer)) && (line[3] == ' ')) | |
1900 | if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) { | |
1901 | (*p) = '\0'; | |
1902 | Ustrcpy (malware_name_buffer, line+4); | |
384152a6 | 1903 | malware_name = malware_name_buffer; |
8523533c TK |
1904 | return OK; |
1905 | } | |
1906 | } | |
1907 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1908 | "malware acl condition: malformed reply received from mksd: %s", line); | |
1909 | return DEFER; | |
1910 | } | |
1911 | } | |
1912 | ||
8544e77a | 1913 | static int mksd_scan_packed(int sock, uschar *scan_filename) |
8523533c | 1914 | { |
8544e77a | 1915 | struct iovec iov[3]; |
1ba28e2b | 1916 | const char *cmd = "MSQ\n"; |
8523533c | 1917 | uschar av_buffer[1024]; |
8e669ac1 | 1918 | |
1ba28e2b | 1919 | iov[0].iov_base = (void *) cmd; |
8523533c | 1920 | iov[0].iov_len = 3; |
8544e77a PP |
1921 | iov[1].iov_base = CS scan_filename; |
1922 | iov[1].iov_len = Ustrlen(scan_filename); | |
f1a29782 | 1923 | iov[2].iov_base = (void *) (cmd + 3); |
8544e77a PP |
1924 | iov[2].iov_len = 1; |
1925 | ||
1926 | if (mksd_writev (sock, iov, 3) < 0) | |
8523533c | 1927 | return DEFER; |
8e669ac1 | 1928 | |
8523533c TK |
1929 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0) |
1930 | return DEFER; | |
8e669ac1 | 1931 | |
8523533c | 1932 | close (sock); |
8e669ac1 | 1933 | |
8523533c TK |
1934 | return mksd_parse_line (CS av_buffer); |
1935 | } | |
1936 | ||
1937 | #endif |