Commit | Line | Data |
---|---|---|
73a46702 | 1 | /* $Cambridge: exim/src/src/malware.c,v 1.21 2010/06/07 00:12:42 pdp Exp $ */ |
8523533c TK |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */ | |
8 | /* License: GPL */ | |
9 | ||
10 | /* Code for calling virus (malware) scanners. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
13 | #ifdef WITH_CONTENT_SCAN | |
14 | ||
15 | /* declaration of private routines */ | |
8544e77a PP |
16 | static int mksd_scan_packed(int sock, uschar *scan_filename); |
17 | static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking); | |
8523533c TK |
18 | |
19 | /* SHUT_WR seems to be undefined on Unixware? */ | |
20 | #ifndef SHUT_WR | |
21 | #define SHUT_WR 1 | |
22 | #endif | |
23 | ||
a9ccd69a PH |
24 | |
25 | #define MALWARE_TIMEOUT 120 | |
26 | ||
27 | ||
8523533c TK |
28 | #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ |
29 | #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
30 | #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
31 | ||
2376f2f5 TK |
32 | #define DERR_READ_ERR (1<<0) /* read error */ |
33 | #define DERR_NOMEMORY (1<<2) /* no memory */ | |
34 | #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
35 | #define DERR_BAD_CALL (1<<15) /* wrong command */ | |
36 | ||
8e669ac1 | 37 | /* Routine to check whether a system is big- or litte-endian. |
8523533c TK |
38 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
39 | Needed for proper kavdaemon implementation. Sigh. */ | |
40 | #define BIG_MY_ENDIAN 0 | |
41 | #define LITTLE_MY_ENDIAN 1 | |
42 | int test_byte_order(void); | |
43 | int test_byte_order() { | |
44 | short int word = 0x0001; | |
45 | char *byte = (char *) &word; | |
46 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); | |
47 | } | |
48 | ||
49 | uschar malware_name_buffer[256]; | |
50 | int malware_ok = 0; | |
51 | ||
8544e77a PP |
52 | /* Gross hacks for the -bmalware option; perhaps we should just create |
53 | the scan directory normally for that case, but look into rigging up the | |
54 | needed header variables if not already set on the command-line? */ | |
55 | extern int spool_mbox_ok; | |
56 | extern uschar spooled_message_id[17]; | |
57 | ||
58 | /************************************************* | |
59 | * Scan an email for malware * | |
60 | *************************************************/ | |
61 | ||
62 | /* This is the normal interface for scanning an email, which doesn't need a | |
63 | filename; it's a wrapper around the malware_file function. | |
64 | ||
65 | Arguments: | |
66 | listptr the list of options to the "malware = ..." ACL condition | |
67 | ||
68 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
69 | where true means malware was found (condition applies) | |
70 | */ | |
8523533c | 71 | int malware(uschar **listptr) { |
8544e77a PP |
72 | uschar scan_filename[1024]; |
73 | BOOL fits; | |
74 | ||
75 | fits = string_format(scan_filename, sizeof(scan_filename), | |
76 | CS"%s/scan/%s/%s.eml", spool_directory, message_id, message_id); | |
77 | if (!fits) | |
78 | { | |
79 | log_write(0, LOG_MAIN|LOG_PANIC, | |
80 | "malware filename does not fit in buffer [malware()]"); | |
81 | return DEFER; | |
82 | } | |
83 | ||
84 | return malware_internal(listptr, scan_filename, FALSE); | |
85 | } | |
86 | ||
87 | ||
88 | /************************************************* | |
89 | * Scan a file for malware * | |
90 | *************************************************/ | |
91 | ||
92 | /* This is a test wrapper for scanning an email, which is not used in | |
93 | normal processing. Scan any file, using the Exim scanning interface. | |
94 | This function tampers with various global variables so is unsafe to use | |
95 | in any other context. | |
96 | ||
97 | Arguments: | |
98 | eml_filename a file holding the message to be scanned | |
99 | ||
100 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
101 | where true means malware was found (condition applies) | |
102 | */ | |
dbc4b90d PP |
103 | int |
104 | malware_in_file(uschar *eml_filename) { | |
8544e77a PP |
105 | uschar *scan_options[2]; |
106 | uschar message_id_buf[64]; | |
107 | int ret; | |
108 | ||
73a46702 | 109 | scan_options[0] = US"*"; |
8544e77a PP |
110 | scan_options[1] = NULL; |
111 | ||
112 | /* spool_mbox() assumes various parameters exist, when creating | |
113 | the relevant directory and the email within */ | |
114 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
73a46702 | 115 | "dummy-%d", pseudo_random_number(INT_MAX)); |
8544e77a | 116 | message_id = message_id_buf; |
73a46702 PP |
117 | sender_address = US"malware-sender@example.net"; |
118 | return_path = US""; | |
8544e77a | 119 | recipients_list = NULL; |
73a46702 | 120 | receive_add_recipient(US"malware-victim@example.net", -1); |
8544e77a PP |
121 | enable_dollar_recipients = TRUE; |
122 | ||
123 | ret = malware_internal(scan_options, eml_filename, TRUE); | |
124 | ||
73a46702 | 125 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
8544e77a PP |
126 | spool_mbox_ok = 1; |
127 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
128 | set, but if that changes, then it should apply to these tests too */ | |
129 | unspool_mbox(); | |
130 | ||
131 | return ret; | |
132 | } | |
133 | ||
134 | ||
135 | /************************************************* | |
136 | * Scan content for malware * | |
137 | *************************************************/ | |
138 | ||
139 | /* This is an internal interface for scanning an email; the normal interface | |
140 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
141 | ||
142 | Arguments: | |
143 | listptr the list of options to the "malware = ..." ACL condition | |
144 | eml_filename the file holding the email to be scanned | |
145 | faking whether or not we're faking this up for the -bmalware test | |
146 | ||
147 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
148 | where true means malware was found (condition applies) | |
149 | */ | |
150 | static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking) { | |
8523533c TK |
151 | int sep = 0; |
152 | uschar *list = *listptr; | |
153 | uschar *av_scanner_work = av_scanner; | |
154 | uschar *scanner_name; | |
155 | uschar scanner_name_buffer[16]; | |
156 | uschar *malware_regex; | |
157 | uschar malware_regex_buffer[64]; | |
158 | uschar malware_regex_default[] = ".+"; | |
f7b63901 | 159 | unsigned long mbox_size; |
8523533c TK |
160 | FILE *mbox_file; |
161 | int roffset; | |
162 | const pcre *re; | |
163 | const uschar *rerror; | |
8e669ac1 | 164 | |
8523533c | 165 | /* make sure the eml mbox file is spooled up */ |
8544e77a | 166 | mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL); |
8523533c TK |
167 | if (mbox_file == NULL) { |
168 | /* error while spooling */ | |
169 | log_write(0, LOG_MAIN|LOG_PANIC, | |
170 | "malware acl condition: error while creating mbox spool file"); | |
8e669ac1 | 171 | return DEFER; |
8523533c TK |
172 | }; |
173 | /* none of our current scanners need the mbox | |
174 | file as a stream, so we can close it right away */ | |
f1e894f3 | 175 | (void)fclose(mbox_file); |
8e669ac1 | 176 | |
8523533c TK |
177 | /* extract the malware regex to match against from the option list */ |
178 | if ((malware_regex = string_nextinlist(&list, &sep, | |
179 | malware_regex_buffer, | |
180 | sizeof(malware_regex_buffer))) != NULL) { | |
8e669ac1 | 181 | |
8523533c | 182 | /* parse 1st option */ |
8e669ac1 | 183 | if ( (strcmpic(malware_regex,US"false") == 0) || |
8523533c TK |
184 | (Ustrcmp(malware_regex,"0") == 0) ) { |
185 | /* explicitly no matching */ | |
186 | return FAIL; | |
187 | }; | |
8e669ac1 | 188 | |
8523533c | 189 | /* special cases (match anything except empty) */ |
8e669ac1 PH |
190 | if ( (strcmpic(malware_regex,US"true") == 0) || |
191 | (Ustrcmp(malware_regex,"*") == 0) || | |
8523533c TK |
192 | (Ustrcmp(malware_regex,"1") == 0) ) { |
193 | malware_regex = malware_regex_default; | |
194 | }; | |
195 | } | |
196 | else { | |
197 | /* empty means "don't match anything" */ | |
198 | return FAIL; | |
199 | }; | |
200 | ||
ee873c8c TK |
201 | /* Reset sep that is set by previous string_nextinlist() call */ |
202 | sep = 0; | |
203 | ||
8523533c TK |
204 | /* compile the regex, see if it works */ |
205 | re = pcre_compile(CS malware_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
206 | if (re == NULL) { | |
207 | log_write(0, LOG_MAIN|LOG_PANIC, | |
208 | "malware acl condition: regular expression error in '%s': %s at offset %d", malware_regex, rerror, roffset); | |
209 | return DEFER; | |
210 | }; | |
211 | ||
212 | /* if av_scanner starts with a dollar, expand it first */ | |
213 | if (*av_scanner == '$') { | |
214 | av_scanner_work = expand_string(av_scanner); | |
215 | if (av_scanner_work == NULL) { | |
216 | log_write(0, LOG_MAIN|LOG_PANIC, | |
217 | "malware acl condition: av_scanner starts with $, but expansion failed: %s", expand_string_message); | |
218 | return DEFER; | |
219 | } | |
220 | else { | |
221 | debug_printf("Expanded av_scanner global: %s\n", av_scanner_work); | |
222 | /* disable result caching in this case */ | |
223 | malware_name = NULL; | |
224 | malware_ok = 0; | |
225 | }; | |
226 | } | |
227 | ||
228 | /* Do not scan twice. */ | |
229 | if (malware_ok == 0) { | |
230 | ||
231 | /* find the scanner type from the av_scanner option */ | |
232 | if ((scanner_name = string_nextinlist(&av_scanner_work, &sep, | |
233 | scanner_name_buffer, | |
234 | sizeof(scanner_name_buffer))) == NULL) { | |
235 | /* no scanner given */ | |
236 | log_write(0, LOG_MAIN|LOG_PANIC, | |
237 | "malware acl condition: av_scanner configuration variable is empty"); | |
238 | return DEFER; | |
239 | }; | |
8e669ac1 | 240 | |
e5496194 TK |
241 | /* "f-protd" scanner type ----------------------------------------------- */ |
242 | if (strcmpic(scanner_name, US"f-protd") == 0) { | |
243 | uschar *fp_options, *fp_scan_option; | |
244 | uschar fp_scan_option_buffer[1024]; | |
245 | uschar fp_options_buffer[1024]; | |
246 | uschar fp_options_default[] = "localhost 10200-10204"; | |
247 | uschar hostname[256]; | |
248 | unsigned int port, portlow, porthigh, connect_ok=0, detected=0, par_count = 0; | |
249 | struct hostent *he; | |
250 | struct in_addr in; | |
251 | int sock; | |
252 | uschar scanrequest[2048], buf[32768], *strhelper, *strhelper2; | |
253 | ||
254 | if ((fp_options = string_nextinlist(&av_scanner_work, &sep, | |
255 | fp_options_buffer, sizeof(fp_options_buffer))) == NULL) { | |
256 | /* no options supplied, use default options */ | |
257 | fp_options = fp_options_default; | |
258 | }; | |
259 | ||
260 | /* extract host and port part */ | |
261 | if ( sscanf(CS fp_options, "%s %u-%u", hostname, &portlow, &porthigh) != 3 ) { | |
262 | if ( sscanf(CS fp_options, "%s %u", hostname, &portlow) != 2 ) { | |
263 | log_write(0, LOG_MAIN|LOG_PANIC, | |
264 | "malware acl condition: f-protd: invalid socket '%s'", fp_options); | |
265 | return DEFER; | |
266 | } | |
267 | porthigh = portlow; | |
268 | } | |
269 | ||
270 | /* Lookup the host */ | |
271 | if((he = gethostbyname(CS hostname)) == 0) { | |
272 | log_write(0, LOG_MAIN|LOG_PANIC, | |
273 | "malware acl condition: f-protd: failed to lookup host '%s'", hostname); | |
274 | return DEFER; | |
275 | } | |
276 | ||
277 | in = *(struct in_addr *) he->h_addr_list[0]; | |
278 | port = portlow; | |
279 | ||
280 | ||
281 | /* Open the f-protd TCP socket */ | |
282 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
283 | log_write(0, LOG_MAIN|LOG_PANIC, | |
284 | "malware acl condition: f-protd: unable to acquire socket (%s)", | |
285 | strerror(errno)); | |
286 | return DEFER; | |
287 | } | |
288 | ||
289 | /* Try to connect to all portslow-high until connection is established */ | |
290 | for (port = portlow; !connect_ok && port < porthigh; port++) { | |
291 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0) { | |
292 | connect_ok = 1; | |
293 | } | |
294 | } | |
295 | ||
296 | if ( !connect_ok ) { | |
297 | log_write(0, LOG_MAIN|LOG_PANIC, | |
298 | "malware acl condition: f-protd: connection to %s, port %u-%u failed (%s)", | |
299 | inet_ntoa(in), portlow, porthigh, strerror(errno)); | |
300 | (void)close(sock); | |
301 | return DEFER; | |
302 | } | |
303 | ||
8544e77a PP |
304 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name); |
305 | (void)string_format(scanrequest, 1024, CS"GET %s", eml_filename); | |
e5496194 TK |
306 | |
307 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, | |
308 | fp_scan_option_buffer, sizeof(fp_scan_option_buffer))) != NULL) { | |
309 | if ( par_count ) { | |
310 | Ustrcat(scanrequest, "%20"); | |
311 | } else { | |
312 | Ustrcat(scanrequest, "?"); | |
313 | } | |
314 | Ustrcat(scanrequest, fp_scan_option); | |
315 | par_count++; | |
316 | } | |
317 | Ustrcat(scanrequest, " HTTP/1.0\r\n\r\n"); | |
318 | ||
319 | /* send scan request */ | |
320 | if (send(sock, &scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
321 | (void)close(sock); | |
322 | log_write(0, LOG_MAIN|LOG_PANIC, | |
323 | "malware acl condition: f-protd: unable to send command to socket (%s)", scanrequest); | |
324 | return DEFER; | |
325 | } | |
326 | ||
327 | /* We get a lot of empty lines, so we need this hack to check for any data at all */ | |
328 | while( recv(sock, buf, 1, MSG_PEEK) > 0 ) { | |
329 | if ( recv_line(sock, buf, 32768) > 0) { | |
330 | if ( Ustrstr(buf, US"<detected type=\"") != NULL ) { | |
331 | detected = 1; | |
332 | } else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) { | |
7156b1ef | 333 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) { |
e5496194 TK |
334 | *strhelper2 = '\0'; |
335 | Ustrcpy(malware_name_buffer, strhelper + 6); | |
336 | } | |
337 | } else if ( Ustrstr(buf, US"<summary code=\"") ) { | |
338 | if ( Ustrstr(buf, US"<summary code=\"11\">") ) { | |
339 | malware_name = malware_name_buffer; | |
340 | } else { | |
341 | malware_name = NULL; | |
342 | } | |
343 | } | |
344 | } | |
345 | } | |
346 | (void)close(sock); | |
347 | } | |
384152a6 TK |
348 | /* "drweb" scanner type ----------------------------------------------- */ |
349 | /* v0.1 - added support for tcp sockets */ | |
350 | /* v0.0 - initial release -- support for unix sockets */ | |
e5496194 | 351 | else if (strcmpic(scanner_name,US"drweb") == 0) { |
384152a6 TK |
352 | uschar *drweb_options; |
353 | uschar drweb_options_buffer[1024]; | |
354 | uschar drweb_options_default[] = "/usr/local/drweb/run/drwebd.sock"; | |
355 | struct sockaddr_un server; | |
356 | int sock, result, ovector[30]; | |
357 | unsigned int port, fsize; | |
358 | uschar tmpbuf[1024], *drweb_fbuf; | |
384152a6 TK |
359 | uschar drweb_match_string[128]; |
360 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
361 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
362 | unsigned long bread; | |
363 | uschar hostname[256]; | |
364 | struct hostent *he; | |
365 | struct in_addr in; | |
366 | pcre *drweb_re; | |
367 | ||
368 | if ((drweb_options = string_nextinlist(&av_scanner_work, &sep, | |
369 | drweb_options_buffer, sizeof(drweb_options_buffer))) == NULL) { | |
370 | /* no options supplied, use default options */ | |
371 | drweb_options = drweb_options_default; | |
372 | }; | |
373 | ||
374 | if (*drweb_options != '/') { | |
375 | ||
376 | /* extract host and port part */ | |
377 | if( sscanf(CS drweb_options, "%s %u", hostname, &port) != 2 ) { | |
378 | log_write(0, LOG_MAIN|LOG_PANIC, | |
379 | "malware acl condition: drweb: invalid socket '%s'", drweb_options); | |
380 | return DEFER; | |
381 | } | |
382 | ||
383 | /* Lookup the host */ | |
384 | if((he = gethostbyname(CS hostname)) == 0) { | |
385 | log_write(0, LOG_MAIN|LOG_PANIC, | |
386 | "malware acl condition: drweb: failed to lookup host '%s'", hostname); | |
387 | return DEFER; | |
388 | } | |
389 | ||
390 | in = *(struct in_addr *) he->h_addr_list[0]; | |
391 | ||
392 | /* Open the drwebd TCP socket */ | |
393 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
394 | log_write(0, LOG_MAIN|LOG_PANIC, | |
395 | "malware acl condition: drweb: unable to acquire socket (%s)", | |
396 | strerror(errno)); | |
397 | return DEFER; | |
398 | } | |
399 | ||
400 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { | |
f1e894f3 | 401 | (void)close(sock); |
384152a6 TK |
402 | log_write(0, LOG_MAIN|LOG_PANIC, |
403 | "malware acl condition: drweb: connection to %s, port %u failed (%s)", | |
404 | inet_ntoa(in), port, strerror(errno)); | |
405 | return DEFER; | |
406 | } | |
407 | ||
408 | /* prepare variables */ | |
409 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
410 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
384152a6 TK |
411 | |
412 | /* calc file size */ | |
8544e77a | 413 | drweb_fd = open(CS eml_filename, O_RDONLY); |
384152a6 | 414 | if (drweb_fd == -1) { |
f1e894f3 | 415 | (void)close(sock); |
384152a6 TK |
416 | log_write(0, LOG_MAIN|LOG_PANIC, |
417 | "malware acl condition: drweb: can't open spool file %s: %s", | |
8544e77a | 418 | eml_filename, strerror(errno)); |
384152a6 TK |
419 | return DEFER; |
420 | } | |
421 | fsize = lseek(drweb_fd, 0, SEEK_END); | |
422 | if (fsize == -1) { | |
f1e894f3 PH |
423 | (void)close(sock); |
424 | (void)close(drweb_fd); | |
384152a6 TK |
425 | log_write(0, LOG_MAIN|LOG_PANIC, |
426 | "malware acl condition: drweb: can't seek spool file %s: %s", | |
8544e77a | 427 | eml_filename, strerror(errno)); |
384152a6 TK |
428 | return DEFER; |
429 | } | |
430 | drweb_slen = htonl(fsize); | |
431 | lseek(drweb_fd, 0, SEEK_SET); | |
432 | ||
8544e77a PP |
433 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s %u]\n", |
434 | scanner_name, hostname, port); | |
435 | ||
384152a6 TK |
436 | /* send scan request */ |
437 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
438 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
439 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
440 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) { | |
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: unable to send commands to socket (%s)", drweb_options); | |
445 | return DEFER; | |
446 | } | |
447 | ||
448 | drweb_fbuf = (uschar *) malloc (fsize); | |
449 | if (!drweb_fbuf) { | |
f1e894f3 PH |
450 | (void)close(sock); |
451 | (void)close(drweb_fd); | |
384152a6 TK |
452 | log_write(0, LOG_MAIN|LOG_PANIC, |
453 | "malware acl condition: drweb: unable to allocate memory %u for file (%s)", | |
8544e77a | 454 | fsize, eml_filename); |
384152a6 TK |
455 | return DEFER; |
456 | } | |
457 | ||
458 | result = read (drweb_fd, drweb_fbuf, fsize); | |
459 | if (result == -1) { | |
f1e894f3 PH |
460 | (void)close(sock); |
461 | (void)close(drweb_fd); | |
384152a6 TK |
462 | free(drweb_fbuf); |
463 | log_write(0, LOG_MAIN|LOG_PANIC, | |
464 | "malware acl condition: drweb: can't read spool file %s: %s", | |
8544e77a | 465 | eml_filename, strerror(errno)); |
384152a6 TK |
466 | return DEFER; |
467 | } | |
f1e894f3 | 468 | (void)close(drweb_fd); |
384152a6 TK |
469 | |
470 | /* send file body to socket */ | |
471 | if (send(sock, drweb_fbuf, fsize, 0) < 0) { | |
f1e894f3 | 472 | (void)close(sock); |
384152a6 TK |
473 | free(drweb_fbuf); |
474 | log_write(0, LOG_MAIN|LOG_PANIC, | |
475 | "malware acl condition: drweb: unable to send file body to socket (%s)", drweb_options); | |
476 | return DEFER; | |
477 | } | |
f1e894f3 | 478 | (void)close(drweb_fd); |
384152a6 TK |
479 | } |
480 | else { | |
481 | /* open the drwebd UNIX socket */ | |
482 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
483 | if (sock < 0) { | |
484 | log_write(0, LOG_MAIN|LOG_PANIC, | |
485 | "malware acl condition: drweb: can't open UNIX socket"); | |
486 | return DEFER; | |
487 | } | |
488 | server.sun_family = AF_UNIX; | |
489 | Ustrcpy(server.sun_path, drweb_options); | |
490 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 491 | (void)close(sock); |
384152a6 TK |
492 | log_write(0, LOG_MAIN|LOG_PANIC, |
493 | "malware acl condition: drweb: unable to connect to socket (%s). errno=%d", drweb_options, errno); | |
494 | return DEFER; | |
495 | } | |
496 | ||
497 | /* prepare variables */ | |
498 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
499 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
8544e77a PP |
500 | drweb_slen = htonl(Ustrlen(eml_filename)); |
501 | ||
502 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n", | |
503 | scanner_name, drweb_options); | |
384152a6 TK |
504 | |
505 | /* send scan request */ | |
506 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
507 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
508 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
8544e77a | 509 | (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || |
384152a6 | 510 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) { |
f1e894f3 | 511 | (void)close(sock); |
384152a6 TK |
512 | log_write(0, LOG_MAIN|LOG_PANIC, |
513 | "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options); | |
514 | return DEFER; | |
515 | } | |
516 | } | |
517 | ||
518 | /* wait for result */ | |
519 | if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) { | |
f1e894f3 | 520 | (void)close(sock); |
384152a6 TK |
521 | log_write(0, LOG_MAIN|LOG_PANIC, |
522 | "malware acl condition: drweb: unable to read return code"); | |
523 | return DEFER; | |
524 | } | |
525 | drweb_rc = ntohl(drweb_rc); | |
526 | ||
527 | if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) { | |
f1e894f3 | 528 | (void)close(sock); |
384152a6 TK |
529 | log_write(0, LOG_MAIN|LOG_PANIC, |
530 | "malware acl condition: drweb: unable to read the number of viruses"); | |
531 | return DEFER; | |
532 | } | |
533 | drweb_vnum = ntohl(drweb_vnum); | |
534 | ||
535 | /* "virus(es) found" if virus number is > 0 */ | |
536 | if (drweb_vnum) | |
537 | { | |
538 | int i; | |
539 | uschar pre_malware_nb[256]; | |
540 | ||
541 | malware_name = malware_name_buffer; | |
542 | ||
543 | /* setup default virus name */ | |
544 | Ustrcpy(malware_name_buffer,"unknown"); | |
545 | ||
546 | /* read and concatenate virus names into one string */ | |
547 | for (i=0;i<drweb_vnum;i++) | |
548 | { | |
549 | /* read the size of report */ | |
550 | if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) { | |
f1e894f3 | 551 | (void)close(sock); |
384152a6 TK |
552 | log_write(0, LOG_MAIN|LOG_PANIC, |
553 | "malware acl condition: drweb: cannot read report size"); | |
554 | return DEFER; | |
555 | }; | |
556 | drweb_slen = ntohl(drweb_slen); | |
557 | ||
558 | /* read report body */ | |
559 | if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) { | |
f1e894f3 | 560 | (void)close(sock); |
384152a6 TK |
561 | log_write(0, LOG_MAIN|LOG_PANIC, |
562 | "malware acl condition: drweb: cannot read report string"); | |
563 | return DEFER; | |
564 | }; | |
565 | tmpbuf[drweb_slen] = '\0'; | |
566 | ||
567 | /* set up match regex, depends on retcode */ | |
568 | Ustrcpy(drweb_match_string, "infected\\swith\\s*(.+?)$"); | |
569 | ||
570 | drweb_re = pcre_compile( CS drweb_match_string, | |
571 | PCRE_COPT, | |
572 | (const char **)&rerror, | |
573 | &roffset, | |
574 | NULL ); | |
575 | ||
576 | /* try matcher on the line, grab substring */ | |
577 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
578 | if (result >= 2) { | |
579 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS pre_malware_nb, 255); | |
580 | } | |
581 | /* the first name we just copy to malware_name */ | |
582 | if (i==0) | |
583 | Ustrcpy(CS malware_name_buffer, CS pre_malware_nb); | |
584 | else { | |
585 | /* concatenate each new virus name to previous */ | |
586 | int slen = Ustrlen(malware_name_buffer); | |
587 | if (slen < (slen+Ustrlen(pre_malware_nb))) { | |
588 | Ustrcat(malware_name_buffer, "/"); | |
589 | Ustrcat(malware_name_buffer, pre_malware_nb); | |
590 | } | |
591 | } | |
592 | } | |
593 | } | |
594 | else { | |
1ba28e2b | 595 | const char *drweb_s = NULL; |
384152a6 TK |
596 | |
597 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
598 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
599 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
600 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
601 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
602 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
603 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
604 | * and others are ignored */ | |
605 | if (drweb_s) { | |
606 | log_write(0, LOG_MAIN|LOG_PANIC, | |
607 | "malware acl condition: drweb: drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s); | |
f1e894f3 | 608 | (void)close(sock); |
384152a6 TK |
609 | return DEFER; |
610 | } | |
611 | /* no virus found */ | |
612 | malware_name = NULL; | |
613 | }; | |
f1e894f3 | 614 | (void)close(sock); |
384152a6 TK |
615 | } |
616 | /* ----------------------------------------------------------------------- */ | |
8523533c TK |
617 | else if (strcmpic(scanner_name,US"aveserver") == 0) { |
618 | uschar *kav_options; | |
619 | uschar kav_options_buffer[1024]; | |
620 | uschar kav_options_default[] = "/var/run/aveserver"; | |
621 | uschar buf[32768]; | |
8523533c TK |
622 | struct sockaddr_un server; |
623 | int sock; | |
7e274b4b | 624 | int result; |
8e669ac1 | 625 | |
8523533c TK |
626 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
627 | kav_options_buffer, | |
628 | sizeof(kav_options_buffer))) == NULL) { | |
629 | /* no options supplied, use default options */ | |
630 | kav_options = kav_options_default; | |
631 | }; | |
8e669ac1 | 632 | |
8523533c TK |
633 | /* open the aveserver socket */ |
634 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
635 | if (sock < 0) { | |
636 | log_write(0, LOG_MAIN|LOG_PANIC, | |
637 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 638 | return DEFER; |
8523533c TK |
639 | } |
640 | server.sun_family = AF_UNIX; | |
641 | Ustrcpy(server.sun_path, kav_options); | |
642 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 643 | (void)close(sock); |
8523533c TK |
644 | log_write(0, LOG_MAIN|LOG_PANIC, |
645 | "malware acl condition: unable to connect to aveserver UNIX socket (%s). errno=%d", kav_options, errno); | |
646 | return DEFER; | |
647 | } | |
8e669ac1 | 648 | |
8523533c TK |
649 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
650 | recv_line(sock, buf, 32768); | |
651 | ||
652 | if (buf[0] != '2') { | |
653 | /* aveserver is having problems */ | |
f1e894f3 | 654 | (void)close(sock); |
8523533c TK |
655 | log_write(0, LOG_MAIN|LOG_PANIC, |
656 | "malware acl condition: aveserver is unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
657 | return DEFER; | |
658 | }; | |
8e669ac1 | 659 | |
8523533c | 660 | /* prepare our command */ |
8544e77a PP |
661 | (void)string_format(buf, 32768, "SCAN bPQRSTUW %s\r\n", eml_filename); |
662 | ||
663 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name); | |
8e669ac1 | 664 | |
8523533c TK |
665 | /* and send it */ |
666 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 667 | (void)close(sock); |
8523533c TK |
668 | log_write(0, LOG_MAIN|LOG_PANIC, |
669 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
670 | return DEFER; | |
671 | } | |
8e669ac1 | 672 | |
8523533c | 673 | malware_name = NULL; |
7e274b4b | 674 | result = 0; |
8523533c TK |
675 | /* read response lines, find malware name and final response */ |
676 | while (recv_line(sock, buf, 32768) > 0) { | |
677 | debug_printf("aveserver: %s\n", buf); | |
7e274b4b TK |
678 | if (buf[0] == '2') { |
679 | break; | |
680 | } else if (buf[0] == '5') { | |
681 | /* aveserver is having problems */ | |
682 | log_write(0, LOG_MAIN|LOG_PANIC, | |
8544e77a PP |
683 | "malware acl condition: unable to scan file %s (Responded: %s).", |
684 | eml_filename, buf); | |
7e274b4b TK |
685 | result = DEFER; |
686 | break; | |
687 | } else if (Ustrncmp(buf,"322",3) == 0) { | |
8523533c TK |
688 | uschar *p = Ustrchr(&buf[4],' '); |
689 | *p = '\0'; | |
690 | Ustrcpy(malware_name_buffer,&buf[4]); | |
691 | malware_name = malware_name_buffer; | |
7e274b4b TK |
692 | }; |
693 | } | |
694 | ||
695 | /* prepare our command */ | |
b07e6aa3 | 696 | (void)string_format(buf, 32768, "quit\r\n"); |
7e274b4b TK |
697 | |
698 | /* and send it */ | |
699 | if (send(sock, buf, Ustrlen(buf), 0) < 0) { | |
f1e894f3 | 700 | (void)close(sock); |
7e274b4b TK |
701 | log_write(0, LOG_MAIN|LOG_PANIC, |
702 | "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options); | |
703 | return DEFER; | |
8523533c TK |
704 | } |
705 | ||
7e274b4b TK |
706 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
707 | recv_line(sock, buf, 32768); | |
708 | ||
709 | if (buf[0] != '2') { | |
710 | /* aveserver is having problems */ | |
f1e894f3 | 711 | (void)close(sock); |
7e274b4b TK |
712 | log_write(0, LOG_MAIN|LOG_PANIC, |
713 | "malware acl condition: unable to quit aveserver dialogue (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ); | |
714 | return DEFER; | |
715 | }; | |
716 | ||
f1e894f3 | 717 | (void)close(sock); |
7e274b4b TK |
718 | |
719 | if (result == DEFER) return DEFER; | |
8523533c TK |
720 | } |
721 | /* "fsecure" scanner type ------------------------------------------------- */ | |
722 | else if (strcmpic(scanner_name,US"fsecure") == 0) { | |
723 | uschar *fsecure_options; | |
724 | uschar fsecure_options_buffer[1024]; | |
725 | uschar fsecure_options_default[] = "/var/run/.fsav"; | |
726 | struct sockaddr_un server; | |
727 | int sock, i, j, bread = 0; | |
728 | uschar file_name[1024]; | |
729 | uschar av_buffer[1024]; | |
730 | pcre *fs_inf; | |
f7b63901 PH |
731 | static uschar *cmdoptions[] = { US"CONFIGURE\tARCHIVE\t1\n", |
732 | US"CONFIGURE\tTIMEOUT\t0\n", | |
733 | US"CONFIGURE\tMAXARCH\t5\n", | |
734 | US"CONFIGURE\tMIME\t1\n" }; | |
8e669ac1 | 735 | |
8523533c TK |
736 | malware_name = NULL; |
737 | if ((fsecure_options = string_nextinlist(&av_scanner_work, &sep, | |
738 | fsecure_options_buffer, | |
8e669ac1 | 739 | sizeof(fsecure_options_buffer))) == NULL) { |
8523533c TK |
740 | /* no options supplied, use default options */ |
741 | fsecure_options = fsecure_options_default; | |
742 | }; | |
8e669ac1 | 743 | |
8523533c TK |
744 | /* open the fsecure socket */ |
745 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
746 | if (sock < 0) { | |
747 | log_write(0, LOG_MAIN|LOG_PANIC, | |
748 | "malware acl condition: unable to open fsecure socket %s (%s)", | |
749 | fsecure_options, strerror(errno)); | |
750 | return DEFER; | |
751 | } | |
752 | server.sun_family = AF_UNIX; | |
753 | Ustrcpy(server.sun_path, fsecure_options); | |
754 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 755 | (void)close(sock); |
8523533c TK |
756 | log_write(0, LOG_MAIN|LOG_PANIC, |
757 | "malware acl condition: unable to connect to fsecure socket %s (%s)", | |
758 | fsecure_options, strerror(errno)); | |
759 | return DEFER; | |
760 | } | |
8e669ac1 | 761 | |
8544e77a PP |
762 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
763 | scanner_name, fsecure_options); | |
764 | ||
8523533c TK |
765 | /* pass options */ |
766 | memset(av_buffer, 0, sizeof(av_buffer)); | |
767 | for (i=0; i != 4; i++) { | |
768 | /* debug_printf("send option \"%s\"",cmdoptions[i]); */ | |
769 | if (write(sock, cmdoptions[i], Ustrlen(cmdoptions[i])) < 0) { | |
f1e894f3 | 770 | (void)close(sock); |
8523533c TK |
771 | log_write(0, LOG_MAIN|LOG_PANIC, |
772 | "malware acl condition: unable to write fsecure option %d to %s (%s)", | |
773 | i, fsecure_options, strerror(errno)); | |
8e669ac1 | 774 | return DEFER; |
8523533c | 775 | }; |
8e669ac1 | 776 | |
a9ccd69a | 777 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
8523533c TK |
778 | if (bread >0) av_buffer[bread]='\0'; |
779 | if (bread < 0) { | |
f1e894f3 | 780 | (void)close(sock); |
8523533c TK |
781 | log_write(0, LOG_MAIN|LOG_PANIC, |
782 | "malware acl condition: unable to read fsecure answer %d (%s)", i, strerror(errno)); | |
783 | return DEFER; | |
784 | }; | |
785 | for (j=0;j<bread;j++) if((av_buffer[j]=='\r')||(av_buffer[j]=='\n')) av_buffer[j] ='@'; | |
786 | /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */ | |
787 | /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */ | |
788 | }; | |
8e669ac1 | 789 | |
8523533c | 790 | /* pass the mailfile to fsecure */ |
8544e77a | 791 | (void)string_format(file_name,1024,"SCAN\t%s\n", eml_filename); |
8523533c TK |
792 | /* debug_printf("send scan %s",file_name); */ |
793 | if (write(sock, file_name, Ustrlen(file_name)) < 0) { | |
f1e894f3 | 794 | (void)close(sock); |
8523533c TK |
795 | log_write(0, LOG_MAIN|LOG_PANIC, |
796 | "malware acl condition: unable to write fsecure scan to %s (%s)", | |
797 | fsecure_options, strerror(errno)); | |
798 | return DEFER; | |
799 | }; | |
8e669ac1 | 800 | |
8523533c TK |
801 | /* set up match */ |
802 | /* todo also SUSPICION\t */ | |
803 | fs_inf = pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
8e669ac1 | 804 | |
8523533c TK |
805 | /* read report, linewise */ |
806 | do { | |
807 | int ovector[30]; | |
808 | i = 0; | |
809 | memset(av_buffer, 0, sizeof(av_buffer)); | |
810 | do { | |
a9ccd69a | 811 | bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT); |
8523533c | 812 | if (bread < 0) { |
f1e894f3 | 813 | (void)close(sock); |
8523533c TK |
814 | log_write(0, LOG_MAIN|LOG_PANIC, |
815 | "malware acl condition: unable to read fsecure result (%s)", strerror(errno)); | |
816 | return DEFER; | |
817 | }; | |
818 | i++; | |
819 | } | |
820 | while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n')); | |
821 | av_buffer[i-1] = '\0'; | |
822 | /* debug_printf("got line \"%s\"\n",av_buffer); */ | |
8e669ac1 | 823 | |
8523533c TK |
824 | /* Really search for virus again? */ |
825 | if (malware_name == NULL) { | |
826 | /* try matcher on the line, grab substring */ | |
827 | i = pcre_exec(fs_inf, NULL, CS av_buffer, Ustrlen(av_buffer), 0, 0, ovector, 30); | |
828 | if (i >= 2) { | |
829 | /* Got it */ | |
830 | pcre_copy_substring(CS av_buffer, ovector, i, 1, CS malware_name_buffer, 255); | |
831 | malware_name = malware_name_buffer; | |
832 | }; | |
833 | }; | |
834 | } | |
835 | while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL); | |
f1e894f3 | 836 | (void)close(sock); |
8523533c TK |
837 | } |
838 | /* ----------------------------------------------------------------------- */ | |
839 | ||
840 | /* "kavdaemon" scanner type ------------------------------------------------ */ | |
841 | else if (strcmpic(scanner_name,US"kavdaemon") == 0) { | |
842 | uschar *kav_options; | |
843 | uschar kav_options_buffer[1024]; | |
844 | uschar kav_options_default[] = "/var/run/AvpCtl"; | |
845 | struct sockaddr_un server; | |
846 | int sock; | |
847 | time_t t; | |
848 | uschar tmpbuf[1024]; | |
849 | uschar scanrequest[1024]; | |
850 | uschar kav_match_string[128]; | |
851 | int kav_rc; | |
852 | unsigned long kav_reportlen, bread; | |
853 | pcre *kav_re; | |
8544e77a PP |
854 | uschar *p; |
855 | int fits; | |
8e669ac1 | 856 | |
8523533c TK |
857 | if ((kav_options = string_nextinlist(&av_scanner_work, &sep, |
858 | kav_options_buffer, | |
859 | sizeof(kav_options_buffer))) == NULL) { | |
860 | /* no options supplied, use default options */ | |
861 | kav_options = kav_options_default; | |
862 | }; | |
8e669ac1 | 863 | |
8523533c TK |
864 | /* open the kavdaemon socket */ |
865 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
866 | if (sock < 0) { | |
867 | log_write(0, LOG_MAIN|LOG_PANIC, | |
868 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 869 | return DEFER; |
8523533c TK |
870 | } |
871 | server.sun_family = AF_UNIX; | |
872 | Ustrcpy(server.sun_path, kav_options); | |
873 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 874 | (void)close(sock); |
8523533c TK |
875 | log_write(0, LOG_MAIN|LOG_PANIC, |
876 | "malware acl condition: unable to connect to kavdaemon UNIX socket (%s). errno=%d", kav_options, errno); | |
877 | return DEFER; | |
878 | } | |
8e669ac1 | 879 | |
8523533c TK |
880 | /* get current date and time, build scan request */ |
881 | time(&t); | |
8544e77a PP |
882 | /* pdp note: before the eml_filename parameter, this scanned the |
883 | directory; not finding documentation, so we'll strip off the directory. | |
884 | The side-effect is that the test framework scanning may end up in | |
885 | scanning more than was requested, but for the normal interface, this is | |
886 | fine. */ | |
887 | strftime(CS tmpbuf, sizeof(tmpbuf), "<0>%d %b %H:%M:%S:%%s", localtime(&t)); | |
888 | fits = string_format(scanrequest, 1024,CS tmpbuf, eml_filename); | |
889 | if (!fits) { | |
890 | (void)close(sock); | |
891 | log_write(0, LOG_MAIN|LOG_PANIC, | |
892 | "malware filename does not fit in buffer [malware_internal() kavdaemon]"); | |
893 | } | |
73a46702 | 894 | p = Ustrrchr(scanrequest, '/'); |
8544e77a PP |
895 | if (p) |
896 | *p = '\0'; | |
897 | ||
898 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
899 | scanner_name, kav_options); | |
8e669ac1 | 900 | |
8523533c TK |
901 | /* send scan request */ |
902 | if (send(sock, scanrequest, Ustrlen(scanrequest)+1, 0) < 0) { | |
f1e894f3 | 903 | (void)close(sock); |
8523533c TK |
904 | log_write(0, LOG_MAIN|LOG_PANIC, |
905 | "malware acl condition: unable to write to kavdaemon UNIX socket (%s)", kav_options); | |
906 | return DEFER; | |
907 | } | |
8e669ac1 | 908 | |
8523533c TK |
909 | /* wait for result */ |
910 | if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) { | |
f1e894f3 | 911 | (void)close(sock); |
8523533c TK |
912 | log_write(0, LOG_MAIN|LOG_PANIC, |
913 | "malware acl condition: unable to read 2 bytes from kavdaemon socket."); | |
914 | return DEFER; | |
915 | } | |
8e669ac1 | 916 | |
8523533c TK |
917 | /* get errorcode from one nibble */ |
918 | if (test_byte_order() == LITTLE_MY_ENDIAN) { | |
919 | kav_rc = tmpbuf[0] & 0x0F; | |
920 | } | |
921 | else { | |
922 | kav_rc = tmpbuf[1] & 0x0F; | |
923 | }; | |
8e669ac1 | 924 | |
8523533c TK |
925 | /* improper kavdaemon configuration */ |
926 | if ( (kav_rc == 5) || (kav_rc == 6) ) { | |
f1e894f3 | 927 | (void)close(sock); |
8523533c TK |
928 | log_write(0, LOG_MAIN|LOG_PANIC, |
929 | "malware acl condition: please reconfigure kavdaemon to NOT disinfect or remove infected files."); | |
930 | return DEFER; | |
931 | }; | |
8e669ac1 | 932 | |
8523533c | 933 | if (kav_rc == 1) { |
f1e894f3 | 934 | (void)close(sock); |
8523533c TK |
935 | log_write(0, LOG_MAIN|LOG_PANIC, |
936 | "malware acl condition: kavdaemon reported 'scanning not completed' (code 1)."); | |
937 | return DEFER; | |
938 | }; | |
8e669ac1 | 939 | |
8523533c | 940 | if (kav_rc == 7) { |
f1e894f3 | 941 | (void)close(sock); |
8523533c TK |
942 | log_write(0, LOG_MAIN|LOG_PANIC, |
943 | "malware acl condition: kavdaemon reported 'kavdaemon damaged' (code 7)."); | |
944 | return DEFER; | |
945 | }; | |
8e669ac1 | 946 | |
8523533c TK |
947 | /* code 8 is not handled, since it is ambigous. It appears mostly on |
948 | bounces where part of a file has been cut off */ | |
8e669ac1 | 949 | |
8523533c TK |
950 | /* "virus found" return codes (2-4) */ |
951 | if ((kav_rc > 1) && (kav_rc < 5)) { | |
952 | int report_flag = 0; | |
8e669ac1 | 953 | |
8523533c TK |
954 | /* setup default virus name */ |
955 | Ustrcpy(malware_name_buffer,"unknown"); | |
956 | malware_name = malware_name_buffer; | |
8e669ac1 | 957 | |
8523533c TK |
958 | if (test_byte_order() == LITTLE_MY_ENDIAN) { |
959 | report_flag = tmpbuf[1]; | |
960 | } | |
961 | else { | |
962 | report_flag = tmpbuf[0]; | |
963 | }; | |
8e669ac1 | 964 | |
8523533c TK |
965 | /* read the report, if available */ |
966 | if( report_flag == 1 ) { | |
967 | /* read report size */ | |
968 | if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) { | |
f1e894f3 | 969 | (void)close(sock); |
8523533c TK |
970 | log_write(0, LOG_MAIN|LOG_PANIC, |
971 | "malware acl condition: cannot read report size from kavdaemon"); | |
972 | return DEFER; | |
973 | }; | |
8e669ac1 | 974 | |
8523533c TK |
975 | /* it's possible that avp returns av_buffer[1] == 1 but the |
976 | reportsize is 0 (!?) */ | |
977 | if (kav_reportlen > 0) { | |
978 | /* set up match regex, depends on retcode */ | |
979 | if( kav_rc == 3 ) | |
980 | Ustrcpy(kav_match_string, "suspicion:\\s*(.+?)\\s*$"); | |
981 | else | |
982 | Ustrcpy(kav_match_string, "infected:\\s*(.+?)\\s*$"); | |
8e669ac1 | 983 | |
8523533c TK |
984 | kav_re = pcre_compile( CS kav_match_string, |
985 | PCRE_COPT, | |
986 | (const char **)&rerror, | |
987 | &roffset, | |
988 | NULL ); | |
8e669ac1 PH |
989 | |
990 | /* read report, linewise */ | |
8523533c TK |
991 | while (kav_reportlen > 0) { |
992 | int result = 0; | |
993 | int ovector[30]; | |
8e669ac1 | 994 | |
8523533c TK |
995 | bread = 0; |
996 | while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) { | |
997 | kav_reportlen--; | |
998 | if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break; | |
999 | bread++; | |
1000 | }; | |
1001 | bread++; | |
1002 | tmpbuf[bread] = '\0'; | |
8e669ac1 | 1003 | |
8523533c TK |
1004 | /* try matcher on the line, grab substring */ |
1005 | result = pcre_exec(kav_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30); | |
1006 | if (result >= 2) { | |
1007 | pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS malware_name_buffer, 255); | |
1008 | break; | |
1009 | }; | |
1010 | }; | |
1011 | }; | |
1012 | }; | |
1013 | } | |
1014 | else { | |
1015 | /* no virus found */ | |
1016 | malware_name = NULL; | |
1017 | }; | |
8e669ac1 | 1018 | |
f1e894f3 | 1019 | (void)close(sock); |
8523533c TK |
1020 | } |
1021 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1022 | |
1023 | ||
8523533c TK |
1024 | /* "cmdline" scanner type ------------------------------------------------ */ |
1025 | else if (strcmpic(scanner_name,US"cmdline") == 0) { | |
1026 | uschar *cmdline_scanner; | |
1027 | uschar cmdline_scanner_buffer[1024]; | |
1028 | uschar *cmdline_trigger; | |
1029 | uschar cmdline_trigger_buffer[1024]; | |
1030 | const pcre *cmdline_trigger_re; | |
1031 | uschar *cmdline_regex; | |
1032 | uschar cmdline_regex_buffer[1024]; | |
1033 | const pcre *cmdline_regex_re; | |
1034 | uschar file_name[1024]; | |
1035 | uschar commandline[1024]; | |
1036 | void (*eximsigchld)(int); | |
1037 | void (*eximsigpipe)(int); | |
1038 | FILE *scanner_out = NULL; | |
1039 | FILE *scanner_record = NULL; | |
1040 | uschar linebuffer[32767]; | |
1041 | int trigger = 0; | |
1042 | int result; | |
1043 | int ovector[30]; | |
8544e77a PP |
1044 | uschar *p; |
1045 | BOOL fits; | |
8e669ac1 | 1046 | |
8523533c TK |
1047 | /* find scanner command line */ |
1048 | if ((cmdline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
1049 | cmdline_scanner_buffer, | |
1050 | sizeof(cmdline_scanner_buffer))) == NULL) { | |
1051 | /* no command line supplied */ | |
1052 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1053 | "malware acl condition: missing commandline specification for cmdline scanner type."); | |
8e669ac1 | 1054 | return DEFER; |
8523533c | 1055 | }; |
8e669ac1 | 1056 | |
8523533c TK |
1057 | /* find scanner output trigger */ |
1058 | if ((cmdline_trigger = string_nextinlist(&av_scanner_work, &sep, | |
1059 | cmdline_trigger_buffer, | |
1060 | sizeof(cmdline_trigger_buffer))) == NULL) { | |
1061 | /* no trigger regex supplied */ | |
1062 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1063 | "malware acl condition: missing trigger specification for cmdline scanner type."); | |
8e669ac1 | 1064 | return DEFER; |
8523533c | 1065 | }; |
8e669ac1 | 1066 | |
8523533c TK |
1067 | /* precompile trigger regex */ |
1068 | cmdline_trigger_re = pcre_compile(CS cmdline_trigger, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
1069 | if (cmdline_trigger_re == NULL) { | |
1070 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1071 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_trigger_re, rerror, roffset); | |
1072 | return DEFER; | |
1073 | }; | |
8e669ac1 | 1074 | |
8523533c TK |
1075 | /* find scanner name regex */ |
1076 | if ((cmdline_regex = string_nextinlist(&av_scanner_work, &sep, | |
1077 | cmdline_regex_buffer, | |
1078 | sizeof(cmdline_regex_buffer))) == NULL) { | |
1079 | /* no name regex supplied */ | |
1080 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1081 | "malware acl condition: missing virus name regex specification for cmdline scanner type."); | |
8e669ac1 | 1082 | return DEFER; |
8523533c | 1083 | }; |
8e669ac1 | 1084 | |
8523533c TK |
1085 | /* precompile name regex */ |
1086 | cmdline_regex_re = pcre_compile(CS cmdline_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
1087 | if (cmdline_regex_re == NULL) { | |
1088 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1089 | "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_regex_re, rerror, roffset); | |
1090 | return DEFER; | |
1091 | }; | |
8e669ac1 | 1092 | |
8544e77a PP |
1093 | /* prepare scanner call; despite the naming, file_name holds a directory |
1094 | name which is documented as the value given to %s. */ | |
1095 | if (Ustrlen(eml_filename) > sizeof(file_name) - 1) | |
1096 | { | |
1097 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1098 | "malware filename does not fit in buffer [malware_internal() cmdline]"); | |
1099 | return DEFER; | |
1100 | } | |
3346ab01 PP |
1101 | Ustrcpy(file_name, eml_filename); |
1102 | p = Ustrrchr(file_name, '/'); | |
8544e77a PP |
1103 | if (p) |
1104 | *p = '\0'; | |
1105 | fits = string_format(commandline, sizeof(commandline), CS cmdline_scanner, file_name); | |
1106 | if (!fits) | |
1107 | { | |
1108 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1109 | "cmdline scanner command-line does not fit in buffer"); | |
1110 | return DEFER; | |
1111 | } | |
1112 | ||
8523533c | 1113 | /* redirect STDERR too */ |
8544e77a PP |
1114 | if (Ustrlen(commandline) + 5 > sizeof(commandline)) |
1115 | { | |
1116 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1117 | "cmdline scanner command-line does not fit in buffer (STDERR redirect)"); | |
1118 | return DEFER; | |
1119 | } | |
8523533c | 1120 | Ustrcat(commandline," 2>&1"); |
8e669ac1 | 1121 | |
8544e77a PP |
1122 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline); |
1123 | ||
8523533c TK |
1124 | /* store exims signal handlers */ |
1125 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1126 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
8e669ac1 | 1127 | |
8523533c TK |
1128 | scanner_out = popen(CS commandline,"r"); |
1129 | if (scanner_out == NULL) { | |
1130 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1131 | "malware acl condition: calling cmdline scanner (%s) failed: %s.", commandline, strerror(errno)); | |
1132 | signal(SIGCHLD,eximsigchld); | |
1133 | signal(SIGPIPE,eximsigpipe); | |
1134 | return DEFER; | |
1135 | }; | |
8e669ac1 | 1136 | |
b07e6aa3 | 1137 | (void)string_format(file_name,1024,"%s/scan/%s/%s_scanner_output", spool_directory, message_id, message_id); |
2632889e | 1138 | scanner_record = modefopen(file_name,"wb",SPOOL_MODE); |
8e669ac1 | 1139 | |
8523533c TK |
1140 | if (scanner_record == NULL) { |
1141 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1142 | "malware acl condition: opening scanner output file (%s) failed: %s.", file_name, strerror(errno)); | |
1143 | pclose(scanner_out); | |
1144 | signal(SIGCHLD,eximsigchld); | |
1145 | signal(SIGPIPE,eximsigpipe); | |
1146 | return DEFER; | |
1147 | }; | |
8e669ac1 | 1148 | |
8523533c TK |
1149 | /* look for trigger while recording output */ |
1150 | while(fgets(CS linebuffer,32767,scanner_out) != NULL) { | |
1151 | if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) { | |
1152 | /* short write */ | |
1153 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1154 | "malware acl condition: short write on scanner output file (%s).", file_name); | |
1155 | pclose(scanner_out); | |
1156 | signal(SIGCHLD,eximsigchld); | |
1157 | signal(SIGPIPE,eximsigpipe); | |
1158 | return DEFER; | |
1159 | }; | |
1160 | /* try trigger match */ | |
1161 | if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1)) | |
1162 | trigger = 1; | |
1163 | }; | |
8e669ac1 | 1164 | |
f1e894f3 | 1165 | (void)fclose(scanner_record); |
8523533c TK |
1166 | pclose(scanner_out); |
1167 | signal(SIGCHLD,eximsigchld); | |
1168 | signal(SIGPIPE,eximsigpipe); | |
8e669ac1 | 1169 | |
8523533c TK |
1170 | if (trigger) { |
1171 | /* setup default virus name */ | |
1172 | Ustrcpy(malware_name_buffer,"unknown"); | |
1173 | malware_name = malware_name_buffer; | |
8e669ac1 | 1174 | |
8523533c | 1175 | /* re-open the scanner output file, look for name match */ |
c58b88df | 1176 | scanner_record = fopen(CS file_name,"rb"); |
8523533c TK |
1177 | while(fgets(CS linebuffer,32767,scanner_record) != NULL) { |
1178 | /* try match */ | |
1179 | result = pcre_exec(cmdline_regex_re, NULL, CS linebuffer, Ustrlen(linebuffer), 0, 0, ovector, 30); | |
1180 | if (result >= 2) { | |
1181 | pcre_copy_substring(CS linebuffer, ovector, result, 1, CS malware_name_buffer, 255); | |
1182 | }; | |
1183 | }; | |
f1e894f3 | 1184 | (void)fclose(scanner_record); |
8523533c TK |
1185 | } |
1186 | else { | |
1187 | /* no virus found */ | |
1188 | malware_name = NULL; | |
1189 | }; | |
1190 | } | |
1191 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 PH |
1192 | |
1193 | ||
8523533c TK |
1194 | /* "sophie" scanner type ------------------------------------------------- */ |
1195 | else if (strcmpic(scanner_name,US"sophie") == 0) { | |
1196 | uschar *sophie_options; | |
1197 | uschar sophie_options_buffer[1024]; | |
1198 | uschar sophie_options_default[] = "/var/run/sophie"; | |
1199 | int bread = 0; | |
1200 | struct sockaddr_un server; | |
8544e77a PP |
1201 | int sock, len; |
1202 | uschar *p; | |
8523533c TK |
1203 | uschar file_name[1024]; |
1204 | uschar av_buffer[1024]; | |
8e669ac1 | 1205 | |
8523533c TK |
1206 | if ((sophie_options = string_nextinlist(&av_scanner_work, &sep, |
1207 | sophie_options_buffer, | |
1208 | sizeof(sophie_options_buffer))) == NULL) { | |
1209 | /* no options supplied, use default options */ | |
1210 | sophie_options = sophie_options_default; | |
1211 | }; | |
8e669ac1 | 1212 | |
8523533c TK |
1213 | /* open the sophie socket */ |
1214 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1215 | if (sock < 0) { | |
1216 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1217 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1218 | return DEFER; |
8523533c TK |
1219 | } |
1220 | server.sun_family = AF_UNIX; | |
1221 | Ustrcpy(server.sun_path, sophie_options); | |
1222 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1223 | (void)close(sock); |
8523533c TK |
1224 | log_write(0, LOG_MAIN|LOG_PANIC, |
1225 | "malware acl condition: unable to connect to sophie UNIX socket (%s). errno=%d", sophie_options, errno); | |
1226 | return DEFER; | |
1227 | } | |
8e669ac1 | 1228 | |
8523533c | 1229 | /* pass the scan directory to sophie */ |
8544e77a PP |
1230 | len = Ustrlen(eml_filename) + 1; |
1231 | if (len > sizeof(file_name)) | |
1232 | { | |
1233 | (void)close(sock); | |
1234 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1235 | "malware filename does not fit in buffer [malware_internal() sophie]"); | |
1236 | return DEFER; | |
1237 | } | |
1238 | memcpy(file_name, eml_filename, len); | |
73a46702 | 1239 | p = Ustrrchr(file_name, '/'); |
8544e77a PP |
1240 | if (p) |
1241 | *p = '\0'; | |
1242 | ||
1243 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
1244 | scanner_name, sophie_options); | |
1245 | ||
8523533c | 1246 | if (write(sock, file_name, Ustrlen(file_name)) < 0) { |
f1e894f3 | 1247 | (void)close(sock); |
8523533c TK |
1248 | log_write(0, LOG_MAIN|LOG_PANIC, |
1249 | "malware acl condition: unable to write to sophie UNIX socket (%s)", sophie_options); | |
8e669ac1 | 1250 | return DEFER; |
8523533c | 1251 | }; |
8e669ac1 | 1252 | |
f1e894f3 | 1253 | (void)write(sock, "\n", 1); |
8e669ac1 | 1254 | |
8523533c TK |
1255 | /* wait for result */ |
1256 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1257 | if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) { |
f1e894f3 | 1258 | (void)close(sock); |
8523533c TK |
1259 | log_write(0, LOG_MAIN|LOG_PANIC, |
1260 | "malware acl condition: unable to read from sophie UNIX socket (%s)", sophie_options); | |
1261 | return DEFER; | |
1262 | }; | |
8e669ac1 | 1263 | |
f1e894f3 | 1264 | (void)close(sock); |
8e669ac1 | 1265 | |
8523533c TK |
1266 | /* infected ? */ |
1267 | if (av_buffer[0] == '1') { | |
1268 | if (Ustrchr(av_buffer, '\n')) *Ustrchr(av_buffer, '\n') = '\0'; | |
1269 | Ustrcpy(malware_name_buffer,&av_buffer[2]); | |
1270 | malware_name = malware_name_buffer; | |
1271 | } | |
1272 | else if (!strncmp(CS av_buffer, "-1", 2)) { | |
1273 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1274 | "malware acl condition: malware acl condition: sophie reported error"); | |
1275 | return DEFER; | |
1276 | } | |
1277 | else { | |
1278 | /* all ok, no virus */ | |
1279 | malware_name = NULL; | |
1280 | }; | |
1281 | } | |
1282 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1283 | |
8523533c TK |
1284 | |
1285 | /* "clamd" scanner type ------------------------------------------------- */ | |
8544e77a PP |
1286 | /* This code was originally contributed by David Saez */ |
1287 | /* There are three scanning methods available to us: | |
1288 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1289 | * (2) Use the STREAM command, send the data on a separate port | |
1290 | * (3) Use the zINSTREAM command, send the data inline | |
1291 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1292 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1293 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
1294 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless | |
1295 | * WITH_OLD_CLAMAV_STREAM is defined. | |
1296 | * See Exim bug 926 for details. */ | |
8523533c TK |
1297 | else if (strcmpic(scanner_name,US"clamd") == 0) { |
1298 | uschar *clamd_options; | |
1299 | uschar clamd_options_buffer[1024]; | |
1300 | uschar clamd_options_default[] = "/tmp/clamd"; | |
94a18f28 | 1301 | uschar *p, *vname, *result_tag, *response_end; |
8523533c | 1302 | struct sockaddr_un server; |
f7b63901 | 1303 | int sock,bread=0; |
8e669ac1 | 1304 | unsigned int port; |
8523533c TK |
1305 | uschar file_name[1024]; |
1306 | uschar av_buffer[1024]; | |
1307 | uschar hostname[256]; | |
1308 | struct hostent *he; | |
1309 | struct in_addr in; | |
2376f2f5 TK |
1310 | uschar *clamd_options2; |
1311 | uschar clamd_options2_buffer[1024]; | |
1312 | uschar clamd_options2_default[] = ""; | |
2376f2f5 | 1313 | uschar *clamav_fbuf; |
73a46702 | 1314 | int clam_fd, result; |
2376f2f5 | 1315 | unsigned int fsize; |
8544e77a PP |
1316 | BOOL use_scan_command, fits; |
1317 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1318 | uschar av_buffer2[1024]; | |
73a46702 | 1319 | int sockData; |
8544e77a PP |
1320 | #else |
1321 | uint32_t send_size, send_final_zeroblock; | |
1322 | #endif | |
8523533c TK |
1323 | |
1324 | if ((clamd_options = string_nextinlist(&av_scanner_work, &sep, | |
1325 | clamd_options_buffer, | |
1326 | sizeof(clamd_options_buffer))) == NULL) { | |
1327 | /* no options supplied, use default options */ | |
1328 | clamd_options = clamd_options_default; | |
1329 | } | |
2376f2f5 TK |
1330 | if ((clamd_options2 = string_nextinlist(&av_scanner_work, &sep, |
1331 | clamd_options2_buffer, | |
1332 | sizeof(clamd_options2_buffer))) == NULL) { | |
1333 | clamd_options2 = clamd_options2_default; | |
1334 | } | |
8e669ac1 | 1335 | |
8544e77a PP |
1336 | if ((*clamd_options == '/') || (strcmpic(clamd_options2,US"local") == 0)) |
1337 | use_scan_command = TRUE; | |
1338 | else | |
1339 | use_scan_command = FALSE; | |
1340 | ||
94a18f28 PP |
1341 | /* See the discussion of response formats below to see why we really don't |
1342 | like colons in filenames when passing filenames to ClamAV. */ | |
1343 | if (use_scan_command && Ustrchr(eml_filename, ':')) { | |
1344 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1345 | "malware acl condition: clamd: local/SCAN mode incompatible with" \ | |
1346 | " : in path to email filename [%s]", eml_filename); | |
1347 | return DEFER; | |
1348 | } | |
1349 | ||
8523533c TK |
1350 | /* socket does not start with '/' -> network socket */ |
1351 | if (*clamd_options != '/') { | |
8e669ac1 | 1352 | |
8544e77a PP |
1353 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd |
1354 | * only supports AF_INET, but we should probably be looking to the | |
1355 | * future and rewriting this to be protocol-independent anyway. */ | |
1356 | ||
8523533c TK |
1357 | /* extract host and port part */ |
1358 | if( sscanf(CS clamd_options, "%s %u", hostname, &port) != 2 ) { | |
1359 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1360 | "malware acl condition: clamd: invalid socket '%s'", clamd_options); | |
1361 | return DEFER; | |
1362 | }; | |
8e669ac1 | 1363 | |
8523533c TK |
1364 | /* Lookup the host */ |
1365 | if((he = gethostbyname(CS hostname)) == 0) { | |
1366 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1367 | "malware acl condition: clamd: failed to lookup host '%s'", hostname); | |
1368 | return DEFER; | |
1369 | } | |
8e669ac1 | 1370 | |
8523533c | 1371 | in = *(struct in_addr *) he->h_addr_list[0]; |
8e669ac1 | 1372 | |
8523533c TK |
1373 | /* Open the ClamAV Socket */ |
1374 | if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
1375 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1376 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1377 | strerror(errno)); | |
1378 | return DEFER; | |
1379 | } | |
8e669ac1 | 1380 | |
8523533c | 1381 | if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { |
f1e894f3 | 1382 | (void)close(sock); |
8523533c TK |
1383 | log_write(0, LOG_MAIN|LOG_PANIC, |
1384 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1385 | inet_ntoa(in), port, strerror(errno)); | |
1386 | return DEFER; | |
1387 | } | |
2376f2f5 | 1388 | |
8544e77a PP |
1389 | } else { |
1390 | /* open the local socket */ | |
1391 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
1392 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1393 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1394 | strerror(errno)); | |
1395 | return DEFER; | |
1396 | } | |
2376f2f5 | 1397 | |
8544e77a PP |
1398 | server.sun_family = AF_UNIX; |
1399 | Ustrcpy(server.sun_path, clamd_options); | |
8e669ac1 | 1400 | |
8544e77a PP |
1401 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { |
1402 | (void)close(sock); | |
1403 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1404 | "malware acl condition: clamd: unable to connect to UNIX socket %s (%s)", | |
1405 | clamd_options, strerror(errno) ); | |
1406 | return DEFER; | |
1407 | } | |
1408 | } | |
8e669ac1 | 1409 | |
8544e77a PP |
1410 | /* have socket in variable "sock"; command to use is semi-independent of |
1411 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1412 | * domain socket, or explicitly told local) else we stream the data. | |
1413 | * How we stream the data depends upon how we were built. */ | |
2376f2f5 | 1414 | |
8544e77a | 1415 | if (!use_scan_command) { |
2376f2f5 | 1416 | |
8544e77a PP |
1417 | #ifdef WITH_OLD_CLAMAV_STREAM |
1418 | /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to | |
1419 | * that port on a second connection; then in the scan-method-neutral | |
1420 | * part, read the response back on the original connection. */ | |
2376f2f5 | 1421 | |
8544e77a PP |
1422 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n", |
1423 | scanner_name); | |
8e669ac1 | 1424 | |
8544e77a PP |
1425 | /* Pass the string to ClamAV (7 = "STREAM\n") */ |
1426 | if (send(sock, "STREAM\n", 7, 0) < 0) { | |
1427 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", | |
1428 | strerror(errno)); | |
1429 | (void)close(sock); | |
1430 | return DEFER; | |
1431 | } | |
1432 | memset(av_buffer2, 0, sizeof(av_buffer2)); | |
1433 | bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT); | |
8e669ac1 | 1434 | |
8544e77a PP |
1435 | if (bread < 0) { |
1436 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1437 | "malware acl condition: clamd: unable to read PORT from socket (%s)", | |
1438 | strerror(errno)); | |
1439 | (void)close(sock); | |
1440 | return DEFER; | |
1441 | } | |
8e669ac1 | 1442 | |
8544e77a PP |
1443 | if (bread == sizeof(av_buffer)) { |
1444 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1445 | "malware acl condition: clamd: buffer too small"); | |
1446 | (void)close(sock); | |
1447 | return DEFER; | |
1448 | } | |
8e669ac1 | 1449 | |
8544e77a PP |
1450 | if (!(*av_buffer2)) { |
1451 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1452 | "malware acl condition: clamd: ClamAV returned null"); | |
1453 | (void)close(sock); | |
1454 | return DEFER; | |
1455 | } | |
8e669ac1 | 1456 | |
8544e77a PP |
1457 | av_buffer2[bread] = '\0'; |
1458 | if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) { | |
1459 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1460 | "malware acl condition: clamd: Expected port information from clamd, got '%s'", av_buffer2); | |
1461 | (void)close(sock); | |
1462 | return DEFER; | |
1463 | }; | |
2376f2f5 | 1464 | |
8544e77a PP |
1465 | if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) { |
1466 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1467 | "malware acl condition: clamd: unable to acquire socket (%s)", | |
1468 | strerror(errno)); | |
1469 | (void)close(sock); | |
1470 | return DEFER; | |
1471 | } | |
384152a6 | 1472 | |
8544e77a PP |
1473 | if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) { |
1474 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1475 | "malware acl condition: clamd: connection to %s, port %u failed (%s)", | |
1476 | inet_ntoa(in), port, strerror(errno)); | |
1477 | (void)close(sockData); (void)close(sock); | |
1478 | return DEFER; | |
1479 | } | |
384152a6 | 1480 | |
8544e77a PP |
1481 | #define CLOSE_SOCKDATA (void)close(sockData) |
1482 | #else /* WITH_OLD_CLAMAV_STREAM not defined */ | |
1483 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> | |
1484 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1485 | chunk. */ | |
384152a6 | 1486 | |
8544e77a PP |
1487 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", |
1488 | scanner_name); | |
384152a6 | 1489 | |
8544e77a PP |
1490 | /* Pass the string to ClamAV (10 = "zINSTREAM\0") */ |
1491 | if (send(sock, "zINSTREAM", 10, 0) < 0) { | |
8523533c | 1492 | log_write(0, LOG_MAIN|LOG_PANIC, |
8544e77a PP |
1493 | "malware acl condition: clamd: unable to send zINSTREAM to socket (%s)", |
1494 | strerror(errno)); | |
1495 | (void)close(sock); | |
8523533c TK |
1496 | return DEFER; |
1497 | } | |
8e669ac1 | 1498 | |
8544e77a PP |
1499 | #define CLOSE_SOCKDATA /**/ |
1500 | #endif | |
8e669ac1 | 1501 | |
8544e77a PP |
1502 | /* calc file size */ |
1503 | clam_fd = open(CS eml_filename, O_RDONLY); | |
1504 | if (clam_fd == -1) { | |
8523533c | 1505 | log_write(0, LOG_MAIN|LOG_PANIC, |
8544e77a PP |
1506 | "malware acl condition: clamd: can't open spool file %s: %s", |
1507 | eml_filename, strerror(errno)); | |
1508 | CLOSE_SOCKDATA; (void)close(sock); | |
8523533c TK |
1509 | return DEFER; |
1510 | } | |
8544e77a PP |
1511 | fsize = lseek(clam_fd, 0, SEEK_END); |
1512 | if (fsize == -1) { | |
1513 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1514 | "malware acl condition: clamd: can't seek spool file %s: %s", | |
1515 | eml_filename, strerror(errno)); | |
1516 | CLOSE_SOCKDATA; (void)close(sock); | |
1517 | return DEFER; | |
1518 | } | |
1519 | lseek(clam_fd, 0, SEEK_SET); | |
8e669ac1 | 1520 | |
8544e77a PP |
1521 | clamav_fbuf = (uschar *) malloc (fsize); |
1522 | if (!clamav_fbuf) { | |
1523 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1524 | "malware acl condition: clamd: unable to allocate memory %u for file (%s)", | |
1525 | fsize, eml_filename); | |
1526 | CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd); | |
1527 | return DEFER; | |
1528 | } | |
8e669ac1 | 1529 | |
8544e77a PP |
1530 | result = read (clam_fd, clamav_fbuf, fsize); |
1531 | if (result == -1) { | |
1532 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1533 | "malware acl condition: clamd: can't read spool file %s: %s", | |
1534 | eml_filename, strerror(errno)); | |
1535 | CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd); | |
1536 | free(clamav_fbuf); | |
1537 | return DEFER; | |
1538 | } | |
1539 | (void)close(clam_fd); | |
8e669ac1 | 1540 | |
8544e77a PP |
1541 | /* send file body to socket */ |
1542 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1543 | if (send(sockData, clamav_fbuf, fsize, 0) < 0) { | |
1544 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1545 | "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port); | |
1546 | CLOSE_SOCKDATA; (void)close(sock); | |
1547 | free(clamav_fbuf); | |
1548 | return DEFER; | |
1549 | } | |
1550 | #else | |
1551 | send_size = htonl(fsize); | |
1552 | send_final_zeroblock = 0; | |
1553 | if ((send(sock, &send_size, sizeof(send_size), 0) < 0) || | |
1554 | (send(sock, clamav_fbuf, fsize, 0) < 0) || | |
1555 | (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
1556 | { | |
1557 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1558 | "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port); | |
1559 | (void)close(sock); | |
1560 | free(clamav_fbuf); | |
1561 | return DEFER; | |
1562 | } | |
1563 | #endif | |
8e669ac1 | 1564 | |
8544e77a PP |
1565 | free(clamav_fbuf); |
1566 | ||
1567 | CLOSE_SOCKDATA; | |
1568 | #undef CLOSE_SOCKDATA | |
1569 | ||
1570 | } else { /* use scan command */ | |
1571 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1572 | * scan-method-neutral part, read the response back */ | |
1573 | ||
1574 | /* ================================================================= */ | |
1575 | ||
1576 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1577 | which dates to when ClamAV needed us to break apart the email into the | |
1578 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1579 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1580 | doing this would actually have resulted in the mail attachments being | |
1581 | scanned twice, in the broken out files and from the original .eml. | |
1582 | Since ClamAV now handles emails (and has for quite some time) we can | |
1583 | just use the email file itself. */ | |
1584 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ | |
1585 | fits = string_format(file_name, sizeof(file_name), "SCAN %s\n", | |
1586 | eml_filename); | |
1587 | if (!fits) { | |
1588 | (void)close(sock); | |
1589 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1590 | "malware filename does not fit in buffer [malware_internal() clamd]"); | |
1591 | } | |
8e669ac1 | 1592 | |
8544e77a PP |
1593 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n", |
1594 | scanner_name, clamd_options); | |
8e669ac1 | 1595 | |
8544e77a PP |
1596 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) { |
1597 | (void)close(sock); | |
1598 | log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)", | |
1599 | strerror(errno)); | |
1600 | return DEFER; | |
1601 | } | |
8e669ac1 | 1602 | |
8544e77a PP |
1603 | /* Do not shut down the socket for writing; a user report noted that |
1604 | * clamd 0.70 does not react well to this. */ | |
1605 | } | |
1606 | /* Commands have been sent, no matter which scan method or connection | |
1607 | * type we're using; now just read the result, independent of method. */ | |
8e669ac1 | 1608 | |
8523533c TK |
1609 | /* Read the result */ |
1610 | memset(av_buffer, 0, sizeof(av_buffer)); | |
a9ccd69a | 1611 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); |
f1e894f3 | 1612 | (void)close(sock); |
8523533c TK |
1613 | |
1614 | if (!(bread > 0)) { | |
1615 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1616 | "malware acl condition: clamd: unable to read from socket (%s)", | |
1617 | strerror(errno)); | |
1618 | return DEFER; | |
1619 | } | |
8e669ac1 | 1620 | |
8523533c TK |
1621 | if (bread == sizeof(av_buffer)) { |
1622 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1623 | "malware acl condition: clamd: buffer too small"); | |
1624 | return DEFER; | |
1625 | } | |
8e669ac1 | 1626 | |
94a18f28 PP |
1627 | /* Check the result. ClamAV returns one of two result formats. |
1628 | In the basic mode, the response is of the form: | |
1629 | infected: -> "<filename>: <virusname> FOUND" | |
1630 | not-infected: -> "<filename>: OK" | |
1631 | error: -> "<filename>: <errcode> ERROR | |
1632 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1633 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1634 | for the infected case. Compare: | |
1635 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1636 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1637 | ||
1638 | In the streaming case, clamd uses the filename "stream" which you should | |
1639 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1640 | client app will replace "stream" with the original filename before returning | |
1641 | results to stdout, but the trace shows the data). | |
1642 | ||
1643 | We will assume that the pathname passed to clamd from Exim does not contain | |
1644 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1645 | passing a filename to clamd). */ | |
8e669ac1 | 1646 | |
8523533c TK |
1647 | if (!(*av_buffer)) { |
1648 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1649 | "malware acl condition: clamd: ClamAV returned null"); | |
1650 | return DEFER; | |
1651 | } | |
8e669ac1 | 1652 | |
94a18f28 PP |
1653 | /* strip newline at the end (won't be present for zINSTREAM) |
1654 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1655 | this below, so double-check) */ | |
3c5cd616 | 1656 | p = av_buffer + Ustrlen(av_buffer) - 1; |
94a18f28 | 1657 | if (*p == '\n') *p = '\0'; |
3c5cd616 | 1658 | |
8544e77a PP |
1659 | DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer); |
1660 | ||
94a18f28 PP |
1661 | while (isspace(*--p) && (p > av_buffer)) |
1662 | *p = '\0'; | |
1663 | if (*p) ++p; | |
1664 | response_end = p; | |
1665 | ||
8523533c | 1666 | /* colon in returned output? */ |
94a18f28 | 1667 | if((p = Ustrchr(av_buffer,':')) == NULL) { |
8523533c | 1668 | log_write(0, LOG_MAIN|LOG_PANIC, |
94a18f28 | 1669 | "malware acl condition: clamd: ClamAV returned malformed result (missing colon): %s", |
8e669ac1 | 1670 | av_buffer); |
8523533c TK |
1671 | return DEFER; |
1672 | } | |
8e669ac1 | 1673 | |
3c5cd616 | 1674 | /* strip filename */ |
94a18f28 | 1675 | while (*p && isspace(*++p)) /**/; |
8523533c | 1676 | vname = p; |
94a18f28 PP |
1677 | |
1678 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1679 | but we should at least be resistant to it. */ | |
1680 | p = Ustrrchr(vname, ' '); | |
1681 | if (p) | |
1682 | result_tag = p + 1; | |
1683 | else | |
1684 | result_tag = vname; | |
1685 | ||
1686 | if (Ustrcmp(result_tag, "FOUND") == 0) { | |
1687 | /* p should still be the whitespace before the result_tag */ | |
1688 | while (isspace(*p)) --p; | |
1689 | *++p = '\0'; | |
1690 | /* Strip off the extended information too, which will be in parens | |
1691 | after the virus name, with no intervening whitespace. */ | |
1692 | if (*--p == ')') { | |
1693 | /* "(hash:size)", so previous '(' will do; if not found, we have | |
1694 | a curious virus name, but not an error. */ | |
1695 | p = Ustrrchr(vname, '('); | |
1696 | if (p) | |
1697 | *p = '\0'; | |
1698 | } | |
1699 | Ustrncpy(malware_name_buffer, vname, sizeof(malware_name_buffer)-1); | |
1700 | malware_name = malware_name_buffer; | |
1701 | DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name); | |
1702 | ||
1703 | } else if (Ustrcmp(result_tag, "ERROR") == 0) { | |
1704 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1705 | "malware acl condition: clamd: ClamAV returned: %s", | |
1706 | av_buffer); | |
1707 | return DEFER; | |
1708 | ||
1709 | } else if (Ustrcmp(result_tag, "OK") == 0) { | |
1710 | /* Everything should be OK */ | |
1711 | malware_name = NULL; | |
1712 | DEBUG(D_acl) debug_printf("Malware not found\n"); | |
1713 | ||
1714 | } else { | |
1715 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1716 | "malware acl condition: clamd: unparseable response from ClamAV: {%s}", | |
1717 | av_buffer); | |
1718 | return DEFER; | |
8523533c | 1719 | } |
94a18f28 PP |
1720 | |
1721 | } /* clamd */ | |
1722 | ||
8523533c | 1723 | /* ----------------------------------------------------------------------- */ |
8e669ac1 PH |
1724 | |
1725 | ||
8523533c TK |
1726 | /* "mksd" scanner type --------------------------------------------------- */ |
1727 | else if (strcmpic(scanner_name,US"mksd") == 0) { | |
1728 | uschar *mksd_options; | |
1729 | char *mksd_options_end; | |
1730 | uschar mksd_options_buffer[32]; | |
1731 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1732 | struct sockaddr_un server; | |
1733 | int sock; | |
1734 | int retval; | |
8e669ac1 | 1735 | |
8523533c TK |
1736 | if ((mksd_options = string_nextinlist(&av_scanner_work, &sep, |
1737 | mksd_options_buffer, | |
1738 | sizeof(mksd_options_buffer))) != NULL) { | |
1739 | mksd_maxproc = (int) strtol(CS mksd_options, &mksd_options_end, 10); | |
384152a6 TK |
1740 | if ((*mksd_options == '\0') || (*mksd_options_end != '\0') || |
1741 | (mksd_maxproc < 1) || (mksd_maxproc > 32)) { | |
8523533c TK |
1742 | log_write(0, LOG_MAIN|LOG_PANIC, |
1743 | "malware acl condition: mksd: invalid option '%s'", mksd_options); | |
1744 | return DEFER; | |
1745 | } | |
1746 | } | |
8e669ac1 | 1747 | |
8523533c TK |
1748 | /* open the mksd socket */ |
1749 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1750 | if (sock < 0) { | |
1751 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1752 | "malware acl condition: can't open UNIX socket."); | |
8e669ac1 | 1753 | return DEFER; |
8523533c TK |
1754 | } |
1755 | server.sun_family = AF_UNIX; | |
1756 | Ustrcpy(server.sun_path, "/var/run/mksd/socket"); | |
1757 | if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
f1e894f3 | 1758 | (void)close(sock); |
8523533c TK |
1759 | log_write(0, LOG_MAIN|LOG_PANIC, |
1760 | "malware acl condition: unable to connect to mksd UNIX socket (/var/run/mksd/socket). errno=%d", errno); | |
1761 | return DEFER; | |
1762 | } | |
8e669ac1 | 1763 | |
8523533c | 1764 | malware_name = NULL; |
8e669ac1 | 1765 | |
8544e77a PP |
1766 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name); |
1767 | ||
1768 | retval = mksd_scan_packed(sock, eml_filename); | |
8e669ac1 | 1769 | |
8523533c TK |
1770 | if (retval != OK) |
1771 | return retval; | |
1772 | } | |
1773 | /* ----------------------------------------------------------------------- */ | |
1774 | ||
1775 | /* "unknown" scanner type ------------------------------------------------- */ | |
1776 | else { | |
1777 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1778 | "malware condition: unknown scanner type '%s'", scanner_name); | |
1779 | return DEFER; | |
1780 | }; | |
1781 | /* ----------------------------------------------------------------------- */ | |
8e669ac1 | 1782 | |
8523533c TK |
1783 | /* set "been here, done that" marker */ |
1784 | malware_ok = 1; | |
1785 | }; | |
1786 | ||
1787 | /* match virus name against pattern (caseless ------->----------v) */ | |
1788 | if ( (malware_name != NULL) && | |
1789 | (regex_match_and_setup(re, malware_name, 0, -1)) ) { | |
8544e77a | 1790 | DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name); |
8523533c TK |
1791 | return OK; |
1792 | } | |
1793 | else { | |
1794 | return FAIL; | |
1795 | }; | |
1796 | } | |
1797 | ||
1798 | ||
1799 | /* simple wrapper for reading lines from sockets */ | |
1800 | int recv_line(int sock, uschar *buffer, int size) { | |
1801 | uschar *p = buffer; | |
1802 | ||
1803 | memset(buffer,0,size); | |
1804 | /* read until \n */ | |
1805 | while(recv(sock,p,1,0) > -1) { | |
1806 | if ((p-buffer) > (size-2)) break; | |
1807 | if (*p == '\n') break; | |
1808 | if (*p != '\r') p++; | |
1809 | }; | |
1810 | *p = '\0'; | |
1811 | ||
1812 | return (p-buffer); | |
1813 | } | |
1814 | ||
1815 | ||
1816 | /* ============= private routines for the "mksd" scanner type ============== */ | |
1817 | ||
1818 | #include <sys/uio.h> | |
1819 | ||
8544e77a | 1820 | static int mksd_writev (int sock, struct iovec *iov, int iovcnt) |
8523533c TK |
1821 | { |
1822 | int i; | |
8e669ac1 | 1823 | |
8523533c TK |
1824 | for (;;) { |
1825 | do | |
1826 | i = writev (sock, iov, iovcnt); | |
1827 | while ((i < 0) && (errno == EINTR)); | |
1828 | if (i <= 0) { | |
1829 | close (sock); | |
1830 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1831 | "malware acl condition: unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
1832 | return -1; | |
1833 | } | |
8e669ac1 | 1834 | |
8523533c TK |
1835 | for (;;) |
1836 | if (i >= iov->iov_len) { | |
1837 | if (--iovcnt == 0) | |
1838 | return 0; | |
1839 | i -= iov->iov_len; | |
1840 | iov++; | |
1841 | } else { | |
1842 | iov->iov_len -= i; | |
1843 | iov->iov_base = CS iov->iov_base + i; | |
1844 | break; | |
1845 | } | |
1846 | } | |
1847 | } | |
1848 | ||
8544e77a | 1849 | static int mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size) |
8523533c TK |
1850 | { |
1851 | int offset = 0; | |
1852 | int i; | |
8e669ac1 | 1853 | |
8523533c TK |
1854 | do { |
1855 | if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) { | |
1856 | close (sock); | |
1857 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1858 | "malware acl condition: unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
1859 | return -1; | |
1860 | } | |
8e669ac1 | 1861 | |
8523533c TK |
1862 | offset += i; |
1863 | /* offset == av_buffer_size -> buffer full */ | |
1864 | if (offset == av_buffer_size) { | |
1865 | close (sock); | |
1866 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1867 | "malware acl condition: malformed reply received from mksd"); | |
1868 | return -1; | |
1869 | } | |
1870 | } while (av_buffer[offset-1] != '\n'); | |
8e669ac1 | 1871 | |
8523533c TK |
1872 | av_buffer[offset] = '\0'; |
1873 | return offset; | |
1874 | } | |
1875 | ||
8544e77a | 1876 | static int mksd_parse_line (char *line) |
8523533c TK |
1877 | { |
1878 | char *p; | |
8e669ac1 | 1879 | |
8523533c TK |
1880 | switch (*line) { |
1881 | case 'O': | |
1882 | /* OK */ | |
1883 | return OK; | |
1884 | case 'E': | |
1885 | case 'A': | |
1886 | /* ERR */ | |
1887 | if ((p = strchr (line, '\n')) != NULL) | |
1888 | (*p) = '\0'; | |
1889 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1890 | "malware acl condition: mksd scanner failed: %s", line); | |
1891 | return DEFER; | |
1892 | default: | |
1893 | /* VIR */ | |
1894 | if ((p = strchr (line, '\n')) != NULL) { | |
1895 | (*p) = '\0'; | |
1896 | if (((p-line) > 5) && ((p-line) < sizeof (malware_name_buffer)) && (line[3] == ' ')) | |
1897 | if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) { | |
1898 | (*p) = '\0'; | |
1899 | Ustrcpy (malware_name_buffer, line+4); | |
384152a6 | 1900 | malware_name = malware_name_buffer; |
8523533c TK |
1901 | return OK; |
1902 | } | |
1903 | } | |
1904 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1905 | "malware acl condition: malformed reply received from mksd: %s", line); | |
1906 | return DEFER; | |
1907 | } | |
1908 | } | |
1909 | ||
8544e77a | 1910 | static int mksd_scan_packed(int sock, uschar *scan_filename) |
8523533c | 1911 | { |
8544e77a | 1912 | struct iovec iov[3]; |
1ba28e2b | 1913 | const char *cmd = "MSQ\n"; |
8523533c | 1914 | uschar av_buffer[1024]; |
8e669ac1 | 1915 | |
1ba28e2b | 1916 | iov[0].iov_base = (void *) cmd; |
8523533c | 1917 | iov[0].iov_len = 3; |
8544e77a PP |
1918 | iov[1].iov_base = CS scan_filename; |
1919 | iov[1].iov_len = Ustrlen(scan_filename); | |
1ba28e2b | 1920 | iov[2].iov_base = (void *) cmd + 3; |
8544e77a PP |
1921 | iov[2].iov_len = 1; |
1922 | ||
1923 | if (mksd_writev (sock, iov, 3) < 0) | |
8523533c | 1924 | return DEFER; |
8e669ac1 | 1925 | |
8523533c TK |
1926 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0) |
1927 | return DEFER; | |
8e669ac1 | 1928 | |
8523533c | 1929 | close (sock); |
8e669ac1 | 1930 | |
8523533c TK |
1931 | return mksd_parse_line (CS av_buffer); |
1932 | } | |
1933 | ||
1934 | #endif |