Commit | Line | Data |
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8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5a66c31b | 5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-2014 */ |
8523533c TK |
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 | ||
b1f8e4f8 JH |
13 | typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL, |
14 | M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD} scanner_t; | |
15 | typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t; | |
16 | static struct scan | |
17 | { | |
18 | scanner_t scancode; | |
19 | const uschar * name; | |
20 | const uschar * options_default; | |
21 | contype_t conn; | |
22 | } m_scans[] = | |
23 | { | |
24 | { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP }, | |
25 | { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM }, | |
26 | { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX }, | |
27 | { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX }, | |
28 | { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX }, | |
29 | { M_CMDL, US"cmdline", NULL, MC_NONE }, | |
30 | { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX }, | |
31 | { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE }, | |
32 | { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM }, | |
33 | { M_MKSD, US"mksd", NULL, MC_NONE }, | |
34 | { -1, NULL, NULL, MC_NONE } /* end-marker */ | |
35 | }; | |
36 | ||
599dcb77 TL |
37 | /* The maximum number of clamd servers that are supported in the configuration */ |
38 | #define MAX_CLAMD_SERVERS 32 | |
39 | #define MAX_CLAMD_SERVERS_S "32" | |
40 | /* Maximum length of the hostname that can be specified in the clamd address list */ | |
41 | #define MAX_CLAMD_ADDRESS_LENGTH 64 | |
42 | #define MAX_CLAMD_ADDRESS_LENGTH_S "64" | |
43 | ||
44 | typedef struct clamd_address_container { | |
c3680ef0 | 45 | uschar tcp_addr[MAX_CLAMD_ADDRESS_LENGTH+1]; |
599dcb77 TL |
46 | unsigned int tcp_port; |
47 | } clamd_address_container; | |
48 | ||
8523533c | 49 | /* declaration of private routines */ |
b1f8e4f8 | 50 | static int mksd_scan_packed(struct scan * scanent, int sock, uschar *scan_filename); |
8544e77a | 51 | static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking); |
8523533c | 52 | |
b1f8e4f8 JH |
53 | #ifndef nelements |
54 | # define nelements(arr) (sizeof(arr) / sizeof(arr[0])) | |
8523533c TK |
55 | #endif |
56 | ||
a9ccd69a PH |
57 | |
58 | #define MALWARE_TIMEOUT 120 | |
59 | ||
60 | ||
8523533c TK |
61 | #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ |
62 | #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
63 | #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
64 | ||
2376f2f5 TK |
65 | #define DERR_READ_ERR (1<<0) /* read error */ |
66 | #define DERR_NOMEMORY (1<<2) /* no memory */ | |
67 | #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
68 | #define DERR_BAD_CALL (1<<15) /* wrong command */ | |
69 | ||
b1f8e4f8 | 70 | /* Routine to check whether a system is big- or little-endian. |
8523533c TK |
71 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
72 | Needed for proper kavdaemon implementation. Sigh. */ | |
73 | #define BIG_MY_ENDIAN 0 | |
74 | #define LITTLE_MY_ENDIAN 1 | |
b1f8e4f8 JH |
75 | static int test_byte_order(void); |
76 | static inline int | |
77 | test_byte_order() | |
78 | { | |
79 | short int word = 0x0001; | |
80 | char *byte = (char *) &word; | |
81 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); | |
8523533c TK |
82 | } |
83 | ||
b1f8e4f8 | 84 | BOOL malware_ok = FALSE; |
8523533c | 85 | |
8544e77a PP |
86 | /* Gross hacks for the -bmalware option; perhaps we should just create |
87 | the scan directory normally for that case, but look into rigging up the | |
88 | needed header variables if not already set on the command-line? */ | |
89 | extern int spool_mbox_ok; | |
90 | extern uschar spooled_message_id[17]; | |
91 | ||
92 | /************************************************* | |
93 | * Scan an email for malware * | |
94 | *************************************************/ | |
95 | ||
96 | /* This is the normal interface for scanning an email, which doesn't need a | |
97 | filename; it's a wrapper around the malware_file function. | |
98 | ||
99 | Arguments: | |
100 | listptr the list of options to the "malware = ..." ACL condition | |
101 | ||
102 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
103 | where true means malware was found (condition applies) | |
104 | */ | |
b1f8e4f8 JH |
105 | int |
106 | malware(uschar **listptr) | |
107 | { | |
108 | uschar * scan_filename; | |
9e949f00 | 109 | int ret; |
8544e77a | 110 | |
b1f8e4f8 JH |
111 | scan_filename = string_sprintf("%s/scan/%s/%s.eml", |
112 | spool_directory, message_id, message_id); | |
9e949f00 PP |
113 | ret = malware_internal(listptr, scan_filename, FALSE); |
114 | if (ret == DEFER) av_failed = TRUE; | |
115 | ||
116 | return ret; | |
8544e77a PP |
117 | } |
118 | ||
119 | ||
120 | /************************************************* | |
121 | * Scan a file for malware * | |
122 | *************************************************/ | |
123 | ||
124 | /* This is a test wrapper for scanning an email, which is not used in | |
125 | normal processing. Scan any file, using the Exim scanning interface. | |
126 | This function tampers with various global variables so is unsafe to use | |
127 | in any other context. | |
128 | ||
129 | Arguments: | |
130 | eml_filename a file holding the message to be scanned | |
131 | ||
132 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
133 | where true means malware was found (condition applies) | |
134 | */ | |
dbc4b90d | 135 | int |
b1f8e4f8 JH |
136 | malware_in_file(uschar *eml_filename) |
137 | { | |
8544e77a PP |
138 | uschar *scan_options[2]; |
139 | uschar message_id_buf[64]; | |
140 | int ret; | |
141 | ||
73a46702 | 142 | scan_options[0] = US"*"; |
8544e77a PP |
143 | scan_options[1] = NULL; |
144 | ||
145 | /* spool_mbox() assumes various parameters exist, when creating | |
146 | the relevant directory and the email within */ | |
147 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
17c76198 | 148 | "dummy-%d", vaguely_random_number(INT_MAX)); |
8544e77a | 149 | message_id = message_id_buf; |
73a46702 PP |
150 | sender_address = US"malware-sender@example.net"; |
151 | return_path = US""; | |
8544e77a | 152 | recipients_list = NULL; |
73a46702 | 153 | receive_add_recipient(US"malware-victim@example.net", -1); |
8544e77a PP |
154 | enable_dollar_recipients = TRUE; |
155 | ||
156 | ret = malware_internal(scan_options, eml_filename, TRUE); | |
157 | ||
73a46702 | 158 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
8544e77a PP |
159 | spool_mbox_ok = 1; |
160 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
161 | set, but if that changes, then it should apply to these tests too */ | |
162 | unspool_mbox(); | |
163 | ||
08488c86 PP |
164 | /* silence static analysis tools */ |
165 | message_id = NULL; | |
166 | ||
8544e77a PP |
167 | return ret; |
168 | } | |
169 | ||
170 | ||
b1f8e4f8 JH |
171 | static inline int |
172 | malware_errlog_defer(const uschar * str) | |
173 | { | |
174 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str); | |
175 | return DEFER; | |
176 | } | |
177 | ||
178 | static int | |
179 | m_errlog_defer(struct scan * scanent, const uschar * str) | |
180 | { | |
181 | return malware_errlog_defer(string_sprintf("%s: %s", scanent->name, str)); | |
182 | } | |
183 | static int | |
184 | m_errlog_defer_3(struct scan * scanent, const uschar * str, | |
185 | int fd_to_close) | |
186 | { | |
187 | (void) close(fd_to_close); | |
188 | return m_errlog_defer(scanent, str); | |
189 | } | |
190 | ||
191 | /*************************************************/ | |
192 | ||
193 | /* Only used by the Clamav code, which is working from a list of servers and | |
194 | uses the returned in_addr to get a second connection to the same system. | |
195 | */ | |
196 | static inline int | |
197 | m_tcpsocket(const uschar * hostname, unsigned int port, | |
198 | host_item * host, uschar ** errstr) | |
199 | { | |
200 | return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr); | |
201 | } | |
202 | ||
203 | static int | |
204 | m_tcpsocket_fromdef(const uschar * hostport, uschar ** errstr) | |
205 | { | |
206 | int scan; | |
207 | uschar hostname[256]; | |
208 | unsigned int portlow, porthigh; | |
209 | ||
210 | /* extract host and port part */ | |
211 | scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh); | |
212 | if ( scan != 3 ) { | |
213 | if ( scan != 2 ) { | |
214 | *errstr = string_sprintf("invalid socket '%s'", hostport); | |
215 | return -1; | |
216 | } | |
217 | porthigh = portlow; | |
218 | } | |
219 | ||
220 | return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh, | |
221 | 5, NULL, errstr); | |
222 | } | |
223 | ||
224 | static int | |
225 | m_unixsocket(const uschar * path, uschar ** errstr) | |
226 | { | |
227 | int sock; | |
228 | struct sockaddr_un server; | |
229 | ||
230 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
231 | *errstr = US"can't open UNIX socket."; | |
232 | return -1; | |
233 | } | |
234 | ||
235 | server.sun_family = AF_UNIX; | |
236 | Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1); | |
237 | server.sun_path[sizeof(server.sun_path)-1] = '\0'; | |
238 | if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) { | |
239 | int err = errno; | |
240 | (void)close(sock); | |
241 | *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s", | |
242 | path, strerror(err)); | |
243 | return -1; | |
244 | } | |
245 | return sock; | |
246 | } | |
247 | ||
248 | static inline int | |
249 | m_streamsocket(const uschar * spec, uschar ** errstr) | |
250 | { | |
251 | return *spec == '/' | |
252 | ? m_unixsocket(spec, errstr) : m_tcpsocket_fromdef(spec, errstr); | |
253 | } | |
254 | ||
255 | static int | |
256 | m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr) | |
257 | { | |
258 | if (send(sock, buf, cnt, 0) < 0) { | |
259 | int err = errno; | |
260 | (void)close(sock); | |
261 | *errstr = string_sprintf("unable to send to socket (%s): %s", | |
262 | buf, strerror(err)); | |
263 | return -1; | |
264 | } | |
265 | return sock; | |
266 | } | |
267 | ||
268 | static const pcre * | |
269 | m_pcre_compile(const uschar * re, uschar ** errstr) | |
270 | { | |
271 | const uschar * rerror; | |
272 | int roffset; | |
273 | const pcre * cre; | |
274 | ||
275 | cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
276 | if (!cre) | |
277 | *errstr= string_sprintf("regular expression error in '%s': %s at offset %d", | |
278 | re, rerror, roffset); | |
279 | return cre; | |
280 | } | |
281 | ||
282 | uschar * | |
283 | m_pcre_exec(const pcre * cre, uschar * text) | |
284 | { | |
285 | int ovector[10*3]; | |
286 | int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0, | |
287 | ovector, nelements(ovector)); | |
288 | uschar * substr = NULL; | |
289 | if (i >= 2) /* Got it */ | |
290 | pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr); | |
291 | return substr; | |
292 | } | |
293 | ||
294 | static const pcre * | |
295 | m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr) | |
296 | { | |
297 | const uschar * list_ele; | |
298 | const pcre * cre = NULL; | |
299 | ||
300 | if (!(list_ele = string_nextinlist(list, sep, NULL, 0))) | |
301 | *errstr = US listerr; | |
302 | else | |
303 | cre = m_pcre_compile(CUS list_ele, errstr); | |
304 | return cre; | |
305 | } | |
306 | ||
8544e77a PP |
307 | /************************************************* |
308 | * Scan content for malware * | |
309 | *************************************************/ | |
310 | ||
311 | /* This is an internal interface for scanning an email; the normal interface | |
312 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
313 | ||
314 | Arguments: | |
315 | listptr the list of options to the "malware = ..." ACL condition | |
316 | eml_filename the file holding the email to be scanned | |
317 | faking whether or not we're faking this up for the -bmalware test | |
318 | ||
319 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
320 | where true means malware was found (condition applies) | |
321 | */ | |
b1f8e4f8 JH |
322 | static int |
323 | malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking) | |
324 | { | |
8523533c TK |
325 | int sep = 0; |
326 | uschar *list = *listptr; | |
327 | uschar *av_scanner_work = av_scanner; | |
328 | uschar *scanner_name; | |
8523533c | 329 | uschar *malware_regex; |
8523533c | 330 | uschar malware_regex_default[] = ".+"; |
f7b63901 | 331 | unsigned long mbox_size; |
8523533c | 332 | FILE *mbox_file; |
8523533c | 333 | const pcre *re; |
b1f8e4f8 JH |
334 | uschar * errstr; |
335 | struct scan * scanent; | |
336 | const uschar * scanner_options; | |
337 | int sock = -1; | |
8e669ac1 | 338 | |
8523533c | 339 | /* make sure the eml mbox file is spooled up */ |
b1f8e4f8 JH |
340 | if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL))) |
341 | return malware_errlog_defer(US"error while creating mbox spool file"); | |
342 | ||
8523533c TK |
343 | /* none of our current scanners need the mbox |
344 | file as a stream, so we can close it right away */ | |
f1e894f3 | 345 | (void)fclose(mbox_file); |
8e669ac1 | 346 | |
8523533c | 347 | /* extract the malware regex to match against from the option list */ |
b1f8e4f8 JH |
348 | if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0))) |
349 | return FAIL; /* empty means "don't match anything" */ | |
8e669ac1 | 350 | |
b1f8e4f8 | 351 | /* parse 1st option */ |
8e669ac1 | 352 | if ( (strcmpic(malware_regex,US"false") == 0) || |
b1f8e4f8 JH |
353 | (Ustrcmp(malware_regex,"0") == 0) ) |
354 | return FAIL; /* explicitly no matching */ | |
355 | ||
356 | /* special cases (match anything except empty) */ | |
357 | if ( (strcmpic(malware_regex,US"true") == 0) || | |
358 | (Ustrcmp(malware_regex,"*") == 0) || | |
359 | (Ustrcmp(malware_regex,"1") == 0) ) | |
360 | malware_regex = malware_regex_default; | |
8523533c | 361 | |
ee873c8c TK |
362 | /* Reset sep that is set by previous string_nextinlist() call */ |
363 | sep = 0; | |
364 | ||
8523533c | 365 | /* compile the regex, see if it works */ |
b1f8e4f8 JH |
366 | if (!(re = m_pcre_compile(malware_regex, &errstr))) |
367 | return malware_errlog_defer(errstr); | |
8523533c TK |
368 | |
369 | /* if av_scanner starts with a dollar, expand it first */ | |
370 | if (*av_scanner == '$') { | |
b1f8e4f8 JH |
371 | if (!(av_scanner_work = expand_string(av_scanner))) |
372 | return malware_errlog_defer( | |
373 | string_sprintf("av_scanner starts with $, but expansion failed: %s", | |
374 | expand_string_message)); | |
375 | ||
376 | debug_printf("Expanded av_scanner global: %s\n", av_scanner_work); | |
377 | /* disable result caching in this case */ | |
378 | malware_name = NULL; | |
379 | malware_ok = FALSE; | |
8523533c TK |
380 | } |
381 | ||
b1f8e4f8 JH |
382 | /* Do not scan twice (unless av_scanner is dynamic). */ |
383 | if (!malware_ok) { | |
8523533c TK |
384 | |
385 | /* find the scanner type from the av_scanner option */ | |
b1f8e4f8 JH |
386 | if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) |
387 | return malware_errlog_defer(US"av_scanner configuration variable is empty"); | |
388 | ||
389 | for (scanent = m_scans; ; scanent++) { | |
390 | if (!scanent->name) | |
391 | return malware_errlog_defer(string_sprintf("unknown scanner type '%s'", | |
392 | scanner_name)); | |
393 | if (strcmpic(scanner_name, US scanent->name) != 0) | |
394 | continue; | |
395 | if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
396 | scanner_options = scanent->options_default; | |
397 | if (scanent->conn == MC_NONE) | |
398 | break; | |
399 | switch(scanent->conn) | |
384152a6 | 400 | { |
b1f8e4f8 JH |
401 | case MC_TCP: sock = m_tcpsocket_fromdef(scanner_options, &errstr); break; |
402 | case MC_UNIX: sock = m_unixsocket(scanner_options, &errstr); break; | |
403 | case MC_STRM: sock = m_streamsocket(scanner_options, &errstr); break; | |
e3dd1d67 | 404 | default: /* compiler quietening */ break; |
384152a6 | 405 | } |
b1f8e4f8 JH |
406 | if (sock < 0) |
407 | return m_errlog_defer(scanent, errstr); | |
408 | break; | |
384152a6 | 409 | } |
187bc588 | 410 | DEBUG(D_lookup) debug_printf("Malware scan: %s\n", scanner_name); |
8e669ac1 | 411 | |
b1f8e4f8 JH |
412 | switch (scanent->scancode) { |
413 | case M_FPROTD: /* "f-protd" scanner type -------------------------------- */ | |
414 | { | |
415 | uschar *fp_scan_option; | |
416 | unsigned int detected=0, par_count=0; | |
417 | uschar * scanrequest; | |
418 | uschar buf[32768], *strhelper, *strhelper2; | |
419 | uschar * malware_name_internal = NULL; | |
420 | ||
421 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name); | |
422 | scanrequest = string_sprintf("GET %s", eml_filename); | |
423 | ||
424 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, | |
425 | NULL, 0))) { | |
426 | scanrequest = string_sprintf("%s%s%s", scanrequest, | |
427 | par_count ? "%20" : "?", fp_scan_option); | |
428 | par_count++; | |
429 | } | |
430 | scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest); | |
431 | ||
432 | /* send scan request */ | |
433 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
434 | return m_errlog_defer(scanent, errstr); | |
435 | ||
436 | /* We get a lot of empty lines, so we need this hack to check for any data at all */ | |
437 | while( recv(sock, buf, 1, MSG_PEEK) > 0 ) { | |
438 | if ( recv_line(sock, buf, sizeof(buf)) > 0) { | |
439 | if ( Ustrstr(buf, US"<detected type=\"") != NULL ) | |
440 | detected = 1; | |
441 | else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) { | |
442 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) { | |
443 | *strhelper2 = '\0'; | |
444 | malware_name_internal = string_copy(strhelper+6); | |
445 | } | |
446 | } else if ( Ustrstr(buf, US"<summary code=\"") ) | |
447 | malware_name = Ustrstr(buf, US"<summary code=\"11\">") | |
448 | ? malware_name_internal : NULL; | |
449 | } | |
450 | } | |
451 | break; | |
452 | } /* f-protd */ | |
7e274b4b | 453 | |
b1f8e4f8 JH |
454 | case M_DRWEB: /* "drweb" scanner type ----------------------------------- */ |
455 | /* v0.1 - added support for tcp sockets */ | |
456 | /* v0.0 - initial release -- support for unix sockets */ | |
457 | { | |
458 | int result; | |
cb54b2a0 PP |
459 | off_t fsize; |
460 | unsigned int fsize_uint; | |
b1f8e4f8 JH |
461 | uschar * tmpbuf, *drweb_fbuf; |
462 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
463 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
464 | unsigned long bread; | |
465 | const pcre *drweb_re; | |
466 | ||
467 | /* prepare variables */ | |
468 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
469 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
470 | ||
471 | if (*scanner_options != '/') { | |
472 | ||
473 | /* calc file size */ | |
474 | if ((drweb_fd = open(CS eml_filename, O_RDONLY)) == -1) | |
475 | return m_errlog_defer_3(scanent, | |
476 | string_sprintf("can't open spool file %s: %s", | |
477 | eml_filename, strerror(errno)), | |
478 | sock); | |
479 | ||
480 | if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) { | |
481 | int err = errno; | |
482 | (void)close(drweb_fd); | |
483 | return m_errlog_defer_3(scanent, | |
484 | string_sprintf("can't seek spool file %s: %s", | |
485 | eml_filename, strerror(err)), | |
486 | sock); | |
487 | } | |
cb54b2a0 PP |
488 | fsize_uint = (unsigned int) fsize; |
489 | if ((off_t)fsize_uint != fsize) { | |
490 | (void)close(drweb_fd); | |
491 | return m_errlog_defer_3(scanent, | |
492 | string_sprintf("seeking spool file %s, size overflow", | |
493 | eml_filename), | |
494 | sock); | |
495 | } | |
b1f8e4f8 JH |
496 | drweb_slen = htonl(fsize); |
497 | lseek(drweb_fd, 0, SEEK_SET); | |
498 | ||
499 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n", | |
500 | scanner_name, scanner_options); | |
501 | ||
502 | /* send scan request */ | |
503 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
504 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
505 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
506 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) { | |
507 | (void)close(drweb_fd); | |
508 | return m_errlog_defer_3(scanent, | |
509 | string_sprintf("unable to send commands to socket (%s)", scanner_options), | |
510 | sock); | |
511 | } | |
512 | ||
cb54b2a0 | 513 | if (!(drweb_fbuf = (uschar *) malloc (fsize_uint))) { |
b1f8e4f8 JH |
514 | (void)close(drweb_fd); |
515 | return m_errlog_defer_3(scanent, | |
516 | string_sprintf("unable to allocate memory %u for file (%s)", | |
cb54b2a0 | 517 | fsize_uint, eml_filename), |
b1f8e4f8 JH |
518 | sock); |
519 | } | |
520 | ||
521 | if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) { | |
522 | int err = errno; | |
523 | (void)close(drweb_fd); | |
524 | free(drweb_fbuf); | |
525 | return m_errlog_defer_3(scanent, | |
526 | string_sprintf("can't read spool file %s: %s", | |
527 | eml_filename, strerror(err)), | |
528 | sock); | |
529 | } | |
530 | (void)close(drweb_fd); | |
531 | ||
532 | /* send file body to socket */ | |
533 | if (send(sock, drweb_fbuf, fsize, 0) < 0) { | |
534 | free(drweb_fbuf); | |
535 | return m_errlog_defer_3(scanent, | |
536 | string_sprintf("unable to send file body to socket (%s)", scanner_options), | |
537 | sock); | |
538 | } | |
539 | (void)close(drweb_fd); | |
540 | ||
541 | } else { | |
542 | ||
543 | drweb_slen = htonl(Ustrlen(eml_filename)); | |
544 | ||
545 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n", | |
546 | scanner_name, scanner_options); | |
547 | ||
548 | /* send scan request */ | |
549 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
550 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
551 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
552 | (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || | |
553 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) | |
554 | return m_errlog_defer_3(scanent, | |
555 | string_sprintf("unable to send commands to socket (%s)", scanner_options), | |
556 | sock); | |
557 | } | |
8e669ac1 | 558 | |
b1f8e4f8 JH |
559 | /* wait for result */ |
560 | if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) | |
561 | return m_errlog_defer_3(scanent, | |
562 | US"unable to read return code", sock); | |
563 | drweb_rc = ntohl(drweb_rc); | |
564 | ||
565 | if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) | |
566 | return m_errlog_defer_3(scanent, | |
567 | US"unable to read the number of viruses", sock); | |
568 | drweb_vnum = ntohl(drweb_vnum); | |
569 | ||
570 | /* "virus(es) found" if virus number is > 0 */ | |
571 | if (drweb_vnum) { | |
572 | int i; | |
573 | ||
574 | /* setup default virus name */ | |
575 | malware_name = US"unknown"; | |
576 | ||
577 | /* set up match regex */ | |
578 | drweb_re = m_pcre_compile(US"infected\\swith\\s*(.+?)$", &errstr); | |
579 | ||
580 | /* read and concatenate virus names into one string */ | |
581 | for (i=0;i<drweb_vnum;i++) | |
582 | { | |
583 | int size = 0, off = 0, ovector[10*3]; | |
584 | /* read the size of report */ | |
585 | if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) | |
586 | return m_errlog_defer_3(scanent, | |
587 | US"cannot read report size", sock); | |
588 | drweb_slen = ntohl(drweb_slen); | |
589 | tmpbuf = store_get(drweb_slen); | |
590 | ||
591 | /* read report body */ | |
592 | if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) | |
593 | return m_errlog_defer_3(scanent, | |
594 | US"cannot read report string", sock); | |
595 | tmpbuf[drweb_slen] = '\0'; | |
596 | ||
597 | /* try matcher on the line, grab substring */ | |
598 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, | |
599 | ovector, nelements(ovector)); | |
600 | if (result >= 2) { | |
601 | const char * pre_malware_nb; | |
602 | ||
603 | pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb); | |
604 | ||
605 | if (i==0) /* the first name we just copy to malware_name */ | |
606 | malware_name = string_append(NULL, &size, &off, | |
607 | 1, pre_malware_nb); | |
608 | ||
609 | else /* concatenate each new virus name to previous */ | |
610 | malware_name = string_append(malware_name, &size, &off, | |
611 | 2, "/", pre_malware_nb); | |
612 | ||
613 | pcre_free_substring(pre_malware_nb); | |
614 | } | |
615 | } | |
616 | } | |
617 | else { | |
618 | const char *drweb_s = NULL; | |
619 | ||
620 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
621 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
622 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
623 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
624 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
625 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
626 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
627 | * and others are ignored */ | |
628 | if (drweb_s) | |
629 | return m_errlog_defer_3(scanent, | |
630 | string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s), | |
631 | sock); | |
632 | ||
633 | /* no virus found */ | |
634 | malware_name = NULL; | |
635 | } | |
636 | break; | |
637 | } /* drweb */ | |
8e669ac1 | 638 | |
b1f8e4f8 JH |
639 | case M_AVES: /* "aveserver" scanner type -------------------------------- */ |
640 | { | |
641 | uschar buf[32768]; | |
642 | int result; | |
8544e77a | 643 | |
b1f8e4f8 JH |
644 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
645 | recv_line(sock, buf, sizeof(buf)); | |
8e669ac1 | 646 | |
b1f8e4f8 JH |
647 | if (buf[0] != '2') /* aveserver is having problems */ |
648 | return m_errlog_defer_3(scanent, | |
649 | string_sprintf("unavailable (Responded: %s).", | |
650 | ((buf[0] != 0) ? buf : (uschar *)"nothing") ), | |
651 | sock); | |
8e669ac1 | 652 | |
b1f8e4f8 JH |
653 | /* prepare our command */ |
654 | (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n", | |
655 | eml_filename); | |
8e669ac1 | 656 | |
b1f8e4f8 | 657 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name); |
8e669ac1 | 658 | |
b1f8e4f8 JH |
659 | /* and send it */ |
660 | if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0) | |
661 | return m_errlog_defer(scanent, errstr); | |
8e669ac1 | 662 | |
b1f8e4f8 JH |
663 | malware_name = NULL; |
664 | result = 0; | |
665 | /* read response lines, find malware name and final response */ | |
666 | while (recv_line(sock, buf, sizeof(buf)) > 0) { | |
667 | debug_printf("aveserver: %s\n", buf); | |
668 | if (buf[0] == '2') | |
669 | break; | |
670 | if (buf[0] == '5') { /* aveserver is having problems */ | |
671 | result = m_errlog_defer(scanent, | |
672 | string_sprintf("unable to scan file %s (Responded: %s).", | |
673 | eml_filename, buf)); | |
674 | break; | |
675 | } else if (Ustrncmp(buf,"322",3) == 0) { | |
676 | uschar *p = Ustrchr(&buf[4],' '); | |
677 | *p = '\0'; | |
678 | malware_name = string_copy(&buf[4]); | |
679 | } | |
680 | } | |
8e669ac1 | 681 | |
b1f8e4f8 JH |
682 | /* and send it */ |
683 | if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0) | |
684 | return m_errlog_defer(scanent, errstr); | |
8544e77a | 685 | |
b1f8e4f8 JH |
686 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
687 | recv_line(sock, buf, sizeof(buf)); | |
8544e77a | 688 | |
b1f8e4f8 JH |
689 | if (buf[0] != '2') /* aveserver is having problems */ |
690 | return m_errlog_defer_3(scanent, | |
691 | string_sprintf("unable to quit dialogue (Responded: %s).", | |
692 | ((buf[0] != 0) ? buf : (uschar *)"nothing") ), | |
693 | sock); | |
8e669ac1 | 694 | |
b1f8e4f8 JH |
695 | if (result == DEFER) { |
696 | (void)close(sock); | |
697 | return DEFER; | |
698 | } | |
699 | break; | |
700 | } /* aveserver */ | |
8e669ac1 | 701 | |
b1f8e4f8 JH |
702 | case M_FSEC: /* "fsecure" scanner type ---------------------------------- */ |
703 | { | |
704 | int i, j, bread = 0; | |
705 | uschar * file_name; | |
706 | uschar av_buffer[1024]; | |
707 | const pcre * fs_inf; | |
708 | static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n", | |
709 | US"CONFIGURE\tTIMEOUT\t0\n", | |
710 | US"CONFIGURE\tMAXARCH\t5\n", | |
711 | US"CONFIGURE\tMIME\t1\n" }; | |
8e669ac1 | 712 | |
b1f8e4f8 | 713 | malware_name = NULL; |
8523533c | 714 | |
b1f8e4f8 JH |
715 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
716 | scanner_name, scanner_options); | |
717 | ||
718 | /* pass options */ | |
719 | memset(av_buffer, 0, sizeof(av_buffer)); | |
720 | for (i=0; i != nelements(cmdopt); i++) { | |
721 | ||
722 | if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0) | |
723 | return m_errlog_defer(scanent, errstr); | |
724 | ||
725 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); | |
726 | if (bread >0) av_buffer[bread]='\0'; | |
727 | if (bread < 0) | |
728 | return m_errlog_defer_3(scanent, | |
729 | string_sprintf("unable to read answer %d (%s)", i, strerror(errno)), | |
730 | sock); | |
731 | for (j=0;j<bread;j++) | |
732 | if((av_buffer[j]=='\r')||(av_buffer[j]=='\n')) | |
733 | av_buffer[j] ='@'; | |
734 | } | |
8e669ac1 | 735 | |
b1f8e4f8 JH |
736 | /* pass the mailfile to fsecure */ |
737 | file_name = string_sprintf("SCAN\t%s\n", eml_filename); | |
738 | ||
739 | if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0) | |
740 | return m_errlog_defer(scanent, errstr); | |
741 | ||
742 | /* set up match */ | |
743 | /* todo also SUSPICION\t */ | |
744 | fs_inf = m_pcre_compile(US"\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr); | |
745 | ||
746 | /* read report, linewise */ | |
747 | do { | |
748 | i = 0; | |
749 | memset(av_buffer, 0, sizeof(av_buffer)); | |
750 | do { | |
751 | if ((bread= ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT)) < 0) | |
752 | return m_errlog_defer_3(scanent, | |
753 | string_sprintf("unable to read result (%s)", strerror(errno)), | |
754 | sock); | |
755 | } while (++i < sizeof(av_buffer)-1 && av_buffer[i-1] != '\n'); | |
756 | av_buffer[i-1] = '\0'; | |
757 | ||
758 | /* Really search for virus again? */ | |
759 | if (malware_name == NULL) | |
760 | /* try matcher on the line, grab substring */ | |
761 | malware_name = m_pcre_exec(fs_inf, av_buffer); | |
762 | } | |
763 | while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL); | |
764 | break; | |
765 | } /* fsecure */ | |
599dcb77 | 766 | |
b1f8e4f8 JH |
767 | case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */ |
768 | { | |
769 | time_t t; | |
770 | uschar tmpbuf[1024]; | |
771 | uschar * scanrequest; | |
772 | int kav_rc; | |
773 | unsigned long kav_reportlen, bread; | |
774 | const pcre *kav_re; | |
775 | uschar *p; | |
776 | ||
777 | /* get current date and time, build scan request */ | |
778 | time(&t); | |
779 | /* pdp note: before the eml_filename parameter, this scanned the | |
780 | directory; not finding documentation, so we'll strip off the directory. | |
781 | The side-effect is that the test framework scanning may end up in | |
782 | scanning more than was requested, but for the normal interface, this is | |
783 | fine. */ | |
784 | ||
785 | strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t)); | |
786 | scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename); | |
787 | p = Ustrrchr(scanrequest, '/'); | |
788 | if (p) | |
789 | *p = '\0'; | |
790 | ||
791 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
792 | scanner_name, scanner_options); | |
793 | ||
794 | /* send scan request */ | |
795 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
796 | return m_errlog_defer(scanent, errstr); | |
797 | ||
798 | /* wait for result */ | |
799 | if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) | |
800 | return m_errlog_defer_3(scanent, | |
801 | US"unable to read 2 bytes from socket.", sock); | |
802 | ||
803 | /* get errorcode from one nibble */ | |
804 | kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F; | |
805 | switch(kav_rc) | |
806 | { | |
807 | case 5: case 6: /* improper kavdaemon configuration */ | |
808 | return m_errlog_defer_3(scanent, | |
809 | US"please reconfigure kavdaemon to NOT disinfect or remove infected files.", | |
810 | sock); | |
811 | case 1: | |
812 | return m_errlog_defer_3(scanent, | |
813 | US"reported 'scanning not completed' (code 1).", sock); | |
814 | case 7: | |
815 | return m_errlog_defer_3(scanent, | |
816 | US"reported 'kavdaemon damaged' (code 7).", sock); | |
817 | } | |
599dcb77 | 818 | |
b1f8e4f8 JH |
819 | /* code 8 is not handled, since it is ambigous. It appears mostly on |
820 | bounces where part of a file has been cut off */ | |
821 | ||
822 | /* "virus found" return codes (2-4) */ | |
823 | if ((kav_rc > 1) && (kav_rc < 5)) { | |
824 | int report_flag = 0; | |
825 | ||
826 | /* setup default virus name */ | |
827 | malware_name = US"unknown"; | |
828 | ||
829 | report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ]; | |
830 | ||
831 | /* read the report, if available */ | |
832 | if( report_flag == 1 ) { | |
833 | /* read report size */ | |
834 | if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) | |
835 | return m_errlog_defer_3(scanent, | |
836 | US"cannot read report size", sock); | |
837 | ||
838 | /* it's possible that avp returns av_buffer[1] == 1 but the | |
839 | reportsize is 0 (!?) */ | |
840 | if (kav_reportlen > 0) { | |
841 | /* set up match regex, depends on retcode */ | |
842 | kav_re = m_pcre_compile( kav_rc == 3 | |
843 | ? US"suspicion:\\s*(.+?)\\s*$" | |
844 | : US"infected:\\s*(.+?)\\s*$", | |
845 | &errstr ); | |
846 | ||
847 | /* read report, linewise */ | |
848 | while (kav_reportlen > 0) { | |
849 | bread = 0; | |
850 | while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) { | |
851 | kav_reportlen--; | |
852 | if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break; | |
853 | bread++; | |
854 | } | |
855 | bread++; | |
856 | tmpbuf[bread] = '\0'; | |
857 | ||
858 | /* try matcher on the line, grab substring */ | |
859 | if ((malware_name = m_pcre_exec(kav_re, tmpbuf))) | |
860 | break; | |
861 | } | |
862 | } | |
863 | } | |
864 | } | |
865 | else /* no virus found */ | |
866 | malware_name = NULL; | |
599dcb77 | 867 | |
b1f8e4f8 | 868 | break; |
599dcb77 | 869 | } |
8544e77a | 870 | |
b1f8e4f8 JH |
871 | case M_CMDL: /* "cmdline" scanner type ---------------------------------- */ |
872 | { | |
873 | const uschar *cmdline_scanner = scanner_options; | |
874 | const pcre *cmdline_trigger_re; | |
875 | const pcre *cmdline_regex_re; | |
876 | uschar * file_name; | |
877 | uschar * commandline; | |
878 | void (*eximsigchld)(int); | |
879 | void (*eximsigpipe)(int); | |
880 | FILE *scanner_out = NULL; | |
881 | FILE *scanner_record = NULL; | |
882 | uschar linebuffer[32767]; | |
883 | int trigger = 0; | |
884 | uschar *p; | |
885 | ||
886 | if (!cmdline_scanner) | |
887 | return m_errlog_defer(scanent, errstr); | |
888 | ||
889 | /* find scanner output trigger */ | |
890 | cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
891 | "missing trigger specification", &errstr); | |
892 | if (!cmdline_trigger_re) | |
893 | return m_errlog_defer(scanent, errstr); | |
894 | ||
895 | /* find scanner name regex */ | |
896 | cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
897 | "missing virus name regex specification", &errstr); | |
898 | if (!cmdline_regex_re) | |
899 | return m_errlog_defer(scanent, errstr); | |
900 | ||
901 | /* prepare scanner call; despite the naming, file_name holds a directory | |
902 | name which is documented as the value given to %s. */ | |
903 | ||
904 | file_name = string_copy(eml_filename); | |
905 | p = Ustrrchr(file_name, '/'); | |
906 | if (p) | |
907 | *p = '\0'; | |
908 | commandline = string_sprintf(CS cmdline_scanner, file_name); | |
909 | ||
910 | /* redirect STDERR too */ | |
911 | commandline = string_sprintf("%s 2>&1", commandline); | |
912 | ||
913 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline); | |
914 | ||
915 | /* store exims signal handlers */ | |
916 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
917 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
918 | ||
919 | if (!(scanner_out = popen(CS commandline,"r"))) { | |
920 | int err = errno; | |
921 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
922 | return m_errlog_defer(scanent, | |
923 | string_sprintf("call (%s) failed: %s.", commandline, strerror(err))); | |
924 | } | |
94a18f28 | 925 | |
b1f8e4f8 JH |
926 | file_name = string_sprintf("%s/scan/%s/%s_scanner_output", |
927 | spool_directory, message_id, message_id); | |
928 | scanner_record = modefopen(file_name, "wb", SPOOL_MODE); | |
929 | ||
930 | if (scanner_record == NULL) { | |
931 | int err = errno; | |
932 | (void) pclose(scanner_out); | |
933 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
934 | return m_errlog_defer(scanent, | |
935 | string_sprintf("opening scanner output file (%s) failed: %s.", | |
936 | file_name, strerror(err))); | |
937 | } | |
8e669ac1 | 938 | |
b1f8e4f8 JH |
939 | /* look for trigger while recording output */ |
940 | while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) { | |
941 | if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) { | |
942 | /* short write */ | |
943 | (void) pclose(scanner_out); | |
944 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
945 | return m_errlog_defer(scanent, | |
946 | string_sprintf("short write on scanner output file (%s).", file_name)); | |
947 | } | |
948 | /* try trigger match */ | |
949 | if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1)) | |
950 | trigger = 1; | |
951 | } | |
8e669ac1 | 952 | |
b1f8e4f8 JH |
953 | (void)fclose(scanner_record); |
954 | sep = pclose(scanner_out); | |
955 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
956 | if (sep != 0) | |
b1f8e4f8 | 957 | return m_errlog_defer(scanent, |
2381c830 | 958 | sep == -1 |
e3dd1d67 JH |
959 | ? string_sprintf("running scanner failed: %s", strerror(sep)) |
960 | : string_sprintf("scanner returned error code: %d", sep)); | |
b1f8e4f8 JH |
961 | |
962 | if (trigger) { | |
963 | uschar * s; | |
964 | /* setup default virus name */ | |
965 | malware_name = US"unknown"; | |
966 | ||
967 | /* re-open the scanner output file, look for name match */ | |
968 | scanner_record = fopen(CS file_name, "rb"); | |
969 | while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) { | |
970 | /* try match */ | |
971 | if ((s = m_pcre_exec(cmdline_regex_re, linebuffer))) | |
972 | malware_name = s; | |
973 | } | |
974 | (void)fclose(scanner_record); | |
975 | } | |
976 | else /* no virus found */ | |
977 | malware_name = NULL; | |
978 | break; | |
979 | } /* cmdline */ | |
599dcb77 | 980 | |
b1f8e4f8 JH |
981 | case M_SOPHIE: /* "sophie" scanner type --------------------------------- */ |
982 | { | |
983 | int bread = 0; | |
984 | uschar *p; | |
985 | uschar * file_name; | |
986 | uschar av_buffer[1024]; | |
987 | ||
988 | /* pass the scan directory to sophie */ | |
989 | file_name = string_copy(eml_filename); | |
990 | if ((p = Ustrrchr(file_name, '/'))) | |
991 | *p = '\0'; | |
992 | ||
993 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
994 | scanner_name, scanner_options); | |
995 | ||
996 | if ( write(sock, file_name, Ustrlen(file_name)) < 0 | |
997 | || write(sock, "\n", 1) != 1 | |
998 | ) | |
999 | return m_errlog_defer_3(scanent, | |
1000 | string_sprintf("unable to write to UNIX socket (%s)", scanner_options), | |
1001 | sock); | |
1002 | ||
1003 | /* wait for result */ | |
1004 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1005 | if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) | |
1006 | return m_errlog_defer_3(scanent, | |
1007 | string_sprintf("unable to read from UNIX socket (%s)", scanner_options), | |
1008 | sock); | |
1009 | ||
1010 | /* infected ? */ | |
1011 | if (av_buffer[0] == '1') { | |
1012 | uschar * s = Ustrchr(av_buffer, '\n'); | |
1013 | if (s) | |
1014 | *s = '\0'; | |
1015 | malware_name = string_copy(&av_buffer[2]); | |
1016 | } | |
1017 | else if (!strncmp(CS av_buffer, "-1", 2)) | |
1018 | return m_errlog_defer_3(scanent, US"scanner reported error", sock); | |
1019 | else /* all ok, no virus */ | |
1020 | malware_name = NULL; | |
599dcb77 | 1021 | |
b1f8e4f8 | 1022 | break; |
8544e77a | 1023 | } |
8e669ac1 | 1024 | |
b1f8e4f8 JH |
1025 | case M_CLAMD: /* "clamd" scanner type ----------------------------------- */ |
1026 | { | |
1027 | /* This code was originally contributed by David Saez */ | |
1028 | /* There are three scanning methods available to us: | |
1029 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1030 | * (2) Use the STREAM command, send the data on a separate port | |
1031 | * (3) Use the zINSTREAM command, send the data inline | |
1032 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1033 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1034 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
1035 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless | |
1036 | * WITH_OLD_CLAMAV_STREAM is defined. | |
1037 | * See Exim bug 926 for details. */ | |
1038 | ||
1039 | uschar *p, *vname, *result_tag, *response_end; | |
1040 | int bread=0; | |
b1f8e4f8 JH |
1041 | uschar * file_name; |
1042 | uschar av_buffer[1024]; | |
1043 | uschar *hostname = US""; | |
1044 | host_item connhost; | |
1045 | uschar *clamav_fbuf; | |
1046 | int clam_fd, result; | |
cb54b2a0 PP |
1047 | off_t fsize; |
1048 | unsigned int fsize_uint; | |
b1f8e4f8 JH |
1049 | BOOL use_scan_command = FALSE; |
1050 | clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS]; | |
1051 | int current_server; | |
1052 | int num_servers = 0; | |
1053 | #ifdef WITH_OLD_CLAMAV_STREAM | |
af4a1bca | 1054 | unsigned int port; |
b1f8e4f8 JH |
1055 | uschar av_buffer2[1024]; |
1056 | int sockData; | |
1057 | #else | |
1058 | uint32_t send_size, send_final_zeroblock; | |
1059 | #endif | |
1060 | ||
1061 | if (*scanner_options == '/') | |
1062 | /* Local file; so we def want to use_scan_command and don't want to try | |
1063 | * passing IP/port combinations */ | |
1064 | use_scan_command = TRUE; | |
1065 | else { | |
1066 | const uschar *address = scanner_options; | |
1067 | uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20]; | |
1068 | ||
1069 | /* Go through the rest of the list of host/port and construct an array | |
1070 | * of servers to try. The first one is the bit we just passed from | |
1071 | * scanner_options so process that first and then scan the remainder of | |
1072 | * the address buffer */ | |
1073 | do { | |
1074 | clamd_address_container *this_clamd; | |
1075 | ||
1076 | /* The 'local' option means use the SCAN command over the network | |
1077 | * socket (ie common file storage in use) */ | |
1078 | if (strcmpic(address,US"local") == 0) { | |
1079 | use_scan_command = TRUE; | |
1080 | continue; | |
1081 | } | |
1082 | ||
1083 | /* XXX: If unsuccessful we should free this memory */ | |
1084 | this_clamd = | |
1085 | (clamd_address_container *)store_get(sizeof(clamd_address_container)); | |
1086 | ||
1087 | /* extract host and port part */ | |
1088 | if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u", | |
1089 | this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) { | |
1090 | (void) m_errlog_defer(scanent, | |
1091 | string_sprintf("invalid address '%s'", address)); | |
1092 | continue; | |
1093 | } | |
1094 | ||
1095 | clamd_address_vector[num_servers] = this_clamd; | |
1096 | num_servers++; | |
1097 | if (num_servers >= MAX_CLAMD_SERVERS) { | |
1098 | (void) m_errlog_defer(scanent, | |
1099 | US"More than " MAX_CLAMD_SERVERS_S " clamd servers " | |
1100 | "specified; only using the first " MAX_CLAMD_SERVERS_S ); | |
1101 | break; | |
1102 | } | |
1103 | } while ((address = string_nextinlist(&av_scanner_work, &sep, | |
1104 | address_buffer, | |
1105 | sizeof(address_buffer))) != NULL); | |
1106 | ||
1107 | /* check if we have at least one server */ | |
1108 | if (!num_servers) | |
1109 | return m_errlog_defer(scanent, | |
1110 | US"no useable server addresses in malware configuration option."); | |
1111 | } | |
8e669ac1 | 1112 | |
b1f8e4f8 JH |
1113 | /* See the discussion of response formats below to see why we really don't |
1114 | like colons in filenames when passing filenames to ClamAV. */ | |
1115 | if (use_scan_command && Ustrchr(eml_filename, ':')) | |
1116 | return m_errlog_defer(scanent, | |
1117 | string_sprintf("local/SCAN mode incompatible with" \ | |
1118 | " : in path to email filename [%s]", eml_filename)); | |
1119 | ||
1120 | /* We have some network servers specified */ | |
1121 | if (num_servers) { | |
1122 | ||
1123 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd | |
1124 | * only supports AF_INET, but we should probably be looking to the | |
1125 | * future and rewriting this to be protocol-independent anyway. */ | |
1126 | ||
1127 | while ( num_servers > 0 ) { | |
1128 | /* Randomly pick a server to start with */ | |
1129 | current_server = random_number( num_servers ); | |
1130 | ||
1131 | debug_printf("trying server name %s, port %u\n", | |
1132 | clamd_address_vector[current_server]->tcp_addr, | |
1133 | clamd_address_vector[current_server]->tcp_port); | |
1134 | ||
1135 | /* Lookup the host. This is to ensure that we connect to the same IP | |
1136 | * on both connections (as one host could resolve to multiple ips) */ | |
1137 | sock= m_tcpsocket(clamd_address_vector[current_server]->tcp_addr, | |
1138 | clamd_address_vector[current_server]->tcp_port, | |
1139 | &connhost, &errstr); | |
1140 | if (sock >= 0) { | |
1141 | /* Connection successfully established with a server */ | |
1142 | hostname = clamd_address_vector[current_server]->tcp_addr; | |
1143 | break; | |
1144 | } | |
1145 | ||
1146 | (void) m_errlog_defer(scanent, errstr); | |
1147 | ||
1148 | /* Remove the server from the list. XXX We should free the memory */ | |
1149 | num_servers--; | |
1150 | int i; | |
1151 | for( i = current_server; i < num_servers; i++ ) | |
1152 | clamd_address_vector[i] = clamd_address_vector[i+1]; | |
1153 | } | |
1154 | ||
1155 | if ( num_servers == 0 ) | |
1156 | return m_errlog_defer(scanent, US"all servers failed"); | |
1157 | ||
1158 | } else { | |
1159 | if ((sock = m_unixsocket(scanner_options, &errstr)) < 0) | |
1160 | return m_errlog_defer(scanent, errstr); | |
1161 | } | |
8e669ac1 | 1162 | |
b1f8e4f8 JH |
1163 | /* have socket in variable "sock"; command to use is semi-independent of |
1164 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1165 | * domain socket, or explicitly told local) else we stream the data. | |
1166 | * How we stream the data depends upon how we were built. */ | |
1167 | ||
1168 | if (!use_scan_command) { | |
1169 | ||
1170 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1171 | /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to | |
1172 | * that port on a second connection; then in the scan-method-neutral | |
1173 | * part, read the response back on the original connection. */ | |
1174 | ||
1175 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n", | |
1176 | scanner_name); | |
1177 | ||
1178 | /* Pass the string to ClamAV (7 = "STREAM\n") */ | |
1179 | if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0) | |
1180 | return m_errlog_defer(scanent, errstr); | |
1181 | ||
1182 | memset(av_buffer2, 0, sizeof(av_buffer2)); | |
1183 | bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT); | |
1184 | ||
1185 | if (bread < 0) | |
1186 | return m_errlog_defer_3(scanent, | |
1187 | string_sprintf("unable to read PORT from socket (%s)", | |
1188 | strerror(errno)), | |
1189 | sock); | |
1190 | ||
1191 | if (bread == sizeof(av_buffer2)) | |
1192 | return m_errlog_defer_3(scanent, "buffer too small", sock); | |
1193 | ||
1194 | if (!(*av_buffer2)) | |
1195 | return m_errlog_defer_3(scanent, "ClamAV returned null", sock); | |
1196 | ||
1197 | av_buffer2[bread] = '\0'; | |
1198 | if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) | |
1199 | return m_errlog_defer_3(scanent, | |
1200 | string_sprintf("Expected port information from clamd, got '%s'", | |
1201 | av_buffer2), | |
1202 | sock); | |
1203 | ||
1204 | sockData = m_tcpsocket(connhost.address, port, NULL, &errstr); | |
1205 | if (sockData < 0) | |
1206 | return m_errlog_defer_3(scanent, errstr, sock); | |
1207 | ||
1208 | #define CLOSE_SOCKDATA (void)close(sockData) | |
1209 | #else /* WITH_OLD_CLAMAV_STREAM not defined */ | |
1210 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> | |
1211 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1212 | chunk. */ | |
1213 | ||
1214 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", | |
1215 | scanner_name); | |
1216 | ||
1217 | /* Pass the string to ClamAV (10 = "zINSTREAM\0") */ | |
1218 | if (send(sock, "zINSTREAM", 10, 0) < 0) | |
1219 | return m_errlog_defer_3(scanent, | |
1220 | string_sprintf("unable to send zINSTREAM to socket (%s)", | |
1221 | strerror(errno)), | |
1222 | sock); | |
1223 | ||
1224 | #define CLOSE_SOCKDATA /**/ | |
1225 | #endif | |
1226 | ||
1227 | /* calc file size */ | |
1228 | if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) { | |
1229 | int err = errno; | |
1230 | CLOSE_SOCKDATA; | |
1231 | return m_errlog_defer_3(scanent, | |
1232 | string_sprintf("can't open spool file %s: %s", | |
1233 | eml_filename, strerror(err)), | |
1234 | sock); | |
1235 | } | |
1236 | if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) { | |
1237 | int err = errno; | |
1238 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
1239 | return m_errlog_defer_3(scanent, | |
1240 | string_sprintf("can't seek spool file %s: %s", | |
1241 | eml_filename, strerror(err)), | |
1242 | sock); | |
1243 | } | |
cb54b2a0 PP |
1244 | fsize_uint = (unsigned int) fsize; |
1245 | if ((off_t)fsize_uint != fsize) { | |
1246 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
1247 | return m_errlog_defer_3(scanent, | |
1248 | string_sprintf("seeking spool file %s, size overflow", | |
1249 | eml_filename), | |
1250 | sock); | |
1251 | } | |
b1f8e4f8 JH |
1252 | lseek(clam_fd, 0, SEEK_SET); |
1253 | ||
cb54b2a0 | 1254 | if (!(clamav_fbuf = (uschar *) malloc (fsize_uint))) { |
b1f8e4f8 JH |
1255 | CLOSE_SOCKDATA; (void)close(clam_fd); |
1256 | return m_errlog_defer_3(scanent, | |
1257 | string_sprintf("unable to allocate memory %u for file (%s)", | |
cb54b2a0 | 1258 | fsize_uint, eml_filename), |
b1f8e4f8 JH |
1259 | sock); |
1260 | } | |
1261 | ||
cb54b2a0 | 1262 | if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0) { |
b1f8e4f8 JH |
1263 | int err = errno; |
1264 | free(clamav_fbuf); CLOSE_SOCKDATA; (void)close(clam_fd); | |
1265 | return m_errlog_defer_3(scanent, | |
1266 | string_sprintf("can't read spool file %s: %s", | |
1267 | eml_filename, strerror(err)), | |
1268 | sock); | |
1269 | } | |
1270 | (void)close(clam_fd); | |
1271 | ||
1272 | /* send file body to socket */ | |
1273 | #ifdef WITH_OLD_CLAMAV_STREAM | |
cb54b2a0 | 1274 | if (send(sockData, clamav_fbuf, fsize_uint, 0) < 0) { |
b1f8e4f8 JH |
1275 | free(clamav_fbuf); CLOSE_SOCKDATA; |
1276 | return m_errlog_defer_3(scanent, | |
1277 | string_sprintf("unable to send file body to socket (%s:%u)", | |
1278 | hostname, port), | |
1279 | sock); | |
1280 | } | |
1281 | #else | |
cb54b2a0 | 1282 | send_size = htonl(fsize_uint); |
b1f8e4f8 JH |
1283 | send_final_zeroblock = 0; |
1284 | if ((send(sock, &send_size, sizeof(send_size), 0) < 0) || | |
cb54b2a0 | 1285 | (send(sock, clamav_fbuf, fsize_uint, 0) < 0) || |
b1f8e4f8 JH |
1286 | (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) |
1287 | { | |
1288 | free(clamav_fbuf); | |
1289 | return m_errlog_defer_3(scanent, | |
e3dd1d67 | 1290 | string_sprintf("unable to send file body to socket (%s)", hostname), |
b1f8e4f8 JH |
1291 | sock); |
1292 | } | |
1293 | #endif | |
1294 | ||
1295 | free(clamav_fbuf); | |
1296 | ||
1297 | CLOSE_SOCKDATA; | |
1298 | #undef CLOSE_SOCKDATA | |
1299 | ||
1300 | } else { /* use scan command */ | |
1301 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1302 | * scan-method-neutral part, read the response back */ | |
1303 | ||
1304 | /* ================================================================= */ | |
1305 | ||
1306 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1307 | which dates to when ClamAV needed us to break apart the email into the | |
1308 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1309 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1310 | doing this would actually have resulted in the mail attachments being | |
1311 | scanned twice, in the broken out files and from the original .eml. | |
1312 | Since ClamAV now handles emails (and has for quite some time) we can | |
1313 | just use the email file itself. */ | |
1314 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ | |
1315 | file_name = string_sprintf("SCAN %s\n", eml_filename); | |
1316 | ||
1317 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n", | |
1318 | scanner_name, scanner_options); | |
1319 | ||
1320 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) | |
1321 | return m_errlog_defer_3(scanent, | |
1322 | string_sprintf("unable to write to socket (%s)", strerror(errno)), | |
1323 | sock); | |
1324 | ||
1325 | /* Do not shut down the socket for writing; a user report noted that | |
1326 | * clamd 0.70 does not react well to this. */ | |
1327 | } | |
1328 | /* Commands have been sent, no matter which scan method or connection | |
1329 | * type we're using; now just read the result, independent of method. */ | |
1330 | ||
1331 | /* Read the result */ | |
1332 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1333 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT); | |
1334 | (void)close(sock); | |
1335 | sock = -1; | |
1336 | ||
1337 | if (!(bread > 0)) | |
1338 | return m_errlog_defer(scanent, | |
1339 | string_sprintf("unable to read from socket (%s)", strerror(errno))); | |
1340 | ||
1341 | if (bread == sizeof(av_buffer)) | |
1342 | return m_errlog_defer(scanent, US"buffer too small"); | |
1343 | /* We're now assured of a NULL at the end of av_buffer */ | |
1344 | ||
1345 | /* Check the result. ClamAV returns one of two result formats. | |
1346 | In the basic mode, the response is of the form: | |
1347 | infected: -> "<filename>: <virusname> FOUND" | |
1348 | not-infected: -> "<filename>: OK" | |
1349 | error: -> "<filename>: <errcode> ERROR | |
1350 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1351 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1352 | for the infected case. Compare: | |
1353 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1354 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1355 | ||
1356 | In the streaming case, clamd uses the filename "stream" which you should | |
1357 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1358 | client app will replace "stream" with the original filename before returning | |
1359 | results to stdout, but the trace shows the data). | |
1360 | ||
1361 | We will assume that the pathname passed to clamd from Exim does not contain | |
1362 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1363 | passing a filename to clamd). */ | |
1364 | ||
1365 | if (!(*av_buffer)) | |
1366 | return m_errlog_defer(scanent, US"ClamAV returned null"); | |
1367 | ||
1368 | /* strip newline at the end (won't be present for zINSTREAM) | |
1369 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1370 | this below, so double-check) */ | |
1371 | p = av_buffer + Ustrlen(av_buffer) - 1; | |
1372 | if (*p == '\n') *p = '\0'; | |
1373 | ||
1374 | DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer); | |
1375 | ||
1376 | while (isspace(*--p) && (p > av_buffer)) | |
1377 | *p = '\0'; | |
1378 | if (*p) ++p; | |
1379 | response_end = p; | |
1380 | ||
1381 | /* colon in returned output? */ | |
1382 | if((p = Ustrchr(av_buffer,':')) == NULL) | |
1383 | return m_errlog_defer(scanent, | |
1384 | string_sprintf("ClamAV returned malformed result (missing colon): %s", | |
1385 | av_buffer)); | |
1386 | ||
1387 | /* strip filename */ | |
1388 | while (*p && isspace(*++p)) /**/; | |
1389 | vname = p; | |
1390 | ||
1391 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1392 | but we should at least be resistant to it. */ | |
1393 | p = Ustrrchr(vname, ' '); | |
1394 | result_tag = p ? p+1 : vname; | |
1395 | ||
1396 | if (Ustrcmp(result_tag, "FOUND") == 0) { | |
1397 | /* p should still be the whitespace before the result_tag */ | |
1398 | while (isspace(*p)) --p; | |
1399 | *++p = '\0'; | |
1400 | /* Strip off the extended information too, which will be in parens | |
1401 | after the virus name, with no intervening whitespace. */ | |
1402 | if (*--p == ')') { | |
1403 | /* "(hash:size)", so previous '(' will do; if not found, we have | |
1404 | a curious virus name, but not an error. */ | |
1405 | p = Ustrrchr(vname, '('); | |
1406 | if (p) | |
1407 | *p = '\0'; | |
1408 | } | |
1409 | malware_name = string_copy(vname); | |
1410 | DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name); | |
1411 | ||
1412 | } else if (Ustrcmp(result_tag, "ERROR") == 0) | |
1413 | return m_errlog_defer(scanent, | |
1414 | string_sprintf("ClamAV returned: %s", av_buffer)); | |
1415 | ||
1416 | else if (Ustrcmp(result_tag, "OK") == 0) { | |
1417 | /* Everything should be OK */ | |
1418 | malware_name = NULL; | |
1419 | DEBUG(D_acl) debug_printf("Malware not found\n"); | |
1420 | ||
1421 | } else | |
1422 | return m_errlog_defer(scanent, | |
1423 | string_sprintf("unparseable response from ClamAV: {%s}", av_buffer)); | |
1424 | ||
1425 | break; | |
1426 | } /* clamd */ | |
1427 | ||
1428 | case M_SOCK: /* "sock" scanner type ------------------------------------- */ | |
1429 | /* This code was derived by Martin Poole from the clamd code contributed | |
1430 | by David Saez and the cmdline code | |
1431 | */ | |
1432 | { | |
1433 | int bread; | |
1434 | uschar * commandline; | |
1435 | uschar av_buffer[1024]; | |
1436 | uschar * linebuffer; | |
1437 | uschar * sockline_scanner; | |
1438 | uschar sockline_scanner_default[] = "%s\n"; | |
1439 | const pcre *sockline_trig_re; | |
1440 | const pcre *sockline_name_re; | |
1441 | ||
1442 | /* find scanner command line */ | |
1443 | if ((sockline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
1444 | NULL, 0))) | |
1445 | { /* check for no expansions apart from one %s */ | |
1446 | char * s = index(CS sockline_scanner, '%'); | |
1447 | if (s++) | |
1448 | if ((*s != 's' && *s != '%') || index(s+1, '%')) | |
1449 | return m_errlog_defer_3(scanent, | |
1450 | US"unsafe sock scanner call spec", sock); | |
1451 | } | |
1452 | else | |
1453 | sockline_scanner = sockline_scanner_default; | |
1454 | ||
1455 | /* find scanner output trigger */ | |
1456 | sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1457 | "missing trigger specification", &errstr); | |
1458 | if (!sockline_trig_re) | |
1459 | return m_errlog_defer_3(scanent, errstr, sock); | |
1460 | ||
1461 | /* find virus name regex */ | |
1462 | sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1463 | "missing virus name regex specification", &errstr); | |
1464 | if (!sockline_name_re) | |
1465 | return m_errlog_defer_3(scanent, errstr, sock); | |
1466 | ||
1467 | /* prepare scanner call - security depends on expansions check above */ | |
1468 | commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id); | |
1469 | commandline = string_sprintf( CS sockline_scanner, CS commandline); | |
1470 | ||
1471 | ||
1472 | /* Pass the command string to the socket */ | |
1473 | if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0) | |
1474 | return m_errlog_defer(scanent, errstr); | |
1475 | ||
1476 | /* Read the result */ | |
1477 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1478 | bread = read(sock, av_buffer, sizeof(av_buffer)); | |
1479 | ||
1480 | if (!(bread > 0)) | |
1481 | return m_errlog_defer_3(scanent, | |
1482 | string_sprintf("unable to read from socket (%s)", strerror(errno)), | |
1483 | sock); | |
1484 | ||
1485 | if (bread == sizeof(av_buffer)) | |
1486 | return m_errlog_defer_3(scanent, US"buffer too small", sock); | |
1487 | linebuffer = string_copy(av_buffer); | |
1488 | ||
1489 | /* try trigger match */ | |
1490 | if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) { | |
1491 | if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer))) | |
1492 | malware_name = US "unknown"; | |
1493 | } | |
1494 | else /* no virus found */ | |
1495 | malware_name = NULL; | |
1496 | break; | |
8523533c | 1497 | } |
8e669ac1 | 1498 | |
b1f8e4f8 JH |
1499 | case M_MKSD: /* "mksd" scanner type ------------------------------------- */ |
1500 | { | |
1501 | char *mksd_options_end; | |
1502 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1503 | int sock; | |
1504 | int retval; | |
1505 | ||
1506 | if (scanner_options) { | |
1507 | mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10); | |
1508 | if ( *scanner_options == '\0' | |
1509 | || *mksd_options_end != '\0' | |
1510 | || mksd_maxproc < 1 | |
1511 | || mksd_maxproc > 32 | |
1512 | ) | |
1513 | return m_errlog_defer(scanent, | |
1514 | string_sprintf("invalid option '%s'", scanner_options)); | |
1515 | } | |
8e669ac1 | 1516 | |
b1f8e4f8 JH |
1517 | if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0) |
1518 | return m_errlog_defer(scanent, errstr); | |
8e669ac1 | 1519 | |
94a18f28 | 1520 | malware_name = NULL; |
94a18f28 | 1521 | |
b1f8e4f8 | 1522 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name); |
94a18f28 | 1523 | |
b1f8e4f8 JH |
1524 | if ((retval = mksd_scan_packed(scanent, sock, eml_filename)) != OK) { |
1525 | close (sock); | |
1526 | return retval; | |
1527 | } | |
1528 | break; | |
8523533c | 1529 | } |
8523533c | 1530 | } |
8523533c | 1531 | |
b1f8e4f8 JH |
1532 | if (sock >= 0) |
1533 | (void) close (sock); | |
1534 | malware_ok = TRUE; /* set "been here, done that" marker */ | |
1535 | } | |
8523533c TK |
1536 | |
1537 | /* match virus name against pattern (caseless ------->----------v) */ | |
b1f8e4f8 | 1538 | if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) { |
8544e77a | 1539 | DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name); |
8523533c TK |
1540 | return OK; |
1541 | } | |
b1f8e4f8 | 1542 | else |
8523533c | 1543 | return FAIL; |
8523533c TK |
1544 | } |
1545 | ||
1546 | ||
1547 | /* simple wrapper for reading lines from sockets */ | |
b1f8e4f8 JH |
1548 | int |
1549 | recv_line(int sock, uschar *buffer, int size) | |
1550 | { | |
8523533c TK |
1551 | uschar *p = buffer; |
1552 | ||
1553 | memset(buffer,0,size); | |
1554 | /* read until \n */ | |
1555 | while(recv(sock,p,1,0) > -1) { | |
1556 | if ((p-buffer) > (size-2)) break; | |
1557 | if (*p == '\n') break; | |
1558 | if (*p != '\r') p++; | |
b1f8e4f8 | 1559 | } |
8523533c TK |
1560 | *p = '\0'; |
1561 | ||
1562 | return (p-buffer); | |
1563 | } | |
1564 | ||
1565 | ||
1566 | /* ============= private routines for the "mksd" scanner type ============== */ | |
1567 | ||
1568 | #include <sys/uio.h> | |
1569 | ||
b1f8e4f8 JH |
1570 | static inline int |
1571 | mksd_writev (int sock, struct iovec *iov, int iovcnt) | |
8523533c TK |
1572 | { |
1573 | int i; | |
8e669ac1 | 1574 | |
8523533c TK |
1575 | for (;;) { |
1576 | do | |
1577 | i = writev (sock, iov, iovcnt); | |
1578 | while ((i < 0) && (errno == EINTR)); | |
1579 | if (i <= 0) { | |
b1f8e4f8 | 1580 | (void) malware_errlog_defer(US"unable to write to mksd UNIX socket (/var/run/mksd/socket)"); |
8523533c TK |
1581 | return -1; |
1582 | } | |
8e669ac1 | 1583 | |
8523533c TK |
1584 | for (;;) |
1585 | if (i >= iov->iov_len) { | |
1586 | if (--iovcnt == 0) | |
1587 | return 0; | |
1588 | i -= iov->iov_len; | |
1589 | iov++; | |
1590 | } else { | |
1591 | iov->iov_len -= i; | |
1592 | iov->iov_base = CS iov->iov_base + i; | |
1593 | break; | |
1594 | } | |
1595 | } | |
1596 | } | |
1597 | ||
b1f8e4f8 JH |
1598 | static inline int |
1599 | mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size) | |
8523533c TK |
1600 | { |
1601 | int offset = 0; | |
1602 | int i; | |
8e669ac1 | 1603 | |
8523533c TK |
1604 | do { |
1605 | if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) { | |
b1f8e4f8 | 1606 | (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)"); |
8523533c TK |
1607 | return -1; |
1608 | } | |
8e669ac1 | 1609 | |
8523533c TK |
1610 | offset += i; |
1611 | /* offset == av_buffer_size -> buffer full */ | |
1612 | if (offset == av_buffer_size) { | |
b1f8e4f8 | 1613 | (void) malware_errlog_defer(US"malformed reply received from mksd"); |
8523533c TK |
1614 | return -1; |
1615 | } | |
1616 | } while (av_buffer[offset-1] != '\n'); | |
8e669ac1 | 1617 | |
8523533c TK |
1618 | av_buffer[offset] = '\0'; |
1619 | return offset; | |
1620 | } | |
1621 | ||
b1f8e4f8 JH |
1622 | static inline int |
1623 | mksd_parse_line(struct scan * scanent, char *line) | |
8523533c TK |
1624 | { |
1625 | char *p; | |
8e669ac1 | 1626 | |
8523533c | 1627 | switch (*line) { |
b1f8e4f8 | 1628 | case 'O': /* OK */ |
8523533c | 1629 | return OK; |
b1f8e4f8 | 1630 | |
8523533c | 1631 | case 'E': |
b1f8e4f8 | 1632 | case 'A': /* ERR */ |
8523533c | 1633 | if ((p = strchr (line, '\n')) != NULL) |
b1f8e4f8 JH |
1634 | *p = '\0'; |
1635 | return m_errlog_defer(scanent, | |
1636 | string_sprintf("scanner failed: %s", line)); | |
1637 | ||
1638 | default: /* VIR */ | |
8523533c | 1639 | if ((p = strchr (line, '\n')) != NULL) { |
b1f8e4f8 JH |
1640 | *p = '\0'; |
1641 | if (((p-line) > 5) && (line[3] == ' ')) | |
8523533c | 1642 | if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) { |
b1f8e4f8 JH |
1643 | *p = '\0'; |
1644 | malware_name = string_copy(US line+4); | |
8523533c TK |
1645 | return OK; |
1646 | } | |
1647 | } | |
b1f8e4f8 JH |
1648 | return m_errlog_defer(scanent, |
1649 | string_sprintf("malformed reply received: %s", line)); | |
8523533c TK |
1650 | } |
1651 | } | |
1652 | ||
b1f8e4f8 JH |
1653 | static int |
1654 | mksd_scan_packed(struct scan * scanent, int sock, uschar *scan_filename) | |
8523533c | 1655 | { |
8544e77a | 1656 | struct iovec iov[3]; |
1ba28e2b | 1657 | const char *cmd = "MSQ\n"; |
8523533c | 1658 | uschar av_buffer[1024]; |
8e669ac1 | 1659 | |
1ba28e2b | 1660 | iov[0].iov_base = (void *) cmd; |
8523533c | 1661 | iov[0].iov_len = 3; |
8544e77a PP |
1662 | iov[1].iov_base = CS scan_filename; |
1663 | iov[1].iov_len = Ustrlen(scan_filename); | |
f1a29782 | 1664 | iov[2].iov_base = (void *) (cmd + 3); |
8544e77a PP |
1665 | iov[2].iov_len = 1; |
1666 | ||
1667 | if (mksd_writev (sock, iov, 3) < 0) | |
8523533c | 1668 | return DEFER; |
8e669ac1 | 1669 | |
8523533c TK |
1670 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0) |
1671 | return DEFER; | |
8e669ac1 | 1672 | |
b1f8e4f8 | 1673 | return mksd_parse_line (scanent, CS av_buffer); |
8523533c TK |
1674 | } |
1675 | ||
b1f8e4f8 JH |
1676 | #endif /*WITH_CONTENT_SCAN*/ |
1677 | /* | |
1678 | * vi: aw ai sw=2 | |
1679 | */ |