Commit | Line | Data |
---|---|---|
8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
3386088d | 5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 */ |
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 | 13 | typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL, |
b6fbf22d | 14 | M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD, M_AVAST} scanner_t; |
b1f8e4f8 JH |
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 }, | |
b6fbf22d | 34 | { M_AVAST, US"avast", US"/var/run/avast/scan.sock", MC_STRM }, |
b1f8e4f8 JH |
35 | { -1, NULL, NULL, MC_NONE } /* end-marker */ |
36 | }; | |
37 | ||
599dcb77 TL |
38 | /* The maximum number of clamd servers that are supported in the configuration */ |
39 | #define MAX_CLAMD_SERVERS 32 | |
40 | #define MAX_CLAMD_SERVERS_S "32" | |
599dcb77 | 41 | |
8a512ed5 JH |
42 | typedef struct clamd_address { |
43 | uschar * hostspec; | |
44 | unsigned tcp_port; | |
45 | unsigned retry; | |
46 | } clamd_address; | |
599dcb77 | 47 | |
b1f8e4f8 JH |
48 | #ifndef nelements |
49 | # define nelements(arr) (sizeof(arr) / sizeof(arr[0])) | |
8523533c TK |
50 | #endif |
51 | ||
a9ccd69a | 52 | |
0f0c8159 | 53 | #define MALWARE_TIMEOUT 120 /* default timeout, seconds */ |
a9ccd69a PH |
54 | |
55 | ||
8523533c TK |
56 | #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ |
57 | #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
58 | #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
59 | ||
2376f2f5 TK |
60 | #define DERR_READ_ERR (1<<0) /* read error */ |
61 | #define DERR_NOMEMORY (1<<2) /* no memory */ | |
62 | #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
63 | #define DERR_BAD_CALL (1<<15) /* wrong command */ | |
64 | ||
476be7e2 JH |
65 | |
66 | static const uschar * malware_regex_default = US ".+"; | |
67 | static const pcre * malware_default_re = NULL; | |
68 | ||
69 | static const uschar * drweb_re_str = US "infected\\swith\\s*(.+?)$"; | |
70 | static const pcre * drweb_re = NULL; | |
71 | ||
72 | static const uschar * fsec_re_str = US "\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$"; | |
73 | static const pcre * fsec_re = NULL; | |
74 | ||
75 | static const uschar * kav_re_sus_str = US "suspicion:\\s*(.+?)\\s*$"; | |
76 | static const uschar * kav_re_inf_str = US "infected:\\s*(.+?)\\s*$"; | |
77 | static const pcre * kav_re_sus = NULL; | |
78 | static const pcre * kav_re_inf = NULL; | |
79 | ||
80 | static const uschar * ava_re_clean_str = US "(?!\\\\)\\t\\[\\+\\]"; | |
81 | static const uschar * ava_re_virus_str = US "(?!\\\\)\\t\\[L\\]\\d\\.\\d\\t\\d\\s(.*)"; | |
82 | static const pcre * ava_re_clean = NULL; | |
83 | static const pcre * ava_re_virus = NULL; | |
84 | ||
85 | ||
86 | ||
87 | /******************************************************************************/ | |
88 | ||
b1f8e4f8 | 89 | /* Routine to check whether a system is big- or little-endian. |
8523533c TK |
90 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
91 | Needed for proper kavdaemon implementation. Sigh. */ | |
92 | #define BIG_MY_ENDIAN 0 | |
93 | #define LITTLE_MY_ENDIAN 1 | |
b1f8e4f8 JH |
94 | static int test_byte_order(void); |
95 | static inline int | |
96 | test_byte_order() | |
97 | { | |
98 | short int word = 0x0001; | |
99 | char *byte = (char *) &word; | |
100 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); | |
8523533c TK |
101 | } |
102 | ||
b1f8e4f8 | 103 | BOOL malware_ok = FALSE; |
8523533c | 104 | |
8544e77a PP |
105 | /* Gross hacks for the -bmalware option; perhaps we should just create |
106 | the scan directory normally for that case, but look into rigging up the | |
107 | needed header variables if not already set on the command-line? */ | |
108 | extern int spool_mbox_ok; | |
109 | extern uschar spooled_message_id[17]; | |
110 | ||
8544e77a PP |
111 | |
112 | ||
b1f8e4f8 JH |
113 | static inline int |
114 | malware_errlog_defer(const uschar * str) | |
115 | { | |
8a512ed5 JH |
116 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str); |
117 | return DEFER; | |
b1f8e4f8 JH |
118 | } |
119 | ||
120 | static int | |
121 | m_errlog_defer(struct scan * scanent, const uschar * str) | |
122 | { | |
8a512ed5 | 123 | return malware_errlog_defer(string_sprintf("%s: %s", scanent->name, str)); |
b1f8e4f8 JH |
124 | } |
125 | static int | |
126 | m_errlog_defer_3(struct scan * scanent, const uschar * str, | |
127 | int fd_to_close) | |
128 | { | |
8a512ed5 JH |
129 | (void) close(fd_to_close); |
130 | return m_errlog_defer(scanent, str); | |
b1f8e4f8 JH |
131 | } |
132 | ||
133 | /*************************************************/ | |
134 | ||
135 | /* Only used by the Clamav code, which is working from a list of servers and | |
136 | uses the returned in_addr to get a second connection to the same system. | |
137 | */ | |
138 | static inline int | |
139 | m_tcpsocket(const uschar * hostname, unsigned int port, | |
140 | host_item * host, uschar ** errstr) | |
141 | { | |
8a512ed5 | 142 | return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr); |
b1f8e4f8 JH |
143 | } |
144 | ||
b1f8e4f8 JH |
145 | static int |
146 | m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr) | |
147 | { | |
8a512ed5 JH |
148 | if (send(sock, buf, cnt, 0) < 0) |
149 | { | |
150 | int err = errno; | |
151 | (void)close(sock); | |
152 | *errstr = string_sprintf("unable to send to socket (%s): %s", | |
153 | buf, strerror(err)); | |
154 | return -1; | |
155 | } | |
156 | return sock; | |
b1f8e4f8 JH |
157 | } |
158 | ||
159 | static const pcre * | |
160 | m_pcre_compile(const uschar * re, uschar ** errstr) | |
161 | { | |
8a512ed5 JH |
162 | const uschar * rerror; |
163 | int roffset; | |
164 | const pcre * cre; | |
165 | ||
166 | cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
167 | if (!cre) | |
168 | *errstr= string_sprintf("regular expression error in '%s': %s at offset %d", | |
169 | re, rerror, roffset); | |
170 | return cre; | |
b1f8e4f8 JH |
171 | } |
172 | ||
173 | uschar * | |
174 | m_pcre_exec(const pcre * cre, uschar * text) | |
175 | { | |
8a512ed5 JH |
176 | int ovector[10*3]; |
177 | int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0, | |
178 | ovector, nelements(ovector)); | |
179 | uschar * substr = NULL; | |
180 | if (i >= 2) /* Got it */ | |
181 | pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr); | |
182 | return substr; | |
b1f8e4f8 JH |
183 | } |
184 | ||
185 | static const pcre * | |
55414b25 JH |
186 | m_pcre_nextinlist(const uschar ** list, int * sep, |
187 | char * listerr, uschar ** errstr) | |
b1f8e4f8 | 188 | { |
8a512ed5 JH |
189 | const uschar * list_ele; |
190 | const pcre * cre = NULL; | |
191 | ||
192 | if (!(list_ele = string_nextinlist(list, sep, NULL, 0))) | |
193 | *errstr = US listerr; | |
194 | else | |
195 | cre = m_pcre_compile(CUS list_ele, errstr); | |
196 | return cre; | |
b1f8e4f8 JH |
197 | } |
198 | ||
4e71661f JH |
199 | /* |
200 | Simple though inefficient wrapper for reading a line. Drop CRs and the | |
201 | trailing newline. Can return early on buffer full. Null-terminate. | |
202 | Apply initial timeout if no data ready. | |
203 | ||
0f0c8159 JH |
204 | Return: number of chars - zero for an empty line |
205 | -1 on EOF | |
206 | -2 on timeout or error | |
4e71661f JH |
207 | */ |
208 | static int | |
209 | recv_line(int fd, uschar * buffer, int bsize, int tmo) | |
210 | { | |
211 | uschar * p = buffer; | |
212 | ssize_t rcv; | |
0f0c8159 | 213 | BOOL ok = FALSE; |
4e71661f JH |
214 | |
215 | if (!fd_ready(fd, tmo-time(NULL))) | |
0f0c8159 | 216 | return -2; |
4e71661f | 217 | |
0f0c8159 | 218 | /*XXX tmo handling assumes we always get a whole line */ |
4e71661f | 219 | /* read until \n */ |
0f0c8159 | 220 | errno = 0; |
4e71661f JH |
221 | while ((rcv = read(fd, p, 1)) > 0) |
222 | { | |
0f0c8159 | 223 | ok = TRUE; |
4e71661f JH |
224 | if (p-buffer > bsize-2) break; |
225 | if (*p == '\n') break; | |
226 | if (*p != '\r') p++; | |
227 | } | |
0f0c8159 JH |
228 | if (!ok) |
229 | { | |
230 | DEBUG(D_acl) debug_printf("Malware scan: read %s (%s)\n", | |
231 | rcv==0 ? "EOF" : "error", strerror(errno)); | |
232 | return rcv==0 ? -1 : -2; | |
233 | } | |
4e71661f JH |
234 | *p = '\0'; |
235 | ||
236 | DEBUG(D_acl) debug_printf("Malware scan: read '%s'\n", buffer); | |
237 | return p - buffer; | |
238 | } | |
239 | ||
240 | /* return TRUE iff size as requested */ | |
241 | static BOOL | |
242 | recv_len(int sock, void * buf, int size, int tmo) | |
243 | { | |
244 | return fd_ready(sock, tmo-time(NULL)) | |
245 | ? recv(sock, buf, size, 0) == size | |
246 | : FALSE; | |
247 | } | |
248 | ||
249 | ||
0f0c8159 JH |
250 | |
251 | /* ============= private routines for the "mksd" scanner type ============== */ | |
252 | ||
253 | #include <sys/uio.h> | |
254 | ||
255 | static inline int | |
256 | mksd_writev (int sock, struct iovec * iov, int iovcnt) | |
257 | { | |
258 | int i; | |
259 | ||
260 | for (;;) | |
261 | { | |
262 | do | |
263 | i = writev (sock, iov, iovcnt); | |
264 | while (i < 0 && errno == EINTR); | |
265 | if (i <= 0) | |
266 | { | |
267 | (void) malware_errlog_defer( | |
268 | US"unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
269 | return -1; | |
270 | } | |
271 | for (;;) /* check for short write */ | |
272 | if (i >= iov->iov_len) | |
273 | { | |
274 | if (--iovcnt == 0) | |
275 | return 0; | |
276 | i -= iov->iov_len; | |
277 | iov++; | |
278 | } | |
279 | else | |
280 | { | |
281 | iov->iov_len -= i; | |
282 | iov->iov_base = CS iov->iov_base + i; | |
283 | break; | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
288 | static inline int | |
289 | mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size, int tmo) | |
290 | { | |
291 | int offset = 0; | |
292 | int i; | |
293 | ||
294 | do | |
295 | { | |
296 | i = ip_recv(sock, av_buffer+offset, av_buffer_size-offset, tmo-time(NULL)); | |
297 | if (i <= 0) | |
298 | { | |
299 | (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
300 | return -1; | |
301 | } | |
302 | ||
303 | offset += i; | |
304 | /* offset == av_buffer_size -> buffer full */ | |
305 | if (offset == av_buffer_size) | |
306 | { | |
307 | (void) malware_errlog_defer(US"malformed reply received from mksd"); | |
308 | return -1; | |
309 | } | |
310 | } while (av_buffer[offset-1] != '\n'); | |
311 | ||
312 | av_buffer[offset] = '\0'; | |
313 | return offset; | |
314 | } | |
315 | ||
316 | static inline int | |
317 | mksd_parse_line(struct scan * scanent, char * line) | |
318 | { | |
319 | char *p; | |
320 | ||
321 | switch (*line) | |
322 | { | |
323 | case 'O': /* OK */ | |
324 | return OK; | |
325 | ||
326 | case 'E': | |
327 | case 'A': /* ERR */ | |
328 | if ((p = strchr (line, '\n')) != NULL) | |
329 | *p = '\0'; | |
330 | return m_errlog_defer(scanent, | |
331 | string_sprintf("scanner failed: %s", line)); | |
332 | ||
333 | default: /* VIR */ | |
334 | if ((p = strchr (line, '\n')) != NULL) | |
335 | { | |
336 | *p = '\0'; | |
337 | if ( p-line > 5 | |
338 | && line[3] == ' ' | |
339 | && (p = strchr(line+4, ' ')) != NULL | |
340 | && p-line > 4 | |
341 | ) | |
342 | { | |
343 | *p = '\0'; | |
344 | malware_name = string_copy(US line+4); | |
345 | return OK; | |
346 | } | |
347 | } | |
348 | return m_errlog_defer(scanent, | |
349 | string_sprintf("malformed reply received: %s", line)); | |
350 | } | |
351 | } | |
352 | ||
353 | static int | |
354 | mksd_scan_packed(struct scan * scanent, int sock, const uschar * scan_filename, | |
355 | int tmo) | |
356 | { | |
357 | struct iovec iov[3]; | |
358 | const char *cmd = "MSQ\n"; | |
359 | uschar av_buffer[1024]; | |
360 | ||
361 | iov[0].iov_base = (void *) cmd; | |
362 | iov[0].iov_len = 3; | |
363 | iov[1].iov_base = (void *) scan_filename; | |
364 | iov[1].iov_len = Ustrlen(scan_filename); | |
365 | iov[2].iov_base = (void *) (cmd + 3); | |
366 | iov[2].iov_len = 1; | |
367 | ||
368 | if (mksd_writev (sock, iov, 3) < 0) | |
369 | return DEFER; | |
370 | ||
371 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer), tmo) < 0) | |
372 | return DEFER; | |
373 | ||
374 | return mksd_parse_line (scanent, CS av_buffer); | |
375 | } | |
376 | ||
8a512ed5 JH |
377 | |
378 | static int | |
379 | clamd_option(clamd_address * cd, const uschar * optstr, int * subsep) | |
380 | { | |
381 | uschar * s; | |
382 | ||
383 | cd->retry = 0; | |
384 | while ((s = string_nextinlist(&optstr, subsep, NULL, 0))) | |
8a512ed5 JH |
385 | if (Ustrncmp(s, "retry=", 6) == 0) |
386 | { | |
387 | int sec = readconf_readtime((s += 6), '\0', FALSE); | |
388 | if (sec < 0) | |
389 | return FAIL; | |
390 | cd->retry = sec; | |
391 | } | |
392 | else | |
393 | return FAIL; | |
93a6fce2 | 394 | return OK; |
8a512ed5 JH |
395 | } |
396 | ||
8544e77a PP |
397 | /************************************************* |
398 | * Scan content for malware * | |
399 | *************************************************/ | |
400 | ||
401 | /* This is an internal interface for scanning an email; the normal interface | |
402 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
403 | ||
404 | Arguments: | |
0f0c8159 | 405 | malware_re match condition for "malware=" |
8544e77a | 406 | eml_filename the file holding the email to be scanned |
0f0c8159 | 407 | timeout if nonzero, non-default timeoutl |
8544e77a PP |
408 | faking whether or not we're faking this up for the -bmalware test |
409 | ||
410 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
411 | where true means malware was found (condition applies) | |
412 | */ | |
b1f8e4f8 | 413 | static int |
0f0c8159 JH |
414 | malware_internal(const uschar * malware_re, const uschar * eml_filename, |
415 | int timeout, BOOL faking) | |
b1f8e4f8 | 416 | { |
0f0c8159 | 417 | int sep = 0; |
55414b25 | 418 | const uschar *av_scanner_work = av_scanner; |
0f0c8159 | 419 | uschar *scanner_name; |
0f0c8159 JH |
420 | unsigned long mbox_size; |
421 | FILE *mbox_file; | |
422 | const pcre *re; | |
423 | uschar * errstr; | |
424 | struct scan * scanent; | |
425 | const uschar * scanner_options; | |
426 | int sock = -1; | |
427 | time_t tmo; | |
428 | ||
429 | /* make sure the eml mbox file is spooled up */ | |
430 | if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL))) | |
431 | return malware_errlog_defer(US"error while creating mbox spool file"); | |
432 | ||
433 | /* none of our current scanners need the mbox | |
434 | file as a stream, so we can close it right away */ | |
435 | (void)fclose(mbox_file); | |
436 | ||
437 | if (!malware_re) | |
438 | return FAIL; /* empty means "don't match anything" */ | |
439 | ||
440 | /* parse 1st option */ | |
441 | if ( (strcmpic(malware_re, US"false") == 0) || | |
442 | (Ustrcmp(malware_re,"0") == 0) ) | |
443 | return FAIL; /* explicitly no matching */ | |
444 | ||
445 | /* special cases (match anything except empty) */ | |
476be7e2 JH |
446 | if ( strcmpic(malware_re,US"true") == 0 |
447 | || Ustrcmp(malware_re,"*") == 0 | |
448 | || Ustrcmp(malware_re,"1") == 0 | |
449 | ) | |
450 | { | |
451 | if ( !malware_default_re | |
452 | && !(malware_default_re = m_pcre_compile(malware_regex_default, &errstr))) | |
453 | return malware_errlog_defer(errstr); | |
0f0c8159 | 454 | malware_re = malware_regex_default; |
476be7e2 JH |
455 | re = malware_default_re; |
456 | } | |
0f0c8159 JH |
457 | |
458 | /* compile the regex, see if it works */ | |
476be7e2 | 459 | else if (!(re = m_pcre_compile(malware_re, &errstr))) |
0f0c8159 JH |
460 | return malware_errlog_defer(errstr); |
461 | ||
476be7e2 JH |
462 | /* Reset sep that is set by previous string_nextinlist() call */ |
463 | sep = 0; | |
464 | ||
0f0c8159 JH |
465 | /* if av_scanner starts with a dollar, expand it first */ |
466 | if (*av_scanner == '$') | |
467 | { | |
468 | if (!(av_scanner_work = expand_string(av_scanner))) | |
469 | return malware_errlog_defer( | |
470 | string_sprintf("av_scanner starts with $, but expansion failed: %s", | |
471 | expand_string_message)); | |
b1f8e4f8 | 472 | |
0f0c8159 | 473 | DEBUG(D_acl) |
b1f8e4f8 | 474 | debug_printf("Expanded av_scanner global: %s\n", av_scanner_work); |
0f0c8159 JH |
475 | /* disable result caching in this case */ |
476 | malware_name = NULL; | |
477 | malware_ok = FALSE; | |
8523533c TK |
478 | } |
479 | ||
0f0c8159 JH |
480 | /* Do not scan twice (unless av_scanner is dynamic). */ |
481 | if (!malware_ok) | |
482 | { | |
483 | /* find the scanner type from the av_scanner option */ | |
484 | if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
485 | return malware_errlog_defer(US"av_scanner configuration variable is empty"); | |
486 | if (!timeout) timeout = MALWARE_TIMEOUT; | |
487 | tmo = time(NULL) + timeout; | |
488 | ||
3e60dd41 JH |
489 | for (scanent = m_scans; ; scanent++) |
490 | { | |
0f0c8159 JH |
491 | if (!scanent->name) |
492 | return malware_errlog_defer(string_sprintf("unknown scanner type '%s'", | |
493 | scanner_name)); | |
494 | if (strcmpic(scanner_name, US scanent->name) != 0) | |
495 | continue; | |
496 | if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
497 | scanner_options = scanent->options_default; | |
498 | if (scanent->conn == MC_NONE) | |
b1f8e4f8 | 499 | break; |
0f0c8159 JH |
500 | switch(scanent->conn) |
501 | { | |
3e60dd41 JH |
502 | case MC_TCP: sock = ip_tcpsocket(scanner_options, &errstr, 5); break; |
503 | case MC_UNIX: sock = ip_unixsocket(scanner_options, &errstr); break; | |
504 | case MC_STRM: sock = ip_streamsocket(scanner_options, &errstr, 5); break; | |
0f0c8159 | 505 | default: /* compiler quietening */ break; |
384152a6 | 506 | } |
0f0c8159 JH |
507 | if (sock < 0) |
508 | return m_errlog_defer(scanent, errstr); | |
509 | break; | |
510 | } | |
511 | DEBUG(D_acl) debug_printf("Malware scan: %s tmo %s\n", scanner_name, readconf_printtime(timeout)); | |
8e669ac1 | 512 | |
0f0c8159 JH |
513 | switch (scanent->scancode) |
514 | { | |
515 | case M_FPROTD: /* "f-protd" scanner type -------------------------------- */ | |
b1f8e4f8 | 516 | { |
0f0c8159 JH |
517 | uschar *fp_scan_option; |
518 | unsigned int detected=0, par_count=0; | |
519 | uschar * scanrequest; | |
520 | uschar buf[32768], *strhelper, *strhelper2; | |
521 | uschar * malware_name_internal = NULL; | |
522 | int len; | |
b1f8e4f8 | 523 | |
0f0c8159 | 524 | scanrequest = string_sprintf("GET %s", eml_filename); |
b1f8e4f8 | 525 | |
0f0c8159 JH |
526 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, |
527 | NULL, 0))) | |
528 | { | |
529 | scanrequest = string_sprintf("%s%s%s", scanrequest, | |
530 | par_count ? "%20" : "?", fp_scan_option); | |
531 | par_count++; | |
532 | } | |
533 | scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest); | |
534 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s: %s\n", | |
535 | scanner_name, scanrequest); | |
b1f8e4f8 | 536 | |
0f0c8159 JH |
537 | /* send scan request */ |
538 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
539 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 540 | |
0f0c8159 JH |
541 | while ((len = recv_line(sock, buf, sizeof(buf), tmo)) >= 0) |
542 | if (len > 0) | |
543 | { | |
544 | if (Ustrstr(buf, US"<detected type=\"") != NULL) | |
545 | detected = 1; | |
546 | else if (detected && (strhelper = Ustrstr(buf, US"<name>"))) | |
4e71661f | 547 | { |
0f0c8159 | 548 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) |
4e71661f | 549 | { |
0f0c8159 JH |
550 | *strhelper2 = '\0'; |
551 | malware_name_internal = string_copy(strhelper+6); | |
4e71661f JH |
552 | } |
553 | } | |
0f0c8159 | 554 | else if (Ustrstr(buf, US"<summary code=\"")) |
4e71661f | 555 | { |
0f0c8159 JH |
556 | malware_name = Ustrstr(buf, US"<summary code=\"11\">") |
557 | ? malware_name_internal : NULL; | |
558 | break; | |
4e71661f | 559 | } |
0f0c8159 JH |
560 | } |
561 | if (len < -1) | |
562 | { | |
563 | (void)close(sock); | |
564 | return DEFER; | |
565 | } | |
566 | break; | |
567 | } /* f-protd */ | |
b1f8e4f8 | 568 | |
0f0c8159 JH |
569 | case M_DRWEB: /* "drweb" scanner type ----------------------------------- */ |
570 | /* v0.1 - added support for tcp sockets */ | |
571 | /* v0.0 - initial release -- support for unix sockets */ | |
572 | { | |
573 | int result; | |
574 | off_t fsize; | |
575 | unsigned int fsize_uint; | |
576 | uschar * tmpbuf, *drweb_fbuf; | |
577 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
578 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
0f0c8159 JH |
579 | |
580 | /* prepare variables */ | |
581 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
582 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
583 | ||
584 | if (*scanner_options != '/') | |
585 | { | |
586 | /* calc file size */ | |
587 | if ((drweb_fd = open(CCS eml_filename, O_RDONLY)) == -1) | |
588 | return m_errlog_defer_3(scanent, | |
589 | string_sprintf("can't open spool file %s: %s", | |
590 | eml_filename, strerror(errno)), | |
591 | sock); | |
b1f8e4f8 | 592 | |
0f0c8159 JH |
593 | if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) |
594 | { | |
595 | int err = errno; | |
b1f8e4f8 | 596 | (void)close(drweb_fd); |
0f0c8159 JH |
597 | return m_errlog_defer_3(scanent, |
598 | string_sprintf("can't seek spool file %s: %s", | |
599 | eml_filename, strerror(err)), | |
600 | sock); | |
601 | } | |
602 | fsize_uint = (unsigned int) fsize; | |
603 | if ((off_t)fsize_uint != fsize) | |
604 | { | |
b1f8e4f8 | 605 | (void)close(drweb_fd); |
0f0c8159 JH |
606 | return m_errlog_defer_3(scanent, |
607 | string_sprintf("seeking spool file %s, size overflow", | |
608 | eml_filename), | |
609 | sock); | |
4e71661f | 610 | } |
0f0c8159 JH |
611 | drweb_slen = htonl(fsize); |
612 | lseek(drweb_fd, 0, SEEK_SET); | |
613 | ||
614 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n", | |
615 | scanner_name, scanner_options); | |
616 | ||
617 | /* send scan request */ | |
618 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
619 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
620 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
621 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) | |
4e71661f | 622 | { |
0f0c8159 JH |
623 | (void)close(drweb_fd); |
624 | return m_errlog_defer_3(scanent, string_sprintf( | |
625 | "unable to send commands to socket (%s)", scanner_options), | |
626 | sock); | |
4e71661f | 627 | } |
8e669ac1 | 628 | |
0f0c8159 JH |
629 | if (!(drweb_fbuf = (uschar *) malloc (fsize_uint))) |
630 | { | |
631 | (void)close(drweb_fd); | |
b1f8e4f8 | 632 | return m_errlog_defer_3(scanent, |
0f0c8159 JH |
633 | string_sprintf("unable to allocate memory %u for file (%s)", |
634 | fsize_uint, eml_filename), | |
635 | sock); | |
636 | } | |
b1f8e4f8 | 637 | |
0f0c8159 JH |
638 | if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) |
639 | { | |
640 | int err = errno; | |
641 | (void)close(drweb_fd); | |
642 | free(drweb_fbuf); | |
b1f8e4f8 | 643 | return m_errlog_defer_3(scanent, |
0f0c8159 JH |
644 | string_sprintf("can't read spool file %s: %s", |
645 | eml_filename, strerror(err)), | |
646 | sock); | |
647 | } | |
648 | (void)close(drweb_fd); | |
b1f8e4f8 | 649 | |
0f0c8159 JH |
650 | /* send file body to socket */ |
651 | if (send(sock, drweb_fbuf, fsize, 0) < 0) | |
4e71661f | 652 | { |
0f0c8159 JH |
653 | free(drweb_fbuf); |
654 | return m_errlog_defer_3(scanent, string_sprintf( | |
655 | "unable to send file body to socket (%s)", scanner_options), | |
656 | sock); | |
657 | } | |
658 | (void)close(drweb_fd); | |
659 | } | |
660 | else | |
661 | { | |
662 | drweb_slen = htonl(Ustrlen(eml_filename)); | |
b1f8e4f8 | 663 | |
0f0c8159 JH |
664 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n", |
665 | scanner_name, scanner_options); | |
b1f8e4f8 | 666 | |
0f0c8159 JH |
667 | /* send scan request */ |
668 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
669 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
670 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
671 | (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || | |
672 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) | |
673 | return m_errlog_defer_3(scanent, string_sprintf( | |
674 | "unable to send commands to socket (%s)", scanner_options), | |
675 | sock); | |
676 | } | |
b1f8e4f8 | 677 | |
0f0c8159 JH |
678 | /* wait for result */ |
679 | if (!recv_len(sock, &drweb_rc, sizeof(drweb_rc), tmo)) | |
680 | return m_errlog_defer_3(scanent, | |
681 | US"unable to read return code", sock); | |
682 | drweb_rc = ntohl(drweb_rc); | |
683 | ||
684 | if (!recv_len(sock, &drweb_vnum, sizeof(drweb_vnum), tmo)) | |
685 | return m_errlog_defer_3(scanent, | |
686 | US"unable to read the number of viruses", sock); | |
687 | drweb_vnum = ntohl(drweb_vnum); | |
688 | ||
689 | /* "virus(es) found" if virus number is > 0 */ | |
690 | if (drweb_vnum) | |
691 | { | |
692 | int i; | |
b1f8e4f8 | 693 | |
0f0c8159 JH |
694 | /* setup default virus name */ |
695 | malware_name = US"unknown"; | |
b1f8e4f8 | 696 | |
0f0c8159 | 697 | /* set up match regex */ |
476be7e2 JH |
698 | if (!drweb_re) |
699 | drweb_re = m_pcre_compile(drweb_re_str, &errstr); | |
b1f8e4f8 | 700 | |
0f0c8159 JH |
701 | /* read and concatenate virus names into one string */ |
702 | for (i = 0; i < drweb_vnum; i++) | |
4e71661f | 703 | { |
0f0c8159 JH |
704 | int size = 0, off = 0, ovector[10*3]; |
705 | /* read the size of report */ | |
706 | if (!recv_len(sock, &drweb_slen, sizeof(drweb_slen), tmo)) | |
b1f8e4f8 | 707 | return m_errlog_defer_3(scanent, |
0f0c8159 JH |
708 | US"cannot read report size", sock); |
709 | drweb_slen = ntohl(drweb_slen); | |
710 | tmpbuf = store_get(drweb_slen); | |
b1f8e4f8 | 711 | |
0f0c8159 JH |
712 | /* read report body */ |
713 | if (!recv_len(sock, tmpbuf, drweb_slen, tmo)) | |
714 | return m_errlog_defer_3(scanent, | |
715 | US"cannot read report string", sock); | |
716 | tmpbuf[drweb_slen] = '\0'; | |
8544e77a | 717 | |
0f0c8159 JH |
718 | /* try matcher on the line, grab substring */ |
719 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, | |
720 | ovector, nelements(ovector)); | |
721 | if (result >= 2) | |
722 | { | |
723 | const char * pre_malware_nb; | |
8e669ac1 | 724 | |
0f0c8159 | 725 | pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb); |
8e669ac1 | 726 | |
0f0c8159 JH |
727 | if (i==0) /* the first name we just copy to malware_name */ |
728 | malware_name = string_append(NULL, &size, &off, | |
729 | 1, pre_malware_nb); | |
8e669ac1 | 730 | |
0f0c8159 JH |
731 | else /* concatenate each new virus name to previous */ |
732 | malware_name = string_append(malware_name, &size, &off, | |
733 | 2, "/", pre_malware_nb); | |
8e669ac1 | 734 | |
0f0c8159 JH |
735 | pcre_free_substring(pre_malware_nb); |
736 | } | |
737 | } | |
738 | } | |
739 | else | |
740 | { | |
741 | const char *drweb_s = NULL; | |
742 | ||
743 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
744 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
745 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
746 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
747 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
748 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
749 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
750 | * and others are ignored */ | |
751 | if (drweb_s) | |
752 | return m_errlog_defer_3(scanent, | |
753 | string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s), | |
754 | sock); | |
8e669ac1 | 755 | |
0f0c8159 | 756 | /* no virus found */ |
b1f8e4f8 | 757 | malware_name = NULL; |
0f0c8159 JH |
758 | } |
759 | break; | |
760 | } /* drweb */ | |
8e669ac1 | 761 | |
0f0c8159 JH |
762 | case M_AVES: /* "aveserver" scanner type -------------------------------- */ |
763 | { | |
764 | uschar buf[32768]; | |
765 | int result; | |
8544e77a | 766 | |
0f0c8159 JH |
767 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
768 | buf[0] = 0; | |
769 | recv_line(sock, buf, sizeof(buf), tmo); | |
8544e77a | 770 | |
0f0c8159 JH |
771 | if (buf[0] != '2') /* aveserver is having problems */ |
772 | return m_errlog_defer_3(scanent, | |
773 | string_sprintf("unavailable (Responded: %s).", | |
b1f8e4f8 | 774 | ((buf[0] != 0) ? buf : (uschar *)"nothing") ), |
0f0c8159 | 775 | sock); |
8e669ac1 | 776 | |
0f0c8159 JH |
777 | /* prepare our command */ |
778 | (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n", | |
779 | eml_filename); | |
780 | ||
781 | /* and send it */ | |
782 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s %s\n", | |
783 | scanner_name, buf); | |
784 | if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0) | |
785 | return m_errlog_defer(scanent, errstr); | |
786 | ||
787 | malware_name = NULL; | |
788 | result = 0; | |
789 | /* read response lines, find malware name and final response */ | |
790 | while (recv_line(sock, buf, sizeof(buf), tmo) > 0) | |
791 | { | |
792 | if (buf[0] == '2') | |
793 | break; | |
794 | if (buf[0] == '5') /* aveserver is having problems */ | |
4e71661f | 795 | { |
0f0c8159 JH |
796 | result = m_errlog_defer(scanent, |
797 | string_sprintf("unable to scan file %s (Responded: %s).", | |
798 | eml_filename, buf)); | |
799 | break; | |
4e71661f | 800 | } |
0f0c8159 JH |
801 | if (Ustrncmp(buf,"322",3) == 0) |
802 | { | |
803 | uschar *p = Ustrchr(&buf[4], ' '); | |
804 | *p = '\0'; | |
805 | malware_name = string_copy(&buf[4]); | |
806 | } | |
807 | } | |
808 | ||
809 | if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0) | |
810 | return m_errlog_defer(scanent, errstr); | |
811 | ||
812 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ | |
813 | buf[0] = 0; | |
814 | recv_line(sock, buf, sizeof(buf), tmo); | |
815 | ||
816 | if (buf[0] != '2') /* aveserver is having problems */ | |
817 | return m_errlog_defer_3(scanent, | |
818 | string_sprintf("unable to quit dialogue (Responded: %s).", | |
819 | ((buf[0] != 0) ? buf : (uschar *)"nothing") ), | |
820 | sock); | |
821 | ||
822 | if (result == DEFER) | |
823 | { | |
824 | (void)close(sock); | |
825 | return DEFER; | |
826 | } | |
827 | break; | |
b1f8e4f8 | 828 | } /* aveserver */ |
8e669ac1 | 829 | |
b1f8e4f8 JH |
830 | case M_FSEC: /* "fsecure" scanner type ---------------------------------- */ |
831 | { | |
0f0c8159 JH |
832 | int i, j, bread = 0; |
833 | uschar * file_name; | |
834 | uschar av_buffer[1024]; | |
0f0c8159 JH |
835 | static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n", |
836 | US"CONFIGURE\tTIMEOUT\t0\n", | |
837 | US"CONFIGURE\tMAXARCH\t5\n", | |
838 | US"CONFIGURE\tMIME\t1\n" }; | |
839 | ||
840 | malware_name = NULL; | |
841 | ||
842 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
843 | scanner_name, scanner_options); | |
844 | /* pass options */ | |
845 | memset(av_buffer, 0, sizeof(av_buffer)); | |
846 | for (i = 0; i != nelements(cmdopt); i++) | |
847 | { | |
b1f8e4f8 | 848 | |
0f0c8159 JH |
849 | if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0) |
850 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 851 | |
0f0c8159 JH |
852 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); |
853 | if (bread > 0) av_buffer[bread]='\0'; | |
854 | if (bread < 0) | |
855 | return m_errlog_defer_3(scanent, | |
856 | string_sprintf("unable to read answer %d (%s)", i, strerror(errno)), | |
857 | sock); | |
858 | for (j = 0; j < bread; j++) | |
859 | if (av_buffer[j] == '\r' || av_buffer[j] == '\n') | |
860 | av_buffer[j] ='@'; | |
861 | } | |
8e669ac1 | 862 | |
0f0c8159 JH |
863 | /* pass the mailfile to fsecure */ |
864 | file_name = string_sprintf("SCAN\t%s\n", eml_filename); | |
b1f8e4f8 | 865 | |
0f0c8159 JH |
866 | if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0) |
867 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 868 | |
0f0c8159 JH |
869 | /* set up match */ |
870 | /* todo also SUSPICION\t */ | |
476be7e2 JH |
871 | if (!fsec_re) |
872 | fsec_re = m_pcre_compile(fsec_re_str, &errstr); | |
b1f8e4f8 | 873 | |
0f0c8159 JH |
874 | /* read report, linewise. Apply a timeout as the Fsecure daemon |
875 | sometimes wants an answer to "PING" but they won't tell us what */ | |
fd02dc0e | 876 | { |
0f0c8159 JH |
877 | uschar * p = av_buffer; |
878 | uschar * q; | |
fd02dc0e | 879 | |
0f0c8159 JH |
880 | for (;;) |
881 | { | |
80591636 | 882 | errno = ETIMEDOUT; |
0f0c8159 JH |
883 | i = av_buffer+sizeof(av_buffer)-p; |
884 | if ((bread= ip_recv(sock, p, i-1, tmo-time(NULL))) < 0) | |
885 | return m_errlog_defer_3(scanent, | |
886 | string_sprintf("unable to read result (%s)", strerror(errno)), | |
887 | sock); | |
b1f8e4f8 | 888 | |
755762fd | 889 | for (p[bread] = '\0'; (q = Ustrchr(p, '\n')); p = q+1) |
0f0c8159 JH |
890 | { |
891 | *q = '\0'; | |
fd02dc0e | 892 | |
0f0c8159 JH |
893 | /* Really search for virus again? */ |
894 | if (!malware_name) | |
895 | /* try matcher on the line, grab substring */ | |
476be7e2 | 896 | malware_name = m_pcre_exec(fsec_re, p); |
fd02dc0e | 897 | |
0f0c8159 JH |
898 | if (Ustrstr(p, "OK\tScan ok.")) |
899 | goto fsec_found; | |
900 | } | |
fd02dc0e | 901 | |
0f0c8159 JH |
902 | /* copy down the trailing partial line then read another chunk */ |
903 | i = av_buffer+sizeof(av_buffer)-p; | |
904 | memmove(av_buffer, p, i); | |
905 | p = av_buffer+i; | |
fd02dc0e | 906 | } |
b1f8e4f8 | 907 | } |
fd02dc0e JH |
908 | |
909 | fsec_found: | |
b1f8e4f8 JH |
910 | break; |
911 | } /* fsecure */ | |
599dcb77 | 912 | |
b1f8e4f8 JH |
913 | case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */ |
914 | { | |
0f0c8159 JH |
915 | time_t t; |
916 | uschar tmpbuf[1024]; | |
917 | uschar * scanrequest; | |
918 | int kav_rc; | |
919 | unsigned long kav_reportlen, bread; | |
920 | const pcre *kav_re; | |
921 | uschar *p; | |
922 | ||
923 | /* get current date and time, build scan request */ | |
924 | time(&t); | |
925 | /* pdp note: before the eml_filename parameter, this scanned the | |
926 | directory; not finding documentation, so we'll strip off the directory. | |
927 | The side-effect is that the test framework scanning may end up in | |
928 | scanning more than was requested, but for the normal interface, this is | |
929 | fine. */ | |
930 | ||
931 | strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t)); | |
932 | scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename); | |
933 | p = Ustrrchr(scanrequest, '/'); | |
934 | if (p) | |
935 | *p = '\0'; | |
936 | ||
937 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
938 | scanner_name, scanner_options); | |
939 | ||
940 | /* send scan request */ | |
941 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
942 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 943 | |
0f0c8159 JH |
944 | /* wait for result */ |
945 | if (!recv_len(sock, tmpbuf, 2, tmo)) | |
946 | return m_errlog_defer_3(scanent, | |
947 | US"unable to read 2 bytes from socket.", sock); | |
b1f8e4f8 | 948 | |
0f0c8159 JH |
949 | /* get errorcode from one nibble */ |
950 | kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F; | |
951 | switch(kav_rc) | |
952 | { | |
953 | case 5: case 6: /* improper kavdaemon configuration */ | |
954 | return m_errlog_defer_3(scanent, | |
955 | US"please reconfigure kavdaemon to NOT disinfect or remove infected files.", | |
956 | sock); | |
957 | case 1: | |
958 | return m_errlog_defer_3(scanent, | |
959 | US"reported 'scanning not completed' (code 1).", sock); | |
960 | case 7: | |
961 | return m_errlog_defer_3(scanent, | |
962 | US"reported 'kavdaemon damaged' (code 7).", sock); | |
963 | } | |
b1f8e4f8 | 964 | |
0f0c8159 JH |
965 | /* code 8 is not handled, since it is ambigous. It appears mostly on |
966 | bounces where part of a file has been cut off */ | |
b1f8e4f8 | 967 | |
0f0c8159 JH |
968 | /* "virus found" return codes (2-4) */ |
969 | if (kav_rc > 1 && kav_rc < 5) | |
b1f8e4f8 | 970 | { |
0f0c8159 | 971 | int report_flag = 0; |
599dcb77 | 972 | |
0f0c8159 JH |
973 | /* setup default virus name */ |
974 | malware_name = US"unknown"; | |
b1f8e4f8 | 975 | |
0f0c8159 | 976 | report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ]; |
b1f8e4f8 | 977 | |
0f0c8159 JH |
978 | /* read the report, if available */ |
979 | if (report_flag == 1) | |
980 | { | |
981 | /* read report size */ | |
982 | if (!recv_len(sock, &kav_reportlen, 4, tmo)) | |
983 | return m_errlog_defer_3(scanent, | |
984 | US"cannot read report size", sock); | |
b1f8e4f8 | 985 | |
0f0c8159 JH |
986 | /* it's possible that avp returns av_buffer[1] == 1 but the |
987 | reportsize is 0 (!?) */ | |
988 | if (kav_reportlen > 0) | |
4e71661f | 989 | { |
0f0c8159 | 990 | /* set up match regex, depends on retcode */ |
476be7e2 JH |
991 | if (kav_rc == 3) |
992 | { | |
993 | if (!kav_re_sus) kav_re_sus = m_pcre_compile(kav_re_sus_str, &errstr); | |
994 | kav_re = kav_re_sus; | |
995 | } | |
996 | else | |
997 | { | |
998 | if (!kav_re_inf) kav_re_inf = m_pcre_compile(kav_re_inf_str, &errstr); | |
999 | kav_re = kav_re_inf; | |
1000 | } | |
0f0c8159 JH |
1001 | |
1002 | /* read report, linewise */ | |
1003 | while (kav_reportlen > 0) | |
4e71661f | 1004 | { |
0f0c8159 JH |
1005 | if ((bread = recv_line(sock, tmpbuf, sizeof(tmpbuf), tmo)) < 0) |
1006 | break; | |
1007 | kav_reportlen -= bread+1; | |
1008 | ||
1009 | /* try matcher on the line, grab substring */ | |
1010 | if ((malware_name = m_pcre_exec(kav_re, tmpbuf))) | |
1011 | break; | |
b1f8e4f8 JH |
1012 | } |
1013 | } | |
1014 | } | |
0f0c8159 JH |
1015 | } |
1016 | else /* no virus found */ | |
1017 | malware_name = NULL; | |
599dcb77 | 1018 | |
0f0c8159 | 1019 | break; |
599dcb77 | 1020 | } |
8544e77a | 1021 | |
b1f8e4f8 JH |
1022 | case M_CMDL: /* "cmdline" scanner type ---------------------------------- */ |
1023 | { | |
0f0c8159 JH |
1024 | const uschar *cmdline_scanner = scanner_options; |
1025 | const pcre *cmdline_trigger_re; | |
1026 | const pcre *cmdline_regex_re; | |
1027 | uschar * file_name; | |
1028 | uschar * commandline; | |
1029 | void (*eximsigchld)(int); | |
1030 | void (*eximsigpipe)(int); | |
1031 | FILE *scanner_out = NULL; | |
1032 | int scanner_fd; | |
1033 | FILE *scanner_record = NULL; | |
1034 | uschar linebuffer[32767]; | |
1035 | int rcnt; | |
1036 | int trigger = 0; | |
1037 | uschar *p; | |
1038 | ||
1039 | if (!cmdline_scanner) | |
1040 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 1041 | |
0f0c8159 JH |
1042 | /* find scanner output trigger */ |
1043 | cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1044 | "missing trigger specification", &errstr); | |
1045 | if (!cmdline_trigger_re) | |
1046 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 1047 | |
0f0c8159 JH |
1048 | /* find scanner name regex */ |
1049 | cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1050 | "missing virus name regex specification", &errstr); | |
1051 | if (!cmdline_regex_re) | |
1052 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 1053 | |
0f0c8159 JH |
1054 | /* prepare scanner call; despite the naming, file_name holds a directory |
1055 | name which is documented as the value given to %s. */ | |
b1f8e4f8 | 1056 | |
0f0c8159 JH |
1057 | file_name = string_copy(eml_filename); |
1058 | p = Ustrrchr(file_name, '/'); | |
1059 | if (p) | |
1060 | *p = '\0'; | |
1061 | commandline = string_sprintf(CS cmdline_scanner, file_name); | |
b1f8e4f8 | 1062 | |
0f0c8159 JH |
1063 | /* redirect STDERR too */ |
1064 | commandline = string_sprintf("%s 2>&1", commandline); | |
b1f8e4f8 | 1065 | |
0f0c8159 JH |
1066 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
1067 | scanner_name, commandline); | |
b1f8e4f8 | 1068 | |
0f0c8159 JH |
1069 | /* store exims signal handlers */ |
1070 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1071 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
b1f8e4f8 | 1072 | |
0f0c8159 JH |
1073 | if (!(scanner_out = popen(CS commandline,"r"))) |
1074 | { | |
1075 | int err = errno; | |
1076 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1077 | return m_errlog_defer(scanent, | |
1078 | string_sprintf("call (%s) failed: %s.", commandline, strerror(err))); | |
1079 | } | |
1080 | scanner_fd = fileno(scanner_out); | |
94a18f28 | 1081 | |
0f0c8159 JH |
1082 | file_name = string_sprintf("%s/scan/%s/%s_scanner_output", |
1083 | spool_directory, message_id, message_id); | |
b1f8e4f8 | 1084 | |
0f0c8159 JH |
1085 | if (!(scanner_record = modefopen(file_name, "wb", SPOOL_MODE))) |
1086 | { | |
1087 | int err = errno; | |
1088 | (void) pclose(scanner_out); | |
1089 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1090 | return m_errlog_defer(scanent, string_sprintf( | |
1091 | "opening scanner output file (%s) failed: %s.", | |
1092 | file_name, strerror(err))); | |
1093 | } | |
8e669ac1 | 1094 | |
0f0c8159 JH |
1095 | /* look for trigger while recording output */ |
1096 | while ((rcnt = recv_line(scanner_fd, linebuffer, | |
1097 | sizeof(linebuffer), tmo))) | |
1098 | { | |
1099 | if (rcnt < 0) | |
93a6fce2 JH |
1100 | { |
1101 | int err = errno; | |
0f0c8159 JH |
1102 | if (rcnt == -1) |
1103 | break; | |
93a6fce2 JH |
1104 | (void) pclose(scanner_out); |
1105 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1106 | return m_errlog_defer(scanent, string_sprintf( | |
1107 | "unable to read from scanner (%s): %s", | |
1108 | commandline, strerror(err))); | |
1109 | } | |
4e71661f | 1110 | |
0f0c8159 JH |
1111 | if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record)) |
1112 | { | |
1113 | /* short write */ | |
1114 | (void) pclose(scanner_out); | |
1115 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1116 | return m_errlog_defer(scanent, string_sprintf( | |
1117 | "short write on scanner output file (%s).", file_name)); | |
4e71661f | 1118 | } |
0f0c8159 JH |
1119 | putc('\n', scanner_record); |
1120 | /* try trigger match */ | |
1121 | if ( !trigger | |
1122 | && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1) | |
1123 | ) | |
1124 | trigger = 1; | |
1125 | } | |
8e669ac1 | 1126 | |
0f0c8159 JH |
1127 | (void)fclose(scanner_record); |
1128 | sep = pclose(scanner_out); | |
1129 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1130 | if (sep != 0) | |
1131 | return m_errlog_defer(scanent, | |
1132 | sep == -1 | |
1133 | ? string_sprintf("running scanner failed: %s", strerror(sep)) | |
1134 | : string_sprintf("scanner returned error code: %d", sep)); | |
b1f8e4f8 | 1135 | |
0f0c8159 JH |
1136 | if (trigger) |
1137 | { | |
1138 | uschar * s; | |
1139 | /* setup default virus name */ | |
1140 | malware_name = US"unknown"; | |
b1f8e4f8 | 1141 | |
0f0c8159 JH |
1142 | /* re-open the scanner output file, look for name match */ |
1143 | scanner_record = fopen(CS file_name, "rb"); | |
1144 | while (fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) | |
1145 | { | |
1146 | /* try match */ | |
1147 | if ((s = m_pcre_exec(cmdline_regex_re, linebuffer))) | |
1148 | malware_name = s; | |
4e71661f | 1149 | } |
0f0c8159 JH |
1150 | (void)fclose(scanner_record); |
1151 | } | |
1152 | else /* no virus found */ | |
1153 | malware_name = NULL; | |
1154 | break; | |
b1f8e4f8 | 1155 | } /* cmdline */ |
599dcb77 | 1156 | |
b1f8e4f8 JH |
1157 | case M_SOPHIE: /* "sophie" scanner type --------------------------------- */ |
1158 | { | |
0f0c8159 JH |
1159 | int bread = 0; |
1160 | uschar *p; | |
1161 | uschar * file_name; | |
1162 | uschar av_buffer[1024]; | |
b1f8e4f8 | 1163 | |
0f0c8159 JH |
1164 | /* pass the scan directory to sophie */ |
1165 | file_name = string_copy(eml_filename); | |
1166 | if ((p = Ustrrchr(file_name, '/'))) | |
1167 | *p = '\0'; | |
b1f8e4f8 | 1168 | |
0f0c8159 JH |
1169 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
1170 | scanner_name, scanner_options); | |
b1f8e4f8 | 1171 | |
0f0c8159 JH |
1172 | if ( write(sock, file_name, Ustrlen(file_name)) < 0 |
1173 | || write(sock, "\n", 1) != 1 | |
1174 | ) | |
1175 | return m_errlog_defer_3(scanent, | |
1176 | string_sprintf("unable to write to UNIX socket (%s)", scanner_options), | |
1177 | sock); | |
b1f8e4f8 | 1178 | |
0f0c8159 JH |
1179 | /* wait for result */ |
1180 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1181 | if ((bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL))) <= 0) | |
1182 | return m_errlog_defer_3(scanent, | |
1183 | string_sprintf("unable to read from UNIX socket (%s)", scanner_options), | |
1184 | sock); | |
1185 | ||
1186 | /* infected ? */ | |
1187 | if (av_buffer[0] == '1') { | |
1188 | uschar * s = Ustrchr(av_buffer, '\n'); | |
1189 | if (s) | |
1190 | *s = '\0'; | |
1191 | malware_name = string_copy(&av_buffer[2]); | |
1192 | } | |
1193 | else if (!strncmp(CS av_buffer, "-1", 2)) | |
1194 | return m_errlog_defer_3(scanent, US"scanner reported error", sock); | |
1195 | else /* all ok, no virus */ | |
1196 | malware_name = NULL; | |
599dcb77 | 1197 | |
0f0c8159 | 1198 | break; |
8544e77a | 1199 | } |
8e669ac1 | 1200 | |
b1f8e4f8 JH |
1201 | case M_CLAMD: /* "clamd" scanner type ----------------------------------- */ |
1202 | { | |
0f0c8159 JH |
1203 | /* This code was originally contributed by David Saez */ |
1204 | /* There are three scanning methods available to us: | |
1205 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1206 | * (2) Use the STREAM command, send the data on a separate port | |
1207 | * (3) Use the zINSTREAM command, send the data inline | |
1208 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1209 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1210 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
1211 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless | |
1212 | * WITH_OLD_CLAMAV_STREAM is defined. | |
1213 | * See Exim bug 926 for details. */ | |
1214 | ||
80591636 | 1215 | uschar *p, *vname, *result_tag; |
0f0c8159 JH |
1216 | int bread=0; |
1217 | uschar * file_name; | |
1218 | uschar av_buffer[1024]; | |
1219 | uschar *hostname = US""; | |
1220 | host_item connhost; | |
1221 | uschar *clamav_fbuf; | |
1222 | int clam_fd, result; | |
1223 | off_t fsize; | |
1224 | unsigned int fsize_uint; | |
1225 | BOOL use_scan_command = FALSE; | |
8a512ed5 | 1226 | clamd_address * cv[MAX_CLAMD_SERVERS]; |
0f0c8159 JH |
1227 | int num_servers = 0; |
1228 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1229 | unsigned int port; | |
1230 | uschar av_buffer2[1024]; | |
1231 | int sockData; | |
1232 | #else | |
1233 | uint32_t send_size, send_final_zeroblock; | |
1234 | #endif | |
1235 | ||
8a512ed5 JH |
1236 | /*XXX if unixdomain socket, only one server supported. Needs fixing; |
1237 | there's no reason we should not mix local and remote servers */ | |
1238 | ||
0f0c8159 | 1239 | if (*scanner_options == '/') |
8a512ed5 JH |
1240 | { |
1241 | clamd_address * cd; | |
1242 | const uschar * sublist; | |
1243 | int subsep = ' '; | |
1244 | ||
0f0c8159 JH |
1245 | /* Local file; so we def want to use_scan_command and don't want to try |
1246 | * passing IP/port combinations */ | |
1247 | use_scan_command = TRUE; | |
8a512ed5 JH |
1248 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
1249 | ||
1250 | /* extract socket-path part */ | |
1251 | sublist = scanner_options; | |
1252 | cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0); | |
1253 | ||
1254 | /* parse options */ | |
1255 | if (clamd_option(cd, sublist, &subsep) != OK) | |
1256 | return m_errlog_defer(scanent, | |
1257 | string_sprintf("bad option '%s'", scanner_options)); | |
1258 | cv[0] = cd; | |
1259 | } | |
0f0c8159 JH |
1260 | else |
1261 | { | |
0f0c8159 JH |
1262 | /* Go through the rest of the list of host/port and construct an array |
1263 | * of servers to try. The first one is the bit we just passed from | |
1264 | * scanner_options so process that first and then scan the remainder of | |
1265 | * the address buffer */ | |
1266 | do | |
4e71661f | 1267 | { |
8a512ed5 JH |
1268 | clamd_address * cd; |
1269 | const uschar * sublist; | |
1270 | int subsep = ' '; | |
1271 | uschar * s; | |
b1f8e4f8 | 1272 | |
0f0c8159 JH |
1273 | /* The 'local' option means use the SCAN command over the network |
1274 | * socket (ie common file storage in use) */ | |
8a512ed5 JH |
1275 | /*XXX we could accept this also as a local option? */ |
1276 | if (strcmpic(scanner_options, US"local") == 0) | |
0f0c8159 JH |
1277 | { |
1278 | use_scan_command = TRUE; | |
1279 | continue; | |
1280 | } | |
b1f8e4f8 | 1281 | |
8a512ed5 | 1282 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
b1f8e4f8 | 1283 | |
0f0c8159 | 1284 | /* extract host and port part */ |
8a512ed5 JH |
1285 | sublist = scanner_options; |
1286 | if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
1287 | { | |
1288 | (void) m_errlog_defer(scanent, | |
1289 | string_sprintf("missing address: '%s'", scanner_options)); | |
1290 | continue; | |
1291 | } | |
1292 | if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
0f0c8159 JH |
1293 | { |
1294 | (void) m_errlog_defer(scanent, | |
8a512ed5 JH |
1295 | string_sprintf("missing port: '%s'", scanner_options)); |
1296 | continue; | |
1297 | } | |
93a6fce2 | 1298 | cd->tcp_port = atoi(CS s); |
8a512ed5 JH |
1299 | |
1300 | /* parse options */ | |
1301 | /*XXX should these options be common over scanner types? */ | |
1302 | if (clamd_option(cd, sublist, &subsep) != OK) | |
1303 | { | |
1304 | return m_errlog_defer(scanent, | |
1305 | string_sprintf("bad option '%s'", scanner_options)); | |
0f0c8159 JH |
1306 | continue; |
1307 | } | |
b1f8e4f8 | 1308 | |
8a512ed5 | 1309 | cv[num_servers++] = cd; |
0f0c8159 JH |
1310 | if (num_servers >= MAX_CLAMD_SERVERS) |
1311 | { | |
1312 | (void) m_errlog_defer(scanent, | |
1313 | US"More than " MAX_CLAMD_SERVERS_S " clamd servers " | |
1314 | "specified; only using the first " MAX_CLAMD_SERVERS_S ); | |
1315 | break; | |
1316 | } | |
8a512ed5 JH |
1317 | } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep, |
1318 | NULL, 0))); | |
8e669ac1 | 1319 | |
0f0c8159 JH |
1320 | /* check if we have at least one server */ |
1321 | if (!num_servers) | |
b1f8e4f8 | 1322 | return m_errlog_defer(scanent, |
0f0c8159 JH |
1323 | US"no useable server addresses in malware configuration option."); |
1324 | } | |
b1f8e4f8 | 1325 | |
0f0c8159 JH |
1326 | /* See the discussion of response formats below to see why we really |
1327 | don't like colons in filenames when passing filenames to ClamAV. */ | |
1328 | if (use_scan_command && Ustrchr(eml_filename, ':')) | |
1329 | return m_errlog_defer(scanent, | |
1330 | string_sprintf("local/SCAN mode incompatible with" \ | |
1331 | " : in path to email filename [%s]", eml_filename)); | |
b1f8e4f8 | 1332 | |
0f0c8159 JH |
1333 | /* We have some network servers specified */ |
1334 | if (num_servers) | |
1335 | { | |
1336 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd | |
1337 | * only supports AF_INET, but we should probably be looking to the | |
1338 | * future and rewriting this to be protocol-independent anyway. */ | |
b1f8e4f8 | 1339 | |
0f0c8159 JH |
1340 | while (num_servers > 0) |
1341 | { | |
8a512ed5 JH |
1342 | int i = random_number( num_servers ); |
1343 | clamd_address * cd = cv[i]; | |
b1f8e4f8 | 1344 | |
8a512ed5 JH |
1345 | DEBUG(D_acl) debug_printf("trying server name %s, port %u\n", |
1346 | cd->hostspec, cd->tcp_port); | |
0f0c8159 JH |
1347 | |
1348 | /* Lookup the host. This is to ensure that we connect to the same IP | |
1349 | * on both connections (as one host could resolve to multiple ips) */ | |
8a512ed5 | 1350 | for (;;) |
0f0c8159 | 1351 | { |
8a512ed5 JH |
1352 | sock= m_tcpsocket(cd->hostspec, cd->tcp_port, &connhost, &errstr); |
1353 | if (sock >= 0) | |
1354 | { | |
1355 | /* Connection successfully established with a server */ | |
1356 | hostname = cd->hostspec; | |
1357 | break; | |
1358 | } | |
1359 | if (cd->retry <= 0) break; | |
1360 | while (cd->retry > 0) cd->retry = sleep(cd->retry); | |
4e71661f | 1361 | } |
8a512ed5 JH |
1362 | if (sock >= 0) |
1363 | break; | |
b1f8e4f8 | 1364 | |
70817078 JH |
1365 | log_write(0, LOG_MAIN, "malware acl condition: %s: %s", |
1366 | scanent->name, errstr); | |
0f0c8159 JH |
1367 | |
1368 | /* Remove the server from the list. XXX We should free the memory */ | |
1369 | num_servers--; | |
8a512ed5 JH |
1370 | for (; i < num_servers; i++) |
1371 | cv[i] = cv[i+1]; | |
4e71661f | 1372 | } |
8e669ac1 | 1373 | |
0f0c8159 JH |
1374 | if (num_servers == 0) |
1375 | return m_errlog_defer(scanent, US"all servers failed"); | |
1376 | } | |
1377 | else | |
8a512ed5 JH |
1378 | for (;;) |
1379 | { | |
1380 | if ((sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0) | |
1381 | { | |
1382 | hostname = cv[0]->hostspec; | |
1383 | break; | |
1384 | } | |
1385 | if (cv[0]->retry <= 0) | |
1386 | return m_errlog_defer(scanent, errstr); | |
1387 | while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry); | |
1388 | } | |
b1f8e4f8 | 1389 | |
0f0c8159 JH |
1390 | /* have socket in variable "sock"; command to use is semi-independent of |
1391 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1392 | * domain socket, or explicitly told local) else we stream the data. | |
1393 | * How we stream the data depends upon how we were built. */ | |
1394 | ||
1395 | if (!use_scan_command) | |
1396 | { | |
4e71661f | 1397 | #ifdef WITH_OLD_CLAMAV_STREAM |
0f0c8159 JH |
1398 | /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to |
1399 | * that port on a second connection; then in the scan-method-neutral | |
1400 | * part, read the response back on the original connection. */ | |
b1f8e4f8 | 1401 | |
0f0c8159 JH |
1402 | DEBUG(D_acl) debug_printf( |
1403 | "Malware scan: issuing %s old-style remote scan (PORT)\n", | |
1404 | scanner_name); | |
b1f8e4f8 | 1405 | |
0f0c8159 JH |
1406 | /* Pass the string to ClamAV (7 = "STREAM\n") */ |
1407 | if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0) | |
1408 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 1409 | |
0f0c8159 JH |
1410 | memset(av_buffer2, 0, sizeof(av_buffer2)); |
1411 | bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), tmo-time(NULL)); | |
b1f8e4f8 | 1412 | |
0f0c8159 JH |
1413 | if (bread < 0) |
1414 | return m_errlog_defer_3(scanent, | |
1415 | string_sprintf("unable to read PORT from socket (%s)", | |
1416 | strerror(errno)), | |
1417 | sock); | |
b1f8e4f8 | 1418 | |
0f0c8159 JH |
1419 | if (bread == sizeof(av_buffer2)) |
1420 | return m_errlog_defer_3(scanent, "buffer too small", sock); | |
b1f8e4f8 | 1421 | |
0f0c8159 JH |
1422 | if (!(*av_buffer2)) |
1423 | return m_errlog_defer_3(scanent, "ClamAV returned null", sock); | |
b1f8e4f8 | 1424 | |
0f0c8159 JH |
1425 | av_buffer2[bread] = '\0'; |
1426 | if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) | |
1427 | return m_errlog_defer_3(scanent, | |
1428 | string_sprintf("Expected port information from clamd, got '%s'", | |
1429 | av_buffer2), | |
1430 | sock); | |
b1f8e4f8 | 1431 | |
0f0c8159 JH |
1432 | sockData = m_tcpsocket(connhost.address, port, NULL, &errstr); |
1433 | if (sockData < 0) | |
1434 | return m_errlog_defer_3(scanent, errstr, sock); | |
b1f8e4f8 | 1435 | |
4e71661f JH |
1436 | # define CLOSE_SOCKDATA (void)close(sockData) |
1437 | #else /* WITH_OLD_CLAMAV_STREAM not defined */ | |
0f0c8159 JH |
1438 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> |
1439 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1440 | chunk. */ | |
b1f8e4f8 | 1441 | |
0f0c8159 JH |
1442 | DEBUG(D_acl) debug_printf( |
1443 | "Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", | |
1444 | scanner_name); | |
b1f8e4f8 | 1445 | |
0f0c8159 JH |
1446 | /* Pass the string to ClamAV (10 = "zINSTREAM\0") */ |
1447 | if (send(sock, "zINSTREAM", 10, 0) < 0) | |
1448 | return m_errlog_defer_3(scanent, | |
1449 | string_sprintf("unable to send zINSTREAM to socket (%s)", | |
1450 | strerror(errno)), | |
1451 | sock); | |
b1f8e4f8 | 1452 | |
4e71661f JH |
1453 | # define CLOSE_SOCKDATA /**/ |
1454 | #endif | |
b1f8e4f8 | 1455 | |
0f0c8159 JH |
1456 | /* calc file size */ |
1457 | if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) | |
1458 | { | |
1459 | int err = errno; | |
1460 | CLOSE_SOCKDATA; | |
1461 | return m_errlog_defer_3(scanent, | |
1462 | string_sprintf("can't open spool file %s: %s", | |
1463 | eml_filename, strerror(err)), | |
1464 | sock); | |
1465 | } | |
1466 | if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) | |
1467 | { | |
1468 | int err = errno; | |
1469 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
1470 | return m_errlog_defer_3(scanent, | |
1471 | string_sprintf("can't seek spool file %s: %s", | |
1472 | eml_filename, strerror(err)), | |
1473 | sock); | |
1474 | } | |
1475 | fsize_uint = (unsigned int) fsize; | |
1476 | if ((off_t)fsize_uint != fsize) | |
1477 | { | |
1478 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
1479 | return m_errlog_defer_3(scanent, | |
1480 | string_sprintf("seeking spool file %s, size overflow", | |
1481 | eml_filename), | |
1482 | sock); | |
1483 | } | |
1484 | lseek(clam_fd, 0, SEEK_SET); | |
b1f8e4f8 | 1485 | |
0f0c8159 JH |
1486 | if (!(clamav_fbuf = (uschar *) malloc (fsize_uint))) |
1487 | { | |
1488 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
1489 | return m_errlog_defer_3(scanent, | |
1490 | string_sprintf("unable to allocate memory %u for file (%s)", | |
1491 | fsize_uint, eml_filename), | |
1492 | sock); | |
1493 | } | |
b1f8e4f8 | 1494 | |
0f0c8159 JH |
1495 | if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0) |
1496 | { | |
1497 | int err = errno; | |
1498 | free(clamav_fbuf); CLOSE_SOCKDATA; (void)close(clam_fd); | |
1499 | return m_errlog_defer_3(scanent, | |
1500 | string_sprintf("can't read spool file %s: %s", | |
1501 | eml_filename, strerror(err)), | |
1502 | sock); | |
1503 | } | |
1504 | (void)close(clam_fd); | |
b1f8e4f8 | 1505 | |
0f0c8159 | 1506 | /* send file body to socket */ |
4e71661f | 1507 | #ifdef WITH_OLD_CLAMAV_STREAM |
0f0c8159 JH |
1508 | if (send(sockData, clamav_fbuf, fsize_uint, 0) < 0) |
1509 | { | |
1510 | free(clamav_fbuf); CLOSE_SOCKDATA; | |
1511 | return m_errlog_defer_3(scanent, | |
1512 | string_sprintf("unable to send file body to socket (%s:%u)", | |
1513 | hostname, port), | |
1514 | sock); | |
1515 | } | |
4e71661f | 1516 | #else |
0f0c8159 JH |
1517 | send_size = htonl(fsize_uint); |
1518 | send_final_zeroblock = 0; | |
1519 | if ((send(sock, &send_size, sizeof(send_size), 0) < 0) || | |
1520 | (send(sock, clamav_fbuf, fsize_uint, 0) < 0) || | |
1521 | (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
1522 | { | |
b1f8e4f8 | 1523 | free(clamav_fbuf); |
0f0c8159 JH |
1524 | return m_errlog_defer_3(scanent, |
1525 | string_sprintf("unable to send file body to socket (%s)", hostname), | |
1526 | sock); | |
4e71661f | 1527 | } |
0f0c8159 | 1528 | #endif |
b1f8e4f8 | 1529 | |
0f0c8159 | 1530 | free(clamav_fbuf); |
b1f8e4f8 | 1531 | |
0f0c8159 JH |
1532 | CLOSE_SOCKDATA; |
1533 | #undef CLOSE_SOCKDATA | |
1534 | } | |
1535 | else | |
1536 | { /* use scan command */ | |
1537 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1538 | * scan-method-neutral part, read the response back */ | |
1539 | ||
1540 | /* ================================================================= */ | |
1541 | ||
1542 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1543 | which dates to when ClamAV needed us to break apart the email into the | |
1544 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1545 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1546 | doing this would actually have resulted in the mail attachments being | |
1547 | scanned twice, in the broken out files and from the original .eml. | |
1548 | Since ClamAV now handles emails (and has for quite some time) we can | |
1549 | just use the email file itself. */ | |
1550 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ | |
1551 | file_name = string_sprintf("SCAN %s\n", eml_filename); | |
1552 | ||
1553 | DEBUG(D_acl) debug_printf( | |
1554 | "Malware scan: issuing %s local-path scan [%s]\n", | |
1555 | scanner_name, scanner_options); | |
b1f8e4f8 | 1556 | |
0f0c8159 JH |
1557 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) |
1558 | return m_errlog_defer_3(scanent, | |
1559 | string_sprintf("unable to write to socket (%s)", strerror(errno)), | |
1560 | sock); | |
b1f8e4f8 | 1561 | |
0f0c8159 JH |
1562 | /* Do not shut down the socket for writing; a user report noted that |
1563 | * clamd 0.70 does not react well to this. */ | |
1564 | } | |
1565 | /* Commands have been sent, no matter which scan method or connection | |
1566 | * type we're using; now just read the result, independent of method. */ | |
1567 | ||
1568 | /* Read the result */ | |
1569 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1570 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
1571 | (void)close(sock); | |
1572 | sock = -1; | |
1573 | ||
1574 | if (bread <= 0) | |
1575 | return m_errlog_defer(scanent, | |
1576 | string_sprintf("unable to read from socket (%s)", | |
1577 | errno == 0 ? "EOF" : strerror(errno))); | |
1578 | ||
1579 | if (bread == sizeof(av_buffer)) | |
1580 | return m_errlog_defer(scanent, US"buffer too small"); | |
1581 | /* We're now assured of a NULL at the end of av_buffer */ | |
1582 | ||
1583 | /* Check the result. ClamAV returns one of two result formats. | |
1584 | In the basic mode, the response is of the form: | |
1585 | infected: -> "<filename>: <virusname> FOUND" | |
1586 | not-infected: -> "<filename>: OK" | |
1587 | error: -> "<filename>: <errcode> ERROR | |
1588 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1589 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1590 | for the infected case. Compare: | |
1591 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1592 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1593 | ||
1594 | In the streaming case, clamd uses the filename "stream" which you should | |
1595 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1596 | client app will replace "stream" with the original filename before returning | |
1597 | results to stdout, but the trace shows the data). | |
1598 | ||
1599 | We will assume that the pathname passed to clamd from Exim does not contain | |
1600 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1601 | passing a filename to clamd). */ | |
1602 | ||
1603 | if (!(*av_buffer)) | |
1604 | return m_errlog_defer(scanent, US"ClamAV returned null"); | |
1605 | ||
1606 | /* strip newline at the end (won't be present for zINSTREAM) | |
1607 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1608 | this below, so double-check) */ | |
1609 | p = av_buffer + Ustrlen(av_buffer) - 1; | |
1610 | if (*p == '\n') *p = '\0'; | |
1611 | ||
1612 | DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer); | |
1613 | ||
1614 | while (isspace(*--p) && (p > av_buffer)) | |
1615 | *p = '\0'; | |
1616 | if (*p) ++p; | |
0f0c8159 JH |
1617 | |
1618 | /* colon in returned output? */ | |
80591636 | 1619 | if(!(p = Ustrchr(av_buffer,':'))) |
0f0c8159 JH |
1620 | return m_errlog_defer(scanent, string_sprintf( |
1621 | "ClamAV returned malformed result (missing colon): %s", | |
1622 | av_buffer)); | |
1623 | ||
1624 | /* strip filename */ | |
1625 | while (*p && isspace(*++p)) /**/; | |
1626 | vname = p; | |
1627 | ||
1628 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1629 | but we should at least be resistant to it. */ | |
1630 | p = Ustrrchr(vname, ' '); | |
1631 | result_tag = p ? p+1 : vname; | |
1632 | ||
1633 | if (Ustrcmp(result_tag, "FOUND") == 0) | |
1634 | { | |
1635 | /* p should still be the whitespace before the result_tag */ | |
1636 | while (isspace(*p)) --p; | |
1637 | *++p = '\0'; | |
1638 | /* Strip off the extended information too, which will be in parens | |
1639 | after the virus name, with no intervening whitespace. */ | |
1640 | if (*--p == ')') | |
4e71661f | 1641 | { |
0f0c8159 JH |
1642 | /* "(hash:size)", so previous '(' will do; if not found, we have |
1643 | a curious virus name, but not an error. */ | |
1644 | p = Ustrrchr(vname, '('); | |
1645 | if (p) | |
1646 | *p = '\0'; | |
4e71661f | 1647 | } |
0f0c8159 JH |
1648 | malware_name = string_copy(vname); |
1649 | DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name); | |
b1f8e4f8 | 1650 | |
0f0c8159 JH |
1651 | } |
1652 | else if (Ustrcmp(result_tag, "ERROR") == 0) | |
1653 | return m_errlog_defer(scanent, | |
1654 | string_sprintf("ClamAV returned: %s", av_buffer)); | |
b1f8e4f8 | 1655 | |
0f0c8159 JH |
1656 | else if (Ustrcmp(result_tag, "OK") == 0) |
1657 | { | |
1658 | /* Everything should be OK */ | |
1659 | malware_name = NULL; | |
1660 | DEBUG(D_acl) debug_printf("Malware not found\n"); | |
b1f8e4f8 | 1661 | |
0f0c8159 JH |
1662 | } |
1663 | else | |
1664 | return m_errlog_defer(scanent, | |
1665 | string_sprintf("unparseable response from ClamAV: {%s}", av_buffer)); | |
1666 | ||
1667 | break; | |
b1f8e4f8 JH |
1668 | } /* clamd */ |
1669 | ||
1670 | case M_SOCK: /* "sock" scanner type ------------------------------------- */ | |
0f0c8159 JH |
1671 | /* This code was derived by Martin Poole from the clamd code contributed |
1672 | by David Saez and the cmdline code | |
1673 | */ | |
b1f8e4f8 | 1674 | { |
0f0c8159 JH |
1675 | int bread; |
1676 | uschar * commandline; | |
1677 | uschar av_buffer[1024]; | |
1678 | uschar * linebuffer; | |
1679 | uschar * sockline_scanner; | |
1680 | uschar sockline_scanner_default[] = "%s\n"; | |
1681 | const pcre *sockline_trig_re; | |
1682 | const pcre *sockline_name_re; | |
1683 | ||
1684 | /* find scanner command line */ | |
1685 | if ((sockline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
1686 | NULL, 0))) | |
1687 | { /* check for no expansions apart from one %s */ | |
1688 | uschar * s = Ustrchr(sockline_scanner, '%'); | |
1689 | if (s++) | |
1690 | if ((*s != 's' && *s != '%') || Ustrchr(s+1, '%')) | |
1691 | return m_errlog_defer_3(scanent, | |
1692 | US"unsafe sock scanner call spec", sock); | |
1693 | } | |
1694 | else | |
1695 | sockline_scanner = sockline_scanner_default; | |
b1f8e4f8 | 1696 | |
0f0c8159 JH |
1697 | /* find scanner output trigger */ |
1698 | sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1699 | "missing trigger specification", &errstr); | |
1700 | if (!sockline_trig_re) | |
1701 | return m_errlog_defer_3(scanent, errstr, sock); | |
b1f8e4f8 | 1702 | |
0f0c8159 JH |
1703 | /* find virus name regex */ |
1704 | sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1705 | "missing virus name regex specification", &errstr); | |
1706 | if (!sockline_name_re) | |
1707 | return m_errlog_defer_3(scanent, errstr, sock); | |
b1f8e4f8 | 1708 | |
0f0c8159 JH |
1709 | /* prepare scanner call - security depends on expansions check above */ |
1710 | commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id); | |
1711 | commandline = string_sprintf( CS sockline_scanner, CS commandline); | |
b1f8e4f8 JH |
1712 | |
1713 | ||
0f0c8159 JH |
1714 | /* Pass the command string to the socket */ |
1715 | if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0) | |
1716 | return m_errlog_defer(scanent, errstr); | |
b1f8e4f8 | 1717 | |
0f0c8159 JH |
1718 | /* Read the result */ |
1719 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
b1f8e4f8 | 1720 | |
0f0c8159 JH |
1721 | if (bread <= 0) |
1722 | return m_errlog_defer_3(scanent, | |
1723 | string_sprintf("unable to read from socket (%s)", strerror(errno)), | |
1724 | sock); | |
b1f8e4f8 | 1725 | |
0f0c8159 JH |
1726 | if (bread == sizeof(av_buffer)) |
1727 | return m_errlog_defer_3(scanent, US"buffer too small", sock); | |
1728 | av_buffer[bread] = '\0'; | |
1729 | linebuffer = string_copy(av_buffer); | |
b1f8e4f8 | 1730 | |
0f0c8159 JH |
1731 | /* try trigger match */ |
1732 | if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) | |
1733 | { | |
1734 | if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer))) | |
1735 | malware_name = US "unknown"; | |
b1f8e4f8 | 1736 | } |
0f0c8159 JH |
1737 | else /* no virus found */ |
1738 | malware_name = NULL; | |
1739 | break; | |
8523533c | 1740 | } |
8e669ac1 | 1741 | |
b1f8e4f8 JH |
1742 | case M_MKSD: /* "mksd" scanner type ------------------------------------- */ |
1743 | { | |
0f0c8159 JH |
1744 | char *mksd_options_end; |
1745 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1746 | int retval; | |
b1f8e4f8 | 1747 | |
0f0c8159 JH |
1748 | if (scanner_options) |
1749 | { | |
1750 | mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10); | |
1751 | if ( *scanner_options == '\0' | |
1752 | || *mksd_options_end != '\0' | |
1753 | || mksd_maxproc < 1 | |
1754 | || mksd_maxproc > 32 | |
1755 | ) | |
1756 | return m_errlog_defer(scanent, | |
1757 | string_sprintf("invalid option '%s'", scanner_options)); | |
1758 | } | |
8e669ac1 | 1759 | |
3e60dd41 | 1760 | if((sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0) |
0f0c8159 | 1761 | return m_errlog_defer(scanent, errstr); |
8e669ac1 | 1762 | |
0f0c8159 | 1763 | malware_name = NULL; |
94a18f28 | 1764 | |
0f0c8159 | 1765 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name); |
94a18f28 | 1766 | |
0f0c8159 JH |
1767 | if ((retval = mksd_scan_packed(scanent, sock, eml_filename, tmo)) != OK) |
1768 | { | |
1769 | close (sock); | |
1770 | return retval; | |
1771 | } | |
1772 | break; | |
8523533c | 1773 | } |
0f0c8159 | 1774 | |
b6fbf22d JH |
1775 | case M_AVAST: /* "avast" scanner type ----------------------------------- */ |
1776 | { | |
1777 | int ovector[1*3]; | |
1778 | uschar buf[1024]; | |
1779 | uschar * scanrequest; | |
b6fbf22d | 1780 | enum {AVA_HELO, AVA_OPT, AVA_RSP, AVA_DONE} avast_stage; |
0f0c8159 | 1781 | int nread; |
b6fbf22d JH |
1782 | |
1783 | /* According to Martin Tuma @avast the protocol uses "escaped | |
1784 | whitespace", that is, every embedded whitespace is backslash | |
1785 | escaped, as well as backslash is protected by backslash. | |
1786 | The returned lines contain the name of the scanned file, a tab | |
1787 | and the [ ] marker. | |
1788 | [+] - not infected | |
1789 | [L] - infected | |
1790 | [E] - some error occured | |
1791 | Such marker follows the first non-escaped TAB. */ | |
476be7e2 JH |
1792 | if ( ( !ava_re_clean |
1793 | && !(ava_re_clean = m_pcre_compile(ava_re_clean_str, &errstr))) | |
1794 | || ( !ava_re_virus | |
1795 | && !(ava_re_virus = m_pcre_compile(ava_re_virus_str, &errstr))) | |
b6fbf22d JH |
1796 | ) |
1797 | return malware_errlog_defer(errstr); | |
1798 | ||
1799 | /* wait for result */ | |
0f0c8159 JH |
1800 | for (avast_stage = AVA_HELO; |
1801 | (nread = recv_line(sock, buf, sizeof(buf), tmo)) > 0; | |
1802 | ) | |
b6fbf22d JH |
1803 | { |
1804 | int slen = Ustrlen(buf); | |
94431adb | 1805 | if (slen >= 1) |
b6fbf22d JH |
1806 | { |
1807 | DEBUG(D_acl) debug_printf("got from avast: %s\n", buf); | |
1808 | switch (avast_stage) | |
1809 | { | |
1810 | case AVA_HELO: | |
1811 | if (Ustrncmp(buf, "220", 3) != 0) | |
1812 | goto endloop; /* require a 220 */ | |
1813 | goto sendreq; | |
1814 | ||
1815 | case AVA_OPT: | |
1816 | if (Ustrncmp(buf, "210", 3) == 0) | |
1817 | break; /* ignore 210 responses */ | |
1818 | if (Ustrncmp(buf, "200", 3) != 0) | |
1819 | goto endloop; /* require a 200 */ | |
1820 | ||
1821 | sendreq: | |
1822 | { | |
1823 | int len; | |
1824 | /* Check for another option to send. Newline-terminate it. */ | |
1825 | if ((scanrequest = string_nextinlist(&av_scanner_work, &sep, | |
1826 | NULL, 0))) | |
1827 | { | |
1828 | scanrequest = string_sprintf("%s\n", scanrequest); | |
1829 | avast_stage = AVA_OPT; /* just sent option */ | |
1830 | } | |
1831 | else | |
1832 | { | |
1833 | scanrequest = string_sprintf("SCAN %s/scan/%s\n", | |
1834 | spool_directory, message_id); | |
1835 | avast_stage = AVA_RSP; /* just sent command */ | |
1836 | } | |
1837 | ||
1838 | /* send config-cmd or scan-request to socket */ | |
1839 | len = Ustrlen(scanrequest); | |
1840 | if (send(sock, scanrequest, len, 0) < 0) | |
1841 | { | |
1842 | scanrequest[len-1] = '\0'; | |
1843 | return m_errlog_defer_3(scanent, string_sprintf( | |
1844 | "unable to send request '%s' to socket (%s): %s", | |
1845 | scanrequest, scanner_options, strerror(errno)), sock); | |
1846 | } | |
1847 | break; | |
1848 | } | |
1849 | ||
1850 | case AVA_RSP: | |
1851 | if (Ustrncmp(buf, "210", 3) == 0) | |
1852 | break; /* ignore the "210 SCAN DATA" message */ | |
1853 | ||
476be7e2 | 1854 | if (pcre_exec(ava_re_clean, NULL, CS buf, slen, |
b6fbf22d JH |
1855 | 0, 0, ovector, nelements(ovector)) > 0) |
1856 | break; | |
1857 | ||
476be7e2 | 1858 | if ((malware_name = m_pcre_exec(ava_re_virus, buf))) |
b6fbf22d JH |
1859 | { /* remove backslash in front of [whitespace|backslash] */ |
1860 | uschar * p, * p0; | |
94431adb | 1861 | for (p = malware_name; *p; ++p) |
b6fbf22d JH |
1862 | if (*p == '\\' && (isspace(p[1]) || p[1] == '\\')) |
1863 | for (p0 = p; *p0; ++p0) *p0 = p0[1]; | |
94431adb | 1864 | |
b6fbf22d JH |
1865 | avast_stage = AVA_DONE; |
1866 | goto endloop; | |
1867 | } | |
1868 | ||
94431adb | 1869 | if (Ustrncmp(buf, "200 SCAN OK", 11) == 0) |
b6fbf22d JH |
1870 | { /* we're done finally */ |
1871 | if (send(sock, "QUIT\n", 5, 0) < 0) /* courtesy */ | |
1872 | return m_errlog_defer_3(scanent, string_sprintf( | |
1873 | "unable to send quit request to socket (%s): %s", | |
1874 | scanner_options, strerror(errno)), | |
1875 | sock); | |
1876 | malware_name = NULL; | |
1877 | avast_stage = AVA_DONE; | |
1878 | goto endloop; | |
1879 | } | |
1880 | ||
1881 | /* here for any unexpected response from the scanner */ | |
1882 | goto endloop; | |
755762fd HSHR |
1883 | |
1884 | case AVA_DONE: log_write(0, LOG_PANIC, "%s:%d:%s: should not happen", | |
1885 | __FILE__, __LINE__, __FUNCTION__); | |
b6fbf22d | 1886 | } |
0f0c8159 | 1887 | } |
b6fbf22d | 1888 | } |
b6fbf22d JH |
1889 | endloop: |
1890 | ||
1891 | switch(avast_stage) | |
1892 | { | |
94431adb | 1893 | case AVA_HELO: |
b6fbf22d | 1894 | case AVA_OPT: |
0f0c8159 JH |
1895 | case AVA_RSP: return m_errlog_defer_3(scanent, |
1896 | nread >= 0 | |
1897 | ? string_sprintf( | |
1898 | "invalid response from scanner: '%s'", buf) | |
1899 | : nread == -1 | |
1900 | ? US"EOF from scanner" | |
1901 | : US"timeout from scanner", | |
1902 | sock); | |
b6fbf22d JH |
1903 | default: break; |
1904 | } | |
1905 | } | |
0f0c8159 JH |
1906 | break; |
1907 | } /* scanner type switch */ | |
8523533c | 1908 | |
0f0c8159 JH |
1909 | if (sock >= 0) |
1910 | (void) close (sock); | |
1911 | malware_ok = TRUE; /* set "been here, done that" marker */ | |
b1f8e4f8 | 1912 | } |
8523533c | 1913 | |
0f0c8159 JH |
1914 | /* match virus name against pattern (caseless ------->----------v) */ |
1915 | if (malware_name && regex_match_and_setup(re, malware_name, 0, -1)) | |
1916 | { | |
1917 | DEBUG(D_acl) debug_printf( | |
1918 | "Matched regex to malware [%s] [%s]\n", malware_re, malware_name); | |
1919 | return OK; | |
1920 | } | |
1921 | else | |
1922 | return FAIL; | |
8523533c TK |
1923 | } |
1924 | ||
1925 | ||
0f0c8159 JH |
1926 | /************************************************* |
1927 | * Scan an email for malware * | |
1928 | *************************************************/ | |
8523533c | 1929 | |
0f0c8159 JH |
1930 | /* This is the normal interface for scanning an email, which doesn't need a |
1931 | filename; it's a wrapper around the malware_file function. | |
8523533c | 1932 | |
0f0c8159 JH |
1933 | Arguments: |
1934 | malware_re match condition for "malware=" | |
1935 | timeout if nonzero, timeout in seconds | |
1936 | ||
1937 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
1938 | where true means malware was found (condition applies) | |
1939 | */ | |
1940 | int | |
1941 | malware(const uschar * malware_re, int timeout) | |
8523533c | 1942 | { |
0f0c8159 JH |
1943 | uschar * scan_filename; |
1944 | int ret; | |
8e669ac1 | 1945 | |
0f0c8159 JH |
1946 | scan_filename = string_sprintf("%s/scan/%s/%s.eml", |
1947 | spool_directory, message_id, message_id); | |
1948 | ret = malware_internal(malware_re, scan_filename, timeout, FALSE); | |
1949 | if (ret == DEFER) av_failed = TRUE; | |
1950 | ||
1951 | return ret; | |
8523533c TK |
1952 | } |
1953 | ||
8e669ac1 | 1954 | |
0f0c8159 JH |
1955 | /************************************************* |
1956 | * Scan a file for malware * | |
1957 | *************************************************/ | |
8e669ac1 | 1958 | |
0f0c8159 JH |
1959 | /* This is a test wrapper for scanning an email, which is not used in |
1960 | normal processing. Scan any file, using the Exim scanning interface. | |
1961 | This function tampers with various global variables so is unsafe to use | |
1962 | in any other context. | |
8e669ac1 | 1963 | |
0f0c8159 JH |
1964 | Arguments: |
1965 | eml_filename a file holding the message to be scanned | |
8523533c | 1966 | |
0f0c8159 JH |
1967 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) |
1968 | where true means malware was found (condition applies) | |
1969 | */ | |
1970 | int | |
1971 | malware_in_file(uschar *eml_filename) | |
8523533c | 1972 | { |
0f0c8159 JH |
1973 | uschar message_id_buf[64]; |
1974 | int ret; | |
8523533c | 1975 | |
0f0c8159 JH |
1976 | /* spool_mbox() assumes various parameters exist, when creating |
1977 | the relevant directory and the email within */ | |
1978 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
1979 | "dummy-%d", vaguely_random_number(INT_MAX)); | |
1980 | message_id = message_id_buf; | |
1981 | sender_address = US"malware-sender@example.net"; | |
1982 | return_path = US""; | |
1983 | recipients_list = NULL; | |
1984 | receive_add_recipient(US"malware-victim@example.net", -1); | |
1985 | enable_dollar_recipients = TRUE; | |
8e669ac1 | 1986 | |
0f0c8159 | 1987 | ret = malware_internal(US"*", eml_filename, 0, TRUE); |
8544e77a | 1988 | |
0f0c8159 JH |
1989 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
1990 | spool_mbox_ok = 1; | |
1991 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
1992 | set, but if that changes, then it should apply to these tests too */ | |
1993 | unspool_mbox(); | |
8e669ac1 | 1994 | |
0f0c8159 JH |
1995 | /* silence static analysis tools */ |
1996 | message_id = NULL; | |
8e669ac1 | 1997 | |
0f0c8159 | 1998 | return ret; |
8523533c TK |
1999 | } |
2000 | ||
476be7e2 JH |
2001 | |
2002 | void | |
2003 | malware_init(void) | |
2004 | { | |
2005 | if (!malware_default_re) | |
2006 | malware_default_re = regex_must_compile(malware_regex_default, FALSE, TRUE); | |
2007 | if (!drweb_re) | |
2008 | drweb_re = regex_must_compile(drweb_re_str, FALSE, TRUE); | |
2009 | if (!fsec_re) | |
2010 | fsec_re = regex_must_compile(fsec_re_str, FALSE, TRUE); | |
2011 | if (!kav_re_sus) | |
2012 | kav_re_sus = regex_must_compile(kav_re_sus_str, FALSE, TRUE); | |
2013 | if (!kav_re_inf) | |
2014 | kav_re_inf = regex_must_compile(kav_re_inf_str, FALSE, TRUE); | |
2015 | if (!ava_re_clean) | |
2016 | ava_re_clean = regex_must_compile(ava_re_clean_str, FALSE, TRUE); | |
2017 | if (!ava_re_virus) | |
2018 | ava_re_virus = regex_must_compile(ava_re_virus_str, FALSE, TRUE); | |
2019 | } | |
2020 | ||
b1f8e4f8 JH |
2021 | #endif /*WITH_CONTENT_SCAN*/ |
2022 | /* | |
2023 | * vi: aw ai sw=2 | |
2024 | */ |