Commit | Line | Data |
---|---|---|
8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 JH |
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 |
6 | * License: GPL | |
7 | * Copyright (c) The Exim Maintainers 2016 | |
8 | */ | |
8523533c TK |
9 | |
10 | /* Code for calling virus (malware) scanners. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
13 | #ifdef WITH_CONTENT_SCAN | |
14 | ||
b1f8e4f8 | 15 | typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL, |
b6fbf22d | 16 | M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD, M_AVAST} scanner_t; |
b1f8e4f8 JH |
17 | typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t; |
18 | static struct scan | |
19 | { | |
20 | scanner_t scancode; | |
21 | const uschar * name; | |
22 | const uschar * options_default; | |
23 | contype_t conn; | |
24 | } m_scans[] = | |
25 | { | |
26 | { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP }, | |
27 | { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM }, | |
28 | { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX }, | |
29 | { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX }, | |
30 | { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX }, | |
31 | { M_CMDL, US"cmdline", NULL, MC_NONE }, | |
32 | { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX }, | |
33 | { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE }, | |
34 | { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM }, | |
35 | { M_MKSD, US"mksd", NULL, MC_NONE }, | |
b6fbf22d | 36 | { M_AVAST, US"avast", US"/var/run/avast/scan.sock", MC_STRM }, |
b1f8e4f8 JH |
37 | { -1, NULL, NULL, MC_NONE } /* end-marker */ |
38 | }; | |
39 | ||
599dcb77 TL |
40 | /* The maximum number of clamd servers that are supported in the configuration */ |
41 | #define MAX_CLAMD_SERVERS 32 | |
42 | #define MAX_CLAMD_SERVERS_S "32" | |
599dcb77 | 43 | |
8a512ed5 JH |
44 | typedef struct clamd_address { |
45 | uschar * hostspec; | |
46 | unsigned tcp_port; | |
47 | unsigned retry; | |
48 | } clamd_address; | |
599dcb77 | 49 | |
b1f8e4f8 JH |
50 | #ifndef nelements |
51 | # define nelements(arr) (sizeof(arr) / sizeof(arr[0])) | |
8523533c TK |
52 | #endif |
53 | ||
a9ccd69a | 54 | |
0f0c8159 | 55 | #define MALWARE_TIMEOUT 120 /* default timeout, seconds */ |
a9ccd69a PH |
56 | |
57 | ||
8523533c TK |
58 | #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ |
59 | #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
60 | #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
61 | ||
2376f2f5 TK |
62 | #define DERR_READ_ERR (1<<0) /* read error */ |
63 | #define DERR_NOMEMORY (1<<2) /* no memory */ | |
64 | #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
65 | #define DERR_BAD_CALL (1<<15) /* wrong command */ | |
66 | ||
476be7e2 JH |
67 | |
68 | static const uschar * malware_regex_default = US ".+"; | |
69 | static const pcre * malware_default_re = NULL; | |
70 | ||
71 | static const uschar * drweb_re_str = US "infected\\swith\\s*(.+?)$"; | |
72 | static const pcre * drweb_re = NULL; | |
73 | ||
74 | static const uschar * fsec_re_str = US "\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$"; | |
75 | static const pcre * fsec_re = NULL; | |
76 | ||
77 | static const uschar * kav_re_sus_str = US "suspicion:\\s*(.+?)\\s*$"; | |
78 | static const uschar * kav_re_inf_str = US "infected:\\s*(.+?)\\s*$"; | |
79 | static const pcre * kav_re_sus = NULL; | |
80 | static const pcre * kav_re_inf = NULL; | |
81 | ||
82 | static const uschar * ava_re_clean_str = US "(?!\\\\)\\t\\[\\+\\]"; | |
83 | static const uschar * ava_re_virus_str = US "(?!\\\\)\\t\\[L\\]\\d\\.\\d\\t\\d\\s(.*)"; | |
84 | static const pcre * ava_re_clean = NULL; | |
85 | static const pcre * ava_re_virus = NULL; | |
86 | ||
87 | ||
88 | ||
89 | /******************************************************************************/ | |
90 | ||
b1f8e4f8 | 91 | /* Routine to check whether a system is big- or little-endian. |
8523533c TK |
92 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
93 | Needed for proper kavdaemon implementation. Sigh. */ | |
94 | #define BIG_MY_ENDIAN 0 | |
95 | #define LITTLE_MY_ENDIAN 1 | |
b1f8e4f8 JH |
96 | static int test_byte_order(void); |
97 | static inline int | |
98 | test_byte_order() | |
99 | { | |
100 | short int word = 0x0001; | |
101 | char *byte = (char *) &word; | |
102 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); | |
8523533c TK |
103 | } |
104 | ||
b1f8e4f8 | 105 | BOOL malware_ok = FALSE; |
8523533c | 106 | |
8544e77a PP |
107 | /* Gross hacks for the -bmalware option; perhaps we should just create |
108 | the scan directory normally for that case, but look into rigging up the | |
109 | needed header variables if not already set on the command-line? */ | |
110 | extern int spool_mbox_ok; | |
111 | extern uschar spooled_message_id[17]; | |
112 | ||
8544e77a PP |
113 | |
114 | ||
b1f8e4f8 JH |
115 | static inline int |
116 | malware_errlog_defer(const uschar * str) | |
117 | { | |
8a512ed5 JH |
118 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str); |
119 | return DEFER; | |
b1f8e4f8 JH |
120 | } |
121 | ||
122 | static int | |
0ea02355 JH |
123 | m_errlog_defer(struct scan * scanent, const uschar * hostport, |
124 | const uschar * str) | |
b1f8e4f8 | 125 | { |
0ea02355 JH |
126 | return malware_errlog_defer(string_sprintf("%s %s : %s", |
127 | scanent->name, hostport ? hostport : CUS"", str)); | |
b1f8e4f8 JH |
128 | } |
129 | static int | |
0ea02355 JH |
130 | m_errlog_defer_3(struct scan * scanent, const uschar * hostport, |
131 | const uschar * str, int fd_to_close) | |
b1f8e4f8 | 132 | { |
8a512ed5 | 133 | (void) close(fd_to_close); |
0ea02355 | 134 | return m_errlog_defer(scanent, hostport, str); |
b1f8e4f8 JH |
135 | } |
136 | ||
137 | /*************************************************/ | |
138 | ||
139 | /* Only used by the Clamav code, which is working from a list of servers and | |
140 | uses the returned in_addr to get a second connection to the same system. | |
141 | */ | |
142 | static inline int | |
143 | m_tcpsocket(const uschar * hostname, unsigned int port, | |
144 | host_item * host, uschar ** errstr) | |
145 | { | |
8a512ed5 | 146 | return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr); |
b1f8e4f8 JH |
147 | } |
148 | ||
b1f8e4f8 JH |
149 | static int |
150 | m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr) | |
151 | { | |
8a512ed5 JH |
152 | if (send(sock, buf, cnt, 0) < 0) |
153 | { | |
154 | int err = errno; | |
155 | (void)close(sock); | |
156 | *errstr = string_sprintf("unable to send to socket (%s): %s", | |
157 | buf, strerror(err)); | |
158 | return -1; | |
159 | } | |
160 | return sock; | |
b1f8e4f8 JH |
161 | } |
162 | ||
163 | static const pcre * | |
164 | m_pcre_compile(const uschar * re, uschar ** errstr) | |
165 | { | |
8a512ed5 JH |
166 | const uschar * rerror; |
167 | int roffset; | |
168 | const pcre * cre; | |
169 | ||
170 | cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
171 | if (!cre) | |
172 | *errstr= string_sprintf("regular expression error in '%s': %s at offset %d", | |
173 | re, rerror, roffset); | |
174 | return cre; | |
b1f8e4f8 JH |
175 | } |
176 | ||
177 | uschar * | |
178 | m_pcre_exec(const pcre * cre, uschar * text) | |
179 | { | |
8a512ed5 JH |
180 | int ovector[10*3]; |
181 | int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0, | |
182 | ovector, nelements(ovector)); | |
183 | uschar * substr = NULL; | |
184 | if (i >= 2) /* Got it */ | |
185 | pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr); | |
186 | return substr; | |
b1f8e4f8 JH |
187 | } |
188 | ||
189 | static const pcre * | |
55414b25 JH |
190 | m_pcre_nextinlist(const uschar ** list, int * sep, |
191 | char * listerr, uschar ** errstr) | |
b1f8e4f8 | 192 | { |
8a512ed5 JH |
193 | const uschar * list_ele; |
194 | const pcre * cre = NULL; | |
195 | ||
196 | if (!(list_ele = string_nextinlist(list, sep, NULL, 0))) | |
197 | *errstr = US listerr; | |
198 | else | |
199 | cre = m_pcre_compile(CUS list_ele, errstr); | |
200 | return cre; | |
b1f8e4f8 JH |
201 | } |
202 | ||
4e71661f JH |
203 | /* |
204 | Simple though inefficient wrapper for reading a line. Drop CRs and the | |
205 | trailing newline. Can return early on buffer full. Null-terminate. | |
206 | Apply initial timeout if no data ready. | |
207 | ||
0f0c8159 JH |
208 | Return: number of chars - zero for an empty line |
209 | -1 on EOF | |
210 | -2 on timeout or error | |
4e71661f JH |
211 | */ |
212 | static int | |
213 | recv_line(int fd, uschar * buffer, int bsize, int tmo) | |
214 | { | |
215 | uschar * p = buffer; | |
216 | ssize_t rcv; | |
0f0c8159 | 217 | BOOL ok = FALSE; |
4e71661f JH |
218 | |
219 | if (!fd_ready(fd, tmo-time(NULL))) | |
0f0c8159 | 220 | return -2; |
4e71661f | 221 | |
0f0c8159 | 222 | /*XXX tmo handling assumes we always get a whole line */ |
4e71661f | 223 | /* read until \n */ |
0f0c8159 | 224 | errno = 0; |
4e71661f JH |
225 | while ((rcv = read(fd, p, 1)) > 0) |
226 | { | |
0f0c8159 | 227 | ok = TRUE; |
4e71661f JH |
228 | if (p-buffer > bsize-2) break; |
229 | if (*p == '\n') break; | |
230 | if (*p != '\r') p++; | |
231 | } | |
0f0c8159 JH |
232 | if (!ok) |
233 | { | |
234 | DEBUG(D_acl) debug_printf("Malware scan: read %s (%s)\n", | |
235 | rcv==0 ? "EOF" : "error", strerror(errno)); | |
236 | return rcv==0 ? -1 : -2; | |
237 | } | |
4e71661f JH |
238 | *p = '\0'; |
239 | ||
240 | DEBUG(D_acl) debug_printf("Malware scan: read '%s'\n", buffer); | |
241 | return p - buffer; | |
242 | } | |
243 | ||
244 | /* return TRUE iff size as requested */ | |
245 | static BOOL | |
246 | recv_len(int sock, void * buf, int size, int tmo) | |
247 | { | |
248 | return fd_ready(sock, tmo-time(NULL)) | |
249 | ? recv(sock, buf, size, 0) == size | |
250 | : FALSE; | |
251 | } | |
252 | ||
253 | ||
0f0c8159 JH |
254 | |
255 | /* ============= private routines for the "mksd" scanner type ============== */ | |
256 | ||
257 | #include <sys/uio.h> | |
258 | ||
259 | static inline int | |
260 | mksd_writev (int sock, struct iovec * iov, int iovcnt) | |
261 | { | |
262 | int i; | |
263 | ||
264 | for (;;) | |
265 | { | |
266 | do | |
267 | i = writev (sock, iov, iovcnt); | |
268 | while (i < 0 && errno == EINTR); | |
269 | if (i <= 0) | |
270 | { | |
271 | (void) malware_errlog_defer( | |
272 | US"unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
273 | return -1; | |
274 | } | |
275 | for (;;) /* check for short write */ | |
276 | if (i >= iov->iov_len) | |
277 | { | |
278 | if (--iovcnt == 0) | |
279 | return 0; | |
280 | i -= iov->iov_len; | |
281 | iov++; | |
282 | } | |
283 | else | |
284 | { | |
285 | iov->iov_len -= i; | |
286 | iov->iov_base = CS iov->iov_base + i; | |
287 | break; | |
288 | } | |
289 | } | |
290 | } | |
291 | ||
292 | static inline int | |
293 | mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size, int tmo) | |
294 | { | |
295 | int offset = 0; | |
296 | int i; | |
297 | ||
298 | do | |
299 | { | |
300 | i = ip_recv(sock, av_buffer+offset, av_buffer_size-offset, tmo-time(NULL)); | |
301 | if (i <= 0) | |
302 | { | |
303 | (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
304 | return -1; | |
305 | } | |
306 | ||
307 | offset += i; | |
308 | /* offset == av_buffer_size -> buffer full */ | |
309 | if (offset == av_buffer_size) | |
310 | { | |
311 | (void) malware_errlog_defer(US"malformed reply received from mksd"); | |
312 | return -1; | |
313 | } | |
314 | } while (av_buffer[offset-1] != '\n'); | |
315 | ||
316 | av_buffer[offset] = '\0'; | |
317 | return offset; | |
318 | } | |
319 | ||
320 | static inline int | |
321 | mksd_parse_line(struct scan * scanent, char * line) | |
322 | { | |
323 | char *p; | |
324 | ||
325 | switch (*line) | |
326 | { | |
327 | case 'O': /* OK */ | |
328 | return OK; | |
329 | ||
330 | case 'E': | |
331 | case 'A': /* ERR */ | |
332 | if ((p = strchr (line, '\n')) != NULL) | |
333 | *p = '\0'; | |
0ea02355 | 334 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
335 | string_sprintf("scanner failed: %s", line)); |
336 | ||
337 | default: /* VIR */ | |
338 | if ((p = strchr (line, '\n')) != NULL) | |
339 | { | |
340 | *p = '\0'; | |
341 | if ( p-line > 5 | |
342 | && line[3] == ' ' | |
343 | && (p = strchr(line+4, ' ')) != NULL | |
344 | && p-line > 4 | |
345 | ) | |
346 | { | |
347 | *p = '\0'; | |
348 | malware_name = string_copy(US line+4); | |
349 | return OK; | |
350 | } | |
351 | } | |
0ea02355 | 352 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
353 | string_sprintf("malformed reply received: %s", line)); |
354 | } | |
355 | } | |
356 | ||
357 | static int | |
358 | mksd_scan_packed(struct scan * scanent, int sock, const uschar * scan_filename, | |
359 | int tmo) | |
360 | { | |
361 | struct iovec iov[3]; | |
362 | const char *cmd = "MSQ\n"; | |
363 | uschar av_buffer[1024]; | |
364 | ||
365 | iov[0].iov_base = (void *) cmd; | |
366 | iov[0].iov_len = 3; | |
367 | iov[1].iov_base = (void *) scan_filename; | |
368 | iov[1].iov_len = Ustrlen(scan_filename); | |
369 | iov[2].iov_base = (void *) (cmd + 3); | |
370 | iov[2].iov_len = 1; | |
371 | ||
372 | if (mksd_writev (sock, iov, 3) < 0) | |
373 | return DEFER; | |
374 | ||
375 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer), tmo) < 0) | |
376 | return DEFER; | |
377 | ||
378 | return mksd_parse_line (scanent, CS av_buffer); | |
379 | } | |
380 | ||
8a512ed5 JH |
381 | |
382 | static int | |
383 | clamd_option(clamd_address * cd, const uschar * optstr, int * subsep) | |
384 | { | |
385 | uschar * s; | |
386 | ||
387 | cd->retry = 0; | |
388 | while ((s = string_nextinlist(&optstr, subsep, NULL, 0))) | |
8a512ed5 JH |
389 | if (Ustrncmp(s, "retry=", 6) == 0) |
390 | { | |
391 | int sec = readconf_readtime((s += 6), '\0', FALSE); | |
392 | if (sec < 0) | |
393 | return FAIL; | |
394 | cd->retry = sec; | |
395 | } | |
396 | else | |
397 | return FAIL; | |
93a6fce2 | 398 | return OK; |
8a512ed5 JH |
399 | } |
400 | ||
8544e77a PP |
401 | /************************************************* |
402 | * Scan content for malware * | |
403 | *************************************************/ | |
404 | ||
405 | /* This is an internal interface for scanning an email; the normal interface | |
406 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
407 | ||
408 | Arguments: | |
0f0c8159 | 409 | malware_re match condition for "malware=" |
8544e77a | 410 | eml_filename the file holding the email to be scanned |
0f0c8159 | 411 | timeout if nonzero, non-default timeoutl |
8544e77a PP |
412 | faking whether or not we're faking this up for the -bmalware test |
413 | ||
414 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
415 | where true means malware was found (condition applies) | |
416 | */ | |
b1f8e4f8 | 417 | static int |
0f0c8159 JH |
418 | malware_internal(const uschar * malware_re, const uschar * eml_filename, |
419 | int timeout, BOOL faking) | |
b1f8e4f8 | 420 | { |
0f0c8159 | 421 | int sep = 0; |
55414b25 | 422 | const uschar *av_scanner_work = av_scanner; |
0f0c8159 | 423 | uschar *scanner_name; |
0f0c8159 JH |
424 | unsigned long mbox_size; |
425 | FILE *mbox_file; | |
426 | const pcre *re; | |
427 | uschar * errstr; | |
428 | struct scan * scanent; | |
429 | const uschar * scanner_options; | |
430 | int sock = -1; | |
431 | time_t tmo; | |
432 | ||
433 | /* make sure the eml mbox file is spooled up */ | |
434 | if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL))) | |
435 | return malware_errlog_defer(US"error while creating mbox spool file"); | |
436 | ||
437 | /* none of our current scanners need the mbox | |
438 | file as a stream, so we can close it right away */ | |
439 | (void)fclose(mbox_file); | |
440 | ||
441 | if (!malware_re) | |
442 | return FAIL; /* empty means "don't match anything" */ | |
443 | ||
444 | /* parse 1st option */ | |
445 | if ( (strcmpic(malware_re, US"false") == 0) || | |
446 | (Ustrcmp(malware_re,"0") == 0) ) | |
447 | return FAIL; /* explicitly no matching */ | |
448 | ||
449 | /* special cases (match anything except empty) */ | |
476be7e2 JH |
450 | if ( strcmpic(malware_re,US"true") == 0 |
451 | || Ustrcmp(malware_re,"*") == 0 | |
452 | || Ustrcmp(malware_re,"1") == 0 | |
453 | ) | |
454 | { | |
455 | if ( !malware_default_re | |
456 | && !(malware_default_re = m_pcre_compile(malware_regex_default, &errstr))) | |
457 | return malware_errlog_defer(errstr); | |
0f0c8159 | 458 | malware_re = malware_regex_default; |
476be7e2 JH |
459 | re = malware_default_re; |
460 | } | |
0f0c8159 JH |
461 | |
462 | /* compile the regex, see if it works */ | |
476be7e2 | 463 | else if (!(re = m_pcre_compile(malware_re, &errstr))) |
0f0c8159 JH |
464 | return malware_errlog_defer(errstr); |
465 | ||
476be7e2 JH |
466 | /* Reset sep that is set by previous string_nextinlist() call */ |
467 | sep = 0; | |
468 | ||
0f0c8159 JH |
469 | /* if av_scanner starts with a dollar, expand it first */ |
470 | if (*av_scanner == '$') | |
471 | { | |
472 | if (!(av_scanner_work = expand_string(av_scanner))) | |
473 | return malware_errlog_defer( | |
474 | string_sprintf("av_scanner starts with $, but expansion failed: %s", | |
475 | expand_string_message)); | |
b1f8e4f8 | 476 | |
0f0c8159 | 477 | DEBUG(D_acl) |
b1f8e4f8 | 478 | debug_printf("Expanded av_scanner global: %s\n", av_scanner_work); |
0f0c8159 JH |
479 | /* disable result caching in this case */ |
480 | malware_name = NULL; | |
481 | malware_ok = FALSE; | |
8523533c TK |
482 | } |
483 | ||
0f0c8159 JH |
484 | /* Do not scan twice (unless av_scanner is dynamic). */ |
485 | if (!malware_ok) | |
486 | { | |
487 | /* find the scanner type from the av_scanner option */ | |
488 | if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
489 | return malware_errlog_defer(US"av_scanner configuration variable is empty"); | |
490 | if (!timeout) timeout = MALWARE_TIMEOUT; | |
491 | tmo = time(NULL) + timeout; | |
492 | ||
3e60dd41 JH |
493 | for (scanent = m_scans; ; scanent++) |
494 | { | |
0f0c8159 JH |
495 | if (!scanent->name) |
496 | return malware_errlog_defer(string_sprintf("unknown scanner type '%s'", | |
497 | scanner_name)); | |
498 | if (strcmpic(scanner_name, US scanent->name) != 0) | |
499 | continue; | |
500 | if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
501 | scanner_options = scanent->options_default; | |
502 | if (scanent->conn == MC_NONE) | |
b1f8e4f8 | 503 | break; |
0f0c8159 JH |
504 | switch(scanent->conn) |
505 | { | |
3e60dd41 JH |
506 | case MC_TCP: sock = ip_tcpsocket(scanner_options, &errstr, 5); break; |
507 | case MC_UNIX: sock = ip_unixsocket(scanner_options, &errstr); break; | |
508 | case MC_STRM: sock = ip_streamsocket(scanner_options, &errstr, 5); break; | |
0f0c8159 | 509 | default: /* compiler quietening */ break; |
384152a6 | 510 | } |
0f0c8159 | 511 | if (sock < 0) |
0ea02355 | 512 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
513 | break; |
514 | } | |
515 | DEBUG(D_acl) debug_printf("Malware scan: %s tmo %s\n", scanner_name, readconf_printtime(timeout)); | |
8e669ac1 | 516 | |
0f0c8159 JH |
517 | switch (scanent->scancode) |
518 | { | |
519 | case M_FPROTD: /* "f-protd" scanner type -------------------------------- */ | |
b1f8e4f8 | 520 | { |
0f0c8159 JH |
521 | uschar *fp_scan_option; |
522 | unsigned int detected=0, par_count=0; | |
523 | uschar * scanrequest; | |
524 | uschar buf[32768], *strhelper, *strhelper2; | |
525 | uschar * malware_name_internal = NULL; | |
526 | int len; | |
b1f8e4f8 | 527 | |
0f0c8159 | 528 | scanrequest = string_sprintf("GET %s", eml_filename); |
b1f8e4f8 | 529 | |
0f0c8159 JH |
530 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, |
531 | NULL, 0))) | |
532 | { | |
533 | scanrequest = string_sprintf("%s%s%s", scanrequest, | |
534 | par_count ? "%20" : "?", fp_scan_option); | |
535 | par_count++; | |
536 | } | |
537 | scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest); | |
538 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s: %s\n", | |
539 | scanner_name, scanrequest); | |
b1f8e4f8 | 540 | |
0f0c8159 JH |
541 | /* send scan request */ |
542 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
0ea02355 | 543 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 544 | |
0f0c8159 JH |
545 | while ((len = recv_line(sock, buf, sizeof(buf), tmo)) >= 0) |
546 | if (len > 0) | |
547 | { | |
548 | if (Ustrstr(buf, US"<detected type=\"") != NULL) | |
549 | detected = 1; | |
550 | else if (detected && (strhelper = Ustrstr(buf, US"<name>"))) | |
4e71661f | 551 | { |
0f0c8159 | 552 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) |
4e71661f | 553 | { |
0f0c8159 JH |
554 | *strhelper2 = '\0'; |
555 | malware_name_internal = string_copy(strhelper+6); | |
4e71661f JH |
556 | } |
557 | } | |
0f0c8159 | 558 | else if (Ustrstr(buf, US"<summary code=\"")) |
4e71661f | 559 | { |
0f0c8159 JH |
560 | malware_name = Ustrstr(buf, US"<summary code=\"11\">") |
561 | ? malware_name_internal : NULL; | |
562 | break; | |
4e71661f | 563 | } |
0f0c8159 JH |
564 | } |
565 | if (len < -1) | |
566 | { | |
567 | (void)close(sock); | |
568 | return DEFER; | |
569 | } | |
570 | break; | |
571 | } /* f-protd */ | |
b1f8e4f8 | 572 | |
0f0c8159 JH |
573 | case M_DRWEB: /* "drweb" scanner type ----------------------------------- */ |
574 | /* v0.1 - added support for tcp sockets */ | |
575 | /* v0.0 - initial release -- support for unix sockets */ | |
576 | { | |
577 | int result; | |
578 | off_t fsize; | |
579 | unsigned int fsize_uint; | |
580 | uschar * tmpbuf, *drweb_fbuf; | |
581 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
582 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
0f0c8159 JH |
583 | |
584 | /* prepare variables */ | |
585 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
586 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
587 | ||
588 | if (*scanner_options != '/') | |
589 | { | |
590 | /* calc file size */ | |
591 | if ((drweb_fd = open(CCS eml_filename, O_RDONLY)) == -1) | |
0ea02355 | 592 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
593 | string_sprintf("can't open spool file %s: %s", |
594 | eml_filename, strerror(errno)), | |
595 | sock); | |
b1f8e4f8 | 596 | |
0f0c8159 JH |
597 | if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) |
598 | { | |
599 | int err = errno; | |
b1f8e4f8 | 600 | (void)close(drweb_fd); |
0ea02355 | 601 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
602 | string_sprintf("can't seek spool file %s: %s", |
603 | eml_filename, strerror(err)), | |
604 | sock); | |
605 | } | |
606 | fsize_uint = (unsigned int) fsize; | |
607 | if ((off_t)fsize_uint != fsize) | |
608 | { | |
b1f8e4f8 | 609 | (void)close(drweb_fd); |
0ea02355 | 610 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
611 | string_sprintf("seeking spool file %s, size overflow", |
612 | eml_filename), | |
613 | sock); | |
4e71661f | 614 | } |
0f0c8159 JH |
615 | drweb_slen = htonl(fsize); |
616 | lseek(drweb_fd, 0, SEEK_SET); | |
617 | ||
618 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n", | |
619 | scanner_name, scanner_options); | |
620 | ||
621 | /* send scan request */ | |
622 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
623 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
624 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
625 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) | |
4e71661f | 626 | { |
0f0c8159 | 627 | (void)close(drweb_fd); |
0ea02355 | 628 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
629 | "unable to send commands to socket (%s)", scanner_options), |
630 | sock); | |
4e71661f | 631 | } |
8e669ac1 | 632 | |
0f0c8159 JH |
633 | if (!(drweb_fbuf = (uschar *) malloc (fsize_uint))) |
634 | { | |
635 | (void)close(drweb_fd); | |
0ea02355 | 636 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
637 | string_sprintf("unable to allocate memory %u for file (%s)", |
638 | fsize_uint, eml_filename), | |
639 | sock); | |
640 | } | |
b1f8e4f8 | 641 | |
0f0c8159 JH |
642 | if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) |
643 | { | |
644 | int err = errno; | |
645 | (void)close(drweb_fd); | |
646 | free(drweb_fbuf); | |
0ea02355 | 647 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
648 | string_sprintf("can't read spool file %s: %s", |
649 | eml_filename, strerror(err)), | |
650 | sock); | |
651 | } | |
652 | (void)close(drweb_fd); | |
b1f8e4f8 | 653 | |
0f0c8159 JH |
654 | /* send file body to socket */ |
655 | if (send(sock, drweb_fbuf, fsize, 0) < 0) | |
4e71661f | 656 | { |
0f0c8159 | 657 | free(drweb_fbuf); |
0ea02355 | 658 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
659 | "unable to send file body to socket (%s)", scanner_options), |
660 | sock); | |
661 | } | |
0f0c8159 JH |
662 | } |
663 | else | |
664 | { | |
665 | drweb_slen = htonl(Ustrlen(eml_filename)); | |
b1f8e4f8 | 666 | |
0f0c8159 JH |
667 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n", |
668 | scanner_name, scanner_options); | |
b1f8e4f8 | 669 | |
0f0c8159 JH |
670 | /* send scan request */ |
671 | if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
672 | (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
673 | (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
674 | (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || | |
675 | (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) | |
0ea02355 | 676 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
677 | "unable to send commands to socket (%s)", scanner_options), |
678 | sock); | |
679 | } | |
b1f8e4f8 | 680 | |
0f0c8159 JH |
681 | /* wait for result */ |
682 | if (!recv_len(sock, &drweb_rc, sizeof(drweb_rc), tmo)) | |
0ea02355 | 683 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
684 | US"unable to read return code", sock); |
685 | drweb_rc = ntohl(drweb_rc); | |
686 | ||
687 | if (!recv_len(sock, &drweb_vnum, sizeof(drweb_vnum), tmo)) | |
0ea02355 | 688 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
689 | US"unable to read the number of viruses", sock); |
690 | drweb_vnum = ntohl(drweb_vnum); | |
691 | ||
692 | /* "virus(es) found" if virus number is > 0 */ | |
693 | if (drweb_vnum) | |
694 | { | |
695 | int i; | |
b1f8e4f8 | 696 | |
0f0c8159 JH |
697 | /* setup default virus name */ |
698 | malware_name = US"unknown"; | |
b1f8e4f8 | 699 | |
0f0c8159 | 700 | /* set up match regex */ |
476be7e2 JH |
701 | if (!drweb_re) |
702 | drweb_re = m_pcre_compile(drweb_re_str, &errstr); | |
b1f8e4f8 | 703 | |
0f0c8159 JH |
704 | /* read and concatenate virus names into one string */ |
705 | for (i = 0; i < drweb_vnum; i++) | |
4e71661f | 706 | { |
0f0c8159 JH |
707 | int size = 0, off = 0, ovector[10*3]; |
708 | /* read the size of report */ | |
709 | if (!recv_len(sock, &drweb_slen, sizeof(drweb_slen), tmo)) | |
0ea02355 | 710 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
711 | US"cannot read report size", sock); |
712 | drweb_slen = ntohl(drweb_slen); | |
713 | tmpbuf = store_get(drweb_slen); | |
b1f8e4f8 | 714 | |
0f0c8159 JH |
715 | /* read report body */ |
716 | if (!recv_len(sock, tmpbuf, drweb_slen, tmo)) | |
0ea02355 | 717 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
718 | US"cannot read report string", sock); |
719 | tmpbuf[drweb_slen] = '\0'; | |
8544e77a | 720 | |
0f0c8159 JH |
721 | /* try matcher on the line, grab substring */ |
722 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, | |
723 | ovector, nelements(ovector)); | |
724 | if (result >= 2) | |
725 | { | |
726 | const char * pre_malware_nb; | |
8e669ac1 | 727 | |
0f0c8159 | 728 | pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb); |
8e669ac1 | 729 | |
0f0c8159 JH |
730 | if (i==0) /* the first name we just copy to malware_name */ |
731 | malware_name = string_append(NULL, &size, &off, | |
732 | 1, pre_malware_nb); | |
8e669ac1 | 733 | |
0f0c8159 JH |
734 | else /* concatenate each new virus name to previous */ |
735 | malware_name = string_append(malware_name, &size, &off, | |
736 | 2, "/", pre_malware_nb); | |
8e669ac1 | 737 | |
0f0c8159 JH |
738 | pcre_free_substring(pre_malware_nb); |
739 | } | |
740 | } | |
741 | } | |
742 | else | |
743 | { | |
744 | const char *drweb_s = NULL; | |
745 | ||
746 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
747 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
748 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
749 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
750 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
751 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
752 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
753 | * and others are ignored */ | |
754 | if (drweb_s) | |
0ea02355 | 755 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
756 | string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s), |
757 | sock); | |
8e669ac1 | 758 | |
0f0c8159 | 759 | /* no virus found */ |
b1f8e4f8 | 760 | malware_name = NULL; |
0f0c8159 JH |
761 | } |
762 | break; | |
763 | } /* drweb */ | |
8e669ac1 | 764 | |
0f0c8159 JH |
765 | case M_AVES: /* "aveserver" scanner type -------------------------------- */ |
766 | { | |
767 | uschar buf[32768]; | |
768 | int result; | |
8544e77a | 769 | |
0f0c8159 JH |
770 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
771 | buf[0] = 0; | |
772 | recv_line(sock, buf, sizeof(buf), tmo); | |
8544e77a | 773 | |
0f0c8159 | 774 | if (buf[0] != '2') /* aveserver is having problems */ |
0ea02355 | 775 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 | 776 | string_sprintf("unavailable (Responded: %s).", |
b1f8e4f8 | 777 | ((buf[0] != 0) ? buf : (uschar *)"nothing") ), |
0f0c8159 | 778 | sock); |
8e669ac1 | 779 | |
0f0c8159 JH |
780 | /* prepare our command */ |
781 | (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n", | |
782 | eml_filename); | |
783 | ||
784 | /* and send it */ | |
785 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s %s\n", | |
786 | scanner_name, buf); | |
787 | if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0) | |
0ea02355 | 788 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
789 | |
790 | malware_name = NULL; | |
791 | result = 0; | |
792 | /* read response lines, find malware name and final response */ | |
793 | while (recv_line(sock, buf, sizeof(buf), tmo) > 0) | |
794 | { | |
795 | if (buf[0] == '2') | |
796 | break; | |
797 | if (buf[0] == '5') /* aveserver is having problems */ | |
4e71661f | 798 | { |
0ea02355 | 799 | result = m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
800 | string_sprintf("unable to scan file %s (Responded: %s).", |
801 | eml_filename, buf)); | |
802 | break; | |
4e71661f | 803 | } |
0f0c8159 JH |
804 | if (Ustrncmp(buf,"322",3) == 0) |
805 | { | |
806 | uschar *p = Ustrchr(&buf[4], ' '); | |
807 | *p = '\0'; | |
808 | malware_name = string_copy(&buf[4]); | |
809 | } | |
810 | } | |
811 | ||
812 | if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0) | |
0ea02355 | 813 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
814 | |
815 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ | |
816 | buf[0] = 0; | |
817 | recv_line(sock, buf, sizeof(buf), tmo); | |
818 | ||
819 | if (buf[0] != '2') /* aveserver is having problems */ | |
0ea02355 | 820 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
821 | string_sprintf("unable to quit dialogue (Responded: %s).", |
822 | ((buf[0] != 0) ? buf : (uschar *)"nothing") ), | |
823 | sock); | |
824 | ||
825 | if (result == DEFER) | |
826 | { | |
827 | (void)close(sock); | |
828 | return DEFER; | |
829 | } | |
830 | break; | |
b1f8e4f8 | 831 | } /* aveserver */ |
8e669ac1 | 832 | |
b1f8e4f8 JH |
833 | case M_FSEC: /* "fsecure" scanner type ---------------------------------- */ |
834 | { | |
0f0c8159 JH |
835 | int i, j, bread = 0; |
836 | uschar * file_name; | |
837 | uschar av_buffer[1024]; | |
0f0c8159 JH |
838 | static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n", |
839 | US"CONFIGURE\tTIMEOUT\t0\n", | |
840 | US"CONFIGURE\tMAXARCH\t5\n", | |
841 | US"CONFIGURE\tMIME\t1\n" }; | |
842 | ||
843 | malware_name = NULL; | |
844 | ||
845 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
846 | scanner_name, scanner_options); | |
847 | /* pass options */ | |
848 | memset(av_buffer, 0, sizeof(av_buffer)); | |
849 | for (i = 0; i != nelements(cmdopt); i++) | |
850 | { | |
b1f8e4f8 | 851 | |
0f0c8159 | 852 | if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0) |
0ea02355 | 853 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 854 | |
0f0c8159 JH |
855 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); |
856 | if (bread > 0) av_buffer[bread]='\0'; | |
857 | if (bread < 0) | |
0ea02355 | 858 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
859 | string_sprintf("unable to read answer %d (%s)", i, strerror(errno)), |
860 | sock); | |
861 | for (j = 0; j < bread; j++) | |
862 | if (av_buffer[j] == '\r' || av_buffer[j] == '\n') | |
863 | av_buffer[j] ='@'; | |
864 | } | |
8e669ac1 | 865 | |
0f0c8159 JH |
866 | /* pass the mailfile to fsecure */ |
867 | file_name = string_sprintf("SCAN\t%s\n", eml_filename); | |
b1f8e4f8 | 868 | |
0f0c8159 | 869 | if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0) |
0ea02355 | 870 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 871 | |
0f0c8159 JH |
872 | /* set up match */ |
873 | /* todo also SUSPICION\t */ | |
476be7e2 JH |
874 | if (!fsec_re) |
875 | fsec_re = m_pcre_compile(fsec_re_str, &errstr); | |
b1f8e4f8 | 876 | |
0f0c8159 JH |
877 | /* read report, linewise. Apply a timeout as the Fsecure daemon |
878 | sometimes wants an answer to "PING" but they won't tell us what */ | |
fd02dc0e | 879 | { |
0f0c8159 JH |
880 | uschar * p = av_buffer; |
881 | uschar * q; | |
fd02dc0e | 882 | |
0f0c8159 JH |
883 | for (;;) |
884 | { | |
80591636 | 885 | errno = ETIMEDOUT; |
0f0c8159 JH |
886 | i = av_buffer+sizeof(av_buffer)-p; |
887 | if ((bread= ip_recv(sock, p, i-1, tmo-time(NULL))) < 0) | |
0ea02355 | 888 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
889 | string_sprintf("unable to read result (%s)", strerror(errno)), |
890 | sock); | |
b1f8e4f8 | 891 | |
755762fd | 892 | for (p[bread] = '\0'; (q = Ustrchr(p, '\n')); p = q+1) |
0f0c8159 JH |
893 | { |
894 | *q = '\0'; | |
fd02dc0e | 895 | |
0f0c8159 JH |
896 | /* Really search for virus again? */ |
897 | if (!malware_name) | |
898 | /* try matcher on the line, grab substring */ | |
476be7e2 | 899 | malware_name = m_pcre_exec(fsec_re, p); |
fd02dc0e | 900 | |
0f0c8159 JH |
901 | if (Ustrstr(p, "OK\tScan ok.")) |
902 | goto fsec_found; | |
903 | } | |
fd02dc0e | 904 | |
0f0c8159 JH |
905 | /* copy down the trailing partial line then read another chunk */ |
906 | i = av_buffer+sizeof(av_buffer)-p; | |
907 | memmove(av_buffer, p, i); | |
908 | p = av_buffer+i; | |
fd02dc0e | 909 | } |
b1f8e4f8 | 910 | } |
fd02dc0e JH |
911 | |
912 | fsec_found: | |
b1f8e4f8 JH |
913 | break; |
914 | } /* fsecure */ | |
599dcb77 | 915 | |
b1f8e4f8 JH |
916 | case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */ |
917 | { | |
0f0c8159 JH |
918 | time_t t; |
919 | uschar tmpbuf[1024]; | |
920 | uschar * scanrequest; | |
921 | int kav_rc; | |
2decbec9 RC |
922 | unsigned long kav_reportlen; |
923 | int bread; | |
0f0c8159 JH |
924 | const pcre *kav_re; |
925 | uschar *p; | |
926 | ||
927 | /* get current date and time, build scan request */ | |
928 | time(&t); | |
929 | /* pdp note: before the eml_filename parameter, this scanned the | |
930 | directory; not finding documentation, so we'll strip off the directory. | |
931 | The side-effect is that the test framework scanning may end up in | |
932 | scanning more than was requested, but for the normal interface, this is | |
933 | fine. */ | |
934 | ||
935 | strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t)); | |
936 | scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename); | |
937 | p = Ustrrchr(scanrequest, '/'); | |
938 | if (p) | |
939 | *p = '\0'; | |
940 | ||
941 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", | |
942 | scanner_name, scanner_options); | |
943 | ||
944 | /* send scan request */ | |
945 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
0ea02355 | 946 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 947 | |
0f0c8159 JH |
948 | /* wait for result */ |
949 | if (!recv_len(sock, tmpbuf, 2, tmo)) | |
0ea02355 | 950 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 | 951 | US"unable to read 2 bytes from socket.", sock); |
b1f8e4f8 | 952 | |
0f0c8159 JH |
953 | /* get errorcode from one nibble */ |
954 | kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F; | |
955 | switch(kav_rc) | |
956 | { | |
957 | case 5: case 6: /* improper kavdaemon configuration */ | |
0ea02355 | 958 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
959 | US"please reconfigure kavdaemon to NOT disinfect or remove infected files.", |
960 | sock); | |
961 | case 1: | |
0ea02355 | 962 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
963 | US"reported 'scanning not completed' (code 1).", sock); |
964 | case 7: | |
0ea02355 | 965 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
966 | US"reported 'kavdaemon damaged' (code 7).", sock); |
967 | } | |
b1f8e4f8 | 968 | |
0f0c8159 JH |
969 | /* code 8 is not handled, since it is ambigous. It appears mostly on |
970 | bounces where part of a file has been cut off */ | |
b1f8e4f8 | 971 | |
0f0c8159 JH |
972 | /* "virus found" return codes (2-4) */ |
973 | if (kav_rc > 1 && kav_rc < 5) | |
b1f8e4f8 | 974 | { |
0f0c8159 | 975 | int report_flag = 0; |
599dcb77 | 976 | |
0f0c8159 JH |
977 | /* setup default virus name */ |
978 | malware_name = US"unknown"; | |
b1f8e4f8 | 979 | |
0f0c8159 | 980 | report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ]; |
b1f8e4f8 | 981 | |
0f0c8159 JH |
982 | /* read the report, if available */ |
983 | if (report_flag == 1) | |
984 | { | |
985 | /* read report size */ | |
986 | if (!recv_len(sock, &kav_reportlen, 4, tmo)) | |
0ea02355 | 987 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 | 988 | US"cannot read report size", sock); |
b1f8e4f8 | 989 | |
0f0c8159 JH |
990 | /* it's possible that avp returns av_buffer[1] == 1 but the |
991 | reportsize is 0 (!?) */ | |
992 | if (kav_reportlen > 0) | |
4e71661f | 993 | { |
0f0c8159 | 994 | /* set up match regex, depends on retcode */ |
476be7e2 JH |
995 | if (kav_rc == 3) |
996 | { | |
997 | if (!kav_re_sus) kav_re_sus = m_pcre_compile(kav_re_sus_str, &errstr); | |
998 | kav_re = kav_re_sus; | |
999 | } | |
1000 | else | |
1001 | { | |
1002 | if (!kav_re_inf) kav_re_inf = m_pcre_compile(kav_re_inf_str, &errstr); | |
1003 | kav_re = kav_re_inf; | |
1004 | } | |
0f0c8159 JH |
1005 | |
1006 | /* read report, linewise */ | |
1007 | while (kav_reportlen > 0) | |
4e71661f | 1008 | { |
0f0c8159 JH |
1009 | if ((bread = recv_line(sock, tmpbuf, sizeof(tmpbuf), tmo)) < 0) |
1010 | break; | |
1011 | kav_reportlen -= bread+1; | |
1012 | ||
1013 | /* try matcher on the line, grab substring */ | |
1014 | if ((malware_name = m_pcre_exec(kav_re, tmpbuf))) | |
1015 | break; | |
b1f8e4f8 JH |
1016 | } |
1017 | } | |
1018 | } | |
0f0c8159 JH |
1019 | } |
1020 | else /* no virus found */ | |
1021 | malware_name = NULL; | |
599dcb77 | 1022 | |
0f0c8159 | 1023 | break; |
599dcb77 | 1024 | } |
8544e77a | 1025 | |
b1f8e4f8 JH |
1026 | case M_CMDL: /* "cmdline" scanner type ---------------------------------- */ |
1027 | { | |
0f0c8159 JH |
1028 | const uschar *cmdline_scanner = scanner_options; |
1029 | const pcre *cmdline_trigger_re; | |
1030 | const pcre *cmdline_regex_re; | |
1031 | uschar * file_name; | |
1032 | uschar * commandline; | |
1033 | void (*eximsigchld)(int); | |
1034 | void (*eximsigpipe)(int); | |
1035 | FILE *scanner_out = NULL; | |
1036 | int scanner_fd; | |
1037 | FILE *scanner_record = NULL; | |
1038 | uschar linebuffer[32767]; | |
1039 | int rcnt; | |
1040 | int trigger = 0; | |
1041 | uschar *p; | |
1042 | ||
1043 | if (!cmdline_scanner) | |
0ea02355 | 1044 | return m_errlog_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1045 | |
0f0c8159 JH |
1046 | /* find scanner output trigger */ |
1047 | cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1048 | "missing trigger specification", &errstr); | |
1049 | if (!cmdline_trigger_re) | |
0ea02355 | 1050 | return m_errlog_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1051 | |
0f0c8159 JH |
1052 | /* find scanner name regex */ |
1053 | cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1054 | "missing virus name regex specification", &errstr); | |
1055 | if (!cmdline_regex_re) | |
0ea02355 | 1056 | return m_errlog_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1057 | |
0f0c8159 JH |
1058 | /* prepare scanner call; despite the naming, file_name holds a directory |
1059 | name which is documented as the value given to %s. */ | |
b1f8e4f8 | 1060 | |
0f0c8159 JH |
1061 | file_name = string_copy(eml_filename); |
1062 | p = Ustrrchr(file_name, '/'); | |
1063 | if (p) | |
1064 | *p = '\0'; | |
1065 | commandline = string_sprintf(CS cmdline_scanner, file_name); | |
b1f8e4f8 | 1066 | |
0f0c8159 JH |
1067 | /* redirect STDERR too */ |
1068 | commandline = string_sprintf("%s 2>&1", commandline); | |
b1f8e4f8 | 1069 | |
0f0c8159 JH |
1070 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
1071 | scanner_name, commandline); | |
b1f8e4f8 | 1072 | |
0f0c8159 JH |
1073 | /* store exims signal handlers */ |
1074 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1075 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
b1f8e4f8 | 1076 | |
0f0c8159 JH |
1077 | if (!(scanner_out = popen(CS commandline,"r"))) |
1078 | { | |
1079 | int err = errno; | |
1080 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1081 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1082 | string_sprintf("call (%s) failed: %s.", commandline, strerror(err))); |
1083 | } | |
1084 | scanner_fd = fileno(scanner_out); | |
94a18f28 | 1085 | |
0f0c8159 JH |
1086 | file_name = string_sprintf("%s/scan/%s/%s_scanner_output", |
1087 | spool_directory, message_id, message_id); | |
b1f8e4f8 | 1088 | |
0f0c8159 JH |
1089 | if (!(scanner_record = modefopen(file_name, "wb", SPOOL_MODE))) |
1090 | { | |
1091 | int err = errno; | |
1092 | (void) pclose(scanner_out); | |
1093 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1094 | return m_errlog_defer(scanent, NULL, string_sprintf( |
0f0c8159 JH |
1095 | "opening scanner output file (%s) failed: %s.", |
1096 | file_name, strerror(err))); | |
1097 | } | |
8e669ac1 | 1098 | |
0f0c8159 JH |
1099 | /* look for trigger while recording output */ |
1100 | while ((rcnt = recv_line(scanner_fd, linebuffer, | |
1101 | sizeof(linebuffer), tmo))) | |
1102 | { | |
1103 | if (rcnt < 0) | |
93a6fce2 JH |
1104 | { |
1105 | int err = errno; | |
0f0c8159 JH |
1106 | if (rcnt == -1) |
1107 | break; | |
93a6fce2 JH |
1108 | (void) pclose(scanner_out); |
1109 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1110 | return m_errlog_defer(scanent, NULL, string_sprintf( |
93a6fce2 JH |
1111 | "unable to read from scanner (%s): %s", |
1112 | commandline, strerror(err))); | |
1113 | } | |
4e71661f | 1114 | |
0f0c8159 JH |
1115 | if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record)) |
1116 | { | |
1117 | /* short write */ | |
1118 | (void) pclose(scanner_out); | |
1119 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1120 | return m_errlog_defer(scanent, NULL, string_sprintf( |
0f0c8159 | 1121 | "short write on scanner output file (%s).", file_name)); |
4e71661f | 1122 | } |
0f0c8159 JH |
1123 | putc('\n', scanner_record); |
1124 | /* try trigger match */ | |
1125 | if ( !trigger | |
1126 | && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1) | |
1127 | ) | |
1128 | trigger = 1; | |
1129 | } | |
8e669ac1 | 1130 | |
0f0c8159 JH |
1131 | (void)fclose(scanner_record); |
1132 | sep = pclose(scanner_out); | |
1133 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1134 | if (sep != 0) | |
0ea02355 | 1135 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1136 | sep == -1 |
1137 | ? string_sprintf("running scanner failed: %s", strerror(sep)) | |
1138 | : string_sprintf("scanner returned error code: %d", sep)); | |
b1f8e4f8 | 1139 | |
0f0c8159 JH |
1140 | if (trigger) |
1141 | { | |
1142 | uschar * s; | |
1143 | /* setup default virus name */ | |
1144 | malware_name = US"unknown"; | |
b1f8e4f8 | 1145 | |
0f0c8159 JH |
1146 | /* re-open the scanner output file, look for name match */ |
1147 | scanner_record = fopen(CS file_name, "rb"); | |
1148 | while (fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) | |
1149 | { | |
1150 | /* try match */ | |
1151 | if ((s = m_pcre_exec(cmdline_regex_re, linebuffer))) | |
1152 | malware_name = s; | |
4e71661f | 1153 | } |
0f0c8159 JH |
1154 | (void)fclose(scanner_record); |
1155 | } | |
1156 | else /* no virus found */ | |
1157 | malware_name = NULL; | |
1158 | break; | |
b1f8e4f8 | 1159 | } /* cmdline */ |
599dcb77 | 1160 | |
b1f8e4f8 JH |
1161 | case M_SOPHIE: /* "sophie" scanner type --------------------------------- */ |
1162 | { | |
0f0c8159 JH |
1163 | int bread = 0; |
1164 | uschar *p; | |
1165 | uschar * file_name; | |
1166 | uschar av_buffer[1024]; | |
b1f8e4f8 | 1167 | |
0f0c8159 JH |
1168 | /* pass the scan directory to sophie */ |
1169 | file_name = string_copy(eml_filename); | |
1170 | if ((p = Ustrrchr(file_name, '/'))) | |
1171 | *p = '\0'; | |
b1f8e4f8 | 1172 | |
0f0c8159 JH |
1173 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", |
1174 | scanner_name, scanner_options); | |
b1f8e4f8 | 1175 | |
0f0c8159 JH |
1176 | if ( write(sock, file_name, Ustrlen(file_name)) < 0 |
1177 | || write(sock, "\n", 1) != 1 | |
1178 | ) | |
0ea02355 | 1179 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1180 | string_sprintf("unable to write to UNIX socket (%s)", scanner_options), |
1181 | sock); | |
b1f8e4f8 | 1182 | |
0f0c8159 JH |
1183 | /* wait for result */ |
1184 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1185 | if ((bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL))) <= 0) | |
0ea02355 | 1186 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1187 | string_sprintf("unable to read from UNIX socket (%s)", scanner_options), |
1188 | sock); | |
1189 | ||
1190 | /* infected ? */ | |
1191 | if (av_buffer[0] == '1') { | |
1192 | uschar * s = Ustrchr(av_buffer, '\n'); | |
1193 | if (s) | |
1194 | *s = '\0'; | |
1195 | malware_name = string_copy(&av_buffer[2]); | |
1196 | } | |
1197 | else if (!strncmp(CS av_buffer, "-1", 2)) | |
0ea02355 JH |
1198 | return m_errlog_defer_3(scanent, CUS callout_address, |
1199 | US"scanner reported error", sock); | |
0f0c8159 JH |
1200 | else /* all ok, no virus */ |
1201 | malware_name = NULL; | |
599dcb77 | 1202 | |
0f0c8159 | 1203 | break; |
8544e77a | 1204 | } |
8e669ac1 | 1205 | |
b1f8e4f8 JH |
1206 | case M_CLAMD: /* "clamd" scanner type ----------------------------------- */ |
1207 | { | |
0f0c8159 JH |
1208 | /* This code was originally contributed by David Saez */ |
1209 | /* There are three scanning methods available to us: | |
1210 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1211 | * (2) Use the STREAM command, send the data on a separate port | |
1212 | * (3) Use the zINSTREAM command, send the data inline | |
1213 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1214 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1215 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
1216 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless | |
1217 | * WITH_OLD_CLAMAV_STREAM is defined. | |
1218 | * See Exim bug 926 for details. */ | |
1219 | ||
80591636 | 1220 | uschar *p, *vname, *result_tag; |
0f0c8159 JH |
1221 | int bread=0; |
1222 | uschar * file_name; | |
1223 | uschar av_buffer[1024]; | |
1224 | uschar *hostname = US""; | |
1225 | host_item connhost; | |
1226 | uschar *clamav_fbuf; | |
1227 | int clam_fd, result; | |
1228 | off_t fsize; | |
1229 | unsigned int fsize_uint; | |
1230 | BOOL use_scan_command = FALSE; | |
8a512ed5 | 1231 | clamd_address * cv[MAX_CLAMD_SERVERS]; |
0f0c8159 JH |
1232 | int num_servers = 0; |
1233 | #ifdef WITH_OLD_CLAMAV_STREAM | |
1234 | unsigned int port; | |
1235 | uschar av_buffer2[1024]; | |
1236 | int sockData; | |
1237 | #else | |
1238 | uint32_t send_size, send_final_zeroblock; | |
1239 | #endif | |
1240 | ||
8a512ed5 JH |
1241 | /*XXX if unixdomain socket, only one server supported. Needs fixing; |
1242 | there's no reason we should not mix local and remote servers */ | |
1243 | ||
0f0c8159 | 1244 | if (*scanner_options == '/') |
8a512ed5 JH |
1245 | { |
1246 | clamd_address * cd; | |
1247 | const uschar * sublist; | |
1248 | int subsep = ' '; | |
1249 | ||
0f0c8159 JH |
1250 | /* Local file; so we def want to use_scan_command and don't want to try |
1251 | * passing IP/port combinations */ | |
1252 | use_scan_command = TRUE; | |
8a512ed5 JH |
1253 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
1254 | ||
1255 | /* extract socket-path part */ | |
1256 | sublist = scanner_options; | |
1257 | cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0); | |
1258 | ||
1259 | /* parse options */ | |
1260 | if (clamd_option(cd, sublist, &subsep) != OK) | |
0ea02355 | 1261 | return m_errlog_defer(scanent, NULL, |
8a512ed5 JH |
1262 | string_sprintf("bad option '%s'", scanner_options)); |
1263 | cv[0] = cd; | |
1264 | } | |
0f0c8159 JH |
1265 | else |
1266 | { | |
0f0c8159 JH |
1267 | /* Go through the rest of the list of host/port and construct an array |
1268 | * of servers to try. The first one is the bit we just passed from | |
1269 | * scanner_options so process that first and then scan the remainder of | |
1270 | * the address buffer */ | |
1271 | do | |
4e71661f | 1272 | { |
8a512ed5 JH |
1273 | clamd_address * cd; |
1274 | const uschar * sublist; | |
1275 | int subsep = ' '; | |
1276 | uschar * s; | |
b1f8e4f8 | 1277 | |
0f0c8159 JH |
1278 | /* The 'local' option means use the SCAN command over the network |
1279 | * socket (ie common file storage in use) */ | |
8a512ed5 JH |
1280 | /*XXX we could accept this also as a local option? */ |
1281 | if (strcmpic(scanner_options, US"local") == 0) | |
0f0c8159 JH |
1282 | { |
1283 | use_scan_command = TRUE; | |
1284 | continue; | |
1285 | } | |
b1f8e4f8 | 1286 | |
8a512ed5 | 1287 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
b1f8e4f8 | 1288 | |
0f0c8159 | 1289 | /* extract host and port part */ |
8a512ed5 JH |
1290 | sublist = scanner_options; |
1291 | if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
1292 | { | |
0ea02355 | 1293 | (void) m_errlog_defer(scanent, NULL, |
8a512ed5 JH |
1294 | string_sprintf("missing address: '%s'", scanner_options)); |
1295 | continue; | |
1296 | } | |
1297 | if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
0f0c8159 | 1298 | { |
0ea02355 | 1299 | (void) m_errlog_defer(scanent, NULL, |
8a512ed5 JH |
1300 | string_sprintf("missing port: '%s'", scanner_options)); |
1301 | continue; | |
1302 | } | |
93a6fce2 | 1303 | cd->tcp_port = atoi(CS s); |
8a512ed5 JH |
1304 | |
1305 | /* parse options */ | |
1306 | /*XXX should these options be common over scanner types? */ | |
1307 | if (clamd_option(cd, sublist, &subsep) != OK) | |
0ea02355 | 1308 | return m_errlog_defer(scanent, NULL, |
8a512ed5 | 1309 | string_sprintf("bad option '%s'", scanner_options)); |
b1f8e4f8 | 1310 | |
8a512ed5 | 1311 | cv[num_servers++] = cd; |
0f0c8159 JH |
1312 | if (num_servers >= MAX_CLAMD_SERVERS) |
1313 | { | |
0ea02355 | 1314 | (void) m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1315 | US"More than " MAX_CLAMD_SERVERS_S " clamd servers " |
1316 | "specified; only using the first " MAX_CLAMD_SERVERS_S ); | |
1317 | break; | |
1318 | } | |
8a512ed5 JH |
1319 | } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep, |
1320 | NULL, 0))); | |
8e669ac1 | 1321 | |
0f0c8159 JH |
1322 | /* check if we have at least one server */ |
1323 | if (!num_servers) | |
0ea02355 | 1324 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1325 | US"no useable server addresses in malware configuration option."); |
1326 | } | |
b1f8e4f8 | 1327 | |
0f0c8159 JH |
1328 | /* See the discussion of response formats below to see why we really |
1329 | don't like colons in filenames when passing filenames to ClamAV. */ | |
1330 | if (use_scan_command && Ustrchr(eml_filename, ':')) | |
0ea02355 | 1331 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1332 | string_sprintf("local/SCAN mode incompatible with" \ |
1333 | " : in path to email filename [%s]", eml_filename)); | |
b1f8e4f8 | 1334 | |
0f0c8159 JH |
1335 | /* We have some network servers specified */ |
1336 | if (num_servers) | |
1337 | { | |
1338 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd | |
1339 | * only supports AF_INET, but we should probably be looking to the | |
1340 | * future and rewriting this to be protocol-independent anyway. */ | |
b1f8e4f8 | 1341 | |
0f0c8159 JH |
1342 | while (num_servers > 0) |
1343 | { | |
8a512ed5 JH |
1344 | int i = random_number( num_servers ); |
1345 | clamd_address * cd = cv[i]; | |
b1f8e4f8 | 1346 | |
8a512ed5 JH |
1347 | DEBUG(D_acl) debug_printf("trying server name %s, port %u\n", |
1348 | cd->hostspec, cd->tcp_port); | |
0f0c8159 JH |
1349 | |
1350 | /* Lookup the host. This is to ensure that we connect to the same IP | |
1351 | * on both connections (as one host could resolve to multiple ips) */ | |
8a512ed5 | 1352 | for (;;) |
0f0c8159 | 1353 | { |
8a512ed5 JH |
1354 | sock= m_tcpsocket(cd->hostspec, cd->tcp_port, &connhost, &errstr); |
1355 | if (sock >= 0) | |
1356 | { | |
1357 | /* Connection successfully established with a server */ | |
1358 | hostname = cd->hostspec; | |
1359 | break; | |
1360 | } | |
1361 | if (cd->retry <= 0) break; | |
1362 | while (cd->retry > 0) cd->retry = sleep(cd->retry); | |
4e71661f | 1363 | } |
8a512ed5 JH |
1364 | if (sock >= 0) |
1365 | break; | |
b1f8e4f8 | 1366 | |
0ea02355 | 1367 | (void) m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1368 | |
1369 | /* Remove the server from the list. XXX We should free the memory */ | |
1370 | num_servers--; | |
8a512ed5 JH |
1371 | for (; i < num_servers; i++) |
1372 | cv[i] = cv[i+1]; | |
4e71661f | 1373 | } |
8e669ac1 | 1374 | |
0f0c8159 | 1375 | if (num_servers == 0) |
0ea02355 | 1376 | return m_errlog_defer(scanent, NULL, US"all servers failed"); |
0f0c8159 JH |
1377 | } |
1378 | else | |
8a512ed5 JH |
1379 | for (;;) |
1380 | { | |
1381 | if ((sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0) | |
1382 | { | |
1383 | hostname = cv[0]->hostspec; | |
1384 | break; | |
1385 | } | |
1386 | if (cv[0]->retry <= 0) | |
0ea02355 | 1387 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
8a512ed5 JH |
1388 | while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry); |
1389 | } | |
b1f8e4f8 | 1390 | |
0f0c8159 JH |
1391 | /* have socket in variable "sock"; command to use is semi-independent of |
1392 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1393 | * domain socket, or explicitly told local) else we stream the data. | |
1394 | * How we stream the data depends upon how we were built. */ | |
1395 | ||
1396 | if (!use_scan_command) | |
1397 | { | |
4e71661f | 1398 | #ifdef WITH_OLD_CLAMAV_STREAM |
0f0c8159 JH |
1399 | /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to |
1400 | * that port on a second connection; then in the scan-method-neutral | |
1401 | * part, read the response back on the original connection. */ | |
b1f8e4f8 | 1402 | |
0f0c8159 JH |
1403 | DEBUG(D_acl) debug_printf( |
1404 | "Malware scan: issuing %s old-style remote scan (PORT)\n", | |
1405 | scanner_name); | |
b1f8e4f8 | 1406 | |
0f0c8159 JH |
1407 | /* Pass the string to ClamAV (7 = "STREAM\n") */ |
1408 | if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0) | |
0ea02355 | 1409 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1410 | |
0f0c8159 JH |
1411 | memset(av_buffer2, 0, sizeof(av_buffer2)); |
1412 | bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), tmo-time(NULL)); | |
b1f8e4f8 | 1413 | |
0f0c8159 | 1414 | if (bread < 0) |
0ea02355 | 1415 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1416 | string_sprintf("unable to read PORT from socket (%s)", |
1417 | strerror(errno)), | |
1418 | sock); | |
b1f8e4f8 | 1419 | |
0f0c8159 | 1420 | if (bread == sizeof(av_buffer2)) |
0ea02355 JH |
1421 | return m_errlog_defer_3(scanent, CUS callout_address, |
1422 | "buffer too small", sock); | |
b1f8e4f8 | 1423 | |
0f0c8159 | 1424 | if (!(*av_buffer2)) |
0ea02355 JH |
1425 | return m_errlog_defer_3(scanent, CUS callout_address, |
1426 | "ClamAV returned null", sock); | |
b1f8e4f8 | 1427 | |
0f0c8159 JH |
1428 | av_buffer2[bread] = '\0'; |
1429 | if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) | |
0ea02355 | 1430 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1431 | string_sprintf("Expected port information from clamd, got '%s'", |
1432 | av_buffer2), | |
1433 | sock); | |
b1f8e4f8 | 1434 | |
0f0c8159 JH |
1435 | sockData = m_tcpsocket(connhost.address, port, NULL, &errstr); |
1436 | if (sockData < 0) | |
0ea02355 | 1437 | return m_errlog_defer_3(scanent, CUS callout_address, errstr, sock); |
b1f8e4f8 | 1438 | |
4e71661f JH |
1439 | # define CLOSE_SOCKDATA (void)close(sockData) |
1440 | #else /* WITH_OLD_CLAMAV_STREAM not defined */ | |
0f0c8159 JH |
1441 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> |
1442 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1443 | chunk. */ | |
b1f8e4f8 | 1444 | |
0f0c8159 JH |
1445 | DEBUG(D_acl) debug_printf( |
1446 | "Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", | |
1447 | scanner_name); | |
b1f8e4f8 | 1448 | |
0f0c8159 JH |
1449 | /* Pass the string to ClamAV (10 = "zINSTREAM\0") */ |
1450 | if (send(sock, "zINSTREAM", 10, 0) < 0) | |
0ea02355 | 1451 | return m_errlog_defer_3(scanent, CUS hostname, |
0f0c8159 JH |
1452 | string_sprintf("unable to send zINSTREAM to socket (%s)", |
1453 | strerror(errno)), | |
1454 | sock); | |
b1f8e4f8 | 1455 | |
4e71661f JH |
1456 | # define CLOSE_SOCKDATA /**/ |
1457 | #endif | |
b1f8e4f8 | 1458 | |
0f0c8159 JH |
1459 | /* calc file size */ |
1460 | if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) | |
1461 | { | |
1462 | int err = errno; | |
1463 | CLOSE_SOCKDATA; | |
0ea02355 | 1464 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1465 | string_sprintf("can't open spool file %s: %s", |
1466 | eml_filename, strerror(err)), | |
1467 | sock); | |
1468 | } | |
1469 | if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) | |
1470 | { | |
1471 | int err = errno; | |
1472 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
0ea02355 | 1473 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1474 | string_sprintf("can't seek spool file %s: %s", |
1475 | eml_filename, strerror(err)), | |
1476 | sock); | |
1477 | } | |
1478 | fsize_uint = (unsigned int) fsize; | |
1479 | if ((off_t)fsize_uint != fsize) | |
1480 | { | |
1481 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
0ea02355 | 1482 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1483 | string_sprintf("seeking spool file %s, size overflow", |
1484 | eml_filename), | |
1485 | sock); | |
1486 | } | |
1487 | lseek(clam_fd, 0, SEEK_SET); | |
b1f8e4f8 | 1488 | |
0f0c8159 JH |
1489 | if (!(clamav_fbuf = (uschar *) malloc (fsize_uint))) |
1490 | { | |
1491 | CLOSE_SOCKDATA; (void)close(clam_fd); | |
0ea02355 | 1492 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1493 | string_sprintf("unable to allocate memory %u for file (%s)", |
1494 | fsize_uint, eml_filename), | |
1495 | sock); | |
1496 | } | |
b1f8e4f8 | 1497 | |
0f0c8159 JH |
1498 | if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0) |
1499 | { | |
1500 | int err = errno; | |
1501 | free(clamav_fbuf); CLOSE_SOCKDATA; (void)close(clam_fd); | |
0ea02355 | 1502 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1503 | string_sprintf("can't read spool file %s: %s", |
1504 | eml_filename, strerror(err)), | |
1505 | sock); | |
1506 | } | |
1507 | (void)close(clam_fd); | |
b1f8e4f8 | 1508 | |
0f0c8159 | 1509 | /* send file body to socket */ |
4e71661f | 1510 | #ifdef WITH_OLD_CLAMAV_STREAM |
0f0c8159 JH |
1511 | if (send(sockData, clamav_fbuf, fsize_uint, 0) < 0) |
1512 | { | |
1513 | free(clamav_fbuf); CLOSE_SOCKDATA; | |
0ea02355 | 1514 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1515 | string_sprintf("unable to send file body to socket (%s:%u)", |
1516 | hostname, port), | |
1517 | sock); | |
1518 | } | |
4e71661f | 1519 | #else |
0f0c8159 JH |
1520 | send_size = htonl(fsize_uint); |
1521 | send_final_zeroblock = 0; | |
1522 | if ((send(sock, &send_size, sizeof(send_size), 0) < 0) || | |
1523 | (send(sock, clamav_fbuf, fsize_uint, 0) < 0) || | |
1524 | (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
1525 | { | |
b1f8e4f8 | 1526 | free(clamav_fbuf); |
0ea02355 | 1527 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1528 | string_sprintf("unable to send file body to socket (%s)", hostname), |
1529 | sock); | |
4e71661f | 1530 | } |
0f0c8159 | 1531 | #endif |
b1f8e4f8 | 1532 | |
0f0c8159 | 1533 | free(clamav_fbuf); |
b1f8e4f8 | 1534 | |
0f0c8159 JH |
1535 | CLOSE_SOCKDATA; |
1536 | #undef CLOSE_SOCKDATA | |
1537 | } | |
1538 | else | |
1539 | { /* use scan command */ | |
1540 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1541 | * scan-method-neutral part, read the response back */ | |
1542 | ||
1543 | /* ================================================================= */ | |
1544 | ||
1545 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1546 | which dates to when ClamAV needed us to break apart the email into the | |
1547 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1548 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1549 | doing this would actually have resulted in the mail attachments being | |
1550 | scanned twice, in the broken out files and from the original .eml. | |
1551 | Since ClamAV now handles emails (and has for quite some time) we can | |
1552 | just use the email file itself. */ | |
1553 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */ | |
1554 | file_name = string_sprintf("SCAN %s\n", eml_filename); | |
1555 | ||
1556 | DEBUG(D_acl) debug_printf( | |
1557 | "Malware scan: issuing %s local-path scan [%s]\n", | |
1558 | scanner_name, scanner_options); | |
b1f8e4f8 | 1559 | |
0f0c8159 | 1560 | if (send(sock, file_name, Ustrlen(file_name), 0) < 0) |
0ea02355 | 1561 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1562 | string_sprintf("unable to write to socket (%s)", strerror(errno)), |
1563 | sock); | |
b1f8e4f8 | 1564 | |
0f0c8159 JH |
1565 | /* Do not shut down the socket for writing; a user report noted that |
1566 | * clamd 0.70 does not react well to this. */ | |
1567 | } | |
1568 | /* Commands have been sent, no matter which scan method or connection | |
1569 | * type we're using; now just read the result, independent of method. */ | |
1570 | ||
1571 | /* Read the result */ | |
1572 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1573 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
1574 | (void)close(sock); | |
1575 | sock = -1; | |
1576 | ||
1577 | if (bread <= 0) | |
0ea02355 | 1578 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1579 | string_sprintf("unable to read from socket (%s)", |
1580 | errno == 0 ? "EOF" : strerror(errno))); | |
1581 | ||
1582 | if (bread == sizeof(av_buffer)) | |
0ea02355 JH |
1583 | return m_errlog_defer(scanent, CUS callout_address, |
1584 | US"buffer too small"); | |
0f0c8159 JH |
1585 | /* We're now assured of a NULL at the end of av_buffer */ |
1586 | ||
1587 | /* Check the result. ClamAV returns one of two result formats. | |
1588 | In the basic mode, the response is of the form: | |
1589 | infected: -> "<filename>: <virusname> FOUND" | |
1590 | not-infected: -> "<filename>: OK" | |
1591 | error: -> "<filename>: <errcode> ERROR | |
1592 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1593 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1594 | for the infected case. Compare: | |
1595 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1596 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1597 | ||
1598 | In the streaming case, clamd uses the filename "stream" which you should | |
1599 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1600 | client app will replace "stream" with the original filename before returning | |
1601 | results to stdout, but the trace shows the data). | |
1602 | ||
1603 | We will assume that the pathname passed to clamd from Exim does not contain | |
1604 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1605 | passing a filename to clamd). */ | |
1606 | ||
1607 | if (!(*av_buffer)) | |
0ea02355 JH |
1608 | return m_errlog_defer(scanent, CUS callout_address, |
1609 | US"ClamAV returned null"); | |
0f0c8159 JH |
1610 | |
1611 | /* strip newline at the end (won't be present for zINSTREAM) | |
1612 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1613 | this below, so double-check) */ | |
1614 | p = av_buffer + Ustrlen(av_buffer) - 1; | |
1615 | if (*p == '\n') *p = '\0'; | |
1616 | ||
1617 | DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer); | |
1618 | ||
1619 | while (isspace(*--p) && (p > av_buffer)) | |
1620 | *p = '\0'; | |
1621 | if (*p) ++p; | |
0f0c8159 JH |
1622 | |
1623 | /* colon in returned output? */ | |
80591636 | 1624 | if(!(p = Ustrchr(av_buffer,':'))) |
0ea02355 | 1625 | return m_errlog_defer(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
1626 | "ClamAV returned malformed result (missing colon): %s", |
1627 | av_buffer)); | |
1628 | ||
1629 | /* strip filename */ | |
1630 | while (*p && isspace(*++p)) /**/; | |
1631 | vname = p; | |
1632 | ||
1633 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1634 | but we should at least be resistant to it. */ | |
1635 | p = Ustrrchr(vname, ' '); | |
1636 | result_tag = p ? p+1 : vname; | |
1637 | ||
1638 | if (Ustrcmp(result_tag, "FOUND") == 0) | |
1639 | { | |
1640 | /* p should still be the whitespace before the result_tag */ | |
1641 | while (isspace(*p)) --p; | |
1642 | *++p = '\0'; | |
1643 | /* Strip off the extended information too, which will be in parens | |
1644 | after the virus name, with no intervening whitespace. */ | |
1645 | if (*--p == ')') | |
4e71661f | 1646 | { |
0f0c8159 JH |
1647 | /* "(hash:size)", so previous '(' will do; if not found, we have |
1648 | a curious virus name, but not an error. */ | |
1649 | p = Ustrrchr(vname, '('); | |
1650 | if (p) | |
1651 | *p = '\0'; | |
4e71661f | 1652 | } |
0f0c8159 JH |
1653 | malware_name = string_copy(vname); |
1654 | DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name); | |
b1f8e4f8 | 1655 | |
0f0c8159 JH |
1656 | } |
1657 | else if (Ustrcmp(result_tag, "ERROR") == 0) | |
0ea02355 | 1658 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 | 1659 | string_sprintf("ClamAV returned: %s", av_buffer)); |
b1f8e4f8 | 1660 | |
0f0c8159 JH |
1661 | else if (Ustrcmp(result_tag, "OK") == 0) |
1662 | { | |
1663 | /* Everything should be OK */ | |
1664 | malware_name = NULL; | |
1665 | DEBUG(D_acl) debug_printf("Malware not found\n"); | |
b1f8e4f8 | 1666 | |
0f0c8159 JH |
1667 | } |
1668 | else | |
0ea02355 | 1669 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1670 | string_sprintf("unparseable response from ClamAV: {%s}", av_buffer)); |
1671 | ||
1672 | break; | |
b1f8e4f8 JH |
1673 | } /* clamd */ |
1674 | ||
1675 | case M_SOCK: /* "sock" scanner type ------------------------------------- */ | |
0f0c8159 JH |
1676 | /* This code was derived by Martin Poole from the clamd code contributed |
1677 | by David Saez and the cmdline code | |
1678 | */ | |
b1f8e4f8 | 1679 | { |
0f0c8159 JH |
1680 | int bread; |
1681 | uschar * commandline; | |
1682 | uschar av_buffer[1024]; | |
1683 | uschar * linebuffer; | |
1684 | uschar * sockline_scanner; | |
1685 | uschar sockline_scanner_default[] = "%s\n"; | |
1686 | const pcre *sockline_trig_re; | |
1687 | const pcre *sockline_name_re; | |
1688 | ||
1689 | /* find scanner command line */ | |
1690 | if ((sockline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
1691 | NULL, 0))) | |
1692 | { /* check for no expansions apart from one %s */ | |
1693 | uschar * s = Ustrchr(sockline_scanner, '%'); | |
1694 | if (s++) | |
1695 | if ((*s != 's' && *s != '%') || Ustrchr(s+1, '%')) | |
0ea02355 | 1696 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1697 | US"unsafe sock scanner call spec", sock); |
1698 | } | |
1699 | else | |
1700 | sockline_scanner = sockline_scanner_default; | |
b1f8e4f8 | 1701 | |
0f0c8159 JH |
1702 | /* find scanner output trigger */ |
1703 | sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1704 | "missing trigger specification", &errstr); | |
1705 | if (!sockline_trig_re) | |
0ea02355 | 1706 | return m_errlog_defer_3(scanent, NULL, errstr, sock); |
b1f8e4f8 | 1707 | |
0f0c8159 JH |
1708 | /* find virus name regex */ |
1709 | sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1710 | "missing virus name regex specification", &errstr); | |
1711 | if (!sockline_name_re) | |
0ea02355 | 1712 | return m_errlog_defer_3(scanent, NULL, errstr, sock); |
b1f8e4f8 | 1713 | |
0f0c8159 JH |
1714 | /* prepare scanner call - security depends on expansions check above */ |
1715 | commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id); | |
1716 | commandline = string_sprintf( CS sockline_scanner, CS commandline); | |
b1f8e4f8 JH |
1717 | |
1718 | ||
0f0c8159 JH |
1719 | /* Pass the command string to the socket */ |
1720 | if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0) | |
0ea02355 | 1721 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1722 | |
0f0c8159 JH |
1723 | /* Read the result */ |
1724 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
b1f8e4f8 | 1725 | |
0f0c8159 | 1726 | if (bread <= 0) |
0ea02355 | 1727 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1728 | string_sprintf("unable to read from socket (%s)", strerror(errno)), |
1729 | sock); | |
b1f8e4f8 | 1730 | |
0f0c8159 | 1731 | if (bread == sizeof(av_buffer)) |
0ea02355 JH |
1732 | return m_errlog_defer_3(scanent, CUS callout_address, |
1733 | US"buffer too small", sock); | |
0f0c8159 JH |
1734 | av_buffer[bread] = '\0'; |
1735 | linebuffer = string_copy(av_buffer); | |
b1f8e4f8 | 1736 | |
0f0c8159 JH |
1737 | /* try trigger match */ |
1738 | if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) | |
1739 | { | |
1740 | if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer))) | |
1741 | malware_name = US "unknown"; | |
b1f8e4f8 | 1742 | } |
0f0c8159 JH |
1743 | else /* no virus found */ |
1744 | malware_name = NULL; | |
1745 | break; | |
8523533c | 1746 | } |
8e669ac1 | 1747 | |
b1f8e4f8 JH |
1748 | case M_MKSD: /* "mksd" scanner type ------------------------------------- */ |
1749 | { | |
0f0c8159 JH |
1750 | char *mksd_options_end; |
1751 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1752 | int retval; | |
b1f8e4f8 | 1753 | |
0f0c8159 JH |
1754 | if (scanner_options) |
1755 | { | |
1756 | mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10); | |
1757 | if ( *scanner_options == '\0' | |
1758 | || *mksd_options_end != '\0' | |
1759 | || mksd_maxproc < 1 | |
1760 | || mksd_maxproc > 32 | |
1761 | ) | |
0ea02355 | 1762 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1763 | string_sprintf("invalid option '%s'", scanner_options)); |
1764 | } | |
8e669ac1 | 1765 | |
3e60dd41 | 1766 | if((sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0) |
0ea02355 | 1767 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
8e669ac1 | 1768 | |
0f0c8159 | 1769 | malware_name = NULL; |
94a18f28 | 1770 | |
0f0c8159 | 1771 | DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name); |
94a18f28 | 1772 | |
0f0c8159 JH |
1773 | if ((retval = mksd_scan_packed(scanent, sock, eml_filename, tmo)) != OK) |
1774 | { | |
1775 | close (sock); | |
1776 | return retval; | |
1777 | } | |
1778 | break; | |
8523533c | 1779 | } |
0f0c8159 | 1780 | |
b6fbf22d JH |
1781 | case M_AVAST: /* "avast" scanner type ----------------------------------- */ |
1782 | { | |
1783 | int ovector[1*3]; | |
1784 | uschar buf[1024]; | |
1785 | uschar * scanrequest; | |
b6fbf22d | 1786 | enum {AVA_HELO, AVA_OPT, AVA_RSP, AVA_DONE} avast_stage; |
0f0c8159 | 1787 | int nread; |
b6fbf22d JH |
1788 | |
1789 | /* According to Martin Tuma @avast the protocol uses "escaped | |
1790 | whitespace", that is, every embedded whitespace is backslash | |
1791 | escaped, as well as backslash is protected by backslash. | |
1792 | The returned lines contain the name of the scanned file, a tab | |
1793 | and the [ ] marker. | |
1794 | [+] - not infected | |
1795 | [L] - infected | |
1796 | [E] - some error occured | |
1797 | Such marker follows the first non-escaped TAB. */ | |
476be7e2 JH |
1798 | if ( ( !ava_re_clean |
1799 | && !(ava_re_clean = m_pcre_compile(ava_re_clean_str, &errstr))) | |
1800 | || ( !ava_re_virus | |
1801 | && !(ava_re_virus = m_pcre_compile(ava_re_virus_str, &errstr))) | |
b6fbf22d JH |
1802 | ) |
1803 | return malware_errlog_defer(errstr); | |
1804 | ||
1805 | /* wait for result */ | |
0f0c8159 JH |
1806 | for (avast_stage = AVA_HELO; |
1807 | (nread = recv_line(sock, buf, sizeof(buf), tmo)) > 0; | |
1808 | ) | |
b6fbf22d JH |
1809 | { |
1810 | int slen = Ustrlen(buf); | |
94431adb | 1811 | if (slen >= 1) |
b6fbf22d JH |
1812 | { |
1813 | DEBUG(D_acl) debug_printf("got from avast: %s\n", buf); | |
1814 | switch (avast_stage) | |
1815 | { | |
1816 | case AVA_HELO: | |
1817 | if (Ustrncmp(buf, "220", 3) != 0) | |
1818 | goto endloop; /* require a 220 */ | |
1819 | goto sendreq; | |
1820 | ||
1821 | case AVA_OPT: | |
1822 | if (Ustrncmp(buf, "210", 3) == 0) | |
1823 | break; /* ignore 210 responses */ | |
1824 | if (Ustrncmp(buf, "200", 3) != 0) | |
1825 | goto endloop; /* require a 200 */ | |
1826 | ||
1827 | sendreq: | |
1828 | { | |
1829 | int len; | |
1830 | /* Check for another option to send. Newline-terminate it. */ | |
1831 | if ((scanrequest = string_nextinlist(&av_scanner_work, &sep, | |
1832 | NULL, 0))) | |
1833 | { | |
1834 | scanrequest = string_sprintf("%s\n", scanrequest); | |
1835 | avast_stage = AVA_OPT; /* just sent option */ | |
1836 | } | |
1837 | else | |
1838 | { | |
1839 | scanrequest = string_sprintf("SCAN %s/scan/%s\n", | |
1840 | spool_directory, message_id); | |
1841 | avast_stage = AVA_RSP; /* just sent command */ | |
1842 | } | |
1843 | ||
1844 | /* send config-cmd or scan-request to socket */ | |
1845 | len = Ustrlen(scanrequest); | |
1846 | if (send(sock, scanrequest, len, 0) < 0) | |
1847 | { | |
1848 | scanrequest[len-1] = '\0'; | |
0ea02355 | 1849 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
b6fbf22d JH |
1850 | "unable to send request '%s' to socket (%s): %s", |
1851 | scanrequest, scanner_options, strerror(errno)), sock); | |
1852 | } | |
1853 | break; | |
1854 | } | |
1855 | ||
1856 | case AVA_RSP: | |
1857 | if (Ustrncmp(buf, "210", 3) == 0) | |
1858 | break; /* ignore the "210 SCAN DATA" message */ | |
1859 | ||
476be7e2 | 1860 | if (pcre_exec(ava_re_clean, NULL, CS buf, slen, |
b6fbf22d JH |
1861 | 0, 0, ovector, nelements(ovector)) > 0) |
1862 | break; | |
1863 | ||
476be7e2 | 1864 | if ((malware_name = m_pcre_exec(ava_re_virus, buf))) |
b6fbf22d JH |
1865 | { /* remove backslash in front of [whitespace|backslash] */ |
1866 | uschar * p, * p0; | |
94431adb | 1867 | for (p = malware_name; *p; ++p) |
b6fbf22d JH |
1868 | if (*p == '\\' && (isspace(p[1]) || p[1] == '\\')) |
1869 | for (p0 = p; *p0; ++p0) *p0 = p0[1]; | |
94431adb | 1870 | |
b6fbf22d JH |
1871 | avast_stage = AVA_DONE; |
1872 | goto endloop; | |
1873 | } | |
1874 | ||
94431adb | 1875 | if (Ustrncmp(buf, "200 SCAN OK", 11) == 0) |
b6fbf22d JH |
1876 | { /* we're done finally */ |
1877 | if (send(sock, "QUIT\n", 5, 0) < 0) /* courtesy */ | |
0ea02355 JH |
1878 | return m_errlog_defer_3(scanent, CUS callout_address, |
1879 | string_sprintf( | |
b6fbf22d JH |
1880 | "unable to send quit request to socket (%s): %s", |
1881 | scanner_options, strerror(errno)), | |
1882 | sock); | |
1883 | malware_name = NULL; | |
1884 | avast_stage = AVA_DONE; | |
1885 | goto endloop; | |
1886 | } | |
1887 | ||
1888 | /* here for any unexpected response from the scanner */ | |
1889 | goto endloop; | |
755762fd HSHR |
1890 | |
1891 | case AVA_DONE: log_write(0, LOG_PANIC, "%s:%d:%s: should not happen", | |
1892 | __FILE__, __LINE__, __FUNCTION__); | |
b6fbf22d | 1893 | } |
0f0c8159 | 1894 | } |
b6fbf22d | 1895 | } |
b6fbf22d JH |
1896 | endloop: |
1897 | ||
1898 | switch(avast_stage) | |
1899 | { | |
94431adb | 1900 | case AVA_HELO: |
b6fbf22d | 1901 | case AVA_OPT: |
0ea02355 | 1902 | case AVA_RSP: return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1903 | nread >= 0 |
1904 | ? string_sprintf( | |
1905 | "invalid response from scanner: '%s'", buf) | |
1906 | : nread == -1 | |
1907 | ? US"EOF from scanner" | |
1908 | : US"timeout from scanner", | |
1909 | sock); | |
b6fbf22d JH |
1910 | default: break; |
1911 | } | |
1912 | } | |
0f0c8159 JH |
1913 | break; |
1914 | } /* scanner type switch */ | |
8523533c | 1915 | |
0f0c8159 JH |
1916 | if (sock >= 0) |
1917 | (void) close (sock); | |
1918 | malware_ok = TRUE; /* set "been here, done that" marker */ | |
b1f8e4f8 | 1919 | } |
8523533c | 1920 | |
0f0c8159 JH |
1921 | /* match virus name against pattern (caseless ------->----------v) */ |
1922 | if (malware_name && regex_match_and_setup(re, malware_name, 0, -1)) | |
1923 | { | |
1924 | DEBUG(D_acl) debug_printf( | |
1925 | "Matched regex to malware [%s] [%s]\n", malware_re, malware_name); | |
1926 | return OK; | |
1927 | } | |
1928 | else | |
1929 | return FAIL; | |
8523533c TK |
1930 | } |
1931 | ||
1932 | ||
0f0c8159 JH |
1933 | /************************************************* |
1934 | * Scan an email for malware * | |
1935 | *************************************************/ | |
8523533c | 1936 | |
0f0c8159 JH |
1937 | /* This is the normal interface for scanning an email, which doesn't need a |
1938 | filename; it's a wrapper around the malware_file function. | |
8523533c | 1939 | |
0f0c8159 JH |
1940 | Arguments: |
1941 | malware_re match condition for "malware=" | |
1942 | timeout if nonzero, timeout in seconds | |
1943 | ||
1944 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
1945 | where true means malware was found (condition applies) | |
1946 | */ | |
1947 | int | |
1948 | malware(const uschar * malware_re, int timeout) | |
8523533c | 1949 | { |
0f0c8159 JH |
1950 | uschar * scan_filename; |
1951 | int ret; | |
8e669ac1 | 1952 | |
0f0c8159 JH |
1953 | scan_filename = string_sprintf("%s/scan/%s/%s.eml", |
1954 | spool_directory, message_id, message_id); | |
1955 | ret = malware_internal(malware_re, scan_filename, timeout, FALSE); | |
1956 | if (ret == DEFER) av_failed = TRUE; | |
1957 | ||
1958 | return ret; | |
8523533c TK |
1959 | } |
1960 | ||
8e669ac1 | 1961 | |
0f0c8159 JH |
1962 | /************************************************* |
1963 | * Scan a file for malware * | |
1964 | *************************************************/ | |
8e669ac1 | 1965 | |
0f0c8159 JH |
1966 | /* This is a test wrapper for scanning an email, which is not used in |
1967 | normal processing. Scan any file, using the Exim scanning interface. | |
1968 | This function tampers with various global variables so is unsafe to use | |
1969 | in any other context. | |
8e669ac1 | 1970 | |
0f0c8159 JH |
1971 | Arguments: |
1972 | eml_filename a file holding the message to be scanned | |
8523533c | 1973 | |
0f0c8159 JH |
1974 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) |
1975 | where true means malware was found (condition applies) | |
1976 | */ | |
1977 | int | |
1978 | malware_in_file(uschar *eml_filename) | |
8523533c | 1979 | { |
0f0c8159 JH |
1980 | uschar message_id_buf[64]; |
1981 | int ret; | |
8523533c | 1982 | |
0f0c8159 JH |
1983 | /* spool_mbox() assumes various parameters exist, when creating |
1984 | the relevant directory and the email within */ | |
1985 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
1986 | "dummy-%d", vaguely_random_number(INT_MAX)); | |
1987 | message_id = message_id_buf; | |
1988 | sender_address = US"malware-sender@example.net"; | |
1989 | return_path = US""; | |
1990 | recipients_list = NULL; | |
1991 | receive_add_recipient(US"malware-victim@example.net", -1); | |
1992 | enable_dollar_recipients = TRUE; | |
8e669ac1 | 1993 | |
0f0c8159 | 1994 | ret = malware_internal(US"*", eml_filename, 0, TRUE); |
8544e77a | 1995 | |
0f0c8159 JH |
1996 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
1997 | spool_mbox_ok = 1; | |
1998 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
1999 | set, but if that changes, then it should apply to these tests too */ | |
2000 | unspool_mbox(); | |
8e669ac1 | 2001 | |
0f0c8159 JH |
2002 | /* silence static analysis tools */ |
2003 | message_id = NULL; | |
8e669ac1 | 2004 | |
0f0c8159 | 2005 | return ret; |
8523533c TK |
2006 | } |
2007 | ||
476be7e2 JH |
2008 | |
2009 | void | |
2010 | malware_init(void) | |
2011 | { | |
2012 | if (!malware_default_re) | |
2013 | malware_default_re = regex_must_compile(malware_regex_default, FALSE, TRUE); | |
2014 | if (!drweb_re) | |
2015 | drweb_re = regex_must_compile(drweb_re_str, FALSE, TRUE); | |
2016 | if (!fsec_re) | |
2017 | fsec_re = regex_must_compile(fsec_re_str, FALSE, TRUE); | |
2018 | if (!kav_re_sus) | |
2019 | kav_re_sus = regex_must_compile(kav_re_sus_str, FALSE, TRUE); | |
2020 | if (!kav_re_inf) | |
2021 | kav_re_inf = regex_must_compile(kav_re_inf_str, FALSE, TRUE); | |
2022 | if (!ava_re_clean) | |
2023 | ava_re_clean = regex_must_compile(ava_re_clean_str, FALSE, TRUE); | |
2024 | if (!ava_re_virus) | |
2025 | ava_re_virus = regex_must_compile(ava_re_virus_str, FALSE, TRUE); | |
2026 | } | |
2027 | ||
b1f8e4f8 JH |
2028 | #endif /*WITH_CONTENT_SCAN*/ |
2029 | /* | |
2030 | * vi: aw ai sw=2 | |
2031 | */ |