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