1 /* $Cambridge: exim/src/src/malware.c,v 1.3 2004/12/17 14:52:44 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
10 /* Code for calling virus (malware) scanners. Called from acl.c. */
13 #ifdef WITH_CONTENT_SCAN
15 /* declaration of private routines */
16 int mksd_scan_packed(int sock
);
18 /* SHUT_WR seems to be undefined on Unixware? */
23 #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */
24 #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */
25 #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */
27 /* Routine to check whether a system is big- or litte-endian.
28 Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html
29 Needed for proper kavdaemon implementation. Sigh. */
30 #define BIG_MY_ENDIAN 0
31 #define LITTLE_MY_ENDIAN 1
32 int test_byte_order(void);
33 int test_byte_order() {
34 short int word
= 0x0001;
35 char *byte
= (char *) &word
;
36 return(byte
[0] ? LITTLE_MY_ENDIAN
: BIG_MY_ENDIAN
);
39 uschar malware_name_buffer
[256];
42 int malware(uschar
**listptr
) {
44 uschar
*list
= *listptr
;
45 uschar
*av_scanner_work
= av_scanner
;
47 uschar scanner_name_buffer
[16];
48 uschar
*malware_regex
;
49 uschar malware_regex_buffer
[64];
50 uschar malware_regex_default
[] = ".+";
51 unsigned long mbox_size
;
57 /* make sure the eml mbox file is spooled up */
58 mbox_file
= spool_mbox(&mbox_size
);
59 if (mbox_file
== NULL
) {
60 /* error while spooling */
61 log_write(0, LOG_MAIN
|LOG_PANIC
,
62 "malware acl condition: error while creating mbox spool file");
65 /* none of our current scanners need the mbox
66 file as a stream, so we can close it right away */
69 /* extract the malware regex to match against from the option list */
70 if ((malware_regex
= string_nextinlist(&list
, &sep
,
72 sizeof(malware_regex_buffer
))) != NULL
) {
74 /* parse 1st option */
75 if ( (strcmpic(malware_regex
,US
"false") == 0) ||
76 (Ustrcmp(malware_regex
,"0") == 0) ) {
77 /* explicitly no matching */
81 /* special cases (match anything except empty) */
82 if ( (strcmpic(malware_regex
,US
"true") == 0) ||
83 (Ustrcmp(malware_regex
,"*") == 0) ||
84 (Ustrcmp(malware_regex
,"1") == 0) ) {
85 malware_regex
= malware_regex_default
;
89 /* empty means "don't match anything" */
93 /* compile the regex, see if it works */
94 re
= pcre_compile(CS malware_regex
, PCRE_COPT
, (const char **)&rerror
, &roffset
, NULL
);
96 log_write(0, LOG_MAIN
|LOG_PANIC
,
97 "malware acl condition: regular expression error in '%s': %s at offset %d", malware_regex
, rerror
, roffset
);
101 /* if av_scanner starts with a dollar, expand it first */
102 if (*av_scanner
== '$') {
103 av_scanner_work
= expand_string(av_scanner
);
104 if (av_scanner_work
== NULL
) {
105 log_write(0, LOG_MAIN
|LOG_PANIC
,
106 "malware acl condition: av_scanner starts with $, but expansion failed: %s", expand_string_message
);
110 debug_printf("Expanded av_scanner global: %s\n", av_scanner_work
);
111 /* disable result caching in this case */
117 /* Do not scan twice. */
118 if (malware_ok
== 0) {
120 /* find the scanner type from the av_scanner option */
121 if ((scanner_name
= string_nextinlist(&av_scanner_work
, &sep
,
123 sizeof(scanner_name_buffer
))) == NULL
) {
124 /* no scanner given */
125 log_write(0, LOG_MAIN
|LOG_PANIC
,
126 "malware acl condition: av_scanner configuration variable is empty");
130 /* "drweb" scanner type ----------------------------------------------- */
131 /* v0.1 - added support for tcp sockets */
132 /* v0.0 - initial release -- support for unix sockets */
133 if (strcmpic(scanner_name
,US
"drweb") == 0) {
134 uschar
*drweb_options
;
135 uschar drweb_options_buffer
[1024];
136 uschar drweb_options_default
[] = "/usr/local/drweb/run/drwebd.sock";
137 struct sockaddr_un server
;
138 int sock
, result
, ovector
[30];
139 unsigned int port
, fsize
;
140 uschar tmpbuf
[1024], *drweb_fbuf
;
141 uschar scanrequest
[1024];
142 uschar drweb_match_string
[128];
143 int drweb_rc
, drweb_cmd
, drweb_flags
= 0x0000, drweb_fd
,
144 drweb_vnum
, drweb_slen
, drweb_fin
= 0x0000;
146 uschar hostname
[256];
151 if ((drweb_options
= string_nextinlist(&av_scanner_work
, &sep
,
152 drweb_options_buffer
, sizeof(drweb_options_buffer
))) == NULL
) {
153 /* no options supplied, use default options */
154 drweb_options
= drweb_options_default
;
157 if (*drweb_options
!= '/') {
159 /* extract host and port part */
160 if( sscanf(CS drweb_options
, "%s %u", hostname
, &port
) != 2 ) {
161 log_write(0, LOG_MAIN
|LOG_PANIC
,
162 "malware acl condition: drweb: invalid socket '%s'", drweb_options
);
166 /* Lookup the host */
167 if((he
= gethostbyname(CS hostname
)) == 0) {
168 log_write(0, LOG_MAIN
|LOG_PANIC
,
169 "malware acl condition: drweb: failed to lookup host '%s'", hostname
);
173 in
= *(struct in_addr
*) he
->h_addr_list
[0];
175 /* Open the drwebd TCP socket */
176 if ( (sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
177 log_write(0, LOG_MAIN
|LOG_PANIC
,
178 "malware acl condition: drweb: unable to acquire socket (%s)",
183 if (ip_connect(sock
, AF_INET
, (uschar
*)inet_ntoa(in
), port
, 5) < 0) {
185 log_write(0, LOG_MAIN
|LOG_PANIC
,
186 "malware acl condition: drweb: connection to %s, port %u failed (%s)",
187 inet_ntoa(in
), port
, strerror(errno
));
191 /* prepare variables */
192 drweb_cmd
= htonl(DRWEBD_SCAN_CMD
);
193 drweb_flags
= htonl(DRWEBD_RETURN_VIRUSES
| DRWEBD_IS_MAIL
);
194 snprintf(CS scanrequest
, 1024,CS
"%s/scan/%s/%s.eml",
195 spool_directory
, message_id
, message_id
);
198 drweb_fd
= open(CS scanrequest
, O_RDONLY
);
199 if (drweb_fd
== -1) {
200 log_write(0, LOG_MAIN
|LOG_PANIC
,
201 "malware acl condition: drweb: can't open spool file %s: %s",
202 scanrequest
, strerror(errno
));
205 fsize
= lseek(drweb_fd
, 0, SEEK_END
);
207 log_write(0, LOG_MAIN
|LOG_PANIC
,
208 "malware acl condition: drweb: can't seek spool file %s: %s",
209 scanrequest
, strerror(errno
));
212 drweb_slen
= htonl(fsize
);
213 lseek(drweb_fd
, 0, SEEK_SET
);
215 /* send scan request */
216 if ((send(sock
, &drweb_cmd
, sizeof(drweb_cmd
), 0) < 0) ||
217 (send(sock
, &drweb_flags
, sizeof(drweb_flags
), 0) < 0) ||
218 (send(sock
, &drweb_fin
, sizeof(drweb_fin
), 0) < 0) ||
219 (send(sock
, &drweb_slen
, sizeof(drweb_slen
), 0) < 0)) {
222 log_write(0, LOG_MAIN
|LOG_PANIC
,
223 "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options
);
227 drweb_fbuf
= (uschar
*) malloc (fsize
);
231 log_write(0, LOG_MAIN
|LOG_PANIC
,
232 "malware acl condition: drweb: unable to allocate memory %u for file (%s)",
237 result
= read (drweb_fd
, drweb_fbuf
, fsize
);
241 log_write(0, LOG_MAIN
|LOG_PANIC
,
242 "malware acl condition: drweb: can't read spool file %s: %s",
243 scanrequest
, strerror(errno
));
247 /* send file body to socket */
248 if (send(sock
, drweb_fbuf
, fsize
, 0) < 0) {
250 log_write(0, LOG_MAIN
|LOG_PANIC
,
251 "malware acl condition: drweb: unable to send file body to socket (%s)", drweb_options
);
258 /* open the drwebd UNIX socket */
259 sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
261 log_write(0, LOG_MAIN
|LOG_PANIC
,
262 "malware acl condition: drweb: can't open UNIX socket");
265 server
.sun_family
= AF_UNIX
;
266 Ustrcpy(server
.sun_path
, drweb_options
);
267 if (connect(sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
269 log_write(0, LOG_MAIN
|LOG_PANIC
,
270 "malware acl condition: drweb: unable to connect to socket (%s). errno=%d", drweb_options
, errno
);
274 /* prepare variables */
275 drweb_cmd
= htonl(DRWEBD_SCAN_CMD
);
276 drweb_flags
= htonl(DRWEBD_RETURN_VIRUSES
| DRWEBD_IS_MAIL
);
277 snprintf(CS scanrequest
, 1024,CS
"%s/scan/%s/%s.eml", spool_directory
, message_id
, message_id
);
278 drweb_slen
= htonl(Ustrlen(scanrequest
));
280 /* send scan request */
281 if ((send(sock
, &drweb_cmd
, sizeof(drweb_cmd
), 0) < 0) ||
282 (send(sock
, &drweb_flags
, sizeof(drweb_flags
), 0) < 0) ||
283 (send(sock
, &drweb_slen
, sizeof(drweb_slen
), 0) < 0) ||
284 (send(sock
, scanrequest
, Ustrlen(scanrequest
), 0) < 0) ||
285 (send(sock
, &drweb_fin
, sizeof(drweb_fin
), 0) < 0)) {
287 log_write(0, LOG_MAIN
|LOG_PANIC
,
288 "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options
);
293 /* wait for result */
294 if ((bread
= recv(sock
, &drweb_rc
, sizeof(drweb_rc
), 0) != sizeof(drweb_rc
))) {
296 log_write(0, LOG_MAIN
|LOG_PANIC
,
297 "malware acl condition: drweb: unable to read return code");
300 drweb_rc
= ntohl(drweb_rc
);
302 if ((bread
= recv(sock
, &drweb_vnum
, sizeof(drweb_vnum
), 0) != sizeof(drweb_vnum
))) {
304 log_write(0, LOG_MAIN
|LOG_PANIC
,
305 "malware acl condition: drweb: unable to read the number of viruses");
308 drweb_vnum
= ntohl(drweb_vnum
);
310 /* "virus(es) found" if virus number is > 0 */
314 uschar pre_malware_nb
[256];
316 malware_name
= malware_name_buffer
;
318 /* setup default virus name */
319 Ustrcpy(malware_name_buffer
,"unknown");
321 /* read and concatenate virus names into one string */
322 for (i
=0;i
<drweb_vnum
;i
++)
324 /* read the size of report */
325 if ((bread
= recv(sock
, &drweb_slen
, sizeof(drweb_slen
), 0) != sizeof(drweb_slen
))) {
327 log_write(0, LOG_MAIN
|LOG_PANIC
,
328 "malware acl condition: drweb: cannot read report size");
331 drweb_slen
= ntohl(drweb_slen
);
333 /* read report body */
334 if ((bread
= recv(sock
, tmpbuf
, drweb_slen
, 0)) != drweb_slen
) {
336 log_write(0, LOG_MAIN
|LOG_PANIC
,
337 "malware acl condition: drweb: cannot read report string");
340 tmpbuf
[drweb_slen
] = '\0';
342 /* set up match regex, depends on retcode */
343 Ustrcpy(drweb_match_string
, "infected\\swith\\s*(.+?)$");
345 drweb_re
= pcre_compile( CS drweb_match_string
,
347 (const char **)&rerror
,
351 /* try matcher on the line, grab substring */
352 result
= pcre_exec(drweb_re
, NULL
, CS tmpbuf
, Ustrlen(tmpbuf
), 0, 0, ovector
, 30);
354 pcre_copy_substring(CS tmpbuf
, ovector
, result
, 1, CS pre_malware_nb
, 255);
356 /* the first name we just copy to malware_name */
358 Ustrcpy(CS malware_name_buffer
, CS pre_malware_nb
);
360 /* concatenate each new virus name to previous */
361 int slen
= Ustrlen(malware_name_buffer
);
362 if (slen
< (slen
+Ustrlen(pre_malware_nb
))) {
363 Ustrcat(malware_name_buffer
, "/");
364 Ustrcat(malware_name_buffer
, pre_malware_nb
);
375 /* ----------------------------------------------------------------------- */
376 else if (strcmpic(scanner_name
,US
"aveserver") == 0) {
378 uschar kav_options_buffer
[1024];
379 uschar kav_options_default
[] = "/var/run/aveserver";
381 struct sockaddr_un server
;
384 if ((kav_options
= string_nextinlist(&av_scanner_work
, &sep
,
386 sizeof(kav_options_buffer
))) == NULL
) {
387 /* no options supplied, use default options */
388 kav_options
= kav_options_default
;
391 /* open the aveserver socket */
392 sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
394 log_write(0, LOG_MAIN
|LOG_PANIC
,
395 "malware acl condition: can't open UNIX socket.");
398 server
.sun_family
= AF_UNIX
;
399 Ustrcpy(server
.sun_path
, kav_options
);
400 if (connect(sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
402 log_write(0, LOG_MAIN
|LOG_PANIC
,
403 "malware acl condition: unable to connect to aveserver UNIX socket (%s). errno=%d", kav_options
, errno
);
407 /* read aveserver's greeting and see if it is ready (2xx greeting) */
408 recv_line(sock
, buf
, 32768);
411 /* aveserver is having problems */
413 log_write(0, LOG_MAIN
|LOG_PANIC
,
414 "malware acl condition: aveserver is unavailable (Responded: %s).", ((buf
[0] != 0) ? buf
: (uschar
*)"nothing") );
418 /* prepare our command */
419 snprintf(CS buf
, 32768, "SCAN bPQRSTUW %s/scan/%s/%s.eml\r\n", spool_directory
, message_id
, message_id
);
422 if (send(sock
, buf
, Ustrlen(buf
), 0) < 0) {
424 log_write(0, LOG_MAIN
|LOG_PANIC
,
425 "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options
);
430 /* read response lines, find malware name and final response */
431 while (recv_line(sock
, buf
, 32768) > 0) {
432 debug_printf("aveserver: %s\n", buf
);
433 if (buf
[0] == '2') break;
434 if (Ustrncmp(buf
,"322",3) == 0) {
435 uschar
*p
= Ustrchr(&buf
[4],' ');
437 Ustrcpy(malware_name_buffer
,&buf
[4]);
438 malware_name
= malware_name_buffer
;
444 /* "fsecure" scanner type ------------------------------------------------- */
445 else if (strcmpic(scanner_name
,US
"fsecure") == 0) {
446 uschar
*fsecure_options
;
447 uschar fsecure_options_buffer
[1024];
448 uschar fsecure_options_default
[] = "/var/run/.fsav";
449 struct sockaddr_un server
;
450 int sock
, i
, j
, bread
= 0;
451 uschar file_name
[1024];
452 uschar av_buffer
[1024];
454 static uschar
*cmdoptions
[] = { US
"CONFIGURE\tARCHIVE\t1\n",
455 US
"CONFIGURE\tTIMEOUT\t0\n",
456 US
"CONFIGURE\tMAXARCH\t5\n",
457 US
"CONFIGURE\tMIME\t1\n" };
460 if ((fsecure_options
= string_nextinlist(&av_scanner_work
, &sep
,
461 fsecure_options_buffer
,
462 sizeof(fsecure_options_buffer
))) == NULL
) {
463 /* no options supplied, use default options */
464 fsecure_options
= fsecure_options_default
;
467 /* open the fsecure socket */
468 sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
470 log_write(0, LOG_MAIN
|LOG_PANIC
,
471 "malware acl condition: unable to open fsecure socket %s (%s)",
472 fsecure_options
, strerror(errno
));
475 server
.sun_family
= AF_UNIX
;
476 Ustrcpy(server
.sun_path
, fsecure_options
);
477 if (connect(sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
479 log_write(0, LOG_MAIN
|LOG_PANIC
,
480 "malware acl condition: unable to connect to fsecure socket %s (%s)",
481 fsecure_options
, strerror(errno
));
486 memset(av_buffer
, 0, sizeof(av_buffer
));
487 for (i
=0; i
!= 4; i
++) {
488 /* debug_printf("send option \"%s\"",cmdoptions[i]); */
489 if (write(sock
, cmdoptions
[i
], Ustrlen(cmdoptions
[i
])) < 0) {
491 log_write(0, LOG_MAIN
|LOG_PANIC
,
492 "malware acl condition: unable to write fsecure option %d to %s (%s)",
493 i
, fsecure_options
, strerror(errno
));
497 bread
= read(sock
, av_buffer
, sizeof(av_buffer
));
498 if (bread
>0) av_buffer
[bread
]='\0';
501 log_write(0, LOG_MAIN
|LOG_PANIC
,
502 "malware acl condition: unable to read fsecure answer %d (%s)", i
, strerror(errno
));
505 for (j
=0;j
<bread
;j
++) if((av_buffer
[j
]=='\r')||(av_buffer
[j
]=='\n')) av_buffer
[j
] ='@';
506 /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
507 /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
510 /* pass the mailfile to fsecure */
511 snprintf(CS file_name
,1024,"SCAN\t%s/scan/%s/%s.eml\n", spool_directory
, message_id
, message_id
);
512 /* debug_printf("send scan %s",file_name); */
513 if (write(sock
, file_name
, Ustrlen(file_name
)) < 0) {
515 log_write(0, LOG_MAIN
|LOG_PANIC
,
516 "malware acl condition: unable to write fsecure scan to %s (%s)",
517 fsecure_options
, strerror(errno
));
522 /* todo also SUSPICION\t */
523 fs_inf
= pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT
, (const char **)&rerror
, &roffset
, NULL
);
525 /* read report, linewise */
529 memset(av_buffer
, 0, sizeof(av_buffer
));
531 bread
=read(sock
, &av_buffer
[i
], 1);
534 log_write(0, LOG_MAIN
|LOG_PANIC
,
535 "malware acl condition: unable to read fsecure result (%s)", strerror(errno
));
540 while ((i
< sizeof(av_buffer
)-1 ) && (av_buffer
[i
-1] != '\n'));
541 av_buffer
[i
-1] = '\0';
542 /* debug_printf("got line \"%s\"\n",av_buffer); */
544 /* Really search for virus again? */
545 if (malware_name
== NULL
) {
546 /* try matcher on the line, grab substring */
547 i
= pcre_exec(fs_inf
, NULL
, CS av_buffer
, Ustrlen(av_buffer
), 0, 0, ovector
, 30);
550 pcre_copy_substring(CS av_buffer
, ovector
, i
, 1, CS malware_name_buffer
, 255);
551 malware_name
= malware_name_buffer
;
555 while (Ustrstr(av_buffer
, "OK\tScan ok.") == NULL
);
558 /* ----------------------------------------------------------------------- */
560 /* "kavdaemon" scanner type ------------------------------------------------ */
561 else if (strcmpic(scanner_name
,US
"kavdaemon") == 0) {
563 uschar kav_options_buffer
[1024];
564 uschar kav_options_default
[] = "/var/run/AvpCtl";
565 struct sockaddr_un server
;
569 uschar scanrequest
[1024];
570 uschar kav_match_string
[128];
572 unsigned long kav_reportlen
, bread
;
575 if ((kav_options
= string_nextinlist(&av_scanner_work
, &sep
,
577 sizeof(kav_options_buffer
))) == NULL
) {
578 /* no options supplied, use default options */
579 kav_options
= kav_options_default
;
582 /* open the kavdaemon socket */
583 sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
585 log_write(0, LOG_MAIN
|LOG_PANIC
,
586 "malware acl condition: can't open UNIX socket.");
589 server
.sun_family
= AF_UNIX
;
590 Ustrcpy(server
.sun_path
, kav_options
);
591 if (connect(sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
593 log_write(0, LOG_MAIN
|LOG_PANIC
,
594 "malware acl condition: unable to connect to kavdaemon UNIX socket (%s). errno=%d", kav_options
, errno
);
598 /* get current date and time, build scan request */
600 strftime(CS tmpbuf
, sizeof(tmpbuf
), "<0>%d %b %H:%M:%S:%%s/scan/%%s", localtime(&t
));
601 snprintf(CS scanrequest
, 1024,CS tmpbuf
, spool_directory
, message_id
);
603 /* send scan request */
604 if (send(sock
, scanrequest
, Ustrlen(scanrequest
)+1, 0) < 0) {
606 log_write(0, LOG_MAIN
|LOG_PANIC
,
607 "malware acl condition: unable to write to kavdaemon UNIX socket (%s)", kav_options
);
611 /* wait for result */
612 if ((bread
= recv(sock
, tmpbuf
, 2, 0) != 2)) {
614 log_write(0, LOG_MAIN
|LOG_PANIC
,
615 "malware acl condition: unable to read 2 bytes from kavdaemon socket.");
619 /* get errorcode from one nibble */
620 if (test_byte_order() == LITTLE_MY_ENDIAN
) {
621 kav_rc
= tmpbuf
[0] & 0x0F;
624 kav_rc
= tmpbuf
[1] & 0x0F;
627 /* improper kavdaemon configuration */
628 if ( (kav_rc
== 5) || (kav_rc
== 6) ) {
630 log_write(0, LOG_MAIN
|LOG_PANIC
,
631 "malware acl condition: please reconfigure kavdaemon to NOT disinfect or remove infected files.");
637 log_write(0, LOG_MAIN
|LOG_PANIC
,
638 "malware acl condition: kavdaemon reported 'scanning not completed' (code 1).");
644 log_write(0, LOG_MAIN
|LOG_PANIC
,
645 "malware acl condition: kavdaemon reported 'kavdaemon damaged' (code 7).");
649 /* code 8 is not handled, since it is ambigous. It appears mostly on
650 bounces where part of a file has been cut off */
652 /* "virus found" return codes (2-4) */
653 if ((kav_rc
> 1) && (kav_rc
< 5)) {
656 /* setup default virus name */
657 Ustrcpy(malware_name_buffer
,"unknown");
658 malware_name
= malware_name_buffer
;
660 if (test_byte_order() == LITTLE_MY_ENDIAN
) {
661 report_flag
= tmpbuf
[1];
664 report_flag
= tmpbuf
[0];
667 /* read the report, if available */
668 if( report_flag
== 1 ) {
669 /* read report size */
670 if ((bread
= recv(sock
, &kav_reportlen
, 4, 0)) != 4) {
672 log_write(0, LOG_MAIN
|LOG_PANIC
,
673 "malware acl condition: cannot read report size from kavdaemon");
677 /* it's possible that avp returns av_buffer[1] == 1 but the
678 reportsize is 0 (!?) */
679 if (kav_reportlen
> 0) {
680 /* set up match regex, depends on retcode */
682 Ustrcpy(kav_match_string
, "suspicion:\\s*(.+?)\\s*$");
684 Ustrcpy(kav_match_string
, "infected:\\s*(.+?)\\s*$");
686 kav_re
= pcre_compile( CS kav_match_string
,
688 (const char **)&rerror
,
692 /* read report, linewise */
693 while (kav_reportlen
> 0) {
698 while ( recv(sock
, &tmpbuf
[bread
], 1, 0) == 1 ) {
700 if ( (tmpbuf
[bread
] == '\n') || (bread
> 1021) ) break;
704 tmpbuf
[bread
] = '\0';
706 /* try matcher on the line, grab substring */
707 result
= pcre_exec(kav_re
, NULL
, CS tmpbuf
, Ustrlen(tmpbuf
), 0, 0, ovector
, 30);
709 pcre_copy_substring(CS tmpbuf
, ovector
, result
, 1, CS malware_name_buffer
, 255);
723 /* ----------------------------------------------------------------------- */
726 /* "cmdline" scanner type ------------------------------------------------ */
727 else if (strcmpic(scanner_name
,US
"cmdline") == 0) {
728 uschar
*cmdline_scanner
;
729 uschar cmdline_scanner_buffer
[1024];
730 uschar
*cmdline_trigger
;
731 uschar cmdline_trigger_buffer
[1024];
732 const pcre
*cmdline_trigger_re
;
733 uschar
*cmdline_regex
;
734 uschar cmdline_regex_buffer
[1024];
735 const pcre
*cmdline_regex_re
;
736 uschar file_name
[1024];
737 uschar commandline
[1024];
738 void (*eximsigchld
)(int);
739 void (*eximsigpipe
)(int);
740 FILE *scanner_out
= NULL
;
741 FILE *scanner_record
= NULL
;
742 uschar linebuffer
[32767];
747 /* find scanner command line */
748 if ((cmdline_scanner
= string_nextinlist(&av_scanner_work
, &sep
,
749 cmdline_scanner_buffer
,
750 sizeof(cmdline_scanner_buffer
))) == NULL
) {
751 /* no command line supplied */
752 log_write(0, LOG_MAIN
|LOG_PANIC
,
753 "malware acl condition: missing commandline specification for cmdline scanner type.");
757 /* find scanner output trigger */
758 if ((cmdline_trigger
= string_nextinlist(&av_scanner_work
, &sep
,
759 cmdline_trigger_buffer
,
760 sizeof(cmdline_trigger_buffer
))) == NULL
) {
761 /* no trigger regex supplied */
762 log_write(0, LOG_MAIN
|LOG_PANIC
,
763 "malware acl condition: missing trigger specification for cmdline scanner type.");
767 /* precompile trigger regex */
768 cmdline_trigger_re
= pcre_compile(CS cmdline_trigger
, PCRE_COPT
, (const char **)&rerror
, &roffset
, NULL
);
769 if (cmdline_trigger_re
== NULL
) {
770 log_write(0, LOG_MAIN
|LOG_PANIC
,
771 "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_trigger_re
, rerror
, roffset
);
775 /* find scanner name regex */
776 if ((cmdline_regex
= string_nextinlist(&av_scanner_work
, &sep
,
777 cmdline_regex_buffer
,
778 sizeof(cmdline_regex_buffer
))) == NULL
) {
779 /* no name regex supplied */
780 log_write(0, LOG_MAIN
|LOG_PANIC
,
781 "malware acl condition: missing virus name regex specification for cmdline scanner type.");
785 /* precompile name regex */
786 cmdline_regex_re
= pcre_compile(CS cmdline_regex
, PCRE_COPT
, (const char **)&rerror
, &roffset
, NULL
);
787 if (cmdline_regex_re
== NULL
) {
788 log_write(0, LOG_MAIN
|LOG_PANIC
,
789 "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_regex_re
, rerror
, roffset
);
793 /* prepare scanner call */
794 snprintf(CS file_name
,1024,"%s/scan/%s", spool_directory
, message_id
);
795 snprintf(CS commandline
,1024, CS cmdline_scanner
,file_name
);
796 /* redirect STDERR too */
797 Ustrcat(commandline
," 2>&1");
799 /* store exims signal handlers */
800 eximsigchld
= signal(SIGCHLD
,SIG_DFL
);
801 eximsigpipe
= signal(SIGPIPE
,SIG_DFL
);
803 scanner_out
= popen(CS commandline
,"r");
804 if (scanner_out
== NULL
) {
805 log_write(0, LOG_MAIN
|LOG_PANIC
,
806 "malware acl condition: calling cmdline scanner (%s) failed: %s.", commandline
, strerror(errno
));
807 signal(SIGCHLD
,eximsigchld
);
808 signal(SIGPIPE
,eximsigpipe
);
812 snprintf(CS file_name
,1024,"%s/scan/%s/%s_scanner_output", spool_directory
, message_id
, message_id
);
813 scanner_record
= fopen(CS file_name
,"w");
815 if (scanner_record
== NULL
) {
816 log_write(0, LOG_MAIN
|LOG_PANIC
,
817 "malware acl condition: opening scanner output file (%s) failed: %s.", file_name
, strerror(errno
));
819 signal(SIGCHLD
,eximsigchld
);
820 signal(SIGPIPE
,eximsigpipe
);
824 /* look for trigger while recording output */
825 while(fgets(CS linebuffer
,32767,scanner_out
) != NULL
) {
826 if ( Ustrlen(linebuffer
) > fwrite(linebuffer
, 1, Ustrlen(linebuffer
), scanner_record
) ) {
828 log_write(0, LOG_MAIN
|LOG_PANIC
,
829 "malware acl condition: short write on scanner output file (%s).", file_name
);
831 signal(SIGCHLD
,eximsigchld
);
832 signal(SIGPIPE
,eximsigpipe
);
835 /* try trigger match */
836 if (!trigger
&& regex_match_and_setup(cmdline_trigger_re
, linebuffer
, 0, -1))
840 fclose(scanner_record
);
842 signal(SIGCHLD
,eximsigchld
);
843 signal(SIGPIPE
,eximsigpipe
);
846 /* setup default virus name */
847 Ustrcpy(malware_name_buffer
,"unknown");
848 malware_name
= malware_name_buffer
;
850 /* re-open the scanner output file, look for name match */
851 scanner_record
= fopen(CS file_name
,"r");
852 while(fgets(CS linebuffer
,32767,scanner_record
) != NULL
) {
854 result
= pcre_exec(cmdline_regex_re
, NULL
, CS linebuffer
, Ustrlen(linebuffer
), 0, 0, ovector
, 30);
856 pcre_copy_substring(CS linebuffer
, ovector
, result
, 1, CS malware_name_buffer
, 255);
859 fclose(scanner_record
);
866 /* ----------------------------------------------------------------------- */
869 /* "sophie" scanner type ------------------------------------------------- */
870 else if (strcmpic(scanner_name
,US
"sophie") == 0) {
871 uschar
*sophie_options
;
872 uschar sophie_options_buffer
[1024];
873 uschar sophie_options_default
[] = "/var/run/sophie";
875 struct sockaddr_un server
;
877 uschar file_name
[1024];
878 uschar av_buffer
[1024];
880 if ((sophie_options
= string_nextinlist(&av_scanner_work
, &sep
,
881 sophie_options_buffer
,
882 sizeof(sophie_options_buffer
))) == NULL
) {
883 /* no options supplied, use default options */
884 sophie_options
= sophie_options_default
;
887 /* open the sophie socket */
888 sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
890 log_write(0, LOG_MAIN
|LOG_PANIC
,
891 "malware acl condition: can't open UNIX socket.");
894 server
.sun_family
= AF_UNIX
;
895 Ustrcpy(server
.sun_path
, sophie_options
);
896 if (connect(sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
898 log_write(0, LOG_MAIN
|LOG_PANIC
,
899 "malware acl condition: unable to connect to sophie UNIX socket (%s). errno=%d", sophie_options
, errno
);
903 /* pass the scan directory to sophie */
904 snprintf(CS file_name
,1024,"%s/scan/%s", spool_directory
, message_id
);
905 if (write(sock
, file_name
, Ustrlen(file_name
)) < 0) {
907 log_write(0, LOG_MAIN
|LOG_PANIC
,
908 "malware acl condition: unable to write to sophie UNIX socket (%s)", sophie_options
);
912 write(sock
, "\n", 1);
914 /* wait for result */
915 memset(av_buffer
, 0, sizeof(av_buffer
));
916 if ((!(bread
= read(sock
, av_buffer
, sizeof(av_buffer
))) > 0)) {
918 log_write(0, LOG_MAIN
|LOG_PANIC
,
919 "malware acl condition: unable to read from sophie UNIX socket (%s)", sophie_options
);
926 if (av_buffer
[0] == '1') {
927 if (Ustrchr(av_buffer
, '\n')) *Ustrchr(av_buffer
, '\n') = '\0';
928 Ustrcpy(malware_name_buffer
,&av_buffer
[2]);
929 malware_name
= malware_name_buffer
;
931 else if (!strncmp(CS av_buffer
, "-1", 2)) {
932 log_write(0, LOG_MAIN
|LOG_PANIC
,
933 "malware acl condition: malware acl condition: sophie reported error");
937 /* all ok, no virus */
941 /* ----------------------------------------------------------------------- */
944 /* "clamd" scanner type ------------------------------------------------- */
945 /* This code was contributed by David Saez <david@ols.es> */
946 else if (strcmpic(scanner_name
,US
"clamd") == 0) {
947 uschar
*clamd_options
;
948 uschar clamd_options_buffer
[1024];
949 uschar clamd_options_default
[] = "/tmp/clamd";
951 struct sockaddr_un server
;
954 uschar file_name
[1024];
955 uschar av_buffer
[1024];
956 uschar hostname
[256];
960 if ((clamd_options
= string_nextinlist(&av_scanner_work
, &sep
,
961 clamd_options_buffer
,
962 sizeof(clamd_options_buffer
))) == NULL
) {
963 /* no options supplied, use default options */
964 clamd_options
= clamd_options_default
;
967 /* socket does not start with '/' -> network socket */
968 if (*clamd_options
!= '/') {
970 /* extract host and port part */
971 if( sscanf(CS clamd_options
, "%s %u", hostname
, &port
) != 2 ) {
972 log_write(0, LOG_MAIN
|LOG_PANIC
,
973 "malware acl condition: clamd: invalid socket '%s'", clamd_options
);
977 /* Lookup the host */
978 if((he
= gethostbyname(CS hostname
)) == 0) {
979 log_write(0, LOG_MAIN
|LOG_PANIC
,
980 "malware acl condition: clamd: failed to lookup host '%s'", hostname
);
984 in
= *(struct in_addr
*) he
->h_addr_list
[0];
986 /* Open the ClamAV Socket */
987 if ( (sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
988 log_write(0, LOG_MAIN
|LOG_PANIC
,
989 "malware acl condition: clamd: unable to acquire socket (%s)",
994 if (ip_connect(sock
, AF_INET
, (uschar
*)inet_ntoa(in
), port
, 5) < 0) {
996 log_write(0, LOG_MAIN
|LOG_PANIC
,
997 "malware acl condition: clamd: connection to %s, port %u failed (%s)",
998 inet_ntoa(in
), port
, strerror(errno
));
1003 /* open the local socket */
1004 if ((sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
1005 log_write(0, LOG_MAIN
|LOG_PANIC
,
1006 "malware acl condition: clamd: unable to acquire socket (%s)",
1011 server
.sun_family
= AF_UNIX
;
1012 Ustrcpy(server
.sun_path
, clamd_options
);
1014 if (connect(sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
1016 log_write(0, LOG_MAIN
|LOG_PANIC
,
1017 "malware acl condition: clamd: unable to connect to UNIX socket %s (%s)",
1018 clamd_options
, strerror(errno
) );
1023 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1025 snprintf(CS file_name
,1024,"SCAN %s/scan/%s\n", spool_directory
, message_id
);
1027 if (send(sock
, file_name
, Ustrlen(file_name
), 0) < 0) {
1029 log_write(0, LOG_MAIN
|LOG_PANIC
,"malware acl condition: clamd: unable to write to socket (%s)",
1035 We're done sending, close socket for writing.
1037 One user reported that clamd 0.70 does not like this any more ...
1041 /* shutdown(sock, SHUT_WR); */
1043 /* Read the result */
1044 memset(av_buffer
, 0, sizeof(av_buffer
));
1045 bread
= read(sock
, av_buffer
, sizeof(av_buffer
));
1049 log_write(0, LOG_MAIN
|LOG_PANIC
,
1050 "malware acl condition: clamd: unable to read from socket (%s)",
1055 if (bread
== sizeof(av_buffer
)) {
1056 log_write(0, LOG_MAIN
|LOG_PANIC
,
1057 "malware acl condition: clamd: buffer too small");
1061 /* Check the result. ClamAV Returns
1062 infected: -> "<filename>: <virusname> FOUND"
1063 not-infected: -> "<filename>: OK"
1064 error: -> "<filename>: <errcode> ERROR */
1066 if (!(*av_buffer
)) {
1067 log_write(0, LOG_MAIN
|LOG_PANIC
,
1068 "malware acl condition: clamd: ClamAV returned null");
1072 /* colon in returned output? */
1073 if((p
= Ustrrchr(av_buffer
,':')) == NULL
) {
1074 log_write(0, LOG_MAIN
|LOG_PANIC
,
1075 "malware acl condition: clamd: ClamAV returned malformed result: %s",
1080 /* strip filename strip CR at the end */
1082 while (*p
== ' ') ++p
;
1084 p
= vname
+ Ustrlen(vname
) - 1;
1085 if( *p
== '\n' ) *p
= '\0';
1087 if ((p
= Ustrstr(vname
, "FOUND"))!=NULL
) {
1089 for (--p
;p
>vname
&& *p
<=32;p
--) *p
=0;
1090 for (;*vname
==32;vname
++);
1091 Ustrcpy(malware_name_buffer
,vname
);
1092 malware_name
= malware_name_buffer
;
1095 if (Ustrstr(vname
, "ERROR")!=NULL
) {
1096 /* ClamAV reports ERROR
1098 for (;*vname
!='\n' && vname
>av_buffer
; vname
--);
1099 if (*vname
=='\n') vname
++;
1101 log_write(0, LOG_MAIN
|LOG_PANIC
,
1102 "malware acl condition: clamd: ClamAV returned %s",vname
);
1106 /* Everything should be OK */
1107 malware_name
= NULL
;
1111 /* ----------------------------------------------------------------------- */
1114 /* "mksd" scanner type --------------------------------------------------- */
1115 else if (strcmpic(scanner_name
,US
"mksd") == 0) {
1116 uschar
*mksd_options
;
1117 char *mksd_options_end
;
1118 uschar mksd_options_buffer
[32];
1119 int mksd_maxproc
= 1; /* default, if no option supplied */
1120 struct sockaddr_un server
;
1124 if ((mksd_options
= string_nextinlist(&av_scanner_work
, &sep
,
1125 mksd_options_buffer
,
1126 sizeof(mksd_options_buffer
))) != NULL
) {
1127 mksd_maxproc
= (int) strtol(CS mksd_options
, &mksd_options_end
, 10);
1128 if ((*mksd_options
== '\0') || (*mksd_options_end
!= '\0') ||
1129 (mksd_maxproc
< 1) || (mksd_maxproc
> 32)) {
1130 log_write(0, LOG_MAIN
|LOG_PANIC
,
1131 "malware acl condition: mksd: invalid option '%s'", mksd_options
);
1136 /* open the mksd socket */
1137 sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
1139 log_write(0, LOG_MAIN
|LOG_PANIC
,
1140 "malware acl condition: can't open UNIX socket.");
1143 server
.sun_family
= AF_UNIX
;
1144 Ustrcpy(server
.sun_path
, "/var/run/mksd/socket");
1145 if (connect(sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
1147 log_write(0, LOG_MAIN
|LOG_PANIC
,
1148 "malware acl condition: unable to connect to mksd UNIX socket (/var/run/mksd/socket). errno=%d", errno
);
1152 malware_name
= NULL
;
1154 retval
= mksd_scan_packed(sock
);
1159 /* ----------------------------------------------------------------------- */
1161 /* "unknown" scanner type ------------------------------------------------- */
1163 log_write(0, LOG_MAIN
|LOG_PANIC
,
1164 "malware condition: unknown scanner type '%s'", scanner_name
);
1167 /* ----------------------------------------------------------------------- */
1169 /* set "been here, done that" marker */
1173 /* match virus name against pattern (caseless ------->----------v) */
1174 if ( (malware_name
!= NULL
) &&
1175 (regex_match_and_setup(re
, malware_name
, 0, -1)) ) {
1184 /* simple wrapper for reading lines from sockets */
1185 int recv_line(int sock
, uschar
*buffer
, int size
) {
1188 memset(buffer
,0,size
);
1190 while(recv(sock
,p
,1,0) > -1) {
1191 if ((p
-buffer
) > (size
-2)) break;
1192 if (*p
== '\n') break;
1193 if (*p
!= '\r') p
++;
1201 /* ============= private routines for the "mksd" scanner type ============== */
1203 #include <sys/uio.h>
1205 int mksd_writev (int sock
, struct iovec
*iov
, int iovcnt
)
1211 i
= writev (sock
, iov
, iovcnt
);
1212 while ((i
< 0) && (errno
== EINTR
));
1215 log_write(0, LOG_MAIN
|LOG_PANIC
,
1216 "malware acl condition: unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1221 if (i
>= iov
->iov_len
) {
1228 iov
->iov_base
= CS iov
->iov_base
+ i
;
1234 int mksd_read_lines (int sock
, uschar
*av_buffer
, int av_buffer_size
)
1240 if ((i
= recv (sock
, av_buffer
+offset
, av_buffer_size
-offset
, 0)) <= 0) {
1242 log_write(0, LOG_MAIN
|LOG_PANIC
,
1243 "malware acl condition: unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1248 /* offset == av_buffer_size -> buffer full */
1249 if (offset
== av_buffer_size
) {
1251 log_write(0, LOG_MAIN
|LOG_PANIC
,
1252 "malware acl condition: malformed reply received from mksd");
1255 } while (av_buffer
[offset
-1] != '\n');
1257 av_buffer
[offset
] = '\0';
1261 int mksd_parse_line (char *line
)
1272 if ((p
= strchr (line
, '\n')) != NULL
)
1274 log_write(0, LOG_MAIN
|LOG_PANIC
,
1275 "malware acl condition: mksd scanner failed: %s", line
);
1279 if ((p
= strchr (line
, '\n')) != NULL
) {
1281 if (((p
-line
) > 5) && ((p
-line
) < sizeof (malware_name_buffer
)) && (line
[3] == ' '))
1282 if (((p
= strchr (line
+4, ' ')) != NULL
) && ((p
-line
) > 4)) {
1284 Ustrcpy (malware_name_buffer
, line
+4);
1285 malware_name
= malware_name_buffer
;
1289 log_write(0, LOG_MAIN
|LOG_PANIC
,
1290 "malware acl condition: malformed reply received from mksd: %s", line
);
1295 int mksd_scan_packed (int sock
)
1297 struct iovec iov
[7];
1298 char *cmd
= "MSQ/scan/.eml\n";
1299 uschar av_buffer
[1024];
1301 iov
[0].iov_base
= cmd
;
1303 iov
[1].iov_base
= CS spool_directory
;
1304 iov
[1].iov_len
= Ustrlen (spool_directory
);
1305 iov
[2].iov_base
= cmd
+ 3;
1307 iov
[3].iov_base
= iov
[5].iov_base
= CS message_id
;
1308 iov
[3].iov_len
= iov
[5].iov_len
= Ustrlen (message_id
);
1309 iov
[4].iov_base
= cmd
+ 3;
1311 iov
[6].iov_base
= cmd
+ 9;
1314 if (mksd_writev (sock
, iov
, 7) < 0)
1317 if (mksd_read_lines (sock
, av_buffer
, sizeof (av_buffer
)) < 0)
1322 return mksd_parse_line (CS av_buffer
);