1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-2013 */
8 /* Code for calling virus (malware) scanners. Called from acl.c. */
11 #ifdef WITH_CONTENT_SCAN
13 /* The maximum number of clamd servers that are supported in the configuration */
14 #define MAX_CLAMD_SERVERS 32
15 #define MAX_CLAMD_SERVERS_S "32"
16 /* Maximum length of the hostname that can be specified in the clamd address list */
17 #define MAX_CLAMD_ADDRESS_LENGTH 64
18 #define MAX_CLAMD_ADDRESS_LENGTH_S "64"
20 typedef struct clamd_address_container {
21 uschar tcp_addr[MAX_CLAMD_ADDRESS_LENGTH];
22 unsigned int tcp_port;
23 } clamd_address_container;
25 /* declaration of private routines */
26 static int mksd_scan_packed(int sock, uschar *scan_filename);
27 static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking);
29 /* SHUT_WR seems to be undefined on Unixware? */
35 # define nelements(arr) (sizeof(arr) / sizeof(arr[0]))
39 #define MALWARE_TIMEOUT 120
42 #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */
43 #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */
44 #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */
46 #define DERR_READ_ERR (1<<0) /* read error */
47 #define DERR_NOMEMORY (1<<2) /* no memory */
48 #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */
49 #define DERR_BAD_CALL (1<<15) /* wrong command */
51 /* Routine to check whether a system is big- or litte-endian.
52 Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html
53 Needed for proper kavdaemon implementation. Sigh. */
54 #define BIG_MY_ENDIAN 0
55 #define LITTLE_MY_ENDIAN 1
56 int test_byte_order(void);
60 short int word = 0x0001;
61 char *byte = (char *) &word;
62 return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN);
65 static uschar * malware_name_internal = NULL;
68 /* Gross hacks for the -bmalware option; perhaps we should just create
69 the scan directory normally for that case, but look into rigging up the
70 needed header variables if not already set on the command-line? */
71 extern int spool_mbox_ok;
72 extern uschar spooled_message_id[17];
74 /*************************************************
75 * Scan an email for malware *
76 *************************************************/
78 /* This is the normal interface for scanning an email, which doesn't need a
79 filename; it's a wrapper around the malware_file function.
82 listptr the list of options to the "malware = ..." ACL condition
84 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
85 where true means malware was found (condition applies)
88 malware(uschar **listptr)
90 uschar * scan_filename;
93 scan_filename = string_sprintf("%s/scan/%s/%s.eml",
94 spool_directory, message_id, message_id);
95 ret = malware_internal(listptr, scan_filename, FALSE);
96 if (ret == DEFER) av_failed = TRUE;
102 /*************************************************
103 * Scan a file for malware *
104 *************************************************/
106 /* This is a test wrapper for scanning an email, which is not used in
107 normal processing. Scan any file, using the Exim scanning interface.
108 This function tampers with various global variables so is unsafe to use
109 in any other context.
112 eml_filename a file holding the message to be scanned
114 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
115 where true means malware was found (condition applies)
118 malware_in_file(uschar *eml_filename)
120 uschar *scan_options[2];
121 uschar message_id_buf[64];
124 scan_options[0] = US"*";
125 scan_options[1] = NULL;
127 /* spool_mbox() assumes various parameters exist, when creating
128 the relevant directory and the email within */
129 (void) string_format(message_id_buf, sizeof(message_id_buf),
130 "dummy-%d", vaguely_random_number(INT_MAX));
131 message_id = message_id_buf;
132 sender_address = US"malware-sender@example.net";
134 recipients_list = NULL;
135 receive_add_recipient(US"malware-victim@example.net", -1);
136 enable_dollar_recipients = TRUE;
138 ret = malware_internal(scan_options, eml_filename, TRUE);
140 Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id));
142 /* don't set no_mbox_unspool; at present, there's no way for it to become
143 set, but if that changes, then it should apply to these tests too */
146 /* silence static analysis tools */
154 malware_errlog(const uschar * str)
156 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
159 malware_errlog_defer(const uschar * str)
166 m_scanner_errlog_defer(const uschar * scanner, const uschar * str)
168 return malware_errlog_defer(string_sprintf("%s: %s", scanner, str));
172 fprotd_errlog_defer(const uschar * str)
174 return m_scanner_errlog_defer("f-protd", str);
177 drweb_errlog_defer(const uschar * str)
179 return m_scanner_errlog_defer("drweb", str);
182 aves_errlog_defer(const uschar * str)
184 return m_scanner_errlog_defer("aveserver", str);
187 fsec_errlog_defer(const uschar * str)
189 return m_scanner_errlog_defer("fsecure", str);
192 kavd_errlog_defer(const uschar * str)
194 return m_scanner_errlog_defer("kavdaemon", str);
197 cmdl_errlog_defer(const uschar * str)
199 return m_scanner_errlog_defer("commandline", str);
202 soph_errlog_defer(const uschar * str)
204 return m_scanner_errlog_defer("sophie", str);
207 clmd_errlog_defer(const uschar * str)
209 return m_scanner_errlog_defer("clamd", str);
212 mksd_errlog_defer(const uschar * str)
214 return m_scanner_errlog_defer("mksd", str);
218 clmd_errlog(const uschar * str)
220 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: clamd: %s", str);
223 /*************************************************/
226 m_unixsocket(uschar * path, uschar ** errstr)
229 struct sockaddr_un server;
231 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
232 *errstr = "can't open UNIX socket.";
236 server.sun_family = AF_UNIX;
237 Ustrcpy(server.sun_path, path);
238 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
241 *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
242 path, strerror(err));
249 m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
251 if (send(sock, buf, cnt, 0) < 0) {
254 *errstr = string_sprintf("unable to send to socket (%s): %s",
261 /*************************************************
262 * Scan content for malware *
263 *************************************************/
265 /* This is an internal interface for scanning an email; the normal interface
266 is via malware(), or there's malware_in_file() used for testing/debugging.
269 listptr the list of options to the "malware = ..." ACL condition
270 eml_filename the file holding the email to be scanned
271 faking whether or not we're faking this up for the -bmalware test
273 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
274 where true means malware was found (condition applies)
277 malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
280 uschar *list = *listptr;
281 uschar *av_scanner_work = av_scanner;
282 uschar *scanner_name;
283 uschar *malware_regex;
284 uschar malware_regex_default[] = ".+";
285 unsigned long mbox_size;
289 const uschar *rerror;
292 /* make sure the eml mbox file is spooled up */
293 mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL);
294 if (mbox_file == NULL) /* error while spooling */
295 return malware_errlog_defer("error while creating mbox spool file");
297 /* none of our current scanners need the mbox
298 file as a stream, so we can close it right away */
299 (void)fclose(mbox_file);
301 /* extract the malware regex to match against from the option list */
302 if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0))) {
304 /* parse 1st option */
305 if ( (strcmpic(malware_regex,US"false") == 0) ||
306 (Ustrcmp(malware_regex,"0") == 0) ) {
307 /* explicitly no matching */
311 /* special cases (match anything except empty) */
312 if ( (strcmpic(malware_regex,US"true") == 0) ||
313 (Ustrcmp(malware_regex,"*") == 0) ||
314 (Ustrcmp(malware_regex,"1") == 0) ) {
315 malware_regex = malware_regex_default;
318 else /* empty means "don't match anything" */
321 /* Reset sep that is set by previous string_nextinlist() call */
324 /* compile the regex, see if it works */
325 re = pcre_compile(CS malware_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
327 return malware_errlog_defer(
328 string_sprintf("regular expression error in '%s': %s at offset %d",
329 malware_regex, rerror, roffset));
331 /* if av_scanner starts with a dollar, expand it first */
332 if (*av_scanner == '$') {
333 av_scanner_work = expand_string(av_scanner);
334 if (!av_scanner_work)
335 return malware_errlog_defer(
336 string_sprintf("av_scanner starts with $, but expansion failed: %s",
337 expand_string_message));
339 debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
340 /* disable result caching in this case */
346 /* Do not scan twice. */
347 if (malware_ok == 0) {
349 /* find the scanner type from the av_scanner option */
350 if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) {
351 /* no scanner given */
352 return malware_errlog_defer("av_scanner configuration variable is empty");
355 /* "f-protd" scanner type ----------------------------------------------- */
356 if (strcmpic(scanner_name, US"f-protd") == 0) {
357 uschar *fp_options, *fp_scan_option;
358 uschar fp_options_default[] = "localhost 10200-10204";
359 uschar hostname[256];
360 unsigned int port, portlow, porthigh, connect_ok=0, detected=0, par_count = 0;
364 uschar * scanrequest;
365 uschar buf[32768], *strhelper, *strhelper2;
367 if (!(fp_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
368 fp_options = fp_options_default;
370 /* extract host and port part */
371 if ( sscanf(CS fp_options, "%255s %u-%u", hostname, &portlow, &porthigh) != 3 ) {
372 if ( sscanf(CS fp_options, "%s %u", hostname, &portlow) != 2 )
373 return fprotd_errlog_defer(
374 string_sprintf("invalid socket '%s'", fp_options));
378 /* Lookup the host */
379 if((he = gethostbyname(CS hostname)) == 0)
380 return fprotd_errlog_defer(
381 string_sprintf("failed to lookup host '%s'", hostname));
383 in = *(struct in_addr *) he->h_addr_list[0];
387 /* Open the f-protd TCP socket */
388 if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0)
389 return fprotd_errlog_defer(
390 string_sprintf("unable to acquire socket (%s)", strerror(errno)));
392 /* Try to connect to all portslow-high until connection is established */
393 for (port = portlow; !connect_ok && port < porthigh; port++)
394 if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0)
400 return fprotd_errlog_defer(
401 string_sprintf("connection to %s, port %u-%u failed (%s)",
402 inet_ntoa(in), portlow, porthigh, strerror(err)));
405 DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
406 scanrequest = string_sprintf("GET %s", eml_filename);
408 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
410 scanrequest = string_sprintf("%s%s%s", scanrequest,
411 par_count ? "%20" : "?", fp_scan_option);
414 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
416 /* send scan request */
417 if (m_sock_send(sock, &scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
418 return fprotd_errlog_defer(errstr);
420 /* We get a lot of empty lines, so we need this hack to check for any data at all */
421 while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
422 if ( recv_line(sock, buf, 32768) > 0) {
423 if ( Ustrstr(buf, US"<detected type=\"") != NULL )
425 else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
426 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
428 malware_name_internal = string_copy(strhelper+6);
430 } else if ( Ustrstr(buf, US"<summary code=\"") )
431 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
432 ? malware_name_internal : NULL;
437 /* "drweb" scanner type ----------------------------------------------- */
438 /* v0.1 - added support for tcp sockets */
439 /* v0.0 - initial release -- support for unix sockets */
440 else if (strcmpic(scanner_name,US"drweb") == 0) {
441 uschar *drweb_options;
442 uschar drweb_options_default[] = "/usr/local/drweb/run/drwebd.sock";
443 struct sockaddr_un server;
444 int sock, result, ovector[10*3];
445 unsigned int port, fsize;
446 uschar * tmpbuf, *drweb_fbuf;
447 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
448 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
450 uschar hostname[256];
455 if (!(drweb_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
456 drweb_options = drweb_options_default;
458 if (*drweb_options != '/') {
460 /* extract host and port part */
461 if( sscanf(CS drweb_options, "%255s %u", hostname, &port) != 2 )
462 return drweb_errlog_defer(
463 string_sprintf("invalid socket '%s'", drweb_options));
465 /* Lookup the host */
466 if((he = gethostbyname(CS hostname)) == 0)
467 return drweb_errlog_defer(
468 string_sprintf("failed to lookup host '%s'", hostname));
470 in = *(struct in_addr *) he->h_addr_list[0];
472 /* Open the drwebd TCP socket */
473 if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0)
474 return drweb_errlog_defer(
475 string_sprintf("unable to acquire socket (%s)", strerror(errno)));
477 if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
480 return drweb_errlog_defer(
481 string_sprintf("connection to %s, port %u failed (%s)",
482 inet_ntoa(in), port, strerror(err)));
485 /* prepare variables */
486 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
487 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
490 drweb_fd = open(CS eml_filename, O_RDONLY);
491 if (drweb_fd == -1) {
494 return drweb_errlog_defer(
495 string_sprintf("can't open spool file %s: %s",
496 eml_filename, strerror(err)));
498 fsize = lseek(drweb_fd, 0, SEEK_END);
502 (void)close(drweb_fd);
503 return drweb_errlog_defer(
504 string_sprintf("can't seek spool file %s: %s",
505 eml_filename, strerror(err)));
507 drweb_slen = htonl(fsize);
508 lseek(drweb_fd, 0, SEEK_SET);
510 DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s %u]\n",
511 scanner_name, hostname, port);
513 /* send scan request */
514 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
515 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
516 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
517 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
519 (void)close(drweb_fd);
520 return drweb_errlog_defer(
521 string_sprintf("unable to send commands to socket (%s)", drweb_options));
524 drweb_fbuf = (uschar *) malloc (fsize);
527 (void)close(drweb_fd);
528 return drweb_errlog_defer(
529 string_sprintf("unable to allocate memory %u for file (%s)",
530 fsize, eml_filename));
533 result = read (drweb_fd, drweb_fbuf, fsize);
537 (void)close(drweb_fd);
539 return drweb_errlog_defer(
540 string_sprintf("can't read spool file %s: %s",
541 eml_filename, strerror(err)));
543 (void)close(drweb_fd);
545 /* send file body to socket */
546 if (send(sock, drweb_fbuf, fsize, 0) < 0) {
549 return drweb_errlog_defer(
550 string_sprintf("unable to send file body to socket (%s)", drweb_options));
552 (void)close(drweb_fd);
555 if((sock = m_unixsocket(drweb_options, &errstr)) < 0)
556 return drweb_errlog_defer(errstr);
558 /* prepare variables */
559 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
560 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
561 drweb_slen = htonl(Ustrlen(eml_filename));
563 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
564 scanner_name, drweb_options);
566 /* send scan request */
567 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
568 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
569 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
570 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
571 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) {
573 return drweb_errlog_defer(
574 string_sprintf("unable to send commands to socket (%s)", drweb_options));
578 /* wait for result */
579 if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) {
581 return drweb_errlog_defer("unable to read return code");
583 drweb_rc = ntohl(drweb_rc);
585 if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) {
587 return drweb_errlog_defer("unable to read the number of viruses");
589 drweb_vnum = ntohl(drweb_vnum);
591 /* "virus(es) found" if virus number is > 0 */
596 /* setup default virus name */
597 malware_name_internal = "unknown";
598 malware_name = malware_name_internal;
600 /* set up match regex */
601 drweb_re = pcre_compile( "infected\\swith\\s*(.+?)$", PCRE_COPT,
602 (const char **)&rerror, &roffset, NULL );
604 /* read and concatenate virus names into one string */
605 for (i=0;i<drweb_vnum;i++)
607 int size = 0, off = 0;
608 /* read the size of report */
609 if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) {
611 return drweb_errlog_defer("cannot read report size");
613 drweb_slen = ntohl(drweb_slen);
614 tmpbuf = store_get(drweb_slen);
616 /* read report body */
617 if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) {
619 return drweb_errlog_defer("cannot read report string");
621 tmpbuf[drweb_slen] = '\0';
623 /* try matcher on the line, grab substring */
624 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
625 ovector, nelements(ovector));
627 const char * pre_malware_nb;
629 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
631 /* the first name we just copy to malware_name */
633 malware_name_internal = string_append(NULL, &size, &off,
636 /* concatenate each new virus name to previous */
637 malware_name_internal = string_append(malware_name_internal,
638 &size, &off, 2, "/", pre_malware_nb);
640 pcre_free_substring(pre_malware_nb);
645 const char *drweb_s = NULL;
647 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
648 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
649 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
650 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
651 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
652 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
653 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
654 * and others are ignored */
657 return drweb_errlog_defer(
658 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s));
665 /* ----------------------------------------------------------------------- */
666 else if (strcmpic(scanner_name,US"aveserver") == 0) {
668 uschar kav_options_default[] = "/var/run/aveserver";
670 struct sockaddr_un server;
674 if (!(kav_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
675 kav_options = kav_options_default;
677 if((sock = m_unixsocket(kav_options, &errstr)) < 0)
678 return aves_errlog_defer(errstr);
680 /* read aveserver's greeting and see if it is ready (2xx greeting) */
681 recv_line(sock, buf, sizeof(buf));
684 /* aveserver is having problems */
686 return aves_errlog_defer(
687 string_sprintf("unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
690 /* prepare our command */
691 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
694 DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
697 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
698 return aves_errlog_defer(errstr);
702 /* read response lines, find malware name and final response */
703 while (recv_line(sock, buf, sizeof(buf)) > 0) {
704 debug_printf("aveserver: %s\n", buf);
708 /* aveserver is having problems */
709 log_write(0, LOG_MAIN|LOG_PANIC,
710 "malware acl condition: unable to scan file %s (Responded: %s).",
714 } else if (Ustrncmp(buf,"322",3) == 0) {
715 uschar *p = Ustrchr(&buf[4],' ');
717 malware_name_internal = string_copy(&buf[4]);
718 malware_name = malware_name_internal;
722 /* prepare our command */
723 (void)string_format(buf, sizeof(buf), "quit\r\n");
726 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
727 return aves_errlog_defer(errstr);
729 /* read aveserver's greeting and see if it is ready (2xx greeting) */
730 recv_line(sock, buf, sizeof(buf));
733 /* aveserver is having problems */
735 return aves_errlog_defer(
736 string_sprintf("unable to quit dialogue (Responded: %s).",
737 ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
742 if (result == DEFER) return DEFER;
744 /* "fsecure" scanner type ------------------------------------------------- */
745 else if (strcmpic(scanner_name,US"fsecure") == 0) {
746 uschar *fsec_options;
747 uschar fsec_options_default[] = "/var/run/.fsav";
748 struct sockaddr_un server;
749 int sock, i, j, bread = 0;
751 uschar av_buffer[1024];
753 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
754 US"CONFIGURE\tTIMEOUT\t0\n",
755 US"CONFIGURE\tMAXARCH\t5\n",
756 US"CONFIGURE\tMIME\t1\n" };
759 if (!(fsec_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
760 fsec_options = fsec_options_default;
762 if((sock = m_unixsocket(fsec_options, &errstr)) < 0)
763 return fsec_errlog_defer(errstr);
765 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
766 scanner_name, fsec_options);
769 memset(av_buffer, 0, sizeof(av_buffer));
770 for (i=0; i != nelements(cmdopt); i++) {
771 /* debug_printf("send option \"%s\"",cmdopt[i]); */
773 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
774 return fsec_errlog_defer(errstr);
776 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
777 if (bread >0) av_buffer[bread]='\0';
781 return fsec_errlog_defer(
782 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)));
784 for (j=0;j<bread;j++)
785 if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
787 /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
788 /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
791 /* pass the mailfile to fsecure */
792 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
794 /* debug_printf("send scan %s", file_name); */
795 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
796 return fsec_errlog_defer(errstr);
799 /* todo also SUSPICION\t */
800 fs_inf = pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT, (const char **)&rerror, &roffset, NULL);
802 /* read report, linewise */
806 memset(av_buffer, 0, sizeof(av_buffer));
808 bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT);
812 return fsec_errlog_defer(
813 string_sprintf("unable to read result (%s)", strerror(err)));
817 while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n'));
818 av_buffer[i-1] = '\0';
819 /* debug_printf("got line \"%s\"\n",av_buffer); */
821 /* Really search for virus again? */
822 if (malware_name == NULL) {
823 /* try matcher on the line, grab substring */
824 i = pcre_exec(fs_inf, NULL, CS av_buffer, Ustrlen(av_buffer), 0, 0,
825 ovector, nelements(ovector));
828 pcre_get_substring(CS av_buffer, ovector, i, 1,
829 (const char **) &malware_name_internal);
830 malware_name = malware_name_internal;
834 while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
837 /* ----------------------------------------------------------------------- */
839 /* "kavdaemon" scanner type ------------------------------------------------ */
840 else if (strcmpic(scanner_name,US"kavdaemon") == 0) {
842 uschar kav_options_default[] = "/var/run/AvpCtl";
843 struct sockaddr_un server;
847 uschar * scanrequest;
849 unsigned long kav_reportlen, bread;
853 if (!(kav_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
854 kav_options = kav_options_default;
856 if((sock = m_unixsocket(kav_options, &errstr)) < 0)
857 return kavd_errlog_defer(errstr);
859 /* get current date and time, build scan request */
861 /* pdp note: before the eml_filename parameter, this scanned the
862 directory; not finding documentation, so we'll strip off the directory.
863 The side-effect is that the test framework scanning may end up in
864 scanning more than was requested, but for the normal interface, this is
866 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
867 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
868 p = Ustrrchr(scanrequest, '/');
872 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
873 scanner_name, kav_options);
875 /* send scan request */
876 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
877 return kavd_errlog_defer(errstr);
879 /* wait for result */
880 if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) {
882 return kavd_errlog_defer("unable to read 2 bytes from socket.");
885 /* get errorcode from one nibble */
886 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
888 /* improper kavdaemon configuration */
889 if ( (kav_rc == 5) || (kav_rc == 6) ) {
891 return kavd_errlog_defer("please reconfigure kavdaemon to NOT disinfect or remove infected files.");
896 return kavd_errlog_defer("reported 'scanning not completed' (code 1).");
901 return kavd_errlog_defer("reported 'kavdaemon damaged' (code 7).");
904 /* code 8 is not handled, since it is ambigous. It appears mostly on
905 bounces where part of a file has been cut off */
907 /* "virus found" return codes (2-4) */
908 if ((kav_rc > 1) && (kav_rc < 5)) {
911 /* setup default virus name */
912 malware_name_internal = string_copy("unknown");
913 malware_name = malware_name_internal;
915 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
917 /* read the report, if available */
918 if( report_flag == 1 ) {
919 /* read report size */
920 if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) {
922 return kavd_errlog_defer("cannot read report size");
925 /* it's possible that avp returns av_buffer[1] == 1 but the
926 reportsize is 0 (!?) */
927 if (kav_reportlen > 0) {
928 /* set up match regex, depends on retcode */
929 kav_re = pcre_compile( kav_rc == 3
930 ? "suspicion:\\s*(.+?)\\s*$"
931 : "infected:\\s*(.+?)\\s*$",
933 (const char **)&rerror,
937 /* read report, linewise */
938 while (kav_reportlen > 0) {
943 while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
945 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
949 tmpbuf[bread] = '\0';
951 /* try matcher on the line, grab substring */
952 result = pcre_exec(kav_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
953 ovector, nelements(ovector));
955 pcre_get_substring(CS tmpbuf, ovector, result, 1,
956 (const char **) &malware_name_internal);
963 else /* no virus found */
968 /* ----------------------------------------------------------------------- */
971 /* "cmdline" scanner type ------------------------------------------------ */
972 else if (strcmpic(scanner_name,US"cmdline") == 0) {
973 uschar *cmdline_scanner;
974 uschar *cmdline_trigger;
975 const pcre *cmdline_trigger_re;
976 uschar *cmdline_regex;
977 const pcre *cmdline_regex_re;
979 uschar * commandline;
980 void (*eximsigchld)(int);
981 void (*eximsigpipe)(int);
982 FILE *scanner_out = NULL;
983 FILE *scanner_record = NULL;
984 uschar linebuffer[32767];
991 /* find scanner command line */
992 if (!(cmdline_scanner = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
993 return cmdl_errlog_defer("missing commandline specification");
995 /* find scanner output trigger */
996 if (!(cmdline_trigger = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
997 return cmdl_errlog_defer("missing trigger specification");
999 /* precompile trigger regex */
1000 cmdline_trigger_re = pcre_compile(CS cmdline_trigger, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
1001 if (cmdline_trigger_re == NULL)
1002 return cmdl_errlog_defer(
1003 string_sprintf("regular expression error in '%s': %s at offset %d",
1004 cmdline_trigger, rerror, roffset));
1006 /* find scanner name regex */
1007 if (!(cmdline_regex = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
1008 return cmdl_errlog_defer("missing virus name regex specification");
1010 /* precompile name regex */
1011 cmdline_regex_re = pcre_compile(CS cmdline_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
1012 if (cmdline_regex_re == NULL)
1013 return cmdl_errlog_defer(
1014 string_sprintf("regular expression error in '%s': %s at offset %d",
1015 cmdline_regex, rerror, roffset));
1017 /* prepare scanner call; despite the naming, file_name holds a directory
1018 name which is documented as the value given to %s. */
1020 file_name = string_copy(eml_filename);
1021 p = Ustrrchr(file_name, '/');
1024 commandline = string_sprintf(CS cmdline_scanner, file_name);
1026 /* redirect STDERR too */
1027 commandline = string_sprintf("%s 2>&1", commandline);
1029 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
1031 /* store exims signal handlers */
1032 eximsigchld = signal(SIGCHLD,SIG_DFL);
1033 eximsigpipe = signal(SIGPIPE,SIG_DFL);
1035 scanner_out = popen(CS commandline,"r");
1036 if (scanner_out == NULL) {
1038 signal(SIGCHLD,eximsigchld);
1039 signal(SIGPIPE,eximsigpipe);
1040 return cmdl_errlog_defer(
1041 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
1044 file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
1045 spool_directory, message_id, message_id);
1046 scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
1048 if (scanner_record == NULL) {
1050 pclose(scanner_out);
1051 signal(SIGCHLD,eximsigchld);
1052 signal(SIGPIPE,eximsigpipe);
1053 return cmdl_errlog_defer(
1054 string_sprintf("opening scanner output file (%s) failed: %s.",
1055 file_name, strerror(err)));
1058 /* look for trigger while recording output */
1059 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out) != NULL) {
1060 if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
1062 pclose(scanner_out);
1063 signal(SIGCHLD,eximsigchld);
1064 signal(SIGPIPE,eximsigpipe);
1065 return cmdl_errlog_defer(
1066 string_sprintf("short write on scanner output file (%s).", file_name));
1068 /* try trigger match */
1069 if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
1073 (void)fclose(scanner_record);
1074 pclose(scanner_out);
1075 signal(SIGCHLD,eximsigchld);
1076 signal(SIGPIPE,eximsigpipe);
1079 /* setup default virus name */
1080 malware_name = US"unknown";
1082 /* re-open the scanner output file, look for name match */
1083 scanner_record = fopen(CS file_name, "rb");
1084 while(fgets(CS linebuffer,32767,scanner_record) != NULL) {
1086 result = pcre_exec(cmdline_regex_re, NULL,
1087 CS linebuffer, Ustrlen(linebuffer), 0, 0,
1088 ovector, nelements(ovector));
1090 pcre_get_substring(CS linebuffer, ovector, result, 1,
1091 (const char **) &malware_name_internal);
1093 (void)fclose(scanner_record);
1095 else /* no virus found */
1096 malware_name = NULL;
1098 /* ----------------------------------------------------------------------- */
1101 /* "sophie" scanner type ------------------------------------------------- */
1102 else if (strcmpic(scanner_name,US"sophie") == 0) {
1103 uschar * soph_options;
1104 uschar soph_default_options[] = "/var/run/sophie";
1106 struct sockaddr_un server;
1110 uschar av_buffer[1024];
1112 if (!(soph_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
1113 soph_options = soph_default_options;
1115 if((sock = m_unixsocket(soph_options, &errstr)) < 0)
1116 return soph_errlog_defer(errstr);
1118 /* pass the scan directory to sophie */
1119 file_name = string_copy(eml_filename);
1120 if ((p = Ustrrchr(file_name, '/')))
1123 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
1124 scanner_name, soph_options);
1126 if ( write(sock, file_name, Ustrlen(file_name)) < 0
1127 || write(sock, "\n", 1) != 1
1130 return soph_errlog_defer(
1131 string_sprintf("unable to write to UNIX socket (%s)", soph_options));
1134 /* wait for result */
1135 memset(av_buffer, 0, sizeof(av_buffer));
1136 if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) {
1138 return soph_errlog_defer(
1139 string_sprintf("unable to read from UNIX socket (%s)", soph_options));
1145 if (av_buffer[0] == '1') {
1146 if (Ustrchr(av_buffer, '\n')) *Ustrchr(av_buffer, '\n') = '\0';
1147 malware_name_internal = string_copy(&av_buffer[2]);
1148 malware_name = malware_name_internal;
1150 else if (!strncmp(CS av_buffer, "-1", 2))
1151 return soph_errlog_defer("scanner reported error");
1152 else /* all ok, no virus */
1153 malware_name = NULL;
1155 /* ----------------------------------------------------------------------- */
1158 /* "clamd" scanner type ------------------------------------------------- */
1159 /* This code was originally contributed by David Saez */
1160 /* There are three scanning methods available to us:
1161 * (1) Use the SCAN command, pointing to a file in the filesystem
1162 * (2) Use the STREAM command, send the data on a separate port
1163 * (3) Use the zINSTREAM command, send the data inline
1164 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1165 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1166 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1167 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
1168 * WITH_OLD_CLAMAV_STREAM is defined.
1169 * See Exim bug 926 for details. */
1170 else if (strcmpic(scanner_name,US"clamd") == 0) {
1171 uschar *clamd_options = NULL;
1172 uschar clamd_options_default[] = "/tmp/clamd";
1173 uschar *p, *vname, *result_tag, *response_end;
1174 struct sockaddr_un server;
1178 uschar av_buffer[1024];
1179 uschar *hostname = "";
1182 uschar *clamav_fbuf;
1183 int clam_fd, result;
1185 BOOL use_scan_command = FALSE;
1186 clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
1188 int num_servers = 0;
1189 #ifdef WITH_OLD_CLAMAV_STREAM
1190 uschar av_buffer2[1024];
1193 uint32_t send_size, send_final_zeroblock;
1196 if (!(clamd_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
1197 clamd_options = clamd_options_default;
1199 if (*clamd_options == '/')
1200 /* Local file; so we def want to use_scan_command and don't want to try
1201 * passing IP/port combinations */
1202 use_scan_command = TRUE;
1204 uschar *address = clamd_options;
1205 uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
1207 /* Go through the rest of the list of host/port and construct an array
1208 * of servers to try. The first one is the bit we just passed from
1209 * clamd_options so process that first and then scan the remainder of
1210 * the address buffer */
1212 clamd_address_container *this_clamd;
1214 /* The 'local' option means use the SCAN command over the network
1215 * socket (ie common file storage in use) */
1216 if (strcmpic(address,US"local") == 0) {
1217 use_scan_command = TRUE;
1221 /* XXX: If unsuccessful we should free this memory */
1223 (clamd_address_container *)store_get(sizeof(clamd_address_container));
1225 /* extract host and port part */
1226 if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
1227 this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
1228 clmd_errlog(string_sprintf("invalid address '%s'", address));
1232 clamd_address_vector[num_servers] = this_clamd;
1234 if (num_servers >= MAX_CLAMD_SERVERS) {
1235 clmd_errlog("More than " MAX_CLAMD_SERVERS_S " clamd servers "
1236 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1239 } while ((address = string_nextinlist(&av_scanner_work, &sep,
1241 sizeof(address_buffer))) != NULL);
1243 /* check if we have at least one server */
1245 return clmd_errlog_defer("no useable server addresses in malware configuration option.");
1248 /* See the discussion of response formats below to see why we really don't
1249 like colons in filenames when passing filenames to ClamAV. */
1250 if (use_scan_command && Ustrchr(eml_filename, ':'))
1251 return clmd_errlog_defer(
1252 string_sprintf("local/SCAN mode incompatible with" \
1253 " : in path to email filename [%s]", eml_filename));
1255 /* We have some network servers specified */
1258 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1259 * only supports AF_INET, but we should probably be looking to the
1260 * future and rewriting this to be protocol-independent anyway. */
1262 while ( num_servers > 0 ) {
1263 /* Randomly pick a server to start with */
1264 current_server = random_number( num_servers );
1266 debug_printf("trying server name %s, port %u\n",
1267 clamd_address_vector[current_server]->tcp_addr,
1268 clamd_address_vector[current_server]->tcp_port);
1270 /* Lookup the host. This is to ensure that we connect to the same IP
1271 * on both connections (as one host could resolve to multiple ips) */
1272 if((he = gethostbyname(CS clamd_address_vector[current_server]->tcp_addr))
1274 clmd_errlog(string_sprintf("failed to lookup host '%s'",
1275 clamd_address_vector[current_server]->tcp_addr));
1276 goto try_next_server;
1279 in = *(struct in_addr *) he->h_addr_list[0];
1281 /* Open the ClamAV Socket */
1282 if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
1283 clmd_errlog(string_sprintf("unable to acquire socket (%s)",
1285 goto try_next_server;
1288 if (ip_connect( sock,
1290 (uschar*)inet_ntoa(in),
1291 clamd_address_vector[current_server]->tcp_port,
1293 /* Connection successfully established with a server */
1294 hostname = clamd_address_vector[current_server]->tcp_addr;
1297 clmd_errlog(string_sprintf(
1298 "malware acl condition: clamd: connection to %s, port %u failed (%s)",
1299 clamd_address_vector[current_server]->tcp_addr,
1300 clamd_address_vector[current_server]->tcp_port,
1307 /* Remove the server from the list. XXX We should free the memory */
1310 for( i = current_server; i < num_servers; i++ )
1311 clamd_address_vector[i] = clamd_address_vector[i+1];
1314 if ( num_servers == 0 )
1315 return clmd_errlog_defer("all servers failed");
1318 if((sock = m_unixsocket(clamd_options, &errstr)) < 0)
1319 return clmd_errlog_defer(errstr);
1322 /* have socket in variable "sock"; command to use is semi-independent of
1323 * the socket protocol. We use SCAN if is local (either Unix/local
1324 * domain socket, or explicitly told local) else we stream the data.
1325 * How we stream the data depends upon how we were built. */
1327 if (!use_scan_command) {
1329 #ifdef WITH_OLD_CLAMAV_STREAM
1330 /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
1331 * that port on a second connection; then in the scan-method-neutral
1332 * part, read the response back on the original connection. */
1334 DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
1337 /* Pass the string to ClamAV (7 = "STREAM\n") */
1338 if (m_sock_send(sock, "STREAM\n", 7, &errstr) < 0)
1339 return clmd_errlog_defer(errstr);
1341 memset(av_buffer2, 0, sizeof(av_buffer2));
1342 bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1347 return clmd_errlog_defer(
1348 string_sprintf("unable to read PORT from socket (%s)",
1352 if (bread == sizeof(av_buffer2)) {
1354 return clmd_errlog_defer("buffer too small");
1357 if (!(*av_buffer2)) {
1359 return clmd_errlog_defer("ClamAV returned null");
1362 av_buffer2[bread] = '\0';
1363 if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) {
1365 return clmd_errlog_defer(
1366 string_sprintf("Expected port information from clamd, got '%s'",
1370 if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
1373 return clmd_errlog_defer(
1374 string_sprintf("unable to acquire socket (%s)", strerror(err)));
1377 if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
1379 (void)close(sockData); (void)close(sock);
1380 return clmd_errlog_defer(
1381 string_sprintf("connection to %s, port %u failed (%s)",
1382 inet_ntoa(in), port, strerror(err)));
1385 #define CLOSE_SOCKDATA (void)close(sockData)
1386 #else /* WITH_OLD_CLAMAV_STREAM not defined */
1387 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1388 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1391 DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1394 /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
1395 if (send(sock, "zINSTREAM", 10, 0) < 0) {
1398 return clmd_errlog_defer(
1399 string_sprintf("unable to send zINSTREAM to socket (%s)",
1403 #define CLOSE_SOCKDATA /**/
1406 /* calc file size */
1407 clam_fd = open(CS eml_filename, O_RDONLY);
1408 if (clam_fd == -1) {
1410 CLOSE_SOCKDATA; (void)close(sock);
1411 return clmd_errlog_defer(
1412 string_sprintf("can't open spool file %s: %s",
1413 eml_filename, strerror(err)));
1415 fsize = lseek(clam_fd, 0, SEEK_END);
1418 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1419 return clmd_errlog_defer(
1420 string_sprintf("can't seek spool file %s: %s",
1421 eml_filename, strerror(errno)));
1423 lseek(clam_fd, 0, SEEK_SET);
1425 clamav_fbuf = (uschar *) malloc (fsize);
1427 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1428 return clmd_errlog_defer(
1429 string_sprintf("unable to allocate memory %u for file (%s)",
1430 fsize, eml_filename));
1433 result = read (clam_fd, clamav_fbuf, fsize);
1436 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1438 return clmd_errlog_defer(
1439 string_sprintf("can't read spool file %s: %s",
1440 eml_filename, strerror(err)));
1442 (void)close(clam_fd);
1444 /* send file body to socket */
1445 #ifdef WITH_OLD_CLAMAV_STREAM
1446 if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1447 CLOSE_SOCKDATA; (void)close(sock);
1449 return clmd_errlog_defer(
1450 string_sprintf("unable to send file body to socket (%s:%u)",
1454 send_size = htonl(fsize);
1455 send_final_zeroblock = 0;
1456 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1457 (send(sock, clamav_fbuf, fsize, 0) < 0) ||
1458 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1462 return clmd_errlog_defer(
1463 string_sprintf("unable to send file body to socket (%s:%u)",
1471 #undef CLOSE_SOCKDATA
1473 } else { /* use scan command */
1474 /* Send a SCAN command pointing to a filename; then in the then in the
1475 * scan-method-neutral part, read the response back */
1477 /* ================================================================= */
1479 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1480 which dates to when ClamAV needed us to break apart the email into the
1481 MIME parts (eg, with the now deprecated demime condition coming first).
1482 Some time back, ClamAV gained the ability to deconstruct the emails, so
1483 doing this would actually have resulted in the mail attachments being
1484 scanned twice, in the broken out files and from the original .eml.
1485 Since ClamAV now handles emails (and has for quite some time) we can
1486 just use the email file itself. */
1487 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1488 file_name = string_sprintf("SCAN %s\n", eml_filename);
1490 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
1491 scanner_name, clamd_options);
1493 if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
1496 return clmd_errlog_defer(
1497 string_sprintf("unable to write to socket (%s)", strerror(err)));
1500 /* Do not shut down the socket for writing; a user report noted that
1501 * clamd 0.70 does not react well to this. */
1503 /* Commands have been sent, no matter which scan method or connection
1504 * type we're using; now just read the result, independent of method. */
1506 /* Read the result */
1507 memset(av_buffer, 0, sizeof(av_buffer));
1508 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1512 return clmd_errlog_defer(
1513 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1515 if (bread == sizeof(av_buffer))
1516 return clmd_errlog_defer("buffer too small");
1517 /* We're now assured of a NULL at the end of av_buffer */
1519 /* Check the result. ClamAV returns one of two result formats.
1520 In the basic mode, the response is of the form:
1521 infected: -> "<filename>: <virusname> FOUND"
1522 not-infected: -> "<filename>: OK"
1523 error: -> "<filename>: <errcode> ERROR
1524 If the ExtendedDetectionInfo option has been turned on, then we get:
1525 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1526 for the infected case. Compare:
1527 /tmp/eicar.com: Eicar-Test-Signature FOUND
1528 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1530 In the streaming case, clamd uses the filename "stream" which you should
1531 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1532 client app will replace "stream" with the original filename before returning
1533 results to stdout, but the trace shows the data).
1535 We will assume that the pathname passed to clamd from Exim does not contain
1536 a colon. We will have whined loudly above if the eml_filename does (and we're
1537 passing a filename to clamd). */
1540 return clmd_errlog_defer("ClamAV returned null");
1542 /* strip newline at the end (won't be present for zINSTREAM)
1543 (also any trailing whitespace, which shouldn't exist, but we depend upon
1544 this below, so double-check) */
1545 p = av_buffer + Ustrlen(av_buffer) - 1;
1546 if (*p == '\n') *p = '\0';
1548 DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
1550 while (isspace(*--p) && (p > av_buffer))
1555 /* colon in returned output? */
1556 if((p = Ustrchr(av_buffer,':')) == NULL)
1557 return clmd_errlog_defer(
1558 string_sprintf("ClamAV returned malformed result (missing colon): %s",
1561 /* strip filename */
1562 while (*p && isspace(*++p)) /**/;
1565 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1566 but we should at least be resistant to it. */
1567 p = Ustrrchr(vname, ' ');
1568 result_tag = p ? p+1 : vname;
1570 if (Ustrcmp(result_tag, "FOUND") == 0) {
1571 /* p should still be the whitespace before the result_tag */
1572 while (isspace(*p)) --p;
1574 /* Strip off the extended information too, which will be in parens
1575 after the virus name, with no intervening whitespace. */
1577 /* "(hash:size)", so previous '(' will do; if not found, we have
1578 a curious virus name, but not an error. */
1579 p = Ustrrchr(vname, '(');
1583 malware_name_internal = string_copy(vname);
1584 malware_name = malware_name_internal;
1585 DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
1587 } else if (Ustrcmp(result_tag, "ERROR") == 0)
1588 return clmd_errlog_defer(
1589 string_sprintf("ClamAV returned: %s", av_buffer));
1591 else if (Ustrcmp(result_tag, "OK") == 0) {
1592 /* Everything should be OK */
1593 malware_name = NULL;
1594 DEBUG(D_acl) debug_printf("Malware not found\n");
1597 return clmd_errlog_defer(
1598 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1602 /* ----------------------------------------------------------------------- */
1605 /* "mksd" scanner type --------------------------------------------------- */
1606 else if (strcmpic(scanner_name, US"mksd") == 0) {
1607 uschar *mksd_options;
1608 char *mksd_options_end;
1609 int mksd_maxproc = 1; /* default, if no option supplied */
1610 struct sockaddr_un server;
1614 if ((mksd_options = string_nextinlist(&av_scanner_work, &sep,
1616 mksd_maxproc = (int) strtol(CS mksd_options, &mksd_options_end, 10);
1617 if ( *mksd_options == '\0'
1618 || *mksd_options_end != '\0'
1620 || mksd_maxproc > 32
1622 return mksd_errlog_defer(
1623 string_sprintf("invalid option '%s'", mksd_options));
1626 if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
1627 return mksd_errlog_defer(errstr);
1629 malware_name = NULL;
1631 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
1633 retval = mksd_scan_packed(sock, eml_filename);
1638 /* ----------------------------------------------------------------------- */
1640 /* "unknown" scanner type ------------------------------------------------- */
1642 return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
1644 /* ----------------------------------------------------------------------- */
1646 /* set "been here, done that" marker */
1650 /* match virus name against pattern (caseless ------->----------v) */
1651 if ( (malware_name != NULL) &&
1652 (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1653 DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
1661 /* simple wrapper for reading lines from sockets */
1663 recv_line(int sock, uschar *buffer, int size)
1667 memset(buffer,0,size);
1669 while(recv(sock,p,1,0) > -1) {
1670 if ((p-buffer) > (size-2)) break;
1671 if (*p == '\n') break;
1672 if (*p != '\r') p++;
1680 /* ============= private routines for the "mksd" scanner type ============== */
1682 #include <sys/uio.h>
1685 mksd_writev (int sock, struct iovec *iov, int iovcnt)
1691 i = writev (sock, iov, iovcnt);
1692 while ((i < 0) && (errno == EINTR));
1695 malware_errlog("unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1700 if (i >= iov->iov_len) {
1707 iov->iov_base = CS iov->iov_base + i;
1714 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1720 if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1722 malware_errlog("unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1727 /* offset == av_buffer_size -> buffer full */
1728 if (offset == av_buffer_size) {
1730 malware_errlog("malformed reply received from mksd");
1733 } while (av_buffer[offset-1] != '\n');
1735 av_buffer[offset] = '\0';
1740 mksd_parse_line (char *line)
1750 if ((p = strchr (line, '\n')) != NULL)
1752 return mksd_errlog_defer(string_sprintf("scanner failed: %s", line));
1755 if ((p = strchr (line, '\n')) != NULL) {
1757 if (((p-line) > 5) && (line[3] == ' '))
1758 if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1760 malware_name_internal = string_copy(line+4);
1761 malware_name = malware_name_internal;
1765 return mksd_errlog_defer(
1766 string_sprintf("malformed reply received from mksd: %s", line));
1771 mksd_scan_packed(int sock, uschar *scan_filename)
1773 struct iovec iov[3];
1774 const char *cmd = "MSQ\n";
1775 uschar av_buffer[1024];
1777 iov[0].iov_base = (void *) cmd;
1779 iov[1].iov_base = CS scan_filename;
1780 iov[1].iov_len = Ustrlen(scan_filename);
1781 iov[2].iov_base = (void *) (cmd + 3);
1784 if (mksd_writev (sock, iov, 3) < 0)
1787 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1792 return mksd_parse_line (CS av_buffer);
1795 #endif /*WITH_CONTENT_SCAN*/