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 BOOL malware_ok = FALSE;
67 /* Gross hacks for the -bmalware option; perhaps we should just create
68 the scan directory normally for that case, but look into rigging up the
69 needed header variables if not already set on the command-line? */
70 extern int spool_mbox_ok;
71 extern uschar spooled_message_id[17];
73 /*************************************************
74 * Scan an email for malware *
75 *************************************************/
77 /* This is the normal interface for scanning an email, which doesn't need a
78 filename; it's a wrapper around the malware_file function.
81 listptr the list of options to the "malware = ..." ACL condition
83 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
84 where true means malware was found (condition applies)
87 malware(uschar **listptr)
89 uschar * scan_filename;
92 scan_filename = string_sprintf("%s/scan/%s/%s.eml",
93 spool_directory, message_id, message_id);
94 ret = malware_internal(listptr, scan_filename, FALSE);
95 if (ret == DEFER) av_failed = TRUE;
101 /*************************************************
102 * Scan a file for malware *
103 *************************************************/
105 /* This is a test wrapper for scanning an email, which is not used in
106 normal processing. Scan any file, using the Exim scanning interface.
107 This function tampers with various global variables so is unsafe to use
108 in any other context.
111 eml_filename a file holding the message to be scanned
113 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
114 where true means malware was found (condition applies)
117 malware_in_file(uschar *eml_filename)
119 uschar *scan_options[2];
120 uschar message_id_buf[64];
123 scan_options[0] = US"*";
124 scan_options[1] = NULL;
126 /* spool_mbox() assumes various parameters exist, when creating
127 the relevant directory and the email within */
128 (void) string_format(message_id_buf, sizeof(message_id_buf),
129 "dummy-%d", vaguely_random_number(INT_MAX));
130 message_id = message_id_buf;
131 sender_address = US"malware-sender@example.net";
133 recipients_list = NULL;
134 receive_add_recipient(US"malware-victim@example.net", -1);
135 enable_dollar_recipients = TRUE;
137 ret = malware_internal(scan_options, eml_filename, TRUE);
139 Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id));
141 /* don't set no_mbox_unspool; at present, there's no way for it to become
142 set, but if that changes, then it should apply to these tests too */
145 /* silence static analysis tools */
153 malware_errlog(const uschar * str)
155 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
158 malware_errlog_defer(const uschar * str)
165 m_scanner_errlog_defer(const uschar * scanner, const uschar * str)
167 return malware_errlog_defer(string_sprintf("%s: %s", scanner, str));
171 fprotd_errlog_defer(const uschar * str)
173 return m_scanner_errlog_defer("f-protd", str);
176 drweb_errlog_defer(const uschar * str)
178 return m_scanner_errlog_defer("drweb", str);
181 aves_errlog_defer(const uschar * str)
183 return m_scanner_errlog_defer("aveserver", str);
186 fsec_errlog_defer(const uschar * str)
188 return m_scanner_errlog_defer("fsecure", str);
191 kavd_errlog_defer(const uschar * str)
193 return m_scanner_errlog_defer("kavdaemon", str);
196 cmdl_errlog_defer(const uschar * str)
198 return m_scanner_errlog_defer("commandline", str);
201 soph_errlog_defer(const uschar * str)
203 return m_scanner_errlog_defer("sophie", str);
206 clmd_errlog_defer(const uschar * str)
208 return m_scanner_errlog_defer("clamd", str);
211 mksd_errlog_defer(const uschar * str)
213 return m_scanner_errlog_defer("mksd", str);
216 sock_errlog_defer(const uschar * str)
218 return m_scanner_errlog_defer("sock", str);
222 clmd_errlog(const uschar * str)
224 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: clamd: %s", str);
227 /*************************************************/
229 /* Only used by the Clamav code, which is working from a list of servers and
230 uses the returned in_addr to get a second connection to the same system.
233 m_tcpsocket(const uschar * hostname, unsigned int port,
234 host_item * host, uschar ** errstr)
236 return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr);
240 m_tcpsocket_fromdef(const uschar * hostport, uschar ** errstr)
243 uschar hostname[256];
244 unsigned int portlow, porthigh;
246 /* extract host and port part */
247 scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh);
250 *errstr = string_sprintf("invalid socket '%s'", hostport);
256 return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh,
261 m_unixsocket(const uschar * path, uschar ** errstr)
264 struct sockaddr_un server;
266 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
267 *errstr = "can't open UNIX socket.";
271 server.sun_family = AF_UNIX;
272 Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1);
273 server.sun_path[sizeof(server.sun_path)-1] = '\0';
274 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
277 *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
278 path, strerror(err));
285 m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
287 if (send(sock, buf, cnt, 0) < 0) {
290 *errstr = string_sprintf("unable to send to socket (%s): %s",
298 m_pcre_compile(const uschar * re, uschar ** errstr)
300 const uschar * rerror;
304 cre = pcre_compile(re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
306 *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
307 re, rerror, roffset);
312 m_pcre_exec(const pcre * cre, uschar * text)
315 int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
316 ovector, nelements(ovector));
317 uschar * substr = NULL;
318 if (i >= 2) /* Got it */
319 pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
324 m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr)
326 const uschar * list_ele;
327 const pcre * cre = NULL;
329 if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
330 *errstr = US listerr;
332 cre = m_pcre_compile(CS list_ele, errstr);
336 /*************************************************
337 * Scan content for malware *
338 *************************************************/
340 typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL,
341 M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD} scanner_t;
346 const char * options_default;
349 { M_FPROTD, "f-protd", "localhost 10200-10204" },
350 { M_DRWEB, "drweb", "/usr/local/drweb/run/drwebd.sock" },
351 { M_AVES, "aveserver", "/var/run/aveserver" },
352 { M_FSEC, "fsecure", "/var/run/.fsav" },
353 { M_KAVD, "kavdaemon", "/var/run/AvpCtl" },
354 { M_CMDL, "cmdline", NULL },
355 { M_SOPHIE, "sophie", "/var/run/sophie" },
356 { M_CLAMD, "clamd", "/tmp/clamd" },
357 { M_SOCK, "sock", "/tmp/malware.sock" },
358 { M_MKSD, "mksd", NULL },
359 { -1, NULL, NULL } /* end-marker */
362 /* This is an internal interface for scanning an email; the normal interface
363 is via malware(), or there's malware_in_file() used for testing/debugging.
366 listptr the list of options to the "malware = ..." ACL condition
367 eml_filename the file holding the email to be scanned
368 faking whether or not we're faking this up for the -bmalware test
370 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
371 where true means malware was found (condition applies)
374 malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
377 uschar *list = *listptr;
378 uschar *av_scanner_work = av_scanner;
379 uschar *scanner_name;
380 uschar *malware_regex;
381 uschar malware_regex_default[] = ".+";
382 unsigned long mbox_size;
386 struct scan * scanent;
387 const uschar * scanner_options;
389 /* make sure the eml mbox file is spooled up */
390 if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL)))
391 return malware_errlog_defer("error while creating mbox spool file");
393 /* none of our current scanners need the mbox
394 file as a stream, so we can close it right away */
395 /*XXX drweb and clamd do!! */
396 (void)fclose(mbox_file);
398 /* extract the malware regex to match against from the option list */
399 if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0))) {
401 /* parse 1st option */
402 if ( (strcmpic(malware_regex,US"false") == 0) ||
403 (Ustrcmp(malware_regex,"0") == 0) )
404 return FAIL; /* explicitly no matching */
406 /* special cases (match anything except empty) */
407 if ( (strcmpic(malware_regex,US"true") == 0) ||
408 (Ustrcmp(malware_regex,"*") == 0) ||
409 (Ustrcmp(malware_regex,"1") == 0) )
410 malware_regex = malware_regex_default;
412 else /* empty means "don't match anything" */
415 /* Reset sep that is set by previous string_nextinlist() call */
418 /* compile the regex, see if it works */
419 if (!(re = m_pcre_compile(CS malware_regex, &errstr)))
420 return malware_errlog_defer(errstr);
422 /* if av_scanner starts with a dollar, expand it first */
423 if (*av_scanner == '$') {
424 if (!(av_scanner_work = expand_string(av_scanner)))
425 return malware_errlog_defer(
426 string_sprintf("av_scanner starts with $, but expansion failed: %s",
427 expand_string_message));
429 debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
430 /* disable result caching in this case */
435 /* Do not scan twice. */
438 /* find the scanner type from the av_scanner option */
439 if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
440 return malware_errlog_defer("av_scanner configuration variable is empty");
442 for (scanent = m_scans; ; scanent++) {
444 return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
446 if (strcmpic(scanner_name, US scanent->name) == 0)
449 if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
450 scanner_options = scanent->options_default;
452 switch (scanent->scancode) {
453 case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
455 uschar *fp_scan_option;
456 unsigned int detected=0, par_count=0;
458 uschar * scanrequest;
459 uschar buf[32768], *strhelper, *strhelper2;
460 uschar * malware_name_internal = NULL;
462 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
463 return fprotd_errlog_defer(errstr);
465 DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
466 scanrequest = string_sprintf("GET %s", eml_filename);
468 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
470 scanrequest = string_sprintf("%s%s%s", scanrequest,
471 par_count ? "%20" : "?", fp_scan_option);
474 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
476 /* send scan request */
477 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
478 return fprotd_errlog_defer(errstr);
480 /* We get a lot of empty lines, so we need this hack to check for any data at all */
481 while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
482 if ( recv_line(sock, buf, sizeof(buf)) > 0) {
483 if ( Ustrstr(buf, US"<detected type=\"") != NULL )
485 else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
486 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
488 malware_name_internal = string_copy(strhelper+6);
490 } else if ( Ustrstr(buf, US"<summary code=\"") )
491 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
492 ? malware_name_internal : NULL;
499 case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
500 /* v0.1 - added support for tcp sockets */
501 /* v0.0 - initial release -- support for unix sockets */
503 struct sockaddr_un server;
506 uschar * tmpbuf, *drweb_fbuf;
507 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
508 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
510 const pcre *drweb_re;
512 if (*scanner_options != '/') {
513 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
514 return drweb_errlog_defer(errstr);
516 /* prepare variables */
517 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
518 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
521 drweb_fd = open(CS eml_filename, O_RDONLY);
522 if (drweb_fd == -1) {
525 return drweb_errlog_defer(
526 string_sprintf("can't open spool file %s: %s",
527 eml_filename, strerror(err)));
529 fsize = lseek(drweb_fd, 0, SEEK_END);
533 (void)close(drweb_fd);
534 return drweb_errlog_defer(
535 string_sprintf("can't seek spool file %s: %s",
536 eml_filename, strerror(err)));
538 drweb_slen = htonl(fsize);
539 lseek(drweb_fd, 0, SEEK_SET);
541 DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n",
542 scanner_name, scanner_options);
544 /* send scan request */
545 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
546 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
547 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
548 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
550 (void)close(drweb_fd);
551 return drweb_errlog_defer(
552 string_sprintf("unable to send commands to socket (%s)", scanner_options));
555 drweb_fbuf = (uschar *) malloc (fsize);
558 (void)close(drweb_fd);
559 return drweb_errlog_defer(
560 string_sprintf("unable to allocate memory %u for file (%s)",
561 fsize, eml_filename));
564 result = read (drweb_fd, drweb_fbuf, fsize);
568 (void)close(drweb_fd);
570 return drweb_errlog_defer(
571 string_sprintf("can't read spool file %s: %s",
572 eml_filename, strerror(err)));
574 (void)close(drweb_fd);
576 /* send file body to socket */
577 if (send(sock, drweb_fbuf, fsize, 0) < 0) {
580 return drweb_errlog_defer(
581 string_sprintf("unable to send file body to socket (%s)", scanner_options));
583 (void)close(drweb_fd);
587 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
588 return drweb_errlog_defer(errstr);
590 /* prepare variables */
591 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
592 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
593 drweb_slen = htonl(Ustrlen(eml_filename));
595 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
596 scanner_name, scanner_options);
598 /* send scan request */
599 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
600 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
601 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
602 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
603 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) {
605 return drweb_errlog_defer(
606 string_sprintf("unable to send commands to socket (%s)", scanner_options));
610 /* wait for result */
611 if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) {
613 return drweb_errlog_defer("unable to read return code");
615 drweb_rc = ntohl(drweb_rc);
617 if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) {
619 return drweb_errlog_defer("unable to read the number of viruses");
621 drweb_vnum = ntohl(drweb_vnum);
623 /* "virus(es) found" if virus number is > 0 */
627 /* setup default virus name */
628 malware_name = "unknown";
630 /* set up match regex */
631 drweb_re = m_pcre_compile( "infected\\swith\\s*(.+?)$", &errstr);
633 /* read and concatenate virus names into one string */
634 for (i=0;i<drweb_vnum;i++)
636 int size = 0, off = 0, ovector[10*3];
637 /* read the size of report */
638 if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) {
640 return drweb_errlog_defer("cannot read report size");
642 drweb_slen = ntohl(drweb_slen);
643 tmpbuf = store_get(drweb_slen);
645 /* read report body */
646 if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) {
648 return drweb_errlog_defer("cannot read report string");
650 tmpbuf[drweb_slen] = '\0';
652 /* try matcher on the line, grab substring */
653 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
654 ovector, nelements(ovector));
656 const char * pre_malware_nb;
658 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
660 if (i==0) /* the first name we just copy to malware_name */
661 malware_name = string_append(NULL, &size, &off,
664 else /* concatenate each new virus name to previous */
665 malware_name = string_append(malware_name, &size, &off,
666 2, "/", pre_malware_nb);
668 pcre_free_substring(pre_malware_nb);
673 const char *drweb_s = NULL;
675 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
676 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
677 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
678 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
679 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
680 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
681 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
682 * and others are ignored */
685 return drweb_errlog_defer(
686 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s));
695 case M_AVES: /* "aveserver" scanner type -------------------------------- */
698 struct sockaddr_un server;
702 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
703 return aves_errlog_defer(errstr);
705 /* read aveserver's greeting and see if it is ready (2xx greeting) */
706 recv_line(sock, buf, sizeof(buf));
709 /* aveserver is having problems */
711 return aves_errlog_defer(
712 string_sprintf("unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
715 /* prepare our command */
716 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
719 DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
722 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
723 return aves_errlog_defer(errstr);
727 /* read response lines, find malware name and final response */
728 while (recv_line(sock, buf, sizeof(buf)) > 0) {
729 debug_printf("aveserver: %s\n", buf);
732 if (buf[0] == '5') { /* aveserver is having problems */
733 result = aves_errlog_defer(
734 string_sprintf("unable to scan file %s (Responded: %s).",
737 } else if (Ustrncmp(buf,"322",3) == 0) {
738 uschar *p = Ustrchr(&buf[4],' ');
740 malware_name = string_copy(&buf[4]);
745 if (m_sock_send(sock, "quit\r\n", 6, &errstr) < 0)
746 return aves_errlog_defer(errstr);
748 /* read aveserver's greeting and see if it is ready (2xx greeting) */
749 recv_line(sock, buf, sizeof(buf));
752 /* aveserver is having problems */
754 return aves_errlog_defer(
755 string_sprintf("unable to quit dialogue (Responded: %s).",
756 ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
761 if (result == DEFER) return DEFER;
765 case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
767 struct sockaddr_un server;
768 int sock, i, j, bread = 0;
770 uschar av_buffer[1024];
772 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
773 US"CONFIGURE\tTIMEOUT\t0\n",
774 US"CONFIGURE\tMAXARCH\t5\n",
775 US"CONFIGURE\tMIME\t1\n" };
779 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
780 return fsec_errlog_defer(errstr);
782 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
783 scanner_name, scanner_options);
786 memset(av_buffer, 0, sizeof(av_buffer));
787 for (i=0; i != nelements(cmdopt); i++) {
788 /* debug_printf("send option \"%s\"",cmdopt[i]); */
790 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
791 return fsec_errlog_defer(errstr);
793 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
794 if (bread >0) av_buffer[bread]='\0';
798 return fsec_errlog_defer(
799 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)));
801 for (j=0;j<bread;j++)
802 if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
804 /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
805 /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
808 /* pass the mailfile to fsecure */
809 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
811 /* debug_printf("send scan %s", file_name); */
812 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
813 return fsec_errlog_defer(errstr);
816 /* todo also SUSPICION\t */
817 fs_inf = m_pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr);
819 /* read report, linewise */
822 memset(av_buffer, 0, sizeof(av_buffer));
824 bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT);
828 return fsec_errlog_defer(
829 string_sprintf("unable to read result (%s)", strerror(err)));
833 while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n'));
834 av_buffer[i-1] = '\0';
835 /* debug_printf("got line \"%s\"\n",av_buffer); */
837 /* Really search for virus again? */
838 if (malware_name == NULL)
839 /* try matcher on the line, grab substring */
840 malware_name = m_pcre_exec(fs_inf, av_buffer);
842 while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
847 case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
849 struct sockaddr_un server;
853 uschar * scanrequest;
855 unsigned long kav_reportlen, bread;
859 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
860 return kavd_errlog_defer(errstr);
862 /* get current date and time, build scan request */
864 /* pdp note: before the eml_filename parameter, this scanned the
865 directory; not finding documentation, so we'll strip off the directory.
866 The side-effect is that the test framework scanning may end up in
867 scanning more than was requested, but for the normal interface, this is
869 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
870 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
871 p = Ustrrchr(scanrequest, '/');
875 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
876 scanner_name, scanner_options);
878 /* send scan request */
879 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
880 return kavd_errlog_defer(errstr);
882 /* wait for result */
883 if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) {
885 return kavd_errlog_defer("unable to read 2 bytes from socket.");
888 /* get errorcode from one nibble */
889 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
891 /* improper kavdaemon configuration */
892 if ( (kav_rc == 5) || (kav_rc == 6) ) {
894 return kavd_errlog_defer("please reconfigure kavdaemon to NOT disinfect or remove infected files.");
899 return kavd_errlog_defer("reported 'scanning not completed' (code 1).");
904 return kavd_errlog_defer("reported 'kavdaemon damaged' (code 7).");
907 /* code 8 is not handled, since it is ambigous. It appears mostly on
908 bounces where part of a file has been cut off */
910 /* "virus found" return codes (2-4) */
911 if ((kav_rc > 1) && (kav_rc < 5)) {
914 /* setup default virus name */
915 malware_name = "unknown";
917 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
919 /* read the report, if available */
920 if( report_flag == 1 ) {
921 /* read report size */
922 if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) {
924 return kavd_errlog_defer("cannot read report size");
927 /* it's possible that avp returns av_buffer[1] == 1 but the
928 reportsize is 0 (!?) */
929 if (kav_reportlen > 0) {
930 /* set up match regex, depends on retcode */
931 kav_re = m_pcre_compile( kav_rc == 3
932 ? "suspicion:\\s*(.+?)\\s*$"
933 : "infected:\\s*(.+?)\\s*$",
936 /* read report, linewise */
937 while (kav_reportlen > 0) {
939 while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
941 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
945 tmpbuf[bread] = '\0';
947 /* try matcher on the line, grab substring */
948 if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
954 else /* no virus found */
961 case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
963 const uschar *cmdline_scanner = scanner_options;
964 const pcre *cmdline_trigger_re;
965 const pcre *cmdline_regex_re;
967 uschar * commandline;
968 void (*eximsigchld)(int);
969 void (*eximsigpipe)(int);
970 FILE *scanner_out = NULL;
971 FILE *scanner_record = NULL;
972 uschar linebuffer[32767];
977 if (!cmdline_scanner)
978 return cmdl_errlog_defer("missing commandline specification");
980 /* find scanner output trigger */
981 cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
982 "missing trigger specification", &errstr);
983 if (!cmdline_trigger_re)
984 return cmdl_errlog_defer(errstr);
986 /* find scanner name regex */
987 cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
988 "missing virus name regex specification", &errstr);
989 if (!cmdline_regex_re)
990 return cmdl_errlog_defer(errstr);
992 /* prepare scanner call; despite the naming, file_name holds a directory
993 name which is documented as the value given to %s. */
995 file_name = string_copy(eml_filename);
996 p = Ustrrchr(file_name, '/');
999 commandline = string_sprintf(CS cmdline_scanner, file_name);
1001 /* redirect STDERR too */
1002 commandline = string_sprintf("%s 2>&1", commandline);
1004 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
1006 /* store exims signal handlers */
1007 eximsigchld = signal(SIGCHLD,SIG_DFL);
1008 eximsigpipe = signal(SIGPIPE,SIG_DFL);
1010 scanner_out = popen(CS commandline,"r");
1011 if (scanner_out == NULL) {
1013 signal(SIGCHLD,eximsigchld);
1014 signal(SIGPIPE,eximsigpipe);
1015 return cmdl_errlog_defer(
1016 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
1019 file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
1020 spool_directory, message_id, message_id);
1021 scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
1023 if (scanner_record == NULL) {
1025 pclose(scanner_out);
1026 signal(SIGCHLD,eximsigchld);
1027 signal(SIGPIPE,eximsigpipe);
1028 return cmdl_errlog_defer(
1029 string_sprintf("opening scanner output file (%s) failed: %s.",
1030 file_name, strerror(err)));
1033 /* look for trigger while recording output */
1034 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) {
1035 if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
1037 pclose(scanner_out);
1038 signal(SIGCHLD,eximsigchld);
1039 signal(SIGPIPE,eximsigpipe);
1040 return cmdl_errlog_defer(
1041 string_sprintf("short write on scanner output file (%s).", file_name));
1043 /* try trigger match */
1044 if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
1048 (void)fclose(scanner_record);
1049 pclose(scanner_out);
1050 signal(SIGCHLD,eximsigchld);
1051 signal(SIGPIPE,eximsigpipe);
1055 /* setup default virus name */
1056 malware_name = US"unknown";
1058 /* re-open the scanner output file, look for name match */
1059 scanner_record = fopen(CS file_name, "rb");
1060 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) {
1062 if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
1065 (void)fclose(scanner_record);
1067 else /* no virus found */
1068 malware_name = NULL;
1072 case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
1075 struct sockaddr_un server;
1079 uschar av_buffer[1024];
1081 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1082 return soph_errlog_defer(errstr);
1084 /* pass the scan directory to sophie */
1085 file_name = string_copy(eml_filename);
1086 if ((p = Ustrrchr(file_name, '/')))
1089 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
1090 scanner_name, scanner_options);
1092 if ( write(sock, file_name, Ustrlen(file_name)) < 0
1093 || write(sock, "\n", 1) != 1
1096 return soph_errlog_defer(
1097 string_sprintf("unable to write to UNIX socket (%s)", scanner_options));
1100 /* wait for result */
1101 memset(av_buffer, 0, sizeof(av_buffer));
1102 if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) {
1104 return soph_errlog_defer(
1105 string_sprintf("unable to read from UNIX socket (%s)", scanner_options));
1111 if (av_buffer[0] == '1') {
1112 uschar * s = Ustrchr(av_buffer, '\n');
1115 malware_name = string_copy(&av_buffer[2]);
1117 else if (!strncmp(CS av_buffer, "-1", 2))
1118 return soph_errlog_defer("scanner reported error");
1119 else /* all ok, no virus */
1120 malware_name = NULL;
1124 case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
1126 /* This code was originally contributed by David Saez */
1127 /* There are three scanning methods available to us:
1128 * (1) Use the SCAN command, pointing to a file in the filesystem
1129 * (2) Use the STREAM command, send the data on a separate port
1130 * (3) Use the zINSTREAM command, send the data inline
1131 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1132 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1133 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1134 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
1135 * WITH_OLD_CLAMAV_STREAM is defined.
1136 * See Exim bug 926 for details. */
1138 uschar *p, *vname, *result_tag, *response_end;
1139 struct sockaddr_un server;
1143 uschar av_buffer[1024];
1144 uschar *hostname = "";
1146 uschar *clamav_fbuf;
1147 int clam_fd, result;
1149 BOOL use_scan_command = FALSE;
1150 clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
1152 int num_servers = 0;
1153 #ifdef WITH_OLD_CLAMAV_STREAM
1154 uschar av_buffer2[1024];
1157 uint32_t send_size, send_final_zeroblock;
1160 if (*scanner_options == '/')
1161 /* Local file; so we def want to use_scan_command and don't want to try
1162 * passing IP/port combinations */
1163 use_scan_command = TRUE;
1165 const uschar *address = scanner_options;
1166 uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
1168 /* Go through the rest of the list of host/port and construct an array
1169 * of servers to try. The first one is the bit we just passed from
1170 * scanner_options so process that first and then scan the remainder of
1171 * the address buffer */
1173 clamd_address_container *this_clamd;
1175 /* The 'local' option means use the SCAN command over the network
1176 * socket (ie common file storage in use) */
1177 if (strcmpic(address,US"local") == 0) {
1178 use_scan_command = TRUE;
1182 /* XXX: If unsuccessful we should free this memory */
1184 (clamd_address_container *)store_get(sizeof(clamd_address_container));
1186 /* extract host and port part */
1187 if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
1188 this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
1189 clmd_errlog(string_sprintf("invalid address '%s'", address));
1193 clamd_address_vector[num_servers] = this_clamd;
1195 if (num_servers >= MAX_CLAMD_SERVERS) {
1196 clmd_errlog("More than " MAX_CLAMD_SERVERS_S " clamd servers "
1197 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1200 } while ((address = string_nextinlist(&av_scanner_work, &sep,
1202 sizeof(address_buffer))) != NULL);
1204 /* check if we have at least one server */
1206 return clmd_errlog_defer("no useable server addresses in malware configuration option.");
1209 /* See the discussion of response formats below to see why we really don't
1210 like colons in filenames when passing filenames to ClamAV. */
1211 if (use_scan_command && Ustrchr(eml_filename, ':'))
1212 return clmd_errlog_defer(
1213 string_sprintf("local/SCAN mode incompatible with" \
1214 " : in path to email filename [%s]", eml_filename));
1216 /* We have some network servers specified */
1219 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1220 * only supports AF_INET, but we should probably be looking to the
1221 * future and rewriting this to be protocol-independent anyway. */
1223 while ( num_servers > 0 ) {
1224 /* Randomly pick a server to start with */
1225 current_server = random_number( num_servers );
1227 debug_printf("trying server name %s, port %u\n",
1228 clamd_address_vector[current_server]->tcp_addr,
1229 clamd_address_vector[current_server]->tcp_port);
1231 /* Lookup the host. This is to ensure that we connect to the same IP
1232 * on both connections (as one host could resolve to multiple ips) */
1233 sock= m_tcpsocket(CS clamd_address_vector[current_server]->tcp_addr,
1234 clamd_address_vector[current_server]->tcp_port,
1235 &connhost, &errstr);
1237 /* Connection successfully established with a server */
1238 hostname = clamd_address_vector[current_server]->tcp_addr;
1242 clmd_errlog(errstr);
1244 /* Remove the server from the list. XXX We should free the memory */
1247 for( i = current_server; i < num_servers; i++ )
1248 clamd_address_vector[i] = clamd_address_vector[i+1];
1251 if ( num_servers == 0 )
1252 return clmd_errlog_defer("all servers failed");
1255 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1256 return clmd_errlog_defer(errstr);
1259 /* have socket in variable "sock"; command to use is semi-independent of
1260 * the socket protocol. We use SCAN if is local (either Unix/local
1261 * domain socket, or explicitly told local) else we stream the data.
1262 * How we stream the data depends upon how we were built. */
1264 if (!use_scan_command) {
1266 #ifdef WITH_OLD_CLAMAV_STREAM
1267 /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
1268 * that port on a second connection; then in the scan-method-neutral
1269 * part, read the response back on the original connection. */
1271 DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
1274 /* Pass the string to ClamAV (7 = "STREAM\n") */
1275 if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0)
1276 return clmd_errlog_defer(errstr);
1278 memset(av_buffer2, 0, sizeof(av_buffer2));
1279 bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1284 return clmd_errlog_defer(
1285 string_sprintf("unable to read PORT from socket (%s)",
1289 if (bread == sizeof(av_buffer2)) {
1291 return clmd_errlog_defer("buffer too small");
1294 if (!(*av_buffer2)) {
1296 return clmd_errlog_defer("ClamAV returned null");
1299 av_buffer2[bread] = '\0';
1300 if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) {
1302 return clmd_errlog_defer(
1303 string_sprintf("Expected port information from clamd, got '%s'",
1307 sockData = m_tcpsocket(connhost.address, port, NULL, &errstr);
1310 return clmd_errlog_defer(errstr);
1313 #define CLOSE_SOCKDATA (void)close(sockData)
1314 #else /* WITH_OLD_CLAMAV_STREAM not defined */
1315 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1316 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1319 DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1322 /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
1323 if (send(sock, "zINSTREAM", 10, 0) < 0) {
1326 return clmd_errlog_defer(
1327 string_sprintf("unable to send zINSTREAM to socket (%s)",
1331 #define CLOSE_SOCKDATA /**/
1334 /* calc file size */
1335 clam_fd = open(CS eml_filename, O_RDONLY);
1336 if (clam_fd == -1) {
1338 CLOSE_SOCKDATA; (void)close(sock);
1339 return clmd_errlog_defer(
1340 string_sprintf("can't open spool file %s: %s",
1341 eml_filename, strerror(err)));
1343 fsize = lseek(clam_fd, 0, SEEK_END);
1346 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1347 return clmd_errlog_defer(
1348 string_sprintf("can't seek spool file %s: %s",
1349 eml_filename, strerror(errno)));
1351 lseek(clam_fd, 0, SEEK_SET);
1353 clamav_fbuf = (uschar *) malloc (fsize);
1355 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1356 return clmd_errlog_defer(
1357 string_sprintf("unable to allocate memory %u for file (%s)",
1358 fsize, eml_filename));
1361 result = read (clam_fd, clamav_fbuf, fsize);
1364 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1366 return clmd_errlog_defer(
1367 string_sprintf("can't read spool file %s: %s",
1368 eml_filename, strerror(err)));
1370 (void)close(clam_fd);
1372 /* send file body to socket */
1373 #ifdef WITH_OLD_CLAMAV_STREAM
1374 if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1375 CLOSE_SOCKDATA; (void)close(sock);
1377 return clmd_errlog_defer(
1378 string_sprintf("unable to send file body to socket (%s:%u)",
1382 send_size = htonl(fsize);
1383 send_final_zeroblock = 0;
1384 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1385 (send(sock, clamav_fbuf, fsize, 0) < 0) ||
1386 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1390 return clmd_errlog_defer(
1391 string_sprintf("unable to send file body to socket (%s:%u)",
1399 #undef CLOSE_SOCKDATA
1401 } else { /* use scan command */
1402 /* Send a SCAN command pointing to a filename; then in the then in the
1403 * scan-method-neutral part, read the response back */
1405 /* ================================================================= */
1407 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1408 which dates to when ClamAV needed us to break apart the email into the
1409 MIME parts (eg, with the now deprecated demime condition coming first).
1410 Some time back, ClamAV gained the ability to deconstruct the emails, so
1411 doing this would actually have resulted in the mail attachments being
1412 scanned twice, in the broken out files and from the original .eml.
1413 Since ClamAV now handles emails (and has for quite some time) we can
1414 just use the email file itself. */
1415 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1416 file_name = string_sprintf("SCAN %s\n", eml_filename);
1418 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
1419 scanner_name, scanner_options);
1421 if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
1424 return clmd_errlog_defer(
1425 string_sprintf("unable to write to socket (%s)", strerror(err)));
1428 /* Do not shut down the socket for writing; a user report noted that
1429 * clamd 0.70 does not react well to this. */
1431 /* Commands have been sent, no matter which scan method or connection
1432 * type we're using; now just read the result, independent of method. */
1434 /* Read the result */
1435 memset(av_buffer, 0, sizeof(av_buffer));
1436 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1440 return clmd_errlog_defer(
1441 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1443 if (bread == sizeof(av_buffer))
1444 return clmd_errlog_defer("buffer too small");
1445 /* We're now assured of a NULL at the end of av_buffer */
1447 /* Check the result. ClamAV returns one of two result formats.
1448 In the basic mode, the response is of the form:
1449 infected: -> "<filename>: <virusname> FOUND"
1450 not-infected: -> "<filename>: OK"
1451 error: -> "<filename>: <errcode> ERROR
1452 If the ExtendedDetectionInfo option has been turned on, then we get:
1453 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1454 for the infected case. Compare:
1455 /tmp/eicar.com: Eicar-Test-Signature FOUND
1456 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1458 In the streaming case, clamd uses the filename "stream" which you should
1459 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1460 client app will replace "stream" with the original filename before returning
1461 results to stdout, but the trace shows the data).
1463 We will assume that the pathname passed to clamd from Exim does not contain
1464 a colon. We will have whined loudly above if the eml_filename does (and we're
1465 passing a filename to clamd). */
1468 return clmd_errlog_defer("ClamAV returned null");
1470 /* strip newline at the end (won't be present for zINSTREAM)
1471 (also any trailing whitespace, which shouldn't exist, but we depend upon
1472 this below, so double-check) */
1473 p = av_buffer + Ustrlen(av_buffer) - 1;
1474 if (*p == '\n') *p = '\0';
1476 DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
1478 while (isspace(*--p) && (p > av_buffer))
1483 /* colon in returned output? */
1484 if((p = Ustrchr(av_buffer,':')) == NULL)
1485 return clmd_errlog_defer(
1486 string_sprintf("ClamAV returned malformed result (missing colon): %s",
1489 /* strip filename */
1490 while (*p && isspace(*++p)) /**/;
1493 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1494 but we should at least be resistant to it. */
1495 p = Ustrrchr(vname, ' ');
1496 result_tag = p ? p+1 : vname;
1498 if (Ustrcmp(result_tag, "FOUND") == 0) {
1499 /* p should still be the whitespace before the result_tag */
1500 while (isspace(*p)) --p;
1502 /* Strip off the extended information too, which will be in parens
1503 after the virus name, with no intervening whitespace. */
1505 /* "(hash:size)", so previous '(' will do; if not found, we have
1506 a curious virus name, but not an error. */
1507 p = Ustrrchr(vname, '(');
1511 malware_name = string_copy(vname);
1512 DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
1514 } else if (Ustrcmp(result_tag, "ERROR") == 0)
1515 return clmd_errlog_defer(
1516 string_sprintf("ClamAV returned: %s", av_buffer));
1518 else if (Ustrcmp(result_tag, "OK") == 0) {
1519 /* Everything should be OK */
1520 malware_name = NULL;
1521 DEBUG(D_acl) debug_printf("Malware not found\n");
1524 return clmd_errlog_defer(
1525 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1530 case M_SOCK: /* "sock" scanner type ------------------------------------- */
1531 /* This code was derived by Martin Poole from the clamd code contributed
1532 by David Saez and the cmdline code
1536 uschar * commandline;
1537 uschar av_buffer[1024];
1538 uschar * linebuffer;
1539 uschar * sockline_scanner;
1540 uschar sockline_scanner_default[] = "%s\n";
1541 const pcre *sockline_trig_re;
1542 const pcre *sockline_name_re;
1545 /* find scanner command line */
1546 if ((sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
1548 { /* check for no expansions apart from one %s */
1549 char * s = index(sockline_scanner, '%');
1551 if (*s != 's' && *s != '%' || index(s+1, '%'))
1552 return sock_errlog_defer("unsafe sock scanner call spec");
1555 sockline_scanner = sockline_scanner_default;
1557 /* find scanner output trigger */
1558 sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1559 "missing trigger specification", &errstr);
1560 if (!sockline_trig_re)
1561 return sock_errlog_defer(errstr);
1563 /* find virus name regex */
1564 sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1565 "missing virus name regex specification", &errstr);
1566 if (!sockline_name_re)
1567 return sock_errlog_defer(errstr);
1569 /* prepare scanner call - security depends on expansions check above */
1570 commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
1571 commandline = string_sprintf( CS sockline_scanner, CS commandline);
1574 /* socket does not start with '/' -> network socket */
1575 sock = *scanner_options != '/'
1576 ? m_tcpsocket_fromdef(scanner_options, &errstr)
1577 : m_unixsocket(scanner_options, &errstr);
1579 return sock_errlog_defer(errstr);
1581 /* Pass the command string to the socket */
1582 if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
1583 return sock_errlog_defer(errstr);
1585 /* Read the result */
1586 memset(av_buffer, 0, sizeof(av_buffer));
1587 bread = read(sock, av_buffer, sizeof(av_buffer));
1592 return sock_errlog_defer(
1593 string_sprintf("unable to read from socket (%s)", strerror(err)));
1595 if (bread == sizeof(av_buffer))
1596 return sock_errlog_defer("buffer too small");
1597 linebuffer = string_copy(av_buffer);
1599 /* try trigger match */
1600 if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) {
1601 if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
1602 malware_name = US "unknown";
1604 else /* no virus found */
1605 malware_name = NULL;
1608 case M_MKSD: /* "mksd" scanner type ------------------------------------- */
1610 char *mksd_options_end;
1611 int mksd_maxproc = 1; /* default, if no option supplied */
1615 if (scanner_options) {
1616 mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
1617 if ( *scanner_options == '\0'
1618 || *mksd_options_end != '\0'
1620 || mksd_maxproc > 32
1622 return mksd_errlog_defer(
1623 string_sprintf("invalid option '%s'", scanner_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);
1641 malware_ok = TRUE; /* set "been here, done that" marker */
1644 /* match virus name against pattern (caseless ------->----------v) */
1645 if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1646 DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
1654 /* simple wrapper for reading lines from sockets */
1656 recv_line(int sock, uschar *buffer, int size)
1660 memset(buffer,0,size);
1662 while(recv(sock,p,1,0) > -1) {
1663 if ((p-buffer) > (size-2)) break;
1664 if (*p == '\n') break;
1665 if (*p != '\r') p++;
1673 /* ============= private routines for the "mksd" scanner type ============== */
1675 #include <sys/uio.h>
1678 mksd_writev (int sock, struct iovec *iov, int iovcnt)
1684 i = writev (sock, iov, iovcnt);
1685 while ((i < 0) && (errno == EINTR));
1688 malware_errlog("unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1693 if (i >= iov->iov_len) {
1700 iov->iov_base = CS iov->iov_base + i;
1707 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1713 if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1715 malware_errlog("unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1720 /* offset == av_buffer_size -> buffer full */
1721 if (offset == av_buffer_size) {
1723 malware_errlog("malformed reply received from mksd");
1726 } while (av_buffer[offset-1] != '\n');
1728 av_buffer[offset] = '\0';
1733 mksd_parse_line (char *line)
1743 if ((p = strchr (line, '\n')) != NULL)
1745 return mksd_errlog_defer(string_sprintf("scanner failed: %s", line));
1748 if ((p = strchr (line, '\n')) != NULL) {
1750 if (((p-line) > 5) && (line[3] == ' '))
1751 if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1753 malware_name = string_copy(line+4);
1757 return mksd_errlog_defer(
1758 string_sprintf("malformed reply received from mksd: %s", line));
1763 mksd_scan_packed(int sock, uschar *scan_filename)
1765 struct iovec iov[3];
1766 const char *cmd = "MSQ\n";
1767 uschar av_buffer[1024];
1769 iov[0].iov_base = (void *) cmd;
1771 iov[1].iov_base = CS scan_filename;
1772 iov[1].iov_len = Ustrlen(scan_filename);
1773 iov[2].iov_base = (void *) (cmd + 3);
1776 if (mksd_writev (sock, iov, 3) < 0)
1779 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1784 return mksd_parse_line (CS av_buffer);
1787 #endif /*WITH_CONTENT_SCAN*/