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 Ustrcpy(server.sun_path, path);
273 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
276 *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
277 path, strerror(err));
284 m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
286 if (send(sock, buf, cnt, 0) < 0) {
289 *errstr = string_sprintf("unable to send to socket (%s): %s",
297 m_pcre_compile(const uschar * re, uschar ** errstr)
299 const uschar * rerror;
303 cre = pcre_compile(re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
305 *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
306 re, rerror, roffset);
311 m_pcre_exec(const pcre * cre, uschar * text)
314 int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
315 ovector, nelements(ovector));
316 uschar * substr = NULL;
317 if (i >= 2) /* Got it */
318 pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
323 m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr)
325 const uschar * list_ele;
326 const pcre * cre = NULL;
328 if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
329 *errstr = US listerr;
331 cre = m_pcre_compile(CS list_ele, errstr);
335 /*************************************************
336 * Scan content for malware *
337 *************************************************/
339 typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL,
340 M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD} scanner_t;
345 const char * options_default;
348 { M_FPROTD, "f-protd", "localhost 10200-10204" },
349 { M_DRWEB, "drweb", "/usr/local/drweb/run/drwebd.sock" },
350 { M_AVES, "aveserver", "/var/run/aveserver" },
351 { M_FSEC, "fsecure", "/var/run/.fsav" },
352 { M_KAVD, "kavdaemon", "/var/run/AvpCtl" },
353 { M_CMDL, "cmdline", NULL },
354 { M_SOPHIE, "sophie", "/var/run/sophie" },
355 { M_CLAMD, "clamd", "/tmp/clamd" },
356 { M_SOCK, "sock", "/tmp/malware.sock" },
357 { M_MKSD, "mksd", NULL },
358 { -1, NULL, NULL } /* end-marker */
361 /* This is an internal interface for scanning an email; the normal interface
362 is via malware(), or there's malware_in_file() used for testing/debugging.
365 listptr the list of options to the "malware = ..." ACL condition
366 eml_filename the file holding the email to be scanned
367 faking whether or not we're faking this up for the -bmalware test
369 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
370 where true means malware was found (condition applies)
373 malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
376 uschar *list = *listptr;
377 uschar *av_scanner_work = av_scanner;
378 uschar *scanner_name;
379 uschar *malware_regex;
380 uschar malware_regex_default[] = ".+";
381 unsigned long mbox_size;
385 struct scan * scanent;
386 const uschar * scanner_options;
388 /* make sure the eml mbox file is spooled up */
389 if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL)))
390 return malware_errlog_defer("error while creating mbox spool file");
392 /* none of our current scanners need the mbox
393 file as a stream, so we can close it right away */
394 /*XXX drweb and clamd do!! */
395 (void)fclose(mbox_file);
397 /* extract the malware regex to match against from the option list */
398 if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0))) {
400 /* parse 1st option */
401 if ( (strcmpic(malware_regex,US"false") == 0) ||
402 (Ustrcmp(malware_regex,"0") == 0) )
403 return FAIL; /* explicitly no matching */
405 /* special cases (match anything except empty) */
406 if ( (strcmpic(malware_regex,US"true") == 0) ||
407 (Ustrcmp(malware_regex,"*") == 0) ||
408 (Ustrcmp(malware_regex,"1") == 0) )
409 malware_regex = malware_regex_default;
411 else /* empty means "don't match anything" */
414 /* Reset sep that is set by previous string_nextinlist() call */
417 /* compile the regex, see if it works */
418 if (!(re = m_pcre_compile(CS malware_regex, &errstr)))
419 return malware_errlog_defer(errstr);
421 /* if av_scanner starts with a dollar, expand it first */
422 if (*av_scanner == '$') {
423 if (!(av_scanner_work = expand_string(av_scanner)))
424 return malware_errlog_defer(
425 string_sprintf("av_scanner starts with $, but expansion failed: %s",
426 expand_string_message));
428 debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
429 /* disable result caching in this case */
434 /* Do not scan twice. */
437 /* find the scanner type from the av_scanner option */
438 if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
439 return malware_errlog_defer("av_scanner configuration variable is empty");
441 for (scanent = m_scans; ; scanent++) {
443 return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
445 if (strcmpic(scanner_name, US scanent->name) == 0)
448 if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
449 scanner_options = scanent->options_default;
451 switch (scanent->scancode) {
452 case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
454 uschar *fp_scan_option;
455 unsigned int detected=0, par_count=0;
457 uschar * scanrequest;
458 uschar buf[32768], *strhelper, *strhelper2;
459 uschar * malware_name_internal = NULL;
461 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
462 return fprotd_errlog_defer(errstr);
464 DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
465 scanrequest = string_sprintf("GET %s", eml_filename);
467 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
469 scanrequest = string_sprintf("%s%s%s", scanrequest,
470 par_count ? "%20" : "?", fp_scan_option);
473 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
475 /* send scan request */
476 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
477 return fprotd_errlog_defer(errstr);
479 /* We get a lot of empty lines, so we need this hack to check for any data at all */
480 while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
481 if ( recv_line(sock, buf, sizeof(buf)) > 0) {
482 if ( Ustrstr(buf, US"<detected type=\"") != NULL )
484 else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
485 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
487 malware_name_internal = string_copy(strhelper+6);
489 } else if ( Ustrstr(buf, US"<summary code=\"") )
490 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
491 ? malware_name_internal : NULL;
498 case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
499 /* v0.1 - added support for tcp sockets */
500 /* v0.0 - initial release -- support for unix sockets */
502 struct sockaddr_un server;
505 uschar * tmpbuf, *drweb_fbuf;
506 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
507 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
509 const pcre *drweb_re;
511 if (*scanner_options != '/') {
512 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
513 return drweb_errlog_defer(errstr);
515 /* prepare variables */
516 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
517 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
520 drweb_fd = open(CS eml_filename, O_RDONLY);
521 if (drweb_fd == -1) {
524 return drweb_errlog_defer(
525 string_sprintf("can't open spool file %s: %s",
526 eml_filename, strerror(err)));
528 fsize = lseek(drweb_fd, 0, SEEK_END);
532 (void)close(drweb_fd);
533 return drweb_errlog_defer(
534 string_sprintf("can't seek spool file %s: %s",
535 eml_filename, strerror(err)));
537 drweb_slen = htonl(fsize);
538 lseek(drweb_fd, 0, SEEK_SET);
540 DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n",
541 scanner_name, scanner_options);
543 /* send scan request */
544 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
545 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
546 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
547 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
549 (void)close(drweb_fd);
550 return drweb_errlog_defer(
551 string_sprintf("unable to send commands to socket (%s)", scanner_options));
554 drweb_fbuf = (uschar *) malloc (fsize);
557 (void)close(drweb_fd);
558 return drweb_errlog_defer(
559 string_sprintf("unable to allocate memory %u for file (%s)",
560 fsize, eml_filename));
563 result = read (drweb_fd, drweb_fbuf, fsize);
567 (void)close(drweb_fd);
569 return drweb_errlog_defer(
570 string_sprintf("can't read spool file %s: %s",
571 eml_filename, strerror(err)));
573 (void)close(drweb_fd);
575 /* send file body to socket */
576 if (send(sock, drweb_fbuf, fsize, 0) < 0) {
579 return drweb_errlog_defer(
580 string_sprintf("unable to send file body to socket (%s)", scanner_options));
582 (void)close(drweb_fd);
586 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
587 return drweb_errlog_defer(errstr);
589 /* prepare variables */
590 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
591 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
592 drweb_slen = htonl(Ustrlen(eml_filename));
594 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
595 scanner_name, scanner_options);
597 /* send scan request */
598 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
599 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
600 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
601 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
602 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) {
604 return drweb_errlog_defer(
605 string_sprintf("unable to send commands to socket (%s)", scanner_options));
609 /* wait for result */
610 if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) {
612 return drweb_errlog_defer("unable to read return code");
614 drweb_rc = ntohl(drweb_rc);
616 if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) {
618 return drweb_errlog_defer("unable to read the number of viruses");
620 drweb_vnum = ntohl(drweb_vnum);
622 /* "virus(es) found" if virus number is > 0 */
626 /* setup default virus name */
627 malware_name = "unknown";
629 /* set up match regex */
630 drweb_re = m_pcre_compile( "infected\\swith\\s*(.+?)$", &errstr);
632 /* read and concatenate virus names into one string */
633 for (i=0;i<drweb_vnum;i++)
635 int size = 0, off = 0, ovector[10*3];
636 /* read the size of report */
637 if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) {
639 return drweb_errlog_defer("cannot read report size");
641 drweb_slen = ntohl(drweb_slen);
642 tmpbuf = store_get(drweb_slen);
644 /* read report body */
645 if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) {
647 return drweb_errlog_defer("cannot read report string");
649 tmpbuf[drweb_slen] = '\0';
651 /* try matcher on the line, grab substring */
652 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
653 ovector, nelements(ovector));
655 const char * pre_malware_nb;
657 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
659 if (i==0) /* the first name we just copy to malware_name */
660 malware_name = string_append(NULL, &size, &off,
663 else /* concatenate each new virus name to previous */
664 malware_name = string_append(malware_name, &size, &off,
665 2, "/", pre_malware_nb);
667 pcre_free_substring(pre_malware_nb);
672 const char *drweb_s = NULL;
674 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
675 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
676 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
677 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
678 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
679 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
680 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
681 * and others are ignored */
684 return drweb_errlog_defer(
685 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s));
694 case M_AVES: /* "aveserver" scanner type -------------------------------- */
697 struct sockaddr_un server;
701 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
702 return aves_errlog_defer(errstr);
704 /* read aveserver's greeting and see if it is ready (2xx greeting) */
705 recv_line(sock, buf, sizeof(buf));
708 /* aveserver is having problems */
710 return aves_errlog_defer(
711 string_sprintf("unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
714 /* prepare our command */
715 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
718 DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
721 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
722 return aves_errlog_defer(errstr);
726 /* read response lines, find malware name and final response */
727 while (recv_line(sock, buf, sizeof(buf)) > 0) {
728 debug_printf("aveserver: %s\n", buf);
731 if (buf[0] == '5') { /* aveserver is having problems */
732 result = aves_errlog_defer(
733 string_sprintf("unable to scan file %s (Responded: %s).",
736 } else if (Ustrncmp(buf,"322",3) == 0) {
737 uschar *p = Ustrchr(&buf[4],' ');
739 malware_name = string_copy(&buf[4]);
744 if (m_sock_send(sock, "quit\r\n", 6, &errstr) < 0)
745 return aves_errlog_defer(errstr);
747 /* read aveserver's greeting and see if it is ready (2xx greeting) */
748 recv_line(sock, buf, sizeof(buf));
751 /* aveserver is having problems */
753 return aves_errlog_defer(
754 string_sprintf("unable to quit dialogue (Responded: %s).",
755 ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
760 if (result == DEFER) return DEFER;
764 case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
766 struct sockaddr_un server;
767 int sock, i, j, bread = 0;
769 uschar av_buffer[1024];
771 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
772 US"CONFIGURE\tTIMEOUT\t0\n",
773 US"CONFIGURE\tMAXARCH\t5\n",
774 US"CONFIGURE\tMIME\t1\n" };
778 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
779 return fsec_errlog_defer(errstr);
781 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
782 scanner_name, scanner_options);
785 memset(av_buffer, 0, sizeof(av_buffer));
786 for (i=0; i != nelements(cmdopt); i++) {
787 /* debug_printf("send option \"%s\"",cmdopt[i]); */
789 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
790 return fsec_errlog_defer(errstr);
792 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
793 if (bread >0) av_buffer[bread]='\0';
797 return fsec_errlog_defer(
798 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)));
800 for (j=0;j<bread;j++)
801 if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
803 /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
804 /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
807 /* pass the mailfile to fsecure */
808 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
810 /* debug_printf("send scan %s", file_name); */
811 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
812 return fsec_errlog_defer(errstr);
815 /* todo also SUSPICION\t */
816 fs_inf = m_pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr);
818 /* read report, linewise */
821 memset(av_buffer, 0, sizeof(av_buffer));
823 bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT);
827 return fsec_errlog_defer(
828 string_sprintf("unable to read result (%s)", strerror(err)));
832 while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n'));
833 av_buffer[i-1] = '\0';
834 /* debug_printf("got line \"%s\"\n",av_buffer); */
836 /* Really search for virus again? */
837 if (malware_name == NULL)
838 /* try matcher on the line, grab substring */
839 malware_name = m_pcre_exec(fs_inf, av_buffer);
841 while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
846 case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
848 struct sockaddr_un server;
852 uschar * scanrequest;
854 unsigned long kav_reportlen, bread;
858 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
859 return kavd_errlog_defer(errstr);
861 /* get current date and time, build scan request */
863 /* pdp note: before the eml_filename parameter, this scanned the
864 directory; not finding documentation, so we'll strip off the directory.
865 The side-effect is that the test framework scanning may end up in
866 scanning more than was requested, but for the normal interface, this is
868 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
869 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
870 p = Ustrrchr(scanrequest, '/');
874 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
875 scanner_name, scanner_options);
877 /* send scan request */
878 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
879 return kavd_errlog_defer(errstr);
881 /* wait for result */
882 if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) {
884 return kavd_errlog_defer("unable to read 2 bytes from socket.");
887 /* get errorcode from one nibble */
888 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
890 /* improper kavdaemon configuration */
891 if ( (kav_rc == 5) || (kav_rc == 6) ) {
893 return kavd_errlog_defer("please reconfigure kavdaemon to NOT disinfect or remove infected files.");
898 return kavd_errlog_defer("reported 'scanning not completed' (code 1).");
903 return kavd_errlog_defer("reported 'kavdaemon damaged' (code 7).");
906 /* code 8 is not handled, since it is ambigous. It appears mostly on
907 bounces where part of a file has been cut off */
909 /* "virus found" return codes (2-4) */
910 if ((kav_rc > 1) && (kav_rc < 5)) {
913 /* setup default virus name */
914 malware_name = "unknown";
916 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
918 /* read the report, if available */
919 if( report_flag == 1 ) {
920 /* read report size */
921 if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) {
923 return kavd_errlog_defer("cannot read report size");
926 /* it's possible that avp returns av_buffer[1] == 1 but the
927 reportsize is 0 (!?) */
928 if (kav_reportlen > 0) {
929 /* set up match regex, depends on retcode */
930 kav_re = m_pcre_compile( kav_rc == 3
931 ? "suspicion:\\s*(.+?)\\s*$"
932 : "infected:\\s*(.+?)\\s*$",
935 /* read report, linewise */
936 while (kav_reportlen > 0) {
938 while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
940 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
944 tmpbuf[bread] = '\0';
946 /* try matcher on the line, grab substring */
947 if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
953 else /* no virus found */
960 case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
962 const uschar *cmdline_scanner = scanner_options;
963 const pcre *cmdline_trigger_re;
964 const pcre *cmdline_regex_re;
966 uschar * commandline;
967 void (*eximsigchld)(int);
968 void (*eximsigpipe)(int);
969 FILE *scanner_out = NULL;
970 FILE *scanner_record = NULL;
971 uschar linebuffer[32767];
976 if (!cmdline_scanner)
977 return cmdl_errlog_defer("missing commandline specification");
979 /* find scanner output trigger */
980 cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
981 "missing trigger specification", &errstr);
982 if (!cmdline_trigger_re)
983 return cmdl_errlog_defer(errstr);
985 /* find scanner name regex */
986 cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
987 "missing virus name regex specification", &errstr);
988 if (!cmdline_regex_re)
989 return cmdl_errlog_defer(errstr);
991 /* prepare scanner call; despite the naming, file_name holds a directory
992 name which is documented as the value given to %s. */
994 file_name = string_copy(eml_filename);
995 p = Ustrrchr(file_name, '/');
998 commandline = string_sprintf(CS cmdline_scanner, file_name);
1000 /* redirect STDERR too */
1001 commandline = string_sprintf("%s 2>&1", commandline);
1003 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
1005 /* store exims signal handlers */
1006 eximsigchld = signal(SIGCHLD,SIG_DFL);
1007 eximsigpipe = signal(SIGPIPE,SIG_DFL);
1009 scanner_out = popen(CS commandline,"r");
1010 if (scanner_out == NULL) {
1012 signal(SIGCHLD,eximsigchld);
1013 signal(SIGPIPE,eximsigpipe);
1014 return cmdl_errlog_defer(
1015 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
1018 file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
1019 spool_directory, message_id, message_id);
1020 scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
1022 if (scanner_record == NULL) {
1024 pclose(scanner_out);
1025 signal(SIGCHLD,eximsigchld);
1026 signal(SIGPIPE,eximsigpipe);
1027 return cmdl_errlog_defer(
1028 string_sprintf("opening scanner output file (%s) failed: %s.",
1029 file_name, strerror(err)));
1032 /* look for trigger while recording output */
1033 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) {
1034 if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
1036 pclose(scanner_out);
1037 signal(SIGCHLD,eximsigchld);
1038 signal(SIGPIPE,eximsigpipe);
1039 return cmdl_errlog_defer(
1040 string_sprintf("short write on scanner output file (%s).", file_name));
1042 /* try trigger match */
1043 if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
1047 (void)fclose(scanner_record);
1048 pclose(scanner_out);
1049 signal(SIGCHLD,eximsigchld);
1050 signal(SIGPIPE,eximsigpipe);
1054 /* setup default virus name */
1055 malware_name = US"unknown";
1057 /* re-open the scanner output file, look for name match */
1058 scanner_record = fopen(CS file_name, "rb");
1059 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) {
1061 if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
1064 (void)fclose(scanner_record);
1066 else /* no virus found */
1067 malware_name = NULL;
1071 case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
1074 struct sockaddr_un server;
1078 uschar av_buffer[1024];
1080 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1081 return soph_errlog_defer(errstr);
1083 /* pass the scan directory to sophie */
1084 file_name = string_copy(eml_filename);
1085 if ((p = Ustrrchr(file_name, '/')))
1088 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
1089 scanner_name, scanner_options);
1091 if ( write(sock, file_name, Ustrlen(file_name)) < 0
1092 || write(sock, "\n", 1) != 1
1095 return soph_errlog_defer(
1096 string_sprintf("unable to write to UNIX socket (%s)", scanner_options));
1099 /* wait for result */
1100 memset(av_buffer, 0, sizeof(av_buffer));
1101 if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) {
1103 return soph_errlog_defer(
1104 string_sprintf("unable to read from UNIX socket (%s)", scanner_options));
1110 if (av_buffer[0] == '1') {
1111 uschar * s = Ustrchr(av_buffer, '\n');
1114 malware_name = string_copy(&av_buffer[2]);
1116 else if (!strncmp(CS av_buffer, "-1", 2))
1117 return soph_errlog_defer("scanner reported error");
1118 else /* all ok, no virus */
1119 malware_name = NULL;
1123 case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
1125 /* This code was originally contributed by David Saez */
1126 /* There are three scanning methods available to us:
1127 * (1) Use the SCAN command, pointing to a file in the filesystem
1128 * (2) Use the STREAM command, send the data on a separate port
1129 * (3) Use the zINSTREAM command, send the data inline
1130 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1131 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1132 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1133 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
1134 * WITH_OLD_CLAMAV_STREAM is defined.
1135 * See Exim bug 926 for details. */
1137 uschar *p, *vname, *result_tag, *response_end;
1138 struct sockaddr_un server;
1142 uschar av_buffer[1024];
1143 uschar *hostname = "";
1145 uschar *clamav_fbuf;
1146 int clam_fd, result;
1148 BOOL use_scan_command = FALSE;
1149 clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
1151 int num_servers = 0;
1152 #ifdef WITH_OLD_CLAMAV_STREAM
1153 uschar av_buffer2[1024];
1156 uint32_t send_size, send_final_zeroblock;
1159 if (*scanner_options == '/')
1160 /* Local file; so we def want to use_scan_command and don't want to try
1161 * passing IP/port combinations */
1162 use_scan_command = TRUE;
1164 const uschar *address = scanner_options;
1165 uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
1167 /* Go through the rest of the list of host/port and construct an array
1168 * of servers to try. The first one is the bit we just passed from
1169 * scanner_options so process that first and then scan the remainder of
1170 * the address buffer */
1172 clamd_address_container *this_clamd;
1174 /* The 'local' option means use the SCAN command over the network
1175 * socket (ie common file storage in use) */
1176 if (strcmpic(address,US"local") == 0) {
1177 use_scan_command = TRUE;
1181 /* XXX: If unsuccessful we should free this memory */
1183 (clamd_address_container *)store_get(sizeof(clamd_address_container));
1185 /* extract host and port part */
1186 if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
1187 this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
1188 clmd_errlog(string_sprintf("invalid address '%s'", address));
1192 clamd_address_vector[num_servers] = this_clamd;
1194 if (num_servers >= MAX_CLAMD_SERVERS) {
1195 clmd_errlog("More than " MAX_CLAMD_SERVERS_S " clamd servers "
1196 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1199 } while ((address = string_nextinlist(&av_scanner_work, &sep,
1201 sizeof(address_buffer))) != NULL);
1203 /* check if we have at least one server */
1205 return clmd_errlog_defer("no useable server addresses in malware configuration option.");
1208 /* See the discussion of response formats below to see why we really don't
1209 like colons in filenames when passing filenames to ClamAV. */
1210 if (use_scan_command && Ustrchr(eml_filename, ':'))
1211 return clmd_errlog_defer(
1212 string_sprintf("local/SCAN mode incompatible with" \
1213 " : in path to email filename [%s]", eml_filename));
1215 /* We have some network servers specified */
1218 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1219 * only supports AF_INET, but we should probably be looking to the
1220 * future and rewriting this to be protocol-independent anyway. */
1222 while ( num_servers > 0 ) {
1223 /* Randomly pick a server to start with */
1224 current_server = random_number( num_servers );
1226 debug_printf("trying server name %s, port %u\n",
1227 clamd_address_vector[current_server]->tcp_addr,
1228 clamd_address_vector[current_server]->tcp_port);
1230 /* Lookup the host. This is to ensure that we connect to the same IP
1231 * on both connections (as one host could resolve to multiple ips) */
1232 sock= m_tcpsocket(CS clamd_address_vector[current_server]->tcp_addr,
1233 clamd_address_vector[current_server]->tcp_port,
1234 &connhost, &errstr);
1236 /* Connection successfully established with a server */
1237 hostname = clamd_address_vector[current_server]->tcp_addr;
1241 clmd_errlog(errstr);
1243 /* Remove the server from the list. XXX We should free the memory */
1246 for( i = current_server; i < num_servers; i++ )
1247 clamd_address_vector[i] = clamd_address_vector[i+1];
1250 if ( num_servers == 0 )
1251 return clmd_errlog_defer("all servers failed");
1254 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1255 return clmd_errlog_defer(errstr);
1258 /* have socket in variable "sock"; command to use is semi-independent of
1259 * the socket protocol. We use SCAN if is local (either Unix/local
1260 * domain socket, or explicitly told local) else we stream the data.
1261 * How we stream the data depends upon how we were built. */
1263 if (!use_scan_command) {
1265 #ifdef WITH_OLD_CLAMAV_STREAM
1266 /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
1267 * that port on a second connection; then in the scan-method-neutral
1268 * part, read the response back on the original connection. */
1270 DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
1273 /* Pass the string to ClamAV (7 = "STREAM\n") */
1274 if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0)
1275 return clmd_errlog_defer(errstr);
1277 memset(av_buffer2, 0, sizeof(av_buffer2));
1278 bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1283 return clmd_errlog_defer(
1284 string_sprintf("unable to read PORT from socket (%s)",
1288 if (bread == sizeof(av_buffer2)) {
1290 return clmd_errlog_defer("buffer too small");
1293 if (!(*av_buffer2)) {
1295 return clmd_errlog_defer("ClamAV returned null");
1298 av_buffer2[bread] = '\0';
1299 if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) {
1301 return clmd_errlog_defer(
1302 string_sprintf("Expected port information from clamd, got '%s'",
1306 sockData = m_tcpsocket(connhost.address, port, NULL, &errstr);
1309 return clmd_errlog_defer(errstr);
1312 #define CLOSE_SOCKDATA (void)close(sockData)
1313 #else /* WITH_OLD_CLAMAV_STREAM not defined */
1314 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1315 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1318 DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1321 /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
1322 if (send(sock, "zINSTREAM", 10, 0) < 0) {
1325 return clmd_errlog_defer(
1326 string_sprintf("unable to send zINSTREAM to socket (%s)",
1330 #define CLOSE_SOCKDATA /**/
1333 /* calc file size */
1334 clam_fd = open(CS eml_filename, O_RDONLY);
1335 if (clam_fd == -1) {
1337 CLOSE_SOCKDATA; (void)close(sock);
1338 return clmd_errlog_defer(
1339 string_sprintf("can't open spool file %s: %s",
1340 eml_filename, strerror(err)));
1342 fsize = lseek(clam_fd, 0, SEEK_END);
1345 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1346 return clmd_errlog_defer(
1347 string_sprintf("can't seek spool file %s: %s",
1348 eml_filename, strerror(errno)));
1350 lseek(clam_fd, 0, SEEK_SET);
1352 clamav_fbuf = (uschar *) malloc (fsize);
1354 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1355 return clmd_errlog_defer(
1356 string_sprintf("unable to allocate memory %u for file (%s)",
1357 fsize, eml_filename));
1360 result = read (clam_fd, clamav_fbuf, fsize);
1363 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1365 return clmd_errlog_defer(
1366 string_sprintf("can't read spool file %s: %s",
1367 eml_filename, strerror(err)));
1369 (void)close(clam_fd);
1371 /* send file body to socket */
1372 #ifdef WITH_OLD_CLAMAV_STREAM
1373 if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1374 CLOSE_SOCKDATA; (void)close(sock);
1376 return clmd_errlog_defer(
1377 string_sprintf("unable to send file body to socket (%s:%u)",
1381 send_size = htonl(fsize);
1382 send_final_zeroblock = 0;
1383 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1384 (send(sock, clamav_fbuf, fsize, 0) < 0) ||
1385 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1389 return clmd_errlog_defer(
1390 string_sprintf("unable to send file body to socket (%s:%u)",
1398 #undef CLOSE_SOCKDATA
1400 } else { /* use scan command */
1401 /* Send a SCAN command pointing to a filename; then in the then in the
1402 * scan-method-neutral part, read the response back */
1404 /* ================================================================= */
1406 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1407 which dates to when ClamAV needed us to break apart the email into the
1408 MIME parts (eg, with the now deprecated demime condition coming first).
1409 Some time back, ClamAV gained the ability to deconstruct the emails, so
1410 doing this would actually have resulted in the mail attachments being
1411 scanned twice, in the broken out files and from the original .eml.
1412 Since ClamAV now handles emails (and has for quite some time) we can
1413 just use the email file itself. */
1414 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1415 file_name = string_sprintf("SCAN %s\n", eml_filename);
1417 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
1418 scanner_name, scanner_options);
1420 if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
1423 return clmd_errlog_defer(
1424 string_sprintf("unable to write to socket (%s)", strerror(err)));
1427 /* Do not shut down the socket for writing; a user report noted that
1428 * clamd 0.70 does not react well to this. */
1430 /* Commands have been sent, no matter which scan method or connection
1431 * type we're using; now just read the result, independent of method. */
1433 /* Read the result */
1434 memset(av_buffer, 0, sizeof(av_buffer));
1435 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1439 return clmd_errlog_defer(
1440 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1442 if (bread == sizeof(av_buffer))
1443 return clmd_errlog_defer("buffer too small");
1444 /* We're now assured of a NULL at the end of av_buffer */
1446 /* Check the result. ClamAV returns one of two result formats.
1447 In the basic mode, the response is of the form:
1448 infected: -> "<filename>: <virusname> FOUND"
1449 not-infected: -> "<filename>: OK"
1450 error: -> "<filename>: <errcode> ERROR
1451 If the ExtendedDetectionInfo option has been turned on, then we get:
1452 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1453 for the infected case. Compare:
1454 /tmp/eicar.com: Eicar-Test-Signature FOUND
1455 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1457 In the streaming case, clamd uses the filename "stream" which you should
1458 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1459 client app will replace "stream" with the original filename before returning
1460 results to stdout, but the trace shows the data).
1462 We will assume that the pathname passed to clamd from Exim does not contain
1463 a colon. We will have whined loudly above if the eml_filename does (and we're
1464 passing a filename to clamd). */
1467 return clmd_errlog_defer("ClamAV returned null");
1469 /* strip newline at the end (won't be present for zINSTREAM)
1470 (also any trailing whitespace, which shouldn't exist, but we depend upon
1471 this below, so double-check) */
1472 p = av_buffer + Ustrlen(av_buffer) - 1;
1473 if (*p == '\n') *p = '\0';
1475 DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
1477 while (isspace(*--p) && (p > av_buffer))
1482 /* colon in returned output? */
1483 if((p = Ustrchr(av_buffer,':')) == NULL)
1484 return clmd_errlog_defer(
1485 string_sprintf("ClamAV returned malformed result (missing colon): %s",
1488 /* strip filename */
1489 while (*p && isspace(*++p)) /**/;
1492 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1493 but we should at least be resistant to it. */
1494 p = Ustrrchr(vname, ' ');
1495 result_tag = p ? p+1 : vname;
1497 if (Ustrcmp(result_tag, "FOUND") == 0) {
1498 /* p should still be the whitespace before the result_tag */
1499 while (isspace(*p)) --p;
1501 /* Strip off the extended information too, which will be in parens
1502 after the virus name, with no intervening whitespace. */
1504 /* "(hash:size)", so previous '(' will do; if not found, we have
1505 a curious virus name, but not an error. */
1506 p = Ustrrchr(vname, '(');
1510 malware_name = string_copy(vname);
1511 DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
1513 } else if (Ustrcmp(result_tag, "ERROR") == 0)
1514 return clmd_errlog_defer(
1515 string_sprintf("ClamAV returned: %s", av_buffer));
1517 else if (Ustrcmp(result_tag, "OK") == 0) {
1518 /* Everything should be OK */
1519 malware_name = NULL;
1520 DEBUG(D_acl) debug_printf("Malware not found\n");
1523 return clmd_errlog_defer(
1524 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1529 case M_SOCK: /* "sock" scanner type ------------------------------------- */
1530 /* This code was derived by Martin Poole from the clamd code contributed
1531 by David Saez and the cmdline code
1535 uschar * commandline;
1536 uschar av_buffer[1024];
1537 uschar * linebuffer;
1538 uschar *sockline_scanner;
1539 uschar sockline_scanner_default[] = "%s\n";
1540 const pcre *sockline_trig_re;
1541 const pcre *sockline_name_re;
1543 /* find scanner command line */
1544 if (!(sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
1546 sockline_scanner = sockline_scanner_default;
1548 /* find scanner output trigger */
1549 sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1550 "missing trigger specification", &errstr);
1551 if (!sockline_trig_re)
1552 return sock_errlog_defer(errstr);
1554 /* find virus name regex */
1555 sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1556 "missing virus name regex specification", &errstr);
1557 if (!sockline_name_re)
1558 return sock_errlog_defer(errstr);
1560 /* prepare scanner call */
1561 commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
1562 commandline = string_sprintf( CS sockline_scanner, CS commandline);
1565 /* socket does not start with '/' -> network socket */
1566 sock = *scanner_options != '/'
1567 ? m_tcpsocket_fromdef(scanner_options, &errstr)
1568 : m_unixsocket(scanner_options, &errstr);
1570 return sock_errlog_defer(errstr);
1572 /* Pass the command string to the socket */
1573 if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
1574 return sock_errlog_defer(errstr);
1576 /* We're done sending, close socket for writing. */
1577 /* shutdown(sock, SHUT_WR); */
1579 /* Read the result */
1580 memset(av_buffer, 0, sizeof(av_buffer));
1581 bread = read(sock, av_buffer, sizeof(av_buffer));
1585 return sock_errlog_defer(
1586 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1588 if (bread == sizeof(av_buffer))
1589 return sock_errlog_defer("buffer too small");
1590 linebuffer = string_copy(av_buffer);
1592 /* try trigger match */
1593 if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) {
1594 if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
1595 malware_name = US "unknown";
1597 else /* no virus found */
1598 malware_name = NULL;
1601 case M_MKSD: /* "mksd" scanner type ------------------------------------- */
1603 char *mksd_options_end;
1604 int mksd_maxproc = 1; /* default, if no option supplied */
1608 if (scanner_options) {
1609 mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
1610 if ( *scanner_options == '\0'
1611 || *mksd_options_end != '\0'
1613 || mksd_maxproc > 32
1615 return mksd_errlog_defer(
1616 string_sprintf("invalid option '%s'", scanner_options));
1619 if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
1620 return mksd_errlog_defer(errstr);
1622 malware_name = NULL;
1624 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
1626 retval = mksd_scan_packed(sock, eml_filename);
1634 malware_ok = TRUE; /* set "been here, done that" marker */
1637 /* match virus name against pattern (caseless ------->----------v) */
1638 if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1639 DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
1647 /* simple wrapper for reading lines from sockets */
1649 recv_line(int sock, uschar *buffer, int size)
1653 memset(buffer,0,size);
1655 while(recv(sock,p,1,0) > -1) {
1656 if ((p-buffer) > (size-2)) break;
1657 if (*p == '\n') break;
1658 if (*p != '\r') p++;
1666 /* ============= private routines for the "mksd" scanner type ============== */
1668 #include <sys/uio.h>
1671 mksd_writev (int sock, struct iovec *iov, int iovcnt)
1677 i = writev (sock, iov, iovcnt);
1678 while ((i < 0) && (errno == EINTR));
1681 malware_errlog("unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1686 if (i >= iov->iov_len) {
1693 iov->iov_base = CS iov->iov_base + i;
1700 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1706 if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1708 malware_errlog("unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1713 /* offset == av_buffer_size -> buffer full */
1714 if (offset == av_buffer_size) {
1716 malware_errlog("malformed reply received from mksd");
1719 } while (av_buffer[offset-1] != '\n');
1721 av_buffer[offset] = '\0';
1726 mksd_parse_line (char *line)
1736 if ((p = strchr (line, '\n')) != NULL)
1738 return mksd_errlog_defer(string_sprintf("scanner failed: %s", line));
1741 if ((p = strchr (line, '\n')) != NULL) {
1743 if (((p-line) > 5) && (line[3] == ' '))
1744 if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1746 malware_name = string_copy(line+4);
1750 return mksd_errlog_defer(
1751 string_sprintf("malformed reply received from mksd: %s", line));
1756 mksd_scan_packed(int sock, uschar *scan_filename)
1758 struct iovec iov[3];
1759 const char *cmd = "MSQ\n";
1760 uschar av_buffer[1024];
1762 iov[0].iov_base = (void *) cmd;
1764 iov[1].iov_base = CS scan_filename;
1765 iov[1].iov_len = Ustrlen(scan_filename);
1766 iov[2].iov_base = (void *) (cmd + 3);
1769 if (mksd_writev (sock, iov, 3) < 0)
1772 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1777 return mksd_parse_line (CS av_buffer);
1780 #endif /*WITH_CONTENT_SCAN*/