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 /*************************************************/
230 m_streamsocket(const uschar * hostname, struct in_addr * inp, uschar ** errstr)
235 /* Lookup the host */
236 if(!(he = gethostbyname(CS hostname))) {
237 *errstr = string_sprintf("failed to lookup host '%s'", hostname);
240 *inp = *(struct in_addr *) he->h_addr_list[0];
242 /* Create the TCP socket */
243 if ((sock = ip_socket(SOCK_STREAM, AF_INET)) >= 0)
246 *errstr = string_sprintf("unable to acquire socket (%s)", strerror(errno));
251 m_tcpsocket(const uschar * hostname, unsigned int port,
252 struct in_addr * inp, uschar ** errstr)
256 if ((sock = m_streamsocket(hostname, inp, errstr)) < 0)
259 if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(*inp), port, 5) >= 0)
262 *errstr = string_sprintf("connection to %s, port %u failed (%s)",
263 inet_ntoa(*inp), port, strerror(errno));
269 m_tcpsocket_fromdef(const uschar * hostport, uschar ** errstr)
272 uschar hostname[256];
273 unsigned int port, portlow, porthigh;
278 /* extract host and port part */
279 scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh);
282 *errstr = string_sprintf("invalid socket '%s'", hostport);
288 if ((sock = m_streamsocket(hostname, &in, errstr)) < 0)
291 /* Try to connect to all ports low-high until connection is established */
292 for (port = portlow; port <= porthigh; port++)
293 if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0)
296 *errstr = string_sprintf("connection to %s, port %u-%u failed (%s)",
297 inet_ntoa(in), portlow, porthigh, strerror(errno));
303 m_unixsocket(const uschar * path, uschar ** errstr)
306 struct sockaddr_un server;
308 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
309 *errstr = "can't open UNIX socket.";
313 server.sun_family = AF_UNIX;
314 Ustrcpy(server.sun_path, path);
315 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
318 *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
319 path, strerror(err));
326 m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
328 if (send(sock, buf, cnt, 0) < 0) {
331 *errstr = string_sprintf("unable to send to socket (%s): %s",
339 m_pcre_compile(const uschar * re, uschar ** errstr)
341 const uschar * rerror;
345 cre = pcre_compile(re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
347 *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
348 re, rerror, roffset);
353 m_pcre_exec(const pcre * cre, uschar * text)
356 int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
357 ovector, nelements(ovector));
358 uschar * substr = NULL;
359 if (i >= 2) /* Got it */
360 pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
365 m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr)
367 const uschar * list_ele;
368 const pcre * cre = NULL;
370 if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
371 *errstr = US listerr;
373 cre = m_pcre_compile(CS list_ele, errstr);
377 /*************************************************
378 * Scan content for malware *
379 *************************************************/
381 typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL,
382 M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD} scanner_t;
387 const char * options_default;
390 { M_FPROTD, "f-protd", "localhost 10200-10204" },
391 { M_DRWEB, "drweb", "/usr/local/drweb/run/drwebd.sock" },
392 { M_AVES, "aveserver", "/var/run/aveserver" },
393 { M_FSEC, "fsecure", "/var/run/.fsav" },
394 { M_KAVD, "kavdaemon", "/var/run/AvpCtl" },
395 { M_CMDL, "cmdline", NULL },
396 { M_SOPHIE, "sophie", "/var/run/sophie" },
397 { M_CLAMD, "clamd", "/tmp/clamd" },
398 { M_SOCK, "sock", "/tmp/malware.sock" },
399 { M_MKSD, "mksd", NULL },
400 { -1, NULL, NULL } /* end-marker */
403 /* This is an internal interface for scanning an email; the normal interface
404 is via malware(), or there's malware_in_file() used for testing/debugging.
407 listptr the list of options to the "malware = ..." ACL condition
408 eml_filename the file holding the email to be scanned
409 faking whether or not we're faking this up for the -bmalware test
411 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
412 where true means malware was found (condition applies)
415 malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
418 uschar *list = *listptr;
419 uschar *av_scanner_work = av_scanner;
420 uschar *scanner_name;
421 uschar *malware_regex;
422 uschar malware_regex_default[] = ".+";
423 unsigned long mbox_size;
427 struct scan * scanent;
428 const uschar * scanner_options;
430 /* make sure the eml mbox file is spooled up */
431 if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL)))
432 return malware_errlog_defer("error while creating mbox spool file");
434 /* none of our current scanners need the mbox
435 file as a stream, so we can close it right away */
436 /*XXX drweb and clamd do!! */
437 (void)fclose(mbox_file);
439 /* extract the malware regex to match against from the option list */
440 if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0))) {
442 /* parse 1st option */
443 if ( (strcmpic(malware_regex,US"false") == 0) ||
444 (Ustrcmp(malware_regex,"0") == 0) )
445 return FAIL; /* explicitly no matching */
447 /* special cases (match anything except empty) */
448 if ( (strcmpic(malware_regex,US"true") == 0) ||
449 (Ustrcmp(malware_regex,"*") == 0) ||
450 (Ustrcmp(malware_regex,"1") == 0) )
451 malware_regex = malware_regex_default;
453 else /* empty means "don't match anything" */
456 /* Reset sep that is set by previous string_nextinlist() call */
459 /* compile the regex, see if it works */
460 if (!(re = m_pcre_compile(CS malware_regex, &errstr)))
461 return malware_errlog_defer(errstr);
463 /* if av_scanner starts with a dollar, expand it first */
464 if (*av_scanner == '$') {
465 if (!(av_scanner_work = expand_string(av_scanner)))
466 return malware_errlog_defer(
467 string_sprintf("av_scanner starts with $, but expansion failed: %s",
468 expand_string_message));
470 debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
471 /* disable result caching in this case */
476 /* Do not scan twice. */
479 /* find the scanner type from the av_scanner option */
480 if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
481 return malware_errlog_defer("av_scanner configuration variable is empty");
483 for (scanent = m_scans; ; scanent++) {
485 return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
487 if (strcmpic(scanner_name, US scanent->name) == 0)
490 if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
491 scanner_options = scanent->options_default;
493 switch (scanent->scancode) {
494 case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
496 uschar *fp_scan_option;
497 unsigned int detected=0, par_count=0;
499 uschar * scanrequest;
500 uschar buf[32768], *strhelper, *strhelper2;
501 uschar * malware_name_internal = NULL;
503 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
504 return fprotd_errlog_defer(errstr);
506 DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
507 scanrequest = string_sprintf("GET %s", eml_filename);
509 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
511 scanrequest = string_sprintf("%s%s%s", scanrequest,
512 par_count ? "%20" : "?", fp_scan_option);
515 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
517 /* send scan request */
518 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
519 return fprotd_errlog_defer(errstr);
521 /* We get a lot of empty lines, so we need this hack to check for any data at all */
522 while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
523 if ( recv_line(sock, buf, sizeof(buf)) > 0) {
524 if ( Ustrstr(buf, US"<detected type=\"") != NULL )
526 else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
527 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
529 malware_name_internal = string_copy(strhelper+6);
531 } else if ( Ustrstr(buf, US"<summary code=\"") )
532 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
533 ? malware_name_internal : NULL;
540 case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
541 /* v0.1 - added support for tcp sockets */
542 /* v0.0 - initial release -- support for unix sockets */
544 struct sockaddr_un server;
547 uschar * tmpbuf, *drweb_fbuf;
548 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
549 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
551 const pcre *drweb_re;
553 if (*scanner_options != '/') {
554 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
555 return drweb_errlog_defer(errstr);
557 /* prepare variables */
558 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
559 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
562 drweb_fd = open(CS eml_filename, O_RDONLY);
563 if (drweb_fd == -1) {
566 return drweb_errlog_defer(
567 string_sprintf("can't open spool file %s: %s",
568 eml_filename, strerror(err)));
570 fsize = lseek(drweb_fd, 0, SEEK_END);
574 (void)close(drweb_fd);
575 return drweb_errlog_defer(
576 string_sprintf("can't seek spool file %s: %s",
577 eml_filename, strerror(err)));
579 drweb_slen = htonl(fsize);
580 lseek(drweb_fd, 0, SEEK_SET);
582 DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n",
583 scanner_name, scanner_options);
585 /* send scan request */
586 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
587 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
588 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
589 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
591 (void)close(drweb_fd);
592 return drweb_errlog_defer(
593 string_sprintf("unable to send commands to socket (%s)", scanner_options));
596 drweb_fbuf = (uschar *) malloc (fsize);
599 (void)close(drweb_fd);
600 return drweb_errlog_defer(
601 string_sprintf("unable to allocate memory %u for file (%s)",
602 fsize, eml_filename));
605 result = read (drweb_fd, drweb_fbuf, fsize);
609 (void)close(drweb_fd);
611 return drweb_errlog_defer(
612 string_sprintf("can't read spool file %s: %s",
613 eml_filename, strerror(err)));
615 (void)close(drweb_fd);
617 /* send file body to socket */
618 if (send(sock, drweb_fbuf, fsize, 0) < 0) {
621 return drweb_errlog_defer(
622 string_sprintf("unable to send file body to socket (%s)", scanner_options));
624 (void)close(drweb_fd);
628 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
629 return drweb_errlog_defer(errstr);
631 /* prepare variables */
632 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
633 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
634 drweb_slen = htonl(Ustrlen(eml_filename));
636 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
637 scanner_name, scanner_options);
639 /* send scan request */
640 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
641 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
642 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
643 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
644 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) {
646 return drweb_errlog_defer(
647 string_sprintf("unable to send commands to socket (%s)", scanner_options));
651 /* wait for result */
652 if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) {
654 return drweb_errlog_defer("unable to read return code");
656 drweb_rc = ntohl(drweb_rc);
658 if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) {
660 return drweb_errlog_defer("unable to read the number of viruses");
662 drweb_vnum = ntohl(drweb_vnum);
664 /* "virus(es) found" if virus number is > 0 */
668 /* setup default virus name */
669 malware_name = "unknown";
671 /* set up match regex */
672 drweb_re = m_pcre_compile( "infected\\swith\\s*(.+?)$", &errstr);
674 /* read and concatenate virus names into one string */
675 for (i=0;i<drweb_vnum;i++)
677 int size = 0, off = 0, ovector[10*3];
678 /* read the size of report */
679 if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) {
681 return drweb_errlog_defer("cannot read report size");
683 drweb_slen = ntohl(drweb_slen);
684 tmpbuf = store_get(drweb_slen);
686 /* read report body */
687 if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) {
689 return drweb_errlog_defer("cannot read report string");
691 tmpbuf[drweb_slen] = '\0';
693 /* try matcher on the line, grab substring */
694 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
695 ovector, nelements(ovector));
697 const char * pre_malware_nb;
699 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
701 if (i==0) /* the first name we just copy to malware_name */
702 malware_name = string_append(NULL, &size, &off,
705 else /* concatenate each new virus name to previous */
706 malware_name = string_append(malware_name, &size, &off,
707 2, "/", pre_malware_nb);
709 pcre_free_substring(pre_malware_nb);
714 const char *drweb_s = NULL;
716 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
717 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
718 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
719 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
720 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
721 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
722 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
723 * and others are ignored */
726 return drweb_errlog_defer(
727 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s));
736 case M_AVES: /* "aveserver" scanner type -------------------------------- */
739 struct sockaddr_un server;
743 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
744 return aves_errlog_defer(errstr);
746 /* read aveserver's greeting and see if it is ready (2xx greeting) */
747 recv_line(sock, buf, sizeof(buf));
750 /* aveserver is having problems */
752 return aves_errlog_defer(
753 string_sprintf("unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
756 /* prepare our command */
757 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
760 DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
763 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
764 return aves_errlog_defer(errstr);
768 /* read response lines, find malware name and final response */
769 while (recv_line(sock, buf, sizeof(buf)) > 0) {
770 debug_printf("aveserver: %s\n", buf);
773 if (buf[0] == '5') { /* aveserver is having problems */
774 result = aves_errlog_defer(
775 string_sprintf("unable to scan file %s (Responded: %s).",
778 } else if (Ustrncmp(buf,"322",3) == 0) {
779 uschar *p = Ustrchr(&buf[4],' ');
781 malware_name = string_copy(&buf[4]);
786 if (m_sock_send(sock, "quit\r\n", 6, &errstr) < 0)
787 return aves_errlog_defer(errstr);
789 /* read aveserver's greeting and see if it is ready (2xx greeting) */
790 recv_line(sock, buf, sizeof(buf));
793 /* aveserver is having problems */
795 return aves_errlog_defer(
796 string_sprintf("unable to quit dialogue (Responded: %s).",
797 ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
802 if (result == DEFER) return DEFER;
806 case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
808 struct sockaddr_un server;
809 int sock, i, j, bread = 0;
811 uschar av_buffer[1024];
813 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
814 US"CONFIGURE\tTIMEOUT\t0\n",
815 US"CONFIGURE\tMAXARCH\t5\n",
816 US"CONFIGURE\tMIME\t1\n" };
820 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
821 return fsec_errlog_defer(errstr);
823 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
824 scanner_name, scanner_options);
827 memset(av_buffer, 0, sizeof(av_buffer));
828 for (i=0; i != nelements(cmdopt); i++) {
829 /* debug_printf("send option \"%s\"",cmdopt[i]); */
831 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
832 return fsec_errlog_defer(errstr);
834 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
835 if (bread >0) av_buffer[bread]='\0';
839 return fsec_errlog_defer(
840 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)));
842 for (j=0;j<bread;j++)
843 if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
845 /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
846 /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
849 /* pass the mailfile to fsecure */
850 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
852 /* debug_printf("send scan %s", file_name); */
853 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
854 return fsec_errlog_defer(errstr);
857 /* todo also SUSPICION\t */
858 fs_inf = m_pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr);
860 /* read report, linewise */
863 memset(av_buffer, 0, sizeof(av_buffer));
865 bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT);
869 return fsec_errlog_defer(
870 string_sprintf("unable to read result (%s)", strerror(err)));
874 while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n'));
875 av_buffer[i-1] = '\0';
876 /* debug_printf("got line \"%s\"\n",av_buffer); */
878 /* Really search for virus again? */
879 if (malware_name == NULL)
880 /* try matcher on the line, grab substring */
881 malware_name = m_pcre_exec(fs_inf, av_buffer);
883 while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
888 case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
890 struct sockaddr_un server;
894 uschar * scanrequest;
896 unsigned long kav_reportlen, bread;
900 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
901 return kavd_errlog_defer(errstr);
903 /* get current date and time, build scan request */
905 /* pdp note: before the eml_filename parameter, this scanned the
906 directory; not finding documentation, so we'll strip off the directory.
907 The side-effect is that the test framework scanning may end up in
908 scanning more than was requested, but for the normal interface, this is
910 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
911 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
912 p = Ustrrchr(scanrequest, '/');
916 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
917 scanner_name, scanner_options);
919 /* send scan request */
920 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
921 return kavd_errlog_defer(errstr);
923 /* wait for result */
924 if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) {
926 return kavd_errlog_defer("unable to read 2 bytes from socket.");
929 /* get errorcode from one nibble */
930 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
932 /* improper kavdaemon configuration */
933 if ( (kav_rc == 5) || (kav_rc == 6) ) {
935 return kavd_errlog_defer("please reconfigure kavdaemon to NOT disinfect or remove infected files.");
940 return kavd_errlog_defer("reported 'scanning not completed' (code 1).");
945 return kavd_errlog_defer("reported 'kavdaemon damaged' (code 7).");
948 /* code 8 is not handled, since it is ambigous. It appears mostly on
949 bounces where part of a file has been cut off */
951 /* "virus found" return codes (2-4) */
952 if ((kav_rc > 1) && (kav_rc < 5)) {
955 /* setup default virus name */
956 malware_name = "unknown";
958 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
960 /* read the report, if available */
961 if( report_flag == 1 ) {
962 /* read report size */
963 if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) {
965 return kavd_errlog_defer("cannot read report size");
968 /* it's possible that avp returns av_buffer[1] == 1 but the
969 reportsize is 0 (!?) */
970 if (kav_reportlen > 0) {
971 /* set up match regex, depends on retcode */
972 kav_re = m_pcre_compile( kav_rc == 3
973 ? "suspicion:\\s*(.+?)\\s*$"
974 : "infected:\\s*(.+?)\\s*$",
977 /* read report, linewise */
978 while (kav_reportlen > 0) {
980 while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
982 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
986 tmpbuf[bread] = '\0';
988 /* try matcher on the line, grab substring */
989 if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
995 else /* no virus found */
1002 case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
1004 const uschar *cmdline_scanner = scanner_options;
1005 const pcre *cmdline_trigger_re;
1006 const pcre *cmdline_regex_re;
1008 uschar * commandline;
1009 void (*eximsigchld)(int);
1010 void (*eximsigpipe)(int);
1011 FILE *scanner_out = NULL;
1012 FILE *scanner_record = NULL;
1013 uschar linebuffer[32767];
1018 if (!cmdline_scanner)
1019 return cmdl_errlog_defer("missing commandline specification");
1021 /* find scanner output trigger */
1022 cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1023 "missing trigger specification", &errstr);
1024 if (!cmdline_trigger_re)
1025 return cmdl_errlog_defer(errstr);
1027 /* find scanner name regex */
1028 cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1029 "missing virus name regex specification", &errstr);
1030 if (!cmdline_regex_re)
1031 return cmdl_errlog_defer(errstr);
1033 /* prepare scanner call; despite the naming, file_name holds a directory
1034 name which is documented as the value given to %s. */
1036 file_name = string_copy(eml_filename);
1037 p = Ustrrchr(file_name, '/');
1040 commandline = string_sprintf(CS cmdline_scanner, file_name);
1042 /* redirect STDERR too */
1043 commandline = string_sprintf("%s 2>&1", commandline);
1045 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
1047 /* store exims signal handlers */
1048 eximsigchld = signal(SIGCHLD,SIG_DFL);
1049 eximsigpipe = signal(SIGPIPE,SIG_DFL);
1051 scanner_out = popen(CS commandline,"r");
1052 if (scanner_out == NULL) {
1054 signal(SIGCHLD,eximsigchld);
1055 signal(SIGPIPE,eximsigpipe);
1056 return cmdl_errlog_defer(
1057 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
1060 file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
1061 spool_directory, message_id, message_id);
1062 scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
1064 if (scanner_record == NULL) {
1066 pclose(scanner_out);
1067 signal(SIGCHLD,eximsigchld);
1068 signal(SIGPIPE,eximsigpipe);
1069 return cmdl_errlog_defer(
1070 string_sprintf("opening scanner output file (%s) failed: %s.",
1071 file_name, strerror(err)));
1074 /* look for trigger while recording output */
1075 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) {
1076 if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
1078 pclose(scanner_out);
1079 signal(SIGCHLD,eximsigchld);
1080 signal(SIGPIPE,eximsigpipe);
1081 return cmdl_errlog_defer(
1082 string_sprintf("short write on scanner output file (%s).", file_name));
1084 /* try trigger match */
1085 if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
1089 (void)fclose(scanner_record);
1090 pclose(scanner_out);
1091 signal(SIGCHLD,eximsigchld);
1092 signal(SIGPIPE,eximsigpipe);
1096 /* setup default virus name */
1097 malware_name = US"unknown";
1099 /* re-open the scanner output file, look for name match */
1100 scanner_record = fopen(CS file_name, "rb");
1101 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) {
1103 if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
1106 (void)fclose(scanner_record);
1108 else /* no virus found */
1109 malware_name = NULL;
1113 case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
1116 struct sockaddr_un server;
1120 uschar av_buffer[1024];
1122 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1123 return soph_errlog_defer(errstr);
1125 /* pass the scan directory to sophie */
1126 file_name = string_copy(eml_filename);
1127 if ((p = Ustrrchr(file_name, '/')))
1130 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
1131 scanner_name, scanner_options);
1133 if ( write(sock, file_name, Ustrlen(file_name)) < 0
1134 || write(sock, "\n", 1) != 1
1137 return soph_errlog_defer(
1138 string_sprintf("unable to write to UNIX socket (%s)", scanner_options));
1141 /* wait for result */
1142 memset(av_buffer, 0, sizeof(av_buffer));
1143 if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) {
1145 return soph_errlog_defer(
1146 string_sprintf("unable to read from UNIX socket (%s)", scanner_options));
1152 if (av_buffer[0] == '1') {
1153 uschar * s = Ustrchr(av_buffer, '\n');
1156 malware_name = string_copy(&av_buffer[2]);
1158 else if (!strncmp(CS av_buffer, "-1", 2))
1159 return soph_errlog_defer("scanner reported error");
1160 else /* all ok, no virus */
1161 malware_name = NULL;
1165 case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
1167 /* This code was originally contributed by David Saez */
1168 /* There are three scanning methods available to us:
1169 * (1) Use the SCAN command, pointing to a file in the filesystem
1170 * (2) Use the STREAM command, send the data on a separate port
1171 * (3) Use the zINSTREAM command, send the data inline
1172 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1173 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1174 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1175 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
1176 * WITH_OLD_CLAMAV_STREAM is defined.
1177 * See Exim bug 926 for details. */
1179 uschar *p, *vname, *result_tag, *response_end;
1180 struct sockaddr_un server;
1184 uschar av_buffer[1024];
1185 uschar *hostname = "";
1187 uschar *clamav_fbuf;
1188 int clam_fd, result;
1190 BOOL use_scan_command = FALSE;
1191 clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
1193 int num_servers = 0;
1194 #ifdef WITH_OLD_CLAMAV_STREAM
1195 uschar av_buffer2[1024];
1198 uint32_t send_size, send_final_zeroblock;
1201 if (*scanner_options == '/')
1202 /* Local file; so we def want to use_scan_command and don't want to try
1203 * passing IP/port combinations */
1204 use_scan_command = TRUE;
1206 const uschar *address = scanner_options;
1207 uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
1209 /* Go through the rest of the list of host/port and construct an array
1210 * of servers to try. The first one is the bit we just passed from
1211 * scanner_options so process that first and then scan the remainder of
1212 * the address buffer */
1214 clamd_address_container *this_clamd;
1216 /* The 'local' option means use the SCAN command over the network
1217 * socket (ie common file storage in use) */
1218 if (strcmpic(address,US"local") == 0) {
1219 use_scan_command = TRUE;
1223 /* XXX: If unsuccessful we should free this memory */
1225 (clamd_address_container *)store_get(sizeof(clamd_address_container));
1227 /* extract host and port part */
1228 if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
1229 this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
1230 clmd_errlog(string_sprintf("invalid address '%s'", address));
1234 clamd_address_vector[num_servers] = this_clamd;
1236 if (num_servers >= MAX_CLAMD_SERVERS) {
1237 clmd_errlog("More than " MAX_CLAMD_SERVERS_S " clamd servers "
1238 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1241 } while ((address = string_nextinlist(&av_scanner_work, &sep,
1243 sizeof(address_buffer))) != NULL);
1245 /* check if we have at least one server */
1247 return clmd_errlog_defer("no useable server addresses in malware configuration option.");
1250 /* See the discussion of response formats below to see why we really don't
1251 like colons in filenames when passing filenames to ClamAV. */
1252 if (use_scan_command && Ustrchr(eml_filename, ':'))
1253 return clmd_errlog_defer(
1254 string_sprintf("local/SCAN mode incompatible with" \
1255 " : in path to email filename [%s]", eml_filename));
1257 /* We have some network servers specified */
1260 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1261 * only supports AF_INET, but we should probably be looking to the
1262 * future and rewriting this to be protocol-independent anyway. */
1264 while ( num_servers > 0 ) {
1265 /* Randomly pick a server to start with */
1266 current_server = random_number( num_servers );
1268 debug_printf("trying server name %s, port %u\n",
1269 clamd_address_vector[current_server]->tcp_addr,
1270 clamd_address_vector[current_server]->tcp_port);
1272 /* Lookup the host. This is to ensure that we connect to the same IP
1273 * on both connections (as one host could resolve to multiple ips) */
1274 sock= m_tcpsocket(CS clamd_address_vector[current_server]->tcp_addr,
1275 clamd_address_vector[current_server]->tcp_port,
1278 /* Connection successfully established with a server */
1279 hostname = clamd_address_vector[current_server]->tcp_addr;
1283 clmd_errlog(errstr);
1285 /* Remove the server from the list. XXX We should free the memory */
1288 for( i = current_server; i < num_servers; i++ )
1289 clamd_address_vector[i] = clamd_address_vector[i+1];
1292 if ( num_servers == 0 )
1293 return clmd_errlog_defer("all servers failed");
1296 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1297 return clmd_errlog_defer(errstr);
1300 /* have socket in variable "sock"; command to use is semi-independent of
1301 * the socket protocol. We use SCAN if is local (either Unix/local
1302 * domain socket, or explicitly told local) else we stream the data.
1303 * How we stream the data depends upon how we were built. */
1305 if (!use_scan_command) {
1307 #ifdef WITH_OLD_CLAMAV_STREAM
1308 /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
1309 * that port on a second connection; then in the scan-method-neutral
1310 * part, read the response back on the original connection. */
1312 DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
1315 /* Pass the string to ClamAV (7 = "STREAM\n") */
1316 if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0)
1317 return clmd_errlog_defer(errstr);
1319 memset(av_buffer2, 0, sizeof(av_buffer2));
1320 bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1325 return clmd_errlog_defer(
1326 string_sprintf("unable to read PORT from socket (%s)",
1330 if (bread == sizeof(av_buffer2)) {
1332 return clmd_errlog_defer("buffer too small");
1335 if (!(*av_buffer2)) {
1337 return clmd_errlog_defer("ClamAV returned null");
1340 av_buffer2[bread] = '\0';
1341 if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) {
1343 return clmd_errlog_defer(
1344 string_sprintf("Expected port information from clamd, got '%s'",
1348 if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
1351 return clmd_errlog_defer(
1352 string_sprintf("unable to acquire socket (%s)", strerror(err)));
1355 if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
1357 (void)close(sockData); (void)close(sock);
1358 return clmd_errlog_defer(
1359 string_sprintf("connection to %s, port %u failed (%s)",
1360 inet_ntoa(in), port, strerror(err)));
1363 #define CLOSE_SOCKDATA (void)close(sockData)
1364 #else /* WITH_OLD_CLAMAV_STREAM not defined */
1365 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1366 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1369 DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1372 /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
1373 if (send(sock, "zINSTREAM", 10, 0) < 0) {
1376 return clmd_errlog_defer(
1377 string_sprintf("unable to send zINSTREAM to socket (%s)",
1381 #define CLOSE_SOCKDATA /**/
1384 /* calc file size */
1385 clam_fd = open(CS eml_filename, O_RDONLY);
1386 if (clam_fd == -1) {
1388 CLOSE_SOCKDATA; (void)close(sock);
1389 return clmd_errlog_defer(
1390 string_sprintf("can't open spool file %s: %s",
1391 eml_filename, strerror(err)));
1393 fsize = lseek(clam_fd, 0, SEEK_END);
1396 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1397 return clmd_errlog_defer(
1398 string_sprintf("can't seek spool file %s: %s",
1399 eml_filename, strerror(errno)));
1401 lseek(clam_fd, 0, SEEK_SET);
1403 clamav_fbuf = (uschar *) malloc (fsize);
1405 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1406 return clmd_errlog_defer(
1407 string_sprintf("unable to allocate memory %u for file (%s)",
1408 fsize, eml_filename));
1411 result = read (clam_fd, clamav_fbuf, fsize);
1414 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1416 return clmd_errlog_defer(
1417 string_sprintf("can't read spool file %s: %s",
1418 eml_filename, strerror(err)));
1420 (void)close(clam_fd);
1422 /* send file body to socket */
1423 #ifdef WITH_OLD_CLAMAV_STREAM
1424 if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1425 CLOSE_SOCKDATA; (void)close(sock);
1427 return clmd_errlog_defer(
1428 string_sprintf("unable to send file body to socket (%s:%u)",
1432 send_size = htonl(fsize);
1433 send_final_zeroblock = 0;
1434 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1435 (send(sock, clamav_fbuf, fsize, 0) < 0) ||
1436 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1440 return clmd_errlog_defer(
1441 string_sprintf("unable to send file body to socket (%s:%u)",
1449 #undef CLOSE_SOCKDATA
1451 } else { /* use scan command */
1452 /* Send a SCAN command pointing to a filename; then in the then in the
1453 * scan-method-neutral part, read the response back */
1455 /* ================================================================= */
1457 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1458 which dates to when ClamAV needed us to break apart the email into the
1459 MIME parts (eg, with the now deprecated demime condition coming first).
1460 Some time back, ClamAV gained the ability to deconstruct the emails, so
1461 doing this would actually have resulted in the mail attachments being
1462 scanned twice, in the broken out files and from the original .eml.
1463 Since ClamAV now handles emails (and has for quite some time) we can
1464 just use the email file itself. */
1465 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1466 file_name = string_sprintf("SCAN %s\n", eml_filename);
1468 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
1469 scanner_name, scanner_options);
1471 if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
1474 return clmd_errlog_defer(
1475 string_sprintf("unable to write to socket (%s)", strerror(err)));
1478 /* Do not shut down the socket for writing; a user report noted that
1479 * clamd 0.70 does not react well to this. */
1481 /* Commands have been sent, no matter which scan method or connection
1482 * type we're using; now just read the result, independent of method. */
1484 /* Read the result */
1485 memset(av_buffer, 0, sizeof(av_buffer));
1486 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1490 return clmd_errlog_defer(
1491 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1493 if (bread == sizeof(av_buffer))
1494 return clmd_errlog_defer("buffer too small");
1495 /* We're now assured of a NULL at the end of av_buffer */
1497 /* Check the result. ClamAV returns one of two result formats.
1498 In the basic mode, the response is of the form:
1499 infected: -> "<filename>: <virusname> FOUND"
1500 not-infected: -> "<filename>: OK"
1501 error: -> "<filename>: <errcode> ERROR
1502 If the ExtendedDetectionInfo option has been turned on, then we get:
1503 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1504 for the infected case. Compare:
1505 /tmp/eicar.com: Eicar-Test-Signature FOUND
1506 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1508 In the streaming case, clamd uses the filename "stream" which you should
1509 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1510 client app will replace "stream" with the original filename before returning
1511 results to stdout, but the trace shows the data).
1513 We will assume that the pathname passed to clamd from Exim does not contain
1514 a colon. We will have whined loudly above if the eml_filename does (and we're
1515 passing a filename to clamd). */
1518 return clmd_errlog_defer("ClamAV returned null");
1520 /* strip newline at the end (won't be present for zINSTREAM)
1521 (also any trailing whitespace, which shouldn't exist, but we depend upon
1522 this below, so double-check) */
1523 p = av_buffer + Ustrlen(av_buffer) - 1;
1524 if (*p == '\n') *p = '\0';
1526 DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
1528 while (isspace(*--p) && (p > av_buffer))
1533 /* colon in returned output? */
1534 if((p = Ustrchr(av_buffer,':')) == NULL)
1535 return clmd_errlog_defer(
1536 string_sprintf("ClamAV returned malformed result (missing colon): %s",
1539 /* strip filename */
1540 while (*p && isspace(*++p)) /**/;
1543 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1544 but we should at least be resistant to it. */
1545 p = Ustrrchr(vname, ' ');
1546 result_tag = p ? p+1 : vname;
1548 if (Ustrcmp(result_tag, "FOUND") == 0) {
1549 /* p should still be the whitespace before the result_tag */
1550 while (isspace(*p)) --p;
1552 /* Strip off the extended information too, which will be in parens
1553 after the virus name, with no intervening whitespace. */
1555 /* "(hash:size)", so previous '(' will do; if not found, we have
1556 a curious virus name, but not an error. */
1557 p = Ustrrchr(vname, '(');
1561 malware_name = string_copy(vname);
1562 DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
1564 } else if (Ustrcmp(result_tag, "ERROR") == 0)
1565 return clmd_errlog_defer(
1566 string_sprintf("ClamAV returned: %s", av_buffer));
1568 else if (Ustrcmp(result_tag, "OK") == 0) {
1569 /* Everything should be OK */
1570 malware_name = NULL;
1571 DEBUG(D_acl) debug_printf("Malware not found\n");
1574 return clmd_errlog_defer(
1575 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1580 case M_SOCK: /* "sock" scanner type ------------------------------------- */
1581 /* This code was derived by Martin Poole from the clamd code contributed
1582 by David Saez and the cmdline code
1586 uschar * commandline;
1587 uschar av_buffer[1024];
1588 uschar * linebuffer;
1589 uschar *sockline_scanner;
1590 uschar sockline_scanner_default[] = "%s\n";
1591 const pcre *sockline_trig_re;
1592 const pcre *sockline_name_re;
1594 /* find scanner command line */
1595 if (!(sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
1597 sockline_scanner = sockline_scanner_default;
1599 /* find scanner output trigger */
1600 sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1601 "missing trigger specification", &errstr);
1602 if (!sockline_trig_re)
1603 return sock_errlog_defer(errstr);
1605 /* find virus name regex */
1606 sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1607 "missing virus name regex specification", &errstr);
1608 if (!sockline_name_re)
1609 return sock_errlog_defer(errstr);
1611 /* prepare scanner call */
1612 commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
1613 commandline = string_sprintf( CS sockline_scanner, CS commandline);
1616 /* socket does not start with '/' -> network socket */
1617 sock = *scanner_options != '/'
1618 ? m_tcpsocket_fromdef(scanner_options, &errstr)
1619 : m_unixsocket(scanner_options, &errstr);
1621 return sock_errlog_defer(errstr);
1623 /* Pass the command string to the socket */
1624 if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
1625 return sock_errlog_defer(errstr);
1627 /* We're done sending, close socket for writing. */
1628 /* shutdown(sock, SHUT_WR); */
1630 /* Read the result */
1631 memset(av_buffer, 0, sizeof(av_buffer));
1632 bread = read(sock, av_buffer, sizeof(av_buffer));
1636 return sock_errlog_defer(
1637 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1639 if (bread == sizeof(av_buffer))
1640 return sock_errlog_defer("buffer too small");
1641 linebuffer = string_copy(av_buffer);
1643 /* try trigger match */
1644 if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) {
1645 if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
1646 malware_name = US "unknown";
1648 else /* no virus found */
1649 malware_name = NULL;
1652 case M_MKSD: /* "mksd" scanner type ------------------------------------- */
1654 char *mksd_options_end;
1655 int mksd_maxproc = 1; /* default, if no option supplied */
1659 if (scanner_options) {
1660 mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
1661 if ( *scanner_options == '\0'
1662 || *mksd_options_end != '\0'
1664 || mksd_maxproc > 32
1666 return mksd_errlog_defer(
1667 string_sprintf("invalid option '%s'", scanner_options));
1670 if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
1671 return mksd_errlog_defer(errstr);
1673 malware_name = NULL;
1675 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
1677 retval = mksd_scan_packed(sock, eml_filename);
1685 malware_ok = TRUE; /* set "been here, done that" marker */
1688 /* match virus name against pattern (caseless ------->----------v) */
1689 if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1690 DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
1698 /* simple wrapper for reading lines from sockets */
1700 recv_line(int sock, uschar *buffer, int size)
1704 memset(buffer,0,size);
1706 while(recv(sock,p,1,0) > -1) {
1707 if ((p-buffer) > (size-2)) break;
1708 if (*p == '\n') break;
1709 if (*p != '\r') p++;
1717 /* ============= private routines for the "mksd" scanner type ============== */
1719 #include <sys/uio.h>
1722 mksd_writev (int sock, struct iovec *iov, int iovcnt)
1728 i = writev (sock, iov, iovcnt);
1729 while ((i < 0) && (errno == EINTR));
1732 malware_errlog("unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1737 if (i >= iov->iov_len) {
1744 iov->iov_base = CS iov->iov_base + i;
1751 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1757 if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1759 malware_errlog("unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1764 /* offset == av_buffer_size -> buffer full */
1765 if (offset == av_buffer_size) {
1767 malware_errlog("malformed reply received from mksd");
1770 } while (av_buffer[offset-1] != '\n');
1772 av_buffer[offset] = '\0';
1777 mksd_parse_line (char *line)
1787 if ((p = strchr (line, '\n')) != NULL)
1789 return mksd_errlog_defer(string_sprintf("scanner failed: %s", line));
1792 if ((p = strchr (line, '\n')) != NULL) {
1794 if (((p-line) > 5) && (line[3] == ' '))
1795 if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1797 malware_name = string_copy(line+4);
1801 return mksd_errlog_defer(
1802 string_sprintf("malformed reply received from mksd: %s", line));
1807 mksd_scan_packed(int sock, uschar *scan_filename)
1809 struct iovec iov[3];
1810 const char *cmd = "MSQ\n";
1811 uschar av_buffer[1024];
1813 iov[0].iov_base = (void *) cmd;
1815 iov[1].iov_base = CS scan_filename;
1816 iov[1].iov_len = Ustrlen(scan_filename);
1817 iov[2].iov_base = (void *) (cmd + 3);
1820 if (mksd_writev (sock, iov, 3) < 0)
1823 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1828 return mksd_parse_line (CS av_buffer);
1831 #endif /*WITH_CONTENT_SCAN*/