1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-2014 */
8 /* Code for calling virus (malware) scanners. Called from acl.c. */
11 #ifdef WITH_CONTENT_SCAN
13 typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL,
14 M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD} scanner_t;
15 typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t;
20 const uschar * options_default;
24 { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP },
25 { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM },
26 { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX },
27 { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX },
28 { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX },
29 { M_CMDL, US"cmdline", NULL, MC_NONE },
30 { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX },
31 { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE },
32 { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM },
33 { M_MKSD, US"mksd", NULL, MC_NONE },
34 { -1, NULL, NULL, MC_NONE } /* end-marker */
37 /* The maximum number of clamd servers that are supported in the configuration */
38 #define MAX_CLAMD_SERVERS 32
39 #define MAX_CLAMD_SERVERS_S "32"
40 /* Maximum length of the hostname that can be specified in the clamd address list */
41 #define MAX_CLAMD_ADDRESS_LENGTH 64
42 #define MAX_CLAMD_ADDRESS_LENGTH_S "64"
44 typedef struct clamd_address_container {
45 uschar tcp_addr[MAX_CLAMD_ADDRESS_LENGTH];
46 unsigned int tcp_port;
47 } clamd_address_container;
49 /* declaration of private routines */
50 static int mksd_scan_packed(struct scan * scanent, int sock, uschar *scan_filename);
51 static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking);
54 # define nelements(arr) (sizeof(arr) / sizeof(arr[0]))
58 #define MALWARE_TIMEOUT 120
61 #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */
62 #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */
63 #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */
65 #define DERR_READ_ERR (1<<0) /* read error */
66 #define DERR_NOMEMORY (1<<2) /* no memory */
67 #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */
68 #define DERR_BAD_CALL (1<<15) /* wrong command */
70 /* Routine to check whether a system is big- or little-endian.
71 Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html
72 Needed for proper kavdaemon implementation. Sigh. */
73 #define BIG_MY_ENDIAN 0
74 #define LITTLE_MY_ENDIAN 1
75 static int test_byte_order(void);
79 short int word = 0x0001;
80 char *byte = (char *) &word;
81 return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN);
84 BOOL malware_ok = FALSE;
86 /* Gross hacks for the -bmalware option; perhaps we should just create
87 the scan directory normally for that case, but look into rigging up the
88 needed header variables if not already set on the command-line? */
89 extern int spool_mbox_ok;
90 extern uschar spooled_message_id[17];
92 /*************************************************
93 * Scan an email for malware *
94 *************************************************/
96 /* This is the normal interface for scanning an email, which doesn't need a
97 filename; it's a wrapper around the malware_file function.
100 listptr the list of options to the "malware = ..." ACL condition
102 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
103 where true means malware was found (condition applies)
106 malware(uschar **listptr)
108 uschar * scan_filename;
111 scan_filename = string_sprintf("%s/scan/%s/%s.eml",
112 spool_directory, message_id, message_id);
113 ret = malware_internal(listptr, scan_filename, FALSE);
114 if (ret == DEFER) av_failed = TRUE;
120 /*************************************************
121 * Scan a file for malware *
122 *************************************************/
124 /* This is a test wrapper for scanning an email, which is not used in
125 normal processing. Scan any file, using the Exim scanning interface.
126 This function tampers with various global variables so is unsafe to use
127 in any other context.
130 eml_filename a file holding the message to be scanned
132 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
133 where true means malware was found (condition applies)
136 malware_in_file(uschar *eml_filename)
138 uschar *scan_options[2];
139 uschar message_id_buf[64];
142 scan_options[0] = US"*";
143 scan_options[1] = NULL;
145 /* spool_mbox() assumes various parameters exist, when creating
146 the relevant directory and the email within */
147 (void) string_format(message_id_buf, sizeof(message_id_buf),
148 "dummy-%d", vaguely_random_number(INT_MAX));
149 message_id = message_id_buf;
150 sender_address = US"malware-sender@example.net";
152 recipients_list = NULL;
153 receive_add_recipient(US"malware-victim@example.net", -1);
154 enable_dollar_recipients = TRUE;
156 ret = malware_internal(scan_options, eml_filename, TRUE);
158 Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id));
160 /* don't set no_mbox_unspool; at present, there's no way for it to become
161 set, but if that changes, then it should apply to these tests too */
164 /* silence static analysis tools */
172 malware_errlog_defer(const uschar * str)
174 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
179 m_errlog_defer(struct scan * scanent, const uschar * str)
181 return malware_errlog_defer(string_sprintf("%s: %s", scanent->name, str));
184 m_errlog_defer_3(struct scan * scanent, const uschar * str,
187 (void) close(fd_to_close);
188 return m_errlog_defer(scanent, str);
191 /*************************************************/
193 /* Only used by the Clamav code, which is working from a list of servers and
194 uses the returned in_addr to get a second connection to the same system.
197 m_tcpsocket(const uschar * hostname, unsigned int port,
198 host_item * host, uschar ** errstr)
200 return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr);
204 m_tcpsocket_fromdef(const uschar * hostport, uschar ** errstr)
207 uschar hostname[256];
208 unsigned int portlow, porthigh;
210 /* extract host and port part */
211 scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh);
214 *errstr = string_sprintf("invalid socket '%s'", hostport);
220 return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh,
225 m_unixsocket(const uschar * path, uschar ** errstr)
228 struct sockaddr_un server;
230 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
231 *errstr = US"can't open UNIX socket.";
235 server.sun_family = AF_UNIX;
236 Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1);
237 server.sun_path[sizeof(server.sun_path)-1] = '\0';
238 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
241 *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
242 path, strerror(err));
249 m_streamsocket(const uschar * spec, uschar ** errstr)
252 ? m_unixsocket(spec, errstr) : m_tcpsocket_fromdef(spec, errstr);
256 m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
258 if (send(sock, buf, cnt, 0) < 0) {
261 *errstr = string_sprintf("unable to send to socket (%s): %s",
269 m_pcre_compile(const uschar * re, uschar ** errstr)
271 const uschar * rerror;
275 cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
277 *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
278 re, rerror, roffset);
283 m_pcre_exec(const pcre * cre, uschar * text)
286 int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
287 ovector, nelements(ovector));
288 uschar * substr = NULL;
289 if (i >= 2) /* Got it */
290 pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
295 m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr)
297 const uschar * list_ele;
298 const pcre * cre = NULL;
300 if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
301 *errstr = US listerr;
303 cre = m_pcre_compile(CUS list_ele, errstr);
307 /*************************************************
308 * Scan content for malware *
309 *************************************************/
311 /* This is an internal interface for scanning an email; the normal interface
312 is via malware(), or there's malware_in_file() used for testing/debugging.
315 listptr the list of options to the "malware = ..." ACL condition
316 eml_filename the file holding the email to be scanned
317 faking whether or not we're faking this up for the -bmalware test
319 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
320 where true means malware was found (condition applies)
323 malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
326 uschar *list = *listptr;
327 uschar *av_scanner_work = av_scanner;
328 uschar *scanner_name;
329 uschar *malware_regex;
330 uschar malware_regex_default[] = ".+";
331 unsigned long mbox_size;
335 struct scan * scanent;
336 const uschar * scanner_options;
339 /* make sure the eml mbox file is spooled up */
340 if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL)))
341 return malware_errlog_defer(US"error while creating mbox spool file");
343 /* none of our current scanners need the mbox
344 file as a stream, so we can close it right away */
345 (void)fclose(mbox_file);
347 /* extract the malware regex to match against from the option list */
348 if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0)))
349 return FAIL; /* empty means "don't match anything" */
351 /* parse 1st option */
352 if ( (strcmpic(malware_regex,US"false") == 0) ||
353 (Ustrcmp(malware_regex,"0") == 0) )
354 return FAIL; /* explicitly no matching */
356 /* special cases (match anything except empty) */
357 if ( (strcmpic(malware_regex,US"true") == 0) ||
358 (Ustrcmp(malware_regex,"*") == 0) ||
359 (Ustrcmp(malware_regex,"1") == 0) )
360 malware_regex = malware_regex_default;
362 /* Reset sep that is set by previous string_nextinlist() call */
365 /* compile the regex, see if it works */
366 if (!(re = m_pcre_compile(malware_regex, &errstr)))
367 return malware_errlog_defer(errstr);
369 /* if av_scanner starts with a dollar, expand it first */
370 if (*av_scanner == '$') {
371 if (!(av_scanner_work = expand_string(av_scanner)))
372 return malware_errlog_defer(
373 string_sprintf("av_scanner starts with $, but expansion failed: %s",
374 expand_string_message));
376 debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
377 /* disable result caching in this case */
382 /* Do not scan twice (unless av_scanner is dynamic). */
385 /* find the scanner type from the av_scanner option */
386 if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
387 return malware_errlog_defer(US"av_scanner configuration variable is empty");
389 for (scanent = m_scans; ; scanent++) {
391 return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
393 if (strcmpic(scanner_name, US scanent->name) != 0)
395 if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
396 scanner_options = scanent->options_default;
397 if (scanent->conn == MC_NONE)
399 switch(scanent->conn)
401 case MC_TCP: sock = m_tcpsocket_fromdef(scanner_options, &errstr); break;
402 case MC_UNIX: sock = m_unixsocket(scanner_options, &errstr); break;
403 case MC_STRM: sock = m_streamsocket(scanner_options, &errstr); break;
406 return m_errlog_defer(scanent, errstr);
409 DEBUG(D_lookup) debug_printf("Malware scan: %s\n", scanner_name);
411 switch (scanent->scancode) {
412 case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
414 uschar *fp_scan_option;
415 unsigned int detected=0, par_count=0;
416 uschar * scanrequest;
417 uschar buf[32768], *strhelper, *strhelper2;
418 uschar * malware_name_internal = NULL;
420 DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
421 scanrequest = string_sprintf("GET %s", eml_filename);
423 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
425 scanrequest = string_sprintf("%s%s%s", scanrequest,
426 par_count ? "%20" : "?", fp_scan_option);
429 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
431 /* send scan request */
432 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
433 return m_errlog_defer(scanent, errstr);
435 /* We get a lot of empty lines, so we need this hack to check for any data at all */
436 while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
437 if ( recv_line(sock, buf, sizeof(buf)) > 0) {
438 if ( Ustrstr(buf, US"<detected type=\"") != NULL )
440 else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
441 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
443 malware_name_internal = string_copy(strhelper+6);
445 } else if ( Ustrstr(buf, US"<summary code=\"") )
446 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
447 ? malware_name_internal : NULL;
453 case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
454 /* v0.1 - added support for tcp sockets */
455 /* v0.0 - initial release -- support for unix sockets */
459 uschar * tmpbuf, *drweb_fbuf;
460 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
461 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
463 const pcre *drweb_re;
465 /* prepare variables */
466 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
467 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
469 if (*scanner_options != '/') {
472 if ((drweb_fd = open(CS eml_filename, O_RDONLY)) == -1)
473 return m_errlog_defer_3(scanent,
474 string_sprintf("can't open spool file %s: %s",
475 eml_filename, strerror(errno)),
478 if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) {
480 (void)close(drweb_fd);
481 return m_errlog_defer_3(scanent,
482 string_sprintf("can't seek spool file %s: %s",
483 eml_filename, strerror(err)),
486 drweb_slen = htonl(fsize);
487 lseek(drweb_fd, 0, SEEK_SET);
489 DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n",
490 scanner_name, scanner_options);
492 /* send scan request */
493 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
494 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
495 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
496 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
497 (void)close(drweb_fd);
498 return m_errlog_defer_3(scanent,
499 string_sprintf("unable to send commands to socket (%s)", scanner_options),
503 if (!(drweb_fbuf = (uschar *) malloc (fsize))) {
504 (void)close(drweb_fd);
505 return m_errlog_defer_3(scanent,
506 string_sprintf("unable to allocate memory %u for file (%s)",
507 fsize, eml_filename),
511 if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) {
513 (void)close(drweb_fd);
515 return m_errlog_defer_3(scanent,
516 string_sprintf("can't read spool file %s: %s",
517 eml_filename, strerror(err)),
520 (void)close(drweb_fd);
522 /* send file body to socket */
523 if (send(sock, drweb_fbuf, fsize, 0) < 0) {
525 return m_errlog_defer_3(scanent,
526 string_sprintf("unable to send file body to socket (%s)", scanner_options),
529 (void)close(drweb_fd);
533 drweb_slen = htonl(Ustrlen(eml_filename));
535 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
536 scanner_name, scanner_options);
538 /* send scan request */
539 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
540 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
541 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
542 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
543 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0))
544 return m_errlog_defer_3(scanent,
545 string_sprintf("unable to send commands to socket (%s)", scanner_options),
549 /* wait for result */
550 if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc)))
551 return m_errlog_defer_3(scanent,
552 US"unable to read return code", sock);
553 drweb_rc = ntohl(drweb_rc);
555 if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum)))
556 return m_errlog_defer_3(scanent,
557 US"unable to read the number of viruses", sock);
558 drweb_vnum = ntohl(drweb_vnum);
560 /* "virus(es) found" if virus number is > 0 */
564 /* setup default virus name */
565 malware_name = US"unknown";
567 /* set up match regex */
568 drweb_re = m_pcre_compile(US"infected\\swith\\s*(.+?)$", &errstr);
570 /* read and concatenate virus names into one string */
571 for (i=0;i<drweb_vnum;i++)
573 int size = 0, off = 0, ovector[10*3];
574 /* read the size of report */
575 if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen)))
576 return m_errlog_defer_3(scanent,
577 US"cannot read report size", sock);
578 drweb_slen = ntohl(drweb_slen);
579 tmpbuf = store_get(drweb_slen);
581 /* read report body */
582 if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen)
583 return m_errlog_defer_3(scanent,
584 US"cannot read report string", sock);
585 tmpbuf[drweb_slen] = '\0';
587 /* try matcher on the line, grab substring */
588 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
589 ovector, nelements(ovector));
591 const char * pre_malware_nb;
593 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
595 if (i==0) /* the first name we just copy to malware_name */
596 malware_name = string_append(NULL, &size, &off,
599 else /* concatenate each new virus name to previous */
600 malware_name = string_append(malware_name, &size, &off,
601 2, "/", pre_malware_nb);
603 pcre_free_substring(pre_malware_nb);
608 const char *drweb_s = NULL;
610 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
611 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
612 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
613 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
614 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
615 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
616 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
617 * and others are ignored */
619 return m_errlog_defer_3(scanent,
620 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s),
629 case M_AVES: /* "aveserver" scanner type -------------------------------- */
634 /* read aveserver's greeting and see if it is ready (2xx greeting) */
635 recv_line(sock, buf, sizeof(buf));
637 if (buf[0] != '2') /* aveserver is having problems */
638 return m_errlog_defer_3(scanent,
639 string_sprintf("unavailable (Responded: %s).",
640 ((buf[0] != 0) ? buf : (uschar *)"nothing") ),
643 /* prepare our command */
644 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
647 DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
650 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
651 return m_errlog_defer(scanent, errstr);
655 /* read response lines, find malware name and final response */
656 while (recv_line(sock, buf, sizeof(buf)) > 0) {
657 debug_printf("aveserver: %s\n", buf);
660 if (buf[0] == '5') { /* aveserver is having problems */
661 result = m_errlog_defer(scanent,
662 string_sprintf("unable to scan file %s (Responded: %s).",
665 } else if (Ustrncmp(buf,"322",3) == 0) {
666 uschar *p = Ustrchr(&buf[4],' ');
668 malware_name = string_copy(&buf[4]);
673 if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0)
674 return m_errlog_defer(scanent, errstr);
676 /* read aveserver's greeting and see if it is ready (2xx greeting) */
677 recv_line(sock, buf, sizeof(buf));
679 if (buf[0] != '2') /* aveserver is having problems */
680 return m_errlog_defer_3(scanent,
681 string_sprintf("unable to quit dialogue (Responded: %s).",
682 ((buf[0] != 0) ? buf : (uschar *)"nothing") ),
685 if (result == DEFER) {
692 case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
696 uschar av_buffer[1024];
698 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
699 US"CONFIGURE\tTIMEOUT\t0\n",
700 US"CONFIGURE\tMAXARCH\t5\n",
701 US"CONFIGURE\tMIME\t1\n" };
705 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
706 scanner_name, scanner_options);
709 memset(av_buffer, 0, sizeof(av_buffer));
710 for (i=0; i != nelements(cmdopt); i++) {
712 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
713 return m_errlog_defer(scanent, errstr);
715 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
716 if (bread >0) av_buffer[bread]='\0';
718 return m_errlog_defer_3(scanent,
719 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)),
721 for (j=0;j<bread;j++)
722 if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
726 /* pass the mailfile to fsecure */
727 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
729 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
730 return m_errlog_defer(scanent, errstr);
733 /* todo also SUSPICION\t */
734 fs_inf = m_pcre_compile(US"\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr);
736 /* read report, linewise */
739 memset(av_buffer, 0, sizeof(av_buffer));
741 if ((bread= ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT)) < 0)
742 return m_errlog_defer_3(scanent,
743 string_sprintf("unable to read result (%s)", strerror(errno)),
745 } while (++i < sizeof(av_buffer)-1 && av_buffer[i-1] != '\n');
746 av_buffer[i-1] = '\0';
748 /* Really search for virus again? */
749 if (malware_name == NULL)
750 /* try matcher on the line, grab substring */
751 malware_name = m_pcre_exec(fs_inf, av_buffer);
753 while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
757 case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
761 uschar * scanrequest;
763 unsigned long kav_reportlen, bread;
767 /* get current date and time, build scan request */
769 /* pdp note: before the eml_filename parameter, this scanned the
770 directory; not finding documentation, so we'll strip off the directory.
771 The side-effect is that the test framework scanning may end up in
772 scanning more than was requested, but for the normal interface, this is
775 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
776 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
777 p = Ustrrchr(scanrequest, '/');
781 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
782 scanner_name, scanner_options);
784 /* send scan request */
785 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
786 return m_errlog_defer(scanent, errstr);
788 /* wait for result */
789 if ((bread = recv(sock, tmpbuf, 2, 0) != 2))
790 return m_errlog_defer_3(scanent,
791 US"unable to read 2 bytes from socket.", sock);
793 /* get errorcode from one nibble */
794 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
797 case 5: case 6: /* improper kavdaemon configuration */
798 return m_errlog_defer_3(scanent,
799 US"please reconfigure kavdaemon to NOT disinfect or remove infected files.",
802 return m_errlog_defer_3(scanent,
803 US"reported 'scanning not completed' (code 1).", sock);
805 return m_errlog_defer_3(scanent,
806 US"reported 'kavdaemon damaged' (code 7).", sock);
809 /* code 8 is not handled, since it is ambigous. It appears mostly on
810 bounces where part of a file has been cut off */
812 /* "virus found" return codes (2-4) */
813 if ((kav_rc > 1) && (kav_rc < 5)) {
816 /* setup default virus name */
817 malware_name = US"unknown";
819 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
821 /* read the report, if available */
822 if( report_flag == 1 ) {
823 /* read report size */
824 if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4)
825 return m_errlog_defer_3(scanent,
826 US"cannot read report size", sock);
828 /* it's possible that avp returns av_buffer[1] == 1 but the
829 reportsize is 0 (!?) */
830 if (kav_reportlen > 0) {
831 /* set up match regex, depends on retcode */
832 kav_re = m_pcre_compile( kav_rc == 3
833 ? US"suspicion:\\s*(.+?)\\s*$"
834 : US"infected:\\s*(.+?)\\s*$",
837 /* read report, linewise */
838 while (kav_reportlen > 0) {
840 while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
842 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
846 tmpbuf[bread] = '\0';
848 /* try matcher on the line, grab substring */
849 if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
855 else /* no virus found */
861 case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
863 const uschar *cmdline_scanner = scanner_options;
864 const pcre *cmdline_trigger_re;
865 const pcre *cmdline_regex_re;
867 uschar * commandline;
868 void (*eximsigchld)(int);
869 void (*eximsigpipe)(int);
870 FILE *scanner_out = NULL;
871 FILE *scanner_record = NULL;
872 uschar linebuffer[32767];
876 if (!cmdline_scanner)
877 return m_errlog_defer(scanent, errstr);
879 /* find scanner output trigger */
880 cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
881 "missing trigger specification", &errstr);
882 if (!cmdline_trigger_re)
883 return m_errlog_defer(scanent, errstr);
885 /* find scanner name regex */
886 cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
887 "missing virus name regex specification", &errstr);
888 if (!cmdline_regex_re)
889 return m_errlog_defer(scanent, errstr);
891 /* prepare scanner call; despite the naming, file_name holds a directory
892 name which is documented as the value given to %s. */
894 file_name = string_copy(eml_filename);
895 p = Ustrrchr(file_name, '/');
898 commandline = string_sprintf(CS cmdline_scanner, file_name);
900 /* redirect STDERR too */
901 commandline = string_sprintf("%s 2>&1", commandline);
903 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
905 /* store exims signal handlers */
906 eximsigchld = signal(SIGCHLD,SIG_DFL);
907 eximsigpipe = signal(SIGPIPE,SIG_DFL);
909 if (!(scanner_out = popen(CS commandline,"r"))) {
911 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
912 return m_errlog_defer(scanent,
913 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
916 file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
917 spool_directory, message_id, message_id);
918 scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
920 if (scanner_record == NULL) {
922 (void) pclose(scanner_out);
923 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
924 return m_errlog_defer(scanent,
925 string_sprintf("opening scanner output file (%s) failed: %s.",
926 file_name, strerror(err)));
929 /* look for trigger while recording output */
930 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) {
931 if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
933 (void) pclose(scanner_out);
934 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
935 return m_errlog_defer(scanent,
936 string_sprintf("short write on scanner output file (%s).", file_name));
938 /* try trigger match */
939 if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
943 (void)fclose(scanner_record);
944 sep = pclose(scanner_out);
945 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
948 return m_errlog_defer(scanent,
949 string_sprintf("running scanner failed: %s", strerror(sep)));
951 return m_errlog_defer(scanent,
952 string_sprintf("scanner returned error code: %d", sep));
956 /* setup default virus name */
957 malware_name = US"unknown";
959 /* re-open the scanner output file, look for name match */
960 scanner_record = fopen(CS file_name, "rb");
961 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) {
963 if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
966 (void)fclose(scanner_record);
968 else /* no virus found */
973 case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
978 uschar av_buffer[1024];
980 /* pass the scan directory to sophie */
981 file_name = string_copy(eml_filename);
982 if ((p = Ustrrchr(file_name, '/')))
985 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
986 scanner_name, scanner_options);
988 if ( write(sock, file_name, Ustrlen(file_name)) < 0
989 || write(sock, "\n", 1) != 1
991 return m_errlog_defer_3(scanent,
992 string_sprintf("unable to write to UNIX socket (%s)", scanner_options),
995 /* wait for result */
996 memset(av_buffer, 0, sizeof(av_buffer));
997 if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0))
998 return m_errlog_defer_3(scanent,
999 string_sprintf("unable to read from UNIX socket (%s)", scanner_options),
1003 if (av_buffer[0] == '1') {
1004 uschar * s = Ustrchr(av_buffer, '\n');
1007 malware_name = string_copy(&av_buffer[2]);
1009 else if (!strncmp(CS av_buffer, "-1", 2))
1010 return m_errlog_defer_3(scanent, US"scanner reported error", sock);
1011 else /* all ok, no virus */
1012 malware_name = NULL;
1017 case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
1019 /* This code was originally contributed by David Saez */
1020 /* There are three scanning methods available to us:
1021 * (1) Use the SCAN command, pointing to a file in the filesystem
1022 * (2) Use the STREAM command, send the data on a separate port
1023 * (3) Use the zINSTREAM command, send the data inline
1024 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1025 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1026 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1027 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
1028 * WITH_OLD_CLAMAV_STREAM is defined.
1029 * See Exim bug 926 for details. */
1031 uschar *p, *vname, *result_tag, *response_end;
1035 uschar av_buffer[1024];
1036 uschar *hostname = US"";
1038 uschar *clamav_fbuf;
1039 int clam_fd, result;
1041 BOOL use_scan_command = FALSE;
1042 clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
1044 int num_servers = 0;
1045 #ifdef WITH_OLD_CLAMAV_STREAM
1046 uschar av_buffer2[1024];
1049 uint32_t send_size, send_final_zeroblock;
1052 if (*scanner_options == '/')
1053 /* Local file; so we def want to use_scan_command and don't want to try
1054 * passing IP/port combinations */
1055 use_scan_command = TRUE;
1057 const uschar *address = scanner_options;
1058 uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
1060 /* Go through the rest of the list of host/port and construct an array
1061 * of servers to try. The first one is the bit we just passed from
1062 * scanner_options so process that first and then scan the remainder of
1063 * the address buffer */
1065 clamd_address_container *this_clamd;
1067 /* The 'local' option means use the SCAN command over the network
1068 * socket (ie common file storage in use) */
1069 if (strcmpic(address,US"local") == 0) {
1070 use_scan_command = TRUE;
1074 /* XXX: If unsuccessful we should free this memory */
1076 (clamd_address_container *)store_get(sizeof(clamd_address_container));
1078 /* extract host and port part */
1079 if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
1080 this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
1081 (void) m_errlog_defer(scanent,
1082 string_sprintf("invalid address '%s'", address));
1086 clamd_address_vector[num_servers] = this_clamd;
1088 if (num_servers >= MAX_CLAMD_SERVERS) {
1089 (void) m_errlog_defer(scanent,
1090 US"More than " MAX_CLAMD_SERVERS_S " clamd servers "
1091 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1094 } while ((address = string_nextinlist(&av_scanner_work, &sep,
1096 sizeof(address_buffer))) != NULL);
1098 /* check if we have at least one server */
1100 return m_errlog_defer(scanent,
1101 US"no useable server addresses in malware configuration option.");
1104 /* See the discussion of response formats below to see why we really don't
1105 like colons in filenames when passing filenames to ClamAV. */
1106 if (use_scan_command && Ustrchr(eml_filename, ':'))
1107 return m_errlog_defer(scanent,
1108 string_sprintf("local/SCAN mode incompatible with" \
1109 " : in path to email filename [%s]", eml_filename));
1111 /* We have some network servers specified */
1114 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1115 * only supports AF_INET, but we should probably be looking to the
1116 * future and rewriting this to be protocol-independent anyway. */
1118 while ( num_servers > 0 ) {
1119 /* Randomly pick a server to start with */
1120 current_server = random_number( num_servers );
1122 debug_printf("trying server name %s, port %u\n",
1123 clamd_address_vector[current_server]->tcp_addr,
1124 clamd_address_vector[current_server]->tcp_port);
1126 /* Lookup the host. This is to ensure that we connect to the same IP
1127 * on both connections (as one host could resolve to multiple ips) */
1128 sock= m_tcpsocket(clamd_address_vector[current_server]->tcp_addr,
1129 clamd_address_vector[current_server]->tcp_port,
1130 &connhost, &errstr);
1132 /* Connection successfully established with a server */
1133 hostname = clamd_address_vector[current_server]->tcp_addr;
1137 (void) m_errlog_defer(scanent, errstr);
1139 /* Remove the server from the list. XXX We should free the memory */
1142 for( i = current_server; i < num_servers; i++ )
1143 clamd_address_vector[i] = clamd_address_vector[i+1];
1146 if ( num_servers == 0 )
1147 return m_errlog_defer(scanent, US"all servers failed");
1150 if ((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1151 return m_errlog_defer(scanent, errstr);
1154 /* have socket in variable "sock"; command to use is semi-independent of
1155 * the socket protocol. We use SCAN if is local (either Unix/local
1156 * domain socket, or explicitly told local) else we stream the data.
1157 * How we stream the data depends upon how we were built. */
1159 if (!use_scan_command) {
1161 #ifdef WITH_OLD_CLAMAV_STREAM
1162 /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
1163 * that port on a second connection; then in the scan-method-neutral
1164 * part, read the response back on the original connection. */
1166 DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
1169 /* Pass the string to ClamAV (7 = "STREAM\n") */
1170 if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0)
1171 return m_errlog_defer(scanent, errstr);
1173 memset(av_buffer2, 0, sizeof(av_buffer2));
1174 bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1177 return m_errlog_defer_3(scanent,
1178 string_sprintf("unable to read PORT from socket (%s)",
1182 if (bread == sizeof(av_buffer2))
1183 return m_errlog_defer_3(scanent, "buffer too small", sock);
1186 return m_errlog_defer_3(scanent, "ClamAV returned null", sock);
1188 av_buffer2[bread] = '\0';
1189 if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 )
1190 return m_errlog_defer_3(scanent,
1191 string_sprintf("Expected port information from clamd, got '%s'",
1195 sockData = m_tcpsocket(connhost.address, port, NULL, &errstr);
1197 return m_errlog_defer_3(scanent, errstr, sock);
1199 #define CLOSE_SOCKDATA (void)close(sockData)
1200 #else /* WITH_OLD_CLAMAV_STREAM not defined */
1201 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1202 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1205 DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1208 /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
1209 if (send(sock, "zINSTREAM", 10, 0) < 0)
1210 return m_errlog_defer_3(scanent,
1211 string_sprintf("unable to send zINSTREAM to socket (%s)",
1215 #define CLOSE_SOCKDATA /**/
1218 /* calc file size */
1219 if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) {
1222 return m_errlog_defer_3(scanent,
1223 string_sprintf("can't open spool file %s: %s",
1224 eml_filename, strerror(err)),
1227 if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) {
1229 CLOSE_SOCKDATA; (void)close(clam_fd);
1230 return m_errlog_defer_3(scanent,
1231 string_sprintf("can't seek spool file %s: %s",
1232 eml_filename, strerror(err)),
1235 lseek(clam_fd, 0, SEEK_SET);
1237 if (!(clamav_fbuf = (uschar *) malloc (fsize))) {
1238 CLOSE_SOCKDATA; (void)close(clam_fd);
1239 return m_errlog_defer_3(scanent,
1240 string_sprintf("unable to allocate memory %u for file (%s)",
1241 fsize, eml_filename),
1245 if ((result = read(clam_fd, clamav_fbuf, fsize)) < 0) {
1247 free(clamav_fbuf); CLOSE_SOCKDATA; (void)close(clam_fd);
1248 return m_errlog_defer_3(scanent,
1249 string_sprintf("can't read spool file %s: %s",
1250 eml_filename, strerror(err)),
1253 (void)close(clam_fd);
1255 /* send file body to socket */
1256 #ifdef WITH_OLD_CLAMAV_STREAM
1257 if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1258 free(clamav_fbuf); CLOSE_SOCKDATA;
1259 return m_errlog_defer_3(scanent,
1260 string_sprintf("unable to send file body to socket (%s:%u)",
1265 send_size = htonl(fsize);
1266 send_final_zeroblock = 0;
1267 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1268 (send(sock, clamav_fbuf, fsize, 0) < 0) ||
1269 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1272 return m_errlog_defer_3(scanent,
1273 string_sprintf("unable to send file body to socket (%s:%u)",
1282 #undef CLOSE_SOCKDATA
1284 } else { /* use scan command */
1285 /* Send a SCAN command pointing to a filename; then in the then in the
1286 * scan-method-neutral part, read the response back */
1288 /* ================================================================= */
1290 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1291 which dates to when ClamAV needed us to break apart the email into the
1292 MIME parts (eg, with the now deprecated demime condition coming first).
1293 Some time back, ClamAV gained the ability to deconstruct the emails, so
1294 doing this would actually have resulted in the mail attachments being
1295 scanned twice, in the broken out files and from the original .eml.
1296 Since ClamAV now handles emails (and has for quite some time) we can
1297 just use the email file itself. */
1298 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1299 file_name = string_sprintf("SCAN %s\n", eml_filename);
1301 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
1302 scanner_name, scanner_options);
1304 if (send(sock, file_name, Ustrlen(file_name), 0) < 0)
1305 return m_errlog_defer_3(scanent,
1306 string_sprintf("unable to write to socket (%s)", strerror(errno)),
1309 /* Do not shut down the socket for writing; a user report noted that
1310 * clamd 0.70 does not react well to this. */
1312 /* Commands have been sent, no matter which scan method or connection
1313 * type we're using; now just read the result, independent of method. */
1315 /* Read the result */
1316 memset(av_buffer, 0, sizeof(av_buffer));
1317 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1322 return m_errlog_defer(scanent,
1323 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1325 if (bread == sizeof(av_buffer))
1326 return m_errlog_defer(scanent, US"buffer too small");
1327 /* We're now assured of a NULL at the end of av_buffer */
1329 /* Check the result. ClamAV returns one of two result formats.
1330 In the basic mode, the response is of the form:
1331 infected: -> "<filename>: <virusname> FOUND"
1332 not-infected: -> "<filename>: OK"
1333 error: -> "<filename>: <errcode> ERROR
1334 If the ExtendedDetectionInfo option has been turned on, then we get:
1335 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1336 for the infected case. Compare:
1337 /tmp/eicar.com: Eicar-Test-Signature FOUND
1338 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1340 In the streaming case, clamd uses the filename "stream" which you should
1341 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1342 client app will replace "stream" with the original filename before returning
1343 results to stdout, but the trace shows the data).
1345 We will assume that the pathname passed to clamd from Exim does not contain
1346 a colon. We will have whined loudly above if the eml_filename does (and we're
1347 passing a filename to clamd). */
1350 return m_errlog_defer(scanent, US"ClamAV returned null");
1352 /* strip newline at the end (won't be present for zINSTREAM)
1353 (also any trailing whitespace, which shouldn't exist, but we depend upon
1354 this below, so double-check) */
1355 p = av_buffer + Ustrlen(av_buffer) - 1;
1356 if (*p == '\n') *p = '\0';
1358 DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
1360 while (isspace(*--p) && (p > av_buffer))
1365 /* colon in returned output? */
1366 if((p = Ustrchr(av_buffer,':')) == NULL)
1367 return m_errlog_defer(scanent,
1368 string_sprintf("ClamAV returned malformed result (missing colon): %s",
1371 /* strip filename */
1372 while (*p && isspace(*++p)) /**/;
1375 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1376 but we should at least be resistant to it. */
1377 p = Ustrrchr(vname, ' ');
1378 result_tag = p ? p+1 : vname;
1380 if (Ustrcmp(result_tag, "FOUND") == 0) {
1381 /* p should still be the whitespace before the result_tag */
1382 while (isspace(*p)) --p;
1384 /* Strip off the extended information too, which will be in parens
1385 after the virus name, with no intervening whitespace. */
1387 /* "(hash:size)", so previous '(' will do; if not found, we have
1388 a curious virus name, but not an error. */
1389 p = Ustrrchr(vname, '(');
1393 malware_name = string_copy(vname);
1394 DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
1396 } else if (Ustrcmp(result_tag, "ERROR") == 0)
1397 return m_errlog_defer(scanent,
1398 string_sprintf("ClamAV returned: %s", av_buffer));
1400 else if (Ustrcmp(result_tag, "OK") == 0) {
1401 /* Everything should be OK */
1402 malware_name = NULL;
1403 DEBUG(D_acl) debug_printf("Malware not found\n");
1406 return m_errlog_defer(scanent,
1407 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1412 case M_SOCK: /* "sock" scanner type ------------------------------------- */
1413 /* This code was derived by Martin Poole from the clamd code contributed
1414 by David Saez and the cmdline code
1418 uschar * commandline;
1419 uschar av_buffer[1024];
1420 uschar * linebuffer;
1421 uschar * sockline_scanner;
1422 uschar sockline_scanner_default[] = "%s\n";
1423 const pcre *sockline_trig_re;
1424 const pcre *sockline_name_re;
1426 /* find scanner command line */
1427 if ((sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
1429 { /* check for no expansions apart from one %s */
1430 char * s = index(CS sockline_scanner, '%');
1432 if ((*s != 's' && *s != '%') || index(s+1, '%'))
1433 return m_errlog_defer_3(scanent,
1434 US"unsafe sock scanner call spec", sock);
1437 sockline_scanner = sockline_scanner_default;
1439 /* find scanner output trigger */
1440 sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1441 "missing trigger specification", &errstr);
1442 if (!sockline_trig_re)
1443 return m_errlog_defer_3(scanent, errstr, sock);
1445 /* find virus name regex */
1446 sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1447 "missing virus name regex specification", &errstr);
1448 if (!sockline_name_re)
1449 return m_errlog_defer_3(scanent, errstr, sock);
1451 /* prepare scanner call - security depends on expansions check above */
1452 commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
1453 commandline = string_sprintf( CS sockline_scanner, CS commandline);
1456 /* Pass the command string to the socket */
1457 if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
1458 return m_errlog_defer(scanent, errstr);
1460 /* Read the result */
1461 memset(av_buffer, 0, sizeof(av_buffer));
1462 bread = read(sock, av_buffer, sizeof(av_buffer));
1465 return m_errlog_defer_3(scanent,
1466 string_sprintf("unable to read from socket (%s)", strerror(errno)),
1469 if (bread == sizeof(av_buffer))
1470 return m_errlog_defer_3(scanent, US"buffer too small", sock);
1471 linebuffer = string_copy(av_buffer);
1473 /* try trigger match */
1474 if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) {
1475 if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
1476 malware_name = US "unknown";
1478 else /* no virus found */
1479 malware_name = NULL;
1483 case M_MKSD: /* "mksd" scanner type ------------------------------------- */
1485 char *mksd_options_end;
1486 int mksd_maxproc = 1; /* default, if no option supplied */
1490 if (scanner_options) {
1491 mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
1492 if ( *scanner_options == '\0'
1493 || *mksd_options_end != '\0'
1495 || mksd_maxproc > 32
1497 return m_errlog_defer(scanent,
1498 string_sprintf("invalid option '%s'", scanner_options));
1501 if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
1502 return m_errlog_defer(scanent, errstr);
1504 malware_name = NULL;
1506 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
1508 if ((retval = mksd_scan_packed(scanent, sock, eml_filename)) != OK) {
1517 (void) close (sock);
1518 malware_ok = TRUE; /* set "been here, done that" marker */
1521 /* match virus name against pattern (caseless ------->----------v) */
1522 if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1523 DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
1531 /* simple wrapper for reading lines from sockets */
1533 recv_line(int sock, uschar *buffer, int size)
1537 memset(buffer,0,size);
1539 while(recv(sock,p,1,0) > -1) {
1540 if ((p-buffer) > (size-2)) break;
1541 if (*p == '\n') break;
1542 if (*p != '\r') p++;
1550 /* ============= private routines for the "mksd" scanner type ============== */
1552 #include <sys/uio.h>
1555 mksd_writev (int sock, struct iovec *iov, int iovcnt)
1561 i = writev (sock, iov, iovcnt);
1562 while ((i < 0) && (errno == EINTR));
1564 (void) malware_errlog_defer(US"unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1569 if (i >= iov->iov_len) {
1576 iov->iov_base = CS iov->iov_base + i;
1583 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1589 if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1590 (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1595 /* offset == av_buffer_size -> buffer full */
1596 if (offset == av_buffer_size) {
1597 (void) malware_errlog_defer(US"malformed reply received from mksd");
1600 } while (av_buffer[offset-1] != '\n');
1602 av_buffer[offset] = '\0';
1607 mksd_parse_line(struct scan * scanent, char *line)
1617 if ((p = strchr (line, '\n')) != NULL)
1619 return m_errlog_defer(scanent,
1620 string_sprintf("scanner failed: %s", line));
1623 if ((p = strchr (line, '\n')) != NULL) {
1625 if (((p-line) > 5) && (line[3] == ' '))
1626 if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1628 malware_name = string_copy(US line+4);
1632 return m_errlog_defer(scanent,
1633 string_sprintf("malformed reply received: %s", line));
1638 mksd_scan_packed(struct scan * scanent, int sock, uschar *scan_filename)
1640 struct iovec iov[3];
1641 const char *cmd = "MSQ\n";
1642 uschar av_buffer[1024];
1644 iov[0].iov_base = (void *) cmd;
1646 iov[1].iov_base = CS scan_filename;
1647 iov[1].iov_len = Ustrlen(scan_filename);
1648 iov[2].iov_base = (void *) (cmd + 3);
1651 if (mksd_writev (sock, iov, 3) < 0)
1654 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1657 return mksd_parse_line (scanent, CS av_buffer);
1660 #endif /*WITH_CONTENT_SCAN*/