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 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);
410 switch (scanent->scancode) {
411 case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
413 uschar *fp_scan_option;
414 unsigned int detected=0, par_count=0;
415 uschar * scanrequest;
416 uschar buf[32768], *strhelper, *strhelper2;
417 uschar * malware_name_internal = NULL;
419 DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
420 scanrequest = string_sprintf("GET %s", eml_filename);
422 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
424 scanrequest = string_sprintf("%s%s%s", scanrequest,
425 par_count ? "%20" : "?", fp_scan_option);
428 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
430 /* send scan request */
431 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
432 return m_errlog_defer(scanent, errstr);
434 /* We get a lot of empty lines, so we need this hack to check for any data at all */
435 while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
436 if ( recv_line(sock, buf, sizeof(buf)) > 0) {
437 if ( Ustrstr(buf, US"<detected type=\"") != NULL )
439 else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
440 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
442 malware_name_internal = string_copy(strhelper+6);
444 } else if ( Ustrstr(buf, US"<summary code=\"") )
445 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
446 ? malware_name_internal : NULL;
452 case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
453 /* v0.1 - added support for tcp sockets */
454 /* v0.0 - initial release -- support for unix sockets */
458 uschar * tmpbuf, *drweb_fbuf;
459 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
460 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
462 const pcre *drweb_re;
464 /* prepare variables */
465 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
466 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
468 if (*scanner_options != '/') {
471 if ((drweb_fd = open(CS eml_filename, O_RDONLY)) == -1)
472 return m_errlog_defer_3(scanent,
473 string_sprintf("can't open spool file %s: %s",
474 eml_filename, strerror(errno)),
477 if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) {
479 (void)close(drweb_fd);
480 return m_errlog_defer_3(scanent,
481 string_sprintf("can't seek spool file %s: %s",
482 eml_filename, strerror(err)),
485 drweb_slen = htonl(fsize);
486 lseek(drweb_fd, 0, SEEK_SET);
488 DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n",
489 scanner_name, scanner_options);
491 /* send scan request */
492 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
493 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
494 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
495 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
496 (void)close(drweb_fd);
497 return m_errlog_defer_3(scanent,
498 string_sprintf("unable to send commands to socket (%s)", scanner_options),
502 if (!(drweb_fbuf = (uschar *) malloc (fsize))) {
503 (void)close(drweb_fd);
504 return m_errlog_defer_3(scanent,
505 string_sprintf("unable to allocate memory %u for file (%s)",
506 fsize, eml_filename),
510 if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) {
512 (void)close(drweb_fd);
514 return m_errlog_defer_3(scanent,
515 string_sprintf("can't read spool file %s: %s",
516 eml_filename, strerror(err)),
519 (void)close(drweb_fd);
521 /* send file body to socket */
522 if (send(sock, drweb_fbuf, fsize, 0) < 0) {
524 return m_errlog_defer_3(scanent,
525 string_sprintf("unable to send file body to socket (%s)", scanner_options),
528 (void)close(drweb_fd);
532 drweb_slen = htonl(Ustrlen(eml_filename));
534 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
535 scanner_name, scanner_options);
537 /* send scan request */
538 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
539 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
540 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
541 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
542 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0))
543 return m_errlog_defer_3(scanent,
544 string_sprintf("unable to send commands to socket (%s)", scanner_options),
548 /* wait for result */
549 if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc)))
550 return m_errlog_defer_3(scanent,
551 US"unable to read return code", sock);
552 drweb_rc = ntohl(drweb_rc);
554 if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum)))
555 return m_errlog_defer_3(scanent,
556 US"unable to read the number of viruses", sock);
557 drweb_vnum = ntohl(drweb_vnum);
559 /* "virus(es) found" if virus number is > 0 */
563 /* setup default virus name */
564 malware_name = US"unknown";
566 /* set up match regex */
567 drweb_re = m_pcre_compile(US"infected\\swith\\s*(.+?)$", &errstr);
569 /* read and concatenate virus names into one string */
570 for (i=0;i<drweb_vnum;i++)
572 int size = 0, off = 0, ovector[10*3];
573 /* read the size of report */
574 if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen)))
575 return m_errlog_defer_3(scanent,
576 US"cannot read report size", sock);
577 drweb_slen = ntohl(drweb_slen);
578 tmpbuf = store_get(drweb_slen);
580 /* read report body */
581 if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen)
582 return m_errlog_defer_3(scanent,
583 US"cannot read report string", sock);
584 tmpbuf[drweb_slen] = '\0';
586 /* try matcher on the line, grab substring */
587 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
588 ovector, nelements(ovector));
590 const char * pre_malware_nb;
592 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
594 if (i==0) /* the first name we just copy to malware_name */
595 malware_name = string_append(NULL, &size, &off,
598 else /* concatenate each new virus name to previous */
599 malware_name = string_append(malware_name, &size, &off,
600 2, "/", pre_malware_nb);
602 pcre_free_substring(pre_malware_nb);
607 const char *drweb_s = NULL;
609 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
610 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
611 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
612 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
613 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
614 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
615 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
616 * and others are ignored */
618 return m_errlog_defer_3(scanent,
619 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s),
628 case M_AVES: /* "aveserver" scanner type -------------------------------- */
633 /* read aveserver's greeting and see if it is ready (2xx greeting) */
634 recv_line(sock, buf, sizeof(buf));
636 if (buf[0] != '2') /* aveserver is having problems */
637 return m_errlog_defer_3(scanent,
638 string_sprintf("unavailable (Responded: %s).",
639 ((buf[0] != 0) ? buf : (uschar *)"nothing") ),
642 /* prepare our command */
643 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
646 DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
649 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
650 return m_errlog_defer(scanent, errstr);
654 /* read response lines, find malware name and final response */
655 while (recv_line(sock, buf, sizeof(buf)) > 0) {
656 debug_printf("aveserver: %s\n", buf);
659 if (buf[0] == '5') { /* aveserver is having problems */
660 result = m_errlog_defer(scanent,
661 string_sprintf("unable to scan file %s (Responded: %s).",
664 } else if (Ustrncmp(buf,"322",3) == 0) {
665 uschar *p = Ustrchr(&buf[4],' ');
667 malware_name = string_copy(&buf[4]);
672 if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0)
673 return m_errlog_defer(scanent, errstr);
675 /* read aveserver's greeting and see if it is ready (2xx greeting) */
676 recv_line(sock, buf, sizeof(buf));
678 if (buf[0] != '2') /* aveserver is having problems */
679 return m_errlog_defer_3(scanent,
680 string_sprintf("unable to quit dialogue (Responded: %s).",
681 ((buf[0] != 0) ? buf : (uschar *)"nothing") ),
684 if (result == DEFER) {
691 case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
695 uschar av_buffer[1024];
697 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
698 US"CONFIGURE\tTIMEOUT\t0\n",
699 US"CONFIGURE\tMAXARCH\t5\n",
700 US"CONFIGURE\tMIME\t1\n" };
704 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
705 scanner_name, scanner_options);
708 memset(av_buffer, 0, sizeof(av_buffer));
709 for (i=0; i != nelements(cmdopt); i++) {
711 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
712 return m_errlog_defer(scanent, errstr);
714 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
715 if (bread >0) av_buffer[bread]='\0';
717 return m_errlog_defer_3(scanent,
718 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)),
720 for (j=0;j<bread;j++)
721 if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
725 /* pass the mailfile to fsecure */
726 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
728 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
729 return m_errlog_defer(scanent, errstr);
732 /* todo also SUSPICION\t */
733 fs_inf = m_pcre_compile(US"\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr);
735 /* read report, linewise */
738 memset(av_buffer, 0, sizeof(av_buffer));
740 if ((bread= ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT)) < 0)
741 return m_errlog_defer_3(scanent,
742 string_sprintf("unable to read result (%s)", strerror(errno)),
744 } while (++i < sizeof(av_buffer)-1 && av_buffer[i-1] != '\n');
745 av_buffer[i-1] = '\0';
747 /* Really search for virus again? */
748 if (malware_name == NULL)
749 /* try matcher on the line, grab substring */
750 malware_name = m_pcre_exec(fs_inf, av_buffer);
752 while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
756 case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
760 uschar * scanrequest;
762 unsigned long kav_reportlen, bread;
766 /* get current date and time, build scan request */
768 /* pdp note: before the eml_filename parameter, this scanned the
769 directory; not finding documentation, so we'll strip off the directory.
770 The side-effect is that the test framework scanning may end up in
771 scanning more than was requested, but for the normal interface, this is
774 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
775 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
776 p = Ustrrchr(scanrequest, '/');
780 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
781 scanner_name, scanner_options);
783 /* send scan request */
784 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
785 return m_errlog_defer(scanent, errstr);
787 /* wait for result */
788 if ((bread = recv(sock, tmpbuf, 2, 0) != 2))
789 return m_errlog_defer_3(scanent,
790 US"unable to read 2 bytes from socket.", sock);
792 /* get errorcode from one nibble */
793 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
796 case 5: case 6: /* improper kavdaemon configuration */
797 return m_errlog_defer_3(scanent,
798 US"please reconfigure kavdaemon to NOT disinfect or remove infected files.",
801 return m_errlog_defer_3(scanent,
802 US"reported 'scanning not completed' (code 1).", sock);
804 return m_errlog_defer_3(scanent,
805 US"reported 'kavdaemon damaged' (code 7).", sock);
808 /* code 8 is not handled, since it is ambigous. It appears mostly on
809 bounces where part of a file has been cut off */
811 /* "virus found" return codes (2-4) */
812 if ((kav_rc > 1) && (kav_rc < 5)) {
815 /* setup default virus name */
816 malware_name = US"unknown";
818 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
820 /* read the report, if available */
821 if( report_flag == 1 ) {
822 /* read report size */
823 if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4)
824 return m_errlog_defer_3(scanent,
825 US"cannot read report size", sock);
827 /* it's possible that avp returns av_buffer[1] == 1 but the
828 reportsize is 0 (!?) */
829 if (kav_reportlen > 0) {
830 /* set up match regex, depends on retcode */
831 kav_re = m_pcre_compile( kav_rc == 3
832 ? US"suspicion:\\s*(.+?)\\s*$"
833 : US"infected:\\s*(.+?)\\s*$",
836 /* read report, linewise */
837 while (kav_reportlen > 0) {
839 while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
841 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
845 tmpbuf[bread] = '\0';
847 /* try matcher on the line, grab substring */
848 if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
854 else /* no virus found */
860 case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
862 const uschar *cmdline_scanner = scanner_options;
863 const pcre *cmdline_trigger_re;
864 const pcre *cmdline_regex_re;
866 uschar * commandline;
867 void (*eximsigchld)(int);
868 void (*eximsigpipe)(int);
869 FILE *scanner_out = NULL;
870 FILE *scanner_record = NULL;
871 uschar linebuffer[32767];
875 if (!cmdline_scanner)
876 return m_errlog_defer(scanent, errstr);
878 /* find scanner output trigger */
879 cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
880 "missing trigger specification", &errstr);
881 if (!cmdline_trigger_re)
882 return m_errlog_defer(scanent, errstr);
884 /* find scanner name regex */
885 cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
886 "missing virus name regex specification", &errstr);
887 if (!cmdline_regex_re)
888 return m_errlog_defer(scanent, errstr);
890 /* prepare scanner call; despite the naming, file_name holds a directory
891 name which is documented as the value given to %s. */
893 file_name = string_copy(eml_filename);
894 p = Ustrrchr(file_name, '/');
897 commandline = string_sprintf(CS cmdline_scanner, file_name);
899 /* redirect STDERR too */
900 commandline = string_sprintf("%s 2>&1", commandline);
902 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
904 /* store exims signal handlers */
905 eximsigchld = signal(SIGCHLD,SIG_DFL);
906 eximsigpipe = signal(SIGPIPE,SIG_DFL);
908 if (!(scanner_out = popen(CS commandline,"r"))) {
910 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
911 return m_errlog_defer(scanent,
912 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
915 file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
916 spool_directory, message_id, message_id);
917 scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
919 if (scanner_record == NULL) {
922 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
923 return m_errlog_defer(scanent,
924 string_sprintf("opening scanner output file (%s) failed: %s.",
925 file_name, strerror(err)));
928 /* look for trigger while recording output */
929 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) {
930 if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
933 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
934 return m_errlog_defer(scanent,
935 string_sprintf("short write on scanner output file (%s).", file_name));
937 /* try trigger match */
938 if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
942 (void)fclose(scanner_record);
944 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
948 /* setup default virus name */
949 malware_name = US"unknown";
951 /* re-open the scanner output file, look for name match */
952 scanner_record = fopen(CS file_name, "rb");
953 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) {
955 if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
958 (void)fclose(scanner_record);
960 else /* no virus found */
965 case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
970 uschar av_buffer[1024];
972 /* pass the scan directory to sophie */
973 file_name = string_copy(eml_filename);
974 if ((p = Ustrrchr(file_name, '/')))
977 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
978 scanner_name, scanner_options);
980 if ( write(sock, file_name, Ustrlen(file_name)) < 0
981 || write(sock, "\n", 1) != 1
983 return m_errlog_defer_3(scanent,
984 string_sprintf("unable to write to UNIX socket (%s)", scanner_options),
987 /* wait for result */
988 memset(av_buffer, 0, sizeof(av_buffer));
989 if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0))
990 return m_errlog_defer_3(scanent,
991 string_sprintf("unable to read from UNIX socket (%s)", scanner_options),
995 if (av_buffer[0] == '1') {
996 uschar * s = Ustrchr(av_buffer, '\n');
999 malware_name = string_copy(&av_buffer[2]);
1001 else if (!strncmp(CS av_buffer, "-1", 2))
1002 return m_errlog_defer_3(scanent, US"scanner reported error", sock);
1003 else /* all ok, no virus */
1004 malware_name = NULL;
1009 case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
1011 /* This code was originally contributed by David Saez */
1012 /* There are three scanning methods available to us:
1013 * (1) Use the SCAN command, pointing to a file in the filesystem
1014 * (2) Use the STREAM command, send the data on a separate port
1015 * (3) Use the zINSTREAM command, send the data inline
1016 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1017 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1018 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1019 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
1020 * WITH_OLD_CLAMAV_STREAM is defined.
1021 * See Exim bug 926 for details. */
1023 uschar *p, *vname, *result_tag, *response_end;
1027 uschar av_buffer[1024];
1028 uschar *hostname = US"";
1030 uschar *clamav_fbuf;
1031 int clam_fd, result;
1033 BOOL use_scan_command = FALSE;
1034 clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
1036 int num_servers = 0;
1037 #ifdef WITH_OLD_CLAMAV_STREAM
1038 uschar av_buffer2[1024];
1041 uint32_t send_size, send_final_zeroblock;
1044 if (*scanner_options == '/')
1045 /* Local file; so we def want to use_scan_command and don't want to try
1046 * passing IP/port combinations */
1047 use_scan_command = TRUE;
1049 const uschar *address = scanner_options;
1050 uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
1052 /* Go through the rest of the list of host/port and construct an array
1053 * of servers to try. The first one is the bit we just passed from
1054 * scanner_options so process that first and then scan the remainder of
1055 * the address buffer */
1057 clamd_address_container *this_clamd;
1059 /* The 'local' option means use the SCAN command over the network
1060 * socket (ie common file storage in use) */
1061 if (strcmpic(address,US"local") == 0) {
1062 use_scan_command = TRUE;
1066 /* XXX: If unsuccessful we should free this memory */
1068 (clamd_address_container *)store_get(sizeof(clamd_address_container));
1070 /* extract host and port part */
1071 if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
1072 this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
1073 (void) m_errlog_defer(scanent,
1074 string_sprintf("invalid address '%s'", address));
1078 clamd_address_vector[num_servers] = this_clamd;
1080 if (num_servers >= MAX_CLAMD_SERVERS) {
1081 (void) m_errlog_defer(scanent,
1082 US"More than " MAX_CLAMD_SERVERS_S " clamd servers "
1083 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1086 } while ((address = string_nextinlist(&av_scanner_work, &sep,
1088 sizeof(address_buffer))) != NULL);
1090 /* check if we have at least one server */
1092 return m_errlog_defer(scanent,
1093 US"no useable server addresses in malware configuration option.");
1096 /* See the discussion of response formats below to see why we really don't
1097 like colons in filenames when passing filenames to ClamAV. */
1098 if (use_scan_command && Ustrchr(eml_filename, ':'))
1099 return m_errlog_defer(scanent,
1100 string_sprintf("local/SCAN mode incompatible with" \
1101 " : in path to email filename [%s]", eml_filename));
1103 /* We have some network servers specified */
1106 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1107 * only supports AF_INET, but we should probably be looking to the
1108 * future and rewriting this to be protocol-independent anyway. */
1110 while ( num_servers > 0 ) {
1111 /* Randomly pick a server to start with */
1112 current_server = random_number( num_servers );
1114 debug_printf("trying server name %s, port %u\n",
1115 clamd_address_vector[current_server]->tcp_addr,
1116 clamd_address_vector[current_server]->tcp_port);
1118 /* Lookup the host. This is to ensure that we connect to the same IP
1119 * on both connections (as one host could resolve to multiple ips) */
1120 sock= m_tcpsocket(clamd_address_vector[current_server]->tcp_addr,
1121 clamd_address_vector[current_server]->tcp_port,
1122 &connhost, &errstr);
1124 /* Connection successfully established with a server */
1125 hostname = clamd_address_vector[current_server]->tcp_addr;
1129 (void) m_errlog_defer(scanent, errstr);
1131 /* Remove the server from the list. XXX We should free the memory */
1134 for( i = current_server; i < num_servers; i++ )
1135 clamd_address_vector[i] = clamd_address_vector[i+1];
1138 if ( num_servers == 0 )
1139 return m_errlog_defer(scanent, US"all servers failed");
1142 if ((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1143 return m_errlog_defer(scanent, errstr);
1146 /* have socket in variable "sock"; command to use is semi-independent of
1147 * the socket protocol. We use SCAN if is local (either Unix/local
1148 * domain socket, or explicitly told local) else we stream the data.
1149 * How we stream the data depends upon how we were built. */
1151 if (!use_scan_command) {
1153 #ifdef WITH_OLD_CLAMAV_STREAM
1154 /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
1155 * that port on a second connection; then in the scan-method-neutral
1156 * part, read the response back on the original connection. */
1158 DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
1161 /* Pass the string to ClamAV (7 = "STREAM\n") */
1162 if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0)
1163 return m_errlog_defer(scanent, errstr);
1165 memset(av_buffer2, 0, sizeof(av_buffer2));
1166 bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1169 return m_errlog_defer_3(scanent,
1170 string_sprintf("unable to read PORT from socket (%s)",
1174 if (bread == sizeof(av_buffer2))
1175 return m_errlog_defer_3(scanent, "buffer too small", sock);
1178 return m_errlog_defer_3(scanent, "ClamAV returned null", sock);
1180 av_buffer2[bread] = '\0';
1181 if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 )
1182 return m_errlog_defer_3(scanent,
1183 string_sprintf("Expected port information from clamd, got '%s'",
1187 sockData = m_tcpsocket(connhost.address, port, NULL, &errstr);
1189 return m_errlog_defer_3(scanent, errstr, sock);
1191 #define CLOSE_SOCKDATA (void)close(sockData)
1192 #else /* WITH_OLD_CLAMAV_STREAM not defined */
1193 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1194 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1197 DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1200 /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
1201 if (send(sock, "zINSTREAM", 10, 0) < 0)
1202 return m_errlog_defer_3(scanent,
1203 string_sprintf("unable to send zINSTREAM to socket (%s)",
1207 #define CLOSE_SOCKDATA /**/
1210 /* calc file size */
1211 if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) {
1214 return m_errlog_defer_3(scanent,
1215 string_sprintf("can't open spool file %s: %s",
1216 eml_filename, strerror(err)),
1219 if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) {
1221 CLOSE_SOCKDATA; (void)close(clam_fd);
1222 return m_errlog_defer_3(scanent,
1223 string_sprintf("can't seek spool file %s: %s",
1224 eml_filename, strerror(err)),
1227 lseek(clam_fd, 0, SEEK_SET);
1229 if (!(clamav_fbuf = (uschar *) malloc (fsize))) {
1230 CLOSE_SOCKDATA; (void)close(clam_fd);
1231 return m_errlog_defer_3(scanent,
1232 string_sprintf("unable to allocate memory %u for file (%s)",
1233 fsize, eml_filename),
1237 if ((result = read(clam_fd, clamav_fbuf, fsize)) < 0) {
1239 free(clamav_fbuf); CLOSE_SOCKDATA; (void)close(clam_fd);
1240 return m_errlog_defer_3(scanent,
1241 string_sprintf("can't read spool file %s: %s",
1242 eml_filename, strerror(err)),
1245 (void)close(clam_fd);
1247 /* send file body to socket */
1248 #ifdef WITH_OLD_CLAMAV_STREAM
1249 if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1250 free(clamav_fbuf); CLOSE_SOCKDATA;
1251 return m_errlog_defer_3(scanent,
1252 string_sprintf("unable to send file body to socket (%s:%u)",
1257 send_size = htonl(fsize);
1258 send_final_zeroblock = 0;
1259 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1260 (send(sock, clamav_fbuf, fsize, 0) < 0) ||
1261 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1264 return m_errlog_defer_3(scanent,
1265 string_sprintf("unable to send file body to socket (%s:%u)",
1274 #undef CLOSE_SOCKDATA
1276 } else { /* use scan command */
1277 /* Send a SCAN command pointing to a filename; then in the then in the
1278 * scan-method-neutral part, read the response back */
1280 /* ================================================================= */
1282 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1283 which dates to when ClamAV needed us to break apart the email into the
1284 MIME parts (eg, with the now deprecated demime condition coming first).
1285 Some time back, ClamAV gained the ability to deconstruct the emails, so
1286 doing this would actually have resulted in the mail attachments being
1287 scanned twice, in the broken out files and from the original .eml.
1288 Since ClamAV now handles emails (and has for quite some time) we can
1289 just use the email file itself. */
1290 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1291 file_name = string_sprintf("SCAN %s\n", eml_filename);
1293 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
1294 scanner_name, scanner_options);
1296 if (send(sock, file_name, Ustrlen(file_name), 0) < 0)
1297 return m_errlog_defer_3(scanent,
1298 string_sprintf("unable to write to socket (%s)", strerror(errno)),
1301 /* Do not shut down the socket for writing; a user report noted that
1302 * clamd 0.70 does not react well to this. */
1304 /* Commands have been sent, no matter which scan method or connection
1305 * type we're using; now just read the result, independent of method. */
1307 /* Read the result */
1308 memset(av_buffer, 0, sizeof(av_buffer));
1309 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1314 return m_errlog_defer(scanent,
1315 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1317 if (bread == sizeof(av_buffer))
1318 return m_errlog_defer(scanent, US"buffer too small");
1319 /* We're now assured of a NULL at the end of av_buffer */
1321 /* Check the result. ClamAV returns one of two result formats.
1322 In the basic mode, the response is of the form:
1323 infected: -> "<filename>: <virusname> FOUND"
1324 not-infected: -> "<filename>: OK"
1325 error: -> "<filename>: <errcode> ERROR
1326 If the ExtendedDetectionInfo option has been turned on, then we get:
1327 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1328 for the infected case. Compare:
1329 /tmp/eicar.com: Eicar-Test-Signature FOUND
1330 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1332 In the streaming case, clamd uses the filename "stream" which you should
1333 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1334 client app will replace "stream" with the original filename before returning
1335 results to stdout, but the trace shows the data).
1337 We will assume that the pathname passed to clamd from Exim does not contain
1338 a colon. We will have whined loudly above if the eml_filename does (and we're
1339 passing a filename to clamd). */
1342 return m_errlog_defer(scanent, US"ClamAV returned null");
1344 /* strip newline at the end (won't be present for zINSTREAM)
1345 (also any trailing whitespace, which shouldn't exist, but we depend upon
1346 this below, so double-check) */
1347 p = av_buffer + Ustrlen(av_buffer) - 1;
1348 if (*p == '\n') *p = '\0';
1350 DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
1352 while (isspace(*--p) && (p > av_buffer))
1357 /* colon in returned output? */
1358 if((p = Ustrchr(av_buffer,':')) == NULL)
1359 return m_errlog_defer(scanent,
1360 string_sprintf("ClamAV returned malformed result (missing colon): %s",
1363 /* strip filename */
1364 while (*p && isspace(*++p)) /**/;
1367 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1368 but we should at least be resistant to it. */
1369 p = Ustrrchr(vname, ' ');
1370 result_tag = p ? p+1 : vname;
1372 if (Ustrcmp(result_tag, "FOUND") == 0) {
1373 /* p should still be the whitespace before the result_tag */
1374 while (isspace(*p)) --p;
1376 /* Strip off the extended information too, which will be in parens
1377 after the virus name, with no intervening whitespace. */
1379 /* "(hash:size)", so previous '(' will do; if not found, we have
1380 a curious virus name, but not an error. */
1381 p = Ustrrchr(vname, '(');
1385 malware_name = string_copy(vname);
1386 DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
1388 } else if (Ustrcmp(result_tag, "ERROR") == 0)
1389 return m_errlog_defer(scanent,
1390 string_sprintf("ClamAV returned: %s", av_buffer));
1392 else if (Ustrcmp(result_tag, "OK") == 0) {
1393 /* Everything should be OK */
1394 malware_name = NULL;
1395 DEBUG(D_acl) debug_printf("Malware not found\n");
1398 return m_errlog_defer(scanent,
1399 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1404 case M_SOCK: /* "sock" scanner type ------------------------------------- */
1405 /* This code was derived by Martin Poole from the clamd code contributed
1406 by David Saez and the cmdline code
1410 uschar * commandline;
1411 uschar av_buffer[1024];
1412 uschar * linebuffer;
1413 uschar * sockline_scanner;
1414 uschar sockline_scanner_default[] = "%s\n";
1415 const pcre *sockline_trig_re;
1416 const pcre *sockline_name_re;
1418 /* find scanner command line */
1419 if ((sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
1421 { /* check for no expansions apart from one %s */
1422 char * s = index(CS sockline_scanner, '%');
1424 if ((*s != 's' && *s != '%') || index(s+1, '%'))
1425 return m_errlog_defer_3(scanent,
1426 US"unsafe sock scanner call spec", sock);
1429 sockline_scanner = sockline_scanner_default;
1431 /* find scanner output trigger */
1432 sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1433 "missing trigger specification", &errstr);
1434 if (!sockline_trig_re)
1435 return m_errlog_defer_3(scanent, errstr, sock);
1437 /* find virus name regex */
1438 sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1439 "missing virus name regex specification", &errstr);
1440 if (!sockline_name_re)
1441 return m_errlog_defer_3(scanent, errstr, sock);
1443 /* prepare scanner call - security depends on expansions check above */
1444 commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
1445 commandline = string_sprintf( CS sockline_scanner, CS commandline);
1448 /* Pass the command string to the socket */
1449 if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
1450 return m_errlog_defer(scanent, errstr);
1452 /* Read the result */
1453 memset(av_buffer, 0, sizeof(av_buffer));
1454 bread = read(sock, av_buffer, sizeof(av_buffer));
1457 return m_errlog_defer_3(scanent,
1458 string_sprintf("unable to read from socket (%s)", strerror(errno)),
1461 if (bread == sizeof(av_buffer))
1462 return m_errlog_defer_3(scanent, US"buffer too small", sock);
1463 linebuffer = string_copy(av_buffer);
1465 /* try trigger match */
1466 if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) {
1467 if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
1468 malware_name = US "unknown";
1470 else /* no virus found */
1471 malware_name = NULL;
1475 case M_MKSD: /* "mksd" scanner type ------------------------------------- */
1477 char *mksd_options_end;
1478 int mksd_maxproc = 1; /* default, if no option supplied */
1482 if (scanner_options) {
1483 mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
1484 if ( *scanner_options == '\0'
1485 || *mksd_options_end != '\0'
1487 || mksd_maxproc > 32
1489 return m_errlog_defer(scanent,
1490 string_sprintf("invalid option '%s'", scanner_options));
1493 if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
1494 return m_errlog_defer(scanent, errstr);
1496 malware_name = NULL;
1498 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
1500 if ((retval = mksd_scan_packed(scanent, sock, eml_filename)) != OK) {
1509 (void) close (sock);
1510 malware_ok = TRUE; /* set "been here, done that" marker */
1513 /* match virus name against pattern (caseless ------->----------v) */
1514 if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1515 DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
1523 /* simple wrapper for reading lines from sockets */
1525 recv_line(int sock, uschar *buffer, int size)
1529 memset(buffer,0,size);
1531 while(recv(sock,p,1,0) > -1) {
1532 if ((p-buffer) > (size-2)) break;
1533 if (*p == '\n') break;
1534 if (*p != '\r') p++;
1542 /* ============= private routines for the "mksd" scanner type ============== */
1544 #include <sys/uio.h>
1547 mksd_writev (int sock, struct iovec *iov, int iovcnt)
1553 i = writev (sock, iov, iovcnt);
1554 while ((i < 0) && (errno == EINTR));
1556 (void) malware_errlog_defer(US"unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1561 if (i >= iov->iov_len) {
1568 iov->iov_base = CS iov->iov_base + i;
1575 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1581 if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1582 (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1587 /* offset == av_buffer_size -> buffer full */
1588 if (offset == av_buffer_size) {
1589 (void) malware_errlog_defer(US"malformed reply received from mksd");
1592 } while (av_buffer[offset-1] != '\n');
1594 av_buffer[offset] = '\0';
1599 mksd_parse_line(struct scan * scanent, char *line)
1609 if ((p = strchr (line, '\n')) != NULL)
1611 return m_errlog_defer(scanent,
1612 string_sprintf("scanner failed: %s", line));
1615 if ((p = strchr (line, '\n')) != NULL) {
1617 if (((p-line) > 5) && (line[3] == ' '))
1618 if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1620 malware_name = string_copy(US line+4);
1624 return m_errlog_defer(scanent,
1625 string_sprintf("malformed reply received: %s", line));
1630 mksd_scan_packed(struct scan * scanent, int sock, uschar *scan_filename)
1632 struct iovec iov[3];
1633 const char *cmd = "MSQ\n";
1634 uschar av_buffer[1024];
1636 iov[0].iov_base = (void *) cmd;
1638 iov[1].iov_base = CS scan_filename;
1639 iov[1].iov_len = Ustrlen(scan_filename);
1640 iov[2].iov_base = (void *) (cmd + 3);
1643 if (mksd_writev (sock, iov, 3) < 0)
1646 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1649 return mksd_parse_line (scanent, CS av_buffer);
1652 #endif /*WITH_CONTENT_SCAN*/