1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015
7 * Copyright (c) The Exim Maintainers 2017 - 2018
10 /* Code for calling virus (malware) scanners. Called from acl.c. */
13 #ifdef WITH_CONTENT_SCAN /* entire file */
15 typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL,
16 M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD, M_AVAST, M_FPROT6D} scanner_t;
17 typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t;
22 const uschar * options_default;
26 #ifndef DISABLE_MAL_FFROTD
27 { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP },
29 #ifndef DISABLE_MAL_FFROT6D
30 { M_FPROT6D, US"f-prot6d", US"localhost 10200", MC_TCP },
32 #ifndef DISABLE_MAL_DRWEB
33 { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM },
35 #ifndef DISABLE_MAL_AVE
36 { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX },
38 #ifndef DISABLE_MAL_FSECURE
39 { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX },
41 #ifndef DISABLE_MAL_KAV
42 { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX },
44 #ifndef DISABLE_MAL_SOPHIE
45 { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX },
47 #ifndef DISABLE_MAL_CLAM
48 { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE },
50 #ifndef DISABLE_MAL_MKS
51 { M_MKSD, US"mksd", NULL, MC_NONE },
53 #ifndef DISABLE_MAL_AVAST
54 { M_AVAST, US"avast", US"/var/run/avast/scan.sock", MC_STRM },
56 #ifndef DISABLE_MAL_SOCK
57 { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM },
59 #ifndef DISABLE_MAL_CMDLINE
60 { M_CMDL, US"cmdline", NULL, MC_NONE },
62 { -1, NULL, NULL, MC_NONE } /* end-marker */
65 /******************************************************************************/
66 # ifdef MACRO_PREDEF /* build solely to predefine macros */
68 # include "macro_predef.h"
71 features_malware(void)
77 spf(buf, sizeof(buf), US"_HAVE_MALWARE_");
79 for (sc = m_scans; sc->scancode != -1; sc++)
81 for(s = sc->name, t = buf+14; *s; s++) if (*s != '-') *t++ = toupper(*s);
83 builtin_macro_create(buf);
87 /******************************************************************************/
88 # else /*!MACRO_PREDEF, main build*/
91 #define MALWARE_TIMEOUT 120 /* default timeout, seconds */
93 static const uschar * malware_regex_default = US ".+";
94 static const pcre * malware_default_re = NULL;
98 #ifndef DISABLE_MAL_CLAM
99 /* The maximum number of clamd servers that are supported in the configuration */
100 # define MAX_CLAMD_SERVERS 32
101 # define MAX_CLAMD_SERVERS_S "32"
103 typedef struct clamd_address {
111 #ifndef DISABLE_MAL_DRWEB
112 # define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */
113 # define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */
114 # define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */
116 # define DERR_READ_ERR (1<<0) /* read error */
117 # define DERR_NOMEMORY (1<<2) /* no memory */
118 # define DERR_TIMEOUT (1<<9) /* scan timeout has run out */
119 # define DERR_BAD_CALL (1<<15) /* wrong command */
121 static const uschar * drweb_re_str = US "infected\\swith\\s*(.+?)$";
122 static const pcre * drweb_re = NULL;
125 #ifndef DISABLE_MAL_FSECURE
126 static const uschar * fsec_re_str = US "\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$";
127 static const pcre * fsec_re = NULL;
130 #ifndef DISABLE_MAL_KAV
131 static const uschar * kav_re_sus_str = US "suspicion:\\s*(.+?)\\s*$";
132 static const uschar * kav_re_inf_str = US "infected:\\s*(.+?)\\s*$";
133 static const pcre * kav_re_sus = NULL;
134 static const pcre * kav_re_inf = NULL;
137 #ifndef DISABLE_MAL_AVAST
138 static const uschar * ava_re_clean_str = US "(?!\\\\)\\t\\[\\+\\]";
139 static const uschar * ava_re_virus_str = US "(?!\\\\)\\t\\[L\\]\\d\\.\\d\\t\\d\\s(.*)";
140 static const pcre * ava_re_clean = NULL;
141 static const pcre * ava_re_virus = NULL;
144 #ifndef DISABLE_MAL_FFROT6D
145 static const uschar * fprot6d_re_error_str = US "^\\d+\\s<(.+?)>$";
146 static const uschar * fprot6d_re_virus_str = US "^\\d+\\s<infected:\\s+(.+?)>\\s+.+$";
147 static const pcre * fprot6d_re_error = NULL;
148 static const pcre * fprot6d_re_virus = NULL;
153 /******************************************************************************/
155 /* Routine to check whether a system is big- or little-endian.
156 Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html
157 Needed for proper kavdaemon implementation. Sigh. */
158 #define BIG_MY_ENDIAN 0
159 #define LITTLE_MY_ENDIAN 1
160 static int test_byte_order(void);
164 short int word = 0x0001;
165 char *byte = CS &word;
166 return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN);
169 BOOL malware_ok = FALSE;
171 /* Gross hacks for the -bmalware option; perhaps we should just create
172 the scan directory normally for that case, but look into rigging up the
173 needed header variables if not already set on the command-line? */
174 extern int spool_mbox_ok;
175 extern uschar spooled_message_id[MESSAGE_ID_LENGTH+1];
180 malware_errlog_defer(const uschar * str)
182 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
187 m_errlog_defer(struct scan * scanent, const uschar * hostport,
190 return malware_errlog_defer(string_sprintf("%s %s : %s",
191 scanent->name, hostport ? hostport : CUS"", str));
194 m_errlog_defer_3(struct scan * scanent, const uschar * hostport,
195 const uschar * str, int fd_to_close)
197 (void) close(fd_to_close);
198 return m_errlog_defer(scanent, hostport, str);
201 /*************************************************/
203 #ifndef DISABLE_MAL_CLAM
204 /* Only used by the Clamav code, which is working from a list of servers and
205 uses the returned in_addr to get a second connection to the same system.
208 m_tcpsocket(const uschar * hostname, unsigned int port,
209 host_item * host, uschar ** errstr, const blob * fastopen_blob)
211 return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5,
212 host, errstr, fastopen_blob);
217 m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
219 if (send(sock, buf, cnt, 0) < 0)
223 *errstr = string_sprintf("unable to send to socket (%s): %s",
231 m_pcre_compile(const uschar * re, uschar ** errstr)
233 const uschar * rerror;
237 cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
239 *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
240 re, rerror, roffset);
245 m_pcre_exec(const pcre * cre, uschar * text)
248 int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
249 ovector, nelem(ovector));
250 uschar * substr = NULL;
251 if (i >= 2) /* Got it */
252 pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
257 m_pcre_nextinlist(const uschar ** list, int * sep,
258 char * listerr, uschar ** errstr)
260 const uschar * list_ele;
261 const pcre * cre = NULL;
263 if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
264 *errstr = US listerr;
267 DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "RE: ",
268 string_printing(list_ele));
269 cre = m_pcre_compile(CUS list_ele, errstr);
275 Simple though inefficient wrapper for reading a line. Drop CRs and the
276 trailing newline. Can return early on buffer full. Null-terminate.
277 Apply initial timeout if no data ready.
279 Return: number of chars - zero for an empty line
281 -2 on timeout or error
284 recv_line(int fd, uschar * buffer, int bsize, int tmo)
290 if (!fd_ready(fd, tmo-time(NULL)))
293 /*XXX tmo handling assumes we always get a whole line */
296 while ((rcv = read(fd, p, 1)) > 0)
299 if (p-buffer > bsize-2) break;
300 if (*p == '\n') break;
305 DEBUG(D_acl) debug_printf_indent("Malware scan: read %s (%s)\n",
306 rcv==0 ? "EOF" : "error", strerror(errno));
307 return rcv==0 ? -1 : -2;
311 DEBUG(D_acl) debug_printf_indent("Malware scan: read '%s'\n", buffer);
315 /* return TRUE iff size as requested */
317 recv_len(int sock, void * buf, int size, int tmo)
319 return fd_ready(sock, tmo-time(NULL))
320 ? recv(sock, buf, size, 0) == size
326 #ifndef DISABLE_MAL_MKS
327 /* ============= private routines for the "mksd" scanner type ============== */
329 # include <sys/uio.h>
332 mksd_writev (int sock, struct iovec * iov, int iovcnt)
339 i = writev (sock, iov, iovcnt);
340 while (i < 0 && errno == EINTR);
343 (void) malware_errlog_defer(
344 US"unable to write to mksd UNIX socket (/var/run/mksd/socket)");
347 for (;;) /* check for short write */
348 if (i >= iov->iov_len)
358 iov->iov_base = CS iov->iov_base + i;
365 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size, int tmo)
372 i = ip_recv(sock, av_buffer+offset, av_buffer_size-offset, tmo-time(NULL));
375 (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)");
380 /* offset == av_buffer_size -> buffer full */
381 if (offset == av_buffer_size)
383 (void) malware_errlog_defer(US"malformed reply received from mksd");
386 } while (av_buffer[offset-1] != '\n');
388 av_buffer[offset] = '\0';
393 mksd_parse_line(struct scan * scanent, char * line)
404 if ((p = strchr (line, '\n')) != NULL)
406 return m_errlog_defer(scanent, NULL,
407 string_sprintf("scanner failed: %s", line));
410 if ((p = strchr (line, '\n')) != NULL)
415 && (p = strchr(line+4, ' ')) != NULL
420 malware_name = string_copy(US line+4);
424 return m_errlog_defer(scanent, NULL,
425 string_sprintf("malformed reply received: %s", line));
430 mksd_scan_packed(struct scan * scanent, int sock, const uschar * scan_filename,
434 const char *cmd = "MSQ\n";
435 uschar av_buffer[1024];
437 iov[0].iov_base = (void *) cmd;
439 iov[1].iov_base = (void *) scan_filename;
440 iov[1].iov_len = Ustrlen(scan_filename);
441 iov[2].iov_base = (void *) (cmd + 3);
444 if (mksd_writev (sock, iov, 3) < 0)
447 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer), tmo) < 0)
450 return mksd_parse_line (scanent, CS av_buffer);
455 #ifndef DISABLE_MAL_CLAM
457 clamd_option(clamd_address * cd, const uschar * optstr, int * subsep)
462 while ((s = string_nextinlist(&optstr, subsep, NULL, 0)))
463 if (Ustrncmp(s, "retry=", 6) == 0)
465 int sec = readconf_readtime((s += 6), '\0', FALSE);
478 /*************************************************
479 * Scan content for malware *
480 *************************************************/
482 /* This is an internal interface for scanning an email; the normal interface
483 is via malware(), or there's malware_in_file() used for testing/debugging.
486 malware_re match condition for "malware="
487 scan_filename the file holding the email to be scanned, if we're faking
488 this up for the -bmalware test, else NULL
489 timeout if nonzero, non-default timeoutl
491 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
492 where true means malware was found (condition applies)
495 malware_internal(const uschar * malware_re, const uschar * scan_filename,
499 const uschar *av_scanner_work = av_scanner;
500 uschar *scanner_name;
501 unsigned long mbox_size;
505 struct scan * scanent;
506 const uschar * scanner_options;
509 uschar * eml_filename, * eml_dir;
512 return FAIL; /* empty means "don't match anything" */
514 /* Ensure the eml mbox file is spooled up */
516 if (!(mbox_file = spool_mbox(&mbox_size, scan_filename, &eml_filename)))
517 return malware_errlog_defer(US"error while creating mbox spool file");
519 /* None of our current scanners need the mbox file as a stream (they use
520 the name), so we can close it right away. Get the directory too. */
522 (void) fclose(mbox_file);
523 eml_dir = string_copyn(eml_filename, Ustrrchr(eml_filename, '/') - eml_filename);
525 /* parse 1st option */
526 if (strcmpic(malware_re, US"false") == 0 || Ustrcmp(malware_re,"0") == 0)
527 return FAIL; /* explicitly no matching */
529 /* special cases (match anything except empty) */
530 if ( strcmpic(malware_re,US"true") == 0
531 || Ustrcmp(malware_re,"*") == 0
532 || Ustrcmp(malware_re,"1") == 0
535 if ( !malware_default_re
536 && !(malware_default_re = m_pcre_compile(malware_regex_default, &errstr)))
537 return malware_errlog_defer(errstr);
538 malware_re = malware_regex_default;
539 re = malware_default_re;
542 /* compile the regex, see if it works */
543 else if (!(re = m_pcre_compile(malware_re, &errstr)))
544 return malware_errlog_defer(errstr);
546 /* if av_scanner starts with a dollar, expand it first */
547 if (*av_scanner == '$')
549 if (!(av_scanner_work = expand_string(av_scanner)))
550 return malware_errlog_defer(
551 string_sprintf("av_scanner starts with $, but expansion failed: %s",
552 expand_string_message));
555 debug_printf_indent("Expanded av_scanner global: %s\n", av_scanner_work);
556 /* disable result caching in this case */
561 /* Do not scan twice (unless av_scanner is dynamic). */
564 /* find the scanner type from the av_scanner option */
565 if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
566 return malware_errlog_defer(US"av_scanner configuration variable is empty");
567 if (!timeout) timeout = MALWARE_TIMEOUT;
568 tmo = time(NULL) + timeout;
570 for (scanent = m_scans; ; scanent++)
573 return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
575 if (strcmpic(scanner_name, US scanent->name) != 0)
577 DEBUG(D_acl) debug_printf_indent("Malware scan: %s tmo=%s\n",
578 scanner_name, readconf_printtime(timeout));
580 if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
581 scanner_options = scanent->options_default;
582 if (scanent->conn == MC_NONE)
585 DEBUG(D_acl) debug_printf_indent("%15s%10s%s\n", "", "socket: ", scanner_options);
586 switch(scanent->conn)
588 case MC_TCP: sock = ip_tcpsocket(scanner_options, &errstr, 5); break;
589 case MC_UNIX: sock = ip_unixsocket(scanner_options, &errstr); break;
590 case MC_STRM: sock = ip_streamsocket(scanner_options, &errstr, 5); break;
591 default: /* compiler quietening */ break;
594 return m_errlog_defer(scanent, CUS callout_address, errstr);
598 switch (scanent->scancode)
600 #ifndef DISABLE_MAL_FFROTD
601 case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
603 uschar *fp_scan_option;
604 unsigned int detected=0, par_count=0;
605 uschar * scanrequest;
606 uschar buf[32768], *strhelper, *strhelper2;
607 uschar * malware_name_internal = NULL;
610 scanrequest = string_sprintf("GET %s", eml_filename);
612 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
615 scanrequest = string_sprintf("%s%s%s", scanrequest,
616 par_count ? "%20" : "?", fp_scan_option);
619 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
620 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n",
621 scanner_name, scanrequest);
623 /* send scan request */
624 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
625 return m_errlog_defer(scanent, CUS callout_address, errstr);
627 while ((len = recv_line(sock, buf, sizeof(buf), tmo)) >= 0)
630 if (Ustrstr(buf, US"<detected type=\"") != NULL)
632 else if (detected && (strhelper = Ustrstr(buf, US"<name>")))
634 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL)
637 malware_name_internal = string_copy(strhelper+6);
640 else if (Ustrstr(buf, US"<summary code=\""))
642 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
643 ? malware_name_internal : NULL;
656 #ifndef DISABLE_MAL_FFROT6D
657 case M_FPROT6D: /* "f-prot6d" scanner type ----------------------------------- */
662 uschar * scanrequest;
663 uschar av_buffer[1024];
665 if ((!fprot6d_re_virus && !(fprot6d_re_virus = m_pcre_compile(fprot6d_re_virus_str, &errstr)))
666 || (!fprot6d_re_error && !(fprot6d_re_error = m_pcre_compile(fprot6d_re_error_str, &errstr))))
667 return malware_errlog_defer(errstr);
669 scanrequest = string_sprintf("SCAN FILE %s\n", eml_filename);
670 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n",
671 scanner_name, scanrequest);
673 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest), &errstr) < 0)
674 return m_errlog_defer(scanent, CUS callout_address, errstr);
676 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL));
679 return m_errlog_defer_3(scanent, CUS callout_address,
680 string_sprintf("unable to read from socket (%s)", strerror(errno)),
683 if (bread == sizeof(av_buffer))
684 return m_errlog_defer_3(scanent, CUS callout_address,
685 US"buffer too small", sock);
687 av_buffer[bread] = '\0';
688 linebuffer = string_copy(av_buffer);
690 m_sock_send(sock, US"QUIT\n", 5, 0);
692 if ((e = m_pcre_exec(fprot6d_re_error, linebuffer)))
693 return m_errlog_defer_3(scanent, CUS callout_address,
694 string_sprintf("scanner reported error (%s)", e), sock);
696 if (!(malware_name = m_pcre_exec(fprot6d_re_virus, linebuffer)))
703 #ifndef DISABLE_MAL_DRWEB
704 case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
705 /* v0.1 - added support for tcp sockets */
706 /* v0.0 - initial release -- support for unix sockets */
710 unsigned int fsize_uint;
711 uschar * tmpbuf, *drweb_fbuf;
712 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
713 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
715 /* prepare variables */
716 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
717 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
719 if (*scanner_options != '/')
722 if ((drweb_fd = open(CCS eml_filename, O_RDONLY)) == -1)
723 return m_errlog_defer_3(scanent, NULL,
724 string_sprintf("can't open spool file %s: %s",
725 eml_filename, strerror(errno)),
728 if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1)
731 badseek: err = errno;
732 (void)close(drweb_fd);
733 return m_errlog_defer_3(scanent, NULL,
734 string_sprintf("can't seek spool file %s: %s",
735 eml_filename, strerror(err)),
738 fsize_uint = (unsigned int) fsize;
739 if ((off_t)fsize_uint != fsize)
741 (void)close(drweb_fd);
742 return m_errlog_defer_3(scanent, NULL,
743 string_sprintf("seeking spool file %s, size overflow",
747 drweb_slen = htonl(fsize);
748 if (lseek(drweb_fd, 0, SEEK_SET) < 0)
751 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s remote scan [%s]\n",
752 scanner_name, scanner_options);
754 /* send scan request */
755 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
756 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
757 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
758 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0))
760 (void)close(drweb_fd);
761 return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf(
762 "unable to send commands to socket (%s)", scanner_options),
766 if (!(drweb_fbuf = US malloc(fsize_uint)))
768 (void)close(drweb_fd);
769 return m_errlog_defer_3(scanent, NULL,
770 string_sprintf("unable to allocate memory %u for file (%s)",
771 fsize_uint, eml_filename),
775 if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1)
778 (void)close(drweb_fd);
780 return m_errlog_defer_3(scanent, NULL,
781 string_sprintf("can't read spool file %s: %s",
782 eml_filename, strerror(err)),
785 (void)close(drweb_fd);
787 /* send file body to socket */
788 if (send(sock, drweb_fbuf, fsize, 0) < 0)
791 return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf(
792 "unable to send file body to socket (%s)", scanner_options),
798 drweb_slen = htonl(Ustrlen(eml_filename));
800 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s local scan [%s]\n",
801 scanner_name, scanner_options);
803 /* send scan request */
804 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
805 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
806 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
807 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
808 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0))
809 return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf(
810 "unable to send commands to socket (%s)", scanner_options),
814 /* wait for result */
815 if (!recv_len(sock, &drweb_rc, sizeof(drweb_rc), tmo))
816 return m_errlog_defer_3(scanent, CUS callout_address,
817 US"unable to read return code", sock);
818 drweb_rc = ntohl(drweb_rc);
820 if (!recv_len(sock, &drweb_vnum, sizeof(drweb_vnum), tmo))
821 return m_errlog_defer_3(scanent, CUS callout_address,
822 US"unable to read the number of viruses", sock);
823 drweb_vnum = ntohl(drweb_vnum);
825 /* "virus(es) found" if virus number is > 0 */
831 /* setup default virus name */
832 malware_name = US"unknown";
834 /* set up match regex */
836 drweb_re = m_pcre_compile(drweb_re_str, &errstr);
838 /* read and concatenate virus names into one string */
839 for (i = 0; i < drweb_vnum; i++)
843 /* read the size of report */
844 if (!recv_len(sock, &drweb_slen, sizeof(drweb_slen), tmo))
845 return m_errlog_defer_3(scanent, CUS callout_address,
846 US"cannot read report size", sock);
847 drweb_slen = ntohl(drweb_slen);
848 tmpbuf = store_get(drweb_slen);
850 /* read report body */
851 if (!recv_len(sock, tmpbuf, drweb_slen, tmo))
852 return m_errlog_defer_3(scanent, CUS callout_address,
853 US"cannot read report string", sock);
854 tmpbuf[drweb_slen] = '\0';
856 /* try matcher on the line, grab substring */
857 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
858 ovector, nelem(ovector));
861 const char * pre_malware_nb;
863 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
865 if (i==0) /* the first name we just copy to malware_name */
866 g = string_cat(NULL, US pre_malware_nb);
868 /*XXX could be string_append_listele? */
869 else /* concatenate each new virus name to previous */
870 g = string_append(g, 2, "/", pre_malware_nb);
872 pcre_free_substring(pre_malware_nb);
875 malware_name = string_from_gstring(g);
879 const char *drweb_s = NULL;
881 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
882 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
883 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
884 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
885 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
886 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
887 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
888 * and others are ignored */
890 return m_errlog_defer_3(scanent, CUS callout_address,
891 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s),
901 #ifndef DISABLE_MAL_AVE
902 case M_AVES: /* "aveserver" scanner type -------------------------------- */
907 /* read aveserver's greeting and see if it is ready (2xx greeting) */
909 recv_line(sock, buf, sizeof(buf), tmo);
911 if (buf[0] != '2') /* aveserver is having problems */
912 return m_errlog_defer_3(scanent, CUS callout_address,
913 string_sprintf("unavailable (Responded: %s).",
914 ((buf[0] != 0) ? buf : US "nothing") ),
917 /* prepare our command */
918 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
922 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s %s\n",
924 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
925 return m_errlog_defer(scanent, CUS callout_address, errstr);
929 /* read response lines, find malware name and final response */
930 while (recv_line(sock, buf, sizeof(buf), tmo) > 0)
934 if (buf[0] == '5') /* aveserver is having problems */
936 result = m_errlog_defer(scanent, CUS callout_address,
937 string_sprintf("unable to scan file %s (Responded: %s).",
941 if (Ustrncmp(buf,"322",3) == 0)
943 uschar *p = Ustrchr(&buf[4], ' ');
945 malware_name = string_copy(&buf[4]);
949 if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0)
950 return m_errlog_defer(scanent, CUS callout_address, errstr);
952 /* read aveserver's greeting and see if it is ready (2xx greeting) */
954 recv_line(sock, buf, sizeof(buf), tmo);
956 if (buf[0] != '2') /* aveserver is having problems */
957 return m_errlog_defer_3(scanent, CUS callout_address,
958 string_sprintf("unable to quit dialogue (Responded: %s).",
959 ((buf[0] != 0) ? buf : US "nothing") ),
971 #ifndef DISABLE_MAL_FSECURE
972 case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
976 uschar av_buffer[1024];
977 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
978 US"CONFIGURE\tTIMEOUT\t0\n",
979 US"CONFIGURE\tMAXARCH\t5\n",
980 US"CONFIGURE\tMIME\t1\n" };
984 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n",
985 scanner_name, scanner_options);
987 memset(av_buffer, 0, sizeof(av_buffer));
988 for (i = 0; i != nelem(cmdopt); i++)
991 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
992 return m_errlog_defer(scanent, CUS callout_address, errstr);
994 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL));
995 if (bread > 0) av_buffer[bread]='\0';
997 return m_errlog_defer_3(scanent, CUS callout_address,
998 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)),
1000 for (j = 0; j < bread; j++)
1001 if (av_buffer[j] == '\r' || av_buffer[j] == '\n')
1005 /* pass the mailfile to fsecure */
1006 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
1008 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
1009 return m_errlog_defer(scanent, CUS callout_address, errstr);
1012 /* todo also SUSPICION\t */
1014 fsec_re = m_pcre_compile(fsec_re_str, &errstr);
1016 /* read report, linewise. Apply a timeout as the Fsecure daemon
1017 sometimes wants an answer to "PING" but they won't tell us what */
1019 uschar * p = av_buffer;
1025 i = av_buffer+sizeof(av_buffer)-p;
1026 if ((bread= ip_recv(sock, p, i-1, tmo-time(NULL))) < 0)
1027 return m_errlog_defer_3(scanent, CUS callout_address,
1028 string_sprintf("unable to read result (%s)", strerror(errno)),
1031 for (p[bread] = '\0'; (q = Ustrchr(p, '\n')); p = q+1)
1035 /* Really search for virus again? */
1037 /* try matcher on the line, grab substring */
1038 malware_name = m_pcre_exec(fsec_re, p);
1040 if (Ustrstr(p, "OK\tScan ok."))
1044 /* copy down the trailing partial line then read another chunk */
1045 i = av_buffer+sizeof(av_buffer)-p;
1046 memmove(av_buffer, p, i);
1056 #ifndef DISABLE_MAL_KAV
1057 case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
1060 uschar tmpbuf[1024];
1061 uschar * scanrequest;
1063 unsigned long kav_reportlen;
1068 /* get current date and time, build scan request */
1070 /* pdp note: before the eml_filename parameter, this scanned the
1071 directory; not finding documentation, so we'll strip off the directory.
1072 The side-effect is that the test framework scanning may end up in
1073 scanning more than was requested, but for the normal interface, this is
1076 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
1077 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
1078 p = Ustrrchr(scanrequest, '/');
1082 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n",
1083 scanner_name, scanner_options);
1085 /* send scan request */
1086 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
1087 return m_errlog_defer(scanent, CUS callout_address, errstr);
1089 /* wait for result */
1090 if (!recv_len(sock, tmpbuf, 2, tmo))
1091 return m_errlog_defer_3(scanent, CUS callout_address,
1092 US"unable to read 2 bytes from socket.", sock);
1094 /* get errorcode from one nibble */
1095 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
1098 case 5: case 6: /* improper kavdaemon configuration */
1099 return m_errlog_defer_3(scanent, CUS callout_address,
1100 US"please reconfigure kavdaemon to NOT disinfect or remove infected files.",
1103 return m_errlog_defer_3(scanent, CUS callout_address,
1104 US"reported 'scanning not completed' (code 1).", sock);
1106 return m_errlog_defer_3(scanent, CUS callout_address,
1107 US"reported 'kavdaemon damaged' (code 7).", sock);
1110 /* code 8 is not handled, since it is ambiguous. It appears mostly on
1111 bounces where part of a file has been cut off */
1113 /* "virus found" return codes (2-4) */
1114 if (kav_rc > 1 && kav_rc < 5)
1116 int report_flag = 0;
1118 /* setup default virus name */
1119 malware_name = US"unknown";
1121 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
1123 /* read the report, if available */
1124 if (report_flag == 1)
1126 /* read report size */
1127 if (!recv_len(sock, &kav_reportlen, 4, tmo))
1128 return m_errlog_defer_3(scanent, CUS callout_address,
1129 US"cannot read report size", sock);
1131 /* it's possible that avp returns av_buffer[1] == 1 but the
1132 reportsize is 0 (!?) */
1133 if (kav_reportlen > 0)
1135 /* set up match regex, depends on retcode */
1138 if (!kav_re_sus) kav_re_sus = m_pcre_compile(kav_re_sus_str, &errstr);
1139 kav_re = kav_re_sus;
1143 if (!kav_re_inf) kav_re_inf = m_pcre_compile(kav_re_inf_str, &errstr);
1144 kav_re = kav_re_inf;
1147 /* read report, linewise. Using size from stream to read amount of data
1148 from same stream is safe enough. */
1149 /* coverity[tainted_data] */
1150 while (kav_reportlen > 0)
1152 if ((bread = recv_line(sock, tmpbuf, sizeof(tmpbuf), tmo)) < 0)
1154 kav_reportlen -= bread+1;
1156 /* try matcher on the line, grab substring */
1157 if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
1163 else /* no virus found */
1164 malware_name = NULL;
1170 #ifndef DISABLE_MAL_CMDLINE
1171 case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
1173 const uschar *cmdline_scanner = scanner_options;
1174 const pcre *cmdline_trigger_re;
1175 const pcre *cmdline_regex_re;
1177 uschar * commandline;
1178 void (*eximsigchld)(int);
1179 void (*eximsigpipe)(int);
1180 FILE *scanner_out = NULL;
1182 FILE *scanner_record = NULL;
1183 uschar linebuffer[32767];
1188 if (!cmdline_scanner)
1189 return m_errlog_defer(scanent, NULL, errstr);
1191 /* find scanner output trigger */
1192 cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1193 "missing trigger specification", &errstr);
1194 if (!cmdline_trigger_re)
1195 return m_errlog_defer(scanent, NULL, errstr);
1197 /* find scanner name regex */
1198 cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1199 "missing virus name regex specification", &errstr);
1200 if (!cmdline_regex_re)
1201 return m_errlog_defer(scanent, NULL, errstr);
1203 /* prepare scanner call; despite the naming, file_name holds a directory
1204 name which is documented as the value given to %s. */
1206 file_name = string_copy(eml_filename);
1207 p = Ustrrchr(file_name, '/');
1210 commandline = string_sprintf(CS cmdline_scanner, file_name);
1212 /* redirect STDERR too */
1213 commandline = string_sprintf("%s 2>&1", commandline);
1215 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n",
1216 scanner_name, commandline);
1218 /* store exims signal handlers */
1219 eximsigchld = signal(SIGCHLD,SIG_DFL);
1220 eximsigpipe = signal(SIGPIPE,SIG_DFL);
1222 if (!(scanner_out = popen(CS commandline,"r")))
1225 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
1226 return m_errlog_defer(scanent, NULL,
1227 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
1229 scanner_fd = fileno(scanner_out);
1231 file_name = string_sprintf("%s/%s_scanner_output", eml_dir, message_id);
1233 if (!(scanner_record = modefopen(file_name, "wb", SPOOL_MODE)))
1236 (void) pclose(scanner_out);
1237 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
1238 return m_errlog_defer(scanent, NULL, string_sprintf(
1239 "opening scanner output file (%s) failed: %s.",
1240 file_name, strerror(err)));
1243 /* look for trigger while recording output */
1244 while ((rcnt = recv_line(scanner_fd, linebuffer,
1245 sizeof(linebuffer), tmo)))
1252 (void) pclose(scanner_out);
1253 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
1254 return m_errlog_defer(scanent, NULL, string_sprintf(
1255 "unable to read from scanner (%s): %s",
1256 commandline, strerror(err)));
1259 if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record))
1262 (void) pclose(scanner_out);
1263 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
1264 return m_errlog_defer(scanent, NULL, string_sprintf(
1265 "short write on scanner output file (%s).", file_name));
1267 putc('\n', scanner_record);
1268 /* try trigger match */
1270 && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1)
1275 (void)fclose(scanner_record);
1276 sep = pclose(scanner_out);
1277 signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
1279 return m_errlog_defer(scanent, NULL,
1281 ? string_sprintf("running scanner failed: %s", strerror(sep))
1282 : string_sprintf("scanner returned error code: %d", sep));
1287 /* setup default virus name */
1288 malware_name = US"unknown";
1290 /* re-open the scanner output file, look for name match */
1291 scanner_record = fopen(CS file_name, "rb");
1292 while (fgets(CS linebuffer, sizeof(linebuffer), scanner_record))
1295 if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
1298 (void)fclose(scanner_record);
1300 else /* no virus found */
1301 malware_name = NULL;
1306 #ifndef DISABLE_MAL_SOPHIE
1307 case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
1312 uschar av_buffer[1024];
1314 /* pass the scan directory to sophie */
1315 file_name = string_copy(eml_filename);
1316 if ((p = Ustrrchr(file_name, '/')))
1319 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n",
1320 scanner_name, scanner_options);
1322 if ( write(sock, file_name, Ustrlen(file_name)) < 0
1323 || write(sock, "\n", 1) != 1
1325 return m_errlog_defer_3(scanent, CUS callout_address,
1326 string_sprintf("unable to write to UNIX socket (%s)", scanner_options),
1329 /* wait for result */
1330 memset(av_buffer, 0, sizeof(av_buffer));
1331 if ((bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL))) <= 0)
1332 return m_errlog_defer_3(scanent, CUS callout_address,
1333 string_sprintf("unable to read from UNIX socket (%s)", scanner_options),
1337 if (av_buffer[0] == '1') {
1338 uschar * s = Ustrchr(av_buffer, '\n');
1341 malware_name = string_copy(&av_buffer[2]);
1343 else if (!strncmp(CS av_buffer, "-1", 2))
1344 return m_errlog_defer_3(scanent, CUS callout_address,
1345 US"scanner reported error", sock);
1346 else /* all ok, no virus */
1347 malware_name = NULL;
1353 #ifndef DISABLE_MAL_CLAM
1354 case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
1356 /* This code was originally contributed by David Saez */
1357 /* There are three scanning methods available to us:
1358 * (1) Use the SCAN command, pointing to a file in the filesystem
1359 * (2) Use the STREAM command, send the data on a separate port
1360 * (3) Use the zINSTREAM command, send the data inline
1361 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1362 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1363 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1364 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM
1365 * See Exim bug 926 for details. */
1367 uschar *p, *vname, *result_tag;
1369 uschar av_buffer[1024];
1370 uschar *hostname = US"";
1372 uschar *clamav_fbuf;
1373 int clam_fd, result;
1375 unsigned int fsize_uint;
1376 BOOL use_scan_command = FALSE;
1377 clamd_address * cv[MAX_CLAMD_SERVERS];
1378 int num_servers = 0;
1379 uint32_t send_size, send_final_zeroblock;
1382 /*XXX if unixdomain socket, only one server supported. Needs fixing;
1383 there's no reason we should not mix local and remote servers */
1385 if (*scanner_options == '/')
1388 const uschar * sublist;
1391 /* Local file; so we def want to use_scan_command and don't want to try
1392 * passing IP/port combinations */
1393 use_scan_command = TRUE;
1394 cd = (clamd_address *) store_get(sizeof(clamd_address));
1396 /* extract socket-path part */
1397 sublist = scanner_options;
1398 cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0);
1401 if (clamd_option(cd, sublist, &subsep) != OK)
1402 return m_errlog_defer(scanent, NULL,
1403 string_sprintf("bad option '%s'", scanner_options));
1408 /* Go through the rest of the list of host/port and construct an array
1409 * of servers to try. The first one is the bit we just passed from
1410 * scanner_options so process that first and then scan the remainder of
1411 * the address buffer */
1415 const uschar * sublist;
1419 /* The 'local' option means use the SCAN command over the network
1420 * socket (ie common file storage in use) */
1421 /*XXX we could accept this also as a local option? */
1422 if (strcmpic(scanner_options, US"local") == 0)
1424 use_scan_command = TRUE;
1428 cd = (clamd_address *) store_get(sizeof(clamd_address));
1430 /* extract host and port part */
1431 sublist = scanner_options;
1432 if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0)))
1434 (void) m_errlog_defer(scanent, NULL,
1435 string_sprintf("missing address: '%s'", scanner_options));
1438 if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0)))
1440 (void) m_errlog_defer(scanent, NULL,
1441 string_sprintf("missing port: '%s'", scanner_options));
1444 cd->tcp_port = atoi(CS s);
1447 /*XXX should these options be common over scanner types? */
1448 if (clamd_option(cd, sublist, &subsep) != OK)
1449 return m_errlog_defer(scanent, NULL,
1450 string_sprintf("bad option '%s'", scanner_options));
1452 cv[num_servers++] = cd;
1453 if (num_servers >= MAX_CLAMD_SERVERS)
1455 (void) m_errlog_defer(scanent, NULL,
1456 US"More than " MAX_CLAMD_SERVERS_S " clamd servers "
1457 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1460 } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep,
1463 /* check if we have at least one server */
1465 return m_errlog_defer(scanent, NULL,
1466 US"no useable server addresses in malware configuration option.");
1469 /* See the discussion of response formats below to see why we really
1470 don't like colons in filenames when passing filenames to ClamAV. */
1471 if (use_scan_command && Ustrchr(eml_filename, ':'))
1472 return m_errlog_defer(scanent, NULL,
1473 string_sprintf("local/SCAN mode incompatible with" \
1474 " : in path to email filename [%s]", eml_filename));
1476 /* Set up the very first data we will be sending */
1477 if (!use_scan_command)
1478 { cmd_str.data = US"zINSTREAM"; cmd_str.len = 10; }
1481 cmd_str.data = string_sprintf("SCAN %s\n", eml_filename);
1482 cmd_str.len = Ustrlen(cmd_str.data);
1485 /* We have some network servers specified */
1488 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1489 * only supports AF_INET, but we should probably be looking to the
1490 * future and rewriting this to be protocol-independent anyway. */
1492 while (num_servers > 0)
1494 int i = random_number(num_servers);
1495 clamd_address * cd = cv[i];
1497 DEBUG(D_acl) debug_printf_indent("trying server name %s, port %u\n",
1498 cd->hostspec, cd->tcp_port);
1500 /* Lookup the host. This is to ensure that we connect to the same IP
1501 * on both connections (as one host could resolve to multiple ips) */
1504 if ((sock = m_tcpsocket(cd->hostspec, cd->tcp_port,
1505 &connhost, &errstr, &cmd_str)) >= 0)
1507 /* Connection successfully established with a server */
1508 hostname = cd->hostspec;
1512 if (cd->retry <= 0) break;
1513 while (cd->retry > 0) cd->retry = sleep(cd->retry);
1518 (void) m_errlog_defer(scanent, CUS callout_address, errstr);
1520 /* Remove the server from the list. XXX We should free the memory */
1522 for (; i < num_servers; i++)
1526 if (num_servers == 0)
1527 return m_errlog_defer(scanent, NULL, US"all servers failed");
1532 if ((sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0)
1534 hostname = cv[0]->hostspec;
1537 if (cv[0]->retry <= 0)
1538 return m_errlog_defer(scanent, CUS callout_address, errstr);
1539 while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry);
1542 /* have socket in variable "sock"; command to use is semi-independent of
1543 * the socket protocol. We use SCAN if is local (either Unix/local
1544 * domain socket, or explicitly told local) else we stream the data.
1545 * How we stream the data depends upon how we were built. */
1547 if (!use_scan_command)
1549 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1550 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1553 DEBUG(D_acl) debug_printf_indent(
1554 "Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1557 /* Pass the string to ClamAV (10 = "zINSTREAM\0"), if not already sent */
1559 if (send(sock, cmd_str.data, cmd_str.len, 0) < 0)
1560 return m_errlog_defer_3(scanent, CUS hostname,
1561 string_sprintf("unable to send zINSTREAM to socket (%s)",
1565 /* calc file size */
1566 if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0)
1569 return m_errlog_defer_3(scanent, NULL,
1570 string_sprintf("can't open spool file %s: %s",
1571 eml_filename, strerror(err)),
1574 if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0)
1577 b_seek: err = errno;
1578 (void)close(clam_fd);
1579 return m_errlog_defer_3(scanent, NULL,
1580 string_sprintf("can't seek spool file %s: %s",
1581 eml_filename, strerror(err)),
1584 fsize_uint = (unsigned int) fsize;
1585 if ((off_t)fsize_uint != fsize)
1587 (void)close(clam_fd);
1588 return m_errlog_defer_3(scanent, NULL,
1589 string_sprintf("seeking spool file %s, size overflow",
1593 if (lseek(clam_fd, 0, SEEK_SET) < 0)
1596 if (!(clamav_fbuf = US malloc(fsize_uint)))
1598 (void)close(clam_fd);
1599 return m_errlog_defer_3(scanent, NULL,
1600 string_sprintf("unable to allocate memory %u for file (%s)",
1601 fsize_uint, eml_filename),
1605 if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0)
1608 free(clamav_fbuf); (void)close(clam_fd);
1609 return m_errlog_defer_3(scanent, NULL,
1610 string_sprintf("can't read spool file %s: %s",
1611 eml_filename, strerror(err)),
1614 (void)close(clam_fd);
1616 /* send file body to socket */
1617 send_size = htonl(fsize_uint);
1618 send_final_zeroblock = 0;
1619 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1620 (send(sock, clamav_fbuf, fsize_uint, 0) < 0) ||
1621 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1624 return m_errlog_defer_3(scanent, NULL,
1625 string_sprintf("unable to send file body to socket (%s)", hostname),
1632 { /* use scan command */
1633 /* Send a SCAN command pointing to a filename; then in the then in the
1634 * scan-method-neutral part, read the response back */
1636 /* ================================================================= */
1638 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1639 which dates to when ClamAV needed us to break apart the email into the
1640 MIME parts (eg, with the now deprecated demime condition coming first).
1641 Some time back, ClamAV gained the ability to deconstruct the emails, so
1642 doing this would actually have resulted in the mail attachments being
1643 scanned twice, in the broken out files and from the original .eml.
1644 Since ClamAV now handles emails (and has for quite some time) we can
1645 just use the email file itself. */
1646 /* Pass the string to ClamAV (7 = "SCAN \n" + \0), if not already sent */
1648 DEBUG(D_acl) debug_printf_indent(
1649 "Malware scan: issuing %s local-path scan [%s]\n",
1650 scanner_name, scanner_options);
1653 if (send(sock, cmd_str.data, cmd_str.len, 0) < 0)
1654 return m_errlog_defer_3(scanent, CUS callout_address,
1655 string_sprintf("unable to write to socket (%s)", strerror(errno)),
1658 /* Do not shut down the socket for writing; a user report noted that
1659 * clamd 0.70 does not react well to this. */
1661 /* Commands have been sent, no matter which scan method or connection
1662 * type we're using; now just read the result, independent of method. */
1664 /* Read the result */
1665 memset(av_buffer, 0, sizeof(av_buffer));
1666 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL));
1671 return m_errlog_defer(scanent, CUS callout_address,
1672 string_sprintf("unable to read from socket (%s)",
1673 errno == 0 ? "EOF" : strerror(errno)));
1675 if (bread == sizeof(av_buffer))
1676 return m_errlog_defer(scanent, CUS callout_address,
1677 US"buffer too small");
1678 /* We're now assured of a NULL at the end of av_buffer */
1680 /* Check the result. ClamAV returns one of two result formats.
1681 In the basic mode, the response is of the form:
1682 infected: -> "<filename>: <virusname> FOUND"
1683 not-infected: -> "<filename>: OK"
1684 error: -> "<filename>: <errcode> ERROR
1685 If the ExtendedDetectionInfo option has been turned on, then we get:
1686 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1687 for the infected case. Compare:
1688 /tmp/eicar.com: Eicar-Test-Signature FOUND
1689 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1691 In the streaming case, clamd uses the filename "stream" which you should
1692 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1693 client app will replace "stream" with the original filename before returning
1694 results to stdout, but the trace shows the data).
1696 We will assume that the pathname passed to clamd from Exim does not contain
1697 a colon. We will have whined loudly above if the eml_filename does (and we're
1698 passing a filename to clamd). */
1701 return m_errlog_defer(scanent, CUS callout_address,
1702 US"ClamAV returned null");
1704 /* strip newline at the end (won't be present for zINSTREAM)
1705 (also any trailing whitespace, which shouldn't exist, but we depend upon
1706 this below, so double-check) */
1707 p = av_buffer + Ustrlen(av_buffer) - 1;
1708 if (*p == '\n') *p = '\0';
1710 DEBUG(D_acl) debug_printf_indent("Malware response: %s\n", av_buffer);
1712 while (isspace(*--p) && (p > av_buffer))
1716 /* colon in returned output? */
1717 if(!(p = Ustrchr(av_buffer,':')))
1718 return m_errlog_defer(scanent, CUS callout_address, string_sprintf(
1719 "ClamAV returned malformed result (missing colon): %s",
1722 /* strip filename */
1723 while (*p && isspace(*++p)) /**/;
1726 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1727 but we should at least be resistant to it. */
1728 p = Ustrrchr(vname, ' ');
1729 result_tag = p ? p+1 : vname;
1731 if (Ustrcmp(result_tag, "FOUND") == 0)
1733 /* p should still be the whitespace before the result_tag */
1734 while (isspace(*p)) --p;
1736 /* Strip off the extended information too, which will be in parens
1737 after the virus name, with no intervening whitespace. */
1740 /* "(hash:size)", so previous '(' will do; if not found, we have
1741 a curious virus name, but not an error. */
1742 p = Ustrrchr(vname, '(');
1746 malware_name = string_copy(vname);
1747 DEBUG(D_acl) debug_printf_indent("Malware found, name \"%s\"\n", malware_name);
1750 else if (Ustrcmp(result_tag, "ERROR") == 0)
1751 return m_errlog_defer(scanent, CUS callout_address,
1752 string_sprintf("ClamAV returned: %s", av_buffer));
1754 else if (Ustrcmp(result_tag, "OK") == 0)
1756 /* Everything should be OK */
1757 malware_name = NULL;
1758 DEBUG(D_acl) debug_printf_indent("Malware not found\n");
1762 return m_errlog_defer(scanent, CUS callout_address,
1763 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1769 #ifndef DISABLE_MAL_SOCK
1770 case M_SOCK: /* "sock" scanner type ------------------------------------- */
1771 /* This code was derived by Martin Poole from the clamd code contributed
1772 by David Saez and the cmdline code
1776 uschar * commandline;
1777 uschar av_buffer[1024];
1778 uschar * linebuffer;
1779 uschar * sockline_scanner;
1780 uschar sockline_scanner_default[] = "%s\n";
1781 const pcre *sockline_trig_re;
1782 const pcre *sockline_name_re;
1784 /* find scanner command line */
1785 if ( (sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
1787 && *sockline_scanner
1789 { /* check for no expansions apart from one %s */
1790 uschar * s = Ustrchr(sockline_scanner, '%');
1792 if ((*s != 's' && *s != '%') || Ustrchr(s+1, '%'))
1793 return m_errlog_defer_3(scanent, NULL,
1794 US"unsafe sock scanner call spec", sock);
1797 sockline_scanner = sockline_scanner_default;
1798 DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "cmdline: ",
1799 string_printing(sockline_scanner));
1801 /* find scanner output trigger */
1802 sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1803 "missing trigger specification", &errstr);
1804 if (!sockline_trig_re)
1805 return m_errlog_defer_3(scanent, NULL, errstr, sock);
1807 /* find virus name regex */
1808 sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1809 "missing virus name regex specification", &errstr);
1810 if (!sockline_name_re)
1811 return m_errlog_defer_3(scanent, NULL, errstr, sock);
1813 /* prepare scanner call - security depends on expansions check above */
1814 commandline = string_sprintf( CS sockline_scanner, CS eml_filename);
1815 DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "expanded: ",
1816 string_printing(commandline));
1818 /* Pass the command string to the socket */
1819 if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
1820 return m_errlog_defer(scanent, CUS callout_address, errstr);
1822 /* Read the result */
1823 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL));
1826 return m_errlog_defer_3(scanent, CUS callout_address,
1827 string_sprintf("unable to read from socket (%s)", strerror(errno)),
1830 if (bread == sizeof(av_buffer))
1831 return m_errlog_defer_3(scanent, CUS callout_address,
1832 US"buffer too small", sock);
1833 av_buffer[bread] = '\0';
1834 linebuffer = string_copy(av_buffer);
1835 DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "answer: ",
1836 string_printing(linebuffer));
1838 /* try trigger match */
1839 if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1))
1841 if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
1842 malware_name = US "unknown";
1843 DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "name: ",
1844 string_printing(malware_name));
1846 else /* no virus found */
1847 malware_name = NULL;
1852 #ifndef DISABLE_MAL_MKS
1853 case M_MKSD: /* "mksd" scanner type ------------------------------------- */
1855 char *mksd_options_end;
1856 int mksd_maxproc = 1; /* default, if no option supplied */
1859 if (scanner_options)
1861 mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
1862 if ( *scanner_options == '\0'
1863 || *mksd_options_end != '\0'
1865 || mksd_maxproc > 32
1867 return m_errlog_defer(scanent, CUS callout_address,
1868 string_sprintf("invalid option '%s'", scanner_options));
1871 if((sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
1872 return m_errlog_defer(scanent, CUS callout_address, errstr);
1874 malware_name = NULL;
1876 DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan\n", scanner_name);
1878 if ((retval = mksd_scan_packed(scanent, sock, eml_filename, tmo)) != OK)
1887 #ifndef DISABLE_MAL_AVAST
1888 case M_AVAST: /* "avast" scanner type ----------------------------------- */
1892 uschar * scanrequest;
1893 enum {AVA_HELO, AVA_OPT, AVA_RSP, AVA_DONE} avast_stage;
1896 /* According to Martin Tuma @avast the protocol uses "escaped
1897 whitespace", that is, every embedded whitespace is backslash
1898 escaped, as well as backslash is protected by backslash.
1899 The returned lines contain the name of the scanned file, a tab
1903 [E] - some error occured
1904 Such marker follows the first non-escaped TAB. */
1905 if ( ( !ava_re_clean
1906 && !(ava_re_clean = m_pcre_compile(ava_re_clean_str, &errstr)))
1908 && !(ava_re_virus = m_pcre_compile(ava_re_virus_str, &errstr)))
1910 return malware_errlog_defer(errstr);
1912 /* wait for result */
1913 for (avast_stage = AVA_HELO;
1914 (nread = recv_line(sock, buf, sizeof(buf), tmo)) > 0;
1917 int slen = Ustrlen(buf);
1920 DEBUG(D_acl) debug_printf_indent("got from avast: %s\n", buf);
1921 switch (avast_stage)
1924 if (Ustrncmp(buf, "220", 3) != 0)
1925 goto endloop; /* require a 220 */
1929 if (Ustrncmp(buf, "210", 3) == 0)
1930 break; /* ignore 210 responses */
1931 if (Ustrncmp(buf, "200", 3) != 0)
1932 goto endloop; /* require a 200 */
1937 /* Check for another option to send. Newline-terminate it. */
1938 if ((scanrequest = string_nextinlist(&av_scanner_work, &sep,
1941 scanrequest = string_sprintf("%s\n", scanrequest);
1942 avast_stage = AVA_OPT; /* just sent option */
1946 scanrequest = string_sprintf("SCAN %s\n", eml_dir);
1947 avast_stage = AVA_RSP; /* just sent command */
1950 /* send config-cmd or scan-request to socket */
1951 len = Ustrlen(scanrequest);
1952 if (send(sock, scanrequest, len, 0) < 0)
1954 scanrequest[len-1] = '\0';
1955 return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf(
1956 "unable to send request '%s' to socket (%s): %s",
1957 scanrequest, scanner_options, strerror(errno)), sock);
1963 if (Ustrncmp(buf, "210", 3) == 0)
1964 break; /* ignore the "210 SCAN DATA" message */
1966 if (pcre_exec(ava_re_clean, NULL, CS buf, slen,
1967 0, 0, ovector, nelem(ovector)) > 0)
1970 if ((malware_name = m_pcre_exec(ava_re_virus, buf)))
1971 { /* remove backslash in front of [whitespace|backslash] */
1973 for (p = malware_name; *p; ++p)
1974 if (*p == '\\' && (isspace(p[1]) || p[1] == '\\'))
1975 for (p0 = p; *p0; ++p0) *p0 = p0[1];
1977 avast_stage = AVA_DONE;
1981 if (Ustrncmp(buf, "200 SCAN OK", 11) == 0)
1982 { /* we're done finally */
1983 if (send(sock, "QUIT\n", 5, 0) < 0) /* courtesy */
1984 return m_errlog_defer_3(scanent, CUS callout_address,
1986 "unable to send quit request to socket (%s): %s",
1987 scanner_options, strerror(errno)),
1989 malware_name = NULL;
1990 avast_stage = AVA_DONE;
1994 /* here for any unexpected response from the scanner */
1997 case AVA_DONE: log_write(0, LOG_PANIC, "%s:%d:%s: should not happen",
1998 __FILE__, __LINE__, __FUNCTION__);
2008 case AVA_RSP: return m_errlog_defer_3(scanent, CUS callout_address,
2011 "invalid response from scanner: '%s'", buf)
2013 ? US"EOF from scanner"
2014 : US"timeout from scanner",
2021 } /* scanner type switch */
2024 (void) close (sock);
2025 malware_ok = TRUE; /* set "been here, done that" marker */
2028 /* match virus name against pattern (caseless ------->----------v) */
2029 if (malware_name && regex_match_and_setup(re, malware_name, 0, -1))
2031 DEBUG(D_acl) debug_printf_indent(
2032 "Matched regex to malware [%s] [%s]\n", malware_re, malware_name);
2040 /*************************************************
2041 * Scan an email for malware *
2042 *************************************************/
2044 /* This is the normal interface for scanning an email, which doesn't need a
2045 filename; it's a wrapper around the malware_file function.
2048 malware_re match condition for "malware="
2049 timeout if nonzero, timeout in seconds
2051 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
2052 where true means malware was found (condition applies)
2055 malware(const uschar * malware_re, int timeout)
2057 int ret = malware_internal(malware_re, NULL, timeout);
2059 if (ret == DEFER) av_failed = TRUE;
2064 /*************************************************
2065 * Scan a file for malware *
2066 *************************************************/
2068 /* This is a test wrapper for scanning an email, which is not used in
2069 normal processing. Scan any file, using the Exim scanning interface.
2070 This function tampers with various global variables so is unsafe to use
2071 in any other context.
2074 eml_filename a file holding the message to be scanned
2076 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
2077 where true means malware was found (condition applies)
2080 malware_in_file(uschar *eml_filename)
2082 uschar message_id_buf[64];
2085 /* spool_mbox() assumes various parameters exist, when creating
2086 the relevant directory and the email within */
2088 (void) string_format(message_id_buf, sizeof(message_id_buf),
2089 "dummy-%d", vaguely_random_number(INT_MAX));
2090 message_id = message_id_buf;
2091 sender_address = US"malware-sender@example.net";
2093 recipients_list = NULL;
2094 receive_add_recipient(US"malware-victim@example.net", -1);
2095 enable_dollar_recipients = TRUE;
2097 ret = malware_internal(US"*", eml_filename, 0);
2099 Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id));
2102 /* don't set no_mbox_unspool; at present, there's no way for it to become
2103 set, but if that changes, then it should apply to these tests too */
2107 /* silence static analysis tools */
2117 if (!malware_default_re)
2118 malware_default_re = regex_must_compile(malware_regex_default, FALSE, TRUE);
2120 #ifndef DISABLE_MAL_DRWEB
2122 drweb_re = regex_must_compile(drweb_re_str, FALSE, TRUE);
2124 #ifndef DISABLE_MAL_FSECURE
2126 fsec_re = regex_must_compile(fsec_re_str, FALSE, TRUE);
2128 #ifndef DISABLE_MAL_KAV
2130 kav_re_sus = regex_must_compile(kav_re_sus_str, FALSE, TRUE);
2132 kav_re_inf = regex_must_compile(kav_re_inf_str, FALSE, TRUE);
2134 #ifndef DISABLE_MAL_AVA
2136 ava_re_clean = regex_must_compile(ava_re_clean_str, FALSE, TRUE);
2138 ava_re_virus = regex_must_compile(ava_re_virus_str, FALSE, TRUE);
2140 #ifndef DISABLE_MAL_FPROT6D
2141 if (!fprot6d_re_error)
2142 fprot6d_re_error = regex_must_compile(fprot6d_re_error_str, FALSE, TRUE);
2143 if (!fprot6d_re_virus)
2144 fprot6d_re_virus = regex_must_compile(fprot6d_re_virus_str, FALSE, TRUE);
2150 malware_show_supported(FILE * f)
2153 fprintf(f, "Malware:");
2154 for (sc = m_scans; sc->scancode != -1; sc++) fprintf(f, " %s", sc->name);
2159 # endif /*!MACRO_PREDEF*/
2160 #endif /*WITH_CONTENT_SCAN*/