Commit | Line | Data |
---|---|---|
8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 JH |
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 |
6 | * License: GPL | |
c11d665d | 7 | * Copyright (c) The Exim Maintainers 2017 - 2018 |
80fea873 | 8 | */ |
8523533c TK |
9 | |
10 | /* Code for calling virus (malware) scanners. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
c11d665d | 13 | #ifdef WITH_CONTENT_SCAN /* entire file */ |
8523533c | 14 | |
b1f8e4f8 | 15 | typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL, |
71b32d41 | 16 | M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD, M_AVAST, M_FPROT6D} scanner_t; |
b1f8e4f8 JH |
17 | typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t; |
18 | static struct scan | |
19 | { | |
20 | scanner_t scancode; | |
21 | const uschar * name; | |
22 | const uschar * options_default; | |
23 | contype_t conn; | |
24 | } m_scans[] = | |
25 | { | |
c11d665d | 26 | #ifndef DISABLE_MAL_FFROTD |
b1f8e4f8 | 27 | { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP }, |
c11d665d JH |
28 | #endif |
29 | #ifndef DISABLE_MAL_FFROT6D | |
30 | { M_FPROT6D, US"f-prot6d", US"localhost 10200", MC_TCP }, | |
31 | #endif | |
32 | #ifndef DISABLE_MAL_DRWEB | |
b1f8e4f8 | 33 | { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM }, |
c11d665d JH |
34 | #endif |
35 | #ifndef DISABLE_MAL_AVE | |
b1f8e4f8 | 36 | { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX }, |
c11d665d JH |
37 | #endif |
38 | #ifndef DISABLE_MAL_FSECURE | |
b1f8e4f8 | 39 | { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX }, |
c11d665d JH |
40 | #endif |
41 | #ifndef DISABLE_MAL_KAV | |
b1f8e4f8 | 42 | { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX }, |
c11d665d JH |
43 | #endif |
44 | #ifndef DISABLE_MAL_SOPHIE | |
b1f8e4f8 | 45 | { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX }, |
c11d665d JH |
46 | #endif |
47 | #ifndef DISABLE_MAL_CLAM | |
b1f8e4f8 | 48 | { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE }, |
c11d665d JH |
49 | #endif |
50 | #ifndef DISABLE_MAL_MKS | |
b1f8e4f8 | 51 | { M_MKSD, US"mksd", NULL, MC_NONE }, |
c11d665d JH |
52 | #endif |
53 | #ifndef DISABLE_MAL_AVAST | |
b6fbf22d | 54 | { M_AVAST, US"avast", US"/var/run/avast/scan.sock", MC_STRM }, |
c11d665d JH |
55 | #endif |
56 | #ifndef DISABLE_MAL_SOCK | |
57 | { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM }, | |
58 | #endif | |
59 | #ifndef DISABLE_MAL_CMDLINE | |
60 | { M_CMDL, US"cmdline", NULL, MC_NONE }, | |
61 | #endif | |
b1f8e4f8 JH |
62 | { -1, NULL, NULL, MC_NONE } /* end-marker */ |
63 | }; | |
64 | ||
c11d665d JH |
65 | /******************************************************************************/ |
66 | # ifdef MACRO_PREDEF /* build solely to predefine macros */ | |
67 | ||
68 | # include "macro_predef.h" | |
69 | ||
70 | void | |
71 | features_malware(void) | |
72 | { | |
73 | struct scan * sc; | |
74 | uschar * s, * t; | |
75 | uschar buf[64]; | |
76 | ||
77 | spf(buf, sizeof(buf), US"_HAVE_MALWARE_"); | |
78 | ||
79 | for (sc = m_scans; sc->scancode != -1; sc++) | |
80 | { | |
81 | for(s = sc->name, t = buf+14; *s; s++) if (*s != '-') *t++ = toupper(*s); | |
82 | *t = '\0'; | |
83 | builtin_macro_create(buf); | |
84 | } | |
85 | } | |
86 | ||
87 | /******************************************************************************/ | |
88 | # else /*!MACRO_PREDEF, main build*/ | |
89 | ||
90 | ||
91 | #define MALWARE_TIMEOUT 120 /* default timeout, seconds */ | |
92 | ||
93 | static const uschar * malware_regex_default = US ".+"; | |
94 | static const pcre * malware_default_re = NULL; | |
95 | ||
96 | ||
97 | ||
98 | #ifndef DISABLE_MAL_CLAM | |
599dcb77 | 99 | /* The maximum number of clamd servers that are supported in the configuration */ |
c11d665d JH |
100 | # define MAX_CLAMD_SERVERS 32 |
101 | # define MAX_CLAMD_SERVERS_S "32" | |
599dcb77 | 102 | |
8a512ed5 JH |
103 | typedef struct clamd_address { |
104 | uschar * hostspec; | |
105 | unsigned tcp_port; | |
106 | unsigned retry; | |
107 | } clamd_address; | |
8523533c TK |
108 | #endif |
109 | ||
a9ccd69a | 110 | |
c11d665d JH |
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" */ | |
8523533c | 115 | |
c11d665d JH |
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 */ | |
476be7e2 JH |
120 | |
121 | static const uschar * drweb_re_str = US "infected\\swith\\s*(.+?)$"; | |
122 | static const pcre * drweb_re = NULL; | |
c11d665d | 123 | #endif |
476be7e2 | 124 | |
c11d665d | 125 | #ifndef DISABLE_MAL_FSECURE |
476be7e2 JH |
126 | static const uschar * fsec_re_str = US "\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$"; |
127 | static const pcre * fsec_re = NULL; | |
c11d665d | 128 | #endif |
476be7e2 | 129 | |
c11d665d | 130 | #ifndef DISABLE_MAL_KAV |
476be7e2 JH |
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; | |
c11d665d | 135 | #endif |
476be7e2 | 136 | |
c11d665d | 137 | #ifndef DISABLE_MAL_AVAST |
476be7e2 JH |
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; | |
c11d665d | 142 | #endif |
476be7e2 | 143 | |
c11d665d | 144 | #ifndef DISABLE_MAL_FFROT6D |
71b32d41 ACK |
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; | |
c11d665d | 149 | #endif |
71b32d41 | 150 | |
476be7e2 JH |
151 | |
152 | ||
153 | /******************************************************************************/ | |
154 | ||
b1f8e4f8 | 155 | /* Routine to check whether a system is big- or little-endian. |
8523533c TK |
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 | |
b1f8e4f8 JH |
160 | static int test_byte_order(void); |
161 | static inline int | |
162 | test_byte_order() | |
163 | { | |
164 | short int word = 0x0001; | |
5903c6ff | 165 | char *byte = CS &word; |
b1f8e4f8 | 166 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); |
8523533c TK |
167 | } |
168 | ||
b1f8e4f8 | 169 | BOOL malware_ok = FALSE; |
8523533c | 170 | |
8544e77a PP |
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; | |
55240832 | 175 | extern uschar spooled_message_id[MESSAGE_ID_LENGTH+1]; |
8544e77a | 176 | |
8544e77a PP |
177 | |
178 | ||
b1f8e4f8 JH |
179 | static inline int |
180 | malware_errlog_defer(const uschar * str) | |
181 | { | |
8a512ed5 JH |
182 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str); |
183 | return DEFER; | |
b1f8e4f8 JH |
184 | } |
185 | ||
186 | static int | |
0ea02355 JH |
187 | m_errlog_defer(struct scan * scanent, const uschar * hostport, |
188 | const uschar * str) | |
b1f8e4f8 | 189 | { |
0ea02355 JH |
190 | return malware_errlog_defer(string_sprintf("%s %s : %s", |
191 | scanent->name, hostport ? hostport : CUS"", str)); | |
b1f8e4f8 JH |
192 | } |
193 | static int | |
0ea02355 JH |
194 | m_errlog_defer_3(struct scan * scanent, const uschar * hostport, |
195 | const uschar * str, int fd_to_close) | |
b1f8e4f8 | 196 | { |
8a512ed5 | 197 | (void) close(fd_to_close); |
0ea02355 | 198 | return m_errlog_defer(scanent, hostport, str); |
b1f8e4f8 JH |
199 | } |
200 | ||
201 | /*************************************************/ | |
202 | ||
c11d665d | 203 | #ifndef DISABLE_MAL_CLAM |
b1f8e4f8 JH |
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. | |
206 | */ | |
207 | static inline int | |
208 | m_tcpsocket(const uschar * hostname, unsigned int port, | |
10ac8d7f | 209 | host_item * host, uschar ** errstr, const blob * fastopen_blob) |
b1f8e4f8 | 210 | { |
4a5cbaff | 211 | return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, |
10ac8d7f | 212 | host, errstr, fastopen_blob); |
b1f8e4f8 | 213 | } |
c11d665d | 214 | #endif |
b1f8e4f8 | 215 | |
b1f8e4f8 JH |
216 | static int |
217 | m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr) | |
218 | { | |
8a512ed5 JH |
219 | if (send(sock, buf, cnt, 0) < 0) |
220 | { | |
221 | int err = errno; | |
222 | (void)close(sock); | |
223 | *errstr = string_sprintf("unable to send to socket (%s): %s", | |
224 | buf, strerror(err)); | |
225 | return -1; | |
226 | } | |
227 | return sock; | |
b1f8e4f8 JH |
228 | } |
229 | ||
230 | static const pcre * | |
231 | m_pcre_compile(const uschar * re, uschar ** errstr) | |
232 | { | |
8a512ed5 JH |
233 | const uschar * rerror; |
234 | int roffset; | |
235 | const pcre * cre; | |
236 | ||
237 | cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
238 | if (!cre) | |
239 | *errstr= string_sprintf("regular expression error in '%s': %s at offset %d", | |
240 | re, rerror, roffset); | |
241 | return cre; | |
b1f8e4f8 JH |
242 | } |
243 | ||
244 | uschar * | |
245 | m_pcre_exec(const pcre * cre, uschar * text) | |
246 | { | |
8a512ed5 JH |
247 | int ovector[10*3]; |
248 | int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0, | |
c11d665d | 249 | ovector, nelem(ovector)); |
8a512ed5 JH |
250 | uschar * substr = NULL; |
251 | if (i >= 2) /* Got it */ | |
252 | pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr); | |
253 | return substr; | |
b1f8e4f8 JH |
254 | } |
255 | ||
256 | static const pcre * | |
55414b25 JH |
257 | m_pcre_nextinlist(const uschar ** list, int * sep, |
258 | char * listerr, uschar ** errstr) | |
b1f8e4f8 | 259 | { |
8a512ed5 JH |
260 | const uschar * list_ele; |
261 | const pcre * cre = NULL; | |
262 | ||
263 | if (!(list_ele = string_nextinlist(list, sep, NULL, 0))) | |
264 | *errstr = US listerr; | |
265 | else | |
ac4d558b JH |
266 | { |
267 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "RE: ", | |
268 | string_printing(list_ele)); | |
8a512ed5 | 269 | cre = m_pcre_compile(CUS list_ele, errstr); |
ac4d558b | 270 | } |
8a512ed5 | 271 | return cre; |
b1f8e4f8 JH |
272 | } |
273 | ||
4e71661f JH |
274 | /* |
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. | |
278 | ||
0f0c8159 JH |
279 | Return: number of chars - zero for an empty line |
280 | -1 on EOF | |
281 | -2 on timeout or error | |
4e71661f JH |
282 | */ |
283 | static int | |
284 | recv_line(int fd, uschar * buffer, int bsize, int tmo) | |
285 | { | |
286 | uschar * p = buffer; | |
287 | ssize_t rcv; | |
0f0c8159 | 288 | BOOL ok = FALSE; |
4e71661f JH |
289 | |
290 | if (!fd_ready(fd, tmo-time(NULL))) | |
0f0c8159 | 291 | return -2; |
4e71661f | 292 | |
0f0c8159 | 293 | /*XXX tmo handling assumes we always get a whole line */ |
4e71661f | 294 | /* read until \n */ |
0f0c8159 | 295 | errno = 0; |
4e71661f JH |
296 | while ((rcv = read(fd, p, 1)) > 0) |
297 | { | |
0f0c8159 | 298 | ok = TRUE; |
4e71661f JH |
299 | if (p-buffer > bsize-2) break; |
300 | if (*p == '\n') break; | |
301 | if (*p != '\r') p++; | |
302 | } | |
0f0c8159 JH |
303 | if (!ok) |
304 | { | |
e1d04f48 | 305 | DEBUG(D_acl) debug_printf_indent("Malware scan: read %s (%s)\n", |
0f0c8159 JH |
306 | rcv==0 ? "EOF" : "error", strerror(errno)); |
307 | return rcv==0 ? -1 : -2; | |
308 | } | |
4e71661f JH |
309 | *p = '\0'; |
310 | ||
e1d04f48 | 311 | DEBUG(D_acl) debug_printf_indent("Malware scan: read '%s'\n", buffer); |
4e71661f JH |
312 | return p - buffer; |
313 | } | |
314 | ||
315 | /* return TRUE iff size as requested */ | |
316 | static BOOL | |
317 | recv_len(int sock, void * buf, int size, int tmo) | |
318 | { | |
319 | return fd_ready(sock, tmo-time(NULL)) | |
320 | ? recv(sock, buf, size, 0) == size | |
321 | : FALSE; | |
322 | } | |
323 | ||
324 | ||
0f0c8159 | 325 | |
c11d665d | 326 | #ifndef DISABLE_MAL_MKS |
0f0c8159 JH |
327 | /* ============= private routines for the "mksd" scanner type ============== */ |
328 | ||
c11d665d | 329 | # include <sys/uio.h> |
0f0c8159 JH |
330 | |
331 | static inline int | |
332 | mksd_writev (int sock, struct iovec * iov, int iovcnt) | |
333 | { | |
334 | int i; | |
335 | ||
336 | for (;;) | |
337 | { | |
338 | do | |
339 | i = writev (sock, iov, iovcnt); | |
340 | while (i < 0 && errno == EINTR); | |
341 | if (i <= 0) | |
342 | { | |
343 | (void) malware_errlog_defer( | |
344 | US"unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
345 | return -1; | |
346 | } | |
347 | for (;;) /* check for short write */ | |
348 | if (i >= iov->iov_len) | |
349 | { | |
350 | if (--iovcnt == 0) | |
351 | return 0; | |
352 | i -= iov->iov_len; | |
353 | iov++; | |
354 | } | |
355 | else | |
356 | { | |
357 | iov->iov_len -= i; | |
358 | iov->iov_base = CS iov->iov_base + i; | |
359 | break; | |
360 | } | |
361 | } | |
362 | } | |
363 | ||
364 | static inline int | |
365 | mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size, int tmo) | |
366 | { | |
367 | int offset = 0; | |
368 | int i; | |
369 | ||
370 | do | |
371 | { | |
372 | i = ip_recv(sock, av_buffer+offset, av_buffer_size-offset, tmo-time(NULL)); | |
373 | if (i <= 0) | |
374 | { | |
375 | (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
376 | return -1; | |
377 | } | |
378 | ||
379 | offset += i; | |
380 | /* offset == av_buffer_size -> buffer full */ | |
381 | if (offset == av_buffer_size) | |
382 | { | |
383 | (void) malware_errlog_defer(US"malformed reply received from mksd"); | |
384 | return -1; | |
385 | } | |
386 | } while (av_buffer[offset-1] != '\n'); | |
387 | ||
388 | av_buffer[offset] = '\0'; | |
389 | return offset; | |
390 | } | |
391 | ||
392 | static inline int | |
393 | mksd_parse_line(struct scan * scanent, char * line) | |
394 | { | |
395 | char *p; | |
396 | ||
397 | switch (*line) | |
398 | { | |
399 | case 'O': /* OK */ | |
400 | return OK; | |
401 | ||
402 | case 'E': | |
403 | case 'A': /* ERR */ | |
404 | if ((p = strchr (line, '\n')) != NULL) | |
405 | *p = '\0'; | |
0ea02355 | 406 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
407 | string_sprintf("scanner failed: %s", line)); |
408 | ||
409 | default: /* VIR */ | |
410 | if ((p = strchr (line, '\n')) != NULL) | |
411 | { | |
412 | *p = '\0'; | |
413 | if ( p-line > 5 | |
414 | && line[3] == ' ' | |
415 | && (p = strchr(line+4, ' ')) != NULL | |
416 | && p-line > 4 | |
417 | ) | |
418 | { | |
419 | *p = '\0'; | |
420 | malware_name = string_copy(US line+4); | |
421 | return OK; | |
422 | } | |
423 | } | |
0ea02355 | 424 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
425 | string_sprintf("malformed reply received: %s", line)); |
426 | } | |
427 | } | |
428 | ||
429 | static int | |
430 | mksd_scan_packed(struct scan * scanent, int sock, const uschar * scan_filename, | |
431 | int tmo) | |
432 | { | |
433 | struct iovec iov[3]; | |
434 | const char *cmd = "MSQ\n"; | |
435 | uschar av_buffer[1024]; | |
436 | ||
437 | iov[0].iov_base = (void *) cmd; | |
438 | iov[0].iov_len = 3; | |
439 | iov[1].iov_base = (void *) scan_filename; | |
440 | iov[1].iov_len = Ustrlen(scan_filename); | |
441 | iov[2].iov_base = (void *) (cmd + 3); | |
442 | iov[2].iov_len = 1; | |
443 | ||
444 | if (mksd_writev (sock, iov, 3) < 0) | |
445 | return DEFER; | |
446 | ||
447 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer), tmo) < 0) | |
448 | return DEFER; | |
449 | ||
450 | return mksd_parse_line (scanent, CS av_buffer); | |
451 | } | |
c11d665d | 452 | #endif /* MKSD */ |
0f0c8159 | 453 | |
8a512ed5 | 454 | |
c11d665d | 455 | #ifndef DISABLE_MAL_CLAM |
8a512ed5 JH |
456 | static int |
457 | clamd_option(clamd_address * cd, const uschar * optstr, int * subsep) | |
458 | { | |
459 | uschar * s; | |
460 | ||
461 | cd->retry = 0; | |
462 | while ((s = string_nextinlist(&optstr, subsep, NULL, 0))) | |
8a512ed5 JH |
463 | if (Ustrncmp(s, "retry=", 6) == 0) |
464 | { | |
465 | int sec = readconf_readtime((s += 6), '\0', FALSE); | |
466 | if (sec < 0) | |
467 | return FAIL; | |
468 | cd->retry = sec; | |
469 | } | |
470 | else | |
471 | return FAIL; | |
93a6fce2 | 472 | return OK; |
8a512ed5 | 473 | } |
c11d665d JH |
474 | #endif |
475 | ||
476 | ||
8a512ed5 | 477 | |
8544e77a PP |
478 | /************************************************* |
479 | * Scan content for malware * | |
480 | *************************************************/ | |
481 | ||
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. | |
484 | ||
485 | Arguments: | |
0f0c8159 | 486 | malware_re match condition for "malware=" |
040721f2 JH |
487 | scan_filename the file holding the email to be scanned, if we're faking |
488 | this up for the -bmalware test, else NULL | |
0f0c8159 | 489 | timeout if nonzero, non-default timeoutl |
8544e77a PP |
490 | |
491 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
492 | where true means malware was found (condition applies) | |
493 | */ | |
b1f8e4f8 | 494 | static int |
040721f2 JH |
495 | malware_internal(const uschar * malware_re, const uschar * scan_filename, |
496 | int timeout) | |
b1f8e4f8 | 497 | { |
0f0c8159 | 498 | int sep = 0; |
55414b25 | 499 | const uschar *av_scanner_work = av_scanner; |
0f0c8159 | 500 | uschar *scanner_name; |
0f0c8159 JH |
501 | unsigned long mbox_size; |
502 | FILE *mbox_file; | |
503 | const pcre *re; | |
504 | uschar * errstr; | |
505 | struct scan * scanent; | |
506 | const uschar * scanner_options; | |
507 | int sock = -1; | |
508 | time_t tmo; | |
040721f2 | 509 | uschar * eml_filename, * eml_dir; |
0f0c8159 | 510 | |
040721f2 JH |
511 | if (!malware_re) |
512 | return FAIL; /* empty means "don't match anything" */ | |
513 | ||
514 | /* Ensure the eml mbox file is spooled up */ | |
515 | ||
516 | if (!(mbox_file = spool_mbox(&mbox_size, scan_filename, &eml_filename))) | |
0f0c8159 JH |
517 | return malware_errlog_defer(US"error while creating mbox spool file"); |
518 | ||
040721f2 JH |
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. */ | |
0f0c8159 | 521 | |
040721f2 JH |
522 | (void) fclose(mbox_file); |
523 | eml_dir = string_copyn(eml_filename, Ustrrchr(eml_filename, '/') - eml_filename); | |
0f0c8159 JH |
524 | |
525 | /* parse 1st option */ | |
040721f2 | 526 | if (strcmpic(malware_re, US"false") == 0 || Ustrcmp(malware_re,"0") == 0) |
0f0c8159 JH |
527 | return FAIL; /* explicitly no matching */ |
528 | ||
529 | /* special cases (match anything except empty) */ | |
476be7e2 JH |
530 | if ( strcmpic(malware_re,US"true") == 0 |
531 | || Ustrcmp(malware_re,"*") == 0 | |
532 | || Ustrcmp(malware_re,"1") == 0 | |
533 | ) | |
534 | { | |
535 | if ( !malware_default_re | |
536 | && !(malware_default_re = m_pcre_compile(malware_regex_default, &errstr))) | |
537 | return malware_errlog_defer(errstr); | |
0f0c8159 | 538 | malware_re = malware_regex_default; |
476be7e2 JH |
539 | re = malware_default_re; |
540 | } | |
0f0c8159 JH |
541 | |
542 | /* compile the regex, see if it works */ | |
476be7e2 | 543 | else if (!(re = m_pcre_compile(malware_re, &errstr))) |
0f0c8159 JH |
544 | return malware_errlog_defer(errstr); |
545 | ||
546 | /* if av_scanner starts with a dollar, expand it first */ | |
547 | if (*av_scanner == '$') | |
548 | { | |
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)); | |
b1f8e4f8 | 553 | |
0f0c8159 | 554 | DEBUG(D_acl) |
e1d04f48 | 555 | debug_printf_indent("Expanded av_scanner global: %s\n", av_scanner_work); |
0f0c8159 JH |
556 | /* disable result caching in this case */ |
557 | malware_name = NULL; | |
558 | malware_ok = FALSE; | |
8523533c TK |
559 | } |
560 | ||
0f0c8159 JH |
561 | /* Do not scan twice (unless av_scanner is dynamic). */ |
562 | if (!malware_ok) | |
563 | { | |
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; | |
569 | ||
3e60dd41 JH |
570 | for (scanent = m_scans; ; scanent++) |
571 | { | |
0f0c8159 JH |
572 | if (!scanent->name) |
573 | return malware_errlog_defer(string_sprintf("unknown scanner type '%s'", | |
574 | scanner_name)); | |
575 | if (strcmpic(scanner_name, US scanent->name) != 0) | |
576 | continue; | |
ac4d558b JH |
577 | DEBUG(D_acl) debug_printf_indent("Malware scan: %s tmo=%s\n", |
578 | scanner_name, readconf_printtime(timeout)); | |
579 | ||
0f0c8159 JH |
580 | if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) |
581 | scanner_options = scanent->options_default; | |
582 | if (scanent->conn == MC_NONE) | |
b1f8e4f8 | 583 | break; |
ac4d558b JH |
584 | |
585 | DEBUG(D_acl) debug_printf_indent("%15s%10s%s\n", "", "socket: ", scanner_options); | |
0f0c8159 JH |
586 | switch(scanent->conn) |
587 | { | |
8c0d5ae8 JH |
588 | case MC_TCP: sock = ip_tcpsocket(scanner_options, &errstr, 5); break; |
589 | case MC_UNIX: sock = ip_unixsocket(scanner_options, &errstr); break; | |
3e60dd41 | 590 | case MC_STRM: sock = ip_streamsocket(scanner_options, &errstr, 5); break; |
0f0c8159 | 591 | default: /* compiler quietening */ break; |
384152a6 | 592 | } |
0f0c8159 | 593 | if (sock < 0) |
0ea02355 | 594 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
595 | break; |
596 | } | |
8e669ac1 | 597 | |
0f0c8159 JH |
598 | switch (scanent->scancode) |
599 | { | |
c11d665d | 600 | #ifndef DISABLE_MAL_FFROTD |
0f0c8159 | 601 | case M_FPROTD: /* "f-protd" scanner type -------------------------------- */ |
b1f8e4f8 | 602 | { |
0f0c8159 JH |
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; | |
608 | int len; | |
b1f8e4f8 | 609 | |
0f0c8159 | 610 | scanrequest = string_sprintf("GET %s", eml_filename); |
b1f8e4f8 | 611 | |
0f0c8159 JH |
612 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, |
613 | NULL, 0))) | |
614 | { | |
615 | scanrequest = string_sprintf("%s%s%s", scanrequest, | |
616 | par_count ? "%20" : "?", fp_scan_option); | |
617 | par_count++; | |
618 | } | |
619 | scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest); | |
e1d04f48 | 620 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n", |
0f0c8159 | 621 | scanner_name, scanrequest); |
b1f8e4f8 | 622 | |
0f0c8159 JH |
623 | /* send scan request */ |
624 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
0ea02355 | 625 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 626 | |
0f0c8159 JH |
627 | while ((len = recv_line(sock, buf, sizeof(buf), tmo)) >= 0) |
628 | if (len > 0) | |
629 | { | |
630 | if (Ustrstr(buf, US"<detected type=\"") != NULL) | |
631 | detected = 1; | |
632 | else if (detected && (strhelper = Ustrstr(buf, US"<name>"))) | |
4e71661f | 633 | { |
0f0c8159 | 634 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) |
4e71661f | 635 | { |
0f0c8159 JH |
636 | *strhelper2 = '\0'; |
637 | malware_name_internal = string_copy(strhelper+6); | |
4e71661f JH |
638 | } |
639 | } | |
0f0c8159 | 640 | else if (Ustrstr(buf, US"<summary code=\"")) |
4e71661f | 641 | { |
0f0c8159 JH |
642 | malware_name = Ustrstr(buf, US"<summary code=\"11\">") |
643 | ? malware_name_internal : NULL; | |
644 | break; | |
4e71661f | 645 | } |
0f0c8159 JH |
646 | } |
647 | if (len < -1) | |
648 | { | |
649 | (void)close(sock); | |
650 | return DEFER; | |
651 | } | |
652 | break; | |
653 | } /* f-protd */ | |
c11d665d JH |
654 | #endif |
655 | ||
656 | #ifndef DISABLE_MAL_FFROT6D | |
657 | case M_FPROT6D: /* "f-prot6d" scanner type ----------------------------------- */ | |
658 | { | |
659 | int bread; | |
660 | uschar * e; | |
661 | uschar * linebuffer; | |
662 | uschar * scanrequest; | |
663 | uschar av_buffer[1024]; | |
664 | ||
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); | |
668 | ||
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); | |
672 | ||
673 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest), &errstr) < 0) | |
674 | return m_errlog_defer(scanent, CUS callout_address, errstr); | |
675 | ||
676 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
677 | ||
678 | if (bread <= 0) | |
679 | return m_errlog_defer_3(scanent, CUS callout_address, | |
680 | string_sprintf("unable to read from socket (%s)", strerror(errno)), | |
681 | sock); | |
682 | ||
683 | if (bread == sizeof(av_buffer)) | |
684 | return m_errlog_defer_3(scanent, CUS callout_address, | |
685 | US"buffer too small", sock); | |
686 | ||
687 | av_buffer[bread] = '\0'; | |
688 | linebuffer = string_copy(av_buffer); | |
689 | ||
690 | m_sock_send(sock, US"QUIT\n", 5, 0); | |
691 | ||
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); | |
b1f8e4f8 | 695 | |
c11d665d JH |
696 | if (!(malware_name = m_pcre_exec(fprot6d_re_virus, linebuffer))) |
697 | malware_name = NULL; | |
698 | ||
699 | break; | |
700 | } /* f-prot6d */ | |
701 | #endif | |
702 | ||
703 | #ifndef DISABLE_MAL_DRWEB | |
0f0c8159 JH |
704 | case M_DRWEB: /* "drweb" scanner type ----------------------------------- */ |
705 | /* v0.1 - added support for tcp sockets */ | |
706 | /* v0.0 - initial release -- support for unix sockets */ | |
707 | { | |
708 | int result; | |
709 | off_t fsize; | |
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; | |
0f0c8159 JH |
714 | |
715 | /* prepare variables */ | |
716 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
717 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
718 | ||
719 | if (*scanner_options != '/') | |
720 | { | |
721 | /* calc file size */ | |
722 | if ((drweb_fd = open(CCS eml_filename, O_RDONLY)) == -1) | |
0ea02355 | 723 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
724 | string_sprintf("can't open spool file %s: %s", |
725 | eml_filename, strerror(errno)), | |
726 | sock); | |
b1f8e4f8 | 727 | |
0f0c8159 JH |
728 | if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) |
729 | { | |
d315eda1 JH |
730 | int err; |
731 | badseek: err = errno; | |
b1f8e4f8 | 732 | (void)close(drweb_fd); |
0ea02355 | 733 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
734 | string_sprintf("can't seek spool file %s: %s", |
735 | eml_filename, strerror(err)), | |
736 | sock); | |
737 | } | |
738 | fsize_uint = (unsigned int) fsize; | |
739 | if ((off_t)fsize_uint != fsize) | |
740 | { | |
b1f8e4f8 | 741 | (void)close(drweb_fd); |
0ea02355 | 742 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
743 | string_sprintf("seeking spool file %s, size overflow", |
744 | eml_filename), | |
745 | sock); | |
4e71661f | 746 | } |
0f0c8159 | 747 | drweb_slen = htonl(fsize); |
d315eda1 JH |
748 | if (lseek(drweb_fd, 0, SEEK_SET) < 0) |
749 | goto badseek; | |
0f0c8159 | 750 | |
e1d04f48 | 751 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s remote scan [%s]\n", |
0f0c8159 JH |
752 | scanner_name, scanner_options); |
753 | ||
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)) | |
4e71661f | 759 | { |
0f0c8159 | 760 | (void)close(drweb_fd); |
0ea02355 | 761 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
762 | "unable to send commands to socket (%s)", scanner_options), |
763 | sock); | |
4e71661f | 764 | } |
8e669ac1 | 765 | |
40c90bca | 766 | if (!(drweb_fbuf = US malloc(fsize_uint))) |
0f0c8159 JH |
767 | { |
768 | (void)close(drweb_fd); | |
0ea02355 | 769 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
770 | string_sprintf("unable to allocate memory %u for file (%s)", |
771 | fsize_uint, eml_filename), | |
772 | sock); | |
773 | } | |
b1f8e4f8 | 774 | |
0f0c8159 JH |
775 | if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) |
776 | { | |
777 | int err = errno; | |
778 | (void)close(drweb_fd); | |
779 | free(drweb_fbuf); | |
0ea02355 | 780 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
781 | string_sprintf("can't read spool file %s: %s", |
782 | eml_filename, strerror(err)), | |
783 | sock); | |
784 | } | |
785 | (void)close(drweb_fd); | |
b1f8e4f8 | 786 | |
0f0c8159 JH |
787 | /* send file body to socket */ |
788 | if (send(sock, drweb_fbuf, fsize, 0) < 0) | |
4e71661f | 789 | { |
0f0c8159 | 790 | free(drweb_fbuf); |
0ea02355 | 791 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
792 | "unable to send file body to socket (%s)", scanner_options), |
793 | sock); | |
794 | } | |
0f0c8159 JH |
795 | } |
796 | else | |
797 | { | |
798 | drweb_slen = htonl(Ustrlen(eml_filename)); | |
b1f8e4f8 | 799 | |
e1d04f48 | 800 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s local scan [%s]\n", |
0f0c8159 | 801 | scanner_name, scanner_options); |
b1f8e4f8 | 802 | |
0f0c8159 JH |
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)) | |
0ea02355 | 809 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
810 | "unable to send commands to socket (%s)", scanner_options), |
811 | sock); | |
812 | } | |
b1f8e4f8 | 813 | |
0f0c8159 JH |
814 | /* wait for result */ |
815 | if (!recv_len(sock, &drweb_rc, sizeof(drweb_rc), tmo)) | |
0ea02355 | 816 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
817 | US"unable to read return code", sock); |
818 | drweb_rc = ntohl(drweb_rc); | |
819 | ||
820 | if (!recv_len(sock, &drweb_vnum, sizeof(drweb_vnum), tmo)) | |
0ea02355 | 821 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
822 | US"unable to read the number of viruses", sock); |
823 | drweb_vnum = ntohl(drweb_vnum); | |
824 | ||
825 | /* "virus(es) found" if virus number is > 0 */ | |
826 | if (drweb_vnum) | |
827 | { | |
828 | int i; | |
acec9514 | 829 | gstring * g = NULL; |
b1f8e4f8 | 830 | |
0f0c8159 JH |
831 | /* setup default virus name */ |
832 | malware_name = US"unknown"; | |
b1f8e4f8 | 833 | |
0f0c8159 | 834 | /* set up match regex */ |
476be7e2 JH |
835 | if (!drweb_re) |
836 | drweb_re = m_pcre_compile(drweb_re_str, &errstr); | |
b1f8e4f8 | 837 | |
0f0c8159 JH |
838 | /* read and concatenate virus names into one string */ |
839 | for (i = 0; i < drweb_vnum; i++) | |
4e71661f | 840 | { |
acec9514 JH |
841 | int ovector[10*3]; |
842 | ||
0f0c8159 JH |
843 | /* read the size of report */ |
844 | if (!recv_len(sock, &drweb_slen, sizeof(drweb_slen), tmo)) | |
0ea02355 | 845 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
846 | US"cannot read report size", sock); |
847 | drweb_slen = ntohl(drweb_slen); | |
848 | tmpbuf = store_get(drweb_slen); | |
b1f8e4f8 | 849 | |
0f0c8159 JH |
850 | /* read report body */ |
851 | if (!recv_len(sock, tmpbuf, drweb_slen, tmo)) | |
0ea02355 | 852 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
853 | US"cannot read report string", sock); |
854 | tmpbuf[drweb_slen] = '\0'; | |
8544e77a | 855 | |
0f0c8159 JH |
856 | /* try matcher on the line, grab substring */ |
857 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, | |
c11d665d | 858 | ovector, nelem(ovector)); |
0f0c8159 JH |
859 | if (result >= 2) |
860 | { | |
861 | const char * pre_malware_nb; | |
8e669ac1 | 862 | |
0f0c8159 | 863 | pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb); |
8e669ac1 | 864 | |
0f0c8159 | 865 | if (i==0) /* the first name we just copy to malware_name */ |
b2bcdd35 | 866 | g = string_cat(NULL, US pre_malware_nb); |
8e669ac1 | 867 | |
acec9514 | 868 | /*XXX could be string_append_listele? */ |
0f0c8159 | 869 | else /* concatenate each new virus name to previous */ |
acec9514 | 870 | g = string_append(g, 2, "/", pre_malware_nb); |
8e669ac1 | 871 | |
0f0c8159 JH |
872 | pcre_free_substring(pre_malware_nb); |
873 | } | |
874 | } | |
acec9514 | 875 | malware_name = string_from_gstring(g); |
0f0c8159 JH |
876 | } |
877 | else | |
878 | { | |
879 | const char *drweb_s = NULL; | |
880 | ||
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 */ | |
889 | if (drweb_s) | |
0ea02355 | 890 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
891 | string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s), |
892 | sock); | |
8e669ac1 | 893 | |
0f0c8159 | 894 | /* no virus found */ |
b1f8e4f8 | 895 | malware_name = NULL; |
0f0c8159 JH |
896 | } |
897 | break; | |
898 | } /* drweb */ | |
c11d665d | 899 | #endif |
8e669ac1 | 900 | |
c11d665d | 901 | #ifndef DISABLE_MAL_AVE |
0f0c8159 JH |
902 | case M_AVES: /* "aveserver" scanner type -------------------------------- */ |
903 | { | |
904 | uschar buf[32768]; | |
905 | int result; | |
8544e77a | 906 | |
0f0c8159 JH |
907 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
908 | buf[0] = 0; | |
909 | recv_line(sock, buf, sizeof(buf), tmo); | |
8544e77a | 910 | |
0f0c8159 | 911 | if (buf[0] != '2') /* aveserver is having problems */ |
0ea02355 | 912 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 | 913 | string_sprintf("unavailable (Responded: %s).", |
5903c6ff | 914 | ((buf[0] != 0) ? buf : US "nothing") ), |
0f0c8159 | 915 | sock); |
8e669ac1 | 916 | |
0f0c8159 JH |
917 | /* prepare our command */ |
918 | (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n", | |
919 | eml_filename); | |
920 | ||
921 | /* and send it */ | |
e1d04f48 | 922 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s %s\n", |
0f0c8159 JH |
923 | scanner_name, buf); |
924 | if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0) | |
0ea02355 | 925 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
926 | |
927 | malware_name = NULL; | |
928 | result = 0; | |
929 | /* read response lines, find malware name and final response */ | |
930 | while (recv_line(sock, buf, sizeof(buf), tmo) > 0) | |
931 | { | |
932 | if (buf[0] == '2') | |
933 | break; | |
934 | if (buf[0] == '5') /* aveserver is having problems */ | |
4e71661f | 935 | { |
0ea02355 | 936 | result = m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
937 | string_sprintf("unable to scan file %s (Responded: %s).", |
938 | eml_filename, buf)); | |
939 | break; | |
4e71661f | 940 | } |
0f0c8159 JH |
941 | if (Ustrncmp(buf,"322",3) == 0) |
942 | { | |
943 | uschar *p = Ustrchr(&buf[4], ' '); | |
944 | *p = '\0'; | |
945 | malware_name = string_copy(&buf[4]); | |
946 | } | |
947 | } | |
948 | ||
949 | if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0) | |
0ea02355 | 950 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
951 | |
952 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ | |
953 | buf[0] = 0; | |
954 | recv_line(sock, buf, sizeof(buf), tmo); | |
955 | ||
956 | if (buf[0] != '2') /* aveserver is having problems */ | |
0ea02355 | 957 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 | 958 | string_sprintf("unable to quit dialogue (Responded: %s).", |
5903c6ff | 959 | ((buf[0] != 0) ? buf : US "nothing") ), |
0f0c8159 JH |
960 | sock); |
961 | ||
962 | if (result == DEFER) | |
963 | { | |
964 | (void)close(sock); | |
965 | return DEFER; | |
966 | } | |
967 | break; | |
b1f8e4f8 | 968 | } /* aveserver */ |
c11d665d | 969 | #endif |
8e669ac1 | 970 | |
c11d665d | 971 | #ifndef DISABLE_MAL_FSECURE |
b1f8e4f8 JH |
972 | case M_FSEC: /* "fsecure" scanner type ---------------------------------- */ |
973 | { | |
0f0c8159 JH |
974 | int i, j, bread = 0; |
975 | uschar * file_name; | |
976 | uschar av_buffer[1024]; | |
0f0c8159 JH |
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" }; | |
981 | ||
982 | malware_name = NULL; | |
983 | ||
e1d04f48 | 984 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 JH |
985 | scanner_name, scanner_options); |
986 | /* pass options */ | |
987 | memset(av_buffer, 0, sizeof(av_buffer)); | |
c11d665d | 988 | for (i = 0; i != nelem(cmdopt); i++) |
0f0c8159 | 989 | { |
b1f8e4f8 | 990 | |
0f0c8159 | 991 | if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0) |
0ea02355 | 992 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 993 | |
0f0c8159 JH |
994 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); |
995 | if (bread > 0) av_buffer[bread]='\0'; | |
996 | if (bread < 0) | |
0ea02355 | 997 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
998 | string_sprintf("unable to read answer %d (%s)", i, strerror(errno)), |
999 | sock); | |
1000 | for (j = 0; j < bread; j++) | |
1001 | if (av_buffer[j] == '\r' || av_buffer[j] == '\n') | |
1002 | av_buffer[j] ='@'; | |
1003 | } | |
8e669ac1 | 1004 | |
0f0c8159 JH |
1005 | /* pass the mailfile to fsecure */ |
1006 | file_name = string_sprintf("SCAN\t%s\n", eml_filename); | |
b1f8e4f8 | 1007 | |
0f0c8159 | 1008 | if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0) |
0ea02355 | 1009 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1010 | |
0f0c8159 JH |
1011 | /* set up match */ |
1012 | /* todo also SUSPICION\t */ | |
476be7e2 JH |
1013 | if (!fsec_re) |
1014 | fsec_re = m_pcre_compile(fsec_re_str, &errstr); | |
b1f8e4f8 | 1015 | |
0f0c8159 JH |
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 */ | |
fd02dc0e | 1018 | { |
0f0c8159 JH |
1019 | uschar * p = av_buffer; |
1020 | uschar * q; | |
fd02dc0e | 1021 | |
0f0c8159 JH |
1022 | for (;;) |
1023 | { | |
80591636 | 1024 | errno = ETIMEDOUT; |
0f0c8159 JH |
1025 | i = av_buffer+sizeof(av_buffer)-p; |
1026 | if ((bread= ip_recv(sock, p, i-1, tmo-time(NULL))) < 0) | |
0ea02355 | 1027 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1028 | string_sprintf("unable to read result (%s)", strerror(errno)), |
1029 | sock); | |
b1f8e4f8 | 1030 | |
755762fd | 1031 | for (p[bread] = '\0'; (q = Ustrchr(p, '\n')); p = q+1) |
0f0c8159 JH |
1032 | { |
1033 | *q = '\0'; | |
fd02dc0e | 1034 | |
0f0c8159 JH |
1035 | /* Really search for virus again? */ |
1036 | if (!malware_name) | |
1037 | /* try matcher on the line, grab substring */ | |
476be7e2 | 1038 | malware_name = m_pcre_exec(fsec_re, p); |
fd02dc0e | 1039 | |
0f0c8159 JH |
1040 | if (Ustrstr(p, "OK\tScan ok.")) |
1041 | goto fsec_found; | |
1042 | } | |
fd02dc0e | 1043 | |
0f0c8159 JH |
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); | |
1047 | p = av_buffer+i; | |
fd02dc0e | 1048 | } |
b1f8e4f8 | 1049 | } |
fd02dc0e JH |
1050 | |
1051 | fsec_found: | |
b1f8e4f8 JH |
1052 | break; |
1053 | } /* fsecure */ | |
c11d665d | 1054 | #endif |
599dcb77 | 1055 | |
c11d665d | 1056 | #ifndef DISABLE_MAL_KAV |
b1f8e4f8 JH |
1057 | case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */ |
1058 | { | |
0f0c8159 JH |
1059 | time_t t; |
1060 | uschar tmpbuf[1024]; | |
1061 | uschar * scanrequest; | |
1062 | int kav_rc; | |
2decbec9 RC |
1063 | unsigned long kav_reportlen; |
1064 | int bread; | |
0f0c8159 JH |
1065 | const pcre *kav_re; |
1066 | uschar *p; | |
1067 | ||
1068 | /* get current date and time, build scan request */ | |
1069 | time(&t); | |
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 | |
1074 | fine. */ | |
1075 | ||
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, '/'); | |
1079 | if (p) | |
1080 | *p = '\0'; | |
1081 | ||
e1d04f48 | 1082 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 JH |
1083 | scanner_name, scanner_options); |
1084 | ||
1085 | /* send scan request */ | |
1086 | if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
0ea02355 | 1087 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1088 | |
0f0c8159 JH |
1089 | /* wait for result */ |
1090 | if (!recv_len(sock, tmpbuf, 2, tmo)) | |
0ea02355 | 1091 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1092 | US"unable to read 2 bytes from socket.", sock); |
b1f8e4f8 | 1093 | |
0f0c8159 JH |
1094 | /* get errorcode from one nibble */ |
1095 | kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F; | |
1096 | switch(kav_rc) | |
1097 | { | |
1098 | case 5: case 6: /* improper kavdaemon configuration */ | |
0ea02355 | 1099 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1100 | US"please reconfigure kavdaemon to NOT disinfect or remove infected files.", |
1101 | sock); | |
1102 | case 1: | |
0ea02355 | 1103 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1104 | US"reported 'scanning not completed' (code 1).", sock); |
1105 | case 7: | |
0ea02355 | 1106 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1107 | US"reported 'kavdaemon damaged' (code 7).", sock); |
1108 | } | |
b1f8e4f8 | 1109 | |
4c04137d | 1110 | /* code 8 is not handled, since it is ambiguous. It appears mostly on |
0f0c8159 | 1111 | bounces where part of a file has been cut off */ |
b1f8e4f8 | 1112 | |
0f0c8159 JH |
1113 | /* "virus found" return codes (2-4) */ |
1114 | if (kav_rc > 1 && kav_rc < 5) | |
b1f8e4f8 | 1115 | { |
0f0c8159 | 1116 | int report_flag = 0; |
599dcb77 | 1117 | |
0f0c8159 JH |
1118 | /* setup default virus name */ |
1119 | malware_name = US"unknown"; | |
b1f8e4f8 | 1120 | |
0f0c8159 | 1121 | report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ]; |
b1f8e4f8 | 1122 | |
0f0c8159 JH |
1123 | /* read the report, if available */ |
1124 | if (report_flag == 1) | |
1125 | { | |
1126 | /* read report size */ | |
1127 | if (!recv_len(sock, &kav_reportlen, 4, tmo)) | |
0ea02355 | 1128 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1129 | US"cannot read report size", sock); |
b1f8e4f8 | 1130 | |
0f0c8159 JH |
1131 | /* it's possible that avp returns av_buffer[1] == 1 but the |
1132 | reportsize is 0 (!?) */ | |
1133 | if (kav_reportlen > 0) | |
4e71661f | 1134 | { |
0f0c8159 | 1135 | /* set up match regex, depends on retcode */ |
476be7e2 JH |
1136 | if (kav_rc == 3) |
1137 | { | |
1138 | if (!kav_re_sus) kav_re_sus = m_pcre_compile(kav_re_sus_str, &errstr); | |
1139 | kav_re = kav_re_sus; | |
1140 | } | |
1141 | else | |
1142 | { | |
1143 | if (!kav_re_inf) kav_re_inf = m_pcre_compile(kav_re_inf_str, &errstr); | |
1144 | kav_re = kav_re_inf; | |
1145 | } | |
0f0c8159 | 1146 | |
6e92b3ae JH |
1147 | /* read report, linewise. Using size from stream to read amount of data |
1148 | from same stream is safe enough. */ | |
1149 | /* coverity[tainted_data] */ | |
0f0c8159 | 1150 | while (kav_reportlen > 0) |
4e71661f | 1151 | { |
0f0c8159 JH |
1152 | if ((bread = recv_line(sock, tmpbuf, sizeof(tmpbuf), tmo)) < 0) |
1153 | break; | |
1154 | kav_reportlen -= bread+1; | |
1155 | ||
1156 | /* try matcher on the line, grab substring */ | |
1157 | if ((malware_name = m_pcre_exec(kav_re, tmpbuf))) | |
1158 | break; | |
b1f8e4f8 JH |
1159 | } |
1160 | } | |
1161 | } | |
0f0c8159 JH |
1162 | } |
1163 | else /* no virus found */ | |
1164 | malware_name = NULL; | |
599dcb77 | 1165 | |
0f0c8159 | 1166 | break; |
599dcb77 | 1167 | } |
c11d665d | 1168 | #endif |
8544e77a | 1169 | |
c11d665d | 1170 | #ifndef DISABLE_MAL_CMDLINE |
b1f8e4f8 JH |
1171 | case M_CMDL: /* "cmdline" scanner type ---------------------------------- */ |
1172 | { | |
0f0c8159 JH |
1173 | const uschar *cmdline_scanner = scanner_options; |
1174 | const pcre *cmdline_trigger_re; | |
1175 | const pcre *cmdline_regex_re; | |
1176 | uschar * file_name; | |
1177 | uschar * commandline; | |
1178 | void (*eximsigchld)(int); | |
1179 | void (*eximsigpipe)(int); | |
1180 | FILE *scanner_out = NULL; | |
1181 | int scanner_fd; | |
1182 | FILE *scanner_record = NULL; | |
1183 | uschar linebuffer[32767]; | |
1184 | int rcnt; | |
1185 | int trigger = 0; | |
1186 | uschar *p; | |
1187 | ||
1188 | if (!cmdline_scanner) | |
0ea02355 | 1189 | return m_errlog_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1190 | |
0f0c8159 JH |
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) | |
0ea02355 | 1195 | return m_errlog_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1196 | |
0f0c8159 JH |
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) | |
0ea02355 | 1201 | return m_errlog_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1202 | |
0f0c8159 JH |
1203 | /* prepare scanner call; despite the naming, file_name holds a directory |
1204 | name which is documented as the value given to %s. */ | |
b1f8e4f8 | 1205 | |
0f0c8159 JH |
1206 | file_name = string_copy(eml_filename); |
1207 | p = Ustrrchr(file_name, '/'); | |
1208 | if (p) | |
1209 | *p = '\0'; | |
1210 | commandline = string_sprintf(CS cmdline_scanner, file_name); | |
b1f8e4f8 | 1211 | |
0f0c8159 JH |
1212 | /* redirect STDERR too */ |
1213 | commandline = string_sprintf("%s 2>&1", commandline); | |
b1f8e4f8 | 1214 | |
e1d04f48 | 1215 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 | 1216 | scanner_name, commandline); |
b1f8e4f8 | 1217 | |
0f0c8159 JH |
1218 | /* store exims signal handlers */ |
1219 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1220 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
b1f8e4f8 | 1221 | |
0f0c8159 JH |
1222 | if (!(scanner_out = popen(CS commandline,"r"))) |
1223 | { | |
1224 | int err = errno; | |
1225 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1226 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1227 | string_sprintf("call (%s) failed: %s.", commandline, strerror(err))); |
1228 | } | |
1229 | scanner_fd = fileno(scanner_out); | |
94a18f28 | 1230 | |
040721f2 | 1231 | file_name = string_sprintf("%s/%s_scanner_output", eml_dir, message_id); |
b1f8e4f8 | 1232 | |
0f0c8159 JH |
1233 | if (!(scanner_record = modefopen(file_name, "wb", SPOOL_MODE))) |
1234 | { | |
1235 | int err = errno; | |
1236 | (void) pclose(scanner_out); | |
1237 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1238 | return m_errlog_defer(scanent, NULL, string_sprintf( |
0f0c8159 JH |
1239 | "opening scanner output file (%s) failed: %s.", |
1240 | file_name, strerror(err))); | |
1241 | } | |
8e669ac1 | 1242 | |
0f0c8159 JH |
1243 | /* look for trigger while recording output */ |
1244 | while ((rcnt = recv_line(scanner_fd, linebuffer, | |
1245 | sizeof(linebuffer), tmo))) | |
1246 | { | |
1247 | if (rcnt < 0) | |
93a6fce2 JH |
1248 | { |
1249 | int err = errno; | |
0f0c8159 JH |
1250 | if (rcnt == -1) |
1251 | break; | |
93a6fce2 JH |
1252 | (void) pclose(scanner_out); |
1253 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1254 | return m_errlog_defer(scanent, NULL, string_sprintf( |
93a6fce2 JH |
1255 | "unable to read from scanner (%s): %s", |
1256 | commandline, strerror(err))); | |
1257 | } | |
4e71661f | 1258 | |
0f0c8159 JH |
1259 | if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record)) |
1260 | { | |
1261 | /* short write */ | |
1262 | (void) pclose(scanner_out); | |
1263 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
0ea02355 | 1264 | return m_errlog_defer(scanent, NULL, string_sprintf( |
0f0c8159 | 1265 | "short write on scanner output file (%s).", file_name)); |
4e71661f | 1266 | } |
0f0c8159 JH |
1267 | putc('\n', scanner_record); |
1268 | /* try trigger match */ | |
1269 | if ( !trigger | |
1270 | && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1) | |
1271 | ) | |
1272 | trigger = 1; | |
1273 | } | |
8e669ac1 | 1274 | |
0f0c8159 JH |
1275 | (void)fclose(scanner_record); |
1276 | sep = pclose(scanner_out); | |
1277 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1278 | if (sep != 0) | |
0ea02355 | 1279 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1280 | sep == -1 |
1281 | ? string_sprintf("running scanner failed: %s", strerror(sep)) | |
1282 | : string_sprintf("scanner returned error code: %d", sep)); | |
b1f8e4f8 | 1283 | |
0f0c8159 JH |
1284 | if (trigger) |
1285 | { | |
1286 | uschar * s; | |
1287 | /* setup default virus name */ | |
1288 | malware_name = US"unknown"; | |
b1f8e4f8 | 1289 | |
0f0c8159 JH |
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)) | |
1293 | { | |
1294 | /* try match */ | |
1295 | if ((s = m_pcre_exec(cmdline_regex_re, linebuffer))) | |
1296 | malware_name = s; | |
4e71661f | 1297 | } |
0f0c8159 JH |
1298 | (void)fclose(scanner_record); |
1299 | } | |
1300 | else /* no virus found */ | |
1301 | malware_name = NULL; | |
1302 | break; | |
b1f8e4f8 | 1303 | } /* cmdline */ |
c11d665d | 1304 | #endif |
599dcb77 | 1305 | |
c11d665d | 1306 | #ifndef DISABLE_MAL_SOPHIE |
b1f8e4f8 JH |
1307 | case M_SOPHIE: /* "sophie" scanner type --------------------------------- */ |
1308 | { | |
0f0c8159 JH |
1309 | int bread = 0; |
1310 | uschar *p; | |
1311 | uschar * file_name; | |
1312 | uschar av_buffer[1024]; | |
b1f8e4f8 | 1313 | |
0f0c8159 JH |
1314 | /* pass the scan directory to sophie */ |
1315 | file_name = string_copy(eml_filename); | |
1316 | if ((p = Ustrrchr(file_name, '/'))) | |
1317 | *p = '\0'; | |
b1f8e4f8 | 1318 | |
e1d04f48 | 1319 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 | 1320 | scanner_name, scanner_options); |
b1f8e4f8 | 1321 | |
0f0c8159 JH |
1322 | if ( write(sock, file_name, Ustrlen(file_name)) < 0 |
1323 | || write(sock, "\n", 1) != 1 | |
1324 | ) | |
0ea02355 | 1325 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1326 | string_sprintf("unable to write to UNIX socket (%s)", scanner_options), |
1327 | sock); | |
b1f8e4f8 | 1328 | |
0f0c8159 JH |
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) | |
0ea02355 | 1332 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1333 | string_sprintf("unable to read from UNIX socket (%s)", scanner_options), |
1334 | sock); | |
1335 | ||
1336 | /* infected ? */ | |
1337 | if (av_buffer[0] == '1') { | |
1338 | uschar * s = Ustrchr(av_buffer, '\n'); | |
1339 | if (s) | |
1340 | *s = '\0'; | |
1341 | malware_name = string_copy(&av_buffer[2]); | |
1342 | } | |
1343 | else if (!strncmp(CS av_buffer, "-1", 2)) | |
0ea02355 JH |
1344 | return m_errlog_defer_3(scanent, CUS callout_address, |
1345 | US"scanner reported error", sock); | |
0f0c8159 JH |
1346 | else /* all ok, no virus */ |
1347 | malware_name = NULL; | |
599dcb77 | 1348 | |
0f0c8159 | 1349 | break; |
8544e77a | 1350 | } |
c11d665d | 1351 | #endif |
8e669ac1 | 1352 | |
c11d665d | 1353 | #ifndef DISABLE_MAL_CLAM |
b1f8e4f8 JH |
1354 | case M_CLAMD: /* "clamd" scanner type ----------------------------------- */ |
1355 | { | |
0f0c8159 JH |
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 | |
e5ba8aa7 | 1364 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM |
0f0c8159 JH |
1365 | * See Exim bug 926 for details. */ |
1366 | ||
80591636 | 1367 | uschar *p, *vname, *result_tag; |
0f0c8159 | 1368 | int bread=0; |
0f0c8159 JH |
1369 | uschar av_buffer[1024]; |
1370 | uschar *hostname = US""; | |
1371 | host_item connhost; | |
1372 | uschar *clamav_fbuf; | |
1373 | int clam_fd, result; | |
1374 | off_t fsize; | |
1375 | unsigned int fsize_uint; | |
1376 | BOOL use_scan_command = FALSE; | |
8a512ed5 | 1377 | clamd_address * cv[MAX_CLAMD_SERVERS]; |
0f0c8159 | 1378 | int num_servers = 0; |
0f0c8159 | 1379 | uint32_t send_size, send_final_zeroblock; |
4a5cbaff | 1380 | blob cmd_str; |
0f0c8159 | 1381 | |
8a512ed5 JH |
1382 | /*XXX if unixdomain socket, only one server supported. Needs fixing; |
1383 | there's no reason we should not mix local and remote servers */ | |
1384 | ||
0f0c8159 | 1385 | if (*scanner_options == '/') |
8a512ed5 JH |
1386 | { |
1387 | clamd_address * cd; | |
1388 | const uschar * sublist; | |
1389 | int subsep = ' '; | |
1390 | ||
0f0c8159 JH |
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; | |
8a512ed5 JH |
1394 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
1395 | ||
1396 | /* extract socket-path part */ | |
1397 | sublist = scanner_options; | |
1398 | cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0); | |
1399 | ||
1400 | /* parse options */ | |
1401 | if (clamd_option(cd, sublist, &subsep) != OK) | |
0ea02355 | 1402 | return m_errlog_defer(scanent, NULL, |
8a512ed5 JH |
1403 | string_sprintf("bad option '%s'", scanner_options)); |
1404 | cv[0] = cd; | |
1405 | } | |
0f0c8159 JH |
1406 | else |
1407 | { | |
0f0c8159 JH |
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 */ | |
1412 | do | |
4e71661f | 1413 | { |
8a512ed5 JH |
1414 | clamd_address * cd; |
1415 | const uschar * sublist; | |
1416 | int subsep = ' '; | |
1417 | uschar * s; | |
b1f8e4f8 | 1418 | |
0f0c8159 JH |
1419 | /* The 'local' option means use the SCAN command over the network |
1420 | * socket (ie common file storage in use) */ | |
8a512ed5 JH |
1421 | /*XXX we could accept this also as a local option? */ |
1422 | if (strcmpic(scanner_options, US"local") == 0) | |
0f0c8159 JH |
1423 | { |
1424 | use_scan_command = TRUE; | |
1425 | continue; | |
1426 | } | |
b1f8e4f8 | 1427 | |
8a512ed5 | 1428 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
b1f8e4f8 | 1429 | |
0f0c8159 | 1430 | /* extract host and port part */ |
8a512ed5 JH |
1431 | sublist = scanner_options; |
1432 | if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
1433 | { | |
0ea02355 | 1434 | (void) m_errlog_defer(scanent, NULL, |
8a512ed5 JH |
1435 | string_sprintf("missing address: '%s'", scanner_options)); |
1436 | continue; | |
1437 | } | |
1438 | if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
0f0c8159 | 1439 | { |
0ea02355 | 1440 | (void) m_errlog_defer(scanent, NULL, |
8a512ed5 JH |
1441 | string_sprintf("missing port: '%s'", scanner_options)); |
1442 | continue; | |
1443 | } | |
93a6fce2 | 1444 | cd->tcp_port = atoi(CS s); |
8a512ed5 JH |
1445 | |
1446 | /* parse options */ | |
1447 | /*XXX should these options be common over scanner types? */ | |
1448 | if (clamd_option(cd, sublist, &subsep) != OK) | |
0ea02355 | 1449 | return m_errlog_defer(scanent, NULL, |
8a512ed5 | 1450 | string_sprintf("bad option '%s'", scanner_options)); |
b1f8e4f8 | 1451 | |
8a512ed5 | 1452 | cv[num_servers++] = cd; |
0f0c8159 JH |
1453 | if (num_servers >= MAX_CLAMD_SERVERS) |
1454 | { | |
0ea02355 | 1455 | (void) m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1456 | US"More than " MAX_CLAMD_SERVERS_S " clamd servers " |
1457 | "specified; only using the first " MAX_CLAMD_SERVERS_S ); | |
1458 | break; | |
1459 | } | |
8a512ed5 JH |
1460 | } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep, |
1461 | NULL, 0))); | |
8e669ac1 | 1462 | |
0f0c8159 JH |
1463 | /* check if we have at least one server */ |
1464 | if (!num_servers) | |
0ea02355 | 1465 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1466 | US"no useable server addresses in malware configuration option."); |
1467 | } | |
b1f8e4f8 | 1468 | |
0f0c8159 JH |
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, ':')) | |
0ea02355 | 1472 | return m_errlog_defer(scanent, NULL, |
0f0c8159 JH |
1473 | string_sprintf("local/SCAN mode incompatible with" \ |
1474 | " : in path to email filename [%s]", eml_filename)); | |
b1f8e4f8 | 1475 | |
4a5cbaff JH |
1476 | /* Set up the very first data we will be sending */ |
1477 | if (!use_scan_command) | |
4a5cbaff | 1478 | { cmd_str.data = US"zINSTREAM"; cmd_str.len = 10; } |
4a5cbaff JH |
1479 | else |
1480 | { | |
1481 | cmd_str.data = string_sprintf("SCAN %s\n", eml_filename); | |
1482 | cmd_str.len = Ustrlen(cmd_str.data); | |
1483 | } | |
1484 | ||
0f0c8159 JH |
1485 | /* We have some network servers specified */ |
1486 | if (num_servers) | |
1487 | { | |
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. */ | |
b1f8e4f8 | 1491 | |
0f0c8159 JH |
1492 | while (num_servers > 0) |
1493 | { | |
4a5cbaff | 1494 | int i = random_number(num_servers); |
8a512ed5 | 1495 | clamd_address * cd = cv[i]; |
b1f8e4f8 | 1496 | |
e1d04f48 | 1497 | DEBUG(D_acl) debug_printf_indent("trying server name %s, port %u\n", |
8a512ed5 | 1498 | cd->hostspec, cd->tcp_port); |
0f0c8159 JH |
1499 | |
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) */ | |
8a512ed5 | 1502 | for (;;) |
0f0c8159 | 1503 | { |
4a5cbaff JH |
1504 | if ((sock = m_tcpsocket(cd->hostspec, cd->tcp_port, |
1505 | &connhost, &errstr, &cmd_str)) >= 0) | |
8a512ed5 JH |
1506 | { |
1507 | /* Connection successfully established with a server */ | |
1508 | hostname = cd->hostspec; | |
4a5cbaff | 1509 | cmd_str.len = 0; |
8a512ed5 JH |
1510 | break; |
1511 | } | |
1512 | if (cd->retry <= 0) break; | |
1513 | while (cd->retry > 0) cd->retry = sleep(cd->retry); | |
4e71661f | 1514 | } |
8a512ed5 JH |
1515 | if (sock >= 0) |
1516 | break; | |
b1f8e4f8 | 1517 | |
0ea02355 | 1518 | (void) m_errlog_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1519 | |
1520 | /* Remove the server from the list. XXX We should free the memory */ | |
1521 | num_servers--; | |
8a512ed5 JH |
1522 | for (; i < num_servers; i++) |
1523 | cv[i] = cv[i+1]; | |
4e71661f | 1524 | } |
8e669ac1 | 1525 | |
0f0c8159 | 1526 | if (num_servers == 0) |
0ea02355 | 1527 | return m_errlog_defer(scanent, NULL, US"all servers failed"); |
0f0c8159 JH |
1528 | } |
1529 | else | |
8a512ed5 JH |
1530 | for (;;) |
1531 | { | |
1532 | if ((sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0) | |
1533 | { | |
1534 | hostname = cv[0]->hostspec; | |
1535 | break; | |
1536 | } | |
1537 | if (cv[0]->retry <= 0) | |
0ea02355 | 1538 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
8a512ed5 JH |
1539 | while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry); |
1540 | } | |
b1f8e4f8 | 1541 | |
0f0c8159 JH |
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. */ | |
1546 | ||
1547 | if (!use_scan_command) | |
1548 | { | |
0f0c8159 JH |
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 | |
1551 | chunk. */ | |
b1f8e4f8 | 1552 | |
e1d04f48 | 1553 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
1554 | "Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", |
1555 | scanner_name); | |
b1f8e4f8 | 1556 | |
4a5cbaff JH |
1557 | /* Pass the string to ClamAV (10 = "zINSTREAM\0"), if not already sent */ |
1558 | if (cmd_str.len) | |
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)", | |
1562 | strerror(errno)), | |
1563 | sock); | |
b1f8e4f8 | 1564 | |
0f0c8159 JH |
1565 | /* calc file size */ |
1566 | if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) | |
1567 | { | |
1568 | int err = errno; | |
0ea02355 | 1569 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1570 | string_sprintf("can't open spool file %s: %s", |
1571 | eml_filename, strerror(err)), | |
1572 | sock); | |
1573 | } | |
1574 | if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) | |
1575 | { | |
d315eda1 JH |
1576 | int err; |
1577 | b_seek: err = errno; | |
e5ba8aa7 | 1578 | (void)close(clam_fd); |
0ea02355 | 1579 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1580 | string_sprintf("can't seek spool file %s: %s", |
1581 | eml_filename, strerror(err)), | |
1582 | sock); | |
1583 | } | |
1584 | fsize_uint = (unsigned int) fsize; | |
1585 | if ((off_t)fsize_uint != fsize) | |
1586 | { | |
e5ba8aa7 | 1587 | (void)close(clam_fd); |
0ea02355 | 1588 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1589 | string_sprintf("seeking spool file %s, size overflow", |
1590 | eml_filename), | |
1591 | sock); | |
1592 | } | |
d315eda1 JH |
1593 | if (lseek(clam_fd, 0, SEEK_SET) < 0) |
1594 | goto b_seek; | |
b1f8e4f8 | 1595 | |
40c90bca | 1596 | if (!(clamav_fbuf = US malloc(fsize_uint))) |
0f0c8159 | 1597 | { |
e5ba8aa7 | 1598 | (void)close(clam_fd); |
0ea02355 | 1599 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1600 | string_sprintf("unable to allocate memory %u for file (%s)", |
1601 | fsize_uint, eml_filename), | |
1602 | sock); | |
1603 | } | |
b1f8e4f8 | 1604 | |
0f0c8159 JH |
1605 | if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0) |
1606 | { | |
1607 | int err = errno; | |
e5ba8aa7 | 1608 | free(clamav_fbuf); (void)close(clam_fd); |
0ea02355 | 1609 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1610 | string_sprintf("can't read spool file %s: %s", |
1611 | eml_filename, strerror(err)), | |
1612 | sock); | |
1613 | } | |
1614 | (void)close(clam_fd); | |
b1f8e4f8 | 1615 | |
0f0c8159 | 1616 | /* send file body to socket */ |
0f0c8159 JH |
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)) | |
1622 | { | |
b1f8e4f8 | 1623 | free(clamav_fbuf); |
0ea02355 | 1624 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1625 | string_sprintf("unable to send file body to socket (%s)", hostname), |
1626 | sock); | |
4e71661f | 1627 | } |
b1f8e4f8 | 1628 | |
0f0c8159 | 1629 | free(clamav_fbuf); |
0f0c8159 JH |
1630 | } |
1631 | else | |
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 */ | |
1635 | ||
1636 | /* ================================================================= */ | |
1637 | ||
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. */ | |
4a5cbaff | 1646 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0), if not already sent */ |
0f0c8159 | 1647 | |
e1d04f48 | 1648 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
1649 | "Malware scan: issuing %s local-path scan [%s]\n", |
1650 | scanner_name, scanner_options); | |
b1f8e4f8 | 1651 | |
4a5cbaff JH |
1652 | if (cmd_str.len) |
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)), | |
1656 | sock); | |
b1f8e4f8 | 1657 | |
0f0c8159 JH |
1658 | /* Do not shut down the socket for writing; a user report noted that |
1659 | * clamd 0.70 does not react well to this. */ | |
1660 | } | |
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. */ | |
1663 | ||
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)); | |
1667 | (void)close(sock); | |
1668 | sock = -1; | |
1669 | ||
1670 | if (bread <= 0) | |
0ea02355 | 1671 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1672 | string_sprintf("unable to read from socket (%s)", |
1673 | errno == 0 ? "EOF" : strerror(errno))); | |
1674 | ||
1675 | if (bread == sizeof(av_buffer)) | |
0ea02355 JH |
1676 | return m_errlog_defer(scanent, CUS callout_address, |
1677 | US"buffer too small"); | |
0f0c8159 JH |
1678 | /* We're now assured of a NULL at the end of av_buffer */ |
1679 | ||
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 | |
1690 | ||
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). | |
1695 | ||
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). */ | |
1699 | ||
1700 | if (!(*av_buffer)) | |
0ea02355 JH |
1701 | return m_errlog_defer(scanent, CUS callout_address, |
1702 | US"ClamAV returned null"); | |
0f0c8159 JH |
1703 | |
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'; | |
1709 | ||
e1d04f48 | 1710 | DEBUG(D_acl) debug_printf_indent("Malware response: %s\n", av_buffer); |
0f0c8159 JH |
1711 | |
1712 | while (isspace(*--p) && (p > av_buffer)) | |
1713 | *p = '\0'; | |
1714 | if (*p) ++p; | |
0f0c8159 JH |
1715 | |
1716 | /* colon in returned output? */ | |
80591636 | 1717 | if(!(p = Ustrchr(av_buffer,':'))) |
0ea02355 | 1718 | return m_errlog_defer(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
1719 | "ClamAV returned malformed result (missing colon): %s", |
1720 | av_buffer)); | |
1721 | ||
1722 | /* strip filename */ | |
1723 | while (*p && isspace(*++p)) /**/; | |
1724 | vname = p; | |
1725 | ||
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; | |
1730 | ||
1731 | if (Ustrcmp(result_tag, "FOUND") == 0) | |
1732 | { | |
1733 | /* p should still be the whitespace before the result_tag */ | |
1734 | while (isspace(*p)) --p; | |
1735 | *++p = '\0'; | |
1736 | /* Strip off the extended information too, which will be in parens | |
1737 | after the virus name, with no intervening whitespace. */ | |
1738 | if (*--p == ')') | |
4e71661f | 1739 | { |
0f0c8159 JH |
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, '('); | |
1743 | if (p) | |
1744 | *p = '\0'; | |
4e71661f | 1745 | } |
0f0c8159 | 1746 | malware_name = string_copy(vname); |
e1d04f48 | 1747 | DEBUG(D_acl) debug_printf_indent("Malware found, name \"%s\"\n", malware_name); |
b1f8e4f8 | 1748 | |
0f0c8159 JH |
1749 | } |
1750 | else if (Ustrcmp(result_tag, "ERROR") == 0) | |
0ea02355 | 1751 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 | 1752 | string_sprintf("ClamAV returned: %s", av_buffer)); |
b1f8e4f8 | 1753 | |
0f0c8159 JH |
1754 | else if (Ustrcmp(result_tag, "OK") == 0) |
1755 | { | |
1756 | /* Everything should be OK */ | |
1757 | malware_name = NULL; | |
e1d04f48 | 1758 | DEBUG(D_acl) debug_printf_indent("Malware not found\n"); |
b1f8e4f8 | 1759 | |
0f0c8159 JH |
1760 | } |
1761 | else | |
0ea02355 | 1762 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1763 | string_sprintf("unparseable response from ClamAV: {%s}", av_buffer)); |
1764 | ||
1765 | break; | |
b1f8e4f8 | 1766 | } /* clamd */ |
c11d665d | 1767 | #endif |
b1f8e4f8 | 1768 | |
c11d665d | 1769 | #ifndef DISABLE_MAL_SOCK |
b1f8e4f8 | 1770 | case M_SOCK: /* "sock" scanner type ------------------------------------- */ |
0f0c8159 JH |
1771 | /* This code was derived by Martin Poole from the clamd code contributed |
1772 | by David Saez and the cmdline code | |
1773 | */ | |
b1f8e4f8 | 1774 | { |
0f0c8159 JH |
1775 | int bread; |
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; | |
1783 | ||
1784 | /* find scanner command line */ | |
ac4d558b JH |
1785 | if ( (sockline_scanner = string_nextinlist(&av_scanner_work, &sep, |
1786 | NULL, 0)) | |
1787 | && *sockline_scanner | |
1788 | ) | |
0f0c8159 JH |
1789 | { /* check for no expansions apart from one %s */ |
1790 | uschar * s = Ustrchr(sockline_scanner, '%'); | |
1791 | if (s++) | |
1792 | if ((*s != 's' && *s != '%') || Ustrchr(s+1, '%')) | |
0ea02355 | 1793 | return m_errlog_defer_3(scanent, NULL, |
0f0c8159 JH |
1794 | US"unsafe sock scanner call spec", sock); |
1795 | } | |
1796 | else | |
1797 | sockline_scanner = sockline_scanner_default; | |
ac4d558b JH |
1798 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "cmdline: ", |
1799 | string_printing(sockline_scanner)); | |
b1f8e4f8 | 1800 | |
0f0c8159 JH |
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) | |
0ea02355 | 1805 | return m_errlog_defer_3(scanent, NULL, errstr, sock); |
b1f8e4f8 | 1806 | |
0f0c8159 JH |
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) | |
0ea02355 | 1811 | return m_errlog_defer_3(scanent, NULL, errstr, sock); |
b1f8e4f8 | 1812 | |
0f0c8159 | 1813 | /* prepare scanner call - security depends on expansions check above */ |
040721f2 | 1814 | commandline = string_sprintf( CS sockline_scanner, CS eml_filename); |
ac4d558b JH |
1815 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "expanded: ", |
1816 | string_printing(commandline)); | |
b1f8e4f8 | 1817 | |
0f0c8159 JH |
1818 | /* Pass the command string to the socket */ |
1819 | if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0) | |
0ea02355 | 1820 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1821 | |
0f0c8159 JH |
1822 | /* Read the result */ |
1823 | bread = ip_recv(sock, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
b1f8e4f8 | 1824 | |
0f0c8159 | 1825 | if (bread <= 0) |
0ea02355 | 1826 | return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
1827 | string_sprintf("unable to read from socket (%s)", strerror(errno)), |
1828 | sock); | |
b1f8e4f8 | 1829 | |
0f0c8159 | 1830 | if (bread == sizeof(av_buffer)) |
0ea02355 JH |
1831 | return m_errlog_defer_3(scanent, CUS callout_address, |
1832 | US"buffer too small", sock); | |
0f0c8159 JH |
1833 | av_buffer[bread] = '\0'; |
1834 | linebuffer = string_copy(av_buffer); | |
ac4d558b JH |
1835 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "answer: ", |
1836 | string_printing(linebuffer)); | |
b1f8e4f8 | 1837 | |
0f0c8159 JH |
1838 | /* try trigger match */ |
1839 | if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) | |
1840 | { | |
1841 | if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer))) | |
1842 | malware_name = US "unknown"; | |
ac4d558b JH |
1843 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "name: ", |
1844 | string_printing(malware_name)); | |
b1f8e4f8 | 1845 | } |
0f0c8159 JH |
1846 | else /* no virus found */ |
1847 | malware_name = NULL; | |
1848 | break; | |
8523533c | 1849 | } |
c11d665d | 1850 | #endif |
8e669ac1 | 1851 | |
c11d665d | 1852 | #ifndef DISABLE_MAL_MKS |
b1f8e4f8 JH |
1853 | case M_MKSD: /* "mksd" scanner type ------------------------------------- */ |
1854 | { | |
0f0c8159 JH |
1855 | char *mksd_options_end; |
1856 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1857 | int retval; | |
b1f8e4f8 | 1858 | |
0f0c8159 JH |
1859 | if (scanner_options) |
1860 | { | |
1861 | mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10); | |
1862 | if ( *scanner_options == '\0' | |
1863 | || *mksd_options_end != '\0' | |
1864 | || mksd_maxproc < 1 | |
1865 | || mksd_maxproc > 32 | |
1866 | ) | |
0ea02355 | 1867 | return m_errlog_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1868 | string_sprintf("invalid option '%s'", scanner_options)); |
1869 | } | |
8e669ac1 | 1870 | |
3e60dd41 | 1871 | if((sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0) |
0ea02355 | 1872 | return m_errlog_defer(scanent, CUS callout_address, errstr); |
8e669ac1 | 1873 | |
0f0c8159 | 1874 | malware_name = NULL; |
94a18f28 | 1875 | |
e1d04f48 | 1876 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan\n", scanner_name); |
94a18f28 | 1877 | |
0f0c8159 JH |
1878 | if ((retval = mksd_scan_packed(scanent, sock, eml_filename, tmo)) != OK) |
1879 | { | |
1880 | close (sock); | |
1881 | return retval; | |
1882 | } | |
1883 | break; | |
8523533c | 1884 | } |
c11d665d | 1885 | #endif |
0f0c8159 | 1886 | |
c11d665d | 1887 | #ifndef DISABLE_MAL_AVAST |
b6fbf22d JH |
1888 | case M_AVAST: /* "avast" scanner type ----------------------------------- */ |
1889 | { | |
1890 | int ovector[1*3]; | |
1891 | uschar buf[1024]; | |
1892 | uschar * scanrequest; | |
b6fbf22d | 1893 | enum {AVA_HELO, AVA_OPT, AVA_RSP, AVA_DONE} avast_stage; |
0f0c8159 | 1894 | int nread; |
b6fbf22d JH |
1895 | |
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 | |
1900 | and the [ ] marker. | |
1901 | [+] - not infected | |
1902 | [L] - infected | |
1903 | [E] - some error occured | |
1904 | Such marker follows the first non-escaped TAB. */ | |
476be7e2 JH |
1905 | if ( ( !ava_re_clean |
1906 | && !(ava_re_clean = m_pcre_compile(ava_re_clean_str, &errstr))) | |
1907 | || ( !ava_re_virus | |
1908 | && !(ava_re_virus = m_pcre_compile(ava_re_virus_str, &errstr))) | |
b6fbf22d JH |
1909 | ) |
1910 | return malware_errlog_defer(errstr); | |
1911 | ||
1912 | /* wait for result */ | |
0f0c8159 JH |
1913 | for (avast_stage = AVA_HELO; |
1914 | (nread = recv_line(sock, buf, sizeof(buf), tmo)) > 0; | |
1915 | ) | |
b6fbf22d JH |
1916 | { |
1917 | int slen = Ustrlen(buf); | |
94431adb | 1918 | if (slen >= 1) |
b6fbf22d | 1919 | { |
e1d04f48 | 1920 | DEBUG(D_acl) debug_printf_indent("got from avast: %s\n", buf); |
b6fbf22d JH |
1921 | switch (avast_stage) |
1922 | { | |
1923 | case AVA_HELO: | |
1924 | if (Ustrncmp(buf, "220", 3) != 0) | |
1925 | goto endloop; /* require a 220 */ | |
1926 | goto sendreq; | |
1927 | ||
1928 | case AVA_OPT: | |
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 */ | |
1933 | ||
1934 | sendreq: | |
1935 | { | |
1936 | int len; | |
1937 | /* Check for another option to send. Newline-terminate it. */ | |
1938 | if ((scanrequest = string_nextinlist(&av_scanner_work, &sep, | |
1939 | NULL, 0))) | |
1940 | { | |
1941 | scanrequest = string_sprintf("%s\n", scanrequest); | |
1942 | avast_stage = AVA_OPT; /* just sent option */ | |
1943 | } | |
1944 | else | |
1945 | { | |
040721f2 | 1946 | scanrequest = string_sprintf("SCAN %s\n", eml_dir); |
b6fbf22d JH |
1947 | avast_stage = AVA_RSP; /* just sent command */ |
1948 | } | |
1949 | ||
1950 | /* send config-cmd or scan-request to socket */ | |
1951 | len = Ustrlen(scanrequest); | |
1952 | if (send(sock, scanrequest, len, 0) < 0) | |
1953 | { | |
1954 | scanrequest[len-1] = '\0'; | |
0ea02355 | 1955 | return m_errlog_defer_3(scanent, CUS callout_address, string_sprintf( |
b6fbf22d JH |
1956 | "unable to send request '%s' to socket (%s): %s", |
1957 | scanrequest, scanner_options, strerror(errno)), sock); | |
1958 | } | |
1959 | break; | |
1960 | } | |
1961 | ||
1962 | case AVA_RSP: | |
1963 | if (Ustrncmp(buf, "210", 3) == 0) | |
1964 | break; /* ignore the "210 SCAN DATA" message */ | |
1965 | ||
476be7e2 | 1966 | if (pcre_exec(ava_re_clean, NULL, CS buf, slen, |
c11d665d | 1967 | 0, 0, ovector, nelem(ovector)) > 0) |
b6fbf22d JH |
1968 | break; |
1969 | ||
476be7e2 | 1970 | if ((malware_name = m_pcre_exec(ava_re_virus, buf))) |
b6fbf22d JH |
1971 | { /* remove backslash in front of [whitespace|backslash] */ |
1972 | uschar * p, * p0; | |
94431adb | 1973 | for (p = malware_name; *p; ++p) |
b6fbf22d JH |
1974 | if (*p == '\\' && (isspace(p[1]) || p[1] == '\\')) |
1975 | for (p0 = p; *p0; ++p0) *p0 = p0[1]; | |
94431adb | 1976 | |
b6fbf22d JH |
1977 | avast_stage = AVA_DONE; |
1978 | goto endloop; | |
1979 | } | |
1980 | ||
94431adb | 1981 | if (Ustrncmp(buf, "200 SCAN OK", 11) == 0) |
b6fbf22d JH |
1982 | { /* we're done finally */ |
1983 | if (send(sock, "QUIT\n", 5, 0) < 0) /* courtesy */ | |
0ea02355 JH |
1984 | return m_errlog_defer_3(scanent, CUS callout_address, |
1985 | string_sprintf( | |
b6fbf22d JH |
1986 | "unable to send quit request to socket (%s): %s", |
1987 | scanner_options, strerror(errno)), | |
1988 | sock); | |
1989 | malware_name = NULL; | |
1990 | avast_stage = AVA_DONE; | |
1991 | goto endloop; | |
1992 | } | |
1993 | ||
1994 | /* here for any unexpected response from the scanner */ | |
1995 | goto endloop; | |
755762fd HSHR |
1996 | |
1997 | case AVA_DONE: log_write(0, LOG_PANIC, "%s:%d:%s: should not happen", | |
1998 | __FILE__, __LINE__, __FUNCTION__); | |
b6fbf22d | 1999 | } |
0f0c8159 | 2000 | } |
b6fbf22d | 2001 | } |
b6fbf22d JH |
2002 | endloop: |
2003 | ||
2004 | switch(avast_stage) | |
2005 | { | |
94431adb | 2006 | case AVA_HELO: |
b6fbf22d | 2007 | case AVA_OPT: |
0ea02355 | 2008 | case AVA_RSP: return m_errlog_defer_3(scanent, CUS callout_address, |
0f0c8159 JH |
2009 | nread >= 0 |
2010 | ? string_sprintf( | |
2011 | "invalid response from scanner: '%s'", buf) | |
2012 | : nread == -1 | |
2013 | ? US"EOF from scanner" | |
2014 | : US"timeout from scanner", | |
2015 | sock); | |
b6fbf22d JH |
2016 | default: break; |
2017 | } | |
71b32d41 | 2018 | break; |
b6fbf22d | 2019 | } |
c11d665d | 2020 | #endif |
0f0c8159 | 2021 | } /* scanner type switch */ |
8523533c | 2022 | |
0f0c8159 JH |
2023 | if (sock >= 0) |
2024 | (void) close (sock); | |
2025 | malware_ok = TRUE; /* set "been here, done that" marker */ | |
b1f8e4f8 | 2026 | } |
8523533c | 2027 | |
0f0c8159 JH |
2028 | /* match virus name against pattern (caseless ------->----------v) */ |
2029 | if (malware_name && regex_match_and_setup(re, malware_name, 0, -1)) | |
2030 | { | |
e1d04f48 | 2031 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
2032 | "Matched regex to malware [%s] [%s]\n", malware_re, malware_name); |
2033 | return OK; | |
2034 | } | |
2035 | else | |
2036 | return FAIL; | |
8523533c TK |
2037 | } |
2038 | ||
2039 | ||
0f0c8159 JH |
2040 | /************************************************* |
2041 | * Scan an email for malware * | |
2042 | *************************************************/ | |
8523533c | 2043 | |
0f0c8159 JH |
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. | |
8523533c | 2046 | |
0f0c8159 JH |
2047 | Arguments: |
2048 | malware_re match condition for "malware=" | |
2049 | timeout if nonzero, timeout in seconds | |
2050 | ||
2051 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
2052 | where true means malware was found (condition applies) | |
2053 | */ | |
2054 | int | |
2055 | malware(const uschar * malware_re, int timeout) | |
8523533c | 2056 | { |
040721f2 | 2057 | int ret = malware_internal(malware_re, NULL, timeout); |
8e669ac1 | 2058 | |
55240832 | 2059 | if (ret == DEFER) av_failed = TRUE; |
55240832 | 2060 | return ret; |
8523533c TK |
2061 | } |
2062 | ||
8e669ac1 | 2063 | |
0f0c8159 JH |
2064 | /************************************************* |
2065 | * Scan a file for malware * | |
2066 | *************************************************/ | |
8e669ac1 | 2067 | |
0f0c8159 JH |
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. | |
8e669ac1 | 2072 | |
0f0c8159 JH |
2073 | Arguments: |
2074 | eml_filename a file holding the message to be scanned | |
8523533c | 2075 | |
0f0c8159 JH |
2076 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) |
2077 | where true means malware was found (condition applies) | |
2078 | */ | |
2079 | int | |
2080 | malware_in_file(uschar *eml_filename) | |
8523533c | 2081 | { |
55240832 JH |
2082 | uschar message_id_buf[64]; |
2083 | int ret; | |
2084 | ||
2085 | /* spool_mbox() assumes various parameters exist, when creating | |
2086 | the relevant directory and the email within */ | |
2087 | ||
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"; | |
2092 | return_path = US""; | |
2093 | recipients_list = NULL; | |
2094 | receive_add_recipient(US"malware-victim@example.net", -1); | |
2095 | enable_dollar_recipients = TRUE; | |
2096 | ||
040721f2 | 2097 | ret = malware_internal(US"*", eml_filename, 0); |
55240832 JH |
2098 | |
2099 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); | |
2100 | spool_mbox_ok = 1; | |
2101 | ||
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 */ | |
2104 | ||
2105 | unspool_mbox(); | |
2106 | ||
2107 | /* silence static analysis tools */ | |
2108 | message_id = NULL; | |
2109 | ||
2110 | return ret; | |
8523533c TK |
2111 | } |
2112 | ||
476be7e2 JH |
2113 | |
2114 | void | |
2115 | malware_init(void) | |
2116 | { | |
2117 | if (!malware_default_re) | |
2118 | malware_default_re = regex_must_compile(malware_regex_default, FALSE, TRUE); | |
c11d665d JH |
2119 | |
2120 | #ifndef DISABLE_MAL_DRWEB | |
476be7e2 JH |
2121 | if (!drweb_re) |
2122 | drweb_re = regex_must_compile(drweb_re_str, FALSE, TRUE); | |
c11d665d JH |
2123 | #endif |
2124 | #ifndef DISABLE_MAL_FSECURE | |
476be7e2 JH |
2125 | if (!fsec_re) |
2126 | fsec_re = regex_must_compile(fsec_re_str, FALSE, TRUE); | |
c11d665d JH |
2127 | #endif |
2128 | #ifndef DISABLE_MAL_KAV | |
476be7e2 JH |
2129 | if (!kav_re_sus) |
2130 | kav_re_sus = regex_must_compile(kav_re_sus_str, FALSE, TRUE); | |
2131 | if (!kav_re_inf) | |
2132 | kav_re_inf = regex_must_compile(kav_re_inf_str, FALSE, TRUE); | |
c11d665d JH |
2133 | #endif |
2134 | #ifndef DISABLE_MAL_AVA | |
476be7e2 JH |
2135 | if (!ava_re_clean) |
2136 | ava_re_clean = regex_must_compile(ava_re_clean_str, FALSE, TRUE); | |
2137 | if (!ava_re_virus) | |
2138 | ava_re_virus = regex_must_compile(ava_re_virus_str, FALSE, TRUE); | |
c11d665d JH |
2139 | #endif |
2140 | #ifndef DISABLE_MAL_FPROT6D | |
71b32d41 ACK |
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); | |
c11d665d JH |
2145 | #endif |
2146 | } | |
2147 | ||
2148 | ||
2149 | void | |
2150 | malware_show_supported(FILE * f) | |
2151 | { | |
2152 | struct scan * sc; | |
2153 | fprintf(f, "Malware:"); | |
2154 | for (sc = m_scans; sc->scancode != -1; sc++) fprintf(f, " %s", sc->name); | |
2155 | fprintf(f, "\n"); | |
476be7e2 JH |
2156 | } |
2157 | ||
c11d665d JH |
2158 | |
2159 | # endif /*!MACRO_PREDEF*/ | |
b1f8e4f8 JH |
2160 | #endif /*WITH_CONTENT_SCAN*/ |
2161 | /* | |
2162 | * vi: aw ai sw=2 | |
2163 | */ |