Commit | Line | Data |
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420a0d19 CE |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
2ea97746 CE |
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 |
6 | * License: GPL | |
7 | * Copyright (c) The Exim Maintainers 2015 - 2018 | |
8 | */ | |
420a0d19 CE |
9 | |
10 | /* Code for calling virus (malware) scanners. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
2ea97746 | 13 | #ifdef WITH_CONTENT_SCAN /* entire file */ |
420a0d19 | 14 | |
2ea97746 CE |
15 | typedef enum { |
16 | #ifndef DISABLE_MAL_FFROTD | |
17 | M_FPROTD, | |
18 | #endif | |
19 | #ifndef DISABLE_MAL_FFROT6D | |
20 | M_FPROT6D, | |
21 | #endif | |
22 | #ifndef DISABLE_MAL_DRWEB | |
23 | M_DRWEB, | |
24 | #endif | |
25 | #ifndef DISABLE_MAL_AVE | |
26 | M_AVES, | |
27 | #endif | |
28 | #ifndef DISABLE_MAL_FSECURE | |
29 | M_FSEC, | |
30 | #endif | |
31 | #ifndef DISABLE_MAL_KAV | |
32 | M_KAVD, | |
33 | #endif | |
34 | #ifndef DISABLE_MAL_SOPHIE | |
35 | M_SOPHIE, | |
36 | #endif | |
37 | #ifndef DISABLE_MAL_CLAM | |
38 | M_CLAMD, | |
39 | #endif | |
40 | #ifndef DISABLE_MAL_MKS | |
41 | M_MKSD, | |
42 | #endif | |
43 | #ifndef DISABLE_MAL_AVAST | |
44 | M_AVAST, | |
45 | #endif | |
46 | #ifndef DISABLE_MAL_SOCK | |
47 | M_SOCK, | |
48 | #endif | |
49 | #ifndef DISABLE_MAL_CMDLINE | |
50 | M_CMDL, | |
51 | #endif | |
52 | M_DUMMY | |
53 | } scanner_t; | |
420a0d19 CE |
54 | typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t; |
55 | static struct scan | |
56 | { | |
57 | scanner_t scancode; | |
58 | const uschar * name; | |
59 | const uschar * options_default; | |
60 | contype_t conn; | |
61 | } m_scans[] = | |
62 | { | |
2ea97746 | 63 | #ifndef DISABLE_MAL_FFROTD |
420a0d19 | 64 | { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP }, |
2ea97746 CE |
65 | #endif |
66 | #ifndef DISABLE_MAL_FFROT6D | |
67 | { M_FPROT6D, US"f-prot6d", US"localhost 10200", MC_TCP }, | |
68 | #endif | |
69 | #ifndef DISABLE_MAL_DRWEB | |
420a0d19 | 70 | { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM }, |
2ea97746 CE |
71 | #endif |
72 | #ifndef DISABLE_MAL_AVE | |
420a0d19 | 73 | { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX }, |
2ea97746 CE |
74 | #endif |
75 | #ifndef DISABLE_MAL_FSECURE | |
420a0d19 | 76 | { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX }, |
2ea97746 CE |
77 | #endif |
78 | #ifndef DISABLE_MAL_KAV | |
420a0d19 | 79 | { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX }, |
2ea97746 CE |
80 | #endif |
81 | #ifndef DISABLE_MAL_SOPHIE | |
420a0d19 | 82 | { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX }, |
2ea97746 CE |
83 | #endif |
84 | #ifndef DISABLE_MAL_CLAM | |
420a0d19 | 85 | { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE }, |
2ea97746 CE |
86 | #endif |
87 | #ifndef DISABLE_MAL_MKS | |
420a0d19 | 88 | { M_MKSD, US"mksd", NULL, MC_NONE }, |
2ea97746 CE |
89 | #endif |
90 | #ifndef DISABLE_MAL_AVAST | |
91 | { M_AVAST, US"avast", US"/var/run/avast/scan.sock", MC_STRM }, | |
92 | #endif | |
93 | #ifndef DISABLE_MAL_SOCK | |
94 | { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM }, | |
95 | #endif | |
96 | #ifndef DISABLE_MAL_CMDLINE | |
97 | { M_CMDL, US"cmdline", NULL, MC_NONE }, | |
98 | #endif | |
420a0d19 CE |
99 | { -1, NULL, NULL, MC_NONE } /* end-marker */ |
100 | }; | |
101 | ||
2ea97746 CE |
102 | /******************************************************************************/ |
103 | # ifdef MACRO_PREDEF /* build solely to predefine macros */ | |
104 | ||
105 | # include "macro_predef.h" | |
106 | ||
107 | void | |
108 | features_malware(void) | |
109 | { | |
110 | const struct scan * sc; | |
111 | const uschar * s; | |
112 | uschar * t; | |
113 | uschar buf[64]; | |
114 | ||
115 | spf(buf, sizeof(buf), US"_HAVE_MALWARE_"); | |
116 | ||
117 | for (sc = m_scans; sc->scancode != -1; sc++) | |
118 | { | |
119 | for(s = sc->name, t = buf+14; *s; s++) if (*s != '-') *t++ = toupper(*s); | |
120 | *t = '\0'; | |
121 | builtin_macro_create(buf); | |
122 | } | |
123 | } | |
124 | ||
125 | /******************************************************************************/ | |
126 | # else /*!MACRO_PREDEF, main build*/ | |
127 | ||
128 | ||
129 | #define MALWARE_TIMEOUT 120 /* default timeout, seconds */ | |
130 | ||
131 | static const uschar * malware_regex_default = US ".+"; | |
132 | static const pcre * malware_default_re = NULL; | |
133 | ||
134 | ||
135 | ||
136 | #ifndef DISABLE_MAL_CLAM | |
420a0d19 | 137 | /* The maximum number of clamd servers that are supported in the configuration */ |
2ea97746 CE |
138 | # define MAX_CLAMD_SERVERS 32 |
139 | # define MAX_CLAMD_SERVERS_S "32" | |
140 | ||
141 | typedef struct clamd_address { | |
142 | uschar * hostspec; | |
143 | unsigned tcp_port; | |
144 | unsigned retry; | |
145 | } clamd_address; | |
146 | #endif | |
147 | ||
148 | ||
149 | #ifndef DISABLE_MAL_DRWEB | |
150 | # define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ | |
151 | # define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
152 | # define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
153 | ||
154 | # define DERR_READ_ERR (1<<0) /* read error */ | |
155 | # define DERR_NOMEMORY (1<<2) /* no memory */ | |
156 | # define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
157 | # define DERR_BAD_CALL (1<<15) /* wrong command */ | |
158 | ||
159 | static const uschar * drweb_re_str = US "infected\\swith\\s*(.+?)$"; | |
160 | static const pcre * drweb_re = NULL; | |
161 | #endif | |
162 | ||
163 | #ifndef DISABLE_MAL_FSECURE | |
164 | static const uschar * fsec_re_str = US "\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$"; | |
165 | static const pcre * fsec_re = NULL; | |
420a0d19 CE |
166 | #endif |
167 | ||
2ea97746 CE |
168 | #ifndef DISABLE_MAL_KAV |
169 | static const uschar * kav_re_sus_str = US "suspicion:\\s*(.+?)\\s*$"; | |
170 | static const uschar * kav_re_inf_str = US "infected:\\s*(.+?)\\s*$"; | |
171 | static const pcre * kav_re_sus = NULL; | |
172 | static const pcre * kav_re_inf = NULL; | |
173 | #endif | |
174 | ||
175 | #ifndef DISABLE_MAL_AVAST | |
176 | static const uschar * ava_re_clean_str = US "(?!\\\\)\\t\\[\\+\\]"; | |
177 | static const uschar * ava_re_virus_str = US "(?!\\\\)\\t\\[L\\]\\d+\\.0\\t0\\s(.*)"; | |
178 | static const uschar * ava_re_error_str = US "(?!\\\\)\\t\\[E\\]\\d+\\.0\\tError\\s\\d+\\s(.*)"; | |
179 | static const pcre * ava_re_clean = NULL; | |
180 | static const pcre * ava_re_virus = NULL; | |
181 | static const pcre * ava_re_error = NULL; | |
182 | #endif | |
420a0d19 | 183 | |
2ea97746 CE |
184 | #ifndef DISABLE_MAL_FFROT6D |
185 | static const uschar * fprot6d_re_error_str = US "^\\d+\\s<(.+?)>$"; | |
186 | static const uschar * fprot6d_re_virus_str = US "^\\d+\\s<infected:\\s+(.+?)>\\s+.+$"; | |
187 | static const pcre * fprot6d_re_error = NULL; | |
188 | static const pcre * fprot6d_re_virus = NULL; | |
189 | #endif | |
420a0d19 CE |
190 | |
191 | ||
420a0d19 | 192 | |
2ea97746 | 193 | /******************************************************************************/ |
420a0d19 | 194 | |
2ea97746 | 195 | #ifndef DISABLE_MAL_KAV |
420a0d19 CE |
196 | /* Routine to check whether a system is big- or little-endian. |
197 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html | |
198 | Needed for proper kavdaemon implementation. Sigh. */ | |
2ea97746 CE |
199 | # define BIG_MY_ENDIAN 0 |
200 | # define LITTLE_MY_ENDIAN 1 | |
420a0d19 CE |
201 | static int test_byte_order(void); |
202 | static inline int | |
203 | test_byte_order() | |
204 | { | |
205 | short int word = 0x0001; | |
2ea97746 | 206 | char *byte = CS &word; |
420a0d19 CE |
207 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); |
208 | } | |
2ea97746 | 209 | #endif |
420a0d19 CE |
210 | |
211 | BOOL malware_ok = FALSE; | |
212 | ||
213 | /* Gross hacks for the -bmalware option; perhaps we should just create | |
214 | the scan directory normally for that case, but look into rigging up the | |
215 | needed header variables if not already set on the command-line? */ | |
216 | extern int spool_mbox_ok; | |
2ea97746 | 217 | extern uschar spooled_message_id[MESSAGE_ID_LENGTH+1]; |
420a0d19 | 218 | |
420a0d19 | 219 | |
2ea97746 CE |
220 | /* Some (currently avast only) use backslash escaped whitespace, |
221 | this function undoes these escapes */ | |
420a0d19 | 222 | |
2ea97746 CE |
223 | static inline void |
224 | unescape(uschar *p) | |
420a0d19 | 225 | { |
2ea97746 CE |
226 | uschar *p0; |
227 | for (; *p; ++p) | |
228 | if (*p == '\\' && (isspace(p[1]) || p[1] == '\\')) | |
229 | for (p0 = p; *p0; ++p0) *p0 = p0[1]; | |
420a0d19 CE |
230 | } |
231 | ||
2ea97746 CE |
232 | /* --- malware_*_defer --- */ |
233 | static inline int | |
234 | malware_panic_defer(const uschar * str) | |
420a0d19 | 235 | { |
2ea97746 CE |
236 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str); |
237 | return DEFER; | |
420a0d19 | 238 | } |
420a0d19 | 239 | static inline int |
2ea97746 | 240 | malware_log_defer(const uschar * str) |
420a0d19 | 241 | { |
2ea97746 CE |
242 | log_write(0, LOG_MAIN, "malware acl condition: %s", str); |
243 | return DEFER; | |
420a0d19 | 244 | } |
2ea97746 CE |
245 | /* --- m_*_defer --- */ |
246 | static inline int | |
247 | m_panic_defer(struct scan * scanent, const uschar * hostport, | |
248 | const uschar * str) | |
420a0d19 | 249 | { |
2ea97746 CE |
250 | return malware_panic_defer(string_sprintf("%s %s : %s", |
251 | scanent->name, hostport ? hostport : CUS"", str)); | |
420a0d19 | 252 | } |
2ea97746 CE |
253 | static inline int |
254 | m_log_defer(struct scan * scanent, const uschar * hostport, | |
255 | const uschar * str) | |
256 | { | |
257 | return malware_log_defer(string_sprintf("%s %s : %s", | |
258 | scanent->name, hostport ? hostport : CUS"", str)); | |
259 | } | |
260 | /* --- m_*_defer_3 */ | |
261 | static inline int | |
262 | m_panic_defer_3(struct scan * scanent, const uschar * hostport, | |
263 | const uschar * str, int fd_to_close) | |
420a0d19 | 264 | { |
2ea97746 CE |
265 | (void) close(fd_to_close); |
266 | return m_panic_defer(scanent, hostport, str); | |
420a0d19 CE |
267 | } |
268 | ||
269 | /*************************************************/ | |
270 | ||
2ea97746 | 271 | #ifndef DISABLE_MAL_CLAM |
420a0d19 CE |
272 | /* Only used by the Clamav code, which is working from a list of servers and |
273 | uses the returned in_addr to get a second connection to the same system. | |
274 | */ | |
275 | static inline int | |
276 | m_tcpsocket(const uschar * hostname, unsigned int port, | |
2ea97746 | 277 | host_item * host, uschar ** errstr, const blob * fastopen_blob) |
420a0d19 | 278 | { |
2ea97746 CE |
279 | return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, |
280 | host, errstr, fastopen_blob); | |
420a0d19 | 281 | } |
2ea97746 | 282 | #endif |
420a0d19 CE |
283 | |
284 | static int | |
2ea97746 | 285 | m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr) |
420a0d19 | 286 | { |
2ea97746 CE |
287 | if (send(sock, buf, cnt, 0) < 0) |
288 | { | |
289 | int err = errno; | |
290 | (void)close(sock); | |
291 | *errstr = string_sprintf("unable to send to socket (%s): %s", | |
292 | buf, strerror(err)); | |
293 | return -1; | |
420a0d19 | 294 | } |
2ea97746 CE |
295 | return sock; |
296 | } | |
420a0d19 | 297 | |
2ea97746 CE |
298 | static const pcre * |
299 | m_pcre_compile(const uschar * re, uschar ** errstr) | |
300 | { | |
301 | const uschar * rerror; | |
302 | int roffset; | |
303 | const pcre * cre; | |
304 | ||
305 | cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
306 | if (!cre) | |
307 | *errstr= string_sprintf("regular expression error in '%s': %s at offset %d", | |
308 | re, rerror, roffset); | |
309 | return cre; | |
420a0d19 CE |
310 | } |
311 | ||
2ea97746 CE |
312 | uschar * |
313 | m_pcre_exec(const pcre * cre, uschar * text) | |
420a0d19 | 314 | { |
2ea97746 CE |
315 | int ovector[10*3]; |
316 | int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0, | |
317 | ovector, nelem(ovector)); | |
318 | uschar * substr = NULL; | |
319 | if (i >= 2) /* Got it */ | |
320 | pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr); | |
321 | return substr; | |
322 | } | |
420a0d19 | 323 | |
2ea97746 CE |
324 | static const pcre * |
325 | m_pcre_nextinlist(const uschar ** list, int * sep, | |
326 | char * listerr, uschar ** errstr) | |
327 | { | |
328 | const uschar * list_ele; | |
329 | const pcre * cre = NULL; | |
330 | ||
331 | if (!(list_ele = string_nextinlist(list, sep, NULL, 0))) | |
332 | *errstr = US listerr; | |
333 | else | |
334 | { | |
335 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "RE: ", | |
336 | string_printing(list_ele)); | |
337 | cre = m_pcre_compile(CUS list_ele, errstr); | |
420a0d19 | 338 | } |
2ea97746 CE |
339 | return cre; |
340 | } | |
420a0d19 | 341 | |
2ea97746 CE |
342 | /* |
343 | Simple though inefficient wrapper for reading a line. Drop CRs and the | |
344 | trailing newline. Can return early on buffer full. Null-terminate. | |
345 | Apply initial timeout if no data ready. | |
346 | ||
347 | Return: number of chars - zero for an empty line | |
348 | -1 on EOF | |
349 | -2 on timeout or error | |
350 | */ | |
351 | static int | |
352 | recv_line(int fd, uschar * buffer, int bsize, int tmo) | |
353 | { | |
354 | uschar * p = buffer; | |
355 | ssize_t rcv; | |
356 | BOOL ok = FALSE; | |
357 | ||
358 | if (!fd_ready(fd, tmo-time(NULL))) | |
359 | return -2; | |
360 | ||
361 | /*XXX tmo handling assumes we always get a whole line */ | |
362 | /* read until \n */ | |
363 | errno = 0; | |
364 | while ((rcv = read(fd, p, 1)) > 0) | |
365 | { | |
366 | ok = TRUE; | |
367 | if (p-buffer > bsize-2) break; | |
368 | if (*p == '\n') break; | |
369 | if (*p != '\r') p++; | |
370 | } | |
371 | if (!ok) | |
372 | { | |
373 | DEBUG(D_acl) debug_printf_indent("Malware scan: read %s (%s)\n", | |
374 | rcv==0 ? "EOF" : "error", strerror(errno)); | |
375 | return rcv==0 ? -1 : -2; | |
376 | } | |
377 | *p = '\0'; | |
378 | ||
379 | DEBUG(D_acl) debug_printf_indent("Malware scan: read '%s'\n", buffer); | |
380 | return p - buffer; | |
420a0d19 CE |
381 | } |
382 | ||
2ea97746 CE |
383 | /* return TRUE iff size as requested */ |
384 | static BOOL | |
385 | recv_len(int sock, void * buf, int size, int tmo) | |
420a0d19 | 386 | { |
2ea97746 CE |
387 | return fd_ready(sock, tmo-time(NULL)) |
388 | ? recv(sock, buf, size, 0) == size | |
389 | : FALSE; | |
420a0d19 CE |
390 | } |
391 | ||
2ea97746 CE |
392 | |
393 | ||
394 | #ifndef DISABLE_MAL_MKS | |
395 | /* ============= private routines for the "mksd" scanner type ============== */ | |
396 | ||
397 | # include <sys/uio.h> | |
398 | ||
399 | static inline int | |
400 | mksd_writev (int sock, struct iovec * iov, int iovcnt) | |
420a0d19 | 401 | { |
2ea97746 CE |
402 | int i; |
403 | ||
404 | for (;;) | |
405 | { | |
406 | do | |
407 | i = writev (sock, iov, iovcnt); | |
408 | while (i < 0 && errno == EINTR); | |
409 | if (i <= 0) | |
410 | { | |
411 | (void) malware_panic_defer( | |
412 | US"unable to write to mksd UNIX socket (/var/run/mksd/socket)"); | |
420a0d19 CE |
413 | return -1; |
414 | } | |
2ea97746 CE |
415 | for (;;) /* check for short write */ |
416 | if (i >= iov->iov_len) | |
417 | { | |
418 | if (--iovcnt == 0) | |
419 | return 0; | |
420 | i -= iov->iov_len; | |
421 | iov++; | |
422 | } | |
423 | else | |
424 | { | |
425 | iov->iov_len -= i; | |
426 | iov->iov_base = CS iov->iov_base + i; | |
427 | break; | |
428 | } | |
429 | } | |
420a0d19 CE |
430 | } |
431 | ||
2ea97746 CE |
432 | static inline int |
433 | mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size, int tmo) | |
420a0d19 | 434 | { |
2ea97746 CE |
435 | client_conn_ctx cctx = {.sock = sock}; |
436 | int offset = 0; | |
437 | int i; | |
438 | ||
439 | do | |
440 | { | |
441 | i = ip_recv(&cctx, av_buffer+offset, av_buffer_size-offset, tmo-time(NULL)); | |
442 | if (i <= 0) | |
443 | { | |
444 | (void) malware_panic_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)"); | |
445 | return -1; | |
446 | } | |
447 | ||
448 | offset += i; | |
449 | /* offset == av_buffer_size -> buffer full */ | |
450 | if (offset == av_buffer_size) | |
451 | { | |
452 | (void) malware_panic_defer(US"malformed reply received from mksd"); | |
453 | return -1; | |
454 | } | |
455 | } while (av_buffer[offset-1] != '\n'); | |
456 | ||
457 | av_buffer[offset] = '\0'; | |
458 | return offset; | |
420a0d19 CE |
459 | } |
460 | ||
2ea97746 CE |
461 | static inline int |
462 | mksd_parse_line(struct scan * scanent, char * line) | |
420a0d19 | 463 | { |
2ea97746 CE |
464 | char *p; |
465 | ||
466 | switch (*line) | |
467 | { | |
468 | case 'O': /* OK */ | |
469 | return OK; | |
470 | ||
471 | case 'E': | |
472 | case 'A': /* ERR */ | |
473 | if ((p = strchr (line, '\n')) != NULL) | |
474 | *p = '\0'; | |
475 | return m_panic_defer(scanent, NULL, | |
476 | string_sprintf("scanner failed: %s", line)); | |
477 | ||
478 | default: /* VIR */ | |
479 | if ((p = strchr (line, '\n')) != NULL) | |
480 | { | |
481 | *p = '\0'; | |
482 | if ( p-line > 5 | |
483 | && line[3] == ' ' | |
484 | && (p = strchr(line+4, ' ')) != NULL | |
485 | && p-line > 4 | |
486 | ) | |
487 | { | |
488 | *p = '\0'; | |
489 | malware_name = string_copy(US line+4); | |
490 | return OK; | |
491 | } | |
492 | } | |
493 | return m_panic_defer(scanent, NULL, | |
494 | string_sprintf("malformed reply received: %s", line)); | |
495 | } | |
420a0d19 CE |
496 | } |
497 | ||
2ea97746 CE |
498 | static int |
499 | mksd_scan_packed(struct scan * scanent, int sock, const uschar * scan_filename, | |
500 | int tmo) | |
420a0d19 | 501 | { |
2ea97746 CE |
502 | struct iovec iov[3]; |
503 | const char *cmd = "MSQ\n"; | |
504 | uschar av_buffer[1024]; | |
505 | ||
506 | iov[0].iov_base = (void *) cmd; | |
507 | iov[0].iov_len = 3; | |
508 | iov[1].iov_base = (void *) scan_filename; | |
509 | iov[1].iov_len = Ustrlen(scan_filename); | |
510 | iov[2].iov_base = (void *) (cmd + 3); | |
511 | iov[2].iov_len = 1; | |
512 | ||
513 | if (mksd_writev (sock, iov, 3) < 0) | |
514 | return DEFER; | |
515 | ||
516 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer), tmo) < 0) | |
517 | return DEFER; | |
518 | ||
519 | return mksd_parse_line (scanent, CS av_buffer); | |
520 | } | |
521 | #endif /* MKSD */ | |
522 | ||
420a0d19 | 523 | |
2ea97746 CE |
524 | #ifndef DISABLE_MAL_CLAM |
525 | static int | |
526 | clamd_option(clamd_address * cd, const uschar * optstr, int * subsep) | |
527 | { | |
528 | uschar * s; | |
529 | ||
530 | cd->retry = 0; | |
531 | while ((s = string_nextinlist(&optstr, subsep, NULL, 0))) | |
532 | if (Ustrncmp(s, "retry=", 6) == 0) | |
533 | { | |
534 | int sec = readconf_readtime((s += 6), '\0', FALSE); | |
535 | if (sec < 0) | |
536 | return FAIL; | |
537 | cd->retry = sec; | |
538 | } | |
420a0d19 | 539 | else |
2ea97746 CE |
540 | return FAIL; |
541 | return OK; | |
420a0d19 | 542 | } |
2ea97746 CE |
543 | #endif |
544 | ||
545 | ||
420a0d19 CE |
546 | |
547 | /************************************************* | |
548 | * Scan content for malware * | |
549 | *************************************************/ | |
550 | ||
551 | /* This is an internal interface for scanning an email; the normal interface | |
552 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
553 | ||
554 | Arguments: | |
2ea97746 CE |
555 | malware_re match condition for "malware=" |
556 | scan_filename the file holding the email to be scanned, if we're faking | |
557 | this up for the -bmalware test, else NULL | |
558 | timeout if nonzero, non-default timeoutl | |
420a0d19 CE |
559 | |
560 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
561 | where true means malware was found (condition applies) | |
562 | */ | |
563 | static int | |
2ea97746 CE |
564 | malware_internal(const uschar * malware_re, const uschar * scan_filename, |
565 | int timeout) | |
420a0d19 | 566 | { |
2ea97746 CE |
567 | int sep = 0; |
568 | const uschar *av_scanner_work = av_scanner; | |
569 | uschar *scanner_name; | |
570 | unsigned long mbox_size; | |
571 | FILE *mbox_file; | |
572 | const pcre *re; | |
573 | uschar * errstr; | |
574 | struct scan * scanent; | |
575 | const uschar * scanner_options; | |
576 | client_conn_ctx malware_daemon_ctx = {.sock = -1}; | |
577 | time_t tmo; | |
578 | uschar * eml_filename, * eml_dir; | |
579 | ||
580 | if (!malware_re) | |
581 | return FAIL; /* empty means "don't match anything" */ | |
582 | ||
583 | /* Ensure the eml mbox file is spooled up */ | |
584 | ||
585 | if (!(mbox_file = spool_mbox(&mbox_size, scan_filename, &eml_filename))) | |
586 | return malware_panic_defer(US"error while creating mbox spool file"); | |
587 | ||
588 | /* None of our current scanners need the mbox file as a stream (they use | |
589 | the name), so we can close it right away. Get the directory too. */ | |
590 | ||
591 | (void) fclose(mbox_file); | |
592 | eml_dir = string_copyn(eml_filename, Ustrrchr(eml_filename, '/') - eml_filename); | |
593 | ||
594 | /* parse 1st option */ | |
595 | if (strcmpic(malware_re, US"false") == 0 || Ustrcmp(malware_re,"0") == 0) | |
596 | return FAIL; /* explicitly no matching */ | |
597 | ||
598 | /* special cases (match anything except empty) */ | |
599 | if ( strcmpic(malware_re,US"true") == 0 | |
600 | || Ustrcmp(malware_re,"*") == 0 | |
601 | || Ustrcmp(malware_re,"1") == 0 | |
602 | ) | |
603 | { | |
604 | if ( !malware_default_re | |
605 | && !(malware_default_re = m_pcre_compile(malware_regex_default, &errstr))) | |
606 | return malware_panic_defer(errstr); | |
607 | malware_re = malware_regex_default; | |
608 | re = malware_default_re; | |
420a0d19 CE |
609 | } |
610 | ||
2ea97746 CE |
611 | /* compile the regex, see if it works */ |
612 | else if (!(re = m_pcre_compile(malware_re, &errstr))) | |
613 | return malware_panic_defer(errstr); | |
614 | ||
615 | /* if av_scanner starts with a dollar, expand it first */ | |
616 | if (*av_scanner == '$') | |
617 | { | |
618 | if (!(av_scanner_work = expand_string(av_scanner))) | |
619 | return malware_panic_defer( | |
620 | string_sprintf("av_scanner starts with $, but expansion failed: %s", | |
621 | expand_string_message)); | |
622 | ||
623 | DEBUG(D_acl) | |
624 | debug_printf_indent("Expanded av_scanner global: %s\n", av_scanner_work); | |
625 | /* disable result caching in this case */ | |
626 | malware_name = NULL; | |
627 | malware_ok = FALSE; | |
628 | } | |
629 | ||
630 | /* Do not scan twice (unless av_scanner is dynamic). */ | |
631 | if (!malware_ok) | |
632 | { | |
633 | /* find the scanner type from the av_scanner option */ | |
634 | if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
635 | return malware_panic_defer(US"av_scanner configuration variable is empty"); | |
636 | if (!timeout) timeout = MALWARE_TIMEOUT; | |
637 | tmo = time(NULL) + timeout; | |
638 | ||
639 | for (scanent = m_scans; ; scanent++) | |
640 | { | |
641 | if (!scanent->name) | |
642 | return malware_panic_defer(string_sprintf("unknown scanner type '%s'", | |
643 | scanner_name)); | |
644 | if (strcmpic(scanner_name, US scanent->name) != 0) | |
645 | continue; | |
646 | DEBUG(D_acl) debug_printf_indent("Malware scan: %s tmo=%s\n", | |
647 | scanner_name, readconf_printtime(timeout)); | |
648 | ||
649 | if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
650 | scanner_options = scanent->options_default; | |
651 | if (scanent->conn == MC_NONE) | |
420a0d19 | 652 | break; |
2ea97746 CE |
653 | |
654 | DEBUG(D_acl) debug_printf_indent("%15s%10s%s\n", "", "socket: ", scanner_options); | |
655 | switch(scanent->conn) | |
656 | { | |
657 | case MC_TCP: | |
658 | malware_daemon_ctx.sock = ip_tcpsocket(scanner_options, &errstr, 5); break; | |
659 | case MC_UNIX: | |
660 | malware_daemon_ctx.sock = ip_unixsocket(scanner_options, &errstr); break; | |
661 | case MC_STRM: | |
662 | malware_daemon_ctx.sock = ip_streamsocket(scanner_options, &errstr, 5); break; | |
663 | default: | |
664 | /* compiler quietening */ break; | |
420a0d19 | 665 | } |
2ea97746 CE |
666 | if (malware_daemon_ctx.sock < 0) |
667 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
668 | break; | |
669 | } | |
420a0d19 | 670 | |
2ea97746 CE |
671 | switch (scanent->scancode) |
672 | { | |
673 | #ifndef DISABLE_MAL_FFROTD | |
420a0d19 CE |
674 | case M_FPROTD: /* "f-protd" scanner type -------------------------------- */ |
675 | { | |
2ea97746 CE |
676 | uschar *fp_scan_option; |
677 | unsigned int detected=0, par_count=0; | |
678 | uschar * scanrequest; | |
679 | uschar buf[32768], *strhelper, *strhelper2; | |
680 | uschar * malware_name_internal = NULL; | |
681 | int len; | |
682 | ||
683 | scanrequest = string_sprintf("GET %s", eml_filename); | |
684 | ||
685 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, | |
686 | NULL, 0))) | |
687 | { | |
688 | scanrequest = string_sprintf("%s%s%s", scanrequest, | |
689 | par_count ? "%20" : "?", fp_scan_option); | |
690 | par_count++; | |
420a0d19 | 691 | } |
2ea97746 CE |
692 | scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest); |
693 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n", | |
694 | scanner_name, scanrequest); | |
420a0d19 | 695 | |
2ea97746 CE |
696 | /* send scan request */ |
697 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
698 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
699 | ||
700 | while ((len = recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo)) >= 0) | |
701 | if (len > 0) | |
702 | { | |
703 | if (Ustrstr(buf, US"<detected type=\"") != NULL) | |
704 | detected = 1; | |
705 | else if (detected && (strhelper = Ustrstr(buf, US"<name>"))) | |
706 | { | |
707 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) | |
708 | { | |
709 | *strhelper2 = '\0'; | |
710 | malware_name_internal = string_copy(strhelper+6); | |
420a0d19 | 711 | } |
2ea97746 CE |
712 | } |
713 | else if (Ustrstr(buf, US"<summary code=\"")) | |
714 | { | |
715 | malware_name = Ustrstr(buf, US"<summary code=\"11\">") | |
716 | ? malware_name_internal : NULL; | |
717 | break; | |
718 | } | |
420a0d19 | 719 | } |
2ea97746 CE |
720 | if (len < -1) |
721 | { | |
722 | (void)close(malware_daemon_ctx.sock); | |
723 | return DEFER; | |
420a0d19 | 724 | } |
2ea97746 | 725 | break; |
420a0d19 | 726 | } /* f-protd */ |
2ea97746 CE |
727 | #endif |
728 | ||
729 | #ifndef DISABLE_MAL_FFROT6D | |
730 | case M_FPROT6D: /* "f-prot6d" scanner type ----------------------------------- */ | |
731 | { | |
732 | int bread; | |
733 | uschar * e; | |
734 | uschar * linebuffer; | |
735 | uschar * scanrequest; | |
736 | uschar av_buffer[1024]; | |
737 | ||
738 | if ((!fprot6d_re_virus && !(fprot6d_re_virus = m_pcre_compile(fprot6d_re_virus_str, &errstr))) | |
739 | || (!fprot6d_re_error && !(fprot6d_re_error = m_pcre_compile(fprot6d_re_error_str, &errstr)))) | |
740 | return malware_panic_defer(errstr); | |
741 | ||
742 | scanrequest = string_sprintf("SCAN FILE %s\n", eml_filename); | |
743 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n", | |
744 | scanner_name, scanrequest); | |
745 | ||
746 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest), &errstr) < 0) | |
747 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
748 | ||
749 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
750 | ||
751 | if (bread <= 0) | |
752 | return m_panic_defer_3(scanent, CUS callout_address, | |
753 | string_sprintf("unable to read from socket (%s)", strerror(errno)), | |
754 | malware_daemon_ctx.sock); | |
755 | ||
756 | if (bread == sizeof(av_buffer)) | |
757 | return m_panic_defer_3(scanent, CUS callout_address, | |
758 | US"buffer too small", malware_daemon_ctx.sock); | |
759 | ||
760 | av_buffer[bread] = '\0'; | |
761 | linebuffer = string_copy(av_buffer); | |
762 | ||
763 | m_sock_send(malware_daemon_ctx.sock, US"QUIT\n", 5, 0); | |
764 | ||
765 | if ((e = m_pcre_exec(fprot6d_re_error, linebuffer))) | |
766 | return m_panic_defer_3(scanent, CUS callout_address, | |
767 | string_sprintf("scanner reported error (%s)", e), malware_daemon_ctx.sock); | |
768 | ||
769 | if (!(malware_name = m_pcre_exec(fprot6d_re_virus, linebuffer))) | |
770 | malware_name = NULL; | |
771 | ||
772 | break; | |
773 | } /* f-prot6d */ | |
774 | #endif | |
420a0d19 | 775 | |
2ea97746 | 776 | #ifndef DISABLE_MAL_DRWEB |
420a0d19 | 777 | case M_DRWEB: /* "drweb" scanner type ----------------------------------- */ |
2ea97746 CE |
778 | /* v0.1 - added support for tcp sockets */ |
779 | /* v0.0 - initial release -- support for unix sockets */ | |
420a0d19 | 780 | { |
2ea97746 CE |
781 | int result; |
782 | off_t fsize; | |
783 | unsigned int fsize_uint; | |
784 | uschar * tmpbuf, *drweb_fbuf; | |
785 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
786 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
787 | ||
788 | /* prepare variables */ | |
789 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
790 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
791 | ||
792 | if (*scanner_options != '/') | |
793 | { | |
794 | /* calc file size */ | |
795 | if ((drweb_fd = open(CCS eml_filename, O_RDONLY)) == -1) | |
796 | return m_panic_defer_3(scanent, NULL, | |
797 | string_sprintf("can't open spool file %s: %s", | |
798 | eml_filename, strerror(errno)), | |
799 | malware_daemon_ctx.sock); | |
800 | ||
801 | if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) | |
802 | { | |
803 | int err; | |
804 | badseek: err = errno; | |
805 | (void)close(drweb_fd); | |
806 | return m_panic_defer_3(scanent, NULL, | |
807 | string_sprintf("can't seek spool file %s: %s", | |
808 | eml_filename, strerror(err)), | |
809 | malware_daemon_ctx.sock); | |
420a0d19 | 810 | } |
2ea97746 CE |
811 | fsize_uint = (unsigned int) fsize; |
812 | if ((off_t)fsize_uint != fsize) | |
813 | { | |
814 | (void)close(drweb_fd); | |
815 | return m_panic_defer_3(scanent, NULL, | |
816 | string_sprintf("seeking spool file %s, size overflow", | |
817 | eml_filename), | |
818 | malware_daemon_ctx.sock); | |
420a0d19 | 819 | } |
2ea97746 CE |
820 | drweb_slen = htonl(fsize); |
821 | if (lseek(drweb_fd, 0, SEEK_SET) < 0) | |
822 | goto badseek; | |
420a0d19 | 823 | |
2ea97746 CE |
824 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s remote scan [%s]\n", |
825 | scanner_name, scanner_options); | |
420a0d19 | 826 | |
2ea97746 CE |
827 | /* send scan request */ |
828 | if ((send(malware_daemon_ctx.sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
829 | (send(malware_daemon_ctx.sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
830 | (send(malware_daemon_ctx.sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
831 | (send(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) | |
832 | { | |
420a0d19 | 833 | (void)close(drweb_fd); |
2ea97746 CE |
834 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
835 | "unable to send commands to socket (%s)", scanner_options), | |
836 | malware_daemon_ctx.sock); | |
420a0d19 | 837 | } |
2ea97746 CE |
838 | |
839 | if (!(drweb_fbuf = US malloc(fsize_uint))) | |
840 | { | |
420a0d19 | 841 | (void)close(drweb_fd); |
2ea97746 CE |
842 | return m_panic_defer_3(scanent, NULL, |
843 | string_sprintf("unable to allocate memory %u for file (%s)", | |
844 | fsize_uint, eml_filename), | |
845 | malware_daemon_ctx.sock); | |
846 | } | |
420a0d19 | 847 | |
2ea97746 CE |
848 | if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) |
849 | { | |
850 | int err = errno; | |
851 | (void)close(drweb_fd); | |
852 | free(drweb_fbuf); | |
853 | return m_panic_defer_3(scanent, NULL, | |
854 | string_sprintf("can't read spool file %s: %s", | |
855 | eml_filename, strerror(err)), | |
856 | malware_daemon_ctx.sock); | |
857 | } | |
858 | (void)close(drweb_fd); | |
420a0d19 | 859 | |
2ea97746 CE |
860 | /* send file body to socket */ |
861 | if (send(malware_daemon_ctx.sock, drweb_fbuf, fsize, 0) < 0) | |
862 | { | |
863 | free(drweb_fbuf); | |
864 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( | |
865 | "unable to send file body to socket (%s)", scanner_options), | |
866 | malware_daemon_ctx.sock); | |
867 | } | |
868 | } | |
869 | else | |
870 | { | |
871 | drweb_slen = htonl(Ustrlen(eml_filename)); | |
420a0d19 | 872 | |
2ea97746 CE |
873 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s local scan [%s]\n", |
874 | scanner_name, scanner_options); | |
420a0d19 | 875 | |
2ea97746 CE |
876 | /* send scan request */ |
877 | if ((send(malware_daemon_ctx.sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || | |
878 | (send(malware_daemon_ctx.sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
879 | (send(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
880 | (send(malware_daemon_ctx.sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || | |
881 | (send(malware_daemon_ctx.sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) | |
882 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( | |
883 | "unable to send commands to socket (%s)", scanner_options), | |
884 | malware_daemon_ctx.sock); | |
420a0d19 CE |
885 | } |
886 | ||
2ea97746 CE |
887 | /* wait for result */ |
888 | if (!recv_len(malware_daemon_ctx.sock, &drweb_rc, sizeof(drweb_rc), tmo)) | |
889 | return m_panic_defer_3(scanent, CUS callout_address, | |
890 | US"unable to read return code", malware_daemon_ctx.sock); | |
891 | drweb_rc = ntohl(drweb_rc); | |
420a0d19 | 892 | |
2ea97746 CE |
893 | if (!recv_len(malware_daemon_ctx.sock, &drweb_vnum, sizeof(drweb_vnum), tmo)) |
894 | return m_panic_defer_3(scanent, CUS callout_address, | |
895 | US"unable to read the number of viruses", malware_daemon_ctx.sock); | |
896 | drweb_vnum = ntohl(drweb_vnum); | |
420a0d19 | 897 | |
2ea97746 CE |
898 | /* "virus(es) found" if virus number is > 0 */ |
899 | if (drweb_vnum) | |
900 | { | |
901 | int i; | |
902 | gstring * g = NULL; | |
420a0d19 | 903 | |
2ea97746 CE |
904 | /* setup default virus name */ |
905 | malware_name = US"unknown"; | |
420a0d19 | 906 | |
2ea97746 CE |
907 | /* set up match regex */ |
908 | if (!drweb_re) | |
909 | drweb_re = m_pcre_compile(drweb_re_str, &errstr); | |
420a0d19 | 910 | |
2ea97746 CE |
911 | /* read and concatenate virus names into one string */ |
912 | for (i = 0; i < drweb_vnum; i++) | |
420a0d19 | 913 | { |
2ea97746 CE |
914 | int ovector[10*3]; |
915 | ||
916 | /* read the size of report */ | |
917 | if (!recv_len(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), tmo)) | |
918 | return m_panic_defer_3(scanent, CUS callout_address, | |
919 | US"cannot read report size", malware_daemon_ctx.sock); | |
920 | drweb_slen = ntohl(drweb_slen); | |
921 | tmpbuf = store_get(drweb_slen); | |
922 | ||
923 | /* read report body */ | |
924 | if (!recv_len(malware_daemon_ctx.sock, tmpbuf, drweb_slen, tmo)) | |
925 | return m_panic_defer_3(scanent, CUS callout_address, | |
926 | US"cannot read report string", malware_daemon_ctx.sock); | |
927 | tmpbuf[drweb_slen] = '\0'; | |
928 | ||
929 | /* try matcher on the line, grab substring */ | |
930 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, | |
931 | ovector, nelem(ovector)); | |
932 | if (result >= 2) | |
933 | { | |
934 | const char * pre_malware_nb; | |
935 | ||
936 | pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb); | |
937 | ||
938 | if (i==0) /* the first name we just copy to malware_name */ | |
939 | g = string_cat(NULL, US pre_malware_nb); | |
940 | ||
941 | /*XXX could be string_append_listele? */ | |
942 | else /* concatenate each new virus name to previous */ | |
943 | g = string_append(g, 2, "/", pre_malware_nb); | |
944 | ||
945 | pcre_free_substring(pre_malware_nb); | |
420a0d19 CE |
946 | } |
947 | } | |
2ea97746 | 948 | malware_name = string_from_gstring(g); |
420a0d19 | 949 | } |
2ea97746 CE |
950 | else |
951 | { | |
952 | const char *drweb_s = NULL; | |
953 | ||
954 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
955 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
956 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
957 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
958 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
959 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
960 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
961 | * and others are ignored */ | |
962 | if (drweb_s) | |
963 | return m_panic_defer_3(scanent, CUS callout_address, | |
964 | string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s), | |
965 | malware_daemon_ctx.sock); | |
966 | ||
967 | /* no virus found */ | |
968 | malware_name = NULL; | |
420a0d19 | 969 | } |
2ea97746 | 970 | break; |
420a0d19 | 971 | } /* drweb */ |
2ea97746 | 972 | #endif |
420a0d19 | 973 | |
2ea97746 | 974 | #ifndef DISABLE_MAL_AVE |
420a0d19 CE |
975 | case M_AVES: /* "aveserver" scanner type -------------------------------- */ |
976 | { | |
2ea97746 CE |
977 | uschar buf[32768]; |
978 | int result; | |
979 | ||
980 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ | |
981 | buf[0] = 0; | |
982 | recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo); | |
983 | ||
984 | if (buf[0] != '2') /* aveserver is having problems */ | |
985 | return m_panic_defer_3(scanent, CUS callout_address, | |
986 | string_sprintf("unavailable (Responded: %s).", | |
987 | ((buf[0] != 0) ? buf : US "nothing") ), | |
988 | malware_daemon_ctx.sock); | |
989 | ||
990 | /* prepare our command */ | |
991 | (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n", | |
992 | eml_filename); | |
993 | ||
994 | /* and send it */ | |
995 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s %s\n", | |
996 | scanner_name, buf); | |
997 | if (m_sock_send(malware_daemon_ctx.sock, buf, Ustrlen(buf), &errstr) < 0) | |
998 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
999 | ||
1000 | malware_name = NULL; | |
1001 | result = 0; | |
1002 | /* read response lines, find malware name and final response */ | |
1003 | while (recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo) > 0) | |
1004 | { | |
1005 | if (buf[0] == '2') | |
1006 | break; | |
1007 | if (buf[0] == '5') /* aveserver is having problems */ | |
1008 | { | |
1009 | result = m_panic_defer(scanent, CUS callout_address, | |
1010 | string_sprintf("unable to scan file %s (Responded: %s).", | |
1011 | eml_filename, buf)); | |
1012 | break; | |
1013 | } | |
1014 | if (Ustrncmp(buf,"322",3) == 0) | |
1015 | { | |
1016 | uschar *p = Ustrchr(&buf[4], ' '); | |
1017 | *p = '\0'; | |
1018 | malware_name = string_copy(&buf[4]); | |
1019 | } | |
1020 | } | |
420a0d19 | 1021 | |
2ea97746 CE |
1022 | if (m_sock_send(malware_daemon_ctx.sock, US"quit\r\n", 6, &errstr) < 0) |
1023 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
420a0d19 | 1024 | |
2ea97746 CE |
1025 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
1026 | buf[0] = 0; | |
1027 | recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo); | |
420a0d19 | 1028 | |
2ea97746 CE |
1029 | if (buf[0] != '2') /* aveserver is having problems */ |
1030 | return m_panic_defer_3(scanent, CUS callout_address, | |
1031 | string_sprintf("unable to quit dialogue (Responded: %s).", | |
1032 | ((buf[0] != 0) ? buf : US "nothing") ), | |
1033 | malware_daemon_ctx.sock); | |
420a0d19 | 1034 | |
2ea97746 CE |
1035 | if (result == DEFER) |
1036 | { | |
1037 | (void)close(malware_daemon_ctx.sock); | |
1038 | return DEFER; | |
420a0d19 | 1039 | } |
2ea97746 CE |
1040 | break; |
1041 | } /* aveserver */ | |
1042 | #endif | |
420a0d19 | 1043 | |
2ea97746 CE |
1044 | #ifndef DISABLE_MAL_FSECURE |
1045 | case M_FSEC: /* "fsecure" scanner type ---------------------------------- */ | |
1046 | { | |
1047 | int i, j, bread = 0; | |
1048 | uschar * file_name; | |
1049 | uschar av_buffer[1024]; | |
1050 | static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n", | |
1051 | US"CONFIGURE\tTIMEOUT\t0\n", | |
1052 | US"CONFIGURE\tMAXARCH\t5\n", | |
1053 | US"CONFIGURE\tMIME\t1\n" }; | |
1054 | ||
1055 | malware_name = NULL; | |
1056 | ||
1057 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", | |
1058 | scanner_name, scanner_options); | |
1059 | /* pass options */ | |
1060 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1061 | for (i = 0; i != nelem(cmdopt); i++) | |
1062 | { | |
420a0d19 | 1063 | |
2ea97746 CE |
1064 | if (m_sock_send(malware_daemon_ctx.sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0) |
1065 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
1066 | ||
1067 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
1068 | if (bread > 0) av_buffer[bread]='\0'; | |
1069 | if (bread < 0) | |
1070 | return m_panic_defer_3(scanent, CUS callout_address, | |
1071 | string_sprintf("unable to read answer %d (%s)", i, strerror(errno)), | |
1072 | malware_daemon_ctx.sock); | |
1073 | for (j = 0; j < bread; j++) | |
1074 | if (av_buffer[j] == '\r' || av_buffer[j] == '\n') | |
1075 | av_buffer[j] ='@'; | |
1076 | } | |
420a0d19 | 1077 | |
2ea97746 CE |
1078 | /* pass the mailfile to fsecure */ |
1079 | file_name = string_sprintf("SCAN\t%s\n", eml_filename); | |
420a0d19 | 1080 | |
2ea97746 CE |
1081 | if (m_sock_send(malware_daemon_ctx.sock, file_name, Ustrlen(file_name), &errstr) < 0) |
1082 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
420a0d19 | 1083 | |
2ea97746 CE |
1084 | /* set up match */ |
1085 | /* todo also SUSPICION\t */ | |
1086 | if (!fsec_re) | |
1087 | fsec_re = m_pcre_compile(fsec_re_str, &errstr); | |
420a0d19 | 1088 | |
2ea97746 CE |
1089 | /* read report, linewise. Apply a timeout as the Fsecure daemon |
1090 | sometimes wants an answer to "PING" but they won't tell us what */ | |
1091 | { | |
1092 | uschar * p = av_buffer; | |
1093 | uschar * q; | |
420a0d19 | 1094 | |
2ea97746 CE |
1095 | for (;;) |
1096 | { | |
1097 | errno = ETIMEDOUT; | |
1098 | i = av_buffer+sizeof(av_buffer)-p; | |
1099 | if ((bread= ip_recv(&malware_daemon_ctx, p, i-1, tmo-time(NULL))) < 0) | |
1100 | return m_panic_defer_3(scanent, CUS callout_address, | |
1101 | string_sprintf("unable to read result (%s)", strerror(errno)), | |
1102 | malware_daemon_ctx.sock); | |
1103 | ||
1104 | for (p[bread] = '\0'; (q = Ustrchr(p, '\n')); p = q+1) | |
1105 | { | |
1106 | *q = '\0'; | |
420a0d19 | 1107 | |
2ea97746 CE |
1108 | /* Really search for virus again? */ |
1109 | if (!malware_name) | |
1110 | /* try matcher on the line, grab substring */ | |
1111 | malware_name = m_pcre_exec(fsec_re, p); | |
1112 | ||
1113 | if (Ustrstr(p, "OK\tScan ok.")) | |
1114 | goto fsec_found; | |
1115 | } | |
420a0d19 | 1116 | |
2ea97746 CE |
1117 | /* copy down the trailing partial line then read another chunk */ |
1118 | i = av_buffer+sizeof(av_buffer)-p; | |
1119 | memmove(av_buffer, p, i); | |
1120 | p = av_buffer+i; | |
1121 | } | |
420a0d19 | 1122 | } |
2ea97746 CE |
1123 | |
1124 | fsec_found: | |
420a0d19 CE |
1125 | break; |
1126 | } /* fsecure */ | |
2ea97746 | 1127 | #endif |
420a0d19 | 1128 | |
2ea97746 | 1129 | #ifndef DISABLE_MAL_KAV |
420a0d19 CE |
1130 | case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */ |
1131 | { | |
2ea97746 CE |
1132 | time_t t; |
1133 | uschar tmpbuf[1024]; | |
1134 | uschar * scanrequest; | |
1135 | int kav_rc; | |
1136 | unsigned long kav_reportlen; | |
1137 | int bread; | |
1138 | const pcre *kav_re; | |
1139 | uschar *p; | |
1140 | ||
1141 | /* get current date and time, build scan request */ | |
1142 | time(&t); | |
1143 | /* pdp note: before the eml_filename parameter, this scanned the | |
1144 | directory; not finding documentation, so we'll strip off the directory. | |
1145 | The side-effect is that the test framework scanning may end up in | |
1146 | scanning more than was requested, but for the normal interface, this is | |
1147 | fine. */ | |
1148 | ||
1149 | strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t)); | |
1150 | scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename); | |
1151 | p = Ustrrchr(scanrequest, '/'); | |
1152 | if (p) | |
1153 | *p = '\0'; | |
1154 | ||
1155 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", | |
1156 | scanner_name, scanner_options); | |
1157 | ||
1158 | /* send scan request */ | |
1159 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) | |
1160 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
1161 | ||
1162 | /* wait for result */ | |
1163 | if (!recv_len(malware_daemon_ctx.sock, tmpbuf, 2, tmo)) | |
1164 | return m_panic_defer_3(scanent, CUS callout_address, | |
1165 | US"unable to read 2 bytes from socket.", malware_daemon_ctx.sock); | |
1166 | ||
1167 | /* get errorcode from one nibble */ | |
1168 | kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F; | |
1169 | switch(kav_rc) | |
1170 | { | |
1171 | case 5: case 6: /* improper kavdaemon configuration */ | |
1172 | return m_panic_defer_3(scanent, CUS callout_address, | |
1173 | US"please reconfigure kavdaemon to NOT disinfect or remove infected files.", | |
1174 | malware_daemon_ctx.sock); | |
1175 | case 1: | |
1176 | return m_panic_defer_3(scanent, CUS callout_address, | |
1177 | US"reported 'scanning not completed' (code 1).", malware_daemon_ctx.sock); | |
1178 | case 7: | |
1179 | return m_panic_defer_3(scanent, CUS callout_address, | |
1180 | US"reported 'kavdaemon damaged' (code 7).", malware_daemon_ctx.sock); | |
1181 | } | |
420a0d19 | 1182 | |
2ea97746 CE |
1183 | /* code 8 is not handled, since it is ambiguous. It appears mostly on |
1184 | bounces where part of a file has been cut off */ | |
420a0d19 | 1185 | |
2ea97746 CE |
1186 | /* "virus found" return codes (2-4) */ |
1187 | if (kav_rc > 1 && kav_rc < 5) | |
1188 | { | |
1189 | int report_flag = 0; | |
420a0d19 | 1190 | |
2ea97746 CE |
1191 | /* setup default virus name */ |
1192 | malware_name = US"unknown"; | |
420a0d19 | 1193 | |
2ea97746 | 1194 | report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ]; |
420a0d19 | 1195 | |
2ea97746 CE |
1196 | /* read the report, if available */ |
1197 | if (report_flag == 1) | |
1198 | { | |
1199 | /* read report size */ | |
1200 | if (!recv_len(malware_daemon_ctx.sock, &kav_reportlen, 4, tmo)) | |
1201 | return m_panic_defer_3(scanent, CUS callout_address, | |
1202 | US"cannot read report size", malware_daemon_ctx.sock); | |
1203 | ||
1204 | /* it's possible that avp returns av_buffer[1] == 1 but the | |
1205 | reportsize is 0 (!?) */ | |
1206 | if (kav_reportlen > 0) | |
1207 | { | |
1208 | /* set up match regex, depends on retcode */ | |
1209 | if (kav_rc == 3) | |
1210 | { | |
1211 | if (!kav_re_sus) kav_re_sus = m_pcre_compile(kav_re_sus_str, &errstr); | |
1212 | kav_re = kav_re_sus; | |
1213 | } | |
1214 | else | |
1215 | { | |
1216 | if (!kav_re_inf) kav_re_inf = m_pcre_compile(kav_re_inf_str, &errstr); | |
1217 | kav_re = kav_re_inf; | |
1218 | } | |
420a0d19 | 1219 | |
2ea97746 CE |
1220 | /* read report, linewise. Using size from stream to read amount of data |
1221 | from same stream is safe enough. */ | |
1222 | /* coverity[tainted_data] */ | |
1223 | while (kav_reportlen > 0) | |
1224 | { | |
1225 | if ((bread = recv_line(malware_daemon_ctx.sock, tmpbuf, sizeof(tmpbuf), tmo)) < 0) | |
1226 | break; | |
1227 | kav_reportlen -= bread+1; | |
1228 | ||
1229 | /* try matcher on the line, grab substring */ | |
1230 | if ((malware_name = m_pcre_exec(kav_re, tmpbuf))) | |
1231 | break; | |
420a0d19 CE |
1232 | } |
1233 | } | |
1234 | } | |
1235 | } | |
2ea97746 CE |
1236 | else /* no virus found */ |
1237 | malware_name = NULL; | |
420a0d19 | 1238 | |
2ea97746 | 1239 | break; |
420a0d19 | 1240 | } |
2ea97746 | 1241 | #endif |
420a0d19 | 1242 | |
2ea97746 | 1243 | #ifndef DISABLE_MAL_CMDLINE |
420a0d19 CE |
1244 | case M_CMDL: /* "cmdline" scanner type ---------------------------------- */ |
1245 | { | |
2ea97746 CE |
1246 | const uschar *cmdline_scanner = scanner_options; |
1247 | const pcre *cmdline_trigger_re; | |
1248 | const pcre *cmdline_regex_re; | |
1249 | uschar * file_name; | |
1250 | uschar * commandline; | |
1251 | void (*eximsigchld)(int); | |
1252 | void (*eximsigpipe)(int); | |
1253 | FILE *scanner_out = NULL; | |
1254 | int scanner_fd; | |
1255 | FILE *scanner_record = NULL; | |
1256 | uschar linebuffer[32767]; | |
1257 | int rcnt; | |
1258 | int trigger = 0; | |
1259 | uschar *p; | |
1260 | ||
1261 | if (!cmdline_scanner) | |
1262 | return m_panic_defer(scanent, NULL, errstr); | |
1263 | ||
1264 | /* find scanner output trigger */ | |
1265 | cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1266 | "missing trigger specification", &errstr); | |
1267 | if (!cmdline_trigger_re) | |
1268 | return m_panic_defer(scanent, NULL, errstr); | |
1269 | ||
1270 | /* find scanner name regex */ | |
1271 | cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1272 | "missing virus name regex specification", &errstr); | |
1273 | if (!cmdline_regex_re) | |
1274 | return m_panic_defer(scanent, NULL, errstr); | |
1275 | ||
1276 | /* prepare scanner call; despite the naming, file_name holds a directory | |
1277 | name which is documented as the value given to %s. */ | |
1278 | ||
1279 | file_name = string_copy(eml_filename); | |
1280 | p = Ustrrchr(file_name, '/'); | |
1281 | if (p) | |
1282 | *p = '\0'; | |
1283 | commandline = string_sprintf(CS cmdline_scanner, file_name); | |
1284 | ||
1285 | /* redirect STDERR too */ | |
1286 | commandline = string_sprintf("%s 2>&1", commandline); | |
1287 | ||
1288 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", | |
1289 | scanner_name, commandline); | |
1290 | ||
1291 | /* store exims signal handlers */ | |
1292 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1293 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
1294 | ||
1295 | if (!(scanner_out = popen(CS commandline,"r"))) | |
1296 | { | |
1297 | int err = errno; | |
1298 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1299 | return m_panic_defer(scanent, NULL, | |
1300 | string_sprintf("call (%s) failed: %s.", commandline, strerror(err))); | |
1301 | } | |
1302 | scanner_fd = fileno(scanner_out); | |
420a0d19 | 1303 | |
2ea97746 | 1304 | file_name = string_sprintf("%s/%s_scanner_output", eml_dir, message_id); |
420a0d19 | 1305 | |
2ea97746 CE |
1306 | if (!(scanner_record = modefopen(file_name, "wb", SPOOL_MODE))) |
1307 | { | |
1308 | int err = errno; | |
1309 | (void) pclose(scanner_out); | |
1310 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1311 | return m_panic_defer(scanent, NULL, string_sprintf( | |
1312 | "opening scanner output file (%s) failed: %s.", | |
1313 | file_name, strerror(err))); | |
420a0d19 CE |
1314 | } |
1315 | ||
2ea97746 CE |
1316 | /* look for trigger while recording output */ |
1317 | while ((rcnt = recv_line(scanner_fd, linebuffer, | |
1318 | sizeof(linebuffer), tmo))) | |
1319 | { | |
1320 | if (rcnt < 0) | |
1321 | { | |
420a0d19 | 1322 | int err = errno; |
2ea97746 CE |
1323 | if (rcnt == -1) |
1324 | break; | |
420a0d19 CE |
1325 | (void) pclose(scanner_out); |
1326 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
2ea97746 CE |
1327 | return m_panic_defer(scanent, NULL, string_sprintf( |
1328 | "unable to read from scanner (%s): %s", | |
1329 | commandline, strerror(err))); | |
1330 | } | |
420a0d19 | 1331 | |
2ea97746 CE |
1332 | if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record)) |
1333 | { | |
1334 | /* short write */ | |
1335 | (void) pclose(scanner_out); | |
1336 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1337 | return m_panic_defer(scanent, NULL, string_sprintf( | |
1338 | "short write on scanner output file (%s).", file_name)); | |
420a0d19 | 1339 | } |
2ea97746 CE |
1340 | putc('\n', scanner_record); |
1341 | /* try trigger match */ | |
1342 | if ( !trigger | |
1343 | && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1) | |
1344 | ) | |
1345 | trigger = 1; | |
420a0d19 CE |
1346 | } |
1347 | ||
2ea97746 CE |
1348 | (void)fclose(scanner_record); |
1349 | sep = pclose(scanner_out); | |
1350 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1351 | if (sep != 0) | |
1352 | return m_panic_defer(scanent, NULL, | |
1353 | sep == -1 | |
1354 | ? string_sprintf("running scanner failed: %s", strerror(sep)) | |
1355 | : string_sprintf("scanner returned error code: %d", sep)); | |
420a0d19 | 1356 | |
2ea97746 CE |
1357 | if (trigger) |
1358 | { | |
1359 | uschar * s; | |
1360 | /* setup default virus name */ | |
1361 | malware_name = US"unknown"; | |
1362 | ||
1363 | /* re-open the scanner output file, look for name match */ | |
1364 | scanner_record = fopen(CS file_name, "rb"); | |
1365 | while (fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) | |
1366 | { | |
1367 | /* try match */ | |
1368 | if ((s = m_pcre_exec(cmdline_regex_re, linebuffer))) | |
1369 | malware_name = s; | |
420a0d19 | 1370 | } |
2ea97746 | 1371 | (void)fclose(scanner_record); |
420a0d19 | 1372 | } |
2ea97746 CE |
1373 | else /* no virus found */ |
1374 | malware_name = NULL; | |
1375 | break; | |
420a0d19 | 1376 | } /* cmdline */ |
2ea97746 | 1377 | #endif |
420a0d19 | 1378 | |
2ea97746 | 1379 | #ifndef DISABLE_MAL_SOPHIE |
420a0d19 CE |
1380 | case M_SOPHIE: /* "sophie" scanner type --------------------------------- */ |
1381 | { | |
2ea97746 CE |
1382 | int bread = 0; |
1383 | uschar *p; | |
1384 | uschar * file_name; | |
1385 | uschar av_buffer[1024]; | |
1386 | ||
1387 | /* pass the scan directory to sophie */ | |
1388 | file_name = string_copy(eml_filename); | |
1389 | if ((p = Ustrrchr(file_name, '/'))) | |
1390 | *p = '\0'; | |
1391 | ||
1392 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", | |
1393 | scanner_name, scanner_options); | |
1394 | ||
1395 | if ( write(malware_daemon_ctx.sock, file_name, Ustrlen(file_name)) < 0 | |
1396 | || write(malware_daemon_ctx.sock, "\n", 1) != 1 | |
1397 | ) | |
1398 | return m_panic_defer_3(scanent, CUS callout_address, | |
1399 | string_sprintf("unable to write to UNIX socket (%s)", scanner_options), | |
1400 | malware_daemon_ctx.sock); | |
1401 | ||
1402 | /* wait for result */ | |
1403 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1404 | if ((bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL))) <= 0) | |
1405 | return m_panic_defer_3(scanent, CUS callout_address, | |
1406 | string_sprintf("unable to read from UNIX socket (%s)", scanner_options), | |
1407 | malware_daemon_ctx.sock); | |
1408 | ||
1409 | /* infected ? */ | |
1410 | if (av_buffer[0] == '1') { | |
1411 | uschar * s = Ustrchr(av_buffer, '\n'); | |
1412 | if (s) | |
1413 | *s = '\0'; | |
1414 | malware_name = string_copy(&av_buffer[2]); | |
1415 | } | |
1416 | else if (!strncmp(CS av_buffer, "-1", 2)) | |
1417 | return m_panic_defer_3(scanent, CUS callout_address, | |
1418 | US"scanner reported error", malware_daemon_ctx.sock); | |
1419 | else /* all ok, no virus */ | |
1420 | malware_name = NULL; | |
420a0d19 | 1421 | |
2ea97746 | 1422 | break; |
420a0d19 | 1423 | } |
2ea97746 | 1424 | #endif |
420a0d19 | 1425 | |
2ea97746 | 1426 | #ifndef DISABLE_MAL_CLAM |
420a0d19 CE |
1427 | case M_CLAMD: /* "clamd" scanner type ----------------------------------- */ |
1428 | { | |
2ea97746 CE |
1429 | /* This code was originally contributed by David Saez */ |
1430 | /* There are three scanning methods available to us: | |
1431 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1432 | * (2) Use the STREAM command, send the data on a separate port | |
1433 | * (3) Use the zINSTREAM command, send the data inline | |
1434 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1435 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1436 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
1437 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM | |
1438 | * See Exim bug 926 for details. */ | |
1439 | ||
1440 | uschar *p, *vname, *result_tag; | |
1441 | int bread=0; | |
1442 | uschar av_buffer[1024]; | |
1443 | uschar *hostname = US""; | |
1444 | host_item connhost; | |
1445 | uschar *clamav_fbuf; | |
1446 | int clam_fd, result; | |
1447 | off_t fsize; | |
1448 | unsigned int fsize_uint; | |
1449 | BOOL use_scan_command = FALSE; | |
1450 | clamd_address * cv[MAX_CLAMD_SERVERS]; | |
1451 | int num_servers = 0; | |
1452 | uint32_t send_size, send_final_zeroblock; | |
1453 | blob cmd_str; | |
1454 | ||
1455 | /*XXX if unixdomain socket, only one server supported. Needs fixing; | |
1456 | there's no reason we should not mix local and remote servers */ | |
1457 | ||
1458 | if (*scanner_options == '/') | |
1459 | { | |
1460 | clamd_address * cd; | |
1461 | const uschar * sublist; | |
1462 | int subsep = ' '; | |
1463 | ||
1464 | /* Local file; so we def want to use_scan_command and don't want to try | |
1465 | * passing IP/port combinations */ | |
1466 | use_scan_command = TRUE; | |
1467 | cd = (clamd_address *) store_get(sizeof(clamd_address)); | |
1468 | ||
1469 | /* extract socket-path part */ | |
1470 | sublist = scanner_options; | |
1471 | cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0); | |
1472 | ||
1473 | /* parse options */ | |
1474 | if (clamd_option(cd, sublist, &subsep) != OK) | |
1475 | return m_panic_defer(scanent, NULL, | |
1476 | string_sprintf("bad option '%s'", scanner_options)); | |
1477 | cv[0] = cd; | |
1478 | } | |
1479 | else | |
1480 | { | |
1481 | /* Go through the rest of the list of host/port and construct an array | |
1482 | * of servers to try. The first one is the bit we just passed from | |
1483 | * scanner_options so process that first and then scan the remainder of | |
1484 | * the address buffer */ | |
1485 | do | |
1486 | { | |
1487 | clamd_address * cd; | |
1488 | const uschar * sublist; | |
1489 | int subsep = ' '; | |
1490 | uschar * s; | |
420a0d19 | 1491 | |
2ea97746 CE |
1492 | /* The 'local' option means use the SCAN command over the network |
1493 | * socket (ie common file storage in use) */ | |
1494 | /*XXX we could accept this also as a local option? */ | |
1495 | if (strcmpic(scanner_options, US"local") == 0) | |
1496 | { | |
1497 | use_scan_command = TRUE; | |
1498 | continue; | |
420a0d19 CE |
1499 | } |
1500 | ||
2ea97746 | 1501 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
420a0d19 | 1502 | |
2ea97746 CE |
1503 | /* extract host and port part */ |
1504 | sublist = scanner_options; | |
1505 | if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
1506 | { | |
1507 | (void) m_panic_defer(scanent, NULL, | |
1508 | string_sprintf("missing address: '%s'", scanner_options)); | |
1509 | continue; | |
420a0d19 | 1510 | } |
2ea97746 CE |
1511 | if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0))) |
1512 | { | |
1513 | (void) m_panic_defer(scanent, NULL, | |
1514 | string_sprintf("missing port: '%s'", scanner_options)); | |
1515 | continue; | |
1516 | } | |
1517 | cd->tcp_port = atoi(CS s); | |
420a0d19 | 1518 | |
2ea97746 CE |
1519 | /* parse options */ |
1520 | /*XXX should these options be common over scanner types? */ | |
1521 | if (clamd_option(cd, sublist, &subsep) != OK) | |
1522 | return m_panic_defer(scanent, NULL, | |
1523 | string_sprintf("bad option '%s'", scanner_options)); | |
420a0d19 | 1524 | |
2ea97746 CE |
1525 | cv[num_servers++] = cd; |
1526 | if (num_servers >= MAX_CLAMD_SERVERS) | |
1527 | { | |
1528 | (void) m_panic_defer(scanent, NULL, | |
1529 | US"More than " MAX_CLAMD_SERVERS_S " clamd servers " | |
1530 | "specified; only using the first " MAX_CLAMD_SERVERS_S ); | |
1531 | break; | |
1532 | } | |
1533 | } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep, | |
1534 | NULL, 0))); | |
420a0d19 | 1535 | |
2ea97746 CE |
1536 | /* check if we have at least one server */ |
1537 | if (!num_servers) | |
1538 | return m_panic_defer(scanent, NULL, | |
1539 | US"no useable server addresses in malware configuration option."); | |
420a0d19 CE |
1540 | } |
1541 | ||
2ea97746 CE |
1542 | /* See the discussion of response formats below to see why we really |
1543 | don't like colons in filenames when passing filenames to ClamAV. */ | |
1544 | if (use_scan_command && Ustrchr(eml_filename, ':')) | |
1545 | return m_panic_defer(scanent, NULL, | |
1546 | string_sprintf("local/SCAN mode incompatible with" \ | |
1547 | " : in path to email filename [%s]", eml_filename)); | |
1548 | ||
1549 | /* Set up the very first data we will be sending */ | |
1550 | if (!use_scan_command) | |
1551 | { cmd_str.data = US"zINSTREAM"; cmd_str.len = 10; } | |
1552 | else | |
1553 | { | |
1554 | cmd_str.data = string_sprintf("SCAN %s\n", eml_filename); | |
1555 | cmd_str.len = Ustrlen(cmd_str.data); | |
1556 | } | |
420a0d19 | 1557 | |
2ea97746 CE |
1558 | /* We have some network servers specified */ |
1559 | if (num_servers) | |
1560 | { | |
1561 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd | |
1562 | * only supports AF_INET, but we should probably be looking to the | |
1563 | * future and rewriting this to be protocol-independent anyway. */ | |
420a0d19 | 1564 | |
2ea97746 CE |
1565 | while (num_servers > 0) |
1566 | { | |
1567 | int i = random_number(num_servers); | |
1568 | clamd_address * cd = cv[i]; | |
420a0d19 | 1569 | |
2ea97746 CE |
1570 | DEBUG(D_acl) debug_printf_indent("trying server name %s, port %u\n", |
1571 | cd->hostspec, cd->tcp_port); | |
420a0d19 | 1572 | |
2ea97746 CE |
1573 | /* Lookup the host. This is to ensure that we connect to the same IP |
1574 | * on both connections (as one host could resolve to multiple ips) */ | |
1575 | for (;;) | |
1576 | { | |
1577 | /*XXX we trust that the cmd_str is ideempotent */ | |
1578 | if ((malware_daemon_ctx.sock = m_tcpsocket(cd->hostspec, cd->tcp_port, | |
1579 | &connhost, &errstr, &cmd_str)) >= 0) | |
1580 | { | |
1581 | /* Connection successfully established with a server */ | |
1582 | hostname = cd->hostspec; | |
1583 | cmd_str.len = 0; | |
1584 | break; | |
1585 | } | |
1586 | if (cd->retry <= 0) break; | |
1587 | while (cd->retry > 0) cd->retry = sleep(cd->retry); | |
1588 | } | |
1589 | if (malware_daemon_ctx.sock >= 0) | |
1590 | break; | |
420a0d19 | 1591 | |
2ea97746 | 1592 | (void) m_panic_defer(scanent, CUS callout_address, errstr); |
420a0d19 | 1593 | |
2ea97746 CE |
1594 | /* Remove the server from the list. XXX We should free the memory */ |
1595 | num_servers--; | |
1596 | for (; i < num_servers; i++) | |
1597 | cv[i] = cv[i+1]; | |
1598 | } | |
420a0d19 | 1599 | |
2ea97746 CE |
1600 | if (num_servers == 0) |
1601 | return m_panic_defer(scanent, NULL, US"all servers failed"); | |
1602 | } | |
1603 | else | |
1604 | for (;;) | |
1605 | { | |
1606 | if ((malware_daemon_ctx.sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0) | |
1607 | { | |
1608 | hostname = cv[0]->hostspec; | |
1609 | break; | |
1610 | } | |
1611 | if (cv[0]->retry <= 0) | |
1612 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
1613 | while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry); | |
1614 | } | |
420a0d19 | 1615 | |
2ea97746 CE |
1616 | /* have socket in variable "sock"; command to use is semi-independent of |
1617 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1618 | * domain socket, or explicitly told local) else we stream the data. | |
1619 | * How we stream the data depends upon how we were built. */ | |
420a0d19 | 1620 | |
2ea97746 CE |
1621 | if (!use_scan_command) |
1622 | { | |
1623 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> | |
1624 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1625 | chunk. */ | |
1626 | ||
1627 | DEBUG(D_acl) debug_printf_indent( | |
1628 | "Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", | |
1629 | scanner_name); | |
1630 | ||
1631 | /* Pass the string to ClamAV (10 = "zINSTREAM\0"), if not already sent */ | |
1632 | if (cmd_str.len) | |
1633 | if (send(malware_daemon_ctx.sock, cmd_str.data, cmd_str.len, 0) < 0) | |
1634 | return m_panic_defer_3(scanent, CUS hostname, | |
420a0d19 CE |
1635 | string_sprintf("unable to send zINSTREAM to socket (%s)", |
1636 | strerror(errno)), | |
2ea97746 CE |
1637 | malware_daemon_ctx.sock); |
1638 | ||
1639 | /* calc file size */ | |
1640 | if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) | |
1641 | { | |
1642 | int err = errno; | |
1643 | return m_panic_defer_3(scanent, NULL, | |
1644 | string_sprintf("can't open spool file %s: %s", | |
1645 | eml_filename, strerror(err)), | |
1646 | malware_daemon_ctx.sock); | |
420a0d19 | 1647 | } |
2ea97746 CE |
1648 | if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) |
1649 | { | |
1650 | int err; | |
1651 | b_seek: err = errno; | |
1652 | (void)close(clam_fd); | |
1653 | return m_panic_defer_3(scanent, NULL, | |
1654 | string_sprintf("can't seek spool file %s: %s", | |
1655 | eml_filename, strerror(err)), | |
1656 | malware_daemon_ctx.sock); | |
420a0d19 | 1657 | } |
2ea97746 CE |
1658 | fsize_uint = (unsigned int) fsize; |
1659 | if ((off_t)fsize_uint != fsize) | |
1660 | { | |
1661 | (void)close(clam_fd); | |
1662 | return m_panic_defer_3(scanent, NULL, | |
1663 | string_sprintf("seeking spool file %s, size overflow", | |
1664 | eml_filename), | |
1665 | malware_daemon_ctx.sock); | |
420a0d19 | 1666 | } |
2ea97746 CE |
1667 | if (lseek(clam_fd, 0, SEEK_SET) < 0) |
1668 | goto b_seek; | |
420a0d19 | 1669 | |
2ea97746 CE |
1670 | if (!(clamav_fbuf = US malloc(fsize_uint))) |
1671 | { | |
420a0d19 | 1672 | (void)close(clam_fd); |
2ea97746 CE |
1673 | return m_panic_defer_3(scanent, NULL, |
1674 | string_sprintf("unable to allocate memory %u for file (%s)", | |
1675 | fsize_uint, eml_filename), | |
1676 | malware_daemon_ctx.sock); | |
420a0d19 | 1677 | } |
420a0d19 | 1678 | |
2ea97746 CE |
1679 | if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0) |
1680 | { | |
1681 | int err = errno; | |
1682 | free(clamav_fbuf); (void)close(clam_fd); | |
1683 | return m_panic_defer_3(scanent, NULL, | |
1684 | string_sprintf("can't read spool file %s: %s", | |
1685 | eml_filename, strerror(err)), | |
1686 | malware_daemon_ctx.sock); | |
1687 | } | |
1688 | (void)close(clam_fd); | |
1689 | ||
1690 | /* send file body to socket */ | |
1691 | send_size = htonl(fsize_uint); | |
1692 | send_final_zeroblock = 0; | |
1693 | if ((send(malware_daemon_ctx.sock, &send_size, sizeof(send_size), 0) < 0) || | |
1694 | (send(malware_daemon_ctx.sock, clamav_fbuf, fsize_uint, 0) < 0) || | |
1695 | (send(malware_daemon_ctx.sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
1696 | { | |
420a0d19 | 1697 | free(clamav_fbuf); |
2ea97746 CE |
1698 | return m_panic_defer_3(scanent, NULL, |
1699 | string_sprintf("unable to send file body to socket (%s)", hostname), | |
1700 | malware_daemon_ctx.sock); | |
1701 | } | |
420a0d19 | 1702 | |
2ea97746 CE |
1703 | free(clamav_fbuf); |
1704 | } | |
1705 | else | |
1706 | { /* use scan command */ | |
1707 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1708 | * scan-method-neutral part, read the response back */ | |
1709 | ||
1710 | /* ================================================================= */ | |
1711 | ||
1712 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1713 | which dates to when ClamAV needed us to break apart the email into the | |
1714 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1715 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1716 | doing this would actually have resulted in the mail attachments being | |
1717 | scanned twice, in the broken out files and from the original .eml. | |
1718 | Since ClamAV now handles emails (and has for quite some time) we can | |
1719 | just use the email file itself. */ | |
1720 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0), if not already sent */ | |
1721 | ||
1722 | DEBUG(D_acl) debug_printf_indent( | |
1723 | "Malware scan: issuing %s local-path scan [%s]\n", | |
1724 | scanner_name, scanner_options); | |
420a0d19 | 1725 | |
2ea97746 CE |
1726 | if (cmd_str.len) |
1727 | if (send(malware_daemon_ctx.sock, cmd_str.data, cmd_str.len, 0) < 0) | |
1728 | return m_panic_defer_3(scanent, CUS callout_address, | |
420a0d19 | 1729 | string_sprintf("unable to write to socket (%s)", strerror(errno)), |
2ea97746 | 1730 | malware_daemon_ctx.sock); |
420a0d19 | 1731 | |
2ea97746 CE |
1732 | /* Do not shut down the socket for writing; a user report noted that |
1733 | * clamd 0.70 does not react well to this. */ | |
420a0d19 | 1734 | } |
2ea97746 CE |
1735 | /* Commands have been sent, no matter which scan method or connection |
1736 | * type we're using; now just read the result, independent of method. */ | |
1737 | ||
1738 | /* Read the result */ | |
1739 | memset(av_buffer, 0, sizeof(av_buffer)); | |
1740 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
1741 | (void)close(malware_daemon_ctx.sock); | |
1742 | malware_daemon_ctx.sock = -1; | |
1743 | malware_daemon_ctx.tls_ctx = NULL; | |
1744 | ||
1745 | if (bread <= 0) | |
1746 | return m_panic_defer(scanent, CUS callout_address, | |
1747 | string_sprintf("unable to read from socket (%s)", | |
1748 | errno == 0 ? "EOF" : strerror(errno))); | |
1749 | ||
1750 | if (bread == sizeof(av_buffer)) | |
1751 | return m_panic_defer(scanent, CUS callout_address, | |
1752 | US"buffer too small"); | |
1753 | /* We're now assured of a NULL at the end of av_buffer */ | |
1754 | ||
1755 | /* Check the result. ClamAV returns one of two result formats. | |
1756 | In the basic mode, the response is of the form: | |
1757 | infected: -> "<filename>: <virusname> FOUND" | |
1758 | not-infected: -> "<filename>: OK" | |
1759 | error: -> "<filename>: <errcode> ERROR | |
1760 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1761 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1762 | for the infected case. Compare: | |
1763 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1764 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1765 | ||
1766 | In the streaming case, clamd uses the filename "stream" which you should | |
1767 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1768 | client app will replace "stream" with the original filename before returning | |
1769 | results to stdout, but the trace shows the data). | |
1770 | ||
1771 | We will assume that the pathname passed to clamd from Exim does not contain | |
1772 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1773 | passing a filename to clamd). */ | |
1774 | ||
1775 | if (!(*av_buffer)) | |
1776 | return m_panic_defer(scanent, CUS callout_address, | |
1777 | US"ClamAV returned null"); | |
1778 | ||
1779 | /* strip newline at the end (won't be present for zINSTREAM) | |
1780 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1781 | this below, so double-check) */ | |
1782 | p = av_buffer + Ustrlen(av_buffer) - 1; | |
1783 | if (*p == '\n') *p = '\0'; | |
1784 | ||
1785 | DEBUG(D_acl) debug_printf_indent("Malware response: %s\n", av_buffer); | |
1786 | ||
1787 | while (isspace(*--p) && (p > av_buffer)) | |
1788 | *p = '\0'; | |
1789 | if (*p) ++p; | |
1790 | ||
1791 | /* colon in returned output? */ | |
1792 | if(!(p = Ustrchr(av_buffer,':'))) | |
1793 | return m_panic_defer(scanent, CUS callout_address, string_sprintf( | |
1794 | "ClamAV returned malformed result (missing colon): %s", | |
1795 | av_buffer)); | |
1796 | ||
1797 | /* strip filename */ | |
1798 | while (*p && isspace(*++p)) /**/; | |
1799 | vname = p; | |
1800 | ||
1801 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1802 | but we should at least be resistant to it. */ | |
1803 | p = Ustrrchr(vname, ' '); | |
1804 | result_tag = p ? p+1 : vname; | |
1805 | ||
1806 | if (Ustrcmp(result_tag, "FOUND") == 0) | |
1807 | { | |
1808 | /* p should still be the whitespace before the result_tag */ | |
1809 | while (isspace(*p)) --p; | |
1810 | *++p = '\0'; | |
1811 | /* Strip off the extended information too, which will be in parens | |
1812 | after the virus name, with no intervening whitespace. */ | |
1813 | if (*--p == ')') | |
1814 | { | |
1815 | /* "(hash:size)", so previous '(' will do; if not found, we have | |
1816 | a curious virus name, but not an error. */ | |
1817 | p = Ustrrchr(vname, '('); | |
1818 | if (p) | |
1819 | *p = '\0'; | |
420a0d19 | 1820 | } |
2ea97746 CE |
1821 | malware_name = string_copy(vname); |
1822 | DEBUG(D_acl) debug_printf_indent("Malware found, name \"%s\"\n", malware_name); | |
420a0d19 | 1823 | |
2ea97746 CE |
1824 | } |
1825 | else if (Ustrcmp(result_tag, "ERROR") == 0) | |
1826 | return m_panic_defer(scanent, CUS callout_address, | |
1827 | string_sprintf("ClamAV returned: %s", av_buffer)); | |
420a0d19 | 1828 | |
2ea97746 CE |
1829 | else if (Ustrcmp(result_tag, "OK") == 0) |
1830 | { | |
1831 | /* Everything should be OK */ | |
1832 | malware_name = NULL; | |
1833 | DEBUG(D_acl) debug_printf_indent("Malware not found\n"); | |
420a0d19 | 1834 | |
2ea97746 CE |
1835 | } |
1836 | else | |
1837 | return m_panic_defer(scanent, CUS callout_address, | |
1838 | string_sprintf("unparseable response from ClamAV: {%s}", av_buffer)); | |
420a0d19 | 1839 | |
2ea97746 | 1840 | break; |
420a0d19 | 1841 | } /* clamd */ |
2ea97746 | 1842 | #endif |
420a0d19 | 1843 | |
2ea97746 | 1844 | #ifndef DISABLE_MAL_SOCK |
420a0d19 | 1845 | case M_SOCK: /* "sock" scanner type ------------------------------------- */ |
2ea97746 CE |
1846 | /* This code was derived by Martin Poole from the clamd code contributed |
1847 | by David Saez and the cmdline code | |
1848 | */ | |
420a0d19 | 1849 | { |
2ea97746 CE |
1850 | int bread; |
1851 | uschar * commandline; | |
1852 | uschar av_buffer[1024]; | |
1853 | uschar * linebuffer; | |
1854 | uschar * sockline_scanner; | |
1855 | uschar sockline_scanner_default[] = "%s\n"; | |
1856 | const pcre *sockline_trig_re; | |
1857 | const pcre *sockline_name_re; | |
1858 | ||
1859 | /* find scanner command line */ | |
1860 | if ( (sockline_scanner = string_nextinlist(&av_scanner_work, &sep, | |
1861 | NULL, 0)) | |
1862 | && *sockline_scanner | |
1863 | ) | |
1864 | { /* check for no expansions apart from one %s */ | |
1865 | uschar * s = Ustrchr(sockline_scanner, '%'); | |
1866 | if (s++) | |
1867 | if ((*s != 's' && *s != '%') || Ustrchr(s+1, '%')) | |
1868 | return m_panic_defer_3(scanent, NULL, | |
1869 | US"unsafe sock scanner call spec", malware_daemon_ctx.sock); | |
1870 | } | |
1871 | else | |
1872 | sockline_scanner = sockline_scanner_default; | |
1873 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "cmdline: ", | |
1874 | string_printing(sockline_scanner)); | |
1875 | ||
1876 | /* find scanner output trigger */ | |
1877 | sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1878 | "missing trigger specification", &errstr); | |
1879 | if (!sockline_trig_re) | |
1880 | return m_panic_defer_3(scanent, NULL, errstr, malware_daemon_ctx.sock); | |
1881 | ||
1882 | /* find virus name regex */ | |
1883 | sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1884 | "missing virus name regex specification", &errstr); | |
1885 | if (!sockline_name_re) | |
1886 | return m_panic_defer_3(scanent, NULL, errstr, malware_daemon_ctx.sock); | |
1887 | ||
1888 | /* prepare scanner call - security depends on expansions check above */ | |
1889 | commandline = string_sprintf( CS sockline_scanner, CS eml_filename); | |
1890 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "expanded: ", | |
1891 | string_printing(commandline)); | |
1892 | ||
1893 | /* Pass the command string to the socket */ | |
1894 | if (m_sock_send(malware_daemon_ctx.sock, commandline, Ustrlen(commandline), &errstr) < 0) | |
1895 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
1896 | ||
1897 | /* Read the result */ | |
1898 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); | |
1899 | ||
1900 | if (bread <= 0) | |
1901 | return m_panic_defer_3(scanent, CUS callout_address, | |
1902 | string_sprintf("unable to read from socket (%s)", strerror(errno)), | |
1903 | malware_daemon_ctx.sock); | |
1904 | ||
1905 | if (bread == sizeof(av_buffer)) | |
1906 | return m_panic_defer_3(scanent, CUS callout_address, | |
1907 | US"buffer too small", malware_daemon_ctx.sock); | |
1908 | av_buffer[bread] = '\0'; | |
1909 | linebuffer = string_copy(av_buffer); | |
1910 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "answer: ", | |
1911 | string_printing(linebuffer)); | |
1912 | ||
1913 | /* try trigger match */ | |
1914 | if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) | |
1915 | { | |
1916 | if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer))) | |
1917 | malware_name = US "unknown"; | |
1918 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "name: ", | |
1919 | string_printing(malware_name)); | |
420a0d19 | 1920 | } |
2ea97746 CE |
1921 | else /* no virus found */ |
1922 | malware_name = NULL; | |
1923 | break; | |
1924 | } | |
1925 | #endif | |
420a0d19 | 1926 | |
2ea97746 CE |
1927 | #ifndef DISABLE_MAL_MKS |
1928 | case M_MKSD: /* "mksd" scanner type ------------------------------------- */ | |
1929 | { | |
1930 | char *mksd_options_end; | |
1931 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1932 | int retval; | |
420a0d19 | 1933 | |
2ea97746 CE |
1934 | if (scanner_options) |
1935 | { | |
1936 | mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10); | |
1937 | if ( *scanner_options == '\0' | |
1938 | || *mksd_options_end != '\0' | |
1939 | || mksd_maxproc < 1 | |
1940 | || mksd_maxproc > 32 | |
1941 | ) | |
1942 | return m_panic_defer(scanent, CUS callout_address, | |
1943 | string_sprintf("invalid option '%s'", scanner_options)); | |
1944 | } | |
420a0d19 | 1945 | |
2ea97746 CE |
1946 | if((malware_daemon_ctx.sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0) |
1947 | return m_panic_defer(scanent, CUS callout_address, errstr); | |
420a0d19 | 1948 | |
2ea97746 | 1949 | malware_name = NULL; |
420a0d19 | 1950 | |
2ea97746 | 1951 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan\n", scanner_name); |
420a0d19 | 1952 | |
2ea97746 CE |
1953 | if ((retval = mksd_scan_packed(scanent, malware_daemon_ctx.sock, eml_filename, tmo)) != OK) |
1954 | { | |
1955 | close (malware_daemon_ctx.sock); | |
1956 | return retval; | |
420a0d19 | 1957 | } |
2ea97746 | 1958 | break; |
420a0d19 | 1959 | } |
2ea97746 | 1960 | #endif |
420a0d19 | 1961 | |
2ea97746 CE |
1962 | #ifndef DISABLE_MAL_AVAST |
1963 | case M_AVAST: /* "avast" scanner type ----------------------------------- */ | |
420a0d19 | 1964 | { |
2ea97746 CE |
1965 | uschar buf[1024]; |
1966 | uschar * scanrequest; | |
1967 | enum {AVA_HELO, AVA_OPT, AVA_RSP, AVA_DONE} avast_stage; | |
1968 | int nread; | |
1969 | uschar * error_message = NULL; | |
1970 | BOOL more_data = FALSE; | |
1971 | BOOL strict = TRUE; | |
1972 | ||
1973 | /* According to Martin Tuma @avast the protocol uses "escaped | |
1974 | whitespace", that is, every embedded whitespace is backslash | |
1975 | escaped, as well as backslash is protected by backslash. | |
1976 | The returned lines contain the name of the scanned file, a tab | |
1977 | and the [ ] marker. | |
1978 | [+] - not infected | |
1979 | [L] - infected | |
1980 | [E] - some error occurred | |
1981 | Such marker follows the first non-escaped TAB. For more information | |
1982 | see avast-protocol(5) | |
1983 | ||
1984 | We observed two cases: | |
1985 | -> SCAN /file | |
1986 | <- /file [E]0.0 Error 13 Permission denied | |
1987 | <- 451 SCAN Engine error 13 permission denied | |
1988 | ||
1989 | -> SCAN /file | |
1990 | <- /file… [E]3.0 Error 41120 The file is a decompression bomb | |
1991 | <- /file… [+]2.0 | |
1992 | <- /file… [+]2.0 0 Eicar Test Virus!!! | |
1993 | <- 200 SCAN OK | |
1994 | ||
1995 | If the scanner returns 4xx, DEFER is a good decision, combined | |
1996 | with a panic log entry, to get the admin's attention. | |
1997 | ||
1998 | If the scanner returns 200, we reject it as malware, if found any, | |
1999 | or, in case of an error, we set the malware message to the error | |
2000 | string. | |
2001 | ||
2002 | Some of the >= 42000 errors are message related - usually some | |
2003 | broken archives etc, but some of them are e.g. license related. | |
2004 | Once the license expires the engine starts returning errors for | |
2005 | every scanning attempt. I¹ have the full list of the error codes | |
2006 | but it is not a public API and is subject to change. It is hard | |
2007 | for me to say what you should do in case of an engine error. You | |
2008 | can have a “Treat * unscanned file as infection” policy or “Treat | |
2009 | unscanned file as clean” policy. ¹) Jakub Bednar | |
2010 | ||
2011 | */ | |
2012 | ||
2013 | if ( ( !ava_re_clean | |
2014 | && !(ava_re_clean = m_pcre_compile(ava_re_clean_str, &errstr))) | |
2015 | || ( !ava_re_virus | |
2016 | && !(ava_re_virus = m_pcre_compile(ava_re_virus_str, &errstr))) | |
2017 | || ( !ava_re_error | |
2018 | && !(ava_re_error = m_pcre_compile(ava_re_error_str, &errstr))) | |
2019 | ) | |
2020 | return malware_panic_defer(errstr); | |
2021 | ||
2022 | /* wait for result */ | |
2023 | for (avast_stage = AVA_HELO; | |
2024 | (nread = recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo)) > 0; | |
2025 | ) | |
2026 | { | |
2027 | int slen = Ustrlen(buf); | |
2028 | if (slen >= 1) | |
2029 | { | |
420a0d19 | 2030 | |
2ea97746 CE |
2031 | /* Multi line responses are bracketed between 210 … and nnn … */ |
2032 | if (Ustrncmp(buf, "210", 3) == 0) | |
2033 | { | |
2034 | more_data = 1; | |
2035 | continue; | |
2036 | } | |
2037 | else if (more_data && isdigit(buf[0])) more_data = 0; | |
420a0d19 | 2038 | |
2ea97746 CE |
2039 | switch (avast_stage) |
2040 | { | |
2041 | case AVA_HELO: | |
2042 | if (more_data) continue; | |
2043 | if (Ustrncmp(buf, "220", 3) != 0) | |
2044 | goto endloop; /* require a 220 */ | |
2045 | goto sendreq; | |
2046 | ||
2047 | case AVA_OPT: | |
2048 | if (more_data) continue; | |
2049 | if (Ustrncmp(buf, "200", 3) != 0) | |
2050 | goto endloop; /* require a 200 */ | |
2051 | ||
2052 | sendreq: | |
2053 | { | |
2054 | int len; | |
2055 | /* Check for another option to send. Newline-terminate it. */ | |
2056 | if ((scanrequest = string_nextinlist(&av_scanner_work, &sep, | |
2057 | NULL, 0))) | |
2058 | { | |
2059 | if (Ustrcmp(scanrequest, "pass_unscanned") == 0) | |
2060 | { | |
2061 | DEBUG(D_acl) debug_printf_indent("pass unscanned files as clean\n"); | |
2062 | strict = FALSE; | |
2063 | goto sendreq; | |
2064 | } | |
2065 | scanrequest = string_sprintf("%s\n", scanrequest); | |
2066 | avast_stage = AVA_OPT; /* just sent option */ | |
2067 | DEBUG(D_acl) debug_printf_indent("send to avast OPTION: %s", scanrequest); | |
2068 | } | |
2069 | else | |
2070 | { | |
2071 | scanrequest = string_sprintf("SCAN %s\n", eml_dir); | |
2072 | avast_stage = AVA_RSP; /* just sent command */ | |
2073 | DEBUG(D_acl) debug_printf_indent("send to avast REQUEST: SCAN %s\n", eml_dir); | |
2074 | } | |
420a0d19 | 2075 | |
2ea97746 CE |
2076 | /* send config-cmd or scan-request to socket */ |
2077 | len = Ustrlen(scanrequest); | |
2078 | if (send(malware_daemon_ctx.sock, scanrequest, len, 0) == -1) | |
2079 | { | |
2080 | scanrequest[len-1] = '\0'; | |
2081 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( | |
2082 | "unable to send request '%s' to socket (%s): %s", | |
2083 | scanrequest, scanner_options, strerror(errno)), malware_daemon_ctx.sock); | |
2084 | } | |
2085 | break; | |
2086 | } | |
420a0d19 | 2087 | |
2ea97746 CE |
2088 | case AVA_RSP: |
2089 | ||
2090 | if (isdigit(buf[0])) /* We're done */ | |
2091 | goto endloop; | |
2092 | ||
2093 | if (malware_name) /* Nothing else matters, just read on */ | |
2094 | break; | |
2095 | ||
2096 | if (pcre_exec(ava_re_clean, NULL, CS buf, slen, 0, 0, NULL, 0) == 0) | |
2097 | break; | |
2098 | ||
2099 | if ((malware_name = m_pcre_exec(ava_re_virus, buf))) | |
2100 | { | |
2101 | unescape(malware_name); | |
2102 | DEBUG(D_acl) | |
2103 | debug_printf_indent("unescaped malware name: '%s'\n", malware_name); | |
2104 | break; | |
2105 | } | |
2106 | ||
2107 | if (strict) /* treat scanner errors as malware */ | |
2108 | { | |
2109 | if ((malware_name = m_pcre_exec(ava_re_error, buf))) | |
2110 | { | |
2111 | unescape(malware_name); | |
2112 | DEBUG(D_acl) | |
2113 | debug_printf_indent("unescaped error message: '%s'\n", malware_name); | |
2114 | break; | |
2115 | } | |
2116 | } | |
2117 | else if (pcre_exec(ava_re_error, NULL, CS buf, slen, 0, 0, NULL, 0) == 0) | |
2118 | { | |
2119 | log_write(0, LOG_MAIN, "internal scanner error (ignored): %s", buf); | |
2120 | break; | |
2121 | } | |
2122 | ||
2123 | /* here also for any unexpected response from the scanner */ | |
2124 | DEBUG(D_acl) debug_printf("avast response not handled: '%s'\n", buf); | |
2125 | ||
2126 | goto endloop; | |
2127 | ||
2128 | default: log_write(0, LOG_PANIC, "%s:%d:%s: should not happen", | |
2129 | __FILE__, __LINE__, __FUNCTION__); | |
2130 | } | |
2131 | } | |
420a0d19 | 2132 | } |
2ea97746 CE |
2133 | |
2134 | endloop: | |
2135 | ||
2136 | if (nread == -1) error_message = US"EOF from scanner"; | |
2137 | else if (nread < 0) error_message = US"timeout from scanner"; | |
2138 | else if (nread == 0) error_message = US"got nothing from scanner"; | |
2139 | else if (buf[0] != '2') error_message = buf; | |
2140 | ||
2141 | DEBUG(D_acl) debug_printf_indent("sent to avast QUIT\n"); | |
2142 | if (send(malware_daemon_ctx.sock, "QUIT\n", 5, 0) == -1) | |
2143 | return m_panic_defer_3(scanent, CUS callout_address, | |
2144 | string_sprintf("unable to send quit request to socket (%s): %s", | |
2145 | scanner_options, strerror(errno)), malware_daemon_ctx.sock); | |
2146 | ||
2147 | if (error_message) | |
2148 | return m_panic_defer_3(scanent, CUS callout_address, error_message, malware_daemon_ctx.sock); | |
2149 | ||
420a0d19 | 2150 | } |
2ea97746 CE |
2151 | #endif |
2152 | } /* scanner type switch */ | |
420a0d19 | 2153 | |
2ea97746 CE |
2154 | if (malware_daemon_ctx.sock >= 0) |
2155 | (void) close (malware_daemon_ctx.sock); | |
2156 | malware_ok = TRUE; /* set "been here, done that" marker */ | |
420a0d19 CE |
2157 | } |
2158 | ||
2ea97746 CE |
2159 | /* match virus name against pattern (caseless ------->----------v) */ |
2160 | if (malware_name && regex_match_and_setup(re, malware_name, 0, -1)) | |
2161 | { | |
2162 | DEBUG(D_acl) debug_printf_indent( | |
2163 | "Matched regex to malware [%s] [%s]\n", malware_re, malware_name); | |
2164 | return OK; | |
420a0d19 | 2165 | } |
2ea97746 CE |
2166 | else |
2167 | return FAIL; | |
420a0d19 CE |
2168 | } |
2169 | ||
2170 | ||
2ea97746 CE |
2171 | /************************************************* |
2172 | * Scan an email for malware * | |
2173 | *************************************************/ | |
2174 | ||
2175 | /* This is the normal interface for scanning an email, which doesn't need a | |
2176 | filename; it's a wrapper around the malware_file function. | |
2177 | ||
2178 | Arguments: | |
2179 | malware_re match condition for "malware=" | |
2180 | timeout if nonzero, timeout in seconds | |
2181 | ||
2182 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
2183 | where true means malware was found (condition applies) | |
2184 | */ | |
420a0d19 | 2185 | int |
2ea97746 | 2186 | malware(const uschar * malware_re, int timeout) |
420a0d19 | 2187 | { |
2ea97746 | 2188 | int ret = malware_internal(malware_re, NULL, timeout); |
420a0d19 | 2189 | |
2ea97746 CE |
2190 | if (ret == DEFER) av_failed = TRUE; |
2191 | return ret; | |
420a0d19 CE |
2192 | } |
2193 | ||
2194 | ||
2ea97746 CE |
2195 | /************************************************* |
2196 | * Scan a file for malware * | |
2197 | *************************************************/ | |
420a0d19 | 2198 | |
2ea97746 CE |
2199 | /* This is a test wrapper for scanning an email, which is not used in |
2200 | normal processing. Scan any file, using the Exim scanning interface. | |
2201 | This function tampers with various global variables so is unsafe to use | |
2202 | in any other context. | |
420a0d19 | 2203 | |
2ea97746 CE |
2204 | Arguments: |
2205 | eml_filename a file holding the message to be scanned | |
2206 | ||
2207 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
2208 | where true means malware was found (condition applies) | |
2209 | */ | |
2210 | int | |
2211 | malware_in_file(uschar *eml_filename) | |
420a0d19 | 2212 | { |
2ea97746 CE |
2213 | uschar message_id_buf[64]; |
2214 | int ret; | |
420a0d19 | 2215 | |
2ea97746 CE |
2216 | /* spool_mbox() assumes various parameters exist, when creating |
2217 | the relevant directory and the email within */ | |
420a0d19 | 2218 | |
2ea97746 CE |
2219 | (void) string_format(message_id_buf, sizeof(message_id_buf), |
2220 | "dummy-%d", vaguely_random_number(INT_MAX)); | |
2221 | message_id = message_id_buf; | |
2222 | sender_address = US"malware-sender@example.net"; | |
2223 | return_path = US""; | |
2224 | recipients_list = NULL; | |
2225 | receive_add_recipient(US"malware-victim@example.net", -1); | |
2226 | f.enable_dollar_recipients = TRUE; | |
420a0d19 | 2227 | |
2ea97746 | 2228 | ret = malware_internal(US"*", eml_filename, 0); |
420a0d19 | 2229 | |
2ea97746 CE |
2230 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
2231 | spool_mbox_ok = 1; | |
420a0d19 | 2232 | |
2ea97746 CE |
2233 | /* don't set no_mbox_unspool; at present, there's no way for it to become |
2234 | set, but if that changes, then it should apply to these tests too */ | |
420a0d19 | 2235 | |
2ea97746 CE |
2236 | unspool_mbox(); |
2237 | ||
2238 | /* silence static analysis tools */ | |
2239 | message_id = NULL; | |
2240 | ||
2241 | return ret; | |
420a0d19 CE |
2242 | } |
2243 | ||
420a0d19 | 2244 | |
2ea97746 CE |
2245 | void |
2246 | malware_init(void) | |
2247 | { | |
2248 | if (!malware_default_re) | |
2249 | malware_default_re = regex_must_compile(malware_regex_default, FALSE, TRUE); | |
420a0d19 | 2250 | |
2ea97746 CE |
2251 | #ifndef DISABLE_MAL_DRWEB |
2252 | if (!drweb_re) | |
2253 | drweb_re = regex_must_compile(drweb_re_str, FALSE, TRUE); | |
2254 | #endif | |
2255 | #ifndef DISABLE_MAL_FSECURE | |
2256 | if (!fsec_re) | |
2257 | fsec_re = regex_must_compile(fsec_re_str, FALSE, TRUE); | |
2258 | #endif | |
2259 | #ifndef DISABLE_MAL_KAV | |
2260 | if (!kav_re_sus) | |
2261 | kav_re_sus = regex_must_compile(kav_re_sus_str, FALSE, TRUE); | |
2262 | if (!kav_re_inf) | |
2263 | kav_re_inf = regex_must_compile(kav_re_inf_str, FALSE, TRUE); | |
2264 | #endif | |
2265 | #ifndef DISABLE_MAL_AVAST | |
2266 | if (!ava_re_clean) | |
2267 | ava_re_clean = regex_must_compile(ava_re_clean_str, FALSE, TRUE); | |
2268 | if (!ava_re_virus) | |
2269 | ava_re_virus = regex_must_compile(ava_re_virus_str, FALSE, TRUE); | |
2270 | if (!ava_re_error) | |
2271 | ava_re_error = regex_must_compile(ava_re_error_str, FALSE, TRUE); | |
2272 | #endif | |
2273 | #ifndef DISABLE_MAL_FFROT6D | |
2274 | if (!fprot6d_re_error) | |
2275 | fprot6d_re_error = regex_must_compile(fprot6d_re_error_str, FALSE, TRUE); | |
2276 | if (!fprot6d_re_virus) | |
2277 | fprot6d_re_virus = regex_must_compile(fprot6d_re_virus_str, FALSE, TRUE); | |
2278 | #endif | |
2279 | } | |
420a0d19 | 2280 | |
420a0d19 | 2281 | |
2ea97746 CE |
2282 | void |
2283 | malware_show_supported(FILE * f) | |
2284 | { | |
2285 | struct scan * sc; | |
2286 | fprintf(f, "Malware:"); | |
2287 | for (sc = m_scans; sc->scancode != (scanner_t)-1; sc++) fprintf(f, " %s", sc->name); | |
2288 | fprintf(f, "\n"); | |
420a0d19 CE |
2289 | } |
2290 | ||
2ea97746 CE |
2291 | |
2292 | # endif /*!MACRO_PREDEF*/ | |
420a0d19 CE |
2293 | #endif /*WITH_CONTENT_SCAN*/ |
2294 | /* | |
2295 | * vi: aw ai sw=2 | |
2296 | */ |