Commit | Line | Data |
---|---|---|
8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 JH |
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 |
6 | * License: GPL | |
f9ba5e22 | 7 | * Copyright (c) The Exim Maintainers 2015 - 2018 |
80fea873 | 8 | */ |
8523533c TK |
9 | |
10 | /* Code for calling virus (malware) scanners. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
c11d665d | 13 | #ifdef WITH_CONTENT_SCAN /* entire file */ |
8523533c | 14 | |
c8599aad JH |
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 | } scanner_t; | |
b1f8e4f8 JH |
53 | typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t; |
54 | static struct scan | |
55 | { | |
56 | scanner_t scancode; | |
57 | const uschar * name; | |
58 | const uschar * options_default; | |
59 | contype_t conn; | |
60 | } m_scans[] = | |
61 | { | |
c11d665d | 62 | #ifndef DISABLE_MAL_FFROTD |
b1f8e4f8 | 63 | { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP }, |
c11d665d JH |
64 | #endif |
65 | #ifndef DISABLE_MAL_FFROT6D | |
66 | { M_FPROT6D, US"f-prot6d", US"localhost 10200", MC_TCP }, | |
67 | #endif | |
68 | #ifndef DISABLE_MAL_DRWEB | |
b1f8e4f8 | 69 | { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM }, |
c11d665d JH |
70 | #endif |
71 | #ifndef DISABLE_MAL_AVE | |
b1f8e4f8 | 72 | { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX }, |
c11d665d JH |
73 | #endif |
74 | #ifndef DISABLE_MAL_FSECURE | |
b1f8e4f8 | 75 | { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX }, |
c11d665d JH |
76 | #endif |
77 | #ifndef DISABLE_MAL_KAV | |
b1f8e4f8 | 78 | { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX }, |
c11d665d JH |
79 | #endif |
80 | #ifndef DISABLE_MAL_SOPHIE | |
b1f8e4f8 | 81 | { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX }, |
c11d665d JH |
82 | #endif |
83 | #ifndef DISABLE_MAL_CLAM | |
b1f8e4f8 | 84 | { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE }, |
c11d665d JH |
85 | #endif |
86 | #ifndef DISABLE_MAL_MKS | |
b1f8e4f8 | 87 | { M_MKSD, US"mksd", NULL, MC_NONE }, |
c11d665d JH |
88 | #endif |
89 | #ifndef DISABLE_MAL_AVAST | |
b6fbf22d | 90 | { M_AVAST, US"avast", US"/var/run/avast/scan.sock", MC_STRM }, |
c11d665d JH |
91 | #endif |
92 | #ifndef DISABLE_MAL_SOCK | |
93 | { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM }, | |
94 | #endif | |
95 | #ifndef DISABLE_MAL_CMDLINE | |
96 | { M_CMDL, US"cmdline", NULL, MC_NONE }, | |
97 | #endif | |
b1f8e4f8 JH |
98 | { -1, NULL, NULL, MC_NONE } /* end-marker */ |
99 | }; | |
100 | ||
c11d665d JH |
101 | /******************************************************************************/ |
102 | # ifdef MACRO_PREDEF /* build solely to predefine macros */ | |
103 | ||
104 | # include "macro_predef.h" | |
105 | ||
106 | void | |
107 | features_malware(void) | |
108 | { | |
2b8b8e4e JH |
109 | const struct scan * sc; |
110 | const uschar * s; | |
111 | uschar * t; | |
c11d665d JH |
112 | uschar buf[64]; |
113 | ||
114 | spf(buf, sizeof(buf), US"_HAVE_MALWARE_"); | |
115 | ||
116 | for (sc = m_scans; sc->scancode != -1; sc++) | |
117 | { | |
118 | for(s = sc->name, t = buf+14; *s; s++) if (*s != '-') *t++ = toupper(*s); | |
119 | *t = '\0'; | |
120 | builtin_macro_create(buf); | |
121 | } | |
122 | } | |
123 | ||
124 | /******************************************************************************/ | |
125 | # else /*!MACRO_PREDEF, main build*/ | |
126 | ||
127 | ||
128 | #define MALWARE_TIMEOUT 120 /* default timeout, seconds */ | |
129 | ||
130 | static const uschar * malware_regex_default = US ".+"; | |
131 | static const pcre * malware_default_re = NULL; | |
132 | ||
133 | ||
134 | ||
135 | #ifndef DISABLE_MAL_CLAM | |
599dcb77 | 136 | /* The maximum number of clamd servers that are supported in the configuration */ |
c11d665d JH |
137 | # define MAX_CLAMD_SERVERS 32 |
138 | # define MAX_CLAMD_SERVERS_S "32" | |
599dcb77 | 139 | |
8a512ed5 JH |
140 | typedef struct clamd_address { |
141 | uschar * hostspec; | |
142 | unsigned tcp_port; | |
143 | unsigned retry; | |
144 | } clamd_address; | |
8523533c TK |
145 | #endif |
146 | ||
a9ccd69a | 147 | |
c11d665d JH |
148 | #ifndef DISABLE_MAL_DRWEB |
149 | # define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ | |
150 | # define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
151 | # define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
8523533c | 152 | |
c11d665d JH |
153 | # define DERR_READ_ERR (1<<0) /* read error */ |
154 | # define DERR_NOMEMORY (1<<2) /* no memory */ | |
155 | # define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
156 | # define DERR_BAD_CALL (1<<15) /* wrong command */ | |
476be7e2 JH |
157 | |
158 | static const uschar * drweb_re_str = US "infected\\swith\\s*(.+?)$"; | |
159 | static const pcre * drweb_re = NULL; | |
c11d665d | 160 | #endif |
476be7e2 | 161 | |
c11d665d | 162 | #ifndef DISABLE_MAL_FSECURE |
476be7e2 JH |
163 | static const uschar * fsec_re_str = US "\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$"; |
164 | static const pcre * fsec_re = NULL; | |
c11d665d | 165 | #endif |
476be7e2 | 166 | |
c11d665d | 167 | #ifndef DISABLE_MAL_KAV |
476be7e2 JH |
168 | static const uschar * kav_re_sus_str = US "suspicion:\\s*(.+?)\\s*$"; |
169 | static const uschar * kav_re_inf_str = US "infected:\\s*(.+?)\\s*$"; | |
170 | static const pcre * kav_re_sus = NULL; | |
171 | static const pcre * kav_re_inf = NULL; | |
c11d665d | 172 | #endif |
476be7e2 | 173 | |
c11d665d | 174 | #ifndef DISABLE_MAL_AVAST |
476be7e2 | 175 | static const uschar * ava_re_clean_str = US "(?!\\\\)\\t\\[\\+\\]"; |
ad93c40f HSHR |
176 | static const uschar * ava_re_virus_str = US "(?!\\\\)\\t\\[L\\]\\d+\\.0\\t0\\s(.*)"; |
177 | static const uschar * ava_re_error_str = US "(?!\\\\)\\t\\[E\\]\\d+\\.0\\tError\\s\\d+\\s(.*)"; | |
476be7e2 JH |
178 | static const pcre * ava_re_clean = NULL; |
179 | static const pcre * ava_re_virus = NULL; | |
ad93c40f | 180 | static const pcre * ava_re_error = NULL; |
c11d665d | 181 | #endif |
476be7e2 | 182 | |
c11d665d | 183 | #ifndef DISABLE_MAL_FFROT6D |
71b32d41 ACK |
184 | static const uschar * fprot6d_re_error_str = US "^\\d+\\s<(.+?)>$"; |
185 | static const uschar * fprot6d_re_virus_str = US "^\\d+\\s<infected:\\s+(.+?)>\\s+.+$"; | |
186 | static const pcre * fprot6d_re_error = NULL; | |
187 | static const pcre * fprot6d_re_virus = NULL; | |
c11d665d | 188 | #endif |
71b32d41 | 189 | |
476be7e2 JH |
190 | |
191 | ||
192 | /******************************************************************************/ | |
193 | ||
b1f8e4f8 | 194 | /* Routine to check whether a system is big- or little-endian. |
8523533c TK |
195 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
196 | Needed for proper kavdaemon implementation. Sigh. */ | |
197 | #define BIG_MY_ENDIAN 0 | |
198 | #define LITTLE_MY_ENDIAN 1 | |
b1f8e4f8 JH |
199 | static int test_byte_order(void); |
200 | static inline int | |
201 | test_byte_order() | |
202 | { | |
203 | short int word = 0x0001; | |
5903c6ff | 204 | char *byte = CS &word; |
b1f8e4f8 | 205 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); |
8523533c TK |
206 | } |
207 | ||
b1f8e4f8 | 208 | BOOL malware_ok = FALSE; |
8523533c | 209 | |
8544e77a PP |
210 | /* Gross hacks for the -bmalware option; perhaps we should just create |
211 | the scan directory normally for that case, but look into rigging up the | |
212 | needed header variables if not already set on the command-line? */ | |
213 | extern int spool_mbox_ok; | |
55240832 | 214 | extern uschar spooled_message_id[MESSAGE_ID_LENGTH+1]; |
8544e77a | 215 | |
8544e77a | 216 | |
ad93c40f HSHR |
217 | /* Some (currently avast only) use backslash escaped whitespace, |
218 | this function undoes these escapes */ | |
46682a67 | 219 | |
ad93c40f | 220 | static inline void |
46682a67 JH |
221 | unescape(uschar *p) |
222 | { | |
223 | uschar *p0; | |
224 | for (; *p; ++p) | |
225 | if (*p == '\\' && (isspace(p[1]) || p[1] == '\\')) | |
226 | for (p0 = p; *p0; ++p0) *p0 = p0[1]; | |
ad93c40f | 227 | } |
8544e77a | 228 | |
ad93c40f | 229 | /* --- malware_*_defer --- */ |
b1f8e4f8 | 230 | static inline int |
ad93c40f | 231 | malware_panic_defer(const uschar * str) |
b1f8e4f8 | 232 | { |
8a512ed5 JH |
233 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str); |
234 | return DEFER; | |
b1f8e4f8 | 235 | } |
ad93c40f HSHR |
236 | static inline int |
237 | malware_log_defer(const uschar * str) | |
238 | { | |
239 | log_write(0, LOG_MAIN, "malware acl condition: %s", str); | |
240 | return DEFER; | |
241 | } | |
242 | /* --- m_*_defer --- */ | |
243 | static inline int | |
244 | m_panic_defer(struct scan * scanent, const uschar * hostport, | |
0ea02355 | 245 | const uschar * str) |
b1f8e4f8 | 246 | { |
ad93c40f | 247 | return malware_panic_defer(string_sprintf("%s %s : %s", |
0ea02355 | 248 | scanent->name, hostport ? hostport : CUS"", str)); |
b1f8e4f8 | 249 | } |
ad93c40f HSHR |
250 | static inline int |
251 | m_log_defer(struct scan * scanent, const uschar * hostport, | |
252 | const uschar * str) | |
253 | { | |
254 | return malware_log_defer(string_sprintf("%s %s : %s", | |
255 | scanent->name, hostport ? hostport : CUS"", str)); | |
256 | } | |
257 | /* --- m_*_defer_3 */ | |
258 | static inline int | |
259 | m_panic_defer_3(struct scan * scanent, const uschar * hostport, | |
260 | const uschar * str, int fd_to_close) | |
261 | { | |
262 | (void) close(fd_to_close); | |
263 | return m_panic_defer(scanent, hostport, str); | |
264 | } | |
265 | static inline int | |
266 | m_log_defer_3(struct scan * scanent, const uschar * hostport, | |
0ea02355 | 267 | const uschar * str, int fd_to_close) |
b1f8e4f8 | 268 | { |
8a512ed5 | 269 | (void) close(fd_to_close); |
ad93c40f | 270 | return m_log_defer(scanent, hostport, str); |
b1f8e4f8 JH |
271 | } |
272 | ||
273 | /*************************************************/ | |
274 | ||
c11d665d | 275 | #ifndef DISABLE_MAL_CLAM |
b1f8e4f8 JH |
276 | /* Only used by the Clamav code, which is working from a list of servers and |
277 | uses the returned in_addr to get a second connection to the same system. | |
278 | */ | |
279 | static inline int | |
280 | m_tcpsocket(const uschar * hostname, unsigned int port, | |
10ac8d7f | 281 | host_item * host, uschar ** errstr, const blob * fastopen_blob) |
b1f8e4f8 | 282 | { |
4a5cbaff | 283 | return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, |
10ac8d7f | 284 | host, errstr, fastopen_blob); |
b1f8e4f8 | 285 | } |
c11d665d | 286 | #endif |
b1f8e4f8 | 287 | |
b1f8e4f8 JH |
288 | static int |
289 | m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr) | |
290 | { | |
8a512ed5 JH |
291 | if (send(sock, buf, cnt, 0) < 0) |
292 | { | |
293 | int err = errno; | |
294 | (void)close(sock); | |
295 | *errstr = string_sprintf("unable to send to socket (%s): %s", | |
296 | buf, strerror(err)); | |
297 | return -1; | |
298 | } | |
299 | return sock; | |
b1f8e4f8 JH |
300 | } |
301 | ||
302 | static const pcre * | |
303 | m_pcre_compile(const uschar * re, uschar ** errstr) | |
304 | { | |
8a512ed5 JH |
305 | const uschar * rerror; |
306 | int roffset; | |
307 | const pcre * cre; | |
308 | ||
309 | cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
310 | if (!cre) | |
311 | *errstr= string_sprintf("regular expression error in '%s': %s at offset %d", | |
312 | re, rerror, roffset); | |
313 | return cre; | |
b1f8e4f8 JH |
314 | } |
315 | ||
316 | uschar * | |
317 | m_pcre_exec(const pcre * cre, uschar * text) | |
318 | { | |
8a512ed5 JH |
319 | int ovector[10*3]; |
320 | int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0, | |
c11d665d | 321 | ovector, nelem(ovector)); |
8a512ed5 JH |
322 | uschar * substr = NULL; |
323 | if (i >= 2) /* Got it */ | |
324 | pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr); | |
325 | return substr; | |
b1f8e4f8 JH |
326 | } |
327 | ||
328 | static const pcre * | |
55414b25 JH |
329 | m_pcre_nextinlist(const uschar ** list, int * sep, |
330 | char * listerr, uschar ** errstr) | |
b1f8e4f8 | 331 | { |
8a512ed5 JH |
332 | const uschar * list_ele; |
333 | const pcre * cre = NULL; | |
334 | ||
335 | if (!(list_ele = string_nextinlist(list, sep, NULL, 0))) | |
336 | *errstr = US listerr; | |
337 | else | |
ac4d558b JH |
338 | { |
339 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "RE: ", | |
340 | string_printing(list_ele)); | |
8a512ed5 | 341 | cre = m_pcre_compile(CUS list_ele, errstr); |
ac4d558b | 342 | } |
8a512ed5 | 343 | return cre; |
b1f8e4f8 JH |
344 | } |
345 | ||
4e71661f JH |
346 | /* |
347 | Simple though inefficient wrapper for reading a line. Drop CRs and the | |
348 | trailing newline. Can return early on buffer full. Null-terminate. | |
349 | Apply initial timeout if no data ready. | |
350 | ||
0f0c8159 JH |
351 | Return: number of chars - zero for an empty line |
352 | -1 on EOF | |
353 | -2 on timeout or error | |
4e71661f JH |
354 | */ |
355 | static int | |
356 | recv_line(int fd, uschar * buffer, int bsize, int tmo) | |
357 | { | |
358 | uschar * p = buffer; | |
359 | ssize_t rcv; | |
0f0c8159 | 360 | BOOL ok = FALSE; |
4e71661f JH |
361 | |
362 | if (!fd_ready(fd, tmo-time(NULL))) | |
0f0c8159 | 363 | return -2; |
4e71661f | 364 | |
0f0c8159 | 365 | /*XXX tmo handling assumes we always get a whole line */ |
4e71661f | 366 | /* read until \n */ |
0f0c8159 | 367 | errno = 0; |
4e71661f JH |
368 | while ((rcv = read(fd, p, 1)) > 0) |
369 | { | |
0f0c8159 | 370 | ok = TRUE; |
4e71661f JH |
371 | if (p-buffer > bsize-2) break; |
372 | if (*p == '\n') break; | |
373 | if (*p != '\r') p++; | |
374 | } | |
0f0c8159 JH |
375 | if (!ok) |
376 | { | |
e1d04f48 | 377 | DEBUG(D_acl) debug_printf_indent("Malware scan: read %s (%s)\n", |
0f0c8159 JH |
378 | rcv==0 ? "EOF" : "error", strerror(errno)); |
379 | return rcv==0 ? -1 : -2; | |
380 | } | |
4e71661f JH |
381 | *p = '\0'; |
382 | ||
e1d04f48 | 383 | DEBUG(D_acl) debug_printf_indent("Malware scan: read '%s'\n", buffer); |
4e71661f JH |
384 | return p - buffer; |
385 | } | |
386 | ||
387 | /* return TRUE iff size as requested */ | |
388 | static BOOL | |
389 | recv_len(int sock, void * buf, int size, int tmo) | |
390 | { | |
391 | return fd_ready(sock, tmo-time(NULL)) | |
392 | ? recv(sock, buf, size, 0) == size | |
393 | : FALSE; | |
394 | } | |
395 | ||
396 | ||
0f0c8159 | 397 | |
c11d665d | 398 | #ifndef DISABLE_MAL_MKS |
0f0c8159 JH |
399 | /* ============= private routines for the "mksd" scanner type ============== */ |
400 | ||
c11d665d | 401 | # include <sys/uio.h> |
0f0c8159 JH |
402 | |
403 | static inline int | |
404 | mksd_writev (int sock, struct iovec * iov, int iovcnt) | |
405 | { | |
406 | int i; | |
407 | ||
408 | for (;;) | |
409 | { | |
410 | do | |
411 | i = writev (sock, iov, iovcnt); | |
412 | while (i < 0 && errno == EINTR); | |
413 | if (i <= 0) | |
414 | { | |
ad93c40f | 415 | (void) malware_panic_defer( |
0f0c8159 JH |
416 | US"unable to write to mksd UNIX socket (/var/run/mksd/socket)"); |
417 | return -1; | |
418 | } | |
419 | for (;;) /* check for short write */ | |
420 | if (i >= iov->iov_len) | |
421 | { | |
422 | if (--iovcnt == 0) | |
423 | return 0; | |
424 | i -= iov->iov_len; | |
425 | iov++; | |
426 | } | |
427 | else | |
428 | { | |
429 | iov->iov_len -= i; | |
430 | iov->iov_base = CS iov->iov_base + i; | |
431 | break; | |
432 | } | |
433 | } | |
434 | } | |
435 | ||
436 | static inline int | |
437 | mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size, int tmo) | |
438 | { | |
74f1a423 | 439 | client_conn_ctx cctx = {.sock = sock}; |
0f0c8159 JH |
440 | int offset = 0; |
441 | int i; | |
442 | ||
443 | do | |
444 | { | |
74f1a423 | 445 | i = ip_recv(&cctx, av_buffer+offset, av_buffer_size-offset, tmo-time(NULL)); |
0f0c8159 JH |
446 | if (i <= 0) |
447 | { | |
ad93c40f | 448 | (void) malware_panic_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)"); |
0f0c8159 JH |
449 | return -1; |
450 | } | |
451 | ||
452 | offset += i; | |
453 | /* offset == av_buffer_size -> buffer full */ | |
454 | if (offset == av_buffer_size) | |
455 | { | |
ad93c40f | 456 | (void) malware_panic_defer(US"malformed reply received from mksd"); |
0f0c8159 JH |
457 | return -1; |
458 | } | |
459 | } while (av_buffer[offset-1] != '\n'); | |
460 | ||
461 | av_buffer[offset] = '\0'; | |
462 | return offset; | |
463 | } | |
464 | ||
465 | static inline int | |
466 | mksd_parse_line(struct scan * scanent, char * line) | |
467 | { | |
468 | char *p; | |
469 | ||
470 | switch (*line) | |
471 | { | |
472 | case 'O': /* OK */ | |
473 | return OK; | |
474 | ||
475 | case 'E': | |
476 | case 'A': /* ERR */ | |
477 | if ((p = strchr (line, '\n')) != NULL) | |
478 | *p = '\0'; | |
ad93c40f | 479 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
480 | string_sprintf("scanner failed: %s", line)); |
481 | ||
482 | default: /* VIR */ | |
483 | if ((p = strchr (line, '\n')) != NULL) | |
484 | { | |
485 | *p = '\0'; | |
486 | if ( p-line > 5 | |
487 | && line[3] == ' ' | |
488 | && (p = strchr(line+4, ' ')) != NULL | |
489 | && p-line > 4 | |
490 | ) | |
491 | { | |
492 | *p = '\0'; | |
493 | malware_name = string_copy(US line+4); | |
494 | return OK; | |
495 | } | |
496 | } | |
ad93c40f | 497 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
498 | string_sprintf("malformed reply received: %s", line)); |
499 | } | |
500 | } | |
501 | ||
502 | static int | |
503 | mksd_scan_packed(struct scan * scanent, int sock, const uschar * scan_filename, | |
504 | int tmo) | |
505 | { | |
506 | struct iovec iov[3]; | |
507 | const char *cmd = "MSQ\n"; | |
508 | uschar av_buffer[1024]; | |
509 | ||
510 | iov[0].iov_base = (void *) cmd; | |
511 | iov[0].iov_len = 3; | |
512 | iov[1].iov_base = (void *) scan_filename; | |
513 | iov[1].iov_len = Ustrlen(scan_filename); | |
514 | iov[2].iov_base = (void *) (cmd + 3); | |
515 | iov[2].iov_len = 1; | |
516 | ||
517 | if (mksd_writev (sock, iov, 3) < 0) | |
518 | return DEFER; | |
519 | ||
520 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer), tmo) < 0) | |
521 | return DEFER; | |
522 | ||
523 | return mksd_parse_line (scanent, CS av_buffer); | |
524 | } | |
c11d665d | 525 | #endif /* MKSD */ |
0f0c8159 | 526 | |
8a512ed5 | 527 | |
c11d665d | 528 | #ifndef DISABLE_MAL_CLAM |
8a512ed5 JH |
529 | static int |
530 | clamd_option(clamd_address * cd, const uschar * optstr, int * subsep) | |
531 | { | |
532 | uschar * s; | |
533 | ||
534 | cd->retry = 0; | |
535 | while ((s = string_nextinlist(&optstr, subsep, NULL, 0))) | |
8a512ed5 JH |
536 | if (Ustrncmp(s, "retry=", 6) == 0) |
537 | { | |
538 | int sec = readconf_readtime((s += 6), '\0', FALSE); | |
539 | if (sec < 0) | |
540 | return FAIL; | |
541 | cd->retry = sec; | |
542 | } | |
543 | else | |
544 | return FAIL; | |
93a6fce2 | 545 | return OK; |
8a512ed5 | 546 | } |
c11d665d JH |
547 | #endif |
548 | ||
549 | ||
8a512ed5 | 550 | |
8544e77a PP |
551 | /************************************************* |
552 | * Scan content for malware * | |
553 | *************************************************/ | |
554 | ||
555 | /* This is an internal interface for scanning an email; the normal interface | |
556 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
557 | ||
558 | Arguments: | |
0f0c8159 | 559 | malware_re match condition for "malware=" |
040721f2 JH |
560 | scan_filename the file holding the email to be scanned, if we're faking |
561 | this up for the -bmalware test, else NULL | |
0f0c8159 | 562 | timeout if nonzero, non-default timeoutl |
8544e77a PP |
563 | |
564 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
565 | where true means malware was found (condition applies) | |
566 | */ | |
b1f8e4f8 | 567 | static int |
040721f2 JH |
568 | malware_internal(const uschar * malware_re, const uschar * scan_filename, |
569 | int timeout) | |
b1f8e4f8 | 570 | { |
0f0c8159 | 571 | int sep = 0; |
55414b25 | 572 | const uschar *av_scanner_work = av_scanner; |
0f0c8159 | 573 | uschar *scanner_name; |
0f0c8159 JH |
574 | unsigned long mbox_size; |
575 | FILE *mbox_file; | |
576 | const pcre *re; | |
577 | uschar * errstr; | |
578 | struct scan * scanent; | |
579 | const uschar * scanner_options; | |
74f1a423 | 580 | client_conn_ctx malware_daemon_ctx = {.sock = -1}; |
0f0c8159 | 581 | time_t tmo; |
040721f2 | 582 | uschar * eml_filename, * eml_dir; |
0f0c8159 | 583 | |
040721f2 JH |
584 | if (!malware_re) |
585 | return FAIL; /* empty means "don't match anything" */ | |
586 | ||
587 | /* Ensure the eml mbox file is spooled up */ | |
588 | ||
589 | if (!(mbox_file = spool_mbox(&mbox_size, scan_filename, &eml_filename))) | |
ad93c40f | 590 | return malware_panic_defer(US"error while creating mbox spool file"); |
0f0c8159 | 591 | |
040721f2 JH |
592 | /* None of our current scanners need the mbox file as a stream (they use |
593 | the name), so we can close it right away. Get the directory too. */ | |
0f0c8159 | 594 | |
040721f2 JH |
595 | (void) fclose(mbox_file); |
596 | eml_dir = string_copyn(eml_filename, Ustrrchr(eml_filename, '/') - eml_filename); | |
0f0c8159 JH |
597 | |
598 | /* parse 1st option */ | |
040721f2 | 599 | if (strcmpic(malware_re, US"false") == 0 || Ustrcmp(malware_re,"0") == 0) |
0f0c8159 JH |
600 | return FAIL; /* explicitly no matching */ |
601 | ||
602 | /* special cases (match anything except empty) */ | |
476be7e2 JH |
603 | if ( strcmpic(malware_re,US"true") == 0 |
604 | || Ustrcmp(malware_re,"*") == 0 | |
605 | || Ustrcmp(malware_re,"1") == 0 | |
606 | ) | |
607 | { | |
608 | if ( !malware_default_re | |
609 | && !(malware_default_re = m_pcre_compile(malware_regex_default, &errstr))) | |
ad93c40f | 610 | return malware_panic_defer(errstr); |
0f0c8159 | 611 | malware_re = malware_regex_default; |
476be7e2 JH |
612 | re = malware_default_re; |
613 | } | |
0f0c8159 JH |
614 | |
615 | /* compile the regex, see if it works */ | |
476be7e2 | 616 | else if (!(re = m_pcre_compile(malware_re, &errstr))) |
ad93c40f | 617 | return malware_panic_defer(errstr); |
0f0c8159 JH |
618 | |
619 | /* if av_scanner starts with a dollar, expand it first */ | |
620 | if (*av_scanner == '$') | |
621 | { | |
622 | if (!(av_scanner_work = expand_string(av_scanner))) | |
ad93c40f | 623 | return malware_panic_defer( |
0f0c8159 JH |
624 | string_sprintf("av_scanner starts with $, but expansion failed: %s", |
625 | expand_string_message)); | |
b1f8e4f8 | 626 | |
0f0c8159 | 627 | DEBUG(D_acl) |
e1d04f48 | 628 | debug_printf_indent("Expanded av_scanner global: %s\n", av_scanner_work); |
0f0c8159 JH |
629 | /* disable result caching in this case */ |
630 | malware_name = NULL; | |
631 | malware_ok = FALSE; | |
8523533c TK |
632 | } |
633 | ||
0f0c8159 JH |
634 | /* Do not scan twice (unless av_scanner is dynamic). */ |
635 | if (!malware_ok) | |
636 | { | |
637 | /* find the scanner type from the av_scanner option */ | |
638 | if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
ad93c40f | 639 | return malware_panic_defer(US"av_scanner configuration variable is empty"); |
0f0c8159 JH |
640 | if (!timeout) timeout = MALWARE_TIMEOUT; |
641 | tmo = time(NULL) + timeout; | |
642 | ||
3e60dd41 JH |
643 | for (scanent = m_scans; ; scanent++) |
644 | { | |
0f0c8159 | 645 | if (!scanent->name) |
ad93c40f | 646 | return malware_panic_defer(string_sprintf("unknown scanner type '%s'", |
0f0c8159 JH |
647 | scanner_name)); |
648 | if (strcmpic(scanner_name, US scanent->name) != 0) | |
649 | continue; | |
ac4d558b JH |
650 | DEBUG(D_acl) debug_printf_indent("Malware scan: %s tmo=%s\n", |
651 | scanner_name, readconf_printtime(timeout)); | |
652 | ||
0f0c8159 JH |
653 | if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) |
654 | scanner_options = scanent->options_default; | |
655 | if (scanent->conn == MC_NONE) | |
b1f8e4f8 | 656 | break; |
ac4d558b JH |
657 | |
658 | DEBUG(D_acl) debug_printf_indent("%15s%10s%s\n", "", "socket: ", scanner_options); | |
0f0c8159 JH |
659 | switch(scanent->conn) |
660 | { | |
74f1a423 JH |
661 | case MC_TCP: |
662 | malware_daemon_ctx.sock = ip_tcpsocket(scanner_options, &errstr, 5); break; | |
663 | case MC_UNIX: | |
664 | malware_daemon_ctx.sock = ip_unixsocket(scanner_options, &errstr); break; | |
665 | case MC_STRM: | |
666 | malware_daemon_ctx.sock = ip_streamsocket(scanner_options, &errstr, 5); break; | |
667 | default: | |
668 | /* compiler quietening */ break; | |
384152a6 | 669 | } |
74f1a423 | 670 | if (malware_daemon_ctx.sock < 0) |
ad93c40f | 671 | return m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
672 | break; |
673 | } | |
8e669ac1 | 674 | |
0f0c8159 JH |
675 | switch (scanent->scancode) |
676 | { | |
c11d665d | 677 | #ifndef DISABLE_MAL_FFROTD |
0f0c8159 | 678 | case M_FPROTD: /* "f-protd" scanner type -------------------------------- */ |
b1f8e4f8 | 679 | { |
0f0c8159 JH |
680 | uschar *fp_scan_option; |
681 | unsigned int detected=0, par_count=0; | |
682 | uschar * scanrequest; | |
683 | uschar buf[32768], *strhelper, *strhelper2; | |
684 | uschar * malware_name_internal = NULL; | |
685 | int len; | |
b1f8e4f8 | 686 | |
0f0c8159 | 687 | scanrequest = string_sprintf("GET %s", eml_filename); |
b1f8e4f8 | 688 | |
0f0c8159 JH |
689 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, |
690 | NULL, 0))) | |
691 | { | |
692 | scanrequest = string_sprintf("%s%s%s", scanrequest, | |
693 | par_count ? "%20" : "?", fp_scan_option); | |
694 | par_count++; | |
695 | } | |
696 | scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest); | |
e1d04f48 | 697 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n", |
0f0c8159 | 698 | scanner_name, scanrequest); |
b1f8e4f8 | 699 | |
0f0c8159 | 700 | /* send scan request */ |
74f1a423 | 701 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) |
ad93c40f | 702 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 703 | |
74f1a423 | 704 | while ((len = recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo)) >= 0) |
0f0c8159 JH |
705 | if (len > 0) |
706 | { | |
707 | if (Ustrstr(buf, US"<detected type=\"") != NULL) | |
708 | detected = 1; | |
709 | else if (detected && (strhelper = Ustrstr(buf, US"<name>"))) | |
4e71661f | 710 | { |
0f0c8159 | 711 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) |
4e71661f | 712 | { |
0f0c8159 JH |
713 | *strhelper2 = '\0'; |
714 | malware_name_internal = string_copy(strhelper+6); | |
4e71661f JH |
715 | } |
716 | } | |
0f0c8159 | 717 | else if (Ustrstr(buf, US"<summary code=\"")) |
4e71661f | 718 | { |
0f0c8159 JH |
719 | malware_name = Ustrstr(buf, US"<summary code=\"11\">") |
720 | ? malware_name_internal : NULL; | |
721 | break; | |
4e71661f | 722 | } |
0f0c8159 JH |
723 | } |
724 | if (len < -1) | |
725 | { | |
74f1a423 | 726 | (void)close(malware_daemon_ctx.sock); |
0f0c8159 JH |
727 | return DEFER; |
728 | } | |
729 | break; | |
730 | } /* f-protd */ | |
c11d665d JH |
731 | #endif |
732 | ||
733 | #ifndef DISABLE_MAL_FFROT6D | |
734 | case M_FPROT6D: /* "f-prot6d" scanner type ----------------------------------- */ | |
735 | { | |
736 | int bread; | |
737 | uschar * e; | |
738 | uschar * linebuffer; | |
739 | uschar * scanrequest; | |
740 | uschar av_buffer[1024]; | |
741 | ||
742 | if ((!fprot6d_re_virus && !(fprot6d_re_virus = m_pcre_compile(fprot6d_re_virus_str, &errstr))) | |
743 | || (!fprot6d_re_error && !(fprot6d_re_error = m_pcre_compile(fprot6d_re_error_str, &errstr)))) | |
ad93c40f | 744 | return malware_panic_defer(errstr); |
c11d665d JH |
745 | |
746 | scanrequest = string_sprintf("SCAN FILE %s\n", eml_filename); | |
747 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n", | |
748 | scanner_name, scanrequest); | |
749 | ||
74f1a423 | 750 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest), &errstr) < 0) |
ad93c40f | 751 | return m_panic_defer(scanent, CUS callout_address, errstr); |
c11d665d | 752 | |
74f1a423 | 753 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); |
c11d665d JH |
754 | |
755 | if (bread <= 0) | |
ad93c40f | 756 | return m_panic_defer_3(scanent, CUS callout_address, |
c11d665d | 757 | string_sprintf("unable to read from socket (%s)", strerror(errno)), |
74f1a423 | 758 | malware_daemon_ctx.sock); |
c11d665d JH |
759 | |
760 | if (bread == sizeof(av_buffer)) | |
ad93c40f | 761 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 762 | US"buffer too small", malware_daemon_ctx.sock); |
c11d665d JH |
763 | |
764 | av_buffer[bread] = '\0'; | |
765 | linebuffer = string_copy(av_buffer); | |
766 | ||
74f1a423 | 767 | m_sock_send(malware_daemon_ctx.sock, US"QUIT\n", 5, 0); |
c11d665d JH |
768 | |
769 | if ((e = m_pcre_exec(fprot6d_re_error, linebuffer))) | |
ad93c40f | 770 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 771 | string_sprintf("scanner reported error (%s)", e), malware_daemon_ctx.sock); |
b1f8e4f8 | 772 | |
c11d665d JH |
773 | if (!(malware_name = m_pcre_exec(fprot6d_re_virus, linebuffer))) |
774 | malware_name = NULL; | |
775 | ||
776 | break; | |
777 | } /* f-prot6d */ | |
778 | #endif | |
779 | ||
780 | #ifndef DISABLE_MAL_DRWEB | |
0f0c8159 JH |
781 | case M_DRWEB: /* "drweb" scanner type ----------------------------------- */ |
782 | /* v0.1 - added support for tcp sockets */ | |
783 | /* v0.0 - initial release -- support for unix sockets */ | |
784 | { | |
785 | int result; | |
786 | off_t fsize; | |
787 | unsigned int fsize_uint; | |
788 | uschar * tmpbuf, *drweb_fbuf; | |
789 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
790 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
0f0c8159 JH |
791 | |
792 | /* prepare variables */ | |
793 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
794 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
795 | ||
796 | if (*scanner_options != '/') | |
797 | { | |
798 | /* calc file size */ | |
799 | if ((drweb_fd = open(CCS eml_filename, O_RDONLY)) == -1) | |
ad93c40f | 800 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
801 | string_sprintf("can't open spool file %s: %s", |
802 | eml_filename, strerror(errno)), | |
74f1a423 | 803 | malware_daemon_ctx.sock); |
b1f8e4f8 | 804 | |
0f0c8159 JH |
805 | if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) |
806 | { | |
d315eda1 JH |
807 | int err; |
808 | badseek: err = errno; | |
b1f8e4f8 | 809 | (void)close(drweb_fd); |
ad93c40f | 810 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
811 | string_sprintf("can't seek spool file %s: %s", |
812 | eml_filename, strerror(err)), | |
74f1a423 | 813 | malware_daemon_ctx.sock); |
0f0c8159 JH |
814 | } |
815 | fsize_uint = (unsigned int) fsize; | |
816 | if ((off_t)fsize_uint != fsize) | |
817 | { | |
b1f8e4f8 | 818 | (void)close(drweb_fd); |
ad93c40f | 819 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
820 | string_sprintf("seeking spool file %s, size overflow", |
821 | eml_filename), | |
74f1a423 | 822 | malware_daemon_ctx.sock); |
4e71661f | 823 | } |
0f0c8159 | 824 | drweb_slen = htonl(fsize); |
d315eda1 JH |
825 | if (lseek(drweb_fd, 0, SEEK_SET) < 0) |
826 | goto badseek; | |
0f0c8159 | 827 | |
e1d04f48 | 828 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s remote scan [%s]\n", |
0f0c8159 JH |
829 | scanner_name, scanner_options); |
830 | ||
831 | /* send scan request */ | |
74f1a423 JH |
832 | if ((send(malware_daemon_ctx.sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || |
833 | (send(malware_daemon_ctx.sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
834 | (send(malware_daemon_ctx.sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
835 | (send(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) | |
4e71661f | 836 | { |
0f0c8159 | 837 | (void)close(drweb_fd); |
ad93c40f | 838 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 | 839 | "unable to send commands to socket (%s)", scanner_options), |
74f1a423 | 840 | malware_daemon_ctx.sock); |
4e71661f | 841 | } |
8e669ac1 | 842 | |
40c90bca | 843 | if (!(drweb_fbuf = US malloc(fsize_uint))) |
0f0c8159 JH |
844 | { |
845 | (void)close(drweb_fd); | |
ad93c40f | 846 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
847 | string_sprintf("unable to allocate memory %u for file (%s)", |
848 | fsize_uint, eml_filename), | |
74f1a423 | 849 | malware_daemon_ctx.sock); |
0f0c8159 | 850 | } |
b1f8e4f8 | 851 | |
0f0c8159 JH |
852 | if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) |
853 | { | |
854 | int err = errno; | |
855 | (void)close(drweb_fd); | |
856 | free(drweb_fbuf); | |
ad93c40f | 857 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
858 | string_sprintf("can't read spool file %s: %s", |
859 | eml_filename, strerror(err)), | |
74f1a423 | 860 | malware_daemon_ctx.sock); |
0f0c8159 JH |
861 | } |
862 | (void)close(drweb_fd); | |
b1f8e4f8 | 863 | |
0f0c8159 | 864 | /* send file body to socket */ |
74f1a423 | 865 | if (send(malware_daemon_ctx.sock, drweb_fbuf, fsize, 0) < 0) |
4e71661f | 866 | { |
0f0c8159 | 867 | free(drweb_fbuf); |
ad93c40f | 868 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 | 869 | "unable to send file body to socket (%s)", scanner_options), |
74f1a423 | 870 | malware_daemon_ctx.sock); |
0f0c8159 | 871 | } |
0f0c8159 JH |
872 | } |
873 | else | |
874 | { | |
875 | drweb_slen = htonl(Ustrlen(eml_filename)); | |
b1f8e4f8 | 876 | |
e1d04f48 | 877 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s local scan [%s]\n", |
0f0c8159 | 878 | scanner_name, scanner_options); |
b1f8e4f8 | 879 | |
0f0c8159 | 880 | /* send scan request */ |
74f1a423 JH |
881 | if ((send(malware_daemon_ctx.sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || |
882 | (send(malware_daemon_ctx.sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
883 | (send(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
884 | (send(malware_daemon_ctx.sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || | |
885 | (send(malware_daemon_ctx.sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) | |
ad93c40f | 886 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 | 887 | "unable to send commands to socket (%s)", scanner_options), |
74f1a423 | 888 | malware_daemon_ctx.sock); |
0f0c8159 | 889 | } |
b1f8e4f8 | 890 | |
0f0c8159 | 891 | /* wait for result */ |
74f1a423 | 892 | if (!recv_len(malware_daemon_ctx.sock, &drweb_rc, sizeof(drweb_rc), tmo)) |
ad93c40f | 893 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 894 | US"unable to read return code", malware_daemon_ctx.sock); |
0f0c8159 JH |
895 | drweb_rc = ntohl(drweb_rc); |
896 | ||
74f1a423 | 897 | if (!recv_len(malware_daemon_ctx.sock, &drweb_vnum, sizeof(drweb_vnum), tmo)) |
ad93c40f | 898 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 899 | US"unable to read the number of viruses", malware_daemon_ctx.sock); |
0f0c8159 JH |
900 | drweb_vnum = ntohl(drweb_vnum); |
901 | ||
902 | /* "virus(es) found" if virus number is > 0 */ | |
903 | if (drweb_vnum) | |
904 | { | |
905 | int i; | |
acec9514 | 906 | gstring * g = NULL; |
b1f8e4f8 | 907 | |
0f0c8159 JH |
908 | /* setup default virus name */ |
909 | malware_name = US"unknown"; | |
b1f8e4f8 | 910 | |
0f0c8159 | 911 | /* set up match regex */ |
476be7e2 JH |
912 | if (!drweb_re) |
913 | drweb_re = m_pcre_compile(drweb_re_str, &errstr); | |
b1f8e4f8 | 914 | |
0f0c8159 JH |
915 | /* read and concatenate virus names into one string */ |
916 | for (i = 0; i < drweb_vnum; i++) | |
4e71661f | 917 | { |
acec9514 JH |
918 | int ovector[10*3]; |
919 | ||
0f0c8159 | 920 | /* read the size of report */ |
74f1a423 | 921 | if (!recv_len(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), tmo)) |
ad93c40f | 922 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 923 | US"cannot read report size", malware_daemon_ctx.sock); |
0f0c8159 JH |
924 | drweb_slen = ntohl(drweb_slen); |
925 | tmpbuf = store_get(drweb_slen); | |
b1f8e4f8 | 926 | |
0f0c8159 | 927 | /* read report body */ |
74f1a423 | 928 | if (!recv_len(malware_daemon_ctx.sock, tmpbuf, drweb_slen, tmo)) |
ad93c40f | 929 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 930 | US"cannot read report string", malware_daemon_ctx.sock); |
0f0c8159 | 931 | tmpbuf[drweb_slen] = '\0'; |
8544e77a | 932 | |
0f0c8159 JH |
933 | /* try matcher on the line, grab substring */ |
934 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, | |
c11d665d | 935 | ovector, nelem(ovector)); |
0f0c8159 JH |
936 | if (result >= 2) |
937 | { | |
938 | const char * pre_malware_nb; | |
8e669ac1 | 939 | |
0f0c8159 | 940 | pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb); |
8e669ac1 | 941 | |
0f0c8159 | 942 | if (i==0) /* the first name we just copy to malware_name */ |
b2bcdd35 | 943 | g = string_cat(NULL, US pre_malware_nb); |
8e669ac1 | 944 | |
acec9514 | 945 | /*XXX could be string_append_listele? */ |
0f0c8159 | 946 | else /* concatenate each new virus name to previous */ |
acec9514 | 947 | g = string_append(g, 2, "/", pre_malware_nb); |
8e669ac1 | 948 | |
0f0c8159 JH |
949 | pcre_free_substring(pre_malware_nb); |
950 | } | |
951 | } | |
acec9514 | 952 | malware_name = string_from_gstring(g); |
0f0c8159 JH |
953 | } |
954 | else | |
955 | { | |
956 | const char *drweb_s = NULL; | |
957 | ||
958 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
959 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
960 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
961 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
962 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
963 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
964 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
965 | * and others are ignored */ | |
966 | if (drweb_s) | |
ad93c40f | 967 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 968 | string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s), |
74f1a423 | 969 | malware_daemon_ctx.sock); |
8e669ac1 | 970 | |
0f0c8159 | 971 | /* no virus found */ |
b1f8e4f8 | 972 | malware_name = NULL; |
0f0c8159 JH |
973 | } |
974 | break; | |
975 | } /* drweb */ | |
c11d665d | 976 | #endif |
8e669ac1 | 977 | |
c11d665d | 978 | #ifndef DISABLE_MAL_AVE |
0f0c8159 JH |
979 | case M_AVES: /* "aveserver" scanner type -------------------------------- */ |
980 | { | |
981 | uschar buf[32768]; | |
982 | int result; | |
8544e77a | 983 | |
0f0c8159 JH |
984 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
985 | buf[0] = 0; | |
74f1a423 | 986 | recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo); |
8544e77a | 987 | |
0f0c8159 | 988 | if (buf[0] != '2') /* aveserver is having problems */ |
ad93c40f | 989 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 990 | string_sprintf("unavailable (Responded: %s).", |
5903c6ff | 991 | ((buf[0] != 0) ? buf : US "nothing") ), |
74f1a423 | 992 | malware_daemon_ctx.sock); |
8e669ac1 | 993 | |
0f0c8159 JH |
994 | /* prepare our command */ |
995 | (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n", | |
996 | eml_filename); | |
997 | ||
998 | /* and send it */ | |
e1d04f48 | 999 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s %s\n", |
0f0c8159 | 1000 | scanner_name, buf); |
74f1a423 | 1001 | if (m_sock_send(malware_daemon_ctx.sock, buf, Ustrlen(buf), &errstr) < 0) |
ad93c40f | 1002 | return m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1003 | |
1004 | malware_name = NULL; | |
1005 | result = 0; | |
1006 | /* read response lines, find malware name and final response */ | |
74f1a423 | 1007 | while (recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo) > 0) |
0f0c8159 JH |
1008 | { |
1009 | if (buf[0] == '2') | |
1010 | break; | |
1011 | if (buf[0] == '5') /* aveserver is having problems */ | |
4e71661f | 1012 | { |
ad93c40f | 1013 | result = m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1014 | string_sprintf("unable to scan file %s (Responded: %s).", |
1015 | eml_filename, buf)); | |
1016 | break; | |
4e71661f | 1017 | } |
0f0c8159 JH |
1018 | if (Ustrncmp(buf,"322",3) == 0) |
1019 | { | |
1020 | uschar *p = Ustrchr(&buf[4], ' '); | |
1021 | *p = '\0'; | |
1022 | malware_name = string_copy(&buf[4]); | |
1023 | } | |
1024 | } | |
1025 | ||
74f1a423 | 1026 | if (m_sock_send(malware_daemon_ctx.sock, US"quit\r\n", 6, &errstr) < 0) |
ad93c40f | 1027 | return m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1028 | |
1029 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ | |
1030 | buf[0] = 0; | |
74f1a423 | 1031 | recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo); |
0f0c8159 JH |
1032 | |
1033 | if (buf[0] != '2') /* aveserver is having problems */ | |
ad93c40f | 1034 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1035 | string_sprintf("unable to quit dialogue (Responded: %s).", |
5903c6ff | 1036 | ((buf[0] != 0) ? buf : US "nothing") ), |
74f1a423 | 1037 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1038 | |
1039 | if (result == DEFER) | |
1040 | { | |
74f1a423 | 1041 | (void)close(malware_daemon_ctx.sock); |
0f0c8159 JH |
1042 | return DEFER; |
1043 | } | |
1044 | break; | |
b1f8e4f8 | 1045 | } /* aveserver */ |
c11d665d | 1046 | #endif |
8e669ac1 | 1047 | |
c11d665d | 1048 | #ifndef DISABLE_MAL_FSECURE |
b1f8e4f8 JH |
1049 | case M_FSEC: /* "fsecure" scanner type ---------------------------------- */ |
1050 | { | |
0f0c8159 JH |
1051 | int i, j, bread = 0; |
1052 | uschar * file_name; | |
1053 | uschar av_buffer[1024]; | |
0f0c8159 JH |
1054 | static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n", |
1055 | US"CONFIGURE\tTIMEOUT\t0\n", | |
1056 | US"CONFIGURE\tMAXARCH\t5\n", | |
1057 | US"CONFIGURE\tMIME\t1\n" }; | |
1058 | ||
1059 | malware_name = NULL; | |
1060 | ||
e1d04f48 | 1061 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 JH |
1062 | scanner_name, scanner_options); |
1063 | /* pass options */ | |
1064 | memset(av_buffer, 0, sizeof(av_buffer)); | |
c11d665d | 1065 | for (i = 0; i != nelem(cmdopt); i++) |
0f0c8159 | 1066 | { |
b1f8e4f8 | 1067 | |
74f1a423 | 1068 | if (m_sock_send(malware_daemon_ctx.sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0) |
ad93c40f | 1069 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1070 | |
74f1a423 | 1071 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); |
0f0c8159 JH |
1072 | if (bread > 0) av_buffer[bread]='\0'; |
1073 | if (bread < 0) | |
ad93c40f | 1074 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1075 | string_sprintf("unable to read answer %d (%s)", i, strerror(errno)), |
74f1a423 | 1076 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1077 | for (j = 0; j < bread; j++) |
1078 | if (av_buffer[j] == '\r' || av_buffer[j] == '\n') | |
1079 | av_buffer[j] ='@'; | |
1080 | } | |
8e669ac1 | 1081 | |
0f0c8159 JH |
1082 | /* pass the mailfile to fsecure */ |
1083 | file_name = string_sprintf("SCAN\t%s\n", eml_filename); | |
b1f8e4f8 | 1084 | |
74f1a423 | 1085 | if (m_sock_send(malware_daemon_ctx.sock, file_name, Ustrlen(file_name), &errstr) < 0) |
ad93c40f | 1086 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1087 | |
0f0c8159 JH |
1088 | /* set up match */ |
1089 | /* todo also SUSPICION\t */ | |
476be7e2 JH |
1090 | if (!fsec_re) |
1091 | fsec_re = m_pcre_compile(fsec_re_str, &errstr); | |
b1f8e4f8 | 1092 | |
0f0c8159 JH |
1093 | /* read report, linewise. Apply a timeout as the Fsecure daemon |
1094 | sometimes wants an answer to "PING" but they won't tell us what */ | |
fd02dc0e | 1095 | { |
0f0c8159 JH |
1096 | uschar * p = av_buffer; |
1097 | uschar * q; | |
fd02dc0e | 1098 | |
0f0c8159 JH |
1099 | for (;;) |
1100 | { | |
80591636 | 1101 | errno = ETIMEDOUT; |
0f0c8159 | 1102 | i = av_buffer+sizeof(av_buffer)-p; |
74f1a423 | 1103 | if ((bread= ip_recv(&malware_daemon_ctx, p, i-1, tmo-time(NULL))) < 0) |
ad93c40f | 1104 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1105 | string_sprintf("unable to read result (%s)", strerror(errno)), |
74f1a423 | 1106 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1107 | |
755762fd | 1108 | for (p[bread] = '\0'; (q = Ustrchr(p, '\n')); p = q+1) |
0f0c8159 JH |
1109 | { |
1110 | *q = '\0'; | |
fd02dc0e | 1111 | |
0f0c8159 JH |
1112 | /* Really search for virus again? */ |
1113 | if (!malware_name) | |
1114 | /* try matcher on the line, grab substring */ | |
476be7e2 | 1115 | malware_name = m_pcre_exec(fsec_re, p); |
fd02dc0e | 1116 | |
0f0c8159 JH |
1117 | if (Ustrstr(p, "OK\tScan ok.")) |
1118 | goto fsec_found; | |
1119 | } | |
fd02dc0e | 1120 | |
0f0c8159 JH |
1121 | /* copy down the trailing partial line then read another chunk */ |
1122 | i = av_buffer+sizeof(av_buffer)-p; | |
1123 | memmove(av_buffer, p, i); | |
1124 | p = av_buffer+i; | |
fd02dc0e | 1125 | } |
b1f8e4f8 | 1126 | } |
fd02dc0e JH |
1127 | |
1128 | fsec_found: | |
b1f8e4f8 JH |
1129 | break; |
1130 | } /* fsecure */ | |
c11d665d | 1131 | #endif |
599dcb77 | 1132 | |
c11d665d | 1133 | #ifndef DISABLE_MAL_KAV |
b1f8e4f8 JH |
1134 | case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */ |
1135 | { | |
0f0c8159 JH |
1136 | time_t t; |
1137 | uschar tmpbuf[1024]; | |
1138 | uschar * scanrequest; | |
1139 | int kav_rc; | |
2decbec9 RC |
1140 | unsigned long kav_reportlen; |
1141 | int bread; | |
0f0c8159 JH |
1142 | const pcre *kav_re; |
1143 | uschar *p; | |
1144 | ||
1145 | /* get current date and time, build scan request */ | |
1146 | time(&t); | |
1147 | /* pdp note: before the eml_filename parameter, this scanned the | |
1148 | directory; not finding documentation, so we'll strip off the directory. | |
1149 | The side-effect is that the test framework scanning may end up in | |
1150 | scanning more than was requested, but for the normal interface, this is | |
1151 | fine. */ | |
1152 | ||
1153 | strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t)); | |
1154 | scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename); | |
1155 | p = Ustrrchr(scanrequest, '/'); | |
1156 | if (p) | |
1157 | *p = '\0'; | |
1158 | ||
e1d04f48 | 1159 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 JH |
1160 | scanner_name, scanner_options); |
1161 | ||
1162 | /* send scan request */ | |
74f1a423 | 1163 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) |
ad93c40f | 1164 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1165 | |
0f0c8159 | 1166 | /* wait for result */ |
74f1a423 | 1167 | if (!recv_len(malware_daemon_ctx.sock, tmpbuf, 2, tmo)) |
ad93c40f | 1168 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1169 | US"unable to read 2 bytes from socket.", malware_daemon_ctx.sock); |
b1f8e4f8 | 1170 | |
0f0c8159 JH |
1171 | /* get errorcode from one nibble */ |
1172 | kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F; | |
1173 | switch(kav_rc) | |
1174 | { | |
1175 | case 5: case 6: /* improper kavdaemon configuration */ | |
ad93c40f | 1176 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1177 | US"please reconfigure kavdaemon to NOT disinfect or remove infected files.", |
74f1a423 | 1178 | malware_daemon_ctx.sock); |
0f0c8159 | 1179 | case 1: |
ad93c40f | 1180 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1181 | US"reported 'scanning not completed' (code 1).", malware_daemon_ctx.sock); |
0f0c8159 | 1182 | case 7: |
ad93c40f | 1183 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1184 | US"reported 'kavdaemon damaged' (code 7).", malware_daemon_ctx.sock); |
0f0c8159 | 1185 | } |
b1f8e4f8 | 1186 | |
4c04137d | 1187 | /* code 8 is not handled, since it is ambiguous. It appears mostly on |
0f0c8159 | 1188 | bounces where part of a file has been cut off */ |
b1f8e4f8 | 1189 | |
0f0c8159 JH |
1190 | /* "virus found" return codes (2-4) */ |
1191 | if (kav_rc > 1 && kav_rc < 5) | |
b1f8e4f8 | 1192 | { |
0f0c8159 | 1193 | int report_flag = 0; |
599dcb77 | 1194 | |
0f0c8159 JH |
1195 | /* setup default virus name */ |
1196 | malware_name = US"unknown"; | |
b1f8e4f8 | 1197 | |
0f0c8159 | 1198 | report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ]; |
b1f8e4f8 | 1199 | |
0f0c8159 JH |
1200 | /* read the report, if available */ |
1201 | if (report_flag == 1) | |
1202 | { | |
1203 | /* read report size */ | |
74f1a423 | 1204 | if (!recv_len(malware_daemon_ctx.sock, &kav_reportlen, 4, tmo)) |
ad93c40f | 1205 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1206 | US"cannot read report size", malware_daemon_ctx.sock); |
b1f8e4f8 | 1207 | |
0f0c8159 JH |
1208 | /* it's possible that avp returns av_buffer[1] == 1 but the |
1209 | reportsize is 0 (!?) */ | |
1210 | if (kav_reportlen > 0) | |
4e71661f | 1211 | { |
0f0c8159 | 1212 | /* set up match regex, depends on retcode */ |
476be7e2 JH |
1213 | if (kav_rc == 3) |
1214 | { | |
1215 | if (!kav_re_sus) kav_re_sus = m_pcre_compile(kav_re_sus_str, &errstr); | |
1216 | kav_re = kav_re_sus; | |
1217 | } | |
1218 | else | |
1219 | { | |
1220 | if (!kav_re_inf) kav_re_inf = m_pcre_compile(kav_re_inf_str, &errstr); | |
1221 | kav_re = kav_re_inf; | |
1222 | } | |
0f0c8159 | 1223 | |
6e92b3ae JH |
1224 | /* read report, linewise. Using size from stream to read amount of data |
1225 | from same stream is safe enough. */ | |
1226 | /* coverity[tainted_data] */ | |
0f0c8159 | 1227 | while (kav_reportlen > 0) |
4e71661f | 1228 | { |
74f1a423 | 1229 | if ((bread = recv_line(malware_daemon_ctx.sock, tmpbuf, sizeof(tmpbuf), tmo)) < 0) |
0f0c8159 JH |
1230 | break; |
1231 | kav_reportlen -= bread+1; | |
1232 | ||
1233 | /* try matcher on the line, grab substring */ | |
1234 | if ((malware_name = m_pcre_exec(kav_re, tmpbuf))) | |
1235 | break; | |
b1f8e4f8 JH |
1236 | } |
1237 | } | |
1238 | } | |
0f0c8159 JH |
1239 | } |
1240 | else /* no virus found */ | |
1241 | malware_name = NULL; | |
599dcb77 | 1242 | |
0f0c8159 | 1243 | break; |
599dcb77 | 1244 | } |
c11d665d | 1245 | #endif |
8544e77a | 1246 | |
c11d665d | 1247 | #ifndef DISABLE_MAL_CMDLINE |
b1f8e4f8 JH |
1248 | case M_CMDL: /* "cmdline" scanner type ---------------------------------- */ |
1249 | { | |
0f0c8159 JH |
1250 | const uschar *cmdline_scanner = scanner_options; |
1251 | const pcre *cmdline_trigger_re; | |
1252 | const pcre *cmdline_regex_re; | |
1253 | uschar * file_name; | |
1254 | uschar * commandline; | |
1255 | void (*eximsigchld)(int); | |
1256 | void (*eximsigpipe)(int); | |
1257 | FILE *scanner_out = NULL; | |
1258 | int scanner_fd; | |
1259 | FILE *scanner_record = NULL; | |
1260 | uschar linebuffer[32767]; | |
1261 | int rcnt; | |
1262 | int trigger = 0; | |
1263 | uschar *p; | |
1264 | ||
1265 | if (!cmdline_scanner) | |
ad93c40f | 1266 | return m_panic_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1267 | |
0f0c8159 JH |
1268 | /* find scanner output trigger */ |
1269 | cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1270 | "missing trigger specification", &errstr); | |
1271 | if (!cmdline_trigger_re) | |
ad93c40f | 1272 | return m_panic_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1273 | |
0f0c8159 JH |
1274 | /* find scanner name regex */ |
1275 | cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1276 | "missing virus name regex specification", &errstr); | |
1277 | if (!cmdline_regex_re) | |
ad93c40f | 1278 | return m_panic_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1279 | |
0f0c8159 JH |
1280 | /* prepare scanner call; despite the naming, file_name holds a directory |
1281 | name which is documented as the value given to %s. */ | |
b1f8e4f8 | 1282 | |
0f0c8159 JH |
1283 | file_name = string_copy(eml_filename); |
1284 | p = Ustrrchr(file_name, '/'); | |
1285 | if (p) | |
1286 | *p = '\0'; | |
1287 | commandline = string_sprintf(CS cmdline_scanner, file_name); | |
b1f8e4f8 | 1288 | |
0f0c8159 JH |
1289 | /* redirect STDERR too */ |
1290 | commandline = string_sprintf("%s 2>&1", commandline); | |
b1f8e4f8 | 1291 | |
e1d04f48 | 1292 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 | 1293 | scanner_name, commandline); |
b1f8e4f8 | 1294 | |
0f0c8159 JH |
1295 | /* store exims signal handlers */ |
1296 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1297 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
b1f8e4f8 | 1298 | |
0f0c8159 JH |
1299 | if (!(scanner_out = popen(CS commandline,"r"))) |
1300 | { | |
1301 | int err = errno; | |
1302 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1303 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1304 | string_sprintf("call (%s) failed: %s.", commandline, strerror(err))); |
1305 | } | |
1306 | scanner_fd = fileno(scanner_out); | |
94a18f28 | 1307 | |
040721f2 | 1308 | file_name = string_sprintf("%s/%s_scanner_output", eml_dir, message_id); |
b1f8e4f8 | 1309 | |
0f0c8159 JH |
1310 | if (!(scanner_record = modefopen(file_name, "wb", SPOOL_MODE))) |
1311 | { | |
1312 | int err = errno; | |
1313 | (void) pclose(scanner_out); | |
1314 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1315 | return m_panic_defer(scanent, NULL, string_sprintf( |
0f0c8159 JH |
1316 | "opening scanner output file (%s) failed: %s.", |
1317 | file_name, strerror(err))); | |
1318 | } | |
8e669ac1 | 1319 | |
0f0c8159 JH |
1320 | /* look for trigger while recording output */ |
1321 | while ((rcnt = recv_line(scanner_fd, linebuffer, | |
1322 | sizeof(linebuffer), tmo))) | |
1323 | { | |
1324 | if (rcnt < 0) | |
93a6fce2 JH |
1325 | { |
1326 | int err = errno; | |
0f0c8159 JH |
1327 | if (rcnt == -1) |
1328 | break; | |
93a6fce2 JH |
1329 | (void) pclose(scanner_out); |
1330 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1331 | return m_panic_defer(scanent, NULL, string_sprintf( |
93a6fce2 JH |
1332 | "unable to read from scanner (%s): %s", |
1333 | commandline, strerror(err))); | |
1334 | } | |
4e71661f | 1335 | |
0f0c8159 JH |
1336 | if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record)) |
1337 | { | |
1338 | /* short write */ | |
1339 | (void) pclose(scanner_out); | |
1340 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1341 | return m_panic_defer(scanent, NULL, string_sprintf( |
0f0c8159 | 1342 | "short write on scanner output file (%s).", file_name)); |
4e71661f | 1343 | } |
0f0c8159 JH |
1344 | putc('\n', scanner_record); |
1345 | /* try trigger match */ | |
1346 | if ( !trigger | |
1347 | && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1) | |
1348 | ) | |
1349 | trigger = 1; | |
1350 | } | |
8e669ac1 | 1351 | |
0f0c8159 JH |
1352 | (void)fclose(scanner_record); |
1353 | sep = pclose(scanner_out); | |
1354 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1355 | if (sep != 0) | |
ad93c40f | 1356 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1357 | sep == -1 |
1358 | ? string_sprintf("running scanner failed: %s", strerror(sep)) | |
1359 | : string_sprintf("scanner returned error code: %d", sep)); | |
b1f8e4f8 | 1360 | |
0f0c8159 JH |
1361 | if (trigger) |
1362 | { | |
1363 | uschar * s; | |
1364 | /* setup default virus name */ | |
1365 | malware_name = US"unknown"; | |
b1f8e4f8 | 1366 | |
0f0c8159 JH |
1367 | /* re-open the scanner output file, look for name match */ |
1368 | scanner_record = fopen(CS file_name, "rb"); | |
1369 | while (fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) | |
1370 | { | |
1371 | /* try match */ | |
1372 | if ((s = m_pcre_exec(cmdline_regex_re, linebuffer))) | |
1373 | malware_name = s; | |
4e71661f | 1374 | } |
0f0c8159 JH |
1375 | (void)fclose(scanner_record); |
1376 | } | |
1377 | else /* no virus found */ | |
1378 | malware_name = NULL; | |
1379 | break; | |
b1f8e4f8 | 1380 | } /* cmdline */ |
c11d665d | 1381 | #endif |
599dcb77 | 1382 | |
c11d665d | 1383 | #ifndef DISABLE_MAL_SOPHIE |
b1f8e4f8 JH |
1384 | case M_SOPHIE: /* "sophie" scanner type --------------------------------- */ |
1385 | { | |
0f0c8159 JH |
1386 | int bread = 0; |
1387 | uschar *p; | |
1388 | uschar * file_name; | |
1389 | uschar av_buffer[1024]; | |
b1f8e4f8 | 1390 | |
0f0c8159 JH |
1391 | /* pass the scan directory to sophie */ |
1392 | file_name = string_copy(eml_filename); | |
1393 | if ((p = Ustrrchr(file_name, '/'))) | |
1394 | *p = '\0'; | |
b1f8e4f8 | 1395 | |
e1d04f48 | 1396 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 | 1397 | scanner_name, scanner_options); |
b1f8e4f8 | 1398 | |
74f1a423 JH |
1399 | if ( write(malware_daemon_ctx.sock, file_name, Ustrlen(file_name)) < 0 |
1400 | || write(malware_daemon_ctx.sock, "\n", 1) != 1 | |
0f0c8159 | 1401 | ) |
ad93c40f | 1402 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1403 | string_sprintf("unable to write to UNIX socket (%s)", scanner_options), |
74f1a423 | 1404 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1405 | |
0f0c8159 JH |
1406 | /* wait for result */ |
1407 | memset(av_buffer, 0, sizeof(av_buffer)); | |
74f1a423 | 1408 | if ((bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL))) <= 0) |
ad93c40f | 1409 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1410 | string_sprintf("unable to read from UNIX socket (%s)", scanner_options), |
74f1a423 | 1411 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1412 | |
1413 | /* infected ? */ | |
1414 | if (av_buffer[0] == '1') { | |
1415 | uschar * s = Ustrchr(av_buffer, '\n'); | |
1416 | if (s) | |
1417 | *s = '\0'; | |
1418 | malware_name = string_copy(&av_buffer[2]); | |
1419 | } | |
1420 | else if (!strncmp(CS av_buffer, "-1", 2)) | |
ad93c40f | 1421 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1422 | US"scanner reported error", malware_daemon_ctx.sock); |
0f0c8159 JH |
1423 | else /* all ok, no virus */ |
1424 | malware_name = NULL; | |
599dcb77 | 1425 | |
0f0c8159 | 1426 | break; |
8544e77a | 1427 | } |
c11d665d | 1428 | #endif |
8e669ac1 | 1429 | |
c11d665d | 1430 | #ifndef DISABLE_MAL_CLAM |
b1f8e4f8 JH |
1431 | case M_CLAMD: /* "clamd" scanner type ----------------------------------- */ |
1432 | { | |
0f0c8159 JH |
1433 | /* This code was originally contributed by David Saez */ |
1434 | /* There are three scanning methods available to us: | |
1435 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1436 | * (2) Use the STREAM command, send the data on a separate port | |
1437 | * (3) Use the zINSTREAM command, send the data inline | |
1438 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1439 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1440 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
e5ba8aa7 | 1441 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM |
0f0c8159 JH |
1442 | * See Exim bug 926 for details. */ |
1443 | ||
80591636 | 1444 | uschar *p, *vname, *result_tag; |
0f0c8159 | 1445 | int bread=0; |
0f0c8159 JH |
1446 | uschar av_buffer[1024]; |
1447 | uschar *hostname = US""; | |
1448 | host_item connhost; | |
1449 | uschar *clamav_fbuf; | |
1450 | int clam_fd, result; | |
1451 | off_t fsize; | |
1452 | unsigned int fsize_uint; | |
1453 | BOOL use_scan_command = FALSE; | |
8a512ed5 | 1454 | clamd_address * cv[MAX_CLAMD_SERVERS]; |
0f0c8159 | 1455 | int num_servers = 0; |
0f0c8159 | 1456 | uint32_t send_size, send_final_zeroblock; |
4a5cbaff | 1457 | blob cmd_str; |
0f0c8159 | 1458 | |
8a512ed5 JH |
1459 | /*XXX if unixdomain socket, only one server supported. Needs fixing; |
1460 | there's no reason we should not mix local and remote servers */ | |
1461 | ||
0f0c8159 | 1462 | if (*scanner_options == '/') |
8a512ed5 JH |
1463 | { |
1464 | clamd_address * cd; | |
1465 | const uschar * sublist; | |
1466 | int subsep = ' '; | |
1467 | ||
0f0c8159 JH |
1468 | /* Local file; so we def want to use_scan_command and don't want to try |
1469 | * passing IP/port combinations */ | |
1470 | use_scan_command = TRUE; | |
8a512ed5 JH |
1471 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
1472 | ||
1473 | /* extract socket-path part */ | |
1474 | sublist = scanner_options; | |
1475 | cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0); | |
1476 | ||
1477 | /* parse options */ | |
1478 | if (clamd_option(cd, sublist, &subsep) != OK) | |
ad93c40f | 1479 | return m_panic_defer(scanent, NULL, |
8a512ed5 JH |
1480 | string_sprintf("bad option '%s'", scanner_options)); |
1481 | cv[0] = cd; | |
1482 | } | |
0f0c8159 JH |
1483 | else |
1484 | { | |
0f0c8159 JH |
1485 | /* Go through the rest of the list of host/port and construct an array |
1486 | * of servers to try. The first one is the bit we just passed from | |
1487 | * scanner_options so process that first and then scan the remainder of | |
1488 | * the address buffer */ | |
1489 | do | |
4e71661f | 1490 | { |
8a512ed5 JH |
1491 | clamd_address * cd; |
1492 | const uschar * sublist; | |
1493 | int subsep = ' '; | |
1494 | uschar * s; | |
b1f8e4f8 | 1495 | |
0f0c8159 JH |
1496 | /* The 'local' option means use the SCAN command over the network |
1497 | * socket (ie common file storage in use) */ | |
8a512ed5 JH |
1498 | /*XXX we could accept this also as a local option? */ |
1499 | if (strcmpic(scanner_options, US"local") == 0) | |
0f0c8159 JH |
1500 | { |
1501 | use_scan_command = TRUE; | |
1502 | continue; | |
1503 | } | |
b1f8e4f8 | 1504 | |
8a512ed5 | 1505 | cd = (clamd_address *) store_get(sizeof(clamd_address)); |
b1f8e4f8 | 1506 | |
0f0c8159 | 1507 | /* extract host and port part */ |
8a512ed5 JH |
1508 | sublist = scanner_options; |
1509 | if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
1510 | { | |
ad93c40f | 1511 | (void) m_panic_defer(scanent, NULL, |
8a512ed5 JH |
1512 | string_sprintf("missing address: '%s'", scanner_options)); |
1513 | continue; | |
1514 | } | |
1515 | if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
0f0c8159 | 1516 | { |
ad93c40f | 1517 | (void) m_panic_defer(scanent, NULL, |
8a512ed5 JH |
1518 | string_sprintf("missing port: '%s'", scanner_options)); |
1519 | continue; | |
1520 | } | |
93a6fce2 | 1521 | cd->tcp_port = atoi(CS s); |
8a512ed5 JH |
1522 | |
1523 | /* parse options */ | |
1524 | /*XXX should these options be common over scanner types? */ | |
1525 | if (clamd_option(cd, sublist, &subsep) != OK) | |
ad93c40f | 1526 | return m_panic_defer(scanent, NULL, |
8a512ed5 | 1527 | string_sprintf("bad option '%s'", scanner_options)); |
b1f8e4f8 | 1528 | |
8a512ed5 | 1529 | cv[num_servers++] = cd; |
0f0c8159 JH |
1530 | if (num_servers >= MAX_CLAMD_SERVERS) |
1531 | { | |
ad93c40f | 1532 | (void) m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1533 | US"More than " MAX_CLAMD_SERVERS_S " clamd servers " |
1534 | "specified; only using the first " MAX_CLAMD_SERVERS_S ); | |
1535 | break; | |
1536 | } | |
8a512ed5 JH |
1537 | } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep, |
1538 | NULL, 0))); | |
8e669ac1 | 1539 | |
0f0c8159 JH |
1540 | /* check if we have at least one server */ |
1541 | if (!num_servers) | |
ad93c40f | 1542 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1543 | US"no useable server addresses in malware configuration option."); |
1544 | } | |
b1f8e4f8 | 1545 | |
0f0c8159 JH |
1546 | /* See the discussion of response formats below to see why we really |
1547 | don't like colons in filenames when passing filenames to ClamAV. */ | |
1548 | if (use_scan_command && Ustrchr(eml_filename, ':')) | |
ad93c40f | 1549 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1550 | string_sprintf("local/SCAN mode incompatible with" \ |
1551 | " : in path to email filename [%s]", eml_filename)); | |
b1f8e4f8 | 1552 | |
4a5cbaff JH |
1553 | /* Set up the very first data we will be sending */ |
1554 | if (!use_scan_command) | |
4a5cbaff | 1555 | { cmd_str.data = US"zINSTREAM"; cmd_str.len = 10; } |
4a5cbaff JH |
1556 | else |
1557 | { | |
1558 | cmd_str.data = string_sprintf("SCAN %s\n", eml_filename); | |
1559 | cmd_str.len = Ustrlen(cmd_str.data); | |
1560 | } | |
1561 | ||
0f0c8159 JH |
1562 | /* We have some network servers specified */ |
1563 | if (num_servers) | |
1564 | { | |
1565 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd | |
1566 | * only supports AF_INET, but we should probably be looking to the | |
1567 | * future and rewriting this to be protocol-independent anyway. */ | |
b1f8e4f8 | 1568 | |
0f0c8159 JH |
1569 | while (num_servers > 0) |
1570 | { | |
4a5cbaff | 1571 | int i = random_number(num_servers); |
8a512ed5 | 1572 | clamd_address * cd = cv[i]; |
b1f8e4f8 | 1573 | |
e1d04f48 | 1574 | DEBUG(D_acl) debug_printf_indent("trying server name %s, port %u\n", |
8a512ed5 | 1575 | cd->hostspec, cd->tcp_port); |
0f0c8159 JH |
1576 | |
1577 | /* Lookup the host. This is to ensure that we connect to the same IP | |
1578 | * on both connections (as one host could resolve to multiple ips) */ | |
8a512ed5 | 1579 | for (;;) |
0f0c8159 | 1580 | { |
74f1a423 | 1581 | if ((malware_daemon_ctx.sock = m_tcpsocket(cd->hostspec, cd->tcp_port, |
4a5cbaff | 1582 | &connhost, &errstr, &cmd_str)) >= 0) |
8a512ed5 JH |
1583 | { |
1584 | /* Connection successfully established with a server */ | |
1585 | hostname = cd->hostspec; | |
4a5cbaff | 1586 | cmd_str.len = 0; |
8a512ed5 JH |
1587 | break; |
1588 | } | |
1589 | if (cd->retry <= 0) break; | |
1590 | while (cd->retry > 0) cd->retry = sleep(cd->retry); | |
4e71661f | 1591 | } |
74f1a423 | 1592 | if (malware_daemon_ctx.sock >= 0) |
8a512ed5 | 1593 | break; |
b1f8e4f8 | 1594 | |
ad93c40f | 1595 | (void) m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1596 | |
1597 | /* Remove the server from the list. XXX We should free the memory */ | |
1598 | num_servers--; | |
8a512ed5 JH |
1599 | for (; i < num_servers; i++) |
1600 | cv[i] = cv[i+1]; | |
4e71661f | 1601 | } |
8e669ac1 | 1602 | |
0f0c8159 | 1603 | if (num_servers == 0) |
ad93c40f | 1604 | return m_panic_defer(scanent, NULL, US"all servers failed"); |
0f0c8159 JH |
1605 | } |
1606 | else | |
8a512ed5 JH |
1607 | for (;;) |
1608 | { | |
74f1a423 | 1609 | if ((malware_daemon_ctx.sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0) |
8a512ed5 JH |
1610 | { |
1611 | hostname = cv[0]->hostspec; | |
1612 | break; | |
1613 | } | |
1614 | if (cv[0]->retry <= 0) | |
ad93c40f | 1615 | return m_panic_defer(scanent, CUS callout_address, errstr); |
8a512ed5 JH |
1616 | while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry); |
1617 | } | |
b1f8e4f8 | 1618 | |
0f0c8159 JH |
1619 | /* have socket in variable "sock"; command to use is semi-independent of |
1620 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1621 | * domain socket, or explicitly told local) else we stream the data. | |
1622 | * How we stream the data depends upon how we were built. */ | |
1623 | ||
1624 | if (!use_scan_command) | |
1625 | { | |
0f0c8159 JH |
1626 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> |
1627 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1628 | chunk. */ | |
b1f8e4f8 | 1629 | |
e1d04f48 | 1630 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
1631 | "Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", |
1632 | scanner_name); | |
b1f8e4f8 | 1633 | |
4a5cbaff JH |
1634 | /* Pass the string to ClamAV (10 = "zINSTREAM\0"), if not already sent */ |
1635 | if (cmd_str.len) | |
74f1a423 | 1636 | if (send(malware_daemon_ctx.sock, cmd_str.data, cmd_str.len, 0) < 0) |
ad93c40f | 1637 | return m_panic_defer_3(scanent, CUS hostname, |
4a5cbaff JH |
1638 | string_sprintf("unable to send zINSTREAM to socket (%s)", |
1639 | strerror(errno)), | |
74f1a423 | 1640 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1641 | |
0f0c8159 JH |
1642 | /* calc file size */ |
1643 | if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) | |
1644 | { | |
1645 | int err = errno; | |
ad93c40f | 1646 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1647 | string_sprintf("can't open spool file %s: %s", |
1648 | eml_filename, strerror(err)), | |
74f1a423 | 1649 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1650 | } |
1651 | if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) | |
1652 | { | |
d315eda1 JH |
1653 | int err; |
1654 | b_seek: err = errno; | |
e5ba8aa7 | 1655 | (void)close(clam_fd); |
ad93c40f | 1656 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1657 | string_sprintf("can't seek spool file %s: %s", |
1658 | eml_filename, strerror(err)), | |
74f1a423 | 1659 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1660 | } |
1661 | fsize_uint = (unsigned int) fsize; | |
1662 | if ((off_t)fsize_uint != fsize) | |
1663 | { | |
e5ba8aa7 | 1664 | (void)close(clam_fd); |
ad93c40f | 1665 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1666 | string_sprintf("seeking spool file %s, size overflow", |
1667 | eml_filename), | |
74f1a423 | 1668 | malware_daemon_ctx.sock); |
0f0c8159 | 1669 | } |
d315eda1 JH |
1670 | if (lseek(clam_fd, 0, SEEK_SET) < 0) |
1671 | goto b_seek; | |
b1f8e4f8 | 1672 | |
40c90bca | 1673 | if (!(clamav_fbuf = US malloc(fsize_uint))) |
0f0c8159 | 1674 | { |
e5ba8aa7 | 1675 | (void)close(clam_fd); |
ad93c40f | 1676 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1677 | string_sprintf("unable to allocate memory %u for file (%s)", |
1678 | fsize_uint, eml_filename), | |
74f1a423 | 1679 | malware_daemon_ctx.sock); |
0f0c8159 | 1680 | } |
b1f8e4f8 | 1681 | |
0f0c8159 JH |
1682 | if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0) |
1683 | { | |
1684 | int err = errno; | |
e5ba8aa7 | 1685 | free(clamav_fbuf); (void)close(clam_fd); |
ad93c40f | 1686 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1687 | string_sprintf("can't read spool file %s: %s", |
1688 | eml_filename, strerror(err)), | |
74f1a423 | 1689 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1690 | } |
1691 | (void)close(clam_fd); | |
b1f8e4f8 | 1692 | |
0f0c8159 | 1693 | /* send file body to socket */ |
0f0c8159 JH |
1694 | send_size = htonl(fsize_uint); |
1695 | send_final_zeroblock = 0; | |
74f1a423 JH |
1696 | if ((send(malware_daemon_ctx.sock, &send_size, sizeof(send_size), 0) < 0) || |
1697 | (send(malware_daemon_ctx.sock, clamav_fbuf, fsize_uint, 0) < 0) || | |
1698 | (send(malware_daemon_ctx.sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
0f0c8159 | 1699 | { |
b1f8e4f8 | 1700 | free(clamav_fbuf); |
ad93c40f | 1701 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 | 1702 | string_sprintf("unable to send file body to socket (%s)", hostname), |
74f1a423 | 1703 | malware_daemon_ctx.sock); |
4e71661f | 1704 | } |
b1f8e4f8 | 1705 | |
0f0c8159 | 1706 | free(clamav_fbuf); |
0f0c8159 JH |
1707 | } |
1708 | else | |
1709 | { /* use scan command */ | |
1710 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1711 | * scan-method-neutral part, read the response back */ | |
1712 | ||
1713 | /* ================================================================= */ | |
1714 | ||
1715 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1716 | which dates to when ClamAV needed us to break apart the email into the | |
1717 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1718 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1719 | doing this would actually have resulted in the mail attachments being | |
1720 | scanned twice, in the broken out files and from the original .eml. | |
1721 | Since ClamAV now handles emails (and has for quite some time) we can | |
1722 | just use the email file itself. */ | |
4a5cbaff | 1723 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0), if not already sent */ |
0f0c8159 | 1724 | |
e1d04f48 | 1725 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
1726 | "Malware scan: issuing %s local-path scan [%s]\n", |
1727 | scanner_name, scanner_options); | |
b1f8e4f8 | 1728 | |
4a5cbaff | 1729 | if (cmd_str.len) |
74f1a423 | 1730 | if (send(malware_daemon_ctx.sock, cmd_str.data, cmd_str.len, 0) < 0) |
ad93c40f | 1731 | return m_panic_defer_3(scanent, CUS callout_address, |
4a5cbaff | 1732 | string_sprintf("unable to write to socket (%s)", strerror(errno)), |
74f1a423 | 1733 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1734 | |
0f0c8159 JH |
1735 | /* Do not shut down the socket for writing; a user report noted that |
1736 | * clamd 0.70 does not react well to this. */ | |
1737 | } | |
1738 | /* Commands have been sent, no matter which scan method or connection | |
1739 | * type we're using; now just read the result, independent of method. */ | |
1740 | ||
1741 | /* Read the result */ | |
1742 | memset(av_buffer, 0, sizeof(av_buffer)); | |
74f1a423 JH |
1743 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); |
1744 | (void)close(malware_daemon_ctx.sock); | |
1745 | malware_daemon_ctx.sock = -1; | |
1746 | malware_daemon_ctx.tls_ctx = NULL; | |
0f0c8159 JH |
1747 | |
1748 | if (bread <= 0) | |
ad93c40f | 1749 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1750 | string_sprintf("unable to read from socket (%s)", |
1751 | errno == 0 ? "EOF" : strerror(errno))); | |
1752 | ||
1753 | if (bread == sizeof(av_buffer)) | |
ad93c40f | 1754 | return m_panic_defer(scanent, CUS callout_address, |
0ea02355 | 1755 | US"buffer too small"); |
0f0c8159 JH |
1756 | /* We're now assured of a NULL at the end of av_buffer */ |
1757 | ||
1758 | /* Check the result. ClamAV returns one of two result formats. | |
1759 | In the basic mode, the response is of the form: | |
1760 | infected: -> "<filename>: <virusname> FOUND" | |
1761 | not-infected: -> "<filename>: OK" | |
1762 | error: -> "<filename>: <errcode> ERROR | |
1763 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1764 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1765 | for the infected case. Compare: | |
1766 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1767 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1768 | ||
1769 | In the streaming case, clamd uses the filename "stream" which you should | |
1770 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1771 | client app will replace "stream" with the original filename before returning | |
1772 | results to stdout, but the trace shows the data). | |
1773 | ||
1774 | We will assume that the pathname passed to clamd from Exim does not contain | |
1775 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1776 | passing a filename to clamd). */ | |
1777 | ||
1778 | if (!(*av_buffer)) | |
ad93c40f | 1779 | return m_panic_defer(scanent, CUS callout_address, |
0ea02355 | 1780 | US"ClamAV returned null"); |
0f0c8159 JH |
1781 | |
1782 | /* strip newline at the end (won't be present for zINSTREAM) | |
1783 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1784 | this below, so double-check) */ | |
1785 | p = av_buffer + Ustrlen(av_buffer) - 1; | |
1786 | if (*p == '\n') *p = '\0'; | |
1787 | ||
e1d04f48 | 1788 | DEBUG(D_acl) debug_printf_indent("Malware response: %s\n", av_buffer); |
0f0c8159 JH |
1789 | |
1790 | while (isspace(*--p) && (p > av_buffer)) | |
1791 | *p = '\0'; | |
1792 | if (*p) ++p; | |
0f0c8159 JH |
1793 | |
1794 | /* colon in returned output? */ | |
80591636 | 1795 | if(!(p = Ustrchr(av_buffer,':'))) |
ad93c40f | 1796 | return m_panic_defer(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
1797 | "ClamAV returned malformed result (missing colon): %s", |
1798 | av_buffer)); | |
1799 | ||
1800 | /* strip filename */ | |
1801 | while (*p && isspace(*++p)) /**/; | |
1802 | vname = p; | |
1803 | ||
1804 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1805 | but we should at least be resistant to it. */ | |
1806 | p = Ustrrchr(vname, ' '); | |
1807 | result_tag = p ? p+1 : vname; | |
1808 | ||
1809 | if (Ustrcmp(result_tag, "FOUND") == 0) | |
1810 | { | |
1811 | /* p should still be the whitespace before the result_tag */ | |
1812 | while (isspace(*p)) --p; | |
1813 | *++p = '\0'; | |
1814 | /* Strip off the extended information too, which will be in parens | |
1815 | after the virus name, with no intervening whitespace. */ | |
1816 | if (*--p == ')') | |
4e71661f | 1817 | { |
0f0c8159 JH |
1818 | /* "(hash:size)", so previous '(' will do; if not found, we have |
1819 | a curious virus name, but not an error. */ | |
1820 | p = Ustrrchr(vname, '('); | |
1821 | if (p) | |
1822 | *p = '\0'; | |
4e71661f | 1823 | } |
0f0c8159 | 1824 | malware_name = string_copy(vname); |
e1d04f48 | 1825 | DEBUG(D_acl) debug_printf_indent("Malware found, name \"%s\"\n", malware_name); |
b1f8e4f8 | 1826 | |
0f0c8159 JH |
1827 | } |
1828 | else if (Ustrcmp(result_tag, "ERROR") == 0) | |
ad93c40f | 1829 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 | 1830 | string_sprintf("ClamAV returned: %s", av_buffer)); |
b1f8e4f8 | 1831 | |
0f0c8159 JH |
1832 | else if (Ustrcmp(result_tag, "OK") == 0) |
1833 | { | |
1834 | /* Everything should be OK */ | |
1835 | malware_name = NULL; | |
e1d04f48 | 1836 | DEBUG(D_acl) debug_printf_indent("Malware not found\n"); |
b1f8e4f8 | 1837 | |
0f0c8159 JH |
1838 | } |
1839 | else | |
ad93c40f | 1840 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1841 | string_sprintf("unparseable response from ClamAV: {%s}", av_buffer)); |
1842 | ||
1843 | break; | |
b1f8e4f8 | 1844 | } /* clamd */ |
c11d665d | 1845 | #endif |
b1f8e4f8 | 1846 | |
c11d665d | 1847 | #ifndef DISABLE_MAL_SOCK |
b1f8e4f8 | 1848 | case M_SOCK: /* "sock" scanner type ------------------------------------- */ |
0f0c8159 JH |
1849 | /* This code was derived by Martin Poole from the clamd code contributed |
1850 | by David Saez and the cmdline code | |
1851 | */ | |
b1f8e4f8 | 1852 | { |
0f0c8159 JH |
1853 | int bread; |
1854 | uschar * commandline; | |
1855 | uschar av_buffer[1024]; | |
1856 | uschar * linebuffer; | |
1857 | uschar * sockline_scanner; | |
1858 | uschar sockline_scanner_default[] = "%s\n"; | |
1859 | const pcre *sockline_trig_re; | |
1860 | const pcre *sockline_name_re; | |
1861 | ||
1862 | /* find scanner command line */ | |
ac4d558b JH |
1863 | if ( (sockline_scanner = string_nextinlist(&av_scanner_work, &sep, |
1864 | NULL, 0)) | |
1865 | && *sockline_scanner | |
1866 | ) | |
0f0c8159 JH |
1867 | { /* check for no expansions apart from one %s */ |
1868 | uschar * s = Ustrchr(sockline_scanner, '%'); | |
1869 | if (s++) | |
1870 | if ((*s != 's' && *s != '%') || Ustrchr(s+1, '%')) | |
ad93c40f | 1871 | return m_panic_defer_3(scanent, NULL, |
74f1a423 | 1872 | US"unsafe sock scanner call spec", malware_daemon_ctx.sock); |
0f0c8159 JH |
1873 | } |
1874 | else | |
1875 | sockline_scanner = sockline_scanner_default; | |
ac4d558b JH |
1876 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "cmdline: ", |
1877 | string_printing(sockline_scanner)); | |
b1f8e4f8 | 1878 | |
0f0c8159 JH |
1879 | /* find scanner output trigger */ |
1880 | sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1881 | "missing trigger specification", &errstr); | |
1882 | if (!sockline_trig_re) | |
74f1a423 | 1883 | return m_panic_defer_3(scanent, NULL, errstr, malware_daemon_ctx.sock); |
b1f8e4f8 | 1884 | |
0f0c8159 JH |
1885 | /* find virus name regex */ |
1886 | sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1887 | "missing virus name regex specification", &errstr); | |
1888 | if (!sockline_name_re) | |
74f1a423 | 1889 | return m_panic_defer_3(scanent, NULL, errstr, malware_daemon_ctx.sock); |
b1f8e4f8 | 1890 | |
0f0c8159 | 1891 | /* prepare scanner call - security depends on expansions check above */ |
040721f2 | 1892 | commandline = string_sprintf( CS sockline_scanner, CS eml_filename); |
ac4d558b JH |
1893 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "expanded: ", |
1894 | string_printing(commandline)); | |
b1f8e4f8 | 1895 | |
0f0c8159 | 1896 | /* Pass the command string to the socket */ |
74f1a423 | 1897 | if (m_sock_send(malware_daemon_ctx.sock, commandline, Ustrlen(commandline), &errstr) < 0) |
ad93c40f | 1898 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1899 | |
0f0c8159 | 1900 | /* Read the result */ |
74f1a423 | 1901 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo-time(NULL)); |
b1f8e4f8 | 1902 | |
0f0c8159 | 1903 | if (bread <= 0) |
ad93c40f | 1904 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1905 | string_sprintf("unable to read from socket (%s)", strerror(errno)), |
74f1a423 | 1906 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1907 | |
0f0c8159 | 1908 | if (bread == sizeof(av_buffer)) |
ad93c40f | 1909 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1910 | US"buffer too small", malware_daemon_ctx.sock); |
0f0c8159 JH |
1911 | av_buffer[bread] = '\0'; |
1912 | linebuffer = string_copy(av_buffer); | |
ac4d558b JH |
1913 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "answer: ", |
1914 | string_printing(linebuffer)); | |
b1f8e4f8 | 1915 | |
0f0c8159 JH |
1916 | /* try trigger match */ |
1917 | if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) | |
1918 | { | |
1919 | if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer))) | |
1920 | malware_name = US "unknown"; | |
ac4d558b JH |
1921 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "name: ", |
1922 | string_printing(malware_name)); | |
b1f8e4f8 | 1923 | } |
0f0c8159 JH |
1924 | else /* no virus found */ |
1925 | malware_name = NULL; | |
1926 | break; | |
8523533c | 1927 | } |
c11d665d | 1928 | #endif |
8e669ac1 | 1929 | |
c11d665d | 1930 | #ifndef DISABLE_MAL_MKS |
b1f8e4f8 JH |
1931 | case M_MKSD: /* "mksd" scanner type ------------------------------------- */ |
1932 | { | |
0f0c8159 JH |
1933 | char *mksd_options_end; |
1934 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1935 | int retval; | |
b1f8e4f8 | 1936 | |
0f0c8159 JH |
1937 | if (scanner_options) |
1938 | { | |
1939 | mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10); | |
1940 | if ( *scanner_options == '\0' | |
1941 | || *mksd_options_end != '\0' | |
1942 | || mksd_maxproc < 1 | |
1943 | || mksd_maxproc > 32 | |
1944 | ) | |
ad93c40f | 1945 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1946 | string_sprintf("invalid option '%s'", scanner_options)); |
1947 | } | |
8e669ac1 | 1948 | |
74f1a423 | 1949 | if((malware_daemon_ctx.sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0) |
ad93c40f | 1950 | return m_panic_defer(scanent, CUS callout_address, errstr); |
8e669ac1 | 1951 | |
0f0c8159 | 1952 | malware_name = NULL; |
94a18f28 | 1953 | |
e1d04f48 | 1954 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan\n", scanner_name); |
94a18f28 | 1955 | |
74f1a423 | 1956 | if ((retval = mksd_scan_packed(scanent, malware_daemon_ctx.sock, eml_filename, tmo)) != OK) |
0f0c8159 | 1957 | { |
74f1a423 | 1958 | close (malware_daemon_ctx.sock); |
0f0c8159 JH |
1959 | return retval; |
1960 | } | |
1961 | break; | |
8523533c | 1962 | } |
c11d665d | 1963 | #endif |
0f0c8159 | 1964 | |
c11d665d | 1965 | #ifndef DISABLE_MAL_AVAST |
b6fbf22d JH |
1966 | case M_AVAST: /* "avast" scanner type ----------------------------------- */ |
1967 | { | |
b6fbf22d JH |
1968 | uschar buf[1024]; |
1969 | uschar * scanrequest; | |
b6fbf22d | 1970 | enum {AVA_HELO, AVA_OPT, AVA_RSP, AVA_DONE} avast_stage; |
0f0c8159 | 1971 | int nread; |
ad93c40f | 1972 | uschar * error_message = NULL; |
4fe93c4b HSHR |
1973 | BOOL more_data = FALSE; |
1974 | BOOL strict = TRUE; | |
b6fbf22d JH |
1975 | |
1976 | /* According to Martin Tuma @avast the protocol uses "escaped | |
1977 | whitespace", that is, every embedded whitespace is backslash | |
1978 | escaped, as well as backslash is protected by backslash. | |
1979 | The returned lines contain the name of the scanned file, a tab | |
1980 | and the [ ] marker. | |
1981 | [+] - not infected | |
1982 | [L] - infected | |
1983 | [E] - some error occured | |
71bb51e0 HSHR |
1984 | Such marker follows the first non-escaped TAB. For more information |
1985 | see avast-protocol(5) | |
ad93c40f HSHR |
1986 | |
1987 | We observed two cases: | |
1988 | -> SCAN /file | |
1989 | <- /file [E]0.0 Error 13 Permission denied | |
1990 | <- 451 SCAN Engine error 13 permission denied | |
1991 | ||
1992 | -> SCAN /file | |
1993 | <- /file… [E]3.0 Error 41120 The file is a decompression bomb | |
1994 | <- /file… [+]2.0 | |
1995 | <- /file… [+]2.0 0 Eicar Test Virus!!! | |
1996 | <- 200 SCAN OK | |
1997 | ||
1998 | If the scanner returns 4xx, DEFER is a good decision, combined | |
1999 | with a panic log entry, to get the admin's attention. | |
2000 | ||
2001 | If the scanner returns 200, we reject it as malware, if found any, | |
2002 | or, in case of an error, we set the malware message to the error | |
2003 | string. | |
2004 | ||
2005 | Some of the >= 42000 errors are message related - usually some | |
2006 | broken archives etc, but some of them are e.g. license related. | |
2007 | Once the license expires the engine starts returning errors for | |
2008 | every scanning attempt. I¹ have the full list of the error codes | |
2009 | but it is not a public API and is subject to change. It is hard | |
2010 | for me to say what you should do in case of an engine error. You | |
2011 | can have a “Treat * unscanned file as infection” policy or “Treat | |
2012 | unscanned file as clean” policy. ¹) Jakub Bednar | |
2013 | ||
2014 | */ | |
2015 | ||
476be7e2 JH |
2016 | if ( ( !ava_re_clean |
2017 | && !(ava_re_clean = m_pcre_compile(ava_re_clean_str, &errstr))) | |
2018 | || ( !ava_re_virus | |
2019 | && !(ava_re_virus = m_pcre_compile(ava_re_virus_str, &errstr))) | |
ad93c40f HSHR |
2020 | || ( !ava_re_error |
2021 | && !(ava_re_error = m_pcre_compile(ava_re_error_str, &errstr))) | |
b6fbf22d | 2022 | ) |
ad93c40f | 2023 | return malware_panic_defer(errstr); |
b6fbf22d JH |
2024 | |
2025 | /* wait for result */ | |
0f0c8159 | 2026 | for (avast_stage = AVA_HELO; |
74f1a423 | 2027 | (nread = recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo)) > 0; |
0f0c8159 | 2028 | ) |
b6fbf22d JH |
2029 | { |
2030 | int slen = Ustrlen(buf); | |
94431adb | 2031 | if (slen >= 1) |
b6fbf22d | 2032 | { |
71bb51e0 HSHR |
2033 | |
2034 | /* Multi line responses are bracketed between 210 … and nnn … */ | |
2035 | if (Ustrncmp(buf, "210", 3) == 0) | |
2036 | { | |
2037 | more_data = 1; | |
2038 | continue; | |
2039 | } | |
2040 | else if (more_data && isdigit(buf[0])) more_data = 0; | |
2041 | ||
b6fbf22d JH |
2042 | switch (avast_stage) |
2043 | { | |
2044 | case AVA_HELO: | |
71bb51e0 | 2045 | if (more_data) continue; |
b6fbf22d JH |
2046 | if (Ustrncmp(buf, "220", 3) != 0) |
2047 | goto endloop; /* require a 220 */ | |
2048 | goto sendreq; | |
2049 | ||
2050 | case AVA_OPT: | |
71bb51e0 | 2051 | if (more_data) continue; |
b6fbf22d JH |
2052 | if (Ustrncmp(buf, "200", 3) != 0) |
2053 | goto endloop; /* require a 200 */ | |
2054 | ||
2055 | sendreq: | |
2056 | { | |
2057 | int len; | |
2058 | /* Check for another option to send. Newline-terminate it. */ | |
2059 | if ((scanrequest = string_nextinlist(&av_scanner_work, &sep, | |
2060 | NULL, 0))) | |
2061 | { | |
eb445b04 HSHR |
2062 | if (Ustrcmp(scanrequest, "pass_unscanned") == 0) |
2063 | { | |
2064 | DEBUG(D_acl) debug_printf_indent("pass unscanned files as clean\n"); | |
2065 | strict = FALSE; | |
2066 | goto sendreq; | |
2067 | } | |
b6fbf22d JH |
2068 | scanrequest = string_sprintf("%s\n", scanrequest); |
2069 | avast_stage = AVA_OPT; /* just sent option */ | |
71bb51e0 | 2070 | DEBUG(D_acl) debug_printf_indent("send to avast OPTION: %s", scanrequest); |
b6fbf22d JH |
2071 | } |
2072 | else | |
2073 | { | |
040721f2 | 2074 | scanrequest = string_sprintf("SCAN %s\n", eml_dir); |
b6fbf22d | 2075 | avast_stage = AVA_RSP; /* just sent command */ |
71bb51e0 | 2076 | DEBUG(D_acl) debug_printf_indent("send to avast REQUEST: SCAN %s\n", eml_dir); |
b6fbf22d JH |
2077 | } |
2078 | ||
2079 | /* send config-cmd or scan-request to socket */ | |
2080 | len = Ustrlen(scanrequest); | |
74f1a423 | 2081 | if (send(malware_daemon_ctx.sock, scanrequest, len, 0) == -1) |
b6fbf22d JH |
2082 | { |
2083 | scanrequest[len-1] = '\0'; | |
ad93c40f | 2084 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
b6fbf22d | 2085 | "unable to send request '%s' to socket (%s): %s", |
74f1a423 | 2086 | scanrequest, scanner_options, strerror(errno)), malware_daemon_ctx.sock); |
b6fbf22d JH |
2087 | } |
2088 | break; | |
2089 | } | |
2090 | ||
2091 | case AVA_RSP: | |
71bb51e0 | 2092 | |
91e974f5 | 2093 | if (isdigit(buf[0])) /* We're done */ |
71bb51e0 | 2094 | goto endloop; |
71bb51e0 | 2095 | |
91e974f5 | 2096 | if (malware_name) /* Nothing else matters, just read on */ |
ad93c40f | 2097 | break; |
b6fbf22d | 2098 | |
91e974f5 | 2099 | if (pcre_exec(ava_re_clean, NULL, CS buf, slen, 0, 0, NULL, 0) == 0) |
b6fbf22d JH |
2100 | break; |
2101 | ||
4fe93c4b | 2102 | if ((malware_name = m_pcre_exec(ava_re_virus, buf))) |
ad93c40f HSHR |
2103 | { |
2104 | unescape(malware_name); | |
2105 | DEBUG(D_acl) | |
2106 | debug_printf_indent("unescaped malware name: '%s'\n", malware_name); | |
2107 | break; | |
2108 | } | |
2109 | ||
91e974f5 | 2110 | if (strict) /* treat scanner errors as malware */ |
ad93c40f | 2111 | { |
4fe93c4b | 2112 | if ((malware_name = m_pcre_exec(ava_re_error, buf))) |
91e974f5 HSHR |
2113 | { |
2114 | unescape(malware_name); | |
2115 | DEBUG(D_acl) | |
2116 | debug_printf_indent("unescaped error message: '%s'\n", malware_name); | |
2117 | break; | |
2118 | } | |
ad93c40f | 2119 | } |
91e974f5 | 2120 | else if (pcre_exec(ava_re_error, NULL, CS buf, slen, 0, 0, NULL, 0) == 0) |
eb445b04 HSHR |
2121 | { |
2122 | log_write(0, LOG_MAIN, "internal scanner error (ignored): %s", buf); | |
2123 | break; | |
2124 | } | |
2125 | ||
83d2a861 | 2126 | /* here also for any unexpected response from the scanner */ |
eb445b04 | 2127 | DEBUG(D_acl) debug_printf("avast response not handled: '%s'\n", buf); |
91e974f5 | 2128 | |
b6fbf22d | 2129 | goto endloop; |
755762fd | 2130 | |
83d2a861 | 2131 | default: log_write(0, LOG_PANIC, "%s:%d:%s: should not happen", |
755762fd | 2132 | __FILE__, __LINE__, __FUNCTION__); |
b6fbf22d | 2133 | } |
0f0c8159 | 2134 | } |
b6fbf22d | 2135 | } |
91e974f5 | 2136 | |
b6fbf22d JH |
2137 | endloop: |
2138 | ||
46682a67 JH |
2139 | if (nread == -1) error_message = US"EOF from scanner"; |
2140 | else if (nread < 0) error_message = US"timeout from scanner"; | |
2141 | else if (nread == 0) error_message = US"got nothing from scanner"; | |
91e974f5 | 2142 | else if (buf[0] != '2') error_message = buf; |
ad93c40f | 2143 | |
91e974f5 | 2144 | DEBUG(D_acl) debug_printf_indent("sent to avast QUIT\n"); |
74f1a423 | 2145 | if (send(malware_daemon_ctx.sock, "QUIT\n", 5, 0) == -1) |
91e974f5 HSHR |
2146 | return m_panic_defer_3(scanent, CUS callout_address, |
2147 | string_sprintf("unable to send quit request to socket (%s): %s", | |
74f1a423 | 2148 | scanner_options, strerror(errno)), malware_daemon_ctx.sock); |
91e974f5 HSHR |
2149 | |
2150 | if (error_message) | |
74f1a423 | 2151 | return m_panic_defer_3(scanent, CUS callout_address, error_message, malware_daemon_ctx.sock); |
ad93c40f | 2152 | |
b6fbf22d | 2153 | } |
c11d665d | 2154 | #endif |
0f0c8159 | 2155 | } /* scanner type switch */ |
8523533c | 2156 | |
74f1a423 JH |
2157 | if (malware_daemon_ctx.sock >= 0) |
2158 | (void) close (malware_daemon_ctx.sock); | |
0f0c8159 | 2159 | malware_ok = TRUE; /* set "been here, done that" marker */ |
b1f8e4f8 | 2160 | } |
8523533c | 2161 | |
0f0c8159 JH |
2162 | /* match virus name against pattern (caseless ------->----------v) */ |
2163 | if (malware_name && regex_match_and_setup(re, malware_name, 0, -1)) | |
2164 | { | |
e1d04f48 | 2165 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
2166 | "Matched regex to malware [%s] [%s]\n", malware_re, malware_name); |
2167 | return OK; | |
2168 | } | |
2169 | else | |
2170 | return FAIL; | |
8523533c TK |
2171 | } |
2172 | ||
2173 | ||
0f0c8159 JH |
2174 | /************************************************* |
2175 | * Scan an email for malware * | |
2176 | *************************************************/ | |
8523533c | 2177 | |
0f0c8159 JH |
2178 | /* This is the normal interface for scanning an email, which doesn't need a |
2179 | filename; it's a wrapper around the malware_file function. | |
8523533c | 2180 | |
0f0c8159 JH |
2181 | Arguments: |
2182 | malware_re match condition for "malware=" | |
2183 | timeout if nonzero, timeout in seconds | |
2184 | ||
2185 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
2186 | where true means malware was found (condition applies) | |
2187 | */ | |
2188 | int | |
2189 | malware(const uschar * malware_re, int timeout) | |
8523533c | 2190 | { |
040721f2 | 2191 | int ret = malware_internal(malware_re, NULL, timeout); |
8e669ac1 | 2192 | |
55240832 | 2193 | if (ret == DEFER) av_failed = TRUE; |
55240832 | 2194 | return ret; |
8523533c TK |
2195 | } |
2196 | ||
8e669ac1 | 2197 | |
0f0c8159 JH |
2198 | /************************************************* |
2199 | * Scan a file for malware * | |
2200 | *************************************************/ | |
8e669ac1 | 2201 | |
0f0c8159 JH |
2202 | /* This is a test wrapper for scanning an email, which is not used in |
2203 | normal processing. Scan any file, using the Exim scanning interface. | |
2204 | This function tampers with various global variables so is unsafe to use | |
2205 | in any other context. | |
8e669ac1 | 2206 | |
0f0c8159 JH |
2207 | Arguments: |
2208 | eml_filename a file holding the message to be scanned | |
8523533c | 2209 | |
0f0c8159 JH |
2210 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) |
2211 | where true means malware was found (condition applies) | |
2212 | */ | |
2213 | int | |
2214 | malware_in_file(uschar *eml_filename) | |
8523533c | 2215 | { |
55240832 JH |
2216 | uschar message_id_buf[64]; |
2217 | int ret; | |
2218 | ||
2219 | /* spool_mbox() assumes various parameters exist, when creating | |
2220 | the relevant directory and the email within */ | |
2221 | ||
2222 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
2223 | "dummy-%d", vaguely_random_number(INT_MAX)); | |
2224 | message_id = message_id_buf; | |
2225 | sender_address = US"malware-sender@example.net"; | |
2226 | return_path = US""; | |
2227 | recipients_list = NULL; | |
2228 | receive_add_recipient(US"malware-victim@example.net", -1); | |
2229 | enable_dollar_recipients = TRUE; | |
2230 | ||
040721f2 | 2231 | ret = malware_internal(US"*", eml_filename, 0); |
55240832 JH |
2232 | |
2233 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); | |
2234 | spool_mbox_ok = 1; | |
2235 | ||
2236 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
2237 | set, but if that changes, then it should apply to these tests too */ | |
2238 | ||
2239 | unspool_mbox(); | |
2240 | ||
2241 | /* silence static analysis tools */ | |
2242 | message_id = NULL; | |
2243 | ||
2244 | return ret; | |
8523533c TK |
2245 | } |
2246 | ||
476be7e2 JH |
2247 | |
2248 | void | |
2249 | malware_init(void) | |
2250 | { | |
2251 | if (!malware_default_re) | |
2252 | malware_default_re = regex_must_compile(malware_regex_default, FALSE, TRUE); | |
c11d665d JH |
2253 | |
2254 | #ifndef DISABLE_MAL_DRWEB | |
476be7e2 JH |
2255 | if (!drweb_re) |
2256 | drweb_re = regex_must_compile(drweb_re_str, FALSE, TRUE); | |
c11d665d JH |
2257 | #endif |
2258 | #ifndef DISABLE_MAL_FSECURE | |
476be7e2 JH |
2259 | if (!fsec_re) |
2260 | fsec_re = regex_must_compile(fsec_re_str, FALSE, TRUE); | |
c11d665d JH |
2261 | #endif |
2262 | #ifndef DISABLE_MAL_KAV | |
476be7e2 JH |
2263 | if (!kav_re_sus) |
2264 | kav_re_sus = regex_must_compile(kav_re_sus_str, FALSE, TRUE); | |
2265 | if (!kav_re_inf) | |
2266 | kav_re_inf = regex_must_compile(kav_re_inf_str, FALSE, TRUE); | |
c11d665d | 2267 | #endif |
fd5a6ffb | 2268 | #ifndef DISABLE_MAL_AVAST |
476be7e2 JH |
2269 | if (!ava_re_clean) |
2270 | ava_re_clean = regex_must_compile(ava_re_clean_str, FALSE, TRUE); | |
2271 | if (!ava_re_virus) | |
2272 | ava_re_virus = regex_must_compile(ava_re_virus_str, FALSE, TRUE); | |
ad93c40f HSHR |
2273 | if (!ava_re_error) |
2274 | ava_re_error = regex_must_compile(ava_re_error_str, FALSE, TRUE); | |
c11d665d | 2275 | #endif |
fd5a6ffb | 2276 | #ifndef DISABLE_MAL_FFROT6D |
71b32d41 ACK |
2277 | if (!fprot6d_re_error) |
2278 | fprot6d_re_error = regex_must_compile(fprot6d_re_error_str, FALSE, TRUE); | |
2279 | if (!fprot6d_re_virus) | |
2280 | fprot6d_re_virus = regex_must_compile(fprot6d_re_virus_str, FALSE, TRUE); | |
c11d665d JH |
2281 | #endif |
2282 | } | |
2283 | ||
2284 | ||
2285 | void | |
2286 | malware_show_supported(FILE * f) | |
2287 | { | |
2288 | struct scan * sc; | |
2289 | fprintf(f, "Malware:"); | |
2290 | for (sc = m_scans; sc->scancode != -1; sc++) fprintf(f, " %s", sc->name); | |
2291 | fprintf(f, "\n"); | |
476be7e2 JH |
2292 | } |
2293 | ||
c11d665d JH |
2294 | |
2295 | # endif /*!MACRO_PREDEF*/ | |
b1f8e4f8 JH |
2296 | #endif /*WITH_CONTENT_SCAN*/ |
2297 | /* | |
2298 | * vi: aw ai sw=2 | |
2299 | */ |