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 | |
4e559e21 | 52 | M_DUMMY |
c8599aad | 53 | } scanner_t; |
b1f8e4f8 JH |
54 | typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t; |
55 | static struct scan | |
56 | { | |
57 | scanner_t scancode; | |
58 | const uschar * name; | |
59 | const uschar * options_default; | |
60 | contype_t conn; | |
61 | } m_scans[] = | |
62 | { | |
c11d665d | 63 | #ifndef DISABLE_MAL_FFROTD |
b1f8e4f8 | 64 | { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP }, |
c11d665d JH |
65 | #endif |
66 | #ifndef DISABLE_MAL_FFROT6D | |
67 | { M_FPROT6D, US"f-prot6d", US"localhost 10200", MC_TCP }, | |
68 | #endif | |
69 | #ifndef DISABLE_MAL_DRWEB | |
b1f8e4f8 | 70 | { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM }, |
c11d665d JH |
71 | #endif |
72 | #ifndef DISABLE_MAL_AVE | |
b1f8e4f8 | 73 | { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX }, |
c11d665d JH |
74 | #endif |
75 | #ifndef DISABLE_MAL_FSECURE | |
b1f8e4f8 | 76 | { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX }, |
c11d665d JH |
77 | #endif |
78 | #ifndef DISABLE_MAL_KAV | |
b1f8e4f8 | 79 | { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX }, |
c11d665d JH |
80 | #endif |
81 | #ifndef DISABLE_MAL_SOPHIE | |
b1f8e4f8 | 82 | { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX }, |
c11d665d JH |
83 | #endif |
84 | #ifndef DISABLE_MAL_CLAM | |
b1f8e4f8 | 85 | { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE }, |
c11d665d JH |
86 | #endif |
87 | #ifndef DISABLE_MAL_MKS | |
b1f8e4f8 | 88 | { M_MKSD, US"mksd", NULL, MC_NONE }, |
c11d665d JH |
89 | #endif |
90 | #ifndef DISABLE_MAL_AVAST | |
b6fbf22d | 91 | { M_AVAST, US"avast", US"/var/run/avast/scan.sock", MC_STRM }, |
c11d665d JH |
92 | #endif |
93 | #ifndef DISABLE_MAL_SOCK | |
94 | { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM }, | |
95 | #endif | |
96 | #ifndef DISABLE_MAL_CMDLINE | |
97 | { M_CMDL, US"cmdline", NULL, MC_NONE }, | |
98 | #endif | |
b1f8e4f8 JH |
99 | { -1, NULL, NULL, MC_NONE } /* end-marker */ |
100 | }; | |
101 | ||
c11d665d JH |
102 | /******************************************************************************/ |
103 | # ifdef MACRO_PREDEF /* build solely to predefine macros */ | |
104 | ||
105 | # include "macro_predef.h" | |
106 | ||
107 | void | |
108 | features_malware(void) | |
109 | { | |
2b8b8e4e JH |
110 | const uschar * s; |
111 | uschar * t; | |
c11d665d JH |
112 | uschar buf[64]; |
113 | ||
114 | spf(buf, sizeof(buf), US"_HAVE_MALWARE_"); | |
115 | ||
d7978c0f | 116 | for (const struct scan * sc = m_scans; sc->scancode != -1; sc++) |
c11d665d | 117 | { |
d7978c0f JH |
118 | for (s = sc->name, t = buf+14; *s; s++) if (*s != '-') |
119 | *t++ = toupper(*s); | |
c11d665d JH |
120 | *t = '\0'; |
121 | builtin_macro_create(buf); | |
122 | } | |
123 | } | |
124 | ||
125 | /******************************************************************************/ | |
126 | # else /*!MACRO_PREDEF, main build*/ | |
127 | ||
128 | ||
129 | #define MALWARE_TIMEOUT 120 /* default timeout, seconds */ | |
130 | ||
131 | static const uschar * malware_regex_default = US ".+"; | |
132 | static const pcre * malware_default_re = NULL; | |
133 | ||
134 | ||
135 | ||
136 | #ifndef DISABLE_MAL_CLAM | |
599dcb77 | 137 | /* The maximum number of clamd servers that are supported in the configuration */ |
c11d665d JH |
138 | # define MAX_CLAMD_SERVERS 32 |
139 | # define MAX_CLAMD_SERVERS_S "32" | |
599dcb77 | 140 | |
8a512ed5 JH |
141 | typedef struct clamd_address { |
142 | uschar * hostspec; | |
143 | unsigned tcp_port; | |
144 | unsigned retry; | |
145 | } clamd_address; | |
8523533c TK |
146 | #endif |
147 | ||
a9ccd69a | 148 | |
c11d665d JH |
149 | #ifndef DISABLE_MAL_DRWEB |
150 | # define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */ | |
151 | # define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */ | |
152 | # define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */ | |
8523533c | 153 | |
c11d665d JH |
154 | # define DERR_READ_ERR (1<<0) /* read error */ |
155 | # define DERR_NOMEMORY (1<<2) /* no memory */ | |
156 | # define DERR_TIMEOUT (1<<9) /* scan timeout has run out */ | |
157 | # define DERR_BAD_CALL (1<<15) /* wrong command */ | |
476be7e2 JH |
158 | |
159 | static const uschar * drweb_re_str = US "infected\\swith\\s*(.+?)$"; | |
160 | static const pcre * drweb_re = NULL; | |
c11d665d | 161 | #endif |
476be7e2 | 162 | |
c11d665d | 163 | #ifndef DISABLE_MAL_FSECURE |
476be7e2 JH |
164 | static const uschar * fsec_re_str = US "\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$"; |
165 | static const pcre * fsec_re = NULL; | |
c11d665d | 166 | #endif |
476be7e2 | 167 | |
c11d665d | 168 | #ifndef DISABLE_MAL_KAV |
476be7e2 JH |
169 | static const uschar * kav_re_sus_str = US "suspicion:\\s*(.+?)\\s*$"; |
170 | static const uschar * kav_re_inf_str = US "infected:\\s*(.+?)\\s*$"; | |
171 | static const pcre * kav_re_sus = NULL; | |
172 | static const pcre * kav_re_inf = NULL; | |
c11d665d | 173 | #endif |
476be7e2 | 174 | |
c11d665d | 175 | #ifndef DISABLE_MAL_AVAST |
476be7e2 | 176 | static const uschar * ava_re_clean_str = US "(?!\\\\)\\t\\[\\+\\]"; |
ad93c40f HSHR |
177 | static const uschar * ava_re_virus_str = US "(?!\\\\)\\t\\[L\\]\\d+\\.0\\t0\\s(.*)"; |
178 | static const uschar * ava_re_error_str = US "(?!\\\\)\\t\\[E\\]\\d+\\.0\\tError\\s\\d+\\s(.*)"; | |
476be7e2 JH |
179 | static const pcre * ava_re_clean = NULL; |
180 | static const pcre * ava_re_virus = NULL; | |
ad93c40f | 181 | static const pcre * ava_re_error = NULL; |
c11d665d | 182 | #endif |
476be7e2 | 183 | |
c11d665d | 184 | #ifndef DISABLE_MAL_FFROT6D |
71b32d41 ACK |
185 | static const uschar * fprot6d_re_error_str = US "^\\d+\\s<(.+?)>$"; |
186 | static const uschar * fprot6d_re_virus_str = US "^\\d+\\s<infected:\\s+(.+?)>\\s+.+$"; | |
187 | static const pcre * fprot6d_re_error = NULL; | |
188 | static const pcre * fprot6d_re_virus = NULL; | |
c11d665d | 189 | #endif |
71b32d41 | 190 | |
476be7e2 JH |
191 | |
192 | ||
193 | /******************************************************************************/ | |
194 | ||
059f2ace | 195 | #ifndef DISABLE_MAL_KAV |
b1f8e4f8 | 196 | /* Routine to check whether a system is big- or little-endian. |
8523533c TK |
197 | Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html |
198 | Needed for proper kavdaemon implementation. Sigh. */ | |
059f2ace JH |
199 | # define BIG_MY_ENDIAN 0 |
200 | # define LITTLE_MY_ENDIAN 1 | |
b1f8e4f8 JH |
201 | static int test_byte_order(void); |
202 | static inline int | |
203 | test_byte_order() | |
204 | { | |
205 | short int word = 0x0001; | |
5903c6ff | 206 | char *byte = CS &word; |
b1f8e4f8 | 207 | return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN); |
8523533c | 208 | } |
059f2ace | 209 | #endif |
8523533c | 210 | |
b1f8e4f8 | 211 | BOOL malware_ok = FALSE; |
8523533c | 212 | |
8544e77a PP |
213 | /* Gross hacks for the -bmalware option; perhaps we should just create |
214 | the scan directory normally for that case, but look into rigging up the | |
215 | needed header variables if not already set on the command-line? */ | |
216 | extern int spool_mbox_ok; | |
55240832 | 217 | extern uschar spooled_message_id[MESSAGE_ID_LENGTH+1]; |
8544e77a | 218 | |
8544e77a | 219 | |
ad93c40f HSHR |
220 | /* Some (currently avast only) use backslash escaped whitespace, |
221 | this function undoes these escapes */ | |
46682a67 | 222 | |
ad93c40f | 223 | static inline void |
46682a67 JH |
224 | unescape(uschar *p) |
225 | { | |
226 | uschar *p0; | |
227 | for (; *p; ++p) | |
228 | if (*p == '\\' && (isspace(p[1]) || p[1] == '\\')) | |
229 | for (p0 = p; *p0; ++p0) *p0 = p0[1]; | |
ad93c40f | 230 | } |
8544e77a | 231 | |
ad93c40f | 232 | /* --- malware_*_defer --- */ |
b1f8e4f8 | 233 | static inline int |
ad93c40f | 234 | malware_panic_defer(const uschar * str) |
b1f8e4f8 | 235 | { |
8a512ed5 JH |
236 | log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str); |
237 | return DEFER; | |
b1f8e4f8 | 238 | } |
ad93c40f HSHR |
239 | static inline int |
240 | malware_log_defer(const uschar * str) | |
241 | { | |
242 | log_write(0, LOG_MAIN, "malware acl condition: %s", str); | |
243 | return DEFER; | |
244 | } | |
245 | /* --- m_*_defer --- */ | |
246 | static inline int | |
247 | m_panic_defer(struct scan * scanent, const uschar * hostport, | |
0ea02355 | 248 | const uschar * str) |
b1f8e4f8 | 249 | { |
ad93c40f | 250 | return malware_panic_defer(string_sprintf("%s %s : %s", |
0ea02355 | 251 | scanent->name, hostport ? hostport : CUS"", str)); |
b1f8e4f8 | 252 | } |
ad93c40f HSHR |
253 | static inline int |
254 | m_log_defer(struct scan * scanent, const uschar * hostport, | |
255 | const uschar * str) | |
256 | { | |
257 | return malware_log_defer(string_sprintf("%s %s : %s", | |
258 | scanent->name, hostport ? hostport : CUS"", str)); | |
259 | } | |
260 | /* --- m_*_defer_3 */ | |
261 | static inline int | |
262 | m_panic_defer_3(struct scan * scanent, const uschar * hostport, | |
263 | const uschar * str, int fd_to_close) | |
264 | { | |
265 | (void) close(fd_to_close); | |
266 | return m_panic_defer(scanent, hostport, str); | |
267 | } | |
b1f8e4f8 JH |
268 | |
269 | /*************************************************/ | |
270 | ||
c11d665d | 271 | #ifndef DISABLE_MAL_CLAM |
b1f8e4f8 JH |
272 | /* Only used by the Clamav code, which is working from a list of servers and |
273 | uses the returned in_addr to get a second connection to the same system. | |
274 | */ | |
275 | static inline int | |
276 | m_tcpsocket(const uschar * hostname, unsigned int port, | |
10ac8d7f | 277 | host_item * host, uschar ** errstr, const blob * fastopen_blob) |
b1f8e4f8 | 278 | { |
4a5cbaff | 279 | return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, |
10ac8d7f | 280 | host, errstr, fastopen_blob); |
b1f8e4f8 | 281 | } |
c11d665d | 282 | #endif |
b1f8e4f8 | 283 | |
b1f8e4f8 JH |
284 | static int |
285 | m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr) | |
286 | { | |
8a512ed5 JH |
287 | if (send(sock, buf, cnt, 0) < 0) |
288 | { | |
289 | int err = errno; | |
290 | (void)close(sock); | |
291 | *errstr = string_sprintf("unable to send to socket (%s): %s", | |
292 | buf, strerror(err)); | |
293 | return -1; | |
294 | } | |
295 | return sock; | |
b1f8e4f8 JH |
296 | } |
297 | ||
298 | static const pcre * | |
299 | m_pcre_compile(const uschar * re, uschar ** errstr) | |
300 | { | |
8a512ed5 JH |
301 | const uschar * rerror; |
302 | int roffset; | |
303 | const pcre * cre; | |
304 | ||
305 | cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL); | |
306 | if (!cre) | |
307 | *errstr= string_sprintf("regular expression error in '%s': %s at offset %d", | |
308 | re, rerror, roffset); | |
309 | return cre; | |
b1f8e4f8 JH |
310 | } |
311 | ||
312 | uschar * | |
313 | m_pcre_exec(const pcre * cre, uschar * text) | |
314 | { | |
8a512ed5 JH |
315 | int ovector[10*3]; |
316 | int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0, | |
c11d665d | 317 | ovector, nelem(ovector)); |
8a512ed5 JH |
318 | uschar * substr = NULL; |
319 | if (i >= 2) /* Got it */ | |
320 | pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr); | |
321 | return substr; | |
b1f8e4f8 JH |
322 | } |
323 | ||
324 | static const pcre * | |
55414b25 JH |
325 | m_pcre_nextinlist(const uschar ** list, int * sep, |
326 | char * listerr, uschar ** errstr) | |
b1f8e4f8 | 327 | { |
8a512ed5 JH |
328 | const uschar * list_ele; |
329 | const pcre * cre = NULL; | |
330 | ||
331 | if (!(list_ele = string_nextinlist(list, sep, NULL, 0))) | |
332 | *errstr = US listerr; | |
333 | else | |
ac4d558b JH |
334 | { |
335 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "RE: ", | |
336 | string_printing(list_ele)); | |
8a512ed5 | 337 | cre = m_pcre_compile(CUS list_ele, errstr); |
ac4d558b | 338 | } |
8a512ed5 | 339 | return cre; |
b1f8e4f8 JH |
340 | } |
341 | ||
4e71661f JH |
342 | /* |
343 | Simple though inefficient wrapper for reading a line. Drop CRs and the | |
344 | trailing newline. Can return early on buffer full. Null-terminate. | |
345 | Apply initial timeout if no data ready. | |
346 | ||
0f0c8159 JH |
347 | Return: number of chars - zero for an empty line |
348 | -1 on EOF | |
349 | -2 on timeout or error | |
4e71661f JH |
350 | */ |
351 | static int | |
0a5441fc | 352 | recv_line(int fd, uschar * buffer, int bsize, time_t tmo) |
4e71661f JH |
353 | { |
354 | uschar * p = buffer; | |
355 | ssize_t rcv; | |
0f0c8159 | 356 | BOOL ok = FALSE; |
4e71661f | 357 | |
0a5441fc | 358 | if (!fd_ready(fd, tmo)) |
0f0c8159 | 359 | return -2; |
4e71661f | 360 | |
0f0c8159 | 361 | /*XXX tmo handling assumes we always get a whole line */ |
4e71661f | 362 | /* read until \n */ |
0f0c8159 | 363 | errno = 0; |
4e71661f JH |
364 | while ((rcv = read(fd, p, 1)) > 0) |
365 | { | |
0f0c8159 | 366 | ok = TRUE; |
4e71661f JH |
367 | if (p-buffer > bsize-2) break; |
368 | if (*p == '\n') break; | |
369 | if (*p != '\r') p++; | |
370 | } | |
0f0c8159 JH |
371 | if (!ok) |
372 | { | |
e1d04f48 | 373 | DEBUG(D_acl) debug_printf_indent("Malware scan: read %s (%s)\n", |
0f0c8159 JH |
374 | rcv==0 ? "EOF" : "error", strerror(errno)); |
375 | return rcv==0 ? -1 : -2; | |
376 | } | |
4e71661f JH |
377 | *p = '\0'; |
378 | ||
e1d04f48 | 379 | DEBUG(D_acl) debug_printf_indent("Malware scan: read '%s'\n", buffer); |
4e71661f JH |
380 | return p - buffer; |
381 | } | |
382 | ||
383 | /* return TRUE iff size as requested */ | |
384 | static BOOL | |
0a5441fc | 385 | recv_len(int sock, void * buf, int size, time_t tmo) |
4e71661f | 386 | { |
0a5441fc | 387 | return fd_ready(sock, tmo) |
4e71661f JH |
388 | ? recv(sock, buf, size, 0) == size |
389 | : FALSE; | |
390 | } | |
391 | ||
392 | ||
0f0c8159 | 393 | |
c11d665d | 394 | #ifndef DISABLE_MAL_MKS |
0f0c8159 JH |
395 | /* ============= private routines for the "mksd" scanner type ============== */ |
396 | ||
c11d665d | 397 | # include <sys/uio.h> |
0f0c8159 JH |
398 | |
399 | static inline int | |
400 | mksd_writev (int sock, struct iovec * iov, int iovcnt) | |
401 | { | |
402 | int i; | |
403 | ||
404 | for (;;) | |
405 | { | |
406 | do | |
407 | i = writev (sock, iov, iovcnt); | |
408 | while (i < 0 && errno == EINTR); | |
409 | if (i <= 0) | |
410 | { | |
ad93c40f | 411 | (void) malware_panic_defer( |
0f0c8159 JH |
412 | US"unable to write to mksd UNIX socket (/var/run/mksd/socket)"); |
413 | return -1; | |
414 | } | |
415 | for (;;) /* check for short write */ | |
416 | if (i >= iov->iov_len) | |
417 | { | |
418 | if (--iovcnt == 0) | |
419 | return 0; | |
420 | i -= iov->iov_len; | |
421 | iov++; | |
422 | } | |
423 | else | |
424 | { | |
425 | iov->iov_len -= i; | |
426 | iov->iov_base = CS iov->iov_base + i; | |
427 | break; | |
428 | } | |
429 | } | |
430 | } | |
431 | ||
432 | static inline int | |
0a5441fc | 433 | mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size, time_t tmo) |
0f0c8159 | 434 | { |
74f1a423 | 435 | client_conn_ctx cctx = {.sock = sock}; |
0f0c8159 JH |
436 | int offset = 0; |
437 | int i; | |
438 | ||
439 | do | |
440 | { | |
0a5441fc | 441 | i = ip_recv(&cctx, av_buffer+offset, av_buffer_size-offset, tmo); |
0f0c8159 JH |
442 | if (i <= 0) |
443 | { | |
ad93c40f | 444 | (void) malware_panic_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)"); |
0f0c8159 JH |
445 | return -1; |
446 | } | |
447 | ||
448 | offset += i; | |
449 | /* offset == av_buffer_size -> buffer full */ | |
450 | if (offset == av_buffer_size) | |
451 | { | |
ad93c40f | 452 | (void) malware_panic_defer(US"malformed reply received from mksd"); |
0f0c8159 JH |
453 | return -1; |
454 | } | |
455 | } while (av_buffer[offset-1] != '\n'); | |
456 | ||
457 | av_buffer[offset] = '\0'; | |
458 | return offset; | |
459 | } | |
460 | ||
461 | static inline int | |
462 | mksd_parse_line(struct scan * scanent, char * line) | |
463 | { | |
464 | char *p; | |
465 | ||
466 | switch (*line) | |
467 | { | |
468 | case 'O': /* OK */ | |
469 | return OK; | |
470 | ||
471 | case 'E': | |
472 | case 'A': /* ERR */ | |
473 | if ((p = strchr (line, '\n')) != NULL) | |
474 | *p = '\0'; | |
ad93c40f | 475 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
476 | string_sprintf("scanner failed: %s", line)); |
477 | ||
478 | default: /* VIR */ | |
479 | if ((p = strchr (line, '\n')) != NULL) | |
480 | { | |
481 | *p = '\0'; | |
482 | if ( p-line > 5 | |
483 | && line[3] == ' ' | |
484 | && (p = strchr(line+4, ' ')) != NULL | |
485 | && p-line > 4 | |
486 | ) | |
487 | { | |
488 | *p = '\0'; | |
489 | malware_name = string_copy(US line+4); | |
490 | return OK; | |
491 | } | |
492 | } | |
ad93c40f | 493 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
494 | string_sprintf("malformed reply received: %s", line)); |
495 | } | |
496 | } | |
497 | ||
498 | static int | |
499 | mksd_scan_packed(struct scan * scanent, int sock, const uschar * scan_filename, | |
0a5441fc | 500 | time_t tmo) |
0f0c8159 JH |
501 | { |
502 | struct iovec iov[3]; | |
503 | const char *cmd = "MSQ\n"; | |
504 | uschar av_buffer[1024]; | |
505 | ||
506 | iov[0].iov_base = (void *) cmd; | |
507 | iov[0].iov_len = 3; | |
508 | iov[1].iov_base = (void *) scan_filename; | |
509 | iov[1].iov_len = Ustrlen(scan_filename); | |
510 | iov[2].iov_base = (void *) (cmd + 3); | |
511 | iov[2].iov_len = 1; | |
512 | ||
513 | if (mksd_writev (sock, iov, 3) < 0) | |
514 | return DEFER; | |
515 | ||
516 | if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer), tmo) < 0) | |
517 | return DEFER; | |
518 | ||
519 | return mksd_parse_line (scanent, CS av_buffer); | |
520 | } | |
c11d665d | 521 | #endif /* MKSD */ |
0f0c8159 | 522 | |
8a512ed5 | 523 | |
c11d665d | 524 | #ifndef DISABLE_MAL_CLAM |
8a512ed5 JH |
525 | static int |
526 | clamd_option(clamd_address * cd, const uschar * optstr, int * subsep) | |
527 | { | |
528 | uschar * s; | |
529 | ||
530 | cd->retry = 0; | |
531 | while ((s = string_nextinlist(&optstr, subsep, NULL, 0))) | |
8a512ed5 JH |
532 | if (Ustrncmp(s, "retry=", 6) == 0) |
533 | { | |
534 | int sec = readconf_readtime((s += 6), '\0', FALSE); | |
535 | if (sec < 0) | |
536 | return FAIL; | |
537 | cd->retry = sec; | |
538 | } | |
539 | else | |
540 | return FAIL; | |
93a6fce2 | 541 | return OK; |
8a512ed5 | 542 | } |
c11d665d JH |
543 | #endif |
544 | ||
545 | ||
8a512ed5 | 546 | |
8544e77a PP |
547 | /************************************************* |
548 | * Scan content for malware * | |
549 | *************************************************/ | |
550 | ||
551 | /* This is an internal interface for scanning an email; the normal interface | |
552 | is via malware(), or there's malware_in_file() used for testing/debugging. | |
553 | ||
554 | Arguments: | |
0f0c8159 | 555 | malware_re match condition for "malware=" |
040721f2 JH |
556 | scan_filename the file holding the email to be scanned, if we're faking |
557 | this up for the -bmalware test, else NULL | |
0f0c8159 | 558 | timeout if nonzero, non-default timeoutl |
8544e77a PP |
559 | |
560 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
561 | where true means malware was found (condition applies) | |
562 | */ | |
b1f8e4f8 | 563 | static int |
040721f2 JH |
564 | malware_internal(const uschar * malware_re, const uschar * scan_filename, |
565 | int timeout) | |
b1f8e4f8 | 566 | { |
0f0c8159 | 567 | int sep = 0; |
55414b25 | 568 | const uschar *av_scanner_work = av_scanner; |
0f0c8159 | 569 | uschar *scanner_name; |
0f0c8159 JH |
570 | unsigned long mbox_size; |
571 | FILE *mbox_file; | |
572 | const pcre *re; | |
573 | uschar * errstr; | |
574 | struct scan * scanent; | |
575 | const uschar * scanner_options; | |
74f1a423 | 576 | client_conn_ctx malware_daemon_ctx = {.sock = -1}; |
0f0c8159 | 577 | time_t tmo; |
040721f2 | 578 | uschar * eml_filename, * eml_dir; |
0f0c8159 | 579 | |
040721f2 JH |
580 | if (!malware_re) |
581 | return FAIL; /* empty means "don't match anything" */ | |
582 | ||
583 | /* Ensure the eml mbox file is spooled up */ | |
584 | ||
585 | if (!(mbox_file = spool_mbox(&mbox_size, scan_filename, &eml_filename))) | |
ad93c40f | 586 | return malware_panic_defer(US"error while creating mbox spool file"); |
0f0c8159 | 587 | |
040721f2 JH |
588 | /* None of our current scanners need the mbox file as a stream (they use |
589 | the name), so we can close it right away. Get the directory too. */ | |
0f0c8159 | 590 | |
040721f2 JH |
591 | (void) fclose(mbox_file); |
592 | eml_dir = string_copyn(eml_filename, Ustrrchr(eml_filename, '/') - eml_filename); | |
0f0c8159 JH |
593 | |
594 | /* parse 1st option */ | |
040721f2 | 595 | if (strcmpic(malware_re, US"false") == 0 || Ustrcmp(malware_re,"0") == 0) |
0f0c8159 JH |
596 | return FAIL; /* explicitly no matching */ |
597 | ||
598 | /* special cases (match anything except empty) */ | |
476be7e2 JH |
599 | if ( strcmpic(malware_re,US"true") == 0 |
600 | || Ustrcmp(malware_re,"*") == 0 | |
601 | || Ustrcmp(malware_re,"1") == 0 | |
602 | ) | |
603 | { | |
604 | if ( !malware_default_re | |
605 | && !(malware_default_re = m_pcre_compile(malware_regex_default, &errstr))) | |
ad93c40f | 606 | return malware_panic_defer(errstr); |
0f0c8159 | 607 | malware_re = malware_regex_default; |
476be7e2 JH |
608 | re = malware_default_re; |
609 | } | |
0f0c8159 JH |
610 | |
611 | /* compile the regex, see if it works */ | |
476be7e2 | 612 | else if (!(re = m_pcre_compile(malware_re, &errstr))) |
ad93c40f | 613 | return malware_panic_defer(errstr); |
0f0c8159 JH |
614 | |
615 | /* if av_scanner starts with a dollar, expand it first */ | |
616 | if (*av_scanner == '$') | |
617 | { | |
618 | if (!(av_scanner_work = expand_string(av_scanner))) | |
ad93c40f | 619 | return malware_panic_defer( |
0f0c8159 JH |
620 | string_sprintf("av_scanner starts with $, but expansion failed: %s", |
621 | expand_string_message)); | |
b1f8e4f8 | 622 | |
0f0c8159 | 623 | DEBUG(D_acl) |
e1d04f48 | 624 | debug_printf_indent("Expanded av_scanner global: %s\n", av_scanner_work); |
0f0c8159 JH |
625 | /* disable result caching in this case */ |
626 | malware_name = NULL; | |
627 | malware_ok = FALSE; | |
8523533c TK |
628 | } |
629 | ||
0f0c8159 JH |
630 | /* Do not scan twice (unless av_scanner is dynamic). */ |
631 | if (!malware_ok) | |
632 | { | |
633 | /* find the scanner type from the av_scanner option */ | |
634 | if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) | |
ad93c40f | 635 | return malware_panic_defer(US"av_scanner configuration variable is empty"); |
0f0c8159 JH |
636 | if (!timeout) timeout = MALWARE_TIMEOUT; |
637 | tmo = time(NULL) + timeout; | |
638 | ||
3e60dd41 JH |
639 | for (scanent = m_scans; ; scanent++) |
640 | { | |
0f0c8159 | 641 | if (!scanent->name) |
ad93c40f | 642 | return malware_panic_defer(string_sprintf("unknown scanner type '%s'", |
0f0c8159 JH |
643 | scanner_name)); |
644 | if (strcmpic(scanner_name, US scanent->name) != 0) | |
645 | continue; | |
ac4d558b JH |
646 | DEBUG(D_acl) debug_printf_indent("Malware scan: %s tmo=%s\n", |
647 | scanner_name, readconf_printtime(timeout)); | |
648 | ||
0f0c8159 JH |
649 | if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0))) |
650 | scanner_options = scanent->options_default; | |
651 | if (scanent->conn == MC_NONE) | |
b1f8e4f8 | 652 | break; |
ac4d558b JH |
653 | |
654 | DEBUG(D_acl) debug_printf_indent("%15s%10s%s\n", "", "socket: ", scanner_options); | |
0f0c8159 JH |
655 | switch(scanent->conn) |
656 | { | |
74f1a423 JH |
657 | case MC_TCP: |
658 | malware_daemon_ctx.sock = ip_tcpsocket(scanner_options, &errstr, 5); break; | |
659 | case MC_UNIX: | |
660 | malware_daemon_ctx.sock = ip_unixsocket(scanner_options, &errstr); break; | |
661 | case MC_STRM: | |
662 | malware_daemon_ctx.sock = ip_streamsocket(scanner_options, &errstr, 5); break; | |
663 | default: | |
664 | /* compiler quietening */ break; | |
384152a6 | 665 | } |
74f1a423 | 666 | if (malware_daemon_ctx.sock < 0) |
ad93c40f | 667 | return m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
668 | break; |
669 | } | |
8e669ac1 | 670 | |
0f0c8159 JH |
671 | switch (scanent->scancode) |
672 | { | |
c11d665d | 673 | #ifndef DISABLE_MAL_FFROTD |
0f0c8159 | 674 | case M_FPROTD: /* "f-protd" scanner type -------------------------------- */ |
b1f8e4f8 | 675 | { |
0f0c8159 JH |
676 | uschar *fp_scan_option; |
677 | unsigned int detected=0, par_count=0; | |
678 | uschar * scanrequest; | |
679 | uschar buf[32768], *strhelper, *strhelper2; | |
680 | uschar * malware_name_internal = NULL; | |
681 | int len; | |
b1f8e4f8 | 682 | |
0f0c8159 | 683 | scanrequest = string_sprintf("GET %s", eml_filename); |
b1f8e4f8 | 684 | |
0f0c8159 JH |
685 | while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep, |
686 | NULL, 0))) | |
687 | { | |
688 | scanrequest = string_sprintf("%s%s%s", scanrequest, | |
689 | par_count ? "%20" : "?", fp_scan_option); | |
690 | par_count++; | |
691 | } | |
692 | scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest); | |
e1d04f48 | 693 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n", |
0f0c8159 | 694 | scanner_name, scanrequest); |
b1f8e4f8 | 695 | |
0f0c8159 | 696 | /* send scan request */ |
74f1a423 | 697 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) |
ad93c40f | 698 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 699 | |
74f1a423 | 700 | while ((len = recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo)) >= 0) |
0f0c8159 JH |
701 | if (len > 0) |
702 | { | |
703 | if (Ustrstr(buf, US"<detected type=\"") != NULL) | |
704 | detected = 1; | |
705 | else if (detected && (strhelper = Ustrstr(buf, US"<name>"))) | |
4e71661f | 706 | { |
0f0c8159 | 707 | if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) |
4e71661f | 708 | { |
0f0c8159 JH |
709 | *strhelper2 = '\0'; |
710 | malware_name_internal = string_copy(strhelper+6); | |
4e71661f JH |
711 | } |
712 | } | |
0f0c8159 | 713 | else if (Ustrstr(buf, US"<summary code=\"")) |
4e71661f | 714 | { |
0f0c8159 JH |
715 | malware_name = Ustrstr(buf, US"<summary code=\"11\">") |
716 | ? malware_name_internal : NULL; | |
717 | break; | |
4e71661f | 718 | } |
0f0c8159 JH |
719 | } |
720 | if (len < -1) | |
721 | { | |
74f1a423 | 722 | (void)close(malware_daemon_ctx.sock); |
0f0c8159 JH |
723 | return DEFER; |
724 | } | |
725 | break; | |
726 | } /* f-protd */ | |
c11d665d JH |
727 | #endif |
728 | ||
729 | #ifndef DISABLE_MAL_FFROT6D | |
730 | case M_FPROT6D: /* "f-prot6d" scanner type ----------------------------------- */ | |
731 | { | |
732 | int bread; | |
733 | uschar * e; | |
734 | uschar * linebuffer; | |
735 | uschar * scanrequest; | |
736 | uschar av_buffer[1024]; | |
737 | ||
738 | if ((!fprot6d_re_virus && !(fprot6d_re_virus = m_pcre_compile(fprot6d_re_virus_str, &errstr))) | |
739 | || (!fprot6d_re_error && !(fprot6d_re_error = m_pcre_compile(fprot6d_re_error_str, &errstr)))) | |
ad93c40f | 740 | return malware_panic_defer(errstr); |
c11d665d JH |
741 | |
742 | scanrequest = string_sprintf("SCAN FILE %s\n", eml_filename); | |
743 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s: %s\n", | |
744 | scanner_name, scanrequest); | |
745 | ||
74f1a423 | 746 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest), &errstr) < 0) |
ad93c40f | 747 | return m_panic_defer(scanent, CUS callout_address, errstr); |
c11d665d | 748 | |
0a5441fc | 749 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo); |
c11d665d JH |
750 | |
751 | if (bread <= 0) | |
ad93c40f | 752 | return m_panic_defer_3(scanent, CUS callout_address, |
c11d665d | 753 | string_sprintf("unable to read from socket (%s)", strerror(errno)), |
74f1a423 | 754 | malware_daemon_ctx.sock); |
c11d665d JH |
755 | |
756 | if (bread == sizeof(av_buffer)) | |
ad93c40f | 757 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 758 | US"buffer too small", malware_daemon_ctx.sock); |
c11d665d JH |
759 | |
760 | av_buffer[bread] = '\0'; | |
761 | linebuffer = string_copy(av_buffer); | |
762 | ||
74f1a423 | 763 | m_sock_send(malware_daemon_ctx.sock, US"QUIT\n", 5, 0); |
c11d665d JH |
764 | |
765 | if ((e = m_pcre_exec(fprot6d_re_error, linebuffer))) | |
ad93c40f | 766 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 767 | string_sprintf("scanner reported error (%s)", e), malware_daemon_ctx.sock); |
b1f8e4f8 | 768 | |
c11d665d JH |
769 | if (!(malware_name = m_pcre_exec(fprot6d_re_virus, linebuffer))) |
770 | malware_name = NULL; | |
771 | ||
772 | break; | |
773 | } /* f-prot6d */ | |
774 | #endif | |
775 | ||
776 | #ifndef DISABLE_MAL_DRWEB | |
0f0c8159 JH |
777 | case M_DRWEB: /* "drweb" scanner type ----------------------------------- */ |
778 | /* v0.1 - added support for tcp sockets */ | |
779 | /* v0.0 - initial release -- support for unix sockets */ | |
780 | { | |
781 | int result; | |
782 | off_t fsize; | |
783 | unsigned int fsize_uint; | |
784 | uschar * tmpbuf, *drweb_fbuf; | |
785 | int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd, | |
786 | drweb_vnum, drweb_slen, drweb_fin = 0x0000; | |
0f0c8159 JH |
787 | |
788 | /* prepare variables */ | |
789 | drweb_cmd = htonl(DRWEBD_SCAN_CMD); | |
790 | drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL); | |
791 | ||
792 | if (*scanner_options != '/') | |
793 | { | |
794 | /* calc file size */ | |
795 | if ((drweb_fd = open(CCS eml_filename, O_RDONLY)) == -1) | |
ad93c40f | 796 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
797 | string_sprintf("can't open spool file %s: %s", |
798 | eml_filename, strerror(errno)), | |
74f1a423 | 799 | malware_daemon_ctx.sock); |
b1f8e4f8 | 800 | |
0f0c8159 JH |
801 | if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) |
802 | { | |
d315eda1 JH |
803 | int err; |
804 | badseek: err = errno; | |
b1f8e4f8 | 805 | (void)close(drweb_fd); |
ad93c40f | 806 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
807 | string_sprintf("can't seek spool file %s: %s", |
808 | eml_filename, strerror(err)), | |
74f1a423 | 809 | malware_daemon_ctx.sock); |
0f0c8159 JH |
810 | } |
811 | fsize_uint = (unsigned int) fsize; | |
812 | if ((off_t)fsize_uint != fsize) | |
813 | { | |
b1f8e4f8 | 814 | (void)close(drweb_fd); |
ad93c40f | 815 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
816 | string_sprintf("seeking spool file %s, size overflow", |
817 | eml_filename), | |
74f1a423 | 818 | malware_daemon_ctx.sock); |
4e71661f | 819 | } |
0f0c8159 | 820 | drweb_slen = htonl(fsize); |
d315eda1 JH |
821 | if (lseek(drweb_fd, 0, SEEK_SET) < 0) |
822 | goto badseek; | |
0f0c8159 | 823 | |
e1d04f48 | 824 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s remote scan [%s]\n", |
0f0c8159 JH |
825 | scanner_name, scanner_options); |
826 | ||
827 | /* send scan request */ | |
74f1a423 JH |
828 | if ((send(malware_daemon_ctx.sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || |
829 | (send(malware_daemon_ctx.sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
830 | (send(malware_daemon_ctx.sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) || | |
831 | (send(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) | |
4e71661f | 832 | { |
0f0c8159 | 833 | (void)close(drweb_fd); |
ad93c40f | 834 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 | 835 | "unable to send commands to socket (%s)", scanner_options), |
74f1a423 | 836 | malware_daemon_ctx.sock); |
4e71661f | 837 | } |
8e669ac1 | 838 | |
f3ebb786 | 839 | if (!(drweb_fbuf = store_malloc(fsize_uint))) |
0f0c8159 JH |
840 | { |
841 | (void)close(drweb_fd); | |
ad93c40f | 842 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
843 | string_sprintf("unable to allocate memory %u for file (%s)", |
844 | fsize_uint, eml_filename), | |
74f1a423 | 845 | malware_daemon_ctx.sock); |
0f0c8159 | 846 | } |
b1f8e4f8 | 847 | |
0f0c8159 JH |
848 | if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) |
849 | { | |
850 | int err = errno; | |
851 | (void)close(drweb_fd); | |
f3ebb786 | 852 | store_free(drweb_fbuf); |
ad93c40f | 853 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
854 | string_sprintf("can't read spool file %s: %s", |
855 | eml_filename, strerror(err)), | |
74f1a423 | 856 | malware_daemon_ctx.sock); |
0f0c8159 JH |
857 | } |
858 | (void)close(drweb_fd); | |
b1f8e4f8 | 859 | |
0f0c8159 | 860 | /* send file body to socket */ |
74f1a423 | 861 | if (send(malware_daemon_ctx.sock, drweb_fbuf, fsize, 0) < 0) |
4e71661f | 862 | { |
f3ebb786 | 863 | store_free(drweb_fbuf); |
ad93c40f | 864 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 | 865 | "unable to send file body to socket (%s)", scanner_options), |
74f1a423 | 866 | malware_daemon_ctx.sock); |
0f0c8159 | 867 | } |
f3ebb786 | 868 | store_free(drweb_fbuf); |
0f0c8159 JH |
869 | } |
870 | else | |
871 | { | |
872 | drweb_slen = htonl(Ustrlen(eml_filename)); | |
b1f8e4f8 | 873 | |
e1d04f48 | 874 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s local scan [%s]\n", |
0f0c8159 | 875 | scanner_name, scanner_options); |
b1f8e4f8 | 876 | |
0f0c8159 | 877 | /* send scan request */ |
74f1a423 JH |
878 | if ((send(malware_daemon_ctx.sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) || |
879 | (send(malware_daemon_ctx.sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) || | |
880 | (send(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) || | |
881 | (send(malware_daemon_ctx.sock, eml_filename, Ustrlen(eml_filename), 0) < 0) || | |
882 | (send(malware_daemon_ctx.sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) | |
ad93c40f | 883 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
0f0c8159 | 884 | "unable to send commands to socket (%s)", scanner_options), |
74f1a423 | 885 | malware_daemon_ctx.sock); |
0f0c8159 | 886 | } |
b1f8e4f8 | 887 | |
0f0c8159 | 888 | /* wait for result */ |
74f1a423 | 889 | if (!recv_len(malware_daemon_ctx.sock, &drweb_rc, sizeof(drweb_rc), tmo)) |
ad93c40f | 890 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 891 | US"unable to read return code", malware_daemon_ctx.sock); |
0f0c8159 JH |
892 | drweb_rc = ntohl(drweb_rc); |
893 | ||
74f1a423 | 894 | if (!recv_len(malware_daemon_ctx.sock, &drweb_vnum, sizeof(drweb_vnum), tmo)) |
ad93c40f | 895 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 896 | US"unable to read the number of viruses", malware_daemon_ctx.sock); |
0f0c8159 JH |
897 | drweb_vnum = ntohl(drweb_vnum); |
898 | ||
899 | /* "virus(es) found" if virus number is > 0 */ | |
900 | if (drweb_vnum) | |
901 | { | |
acec9514 | 902 | gstring * g = NULL; |
b1f8e4f8 | 903 | |
0f0c8159 JH |
904 | /* setup default virus name */ |
905 | malware_name = US"unknown"; | |
b1f8e4f8 | 906 | |
0f0c8159 | 907 | /* set up match regex */ |
476be7e2 JH |
908 | if (!drweb_re) |
909 | drweb_re = m_pcre_compile(drweb_re_str, &errstr); | |
b1f8e4f8 | 910 | |
0f0c8159 | 911 | /* read and concatenate virus names into one string */ |
d7978c0f | 912 | for (int i = 0; i < drweb_vnum; i++) |
4e71661f | 913 | { |
acec9514 JH |
914 | int ovector[10*3]; |
915 | ||
0f0c8159 | 916 | /* read the size of report */ |
74f1a423 | 917 | if (!recv_len(malware_daemon_ctx.sock, &drweb_slen, sizeof(drweb_slen), tmo)) |
ad93c40f | 918 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 919 | US"cannot read report size", malware_daemon_ctx.sock); |
0f0c8159 | 920 | drweb_slen = ntohl(drweb_slen); |
f3ebb786 JH |
921 | |
922 | /* assume tainted, since it is external input */ | |
923 | tmpbuf = store_get(drweb_slen, TRUE); | |
b1f8e4f8 | 924 | |
0f0c8159 | 925 | /* read report body */ |
74f1a423 | 926 | if (!recv_len(malware_daemon_ctx.sock, tmpbuf, drweb_slen, tmo)) |
ad93c40f | 927 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 928 | US"cannot read report string", malware_daemon_ctx.sock); |
0f0c8159 | 929 | tmpbuf[drweb_slen] = '\0'; |
8544e77a | 930 | |
0f0c8159 JH |
931 | /* try matcher on the line, grab substring */ |
932 | result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, | |
c11d665d | 933 | ovector, nelem(ovector)); |
0f0c8159 JH |
934 | if (result >= 2) |
935 | { | |
936 | const char * pre_malware_nb; | |
8e669ac1 | 937 | |
0f0c8159 | 938 | pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb); |
8e669ac1 | 939 | |
0f0c8159 | 940 | if (i==0) /* the first name we just copy to malware_name */ |
b2bcdd35 | 941 | g = string_cat(NULL, US pre_malware_nb); |
8e669ac1 | 942 | |
acec9514 | 943 | /*XXX could be string_append_listele? */ |
0f0c8159 | 944 | else /* concatenate each new virus name to previous */ |
acec9514 | 945 | g = string_append(g, 2, "/", pre_malware_nb); |
8e669ac1 | 946 | |
0f0c8159 JH |
947 | pcre_free_substring(pre_malware_nb); |
948 | } | |
949 | } | |
acec9514 | 950 | malware_name = string_from_gstring(g); |
0f0c8159 JH |
951 | } |
952 | else | |
953 | { | |
954 | const char *drweb_s = NULL; | |
955 | ||
956 | if (drweb_rc & DERR_READ_ERR) drweb_s = "read error"; | |
957 | if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory"; | |
958 | if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout"; | |
959 | if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command"; | |
960 | /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED. | |
961 | * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM, | |
962 | * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR | |
963 | * and others are ignored */ | |
964 | if (drweb_s) | |
ad93c40f | 965 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 966 | string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s), |
74f1a423 | 967 | malware_daemon_ctx.sock); |
8e669ac1 | 968 | |
0f0c8159 | 969 | /* no virus found */ |
b1f8e4f8 | 970 | malware_name = NULL; |
0f0c8159 JH |
971 | } |
972 | break; | |
973 | } /* drweb */ | |
c11d665d | 974 | #endif |
8e669ac1 | 975 | |
c11d665d | 976 | #ifndef DISABLE_MAL_AVE |
0f0c8159 JH |
977 | case M_AVES: /* "aveserver" scanner type -------------------------------- */ |
978 | { | |
979 | uschar buf[32768]; | |
980 | int result; | |
8544e77a | 981 | |
0f0c8159 JH |
982 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ |
983 | buf[0] = 0; | |
74f1a423 | 984 | recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo); |
8544e77a | 985 | |
0f0c8159 | 986 | if (buf[0] != '2') /* aveserver is having problems */ |
ad93c40f | 987 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 988 | string_sprintf("unavailable (Responded: %s).", |
5903c6ff | 989 | ((buf[0] != 0) ? buf : US "nothing") ), |
74f1a423 | 990 | malware_daemon_ctx.sock); |
8e669ac1 | 991 | |
0f0c8159 JH |
992 | /* prepare our command */ |
993 | (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n", | |
994 | eml_filename); | |
995 | ||
996 | /* and send it */ | |
e1d04f48 | 997 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s %s\n", |
0f0c8159 | 998 | scanner_name, buf); |
74f1a423 | 999 | if (m_sock_send(malware_daemon_ctx.sock, buf, Ustrlen(buf), &errstr) < 0) |
ad93c40f | 1000 | return m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1001 | |
1002 | malware_name = NULL; | |
1003 | result = 0; | |
1004 | /* read response lines, find malware name and final response */ | |
74f1a423 | 1005 | while (recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo) > 0) |
0f0c8159 JH |
1006 | { |
1007 | if (buf[0] == '2') | |
1008 | break; | |
1009 | if (buf[0] == '5') /* aveserver is having problems */ | |
4e71661f | 1010 | { |
ad93c40f | 1011 | result = m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1012 | string_sprintf("unable to scan file %s (Responded: %s).", |
1013 | eml_filename, buf)); | |
1014 | break; | |
4e71661f | 1015 | } |
0f0c8159 JH |
1016 | if (Ustrncmp(buf,"322",3) == 0) |
1017 | { | |
1018 | uschar *p = Ustrchr(&buf[4], ' '); | |
1019 | *p = '\0'; | |
1020 | malware_name = string_copy(&buf[4]); | |
1021 | } | |
1022 | } | |
1023 | ||
74f1a423 | 1024 | if (m_sock_send(malware_daemon_ctx.sock, US"quit\r\n", 6, &errstr) < 0) |
ad93c40f | 1025 | return m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1026 | |
1027 | /* read aveserver's greeting and see if it is ready (2xx greeting) */ | |
1028 | buf[0] = 0; | |
74f1a423 | 1029 | recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo); |
0f0c8159 JH |
1030 | |
1031 | if (buf[0] != '2') /* aveserver is having problems */ | |
ad93c40f | 1032 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1033 | string_sprintf("unable to quit dialogue (Responded: %s).", |
5903c6ff | 1034 | ((buf[0] != 0) ? buf : US "nothing") ), |
74f1a423 | 1035 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1036 | |
1037 | if (result == DEFER) | |
1038 | { | |
74f1a423 | 1039 | (void)close(malware_daemon_ctx.sock); |
0f0c8159 JH |
1040 | return DEFER; |
1041 | } | |
1042 | break; | |
b1f8e4f8 | 1043 | } /* aveserver */ |
c11d665d | 1044 | #endif |
8e669ac1 | 1045 | |
c11d665d | 1046 | #ifndef DISABLE_MAL_FSECURE |
b1f8e4f8 JH |
1047 | case M_FSEC: /* "fsecure" scanner type ---------------------------------- */ |
1048 | { | |
d7978c0f | 1049 | int i, bread = 0; |
0f0c8159 JH |
1050 | uschar * file_name; |
1051 | uschar av_buffer[1024]; | |
0f0c8159 JH |
1052 | static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n", |
1053 | US"CONFIGURE\tTIMEOUT\t0\n", | |
1054 | US"CONFIGURE\tMAXARCH\t5\n", | |
1055 | US"CONFIGURE\tMIME\t1\n" }; | |
1056 | ||
1057 | malware_name = NULL; | |
1058 | ||
e1d04f48 | 1059 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 JH |
1060 | scanner_name, scanner_options); |
1061 | /* pass options */ | |
1062 | memset(av_buffer, 0, sizeof(av_buffer)); | |
c11d665d | 1063 | for (i = 0; i != nelem(cmdopt); i++) |
0f0c8159 | 1064 | { |
b1f8e4f8 | 1065 | |
74f1a423 | 1066 | if (m_sock_send(malware_daemon_ctx.sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0) |
ad93c40f | 1067 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1068 | |
0a5441fc | 1069 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo); |
0f0c8159 JH |
1070 | if (bread > 0) av_buffer[bread]='\0'; |
1071 | if (bread < 0) | |
ad93c40f | 1072 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1073 | string_sprintf("unable to read answer %d (%s)", i, strerror(errno)), |
74f1a423 | 1074 | malware_daemon_ctx.sock); |
d7978c0f | 1075 | for (int j = 0; j < bread; j++) |
0f0c8159 JH |
1076 | if (av_buffer[j] == '\r' || av_buffer[j] == '\n') |
1077 | av_buffer[j] ='@'; | |
1078 | } | |
8e669ac1 | 1079 | |
0f0c8159 JH |
1080 | /* pass the mailfile to fsecure */ |
1081 | file_name = string_sprintf("SCAN\t%s\n", eml_filename); | |
b1f8e4f8 | 1082 | |
74f1a423 | 1083 | if (m_sock_send(malware_daemon_ctx.sock, file_name, Ustrlen(file_name), &errstr) < 0) |
ad93c40f | 1084 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1085 | |
0f0c8159 JH |
1086 | /* set up match */ |
1087 | /* todo also SUSPICION\t */ | |
476be7e2 JH |
1088 | if (!fsec_re) |
1089 | fsec_re = m_pcre_compile(fsec_re_str, &errstr); | |
b1f8e4f8 | 1090 | |
0f0c8159 JH |
1091 | /* read report, linewise. Apply a timeout as the Fsecure daemon |
1092 | sometimes wants an answer to "PING" but they won't tell us what */ | |
fd02dc0e | 1093 | { |
0f0c8159 JH |
1094 | uschar * p = av_buffer; |
1095 | uschar * q; | |
fd02dc0e | 1096 | |
0f0c8159 JH |
1097 | for (;;) |
1098 | { | |
80591636 | 1099 | errno = ETIMEDOUT; |
0f0c8159 | 1100 | i = av_buffer+sizeof(av_buffer)-p; |
0a5441fc | 1101 | if ((bread= ip_recv(&malware_daemon_ctx, p, i-1, tmo)) < 0) |
ad93c40f | 1102 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1103 | string_sprintf("unable to read result (%s)", strerror(errno)), |
74f1a423 | 1104 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1105 | |
755762fd | 1106 | for (p[bread] = '\0'; (q = Ustrchr(p, '\n')); p = q+1) |
0f0c8159 JH |
1107 | { |
1108 | *q = '\0'; | |
fd02dc0e | 1109 | |
0f0c8159 JH |
1110 | /* Really search for virus again? */ |
1111 | if (!malware_name) | |
1112 | /* try matcher on the line, grab substring */ | |
476be7e2 | 1113 | malware_name = m_pcre_exec(fsec_re, p); |
fd02dc0e | 1114 | |
0f0c8159 JH |
1115 | if (Ustrstr(p, "OK\tScan ok.")) |
1116 | goto fsec_found; | |
1117 | } | |
fd02dc0e | 1118 | |
0f0c8159 JH |
1119 | /* copy down the trailing partial line then read another chunk */ |
1120 | i = av_buffer+sizeof(av_buffer)-p; | |
1121 | memmove(av_buffer, p, i); | |
1122 | p = av_buffer+i; | |
fd02dc0e | 1123 | } |
b1f8e4f8 | 1124 | } |
fd02dc0e JH |
1125 | |
1126 | fsec_found: | |
b1f8e4f8 JH |
1127 | break; |
1128 | } /* fsecure */ | |
c11d665d | 1129 | #endif |
599dcb77 | 1130 | |
c11d665d | 1131 | #ifndef DISABLE_MAL_KAV |
b1f8e4f8 JH |
1132 | case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */ |
1133 | { | |
0f0c8159 JH |
1134 | time_t t; |
1135 | uschar tmpbuf[1024]; | |
1136 | uschar * scanrequest; | |
1137 | int kav_rc; | |
2decbec9 RC |
1138 | unsigned long kav_reportlen; |
1139 | int bread; | |
0f0c8159 JH |
1140 | const pcre *kav_re; |
1141 | uschar *p; | |
1142 | ||
1143 | /* get current date and time, build scan request */ | |
1144 | time(&t); | |
1145 | /* pdp note: before the eml_filename parameter, this scanned the | |
1146 | directory; not finding documentation, so we'll strip off the directory. | |
1147 | The side-effect is that the test framework scanning may end up in | |
1148 | scanning more than was requested, but for the normal interface, this is | |
1149 | fine. */ | |
1150 | ||
1151 | strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t)); | |
1152 | scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename); | |
1153 | p = Ustrrchr(scanrequest, '/'); | |
1154 | if (p) | |
1155 | *p = '\0'; | |
1156 | ||
e1d04f48 | 1157 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 JH |
1158 | scanner_name, scanner_options); |
1159 | ||
1160 | /* send scan request */ | |
74f1a423 | 1161 | if (m_sock_send(malware_daemon_ctx.sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0) |
ad93c40f | 1162 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1163 | |
0f0c8159 | 1164 | /* wait for result */ |
74f1a423 | 1165 | if (!recv_len(malware_daemon_ctx.sock, tmpbuf, 2, tmo)) |
ad93c40f | 1166 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1167 | US"unable to read 2 bytes from socket.", malware_daemon_ctx.sock); |
b1f8e4f8 | 1168 | |
0f0c8159 JH |
1169 | /* get errorcode from one nibble */ |
1170 | kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F; | |
1171 | switch(kav_rc) | |
1172 | { | |
1173 | case 5: case 6: /* improper kavdaemon configuration */ | |
ad93c40f | 1174 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1175 | US"please reconfigure kavdaemon to NOT disinfect or remove infected files.", |
74f1a423 | 1176 | malware_daemon_ctx.sock); |
0f0c8159 | 1177 | case 1: |
ad93c40f | 1178 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1179 | US"reported 'scanning not completed' (code 1).", malware_daemon_ctx.sock); |
0f0c8159 | 1180 | case 7: |
ad93c40f | 1181 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1182 | US"reported 'kavdaemon damaged' (code 7).", malware_daemon_ctx.sock); |
0f0c8159 | 1183 | } |
b1f8e4f8 | 1184 | |
4c04137d | 1185 | /* code 8 is not handled, since it is ambiguous. It appears mostly on |
0f0c8159 | 1186 | bounces where part of a file has been cut off */ |
b1f8e4f8 | 1187 | |
0f0c8159 JH |
1188 | /* "virus found" return codes (2-4) */ |
1189 | if (kav_rc > 1 && kav_rc < 5) | |
b1f8e4f8 | 1190 | { |
0f0c8159 | 1191 | int report_flag = 0; |
599dcb77 | 1192 | |
0f0c8159 JH |
1193 | /* setup default virus name */ |
1194 | malware_name = US"unknown"; | |
b1f8e4f8 | 1195 | |
0f0c8159 | 1196 | report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ]; |
b1f8e4f8 | 1197 | |
0f0c8159 JH |
1198 | /* read the report, if available */ |
1199 | if (report_flag == 1) | |
1200 | { | |
1201 | /* read report size */ | |
74f1a423 | 1202 | if (!recv_len(malware_daemon_ctx.sock, &kav_reportlen, 4, tmo)) |
ad93c40f | 1203 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1204 | US"cannot read report size", malware_daemon_ctx.sock); |
b1f8e4f8 | 1205 | |
0f0c8159 JH |
1206 | /* it's possible that avp returns av_buffer[1] == 1 but the |
1207 | reportsize is 0 (!?) */ | |
1208 | if (kav_reportlen > 0) | |
4e71661f | 1209 | { |
0f0c8159 | 1210 | /* set up match regex, depends on retcode */ |
476be7e2 JH |
1211 | if (kav_rc == 3) |
1212 | { | |
1213 | if (!kav_re_sus) kav_re_sus = m_pcre_compile(kav_re_sus_str, &errstr); | |
1214 | kav_re = kav_re_sus; | |
1215 | } | |
1216 | else | |
1217 | { | |
1218 | if (!kav_re_inf) kav_re_inf = m_pcre_compile(kav_re_inf_str, &errstr); | |
1219 | kav_re = kav_re_inf; | |
1220 | } | |
0f0c8159 | 1221 | |
6e92b3ae JH |
1222 | /* read report, linewise. Using size from stream to read amount of data |
1223 | from same stream is safe enough. */ | |
1224 | /* coverity[tainted_data] */ | |
0f0c8159 | 1225 | while (kav_reportlen > 0) |
4e71661f | 1226 | { |
74f1a423 | 1227 | if ((bread = recv_line(malware_daemon_ctx.sock, tmpbuf, sizeof(tmpbuf), tmo)) < 0) |
0f0c8159 JH |
1228 | break; |
1229 | kav_reportlen -= bread+1; | |
1230 | ||
1231 | /* try matcher on the line, grab substring */ | |
1232 | if ((malware_name = m_pcre_exec(kav_re, tmpbuf))) | |
1233 | break; | |
b1f8e4f8 JH |
1234 | } |
1235 | } | |
1236 | } | |
0f0c8159 JH |
1237 | } |
1238 | else /* no virus found */ | |
1239 | malware_name = NULL; | |
599dcb77 | 1240 | |
0f0c8159 | 1241 | break; |
599dcb77 | 1242 | } |
c11d665d | 1243 | #endif |
8544e77a | 1244 | |
c11d665d | 1245 | #ifndef DISABLE_MAL_CMDLINE |
b1f8e4f8 JH |
1246 | case M_CMDL: /* "cmdline" scanner type ---------------------------------- */ |
1247 | { | |
0f0c8159 JH |
1248 | const uschar *cmdline_scanner = scanner_options; |
1249 | const pcre *cmdline_trigger_re; | |
1250 | const pcre *cmdline_regex_re; | |
1251 | uschar * file_name; | |
1252 | uschar * commandline; | |
1253 | void (*eximsigchld)(int); | |
1254 | void (*eximsigpipe)(int); | |
1255 | FILE *scanner_out = NULL; | |
1256 | int scanner_fd; | |
1257 | FILE *scanner_record = NULL; | |
1258 | uschar linebuffer[32767]; | |
1259 | int rcnt; | |
1260 | int trigger = 0; | |
1261 | uschar *p; | |
1262 | ||
1263 | if (!cmdline_scanner) | |
ad93c40f | 1264 | return m_panic_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1265 | |
0f0c8159 JH |
1266 | /* find scanner output trigger */ |
1267 | cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1268 | "missing trigger specification", &errstr); | |
1269 | if (!cmdline_trigger_re) | |
ad93c40f | 1270 | return m_panic_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1271 | |
0f0c8159 JH |
1272 | /* find scanner name regex */ |
1273 | cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1274 | "missing virus name regex specification", &errstr); | |
1275 | if (!cmdline_regex_re) | |
ad93c40f | 1276 | return m_panic_defer(scanent, NULL, errstr); |
b1f8e4f8 | 1277 | |
0f0c8159 JH |
1278 | /* prepare scanner call; despite the naming, file_name holds a directory |
1279 | name which is documented as the value given to %s. */ | |
b1f8e4f8 | 1280 | |
0f0c8159 JH |
1281 | file_name = string_copy(eml_filename); |
1282 | p = Ustrrchr(file_name, '/'); | |
1283 | if (p) | |
1284 | *p = '\0'; | |
1285 | commandline = string_sprintf(CS cmdline_scanner, file_name); | |
b1f8e4f8 | 1286 | |
0f0c8159 JH |
1287 | /* redirect STDERR too */ |
1288 | commandline = string_sprintf("%s 2>&1", commandline); | |
b1f8e4f8 | 1289 | |
e1d04f48 | 1290 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 | 1291 | scanner_name, commandline); |
b1f8e4f8 | 1292 | |
0f0c8159 JH |
1293 | /* store exims signal handlers */ |
1294 | eximsigchld = signal(SIGCHLD,SIG_DFL); | |
1295 | eximsigpipe = signal(SIGPIPE,SIG_DFL); | |
b1f8e4f8 | 1296 | |
0f0c8159 JH |
1297 | if (!(scanner_out = popen(CS commandline,"r"))) |
1298 | { | |
1299 | int err = errno; | |
1300 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1301 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1302 | string_sprintf("call (%s) failed: %s.", commandline, strerror(err))); |
1303 | } | |
1304 | scanner_fd = fileno(scanner_out); | |
94a18f28 | 1305 | |
040721f2 | 1306 | file_name = string_sprintf("%s/%s_scanner_output", eml_dir, message_id); |
b1f8e4f8 | 1307 | |
0f0c8159 JH |
1308 | if (!(scanner_record = modefopen(file_name, "wb", SPOOL_MODE))) |
1309 | { | |
1310 | int err = errno; | |
1311 | (void) pclose(scanner_out); | |
1312 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1313 | return m_panic_defer(scanent, NULL, string_sprintf( |
0f0c8159 JH |
1314 | "opening scanner output file (%s) failed: %s.", |
1315 | file_name, strerror(err))); | |
1316 | } | |
8e669ac1 | 1317 | |
0f0c8159 JH |
1318 | /* look for trigger while recording output */ |
1319 | while ((rcnt = recv_line(scanner_fd, linebuffer, | |
1320 | sizeof(linebuffer), tmo))) | |
1321 | { | |
1322 | if (rcnt < 0) | |
93a6fce2 JH |
1323 | { |
1324 | int err = errno; | |
0f0c8159 JH |
1325 | if (rcnt == -1) |
1326 | break; | |
93a6fce2 JH |
1327 | (void) pclose(scanner_out); |
1328 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1329 | return m_panic_defer(scanent, NULL, string_sprintf( |
93a6fce2 JH |
1330 | "unable to read from scanner (%s): %s", |
1331 | commandline, strerror(err))); | |
1332 | } | |
4e71661f | 1333 | |
0f0c8159 JH |
1334 | if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record)) |
1335 | { | |
1336 | /* short write */ | |
1337 | (void) pclose(scanner_out); | |
1338 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
ad93c40f | 1339 | return m_panic_defer(scanent, NULL, string_sprintf( |
0f0c8159 | 1340 | "short write on scanner output file (%s).", file_name)); |
4e71661f | 1341 | } |
0f0c8159 JH |
1342 | putc('\n', scanner_record); |
1343 | /* try trigger match */ | |
1344 | if ( !trigger | |
1345 | && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1) | |
1346 | ) | |
1347 | trigger = 1; | |
1348 | } | |
8e669ac1 | 1349 | |
0f0c8159 JH |
1350 | (void)fclose(scanner_record); |
1351 | sep = pclose(scanner_out); | |
1352 | signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe); | |
1353 | if (sep != 0) | |
ad93c40f | 1354 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1355 | sep == -1 |
1356 | ? string_sprintf("running scanner failed: %s", strerror(sep)) | |
1357 | : string_sprintf("scanner returned error code: %d", sep)); | |
b1f8e4f8 | 1358 | |
0f0c8159 JH |
1359 | if (trigger) |
1360 | { | |
1361 | uschar * s; | |
1362 | /* setup default virus name */ | |
1363 | malware_name = US"unknown"; | |
b1f8e4f8 | 1364 | |
0f0c8159 JH |
1365 | /* re-open the scanner output file, look for name match */ |
1366 | scanner_record = fopen(CS file_name, "rb"); | |
1367 | while (fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) | |
1368 | { | |
1369 | /* try match */ | |
1370 | if ((s = m_pcre_exec(cmdline_regex_re, linebuffer))) | |
1371 | malware_name = s; | |
4e71661f | 1372 | } |
0f0c8159 JH |
1373 | (void)fclose(scanner_record); |
1374 | } | |
1375 | else /* no virus found */ | |
1376 | malware_name = NULL; | |
1377 | break; | |
b1f8e4f8 | 1378 | } /* cmdline */ |
c11d665d | 1379 | #endif |
599dcb77 | 1380 | |
c11d665d | 1381 | #ifndef DISABLE_MAL_SOPHIE |
b1f8e4f8 JH |
1382 | case M_SOPHIE: /* "sophie" scanner type --------------------------------- */ |
1383 | { | |
0f0c8159 JH |
1384 | int bread = 0; |
1385 | uschar *p; | |
1386 | uschar * file_name; | |
1387 | uschar av_buffer[1024]; | |
b1f8e4f8 | 1388 | |
0f0c8159 JH |
1389 | /* pass the scan directory to sophie */ |
1390 | file_name = string_copy(eml_filename); | |
1391 | if ((p = Ustrrchr(file_name, '/'))) | |
1392 | *p = '\0'; | |
b1f8e4f8 | 1393 | |
e1d04f48 | 1394 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan [%s]\n", |
0f0c8159 | 1395 | scanner_name, scanner_options); |
b1f8e4f8 | 1396 | |
74f1a423 JH |
1397 | if ( write(malware_daemon_ctx.sock, file_name, Ustrlen(file_name)) < 0 |
1398 | || write(malware_daemon_ctx.sock, "\n", 1) != 1 | |
0f0c8159 | 1399 | ) |
ad93c40f | 1400 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1401 | string_sprintf("unable to write to UNIX socket (%s)", scanner_options), |
74f1a423 | 1402 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1403 | |
0f0c8159 JH |
1404 | /* wait for result */ |
1405 | memset(av_buffer, 0, sizeof(av_buffer)); | |
0a5441fc | 1406 | if ((bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo)) <= 0) |
ad93c40f | 1407 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1408 | string_sprintf("unable to read from UNIX socket (%s)", scanner_options), |
74f1a423 | 1409 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1410 | |
1411 | /* infected ? */ | |
1412 | if (av_buffer[0] == '1') { | |
1413 | uschar * s = Ustrchr(av_buffer, '\n'); | |
1414 | if (s) | |
1415 | *s = '\0'; | |
1416 | malware_name = string_copy(&av_buffer[2]); | |
1417 | } | |
1418 | else if (!strncmp(CS av_buffer, "-1", 2)) | |
ad93c40f | 1419 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1420 | US"scanner reported error", malware_daemon_ctx.sock); |
0f0c8159 JH |
1421 | else /* all ok, no virus */ |
1422 | malware_name = NULL; | |
599dcb77 | 1423 | |
0f0c8159 | 1424 | break; |
8544e77a | 1425 | } |
c11d665d | 1426 | #endif |
8e669ac1 | 1427 | |
c11d665d | 1428 | #ifndef DISABLE_MAL_CLAM |
b1f8e4f8 JH |
1429 | case M_CLAMD: /* "clamd" scanner type ----------------------------------- */ |
1430 | { | |
0f0c8159 JH |
1431 | /* This code was originally contributed by David Saez */ |
1432 | /* There are three scanning methods available to us: | |
1433 | * (1) Use the SCAN command, pointing to a file in the filesystem | |
1434 | * (2) Use the STREAM command, send the data on a separate port | |
1435 | * (3) Use the zINSTREAM command, send the data inline | |
1436 | * The zINSTREAM command was introduced with ClamAV 0.95, which marked | |
1437 | * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095 | |
1438 | * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that | |
e5ba8aa7 | 1439 | * the TCP-connected daemon is actually local; otherwise we use zINSTREAM |
0f0c8159 JH |
1440 | * See Exim bug 926 for details. */ |
1441 | ||
80591636 | 1442 | uschar *p, *vname, *result_tag; |
0f0c8159 | 1443 | int bread=0; |
0f0c8159 JH |
1444 | uschar av_buffer[1024]; |
1445 | uschar *hostname = US""; | |
1446 | host_item connhost; | |
1447 | uschar *clamav_fbuf; | |
1448 | int clam_fd, result; | |
1449 | off_t fsize; | |
1450 | unsigned int fsize_uint; | |
1451 | BOOL use_scan_command = FALSE; | |
8a512ed5 | 1452 | clamd_address * cv[MAX_CLAMD_SERVERS]; |
0f0c8159 | 1453 | int num_servers = 0; |
0f0c8159 | 1454 | uint32_t send_size, send_final_zeroblock; |
4a5cbaff | 1455 | blob cmd_str; |
0f0c8159 | 1456 | |
8a512ed5 JH |
1457 | /*XXX if unixdomain socket, only one server supported. Needs fixing; |
1458 | there's no reason we should not mix local and remote servers */ | |
1459 | ||
0f0c8159 | 1460 | if (*scanner_options == '/') |
8a512ed5 JH |
1461 | { |
1462 | clamd_address * cd; | |
1463 | const uschar * sublist; | |
1464 | int subsep = ' '; | |
1465 | ||
0f0c8159 JH |
1466 | /* Local file; so we def want to use_scan_command and don't want to try |
1467 | * passing IP/port combinations */ | |
1468 | use_scan_command = TRUE; | |
f3ebb786 | 1469 | cd = (clamd_address *) store_get(sizeof(clamd_address), FALSE); |
8a512ed5 JH |
1470 | |
1471 | /* extract socket-path part */ | |
1472 | sublist = scanner_options; | |
1473 | cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0); | |
1474 | ||
1475 | /* parse options */ | |
1476 | if (clamd_option(cd, sublist, &subsep) != OK) | |
ad93c40f | 1477 | return m_panic_defer(scanent, NULL, |
8a512ed5 JH |
1478 | string_sprintf("bad option '%s'", scanner_options)); |
1479 | cv[0] = cd; | |
1480 | } | |
0f0c8159 JH |
1481 | else |
1482 | { | |
0f0c8159 JH |
1483 | /* Go through the rest of the list of host/port and construct an array |
1484 | * of servers to try. The first one is the bit we just passed from | |
1485 | * scanner_options so process that first and then scan the remainder of | |
1486 | * the address buffer */ | |
1487 | do | |
4e71661f | 1488 | { |
8a512ed5 JH |
1489 | clamd_address * cd; |
1490 | const uschar * sublist; | |
1491 | int subsep = ' '; | |
1492 | uschar * s; | |
b1f8e4f8 | 1493 | |
0f0c8159 JH |
1494 | /* The 'local' option means use the SCAN command over the network |
1495 | * socket (ie common file storage in use) */ | |
8a512ed5 JH |
1496 | /*XXX we could accept this also as a local option? */ |
1497 | if (strcmpic(scanner_options, US"local") == 0) | |
0f0c8159 JH |
1498 | { |
1499 | use_scan_command = TRUE; | |
1500 | continue; | |
1501 | } | |
b1f8e4f8 | 1502 | |
f3ebb786 | 1503 | cd = (clamd_address *) store_get(sizeof(clamd_address), FALSE); |
b1f8e4f8 | 1504 | |
0f0c8159 | 1505 | /* extract host and port part */ |
8a512ed5 JH |
1506 | sublist = scanner_options; |
1507 | if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
1508 | { | |
ad93c40f | 1509 | (void) m_panic_defer(scanent, NULL, |
8a512ed5 JH |
1510 | string_sprintf("missing address: '%s'", scanner_options)); |
1511 | continue; | |
1512 | } | |
1513 | if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0))) | |
0f0c8159 | 1514 | { |
ad93c40f | 1515 | (void) m_panic_defer(scanent, NULL, |
8a512ed5 JH |
1516 | string_sprintf("missing port: '%s'", scanner_options)); |
1517 | continue; | |
1518 | } | |
93a6fce2 | 1519 | cd->tcp_port = atoi(CS s); |
8a512ed5 JH |
1520 | |
1521 | /* parse options */ | |
1522 | /*XXX should these options be common over scanner types? */ | |
1523 | if (clamd_option(cd, sublist, &subsep) != OK) | |
ad93c40f | 1524 | return m_panic_defer(scanent, NULL, |
8a512ed5 | 1525 | string_sprintf("bad option '%s'", scanner_options)); |
b1f8e4f8 | 1526 | |
8a512ed5 | 1527 | cv[num_servers++] = cd; |
0f0c8159 JH |
1528 | if (num_servers >= MAX_CLAMD_SERVERS) |
1529 | { | |
ad93c40f | 1530 | (void) m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1531 | US"More than " MAX_CLAMD_SERVERS_S " clamd servers " |
1532 | "specified; only using the first " MAX_CLAMD_SERVERS_S ); | |
1533 | break; | |
1534 | } | |
8a512ed5 JH |
1535 | } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep, |
1536 | NULL, 0))); | |
8e669ac1 | 1537 | |
0f0c8159 JH |
1538 | /* check if we have at least one server */ |
1539 | if (!num_servers) | |
ad93c40f | 1540 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1541 | US"no useable server addresses in malware configuration option."); |
1542 | } | |
b1f8e4f8 | 1543 | |
0f0c8159 JH |
1544 | /* See the discussion of response formats below to see why we really |
1545 | don't like colons in filenames when passing filenames to ClamAV. */ | |
1546 | if (use_scan_command && Ustrchr(eml_filename, ':')) | |
ad93c40f | 1547 | return m_panic_defer(scanent, NULL, |
0f0c8159 JH |
1548 | string_sprintf("local/SCAN mode incompatible with" \ |
1549 | " : in path to email filename [%s]", eml_filename)); | |
b1f8e4f8 | 1550 | |
4a5cbaff JH |
1551 | /* Set up the very first data we will be sending */ |
1552 | if (!use_scan_command) | |
4a5cbaff | 1553 | { cmd_str.data = US"zINSTREAM"; cmd_str.len = 10; } |
4a5cbaff JH |
1554 | else |
1555 | { | |
1556 | cmd_str.data = string_sprintf("SCAN %s\n", eml_filename); | |
1557 | cmd_str.len = Ustrlen(cmd_str.data); | |
1558 | } | |
1559 | ||
0f0c8159 JH |
1560 | /* We have some network servers specified */ |
1561 | if (num_servers) | |
1562 | { | |
1563 | /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd | |
1564 | * only supports AF_INET, but we should probably be looking to the | |
1565 | * future and rewriting this to be protocol-independent anyway. */ | |
b1f8e4f8 | 1566 | |
0f0c8159 JH |
1567 | while (num_servers > 0) |
1568 | { | |
4a5cbaff | 1569 | int i = random_number(num_servers); |
8a512ed5 | 1570 | clamd_address * cd = cv[i]; |
b1f8e4f8 | 1571 | |
e1d04f48 | 1572 | DEBUG(D_acl) debug_printf_indent("trying server name %s, port %u\n", |
8a512ed5 | 1573 | cd->hostspec, cd->tcp_port); |
0f0c8159 JH |
1574 | |
1575 | /* Lookup the host. This is to ensure that we connect to the same IP | |
1576 | * on both connections (as one host could resolve to multiple ips) */ | |
8a512ed5 | 1577 | for (;;) |
0f0c8159 | 1578 | { |
b536a578 | 1579 | /*XXX we trust that the cmd_str is ideempotent */ |
74f1a423 | 1580 | if ((malware_daemon_ctx.sock = m_tcpsocket(cd->hostspec, cd->tcp_port, |
4a5cbaff | 1581 | &connhost, &errstr, &cmd_str)) >= 0) |
8a512ed5 JH |
1582 | { |
1583 | /* Connection successfully established with a server */ | |
1584 | hostname = cd->hostspec; | |
4a5cbaff | 1585 | cmd_str.len = 0; |
8a512ed5 JH |
1586 | break; |
1587 | } | |
1588 | if (cd->retry <= 0) break; | |
1589 | while (cd->retry > 0) cd->retry = sleep(cd->retry); | |
4e71661f | 1590 | } |
74f1a423 | 1591 | if (malware_daemon_ctx.sock >= 0) |
8a512ed5 | 1592 | break; |
b1f8e4f8 | 1593 | |
ad93c40f | 1594 | (void) m_panic_defer(scanent, CUS callout_address, errstr); |
0f0c8159 JH |
1595 | |
1596 | /* Remove the server from the list. XXX We should free the memory */ | |
1597 | num_servers--; | |
8a512ed5 JH |
1598 | for (; i < num_servers; i++) |
1599 | cv[i] = cv[i+1]; | |
4e71661f | 1600 | } |
8e669ac1 | 1601 | |
0f0c8159 | 1602 | if (num_servers == 0) |
ad93c40f | 1603 | return m_panic_defer(scanent, NULL, US"all servers failed"); |
0f0c8159 JH |
1604 | } |
1605 | else | |
8a512ed5 JH |
1606 | for (;;) |
1607 | { | |
74f1a423 | 1608 | if ((malware_daemon_ctx.sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0) |
8a512ed5 JH |
1609 | { |
1610 | hostname = cv[0]->hostspec; | |
1611 | break; | |
1612 | } | |
1613 | if (cv[0]->retry <= 0) | |
ad93c40f | 1614 | return m_panic_defer(scanent, CUS callout_address, errstr); |
8a512ed5 JH |
1615 | while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry); |
1616 | } | |
b1f8e4f8 | 1617 | |
0f0c8159 JH |
1618 | /* have socket in variable "sock"; command to use is semi-independent of |
1619 | * the socket protocol. We use SCAN if is local (either Unix/local | |
1620 | * domain socket, or explicitly told local) else we stream the data. | |
1621 | * How we stream the data depends upon how we were built. */ | |
1622 | ||
1623 | if (!use_scan_command) | |
1624 | { | |
0f0c8159 JH |
1625 | /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data> |
1626 | chunks, <n> a 4-byte number (network order), terminated by a zero-length | |
1627 | chunk. */ | |
b1f8e4f8 | 1628 | |
e1d04f48 | 1629 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
1630 | "Malware scan: issuing %s new-style remote scan (zINSTREAM)\n", |
1631 | scanner_name); | |
b1f8e4f8 | 1632 | |
4a5cbaff JH |
1633 | /* Pass the string to ClamAV (10 = "zINSTREAM\0"), if not already sent */ |
1634 | if (cmd_str.len) | |
74f1a423 | 1635 | if (send(malware_daemon_ctx.sock, cmd_str.data, cmd_str.len, 0) < 0) |
ad93c40f | 1636 | return m_panic_defer_3(scanent, CUS hostname, |
4a5cbaff JH |
1637 | string_sprintf("unable to send zINSTREAM to socket (%s)", |
1638 | strerror(errno)), | |
74f1a423 | 1639 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1640 | |
0f0c8159 JH |
1641 | /* calc file size */ |
1642 | if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) | |
1643 | { | |
1644 | int err = errno; | |
ad93c40f | 1645 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1646 | string_sprintf("can't open spool file %s: %s", |
1647 | eml_filename, strerror(err)), | |
74f1a423 | 1648 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1649 | } |
1650 | if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) | |
1651 | { | |
d315eda1 JH |
1652 | int err; |
1653 | b_seek: err = errno; | |
e5ba8aa7 | 1654 | (void)close(clam_fd); |
ad93c40f | 1655 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1656 | string_sprintf("can't seek spool file %s: %s", |
1657 | eml_filename, strerror(err)), | |
74f1a423 | 1658 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1659 | } |
1660 | fsize_uint = (unsigned int) fsize; | |
1661 | if ((off_t)fsize_uint != fsize) | |
1662 | { | |
e5ba8aa7 | 1663 | (void)close(clam_fd); |
ad93c40f | 1664 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1665 | string_sprintf("seeking spool file %s, size overflow", |
1666 | eml_filename), | |
74f1a423 | 1667 | malware_daemon_ctx.sock); |
0f0c8159 | 1668 | } |
d315eda1 JH |
1669 | if (lseek(clam_fd, 0, SEEK_SET) < 0) |
1670 | goto b_seek; | |
b1f8e4f8 | 1671 | |
f3ebb786 | 1672 | if (!(clamav_fbuf = store_malloc(fsize_uint))) |
0f0c8159 | 1673 | { |
e5ba8aa7 | 1674 | (void)close(clam_fd); |
ad93c40f | 1675 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1676 | string_sprintf("unable to allocate memory %u for file (%s)", |
1677 | fsize_uint, eml_filename), | |
74f1a423 | 1678 | malware_daemon_ctx.sock); |
0f0c8159 | 1679 | } |
b1f8e4f8 | 1680 | |
0f0c8159 JH |
1681 | if ((result = read(clam_fd, clamav_fbuf, fsize_uint)) < 0) |
1682 | { | |
1683 | int err = errno; | |
f3ebb786 | 1684 | store_free(clamav_fbuf); (void)close(clam_fd); |
ad93c40f | 1685 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 JH |
1686 | string_sprintf("can't read spool file %s: %s", |
1687 | eml_filename, strerror(err)), | |
74f1a423 | 1688 | malware_daemon_ctx.sock); |
0f0c8159 JH |
1689 | } |
1690 | (void)close(clam_fd); | |
b1f8e4f8 | 1691 | |
0f0c8159 | 1692 | /* send file body to socket */ |
0f0c8159 JH |
1693 | send_size = htonl(fsize_uint); |
1694 | send_final_zeroblock = 0; | |
74f1a423 JH |
1695 | if ((send(malware_daemon_ctx.sock, &send_size, sizeof(send_size), 0) < 0) || |
1696 | (send(malware_daemon_ctx.sock, clamav_fbuf, fsize_uint, 0) < 0) || | |
1697 | (send(malware_daemon_ctx.sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0)) | |
0f0c8159 | 1698 | { |
f3ebb786 | 1699 | store_free(clamav_fbuf); |
ad93c40f | 1700 | return m_panic_defer_3(scanent, NULL, |
0f0c8159 | 1701 | string_sprintf("unable to send file body to socket (%s)", hostname), |
74f1a423 | 1702 | malware_daemon_ctx.sock); |
4e71661f | 1703 | } |
f3ebb786 | 1704 | store_free(clamav_fbuf); |
0f0c8159 JH |
1705 | } |
1706 | else | |
1707 | { /* use scan command */ | |
1708 | /* Send a SCAN command pointing to a filename; then in the then in the | |
1709 | * scan-method-neutral part, read the response back */ | |
1710 | ||
1711 | /* ================================================================= */ | |
1712 | ||
1713 | /* Prior to the reworking post-Exim-4.72, this scanned a directory, | |
1714 | which dates to when ClamAV needed us to break apart the email into the | |
1715 | MIME parts (eg, with the now deprecated demime condition coming first). | |
1716 | Some time back, ClamAV gained the ability to deconstruct the emails, so | |
1717 | doing this would actually have resulted in the mail attachments being | |
1718 | scanned twice, in the broken out files and from the original .eml. | |
1719 | Since ClamAV now handles emails (and has for quite some time) we can | |
1720 | just use the email file itself. */ | |
4a5cbaff | 1721 | /* Pass the string to ClamAV (7 = "SCAN \n" + \0), if not already sent */ |
0f0c8159 | 1722 | |
e1d04f48 | 1723 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
1724 | "Malware scan: issuing %s local-path scan [%s]\n", |
1725 | scanner_name, scanner_options); | |
b1f8e4f8 | 1726 | |
4a5cbaff | 1727 | if (cmd_str.len) |
74f1a423 | 1728 | if (send(malware_daemon_ctx.sock, cmd_str.data, cmd_str.len, 0) < 0) |
ad93c40f | 1729 | return m_panic_defer_3(scanent, CUS callout_address, |
4a5cbaff | 1730 | string_sprintf("unable to write to socket (%s)", strerror(errno)), |
74f1a423 | 1731 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1732 | |
0f0c8159 JH |
1733 | /* Do not shut down the socket for writing; a user report noted that |
1734 | * clamd 0.70 does not react well to this. */ | |
1735 | } | |
1736 | /* Commands have been sent, no matter which scan method or connection | |
1737 | * type we're using; now just read the result, independent of method. */ | |
1738 | ||
1739 | /* Read the result */ | |
1740 | memset(av_buffer, 0, sizeof(av_buffer)); | |
0a5441fc | 1741 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo); |
74f1a423 JH |
1742 | (void)close(malware_daemon_ctx.sock); |
1743 | malware_daemon_ctx.sock = -1; | |
1744 | malware_daemon_ctx.tls_ctx = NULL; | |
0f0c8159 JH |
1745 | |
1746 | if (bread <= 0) | |
ad93c40f | 1747 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1748 | string_sprintf("unable to read from socket (%s)", |
1749 | errno == 0 ? "EOF" : strerror(errno))); | |
1750 | ||
1751 | if (bread == sizeof(av_buffer)) | |
ad93c40f | 1752 | return m_panic_defer(scanent, CUS callout_address, |
0ea02355 | 1753 | US"buffer too small"); |
0f0c8159 JH |
1754 | /* We're now assured of a NULL at the end of av_buffer */ |
1755 | ||
1756 | /* Check the result. ClamAV returns one of two result formats. | |
1757 | In the basic mode, the response is of the form: | |
1758 | infected: -> "<filename>: <virusname> FOUND" | |
1759 | not-infected: -> "<filename>: OK" | |
1760 | error: -> "<filename>: <errcode> ERROR | |
1761 | If the ExtendedDetectionInfo option has been turned on, then we get: | |
1762 | "<filename>: <virusname>(<virushash>:<virussize>) FOUND" | |
1763 | for the infected case. Compare: | |
1764 | /tmp/eicar.com: Eicar-Test-Signature FOUND | |
1765 | /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND | |
1766 | ||
1767 | In the streaming case, clamd uses the filename "stream" which you should | |
1768 | be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The | |
1769 | client app will replace "stream" with the original filename before returning | |
1770 | results to stdout, but the trace shows the data). | |
1771 | ||
1772 | We will assume that the pathname passed to clamd from Exim does not contain | |
1773 | a colon. We will have whined loudly above if the eml_filename does (and we're | |
1774 | passing a filename to clamd). */ | |
1775 | ||
1776 | if (!(*av_buffer)) | |
ad93c40f | 1777 | return m_panic_defer(scanent, CUS callout_address, |
0ea02355 | 1778 | US"ClamAV returned null"); |
0f0c8159 JH |
1779 | |
1780 | /* strip newline at the end (won't be present for zINSTREAM) | |
1781 | (also any trailing whitespace, which shouldn't exist, but we depend upon | |
1782 | this below, so double-check) */ | |
1783 | p = av_buffer + Ustrlen(av_buffer) - 1; | |
1784 | if (*p == '\n') *p = '\0'; | |
1785 | ||
e1d04f48 | 1786 | DEBUG(D_acl) debug_printf_indent("Malware response: %s\n", av_buffer); |
0f0c8159 JH |
1787 | |
1788 | while (isspace(*--p) && (p > av_buffer)) | |
1789 | *p = '\0'; | |
1790 | if (*p) ++p; | |
0f0c8159 JH |
1791 | |
1792 | /* colon in returned output? */ | |
80591636 | 1793 | if(!(p = Ustrchr(av_buffer,':'))) |
ad93c40f | 1794 | return m_panic_defer(scanent, CUS callout_address, string_sprintf( |
0f0c8159 JH |
1795 | "ClamAV returned malformed result (missing colon): %s", |
1796 | av_buffer)); | |
1797 | ||
1798 | /* strip filename */ | |
1799 | while (*p && isspace(*++p)) /**/; | |
1800 | vname = p; | |
1801 | ||
1802 | /* It would be bad to encounter a virus with "FOUND" in part of the name, | |
1803 | but we should at least be resistant to it. */ | |
1804 | p = Ustrrchr(vname, ' '); | |
1805 | result_tag = p ? p+1 : vname; | |
1806 | ||
1807 | if (Ustrcmp(result_tag, "FOUND") == 0) | |
1808 | { | |
1809 | /* p should still be the whitespace before the result_tag */ | |
1810 | while (isspace(*p)) --p; | |
1811 | *++p = '\0'; | |
1812 | /* Strip off the extended information too, which will be in parens | |
1813 | after the virus name, with no intervening whitespace. */ | |
1814 | if (*--p == ')') | |
4e71661f | 1815 | { |
0f0c8159 JH |
1816 | /* "(hash:size)", so previous '(' will do; if not found, we have |
1817 | a curious virus name, but not an error. */ | |
1818 | p = Ustrrchr(vname, '('); | |
1819 | if (p) | |
1820 | *p = '\0'; | |
4e71661f | 1821 | } |
0f0c8159 | 1822 | malware_name = string_copy(vname); |
e1d04f48 | 1823 | DEBUG(D_acl) debug_printf_indent("Malware found, name \"%s\"\n", malware_name); |
b1f8e4f8 | 1824 | |
0f0c8159 JH |
1825 | } |
1826 | else if (Ustrcmp(result_tag, "ERROR") == 0) | |
ad93c40f | 1827 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 | 1828 | string_sprintf("ClamAV returned: %s", av_buffer)); |
b1f8e4f8 | 1829 | |
0f0c8159 JH |
1830 | else if (Ustrcmp(result_tag, "OK") == 0) |
1831 | { | |
1832 | /* Everything should be OK */ | |
1833 | malware_name = NULL; | |
e1d04f48 | 1834 | DEBUG(D_acl) debug_printf_indent("Malware not found\n"); |
b1f8e4f8 | 1835 | |
0f0c8159 JH |
1836 | } |
1837 | else | |
ad93c40f | 1838 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1839 | string_sprintf("unparseable response from ClamAV: {%s}", av_buffer)); |
1840 | ||
1841 | break; | |
b1f8e4f8 | 1842 | } /* clamd */ |
c11d665d | 1843 | #endif |
b1f8e4f8 | 1844 | |
c11d665d | 1845 | #ifndef DISABLE_MAL_SOCK |
b1f8e4f8 | 1846 | case M_SOCK: /* "sock" scanner type ------------------------------------- */ |
0f0c8159 JH |
1847 | /* This code was derived by Martin Poole from the clamd code contributed |
1848 | by David Saez and the cmdline code | |
1849 | */ | |
b1f8e4f8 | 1850 | { |
0f0c8159 JH |
1851 | int bread; |
1852 | uschar * commandline; | |
1853 | uschar av_buffer[1024]; | |
1854 | uschar * linebuffer; | |
1855 | uschar * sockline_scanner; | |
1856 | uschar sockline_scanner_default[] = "%s\n"; | |
1857 | const pcre *sockline_trig_re; | |
1858 | const pcre *sockline_name_re; | |
1859 | ||
1860 | /* find scanner command line */ | |
ac4d558b JH |
1861 | if ( (sockline_scanner = string_nextinlist(&av_scanner_work, &sep, |
1862 | NULL, 0)) | |
1863 | && *sockline_scanner | |
1864 | ) | |
0f0c8159 JH |
1865 | { /* check for no expansions apart from one %s */ |
1866 | uschar * s = Ustrchr(sockline_scanner, '%'); | |
1867 | if (s++) | |
1868 | if ((*s != 's' && *s != '%') || Ustrchr(s+1, '%')) | |
ad93c40f | 1869 | return m_panic_defer_3(scanent, NULL, |
74f1a423 | 1870 | US"unsafe sock scanner call spec", malware_daemon_ctx.sock); |
0f0c8159 JH |
1871 | } |
1872 | else | |
1873 | sockline_scanner = sockline_scanner_default; | |
ac4d558b JH |
1874 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "cmdline: ", |
1875 | string_printing(sockline_scanner)); | |
b1f8e4f8 | 1876 | |
0f0c8159 JH |
1877 | /* find scanner output trigger */ |
1878 | sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1879 | "missing trigger specification", &errstr); | |
1880 | if (!sockline_trig_re) | |
74f1a423 | 1881 | return m_panic_defer_3(scanent, NULL, errstr, malware_daemon_ctx.sock); |
b1f8e4f8 | 1882 | |
0f0c8159 JH |
1883 | /* find virus name regex */ |
1884 | sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep, | |
1885 | "missing virus name regex specification", &errstr); | |
1886 | if (!sockline_name_re) | |
74f1a423 | 1887 | return m_panic_defer_3(scanent, NULL, errstr, malware_daemon_ctx.sock); |
b1f8e4f8 | 1888 | |
0f0c8159 | 1889 | /* prepare scanner call - security depends on expansions check above */ |
040721f2 | 1890 | commandline = string_sprintf( CS sockline_scanner, CS eml_filename); |
ac4d558b JH |
1891 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "expanded: ", |
1892 | string_printing(commandline)); | |
b1f8e4f8 | 1893 | |
0f0c8159 | 1894 | /* Pass the command string to the socket */ |
74f1a423 | 1895 | if (m_sock_send(malware_daemon_ctx.sock, commandline, Ustrlen(commandline), &errstr) < 0) |
ad93c40f | 1896 | return m_panic_defer(scanent, CUS callout_address, errstr); |
b1f8e4f8 | 1897 | |
0f0c8159 | 1898 | /* Read the result */ |
0a5441fc | 1899 | bread = ip_recv(&malware_daemon_ctx, av_buffer, sizeof(av_buffer), tmo); |
b1f8e4f8 | 1900 | |
0f0c8159 | 1901 | if (bread <= 0) |
ad93c40f | 1902 | return m_panic_defer_3(scanent, CUS callout_address, |
0f0c8159 | 1903 | string_sprintf("unable to read from socket (%s)", strerror(errno)), |
74f1a423 | 1904 | malware_daemon_ctx.sock); |
b1f8e4f8 | 1905 | |
0f0c8159 | 1906 | if (bread == sizeof(av_buffer)) |
ad93c40f | 1907 | return m_panic_defer_3(scanent, CUS callout_address, |
74f1a423 | 1908 | US"buffer too small", malware_daemon_ctx.sock); |
0f0c8159 JH |
1909 | av_buffer[bread] = '\0'; |
1910 | linebuffer = string_copy(av_buffer); | |
ac4d558b JH |
1911 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "answer: ", |
1912 | string_printing(linebuffer)); | |
b1f8e4f8 | 1913 | |
0f0c8159 JH |
1914 | /* try trigger match */ |
1915 | if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) | |
1916 | { | |
1917 | if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer))) | |
1918 | malware_name = US "unknown"; | |
ac4d558b JH |
1919 | DEBUG(D_acl) debug_printf_indent("%15s%10s'%s'\n", "", "name: ", |
1920 | string_printing(malware_name)); | |
b1f8e4f8 | 1921 | } |
0f0c8159 JH |
1922 | else /* no virus found */ |
1923 | malware_name = NULL; | |
1924 | break; | |
8523533c | 1925 | } |
c11d665d | 1926 | #endif |
8e669ac1 | 1927 | |
c11d665d | 1928 | #ifndef DISABLE_MAL_MKS |
b1f8e4f8 JH |
1929 | case M_MKSD: /* "mksd" scanner type ------------------------------------- */ |
1930 | { | |
0f0c8159 JH |
1931 | char *mksd_options_end; |
1932 | int mksd_maxproc = 1; /* default, if no option supplied */ | |
1933 | int retval; | |
b1f8e4f8 | 1934 | |
0f0c8159 JH |
1935 | if (scanner_options) |
1936 | { | |
1937 | mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10); | |
1938 | if ( *scanner_options == '\0' | |
1939 | || *mksd_options_end != '\0' | |
1940 | || mksd_maxproc < 1 | |
1941 | || mksd_maxproc > 32 | |
1942 | ) | |
ad93c40f | 1943 | return m_panic_defer(scanent, CUS callout_address, |
0f0c8159 JH |
1944 | string_sprintf("invalid option '%s'", scanner_options)); |
1945 | } | |
8e669ac1 | 1946 | |
74f1a423 | 1947 | if((malware_daemon_ctx.sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0) |
ad93c40f | 1948 | return m_panic_defer(scanent, CUS callout_address, errstr); |
8e669ac1 | 1949 | |
0f0c8159 | 1950 | malware_name = NULL; |
94a18f28 | 1951 | |
e1d04f48 | 1952 | DEBUG(D_acl) debug_printf_indent("Malware scan: issuing %s scan\n", scanner_name); |
94a18f28 | 1953 | |
74f1a423 | 1954 | if ((retval = mksd_scan_packed(scanent, malware_daemon_ctx.sock, eml_filename, tmo)) != OK) |
0f0c8159 | 1955 | { |
74f1a423 | 1956 | close (malware_daemon_ctx.sock); |
0f0c8159 JH |
1957 | return retval; |
1958 | } | |
1959 | break; | |
8523533c | 1960 | } |
c11d665d | 1961 | #endif |
0f0c8159 | 1962 | |
c11d665d | 1963 | #ifndef DISABLE_MAL_AVAST |
b6fbf22d JH |
1964 | case M_AVAST: /* "avast" scanner type ----------------------------------- */ |
1965 | { | |
b6fbf22d JH |
1966 | uschar buf[1024]; |
1967 | uschar * scanrequest; | |
b6fbf22d | 1968 | enum {AVA_HELO, AVA_OPT, AVA_RSP, AVA_DONE} avast_stage; |
0f0c8159 | 1969 | int nread; |
ad93c40f | 1970 | uschar * error_message = NULL; |
4fe93c4b HSHR |
1971 | BOOL more_data = FALSE; |
1972 | BOOL strict = TRUE; | |
b6fbf22d JH |
1973 | |
1974 | /* According to Martin Tuma @avast the protocol uses "escaped | |
1975 | whitespace", that is, every embedded whitespace is backslash | |
1976 | escaped, as well as backslash is protected by backslash. | |
1977 | The returned lines contain the name of the scanned file, a tab | |
1978 | and the [ ] marker. | |
1979 | [+] - not infected | |
1980 | [L] - infected | |
aded2255 | 1981 | [E] - some error occurred |
71bb51e0 HSHR |
1982 | Such marker follows the first non-escaped TAB. For more information |
1983 | see avast-protocol(5) | |
ad93c40f HSHR |
1984 | |
1985 | We observed two cases: | |
1986 | -> SCAN /file | |
1987 | <- /file [E]0.0 Error 13 Permission denied | |
1988 | <- 451 SCAN Engine error 13 permission denied | |
1989 | ||
1990 | -> SCAN /file | |
1991 | <- /file… [E]3.0 Error 41120 The file is a decompression bomb | |
1992 | <- /file… [+]2.0 | |
1993 | <- /file… [+]2.0 0 Eicar Test Virus!!! | |
1994 | <- 200 SCAN OK | |
1995 | ||
1996 | If the scanner returns 4xx, DEFER is a good decision, combined | |
1997 | with a panic log entry, to get the admin's attention. | |
1998 | ||
1999 | If the scanner returns 200, we reject it as malware, if found any, | |
2000 | or, in case of an error, we set the malware message to the error | |
2001 | string. | |
2002 | ||
2003 | Some of the >= 42000 errors are message related - usually some | |
2004 | broken archives etc, but some of them are e.g. license related. | |
2005 | Once the license expires the engine starts returning errors for | |
2006 | every scanning attempt. I¹ have the full list of the error codes | |
2007 | but it is not a public API and is subject to change. It is hard | |
2008 | for me to say what you should do in case of an engine error. You | |
2009 | can have a “Treat * unscanned file as infection” policy or “Treat | |
2010 | unscanned file as clean” policy. ¹) Jakub Bednar | |
2011 | ||
2012 | */ | |
2013 | ||
476be7e2 JH |
2014 | if ( ( !ava_re_clean |
2015 | && !(ava_re_clean = m_pcre_compile(ava_re_clean_str, &errstr))) | |
2016 | || ( !ava_re_virus | |
2017 | && !(ava_re_virus = m_pcre_compile(ava_re_virus_str, &errstr))) | |
ad93c40f HSHR |
2018 | || ( !ava_re_error |
2019 | && !(ava_re_error = m_pcre_compile(ava_re_error_str, &errstr))) | |
b6fbf22d | 2020 | ) |
ad93c40f | 2021 | return malware_panic_defer(errstr); |
b6fbf22d JH |
2022 | |
2023 | /* wait for result */ | |
0f0c8159 | 2024 | for (avast_stage = AVA_HELO; |
74f1a423 | 2025 | (nread = recv_line(malware_daemon_ctx.sock, buf, sizeof(buf), tmo)) > 0; |
0f0c8159 | 2026 | ) |
b6fbf22d JH |
2027 | { |
2028 | int slen = Ustrlen(buf); | |
94431adb | 2029 | if (slen >= 1) |
b6fbf22d | 2030 | { |
71bb51e0 HSHR |
2031 | |
2032 | /* Multi line responses are bracketed between 210 … and nnn … */ | |
2033 | if (Ustrncmp(buf, "210", 3) == 0) | |
2034 | { | |
2035 | more_data = 1; | |
2036 | continue; | |
2037 | } | |
2038 | else if (more_data && isdigit(buf[0])) more_data = 0; | |
2039 | ||
b6fbf22d JH |
2040 | switch (avast_stage) |
2041 | { | |
2042 | case AVA_HELO: | |
71bb51e0 | 2043 | if (more_data) continue; |
b6fbf22d JH |
2044 | if (Ustrncmp(buf, "220", 3) != 0) |
2045 | goto endloop; /* require a 220 */ | |
2046 | goto sendreq; | |
2047 | ||
2048 | case AVA_OPT: | |
71bb51e0 | 2049 | if (more_data) continue; |
b6fbf22d JH |
2050 | if (Ustrncmp(buf, "200", 3) != 0) |
2051 | goto endloop; /* require a 200 */ | |
2052 | ||
2053 | sendreq: | |
2054 | { | |
2055 | int len; | |
2056 | /* Check for another option to send. Newline-terminate it. */ | |
2057 | if ((scanrequest = string_nextinlist(&av_scanner_work, &sep, | |
2058 | NULL, 0))) | |
2059 | { | |
eb445b04 HSHR |
2060 | if (Ustrcmp(scanrequest, "pass_unscanned") == 0) |
2061 | { | |
2062 | DEBUG(D_acl) debug_printf_indent("pass unscanned files as clean\n"); | |
2063 | strict = FALSE; | |
2064 | goto sendreq; | |
2065 | } | |
b6fbf22d JH |
2066 | scanrequest = string_sprintf("%s\n", scanrequest); |
2067 | avast_stage = AVA_OPT; /* just sent option */ | |
71bb51e0 | 2068 | DEBUG(D_acl) debug_printf_indent("send to avast OPTION: %s", scanrequest); |
b6fbf22d JH |
2069 | } |
2070 | else | |
2071 | { | |
040721f2 | 2072 | scanrequest = string_sprintf("SCAN %s\n", eml_dir); |
b6fbf22d | 2073 | avast_stage = AVA_RSP; /* just sent command */ |
71bb51e0 | 2074 | DEBUG(D_acl) debug_printf_indent("send to avast REQUEST: SCAN %s\n", eml_dir); |
b6fbf22d JH |
2075 | } |
2076 | ||
2077 | /* send config-cmd or scan-request to socket */ | |
2078 | len = Ustrlen(scanrequest); | |
74f1a423 | 2079 | if (send(malware_daemon_ctx.sock, scanrequest, len, 0) == -1) |
b6fbf22d JH |
2080 | { |
2081 | scanrequest[len-1] = '\0'; | |
ad93c40f | 2082 | return m_panic_defer_3(scanent, CUS callout_address, string_sprintf( |
b6fbf22d | 2083 | "unable to send request '%s' to socket (%s): %s", |
74f1a423 | 2084 | scanrequest, scanner_options, strerror(errno)), malware_daemon_ctx.sock); |
b6fbf22d JH |
2085 | } |
2086 | break; | |
2087 | } | |
2088 | ||
2089 | case AVA_RSP: | |
71bb51e0 | 2090 | |
91e974f5 | 2091 | if (isdigit(buf[0])) /* We're done */ |
71bb51e0 | 2092 | goto endloop; |
71bb51e0 | 2093 | |
91e974f5 | 2094 | if (malware_name) /* Nothing else matters, just read on */ |
ad93c40f | 2095 | break; |
b6fbf22d | 2096 | |
91e974f5 | 2097 | if (pcre_exec(ava_re_clean, NULL, CS buf, slen, 0, 0, NULL, 0) == 0) |
b6fbf22d JH |
2098 | break; |
2099 | ||
4fe93c4b | 2100 | if ((malware_name = m_pcre_exec(ava_re_virus, buf))) |
ad93c40f HSHR |
2101 | { |
2102 | unescape(malware_name); | |
2103 | DEBUG(D_acl) | |
2104 | debug_printf_indent("unescaped malware name: '%s'\n", malware_name); | |
2105 | break; | |
2106 | } | |
2107 | ||
91e974f5 | 2108 | if (strict) /* treat scanner errors as malware */ |
ad93c40f | 2109 | { |
4fe93c4b | 2110 | if ((malware_name = m_pcre_exec(ava_re_error, buf))) |
91e974f5 HSHR |
2111 | { |
2112 | unescape(malware_name); | |
2113 | DEBUG(D_acl) | |
2114 | debug_printf_indent("unescaped error message: '%s'\n", malware_name); | |
2115 | break; | |
2116 | } | |
ad93c40f | 2117 | } |
91e974f5 | 2118 | else if (pcre_exec(ava_re_error, NULL, CS buf, slen, 0, 0, NULL, 0) == 0) |
eb445b04 HSHR |
2119 | { |
2120 | log_write(0, LOG_MAIN, "internal scanner error (ignored): %s", buf); | |
2121 | break; | |
2122 | } | |
2123 | ||
83d2a861 | 2124 | /* here also for any unexpected response from the scanner */ |
eb445b04 | 2125 | DEBUG(D_acl) debug_printf("avast response not handled: '%s'\n", buf); |
91e974f5 | 2126 | |
b6fbf22d | 2127 | goto endloop; |
755762fd | 2128 | |
83d2a861 | 2129 | default: log_write(0, LOG_PANIC, "%s:%d:%s: should not happen", |
755762fd | 2130 | __FILE__, __LINE__, __FUNCTION__); |
b6fbf22d | 2131 | } |
0f0c8159 | 2132 | } |
b6fbf22d | 2133 | } |
91e974f5 | 2134 | |
b6fbf22d JH |
2135 | endloop: |
2136 | ||
46682a67 JH |
2137 | if (nread == -1) error_message = US"EOF from scanner"; |
2138 | else if (nread < 0) error_message = US"timeout from scanner"; | |
2139 | else if (nread == 0) error_message = US"got nothing from scanner"; | |
91e974f5 | 2140 | else if (buf[0] != '2') error_message = buf; |
ad93c40f | 2141 | |
91e974f5 | 2142 | DEBUG(D_acl) debug_printf_indent("sent to avast QUIT\n"); |
74f1a423 | 2143 | if (send(malware_daemon_ctx.sock, "QUIT\n", 5, 0) == -1) |
91e974f5 HSHR |
2144 | return m_panic_defer_3(scanent, CUS callout_address, |
2145 | string_sprintf("unable to send quit request to socket (%s): %s", | |
74f1a423 | 2146 | scanner_options, strerror(errno)), malware_daemon_ctx.sock); |
91e974f5 HSHR |
2147 | |
2148 | if (error_message) | |
74f1a423 | 2149 | return m_panic_defer_3(scanent, CUS callout_address, error_message, malware_daemon_ctx.sock); |
ad93c40f | 2150 | |
b6fbf22d | 2151 | } |
c11d665d | 2152 | #endif |
0f0c8159 | 2153 | } /* scanner type switch */ |
8523533c | 2154 | |
74f1a423 JH |
2155 | if (malware_daemon_ctx.sock >= 0) |
2156 | (void) close (malware_daemon_ctx.sock); | |
0f0c8159 | 2157 | malware_ok = TRUE; /* set "been here, done that" marker */ |
b1f8e4f8 | 2158 | } |
8523533c | 2159 | |
0f0c8159 JH |
2160 | /* match virus name against pattern (caseless ------->----------v) */ |
2161 | if (malware_name && regex_match_and_setup(re, malware_name, 0, -1)) | |
2162 | { | |
e1d04f48 | 2163 | DEBUG(D_acl) debug_printf_indent( |
0f0c8159 JH |
2164 | "Matched regex to malware [%s] [%s]\n", malware_re, malware_name); |
2165 | return OK; | |
2166 | } | |
2167 | else | |
2168 | return FAIL; | |
8523533c TK |
2169 | } |
2170 | ||
2171 | ||
0f0c8159 JH |
2172 | /************************************************* |
2173 | * Scan an email for malware * | |
2174 | *************************************************/ | |
8523533c | 2175 | |
0f0c8159 JH |
2176 | /* This is the normal interface for scanning an email, which doesn't need a |
2177 | filename; it's a wrapper around the malware_file function. | |
8523533c | 2178 | |
0f0c8159 JH |
2179 | Arguments: |
2180 | malware_re match condition for "malware=" | |
2181 | timeout if nonzero, timeout in seconds | |
2182 | ||
2183 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) | |
2184 | where true means malware was found (condition applies) | |
2185 | */ | |
2186 | int | |
2187 | malware(const uschar * malware_re, int timeout) | |
8523533c | 2188 | { |
040721f2 | 2189 | int ret = malware_internal(malware_re, NULL, timeout); |
8e669ac1 | 2190 | |
55240832 | 2191 | if (ret == DEFER) av_failed = TRUE; |
55240832 | 2192 | return ret; |
8523533c TK |
2193 | } |
2194 | ||
8e669ac1 | 2195 | |
0f0c8159 JH |
2196 | /************************************************* |
2197 | * Scan a file for malware * | |
2198 | *************************************************/ | |
8e669ac1 | 2199 | |
0f0c8159 JH |
2200 | /* This is a test wrapper for scanning an email, which is not used in |
2201 | normal processing. Scan any file, using the Exim scanning interface. | |
2202 | This function tampers with various global variables so is unsafe to use | |
2203 | in any other context. | |
8e669ac1 | 2204 | |
0f0c8159 JH |
2205 | Arguments: |
2206 | eml_filename a file holding the message to be scanned | |
8523533c | 2207 | |
0f0c8159 JH |
2208 | Returns: Exim message processing code (OK, FAIL, DEFER, ...) |
2209 | where true means malware was found (condition applies) | |
2210 | */ | |
2211 | int | |
2212 | malware_in_file(uschar *eml_filename) | |
8523533c | 2213 | { |
55240832 JH |
2214 | uschar message_id_buf[64]; |
2215 | int ret; | |
2216 | ||
2217 | /* spool_mbox() assumes various parameters exist, when creating | |
2218 | the relevant directory and the email within */ | |
2219 | ||
2220 | (void) string_format(message_id_buf, sizeof(message_id_buf), | |
2221 | "dummy-%d", vaguely_random_number(INT_MAX)); | |
2222 | message_id = message_id_buf; | |
2223 | sender_address = US"malware-sender@example.net"; | |
2224 | return_path = US""; | |
2225 | recipients_list = NULL; | |
2226 | receive_add_recipient(US"malware-victim@example.net", -1); | |
8768d548 | 2227 | f.enable_dollar_recipients = TRUE; |
55240832 | 2228 | |
040721f2 | 2229 | ret = malware_internal(US"*", eml_filename, 0); |
55240832 JH |
2230 | |
2231 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); | |
2232 | spool_mbox_ok = 1; | |
2233 | ||
2234 | /* don't set no_mbox_unspool; at present, there's no way for it to become | |
2235 | set, but if that changes, then it should apply to these tests too */ | |
2236 | ||
2237 | unspool_mbox(); | |
2238 | ||
2239 | /* silence static analysis tools */ | |
2240 | message_id = NULL; | |
2241 | ||
2242 | return ret; | |
8523533c TK |
2243 | } |
2244 | ||
476be7e2 JH |
2245 | |
2246 | void | |
2247 | malware_init(void) | |
2248 | { | |
2249 | if (!malware_default_re) | |
2250 | malware_default_re = regex_must_compile(malware_regex_default, FALSE, TRUE); | |
c11d665d JH |
2251 | |
2252 | #ifndef DISABLE_MAL_DRWEB | |
476be7e2 JH |
2253 | if (!drweb_re) |
2254 | drweb_re = regex_must_compile(drweb_re_str, FALSE, TRUE); | |
c11d665d JH |
2255 | #endif |
2256 | #ifndef DISABLE_MAL_FSECURE | |
476be7e2 JH |
2257 | if (!fsec_re) |
2258 | fsec_re = regex_must_compile(fsec_re_str, FALSE, TRUE); | |
c11d665d JH |
2259 | #endif |
2260 | #ifndef DISABLE_MAL_KAV | |
476be7e2 JH |
2261 | if (!kav_re_sus) |
2262 | kav_re_sus = regex_must_compile(kav_re_sus_str, FALSE, TRUE); | |
2263 | if (!kav_re_inf) | |
2264 | kav_re_inf = regex_must_compile(kav_re_inf_str, FALSE, TRUE); | |
c11d665d | 2265 | #endif |
fd5a6ffb | 2266 | #ifndef DISABLE_MAL_AVAST |
476be7e2 JH |
2267 | if (!ava_re_clean) |
2268 | ava_re_clean = regex_must_compile(ava_re_clean_str, FALSE, TRUE); | |
2269 | if (!ava_re_virus) | |
2270 | ava_re_virus = regex_must_compile(ava_re_virus_str, FALSE, TRUE); | |
ad93c40f HSHR |
2271 | if (!ava_re_error) |
2272 | ava_re_error = regex_must_compile(ava_re_error_str, FALSE, TRUE); | |
c11d665d | 2273 | #endif |
fd5a6ffb | 2274 | #ifndef DISABLE_MAL_FFROT6D |
71b32d41 ACK |
2275 | if (!fprot6d_re_error) |
2276 | fprot6d_re_error = regex_must_compile(fprot6d_re_error_str, FALSE, TRUE); | |
2277 | if (!fprot6d_re_virus) | |
2278 | fprot6d_re_virus = regex_must_compile(fprot6d_re_virus_str, FALSE, TRUE); | |
c11d665d JH |
2279 | #endif |
2280 | } | |
2281 | ||
2282 | ||
2283 | void | |
2284 | malware_show_supported(FILE * f) | |
2285 | { | |
c11d665d | 2286 | fprintf(f, "Malware:"); |
d7978c0f | 2287 | for (struct scan * sc = m_scans; sc->scancode != (scanner_t)-1; sc++) fprintf(f, " %s", sc->name); |
c11d665d | 2288 | fprintf(f, "\n"); |
476be7e2 JH |
2289 | } |
2290 | ||
c11d665d JH |
2291 | |
2292 | # endif /*!MACRO_PREDEF*/ | |
b1f8e4f8 JH |
2293 | #endif /*WITH_CONTENT_SCAN*/ |
2294 | /* | |
2295 | * vi: aw ai sw=2 | |
2296 | */ |