Commit | Line | Data |
---|---|---|
80a47a2c TK |
1 | /* |
2 | * PDKIM - a RFC4871 (DKIM) implementation | |
3 | * | |
f444c2c7 | 4 | * Copyright (C) 2009 - 2016 Tom Kistner <tom@duncanthrax.net> |
d4e5e70b | 5 | * Copyright (C) 2016 - 2017 Jeremy Harris <jgh@exim.org> |
80a47a2c TK |
6 | * |
7 | * http://duncanthrax.net/pdkim/ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
0d04a285 | 24 | #include "../exim.h" |
80a47a2c | 25 | |
f444c2c7 JH |
26 | |
27 | #ifndef DISABLE_DKIM /* entire file */ | |
28 | ||
29 | #ifndef SUPPORT_TLS | |
30 | # error Need SUPPORT_TLS for DKIM | |
31 | #endif | |
32 | ||
cb224393 | 33 | #include "crypt_ver.h" |
f444c2c7 | 34 | |
d73e45df | 35 | #ifdef SIGN_OPENSSL |
cb224393 JH |
36 | # include <openssl/rsa.h> |
37 | # include <openssl/ssl.h> | |
38 | # include <openssl/err.h> | |
d73e45df | 39 | #elif defined(SIGN_GNUTLS) |
f444c2c7 JH |
40 | # include <gnutls/gnutls.h> |
41 | # include <gnutls/x509.h> | |
f444c2c7 JH |
42 | #endif |
43 | ||
44 | #include "pdkim.h" | |
9b2583c4 | 45 | #include "signing.h" |
80a47a2c TK |
46 | |
47 | #define PDKIM_SIGNATURE_VERSION "1" | |
e2e3255a | 48 | #define PDKIM_PUB_RECORD_VERSION US "DKIM1" |
80a47a2c TK |
49 | |
50 | #define PDKIM_MAX_HEADER_LEN 65536 | |
51 | #define PDKIM_MAX_HEADERS 512 | |
52 | #define PDKIM_MAX_BODY_LINE_LEN 16384 | |
53 | #define PDKIM_DNS_TXT_MAX_NAMELEN 1024 | |
80a47a2c TK |
54 | |
55 | /* -------------------------------------------------------------------------- */ | |
56 | struct pdkim_stringlist { | |
e2e3255a JH |
57 | uschar * value; |
58 | int tag; | |
59 | void * next; | |
80a47a2c TK |
60 | }; |
61 | ||
80a47a2c TK |
62 | /* -------------------------------------------------------------------------- */ |
63 | /* A bunch of list constants */ | |
e2e3255a JH |
64 | const uschar * pdkim_querymethods[] = { |
65 | US"dns/txt", | |
80a47a2c TK |
66 | NULL |
67 | }; | |
e2e3255a JH |
68 | const uschar * pdkim_canons[] = { |
69 | US"simple", | |
70 | US"relaxed", | |
80a47a2c TK |
71 | NULL |
72 | }; | |
d73e45df JH |
73 | |
74 | typedef struct { | |
75 | const uschar * dkim_hashname; | |
76 | hashmethod exim_hashmethod; | |
77 | } pdkim_hashtype; | |
78 | static const pdkim_hashtype pdkim_hashes[] = { | |
79 | { US"sha1", HASH_SHA1 }, | |
80 | { US"sha256", HASH_SHA2_256 }, | |
81 | { US"sha512", HASH_SHA2_512 } | |
80a47a2c | 82 | }; |
d73e45df | 83 | |
e2e3255a | 84 | const uschar * pdkim_keytypes[] = { |
d73e45df | 85 | US"rsa" |
80a47a2c TK |
86 | }; |
87 | ||
88 | typedef struct pdkim_combined_canon_entry { | |
e2e3255a | 89 | const uschar * str; |
80a47a2c TK |
90 | int canon_headers; |
91 | int canon_body; | |
92 | } pdkim_combined_canon_entry; | |
f444c2c7 | 93 | |
80a47a2c | 94 | pdkim_combined_canon_entry pdkim_combined_canons[] = { |
e2e3255a JH |
95 | { US"simple/simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, |
96 | { US"simple/relaxed", PDKIM_CANON_SIMPLE, PDKIM_CANON_RELAXED }, | |
97 | { US"relaxed/simple", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, | |
98 | { US"relaxed/relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_RELAXED }, | |
99 | { US"simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, | |
100 | { US"relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, | |
101 | { NULL, 0, 0 } | |
80a47a2c TK |
102 | }; |
103 | ||
104 | ||
9e70917d JH |
105 | static blob lineending = {.data = US"\r\n", .len = 2}; |
106 | ||
f444c2c7 | 107 | /* -------------------------------------------------------------------------- */ |
d73e45df | 108 | uschar * |
9e70917d | 109 | dkim_sig_to_a_tag(const pdkim_signature * sig) |
d73e45df JH |
110 | { |
111 | if ( sig->keytype < 0 || sig->keytype > nelem(pdkim_keytypes) | |
112 | || sig->hashtype < 0 || sig->hashtype > nelem(pdkim_hashes)) | |
113 | return US"err"; | |
114 | return string_sprintf("%s-%s", | |
115 | pdkim_keytypes[sig->keytype], pdkim_hashes[sig->hashtype].dkim_hashname); | |
116 | } | |
117 | ||
118 | ||
f444c2c7 JH |
119 | |
120 | const char * | |
121 | pdkim_verify_status_str(int status) | |
122 | { | |
f7302073 JH |
123 | switch(status) |
124 | { | |
125 | case PDKIM_VERIFY_NONE: return "PDKIM_VERIFY_NONE"; | |
126 | case PDKIM_VERIFY_INVALID: return "PDKIM_VERIFY_INVALID"; | |
127 | case PDKIM_VERIFY_FAIL: return "PDKIM_VERIFY_FAIL"; | |
128 | case PDKIM_VERIFY_PASS: return "PDKIM_VERIFY_PASS"; | |
129 | default: return "PDKIM_VERIFY_UNKNOWN"; | |
ff7ddfd7 TK |
130 | } |
131 | } | |
f444c2c7 JH |
132 | |
133 | const char * | |
134 | pdkim_verify_ext_status_str(int ext_status) | |
135 | { | |
f7302073 JH |
136 | switch(ext_status) |
137 | { | |
138 | case PDKIM_VERIFY_FAIL_BODY: return "PDKIM_VERIFY_FAIL_BODY"; | |
139 | case PDKIM_VERIFY_FAIL_MESSAGE: return "PDKIM_VERIFY_FAIL_MESSAGE"; | |
135e9496 | 140 | case PDKIM_VERIFY_FAIL_SIG_ALGO_MISMATCH: return "PDKIM_VERIFY_FAIL_SIG_ALGO_MISMATCH"; |
f7302073 JH |
141 | case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE"; |
142 | case PDKIM_VERIFY_INVALID_BUFFER_SIZE: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE"; | |
143 | case PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD: return "PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD"; | |
144 | case PDKIM_VERIFY_INVALID_PUBKEY_IMPORT: return "PDKIM_VERIFY_INVALID_PUBKEY_IMPORT"; | |
145 | case PDKIM_VERIFY_INVALID_SIGNATURE_ERROR: return "PDKIM_VERIFY_INVALID_SIGNATURE_ERROR"; | |
146 | case PDKIM_VERIFY_INVALID_DKIM_VERSION: return "PDKIM_VERIFY_INVALID_DKIM_VERSION"; | |
147 | default: return "PDKIM_VERIFY_UNKNOWN"; | |
148 | } | |
149 | } | |
150 | ||
b9df1829 | 151 | const uschar * |
f7302073 JH |
152 | pdkim_errstr(int status) |
153 | { | |
154 | switch(status) | |
155 | { | |
b9df1829 JH |
156 | case PDKIM_OK: return US"OK"; |
157 | case PDKIM_FAIL: return US"FAIL"; | |
158 | case PDKIM_ERR_RSA_PRIVKEY: return US"RSA_PRIVKEY"; | |
159 | case PDKIM_ERR_RSA_SIGNING: return US"RSA SIGNING"; | |
160 | case PDKIM_ERR_LONG_LINE: return US"RSA_LONG_LINE"; | |
161 | case PDKIM_ERR_BUFFER_TOO_SMALL: return US"BUFFER_TOO_SMALL"; | |
162 | case PDKIM_SIGN_PRIVKEY_WRAP: return US"PRIVKEY_WRAP"; | |
163 | case PDKIM_SIGN_PRIVKEY_B64D: return US"PRIVKEY_B64D"; | |
ef698bf6 | 164 | default: return US"(unknown)"; |
ff7ddfd7 TK |
165 | } |
166 | } | |
167 | ||
168 | ||
80a47a2c TK |
169 | /* -------------------------------------------------------------------------- */ |
170 | /* Print debugging functions */ | |
2592e6c0 | 171 | static void |
b78006ac | 172 | pdkim_quoteprint(const uschar *data, int len) |
3045f050 JH |
173 | { |
174 | int i; | |
0d04a285 | 175 | for (i = 0; i < len; i++) |
3045f050 | 176 | { |
b78006ac | 177 | const int c = data[i]; |
3045f050 JH |
178 | switch (c) |
179 | { | |
0d04a285 JH |
180 | case ' ' : debug_printf("{SP}"); break; |
181 | case '\t': debug_printf("{TB}"); break; | |
182 | case '\r': debug_printf("{CR}"); break; | |
183 | case '\n': debug_printf("{LF}"); break; | |
184 | case '{' : debug_printf("{BO}"); break; | |
185 | case '}' : debug_printf("{BC}"); break; | |
3045f050 JH |
186 | default: |
187 | if ( (c < 32) || (c > 127) ) | |
0d04a285 | 188 | debug_printf("{%02x}", c); |
3045f050 | 189 | else |
0d04a285 | 190 | debug_printf("%c", c); |
80a47a2c TK |
191 | break; |
192 | } | |
193 | } | |
2592e6c0 | 194 | debug_printf("\n"); |
80a47a2c | 195 | } |
80a47a2c | 196 | |
2592e6c0 | 197 | static void |
b78006ac | 198 | pdkim_hexprint(const uschar *data, int len) |
3045f050 JH |
199 | { |
200 | int i; | |
02c4f8fb JH |
201 | if (data) for (i = 0 ; i < len; i++) debug_printf("%02x", data[i]); |
202 | else debug_printf("<NULL>"); | |
2592e6c0 | 203 | debug_printf("\n"); |
80a47a2c | 204 | } |
80a47a2c TK |
205 | |
206 | ||
f444c2c7 | 207 | |
f444c2c7 | 208 | static pdkim_stringlist * |
ca9cb170 | 209 | pdkim_prepend_stringlist(pdkim_stringlist * base, const uschar * str) |
3045f050 | 210 | { |
ca9cb170 | 211 | pdkim_stringlist * new_entry = store_get(sizeof(pdkim_stringlist)); |
3045f050 | 212 | |
abe1010c | 213 | memset(new_entry, 0, sizeof(pdkim_stringlist)); |
ca9cb170 | 214 | new_entry->value = string_copy(str); |
ab9152ff JH |
215 | if (base) new_entry->next = base; |
216 | return new_entry; | |
6ab02e3f | 217 | } |
80a47a2c TK |
218 | |
219 | ||
8ef02a06 JH |
220 | |
221 | /* Trim whitespace fore & aft */ | |
222 | ||
ca9cb170 | 223 | static void |
acec9514 | 224 | pdkim_strtrim(gstring * str) |
3045f050 | 225 | { |
acec9514 | 226 | uschar * p = str->s; |
b2bcdd35 | 227 | uschar * q; |
acec9514 JH |
228 | |
229 | while (*p == '\t' || *p == ' ') /* dump the leading whitespace */ | |
230 | { str->size--; str->ptr--; str->s++; } | |
231 | ||
232 | while ( str->ptr > 0 | |
81147e20 | 233 | && ((q = str->s + str->ptr - 1), (*q == '\t' || *q == ' ')) |
acec9514 JH |
234 | ) |
235 | str->ptr--; /* dump trailing whitespace */ | |
236 | ||
237 | (void) string_from_gstring(str); | |
8ef02a06 JH |
238 | } |
239 | ||
240 | ||
80a47a2c | 241 | |
80a47a2c | 242 | /* -------------------------------------------------------------------------- */ |
3045f050 JH |
243 | |
244 | DLLEXPORT void | |
245 | pdkim_free_ctx(pdkim_ctx *ctx) | |
246 | { | |
6ab02e3f | 247 | } |
80a47a2c TK |
248 | |
249 | ||
250 | /* -------------------------------------------------------------------------- */ | |
251 | /* Matches the name of the passed raw "header" against | |
8ef02a06 | 252 | the passed colon-separated "tick", and invalidates |
484cc1a9 JH |
253 | the entry in tick. Entries can be prefixed for multi- or over-signing, |
254 | in which case do not invalidate. | |
255 | ||
256 | Returns OK for a match, or fail-code | |
257 | */ | |
3045f050 | 258 | |
f444c2c7 | 259 | static int |
e2e3255a | 260 | header_name_match(const uschar * header, uschar * tick) |
3045f050 | 261 | { |
484cc1a9 JH |
262 | const uschar * ticklist = tick; |
263 | int sep = ':'; | |
264 | BOOL multisign; | |
265 | uschar * hname, * p, * ele; | |
ca9cb170 | 266 | uschar * hcolon = Ustrchr(header, ':'); /* Get header name */ |
3045f050 | 267 | |
ca9cb170 JH |
268 | if (!hcolon) |
269 | return PDKIM_FAIL; /* This isn't a header */ | |
3045f050 | 270 | |
ca9cb170 JH |
271 | /* if we had strncmpic() we wouldn't need this copy */ |
272 | hname = string_copyn(header, hcolon-header); | |
3045f050 | 273 | |
484cc1a9 | 274 | while (p = US ticklist, ele = string_nextinlist(&ticklist, &sep, NULL, 0)) |
3045f050 | 275 | { |
484cc1a9 JH |
276 | switch (*ele) |
277 | { | |
278 | case '=': case '+': multisign = TRUE; ele++; break; | |
279 | default: multisign = FALSE; break; | |
80a47a2c TK |
280 | } |
281 | ||
484cc1a9 JH |
282 | if (strcmpic(ele, hname) == 0) |
283 | { | |
284 | if (!multisign) | |
285 | *p = '_'; /* Invalidate this header name instance in tick-off list */ | |
286 | return PDKIM_OK; | |
287 | } | |
288 | } | |
ca9cb170 | 289 | return PDKIM_FAIL; |
80a47a2c TK |
290 | } |
291 | ||
292 | ||
293 | /* -------------------------------------------------------------------------- */ | |
ca9cb170 | 294 | /* Performs "relaxed" canonicalization of a header. */ |
3045f050 | 295 | |
ca9cb170 | 296 | static uschar * |
ea18931d | 297 | pdkim_relax_header(const uschar * header, BOOL append_crlf) |
3045f050 JH |
298 | { |
299 | BOOL past_field_name = FALSE; | |
300 | BOOL seen_wsp = FALSE; | |
ca9cb170 JH |
301 | const uschar * p; |
302 | uschar * relaxed = store_get(Ustrlen(header)+3); | |
303 | uschar * q = relaxed; | |
3045f050 | 304 | |
ca9cb170 | 305 | for (p = header; *p; p++) |
3045f050 | 306 | { |
ca9cb170 | 307 | uschar c = *p; |
ea18931d JH |
308 | |
309 | if (c == '\r' || c == '\n') /* Ignore CR & LF */ | |
3045f050 JH |
310 | continue; |
311 | if (c == '\t' || c == ' ') | |
312 | { | |
313 | if (seen_wsp) | |
80a47a2c | 314 | continue; |
3045f050 JH |
315 | c = ' '; /* Turns WSP into SP */ |
316 | seen_wsp = TRUE; | |
80a47a2c | 317 | } |
3045f050 JH |
318 | else |
319 | if (!past_field_name && c == ':') | |
320 | { | |
ea18931d JH |
321 | if (seen_wsp) q--; /* This removes WSP immediately before the colon */ |
322 | seen_wsp = TRUE; /* This removes WSP immediately after the colon */ | |
3045f050 | 323 | past_field_name = TRUE; |
80a47a2c | 324 | } |
3045f050 JH |
325 | else |
326 | seen_wsp = FALSE; | |
327 | ||
328 | /* Lowercase header name */ | |
329 | if (!past_field_name) c = tolower(c); | |
330 | *q++ = c; | |
80a47a2c | 331 | } |
3045f050 JH |
332 | |
333 | if (q > relaxed && q[-1] == ' ') q--; /* Squash eventual trailing SP */ | |
3045f050 | 334 | |
ea18931d | 335 | if (append_crlf) { *q++ = '\r'; *q++ = '\n'; } |
ca9cb170 | 336 | *q = '\0'; |
3045f050 | 337 | return relaxed; |
6ab02e3f | 338 | } |
80a47a2c TK |
339 | |
340 | ||
341 | /* -------------------------------------------------------------------------- */ | |
342 | #define PDKIM_QP_ERROR_DECODE -1 | |
3045f050 | 343 | |
35cf75e9 JH |
344 | static const uschar * |
345 | pdkim_decode_qp_char(const uschar *qp_p, int *c) | |
3045f050 | 346 | { |
35cf75e9 | 347 | const uschar *initial_pos = qp_p; |
3045f050 JH |
348 | |
349 | /* Advance one char */ | |
350 | qp_p++; | |
351 | ||
352 | /* Check for two hex digits and decode them */ | |
353 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) | |
354 | { | |
355 | /* Do hex conversion */ | |
356 | *c = (isdigit(*qp_p) ? *qp_p - '0' : toupper(*qp_p) - 'A' + 10) << 4; | |
a5840e10 | 357 | *c |= isdigit(qp_p[1]) ? qp_p[1] - '0' : toupper(qp_p[1]) - 'A' + 10; |
3045f050 | 358 | return qp_p + 2; |
6ab02e3f | 359 | } |
80a47a2c | 360 | |
3045f050 JH |
361 | /* Illegal char here */ |
362 | *c = PDKIM_QP_ERROR_DECODE; | |
363 | return initial_pos; | |
80a47a2c TK |
364 | } |
365 | ||
366 | ||
367 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 368 | |
e2e3255a | 369 | static uschar * |
35cf75e9 | 370 | pdkim_decode_qp(const uschar * str) |
3045f050 JH |
371 | { |
372 | int nchar = 0; | |
ca9cb170 | 373 | uschar * q; |
35cf75e9 | 374 | const uschar * p = str; |
ca9cb170 | 375 | uschar * n = store_get(Ustrlen(str)+1); |
3045f050 JH |
376 | |
377 | *n = '\0'; | |
378 | q = n; | |
ca9cb170 | 379 | while (*p) |
3045f050 JH |
380 | { |
381 | if (*p == '=') | |
382 | { | |
383 | p = pdkim_decode_qp_char(p, &nchar); | |
384 | if (nchar >= 0) | |
385 | { | |
386 | *q++ = nchar; | |
387 | continue; | |
80a47a2c TK |
388 | } |
389 | } | |
3045f050 JH |
390 | else |
391 | *q++ = *p; | |
392 | p++; | |
80a47a2c | 393 | } |
3045f050 JH |
394 | *q = '\0'; |
395 | return n; | |
80a47a2c TK |
396 | } |
397 | ||
398 | ||
399 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 400 | |
2592e6c0 | 401 | static void |
35cf75e9 | 402 | pdkim_decode_base64(const uschar * str, blob * b) |
3045f050 | 403 | { |
2592e6c0 | 404 | int dlen; |
2592e6c0 JH |
405 | dlen = b64decode(str, &b->data); |
406 | if (dlen < 0) b->data = NULL; | |
407 | b->len = dlen; | |
80a47a2c TK |
408 | } |
409 | ||
ca9cb170 | 410 | static uschar * |
2592e6c0 | 411 | pdkim_encode_base64(blob * b) |
3045f050 | 412 | { |
ca9cb170 | 413 | return b64encode(b->data, b->len); |
80a47a2c TK |
414 | } |
415 | ||
416 | ||
417 | /* -------------------------------------------------------------------------- */ | |
418 | #define PDKIM_HDR_LIMBO 0 | |
419 | #define PDKIM_HDR_TAG 1 | |
420 | #define PDKIM_HDR_VALUE 2 | |
3045f050 | 421 | |
f444c2c7 | 422 | static pdkim_signature * |
9e70917d | 423 | pdkim_parse_sig_header(pdkim_ctx * ctx, uschar * raw_hdr) |
3045f050 | 424 | { |
2c0f3ea1 | 425 | pdkim_signature * sig; |
ca9cb170 | 426 | uschar *p, *q; |
acec9514 JH |
427 | gstring * cur_tag = NULL; |
428 | gstring * cur_val = NULL; | |
3045f050 JH |
429 | BOOL past_hname = FALSE; |
430 | BOOL in_b_val = FALSE; | |
431 | int where = PDKIM_HDR_LIMBO; | |
432 | int i; | |
433 | ||
ca9cb170 | 434 | sig = store_get(sizeof(pdkim_signature)); |
abe1010c | 435 | memset(sig, 0, sizeof(pdkim_signature)); |
3045f050 JH |
436 | sig->bodylength = -1; |
437 | ||
07eeb4df | 438 | /* Set so invalid/missing data error display is accurate */ |
07eeb4df | 439 | sig->version = 0; |
d73e45df JH |
440 | sig->keytype = -1; |
441 | sig->hashtype = -1; | |
07eeb4df | 442 | |
ca9cb170 | 443 | q = sig->rawsig_no_b_val = store_get(Ustrlen(raw_hdr)+1); |
80a47a2c | 444 | |
3045f050 JH |
445 | for (p = raw_hdr; ; p++) |
446 | { | |
447 | char c = *p; | |
80a47a2c | 448 | |
3045f050 JH |
449 | /* Ignore FWS */ |
450 | if (c == '\r' || c == '\n') | |
451 | goto NEXT_CHAR; | |
80a47a2c | 452 | |
3045f050 JH |
453 | /* Fast-forward through header name */ |
454 | if (!past_hname) | |
455 | { | |
456 | if (c == ':') past_hname = TRUE; | |
457 | goto NEXT_CHAR; | |
80a47a2c TK |
458 | } |
459 | ||
3045f050 JH |
460 | if (where == PDKIM_HDR_LIMBO) |
461 | { | |
462 | /* In limbo, just wait for a tag-char to appear */ | |
463 | if (!(c >= 'a' && c <= 'z')) | |
464 | goto NEXT_CHAR; | |
80a47a2c | 465 | |
3045f050 | 466 | where = PDKIM_HDR_TAG; |
80a47a2c TK |
467 | } |
468 | ||
3045f050 JH |
469 | if (where == PDKIM_HDR_TAG) |
470 | { | |
3045f050 | 471 | if (c >= 'a' && c <= 'z') |
acec9514 | 472 | cur_tag = string_catn(cur_tag, p, 1); |
80a47a2c | 473 | |
3045f050 JH |
474 | if (c == '=') |
475 | { | |
acec9514 | 476 | if (Ustrcmp(string_from_gstring(cur_tag), "b") == 0) |
3045f050 | 477 | { |
ca9cb170 | 478 | *q++ = '='; |
3045f050 JH |
479 | in_b_val = TRUE; |
480 | } | |
481 | where = PDKIM_HDR_VALUE; | |
482 | goto NEXT_CHAR; | |
80a47a2c TK |
483 | } |
484 | } | |
485 | ||
3045f050 JH |
486 | if (where == PDKIM_HDR_VALUE) |
487 | { | |
3045f050 JH |
488 | if (c == '\r' || c == '\n' || c == ' ' || c == '\t') |
489 | goto NEXT_CHAR; | |
490 | ||
491 | if (c == ';' || c == '\0') | |
492 | { | |
a05d3e34 JH |
493 | /* We must have both tag and value, and tags must be one char except |
494 | for the possibility of "bh". */ | |
495 | ||
496 | if ( cur_tag && cur_val | |
497 | && (cur_tag->ptr == 1 || *cur_tag->s == 'b') | |
498 | ) | |
3045f050 | 499 | { |
acec9514 | 500 | (void) string_from_gstring(cur_val); |
3045f050 JH |
501 | pdkim_strtrim(cur_val); |
502 | ||
acec9514 | 503 | DEBUG(D_acl) debug_printf(" %s=%s\n", cur_tag->s, cur_val->s); |
3045f050 | 504 | |
acec9514 | 505 | switch (*cur_tag->s) |
3045f050 JH |
506 | { |
507 | case 'b': | |
a05d3e34 JH |
508 | switch (cur_tag->s[1]) |
509 | { | |
510 | case '\0': pdkim_decode_base64(cur_val->s, &sig->sighash); break; | |
511 | case 'h': if (cur_tag->ptr == 2) | |
512 | pdkim_decode_base64(cur_val->s, &sig->bodyhash); | |
513 | break; | |
514 | default: break; | |
515 | } | |
3045f050 JH |
516 | break; |
517 | case 'v': | |
518 | /* We only support version 1, and that is currently the | |
519 | only version there is. */ | |
07eeb4df | 520 | sig->version = |
acec9514 | 521 | Ustrcmp(cur_val->s, PDKIM_SIGNATURE_VERSION) == 0 ? 1 : -1; |
3045f050 JH |
522 | break; |
523 | case 'a': | |
d73e45df | 524 | { |
acec9514 | 525 | uschar * s = Ustrchr(cur_val->s, '-'); |
d73e45df JH |
526 | |
527 | for(i = 0; i < nelem(pdkim_keytypes); i++) | |
acec9514 | 528 | if (Ustrncmp(cur_val->s, pdkim_keytypes[i], s - cur_val->s) == 0) |
d73e45df JH |
529 | { sig->keytype = i; break; } |
530 | for (++s, i = 0; i < nelem(pdkim_hashes); i++) | |
531 | if (Ustrcmp(s, pdkim_hashes[i].dkim_hashname) == 0) | |
532 | { sig->hashtype = i; break; } | |
3045f050 | 533 | break; |
d73e45df JH |
534 | } |
535 | ||
3045f050 JH |
536 | case 'c': |
537 | for (i = 0; pdkim_combined_canons[i].str; i++) | |
acec9514 | 538 | if (Ustrcmp(cur_val->s, pdkim_combined_canons[i].str) == 0) |
3045f050 JH |
539 | { |
540 | sig->canon_headers = pdkim_combined_canons[i].canon_headers; | |
541 | sig->canon_body = pdkim_combined_canons[i].canon_body; | |
542 | break; | |
543 | } | |
544 | break; | |
545 | case 'q': | |
546 | for (i = 0; pdkim_querymethods[i]; i++) | |
acec9514 | 547 | if (Ustrcmp(cur_val->s, pdkim_querymethods[i]) == 0) |
3045f050 JH |
548 | { |
549 | sig->querymethod = i; | |
550 | break; | |
551 | } | |
552 | break; | |
553 | case 's': | |
acec9514 | 554 | sig->selector = string_copyn(cur_val->s, cur_val->ptr); break; |
3045f050 | 555 | case 'd': |
acec9514 | 556 | sig->domain = string_copyn(cur_val->s, cur_val->ptr); break; |
3045f050 | 557 | case 'i': |
acec9514 | 558 | sig->identity = pdkim_decode_qp(cur_val->s); break; |
3045f050 | 559 | case 't': |
acec9514 | 560 | sig->created = strtoul(CS cur_val->s, NULL, 10); break; |
3045f050 | 561 | case 'x': |
acec9514 | 562 | sig->expires = strtoul(CS cur_val->s, NULL, 10); break; |
3045f050 | 563 | case 'l': |
acec9514 | 564 | sig->bodylength = strtol(CS cur_val->s, NULL, 10); break; |
3045f050 | 565 | case 'h': |
acec9514 | 566 | sig->headernames = string_copyn(cur_val->s, cur_val->ptr); break; |
3045f050 | 567 | case 'z': |
acec9514 | 568 | sig->copiedheaders = pdkim_decode_qp(cur_val->s); break; |
3045f050 | 569 | default: |
0d04a285 | 570 | DEBUG(D_acl) debug_printf(" Unknown tag encountered\n"); |
3045f050 JH |
571 | break; |
572 | } | |
573 | } | |
acec9514 | 574 | cur_tag = cur_val = NULL; |
3045f050 JH |
575 | in_b_val = FALSE; |
576 | where = PDKIM_HDR_LIMBO; | |
80a47a2c | 577 | } |
3045f050 | 578 | else |
acec9514 | 579 | cur_val = string_catn(cur_val, p, 1); |
80a47a2c TK |
580 | } |
581 | ||
3045f050 JH |
582 | NEXT_CHAR: |
583 | if (c == '\0') | |
584 | break; | |
80a47a2c | 585 | |
3045f050 JH |
586 | if (!in_b_val) |
587 | *q++ = c; | |
80a47a2c TK |
588 | } |
589 | ||
3045f050 JH |
590 | *q = '\0'; |
591 | /* Chomp raw header. The final newline must not be added to the signature. */ | |
37f3dc43 JH |
592 | while (--q > sig->rawsig_no_b_val && (*q == '\r' || *q == '\n')) |
593 | *q = '\0'; | |
80a47a2c | 594 | |
0d04a285 | 595 | DEBUG(D_acl) |
3045f050 | 596 | { |
0d04a285 | 597 | debug_printf( |
3045f050 | 598 | "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); |
e2e3255a | 599 | pdkim_quoteprint(US sig->rawsig_no_b_val, Ustrlen(sig->rawsig_no_b_val)); |
0d04a285 | 600 | debug_printf( |
dcd03763 | 601 | "PDKIM >> Sig size: %4u bits\n", (unsigned) sig->sighash.len*8); |
0d04a285 | 602 | debug_printf( |
3045f050 | 603 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 604 | } |
80a47a2c | 605 | |
9b2583c4 | 606 | /*XXX hash method: extend for sha512 */ |
7b83389d | 607 | if (!exim_sha_init(&sig->body_hash_ctx, |
d73e45df | 608 | pdkim_hashes[sig->hashtype].exim_hashmethod)) |
7b83389d | 609 | { |
d73e45df JH |
610 | DEBUG(D_acl) |
611 | debug_printf("PDKIM: hash init error, possibly nonhandled hashtype\n"); | |
7b83389d JH |
612 | return NULL; |
613 | } | |
3045f050 | 614 | return sig; |
80a47a2c TK |
615 | } |
616 | ||
617 | ||
618 | /* -------------------------------------------------------------------------- */ | |
80a47a2c | 619 | |
f444c2c7 | 620 | static pdkim_pubkey * |
e2e3255a | 621 | pdkim_parse_pubkey_record(pdkim_ctx *ctx, const uschar *raw_record) |
3045f050 | 622 | { |
35cf75e9 JH |
623 | const uschar * ele; |
624 | int sep = ';'; | |
625 | pdkim_pubkey * pub; | |
80a47a2c | 626 | |
ca9cb170 | 627 | pub = store_get(sizeof(pdkim_pubkey)); |
abe1010c | 628 | memset(pub, 0, sizeof(pdkim_pubkey)); |
80a47a2c | 629 | |
35cf75e9 JH |
630 | while ((ele = string_nextinlist(&raw_record, &sep, NULL, 0))) |
631 | { | |
632 | const uschar * val; | |
633 | ||
634 | if ((val = Ustrchr(ele, '='))) | |
3045f050 | 635 | { |
35cf75e9 | 636 | int taglen = val++ - ele; |
80a47a2c | 637 | |
35cf75e9 JH |
638 | DEBUG(D_acl) debug_printf(" %.*s=%s\n", taglen, ele, val); |
639 | switch (ele[0]) | |
3045f050 | 640 | { |
35cf75e9 JH |
641 | case 'v': pub->version = val; break; |
642 | case 'h': pub->hashes = val; break; | |
643 | case 'k': break; | |
644 | case 'g': pub->granularity = val; break; | |
645 | case 'n': pub->notes = pdkim_decode_qp(val); break; | |
646 | case 'p': pdkim_decode_base64(val, &pub->key); break; | |
647 | case 's': pub->srvtype = val; break; | |
648 | case 't': if (Ustrchr(val, 'y')) pub->testing = 1; | |
649 | if (Ustrchr(val, 's')) pub->no_subdomaining = 1; | |
e21a4d00 | 650 | break; |
35cf75e9 | 651 | default: DEBUG(D_acl) debug_printf(" Unknown tag encountered\n"); break; |
80a47a2c | 652 | } |
e21a4d00 | 653 | } |
35cf75e9 | 654 | } |
80a47a2c | 655 | |
3045f050 | 656 | /* Set fallback defaults */ |
fc6fb551 JH |
657 | if (!pub->version) |
658 | pub->version = string_copy(PDKIM_PUB_RECORD_VERSION); | |
135e9496 JH |
659 | else if (Ustrcmp(pub->version, PDKIM_PUB_RECORD_VERSION) != 0) |
660 | { | |
661 | DEBUG(D_acl) debug_printf(" Bad v= field\n"); | |
662 | return NULL; | |
663 | } | |
e21a4d00 | 664 | |
35cf75e9 | 665 | if (!pub->granularity) pub->granularity = US"*"; |
e21a4d00 | 666 | /* |
35cf75e9 | 667 | if (!pub->keytype ) pub->keytype = US"rsa"; |
e21a4d00 | 668 | */ |
35cf75e9 | 669 | if (!pub->srvtype ) pub->srvtype = US"*"; |
80a47a2c | 670 | |
3045f050 | 671 | /* p= is required */ |
2592e6c0 | 672 | if (pub->key.data) |
80a47a2c | 673 | return pub; |
3045f050 | 674 | |
135e9496 | 675 | DEBUG(D_acl) debug_printf(" Missing p= field\n"); |
3045f050 | 676 | return NULL; |
80a47a2c TK |
677 | } |
678 | ||
679 | ||
680 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 681 | |
9e70917d JH |
682 | /* Update the bodyhash for one sig, with some additional data. |
683 | If we have to relax the data for this sig, return our copy of it. */ | |
684 | ||
685 | /*XXX Currently we calculate a hash for each sig. But it is possible | |
686 | that multi-signing will be wanted using different signing algos | |
687 | (rsa, ec) using the same hash and canonicalization. Consider in future | |
688 | hanging the hash+cacnon from the ctx and only referencing from the sig, | |
689 | so that it can be calculated only once - being over the body this | |
690 | caould be meagbytes, hence expensive. */ | |
691 | ||
692 | static blob * | |
693 | pdkim_update_sig_bodyhash(pdkim_signature * sig, blob * orig_data, blob * relaxed_data) | |
3045f050 | 694 | { |
9e70917d JH |
695 | blob * canon_data = orig_data; |
696 | /* Defaults to simple canon (no further treatment necessary) */ | |
3045f050 | 697 | |
9e70917d | 698 | if (sig->canon_body == PDKIM_CANON_RELAXED) |
3045f050 | 699 | { |
9e70917d JH |
700 | /* Relax the line if not done already */ |
701 | if (!relaxed_data) | |
3045f050 | 702 | { |
9e70917d | 703 | BOOL seen_wsp = FALSE; |
7845dbb3 | 704 | const uschar * p; |
9e70917d | 705 | int q = 0; |
3045f050 | 706 | |
9e70917d JH |
707 | /* We want to be able to free this else we allocate |
708 | for the entire message which could be many MB. Since | |
709 | we don't know what allocations the SHA routines might | |
710 | do, not safe to use store_get()/store_reset(). */ | |
d5bccfc8 | 711 | |
9e70917d JH |
712 | relaxed_data = store_malloc(sizeof(blob) + orig_data->len+1); |
713 | relaxed_data->data = US (relaxed_data+1); | |
3045f050 | 714 | |
9e70917d JH |
715 | for (p = orig_data->data; *p; p++) |
716 | { | |
717 | char c = *p; | |
718 | if (c == '\r') | |
719 | { | |
720 | if (q > 0 && relaxed_data->data[q-1] == ' ') | |
721 | q--; | |
722 | } | |
723 | else if (c == '\t' || c == ' ') | |
724 | { | |
725 | c = ' '; /* Turns WSP into SP */ | |
726 | if (seen_wsp) | |
727 | continue; | |
728 | seen_wsp = TRUE; | |
3045f050 | 729 | } |
9e70917d JH |
730 | else |
731 | seen_wsp = FALSE; | |
732 | relaxed_data->data[q++] = c; | |
80a47a2c | 733 | } |
9e70917d JH |
734 | relaxed_data->data[q] = '\0'; |
735 | relaxed_data->len = q; | |
80a47a2c | 736 | } |
9e70917d JH |
737 | canon_data = relaxed_data; |
738 | } | |
80a47a2c | 739 | |
9e70917d JH |
740 | /* Make sure we don't exceed the to-be-signed body length */ |
741 | if ( sig->bodylength >= 0 | |
742 | && sig->signed_body_bytes + (unsigned long)canon_data->len > sig->bodylength | |
743 | ) | |
744 | canon_data->len = sig->bodylength - sig->signed_body_bytes; | |
80a47a2c | 745 | |
9e70917d JH |
746 | if (canon_data->len > 0) |
747 | { | |
748 | exim_sha_update(&sig->body_hash_ctx, CUS canon_data->data, canon_data->len); | |
749 | sig->signed_body_bytes += canon_data->len; | |
750 | DEBUG(D_acl) pdkim_quoteprint(canon_data->data, canon_data->len); | |
80a47a2c TK |
751 | } |
752 | ||
9e70917d | 753 | return relaxed_data; |
6ab02e3f | 754 | } |
80a47a2c TK |
755 | |
756 | ||
757 | /* -------------------------------------------------------------------------- */ | |
80a47a2c | 758 | |
ca9cb170 | 759 | static void |
9e70917d | 760 | pdkim_finish_bodyhash(pdkim_ctx * ctx) |
3045f050 | 761 | { |
9e70917d | 762 | pdkim_signature * sig; |
80a47a2c | 763 | |
3045f050 | 764 | /* Traverse all signatures */ |
f4d091fb | 765 | for (sig = ctx->sig; sig; sig = sig->next) |
3045f050 | 766 | { /* Finish hashes */ |
2592e6c0 JH |
767 | blob bh; |
768 | ||
dcd03763 | 769 | exim_sha_finish(&sig->body_hash_ctx, &bh); |
3045f050 | 770 | |
0d04a285 | 771 | DEBUG(D_acl) |
3045f050 | 772 | { |
0d04a285 | 773 | debug_printf("PDKIM [%s] Body bytes hashed: %lu\n" |
9e70917d JH |
774 | "PDKIM [%s] Body %s computed: ", |
775 | sig->domain, sig->signed_body_bytes, | |
776 | sig->domain, pdkim_hashes[sig->hashtype].dkim_hashname); | |
b78006ac | 777 | pdkim_hexprint(CUS bh.data, bh.len); |
80a47a2c | 778 | } |
3045f050 JH |
779 | |
780 | /* SIGNING -------------------------------------------------------------- */ | |
e983e85a | 781 | if (ctx->flags & PDKIM_MODE_SIGN) |
3045f050 | 782 | { |
2592e6c0 | 783 | sig->bodyhash = bh; |
3045f050 JH |
784 | |
785 | /* If bodylength limit is set, and we have received less bytes | |
786 | than the requested amount, effectively remove the limit tag. */ | |
787 | if (sig->signed_body_bytes < sig->bodylength) | |
788 | sig->bodylength = -1; | |
80a47a2c | 789 | } |
3045f050 | 790 | |
3045f050 | 791 | else |
02c4f8fb JH |
792 | /* VERIFICATION --------------------------------------------------------- */ |
793 | /* Be careful that the header sig included a bodyash */ | |
794 | ||
795 | if (sig->bodyhash.data && memcmp(bh.data, sig->bodyhash.data, bh.len) == 0) | |
3045f050 | 796 | { |
0d04a285 | 797 | DEBUG(D_acl) debug_printf("PDKIM [%s] Body hash verified OK\n", sig->domain); |
80a47a2c | 798 | } |
3045f050 JH |
799 | else |
800 | { | |
0d04a285 | 801 | DEBUG(D_acl) |
3045f050 | 802 | { |
e21a4d00 | 803 | debug_printf("PDKIM [%s] Body hash signature from headers: ", sig->domain); |
dcd03763 | 804 | pdkim_hexprint(sig->bodyhash.data, sig->bodyhash.len); |
0d04a285 | 805 | debug_printf("PDKIM [%s] Body hash did NOT verify\n", sig->domain); |
3045f050 | 806 | } |
3045f050 JH |
807 | sig->verify_status = PDKIM_VERIFY_FAIL; |
808 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY; | |
80a47a2c | 809 | } |
80a47a2c | 810 | } |
6ab02e3f | 811 | } |
80a47a2c TK |
812 | |
813 | ||
814 | ||
9e70917d | 815 | static void |
e983e85a JH |
816 | pdkim_body_complete(pdkim_ctx * ctx) |
817 | { | |
9e70917d | 818 | pdkim_signature * sig; |
e983e85a JH |
819 | |
820 | /* In simple body mode, if any empty lines were buffered, | |
821 | replace with one. rfc 4871 3.4.3 */ | |
822 | /*XXX checking the signed-body-bytes is a gross hack; I think | |
823 | it indicates that all linebreaks should be buffered, including | |
824 | the one terminating a text line */ | |
825 | ||
9e70917d JH |
826 | for (sig = ctx->sig; sig; sig = sig->next) |
827 | if ( sig->canon_body == PDKIM_CANON_SIMPLE | |
828 | && sig->signed_body_bytes == 0 | |
829 | && sig->num_buffered_blanklines > 0 | |
830 | ) | |
831 | (void) pdkim_update_sig_bodyhash(sig, &lineending, NULL); | |
e983e85a JH |
832 | |
833 | ctx->flags |= PDKIM_SEEN_EOD; | |
834 | ctx->linebuf_offset = 0; | |
e983e85a JH |
835 | } |
836 | ||
837 | ||
838 | ||
80a47a2c | 839 | /* -------------------------------------------------------------------------- */ |
e983e85a | 840 | /* Call from pdkim_feed below for processing complete body lines */ |
3045f050 | 841 | |
9e70917d JH |
842 | static void |
843 | pdkim_bodyline_complete(pdkim_ctx * ctx) | |
3045f050 | 844 | { |
9e70917d JH |
845 | blob line = {.data = ctx->linebuf, .len = ctx->linebuf_offset}; |
846 | pdkim_signature * sig; | |
847 | blob * rnl = NULL; | |
848 | blob * rline = NULL; | |
3045f050 JH |
849 | |
850 | /* Ignore extra data if we've seen the end-of-data marker */ | |
9e70917d | 851 | if (ctx->flags & PDKIM_SEEN_EOD) goto all_skip; |
3045f050 JH |
852 | |
853 | /* We've always got one extra byte to stuff a zero ... */ | |
9e70917d | 854 | ctx->linebuf[line.len] = '\0'; |
3045f050 | 855 | |
0d04a285 | 856 | /* Terminate on EOD marker */ |
e983e85a | 857 | if (ctx->flags & PDKIM_DOT_TERM) |
3045f050 | 858 | { |
9e70917d JH |
859 | if (memcmp(line.data, ".\r\n", 3) == 0) |
860 | { pdkim_body_complete(ctx); return; } | |
0d04a285 | 861 | |
e983e85a | 862 | /* Unstuff dots */ |
9e70917d JH |
863 | if (memcmp(line.data, "..", 2) == 0) |
864 | { line.data++; line.len--; } | |
80a47a2c TK |
865 | } |
866 | ||
3045f050 | 867 | /* Empty lines need to be buffered until we find a non-empty line */ |
9e70917d | 868 | if (memcmp(line.data, "\r\n", 2) == 0) |
3045f050 | 869 | { |
9e70917d JH |
870 | for (sig = ctx->sig; sig; sig = sig->next) sig->num_buffered_blanklines++; |
871 | goto all_skip; | |
80a47a2c TK |
872 | } |
873 | ||
9e70917d JH |
874 | /* Process line for each sig separately */ |
875 | for (sig = ctx->sig; sig; sig = sig->next) | |
3045f050 | 876 | { |
9e70917d | 877 | if (sig->canon_body == PDKIM_CANON_RELAXED) |
3045f050 | 878 | { |
9e70917d | 879 | /* Lines with just spaces need to be buffered too */ |
7845dbb3 | 880 | uschar * cp = line.data; |
9e70917d | 881 | char c; |
6a11a9e6 | 882 | |
9e70917d JH |
883 | while ((c = *cp)) |
884 | { | |
885 | if (c == '\r' && cp[1] == '\n') break; | |
886 | if (c != ' ' && c != '\t') goto sig_process; | |
887 | cp++; | |
888 | } | |
889 | ||
890 | sig->num_buffered_blanklines++; | |
891 | goto sig_skip; | |
6a11a9e6 JH |
892 | } |
893 | ||
9e70917d JH |
894 | sig_process: |
895 | /* At this point, we have a non-empty line, so release the buffered ones. */ | |
6a11a9e6 | 896 | |
9e70917d JH |
897 | while (sig->num_buffered_blanklines) |
898 | { | |
899 | rnl = pdkim_update_sig_bodyhash(sig, &lineending, rnl); | |
900 | sig->num_buffered_blanklines--; | |
901 | } | |
902 | ||
903 | rline = pdkim_update_sig_bodyhash(sig, &line, rline); | |
904 | sig_skip: ; | |
80a47a2c TK |
905 | } |
906 | ||
9e70917d JH |
907 | if (rnl) store_free(rnl); |
908 | if (rline) store_free(rline); | |
909 | ||
910 | all_skip: | |
80a47a2c | 911 | |
3045f050 | 912 | ctx->linebuf_offset = 0; |
9e70917d | 913 | return; |
80a47a2c TK |
914 | } |
915 | ||
916 | ||
917 | /* -------------------------------------------------------------------------- */ | |
918 | /* Callback from pdkim_feed below for processing complete headers */ | |
919 | #define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:" | |
3045f050 | 920 | |
f444c2c7 | 921 | static int |
2c0f3ea1 | 922 | pdkim_header_complete(pdkim_ctx * ctx) |
3045f050 | 923 | { |
2c0f3ea1 JH |
924 | pdkim_signature * sig, * last_sig; |
925 | ||
3045f050 | 926 | /* Special case: The last header can have an extra \r appended */ |
acec9514 JH |
927 | if ( (ctx->cur_header->ptr > 1) && |
928 | (ctx->cur_header->s[ctx->cur_header->ptr-1] == '\r') ) | |
929 | --ctx->cur_header->ptr; | |
930 | (void) string_from_gstring(ctx->cur_header); | |
80a47a2c | 931 | |
2c0f3ea1 | 932 | if (++ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL; |
80a47a2c | 933 | |
3045f050 | 934 | /* SIGNING -------------------------------------------------------------- */ |
e983e85a | 935 | if (ctx->flags & PDKIM_MODE_SIGN) |
0d04a285 | 936 | for (sig = ctx->sig; sig; sig = sig->next) /* Traverse all signatures */ |
80a47a2c | 937 | |
ab9152ff | 938 | /* Add header to the signed headers list (in reverse order) */ |
acec9514 | 939 | sig->headers = pdkim_prepend_stringlist(sig->headers, ctx->cur_header->s); |
94431adb | 940 | |
0d04a285 | 941 | /* VERIFICATION ----------------------------------------------------------- */ |
3045f050 | 942 | /* DKIM-Signature: headers are added to the verification list */ |
e983e85a | 943 | else |
3045f050 | 944 | { |
f6ee24a2 | 945 | #ifdef notdef |
bd8fbe36 JH |
946 | DEBUG(D_acl) |
947 | { | |
948 | debug_printf("PDKIM >> raw hdr: "); | |
acec9514 | 949 | pdkim_quoteprint(CUS ctx->cur_header->s, ctx->cur_header->ptr); |
bd8fbe36 | 950 | } |
f6ee24a2 | 951 | #endif |
acec9514 | 952 | if (strncasecmp(CCS ctx->cur_header->s, |
3045f050 | 953 | DKIM_SIGNATURE_HEADERNAME, |
e2e3255a | 954 | Ustrlen(DKIM_SIGNATURE_HEADERNAME)) == 0) |
3045f050 | 955 | { |
02c4f8fb JH |
956 | /* Create and chain new signature block. We could error-check for all |
957 | required tags here, but prefer to create the internal sig and expicitly | |
958 | fail verification of it later. */ | |
80a47a2c | 959 | |
0d04a285 | 960 | DEBUG(D_acl) debug_printf( |
3045f050 | 961 | "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); |
3045f050 | 962 | |
acec9514 | 963 | sig = pdkim_parse_sig_header(ctx, ctx->cur_header->s); |
02c4f8fb JH |
964 | |
965 | if (!(last_sig = ctx->sig)) | |
2c0f3ea1 | 966 | ctx->sig = sig; |
02c4f8fb | 967 | else |
3045f050 | 968 | { |
02c4f8fb | 969 | while (last_sig->next) last_sig = last_sig->next; |
2c0f3ea1 | 970 | last_sig->next = sig; |
80a47a2c TK |
971 | } |
972 | } | |
37f8b554 | 973 | |
eea19017 | 974 | /* all headers are stored for signature verification */ |
acec9514 | 975 | ctx->headers = pdkim_prepend_stringlist(ctx->headers, ctx->cur_header->s); |
80a47a2c TK |
976 | } |
977 | ||
3045f050 | 978 | BAIL: |
acec9514 | 979 | ctx->cur_header->s[ctx->cur_header->ptr = 0] = '\0'; /* leave buffer for reuse */ |
3045f050 | 980 | return PDKIM_OK; |
6ab02e3f | 981 | } |
80a47a2c TK |
982 | |
983 | ||
984 | ||
985 | /* -------------------------------------------------------------------------- */ | |
986 | #define HEADER_BUFFER_FRAG_SIZE 256 | |
3045f050 JH |
987 | |
988 | DLLEXPORT int | |
ef698bf6 | 989 | pdkim_feed(pdkim_ctx * ctx, uschar * data, int len) |
3045f050 | 990 | { |
02c4f8fb | 991 | int p, rc; |
3045f050 | 992 | |
e983e85a JH |
993 | /* Alternate EOD signal, used in non-dotstuffing mode */ |
994 | if (!data) | |
995 | pdkim_body_complete(ctx); | |
996 | ||
10c50704 | 997 | else for (p = 0; p<len; p++) |
3045f050 | 998 | { |
ca9cb170 | 999 | uschar c = data[p]; |
3045f050 | 1000 | |
e983e85a | 1001 | if (ctx->flags & PDKIM_PAST_HDRS) |
3045f050 | 1002 | { |
b895f4b2 JH |
1003 | if (c == '\n' && !(ctx->flags & PDKIM_SEEN_CR)) /* emulate the CR */ |
1004 | { | |
1005 | ctx->linebuf[ctx->linebuf_offset++] = '\r'; | |
1006 | if (ctx->linebuf_offset == PDKIM_MAX_BODY_LINE_LEN-1) | |
1007 | return PDKIM_ERR_LONG_LINE; | |
1008 | } | |
1009 | ||
3045f050 | 1010 | /* Processing body byte */ |
0d04a285 | 1011 | ctx->linebuf[ctx->linebuf_offset++] = c; |
b895f4b2 JH |
1012 | if (c == '\r') |
1013 | ctx->flags |= PDKIM_SEEN_CR; | |
1014 | else if (c == '\n') | |
3045f050 | 1015 | { |
b895f4b2 | 1016 | ctx->flags &= ~PDKIM_SEEN_CR; |
9e70917d | 1017 | pdkim_bodyline_complete(ctx); |
80a47a2c | 1018 | } |
b895f4b2 JH |
1019 | |
1020 | if (ctx->linebuf_offset == PDKIM_MAX_BODY_LINE_LEN-1) | |
3045f050 | 1021 | return PDKIM_ERR_LONG_LINE; |
80a47a2c | 1022 | } |
3045f050 JH |
1023 | else |
1024 | { | |
1025 | /* Processing header byte */ | |
b895f4b2 JH |
1026 | if (c == '\r') |
1027 | ctx->flags |= PDKIM_SEEN_CR; | |
1028 | else if (c == '\n') | |
3045f050 | 1029 | { |
b895f4b2 | 1030 | if (!(ctx->flags & PDKIM_SEEN_CR)) /* emulate the CR */ |
acec9514 | 1031 | ctx->cur_header = string_catn(ctx->cur_header, CUS "\r", 1); |
b895f4b2 | 1032 | |
02c4f8fb | 1033 | if (ctx->flags & PDKIM_SEEN_LF) /* Seen last header line */ |
b895f4b2 | 1034 | { |
02c4f8fb JH |
1035 | if ((rc = pdkim_header_complete(ctx)) != PDKIM_OK) |
1036 | return rc; | |
b895f4b2 | 1037 | |
863bd541 | 1038 | ctx->flags = (ctx->flags & ~(PDKIM_SEEN_LF|PDKIM_SEEN_CR)) | PDKIM_PAST_HDRS; |
b895f4b2 | 1039 | DEBUG(D_acl) debug_printf( |
02c4f8fb | 1040 | "PDKIM >> Body data for hash, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); |
b895f4b2 | 1041 | continue; |
3045f050 | 1042 | } |
b895f4b2 | 1043 | else |
863bd541 | 1044 | ctx->flags = (ctx->flags & ~PDKIM_SEEN_CR) | PDKIM_SEEN_LF; |
b895f4b2 JH |
1045 | } |
1046 | else if (ctx->flags & PDKIM_SEEN_LF) | |
1047 | { | |
02c4f8fb JH |
1048 | if (!(c == '\t' || c == ' ')) /* End of header */ |
1049 | if ((rc = pdkim_header_complete(ctx)) != PDKIM_OK) | |
1050 | return rc; | |
b895f4b2 | 1051 | ctx->flags &= ~PDKIM_SEEN_LF; |
80a47a2c | 1052 | } |
3045f050 | 1053 | |
acec9514 JH |
1054 | if (!ctx->cur_header || ctx->cur_header->ptr < PDKIM_MAX_HEADER_LEN) |
1055 | ctx->cur_header = string_catn(ctx->cur_header, CUS &data[p], 1); | |
80a47a2c TK |
1056 | } |
1057 | } | |
3045f050 | 1058 | return PDKIM_OK; |
6ab02e3f | 1059 | } |
80a47a2c | 1060 | |
ca9cb170 JH |
1061 | |
1062 | ||
acec9514 JH |
1063 | /* Extend a growing header with a continuation-linebreak */ |
1064 | static gstring * | |
1065 | pdkim_hdr_cont(gstring * str, int * col) | |
ca9cb170 JH |
1066 | { |
1067 | *col = 1; | |
acec9514 | 1068 | return string_catn(str, US"\r\n\t", 3); |
ca9cb170 JH |
1069 | } |
1070 | ||
1071 | ||
1072 | ||
05b7d6de JB |
1073 | /* |
1074 | * RFC 5322 specifies that header line length SHOULD be no more than 78 | |
1075 | * lets make it so! | |
1076 | * pdkim_headcat | |
ca9cb170 JH |
1077 | * |
1078 | * returns uschar * (not nul-terminated) | |
05b7d6de JB |
1079 | * |
1080 | * col: this int holds and receives column number (octets since last '\n') | |
1081 | * str: partial string to append to | |
94431adb | 1082 | * pad: padding, split line or space after before or after eg: ";" |
05b7d6de JB |
1083 | * intro: - must join to payload eg "h=", usually the tag name |
1084 | * payload: eg base64 data - long data can be split arbitrarily. | |
1085 | * | |
1086 | * this code doesn't fold the header in some of the places that RFC4871 | |
1087 | * allows: As per RFC5322(2.2.3) it only folds before or after tag-value | |
1088 | * pairs and inside long values. it also always spaces or breaks after the | |
94431adb | 1089 | * "pad" |
05b7d6de JB |
1090 | * |
1091 | * no guarantees are made for output given out-of range input. like tag | |
f444c2c7 | 1092 | * names longer than 78, or bogus col. Input is assumed to be free of line breaks. |
05b7d6de JB |
1093 | */ |
1094 | ||
acec9514 JH |
1095 | static gstring * |
1096 | pdkim_headcat(int * col, gstring * str, | |
ca9cb170 | 1097 | const uschar * pad, const uschar * intro, const uschar * payload) |
3045f050 JH |
1098 | { |
1099 | size_t l; | |
1100 | ||
1101 | if (pad) | |
05b7d6de | 1102 | { |
ca9cb170 | 1103 | l = Ustrlen(pad); |
3045f050 | 1104 | if (*col + l > 78) |
acec9514 JH |
1105 | str = pdkim_hdr_cont(str, col); |
1106 | str = string_catn(str, pad, l); | |
3045f050 | 1107 | *col += l; |
05b7d6de JB |
1108 | } |
1109 | ||
ca9cb170 | 1110 | l = (pad?1:0) + (intro?Ustrlen(intro):0); |
05b7d6de | 1111 | |
3045f050 | 1112 | if (*col + l > 78) |
05b7d6de | 1113 | { /*can't fit intro - start a new line to make room.*/ |
acec9514 | 1114 | str = pdkim_hdr_cont(str, col); |
ca9cb170 | 1115 | l = intro?Ustrlen(intro):0; |
05b7d6de JB |
1116 | } |
1117 | ||
ca9cb170 | 1118 | l += payload ? Ustrlen(payload):0 ; |
05b7d6de | 1119 | |
3045f050 | 1120 | while (l>77) |
05b7d6de | 1121 | { /* this fragment will not fit on a single line */ |
3045f050 | 1122 | if (pad) |
05b7d6de | 1123 | { |
acec9514 | 1124 | str = string_catn(str, US" ", 1); |
3045f050 JH |
1125 | *col += 1; |
1126 | pad = NULL; /* only want this once */ | |
1127 | l--; | |
05b7d6de | 1128 | } |
3045f050 JH |
1129 | |
1130 | if (intro) | |
05b7d6de | 1131 | { |
ca9cb170 | 1132 | size_t sl = Ustrlen(intro); |
3045f050 | 1133 | |
acec9514 | 1134 | str = string_catn(str, intro, sl); |
3045f050 JH |
1135 | *col += sl; |
1136 | l -= sl; | |
1137 | intro = NULL; /* only want this once */ | |
05b7d6de | 1138 | } |
3045f050 JH |
1139 | |
1140 | if (payload) | |
05b7d6de | 1141 | { |
ca9cb170 | 1142 | size_t sl = Ustrlen(payload); |
3045f050 JH |
1143 | size_t chomp = *col+sl < 77 ? sl : 78-*col; |
1144 | ||
acec9514 | 1145 | str = string_catn(str, payload, chomp); |
3045f050 JH |
1146 | *col += chomp; |
1147 | payload += chomp; | |
1148 | l -= chomp-1; | |
05b7d6de | 1149 | } |
3045f050 JH |
1150 | |
1151 | /* the while precondition tells us it didn't fit. */ | |
acec9514 | 1152 | str = pdkim_hdr_cont(str, col); |
05b7d6de | 1153 | } |
3045f050 JH |
1154 | |
1155 | if (*col + l > 78) | |
05b7d6de | 1156 | { |
acec9514 | 1157 | str = pdkim_hdr_cont(str, col); |
3045f050 | 1158 | pad = NULL; |
05b7d6de JB |
1159 | } |
1160 | ||
3045f050 | 1161 | if (pad) |
05b7d6de | 1162 | { |
acec9514 | 1163 | str = string_catn(str, US" ", 1); |
3045f050 JH |
1164 | *col += 1; |
1165 | pad = NULL; | |
05b7d6de JB |
1166 | } |
1167 | ||
3045f050 | 1168 | if (intro) |
05b7d6de | 1169 | { |
ca9cb170 | 1170 | size_t sl = Ustrlen(intro); |
3045f050 | 1171 | |
acec9514 | 1172 | str = string_catn(str, intro, sl); |
3045f050 JH |
1173 | *col += sl; |
1174 | l -= sl; | |
1175 | intro = NULL; | |
05b7d6de | 1176 | } |
3045f050 JH |
1177 | |
1178 | if (payload) | |
05b7d6de | 1179 | { |
ca9cb170 | 1180 | size_t sl = Ustrlen(payload); |
3045f050 | 1181 | |
acec9514 | 1182 | str = string_catn(str, payload, sl); |
3045f050 | 1183 | *col += sl; |
05b7d6de JB |
1184 | } |
1185 | ||
ca9cb170 | 1186 | return str; |
05b7d6de | 1187 | } |
80a47a2c | 1188 | |
3045f050 | 1189 | |
80a47a2c | 1190 | /* -------------------------------------------------------------------------- */ |
3045f050 | 1191 | |
ca9cb170 | 1192 | static uschar * |
9e70917d | 1193 | pdkim_create_header(pdkim_signature * sig, BOOL final) |
3045f050 | 1194 | { |
ca9cb170 JH |
1195 | uschar * base64_bh; |
1196 | uschar * base64_b; | |
3045f050 | 1197 | int col = 0; |
acec9514 JH |
1198 | gstring * hdr; |
1199 | gstring * canon_all; | |
3045f050 | 1200 | |
acec9514 JH |
1201 | canon_all = string_cat (NULL, pdkim_canons[sig->canon_headers]); |
1202 | canon_all = string_catn(canon_all, US"/", 1); | |
1203 | canon_all = string_cat (canon_all, pdkim_canons[sig->canon_body]); | |
1204 | (void) string_from_gstring(canon_all); | |
3045f050 | 1205 | |
acec9514 JH |
1206 | hdr = string_cat(NULL, US"DKIM-Signature: v="PDKIM_SIGNATURE_VERSION); |
1207 | col = hdr->ptr; | |
3045f050 JH |
1208 | |
1209 | /* Required and static bits */ | |
acec9514 JH |
1210 | hdr = pdkim_headcat(&col, hdr, US";", US"a=", dkim_sig_to_a_tag(sig)); |
1211 | hdr = pdkim_headcat(&col, hdr, US";", US"q=", pdkim_querymethods[sig->querymethod]); | |
1212 | hdr = pdkim_headcat(&col, hdr, US";", US"c=", canon_all->s); | |
1213 | hdr = pdkim_headcat(&col, hdr, US";", US"d=", sig->domain); | |
1214 | hdr = pdkim_headcat(&col, hdr, US";", US"s=", sig->selector); | |
ca9cb170 JH |
1215 | |
1216 | /* list of header names can be split between items. */ | |
3045f050 | 1217 | { |
e2e3255a | 1218 | uschar * n = string_copy(sig->headernames); |
ca9cb170 JH |
1219 | uschar * i = US"h="; |
1220 | uschar * s = US";"; | |
1221 | ||
1222 | while (*n) | |
05b7d6de | 1223 | { |
ca9cb170 | 1224 | uschar * c = Ustrchr(n, ':'); |
3045f050 | 1225 | |
ca9cb170 | 1226 | if (c) *c ='\0'; |
05b7d6de | 1227 | |
ca9cb170 | 1228 | if (!i) |
acec9514 | 1229 | hdr = pdkim_headcat(&col, hdr, NULL, NULL, US":"); |
05b7d6de | 1230 | |
acec9514 | 1231 | hdr = pdkim_headcat(&col, hdr, s, i, n); |
3045f050 | 1232 | |
ca9cb170 JH |
1233 | if (!c) |
1234 | break; | |
3045f050 | 1235 | |
ca9cb170 JH |
1236 | n = c+1; |
1237 | s = NULL; | |
1238 | i = NULL; | |
80a47a2c | 1239 | } |
ca9cb170 | 1240 | } |
05b7d6de | 1241 | |
ca9cb170 | 1242 | base64_bh = pdkim_encode_base64(&sig->bodyhash); |
acec9514 | 1243 | hdr = pdkim_headcat(&col, hdr, US";", US"bh=", base64_bh); |
3045f050 | 1244 | |
ca9cb170 JH |
1245 | /* Optional bits */ |
1246 | if (sig->identity) | |
acec9514 | 1247 | hdr = pdkim_headcat(&col, hdr, US";", US"i=", sig->identity); |
3045f050 | 1248 | |
ca9cb170 JH |
1249 | if (sig->created > 0) |
1250 | { | |
e2e3255a | 1251 | uschar minibuf[20]; |
3045f050 | 1252 | |
e2e3255a | 1253 | snprintf(CS minibuf, sizeof(minibuf), "%lu", sig->created); |
acec9514 | 1254 | hdr = pdkim_headcat(&col, hdr, US";", US"t=", minibuf); |
ca9cb170 | 1255 | } |
3045f050 | 1256 | |
ca9cb170 JH |
1257 | if (sig->expires > 0) |
1258 | { | |
e2e3255a | 1259 | uschar minibuf[20]; |
3045f050 | 1260 | |
e2e3255a | 1261 | snprintf(CS minibuf, sizeof(minibuf), "%lu", sig->expires); |
acec9514 | 1262 | hdr = pdkim_headcat(&col, hdr, US";", US"x=", minibuf); |
ca9cb170 | 1263 | } |
3045f050 | 1264 | |
ca9cb170 JH |
1265 | if (sig->bodylength >= 0) |
1266 | { | |
e2e3255a | 1267 | uschar minibuf[20]; |
80a47a2c | 1268 | |
e2e3255a | 1269 | snprintf(CS minibuf, sizeof(minibuf), "%lu", sig->bodylength); |
acec9514 | 1270 | hdr = pdkim_headcat(&col, hdr, US";", US"l=", minibuf); |
3045f050 | 1271 | } |
05b7d6de | 1272 | |
ca9cb170 | 1273 | /* Preliminary or final version? */ |
ea18931d JH |
1274 | if (final) |
1275 | { | |
1276 | base64_b = pdkim_encode_base64(&sig->sighash); | |
acec9514 | 1277 | hdr = pdkim_headcat(&col, hdr, US";", US"b=", base64_b); |
80a47a2c | 1278 | |
ea18931d | 1279 | /* add trailing semicolon: I'm not sure if this is actually needed */ |
acec9514 | 1280 | hdr = pdkim_headcat(&col, hdr, NULL, US";", US""); |
ea18931d JH |
1281 | } |
1282 | else | |
1283 | { | |
1284 | /* To satisfy the rule "all surrounding whitespace [...] deleted" | |
1285 | ( RFC 6376 section 3.7 ) we ensure there is no whitespace here. Otherwise | |
1286 | the headcat routine could insert a linebreak which the relaxer would reduce | |
1287 | to a single space preceding the terminating semicolon, resulting in an | |
1288 | incorrect header-hash. */ | |
acec9514 | 1289 | hdr = pdkim_headcat(&col, hdr, US";", US"b=;", US""); |
ea18931d | 1290 | } |
80a47a2c | 1291 | |
acec9514 | 1292 | return string_from_gstring(hdr); |
80a47a2c TK |
1293 | } |
1294 | ||
1295 | ||
cd1a5fe0 JH |
1296 | /* -------------------------------------------------------------------------- */ |
1297 | ||
1298 | static pdkim_pubkey * | |
b9df1829 JH |
1299 | pdkim_key_from_dns(pdkim_ctx * ctx, pdkim_signature * sig, ev_ctx * vctx, |
1300 | const uschar ** errstr) | |
cd1a5fe0 JH |
1301 | { |
1302 | uschar * dns_txt_name, * dns_txt_reply; | |
1303 | pdkim_pubkey * p; | |
cd1a5fe0 JH |
1304 | |
1305 | /* Fetch public key for signing domain, from DNS */ | |
1306 | ||
1307 | dns_txt_name = string_sprintf("%s._domainkey.%s.", sig->selector, sig->domain); | |
1308 | ||
1309 | dns_txt_reply = store_get(PDKIM_DNS_TXT_MAX_RECLEN); | |
1310 | memset(dns_txt_reply, 0, PDKIM_DNS_TXT_MAX_RECLEN); | |
1311 | ||
1312 | if ( ctx->dns_txt_callback(CS dns_txt_name, CS dns_txt_reply) != PDKIM_OK | |
1313 | || dns_txt_reply[0] == '\0' | |
1314 | ) | |
1315 | { | |
1316 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1317 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE; | |
1318 | return NULL; | |
1319 | } | |
1320 | ||
1321 | DEBUG(D_acl) | |
1322 | { | |
1323 | debug_printf( | |
1324 | "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n" | |
9e70917d JH |
1325 | " %s\n" |
1326 | " Raw record: ", | |
1327 | dns_txt_name); | |
cd1a5fe0 JH |
1328 | pdkim_quoteprint(CUS dns_txt_reply, Ustrlen(dns_txt_reply)); |
1329 | } | |
1330 | ||
1331 | if ( !(p = pdkim_parse_pubkey_record(ctx, CUS dns_txt_reply)) | |
1332 | || (Ustrcmp(p->srvtype, "*") != 0 && Ustrcmp(p->srvtype, "email") != 0) | |
1333 | ) | |
1334 | { | |
1335 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1336 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD; | |
1337 | ||
1338 | DEBUG(D_acl) | |
1339 | { | |
1340 | if (p) | |
1341 | debug_printf(" Invalid public key service type '%s'\n", p->srvtype); | |
1342 | else | |
1343 | debug_printf(" Error while parsing public key record\n"); | |
1344 | debug_printf( | |
1345 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1346 | } | |
1347 | return NULL; | |
1348 | } | |
1349 | ||
1350 | DEBUG(D_acl) debug_printf( | |
1351 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1352 | ||
1353 | /* Import public key */ | |
9b2583c4 | 1354 | if ((*errstr = exim_dkim_verify_init(&p->key, vctx))) |
cd1a5fe0 | 1355 | { |
b9df1829 | 1356 | DEBUG(D_acl) debug_printf("verify_init: %s\n", *errstr); |
cd1a5fe0 JH |
1357 | sig->verify_status = PDKIM_VERIFY_INVALID; |
1358 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_IMPORT; | |
1359 | return NULL; | |
1360 | } | |
1361 | ||
1362 | return p; | |
1363 | } | |
1364 | ||
1365 | ||
80a47a2c | 1366 | /* -------------------------------------------------------------------------- */ |
3045f050 JH |
1367 | |
1368 | DLLEXPORT int | |
b9df1829 JH |
1369 | pdkim_feed_finish(pdkim_ctx * ctx, pdkim_signature ** return_signatures, |
1370 | const uschar ** err) | |
3045f050 | 1371 | { |
9e70917d | 1372 | pdkim_signature * sig; |
3045f050 JH |
1373 | |
1374 | /* Check if we must still flush a (partial) header. If that is the | |
1375 | case, the message has no body, and we must compute a body hash | |
1376 | out of '<CR><LF>' */ | |
acec9514 | 1377 | if (ctx->cur_header && ctx->cur_header->ptr > 0) |
3045f050 | 1378 | { |
9e70917d JH |
1379 | blob * rnl = NULL; |
1380 | int rc; | |
1381 | ||
1382 | if ((rc = pdkim_header_complete(ctx)) != PDKIM_OK) | |
1383 | return rc; | |
1384 | ||
1385 | for (sig = ctx->sig; sig; sig = sig->next) | |
1386 | rnl = pdkim_update_sig_bodyhash(sig, &lineending, rnl); | |
1387 | if (rnl) store_free(rnl); | |
80a47a2c | 1388 | } |
3045f050 | 1389 | else |
0d04a285 | 1390 | DEBUG(D_acl) debug_printf( |
3045f050 | 1391 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 1392 | |
3045f050 | 1393 | /* Build (and/or evaluate) body hash */ |
ca9cb170 | 1394 | pdkim_finish_bodyhash(ctx); |
80a47a2c | 1395 | |
9e70917d | 1396 | for (sig = ctx->sig; sig; sig = sig->next) |
3045f050 | 1397 | { |
2592e6c0 | 1398 | hctx hhash_ctx; |
ad6f5499 | 1399 | uschar * sig_hdr = US""; |
2592e6c0 | 1400 | blob hhash; |
acec9514 | 1401 | gstring * hdata = NULL; |
2592e6c0 | 1402 | |
d73e45df | 1403 | if (!exim_sha_init(&hhash_ctx, pdkim_hashes[sig->hashtype].exim_hashmethod)) |
7b83389d | 1404 | { |
d73e45df JH |
1405 | DEBUG(D_acl) |
1406 | debug_printf("PDKIM: hash setup error, possibly nonhandled hashtype\n"); | |
7b83389d JH |
1407 | break; |
1408 | } | |
80a47a2c | 1409 | |
9e70917d JH |
1410 | if (ctx->flags & PDKIM_MODE_SIGN) |
1411 | DEBUG(D_acl) debug_printf( | |
1412 | "PDKIM >> Headers to be signed: >>>>>>>>>>>>\n" | |
1413 | " %s\n", | |
1414 | sig->sign_headers); | |
1415 | ||
0d04a285 | 1416 | DEBUG(D_acl) debug_printf( |
328c5688 | 1417 | "PDKIM >> Header data for hash, canonicalized, in sequence >>>>>>>>>>>>\n"); |
3045f050 | 1418 | |
9e70917d | 1419 | |
3045f050 JH |
1420 | /* SIGNING ---------------------------------------------------------------- */ |
1421 | /* When signing, walk through our header list and add them to the hash. As we | |
8ef02a06 JH |
1422 | go, construct a list of the header's names to use for the h= parameter. |
1423 | Then append to that list any remaining header names for which there was no | |
1424 | header to sign. */ | |
3045f050 | 1425 | |
e983e85a | 1426 | if (ctx->flags & PDKIM_MODE_SIGN) |
3045f050 | 1427 | { |
acec9514 | 1428 | gstring * g = NULL; |
3045f050 | 1429 | pdkim_stringlist *p; |
8ef02a06 JH |
1430 | const uschar * l; |
1431 | uschar * s; | |
1432 | int sep = 0; | |
3045f050 | 1433 | |
9e70917d JH |
1434 | sig->headernames = NULL; /* Collected signed header names */ |
1435 | ||
3045f050 | 1436 | for (p = sig->headers; p; p = p->next) |
9e70917d JH |
1437 | { |
1438 | uschar * rh = p->value; | |
1439 | ||
1440 | if (header_name_match(rh, sig->sign_headers) == PDKIM_OK) | |
ab9152ff | 1441 | { |
ab9152ff | 1442 | /* Collect header names (Note: colon presence is guaranteed here) */ |
acec9514 | 1443 | g = string_append_listele_n(g, ':', rh, Ustrchr(rh, ':') - rh); |
3045f050 | 1444 | |
9e70917d JH |
1445 | if (sig->canon_headers == PDKIM_CANON_RELAXED) |
1446 | rh = pdkim_relax_header(rh, TRUE); /* cook header for relaxed canon */ | |
3045f050 | 1447 | |
ab9152ff | 1448 | /* Feed header to the hash algorithm */ |
e2e3255a | 1449 | exim_sha_update(&hhash_ctx, CUS rh, Ustrlen(rh)); |
f444c2c7 | 1450 | |
ab9152ff | 1451 | /* Remember headers block for signing (when the library cannot do incremental) */ |
acec9514 | 1452 | hdata = exim_dkim_data_append(hdata, rh); |
3045f050 | 1453 | |
ab9152ff JH |
1454 | DEBUG(D_acl) pdkim_quoteprint(rh, Ustrlen(rh)); |
1455 | } | |
9e70917d | 1456 | } |
8ef02a06 | 1457 | |
484cc1a9 JH |
1458 | /* Any headers we wanted to sign but were not present must also be listed. |
1459 | Ignore elements that have been ticked-off or are marked as never-oversign. */ | |
1460 | ||
ca9cb170 | 1461 | l = sig->sign_headers; |
8ef02a06 | 1462 | while((s = string_nextinlist(&l, &sep, NULL, 0))) |
484cc1a9 JH |
1463 | { |
1464 | if (*s == '+') /* skip oversigning marker */ | |
1465 | s++; | |
1466 | if (*s != '_' && *s != '=') | |
acec9514 | 1467 | g = string_append_listele(g, ':', s); |
484cc1a9 | 1468 | } |
acec9514 | 1469 | sig->headernames = string_from_gstring(g); |
ca9cb170 JH |
1470 | |
1471 | /* Create signature header with b= omitted */ | |
1472 | sig_hdr = pdkim_create_header(sig, FALSE); | |
80a47a2c | 1473 | } |
37f8b554 | 1474 | |
3045f050 JH |
1475 | /* VERIFICATION ----------------------------------------------------------- */ |
1476 | /* When verifying, walk through the header name list in the h= parameter and | |
1477 | add the headers to the hash in that order. */ | |
1478 | else | |
1479 | { | |
10c50704 | 1480 | uschar * p = sig->headernames; |
2592e6c0 JH |
1481 | uschar * q; |
1482 | pdkim_stringlist * hdrs; | |
3045f050 | 1483 | |
10c50704 | 1484 | if (p) |
3045f050 | 1485 | { |
10c50704 | 1486 | /* clear tags */ |
3045f050 | 1487 | for (hdrs = ctx->headers; hdrs; hdrs = hdrs->next) |
10c50704 | 1488 | hdrs->tag = 0; |
3045f050 | 1489 | |
10c50704 JH |
1490 | p = string_copy(p); |
1491 | while(1) | |
1492 | { | |
1493 | if ((q = Ustrchr(p, ':'))) | |
1494 | *q = '\0'; | |
1495 | ||
1496 | /*XXX walk the list of headers in same order as received. */ | |
1497 | for (hdrs = ctx->headers; hdrs; hdrs = hdrs->next) | |
1498 | if ( hdrs->tag == 0 | |
4dc2379a | 1499 | && strncasecmp(CCS hdrs->value, CCS p, Ustrlen(p)) == 0 |
10c50704 JH |
1500 | && (hdrs->value)[Ustrlen(p)] == ':' |
1501 | ) | |
1502 | { | |
1503 | /* cook header for relaxed canon, or just copy it for simple */ | |
1504 | ||
1505 | uschar * rh = sig->canon_headers == PDKIM_CANON_RELAXED | |
ea18931d | 1506 | ? pdkim_relax_header(hdrs->value, TRUE) |
10c50704 JH |
1507 | : string_copy(CUS hdrs->value); |
1508 | ||
1509 | /* Feed header to the hash algorithm */ | |
1510 | exim_sha_update(&hhash_ctx, CUS rh, Ustrlen(rh)); | |
1511 | ||
1512 | DEBUG(D_acl) pdkim_quoteprint(rh, Ustrlen(rh)); | |
1513 | hdrs->tag = 1; | |
1514 | break; | |
1515 | } | |
3045f050 | 1516 | |
10c50704 JH |
1517 | if (!q) break; |
1518 | p = q+1; | |
1519 | } | |
3045f050 | 1520 | |
10c50704 | 1521 | sig_hdr = string_copy(sig->rawsig_no_b_val); |
80a47a2c | 1522 | } |
80a47a2c TK |
1523 | } |
1524 | ||
0d04a285 | 1525 | DEBUG(D_acl) debug_printf( |
3045f050 | 1526 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 1527 | |
9e70917d JH |
1528 | DEBUG(D_acl) |
1529 | { | |
1530 | debug_printf( | |
1531 | "PDKIM >> Signed DKIM-Signature header, pre-canonicalized >>>>>>>>>>>>>\n"); | |
1532 | pdkim_quoteprint(CUS sig_hdr, Ustrlen(sig_hdr)); | |
1533 | debug_printf( | |
1534 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1535 | } | |
1536 | ||
3045f050 JH |
1537 | /* Relax header if necessary */ |
1538 | if (sig->canon_headers == PDKIM_CANON_RELAXED) | |
ea18931d | 1539 | sig_hdr = pdkim_relax_header(sig_hdr, FALSE); |
80a47a2c | 1540 | |
0d04a285 | 1541 | DEBUG(D_acl) |
3045f050 | 1542 | { |
0d04a285 | 1543 | debug_printf( |
3045f050 | 1544 | "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n"); |
e2e3255a | 1545 | pdkim_quoteprint(CUS sig_hdr, Ustrlen(sig_hdr)); |
0d04a285 | 1546 | debug_printf( |
3045f050 | 1547 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 1548 | } |
3045f050 JH |
1549 | |
1550 | /* Finalize header hash */ | |
e2e3255a | 1551 | exim_sha_update(&hhash_ctx, CUS sig_hdr, Ustrlen(sig_hdr)); |
2592e6c0 | 1552 | exim_sha_finish(&hhash_ctx, &hhash); |
3045f050 | 1553 | |
f444c2c7 JH |
1554 | DEBUG(D_acl) |
1555 | { | |
9e70917d JH |
1556 | debug_printf("PDKIM [%s] Header %s computed: ", |
1557 | sig->domain, pdkim_hashes[sig->hashtype].dkim_hashname); | |
2592e6c0 | 1558 | pdkim_hexprint(hhash.data, hhash.len); |
80a47a2c TK |
1559 | } |
1560 | ||
9e70917d JH |
1561 | /* Remember headers block for signing (when the signing library cannot do |
1562 | incremental) */ | |
e983e85a | 1563 | if (ctx->flags & PDKIM_MODE_SIGN) |
acec9514 | 1564 | hdata = exim_dkim_data_append(hdata, US sig_hdr); |
f444c2c7 | 1565 | |
3045f050 | 1566 | /* SIGNING ---------------------------------------------------------------- */ |
e983e85a | 1567 | if (ctx->flags & PDKIM_MODE_SIGN) |
3045f050 | 1568 | { |
2592e6c0 | 1569 | es_ctx sctx; |
f444c2c7 | 1570 | |
d73e45df | 1571 | /* Import private key, including the keytype */ |
9b2583c4 | 1572 | /*XXX extend for non-RSA algos */ |
d73e45df | 1573 | if ((*err = exim_dkim_signing_init(US sig->privkey, &sctx))) |
f444c2c7 | 1574 | { |
b9df1829 | 1575 | DEBUG(D_acl) debug_printf("signing_init: %s\n", *err); |
f444c2c7 JH |
1576 | return PDKIM_ERR_RSA_PRIVKEY; |
1577 | } | |
80a47a2c | 1578 | |
2592e6c0 JH |
1579 | /* Do signing. With OpenSSL we are signing the hash of headers just |
1580 | calculated, with GnuTLS we have to sign an entire block of headers | |
1581 | (due to available interfaces) and it recalculates the hash internally. */ | |
f444c2c7 | 1582 | |
acec9514 JH |
1583 | #if defined(SIGN_GNUTLS) |
1584 | hhash.data = hdata->s; | |
1585 | hhash.len = hdata->ptr; | |
f444c2c7 JH |
1586 | #endif |
1587 | ||
9b2583c4 | 1588 | /*XXX extend for non-RSA algos */ |
d73e45df JH |
1589 | if ((*err = exim_dkim_sign(&sctx, |
1590 | pdkim_hashes[sig->hashtype].exim_hashmethod, | |
acec9514 | 1591 | &hhash, &sig->sighash))) |
f444c2c7 | 1592 | { |
b9df1829 | 1593 | DEBUG(D_acl) debug_printf("signing: %s\n", *err); |
f444c2c7 JH |
1594 | return PDKIM_ERR_RSA_SIGNING; |
1595 | } | |
80a47a2c | 1596 | |
0d04a285 | 1597 | DEBUG(D_acl) |
3045f050 | 1598 | { |
0d04a285 | 1599 | debug_printf( "PDKIM [%s] b computed: ", sig->domain); |
dcd03763 | 1600 | pdkim_hexprint(sig->sighash.data, sig->sighash.len); |
80a47a2c | 1601 | } |
80a47a2c | 1602 | |
ca9cb170 | 1603 | sig->signature_header = pdkim_create_header(sig, TRUE); |
80a47a2c | 1604 | } |
80a47a2c | 1605 | |
3045f050 JH |
1606 | /* VERIFICATION ----------------------------------------------------------- */ |
1607 | else | |
1608 | { | |
2592e6c0 | 1609 | ev_ctx vctx; |
3045f050 | 1610 | |
07eeb4df | 1611 | /* Make sure we have all required signature tags */ |
1612 | if (!( sig->domain && *sig->domain | |
1613 | && sig->selector && *sig->selector | |
1614 | && sig->headernames && *sig->headernames | |
1615 | && sig->bodyhash.data | |
dcd03763 | 1616 | && sig->sighash.data |
d73e45df JH |
1617 | && sig->keytype >= 0 |
1618 | && sig->hashtype >= 0 | |
07eeb4df | 1619 | && sig->version |
1620 | ) ) | |
1621 | { | |
1622 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1623 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_SIGNATURE_ERROR; | |
1624 | ||
1625 | DEBUG(D_acl) debug_printf( | |
1626 | " Error in DKIM-Signature header: tags missing or invalid\n" | |
1627 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1628 | goto NEXT_VERIFY; | |
1629 | } | |
1630 | ||
1631 | /* Make sure sig uses supported DKIM version (only v1) */ | |
1632 | if (sig->version != 1) | |
1633 | { | |
1634 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1635 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_DKIM_VERSION; | |
1636 | ||
1637 | DEBUG(D_acl) debug_printf( | |
1638 | " Error in DKIM-Signature header: unsupported DKIM version\n" | |
1639 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1640 | goto NEXT_VERIFY; | |
1641 | } | |
1642 | ||
9e70917d JH |
1643 | DEBUG(D_acl) |
1644 | { | |
1645 | debug_printf( "PDKIM [%s] b from mail: ", sig->domain); | |
1646 | pdkim_hexprint(sig->sighash.data, sig->sighash.len); | |
1647 | } | |
1648 | ||
b9df1829 | 1649 | if (!(sig->pubkey = pdkim_key_from_dns(ctx, sig, &vctx, err))) |
3045f050 | 1650 | goto NEXT_VERIFY; |
80a47a2c | 1651 | |
135e9496 JH |
1652 | /* If the pubkey limits to a list of specific hashes, ignore sigs that |
1653 | do not have the hash part of the sig algorithm matching */ | |
1654 | ||
1655 | if (sig->pubkey->hashes) | |
1656 | { | |
1657 | const uschar * list = sig->pubkey->hashes, * ele; | |
1658 | int sep = ':'; | |
1659 | while ((ele = string_nextinlist(&list, &sep, NULL, 0))) | |
d73e45df | 1660 | if (Ustrcmp(ele, pdkim_hashes[sig->hashtype].dkim_hashname) == 0) break; |
135e9496 JH |
1661 | if (!ele) |
1662 | { | |
d73e45df JH |
1663 | DEBUG(D_acl) debug_printf("pubkey h=%s vs. sig a=%s_%s\n", |
1664 | sig->pubkey->hashes, | |
1665 | pdkim_keytypes[sig->keytype], | |
1666 | pdkim_hashes[sig->hashtype].dkim_hashname); | |
135e9496 JH |
1667 | sig->verify_status = PDKIM_VERIFY_FAIL; |
1668 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_SIG_ALGO_MISMATCH; | |
1669 | goto NEXT_VERIFY; | |
1670 | } | |
1671 | } | |
1672 | ||
3045f050 | 1673 | /* Check the signature */ |
9b2583c4 | 1674 | /*XXX needs extension for non-RSA */ |
d73e45df JH |
1675 | if ((*err = exim_dkim_verify(&vctx, |
1676 | pdkim_hashes[sig->hashtype].exim_hashmethod, | |
1677 | &hhash, &sig->sighash))) | |
3045f050 | 1678 | { |
b9df1829 | 1679 | DEBUG(D_acl) debug_printf("headers verify: %s\n", *err); |
3045f050 JH |
1680 | sig->verify_status = PDKIM_VERIFY_FAIL; |
1681 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE; | |
1682 | goto NEXT_VERIFY; | |
ff7ddfd7 TK |
1683 | } |
1684 | ||
2592e6c0 | 1685 | |
4c04137d | 1686 | /* We have a winner! (if bodyhash was correct earlier) */ |
3045f050 JH |
1687 | if (sig->verify_status == PDKIM_VERIFY_NONE) |
1688 | sig->verify_status = PDKIM_VERIFY_PASS; | |
1689 | ||
1690 | NEXT_VERIFY: | |
1691 | ||
0d04a285 | 1692 | DEBUG(D_acl) |
3045f050 | 1693 | { |
0d04a285 | 1694 | debug_printf("PDKIM [%s] signature status: %s", |
3045f050 JH |
1695 | sig->domain, pdkim_verify_status_str(sig->verify_status)); |
1696 | if (sig->verify_ext_status > 0) | |
0d04a285 | 1697 | debug_printf(" (%s)\n", |
3045f050 JH |
1698 | pdkim_verify_ext_status_str(sig->verify_ext_status)); |
1699 | else | |
0d04a285 | 1700 | debug_printf("\n"); |
80a47a2c | 1701 | } |
80a47a2c | 1702 | } |
80a47a2c TK |
1703 | } |
1704 | ||
3045f050 JH |
1705 | /* If requested, set return pointer to signature(s) */ |
1706 | if (return_signatures) | |
1707 | *return_signatures = ctx->sig; | |
80a47a2c | 1708 | |
3045f050 | 1709 | return PDKIM_OK; |
80a47a2c TK |
1710 | } |
1711 | ||
1712 | ||
1713 | /* -------------------------------------------------------------------------- */ | |
3045f050 JH |
1714 | |
1715 | DLLEXPORT pdkim_ctx * | |
e983e85a | 1716 | pdkim_init_verify(int(*dns_txt_callback)(char *, char *), BOOL dot_stuffing) |
3045f050 | 1717 | { |
ca9cb170 | 1718 | pdkim_ctx * ctx; |
3045f050 | 1719 | |
ca9cb170 | 1720 | ctx = store_get(sizeof(pdkim_ctx)); |
abe1010c | 1721 | memset(ctx, 0, sizeof(pdkim_ctx)); |
3045f050 | 1722 | |
e983e85a | 1723 | if (dot_stuffing) ctx->flags = PDKIM_DOT_TERM; |
ca9cb170 | 1724 | ctx->linebuf = store_get(PDKIM_MAX_BODY_LINE_LEN); |
3045f050 | 1725 | ctx->dns_txt_callback = dns_txt_callback; |
80a47a2c | 1726 | |
3045f050 | 1727 | return ctx; |
80a47a2c TK |
1728 | } |
1729 | ||
1730 | ||
1731 | /* -------------------------------------------------------------------------- */ | |
80a47a2c | 1732 | |
d73e45df | 1733 | /*XXX ? needs extension to cover non-RSA algo? */ |
9b2583c4 | 1734 | |
9e70917d JH |
1735 | DLLEXPORT pdkim_signature * |
1736 | pdkim_init_sign(pdkim_ctx * ctx, | |
1737 | uschar * domain, uschar * selector, uschar * privkey, | |
1738 | uschar * hashname, const uschar ** errstr) | |
3045f050 | 1739 | { |
d73e45df | 1740 | int hashtype; |
cd1a5fe0 | 1741 | pdkim_signature * sig; |
80a47a2c | 1742 | |
d73e45df | 1743 | if (!domain || !selector || !privkey) |
3045f050 | 1744 | return NULL; |
80a47a2c | 1745 | |
9e70917d | 1746 | /* Allocate & init one signature struct */ |
80a47a2c | 1747 | |
9e70917d | 1748 | sig = store_get(sizeof(pdkim_signature)); |
abe1010c | 1749 | memset(sig, 0, sizeof(pdkim_signature)); |
80a47a2c | 1750 | |
3045f050 | 1751 | sig->bodylength = -1; |
80a47a2c | 1752 | |
e2e3255a JH |
1753 | sig->domain = string_copy(US domain); |
1754 | sig->selector = string_copy(US selector); | |
d73e45df JH |
1755 | sig->privkey = string_copy(US privkey); |
1756 | /*XXX no keytype yet; comes from privkey */ | |
cb224393 | 1757 | |
d73e45df JH |
1758 | for (hashtype = 0; hashtype < nelem(pdkim_hashes); hashtype++) |
1759 | if (Ustrcmp(hashname, pdkim_hashes[hashtype].dkim_hashname) == 0) | |
1760 | { sig->hashtype = hashtype; break; } | |
1761 | if (hashtype >= nelem(pdkim_hashes)) | |
7b83389d | 1762 | { |
d73e45df JH |
1763 | DEBUG(D_acl) |
1764 | debug_printf("PDKIM: unrecognised hashname '%s'\n", hashname); | |
1765 | return NULL; | |
1766 | } | |
1767 | ||
1768 | if (!exim_sha_init(&sig->body_hash_ctx, pdkim_hashes[hashtype].exim_hashmethod)) | |
1769 | { | |
1770 | DEBUG(D_acl) | |
1771 | debug_printf("PDKIM: hash setup error, possibly nonhandled hashtype\n"); | |
7b83389d JH |
1772 | return NULL; |
1773 | } | |
1774 | ||
cd1a5fe0 JH |
1775 | DEBUG(D_acl) |
1776 | { | |
1777 | pdkim_signature s = *sig; | |
1778 | ev_ctx vctx; | |
1779 | ||
328c5688 | 1780 | debug_printf("PDKIM (checking verify key)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); |
b9df1829 | 1781 | if (!pdkim_key_from_dns(ctx, &s, &vctx, errstr)) |
cd1a5fe0 | 1782 | debug_printf("WARNING: bad dkim key in dns\n"); |
328c5688 | 1783 | debug_printf("PDKIM (finished checking verify key)<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
cd1a5fe0 | 1784 | } |
9e70917d | 1785 | return sig; |
6ab02e3f | 1786 | } |
80a47a2c | 1787 | |
f444c2c7 | 1788 | |
80a47a2c | 1789 | /* -------------------------------------------------------------------------- */ |
3045f050 | 1790 | |
9e70917d JH |
1791 | DLLEXPORT void |
1792 | pdkim_set_optional(pdkim_signature * sig, | |
1793 | char * sign_headers, | |
1794 | char * identity, | |
80a47a2c TK |
1795 | int canon_headers, |
1796 | int canon_body, | |
1797 | long bodylength, | |
80a47a2c | 1798 | unsigned long created, |
3045f050 JH |
1799 | unsigned long expires) |
1800 | { | |
3045f050 | 1801 | if (identity) |
e2e3255a | 1802 | sig->identity = string_copy(US identity); |
80a47a2c | 1803 | |
ca9cb170 JH |
1804 | sig->sign_headers = string_copy(sign_headers |
1805 | ? US sign_headers : US PDKIM_DEFAULT_SIGN_HEADERS); | |
80a47a2c | 1806 | |
8ef02a06 JH |
1807 | sig->canon_headers = canon_headers; |
1808 | sig->canon_body = canon_body; | |
1809 | sig->bodylength = bodylength; | |
1810 | sig->created = created; | |
1811 | sig->expires = expires; | |
80a47a2c | 1812 | |
9e70917d JH |
1813 | return; |
1814 | } | |
1815 | ||
1816 | ||
1817 | ||
1818 | void | |
1819 | pdkim_init_context(pdkim_ctx * ctx, BOOL dot_stuffed, | |
1820 | int(*dns_txt_callback)(char *, char *)) | |
1821 | { | |
1822 | memset(ctx, 0, sizeof(pdkim_ctx)); | |
1823 | ctx->flags = dot_stuffed ? PDKIM_MODE_SIGN | PDKIM_DOT_TERM : PDKIM_MODE_SIGN; | |
1824 | ctx->linebuf = store_get(PDKIM_MAX_BODY_LINE_LEN); | |
1825 | DEBUG(D_acl) ctx->dns_txt_callback = dns_txt_callback; | |
6ab02e3f | 1826 | } |
3045f050 | 1827 | |
3045f050 | 1828 | |
2592e6c0 JH |
1829 | void |
1830 | pdkim_init(void) | |
1831 | { | |
9b2583c4 | 1832 | exim_dkim_init(); |
2592e6c0 JH |
1833 | } |
1834 | ||
1835 | ||
1836 | ||
f444c2c7 | 1837 | #endif /*DISABLE_DKIM*/ |