Commit | Line | Data |
---|---|---|
80a47a2c TK |
1 | /* |
2 | * PDKIM - a RFC4871 (DKIM) implementation | |
3 | * | |
f444c2c7 JH |
4 | * Copyright (C) 2009 - 2016 Tom Kistner <tom@duncanthrax.net> |
5 | * Copyright (C) 2016 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 | |
cb224393 JH |
35 | #ifdef RSA_OPENSSL |
36 | # include <openssl/rsa.h> | |
37 | # include <openssl/ssl.h> | |
38 | # include <openssl/err.h> | |
39 | #elif defined(RSA_GNUTLS) | |
f444c2c7 JH |
40 | # include <gnutls/gnutls.h> |
41 | # include <gnutls/x509.h> | |
42 | # include <gnutls/abstract.h> | |
cb224393 JH |
43 | #endif |
44 | ||
45 | #ifdef SHA_GNUTLS | |
f444c2c7 | 46 | # include <gnutls/crypto.h> |
cb224393 JH |
47 | #elif defined(SHA_POLARSSL) |
48 | # include "polarssl/sha1.h" | |
49 | # include "polarssl/sha2.h" | |
f444c2c7 JH |
50 | #endif |
51 | ||
52 | #include "pdkim.h" | |
80a47a2c TK |
53 | |
54 | #define PDKIM_SIGNATURE_VERSION "1" | |
55 | #define PDKIM_PUB_RECORD_VERSION "DKIM1" | |
56 | ||
57 | #define PDKIM_MAX_HEADER_LEN 65536 | |
58 | #define PDKIM_MAX_HEADERS 512 | |
59 | #define PDKIM_MAX_BODY_LINE_LEN 16384 | |
60 | #define PDKIM_DNS_TXT_MAX_NAMELEN 1024 | |
61 | #define PDKIM_DEFAULT_SIGN_HEADERS "From:Sender:Reply-To:Subject:Date:"\ | |
62 | "Message-ID:To:Cc:MIME-Version:Content-Type:"\ | |
63 | "Content-Transfer-Encoding:Content-ID:"\ | |
64 | "Content-Description:Resent-Date:Resent-From:"\ | |
65 | "Resent-Sender:Resent-To:Resent-Cc:"\ | |
66 | "Resent-Message-ID:In-Reply-To:References:"\ | |
67 | "List-Id:List-Help:List-Unsubscribe:"\ | |
68 | "List-Subscribe:List-Post:List-Owner:List-Archive" | |
69 | ||
70 | /* -------------------------------------------------------------------------- */ | |
71 | struct pdkim_stringlist { | |
72 | char *value; | |
37f8b554 | 73 | int tag; |
80a47a2c TK |
74 | void *next; |
75 | }; | |
76 | ||
77 | #define PDKIM_STR_ALLOC_FRAG 256 | |
78 | struct pdkim_str { | |
79 | char *str; | |
80 | unsigned int len; | |
81 | unsigned int allocated; | |
82 | }; | |
83 | ||
84 | /* -------------------------------------------------------------------------- */ | |
85 | /* A bunch of list constants */ | |
1ba28e2b | 86 | const char *pdkim_querymethods[] = { |
80a47a2c TK |
87 | "dns/txt", |
88 | NULL | |
89 | }; | |
1ba28e2b | 90 | const char *pdkim_algos[] = { |
80a47a2c TK |
91 | "rsa-sha256", |
92 | "rsa-sha1", | |
93 | NULL | |
94 | }; | |
1ba28e2b | 95 | const char *pdkim_canons[] = { |
80a47a2c TK |
96 | "simple", |
97 | "relaxed", | |
98 | NULL | |
99 | }; | |
1ba28e2b | 100 | const char *pdkim_hashes[] = { |
80a47a2c TK |
101 | "sha256", |
102 | "sha1", | |
103 | NULL | |
104 | }; | |
1ba28e2b | 105 | const char *pdkim_keytypes[] = { |
80a47a2c TK |
106 | "rsa", |
107 | NULL | |
108 | }; | |
109 | ||
110 | typedef struct pdkim_combined_canon_entry { | |
1ba28e2b | 111 | const char *str; |
80a47a2c TK |
112 | int canon_headers; |
113 | int canon_body; | |
114 | } pdkim_combined_canon_entry; | |
f444c2c7 | 115 | |
80a47a2c TK |
116 | pdkim_combined_canon_entry pdkim_combined_canons[] = { |
117 | { "simple/simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, | |
118 | { "simple/relaxed", PDKIM_CANON_SIMPLE, PDKIM_CANON_RELAXED }, | |
119 | { "relaxed/simple", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, | |
120 | { "relaxed/relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_RELAXED }, | |
121 | { "simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, | |
122 | { "relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, | |
123 | { NULL, 0, 0 } | |
124 | }; | |
125 | ||
126 | ||
f444c2c7 JH |
127 | /* -------------------------------------------------------------------------- */ |
128 | ||
129 | const char * | |
130 | pdkim_verify_status_str(int status) | |
131 | { | |
ff7ddfd7 TK |
132 | switch(status) { |
133 | case PDKIM_VERIFY_NONE: return "PDKIM_VERIFY_NONE"; | |
134 | case PDKIM_VERIFY_INVALID: return "PDKIM_VERIFY_INVALID"; | |
135 | case PDKIM_VERIFY_FAIL: return "PDKIM_VERIFY_FAIL"; | |
136 | case PDKIM_VERIFY_PASS: return "PDKIM_VERIFY_PASS"; | |
137 | default: return "PDKIM_VERIFY_UNKNOWN"; | |
138 | } | |
139 | } | |
f444c2c7 JH |
140 | |
141 | const char * | |
142 | pdkim_verify_ext_status_str(int ext_status) | |
143 | { | |
ff7ddfd7 TK |
144 | switch(ext_status) { |
145 | case PDKIM_VERIFY_FAIL_BODY: return "PDKIM_VERIFY_FAIL_BODY"; | |
146 | case PDKIM_VERIFY_FAIL_MESSAGE: return "PDKIM_VERIFY_FAIL_MESSAGE"; | |
147 | case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE"; | |
148 | case PDKIM_VERIFY_INVALID_BUFFER_SIZE: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE"; | |
df3def24 JH |
149 | case PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD: return "PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD"; |
150 | case PDKIM_VERIFY_INVALID_PUBKEY_IMPORT: return "PDKIM_VERIFY_INVALID_PUBKEY_IMPORT"; | |
ff7ddfd7 TK |
151 | default: return "PDKIM_VERIFY_UNKNOWN"; |
152 | } | |
153 | } | |
154 | ||
155 | ||
80a47a2c TK |
156 | /* -------------------------------------------------------------------------- */ |
157 | /* Print debugging functions */ | |
3045f050 | 158 | void |
0d04a285 | 159 | pdkim_quoteprint(const char *data, int len, int lf) |
3045f050 JH |
160 | { |
161 | int i; | |
162 | const unsigned char *p = (const unsigned char *)data; | |
163 | ||
0d04a285 | 164 | for (i = 0; i < len; i++) |
3045f050 JH |
165 | { |
166 | const int c = p[i]; | |
167 | switch (c) | |
168 | { | |
0d04a285 JH |
169 | case ' ' : debug_printf("{SP}"); break; |
170 | case '\t': debug_printf("{TB}"); break; | |
171 | case '\r': debug_printf("{CR}"); break; | |
172 | case '\n': debug_printf("{LF}"); break; | |
173 | case '{' : debug_printf("{BO}"); break; | |
174 | case '}' : debug_printf("{BC}"); break; | |
3045f050 JH |
175 | default: |
176 | if ( (c < 32) || (c > 127) ) | |
0d04a285 | 177 | debug_printf("{%02x}", c); |
3045f050 | 178 | else |
0d04a285 | 179 | debug_printf("%c", c); |
80a47a2c TK |
180 | break; |
181 | } | |
182 | } | |
3045f050 | 183 | if (lf) |
0d04a285 | 184 | debug_printf("\n"); |
80a47a2c | 185 | } |
80a47a2c | 186 | |
3045f050 | 187 | void |
0d04a285 | 188 | pdkim_hexprint(const char *data, int len, int lf) |
3045f050 JH |
189 | { |
190 | int i; | |
191 | const unsigned char *p = (const unsigned char *)data; | |
192 | ||
0d04a285 JH |
193 | for (i = 0 ; i < len; i++) |
194 | debug_printf("%02x", p[i]); | |
3045f050 | 195 | if (lf) |
0d04a285 | 196 | debug_printf("\n"); |
80a47a2c | 197 | } |
80a47a2c TK |
198 | |
199 | ||
f444c2c7 JH |
200 | |
201 | /* String package: should be replaced by Exim standard ones */ | |
202 | ||
203 | static pdkim_stringlist * | |
204 | pdkim_prepend_stringlist(pdkim_stringlist *base, char *str) | |
3045f050 JH |
205 | { |
206 | pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist)); | |
207 | ||
208 | if (!new_entry) return NULL; | |
abe1010c | 209 | memset(new_entry, 0, sizeof(pdkim_stringlist)); |
3045f050 JH |
210 | if (!(new_entry->value = strdup(str))) return NULL; |
211 | if (base) | |
212 | { | |
213 | pdkim_stringlist *last = base; | |
214 | while (last->next != NULL) { last = last->next; } | |
215 | last->next = new_entry; | |
216 | return base; | |
97713345 | 217 | } |
3045f050 | 218 | else |
97713345 | 219 | return new_entry; |
6ab02e3f | 220 | } |
80a47a2c TK |
221 | |
222 | ||
223 | /* -------------------------------------------------------------------------- */ | |
224 | /* A small "growing string" implementation to escape malloc/realloc hell */ | |
3045f050 | 225 | |
f444c2c7 | 226 | static pdkim_str * |
3045f050 JH |
227 | pdkim_strnew (const char *cstr) |
228 | { | |
229 | unsigned int len = cstr ? strlen(cstr) : 0; | |
230 | pdkim_str *p = malloc(sizeof(pdkim_str)); | |
231 | ||
232 | if (!p) return NULL; | |
abe1010c | 233 | memset(p, 0, sizeof(pdkim_str)); |
3045f050 JH |
234 | if (!(p->str = malloc(len+1))) |
235 | { | |
236 | free(p); | |
237 | return NULL; | |
80a47a2c | 238 | } |
3045f050 JH |
239 | p->allocated = len+1; |
240 | p->len = len; | |
241 | if (cstr) | |
abe1010c | 242 | strcpy(p->str, cstr); |
3045f050 JH |
243 | else |
244 | p->str[p->len] = '\0'; | |
245 | return p; | |
6ab02e3f | 246 | } |
3045f050 | 247 | |
f444c2c7 | 248 | static char * |
3045f050 JH |
249 | pdkim_strncat(pdkim_str *str, const char *data, int len) |
250 | { | |
251 | if ((str->allocated - str->len) < (len+1)) | |
252 | { | |
253 | /* Extend the buffer */ | |
254 | int num_frags = ((len+1)/PDKIM_STR_ALLOC_FRAG)+1; | |
255 | char *n = realloc(str->str, | |
256 | (str->allocated+(num_frags*PDKIM_STR_ALLOC_FRAG))); | |
257 | if (n == NULL) return NULL; | |
258 | str->str = n; | |
259 | str->allocated += (num_frags*PDKIM_STR_ALLOC_FRAG); | |
80a47a2c | 260 | } |
3045f050 JH |
261 | strncpy(&(str->str[str->len]), data, len); |
262 | str->len += len; | |
263 | str->str[str->len] = '\0'; | |
264 | return str->str; | |
6ab02e3f | 265 | } |
3045f050 | 266 | |
f444c2c7 | 267 | static char * |
3045f050 JH |
268 | pdkim_strcat(pdkim_str *str, const char *cstr) |
269 | { | |
270 | return pdkim_strncat(str, cstr, strlen(cstr)); | |
6ab02e3f | 271 | } |
05b7d6de | 272 | |
f444c2c7 | 273 | static char * |
3045f050 JH |
274 | pdkim_strtrim(pdkim_str *str) |
275 | { | |
276 | char *p = str->str; | |
277 | char *q = str->str; | |
278 | while ( (*p != '\0') && ((*p == '\t') || (*p == ' ')) ) p++; | |
279 | while (*p != '\0') {*q = *p; q++; p++;} | |
280 | *q = '\0'; | |
281 | while ( (q != str->str) && ( (*q == '\0') || (*q == '\t') || (*q == ' ') ) ) | |
282 | { | |
80a47a2c | 283 | *q = '\0'; |
3045f050 | 284 | q--; |
80a47a2c | 285 | } |
3045f050 JH |
286 | str->len = strlen(str->str); |
287 | return str->str; | |
6ab02e3f | 288 | } |
3045f050 | 289 | |
f444c2c7 | 290 | static char * |
3045f050 JH |
291 | pdkim_strclear(pdkim_str *str) |
292 | { | |
293 | str->str[0] = '\0'; | |
294 | str->len = 0; | |
295 | return str->str; | |
6ab02e3f | 296 | } |
3045f050 | 297 | |
f444c2c7 | 298 | static void |
3045f050 JH |
299 | pdkim_strfree(pdkim_str *str) |
300 | { | |
301 | if (!str) return; | |
302 | if (str->str) free(str->str); | |
303 | free(str); | |
6ab02e3f | 304 | } |
80a47a2c TK |
305 | |
306 | ||
307 | ||
308 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 309 | |
f444c2c7 | 310 | static void |
3045f050 JH |
311 | pdkim_free_pubkey(pdkim_pubkey *pub) |
312 | { | |
313 | if (pub) | |
314 | { | |
315 | if (pub->version ) free(pub->version); | |
316 | if (pub->granularity) free(pub->granularity); | |
317 | if (pub->hashes ) free(pub->hashes); | |
318 | if (pub->keytype ) free(pub->keytype); | |
319 | if (pub->srvtype ) free(pub->srvtype); | |
320 | if (pub->notes ) free(pub->notes); | |
f4d091fb | 321 | /* if (pub->key ) free(pub->key); */ |
3045f050 | 322 | free(pub); |
80a47a2c TK |
323 | } |
324 | } | |
325 | ||
326 | ||
327 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 328 | |
f444c2c7 | 329 | static void |
3045f050 JH |
330 | pdkim_free_sig(pdkim_signature *sig) |
331 | { | |
332 | if (sig) | |
333 | { | |
334 | pdkim_signature *next = (pdkim_signature *)sig->next; | |
335 | ||
336 | pdkim_stringlist *e = sig->headers; | |
337 | while(e) | |
338 | { | |
339 | pdkim_stringlist *c = e; | |
340 | if (e->value) free(e->value); | |
341 | e = e->next; | |
342 | free(c); | |
80a47a2c TK |
343 | } |
344 | ||
3045f050 JH |
345 | if (sig->selector ) free(sig->selector); |
346 | if (sig->domain ) free(sig->domain); | |
347 | if (sig->identity ) free(sig->identity); | |
348 | if (sig->headernames ) free(sig->headernames); | |
349 | if (sig->copiedheaders ) free(sig->copiedheaders); | |
350 | if (sig->rsa_privkey ) free(sig->rsa_privkey); | |
351 | if (sig->sign_headers ) free(sig->sign_headers); | |
352 | if (sig->signature_header) free(sig->signature_header); | |
3045f050 JH |
353 | |
354 | if (sig->pubkey) pdkim_free_pubkey(sig->pubkey); | |
355 | ||
356 | free(sig); | |
357 | if (next) pdkim_free_sig(next); | |
80a47a2c | 358 | } |
6ab02e3f | 359 | } |
80a47a2c TK |
360 | |
361 | ||
362 | /* -------------------------------------------------------------------------- */ | |
3045f050 JH |
363 | |
364 | DLLEXPORT void | |
365 | pdkim_free_ctx(pdkim_ctx *ctx) | |
366 | { | |
367 | if (ctx) | |
368 | { | |
369 | pdkim_stringlist *e = ctx->headers; | |
370 | while(e) | |
371 | { | |
372 | pdkim_stringlist *c = e; | |
373 | if (e->value) free(e->value); | |
374 | e = e->next; | |
375 | free(c); | |
37f8b554 | 376 | } |
3045f050 JH |
377 | pdkim_free_sig(ctx->sig); |
378 | pdkim_strfree(ctx->cur_header); | |
379 | free(ctx); | |
80a47a2c | 380 | } |
6ab02e3f | 381 | } |
80a47a2c TK |
382 | |
383 | ||
384 | /* -------------------------------------------------------------------------- */ | |
385 | /* Matches the name of the passed raw "header" against | |
386 | the passed colon-separated "list", starting at entry | |
387 | "start". Returns the position of the header name in | |
388 | the list. */ | |
3045f050 | 389 | |
f444c2c7 | 390 | static int |
3045f050 | 391 | header_name_match(const char *header, |
1ba28e2b | 392 | char *tick, |
3045f050 JH |
393 | int do_tick) |
394 | { | |
395 | char *hname; | |
396 | char *lcopy; | |
397 | char *p; | |
398 | char *q; | |
399 | int rc = PDKIM_FAIL; | |
400 | ||
401 | /* Get header name */ | |
abe1010c | 402 | char *hcolon = strchr(header, ':'); |
3045f050 JH |
403 | |
404 | if (!hcolon) return rc; /* This isn't a header */ | |
405 | ||
406 | if (!(hname = malloc((hcolon-header)+1))) | |
407 | return PDKIM_ERR_OOM; | |
abe1010c JH |
408 | memset(hname, 0, (hcolon-header)+1); |
409 | strncpy(hname, header, (hcolon-header)); | |
3045f050 JH |
410 | |
411 | /* Copy tick-off list locally, so we can punch zeroes into it */ | |
412 | if (!(lcopy = strdup(tick))) | |
413 | { | |
414 | free(hname); | |
415 | return PDKIM_ERR_OOM; | |
80a47a2c | 416 | } |
3045f050 | 417 | p = lcopy; |
abe1010c | 418 | q = strchr(p, ':'); |
3045f050 JH |
419 | while (q) |
420 | { | |
421 | *q = '\0'; | |
80a47a2c | 422 | |
abe1010c | 423 | if (strcasecmp(p, hname) == 0) |
3045f050 JH |
424 | { |
425 | rc = PDKIM_OK; | |
426 | /* Invalidate header name instance in tick-off list */ | |
427 | if (do_tick) tick[p-lcopy] = '_'; | |
428 | goto BAIL; | |
80a47a2c TK |
429 | } |
430 | ||
3045f050 | 431 | p = q+1; |
abe1010c | 432 | q = strchr(p, ':'); |
80a47a2c TK |
433 | } |
434 | ||
abe1010c | 435 | if (strcasecmp(p, hname) == 0) |
3045f050 JH |
436 | { |
437 | rc = PDKIM_OK; | |
438 | /* Invalidate header name instance in tick-off list */ | |
439 | if (do_tick) tick[p-lcopy] = '_'; | |
80a47a2c TK |
440 | } |
441 | ||
3045f050 JH |
442 | BAIL: |
443 | free(hname); | |
444 | free(lcopy); | |
445 | return rc; | |
80a47a2c TK |
446 | } |
447 | ||
448 | ||
449 | /* -------------------------------------------------------------------------- */ | |
450 | /* Performs "relaxed" canonicalization of a header. The returned pointer needs | |
451 | to be free()d. */ | |
3045f050 | 452 | |
f444c2c7 | 453 | static char * |
3045f050 JH |
454 | pdkim_relax_header (char *header, int crlf) |
455 | { | |
456 | BOOL past_field_name = FALSE; | |
457 | BOOL seen_wsp = FALSE; | |
458 | char *p; | |
459 | char *q; | |
460 | char *relaxed = malloc(strlen(header)+3); | |
461 | ||
462 | if (!relaxed) return NULL; | |
463 | ||
464 | q = relaxed; | |
465 | for (p = header; *p != '\0'; p++) | |
466 | { | |
467 | int c = *p; | |
468 | /* Ignore CR & LF */ | |
469 | if (c == '\r' || c == '\n') | |
470 | continue; | |
471 | if (c == '\t' || c == ' ') | |
472 | { | |
473 | if (seen_wsp) | |
80a47a2c | 474 | continue; |
3045f050 JH |
475 | c = ' '; /* Turns WSP into SP */ |
476 | seen_wsp = TRUE; | |
80a47a2c | 477 | } |
3045f050 JH |
478 | else |
479 | if (!past_field_name && c == ':') | |
480 | { | |
481 | if (seen_wsp) q--; /* This removes WSP before the colon */ | |
482 | seen_wsp = TRUE; /* This removes WSP after the colon */ | |
483 | past_field_name = TRUE; | |
80a47a2c | 484 | } |
3045f050 JH |
485 | else |
486 | seen_wsp = FALSE; | |
487 | ||
488 | /* Lowercase header name */ | |
489 | if (!past_field_name) c = tolower(c); | |
490 | *q++ = c; | |
80a47a2c | 491 | } |
3045f050 JH |
492 | |
493 | if (q > relaxed && q[-1] == ' ') q--; /* Squash eventual trailing SP */ | |
494 | *q = '\0'; | |
495 | ||
abe1010c | 496 | if (crlf) strcat(relaxed, "\r\n"); |
3045f050 | 497 | return relaxed; |
6ab02e3f | 498 | } |
80a47a2c TK |
499 | |
500 | ||
501 | /* -------------------------------------------------------------------------- */ | |
502 | #define PDKIM_QP_ERROR_DECODE -1 | |
3045f050 | 503 | |
a5840e10 | 504 | static char * |
3045f050 JH |
505 | pdkim_decode_qp_char(char *qp_p, int *c) |
506 | { | |
507 | char *initial_pos = qp_p; | |
508 | ||
509 | /* Advance one char */ | |
510 | qp_p++; | |
511 | ||
512 | /* Check for two hex digits and decode them */ | |
513 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) | |
514 | { | |
515 | /* Do hex conversion */ | |
516 | *c = (isdigit(*qp_p) ? *qp_p - '0' : toupper(*qp_p) - 'A' + 10) << 4; | |
a5840e10 | 517 | *c |= isdigit(qp_p[1]) ? qp_p[1] - '0' : toupper(qp_p[1]) - 'A' + 10; |
3045f050 | 518 | return qp_p + 2; |
6ab02e3f | 519 | } |
80a47a2c | 520 | |
3045f050 JH |
521 | /* Illegal char here */ |
522 | *c = PDKIM_QP_ERROR_DECODE; | |
523 | return initial_pos; | |
80a47a2c TK |
524 | } |
525 | ||
526 | ||
527 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 528 | |
f444c2c7 | 529 | static char * |
3045f050 JH |
530 | pdkim_decode_qp(char *str) |
531 | { | |
532 | int nchar = 0; | |
533 | char *q; | |
534 | char *p = str; | |
535 | char *n = malloc(strlen(p)+1); | |
536 | ||
537 | if (!n) return NULL; | |
538 | ||
539 | *n = '\0'; | |
540 | q = n; | |
541 | while (*p != '\0') | |
542 | { | |
543 | if (*p == '=') | |
544 | { | |
545 | p = pdkim_decode_qp_char(p, &nchar); | |
546 | if (nchar >= 0) | |
547 | { | |
548 | *q++ = nchar; | |
549 | continue; | |
80a47a2c TK |
550 | } |
551 | } | |
3045f050 JH |
552 | else |
553 | *q++ = *p; | |
554 | p++; | |
80a47a2c | 555 | } |
3045f050 JH |
556 | *q = '\0'; |
557 | return n; | |
80a47a2c TK |
558 | } |
559 | ||
560 | ||
561 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 562 | |
f444c2c7 | 563 | static char * |
3045f050 JH |
564 | pdkim_decode_base64(char *str, int *num_decoded) |
565 | { | |
566 | int dlen = 0; | |
567 | char *res; | |
f4d091fb | 568 | int old_pool = store_pool; |
3045f050 | 569 | |
f4d091fb JH |
570 | /* There is a store-reset between header & body reception |
571 | so cannot use the main pool */ | |
3045f050 | 572 | |
f4d091fb JH |
573 | store_pool = POOL_PERM; |
574 | dlen = b64decode(US str, USS &res); | |
575 | store_pool = old_pool; | |
576 | ||
577 | if (dlen < 0) return NULL; | |
3045f050 JH |
578 | |
579 | if (num_decoded) *num_decoded = dlen; | |
580 | return res; | |
80a47a2c TK |
581 | } |
582 | ||
3045f050 | 583 | |
80a47a2c | 584 | /* -------------------------------------------------------------------------- */ |
3045f050 | 585 | |
f444c2c7 | 586 | static char * |
3045f050 JH |
587 | pdkim_encode_base64(char *str, int num) |
588 | { | |
f4d091fb JH |
589 | char * ret; |
590 | int old_pool = store_pool; | |
3045f050 | 591 | |
f4d091fb JH |
592 | store_pool = POOL_PERM; |
593 | ret = CS b64encode(US str, num); | |
594 | store_pool = old_pool; | |
595 | return ret; | |
80a47a2c TK |
596 | } |
597 | ||
598 | ||
599 | /* -------------------------------------------------------------------------- */ | |
600 | #define PDKIM_HDR_LIMBO 0 | |
601 | #define PDKIM_HDR_TAG 1 | |
602 | #define PDKIM_HDR_VALUE 2 | |
3045f050 | 603 | |
f444c2c7 | 604 | static pdkim_signature * |
3045f050 JH |
605 | pdkim_parse_sig_header(pdkim_ctx *ctx, char *raw_hdr) |
606 | { | |
607 | pdkim_signature *sig ; | |
abe1010c | 608 | char *p, *q; |
3045f050 JH |
609 | pdkim_str *cur_tag = NULL; |
610 | pdkim_str *cur_val = NULL; | |
611 | BOOL past_hname = FALSE; | |
612 | BOOL in_b_val = FALSE; | |
613 | int where = PDKIM_HDR_LIMBO; | |
614 | int i; | |
615 | ||
616 | if (!(sig = malloc(sizeof(pdkim_signature)))) return NULL; | |
abe1010c | 617 | memset(sig, 0, sizeof(pdkim_signature)); |
3045f050 JH |
618 | sig->bodylength = -1; |
619 | ||
620 | if (!(sig->rawsig_no_b_val = malloc(strlen(raw_hdr)+1))) | |
621 | { | |
622 | free(sig); | |
623 | return NULL; | |
80a47a2c TK |
624 | } |
625 | ||
3045f050 | 626 | q = sig->rawsig_no_b_val; |
80a47a2c | 627 | |
3045f050 JH |
628 | for (p = raw_hdr; ; p++) |
629 | { | |
630 | char c = *p; | |
80a47a2c | 631 | |
3045f050 JH |
632 | /* Ignore FWS */ |
633 | if (c == '\r' || c == '\n') | |
634 | goto NEXT_CHAR; | |
80a47a2c | 635 | |
3045f050 JH |
636 | /* Fast-forward through header name */ |
637 | if (!past_hname) | |
638 | { | |
639 | if (c == ':') past_hname = TRUE; | |
640 | goto NEXT_CHAR; | |
80a47a2c TK |
641 | } |
642 | ||
3045f050 JH |
643 | if (where == PDKIM_HDR_LIMBO) |
644 | { | |
645 | /* In limbo, just wait for a tag-char to appear */ | |
646 | if (!(c >= 'a' && c <= 'z')) | |
647 | goto NEXT_CHAR; | |
80a47a2c | 648 | |
3045f050 | 649 | where = PDKIM_HDR_TAG; |
80a47a2c TK |
650 | } |
651 | ||
3045f050 JH |
652 | if (where == PDKIM_HDR_TAG) |
653 | { | |
654 | if (!cur_tag) | |
655 | cur_tag = pdkim_strnew(NULL); | |
80a47a2c | 656 | |
3045f050 JH |
657 | if (c >= 'a' && c <= 'z') |
658 | pdkim_strncat(cur_tag, p, 1); | |
80a47a2c | 659 | |
3045f050 JH |
660 | if (c == '=') |
661 | { | |
662 | if (strcmp(cur_tag->str, "b") == 0) | |
663 | { | |
664 | *q = '='; q++; | |
665 | in_b_val = TRUE; | |
666 | } | |
667 | where = PDKIM_HDR_VALUE; | |
668 | goto NEXT_CHAR; | |
80a47a2c TK |
669 | } |
670 | } | |
671 | ||
3045f050 JH |
672 | if (where == PDKIM_HDR_VALUE) |
673 | { | |
674 | if (!cur_val) | |
675 | cur_val = pdkim_strnew(NULL); | |
676 | ||
677 | if (c == '\r' || c == '\n' || c == ' ' || c == '\t') | |
678 | goto NEXT_CHAR; | |
679 | ||
680 | if (c == ';' || c == '\0') | |
681 | { | |
682 | if (cur_tag->len > 0) | |
683 | { | |
684 | pdkim_strtrim(cur_val); | |
685 | ||
0d04a285 | 686 | DEBUG(D_acl) debug_printf(" %s=%s\n", cur_tag->str, cur_val->str); |
3045f050 JH |
687 | |
688 | switch (cur_tag->str[0]) | |
689 | { | |
690 | case 'b': | |
691 | if (cur_tag->str[1] == 'h') | |
692 | sig->bodyhash = pdkim_decode_base64(cur_val->str, | |
693 | &sig->bodyhash_len); | |
694 | else | |
695 | sig->sigdata = pdkim_decode_base64(cur_val->str, | |
696 | &sig->sigdata_len); | |
697 | break; | |
698 | case 'v': | |
699 | /* We only support version 1, and that is currently the | |
700 | only version there is. */ | |
701 | if (strcmp(cur_val->str, PDKIM_SIGNATURE_VERSION) == 0) | |
702 | sig->version = 1; | |
703 | break; | |
704 | case 'a': | |
705 | for (i = 0; pdkim_algos[i]; i++) | |
706 | if (strcmp(cur_val->str, pdkim_algos[i]) == 0) | |
707 | { | |
708 | sig->algo = i; | |
709 | break; | |
710 | } | |
711 | break; | |
712 | case 'c': | |
713 | for (i = 0; pdkim_combined_canons[i].str; i++) | |
714 | if (strcmp(cur_val->str, pdkim_combined_canons[i].str) == 0) | |
715 | { | |
716 | sig->canon_headers = pdkim_combined_canons[i].canon_headers; | |
717 | sig->canon_body = pdkim_combined_canons[i].canon_body; | |
718 | break; | |
719 | } | |
720 | break; | |
721 | case 'q': | |
722 | for (i = 0; pdkim_querymethods[i]; i++) | |
723 | if (strcmp(cur_val->str, pdkim_querymethods[i]) == 0) | |
724 | { | |
725 | sig->querymethod = i; | |
726 | break; | |
727 | } | |
728 | break; | |
729 | case 's': | |
730 | sig->selector = strdup(cur_val->str); break; | |
731 | case 'd': | |
732 | sig->domain = strdup(cur_val->str); break; | |
733 | case 'i': | |
734 | sig->identity = pdkim_decode_qp(cur_val->str); break; | |
735 | case 't': | |
736 | sig->created = strtoul(cur_val->str, NULL, 10); break; | |
737 | case 'x': | |
738 | sig->expires = strtoul(cur_val->str, NULL, 10); break; | |
739 | case 'l': | |
740 | sig->bodylength = strtol(cur_val->str, NULL, 10); break; | |
741 | case 'h': | |
742 | sig->headernames = strdup(cur_val->str); break; | |
743 | case 'z': | |
744 | sig->copiedheaders = pdkim_decode_qp(cur_val->str); break; | |
745 | default: | |
0d04a285 | 746 | DEBUG(D_acl) debug_printf(" Unknown tag encountered\n"); |
3045f050 JH |
747 | break; |
748 | } | |
749 | } | |
750 | pdkim_strclear(cur_tag); | |
751 | pdkim_strclear(cur_val); | |
752 | in_b_val = FALSE; | |
753 | where = PDKIM_HDR_LIMBO; | |
80a47a2c | 754 | } |
3045f050 JH |
755 | else |
756 | pdkim_strncat(cur_val, p, 1); | |
80a47a2c TK |
757 | } |
758 | ||
3045f050 JH |
759 | NEXT_CHAR: |
760 | if (c == '\0') | |
761 | break; | |
80a47a2c | 762 | |
3045f050 JH |
763 | if (!in_b_val) |
764 | *q++ = c; | |
80a47a2c TK |
765 | } |
766 | ||
3045f050 JH |
767 | /* Make sure the most important bits are there. */ |
768 | if (!(sig->domain && (*(sig->domain) != '\0') && | |
769 | sig->selector && (*(sig->selector) != '\0') && | |
770 | sig->headernames && (*(sig->headernames) != '\0') && | |
771 | sig->bodyhash && | |
772 | sig->sigdata && | |
773 | sig->version)) | |
774 | { | |
775 | pdkim_free_sig(sig); | |
776 | return NULL; | |
80a47a2c TK |
777 | } |
778 | ||
3045f050 JH |
779 | *q = '\0'; |
780 | /* Chomp raw header. The final newline must not be added to the signature. */ | |
781 | q--; | |
782 | while (q > sig->rawsig_no_b_val && (*q == '\r' || *q == '\n')) | |
783 | *q = '\0'; q--; /*XXX questionable code layout; possible bug */ | |
80a47a2c | 784 | |
0d04a285 | 785 | DEBUG(D_acl) |
3045f050 | 786 | { |
0d04a285 | 787 | debug_printf( |
3045f050 | 788 | "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); |
0d04a285 JH |
789 | pdkim_quoteprint(sig->rawsig_no_b_val, strlen(sig->rawsig_no_b_val), 1); |
790 | debug_printf( | |
abe1010c | 791 | "PDKIM >> Sig size: %4d bits\n", sig->sigdata_len*8); |
0d04a285 | 792 | debug_printf( |
3045f050 | 793 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 794 | } |
80a47a2c | 795 | |
cb224393 | 796 | #ifdef SHA_OPENSSL |
80a47a2c | 797 | |
f444c2c7 JH |
798 | SHA1_Init (&sig->sha1_body); |
799 | SHA256_Init(&sig->sha2_body); | |
cb224393 JH |
800 | |
801 | #elif defined(SHA_GNUTLS) | |
802 | ||
803 | gnutls_hash_init(&sig->sha_body, | |
804 | sig->algo == PDKIM_ALGO_RSA_SHA1 ? GNUTLS_DIG_SHA1 : GNUTLS_DIG_SHA256); | |
805 | ||
806 | #elif defined(SHA_POLARSSL) | |
807 | ||
808 | if ( !(sig->sha1_body = malloc(sizeof(sha1_context))) | |
809 | || !(sig->sha2_body = malloc(sizeof(sha2_context))) | |
810 | ) | |
811 | { | |
812 | pdkim_free_sig(sig); | |
813 | return NULL; | |
814 | } | |
815 | ||
816 | sha1_starts(sig->sha1_body); | |
817 | sha2_starts(sig->sha2_body, 0); | |
818 | ||
819 | #endif /* SHA impl */ | |
80a47a2c | 820 | |
3045f050 | 821 | return sig; |
80a47a2c TK |
822 | } |
823 | ||
824 | ||
825 | /* -------------------------------------------------------------------------- */ | |
80a47a2c | 826 | |
f444c2c7 | 827 | static pdkim_pubkey * |
3045f050 JH |
828 | pdkim_parse_pubkey_record(pdkim_ctx *ctx, char *raw_record) |
829 | { | |
830 | pdkim_pubkey *pub; | |
831 | char *p; | |
832 | pdkim_str *cur_tag = NULL; | |
833 | pdkim_str *cur_val = NULL; | |
834 | int where = PDKIM_HDR_LIMBO; | |
80a47a2c | 835 | |
3045f050 | 836 | if (!(pub = malloc(sizeof(pdkim_pubkey)))) return NULL; |
abe1010c | 837 | memset(pub, 0, sizeof(pdkim_pubkey)); |
80a47a2c | 838 | |
3045f050 JH |
839 | for (p = raw_record; ; p++) |
840 | { | |
841 | char c = *p; | |
80a47a2c | 842 | |
3045f050 JH |
843 | /* Ignore FWS */ |
844 | if (c == '\r' || c == '\n') | |
845 | goto NEXT_CHAR; | |
80a47a2c | 846 | |
3045f050 JH |
847 | if (where == PDKIM_HDR_LIMBO) |
848 | { | |
849 | /* In limbo, just wait for a tag-char to appear */ | |
850 | if (!(c >= 'a' && c <= 'z')) | |
851 | goto NEXT_CHAR; | |
80a47a2c | 852 | |
3045f050 | 853 | where = PDKIM_HDR_TAG; |
80a47a2c TK |
854 | } |
855 | ||
3045f050 JH |
856 | if (where == PDKIM_HDR_TAG) |
857 | { | |
858 | if (!cur_tag) | |
859 | cur_tag = pdkim_strnew(NULL); | |
80a47a2c | 860 | |
3045f050 JH |
861 | if (c >= 'a' && c <= 'z') |
862 | pdkim_strncat(cur_tag, p, 1); | |
80a47a2c | 863 | |
3045f050 JH |
864 | if (c == '=') |
865 | { | |
866 | where = PDKIM_HDR_VALUE; | |
867 | goto NEXT_CHAR; | |
80a47a2c TK |
868 | } |
869 | } | |
870 | ||
3045f050 JH |
871 | if (where == PDKIM_HDR_VALUE) |
872 | { | |
873 | if (!cur_val) | |
874 | cur_val = pdkim_strnew(NULL); | |
875 | ||
876 | if (c == '\r' || c == '\n') | |
877 | goto NEXT_CHAR; | |
878 | ||
879 | if (c == ';' || c == '\0') | |
880 | { | |
881 | if (cur_tag->len > 0) | |
882 | { | |
883 | pdkim_strtrim(cur_val); | |
0d04a285 | 884 | DEBUG(D_acl) debug_printf(" %s=%s\n", cur_tag->str, cur_val->str); |
3045f050 JH |
885 | |
886 | switch (cur_tag->str[0]) | |
887 | { | |
888 | case 'v': | |
889 | /* This tag isn't evaluated because: | |
890 | - We only support version DKIM1. | |
891 | - Which is the default for this value (set below) | |
892 | - Other versions are currently not specified. */ | |
893 | break; | |
894 | case 'h': | |
895 | pub->hashes = strdup(cur_val->str); break; | |
896 | case 'g': | |
897 | pub->granularity = strdup(cur_val->str); break; | |
898 | case 'n': | |
899 | pub->notes = pdkim_decode_qp(cur_val->str); break; | |
900 | case 'p': | |
901 | pub->key = pdkim_decode_base64(cur_val->str, &(pub->key_len)); break; | |
902 | case 'k': | |
903 | pub->hashes = strdup(cur_val->str); break; | |
904 | case 's': | |
905 | pub->srvtype = strdup(cur_val->str); break; | |
906 | case 't': | |
abe1010c JH |
907 | if (strchr(cur_val->str, 'y') != NULL) pub->testing = 1; |
908 | if (strchr(cur_val->str, 's') != NULL) pub->no_subdomaining = 1; | |
3045f050 JH |
909 | break; |
910 | default: | |
0d04a285 | 911 | DEBUG(D_acl) debug_printf(" Unknown tag encountered\n"); |
3045f050 JH |
912 | break; |
913 | } | |
914 | } | |
915 | pdkim_strclear(cur_tag); | |
916 | pdkim_strclear(cur_val); | |
917 | where = PDKIM_HDR_LIMBO; | |
80a47a2c | 918 | } |
3045f050 JH |
919 | else |
920 | pdkim_strncat(cur_val, p, 1); | |
80a47a2c TK |
921 | } |
922 | ||
3045f050 JH |
923 | NEXT_CHAR: |
924 | if (c == '\0') break; | |
80a47a2c TK |
925 | } |
926 | ||
3045f050 JH |
927 | /* Set fallback defaults */ |
928 | if (!pub->version ) pub->version = strdup(PDKIM_PUB_RECORD_VERSION); | |
929 | if (!pub->granularity) pub->granularity = strdup("*"); | |
930 | if (!pub->keytype ) pub->keytype = strdup("rsa"); | |
931 | if (!pub->srvtype ) pub->srvtype = strdup("*"); | |
80a47a2c | 932 | |
3045f050 JH |
933 | /* p= is required */ |
934 | if (pub->key) | |
80a47a2c | 935 | return pub; |
3045f050 JH |
936 | |
937 | pdkim_free_pubkey(pub); | |
938 | return NULL; | |
80a47a2c TK |
939 | } |
940 | ||
941 | ||
942 | /* -------------------------------------------------------------------------- */ | |
3045f050 | 943 | |
f444c2c7 | 944 | static int |
3045f050 JH |
945 | pdkim_update_bodyhash(pdkim_ctx *ctx, const char *data, int len) |
946 | { | |
947 | pdkim_signature *sig = ctx->sig; | |
948 | /* Cache relaxed version of data */ | |
949 | char *relaxed_data = NULL; | |
950 | int relaxed_len = 0; | |
951 | ||
952 | /* Traverse all signatures, updating their hashes. */ | |
953 | while (sig) | |
954 | { | |
955 | /* Defaults to simple canon (no further treatment necessary) */ | |
956 | const char *canon_data = data; | |
957 | int canon_len = len; | |
958 | ||
959 | if (sig->canon_body == PDKIM_CANON_RELAXED) | |
960 | { | |
961 | /* Relax the line if not done already */ | |
962 | if (!relaxed_data) | |
963 | { | |
964 | BOOL seen_wsp = FALSE; | |
965 | const char *p; | |
966 | int q = 0; | |
967 | ||
968 | if (!(relaxed_data = malloc(len+1))) | |
969 | return PDKIM_ERR_OOM; | |
970 | ||
971 | for (p = data; *p; p++) | |
972 | { | |
973 | char c = *p; | |
974 | if (c == '\r') | |
975 | { | |
976 | if (q > 0 && relaxed_data[q-1] == ' ') | |
977 | q--; | |
978 | } | |
979 | else if (c == '\t' || c == ' ') | |
980 | { | |
981 | c = ' '; /* Turns WSP into SP */ | |
982 | if (seen_wsp) | |
983 | continue; | |
984 | seen_wsp = TRUE; | |
985 | } | |
986 | else | |
987 | seen_wsp = FALSE; | |
988 | relaxed_data[q++] = c; | |
989 | } | |
990 | relaxed_data[q] = '\0'; | |
991 | relaxed_len = q; | |
80a47a2c | 992 | } |
3045f050 JH |
993 | canon_data = relaxed_data; |
994 | canon_len = relaxed_len; | |
80a47a2c TK |
995 | } |
996 | ||
3045f050 JH |
997 | /* Make sure we don't exceed the to-be-signed body length */ |
998 | if ( sig->bodylength >= 0 | |
999 | && sig->signed_body_bytes + (unsigned long)canon_len > sig->bodylength | |
1000 | ) | |
1001 | canon_len = sig->bodylength - sig->signed_body_bytes; | |
80a47a2c | 1002 | |
3045f050 JH |
1003 | if (canon_len > 0) |
1004 | { | |
cb224393 | 1005 | #ifdef SHA_GNUTLS |
f444c2c7 JH |
1006 | gnutls_hash(sig->sha_body, canon_data, canon_len); |
1007 | #else | |
3045f050 | 1008 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) |
cb224393 | 1009 | # ifdef SHA_OPENSSL |
f444c2c7 | 1010 | SHA1_Update (&sig->sha1_body, canon_data, canon_len); |
3045f050 | 1011 | else |
f444c2c7 | 1012 | SHA256_Update(&sig->sha2_body, canon_data, canon_len); |
cb224393 JH |
1013 | # elif defined(SHA_POLARSSL) |
1014 | sha1_update(sig->sha1_body, US canon_data, canon_len); | |
1015 | else | |
1016 | sha2_update(sig->sha2_body, US canon_data, canon_len); | |
1017 | # endif | |
f444c2c7 | 1018 | #endif |
3045f050 JH |
1019 | |
1020 | sig->signed_body_bytes += canon_len; | |
0d04a285 | 1021 | DEBUG(D_acl) pdkim_quoteprint(canon_data, canon_len, 1); |
80a47a2c TK |
1022 | } |
1023 | ||
3045f050 | 1024 | sig = sig->next; |
80a47a2c TK |
1025 | } |
1026 | ||
3045f050 JH |
1027 | if (relaxed_data) free(relaxed_data); |
1028 | return PDKIM_OK; | |
6ab02e3f | 1029 | } |
80a47a2c TK |
1030 | |
1031 | ||
1032 | /* -------------------------------------------------------------------------- */ | |
80a47a2c | 1033 | |
f444c2c7 | 1034 | static int |
3045f050 JH |
1035 | pdkim_finish_bodyhash(pdkim_ctx *ctx) |
1036 | { | |
f4d091fb | 1037 | pdkim_signature *sig; |
80a47a2c | 1038 | |
3045f050 | 1039 | /* Traverse all signatures */ |
f4d091fb | 1040 | for (sig = ctx->sig; sig; sig = sig->next) |
3045f050 | 1041 | { /* Finish hashes */ |
f444c2c7 | 1042 | uschar bh[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */ |
3045f050 | 1043 | |
cb224393 | 1044 | #ifdef SHA_GNUTLS |
f444c2c7 JH |
1045 | gnutls_hash_output(sig->sha_body, bh); |
1046 | #else | |
3045f050 | 1047 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) |
cb224393 | 1048 | # ifdef SHA_OPENSSL |
f444c2c7 | 1049 | SHA1_Final (bh, &sig->sha1_body); |
3045f050 | 1050 | else |
f444c2c7 | 1051 | SHA256_Final(bh, &sig->sha2_body); |
cb224393 JH |
1052 | # elif defined(SHA_POLARSSL) |
1053 | sha1_finish(sig->sha1_body, bh); | |
1054 | else | |
1055 | sha2_finish(sig->sha2_body, bh); | |
1056 | # endif | |
f444c2c7 | 1057 | #endif |
3045f050 | 1058 | |
0d04a285 | 1059 | DEBUG(D_acl) |
3045f050 | 1060 | { |
0d04a285 JH |
1061 | debug_printf("PDKIM [%s] Body bytes hashed: %lu\n" |
1062 | "PDKIM [%s] bh computed: ", | |
1063 | sig->domain, sig->signed_body_bytes, sig->domain); | |
1064 | pdkim_hexprint((char *)bh, sig->algo == PDKIM_ALGO_RSA_SHA1 ? 20 : 32, 1); | |
80a47a2c | 1065 | } |
3045f050 JH |
1066 | |
1067 | /* SIGNING -------------------------------------------------------------- */ | |
1068 | if (ctx->mode == PDKIM_MODE_SIGN) | |
1069 | { | |
f444c2c7 | 1070 | sig->bodyhash_len = sig->algo == PDKIM_ALGO_RSA_SHA1 ? 20:32; |
3c51463e | 1071 | sig->bodyhash = CS string_copyn(US bh, sig->bodyhash_len); |
3045f050 JH |
1072 | |
1073 | /* If bodylength limit is set, and we have received less bytes | |
1074 | than the requested amount, effectively remove the limit tag. */ | |
1075 | if (sig->signed_body_bytes < sig->bodylength) | |
1076 | sig->bodylength = -1; | |
80a47a2c | 1077 | } |
3045f050 JH |
1078 | |
1079 | /* VERIFICATION --------------------------------------------------------- */ | |
1080 | else | |
1081 | { | |
1082 | /* Compare bodyhash */ | |
1083 | if (memcmp(bh, sig->bodyhash, | |
1084 | (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32) == 0) | |
1085 | { | |
0d04a285 | 1086 | DEBUG(D_acl) debug_printf("PDKIM [%s] Body hash verified OK\n", sig->domain); |
80a47a2c | 1087 | } |
3045f050 JH |
1088 | else |
1089 | { | |
0d04a285 | 1090 | DEBUG(D_acl) |
3045f050 | 1091 | { |
0d04a285 JH |
1092 | debug_printf("PDKIM [%s] bh signature: ", sig->domain); |
1093 | pdkim_hexprint(sig->bodyhash, | |
1094 | sig->algo == PDKIM_ALGO_RSA_SHA1 ? 20 : 32, 1); | |
1095 | debug_printf("PDKIM [%s] Body hash did NOT verify\n", sig->domain); | |
3045f050 | 1096 | } |
3045f050 JH |
1097 | sig->verify_status = PDKIM_VERIFY_FAIL; |
1098 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY; | |
80a47a2c TK |
1099 | } |
1100 | } | |
80a47a2c TK |
1101 | } |
1102 | ||
3045f050 | 1103 | return PDKIM_OK; |
6ab02e3f | 1104 | } |
80a47a2c TK |
1105 | |
1106 | ||
1107 | ||
1108 | /* -------------------------------------------------------------------------- */ | |
1109 | /* Callback from pdkim_feed below for processing complete body lines */ | |
3045f050 | 1110 | |
0d04a285 | 1111 | static int |
3045f050 JH |
1112 | pdkim_bodyline_complete(pdkim_ctx *ctx) |
1113 | { | |
1114 | char *p = ctx->linebuf; | |
1115 | int n = ctx->linebuf_offset; | |
c14470c3 | 1116 | pdkim_signature *sig = ctx->sig; /*XXX assumes only one sig */ |
3045f050 JH |
1117 | |
1118 | /* Ignore extra data if we've seen the end-of-data marker */ | |
1119 | if (ctx->seen_eod) goto BAIL; | |
1120 | ||
1121 | /* We've always got one extra byte to stuff a zero ... */ | |
0d04a285 | 1122 | ctx->linebuf[ctx->linebuf_offset] = '\0'; |
3045f050 | 1123 | |
0d04a285 JH |
1124 | /* Terminate on EOD marker */ |
1125 | if (memcmp(p, ".\r\n", 3) == 0) | |
3045f050 | 1126 | { |
0d04a285 JH |
1127 | /* In simple body mode, if any empty lines were buffered, |
1128 | replace with one. rfc 4871 3.4.3 */ | |
1129 | /*XXX checking the signed-body-bytes is a gross hack; I think | |
1130 | it indicates that all linebreaks should be buffered, including | |
1131 | the one terminating a text line */ | |
1132 | if ( sig && sig->canon_body == PDKIM_CANON_SIMPLE | |
1133 | && sig->signed_body_bytes == 0 | |
1134 | && ctx->num_buffered_crlf > 0 | |
1135 | ) | |
1136 | pdkim_update_bodyhash(ctx, "\r\n", 2); | |
1137 | ||
1138 | ctx->seen_eod = TRUE; | |
1139 | goto BAIL; | |
1140 | } | |
1141 | /* Unstuff dots */ | |
1142 | if (memcmp(p, "..", 2) == 0) | |
1143 | { | |
1144 | p++; | |
1145 | n--; | |
80a47a2c TK |
1146 | } |
1147 | ||
3045f050 JH |
1148 | /* Empty lines need to be buffered until we find a non-empty line */ |
1149 | if (memcmp(p, "\r\n", 2) == 0) | |
1150 | { | |
1151 | ctx->num_buffered_crlf++; | |
1152 | goto BAIL; | |
80a47a2c TK |
1153 | } |
1154 | ||
c14470c3 | 1155 | if (sig && sig->canon_body == PDKIM_CANON_RELAXED) |
3045f050 JH |
1156 | { |
1157 | /* Lines with just spaces need to be buffered too */ | |
1158 | char *check = p; | |
1159 | while (memcmp(check, "\r\n", 2) != 0) | |
1160 | { | |
1161 | char c = *check; | |
6a11a9e6 | 1162 | |
3045f050 JH |
1163 | if (c != '\t' && c != ' ') |
1164 | goto PROCESS; | |
1165 | check++; | |
6a11a9e6 JH |
1166 | } |
1167 | ||
3045f050 JH |
1168 | ctx->num_buffered_crlf++; |
1169 | goto BAIL; | |
1170 | } | |
6a11a9e6 | 1171 | |
3045f050 JH |
1172 | PROCESS: |
1173 | /* At this point, we have a non-empty line, so release the buffered ones. */ | |
1174 | while (ctx->num_buffered_crlf) | |
1175 | { | |
1176 | pdkim_update_bodyhash(ctx, "\r\n", 2); | |
1177 | ctx->num_buffered_crlf--; | |
80a47a2c TK |
1178 | } |
1179 | ||
3045f050 | 1180 | pdkim_update_bodyhash(ctx, p, n); |
80a47a2c | 1181 | |
3045f050 JH |
1182 | BAIL: |
1183 | ctx->linebuf_offset = 0; | |
1184 | return PDKIM_OK; | |
80a47a2c TK |
1185 | } |
1186 | ||
1187 | ||
1188 | /* -------------------------------------------------------------------------- */ | |
1189 | /* Callback from pdkim_feed below for processing complete headers */ | |
1190 | #define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:" | |
3045f050 | 1191 | |
f444c2c7 | 1192 | static int |
3045f050 JH |
1193 | pdkim_header_complete(pdkim_ctx *ctx) |
1194 | { | |
3045f050 JH |
1195 | /* Special case: The last header can have an extra \r appended */ |
1196 | if ( (ctx->cur_header->len > 1) && | |
1197 | (ctx->cur_header->str[(ctx->cur_header->len)-1] == '\r') ) | |
1198 | { | |
1199 | ctx->cur_header->str[(ctx->cur_header->len)-1] = '\0'; | |
1200 | ctx->cur_header->len--; | |
80a47a2c TK |
1201 | } |
1202 | ||
3045f050 JH |
1203 | ctx->num_headers++; |
1204 | if (ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL; | |
80a47a2c | 1205 | |
3045f050 JH |
1206 | /* SIGNING -------------------------------------------------------------- */ |
1207 | if (ctx->mode == PDKIM_MODE_SIGN) | |
0d04a285 JH |
1208 | { |
1209 | pdkim_signature *sig; | |
1210 | ||
1211 | for (sig = ctx->sig; sig; sig = sig->next) /* Traverse all signatures */ | |
3045f050 JH |
1212 | if (header_name_match(ctx->cur_header->str, |
1213 | sig->sign_headers? | |
1214 | sig->sign_headers: | |
1215 | PDKIM_DEFAULT_SIGN_HEADERS, 0) == PDKIM_OK) | |
1216 | { | |
37f8b554 | 1217 | pdkim_stringlist *list; |
80a47a2c | 1218 | |
37f8b554 | 1219 | /* Add header to the signed headers list (in reverse order) */ |
3045f050 JH |
1220 | if (!(list = pdkim_prepend_stringlist(sig->headers, |
1221 | ctx->cur_header->str))) | |
1222 | return PDKIM_ERR_OOM; | |
37f8b554 | 1223 | sig->headers = list; |
3045f050 | 1224 | } |
0d04a285 | 1225 | } |
94431adb | 1226 | |
0d04a285 | 1227 | /* VERIFICATION ----------------------------------------------------------- */ |
3045f050 JH |
1228 | /* DKIM-Signature: headers are added to the verification list */ |
1229 | if (ctx->mode == PDKIM_MODE_VERIFY) | |
1230 | { | |
1231 | if (strncasecmp(ctx->cur_header->str, | |
1232 | DKIM_SIGNATURE_HEADERNAME, | |
1233 | strlen(DKIM_SIGNATURE_HEADERNAME)) == 0) | |
1234 | { | |
1235 | pdkim_signature *new_sig; | |
80a47a2c | 1236 | |
3045f050 | 1237 | /* Create and chain new signature block */ |
0d04a285 | 1238 | DEBUG(D_acl) debug_printf( |
3045f050 | 1239 | "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); |
3045f050 JH |
1240 | |
1241 | if ((new_sig = pdkim_parse_sig_header(ctx, ctx->cur_header->str))) | |
1242 | { | |
1243 | pdkim_signature *last_sig = ctx->sig; | |
1244 | if (!last_sig) | |
1245 | ctx->sig = new_sig; | |
1246 | else | |
1247 | { | |
1248 | while (last_sig->next) last_sig = last_sig->next; | |
1249 | last_sig->next = new_sig; | |
1250 | } | |
80a47a2c | 1251 | } |
abe1010c | 1252 | else |
0d04a285 JH |
1253 | DEBUG(D_acl) debug_printf( |
1254 | "Error while parsing signature header\n" | |
3045f050 | 1255 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 1256 | } |
37f8b554 | 1257 | |
3045f050 JH |
1258 | /* every other header is stored for signature verification */ |
1259 | else | |
1260 | { | |
1261 | pdkim_stringlist *list; | |
1262 | ||
abe1010c | 1263 | if (!(list = pdkim_prepend_stringlist(ctx->headers, ctx->cur_header->str))) |
3045f050 JH |
1264 | return PDKIM_ERR_OOM; |
1265 | ctx->headers = list; | |
80a47a2c TK |
1266 | } |
1267 | } | |
1268 | ||
3045f050 JH |
1269 | BAIL: |
1270 | pdkim_strclear(ctx->cur_header); /* Re-use existing pdkim_str */ | |
1271 | return PDKIM_OK; | |
6ab02e3f | 1272 | } |
80a47a2c TK |
1273 | |
1274 | ||
1275 | ||
1276 | /* -------------------------------------------------------------------------- */ | |
1277 | #define HEADER_BUFFER_FRAG_SIZE 256 | |
3045f050 JH |
1278 | |
1279 | DLLEXPORT int | |
1280 | pdkim_feed (pdkim_ctx *ctx, char *data, int len) | |
1281 | { | |
1282 | int p; | |
1283 | ||
1284 | for (p = 0; p<len; p++) | |
1285 | { | |
1286 | char c = data[p]; | |
1287 | ||
1288 | if (ctx->past_headers) | |
1289 | { | |
1290 | /* Processing body byte */ | |
0d04a285 | 1291 | ctx->linebuf[ctx->linebuf_offset++] = c; |
3045f050 JH |
1292 | if (c == '\n') |
1293 | { | |
1294 | int rc = pdkim_bodyline_complete(ctx); /* End of line */ | |
1295 | if (rc != PDKIM_OK) return rc; | |
80a47a2c | 1296 | } |
3045f050 JH |
1297 | if (ctx->linebuf_offset == (PDKIM_MAX_BODY_LINE_LEN-1)) |
1298 | return PDKIM_ERR_LONG_LINE; | |
80a47a2c | 1299 | } |
3045f050 JH |
1300 | else |
1301 | { | |
1302 | /* Processing header byte */ | |
1303 | if (c != '\r') | |
1304 | { | |
1305 | if (c == '\n') | |
1306 | { | |
1307 | if (ctx->seen_lf) | |
1308 | { | |
1309 | int rc = pdkim_header_complete(ctx); /* Seen last header line */ | |
1310 | if (rc != PDKIM_OK) return rc; | |
1311 | ||
0d04a285 | 1312 | ctx->past_headers = TRUE; |
3045f050 | 1313 | ctx->seen_lf = 0; |
0d04a285 | 1314 | DEBUG(D_acl) debug_printf( |
3045f050 | 1315 | "PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); |
3045f050 JH |
1316 | continue; |
1317 | } | |
1318 | else | |
0d04a285 | 1319 | ctx->seen_lf = TRUE; |
3045f050 JH |
1320 | } |
1321 | else if (ctx->seen_lf) | |
1322 | { | |
1323 | if (!(c == '\t' || c == ' ')) | |
1324 | { | |
1325 | int rc = pdkim_header_complete(ctx); /* End of header */ | |
1326 | if (rc != PDKIM_OK) return rc; | |
1327 | } | |
0d04a285 | 1328 | ctx->seen_lf = FALSE; |
3045f050 | 1329 | } |
80a47a2c | 1330 | } |
3045f050 JH |
1331 | |
1332 | if (!ctx->cur_header) | |
1333 | if (!(ctx->cur_header = pdkim_strnew(NULL))) | |
1334 | return PDKIM_ERR_OOM; | |
1335 | ||
1336 | if (ctx->cur_header->len < PDKIM_MAX_HEADER_LEN) | |
1337 | if (!pdkim_strncat(ctx->cur_header, &data[p], 1)) | |
1338 | return PDKIM_ERR_OOM; | |
80a47a2c TK |
1339 | } |
1340 | } | |
3045f050 | 1341 | return PDKIM_OK; |
6ab02e3f | 1342 | } |
80a47a2c | 1343 | |
05b7d6de JB |
1344 | /* |
1345 | * RFC 5322 specifies that header line length SHOULD be no more than 78 | |
1346 | * lets make it so! | |
1347 | * pdkim_headcat | |
1348 | * returns char* | |
1349 | * | |
1350 | * col: this int holds and receives column number (octets since last '\n') | |
1351 | * str: partial string to append to | |
94431adb | 1352 | * pad: padding, split line or space after before or after eg: ";" |
05b7d6de JB |
1353 | * intro: - must join to payload eg "h=", usually the tag name |
1354 | * payload: eg base64 data - long data can be split arbitrarily. | |
1355 | * | |
1356 | * this code doesn't fold the header in some of the places that RFC4871 | |
1357 | * allows: As per RFC5322(2.2.3) it only folds before or after tag-value | |
1358 | * pairs and inside long values. it also always spaces or breaks after the | |
94431adb | 1359 | * "pad" |
05b7d6de JB |
1360 | * |
1361 | * no guarantees are made for output given out-of range input. like tag | |
f444c2c7 | 1362 | * names longer than 78, or bogus col. Input is assumed to be free of line breaks. |
05b7d6de JB |
1363 | */ |
1364 | ||
3045f050 JH |
1365 | static char * |
1366 | pdkim_headcat(int *col, pdkim_str *str, const char * pad, | |
1367 | const char *intro, const char *payload) | |
1368 | { | |
1369 | size_t l; | |
1370 | ||
1371 | if (pad) | |
05b7d6de | 1372 | { |
3045f050 JH |
1373 | l = strlen(pad); |
1374 | if (*col + l > 78) | |
05b7d6de | 1375 | { |
3045f050 JH |
1376 | pdkim_strcat(str, "\r\n\t"); |
1377 | *col = 1; | |
05b7d6de | 1378 | } |
3045f050 JH |
1379 | pdkim_strncat(str, pad, l); |
1380 | *col += l; | |
05b7d6de JB |
1381 | } |
1382 | ||
3045f050 | 1383 | l = (pad?1:0) + (intro?strlen(intro):0); |
05b7d6de | 1384 | |
3045f050 | 1385 | if (*col + l > 78) |
05b7d6de | 1386 | { /*can't fit intro - start a new line to make room.*/ |
3045f050 JH |
1387 | pdkim_strcat(str, "\r\n\t"); |
1388 | *col = 1; | |
1389 | l = intro?strlen(intro):0; | |
05b7d6de JB |
1390 | } |
1391 | ||
3045f050 | 1392 | l += payload ? strlen(payload):0 ; |
05b7d6de | 1393 | |
3045f050 | 1394 | while (l>77) |
05b7d6de | 1395 | { /* this fragment will not fit on a single line */ |
3045f050 | 1396 | if (pad) |
05b7d6de | 1397 | { |
3045f050 JH |
1398 | pdkim_strcat(str, " "); |
1399 | *col += 1; | |
1400 | pad = NULL; /* only want this once */ | |
1401 | l--; | |
05b7d6de | 1402 | } |
3045f050 JH |
1403 | |
1404 | if (intro) | |
05b7d6de | 1405 | { |
3045f050 JH |
1406 | size_t sl = strlen(intro); |
1407 | ||
abe1010c | 1408 | pdkim_strncat(str, intro, sl); |
3045f050 JH |
1409 | *col += sl; |
1410 | l -= sl; | |
1411 | intro = NULL; /* only want this once */ | |
05b7d6de | 1412 | } |
3045f050 JH |
1413 | |
1414 | if (payload) | |
05b7d6de | 1415 | { |
3045f050 JH |
1416 | size_t sl = strlen(payload); |
1417 | size_t chomp = *col+sl < 77 ? sl : 78-*col; | |
1418 | ||
abe1010c | 1419 | pdkim_strncat(str, payload, chomp); |
3045f050 JH |
1420 | *col += chomp; |
1421 | payload += chomp; | |
1422 | l -= chomp-1; | |
05b7d6de | 1423 | } |
3045f050 JH |
1424 | |
1425 | /* the while precondition tells us it didn't fit. */ | |
1426 | pdkim_strcat(str, "\r\n\t"); | |
1427 | *col = 1; | |
05b7d6de | 1428 | } |
3045f050 JH |
1429 | |
1430 | if (*col + l > 78) | |
05b7d6de | 1431 | { |
3045f050 JH |
1432 | pdkim_strcat(str, "\r\n\t"); |
1433 | *col = 1; | |
1434 | pad = NULL; | |
05b7d6de JB |
1435 | } |
1436 | ||
3045f050 | 1437 | if (pad) |
05b7d6de | 1438 | { |
3045f050 JH |
1439 | pdkim_strcat(str, " "); |
1440 | *col += 1; | |
1441 | pad = NULL; | |
05b7d6de JB |
1442 | } |
1443 | ||
3045f050 | 1444 | if (intro) |
05b7d6de | 1445 | { |
3045f050 JH |
1446 | size_t sl = strlen(intro); |
1447 | ||
1448 | pdkim_strncat(str, intro, sl); | |
1449 | *col += sl; | |
1450 | l -= sl; | |
1451 | intro = NULL; | |
05b7d6de | 1452 | } |
3045f050 JH |
1453 | |
1454 | if (payload) | |
05b7d6de | 1455 | { |
3045f050 JH |
1456 | size_t sl = strlen(payload); |
1457 | ||
1458 | pdkim_strncat(str, payload, sl); | |
1459 | *col += sl; | |
05b7d6de JB |
1460 | } |
1461 | ||
3045f050 | 1462 | return str->str; |
05b7d6de | 1463 | } |
80a47a2c | 1464 | |
3045f050 | 1465 | |
80a47a2c | 1466 | /* -------------------------------------------------------------------------- */ |
3045f050 | 1467 | |
f444c2c7 | 1468 | static char * |
3045f050 JH |
1469 | pdkim_create_header(pdkim_signature *sig, int final) |
1470 | { | |
1471 | char *rc = NULL; | |
1472 | char *base64_bh = NULL; | |
1473 | char *base64_b = NULL; | |
1474 | int col = 0; | |
1475 | pdkim_str *hdr; | |
1476 | pdkim_str *canon_all; | |
1477 | ||
1478 | if (!(hdr = pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION))) | |
1479 | return NULL; | |
1480 | ||
1481 | if (!(canon_all = pdkim_strnew(pdkim_canons[sig->canon_headers]))) | |
1482 | goto BAIL; | |
1483 | ||
1484 | if (!(base64_bh = pdkim_encode_base64(sig->bodyhash, sig->bodyhash_len))) | |
1485 | goto BAIL; | |
1486 | ||
1487 | col = strlen(hdr->str); | |
1488 | ||
1489 | /* Required and static bits */ | |
abe1010c JH |
1490 | if ( pdkim_headcat(&col, hdr, ";", "a=", pdkim_algos[sig->algo]) |
1491 | && pdkim_headcat(&col, hdr, ";", "q=", pdkim_querymethods[sig->querymethod]) | |
1492 | && pdkim_strcat(canon_all, "/") | |
1493 | && pdkim_strcat(canon_all, pdkim_canons[sig->canon_body]) | |
1494 | && pdkim_headcat(&col, hdr, ";", "c=", canon_all->str) | |
1495 | && pdkim_headcat(&col, hdr, ";", "d=", sig->domain) | |
1496 | && pdkim_headcat(&col, hdr, ";", "s=", sig->selector) | |
3045f050 JH |
1497 | ) |
1498 | { | |
1499 | /* list of eader names can be split between items. */ | |
05b7d6de | 1500 | { |
3045f050 JH |
1501 | char *n = strdup(sig->headernames); |
1502 | char *f = n; | |
1503 | char *i = "h="; | |
1504 | char *s = ";"; | |
1505 | ||
1506 | if (!n) goto BAIL; | |
1507 | while (*n) | |
05b7d6de | 1508 | { |
abe1010c | 1509 | char *c = strchr(n, ':'); |
05b7d6de | 1510 | |
3045f050 | 1511 | if (c) *c ='\0'; |
05b7d6de | 1512 | |
3045f050 | 1513 | if (!i) |
abe1010c | 1514 | if (!pdkim_headcat(&col, hdr, NULL, NULL, ":")) |
3045f050 JH |
1515 | { |
1516 | free(f); | |
1517 | goto BAIL; | |
1518 | } | |
1519 | ||
abe1010c | 1520 | if (!pdkim_headcat(&col, hdr, s, i, n)) |
3045f050 JH |
1521 | { |
1522 | free(f); | |
1523 | goto BAIL; | |
1524 | } | |
1525 | ||
1526 | if (!c) | |
1527 | break; | |
1528 | ||
1529 | n = c+1; | |
1530 | s = NULL; | |
1531 | i = NULL; | |
80a47a2c | 1532 | } |
3045f050 | 1533 | free(f); |
80a47a2c | 1534 | } |
05b7d6de | 1535 | |
3045f050 JH |
1536 | if(!pdkim_headcat(&col, hdr, ";", "bh=", base64_bh)) |
1537 | goto BAIL; | |
1538 | ||
1539 | /* Optional bits */ | |
1540 | if (sig->identity) | |
1541 | if(!pdkim_headcat(&col, hdr, ";", "i=", sig->identity)) | |
1542 | goto BAIL; | |
1543 | ||
1544 | if (sig->created > 0) | |
1545 | { | |
1546 | char minibuf[20]; | |
1547 | ||
abe1010c | 1548 | snprintf(minibuf, 20, "%lu", sig->created); |
3045f050 JH |
1549 | if(!pdkim_headcat(&col, hdr, ";", "t=", minibuf)) |
1550 | goto BAIL; | |
1551 | } | |
1552 | ||
1553 | if (sig->expires > 0) | |
1554 | { | |
1555 | char minibuf[20]; | |
1556 | ||
abe1010c | 1557 | snprintf(minibuf, 20, "%lu", sig->expires); |
3045f050 JH |
1558 | if(!pdkim_headcat(&col, hdr, ";", "x=", minibuf)) |
1559 | goto BAIL; | |
80a47a2c | 1560 | } |
3045f050 JH |
1561 | |
1562 | if (sig->bodylength >= 0) | |
1563 | { | |
1564 | char minibuf[20]; | |
1565 | ||
abe1010c | 1566 | snprintf(minibuf, 20, "%lu", sig->bodylength); |
3045f050 JH |
1567 | if(!pdkim_headcat(&col, hdr, ";", "l=", minibuf)) |
1568 | goto BAIL; | |
80a47a2c TK |
1569 | } |
1570 | ||
3045f050 JH |
1571 | /* Preliminary or final version? */ |
1572 | if (final) | |
1573 | { | |
1574 | if (!(base64_b = pdkim_encode_base64(sig->sigdata, sig->sigdata_len))) | |
1575 | goto BAIL; | |
1576 | if (!pdkim_headcat(&col, hdr, ";", "b=", base64_b)) | |
1577 | goto BAIL; | |
1578 | } | |
1579 | else | |
1580 | if(!pdkim_headcat(&col, hdr, ";", "b=", "")) | |
1581 | goto BAIL; | |
05b7d6de | 1582 | |
3045f050 | 1583 | /* add trailing semicolon: I'm not sure if this is actually needed */ |
abe1010c | 1584 | if (!pdkim_headcat(&col, hdr, NULL, ";", "")) |
3045f050 | 1585 | goto BAIL; |
80a47a2c TK |
1586 | } |
1587 | ||
3045f050 | 1588 | rc = strdup(hdr->str); |
80a47a2c | 1589 | |
3045f050 JH |
1590 | BAIL: |
1591 | pdkim_strfree(hdr); | |
1592 | if (canon_all) pdkim_strfree(canon_all); | |
3045f050 | 1593 | return rc; |
80a47a2c TK |
1594 | } |
1595 | ||
1596 | ||
1597 | /* -------------------------------------------------------------------------- */ | |
3045f050 JH |
1598 | |
1599 | DLLEXPORT int | |
1600 | pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatures) | |
1601 | { | |
1602 | pdkim_signature *sig = ctx->sig; | |
1603 | pdkim_str *headernames = NULL; /* Collected signed header names */ | |
1604 | ||
1605 | /* Check if we must still flush a (partial) header. If that is the | |
1606 | case, the message has no body, and we must compute a body hash | |
1607 | out of '<CR><LF>' */ | |
1608 | if (ctx->cur_header && ctx->cur_header->len) | |
1609 | { | |
1610 | int rc = pdkim_header_complete(ctx); | |
1611 | if (rc != PDKIM_OK) return rc; | |
1612 | pdkim_update_bodyhash(ctx, "\r\n", 2); | |
80a47a2c | 1613 | } |
3045f050 | 1614 | else |
0d04a285 | 1615 | DEBUG(D_acl) debug_printf( |
3045f050 | 1616 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 1617 | |
3045f050 JH |
1618 | /* Build (and/or evaluate) body hash */ |
1619 | if (pdkim_finish_bodyhash(ctx) != PDKIM_OK) | |
1620 | return PDKIM_ERR_OOM; | |
80a47a2c | 1621 | |
3045f050 JH |
1622 | /* SIGNING -------------------------------------------------------------- */ |
1623 | if (ctx->mode == PDKIM_MODE_SIGN) | |
1624 | if (!(headernames = pdkim_strnew(NULL))) | |
1625 | return PDKIM_ERR_OOM; | |
1626 | /* ---------------------------------------------------------------------- */ | |
80a47a2c | 1627 | |
3045f050 JH |
1628 | while (sig) |
1629 | { | |
cb224393 | 1630 | #ifdef SHA_OPENSSL |
f444c2c7 JH |
1631 | SHA_CTX sha1_headers; |
1632 | SHA256_CTX sha2_headers; | |
cb224393 JH |
1633 | #elif defined(SHA_GNUTLS) |
1634 | gnutls_hash_hd_t sha_headers; | |
1635 | #elif defined(SHA_POLARSSL) | |
1636 | sha1_context sha1_headers; | |
1637 | sha2_context sha2_headers; | |
f444c2c7 | 1638 | #endif |
cb224393 | 1639 | |
3045f050 JH |
1640 | char *sig_hdr; |
1641 | char headerhash[32]; | |
80a47a2c | 1642 | |
cb224393 JH |
1643 | #ifdef RSA_GNUTLS |
1644 | uschar * hdata = NULL; | |
1645 | int hdata_alloc = 0; | |
1646 | int hdata_size = 0; | |
1647 | #endif | |
1648 | ||
1649 | #ifdef SHA_GNUTLS | |
f444c2c7 JH |
1650 | gnutls_hash_init(&sha_headers, |
1651 | sig->algo == PDKIM_ALGO_RSA_SHA1 ? GNUTLS_DIG_SHA1 : GNUTLS_DIG_SHA256); | |
1652 | #else | |
3045f050 | 1653 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) |
cb224393 | 1654 | # ifdef SHA_OPENSSL |
f444c2c7 | 1655 | SHA1_Init(&sha1_headers); |
3045f050 | 1656 | else |
f444c2c7 | 1657 | SHA256_Init(&sha2_headers); |
cb224393 JH |
1658 | # elif defined(SHA_POLARSSL) |
1659 | sha1_starts(&sha1_headers); | |
1660 | else | |
1661 | sha2_starts(&sha2_headers, 0); | |
1662 | # endif | |
f444c2c7 | 1663 | #endif |
80a47a2c | 1664 | |
0d04a285 JH |
1665 | DEBUG(D_acl) debug_printf( |
1666 | "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n"); | |
3045f050 JH |
1667 | |
1668 | /* SIGNING ---------------------------------------------------------------- */ | |
1669 | /* When signing, walk through our header list and add them to the hash. As we | |
1670 | go, construct a list of the header's names to use for the h= parameter. */ | |
1671 | ||
1672 | if (ctx->mode == PDKIM_MODE_SIGN) | |
1673 | { | |
1674 | pdkim_stringlist *p; | |
1675 | ||
1676 | for (p = sig->headers; p; p = p->next) | |
1677 | { | |
1678 | char *rh = NULL; | |
1679 | /* Collect header names (Note: colon presence is guaranteed here) */ | |
abe1010c | 1680 | char *q = strchr(p->value, ':'); |
3045f050 JH |
1681 | |
1682 | if (!(pdkim_strncat(headernames, p->value, | |
1683 | (q-(p->value)) + (p->next ? 1 : 0)))) | |
1684 | return PDKIM_ERR_OOM; | |
1685 | ||
1686 | rh = sig->canon_headers == PDKIM_CANON_RELAXED | |
abe1010c | 1687 | ? pdkim_relax_header(p->value, 1) /* cook header for relaxed canon */ |
3045f050 JH |
1688 | : strdup(p->value); /* just copy it for simple canon */ |
1689 | if (!rh) | |
1690 | return PDKIM_ERR_OOM; | |
1691 | ||
1692 | /* Feed header to the hash algorithm */ | |
cb224393 | 1693 | #ifdef SHA_GNUTLS |
f444c2c7 JH |
1694 | gnutls_hash(sha_headers, rh, strlen(rh)); |
1695 | #else | |
3045f050 | 1696 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) |
cb224393 | 1697 | # ifdef SHA_OPENSSL |
f444c2c7 | 1698 | SHA1_Update (&sha1_headers, rh, strlen(rh)); |
3045f050 | 1699 | else |
f444c2c7 | 1700 | SHA256_Update(&sha2_headers, rh, strlen(rh)); |
cb224393 JH |
1701 | # elif defined(SHA_POLARSSL) |
1702 | sha1_update(&sha1_headers, US rh, strlen(rh)); | |
1703 | else | |
1704 | sha2_update(&sha2_headers, US rh, strlen(rh)); | |
1705 | # endif | |
f444c2c7 JH |
1706 | #endif |
1707 | ||
cb224393 | 1708 | #ifdef RSA_GNUTLS |
f444c2c7 JH |
1709 | /* Remember headers block for signing */ |
1710 | hdata = string_append(hdata, &hdata_alloc, &hdata_size, 1, rh); | |
1711 | #endif | |
3045f050 | 1712 | |
0d04a285 | 1713 | DEBUG(D_acl) pdkim_quoteprint(rh, strlen(rh), 1); |
3045f050 | 1714 | free(rh); |
80a47a2c TK |
1715 | } |
1716 | } | |
37f8b554 | 1717 | |
3045f050 JH |
1718 | /* VERIFICATION ----------------------------------------------------------- */ |
1719 | /* When verifying, walk through the header name list in the h= parameter and | |
1720 | add the headers to the hash in that order. */ | |
1721 | else | |
1722 | { | |
1723 | char *b = strdup(sig->headernames); | |
1724 | char *p = b; | |
1725 | char *q = NULL; | |
1726 | pdkim_stringlist *hdrs; | |
1727 | ||
1728 | if (!b) return PDKIM_ERR_OOM; | |
1729 | ||
1730 | /* clear tags */ | |
1731 | for (hdrs = ctx->headers; hdrs; hdrs = hdrs->next) | |
1732 | hdrs->tag = 0; | |
1733 | ||
1734 | while(1) | |
1735 | { | |
abe1010c | 1736 | if ((q = strchr(p, ':'))) |
3045f050 JH |
1737 | *q = '\0'; |
1738 | ||
1739 | for (hdrs = ctx->headers; hdrs; hdrs = hdrs->next) | |
1740 | if ( hdrs->tag == 0 | |
abe1010c | 1741 | && strncasecmp(hdrs->value, p, strlen(p)) == 0 |
3045f050 JH |
1742 | && (hdrs->value)[strlen(p)] == ':' |
1743 | ) | |
1744 | { | |
1745 | char *rh; | |
1746 | ||
1747 | rh = sig->canon_headers == PDKIM_CANON_RELAXED | |
abe1010c | 1748 | ? pdkim_relax_header(hdrs->value, 1) /* cook header for relaxed canon */ |
3045f050 JH |
1749 | : strdup(hdrs->value); /* just copy it for simple canon */ |
1750 | if (!rh) | |
1751 | return PDKIM_ERR_OOM; | |
1752 | ||
1753 | /* Feed header to the hash algorithm */ | |
cb224393 | 1754 | #ifdef SHA_GNUTLS |
f444c2c7 JH |
1755 | gnutls_hash(sha_headers, rh, strlen(rh)); |
1756 | #else | |
3045f050 | 1757 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) |
cb224393 | 1758 | # ifdef SHA_OPENSSL |
f444c2c7 | 1759 | SHA1_Update (&sha1_headers, rh, strlen(rh)); |
3045f050 | 1760 | else |
f444c2c7 | 1761 | SHA256_Update(&sha2_headers, rh, strlen(rh)); |
cb224393 JH |
1762 | # elif defined(SHA_POLARSSL) |
1763 | sha1_update(&sha1_headers, US rh, strlen(rh)); | |
1764 | else | |
1765 | sha2_update(&sha2_headers, US rh, strlen(rh)); | |
1766 | # endif | |
f444c2c7 | 1767 | #endif |
3045f050 | 1768 | |
0d04a285 | 1769 | DEBUG(D_acl) pdkim_quoteprint(rh, strlen(rh), 1); |
3045f050 JH |
1770 | free(rh); |
1771 | hdrs->tag = 1; | |
1772 | break; | |
1773 | } | |
1774 | ||
1775 | if (!q) break; | |
1776 | p = q+1; | |
80a47a2c | 1777 | } |
3045f050 | 1778 | free(b); |
80a47a2c TK |
1779 | } |
1780 | ||
0d04a285 | 1781 | DEBUG(D_acl) debug_printf( |
3045f050 | 1782 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 1783 | |
3045f050 JH |
1784 | /* SIGNING ---------------------------------------------------------------- */ |
1785 | if (ctx->mode == PDKIM_MODE_SIGN) | |
1786 | { | |
1787 | /* Copy headernames to signature struct */ | |
1788 | sig->headernames = strdup(headernames->str); | |
1789 | pdkim_strfree(headernames); | |
80a47a2c | 1790 | |
3045f050 JH |
1791 | /* Create signature header with b= omitted */ |
1792 | sig_hdr = pdkim_create_header(ctx->sig, 0); | |
80a47a2c | 1793 | } |
80a47a2c | 1794 | |
3045f050 JH |
1795 | /* VERIFICATION ----------------------------------------------------------- */ |
1796 | else | |
1797 | sig_hdr = strdup(sig->rawsig_no_b_val); | |
1798 | /* ------------------------------------------------------------------------ */ | |
1799 | ||
1800 | if (!sig_hdr) | |
1801 | return PDKIM_ERR_OOM; | |
80a47a2c | 1802 | |
3045f050 JH |
1803 | /* Relax header if necessary */ |
1804 | if (sig->canon_headers == PDKIM_CANON_RELAXED) | |
1805 | { | |
1806 | char *relaxed_hdr = pdkim_relax_header(sig_hdr, 0); | |
1807 | ||
1808 | free(sig_hdr); | |
1809 | if (!relaxed_hdr) | |
1810 | return PDKIM_ERR_OOM; | |
1811 | sig_hdr = relaxed_hdr; | |
80a47a2c TK |
1812 | } |
1813 | ||
0d04a285 | 1814 | DEBUG(D_acl) |
3045f050 | 1815 | { |
0d04a285 | 1816 | debug_printf( |
3045f050 | 1817 | "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n"); |
0d04a285 JH |
1818 | pdkim_quoteprint(sig_hdr, strlen(sig_hdr), 1); |
1819 | debug_printf( | |
3045f050 | 1820 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c | 1821 | } |
3045f050 JH |
1822 | |
1823 | /* Finalize header hash */ | |
cb224393 | 1824 | #ifdef SHA_GNUTLS |
f444c2c7 JH |
1825 | gnutls_hash(sha_headers, sig_hdr, strlen(sig_hdr)); |
1826 | gnutls_hash_output(sha_headers, headerhash); | |
1827 | #else | |
3045f050 | 1828 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) |
cb224393 | 1829 | # ifdef SHA_OPENSSL |
3045f050 | 1830 | { |
f444c2c7 JH |
1831 | SHA1_Update(&sha1_headers, sig_hdr, strlen(sig_hdr)); |
1832 | SHA1_Final(US headerhash, &sha1_headers); | |
80a47a2c | 1833 | } |
3045f050 JH |
1834 | else |
1835 | { | |
f444c2c7 JH |
1836 | SHA256_Update(&sha2_headers, sig_hdr, strlen(sig_hdr)); |
1837 | SHA256_Final(US headerhash, &sha2_headers); | |
1838 | } | |
cb224393 JH |
1839 | # elif defined(SHA_POLARSSL) |
1840 | { | |
1841 | sha1_update(&sha1_headers, US sig_hdr, strlen(sig_hdr)); | |
1842 | sha1_finish(&sha1_headers, US headerhash); | |
1843 | } | |
1844 | else | |
1845 | { | |
1846 | sha2_update(&sha2_headers, US sig_hdr, strlen(sig_hdr)); | |
1847 | sha2_finish(&sha2_headers, US headerhash); | |
1848 | } | |
1849 | # endif | |
f444c2c7 | 1850 | #endif |
3045f050 | 1851 | |
f444c2c7 JH |
1852 | DEBUG(D_acl) |
1853 | { | |
1854 | debug_printf("PDKIM [%s] hh computed: ", sig->domain); | |
1855 | pdkim_hexprint(headerhash, sig->algo == PDKIM_ALGO_RSA_SHA1 ? 20:32, 1); | |
80a47a2c TK |
1856 | } |
1857 | ||
cb224393 | 1858 | #ifdef RSA_GNUTLS |
f444c2c7 JH |
1859 | if (ctx->mode == PDKIM_MODE_SIGN) |
1860 | hdata = string_append(hdata, &hdata_alloc, &hdata_size, 1, sig_hdr); | |
1861 | #endif | |
1862 | ||
3045f050 | 1863 | free(sig_hdr); |
80a47a2c | 1864 | |
3045f050 JH |
1865 | /* SIGNING ---------------------------------------------------------------- */ |
1866 | if (ctx->mode == PDKIM_MODE_SIGN) | |
1867 | { | |
cb224393 JH |
1868 | #ifdef RSA_OPENSSL |
1869 | RSA * rsa; | |
1870 | uschar * p, * q; | |
1871 | int len; | |
1872 | #elif defined(RSA_GNUTLS) | |
f444c2c7 JH |
1873 | gnutls_x509_privkey_t rsa; |
1874 | gnutls_datum_t k; | |
1875 | int rc; | |
1876 | size_t sigsize; | |
f444c2c7 JH |
1877 | #endif |
1878 | ||
1879 | /* Import private key */ | |
cb224393 JH |
1880 | #ifdef RSA_OPENSSL |
1881 | ||
1882 | if ( !(p = Ustrstr(sig->rsa_privkey, "-----BEGIN RSA PRIVATE KEY-----")) | |
1883 | || !(q = Ustrstr(p+=31, "-----END RSA PRIVATE KEY-----")) | |
1884 | ) | |
df3def24 | 1885 | return PDKIM_SIGN_PRIVKEY_WRAP; |
cb224393 | 1886 | *q = '\0'; |
df3def24 JH |
1887 | if ((len = b64decode(p, &p)) < 0) |
1888 | { | |
1889 | DEBUG(D_acl) debug_printf("b64decode failed\n"); | |
1890 | return PDKIM_SIGN_PRIVKEY_B64D; | |
1891 | } | |
1892 | if (!(rsa = d2i_RSAPrivateKey(NULL, CUSS &p, len))) | |
1893 | { | |
1894 | DEBUG(D_acl) | |
1895 | { | |
1896 | char ssl_errstring[256]; | |
1897 | ERR_error_string(ERR_get_error(), ssl_errstring); | |
1898 | debug_printf("d2i_RSAPrivateKey: %s\n", ssl_errstring); | |
1899 | } | |
cb224393 | 1900 | return PDKIM_ERR_RSA_PRIVKEY; |
df3def24 | 1901 | } |
cb224393 JH |
1902 | |
1903 | #elif defined(RSA_GNUTLS) | |
f444c2c7 JH |
1904 | |
1905 | k.data = sig->rsa_privkey; | |
1906 | k.size = strlen(sig->rsa_privkey); | |
1907 | if ( (rc = gnutls_x509_privkey_init(&rsa)) != GNUTLS_E_SUCCESS | |
1908 | || (rc = gnutls_x509_privkey_import2(rsa, &k, | |
1909 | GNUTLS_X509_FMT_PEM, NULL, GNUTLS_PKCS_PLAIN)) != GNUTLS_E_SUCCESS | |
1910 | ) | |
1911 | { | |
1912 | DEBUG(D_acl) debug_printf("gnutls_x509_privkey_import2: %s\n", | |
1913 | gnutls_strerror(rc)); | |
1914 | return PDKIM_ERR_RSA_PRIVKEY; | |
1915 | } | |
80a47a2c | 1916 | |
f444c2c7 JH |
1917 | #endif |
1918 | ||
1919 | ||
1920 | /* Allocate mem for signature */ | |
cb224393 JH |
1921 | #ifdef RSA_OPENSSL |
1922 | sig->sigdata = store_get(RSA_size(rsa)); | |
1923 | #elif defined(RSA_GNUTLS) | |
f444c2c7 JH |
1924 | k.data = hdata; |
1925 | k.size = hdata_size; | |
1926 | (void) gnutls_x509_privkey_sign_data(rsa, | |
1927 | sig->algo == PDKIM_ALGO_RSA_SHA1 ? GNUTLS_DIG_SHA1 : GNUTLS_DIG_SHA256, | |
1928 | 0, &k, NULL, &sigsize); | |
1929 | sig->sigdata = store_get(sig->sigdata_len = sigsize); | |
f444c2c7 JH |
1930 | #endif |
1931 | ||
1932 | /* Do signing */ | |
cb224393 JH |
1933 | #ifdef RSA_OPENSSL |
1934 | ||
1935 | if (RSA_sign(sig->algo == PDKIM_ALGO_RSA_SHA1 ? NID_sha1 : NID_sha256, | |
1936 | CUS headerhash, sig->algo == PDKIM_ALGO_RSA_SHA1 ? 20 : 32, | |
1937 | US sig->sigdata, (unsigned int *)&sig->sigdata_len, | |
1938 | rsa) != 1) | |
1939 | return PDKIM_ERR_RSA_SIGNING; | |
1940 | RSA_free(rsa); | |
1941 | ||
1942 | #elif defined(RSA_GNUTLS) | |
80a47a2c | 1943 | |
f444c2c7 JH |
1944 | if ((rc = gnutls_x509_privkey_sign_data(rsa, |
1945 | sig->algo == PDKIM_ALGO_RSA_SHA1 ? GNUTLS_DIG_SHA1 : GNUTLS_DIG_SHA256, | |
1946 | 0, &k, sig->sigdata, &sigsize)) != GNUTLS_E_SUCCESS | |
1947 | ) | |
1948 | { | |
1949 | DEBUG(D_acl) debug_printf("gnutls_x509_privkey_sign_data: %s\n", | |
1950 | gnutls_strerror(rc)); | |
1951 | return PDKIM_ERR_RSA_SIGNING; | |
1952 | } | |
1953 | gnutls_x509_privkey_deinit(rsa); | |
1954 | ||
f444c2c7 | 1955 | #endif |
80a47a2c | 1956 | |
80a47a2c | 1957 | |
0d04a285 | 1958 | DEBUG(D_acl) |
3045f050 | 1959 | { |
0d04a285 JH |
1960 | debug_printf( "PDKIM [%s] b computed: ", sig->domain); |
1961 | pdkim_hexprint(sig->sigdata, sig->sigdata_len, 1); | |
80a47a2c | 1962 | } |
80a47a2c | 1963 | |
abe1010c | 1964 | if (!(sig->signature_header = pdkim_create_header(ctx->sig, 1))) |
3045f050 | 1965 | return PDKIM_ERR_OOM; |
80a47a2c | 1966 | } |
80a47a2c | 1967 | |
3045f050 JH |
1968 | /* VERIFICATION ----------------------------------------------------------- */ |
1969 | else | |
1970 | { | |
cb224393 JH |
1971 | #ifdef RSA_OPENSSL |
1972 | RSA * rsa; | |
1973 | const unsigned char * p; | |
1974 | #elif defined(RSA_GNUTLS) | |
f444c2c7 JH |
1975 | gnutls_pubkey_t rsa; |
1976 | gnutls_datum_t k, s; | |
1977 | int rc; | |
f444c2c7 | 1978 | #endif |
3045f050 JH |
1979 | char *dns_txt_name, *dns_txt_reply; |
1980 | ||
cb224393 | 1981 | #ifdef RSA_GNUTLS |
f444c2c7 JH |
1982 | gnutls_pubkey_init(&rsa); |
1983 | #endif | |
1984 | ||
1985 | /* Fetch public key for signing domain, from DNS */ | |
3045f050 JH |
1986 | |
1987 | if (!(dns_txt_name = malloc(PDKIM_DNS_TXT_MAX_NAMELEN))) | |
1988 | return PDKIM_ERR_OOM; | |
1989 | ||
1990 | if (!(dns_txt_reply = malloc(PDKIM_DNS_TXT_MAX_RECLEN))) | |
1991 | { | |
1992 | free(dns_txt_name); | |
1993 | return PDKIM_ERR_OOM; | |
80a47a2c TK |
1994 | } |
1995 | ||
3045f050 JH |
1996 | memset(dns_txt_reply, 0, PDKIM_DNS_TXT_MAX_RECLEN); |
1997 | memset(dns_txt_name , 0, PDKIM_DNS_TXT_MAX_NAMELEN); | |
1998 | ||
abe1010c | 1999 | if (snprintf(dns_txt_name, PDKIM_DNS_TXT_MAX_NAMELEN, |
3045f050 | 2000 | "%s._domainkey.%s.", |
abe1010c | 2001 | sig->selector, sig->domain) >= PDKIM_DNS_TXT_MAX_NAMELEN) |
3045f050 JH |
2002 | { |
2003 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
2004 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_BUFFER_SIZE; | |
2005 | goto NEXT_VERIFY; | |
80a47a2c | 2006 | } |
3045f050 JH |
2007 | |
2008 | if ( ctx->dns_txt_callback(dns_txt_name, dns_txt_reply) != PDKIM_OK | |
2009 | || dns_txt_reply[0] == '\0') | |
2010 | { | |
2011 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
2012 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE; | |
2013 | goto NEXT_VERIFY; | |
80a47a2c TK |
2014 | } |
2015 | ||
0d04a285 | 2016 | DEBUG(D_acl) |
3045f050 | 2017 | { |
0d04a285 JH |
2018 | debug_printf( |
2019 | "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n" | |
2020 | " Raw record: "); | |
2021 | pdkim_quoteprint(dns_txt_reply, strlen(dns_txt_reply), 1); | |
80a47a2c | 2022 | } |
3045f050 | 2023 | |
abe1010c | 2024 | if (!(sig->pubkey = pdkim_parse_pubkey_record(ctx, dns_txt_reply))) |
3045f050 JH |
2025 | { |
2026 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
df3def24 | 2027 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD; |
3045f050 | 2028 | |
0d04a285 JH |
2029 | DEBUG(D_acl) debug_printf( |
2030 | " Error while parsing public key record\n" | |
3045f050 | 2031 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
3045f050 | 2032 | goto NEXT_VERIFY; |
80a47a2c TK |
2033 | } |
2034 | ||
0d04a285 | 2035 | DEBUG(D_acl) debug_printf( |
3045f050 | 2036 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
3045f050 | 2037 | |
f444c2c7 | 2038 | /* Import public key */ |
cb224393 JH |
2039 | #ifdef RSA_OPENSSL |
2040 | ||
2041 | p = CUS sig->pubkey->key; | |
2042 | if (!(rsa = d2i_RSA_PUBKEY(NULL, &p, (long) sig->pubkey->key_len))) | |
2043 | ||
2044 | #elif defined(RSA_GNUTLS) | |
f444c2c7 JH |
2045 | |
2046 | k.data = sig->pubkey->key; | |
2047 | k.size = sig->pubkey->key_len; | |
2048 | if ((rc = gnutls_pubkey_import(rsa, &k, GNUTLS_X509_FMT_DER)) | |
2049 | != GNUTLS_E_SUCCESS) | |
2050 | ||
f444c2c7 | 2051 | #endif |
3045f050 | 2052 | { |
f444c2c7 JH |
2053 | DEBUG(D_acl) |
2054 | { | |
cb224393 | 2055 | #ifdef RSA_OPENSSL |
f444c2c7 JH |
2056 | long e; |
2057 | ERR_load_crypto_strings(); /*XXX move to a startup routine */ | |
2058 | while ((e = ERR_get_error())) | |
2059 | debug_printf("Az: %.120s\n", ERR_error_string(e, NULL)); | |
cb224393 JH |
2060 | #elif defined(RSA_GNUTLS) |
2061 | debug_printf("gnutls_pubkey_import: %s\n", gnutls_strerror(rc)); | |
f444c2c7 JH |
2062 | #endif |
2063 | } | |
2064 | ||
3045f050 | 2065 | sig->verify_status = PDKIM_VERIFY_INVALID; |
df3def24 | 2066 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_IMPORT; |
3045f050 | 2067 | goto NEXT_VERIFY; |
80a47a2c TK |
2068 | } |
2069 | ||
3045f050 | 2070 | /* Check the signature */ |
cb224393 JH |
2071 | #ifdef RSA_OPENSSL |
2072 | ||
2073 | if (RSA_verify(sig->algo == PDKIM_ALGO_RSA_SHA1 ? NID_sha1 : NID_sha256, | |
2074 | CUS headerhash, sig->algo == PDKIM_ALGO_RSA_SHA1 ? 20 : 32, | |
2075 | US sig->sigdata, (unsigned int)sig->sigdata_len, | |
2076 | rsa) != 1) | |
2077 | ||
2078 | #elif defined(RSA_GNUTLS) | |
f444c2c7 JH |
2079 | |
2080 | k.data = headerhash; | |
2081 | k.size = sig->algo == PDKIM_ALGO_RSA_SHA1 ? 20 : 32; | |
2082 | s.data = sig->sigdata; | |
2083 | s.size = sig->sigdata_len; | |
2084 | if ((rc = gnutls_pubkey_verify_hash2(rsa, | |
2085 | sig->algo == PDKIM_ALGO_RSA_SHA1 | |
2086 | ? GNUTLS_SIGN_RSA_SHA1 : GNUTLS_SIGN_RSA_SHA256, | |
2087 | 0, &k, &s)) < 0) | |
2088 | ||
f444c2c7 | 2089 | #endif |
3045f050 | 2090 | { |
cb224393 | 2091 | #if defined(RSA_GNUTLS) |
f444c2c7 JH |
2092 | debug_printf("gnutls_pubkey_verify_hash2: %s\n", gnutls_strerror(rc)); |
2093 | #endif | |
3045f050 JH |
2094 | sig->verify_status = PDKIM_VERIFY_FAIL; |
2095 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE; | |
2096 | goto NEXT_VERIFY; | |
ff7ddfd7 TK |
2097 | } |
2098 | ||
3045f050 JH |
2099 | /* We have a winner! (if bodydhash was correct earlier) */ |
2100 | if (sig->verify_status == PDKIM_VERIFY_NONE) | |
2101 | sig->verify_status = PDKIM_VERIFY_PASS; | |
2102 | ||
2103 | NEXT_VERIFY: | |
2104 | ||
0d04a285 | 2105 | DEBUG(D_acl) |
3045f050 | 2106 | { |
0d04a285 | 2107 | debug_printf("PDKIM [%s] signature status: %s", |
3045f050 JH |
2108 | sig->domain, pdkim_verify_status_str(sig->verify_status)); |
2109 | if (sig->verify_ext_status > 0) | |
0d04a285 | 2110 | debug_printf(" (%s)\n", |
3045f050 JH |
2111 | pdkim_verify_ext_status_str(sig->verify_ext_status)); |
2112 | else | |
0d04a285 | 2113 | debug_printf("\n"); |
80a47a2c | 2114 | } |
80a47a2c | 2115 | |
cb224393 | 2116 | #ifdef RSA_GNUTLS |
f444c2c7 JH |
2117 | gnutls_pubkey_deinit(rsa); |
2118 | #endif | |
3045f050 JH |
2119 | free(dns_txt_name); |
2120 | free(dns_txt_reply); | |
80a47a2c TK |
2121 | } |
2122 | ||
3045f050 | 2123 | sig = sig->next; |
80a47a2c TK |
2124 | } |
2125 | ||
3045f050 JH |
2126 | /* If requested, set return pointer to signature(s) */ |
2127 | if (return_signatures) | |
2128 | *return_signatures = ctx->sig; | |
80a47a2c | 2129 | |
3045f050 | 2130 | return PDKIM_OK; |
80a47a2c TK |
2131 | } |
2132 | ||
2133 | ||
2134 | /* -------------------------------------------------------------------------- */ | |
3045f050 JH |
2135 | |
2136 | DLLEXPORT pdkim_ctx * | |
0d04a285 | 2137 | pdkim_init_verify(int(*dns_txt_callback)(char *, char *)) |
3045f050 JH |
2138 | { |
2139 | pdkim_ctx *ctx = malloc(sizeof(pdkim_ctx)); | |
2140 | ||
2141 | if (!ctx) | |
2142 | return NULL; | |
abe1010c | 2143 | memset(ctx, 0, sizeof(pdkim_ctx)); |
3045f050 JH |
2144 | |
2145 | if (!(ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN))) | |
2146 | { | |
2147 | free(ctx); | |
2148 | return NULL; | |
80a47a2c TK |
2149 | } |
2150 | ||
3045f050 | 2151 | ctx->mode = PDKIM_MODE_VERIFY; |
3045f050 | 2152 | ctx->dns_txt_callback = dns_txt_callback; |
80a47a2c | 2153 | |
3045f050 | 2154 | return ctx; |
80a47a2c TK |
2155 | } |
2156 | ||
2157 | ||
2158 | /* -------------------------------------------------------------------------- */ | |
80a47a2c | 2159 | |
3045f050 | 2160 | DLLEXPORT pdkim_ctx * |
f444c2c7 | 2161 | pdkim_init_sign(char *domain, char *selector, char *rsa_privkey, int algo) |
3045f050 JH |
2162 | { |
2163 | pdkim_ctx *ctx; | |
2164 | pdkim_signature *sig; | |
80a47a2c | 2165 | |
3045f050 JH |
2166 | if (!domain || !selector || !rsa_privkey) |
2167 | return NULL; | |
80a47a2c | 2168 | |
3045f050 JH |
2169 | if (!(ctx = malloc(sizeof(pdkim_ctx)))) |
2170 | return NULL; | |
abe1010c | 2171 | memset(ctx, 0, sizeof(pdkim_ctx)); |
80a47a2c | 2172 | |
3045f050 JH |
2173 | if (!(ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN))) |
2174 | { | |
2175 | free(ctx); | |
2176 | return NULL; | |
80a47a2c TK |
2177 | } |
2178 | ||
3045f050 JH |
2179 | if (!(sig = malloc(sizeof(pdkim_signature)))) |
2180 | { | |
2181 | free(ctx->linebuf); | |
2182 | free(ctx); | |
2183 | return NULL; | |
80a47a2c | 2184 | } |
abe1010c | 2185 | memset(sig, 0, sizeof(pdkim_signature)); |
80a47a2c | 2186 | |
3045f050 | 2187 | sig->bodylength = -1; |
80a47a2c | 2188 | |
3045f050 | 2189 | ctx->mode = PDKIM_MODE_SIGN; |
3045f050 | 2190 | ctx->sig = sig; |
80a47a2c | 2191 | |
3045f050 JH |
2192 | ctx->sig->domain = strdup(domain); |
2193 | ctx->sig->selector = strdup(selector); | |
2194 | ctx->sig->rsa_privkey = strdup(rsa_privkey); | |
f444c2c7 | 2195 | ctx->sig->algo = algo; |
3045f050 JH |
2196 | |
2197 | if (!ctx->sig->domain || !ctx->sig->selector || !ctx->sig->rsa_privkey) | |
2198 | goto BAIL; | |
2199 | ||
cb224393 JH |
2200 | #ifdef SHA_OPENSSL |
2201 | SHA1_Init (&ctx->sig->sha1_body); | |
2202 | SHA256_Init(&ctx->sig->sha2_body); | |
2203 | ||
2204 | #elif defined(SHA_GNUTLS) | |
f444c2c7 JH |
2205 | gnutls_hash_init(&ctx->sig->sha_body, |
2206 | algo == PDKIM_ALGO_RSA_SHA1 ? GNUTLS_DIG_SHA1 : GNUTLS_DIG_SHA256); | |
3045f050 | 2207 | |
cb224393 JH |
2208 | #elif defined(SHA_POLARSSL) |
2209 | if (!(ctx->sig->sha1_body = malloc(sizeof(sha1_context)))) | |
2210 | goto BAIL; | |
2211 | sha1_starts(ctx->sig->sha1_body); | |
2212 | ||
2213 | if (!(ctx->sig->sha2_body = malloc(sizeof(sha2_context)))) | |
2214 | goto BAIL; | |
2215 | sha2_starts(ctx->sig->sha2_body, 0); | |
f444c2c7 JH |
2216 | |
2217 | #endif | |
3045f050 JH |
2218 | |
2219 | return ctx; | |
2220 | ||
2221 | BAIL: | |
2222 | pdkim_free_ctx(ctx); | |
2223 | return NULL; | |
6ab02e3f | 2224 | } |
80a47a2c | 2225 | |
f444c2c7 | 2226 | |
80a47a2c | 2227 | /* -------------------------------------------------------------------------- */ |
3045f050 JH |
2228 | |
2229 | DLLEXPORT int | |
2230 | pdkim_set_optional(pdkim_ctx *ctx, | |
80a47a2c TK |
2231 | char *sign_headers, |
2232 | char *identity, | |
2233 | int canon_headers, | |
2234 | int canon_body, | |
2235 | long bodylength, | |
80a47a2c | 2236 | unsigned long created, |
3045f050 JH |
2237 | unsigned long expires) |
2238 | { | |
3045f050 JH |
2239 | if (identity) |
2240 | if (!(ctx->sig->identity = strdup(identity))) | |
2241 | return PDKIM_ERR_OOM; | |
80a47a2c | 2242 | |
3045f050 JH |
2243 | if (sign_headers) |
2244 | if (!(ctx->sig->sign_headers = strdup(sign_headers))) | |
2245 | return PDKIM_ERR_OOM; | |
80a47a2c | 2246 | |
3045f050 JH |
2247 | ctx->sig->canon_headers = canon_headers; |
2248 | ctx->sig->canon_body = canon_body; | |
2249 | ctx->sig->bodylength = bodylength; | |
3045f050 JH |
2250 | ctx->sig->created = created; |
2251 | ctx->sig->expires = expires; | |
80a47a2c | 2252 | |
3045f050 | 2253 | return PDKIM_OK; |
6ab02e3f | 2254 | } |
3045f050 | 2255 | |
3045f050 | 2256 | |
f444c2c7 | 2257 | #endif /*DISABLE_DKIM*/ |