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