Commit | Line | Data |
---|---|---|
80a47a2c TK |
1 | /* |
2 | * PDKIM - a RFC4871 (DKIM) implementation | |
3 | * | |
4 | * Copyright (C) 2009 Tom Kistner <tom@duncanthrax.net> | |
5 | * | |
6 | * http://duncanthrax.net/pdkim/ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | ||
13f492fc | 23 | /* $Cambridge: exim/src/src/pdkim/pdkim.c,v 1.14 2010/05/29 19:14:06 nm4 Exp $ */ |
80a47a2c TK |
24 | |
25 | #include <stdlib.h> | |
26 | #include <stdio.h> | |
27 | #include <string.h> | |
28 | #include <ctype.h> | |
29 | ||
30 | #include "pdkim.h" | |
31 | ||
32 | #include "sha1.h" | |
33 | #include "sha2.h" | |
34 | #include "rsa.h" | |
35 | #include "base64.h" | |
36 | ||
37 | #define PDKIM_SIGNATURE_VERSION "1" | |
38 | #define PDKIM_PUB_RECORD_VERSION "DKIM1" | |
39 | ||
40 | #define PDKIM_MAX_HEADER_LEN 65536 | |
41 | #define PDKIM_MAX_HEADERS 512 | |
42 | #define PDKIM_MAX_BODY_LINE_LEN 16384 | |
43 | #define PDKIM_DNS_TXT_MAX_NAMELEN 1024 | |
44 | #define PDKIM_DEFAULT_SIGN_HEADERS "From:Sender:Reply-To:Subject:Date:"\ | |
45 | "Message-ID:To:Cc:MIME-Version:Content-Type:"\ | |
46 | "Content-Transfer-Encoding:Content-ID:"\ | |
47 | "Content-Description:Resent-Date:Resent-From:"\ | |
48 | "Resent-Sender:Resent-To:Resent-Cc:"\ | |
49 | "Resent-Message-ID:In-Reply-To:References:"\ | |
50 | "List-Id:List-Help:List-Unsubscribe:"\ | |
51 | "List-Subscribe:List-Post:List-Owner:List-Archive" | |
52 | ||
53 | /* -------------------------------------------------------------------------- */ | |
54 | struct pdkim_stringlist { | |
55 | char *value; | |
56 | void *next; | |
57 | }; | |
58 | ||
59 | #define PDKIM_STR_ALLOC_FRAG 256 | |
60 | struct pdkim_str { | |
61 | char *str; | |
62 | unsigned int len; | |
63 | unsigned int allocated; | |
64 | }; | |
65 | ||
66 | /* -------------------------------------------------------------------------- */ | |
67 | /* A bunch of list constants */ | |
68 | char *pdkim_querymethods[] = { | |
69 | "dns/txt", | |
70 | NULL | |
71 | }; | |
72 | char *pdkim_algos[] = { | |
73 | "rsa-sha256", | |
74 | "rsa-sha1", | |
75 | NULL | |
76 | }; | |
77 | char *pdkim_canons[] = { | |
78 | "simple", | |
79 | "relaxed", | |
80 | NULL | |
81 | }; | |
82 | char *pdkim_hashes[] = { | |
83 | "sha256", | |
84 | "sha1", | |
85 | NULL | |
86 | }; | |
87 | char *pdkim_keytypes[] = { | |
88 | "rsa", | |
89 | NULL | |
90 | }; | |
91 | ||
92 | typedef struct pdkim_combined_canon_entry { | |
93 | char *str; | |
94 | int canon_headers; | |
95 | int canon_body; | |
96 | } pdkim_combined_canon_entry; | |
97 | pdkim_combined_canon_entry pdkim_combined_canons[] = { | |
98 | { "simple/simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, | |
99 | { "simple/relaxed", PDKIM_CANON_SIMPLE, PDKIM_CANON_RELAXED }, | |
100 | { "relaxed/simple", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, | |
101 | { "relaxed/relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_RELAXED }, | |
102 | { "simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, | |
103 | { "relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, | |
104 | { NULL, 0, 0 } | |
105 | }; | |
106 | ||
107 | ||
ff7ddfd7 TK |
108 | char *pdkim_verify_status_str(int status) { |
109 | switch(status) { | |
110 | case PDKIM_VERIFY_NONE: return "PDKIM_VERIFY_NONE"; | |
111 | case PDKIM_VERIFY_INVALID: return "PDKIM_VERIFY_INVALID"; | |
112 | case PDKIM_VERIFY_FAIL: return "PDKIM_VERIFY_FAIL"; | |
113 | case PDKIM_VERIFY_PASS: return "PDKIM_VERIFY_PASS"; | |
114 | default: return "PDKIM_VERIFY_UNKNOWN"; | |
115 | } | |
116 | } | |
117 | char *pdkim_verify_ext_status_str(int ext_status) { | |
118 | switch(ext_status) { | |
119 | case PDKIM_VERIFY_FAIL_BODY: return "PDKIM_VERIFY_FAIL_BODY"; | |
120 | case PDKIM_VERIFY_FAIL_MESSAGE: return "PDKIM_VERIFY_FAIL_MESSAGE"; | |
121 | case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE"; | |
122 | case PDKIM_VERIFY_INVALID_BUFFER_SIZE: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE"; | |
123 | case PDKIM_VERIFY_INVALID_PUBKEY_PARSING: return "PDKIM_VERIFY_INVALID_PUBKEY_PARSING"; | |
124 | default: return "PDKIM_VERIFY_UNKNOWN"; | |
125 | } | |
126 | } | |
127 | ||
128 | ||
80a47a2c TK |
129 | /* -------------------------------------------------------------------------- */ |
130 | /* Print debugging functions */ | |
131 | #ifdef PDKIM_DEBUG | |
132 | void pdkim_quoteprint(FILE *stream, char *data, int len, int lf) { | |
133 | int i; | |
134 | unsigned char *p = (unsigned char *)data; | |
135 | ||
136 | for (i=0;i<len;i++) { | |
137 | int c = p[i]; | |
138 | switch (c) { | |
139 | case ' ' : fprintf(stream,"{SP}"); break; | |
140 | case '\t': fprintf(stream,"{TB}"); break; | |
141 | case '\r': fprintf(stream,"{CR}"); break; | |
142 | case '\n': fprintf(stream,"{LF}"); break; | |
143 | case '{' : fprintf(stream,"{BO}"); break; | |
144 | case '}' : fprintf(stream,"{BC}"); break; | |
145 | default: | |
146 | if ( (c < 32) || (c > 127) ) | |
147 | fprintf(stream,"{%02x}",c); | |
148 | else | |
149 | fputc(c,stream); | |
150 | break; | |
151 | } | |
152 | } | |
153 | if (lf) | |
154 | fputc('\n',stream); | |
155 | } | |
156 | void pdkim_hexprint(FILE *stream, char *data, int len, int lf) { | |
157 | int i; | |
158 | unsigned char *p = (unsigned char *)data; | |
159 | ||
160 | for (i=0;i<len;i++) { | |
161 | int c = p[i]; | |
162 | fprintf(stream,"%02x",c); | |
163 | } | |
164 | if (lf) | |
165 | fputc('\n',stream); | |
166 | } | |
167 | #endif | |
168 | ||
169 | ||
170 | /* -------------------------------------------------------------------------- */ | |
171 | /* Simple string list implementation for convinience */ | |
172 | pdkim_stringlist *pdkim_append_stringlist(pdkim_stringlist *base, char *str) { | |
173 | pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist)); | |
174 | if (new_entry == NULL) return NULL; | |
175 | memset(new_entry,0,sizeof(pdkim_stringlist)); | |
176 | new_entry->value = strdup(str); | |
177 | if (new_entry->value == NULL) return NULL; | |
178 | if (base != NULL) { | |
179 | pdkim_stringlist *last = base; | |
6ab02e3f | 180 | while (last->next != NULL) { last = last->next; } |
80a47a2c TK |
181 | last->next = new_entry; |
182 | return base; | |
183 | } | |
184 | else return new_entry; | |
6ab02e3f | 185 | } |
97713345 TK |
186 | pdkim_stringlist *pdkim_prepend_stringlist(pdkim_stringlist *base, char *str) { |
187 | pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist)); | |
188 | if (new_entry == NULL) return NULL; | |
189 | memset(new_entry,0,sizeof(pdkim_stringlist)); | |
190 | new_entry->value = strdup(str); | |
191 | if (new_entry->value == NULL) return NULL; | |
192 | if (base != NULL) { | |
193 | new_entry->next = base; | |
194 | } | |
195 | return new_entry; | |
6ab02e3f | 196 | } |
80a47a2c TK |
197 | |
198 | ||
199 | /* -------------------------------------------------------------------------- */ | |
200 | /* A small "growing string" implementation to escape malloc/realloc hell */ | |
201 | pdkim_str *pdkim_strnew (char *cstr) { | |
202 | unsigned int len = cstr?strlen(cstr):0; | |
203 | pdkim_str *p = malloc(sizeof(pdkim_str)); | |
204 | if (p == NULL) return NULL; | |
205 | memset(p,0,sizeof(pdkim_str)); | |
206 | p->str = malloc(len+1); | |
207 | if (p->str == NULL) { | |
208 | free(p); | |
209 | return NULL; | |
210 | } | |
211 | p->allocated=(len+1); | |
212 | p->len=len; | |
213 | if (cstr) strcpy(p->str,cstr); | |
13f492fc | 214 | else p->str[p->len] = '\0'; |
80a47a2c | 215 | return p; |
6ab02e3f | 216 | } |
80a47a2c TK |
217 | char *pdkim_strncat(pdkim_str *str, char *data, int len) { |
218 | if ((str->allocated - str->len) < (len+1)) { | |
219 | /* Extend the buffer */ | |
220 | int num_frags = ((len+1)/PDKIM_STR_ALLOC_FRAG)+1; | |
221 | char *n = realloc(str->str, | |
222 | (str->allocated+(num_frags*PDKIM_STR_ALLOC_FRAG))); | |
223 | if (n == NULL) return NULL; | |
224 | str->str = n; | |
225 | str->allocated += (num_frags*PDKIM_STR_ALLOC_FRAG); | |
226 | } | |
227 | strncpy(&(str->str[str->len]),data,len); | |
228 | str->len+=len; | |
229 | str->str[str->len] = '\0'; | |
230 | return str->str; | |
6ab02e3f | 231 | } |
80a47a2c TK |
232 | char *pdkim_strcat(pdkim_str *str, char *cstr) { |
233 | return pdkim_strncat(str, cstr, strlen(cstr)); | |
6ab02e3f | 234 | } |
80a47a2c TK |
235 | char *pdkim_numcat(pdkim_str *str, unsigned long num) { |
236 | char minibuf[20]; | |
237 | snprintf(minibuf,20,"%lu",num); | |
238 | return pdkim_strcat(str,minibuf); | |
6ab02e3f | 239 | } |
80a47a2c TK |
240 | char *pdkim_strtrim(pdkim_str *str) { |
241 | char *p = str->str; | |
242 | char *q = str->str; | |
243 | while ( (*p != '\0') && ((*p == '\t') || (*p == ' ')) ) p++; | |
6ab02e3f | 244 | while (*p != '\0') {*q = *p; q++; p++;} |
80a47a2c TK |
245 | *q = '\0'; |
246 | while ( (q != str->str) && ( (*q == '\0') || (*q == '\t') || (*q == ' ') ) ) { | |
247 | *q = '\0'; | |
248 | q--; | |
249 | } | |
250 | str->len = strlen(str->str); | |
251 | return str->str; | |
6ab02e3f | 252 | } |
80a47a2c TK |
253 | char *pdkim_strclear(pdkim_str *str) { |
254 | str->str[0] = '\0'; | |
255 | str->len = 0; | |
256 | return str->str; | |
6ab02e3f | 257 | } |
80a47a2c TK |
258 | void pdkim_strfree(pdkim_str *str) { |
259 | if (str == NULL) return; | |
260 | if (str->str != NULL) free(str->str); | |
261 | free(str); | |
6ab02e3f | 262 | } |
80a47a2c TK |
263 | |
264 | ||
265 | ||
266 | /* -------------------------------------------------------------------------- */ | |
267 | void pdkim_free_pubkey(pdkim_pubkey *pub) { | |
268 | if (pub) { | |
269 | if (pub->version != NULL) free(pub->version); | |
270 | if (pub->granularity != NULL) free(pub->granularity); | |
271 | if (pub->hashes != NULL) free(pub->hashes); | |
272 | if (pub->keytype != NULL) free(pub->keytype); | |
273 | if (pub->srvtype != NULL) free(pub->srvtype); | |
274 | if (pub->notes != NULL) free(pub->notes); | |
275 | if (pub->key != NULL) free(pub->key); | |
276 | free(pub); | |
277 | } | |
278 | } | |
279 | ||
280 | ||
281 | /* -------------------------------------------------------------------------- */ | |
282 | void pdkim_free_sig(pdkim_signature *sig) { | |
283 | if (sig) { | |
284 | pdkim_signature *next = (pdkim_signature *)sig->next; | |
285 | ||
286 | pdkim_stringlist *e = sig->headers; | |
287 | while(e != NULL) { | |
288 | pdkim_stringlist *c = e; | |
289 | if (e->value != NULL) free(e->value); | |
290 | e = e->next; | |
291 | free(c); | |
292 | } | |
293 | ||
294 | if (sig->sigdata != NULL) free(sig->sigdata); | |
295 | if (sig->bodyhash != NULL) free(sig->bodyhash); | |
296 | if (sig->selector != NULL) free(sig->selector); | |
297 | if (sig->domain != NULL) free(sig->domain); | |
298 | if (sig->identity != NULL) free(sig->identity); | |
299 | if (sig->headernames != NULL) free(sig->headernames); | |
300 | if (sig->copiedheaders != NULL) free(sig->copiedheaders); | |
301 | if (sig->rsa_privkey != NULL) free(sig->rsa_privkey); | |
302 | if (sig->sign_headers != NULL) free(sig->sign_headers); | |
303 | if (sig->signature_header != NULL) free(sig->signature_header); | |
304 | if (sig->sha1_body != NULL) free(sig->sha1_body); | |
305 | if (sig->sha2_body != NULL) free(sig->sha2_body); | |
306 | if (sig->hnames_check != NULL) free(sig->hnames_check); | |
307 | ||
308 | if (sig->pubkey != NULL) pdkim_free_pubkey(sig->pubkey); | |
309 | ||
310 | free(sig); | |
311 | if (next != NULL) pdkim_free_sig(next); | |
312 | } | |
6ab02e3f | 313 | } |
80a47a2c TK |
314 | |
315 | ||
316 | /* -------------------------------------------------------------------------- */ | |
317 | DLLEXPORT void pdkim_free_ctx(pdkim_ctx *ctx) { | |
318 | if (ctx) { | |
319 | pdkim_free_sig(ctx->sig); | |
320 | pdkim_strfree(ctx->cur_header); | |
321 | free(ctx); | |
322 | } | |
6ab02e3f | 323 | } |
80a47a2c TK |
324 | |
325 | ||
326 | /* -------------------------------------------------------------------------- */ | |
327 | /* Matches the name of the passed raw "header" against | |
328 | the passed colon-separated "list", starting at entry | |
329 | "start". Returns the position of the header name in | |
330 | the list. */ | |
331 | int header_name_match(char *header, | |
332 | char *tick, | |
333 | int do_tick) { | |
334 | char *hname; | |
335 | char *lcopy; | |
336 | char *p; | |
337 | char *q; | |
338 | int rc = PDKIM_FAIL; | |
339 | ||
340 | /* Get header name */ | |
341 | char *hcolon = strchr(header,':'); | |
342 | if (hcolon == NULL) return rc; /* This isn't a header */ | |
343 | hname = malloc((hcolon-header)+1); | |
344 | if (hname == NULL) return PDKIM_ERR_OOM; | |
345 | memset(hname,0,(hcolon-header)+1); | |
346 | strncpy(hname,header,(hcolon-header)); | |
347 | ||
348 | /* Copy tick-off list locally, so we can punch zeroes into it */ | |
349 | lcopy = strdup(tick); | |
350 | if (lcopy == NULL) { | |
351 | free(hname); | |
352 | return PDKIM_ERR_OOM; | |
353 | } | |
354 | p = lcopy; | |
355 | q = strchr(p,':'); | |
356 | while (q != NULL) { | |
357 | *q = '\0'; | |
358 | ||
359 | if (strcasecmp(p,hname) == 0) { | |
360 | rc = PDKIM_OK; | |
361 | /* Invalidate header name instance in tick-off list */ | |
362 | if (do_tick) tick[p-lcopy] = '_'; | |
363 | goto BAIL; | |
364 | } | |
365 | ||
366 | p = q+1; | |
367 | q = strchr(p,':'); | |
368 | } | |
369 | ||
370 | if (strcasecmp(p,hname) == 0) { | |
371 | rc = PDKIM_OK; | |
372 | /* Invalidate header name instance in tick-off list */ | |
373 | if (do_tick) tick[p-lcopy] = '_'; | |
374 | } | |
375 | ||
376 | BAIL: | |
377 | free(hname); | |
378 | free(lcopy); | |
379 | return rc; | |
380 | } | |
381 | ||
382 | ||
383 | /* -------------------------------------------------------------------------- */ | |
384 | /* Performs "relaxed" canonicalization of a header. The returned pointer needs | |
385 | to be free()d. */ | |
386 | char *pdkim_relax_header (char *header, int crlf) { | |
387 | int past_field_name = 0; | |
388 | int seen_wsp = 0; | |
389 | char *p = header; | |
390 | char *q; | |
a7921bbe | 391 | char *relaxed = malloc(strlen(header)+3); |
80a47a2c TK |
392 | if (relaxed == NULL) return NULL; |
393 | q = relaxed; | |
394 | while (*p != '\0') { | |
395 | int c = *p; | |
396 | /* Ignore CR & LF */ | |
397 | if ( (c == '\r') || (c == '\n') ) { | |
398 | p++; | |
399 | continue; | |
400 | } | |
401 | if ( (c == '\t') || (c == ' ') ) { | |
402 | c = ' '; /* Turns WSP into SP */ | |
403 | if (seen_wsp) { | |
404 | p++; | |
405 | continue; | |
406 | } | |
407 | else seen_wsp = 1; | |
408 | } | |
409 | else { | |
410 | if ( (!past_field_name) && (c == ':') ) { | |
411 | if (seen_wsp) q--; /* This removes WSP before the colon */ | |
412 | seen_wsp = 1; /* This removes WSP after the colon */ | |
413 | past_field_name = 1; | |
414 | } | |
415 | else seen_wsp = 0; | |
416 | } | |
417 | /* Lowercase header name */ | |
418 | if (!past_field_name) c = tolower(c); | |
419 | *q = c; | |
420 | p++; | |
421 | q++; | |
422 | } | |
423 | *q = '\0'; | |
424 | if (crlf) strcat(relaxed,"\r\n"); | |
425 | return relaxed; | |
6ab02e3f | 426 | } |
80a47a2c TK |
427 | |
428 | ||
429 | /* -------------------------------------------------------------------------- */ | |
430 | #define PDKIM_QP_ERROR_DECODE -1 | |
431 | char *pdkim_decode_qp_char(char *qp_p, int *c) { | |
432 | char *initial_pos = qp_p; | |
433 | ||
434 | /* Advance one char */ | |
435 | qp_p++; | |
436 | ||
437 | /* Check for two hex digits and decode them */ | |
438 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) { | |
439 | /* Do hex conversion */ | |
440 | if (isdigit(*qp_p)) {*c = *qp_p - '0';} | |
6ab02e3f | 441 | else {*c = toupper(*qp_p) - 'A' + 10;} |
80a47a2c TK |
442 | *c <<= 4; |
443 | if (isdigit(qp_p[1])) {*c |= qp_p[1] - '0';} | |
6ab02e3f | 444 | else {*c |= toupper(qp_p[1]) - 'A' + 10;} |
80a47a2c | 445 | return qp_p + 2; |
6ab02e3f | 446 | } |
80a47a2c TK |
447 | |
448 | /* Illegal char here */ | |
449 | *c = PDKIM_QP_ERROR_DECODE; | |
450 | return initial_pos; | |
451 | } | |
452 | ||
453 | ||
454 | /* -------------------------------------------------------------------------- */ | |
455 | char *pdkim_decode_qp(char *str) { | |
456 | int nchar = 0; | |
457 | char *q; | |
458 | char *p = str; | |
459 | char *n = malloc(strlen(p)+1); | |
460 | if (n == NULL) return NULL; | |
461 | *n = '\0'; | |
462 | q = n; | |
463 | while (*p != '\0') { | |
464 | if (*p == '=') { | |
465 | p = pdkim_decode_qp_char(p,&nchar); | |
466 | if (nchar >= 0) { | |
467 | *q = nchar; | |
468 | q++; | |
469 | continue; | |
470 | } | |
471 | } | |
472 | else { | |
473 | *q = *p; | |
474 | q++; | |
475 | } | |
476 | p++; | |
477 | } | |
478 | *q = '\0'; | |
479 | return n; | |
480 | } | |
481 | ||
482 | ||
483 | /* -------------------------------------------------------------------------- */ | |
484 | char *pdkim_decode_base64(char *str, int *num_decoded) { | |
485 | int dlen = 0; | |
486 | char *res; | |
487 | ||
488 | base64_decode(NULL, &dlen, (unsigned char *)str, strlen(str)); | |
489 | res = malloc(dlen+1); | |
490 | if (res == NULL) return NULL; | |
491 | if (base64_decode((unsigned char *)res,&dlen,(unsigned char *)str,strlen(str)) != 0) { | |
492 | free(res); | |
493 | return NULL; | |
494 | } | |
495 | if (num_decoded != NULL) *num_decoded = dlen; | |
496 | return res; | |
497 | } | |
498 | ||
499 | /* -------------------------------------------------------------------------- */ | |
500 | char *pdkim_encode_base64(char *str, int num) { | |
501 | int dlen = 0; | |
502 | char *res; | |
503 | ||
504 | base64_encode(NULL, &dlen, (unsigned char *)str, num); | |
505 | res = malloc(dlen+1); | |
506 | if (res == NULL) return NULL; | |
507 | if (base64_encode((unsigned char *)res,&dlen,(unsigned char *)str,num) != 0) { | |
508 | free(res); | |
509 | return NULL; | |
510 | } | |
511 | return res; | |
512 | } | |
513 | ||
514 | ||
515 | /* -------------------------------------------------------------------------- */ | |
516 | #define PDKIM_HDR_LIMBO 0 | |
517 | #define PDKIM_HDR_TAG 1 | |
518 | #define PDKIM_HDR_VALUE 2 | |
519 | pdkim_signature *pdkim_parse_sig_header(pdkim_ctx *ctx, char *raw_hdr) { | |
520 | pdkim_signature *sig ; | |
521 | char *p,*q; | |
522 | pdkim_str *cur_tag = NULL; | |
523 | pdkim_str *cur_val = NULL; | |
524 | int past_hname = 0; | |
525 | int in_b_val = 0; | |
526 | int where = PDKIM_HDR_LIMBO; | |
527 | int i; | |
528 | ||
529 | sig = malloc(sizeof(pdkim_signature)); | |
530 | if (sig == NULL) return NULL; | |
531 | memset(sig,0,sizeof(pdkim_signature)); | |
532 | sig->bodylength = -1; | |
533 | ||
534 | sig->rawsig_no_b_val = malloc(strlen(raw_hdr)+1); | |
535 | if (sig->rawsig_no_b_val == NULL) { | |
536 | free(sig); | |
537 | return NULL; | |
538 | } | |
539 | ||
540 | p = raw_hdr; | |
541 | q = sig->rawsig_no_b_val; | |
542 | ||
543 | while (1) { | |
544 | ||
545 | /* Ignore FWS */ | |
546 | if ( (*p == '\r') || (*p == '\n') ) | |
547 | goto NEXT_CHAR; | |
548 | ||
549 | /* Fast-forward through header name */ | |
550 | if (!past_hname) { | |
551 | if (*p == ':') past_hname = 1; | |
552 | goto NEXT_CHAR; | |
553 | } | |
554 | ||
555 | if (where == PDKIM_HDR_LIMBO) { | |
556 | /* In limbo, just wait for a tag-char to appear */ | |
557 | if (!((*p >= 'a') && (*p <= 'z'))) | |
558 | goto NEXT_CHAR; | |
559 | ||
560 | where = PDKIM_HDR_TAG; | |
561 | } | |
562 | ||
563 | if (where == PDKIM_HDR_TAG) { | |
564 | if (cur_tag == NULL) | |
565 | cur_tag = pdkim_strnew(NULL); | |
566 | ||
567 | if ((*p >= 'a') && (*p <= 'z')) | |
568 | pdkim_strncat(cur_tag,p,1); | |
569 | ||
570 | if (*p == '=') { | |
571 | if (strcmp(cur_tag->str,"b") == 0) { | |
572 | *q = '='; q++; | |
573 | in_b_val = 1; | |
574 | } | |
575 | where = PDKIM_HDR_VALUE; | |
576 | goto NEXT_CHAR; | |
577 | } | |
578 | } | |
579 | ||
580 | if (where == PDKIM_HDR_VALUE) { | |
581 | if (cur_val == NULL) | |
582 | cur_val = pdkim_strnew(NULL); | |
583 | ||
584 | if ( (*p == '\r') || (*p == '\n') || (*p == ' ') || (*p == '\t') ) | |
585 | goto NEXT_CHAR; | |
586 | ||
587 | if ( (*p == ';') || (*p == '\0') ) { | |
588 | if (cur_tag->len > 0) { | |
589 | pdkim_strtrim(cur_val); | |
590 | #ifdef PDKIM_DEBUG | |
591 | if (ctx->debug_stream) | |
592 | fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str); | |
593 | #endif | |
594 | switch (cur_tag->str[0]) { | |
595 | case 'b': | |
596 | switch (cur_tag->str[1]) { | |
597 | case 'h': | |
598 | sig->bodyhash = pdkim_decode_base64(cur_val->str,&(sig->bodyhash_len)); | |
599 | break; | |
600 | default: | |
601 | sig->sigdata = pdkim_decode_base64(cur_val->str,&(sig->sigdata_len)); | |
602 | break; | |
603 | } | |
604 | break; | |
605 | case 'v': | |
606 | if (strcmp(cur_val->str,PDKIM_SIGNATURE_VERSION) == 0) { | |
607 | /* We only support version 1, and that is currently the | |
608 | only version there is. */ | |
609 | sig->version = 1; | |
610 | } | |
611 | break; | |
612 | case 'a': | |
613 | i = 0; | |
614 | while (pdkim_algos[i] != NULL) { | |
615 | if (strcmp(cur_val->str,pdkim_algos[i]) == 0 ) { | |
616 | sig->algo = i; | |
617 | break; | |
618 | } | |
619 | i++; | |
620 | } | |
621 | break; | |
622 | case 'c': | |
623 | i = 0; | |
624 | while (pdkim_combined_canons[i].str != NULL) { | |
625 | if (strcmp(cur_val->str,pdkim_combined_canons[i].str) == 0 ) { | |
626 | sig->canon_headers = pdkim_combined_canons[i].canon_headers; | |
627 | sig->canon_body = pdkim_combined_canons[i].canon_body; | |
628 | break; | |
629 | } | |
630 | i++; | |
631 | } | |
632 | break; | |
633 | case 'q': | |
634 | i = 0; | |
635 | while (pdkim_querymethods[i] != NULL) { | |
636 | if (strcmp(cur_val->str,pdkim_querymethods[i]) == 0 ) { | |
637 | sig->querymethod = i; | |
638 | break; | |
639 | } | |
640 | i++; | |
641 | } | |
642 | break; | |
643 | case 's': | |
644 | sig->selector = strdup(cur_val->str); | |
645 | break; | |
646 | case 'd': | |
647 | sig->domain = strdup(cur_val->str); | |
648 | break; | |
649 | case 'i': | |
650 | sig->identity = pdkim_decode_qp(cur_val->str); | |
651 | break; | |
652 | case 't': | |
653 | sig->created = strtoul(cur_val->str,NULL,10); | |
654 | break; | |
655 | case 'x': | |
656 | sig->expires = strtoul(cur_val->str,NULL,10); | |
657 | break; | |
658 | case 'l': | |
659 | sig->bodylength = strtol(cur_val->str,NULL,10); | |
660 | break; | |
661 | case 'h': | |
662 | sig->headernames = strdup(cur_val->str); | |
663 | break; | |
664 | case 'z': | |
665 | sig->copiedheaders = pdkim_decode_qp(cur_val->str); | |
666 | break; | |
667 | default: | |
668 | #ifdef PDKIM_DEBUG | |
669 | if (ctx->debug_stream) | |
670 | fprintf(ctx->debug_stream, "Unknown tag encountered\n"); | |
671 | #endif | |
672 | break; | |
673 | } | |
674 | } | |
675 | pdkim_strclear(cur_tag); | |
676 | pdkim_strclear(cur_val); | |
677 | in_b_val = 0; | |
678 | where = PDKIM_HDR_LIMBO; | |
679 | goto NEXT_CHAR; | |
680 | } | |
681 | else pdkim_strncat(cur_val,p,1); | |
682 | } | |
683 | ||
684 | NEXT_CHAR: | |
685 | if (*p == '\0') break; | |
686 | ||
687 | if (!in_b_val) { | |
688 | *q = *p; | |
689 | q++; | |
690 | } | |
691 | p++; | |
692 | } | |
693 | ||
694 | /* Make sure the most important bits are there. */ | |
695 | if (!(sig->domain && (*(sig->domain) != '\0') && | |
696 | sig->selector && (*(sig->selector) != '\0') && | |
697 | sig->headernames && (*(sig->headernames) != '\0') && | |
698 | sig->bodyhash && | |
699 | sig->sigdata && | |
700 | sig->version)) { | |
701 | pdkim_free_sig(sig); | |
702 | return NULL; | |
703 | } | |
704 | ||
705 | /* Copy header list to 'tick-off' header list */ | |
706 | sig->hnames_check = strdup(sig->headernames); | |
707 | ||
708 | *q = '\0'; | |
709 | /* Chomp raw header. The final newline must not be added to the signature. */ | |
710 | q--; | |
711 | while( (q > sig->rawsig_no_b_val) && ((*q == '\r') || (*q == '\n')) ) { | |
712 | *q = '\0'; q--; | |
713 | } | |
714 | ||
715 | #ifdef PDKIM_DEBUG | |
716 | if (ctx->debug_stream) { | |
717 | fprintf(ctx->debug_stream, | |
718 | "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
719 | pdkim_quoteprint(ctx->debug_stream, | |
720 | sig->rawsig_no_b_val, | |
721 | strlen(sig->rawsig_no_b_val), 1); | |
722 | fprintf(ctx->debug_stream, | |
723 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
724 | } | |
725 | #endif | |
726 | ||
727 | sig->sha1_body = malloc(sizeof(sha1_context)); | |
728 | if (sig->sha1_body == NULL) { | |
729 | pdkim_free_sig(sig); | |
730 | return NULL; | |
731 | } | |
732 | sig->sha2_body = malloc(sizeof(sha2_context)); | |
733 | if (sig->sha2_body == NULL) { | |
734 | pdkim_free_sig(sig); | |
735 | return NULL; | |
736 | } | |
737 | ||
738 | sha1_starts(sig->sha1_body); | |
739 | sha2_starts(sig->sha2_body,0); | |
740 | ||
741 | return sig; | |
742 | } | |
743 | ||
744 | ||
745 | /* -------------------------------------------------------------------------- */ | |
746 | pdkim_pubkey *pdkim_parse_pubkey_record(pdkim_ctx *ctx, char *raw_record) { | |
747 | pdkim_pubkey *pub ; | |
748 | char *p; | |
749 | pdkim_str *cur_tag = NULL; | |
750 | pdkim_str *cur_val = NULL; | |
751 | int where = PDKIM_HDR_LIMBO; | |
752 | ||
753 | pub = malloc(sizeof(pdkim_pubkey)); | |
754 | if (pub == NULL) return NULL; | |
755 | memset(pub,0,sizeof(pdkim_pubkey)); | |
756 | ||
757 | p = raw_record; | |
758 | ||
759 | while (1) { | |
760 | ||
761 | /* Ignore FWS */ | |
762 | if ( (*p == '\r') || (*p == '\n') ) | |
763 | goto NEXT_CHAR; | |
764 | ||
765 | if (where == PDKIM_HDR_LIMBO) { | |
766 | /* In limbo, just wait for a tag-char to appear */ | |
767 | if (!((*p >= 'a') && (*p <= 'z'))) | |
768 | goto NEXT_CHAR; | |
769 | ||
770 | where = PDKIM_HDR_TAG; | |
771 | } | |
772 | ||
773 | if (where == PDKIM_HDR_TAG) { | |
774 | if (cur_tag == NULL) | |
775 | cur_tag = pdkim_strnew(NULL); | |
776 | ||
777 | if ((*p >= 'a') && (*p <= 'z')) | |
778 | pdkim_strncat(cur_tag,p,1); | |
779 | ||
780 | if (*p == '=') { | |
781 | where = PDKIM_HDR_VALUE; | |
782 | goto NEXT_CHAR; | |
783 | } | |
784 | } | |
785 | ||
786 | if (where == PDKIM_HDR_VALUE) { | |
787 | if (cur_val == NULL) | |
788 | cur_val = pdkim_strnew(NULL); | |
789 | ||
790 | if ( (*p == '\r') || (*p == '\n') ) | |
791 | goto NEXT_CHAR; | |
792 | ||
793 | if ( (*p == ';') || (*p == '\0') ) { | |
794 | if (cur_tag->len > 0) { | |
795 | pdkim_strtrim(cur_val); | |
796 | #ifdef PDKIM_DEBUG | |
797 | if (ctx->debug_stream) | |
798 | fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str); | |
799 | #endif | |
800 | switch (cur_tag->str[0]) { | |
801 | case 'v': | |
802 | /* This tag isn't evaluated because: | |
803 | - We only support version DKIM1. | |
804 | - Which is the default for this value (set below) | |
805 | - Other versions are currently not specified. */ | |
806 | break; | |
807 | case 'h': | |
808 | pub->hashes = strdup(cur_val->str); | |
809 | break; | |
810 | case 'g': | |
811 | pub->granularity = strdup(cur_val->str); | |
812 | break; | |
813 | case 'n': | |
814 | pub->notes = pdkim_decode_qp(cur_val->str); | |
815 | break; | |
816 | case 'p': | |
817 | pub->key = pdkim_decode_base64(cur_val->str,&(pub->key_len)); | |
818 | break; | |
819 | case 'k': | |
820 | pub->hashes = strdup(cur_val->str); | |
821 | break; | |
822 | case 's': | |
823 | pub->srvtype = strdup(cur_val->str); | |
824 | break; | |
825 | case 't': | |
67932e54 | 826 | if (strchr(cur_val->str,'y') != NULL) pub->testing = 1; |
80a47a2c TK |
827 | if (strchr(cur_val->str,'s') != NULL) pub->no_subdomaining = 1; |
828 | break; | |
829 | default: | |
830 | #ifdef PDKIM_DEBUG | |
831 | if (ctx->debug_stream) | |
832 | fprintf(ctx->debug_stream, "Unknown tag encountered\n"); | |
833 | #endif | |
834 | break; | |
835 | } | |
836 | } | |
837 | pdkim_strclear(cur_tag); | |
838 | pdkim_strclear(cur_val); | |
839 | where = PDKIM_HDR_LIMBO; | |
840 | goto NEXT_CHAR; | |
841 | } | |
842 | else pdkim_strncat(cur_val,p,1); | |
843 | } | |
844 | ||
845 | NEXT_CHAR: | |
846 | if (*p == '\0') break; | |
847 | p++; | |
848 | } | |
849 | ||
850 | /* Set fallback defaults */ | |
851 | if (pub->version == NULL) pub->version = strdup(PDKIM_PUB_RECORD_VERSION); | |
852 | if (pub->granularity == NULL) pub->granularity = strdup("*"); | |
853 | if (pub->keytype == NULL) pub->keytype = strdup("rsa"); | |
854 | if (pub->srvtype == NULL) pub->srvtype = strdup("*"); | |
855 | ||
856 | /* p= is required */ | |
857 | if (pub->key == NULL) { | |
858 | pdkim_free_pubkey(pub); | |
859 | return NULL; | |
860 | } | |
861 | ||
862 | return pub; | |
863 | } | |
864 | ||
865 | ||
866 | /* -------------------------------------------------------------------------- */ | |
867 | int pdkim_update_bodyhash(pdkim_ctx *ctx, char *data, int len) { | |
868 | pdkim_signature *sig = ctx->sig; | |
869 | /* Cache relaxed version of data */ | |
870 | char *relaxed_data = NULL; | |
871 | int relaxed_len = 0; | |
872 | ||
873 | /* Traverse all signatures, updating their hashes. */ | |
874 | while (sig != NULL) { | |
875 | /* Defaults to simple canon (no further treatment necessary) */ | |
876 | char *canon_data = data; | |
877 | int canon_len = len; | |
878 | ||
879 | if (sig->canon_body == PDKIM_CANON_RELAXED) { | |
880 | /* Relax the line if not done already */ | |
881 | if (relaxed_data == NULL) { | |
882 | int seen_wsp = 0; | |
883 | char *p = data; | |
884 | int q = 0; | |
885 | relaxed_data = malloc(len+1); | |
886 | if (relaxed_data == NULL) return PDKIM_ERR_OOM; | |
887 | while (*p != '\0') { | |
888 | char c = *p; | |
c2b89b98 TK |
889 | if (c == '\r') { |
890 | if ( (q > 0) && (relaxed_data[q-1] == ' ') ) q--; | |
891 | } | |
892 | else if ( (c == '\t') || (c == ' ') ) { | |
80a47a2c TK |
893 | c = ' '; /* Turns WSP into SP */ |
894 | if (seen_wsp) { | |
895 | p++; | |
896 | continue; | |
897 | } | |
898 | else seen_wsp = 1; | |
899 | } | |
900 | else seen_wsp = 0; | |
901 | relaxed_data[q++] = c; | |
902 | p++; | |
903 | } | |
904 | relaxed_data[q] = '\0'; | |
905 | relaxed_len = q; | |
906 | } | |
907 | canon_data = relaxed_data; | |
908 | canon_len = relaxed_len; | |
909 | } | |
910 | ||
911 | /* Make sure we don't exceed the to-be-signed body length */ | |
912 | if ((sig->bodylength >= 0) && | |
913 | ((sig->signed_body_bytes+(unsigned long)canon_len) > sig->bodylength)) | |
914 | canon_len = (sig->bodylength - sig->signed_body_bytes); | |
915 | ||
916 | if (canon_len > 0) { | |
917 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
918 | sha1_update(sig->sha1_body,(unsigned char *)canon_data,canon_len); | |
919 | else | |
920 | sha2_update(sig->sha2_body,(unsigned char *)canon_data,canon_len); | |
921 | sig->signed_body_bytes += canon_len; | |
922 | #ifdef PDKIM_DEBUG | |
923 | if (ctx->debug_stream!=NULL) | |
924 | pdkim_quoteprint(ctx->debug_stream,canon_data,canon_len,0); | |
925 | #endif | |
926 | } | |
927 | ||
928 | sig = sig->next; | |
929 | } | |
930 | ||
931 | if (relaxed_data != NULL) free(relaxed_data); | |
932 | return PDKIM_OK; | |
6ab02e3f | 933 | } |
80a47a2c TK |
934 | |
935 | ||
936 | /* -------------------------------------------------------------------------- */ | |
937 | int pdkim_finish_bodyhash(pdkim_ctx *ctx) { | |
938 | pdkim_signature *sig = ctx->sig; | |
939 | ||
940 | /* Traverse all signatures */ | |
941 | while (sig != NULL) { | |
942 | ||
943 | /* Finish hashes */ | |
944 | unsigned char bh[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */ | |
945 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
946 | sha1_finish(sig->sha1_body,bh); | |
947 | else | |
948 | sha2_finish(sig->sha2_body,bh); | |
949 | ||
950 | #ifdef PDKIM_DEBUG | |
951 | if (ctx->debug_stream) { | |
952 | fprintf(ctx->debug_stream, "PDKIM [%s] Body bytes hashed: %lu\n", | |
953 | sig->domain, sig->signed_body_bytes); | |
954 | fprintf(ctx->debug_stream, "PDKIM [%s] bh computed: ", sig->domain); | |
955 | pdkim_hexprint(ctx->debug_stream, (char *)bh, | |
956 | (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1); | |
957 | } | |
958 | #endif | |
959 | ||
960 | /* SIGNING -------------------------------------------------------------- */ | |
961 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
962 | sig->bodyhash_len = (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32; | |
963 | sig->bodyhash = malloc(sig->bodyhash_len); | |
964 | if (sig->bodyhash == NULL) return PDKIM_ERR_OOM; | |
965 | memcpy(sig->bodyhash,bh,sig->bodyhash_len); | |
966 | ||
967 | /* If bodylength limit is set, and we have received less bytes | |
968 | than the requested amount, effectively remove the limit tag. */ | |
969 | if (sig->signed_body_bytes < sig->bodylength) sig->bodylength = -1; | |
970 | } | |
971 | /* VERIFICATION --------------------------------------------------------- */ | |
972 | else { | |
973 | /* Compare bodyhash */ | |
974 | if (memcmp(bh,sig->bodyhash, | |
975 | (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32) == 0) { | |
976 | #ifdef PDKIM_DEBUG | |
977 | if (ctx->debug_stream) | |
978 | fprintf(ctx->debug_stream, "PDKIM [%s] Body hash verified OK\n", | |
979 | sig->domain); | |
980 | #endif | |
981 | } | |
982 | else { | |
983 | #ifdef PDKIM_DEBUG | |
984 | if (ctx->debug_stream) { | |
985 | fprintf(ctx->debug_stream, "PDKIM [%s] Body hash did NOT verify\n", | |
986 | sig->domain); | |
987 | fprintf(ctx->debug_stream, "PDKIM [%s] bh signature: ", sig->domain); | |
988 | pdkim_hexprint(ctx->debug_stream, sig->bodyhash, | |
989 | (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1); | |
990 | } | |
991 | #endif | |
992 | sig->verify_status = PDKIM_VERIFY_FAIL; | |
993 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY; | |
994 | } | |
995 | } | |
996 | ||
997 | sig = sig->next; | |
998 | } | |
999 | ||
1000 | return PDKIM_OK; | |
6ab02e3f | 1001 | } |
80a47a2c TK |
1002 | |
1003 | ||
1004 | ||
1005 | /* -------------------------------------------------------------------------- */ | |
1006 | /* Callback from pdkim_feed below for processing complete body lines */ | |
1007 | int pdkim_bodyline_complete(pdkim_ctx *ctx) { | |
1008 | char *p = ctx->linebuf; | |
1009 | int n = ctx->linebuf_offset; | |
1010 | ||
1011 | /* Ignore extra data if we've seen the end-of-data marker */ | |
1012 | if (ctx->seen_eod) goto BAIL; | |
1013 | ||
1014 | /* We've always got one extra byte to stuff a zero ... */ | |
1015 | ctx->linebuf[(ctx->linebuf_offset)] = '\0'; | |
1016 | ||
1017 | if (ctx->input_mode == PDKIM_INPUT_SMTP) { | |
1018 | /* Terminate on EOD marker */ | |
1019 | if (memcmp(p,".\r\n",3) == 0) { | |
1020 | ctx->seen_eod = 1; | |
1021 | goto BAIL; | |
1022 | } | |
1023 | /* Unstuff dots */ | |
1024 | if (memcmp(p,"..",2) == 0) { | |
1025 | p++; | |
1026 | n--; | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | /* Empty lines need to be buffered until we find a non-empty line */ | |
1031 | if (memcmp(p,"\r\n",2) == 0) { | |
1032 | ctx->num_buffered_crlf++; | |
1033 | goto BAIL; | |
1034 | } | |
1035 | ||
1036 | /* At this point, we have a non-empty line, so release the buffered ones. */ | |
1037 | while (ctx->num_buffered_crlf) { | |
1038 | pdkim_update_bodyhash(ctx,"\r\n",2); | |
1039 | ctx->num_buffered_crlf--; | |
1040 | } | |
1041 | ||
1042 | pdkim_update_bodyhash(ctx,p,n); | |
1043 | ||
1044 | BAIL: | |
1045 | ctx->linebuf_offset = 0; | |
1046 | return PDKIM_OK; | |
1047 | } | |
1048 | ||
1049 | ||
1050 | /* -------------------------------------------------------------------------- */ | |
1051 | /* Callback from pdkim_feed below for processing complete headers */ | |
1052 | #define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:" | |
1053 | int pdkim_header_complete(pdkim_ctx *ctx) { | |
1054 | pdkim_signature *sig = ctx->sig; | |
1055 | ||
1056 | /* Special case: The last header can have an extra \r appended */ | |
1057 | if ( (ctx->cur_header->len > 1) && | |
1058 | (ctx->cur_header->str[(ctx->cur_header->len)-1] == '\r') ) { | |
1059 | ctx->cur_header->str[(ctx->cur_header->len)-1] = '\0'; | |
1060 | ctx->cur_header->len--; | |
1061 | } | |
1062 | ||
1063 | ctx->num_headers++; | |
1064 | if (ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL; | |
1065 | ||
1066 | /* Traverse all signatures */ | |
1067 | while (sig != NULL) { | |
1068 | pdkim_stringlist *list; | |
1069 | ||
1070 | /* SIGNING -------------------------------------------------------------- */ | |
1071 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1072 | if (header_name_match(ctx->cur_header->str, | |
1073 | sig->sign_headers? | |
1074 | sig->sign_headers: | |
1075 | PDKIM_DEFAULT_SIGN_HEADERS, 0) != PDKIM_OK) goto NEXT_SIG; | |
1076 | } | |
1077 | /* VERIFICATION --------------------------------------------------------- */ | |
1078 | else { | |
1079 | /* Header is not included or all instances were already 'ticked off' */ | |
1080 | if (header_name_match(ctx->cur_header->str, | |
1081 | sig->hnames_check, 1) != PDKIM_OK) goto NEXT_SIG; | |
1082 | } | |
1083 | ||
97713345 TK |
1084 | /* Add header to the signed headers list (in reverse order) */ |
1085 | list = pdkim_prepend_stringlist(sig->headers, | |
1086 | ctx->cur_header->str); | |
80a47a2c TK |
1087 | if (list == NULL) return PDKIM_ERR_OOM; |
1088 | sig->headers = list; | |
1089 | ||
1090 | NEXT_SIG: | |
1091 | sig = sig->next; | |
1092 | } | |
1093 | ||
1094 | /* DKIM-Signature: headers are added to the verification list */ | |
1095 | if ( (ctx->mode == PDKIM_MODE_VERIFY) && | |
1096 | (strncasecmp(ctx->cur_header->str, | |
1097 | DKIM_SIGNATURE_HEADERNAME, | |
1098 | strlen(DKIM_SIGNATURE_HEADERNAME)) == 0) ) { | |
1099 | pdkim_signature *new_sig; | |
1100 | /* Create and chain new signature block */ | |
1101 | #ifdef PDKIM_DEBUG | |
1102 | if (ctx->debug_stream) | |
1103 | fprintf(ctx->debug_stream, | |
1104 | "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1105 | #endif | |
1106 | new_sig = pdkim_parse_sig_header(ctx, ctx->cur_header->str); | |
1107 | if (new_sig != NULL) { | |
1108 | pdkim_signature *last_sig = ctx->sig; | |
1109 | if (last_sig == NULL) { | |
1110 | ctx->sig = new_sig; | |
1111 | } | |
1112 | else { | |
6ab02e3f | 1113 | while (last_sig->next != NULL) { last_sig = last_sig->next; } |
80a47a2c TK |
1114 | last_sig->next = new_sig; |
1115 | } | |
1116 | } | |
1117 | else { | |
1118 | #ifdef PDKIM_DEBUG | |
1119 | if (ctx->debug_stream) { | |
1120 | fprintf(ctx->debug_stream,"Error while parsing signature header\n"); | |
1121 | fprintf(ctx->debug_stream, | |
1122 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1123 | } | |
1124 | #endif | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | BAIL: | |
1129 | pdkim_strclear(ctx->cur_header); /* Re-use existing pdkim_str */ | |
1130 | return PDKIM_OK; | |
6ab02e3f | 1131 | } |
80a47a2c TK |
1132 | |
1133 | ||
1134 | ||
1135 | /* -------------------------------------------------------------------------- */ | |
1136 | #define HEADER_BUFFER_FRAG_SIZE 256 | |
1137 | DLLEXPORT int pdkim_feed (pdkim_ctx *ctx, | |
1138 | char *data, | |
1139 | int len) { | |
1140 | int p; | |
1141 | for (p=0;p<len;p++) { | |
1142 | char c = data[p]; | |
1143 | if (ctx->past_headers) { | |
1144 | /* Processing body byte */ | |
1145 | ctx->linebuf[(ctx->linebuf_offset)++] = c; | |
1146 | if (c == '\n') { | |
1147 | int rc = pdkim_bodyline_complete(ctx); /* End of line */ | |
1148 | if (rc != PDKIM_OK) return rc; | |
1149 | } | |
1150 | if (ctx->linebuf_offset == (PDKIM_MAX_BODY_LINE_LEN-1)) | |
1151 | return PDKIM_ERR_LONG_LINE; | |
1152 | } | |
1153 | else { | |
1154 | /* Processing header byte */ | |
1155 | if (c != '\r') { | |
1156 | if (c == '\n') { | |
1157 | if (ctx->seen_lf) { | |
1158 | int rc = pdkim_header_complete(ctx); /* Seen last header line */ | |
1159 | if (rc != PDKIM_OK) return rc; | |
1160 | ctx->past_headers = 1; | |
1161 | ctx->seen_lf = 0; | |
1162 | #ifdef PDKIM_DEBUG | |
1163 | if (ctx->debug_stream) | |
1164 | fprintf(ctx->debug_stream, | |
1165 | "PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1166 | #endif | |
1167 | continue; | |
1168 | } | |
1169 | else ctx->seen_lf = 1; | |
1170 | } | |
1171 | else if (ctx->seen_lf) { | |
1172 | if (! ((c == '\t') || (c == ' '))) { | |
1173 | int rc = pdkim_header_complete(ctx); /* End of header */ | |
1174 | if (rc != PDKIM_OK) return rc; | |
1175 | } | |
1176 | ctx->seen_lf = 0; | |
1177 | } | |
1178 | } | |
1179 | if (ctx->cur_header == NULL) { | |
1180 | ctx->cur_header = pdkim_strnew(NULL); | |
1181 | if (ctx->cur_header == NULL) return PDKIM_ERR_OOM; | |
1182 | } | |
1183 | if (ctx->cur_header->len < PDKIM_MAX_HEADER_LEN) | |
1184 | if (pdkim_strncat(ctx->cur_header,&data[p],1) == NULL) | |
1185 | return PDKIM_ERR_OOM; | |
1186 | } | |
1187 | } | |
1188 | return PDKIM_OK; | |
6ab02e3f | 1189 | } |
80a47a2c TK |
1190 | |
1191 | ||
1192 | /* -------------------------------------------------------------------------- */ | |
1193 | char *pdkim_create_header(pdkim_signature *sig, int final) { | |
1194 | char *rc = NULL; | |
1195 | char *base64_bh = NULL; | |
1196 | char *base64_b = NULL; | |
1197 | pdkim_str *hdr = pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION); | |
1198 | if (hdr == NULL) return NULL; | |
1199 | ||
1200 | base64_bh = pdkim_encode_base64(sig->bodyhash, sig->bodyhash_len); | |
1201 | if (base64_bh == NULL) goto BAIL; | |
1202 | ||
1203 | /* Required and static bits */ | |
1204 | if ( | |
1205 | pdkim_strcat(hdr,"; a=") && | |
1206 | pdkim_strcat(hdr,pdkim_algos[sig->algo]) && | |
1207 | pdkim_strcat(hdr,"; q=") && | |
1208 | pdkim_strcat(hdr,pdkim_querymethods[sig->querymethod]) && | |
1209 | pdkim_strcat(hdr,"; c=") && | |
1210 | pdkim_strcat(hdr,pdkim_canons[sig->canon_headers]) && | |
1211 | pdkim_strcat(hdr,"/") && | |
1212 | pdkim_strcat(hdr,pdkim_canons[sig->canon_body]) && | |
1213 | pdkim_strcat(hdr,"; d=") && | |
1214 | pdkim_strcat(hdr,sig->domain) && | |
1215 | pdkim_strcat(hdr,"; s=") && | |
1216 | pdkim_strcat(hdr,sig->selector) && | |
1217 | pdkim_strcat(hdr,";\r\n\th=") && | |
1218 | pdkim_strcat(hdr,sig->headernames) && | |
1219 | pdkim_strcat(hdr,"; bh=") && | |
1220 | pdkim_strcat(hdr,base64_bh) && | |
1221 | pdkim_strcat(hdr,";\r\n\t") | |
1222 | ) { | |
1223 | /* Optional bits */ | |
1224 | if (sig->identity != NULL) { | |
1225 | if (!( pdkim_strcat(hdr,"i=") && | |
1226 | pdkim_strcat(hdr,sig->identity) && | |
1227 | pdkim_strcat(hdr,";") ) ) { | |
1228 | goto BAIL; | |
1229 | } | |
1230 | } | |
1231 | if (sig->created > 0) { | |
1232 | if (!( pdkim_strcat(hdr,"t=") && | |
1233 | pdkim_numcat(hdr,sig->created) && | |
1234 | pdkim_strcat(hdr,";") ) ) { | |
1235 | goto BAIL; | |
1236 | } | |
1237 | } | |
1238 | if (sig->expires > 0) { | |
1239 | if (!( pdkim_strcat(hdr,"x=") && | |
1240 | pdkim_numcat(hdr,sig->expires) && | |
1241 | pdkim_strcat(hdr,";") ) ) { | |
1242 | goto BAIL; | |
1243 | } | |
1244 | } | |
1245 | if (sig->bodylength >= 0) { | |
1246 | if (!( pdkim_strcat(hdr,"l=") && | |
1247 | pdkim_numcat(hdr,sig->bodylength) && | |
1248 | pdkim_strcat(hdr,";") ) ) { | |
1249 | goto BAIL; | |
1250 | } | |
1251 | } | |
1252 | /* Extra linebreak */ | |
1253 | if (hdr->str[(hdr->len)-1] == ';') { | |
1254 | if (!pdkim_strcat(hdr," \r\n\t")) goto BAIL; | |
1255 | } | |
1256 | /* Preliminary or final version? */ | |
1257 | if (final) { | |
1258 | base64_b = pdkim_encode_base64(sig->sigdata, sig->sigdata_len); | |
1259 | if (base64_b == NULL) goto BAIL; | |
1260 | if ( | |
1261 | pdkim_strcat(hdr,"b=") && | |
1262 | pdkim_strcat(hdr,base64_b) && | |
1263 | pdkim_strcat(hdr,";") | |
1264 | ) goto DONE; | |
1265 | } | |
1266 | else { | |
1267 | if (pdkim_strcat(hdr,"b=;")) goto DONE; | |
1268 | } | |
1269 | ||
1270 | goto BAIL; | |
1271 | } | |
1272 | ||
1273 | DONE: | |
1274 | rc = strdup(hdr->str); | |
1275 | ||
1276 | BAIL: | |
1277 | pdkim_strfree(hdr); | |
1278 | if (base64_bh != NULL) free(base64_bh); | |
1279 | if (base64_b != NULL) free(base64_b); | |
1280 | return rc; | |
1281 | } | |
1282 | ||
1283 | ||
1284 | /* -------------------------------------------------------------------------- */ | |
1285 | DLLEXPORT int pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatures) { | |
1286 | pdkim_signature *sig = ctx->sig; | |
1287 | pdkim_str *headernames = NULL; /* Collected signed header names */ | |
1288 | ||
1289 | /* Check if we must still flush a (partial) header. If that is the | |
1290 | case, the message has no body, and we must compute a body hash | |
1291 | out of '<CR><LF>' */ | |
90204638 | 1292 | if (ctx->cur_header && ctx->cur_header->len) { |
80a47a2c TK |
1293 | int rc = pdkim_header_complete(ctx); |
1294 | if (rc != PDKIM_OK) return rc; | |
1295 | pdkim_update_bodyhash(ctx,"\r\n",2); | |
1296 | } | |
1297 | else { | |
1298 | /* For non-smtp input, check if there's an unfinished line in the | |
1299 | body line buffer. If that is the case, we must add a CRLF to the | |
1300 | hash to properly terminate the message. */ | |
1301 | if ((ctx->input_mode == PDKIM_INPUT_NORMAL) && ctx->linebuf_offset) { | |
1302 | pdkim_update_bodyhash(ctx, ctx->linebuf, ctx->linebuf_offset); | |
1303 | pdkim_update_bodyhash(ctx,"\r\n",2); | |
1304 | } | |
1305 | #ifdef PDKIM_DEBUG | |
1306 | if (ctx->debug_stream) | |
1307 | fprintf(ctx->debug_stream, | |
8fd6966b | 1308 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c TK |
1309 | #endif |
1310 | } | |
1311 | ||
1312 | /* Build (and/or evaluate) body hash */ | |
1313 | if (pdkim_finish_bodyhash(ctx) != PDKIM_OK) return PDKIM_ERR_OOM; | |
1314 | ||
1315 | /* SIGNING -------------------------------------------------------------- */ | |
1316 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1317 | headernames = pdkim_strnew(NULL); | |
1318 | if (headernames == NULL) return PDKIM_ERR_OOM; | |
1319 | } | |
1320 | /* ---------------------------------------------------------------------- */ | |
1321 | ||
1322 | while (sig != NULL) { | |
1323 | sha1_context sha1_headers; | |
1324 | sha2_context sha2_headers; | |
1325 | char *sig_hdr; | |
1326 | char headerhash[32]; | |
1327 | ||
1328 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
1329 | sha1_starts(&sha1_headers); | |
1330 | else | |
1331 | sha2_starts(&sha2_headers,0); | |
1332 | ||
1333 | #ifdef PDKIM_DEBUG | |
1334 | if (ctx->debug_stream) | |
1335 | fprintf(ctx->debug_stream, | |
1336 | "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n"); | |
1337 | #endif | |
1338 | ||
1339 | /* SIGNING ---------------------------------------------------------------- */ | |
1340 | /* When signing, walk through our header list and add them to the hash. As we | |
1341 | go, construct a list of the header's names to use for the h= parameter. */ | |
1342 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1343 | pdkim_stringlist *p = sig->headers; | |
1344 | while (p != NULL) { | |
1345 | char *rh = NULL; | |
1346 | /* Collect header names (Note: colon presence is guaranteed here) */ | |
1347 | char *q = strchr(p->value,':'); | |
1348 | if (pdkim_strncat(headernames, p->value, | |
1349 | (q-(p->value))+((p->next==NULL)?0:1)) == NULL) | |
1350 | return PDKIM_ERR_OOM; | |
1351 | ||
1352 | if (sig->canon_headers == PDKIM_CANON_RELAXED) | |
1353 | rh = pdkim_relax_header(p->value,1); /* cook header for relaxed canon */ | |
1354 | else | |
1355 | rh = strdup(p->value); /* just copy it for simple canon */ | |
1356 | ||
1357 | if (rh == NULL) return PDKIM_ERR_OOM; | |
1358 | ||
1359 | /* Feed header to the hash algorithm */ | |
1360 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
1361 | sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh)); | |
1362 | else | |
1363 | sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh)); | |
1364 | #ifdef PDKIM_DEBUG | |
1365 | if (ctx->debug_stream) | |
1366 | pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1); | |
1367 | #endif | |
1368 | free(rh); | |
1369 | p = p->next; | |
1370 | } | |
1371 | } | |
1372 | /* VERIFICATION ----------------------------------------------------------- */ | |
1373 | /* When verifying, walk through the header name list in the h= parameter and | |
1374 | add the headers to the hash in that order. */ | |
1375 | else { | |
1376 | char *b = strdup(sig->headernames); | |
1377 | char *p = b; | |
1378 | char *q = NULL; | |
1379 | if (b == NULL) return PDKIM_ERR_OOM; | |
1380 | ||
1381 | while(1) { | |
1382 | pdkim_stringlist *hdrs = sig->headers; | |
1383 | q = strchr(p,':'); | |
1384 | if (q != NULL) *q = '\0'; | |
1385 | while (hdrs != NULL) { | |
97713345 TK |
1386 | if ( (strncasecmp(hdrs->value,p,strlen(p)) == 0) && |
1387 | ((hdrs->value)[strlen(p)] == ':') ) { | |
80a47a2c TK |
1388 | char *rh = NULL; |
1389 | if (sig->canon_headers == PDKIM_CANON_RELAXED) | |
1390 | rh = pdkim_relax_header(hdrs->value,1); /* cook header for relaxed canon */ | |
1391 | else | |
1392 | rh = strdup(hdrs->value); /* just copy it for simple canon */ | |
1393 | if (rh == NULL) return PDKIM_ERR_OOM; | |
1394 | /* Feed header to the hash algorithm */ | |
1395 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
1396 | sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh)); | |
1397 | else | |
1398 | sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh)); | |
1399 | #ifdef PDKIM_DEBUG | |
1400 | if (ctx->debug_stream) | |
1401 | pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1); | |
1402 | #endif | |
1403 | free(rh); | |
97713345 TK |
1404 | (hdrs->value)[0] = '_'; |
1405 | break; | |
80a47a2c TK |
1406 | } |
1407 | hdrs = hdrs->next; | |
1408 | } | |
1409 | if (q == NULL) break; | |
1410 | p = q+1; | |
1411 | } | |
1412 | free(b); | |
1413 | } | |
1414 | ||
1415 | #ifdef PDKIM_DEBUG | |
1416 | if (ctx->debug_stream) | |
1417 | fprintf(ctx->debug_stream, | |
1418 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1419 | #endif | |
1420 | ||
1421 | /* SIGNING ---------------------------------------------------------------- */ | |
1422 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1423 | /* Copy headernames to signature struct */ | |
1424 | sig->headernames = strdup(headernames->str); | |
1425 | pdkim_strfree(headernames); | |
1426 | ||
1427 | /* Create signature header with b= omitted */ | |
1428 | sig_hdr = pdkim_create_header(ctx->sig,0); | |
1429 | } | |
1430 | /* VERIFICATION ----------------------------------------------------------- */ | |
1431 | else { | |
1432 | sig_hdr = strdup(sig->rawsig_no_b_val); | |
1433 | } | |
1434 | /* ------------------------------------------------------------------------ */ | |
1435 | ||
1436 | if (sig_hdr == NULL) return PDKIM_ERR_OOM; | |
1437 | ||
1438 | /* Relax header if necessary */ | |
1439 | if (sig->canon_headers == PDKIM_CANON_RELAXED) { | |
1440 | char *relaxed_hdr = pdkim_relax_header(sig_hdr,0); | |
1441 | free(sig_hdr); | |
1442 | if (relaxed_hdr == NULL) return PDKIM_ERR_OOM; | |
1443 | sig_hdr = relaxed_hdr; | |
1444 | } | |
1445 | ||
1446 | #ifdef PDKIM_DEBUG | |
1447 | if (ctx->debug_stream) { | |
1448 | fprintf(ctx->debug_stream, | |
1449 | "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n"); | |
1450 | pdkim_quoteprint(ctx->debug_stream, sig_hdr, strlen(sig_hdr), 1); | |
1451 | fprintf(ctx->debug_stream, | |
1452 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1453 | } | |
1454 | #endif | |
1455 | ||
1456 | /* Finalize header hash */ | |
1457 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) { | |
1458 | sha1_update(&(sha1_headers),(unsigned char *)sig_hdr,strlen(sig_hdr)); | |
1459 | sha1_finish(&(sha1_headers),(unsigned char *)headerhash); | |
1460 | #ifdef PDKIM_DEBUG | |
1461 | if (ctx->debug_stream) { | |
1462 | fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain); | |
1463 | pdkim_hexprint(ctx->debug_stream, headerhash, 20, 1); | |
1464 | } | |
1465 | #endif | |
1466 | } | |
1467 | else { | |
1468 | sha2_update(&(sha2_headers),(unsigned char *)sig_hdr,strlen(sig_hdr)); | |
1469 | sha2_finish(&(sha2_headers),(unsigned char *)headerhash); | |
1470 | #ifdef PDKIM_DEBUG | |
1471 | if (ctx->debug_stream) { | |
1472 | fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain); | |
1473 | pdkim_hexprint(ctx->debug_stream, headerhash, 32, 1); | |
1474 | } | |
1475 | #endif | |
1476 | } | |
1477 | ||
1478 | free(sig_hdr); | |
1479 | ||
1480 | /* SIGNING ---------------------------------------------------------------- */ | |
1481 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1482 | rsa_context rsa; | |
1483 | ||
1484 | rsa_init(&rsa,RSA_PKCS_V15,0,NULL,NULL); | |
1485 | ||
1486 | /* Perform private key operation */ | |
1487 | if (rsa_parse_key(&rsa, (unsigned char *)sig->rsa_privkey, | |
1488 | strlen(sig->rsa_privkey), NULL, 0) != 0) { | |
1489 | return PDKIM_ERR_RSA_PRIVKEY; | |
1490 | } | |
1491 | ||
1492 | sig->sigdata_len = mpi_size(&(rsa.N)); | |
1493 | sig->sigdata = malloc(sig->sigdata_len); | |
1494 | if (sig->sigdata == NULL) return PDKIM_ERR_OOM; | |
1495 | ||
1496 | if (rsa_pkcs1_sign( &rsa, RSA_PRIVATE, | |
1497 | ((sig->algo == PDKIM_ALGO_RSA_SHA1)? | |
67932e54 | 1498 | SIG_RSA_SHA1:SIG_RSA_SHA256), |
80a47a2c TK |
1499 | 0, |
1500 | (unsigned char *)headerhash, | |
1501 | (unsigned char *)sig->sigdata ) != 0) { | |
1502 | return PDKIM_ERR_RSA_SIGNING; | |
1503 | } | |
1504 | ||
1505 | rsa_free(&rsa); | |
1506 | ||
1507 | #ifdef PDKIM_DEBUG | |
1508 | if (ctx->debug_stream) { | |
1509 | fprintf(ctx->debug_stream, "PDKIM [%s] b computed: ", | |
1510 | sig->domain); | |
1511 | pdkim_hexprint(ctx->debug_stream, sig->sigdata, sig->sigdata_len, 1); | |
1512 | } | |
1513 | #endif | |
1514 | ||
1515 | sig->signature_header = pdkim_create_header(ctx->sig,1); | |
1516 | if (sig->signature_header == NULL) return PDKIM_ERR_OOM; | |
1517 | } | |
1518 | /* VERIFICATION ----------------------------------------------------------- */ | |
1519 | else { | |
1520 | rsa_context rsa; | |
1521 | char *dns_txt_name, *dns_txt_reply; | |
1522 | ||
1523 | rsa_init(&rsa,RSA_PKCS_V15,0,NULL,NULL); | |
1524 | ||
1525 | dns_txt_name = malloc(PDKIM_DNS_TXT_MAX_NAMELEN); | |
1526 | if (dns_txt_name == NULL) return PDKIM_ERR_OOM; | |
1527 | dns_txt_reply = malloc(PDKIM_DNS_TXT_MAX_RECLEN); | |
1528 | if (dns_txt_reply == NULL) { | |
1529 | free(dns_txt_name); | |
1530 | return PDKIM_ERR_OOM; | |
1531 | } | |
1532 | memset(dns_txt_reply,0,PDKIM_DNS_TXT_MAX_RECLEN); | |
1533 | memset(dns_txt_name ,0,PDKIM_DNS_TXT_MAX_NAMELEN); | |
1534 | ||
1535 | if (snprintf(dns_txt_name,PDKIM_DNS_TXT_MAX_NAMELEN, | |
1536 | "%s._domainkey.%s.", | |
1537 | sig->selector,sig->domain) >= PDKIM_DNS_TXT_MAX_NAMELEN) { | |
1538 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1539 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_BUFFER_SIZE; | |
1540 | goto NEXT_VERIFY; | |
6ab02e3f | 1541 | } |
80a47a2c TK |
1542 | |
1543 | if ((ctx->dns_txt_callback(dns_txt_name, dns_txt_reply) != PDKIM_OK) || | |
1544 | (dns_txt_reply[0] == '\0')) { | |
1545 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1546 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE; | |
1547 | goto NEXT_VERIFY; | |
1548 | } | |
1549 | ||
1550 | #ifdef PDKIM_DEBUG | |
1551 | if (ctx->debug_stream) { | |
1552 | fprintf(ctx->debug_stream, | |
1553 | "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1554 | fprintf(ctx->debug_stream,"Raw record: "); | |
1555 | pdkim_quoteprint(ctx->debug_stream, dns_txt_reply, strlen(dns_txt_reply), 1); | |
1556 | } | |
1557 | #endif | |
1558 | ||
1559 | sig->pubkey = pdkim_parse_pubkey_record(ctx,dns_txt_reply); | |
1560 | if (sig->pubkey == NULL) { | |
1561 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1562 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING; | |
1563 | #ifdef PDKIM_DEBUG | |
1564 | if (ctx->debug_stream) { | |
1565 | fprintf(ctx->debug_stream,"Error while parsing public key record\n"); | |
1566 | fprintf(ctx->debug_stream, | |
1567 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1568 | } | |
1569 | #endif | |
1570 | goto NEXT_VERIFY; | |
1571 | } | |
1572 | ||
1573 | #ifdef PDKIM_DEBUG | |
1574 | if (ctx->debug_stream) { | |
1575 | fprintf(ctx->debug_stream, | |
1576 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1577 | } | |
1578 | #endif | |
1579 | ||
1580 | if (rsa_parse_public_key(&rsa, | |
1581 | (unsigned char *)sig->pubkey->key, | |
1582 | sig->pubkey->key_len) != 0) { | |
1583 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1584 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING; | |
1585 | goto NEXT_VERIFY; | |
1586 | } | |
1587 | ||
1588 | /* Check the signature */ | |
1589 | if (rsa_pkcs1_verify(&rsa, | |
1590 | RSA_PUBLIC, | |
1591 | ((sig->algo == PDKIM_ALGO_RSA_SHA1)? | |
67932e54 | 1592 | SIG_RSA_SHA1:SIG_RSA_SHA256), |
80a47a2c TK |
1593 | 0, |
1594 | (unsigned char *)headerhash, | |
1595 | (unsigned char *)sig->sigdata) != 0) { | |
1596 | sig->verify_status = PDKIM_VERIFY_FAIL; | |
1597 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE; | |
80a47a2c TK |
1598 | goto NEXT_VERIFY; |
1599 | } | |
1600 | ||
ff7ddfd7 TK |
1601 | /* We have a winner! (if bodydhash was correct earlier) */ |
1602 | if (sig->verify_status == PDKIM_VERIFY_NONE) { | |
1603 | sig->verify_status = PDKIM_VERIFY_PASS; | |
1604 | } | |
1605 | ||
1606 | NEXT_VERIFY: | |
80a47a2c TK |
1607 | |
1608 | #ifdef PDKIM_DEBUG | |
1609 | if (ctx->debug_stream) { | |
ff7ddfd7 TK |
1610 | fprintf(ctx->debug_stream, "PDKIM [%s] signature status: %s", |
1611 | sig->domain, pdkim_verify_status_str(sig->verify_status)); | |
1612 | if (sig->verify_ext_status > 0) { | |
1613 | fprintf(ctx->debug_stream, " (%s)\n", | |
1614 | pdkim_verify_ext_status_str(sig->verify_ext_status)); | |
1615 | } | |
1616 | else { | |
1617 | fprintf(ctx->debug_stream, "\n"); | |
1618 | } | |
80a47a2c TK |
1619 | } |
1620 | #endif | |
1621 | ||
80a47a2c TK |
1622 | rsa_free(&rsa); |
1623 | free(dns_txt_name); | |
1624 | free(dns_txt_reply); | |
1625 | } | |
1626 | ||
1627 | sig = sig->next; | |
1628 | } | |
1629 | ||
1630 | /* If requested, set return pointer to signature(s) */ | |
1631 | if (return_signatures != NULL) { | |
1632 | *return_signatures = ctx->sig; | |
1633 | } | |
1634 | ||
1635 | return PDKIM_OK; | |
1636 | } | |
1637 | ||
1638 | ||
1639 | /* -------------------------------------------------------------------------- */ | |
1640 | DLLEXPORT pdkim_ctx *pdkim_init_verify(int input_mode, | |
1641 | int(*dns_txt_callback)(char *, char *) | |
1642 | ) { | |
1643 | pdkim_ctx *ctx = malloc(sizeof(pdkim_ctx)); | |
1644 | if (ctx == NULL) return NULL; | |
1645 | memset(ctx,0,sizeof(pdkim_ctx)); | |
1646 | ||
1647 | ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN); | |
1648 | if (ctx->linebuf == NULL) { | |
1649 | free(ctx); | |
1650 | return NULL; | |
1651 | } | |
1652 | ||
1653 | ctx->mode = PDKIM_MODE_VERIFY; | |
1654 | ctx->input_mode = input_mode; | |
1655 | ctx->dns_txt_callback = dns_txt_callback; | |
1656 | ||
1657 | return ctx; | |
1658 | } | |
1659 | ||
1660 | ||
1661 | /* -------------------------------------------------------------------------- */ | |
1662 | DLLEXPORT pdkim_ctx *pdkim_init_sign(int input_mode, | |
1663 | char *domain, | |
1664 | char *selector, | |
1665 | char *rsa_privkey) { | |
1666 | pdkim_ctx *ctx; | |
1667 | pdkim_signature *sig; | |
1668 | ||
1669 | if (!domain || !selector || !rsa_privkey) return NULL; | |
1670 | ||
1671 | ctx = malloc(sizeof(pdkim_ctx)); | |
1672 | if (ctx == NULL) return NULL; | |
1673 | memset(ctx,0,sizeof(pdkim_ctx)); | |
1674 | ||
1675 | ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN); | |
1676 | if (ctx->linebuf == NULL) { | |
1677 | free(ctx); | |
1678 | return NULL; | |
1679 | } | |
1680 | ||
1681 | sig = malloc(sizeof(pdkim_signature)); | |
1682 | if (sig == NULL) { | |
1683 | free(ctx->linebuf); | |
1684 | free(ctx); | |
1685 | return NULL; | |
1686 | } | |
1687 | memset(sig,0,sizeof(pdkim_signature)); | |
1688 | sig->bodylength = -1; | |
1689 | ||
1690 | ctx->mode = PDKIM_MODE_SIGN; | |
1691 | ctx->input_mode = input_mode; | |
1692 | ctx->sig = sig; | |
1693 | ||
1694 | ctx->sig->domain = strdup(domain); | |
1695 | ctx->sig->selector = strdup(selector); | |
1696 | ctx->sig->rsa_privkey = strdup(rsa_privkey); | |
1697 | ||
1698 | if (!ctx->sig->domain || !ctx->sig->selector || !ctx->sig->rsa_privkey) { | |
1699 | pdkim_free_ctx(ctx); | |
1700 | return NULL; | |
1701 | } | |
1702 | ||
1703 | ctx->sig->sha1_body = malloc(sizeof(sha1_context)); | |
1704 | if (ctx->sig->sha1_body == NULL) { | |
1705 | pdkim_free_ctx(ctx); | |
1706 | return NULL; | |
1707 | } | |
1708 | sha1_starts(ctx->sig->sha1_body); | |
1709 | ||
1710 | ctx->sig->sha2_body = malloc(sizeof(sha2_context)); | |
1711 | if (ctx->sig->sha2_body == NULL) { | |
1712 | pdkim_free_ctx(ctx); | |
1713 | return NULL; | |
1714 | } | |
1715 | sha2_starts(ctx->sig->sha2_body,0); | |
1716 | ||
1717 | return ctx; | |
6ab02e3f | 1718 | } |
80a47a2c TK |
1719 | |
1720 | #ifdef PDKIM_DEBUG | |
1721 | /* -------------------------------------------------------------------------- */ | |
1722 | DLLEXPORT void pdkim_set_debug_stream(pdkim_ctx *ctx, | |
1723 | FILE *debug_stream) { | |
1724 | ctx->debug_stream = debug_stream; | |
6ab02e3f | 1725 | } |
80a47a2c TK |
1726 | #endif |
1727 | ||
1728 | /* -------------------------------------------------------------------------- */ | |
1729 | DLLEXPORT int pdkim_set_optional(pdkim_ctx *ctx, | |
1730 | char *sign_headers, | |
1731 | char *identity, | |
1732 | int canon_headers, | |
1733 | int canon_body, | |
1734 | long bodylength, | |
1735 | int algo, | |
1736 | unsigned long created, | |
1737 | unsigned long expires) { | |
1738 | ||
1739 | if (identity != NULL) { | |
1740 | ctx->sig->identity = strdup(identity); | |
1741 | if (ctx->sig->identity == NULL) return PDKIM_ERR_OOM; | |
1742 | } | |
1743 | ||
1744 | if (sign_headers != NULL) { | |
1745 | ctx->sig->sign_headers = strdup(sign_headers); | |
1746 | if (ctx->sig->sign_headers == NULL) return PDKIM_ERR_OOM; | |
1747 | } | |
1748 | ||
1749 | ctx->sig->canon_headers = canon_headers; | |
1750 | ctx->sig->canon_body = canon_body; | |
1751 | ctx->sig->bodylength = bodylength; | |
1752 | ctx->sig->algo = algo; | |
1753 | ctx->sig->created = created; | |
1754 | ctx->sig->expires = expires; | |
1755 | ||
1756 | return PDKIM_OK; | |
6ab02e3f | 1757 | } |