Commit | Line | Data |
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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 | ||
ff7ddfd7 | 23 | /* $Cambridge: exim/src/src/pdkim/pdkim.c,v 1.10 2009/11/23 08:34:05 tom 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); | |
214 | return p; | |
6ab02e3f | 215 | } |
80a47a2c TK |
216 | char *pdkim_strncat(pdkim_str *str, char *data, int len) { |
217 | if ((str->allocated - str->len) < (len+1)) { | |
218 | /* Extend the buffer */ | |
219 | int num_frags = ((len+1)/PDKIM_STR_ALLOC_FRAG)+1; | |
220 | char *n = realloc(str->str, | |
221 | (str->allocated+(num_frags*PDKIM_STR_ALLOC_FRAG))); | |
222 | if (n == NULL) return NULL; | |
223 | str->str = n; | |
224 | str->allocated += (num_frags*PDKIM_STR_ALLOC_FRAG); | |
225 | } | |
226 | strncpy(&(str->str[str->len]),data,len); | |
227 | str->len+=len; | |
228 | str->str[str->len] = '\0'; | |
229 | return str->str; | |
6ab02e3f | 230 | } |
80a47a2c TK |
231 | char *pdkim_strcat(pdkim_str *str, char *cstr) { |
232 | return pdkim_strncat(str, cstr, strlen(cstr)); | |
6ab02e3f | 233 | } |
80a47a2c TK |
234 | char *pdkim_numcat(pdkim_str *str, unsigned long num) { |
235 | char minibuf[20]; | |
236 | snprintf(minibuf,20,"%lu",num); | |
237 | return pdkim_strcat(str,minibuf); | |
6ab02e3f | 238 | } |
80a47a2c TK |
239 | char *pdkim_strtrim(pdkim_str *str) { |
240 | char *p = str->str; | |
241 | char *q = str->str; | |
242 | while ( (*p != '\0') && ((*p == '\t') || (*p == ' ')) ) p++; | |
6ab02e3f | 243 | while (*p != '\0') {*q = *p; q++; p++;} |
80a47a2c TK |
244 | *q = '\0'; |
245 | while ( (q != str->str) && ( (*q == '\0') || (*q == '\t') || (*q == ' ') ) ) { | |
246 | *q = '\0'; | |
247 | q--; | |
248 | } | |
249 | str->len = strlen(str->str); | |
250 | return str->str; | |
6ab02e3f | 251 | } |
80a47a2c TK |
252 | char *pdkim_strclear(pdkim_str *str) { |
253 | str->str[0] = '\0'; | |
254 | str->len = 0; | |
255 | return str->str; | |
6ab02e3f | 256 | } |
80a47a2c TK |
257 | void pdkim_strfree(pdkim_str *str) { |
258 | if (str == NULL) return; | |
259 | if (str->str != NULL) free(str->str); | |
260 | free(str); | |
6ab02e3f | 261 | } |
80a47a2c TK |
262 | |
263 | ||
264 | ||
265 | /* -------------------------------------------------------------------------- */ | |
266 | void pdkim_free_pubkey(pdkim_pubkey *pub) { | |
267 | if (pub) { | |
268 | if (pub->version != NULL) free(pub->version); | |
269 | if (pub->granularity != NULL) free(pub->granularity); | |
270 | if (pub->hashes != NULL) free(pub->hashes); | |
271 | if (pub->keytype != NULL) free(pub->keytype); | |
272 | if (pub->srvtype != NULL) free(pub->srvtype); | |
273 | if (pub->notes != NULL) free(pub->notes); | |
274 | if (pub->key != NULL) free(pub->key); | |
275 | free(pub); | |
276 | } | |
277 | } | |
278 | ||
279 | ||
280 | /* -------------------------------------------------------------------------- */ | |
281 | void pdkim_free_sig(pdkim_signature *sig) { | |
282 | if (sig) { | |
283 | pdkim_signature *next = (pdkim_signature *)sig->next; | |
284 | ||
285 | pdkim_stringlist *e = sig->headers; | |
286 | while(e != NULL) { | |
287 | pdkim_stringlist *c = e; | |
288 | if (e->value != NULL) free(e->value); | |
289 | e = e->next; | |
290 | free(c); | |
291 | } | |
292 | ||
293 | if (sig->sigdata != NULL) free(sig->sigdata); | |
294 | if (sig->bodyhash != NULL) free(sig->bodyhash); | |
295 | if (sig->selector != NULL) free(sig->selector); | |
296 | if (sig->domain != NULL) free(sig->domain); | |
297 | if (sig->identity != NULL) free(sig->identity); | |
298 | if (sig->headernames != NULL) free(sig->headernames); | |
299 | if (sig->copiedheaders != NULL) free(sig->copiedheaders); | |
300 | if (sig->rsa_privkey != NULL) free(sig->rsa_privkey); | |
301 | if (sig->sign_headers != NULL) free(sig->sign_headers); | |
302 | if (sig->signature_header != NULL) free(sig->signature_header); | |
303 | if (sig->sha1_body != NULL) free(sig->sha1_body); | |
304 | if (sig->sha2_body != NULL) free(sig->sha2_body); | |
305 | if (sig->hnames_check != NULL) free(sig->hnames_check); | |
306 | ||
307 | if (sig->pubkey != NULL) pdkim_free_pubkey(sig->pubkey); | |
308 | ||
309 | free(sig); | |
310 | if (next != NULL) pdkim_free_sig(next); | |
311 | } | |
6ab02e3f | 312 | } |
80a47a2c TK |
313 | |
314 | ||
315 | /* -------------------------------------------------------------------------- */ | |
316 | DLLEXPORT void pdkim_free_ctx(pdkim_ctx *ctx) { | |
317 | if (ctx) { | |
318 | pdkim_free_sig(ctx->sig); | |
319 | pdkim_strfree(ctx->cur_header); | |
320 | free(ctx); | |
321 | } | |
6ab02e3f | 322 | } |
80a47a2c TK |
323 | |
324 | ||
325 | /* -------------------------------------------------------------------------- */ | |
326 | /* Matches the name of the passed raw "header" against | |
327 | the passed colon-separated "list", starting at entry | |
328 | "start". Returns the position of the header name in | |
329 | the list. */ | |
330 | int header_name_match(char *header, | |
331 | char *tick, | |
332 | int do_tick) { | |
333 | char *hname; | |
334 | char *lcopy; | |
335 | char *p; | |
336 | char *q; | |
337 | int rc = PDKIM_FAIL; | |
338 | ||
339 | /* Get header name */ | |
340 | char *hcolon = strchr(header,':'); | |
341 | if (hcolon == NULL) return rc; /* This isn't a header */ | |
342 | hname = malloc((hcolon-header)+1); | |
343 | if (hname == NULL) return PDKIM_ERR_OOM; | |
344 | memset(hname,0,(hcolon-header)+1); | |
345 | strncpy(hname,header,(hcolon-header)); | |
346 | ||
347 | /* Copy tick-off list locally, so we can punch zeroes into it */ | |
348 | lcopy = strdup(tick); | |
349 | if (lcopy == NULL) { | |
350 | free(hname); | |
351 | return PDKIM_ERR_OOM; | |
352 | } | |
353 | p = lcopy; | |
354 | q = strchr(p,':'); | |
355 | while (q != NULL) { | |
356 | *q = '\0'; | |
357 | ||
358 | if (strcasecmp(p,hname) == 0) { | |
359 | rc = PDKIM_OK; | |
360 | /* Invalidate header name instance in tick-off list */ | |
361 | if (do_tick) tick[p-lcopy] = '_'; | |
362 | goto BAIL; | |
363 | } | |
364 | ||
365 | p = q+1; | |
366 | q = strchr(p,':'); | |
367 | } | |
368 | ||
369 | if (strcasecmp(p,hname) == 0) { | |
370 | rc = PDKIM_OK; | |
371 | /* Invalidate header name instance in tick-off list */ | |
372 | if (do_tick) tick[p-lcopy] = '_'; | |
373 | } | |
374 | ||
375 | BAIL: | |
376 | free(hname); | |
377 | free(lcopy); | |
378 | return rc; | |
379 | } | |
380 | ||
381 | ||
382 | /* -------------------------------------------------------------------------- */ | |
383 | /* Performs "relaxed" canonicalization of a header. The returned pointer needs | |
384 | to be free()d. */ | |
385 | char *pdkim_relax_header (char *header, int crlf) { | |
386 | int past_field_name = 0; | |
387 | int seen_wsp = 0; | |
388 | char *p = header; | |
389 | char *q; | |
a7921bbe | 390 | char *relaxed = malloc(strlen(header)+3); |
80a47a2c TK |
391 | if (relaxed == NULL) return NULL; |
392 | q = relaxed; | |
393 | while (*p != '\0') { | |
394 | int c = *p; | |
395 | /* Ignore CR & LF */ | |
396 | if ( (c == '\r') || (c == '\n') ) { | |
397 | p++; | |
398 | continue; | |
399 | } | |
400 | if ( (c == '\t') || (c == ' ') ) { | |
401 | c = ' '; /* Turns WSP into SP */ | |
402 | if (seen_wsp) { | |
403 | p++; | |
404 | continue; | |
405 | } | |
406 | else seen_wsp = 1; | |
407 | } | |
408 | else { | |
409 | if ( (!past_field_name) && (c == ':') ) { | |
410 | if (seen_wsp) q--; /* This removes WSP before the colon */ | |
411 | seen_wsp = 1; /* This removes WSP after the colon */ | |
412 | past_field_name = 1; | |
413 | } | |
414 | else seen_wsp = 0; | |
415 | } | |
416 | /* Lowercase header name */ | |
417 | if (!past_field_name) c = tolower(c); | |
418 | *q = c; | |
419 | p++; | |
420 | q++; | |
421 | } | |
422 | *q = '\0'; | |
423 | if (crlf) strcat(relaxed,"\r\n"); | |
424 | return relaxed; | |
6ab02e3f | 425 | } |
80a47a2c TK |
426 | |
427 | ||
428 | /* -------------------------------------------------------------------------- */ | |
429 | #define PDKIM_QP_ERROR_DECODE -1 | |
430 | char *pdkim_decode_qp_char(char *qp_p, int *c) { | |
431 | char *initial_pos = qp_p; | |
432 | ||
433 | /* Advance one char */ | |
434 | qp_p++; | |
435 | ||
436 | /* Check for two hex digits and decode them */ | |
437 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) { | |
438 | /* Do hex conversion */ | |
439 | if (isdigit(*qp_p)) {*c = *qp_p - '0';} | |
6ab02e3f | 440 | else {*c = toupper(*qp_p) - 'A' + 10;} |
80a47a2c TK |
441 | *c <<= 4; |
442 | if (isdigit(qp_p[1])) {*c |= qp_p[1] - '0';} | |
6ab02e3f | 443 | else {*c |= toupper(qp_p[1]) - 'A' + 10;} |
80a47a2c | 444 | return qp_p + 2; |
6ab02e3f | 445 | } |
80a47a2c TK |
446 | |
447 | /* Illegal char here */ | |
448 | *c = PDKIM_QP_ERROR_DECODE; | |
449 | return initial_pos; | |
450 | } | |
451 | ||
452 | ||
453 | /* -------------------------------------------------------------------------- */ | |
454 | char *pdkim_decode_qp(char *str) { | |
455 | int nchar = 0; | |
456 | char *q; | |
457 | char *p = str; | |
458 | char *n = malloc(strlen(p)+1); | |
459 | if (n == NULL) return NULL; | |
460 | *n = '\0'; | |
461 | q = n; | |
462 | while (*p != '\0') { | |
463 | if (*p == '=') { | |
464 | p = pdkim_decode_qp_char(p,&nchar); | |
465 | if (nchar >= 0) { | |
466 | *q = nchar; | |
467 | q++; | |
468 | continue; | |
469 | } | |
470 | } | |
471 | else { | |
472 | *q = *p; | |
473 | q++; | |
474 | } | |
475 | p++; | |
476 | } | |
477 | *q = '\0'; | |
478 | return n; | |
479 | } | |
480 | ||
481 | ||
482 | /* -------------------------------------------------------------------------- */ | |
483 | char *pdkim_decode_base64(char *str, int *num_decoded) { | |
484 | int dlen = 0; | |
485 | char *res; | |
486 | ||
487 | base64_decode(NULL, &dlen, (unsigned char *)str, strlen(str)); | |
488 | res = malloc(dlen+1); | |
489 | if (res == NULL) return NULL; | |
490 | if (base64_decode((unsigned char *)res,&dlen,(unsigned char *)str,strlen(str)) != 0) { | |
491 | free(res); | |
492 | return NULL; | |
493 | } | |
494 | if (num_decoded != NULL) *num_decoded = dlen; | |
495 | return res; | |
496 | } | |
497 | ||
498 | /* -------------------------------------------------------------------------- */ | |
499 | char *pdkim_encode_base64(char *str, int num) { | |
500 | int dlen = 0; | |
501 | char *res; | |
502 | ||
503 | base64_encode(NULL, &dlen, (unsigned char *)str, num); | |
504 | res = malloc(dlen+1); | |
505 | if (res == NULL) return NULL; | |
506 | if (base64_encode((unsigned char *)res,&dlen,(unsigned char *)str,num) != 0) { | |
507 | free(res); | |
508 | return NULL; | |
509 | } | |
510 | return res; | |
511 | } | |
512 | ||
513 | ||
514 | /* -------------------------------------------------------------------------- */ | |
515 | #define PDKIM_HDR_LIMBO 0 | |
516 | #define PDKIM_HDR_TAG 1 | |
517 | #define PDKIM_HDR_VALUE 2 | |
518 | pdkim_signature *pdkim_parse_sig_header(pdkim_ctx *ctx, char *raw_hdr) { | |
519 | pdkim_signature *sig ; | |
520 | char *p,*q; | |
521 | pdkim_str *cur_tag = NULL; | |
522 | pdkim_str *cur_val = NULL; | |
523 | int past_hname = 0; | |
524 | int in_b_val = 0; | |
525 | int where = PDKIM_HDR_LIMBO; | |
526 | int i; | |
527 | ||
528 | sig = malloc(sizeof(pdkim_signature)); | |
529 | if (sig == NULL) return NULL; | |
530 | memset(sig,0,sizeof(pdkim_signature)); | |
531 | sig->bodylength = -1; | |
532 | ||
533 | sig->rawsig_no_b_val = malloc(strlen(raw_hdr)+1); | |
534 | if (sig->rawsig_no_b_val == NULL) { | |
535 | free(sig); | |
536 | return NULL; | |
537 | } | |
538 | ||
539 | p = raw_hdr; | |
540 | q = sig->rawsig_no_b_val; | |
541 | ||
542 | while (1) { | |
543 | ||
544 | /* Ignore FWS */ | |
545 | if ( (*p == '\r') || (*p == '\n') ) | |
546 | goto NEXT_CHAR; | |
547 | ||
548 | /* Fast-forward through header name */ | |
549 | if (!past_hname) { | |
550 | if (*p == ':') past_hname = 1; | |
551 | goto NEXT_CHAR; | |
552 | } | |
553 | ||
554 | if (where == PDKIM_HDR_LIMBO) { | |
555 | /* In limbo, just wait for a tag-char to appear */ | |
556 | if (!((*p >= 'a') && (*p <= 'z'))) | |
557 | goto NEXT_CHAR; | |
558 | ||
559 | where = PDKIM_HDR_TAG; | |
560 | } | |
561 | ||
562 | if (where == PDKIM_HDR_TAG) { | |
563 | if (cur_tag == NULL) | |
564 | cur_tag = pdkim_strnew(NULL); | |
565 | ||
566 | if ((*p >= 'a') && (*p <= 'z')) | |
567 | pdkim_strncat(cur_tag,p,1); | |
568 | ||
569 | if (*p == '=') { | |
570 | if (strcmp(cur_tag->str,"b") == 0) { | |
571 | *q = '='; q++; | |
572 | in_b_val = 1; | |
573 | } | |
574 | where = PDKIM_HDR_VALUE; | |
575 | goto NEXT_CHAR; | |
576 | } | |
577 | } | |
578 | ||
579 | if (where == PDKIM_HDR_VALUE) { | |
580 | if (cur_val == NULL) | |
581 | cur_val = pdkim_strnew(NULL); | |
582 | ||
583 | if ( (*p == '\r') || (*p == '\n') || (*p == ' ') || (*p == '\t') ) | |
584 | goto NEXT_CHAR; | |
585 | ||
586 | if ( (*p == ';') || (*p == '\0') ) { | |
587 | if (cur_tag->len > 0) { | |
588 | pdkim_strtrim(cur_val); | |
589 | #ifdef PDKIM_DEBUG | |
590 | if (ctx->debug_stream) | |
591 | fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str); | |
592 | #endif | |
593 | switch (cur_tag->str[0]) { | |
594 | case 'b': | |
595 | switch (cur_tag->str[1]) { | |
596 | case 'h': | |
597 | sig->bodyhash = pdkim_decode_base64(cur_val->str,&(sig->bodyhash_len)); | |
598 | break; | |
599 | default: | |
600 | sig->sigdata = pdkim_decode_base64(cur_val->str,&(sig->sigdata_len)); | |
601 | break; | |
602 | } | |
603 | break; | |
604 | case 'v': | |
605 | if (strcmp(cur_val->str,PDKIM_SIGNATURE_VERSION) == 0) { | |
606 | /* We only support version 1, and that is currently the | |
607 | only version there is. */ | |
608 | sig->version = 1; | |
609 | } | |
610 | break; | |
611 | case 'a': | |
612 | i = 0; | |
613 | while (pdkim_algos[i] != NULL) { | |
614 | if (strcmp(cur_val->str,pdkim_algos[i]) == 0 ) { | |
615 | sig->algo = i; | |
616 | break; | |
617 | } | |
618 | i++; | |
619 | } | |
620 | break; | |
621 | case 'c': | |
622 | i = 0; | |
623 | while (pdkim_combined_canons[i].str != NULL) { | |
624 | if (strcmp(cur_val->str,pdkim_combined_canons[i].str) == 0 ) { | |
625 | sig->canon_headers = pdkim_combined_canons[i].canon_headers; | |
626 | sig->canon_body = pdkim_combined_canons[i].canon_body; | |
627 | break; | |
628 | } | |
629 | i++; | |
630 | } | |
631 | break; | |
632 | case 'q': | |
633 | i = 0; | |
634 | while (pdkim_querymethods[i] != NULL) { | |
635 | if (strcmp(cur_val->str,pdkim_querymethods[i]) == 0 ) { | |
636 | sig->querymethod = i; | |
637 | break; | |
638 | } | |
639 | i++; | |
640 | } | |
641 | break; | |
642 | case 's': | |
643 | sig->selector = strdup(cur_val->str); | |
644 | break; | |
645 | case 'd': | |
646 | sig->domain = strdup(cur_val->str); | |
647 | break; | |
648 | case 'i': | |
649 | sig->identity = pdkim_decode_qp(cur_val->str); | |
650 | break; | |
651 | case 't': | |
652 | sig->created = strtoul(cur_val->str,NULL,10); | |
653 | break; | |
654 | case 'x': | |
655 | sig->expires = strtoul(cur_val->str,NULL,10); | |
656 | break; | |
657 | case 'l': | |
658 | sig->bodylength = strtol(cur_val->str,NULL,10); | |
659 | break; | |
660 | case 'h': | |
661 | sig->headernames = strdup(cur_val->str); | |
662 | break; | |
663 | case 'z': | |
664 | sig->copiedheaders = pdkim_decode_qp(cur_val->str); | |
665 | break; | |
666 | default: | |
667 | #ifdef PDKIM_DEBUG | |
668 | if (ctx->debug_stream) | |
669 | fprintf(ctx->debug_stream, "Unknown tag encountered\n"); | |
670 | #endif | |
671 | break; | |
672 | } | |
673 | } | |
674 | pdkim_strclear(cur_tag); | |
675 | pdkim_strclear(cur_val); | |
676 | in_b_val = 0; | |
677 | where = PDKIM_HDR_LIMBO; | |
678 | goto NEXT_CHAR; | |
679 | } | |
680 | else pdkim_strncat(cur_val,p,1); | |
681 | } | |
682 | ||
683 | NEXT_CHAR: | |
684 | if (*p == '\0') break; | |
685 | ||
686 | if (!in_b_val) { | |
687 | *q = *p; | |
688 | q++; | |
689 | } | |
690 | p++; | |
691 | } | |
692 | ||
693 | /* Make sure the most important bits are there. */ | |
694 | if (!(sig->domain && (*(sig->domain) != '\0') && | |
695 | sig->selector && (*(sig->selector) != '\0') && | |
696 | sig->headernames && (*(sig->headernames) != '\0') && | |
697 | sig->bodyhash && | |
698 | sig->sigdata && | |
699 | sig->version)) { | |
700 | pdkim_free_sig(sig); | |
701 | return NULL; | |
702 | } | |
703 | ||
704 | /* Copy header list to 'tick-off' header list */ | |
705 | sig->hnames_check = strdup(sig->headernames); | |
706 | ||
707 | *q = '\0'; | |
708 | /* Chomp raw header. The final newline must not be added to the signature. */ | |
709 | q--; | |
710 | while( (q > sig->rawsig_no_b_val) && ((*q == '\r') || (*q == '\n')) ) { | |
711 | *q = '\0'; q--; | |
712 | } | |
713 | ||
714 | #ifdef PDKIM_DEBUG | |
715 | if (ctx->debug_stream) { | |
716 | fprintf(ctx->debug_stream, | |
717 | "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
718 | pdkim_quoteprint(ctx->debug_stream, | |
719 | sig->rawsig_no_b_val, | |
720 | strlen(sig->rawsig_no_b_val), 1); | |
721 | fprintf(ctx->debug_stream, | |
722 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
723 | } | |
724 | #endif | |
725 | ||
726 | sig->sha1_body = malloc(sizeof(sha1_context)); | |
727 | if (sig->sha1_body == NULL) { | |
728 | pdkim_free_sig(sig); | |
729 | return NULL; | |
730 | } | |
731 | sig->sha2_body = malloc(sizeof(sha2_context)); | |
732 | if (sig->sha2_body == NULL) { | |
733 | pdkim_free_sig(sig); | |
734 | return NULL; | |
735 | } | |
736 | ||
737 | sha1_starts(sig->sha1_body); | |
738 | sha2_starts(sig->sha2_body,0); | |
739 | ||
740 | return sig; | |
741 | } | |
742 | ||
743 | ||
744 | /* -------------------------------------------------------------------------- */ | |
745 | pdkim_pubkey *pdkim_parse_pubkey_record(pdkim_ctx *ctx, char *raw_record) { | |
746 | pdkim_pubkey *pub ; | |
747 | char *p; | |
748 | pdkim_str *cur_tag = NULL; | |
749 | pdkim_str *cur_val = NULL; | |
750 | int where = PDKIM_HDR_LIMBO; | |
751 | ||
752 | pub = malloc(sizeof(pdkim_pubkey)); | |
753 | if (pub == NULL) return NULL; | |
754 | memset(pub,0,sizeof(pdkim_pubkey)); | |
755 | ||
756 | p = raw_record; | |
757 | ||
758 | while (1) { | |
759 | ||
760 | /* Ignore FWS */ | |
761 | if ( (*p == '\r') || (*p == '\n') ) | |
762 | goto NEXT_CHAR; | |
763 | ||
764 | if (where == PDKIM_HDR_LIMBO) { | |
765 | /* In limbo, just wait for a tag-char to appear */ | |
766 | if (!((*p >= 'a') && (*p <= 'z'))) | |
767 | goto NEXT_CHAR; | |
768 | ||
769 | where = PDKIM_HDR_TAG; | |
770 | } | |
771 | ||
772 | if (where == PDKIM_HDR_TAG) { | |
773 | if (cur_tag == NULL) | |
774 | cur_tag = pdkim_strnew(NULL); | |
775 | ||
776 | if ((*p >= 'a') && (*p <= 'z')) | |
777 | pdkim_strncat(cur_tag,p,1); | |
778 | ||
779 | if (*p == '=') { | |
780 | where = PDKIM_HDR_VALUE; | |
781 | goto NEXT_CHAR; | |
782 | } | |
783 | } | |
784 | ||
785 | if (where == PDKIM_HDR_VALUE) { | |
786 | if (cur_val == NULL) | |
787 | cur_val = pdkim_strnew(NULL); | |
788 | ||
789 | if ( (*p == '\r') || (*p == '\n') ) | |
790 | goto NEXT_CHAR; | |
791 | ||
792 | if ( (*p == ';') || (*p == '\0') ) { | |
793 | if (cur_tag->len > 0) { | |
794 | pdkim_strtrim(cur_val); | |
795 | #ifdef PDKIM_DEBUG | |
796 | if (ctx->debug_stream) | |
797 | fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str); | |
798 | #endif | |
799 | switch (cur_tag->str[0]) { | |
800 | case 'v': | |
801 | /* This tag isn't evaluated because: | |
802 | - We only support version DKIM1. | |
803 | - Which is the default for this value (set below) | |
804 | - Other versions are currently not specified. */ | |
805 | break; | |
806 | case 'h': | |
807 | pub->hashes = strdup(cur_val->str); | |
808 | break; | |
809 | case 'g': | |
810 | pub->granularity = strdup(cur_val->str); | |
811 | break; | |
812 | case 'n': | |
813 | pub->notes = pdkim_decode_qp(cur_val->str); | |
814 | break; | |
815 | case 'p': | |
816 | pub->key = pdkim_decode_base64(cur_val->str,&(pub->key_len)); | |
817 | break; | |
818 | case 'k': | |
819 | pub->hashes = strdup(cur_val->str); | |
820 | break; | |
821 | case 's': | |
822 | pub->srvtype = strdup(cur_val->str); | |
823 | break; | |
824 | case 't': | |
825 | if (strchr(cur_val->str,'t') != NULL) pub->testing = 1; | |
826 | if (strchr(cur_val->str,'s') != NULL) pub->no_subdomaining = 1; | |
827 | break; | |
828 | default: | |
829 | #ifdef PDKIM_DEBUG | |
830 | if (ctx->debug_stream) | |
831 | fprintf(ctx->debug_stream, "Unknown tag encountered\n"); | |
832 | #endif | |
833 | break; | |
834 | } | |
835 | } | |
836 | pdkim_strclear(cur_tag); | |
837 | pdkim_strclear(cur_val); | |
838 | where = PDKIM_HDR_LIMBO; | |
839 | goto NEXT_CHAR; | |
840 | } | |
841 | else pdkim_strncat(cur_val,p,1); | |
842 | } | |
843 | ||
844 | NEXT_CHAR: | |
845 | if (*p == '\0') break; | |
846 | p++; | |
847 | } | |
848 | ||
849 | /* Set fallback defaults */ | |
850 | if (pub->version == NULL) pub->version = strdup(PDKIM_PUB_RECORD_VERSION); | |
851 | if (pub->granularity == NULL) pub->granularity = strdup("*"); | |
852 | if (pub->keytype == NULL) pub->keytype = strdup("rsa"); | |
853 | if (pub->srvtype == NULL) pub->srvtype = strdup("*"); | |
854 | ||
855 | /* p= is required */ | |
856 | if (pub->key == NULL) { | |
857 | pdkim_free_pubkey(pub); | |
858 | return NULL; | |
859 | } | |
860 | ||
861 | return pub; | |
862 | } | |
863 | ||
864 | ||
865 | /* -------------------------------------------------------------------------- */ | |
866 | int pdkim_update_bodyhash(pdkim_ctx *ctx, char *data, int len) { | |
867 | pdkim_signature *sig = ctx->sig; | |
868 | /* Cache relaxed version of data */ | |
869 | char *relaxed_data = NULL; | |
870 | int relaxed_len = 0; | |
871 | ||
872 | /* Traverse all signatures, updating their hashes. */ | |
873 | while (sig != NULL) { | |
874 | /* Defaults to simple canon (no further treatment necessary) */ | |
875 | char *canon_data = data; | |
876 | int canon_len = len; | |
877 | ||
878 | if (sig->canon_body == PDKIM_CANON_RELAXED) { | |
879 | /* Relax the line if not done already */ | |
880 | if (relaxed_data == NULL) { | |
881 | int seen_wsp = 0; | |
882 | char *p = data; | |
883 | int q = 0; | |
884 | relaxed_data = malloc(len+1); | |
885 | if (relaxed_data == NULL) return PDKIM_ERR_OOM; | |
886 | while (*p != '\0') { | |
887 | char c = *p; | |
c2b89b98 TK |
888 | if (c == '\r') { |
889 | if ( (q > 0) && (relaxed_data[q-1] == ' ') ) q--; | |
890 | } | |
891 | else if ( (c == '\t') || (c == ' ') ) { | |
80a47a2c TK |
892 | c = ' '; /* Turns WSP into SP */ |
893 | if (seen_wsp) { | |
894 | p++; | |
895 | continue; | |
896 | } | |
897 | else seen_wsp = 1; | |
898 | } | |
899 | else seen_wsp = 0; | |
900 | relaxed_data[q++] = c; | |
901 | p++; | |
902 | } | |
903 | relaxed_data[q] = '\0'; | |
904 | relaxed_len = q; | |
905 | } | |
906 | canon_data = relaxed_data; | |
907 | canon_len = relaxed_len; | |
908 | } | |
909 | ||
910 | /* Make sure we don't exceed the to-be-signed body length */ | |
911 | if ((sig->bodylength >= 0) && | |
912 | ((sig->signed_body_bytes+(unsigned long)canon_len) > sig->bodylength)) | |
913 | canon_len = (sig->bodylength - sig->signed_body_bytes); | |
914 | ||
915 | if (canon_len > 0) { | |
916 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
917 | sha1_update(sig->sha1_body,(unsigned char *)canon_data,canon_len); | |
918 | else | |
919 | sha2_update(sig->sha2_body,(unsigned char *)canon_data,canon_len); | |
920 | sig->signed_body_bytes += canon_len; | |
921 | #ifdef PDKIM_DEBUG | |
922 | if (ctx->debug_stream!=NULL) | |
923 | pdkim_quoteprint(ctx->debug_stream,canon_data,canon_len,0); | |
924 | #endif | |
925 | } | |
926 | ||
927 | sig = sig->next; | |
928 | } | |
929 | ||
930 | if (relaxed_data != NULL) free(relaxed_data); | |
931 | return PDKIM_OK; | |
6ab02e3f | 932 | } |
80a47a2c TK |
933 | |
934 | ||
935 | /* -------------------------------------------------------------------------- */ | |
936 | int pdkim_finish_bodyhash(pdkim_ctx *ctx) { | |
937 | pdkim_signature *sig = ctx->sig; | |
938 | ||
939 | /* Traverse all signatures */ | |
940 | while (sig != NULL) { | |
941 | ||
942 | /* Finish hashes */ | |
943 | unsigned char bh[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */ | |
944 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
945 | sha1_finish(sig->sha1_body,bh); | |
946 | else | |
947 | sha2_finish(sig->sha2_body,bh); | |
948 | ||
949 | #ifdef PDKIM_DEBUG | |
950 | if (ctx->debug_stream) { | |
951 | fprintf(ctx->debug_stream, "PDKIM [%s] Body bytes hashed: %lu\n", | |
952 | sig->domain, sig->signed_body_bytes); | |
953 | fprintf(ctx->debug_stream, "PDKIM [%s] bh computed: ", sig->domain); | |
954 | pdkim_hexprint(ctx->debug_stream, (char *)bh, | |
955 | (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1); | |
956 | } | |
957 | #endif | |
958 | ||
959 | /* SIGNING -------------------------------------------------------------- */ | |
960 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
961 | sig->bodyhash_len = (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32; | |
962 | sig->bodyhash = malloc(sig->bodyhash_len); | |
963 | if (sig->bodyhash == NULL) return PDKIM_ERR_OOM; | |
964 | memcpy(sig->bodyhash,bh,sig->bodyhash_len); | |
965 | ||
966 | /* If bodylength limit is set, and we have received less bytes | |
967 | than the requested amount, effectively remove the limit tag. */ | |
968 | if (sig->signed_body_bytes < sig->bodylength) sig->bodylength = -1; | |
969 | } | |
970 | /* VERIFICATION --------------------------------------------------------- */ | |
971 | else { | |
972 | /* Compare bodyhash */ | |
973 | if (memcmp(bh,sig->bodyhash, | |
974 | (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32) == 0) { | |
975 | #ifdef PDKIM_DEBUG | |
976 | if (ctx->debug_stream) | |
977 | fprintf(ctx->debug_stream, "PDKIM [%s] Body hash verified OK\n", | |
978 | sig->domain); | |
979 | #endif | |
980 | } | |
981 | else { | |
982 | #ifdef PDKIM_DEBUG | |
983 | if (ctx->debug_stream) { | |
984 | fprintf(ctx->debug_stream, "PDKIM [%s] Body hash did NOT verify\n", | |
985 | sig->domain); | |
986 | fprintf(ctx->debug_stream, "PDKIM [%s] bh signature: ", sig->domain); | |
987 | pdkim_hexprint(ctx->debug_stream, sig->bodyhash, | |
988 | (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1); | |
989 | } | |
990 | #endif | |
991 | sig->verify_status = PDKIM_VERIFY_FAIL; | |
992 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY; | |
993 | } | |
994 | } | |
995 | ||
996 | sig = sig->next; | |
997 | } | |
998 | ||
999 | return PDKIM_OK; | |
6ab02e3f | 1000 | } |
80a47a2c TK |
1001 | |
1002 | ||
1003 | ||
1004 | /* -------------------------------------------------------------------------- */ | |
1005 | /* Callback from pdkim_feed below for processing complete body lines */ | |
1006 | int pdkim_bodyline_complete(pdkim_ctx *ctx) { | |
1007 | char *p = ctx->linebuf; | |
1008 | int n = ctx->linebuf_offset; | |
1009 | ||
1010 | /* Ignore extra data if we've seen the end-of-data marker */ | |
1011 | if (ctx->seen_eod) goto BAIL; | |
1012 | ||
1013 | /* We've always got one extra byte to stuff a zero ... */ | |
1014 | ctx->linebuf[(ctx->linebuf_offset)] = '\0'; | |
1015 | ||
1016 | if (ctx->input_mode == PDKIM_INPUT_SMTP) { | |
1017 | /* Terminate on EOD marker */ | |
1018 | if (memcmp(p,".\r\n",3) == 0) { | |
1019 | ctx->seen_eod = 1; | |
1020 | goto BAIL; | |
1021 | } | |
1022 | /* Unstuff dots */ | |
1023 | if (memcmp(p,"..",2) == 0) { | |
1024 | p++; | |
1025 | n--; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | /* Empty lines need to be buffered until we find a non-empty line */ | |
1030 | if (memcmp(p,"\r\n",2) == 0) { | |
1031 | ctx->num_buffered_crlf++; | |
1032 | goto BAIL; | |
1033 | } | |
1034 | ||
1035 | /* At this point, we have a non-empty line, so release the buffered ones. */ | |
1036 | while (ctx->num_buffered_crlf) { | |
1037 | pdkim_update_bodyhash(ctx,"\r\n",2); | |
1038 | ctx->num_buffered_crlf--; | |
1039 | } | |
1040 | ||
1041 | pdkim_update_bodyhash(ctx,p,n); | |
1042 | ||
1043 | BAIL: | |
1044 | ctx->linebuf_offset = 0; | |
1045 | return PDKIM_OK; | |
1046 | } | |
1047 | ||
1048 | ||
1049 | /* -------------------------------------------------------------------------- */ | |
1050 | /* Callback from pdkim_feed below for processing complete headers */ | |
1051 | #define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:" | |
1052 | int pdkim_header_complete(pdkim_ctx *ctx) { | |
1053 | pdkim_signature *sig = ctx->sig; | |
1054 | ||
1055 | /* Special case: The last header can have an extra \r appended */ | |
1056 | if ( (ctx->cur_header->len > 1) && | |
1057 | (ctx->cur_header->str[(ctx->cur_header->len)-1] == '\r') ) { | |
1058 | ctx->cur_header->str[(ctx->cur_header->len)-1] = '\0'; | |
1059 | ctx->cur_header->len--; | |
1060 | } | |
1061 | ||
1062 | ctx->num_headers++; | |
1063 | if (ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL; | |
1064 | ||
1065 | /* Traverse all signatures */ | |
1066 | while (sig != NULL) { | |
1067 | pdkim_stringlist *list; | |
1068 | ||
1069 | /* SIGNING -------------------------------------------------------------- */ | |
1070 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1071 | if (header_name_match(ctx->cur_header->str, | |
1072 | sig->sign_headers? | |
1073 | sig->sign_headers: | |
1074 | PDKIM_DEFAULT_SIGN_HEADERS, 0) != PDKIM_OK) goto NEXT_SIG; | |
1075 | } | |
1076 | /* VERIFICATION --------------------------------------------------------- */ | |
1077 | else { | |
1078 | /* Header is not included or all instances were already 'ticked off' */ | |
1079 | if (header_name_match(ctx->cur_header->str, | |
1080 | sig->hnames_check, 1) != PDKIM_OK) goto NEXT_SIG; | |
1081 | } | |
1082 | ||
97713345 TK |
1083 | /* Add header to the signed headers list (in reverse order) */ |
1084 | list = pdkim_prepend_stringlist(sig->headers, | |
1085 | ctx->cur_header->str); | |
80a47a2c TK |
1086 | if (list == NULL) return PDKIM_ERR_OOM; |
1087 | sig->headers = list; | |
1088 | ||
1089 | NEXT_SIG: | |
1090 | sig = sig->next; | |
1091 | } | |
1092 | ||
1093 | /* DKIM-Signature: headers are added to the verification list */ | |
1094 | if ( (ctx->mode == PDKIM_MODE_VERIFY) && | |
1095 | (strncasecmp(ctx->cur_header->str, | |
1096 | DKIM_SIGNATURE_HEADERNAME, | |
1097 | strlen(DKIM_SIGNATURE_HEADERNAME)) == 0) ) { | |
1098 | pdkim_signature *new_sig; | |
1099 | /* Create and chain new signature block */ | |
1100 | #ifdef PDKIM_DEBUG | |
1101 | if (ctx->debug_stream) | |
1102 | fprintf(ctx->debug_stream, | |
1103 | "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1104 | #endif | |
1105 | new_sig = pdkim_parse_sig_header(ctx, ctx->cur_header->str); | |
1106 | if (new_sig != NULL) { | |
1107 | pdkim_signature *last_sig = ctx->sig; | |
1108 | if (last_sig == NULL) { | |
1109 | ctx->sig = new_sig; | |
1110 | } | |
1111 | else { | |
6ab02e3f | 1112 | while (last_sig->next != NULL) { last_sig = last_sig->next; } |
80a47a2c TK |
1113 | last_sig->next = new_sig; |
1114 | } | |
1115 | } | |
1116 | else { | |
1117 | #ifdef PDKIM_DEBUG | |
1118 | if (ctx->debug_stream) { | |
1119 | fprintf(ctx->debug_stream,"Error while parsing signature header\n"); | |
1120 | fprintf(ctx->debug_stream, | |
1121 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1122 | } | |
1123 | #endif | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | BAIL: | |
1128 | pdkim_strclear(ctx->cur_header); /* Re-use existing pdkim_str */ | |
1129 | return PDKIM_OK; | |
6ab02e3f | 1130 | } |
80a47a2c TK |
1131 | |
1132 | ||
1133 | ||
1134 | /* -------------------------------------------------------------------------- */ | |
1135 | #define HEADER_BUFFER_FRAG_SIZE 256 | |
1136 | DLLEXPORT int pdkim_feed (pdkim_ctx *ctx, | |
1137 | char *data, | |
1138 | int len) { | |
1139 | int p; | |
1140 | for (p=0;p<len;p++) { | |
1141 | char c = data[p]; | |
1142 | if (ctx->past_headers) { | |
1143 | /* Processing body byte */ | |
1144 | ctx->linebuf[(ctx->linebuf_offset)++] = c; | |
1145 | if (c == '\n') { | |
1146 | int rc = pdkim_bodyline_complete(ctx); /* End of line */ | |
1147 | if (rc != PDKIM_OK) return rc; | |
1148 | } | |
1149 | if (ctx->linebuf_offset == (PDKIM_MAX_BODY_LINE_LEN-1)) | |
1150 | return PDKIM_ERR_LONG_LINE; | |
1151 | } | |
1152 | else { | |
1153 | /* Processing header byte */ | |
1154 | if (c != '\r') { | |
1155 | if (c == '\n') { | |
1156 | if (ctx->seen_lf) { | |
1157 | int rc = pdkim_header_complete(ctx); /* Seen last header line */ | |
1158 | if (rc != PDKIM_OK) return rc; | |
1159 | ctx->past_headers = 1; | |
1160 | ctx->seen_lf = 0; | |
1161 | #ifdef PDKIM_DEBUG | |
1162 | if (ctx->debug_stream) | |
1163 | fprintf(ctx->debug_stream, | |
1164 | "PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1165 | #endif | |
1166 | continue; | |
1167 | } | |
1168 | else ctx->seen_lf = 1; | |
1169 | } | |
1170 | else if (ctx->seen_lf) { | |
1171 | if (! ((c == '\t') || (c == ' '))) { | |
1172 | int rc = pdkim_header_complete(ctx); /* End of header */ | |
1173 | if (rc != PDKIM_OK) return rc; | |
1174 | } | |
1175 | ctx->seen_lf = 0; | |
1176 | } | |
1177 | } | |
1178 | if (ctx->cur_header == NULL) { | |
1179 | ctx->cur_header = pdkim_strnew(NULL); | |
1180 | if (ctx->cur_header == NULL) return PDKIM_ERR_OOM; | |
1181 | } | |
1182 | if (ctx->cur_header->len < PDKIM_MAX_HEADER_LEN) | |
1183 | if (pdkim_strncat(ctx->cur_header,&data[p],1) == NULL) | |
1184 | return PDKIM_ERR_OOM; | |
1185 | } | |
1186 | } | |
1187 | return PDKIM_OK; | |
6ab02e3f | 1188 | } |
80a47a2c TK |
1189 | |
1190 | ||
1191 | /* -------------------------------------------------------------------------- */ | |
1192 | char *pdkim_create_header(pdkim_signature *sig, int final) { | |
1193 | char *rc = NULL; | |
1194 | char *base64_bh = NULL; | |
1195 | char *base64_b = NULL; | |
1196 | pdkim_str *hdr = pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION); | |
1197 | if (hdr == NULL) return NULL; | |
1198 | ||
1199 | base64_bh = pdkim_encode_base64(sig->bodyhash, sig->bodyhash_len); | |
1200 | if (base64_bh == NULL) goto BAIL; | |
1201 | ||
1202 | /* Required and static bits */ | |
1203 | if ( | |
1204 | pdkim_strcat(hdr,"; a=") && | |
1205 | pdkim_strcat(hdr,pdkim_algos[sig->algo]) && | |
1206 | pdkim_strcat(hdr,"; q=") && | |
1207 | pdkim_strcat(hdr,pdkim_querymethods[sig->querymethod]) && | |
1208 | pdkim_strcat(hdr,"; c=") && | |
1209 | pdkim_strcat(hdr,pdkim_canons[sig->canon_headers]) && | |
1210 | pdkim_strcat(hdr,"/") && | |
1211 | pdkim_strcat(hdr,pdkim_canons[sig->canon_body]) && | |
1212 | pdkim_strcat(hdr,"; d=") && | |
1213 | pdkim_strcat(hdr,sig->domain) && | |
1214 | pdkim_strcat(hdr,"; s=") && | |
1215 | pdkim_strcat(hdr,sig->selector) && | |
1216 | pdkim_strcat(hdr,";\r\n\th=") && | |
1217 | pdkim_strcat(hdr,sig->headernames) && | |
1218 | pdkim_strcat(hdr,"; bh=") && | |
1219 | pdkim_strcat(hdr,base64_bh) && | |
1220 | pdkim_strcat(hdr,";\r\n\t") | |
1221 | ) { | |
1222 | /* Optional bits */ | |
1223 | if (sig->identity != NULL) { | |
1224 | if (!( pdkim_strcat(hdr,"i=") && | |
1225 | pdkim_strcat(hdr,sig->identity) && | |
1226 | pdkim_strcat(hdr,";") ) ) { | |
1227 | goto BAIL; | |
1228 | } | |
1229 | } | |
1230 | if (sig->created > 0) { | |
1231 | if (!( pdkim_strcat(hdr,"t=") && | |
1232 | pdkim_numcat(hdr,sig->created) && | |
1233 | pdkim_strcat(hdr,";") ) ) { | |
1234 | goto BAIL; | |
1235 | } | |
1236 | } | |
1237 | if (sig->expires > 0) { | |
1238 | if (!( pdkim_strcat(hdr,"x=") && | |
1239 | pdkim_numcat(hdr,sig->expires) && | |
1240 | pdkim_strcat(hdr,";") ) ) { | |
1241 | goto BAIL; | |
1242 | } | |
1243 | } | |
1244 | if (sig->bodylength >= 0) { | |
1245 | if (!( pdkim_strcat(hdr,"l=") && | |
1246 | pdkim_numcat(hdr,sig->bodylength) && | |
1247 | pdkim_strcat(hdr,";") ) ) { | |
1248 | goto BAIL; | |
1249 | } | |
1250 | } | |
1251 | /* Extra linebreak */ | |
1252 | if (hdr->str[(hdr->len)-1] == ';') { | |
1253 | if (!pdkim_strcat(hdr," \r\n\t")) goto BAIL; | |
1254 | } | |
1255 | /* Preliminary or final version? */ | |
1256 | if (final) { | |
1257 | base64_b = pdkim_encode_base64(sig->sigdata, sig->sigdata_len); | |
1258 | if (base64_b == NULL) goto BAIL; | |
1259 | if ( | |
1260 | pdkim_strcat(hdr,"b=") && | |
1261 | pdkim_strcat(hdr,base64_b) && | |
1262 | pdkim_strcat(hdr,";") | |
1263 | ) goto DONE; | |
1264 | } | |
1265 | else { | |
1266 | if (pdkim_strcat(hdr,"b=;")) goto DONE; | |
1267 | } | |
1268 | ||
1269 | goto BAIL; | |
1270 | } | |
1271 | ||
1272 | DONE: | |
1273 | rc = strdup(hdr->str); | |
1274 | ||
1275 | BAIL: | |
1276 | pdkim_strfree(hdr); | |
1277 | if (base64_bh != NULL) free(base64_bh); | |
1278 | if (base64_b != NULL) free(base64_b); | |
1279 | return rc; | |
1280 | } | |
1281 | ||
1282 | ||
1283 | /* -------------------------------------------------------------------------- */ | |
1284 | DLLEXPORT int pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatures) { | |
1285 | pdkim_signature *sig = ctx->sig; | |
1286 | pdkim_str *headernames = NULL; /* Collected signed header names */ | |
1287 | ||
1288 | /* Check if we must still flush a (partial) header. If that is the | |
1289 | case, the message has no body, and we must compute a body hash | |
1290 | out of '<CR><LF>' */ | |
90204638 | 1291 | if (ctx->cur_header && ctx->cur_header->len) { |
80a47a2c TK |
1292 | int rc = pdkim_header_complete(ctx); |
1293 | if (rc != PDKIM_OK) return rc; | |
1294 | pdkim_update_bodyhash(ctx,"\r\n",2); | |
1295 | } | |
1296 | else { | |
1297 | /* For non-smtp input, check if there's an unfinished line in the | |
1298 | body line buffer. If that is the case, we must add a CRLF to the | |
1299 | hash to properly terminate the message. */ | |
1300 | if ((ctx->input_mode == PDKIM_INPUT_NORMAL) && ctx->linebuf_offset) { | |
1301 | pdkim_update_bodyhash(ctx, ctx->linebuf, ctx->linebuf_offset); | |
1302 | pdkim_update_bodyhash(ctx,"\r\n",2); | |
1303 | } | |
1304 | #ifdef PDKIM_DEBUG | |
1305 | if (ctx->debug_stream) | |
1306 | fprintf(ctx->debug_stream, | |
ff7ddfd7 | 1307 | "\nPDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); |
80a47a2c TK |
1308 | #endif |
1309 | } | |
1310 | ||
1311 | /* Build (and/or evaluate) body hash */ | |
1312 | if (pdkim_finish_bodyhash(ctx) != PDKIM_OK) return PDKIM_ERR_OOM; | |
1313 | ||
1314 | /* SIGNING -------------------------------------------------------------- */ | |
1315 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1316 | headernames = pdkim_strnew(NULL); | |
1317 | if (headernames == NULL) return PDKIM_ERR_OOM; | |
1318 | } | |
1319 | /* ---------------------------------------------------------------------- */ | |
1320 | ||
1321 | while (sig != NULL) { | |
1322 | sha1_context sha1_headers; | |
1323 | sha2_context sha2_headers; | |
1324 | char *sig_hdr; | |
1325 | char headerhash[32]; | |
1326 | ||
1327 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
1328 | sha1_starts(&sha1_headers); | |
1329 | else | |
1330 | sha2_starts(&sha2_headers,0); | |
1331 | ||
1332 | #ifdef PDKIM_DEBUG | |
1333 | if (ctx->debug_stream) | |
1334 | fprintf(ctx->debug_stream, | |
1335 | "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n"); | |
1336 | #endif | |
1337 | ||
1338 | /* SIGNING ---------------------------------------------------------------- */ | |
1339 | /* When signing, walk through our header list and add them to the hash. As we | |
1340 | go, construct a list of the header's names to use for the h= parameter. */ | |
1341 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1342 | pdkim_stringlist *p = sig->headers; | |
1343 | while (p != NULL) { | |
1344 | char *rh = NULL; | |
1345 | /* Collect header names (Note: colon presence is guaranteed here) */ | |
1346 | char *q = strchr(p->value,':'); | |
1347 | if (pdkim_strncat(headernames, p->value, | |
1348 | (q-(p->value))+((p->next==NULL)?0:1)) == NULL) | |
1349 | return PDKIM_ERR_OOM; | |
1350 | ||
1351 | if (sig->canon_headers == PDKIM_CANON_RELAXED) | |
1352 | rh = pdkim_relax_header(p->value,1); /* cook header for relaxed canon */ | |
1353 | else | |
1354 | rh = strdup(p->value); /* just copy it for simple canon */ | |
1355 | ||
1356 | if (rh == NULL) return PDKIM_ERR_OOM; | |
1357 | ||
1358 | /* Feed header to the hash algorithm */ | |
1359 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
1360 | sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh)); | |
1361 | else | |
1362 | sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh)); | |
1363 | #ifdef PDKIM_DEBUG | |
1364 | if (ctx->debug_stream) | |
1365 | pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1); | |
1366 | #endif | |
1367 | free(rh); | |
1368 | p = p->next; | |
1369 | } | |
1370 | } | |
1371 | /* VERIFICATION ----------------------------------------------------------- */ | |
1372 | /* When verifying, walk through the header name list in the h= parameter and | |
1373 | add the headers to the hash in that order. */ | |
1374 | else { | |
1375 | char *b = strdup(sig->headernames); | |
1376 | char *p = b; | |
1377 | char *q = NULL; | |
1378 | if (b == NULL) return PDKIM_ERR_OOM; | |
1379 | ||
1380 | while(1) { | |
1381 | pdkim_stringlist *hdrs = sig->headers; | |
1382 | q = strchr(p,':'); | |
1383 | if (q != NULL) *q = '\0'; | |
1384 | while (hdrs != NULL) { | |
97713345 TK |
1385 | if ( (strncasecmp(hdrs->value,p,strlen(p)) == 0) && |
1386 | ((hdrs->value)[strlen(p)] == ':') ) { | |
80a47a2c TK |
1387 | char *rh = NULL; |
1388 | if (sig->canon_headers == PDKIM_CANON_RELAXED) | |
1389 | rh = pdkim_relax_header(hdrs->value,1); /* cook header for relaxed canon */ | |
1390 | else | |
1391 | rh = strdup(hdrs->value); /* just copy it for simple canon */ | |
1392 | if (rh == NULL) return PDKIM_ERR_OOM; | |
1393 | /* Feed header to the hash algorithm */ | |
1394 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) | |
1395 | sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh)); | |
1396 | else | |
1397 | sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh)); | |
1398 | #ifdef PDKIM_DEBUG | |
1399 | if (ctx->debug_stream) | |
1400 | pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1); | |
1401 | #endif | |
1402 | free(rh); | |
97713345 TK |
1403 | (hdrs->value)[0] = '_'; |
1404 | break; | |
80a47a2c TK |
1405 | } |
1406 | hdrs = hdrs->next; | |
1407 | } | |
1408 | if (q == NULL) break; | |
1409 | p = q+1; | |
1410 | } | |
1411 | free(b); | |
1412 | } | |
1413 | ||
1414 | #ifdef PDKIM_DEBUG | |
1415 | if (ctx->debug_stream) | |
1416 | fprintf(ctx->debug_stream, | |
1417 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1418 | #endif | |
1419 | ||
1420 | /* SIGNING ---------------------------------------------------------------- */ | |
1421 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1422 | /* Copy headernames to signature struct */ | |
1423 | sig->headernames = strdup(headernames->str); | |
1424 | pdkim_strfree(headernames); | |
1425 | ||
1426 | /* Create signature header with b= omitted */ | |
1427 | sig_hdr = pdkim_create_header(ctx->sig,0); | |
1428 | } | |
1429 | /* VERIFICATION ----------------------------------------------------------- */ | |
1430 | else { | |
1431 | sig_hdr = strdup(sig->rawsig_no_b_val); | |
1432 | } | |
1433 | /* ------------------------------------------------------------------------ */ | |
1434 | ||
1435 | if (sig_hdr == NULL) return PDKIM_ERR_OOM; | |
1436 | ||
1437 | /* Relax header if necessary */ | |
1438 | if (sig->canon_headers == PDKIM_CANON_RELAXED) { | |
1439 | char *relaxed_hdr = pdkim_relax_header(sig_hdr,0); | |
1440 | free(sig_hdr); | |
1441 | if (relaxed_hdr == NULL) return PDKIM_ERR_OOM; | |
1442 | sig_hdr = relaxed_hdr; | |
1443 | } | |
1444 | ||
1445 | #ifdef PDKIM_DEBUG | |
1446 | if (ctx->debug_stream) { | |
1447 | fprintf(ctx->debug_stream, | |
1448 | "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n"); | |
1449 | pdkim_quoteprint(ctx->debug_stream, sig_hdr, strlen(sig_hdr), 1); | |
1450 | fprintf(ctx->debug_stream, | |
1451 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1452 | } | |
1453 | #endif | |
1454 | ||
1455 | /* Finalize header hash */ | |
1456 | if (sig->algo == PDKIM_ALGO_RSA_SHA1) { | |
1457 | sha1_update(&(sha1_headers),(unsigned char *)sig_hdr,strlen(sig_hdr)); | |
1458 | sha1_finish(&(sha1_headers),(unsigned char *)headerhash); | |
1459 | #ifdef PDKIM_DEBUG | |
1460 | if (ctx->debug_stream) { | |
1461 | fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain); | |
1462 | pdkim_hexprint(ctx->debug_stream, headerhash, 20, 1); | |
1463 | } | |
1464 | #endif | |
1465 | } | |
1466 | else { | |
1467 | sha2_update(&(sha2_headers),(unsigned char *)sig_hdr,strlen(sig_hdr)); | |
1468 | sha2_finish(&(sha2_headers),(unsigned char *)headerhash); | |
1469 | #ifdef PDKIM_DEBUG | |
1470 | if (ctx->debug_stream) { | |
1471 | fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain); | |
1472 | pdkim_hexprint(ctx->debug_stream, headerhash, 32, 1); | |
1473 | } | |
1474 | #endif | |
1475 | } | |
1476 | ||
1477 | free(sig_hdr); | |
1478 | ||
1479 | /* SIGNING ---------------------------------------------------------------- */ | |
1480 | if (ctx->mode == PDKIM_MODE_SIGN) { | |
1481 | rsa_context rsa; | |
1482 | ||
1483 | rsa_init(&rsa,RSA_PKCS_V15,0,NULL,NULL); | |
1484 | ||
1485 | /* Perform private key operation */ | |
1486 | if (rsa_parse_key(&rsa, (unsigned char *)sig->rsa_privkey, | |
1487 | strlen(sig->rsa_privkey), NULL, 0) != 0) { | |
1488 | return PDKIM_ERR_RSA_PRIVKEY; | |
1489 | } | |
1490 | ||
1491 | sig->sigdata_len = mpi_size(&(rsa.N)); | |
1492 | sig->sigdata = malloc(sig->sigdata_len); | |
1493 | if (sig->sigdata == NULL) return PDKIM_ERR_OOM; | |
1494 | ||
1495 | if (rsa_pkcs1_sign( &rsa, RSA_PRIVATE, | |
1496 | ((sig->algo == PDKIM_ALGO_RSA_SHA1)? | |
1497 | RSA_SHA1:RSA_SHA256), | |
1498 | 0, | |
1499 | (unsigned char *)headerhash, | |
1500 | (unsigned char *)sig->sigdata ) != 0) { | |
1501 | return PDKIM_ERR_RSA_SIGNING; | |
1502 | } | |
1503 | ||
1504 | rsa_free(&rsa); | |
1505 | ||
1506 | #ifdef PDKIM_DEBUG | |
1507 | if (ctx->debug_stream) { | |
1508 | fprintf(ctx->debug_stream, "PDKIM [%s] b computed: ", | |
1509 | sig->domain); | |
1510 | pdkim_hexprint(ctx->debug_stream, sig->sigdata, sig->sigdata_len, 1); | |
1511 | } | |
1512 | #endif | |
1513 | ||
1514 | sig->signature_header = pdkim_create_header(ctx->sig,1); | |
1515 | if (sig->signature_header == NULL) return PDKIM_ERR_OOM; | |
1516 | } | |
1517 | /* VERIFICATION ----------------------------------------------------------- */ | |
1518 | else { | |
1519 | rsa_context rsa; | |
1520 | char *dns_txt_name, *dns_txt_reply; | |
1521 | ||
1522 | rsa_init(&rsa,RSA_PKCS_V15,0,NULL,NULL); | |
1523 | ||
1524 | dns_txt_name = malloc(PDKIM_DNS_TXT_MAX_NAMELEN); | |
1525 | if (dns_txt_name == NULL) return PDKIM_ERR_OOM; | |
1526 | dns_txt_reply = malloc(PDKIM_DNS_TXT_MAX_RECLEN); | |
1527 | if (dns_txt_reply == NULL) { | |
1528 | free(dns_txt_name); | |
1529 | return PDKIM_ERR_OOM; | |
1530 | } | |
1531 | memset(dns_txt_reply,0,PDKIM_DNS_TXT_MAX_RECLEN); | |
1532 | memset(dns_txt_name ,0,PDKIM_DNS_TXT_MAX_NAMELEN); | |
1533 | ||
1534 | if (snprintf(dns_txt_name,PDKIM_DNS_TXT_MAX_NAMELEN, | |
1535 | "%s._domainkey.%s.", | |
1536 | sig->selector,sig->domain) >= PDKIM_DNS_TXT_MAX_NAMELEN) { | |
1537 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1538 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_BUFFER_SIZE; | |
1539 | goto NEXT_VERIFY; | |
6ab02e3f | 1540 | } |
80a47a2c TK |
1541 | |
1542 | if ((ctx->dns_txt_callback(dns_txt_name, dns_txt_reply) != PDKIM_OK) || | |
1543 | (dns_txt_reply[0] == '\0')) { | |
1544 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1545 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE; | |
1546 | goto NEXT_VERIFY; | |
1547 | } | |
1548 | ||
1549 | #ifdef PDKIM_DEBUG | |
1550 | if (ctx->debug_stream) { | |
1551 | fprintf(ctx->debug_stream, | |
1552 | "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1553 | fprintf(ctx->debug_stream,"Raw record: "); | |
1554 | pdkim_quoteprint(ctx->debug_stream, dns_txt_reply, strlen(dns_txt_reply), 1); | |
1555 | } | |
1556 | #endif | |
1557 | ||
1558 | sig->pubkey = pdkim_parse_pubkey_record(ctx,dns_txt_reply); | |
1559 | if (sig->pubkey == NULL) { | |
1560 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1561 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING; | |
1562 | #ifdef PDKIM_DEBUG | |
1563 | if (ctx->debug_stream) { | |
1564 | fprintf(ctx->debug_stream,"Error while parsing public key record\n"); | |
1565 | fprintf(ctx->debug_stream, | |
1566 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1567 | } | |
1568 | #endif | |
1569 | goto NEXT_VERIFY; | |
1570 | } | |
1571 | ||
1572 | #ifdef PDKIM_DEBUG | |
1573 | if (ctx->debug_stream) { | |
1574 | fprintf(ctx->debug_stream, | |
1575 | "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); | |
1576 | } | |
1577 | #endif | |
1578 | ||
1579 | if (rsa_parse_public_key(&rsa, | |
1580 | (unsigned char *)sig->pubkey->key, | |
1581 | sig->pubkey->key_len) != 0) { | |
1582 | sig->verify_status = PDKIM_VERIFY_INVALID; | |
1583 | sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING; | |
1584 | goto NEXT_VERIFY; | |
1585 | } | |
1586 | ||
1587 | /* Check the signature */ | |
1588 | if (rsa_pkcs1_verify(&rsa, | |
1589 | RSA_PUBLIC, | |
1590 | ((sig->algo == PDKIM_ALGO_RSA_SHA1)? | |
1591 | RSA_SHA1:RSA_SHA256), | |
1592 | 0, | |
1593 | (unsigned char *)headerhash, | |
1594 | (unsigned char *)sig->sigdata) != 0) { | |
1595 | sig->verify_status = PDKIM_VERIFY_FAIL; | |
1596 | sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE; | |
80a47a2c TK |
1597 | goto NEXT_VERIFY; |
1598 | } | |
1599 | ||
ff7ddfd7 TK |
1600 | /* We have a winner! (if bodydhash was correct earlier) */ |
1601 | if (sig->verify_status == PDKIM_VERIFY_NONE) { | |
1602 | sig->verify_status = PDKIM_VERIFY_PASS; | |
1603 | } | |
1604 | ||
1605 | NEXT_VERIFY: | |
80a47a2c TK |
1606 | |
1607 | #ifdef PDKIM_DEBUG | |
1608 | if (ctx->debug_stream) { | |
ff7ddfd7 TK |
1609 | fprintf(ctx->debug_stream, "PDKIM [%s] signature status: %s", |
1610 | sig->domain, pdkim_verify_status_str(sig->verify_status)); | |
1611 | if (sig->verify_ext_status > 0) { | |
1612 | fprintf(ctx->debug_stream, " (%s)\n", | |
1613 | pdkim_verify_ext_status_str(sig->verify_ext_status)); | |
1614 | } | |
1615 | else { | |
1616 | fprintf(ctx->debug_stream, "\n"); | |
1617 | } | |
80a47a2c TK |
1618 | } |
1619 | #endif | |
1620 | ||
80a47a2c TK |
1621 | rsa_free(&rsa); |
1622 | free(dns_txt_name); | |
1623 | free(dns_txt_reply); | |
1624 | } | |
1625 | ||
1626 | sig = sig->next; | |
1627 | } | |
1628 | ||
1629 | /* If requested, set return pointer to signature(s) */ | |
1630 | if (return_signatures != NULL) { | |
1631 | *return_signatures = ctx->sig; | |
1632 | } | |
1633 | ||
1634 | return PDKIM_OK; | |
1635 | } | |
1636 | ||
1637 | ||
1638 | /* -------------------------------------------------------------------------- */ | |
1639 | DLLEXPORT pdkim_ctx *pdkim_init_verify(int input_mode, | |
1640 | int(*dns_txt_callback)(char *, char *) | |
1641 | ) { | |
1642 | pdkim_ctx *ctx = malloc(sizeof(pdkim_ctx)); | |
1643 | if (ctx == NULL) return NULL; | |
1644 | memset(ctx,0,sizeof(pdkim_ctx)); | |
1645 | ||
1646 | ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN); | |
1647 | if (ctx->linebuf == NULL) { | |
1648 | free(ctx); | |
1649 | return NULL; | |
1650 | } | |
1651 | ||
1652 | ctx->mode = PDKIM_MODE_VERIFY; | |
1653 | ctx->input_mode = input_mode; | |
1654 | ctx->dns_txt_callback = dns_txt_callback; | |
1655 | ||
1656 | return ctx; | |
1657 | } | |
1658 | ||
1659 | ||
1660 | /* -------------------------------------------------------------------------- */ | |
1661 | DLLEXPORT pdkim_ctx *pdkim_init_sign(int input_mode, | |
1662 | char *domain, | |
1663 | char *selector, | |
1664 | char *rsa_privkey) { | |
1665 | pdkim_ctx *ctx; | |
1666 | pdkim_signature *sig; | |
1667 | ||
1668 | if (!domain || !selector || !rsa_privkey) return NULL; | |
1669 | ||
1670 | ctx = malloc(sizeof(pdkim_ctx)); | |
1671 | if (ctx == NULL) return NULL; | |
1672 | memset(ctx,0,sizeof(pdkim_ctx)); | |
1673 | ||
1674 | ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN); | |
1675 | if (ctx->linebuf == NULL) { | |
1676 | free(ctx); | |
1677 | return NULL; | |
1678 | } | |
1679 | ||
1680 | sig = malloc(sizeof(pdkim_signature)); | |
1681 | if (sig == NULL) { | |
1682 | free(ctx->linebuf); | |
1683 | free(ctx); | |
1684 | return NULL; | |
1685 | } | |
1686 | memset(sig,0,sizeof(pdkim_signature)); | |
1687 | sig->bodylength = -1; | |
1688 | ||
1689 | ctx->mode = PDKIM_MODE_SIGN; | |
1690 | ctx->input_mode = input_mode; | |
1691 | ctx->sig = sig; | |
1692 | ||
1693 | ctx->sig->domain = strdup(domain); | |
1694 | ctx->sig->selector = strdup(selector); | |
1695 | ctx->sig->rsa_privkey = strdup(rsa_privkey); | |
1696 | ||
1697 | if (!ctx->sig->domain || !ctx->sig->selector || !ctx->sig->rsa_privkey) { | |
1698 | pdkim_free_ctx(ctx); | |
1699 | return NULL; | |
1700 | } | |
1701 | ||
1702 | ctx->sig->sha1_body = malloc(sizeof(sha1_context)); | |
1703 | if (ctx->sig->sha1_body == NULL) { | |
1704 | pdkim_free_ctx(ctx); | |
1705 | return NULL; | |
1706 | } | |
1707 | sha1_starts(ctx->sig->sha1_body); | |
1708 | ||
1709 | ctx->sig->sha2_body = malloc(sizeof(sha2_context)); | |
1710 | if (ctx->sig->sha2_body == NULL) { | |
1711 | pdkim_free_ctx(ctx); | |
1712 | return NULL; | |
1713 | } | |
1714 | sha2_starts(ctx->sig->sha2_body,0); | |
1715 | ||
1716 | return ctx; | |
6ab02e3f | 1717 | } |
80a47a2c TK |
1718 | |
1719 | #ifdef PDKIM_DEBUG | |
1720 | /* -------------------------------------------------------------------------- */ | |
1721 | DLLEXPORT void pdkim_set_debug_stream(pdkim_ctx *ctx, | |
1722 | FILE *debug_stream) { | |
1723 | ctx->debug_stream = debug_stream; | |
6ab02e3f | 1724 | } |
80a47a2c TK |
1725 | #endif |
1726 | ||
1727 | /* -------------------------------------------------------------------------- */ | |
1728 | DLLEXPORT int pdkim_set_optional(pdkim_ctx *ctx, | |
1729 | char *sign_headers, | |
1730 | char *identity, | |
1731 | int canon_headers, | |
1732 | int canon_body, | |
1733 | long bodylength, | |
1734 | int algo, | |
1735 | unsigned long created, | |
1736 | unsigned long expires) { | |
1737 | ||
1738 | if (identity != NULL) { | |
1739 | ctx->sig->identity = strdup(identity); | |
1740 | if (ctx->sig->identity == NULL) return PDKIM_ERR_OOM; | |
1741 | } | |
1742 | ||
1743 | if (sign_headers != NULL) { | |
1744 | ctx->sig->sign_headers = strdup(sign_headers); | |
1745 | if (ctx->sig->sign_headers == NULL) return PDKIM_ERR_OOM; | |
1746 | } | |
1747 | ||
1748 | ctx->sig->canon_headers = canon_headers; | |
1749 | ctx->sig->canon_body = canon_body; | |
1750 | ctx->sig->bodylength = bodylength; | |
1751 | ctx->sig->algo = algo; | |
1752 | ctx->sig->created = created; | |
1753 | ctx->sig->expires = expires; | |
1754 | ||
1755 | return PDKIM_OK; | |
6ab02e3f | 1756 | } |