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TLS authenticator
[exim.git] / src / src / pdkim / pdkim.c
CommitLineData
80a47a2c
TK		 1/*
2 * PDKIM - a RFC4871 (DKIM) implementation
3 *
c4ceed07 4 * Copyright (C) 2009 - 2012 Tom Kistner <tom@duncanthrax.net>
80a47a2c
TK		 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
80a47a2c
TK		 23#include <stdlib.h>
24#include <stdio.h>
25#include <string.h>
26#include <ctype.h>
27
28#include "pdkim.h"
29
30#include "sha1.h"
31#include "sha2.h"
32#include "rsa.h"
33#include "base64.h"
34
35#define PDKIM_SIGNATURE_VERSION "1"
36#define PDKIM_PUB_RECORD_VERSION "DKIM1"
37
38#define PDKIM_MAX_HEADER_LEN 65536
39#define PDKIM_MAX_HEADERS 512
40#define PDKIM_MAX_BODY_LINE_LEN 16384
41#define PDKIM_DNS_TXT_MAX_NAMELEN 1024
42#define PDKIM_DEFAULT_SIGN_HEADERS "From:Sender:Reply-To:Subject:Date:"\
43 "Message-ID:To:Cc:MIME-Version:Content-Type:"\
44 "Content-Transfer-Encoding:Content-ID:"\
45 "Content-Description:Resent-Date:Resent-From:"\
46 "Resent-Sender:Resent-To:Resent-Cc:"\
47 "Resent-Message-ID:In-Reply-To:References:"\
48 "List-Id:List-Help:List-Unsubscribe:"\
49 "List-Subscribe:List-Post:List-Owner:List-Archive"
50
51/* -------------------------------------------------------------------------- */
52struct pdkim_stringlist {
53 char *value;
37f8b554 54 int tag;
80a47a2c
TK		 55 void *next;
56};
57
58#define PDKIM_STR_ALLOC_FRAG 256
59struct pdkim_str {
60 char *str;
61 unsigned int len;
62 unsigned int allocated;
63};
64
65/* -------------------------------------------------------------------------- */
66/* A bunch of list constants */
1ba28e2b 67const char *pdkim_querymethods[] = {
80a47a2c
TK		 68 "dns/txt",
69 NULL
70};
1ba28e2b 71const char *pdkim_algos[] = {
80a47a2c
TK		 72 "rsa-sha256",
73 "rsa-sha1",
74 NULL
75};
1ba28e2b 76const char *pdkim_canons[] = {
80a47a2c
TK		 77 "simple",
78 "relaxed",
79 NULL
80};
1ba28e2b 81const char *pdkim_hashes[] = {
80a47a2c
TK		 82 "sha256",
83 "sha1",
84 NULL
85};
1ba28e2b 86const char *pdkim_keytypes[] = {
80a47a2c
TK		 87 "rsa",
88 NULL
89};
90
91typedef struct pdkim_combined_canon_entry {
1ba28e2b 92 const char *str;
80a47a2c
TK		 93 int canon_headers;
94 int canon_body;
95} pdkim_combined_canon_entry;
96pdkim_combined_canon_entry pdkim_combined_canons[] = {
97 { "simple/simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE },
98 { "simple/relaxed", PDKIM_CANON_SIMPLE, PDKIM_CANON_RELAXED },
99 { "relaxed/simple", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE },
100 { "relaxed/relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_RELAXED },
101 { "simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE },
102 { "relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE },
103 { NULL, 0, 0 }
104};
105
106
1ba28e2b 107const char *pdkim_verify_status_str(int status) {
ff7ddfd7
TK		 108 switch(status) {
109 case PDKIM_VERIFY_NONE: return "PDKIM_VERIFY_NONE";
110 case PDKIM_VERIFY_INVALID: return "PDKIM_VERIFY_INVALID";
111 case PDKIM_VERIFY_FAIL: return "PDKIM_VERIFY_FAIL";
112 case PDKIM_VERIFY_PASS: return "PDKIM_VERIFY_PASS";
113 default: return "PDKIM_VERIFY_UNKNOWN";
114 }
115}
1ba28e2b 116const char *pdkim_verify_ext_status_str(int ext_status) {
ff7ddfd7
TK		 117 switch(ext_status) {
118 case PDKIM_VERIFY_FAIL_BODY: return "PDKIM_VERIFY_FAIL_BODY";
119 case PDKIM_VERIFY_FAIL_MESSAGE: return "PDKIM_VERIFY_FAIL_MESSAGE";
120 case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE";
121 case PDKIM_VERIFY_INVALID_BUFFER_SIZE: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE";
122 case PDKIM_VERIFY_INVALID_PUBKEY_PARSING: return "PDKIM_VERIFY_INVALID_PUBKEY_PARSING";
123 default: return "PDKIM_VERIFY_UNKNOWN";
124 }
125}
126
127
80a47a2c
TK		 128/* -------------------------------------------------------------------------- */
129/* Print debugging functions */
130#ifdef PDKIM_DEBUG
1ba28e2b 131void pdkim_quoteprint(FILE *stream, const char *data, int len, int lf) {
80a47a2c 132 int i;
1ba28e2b 133 const unsigned char *p = (const unsigned char *)data;
80a47a2c
TK		 134
135 for (i=0;i<len;i++) {
1ba28e2b 136 const int c = p[i];
80a47a2c
TK		 137 switch (c) {
138 case ' ' : fprintf(stream,"{SP}"); break;
139 case '\t': fprintf(stream,"{TB}"); break;
140 case '\r': fprintf(stream,"{CR}"); break;
141 case '\n': fprintf(stream,"{LF}"); break;
142 case '{' : fprintf(stream,"{BO}"); break;
143 case '}' : fprintf(stream,"{BC}"); break;
144 default:
145 if ( (c < 32) || (c > 127) )
146 fprintf(stream,"{%02x}",c);
147 else
148 fputc(c,stream);
149 break;
150 }
151 }
152 if (lf)
153 fputc('\n',stream);
154}
1ba28e2b 155void pdkim_hexprint(FILE *stream, const char *data, int len, int lf) {
80a47a2c 156 int i;
1ba28e2b 157 const unsigned char *p = (const unsigned char *)data;
80a47a2c
TK		 158
159 for (i=0;i<len;i++) {
1ba28e2b 160 const int c = p[i];
80a47a2c
TK		 161 fprintf(stream,"%02x",c);
162 }
163 if (lf)
164 fputc('\n',stream);
165}
166#endif
167
168
169/* -------------------------------------------------------------------------- */
170/* Simple string list implementation for convinience */
171pdkim_stringlist *pdkim_append_stringlist(pdkim_stringlist *base, char *str) {
172 pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist));
173 if (new_entry == NULL) return NULL;
174 memset(new_entry,0,sizeof(pdkim_stringlist));
175 new_entry->value = strdup(str);
176 if (new_entry->value == NULL) return NULL;
177 if (base != NULL) {
178 pdkim_stringlist *last = base;
6ab02e3f 179 while (last->next != NULL) { last = last->next; }
80a47a2c
TK		 180 last->next = new_entry;
181 return base;
182 }
183 else return new_entry;
6ab02e3f 184}
97713345
TK		 185pdkim_stringlist *pdkim_prepend_stringlist(pdkim_stringlist *base, char *str) {
186 pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist));
187 if (new_entry == NULL) return NULL;
188 memset(new_entry,0,sizeof(pdkim_stringlist));
189 new_entry->value = strdup(str);
190 if (new_entry->value == NULL) return NULL;
191 if (base != NULL) {
192 new_entry->next = base;
193 }
194 return new_entry;
6ab02e3f 195}
80a47a2c
TK		 196
197
198/* -------------------------------------------------------------------------- */
199/* A small "growing string" implementation to escape malloc/realloc hell */
1ba28e2b 200pdkim_str *pdkim_strnew (const char *cstr) {
80a47a2c
TK		 201 unsigned int len = cstr?strlen(cstr):0;
202 pdkim_str *p = malloc(sizeof(pdkim_str));
203 if (p == NULL) return NULL;
204 memset(p,0,sizeof(pdkim_str));
205 p->str = malloc(len+1);
206 if (p->str == NULL) {
207 free(p);
208 return NULL;
209 }
210 p->allocated=(len+1);
211 p->len=len;
212 if (cstr) strcpy(p->str,cstr);
13f492fc 213 else p->str[p->len] = '\0';
80a47a2c 214 return p;
6ab02e3f 215}
1ba28e2b 216char *pdkim_strncat(pdkim_str *str, const char *data, int len) {
80a47a2c
TK		 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}
1ba28e2b 231char *pdkim_strcat(pdkim_str *str, const char *cstr) {
80a47a2c 232 return pdkim_strncat(str, cstr, strlen(cstr));
6ab02e3f 233}
05b7d6de 234
80a47a2c
TK		 235char *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		 240char *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		 253char *pdkim_strclear(pdkim_str *str) {
254 str->str[0] = '\0';
255 str->len = 0;
256 return str->str;
6ab02e3f 257}
80a47a2c
TK		 258void 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/* -------------------------------------------------------------------------- */
267void 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/* -------------------------------------------------------------------------- */
282void 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);
80a47a2c
TK		 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/* -------------------------------------------------------------------------- */
316DLLEXPORT void pdkim_free_ctx(pdkim_ctx *ctx) {
317 if (ctx) {
37f8b554
TK		 318 pdkim_stringlist *e = ctx->headers;
319 while(e != NULL) {
320 pdkim_stringlist *c = e;
321 if (e->value != NULL) free(e->value);
322 e = e->next;
323 free(c);
324 }
80a47a2c
TK		 325 pdkim_free_sig(ctx->sig);
326 pdkim_strfree(ctx->cur_header);
327 free(ctx);
328 }
6ab02e3f 329}
80a47a2c
TK		 330
331
332/* -------------------------------------------------------------------------- */
333/* Matches the name of the passed raw "header" against
334 the passed colon-separated "list", starting at entry
335 "start". Returns the position of the header name in
336 the list. */
1ba28e2b
PP		 337int header_name_match(const char *header,
338 char *tick,
339 int do_tick) {
80a47a2c
TK		 340 char *hname;
341 char *lcopy;
342 char *p;
343 char *q;
344 int rc = PDKIM_FAIL;
345
346 /* Get header name */
347 char *hcolon = strchr(header,':');
348 if (hcolon == NULL) return rc; /* This isn't a header */
349 hname = malloc((hcolon-header)+1);
350 if (hname == NULL) return PDKIM_ERR_OOM;
351 memset(hname,0,(hcolon-header)+1);
352 strncpy(hname,header,(hcolon-header));
353
354 /* Copy tick-off list locally, so we can punch zeroes into it */
355 lcopy = strdup(tick);
356 if (lcopy == NULL) {
357 free(hname);
358 return PDKIM_ERR_OOM;
359 }
360 p = lcopy;
361 q = strchr(p,':');
362 while (q != NULL) {
363 *q = '\0';
364
365 if (strcasecmp(p,hname) == 0) {
366 rc = PDKIM_OK;
367 /* Invalidate header name instance in tick-off list */
368 if (do_tick) tick[p-lcopy] = '_';
369 goto BAIL;
370 }
371
372 p = q+1;
373 q = strchr(p,':');
374 }
375
376 if (strcasecmp(p,hname) == 0) {
377 rc = PDKIM_OK;
378 /* Invalidate header name instance in tick-off list */
379 if (do_tick) tick[p-lcopy] = '_';
380 }
381
382 BAIL:
383 free(hname);
384 free(lcopy);
385 return rc;
386}
387
388
389/* -------------------------------------------------------------------------- */
390/* Performs "relaxed" canonicalization of a header. The returned pointer needs
391 to be free()d. */
392char *pdkim_relax_header (char *header, int crlf) {
393 int past_field_name = 0;
394 int seen_wsp = 0;
395 char *p = header;
396 char *q;
a7921bbe 397 char *relaxed = malloc(strlen(header)+3);
80a47a2c
TK		 398 if (relaxed == NULL) return NULL;
399 q = relaxed;
400 while (*p != '\0') {
401 int c = *p;
402 /* Ignore CR & LF */
403 if ( (c == '\r') || (c == '\n') ) {
404 p++;
405 continue;
406 }
407 if ( (c == '\t') || (c == ' ') ) {
408 c = ' '; /* Turns WSP into SP */
409 if (seen_wsp) {
410 p++;
411 continue;
412 }
413 else seen_wsp = 1;
414 }
415 else {
416 if ( (!past_field_name) && (c == ':') ) {
417 if (seen_wsp) q--; /* This removes WSP before the colon */
418 seen_wsp = 1; /* This removes WSP after the colon */
419 past_field_name = 1;
420 }
421 else seen_wsp = 0;
422 }
423 /* Lowercase header name */
424 if (!past_field_name) c = tolower(c);
425 *q = c;
426 p++;
427 q++;
428 }
ab42bd23 429 if ((q>relaxed) && (*(q-1) == ' ')) q--; /* Squash eventual trailing SP */
80a47a2c
TK		 430 *q = '\0';
431 if (crlf) strcat(relaxed,"\r\n");
432 return relaxed;
6ab02e3f 433}
80a47a2c
TK		 434
435
436/* -------------------------------------------------------------------------- */
437#define PDKIM_QP_ERROR_DECODE -1
438char *pdkim_decode_qp_char(char *qp_p, int *c) {
439 char *initial_pos = qp_p;
440
441 /* Advance one char */
442 qp_p++;
443
444 /* Check for two hex digits and decode them */
445 if (isxdigit(*qp_p) && isxdigit(qp_p[1])) {
446 /* Do hex conversion */
447 if (isdigit(*qp_p)) {*c = *qp_p - '0';}
6ab02e3f 448 else {*c = toupper(*qp_p) - 'A' + 10;}
80a47a2c
TK		 449 *c <<= 4;
450 if (isdigit(qp_p[1])) {*c |= qp_p[1] - '0';}
6ab02e3f 451 else {*c |= toupper(qp_p[1]) - 'A' + 10;}
80a47a2c 452 return qp_p + 2;
6ab02e3f 453 }
80a47a2c
TK		 454
455 /* Illegal char here */
456 *c = PDKIM_QP_ERROR_DECODE;
457 return initial_pos;
458}
459
460
461/* -------------------------------------------------------------------------- */
462char *pdkim_decode_qp(char *str) {
463 int nchar = 0;
464 char *q;
465 char *p = str;
466 char *n = malloc(strlen(p)+1);
467 if (n == NULL) return NULL;
468 *n = '\0';
469 q = n;
470 while (*p != '\0') {
471 if (*p == '=') {
472 p = pdkim_decode_qp_char(p,&nchar);
473 if (nchar >= 0) {
474 *q = nchar;
475 q++;
476 continue;
477 }
478 }
479 else {
480 *q = *p;
481 q++;
482 }
483 p++;
484 }
485 *q = '\0';
486 return n;
487}
488
489
490/* -------------------------------------------------------------------------- */
491char *pdkim_decode_base64(char *str, int *num_decoded) {
492 int dlen = 0;
493 char *res;
494
495 base64_decode(NULL, &dlen, (unsigned char *)str, strlen(str));
496 res = malloc(dlen+1);
497 if (res == NULL) return NULL;
498 if (base64_decode((unsigned char *)res,&dlen,(unsigned char *)str,strlen(str)) != 0) {
499 free(res);
500 return NULL;
501 }
502 if (num_decoded != NULL) *num_decoded = dlen;
503 return res;
504}
505
506/* -------------------------------------------------------------------------- */
507char *pdkim_encode_base64(char *str, int num) {
508 int dlen = 0;
509 char *res;
510
511 base64_encode(NULL, &dlen, (unsigned char *)str, num);
512 res = malloc(dlen+1);
513 if (res == NULL) return NULL;
514 if (base64_encode((unsigned char *)res,&dlen,(unsigned char *)str,num) != 0) {
515 free(res);
516 return NULL;
517 }
518 return res;
519}
520
521
522/* -------------------------------------------------------------------------- */
523#define PDKIM_HDR_LIMBO 0
524#define PDKIM_HDR_TAG 1
525#define PDKIM_HDR_VALUE 2
526pdkim_signature *pdkim_parse_sig_header(pdkim_ctx *ctx, char *raw_hdr) {
527 pdkim_signature *sig ;
528 char *p,*q;
529 pdkim_str *cur_tag = NULL;
530 pdkim_str *cur_val = NULL;
531 int past_hname = 0;
532 int in_b_val = 0;
533 int where = PDKIM_HDR_LIMBO;
534 int i;
535
536 sig = malloc(sizeof(pdkim_signature));
537 if (sig == NULL) return NULL;
538 memset(sig,0,sizeof(pdkim_signature));
539 sig->bodylength = -1;
540
541 sig->rawsig_no_b_val = malloc(strlen(raw_hdr)+1);
542 if (sig->rawsig_no_b_val == NULL) {
543 free(sig);
544 return NULL;
545 }
546
547 p = raw_hdr;
548 q = sig->rawsig_no_b_val;
549
550 while (1) {
551
552 /* Ignore FWS */
553 if ( (*p == '\r') || (*p == '\n') )
554 goto NEXT_CHAR;
555
556 /* Fast-forward through header name */
557 if (!past_hname) {
558 if (*p == ':') past_hname = 1;
559 goto NEXT_CHAR;
560 }
561
562 if (where == PDKIM_HDR_LIMBO) {
563 /* In limbo, just wait for a tag-char to appear */
564 if (!((*p >= 'a') && (*p <= 'z')))
565 goto NEXT_CHAR;
566
567 where = PDKIM_HDR_TAG;
568 }
569
570 if (where == PDKIM_HDR_TAG) {
571 if (cur_tag == NULL)
572 cur_tag = pdkim_strnew(NULL);
573
574 if ((*p >= 'a') && (*p <= 'z'))
575 pdkim_strncat(cur_tag,p,1);
576
577 if (*p == '=') {
578 if (strcmp(cur_tag->str,"b") == 0) {
579 *q = '='; q++;
580 in_b_val = 1;
581 }
582 where = PDKIM_HDR_VALUE;
583 goto NEXT_CHAR;
584 }
585 }
586
587 if (where == PDKIM_HDR_VALUE) {
588 if (cur_val == NULL)
589 cur_val = pdkim_strnew(NULL);
590
591 if ( (*p == '\r') || (*p == '\n') || (*p == ' ') || (*p == '\t') )
592 goto NEXT_CHAR;
593
594 if ( (*p == ';') || (*p == '\0') ) {
595 if (cur_tag->len > 0) {
596 pdkim_strtrim(cur_val);
597 #ifdef PDKIM_DEBUG
598 if (ctx->debug_stream)
599 fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str);
600 #endif
601 switch (cur_tag->str[0]) {
602 case 'b':
603 switch (cur_tag->str[1]) {
604 case 'h':
605 sig->bodyhash = pdkim_decode_base64(cur_val->str,&(sig->bodyhash_len));
606 break;
607 default:
608 sig->sigdata = pdkim_decode_base64(cur_val->str,&(sig->sigdata_len));
609 break;
610 }
611 break;
612 case 'v':
613 if (strcmp(cur_val->str,PDKIM_SIGNATURE_VERSION) == 0) {
614 /* We only support version 1, and that is currently the
615 only version there is. */
616 sig->version = 1;
617 }
618 break;
619 case 'a':
620 i = 0;
621 while (pdkim_algos[i] != NULL) {
622 if (strcmp(cur_val->str,pdkim_algos[i]) == 0 ) {
623 sig->algo = i;
624 break;
625 }
626 i++;
627 }
628 break;
629 case 'c':
630 i = 0;
631 while (pdkim_combined_canons[i].str != NULL) {
632 if (strcmp(cur_val->str,pdkim_combined_canons[i].str) == 0 ) {
633 sig->canon_headers = pdkim_combined_canons[i].canon_headers;
634 sig->canon_body = pdkim_combined_canons[i].canon_body;
635 break;
636 }
637 i++;
638 }
639 break;
640 case 'q':
641 i = 0;
642 while (pdkim_querymethods[i] != NULL) {
643 if (strcmp(cur_val->str,pdkim_querymethods[i]) == 0 ) {
644 sig->querymethod = i;
645 break;
646 }
647 i++;
648 }
649 break;
650 case 's':
651 sig->selector = strdup(cur_val->str);
652 break;
653 case 'd':
654 sig->domain = strdup(cur_val->str);
655 break;
656 case 'i':
657 sig->identity = pdkim_decode_qp(cur_val->str);
658 break;
659 case 't':
660 sig->created = strtoul(cur_val->str,NULL,10);
661 break;
662 case 'x':
663 sig->expires = strtoul(cur_val->str,NULL,10);
664 break;
665 case 'l':
666 sig->bodylength = strtol(cur_val->str,NULL,10);
667 break;
668 case 'h':
669 sig->headernames = strdup(cur_val->str);
670 break;
671 case 'z':
672 sig->copiedheaders = pdkim_decode_qp(cur_val->str);
673 break;
674 default:
675 #ifdef PDKIM_DEBUG
676 if (ctx->debug_stream)
677 fprintf(ctx->debug_stream, "Unknown tag encountered\n");
678 #endif
679 break;
680 }
681 }
682 pdkim_strclear(cur_tag);
683 pdkim_strclear(cur_val);
684 in_b_val = 0;
685 where = PDKIM_HDR_LIMBO;
686 goto NEXT_CHAR;
687 }
688 else pdkim_strncat(cur_val,p,1);
689 }
690
691 NEXT_CHAR:
692 if (*p == '\0') break;
693
694 if (!in_b_val) {
695 *q = *p;
696 q++;
697 }
698 p++;
699 }
700
701 /* Make sure the most important bits are there. */
702 if (!(sig->domain && (*(sig->domain) != '\0') &&
703 sig->selector && (*(sig->selector) != '\0') &&
704 sig->headernames && (*(sig->headernames) != '\0') &&
705 sig->bodyhash &&
706 sig->sigdata &&
707 sig->version)) {
708 pdkim_free_sig(sig);
709 return NULL;
710 }
711
80a47a2c
TK		 712 *q = '\0';
713 /* Chomp raw header. The final newline must not be added to the signature. */
714 q--;
715 while( (q > sig->rawsig_no_b_val) && ((*q == '\r') || (*q == '\n')) ) {
716 *q = '\0'; q--;
717 }
718
719 #ifdef PDKIM_DEBUG
720 if (ctx->debug_stream) {
721 fprintf(ctx->debug_stream,
722 "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
723 pdkim_quoteprint(ctx->debug_stream,
724 sig->rawsig_no_b_val,
725 strlen(sig->rawsig_no_b_val), 1);
726 fprintf(ctx->debug_stream,
727 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
728 }
729 #endif
730
731 sig->sha1_body = malloc(sizeof(sha1_context));
732 if (sig->sha1_body == NULL) {
733 pdkim_free_sig(sig);
734 return NULL;
735 }
736 sig->sha2_body = malloc(sizeof(sha2_context));
737 if (sig->sha2_body == NULL) {
738 pdkim_free_sig(sig);
739 return NULL;
740 }
741
742 sha1_starts(sig->sha1_body);
743 sha2_starts(sig->sha2_body,0);
744
745 return sig;
746}
747
748
749/* -------------------------------------------------------------------------- */
750pdkim_pubkey *pdkim_parse_pubkey_record(pdkim_ctx *ctx, char *raw_record) {
751 pdkim_pubkey *pub ;
752 char *p;
753 pdkim_str *cur_tag = NULL;
754 pdkim_str *cur_val = NULL;
755 int where = PDKIM_HDR_LIMBO;
756
757 pub = malloc(sizeof(pdkim_pubkey));
758 if (pub == NULL) return NULL;
759 memset(pub,0,sizeof(pdkim_pubkey));
760
761 p = raw_record;
762
763 while (1) {
764
765 /* Ignore FWS */
766 if ( (*p == '\r') || (*p == '\n') )
767 goto NEXT_CHAR;
768
769 if (where == PDKIM_HDR_LIMBO) {
770 /* In limbo, just wait for a tag-char to appear */
771 if (!((*p >= 'a') && (*p <= 'z')))
772 goto NEXT_CHAR;
773
774 where = PDKIM_HDR_TAG;
775 }
776
777 if (where == PDKIM_HDR_TAG) {
778 if (cur_tag == NULL)
779 cur_tag = pdkim_strnew(NULL);
780
781 if ((*p >= 'a') && (*p <= 'z'))
782 pdkim_strncat(cur_tag,p,1);
783
784 if (*p == '=') {
785 where = PDKIM_HDR_VALUE;
786 goto NEXT_CHAR;
787 }
788 }
789
790 if (where == PDKIM_HDR_VALUE) {
791 if (cur_val == NULL)
792 cur_val = pdkim_strnew(NULL);
793
794 if ( (*p == '\r') || (*p == '\n') )
795 goto NEXT_CHAR;
796
797 if ( (*p == ';') || (*p == '\0') ) {
798 if (cur_tag->len > 0) {
799 pdkim_strtrim(cur_val);
800 #ifdef PDKIM_DEBUG
801 if (ctx->debug_stream)
802 fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str);
803 #endif
804 switch (cur_tag->str[0]) {
805 case 'v':
806 /* This tag isn't evaluated because:
807 - We only support version DKIM1.
808 - Which is the default for this value (set below)
809 - Other versions are currently not specified. */
810 break;
811 case 'h':
812 pub->hashes = strdup(cur_val->str);
813 break;
814 case 'g':
815 pub->granularity = strdup(cur_val->str);
816 break;
817 case 'n':
818 pub->notes = pdkim_decode_qp(cur_val->str);
819 break;
820 case 'p':
821 pub->key = pdkim_decode_base64(cur_val->str,&(pub->key_len));
822 break;
823 case 'k':
824 pub->hashes = strdup(cur_val->str);
825 break;
826 case 's':
827 pub->srvtype = strdup(cur_val->str);
828 break;
829 case 't':
67932e54 830 if (strchr(cur_val->str,'y') != NULL) pub->testing = 1;
80a47a2c
TK		 831 if (strchr(cur_val->str,'s') != NULL) pub->no_subdomaining = 1;
832 break;
833 default:
834 #ifdef PDKIM_DEBUG
835 if (ctx->debug_stream)
836 fprintf(ctx->debug_stream, "Unknown tag encountered\n");
837 #endif
838 break;
839 }
840 }
841 pdkim_strclear(cur_tag);
842 pdkim_strclear(cur_val);
843 where = PDKIM_HDR_LIMBO;
844 goto NEXT_CHAR;
845 }
846 else pdkim_strncat(cur_val,p,1);
847 }
848
849 NEXT_CHAR:
850 if (*p == '\0') break;
851 p++;
852 }
853
854 /* Set fallback defaults */
855 if (pub->version == NULL) pub->version = strdup(PDKIM_PUB_RECORD_VERSION);
856 if (pub->granularity == NULL) pub->granularity = strdup("*");
857 if (pub->keytype == NULL) pub->keytype = strdup("rsa");
858 if (pub->srvtype == NULL) pub->srvtype = strdup("*");
859
860 /* p= is required */
861 if (pub->key == NULL) {
862 pdkim_free_pubkey(pub);
863 return NULL;
864 }
865
866 return pub;
867}
868
869
870/* -------------------------------------------------------------------------- */
1ba28e2b 871int pdkim_update_bodyhash(pdkim_ctx *ctx, const char *data, int len) {
80a47a2c
TK		 872 pdkim_signature *sig = ctx->sig;
873 /* Cache relaxed version of data */
874 char *relaxed_data = NULL;
875 int relaxed_len = 0;
876
877 /* Traverse all signatures, updating their hashes. */
878 while (sig != NULL) {
879 /* Defaults to simple canon (no further treatment necessary) */
1ba28e2b
PP		 880 const char *canon_data = data;
881 int canon_len = len;
80a47a2c
TK		 882
883 if (sig->canon_body == PDKIM_CANON_RELAXED) {
884 /* Relax the line if not done already */
885 if (relaxed_data == NULL) {
886 int seen_wsp = 0;
1ba28e2b 887 const char *p = data;
80a47a2c
TK		 888 int q = 0;
889 relaxed_data = malloc(len+1);
890 if (relaxed_data == NULL) return PDKIM_ERR_OOM;
891 while (*p != '\0') {
892 char c = *p;
c2b89b98
TK		 893 if (c == '\r') {
894 if ( (q > 0) && (relaxed_data[q-1] == ' ') ) q--;
895 }
896 else if ( (c == '\t') || (c == ' ') ) {
80a47a2c
TK		 897 c = ' '; /* Turns WSP into SP */
898 if (seen_wsp) {
899 p++;
900 continue;
901 }
902 else seen_wsp = 1;
903 }
904 else seen_wsp = 0;
905 relaxed_data[q++] = c;
906 p++;
907 }
908 relaxed_data[q] = '\0';
909 relaxed_len = q;
910 }
911 canon_data = relaxed_data;
912 canon_len = relaxed_len;
913 }
914
915 /* Make sure we don't exceed the to-be-signed body length */
916 if ((sig->bodylength >= 0) &&
917 ((sig->signed_body_bytes+(unsigned long)canon_len) > sig->bodylength))
918 canon_len = (sig->bodylength - sig->signed_body_bytes);
919
920 if (canon_len > 0) {
921 if (sig->algo == PDKIM_ALGO_RSA_SHA1)
922 sha1_update(sig->sha1_body,(unsigned char *)canon_data,canon_len);
923 else
924 sha2_update(sig->sha2_body,(unsigned char *)canon_data,canon_len);
925 sig->signed_body_bytes += canon_len;
926#ifdef PDKIM_DEBUG
927 if (ctx->debug_stream!=NULL)
928 pdkim_quoteprint(ctx->debug_stream,canon_data,canon_len,0);
929#endif
930 }
931
932 sig = sig->next;
933 }
934
935 if (relaxed_data != NULL) free(relaxed_data);
936 return PDKIM_OK;
6ab02e3f 937}
80a47a2c
TK		 938
939
940/* -------------------------------------------------------------------------- */
941int pdkim_finish_bodyhash(pdkim_ctx *ctx) {
942 pdkim_signature *sig = ctx->sig;
943
944 /* Traverse all signatures */
945 while (sig != NULL) {
946
947 /* Finish hashes */
948 unsigned char bh[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */
949 if (sig->algo == PDKIM_ALGO_RSA_SHA1)
950 sha1_finish(sig->sha1_body,bh);
951 else
952 sha2_finish(sig->sha2_body,bh);
953
954 #ifdef PDKIM_DEBUG
955 if (ctx->debug_stream) {
956 fprintf(ctx->debug_stream, "PDKIM [%s] Body bytes hashed: %lu\n",
957 sig->domain, sig->signed_body_bytes);
958 fprintf(ctx->debug_stream, "PDKIM [%s] bh computed: ", sig->domain);
959 pdkim_hexprint(ctx->debug_stream, (char *)bh,
960 (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1);
961 }
962 #endif
963
964 /* SIGNING -------------------------------------------------------------- */
965 if (ctx->mode == PDKIM_MODE_SIGN) {
966 sig->bodyhash_len = (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32;
967 sig->bodyhash = malloc(sig->bodyhash_len);
968 if (sig->bodyhash == NULL) return PDKIM_ERR_OOM;
969 memcpy(sig->bodyhash,bh,sig->bodyhash_len);
970
971 /* If bodylength limit is set, and we have received less bytes
972 than the requested amount, effectively remove the limit tag. */
973 if (sig->signed_body_bytes < sig->bodylength) sig->bodylength = -1;
974 }
975 /* VERIFICATION --------------------------------------------------------- */
976 else {
977 /* Compare bodyhash */
978 if (memcmp(bh,sig->bodyhash,
979 (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32) == 0) {
980 #ifdef PDKIM_DEBUG
981 if (ctx->debug_stream)
982 fprintf(ctx->debug_stream, "PDKIM [%s] Body hash verified OK\n",
983 sig->domain);
984 #endif
985 }
986 else {
987 #ifdef PDKIM_DEBUG
988 if (ctx->debug_stream) {
989 fprintf(ctx->debug_stream, "PDKIM [%s] Body hash did NOT verify\n",
990 sig->domain);
991 fprintf(ctx->debug_stream, "PDKIM [%s] bh signature: ", sig->domain);
992 pdkim_hexprint(ctx->debug_stream, sig->bodyhash,
993 (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1);
994 }
995 #endif
996 sig->verify_status = PDKIM_VERIFY_FAIL;
997 sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY;
998 }
999 }
1000
1001 sig = sig->next;
1002 }
1003
1004 return PDKIM_OK;
6ab02e3f 1005}
80a47a2c
TK		 1006
1007
1008
1009/* -------------------------------------------------------------------------- */
1010/* Callback from pdkim_feed below for processing complete body lines */
1011int pdkim_bodyline_complete(pdkim_ctx *ctx) {
1012 char *p = ctx->linebuf;
1013 int n = ctx->linebuf_offset;
1014
1015 /* Ignore extra data if we've seen the end-of-data marker */
1016 if (ctx->seen_eod) goto BAIL;
1017
1018 /* We've always got one extra byte to stuff a zero ... */
1019 ctx->linebuf[(ctx->linebuf_offset)] = '\0';
1020
1021 if (ctx->input_mode == PDKIM_INPUT_SMTP) {
1022 /* Terminate on EOD marker */
1023 if (memcmp(p,".\r\n",3) == 0) {
1024 ctx->seen_eod = 1;
1025 goto BAIL;
1026 }
1027 /* Unstuff dots */
1028 if (memcmp(p,"..",2) == 0) {
1029 p++;
1030 n--;
1031 }
1032 }
1033
1034 /* Empty lines need to be buffered until we find a non-empty line */
1035 if (memcmp(p,"\r\n",2) == 0) {
1036 ctx->num_buffered_crlf++;
1037 goto BAIL;
1038 }
1039
1040 /* At this point, we have a non-empty line, so release the buffered ones. */
1041 while (ctx->num_buffered_crlf) {
1042 pdkim_update_bodyhash(ctx,"\r\n",2);
1043 ctx->num_buffered_crlf--;
1044 }
1045
1046 pdkim_update_bodyhash(ctx,p,n);
1047
1048 BAIL:
1049 ctx->linebuf_offset = 0;
1050 return PDKIM_OK;
1051}
1052
1053
1054/* -------------------------------------------------------------------------- */
1055/* Callback from pdkim_feed below for processing complete headers */
1056#define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:"
1057int pdkim_header_complete(pdkim_ctx *ctx) {
1058 pdkim_signature *sig = ctx->sig;
1059
1060 /* Special case: The last header can have an extra \r appended */
1061 if ( (ctx->cur_header->len > 1) &&
1062 (ctx->cur_header->str[(ctx->cur_header->len)-1] == '\r') ) {
1063 ctx->cur_header->str[(ctx->cur_header->len)-1] = '\0';
1064 ctx->cur_header->len--;
1065 }
1066
1067 ctx->num_headers++;
1068 if (ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL;
1069
37f8b554
TK		 1070 /* SIGNING -------------------------------------------------------------- */
1071 if (ctx->mode == PDKIM_MODE_SIGN) {
1072 /* Traverse all signatures */
1073 while (sig != NULL) {
1074 pdkim_stringlist *list;
80a47a2c 1075
80a47a2c
TK		 1076 if (header_name_match(ctx->cur_header->str,
1077 sig->sign_headers?
1078 sig->sign_headers:
1079 PDKIM_DEFAULT_SIGN_HEADERS, 0) != PDKIM_OK) goto NEXT_SIG;
80a47a2c 1080
37f8b554
TK		 1081 /* Add header to the signed headers list (in reverse order) */
1082 list = pdkim_prepend_stringlist(sig->headers,
1083 ctx->cur_header->str);
1084 if (list == NULL) return PDKIM_ERR_OOM;
1085 sig->headers = list;
1086
1087 NEXT_SIG:
1088 sig = sig->next;
1089 }
80a47a2c
TK		 1090 }
1091
1092 /* DKIM-Signature: headers are added to the verification list */
37f8b554
TK		 1093 if (ctx->mode == PDKIM_MODE_VERIFY) {
1094 if (strncasecmp(ctx->cur_header->str,
80a47a2c 1095 DKIM_SIGNATURE_HEADERNAME,
37f8b554
TK		 1096 strlen(DKIM_SIGNATURE_HEADERNAME)) == 0) {
1097 pdkim_signature *new_sig;
1098 /* Create and chain new signature block */
1099 #ifdef PDKIM_DEBUG
1100 if (ctx->debug_stream)
1101 fprintf(ctx->debug_stream,
1102 "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1103 #endif
1104 new_sig = pdkim_parse_sig_header(ctx, ctx->cur_header->str);
1105 if (new_sig != NULL) {
1106 pdkim_signature *last_sig = ctx->sig;
1107 if (last_sig == NULL) {
1108 ctx->sig = new_sig;
1109 }
1110 else {
1111 while (last_sig->next != NULL) { last_sig = last_sig->next; }
1112 last_sig->next = new_sig;
1113 }
80a47a2c
TK		 1114 }
1115 else {
37f8b554
TK		 1116 #ifdef PDKIM_DEBUG
1117 if (ctx->debug_stream) {
1118 fprintf(ctx->debug_stream,"Error while parsing signature header\n");
1119 fprintf(ctx->debug_stream,
1120 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1121 }
1122 #endif
80a47a2c
TK		 1123 }
1124 }
37f8b554 1125 /* every other header is stored for signature verification */
80a47a2c 1126 else {
37f8b554
TK		 1127 pdkim_stringlist *list;
1128
1129 list = pdkim_prepend_stringlist(ctx->headers,
1130 ctx->cur_header->str);
1131 if (list == NULL) return PDKIM_ERR_OOM;
1132 ctx->headers = list;
80a47a2c
TK		 1133 }
1134 }
1135
1136 BAIL:
1137 pdkim_strclear(ctx->cur_header); /* Re-use existing pdkim_str */
1138 return PDKIM_OK;
6ab02e3f 1139}
80a47a2c
TK		 1140
1141
1142
1143/* -------------------------------------------------------------------------- */
1144#define HEADER_BUFFER_FRAG_SIZE 256
1145DLLEXPORT int pdkim_feed (pdkim_ctx *ctx,
1146 char *data,
1147 int len) {
1148 int p;
1149 for (p=0;p<len;p++) {
1150 char c = data[p];
1151 if (ctx->past_headers) {
1152 /* Processing body byte */
1153 ctx->linebuf[(ctx->linebuf_offset)++] = c;
1154 if (c == '\n') {
1155 int rc = pdkim_bodyline_complete(ctx); /* End of line */
1156 if (rc != PDKIM_OK) return rc;
1157 }
1158 if (ctx->linebuf_offset == (PDKIM_MAX_BODY_LINE_LEN-1))
1159 return PDKIM_ERR_LONG_LINE;
1160 }
1161 else {
1162 /* Processing header byte */
1163 if (c != '\r') {
1164 if (c == '\n') {
1165 if (ctx->seen_lf) {
1166 int rc = pdkim_header_complete(ctx); /* Seen last header line */
1167 if (rc != PDKIM_OK) return rc;
1168 ctx->past_headers = 1;
1169 ctx->seen_lf = 0;
1170#ifdef PDKIM_DEBUG
1171 if (ctx->debug_stream)
1172 fprintf(ctx->debug_stream,
1173 "PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1174#endif
1175 continue;
1176 }
1177 else ctx->seen_lf = 1;
1178 }
1179 else if (ctx->seen_lf) {
1180 if (! ((c == '\t') || (c == ' '))) {
1181 int rc = pdkim_header_complete(ctx); /* End of header */
1182 if (rc != PDKIM_OK) return rc;
1183 }
1184 ctx->seen_lf = 0;
1185 }
1186 }
1187 if (ctx->cur_header == NULL) {
1188 ctx->cur_header = pdkim_strnew(NULL);
1189 if (ctx->cur_header == NULL) return PDKIM_ERR_OOM;
1190 }
1191 if (ctx->cur_header->len < PDKIM_MAX_HEADER_LEN)
1192 if (pdkim_strncat(ctx->cur_header,&data[p],1) == NULL)
1193 return PDKIM_ERR_OOM;
1194 }
1195 }
1196 return PDKIM_OK;
6ab02e3f 1197}
80a47a2c 1198
05b7d6de
JB		 1199/*
1200 * RFC 5322 specifies that header line length SHOULD be no more than 78
1201 * lets make it so!
1202 * pdkim_headcat
1203 * returns char*
1204 *
1205 * col: this int holds and receives column number (octets since last '\n')
1206 * str: partial string to append to
1207 * pad: padding, split line or space after before or after eg: ";"
1208 * intro: - must join to payload eg "h=", usually the tag name
1209 * payload: eg base64 data - long data can be split arbitrarily.
1210 *
1211 * this code doesn't fold the header in some of the places that RFC4871
1212 * allows: As per RFC5322(2.2.3) it only folds before or after tag-value
1213 * pairs and inside long values. it also always spaces or breaks after the
1214 * "pad"
1215 *
1216 * no guarantees are made for output given out-of range input. like tag
1217 * names loinger than 78, or bogus col. Input is assumed to be free of line breaks.
1218 */
1219
1220static char *pdkim_headcat(int *col, pdkim_str *str, const char*pad,const char *intro, const char *payload ) {
1221 size_t l;
1222 if( pad)
1223 {
1224 l = strlen(pad);
1225 if( *col + l > 78 )
1226 {
1227 pdkim_strcat(str, "\r\n\t");
1228 *col=1;
1229 }
1230 pdkim_strncat(str, pad,l);
1231 *col +=l;
1232 }
1233
1234 l=(pad?1:0) + (intro?strlen(intro):0 );
1235
1236 if( *col + l > 78 )
1237 { /*can't fit intro - start a new line to make room.*/
1238 pdkim_strcat(str, "\r\n\t");
1239 *col=1;
1240 l= intro?strlen(intro):0;
1241 }
1242
1243 l += payload ? strlen(payload):0 ;
1244
1245 while(l>77)
1246 { /* this fragment will not fit on a single line */
1247 if( pad )
1248 {
1249 pdkim_strcat(str, " ");
1250 *col +=1;
1251 pad=NULL; // only want this once
1252 l--;
1253 }
1254 if( intro )
1255 {
1256 size_t sl=strlen(intro);
1257 pdkim_strncat(str, intro,sl);
1258 *col +=sl;
1259 l-=sl;
1260 intro=NULL; // only want this once
1261 }
1262 if(payload)
1263 {
1264 size_t sl=strlen(payload);
1265 size_t chomp = *col+sl < 77 ? sl : 78-*col;
1266 pdkim_strncat(str, payload,chomp);
1267 *col +=chomp;
1268 payload+=chomp;
1269 l-=chomp-1;
1270 }
1271 // the while precondition tells us it didn't fit.
1272 pdkim_strcat(str, "\r\n\t");
1273 *col=1;
1274 }
1275 if( *col + l > 78 )
1276 {
1277 pdkim_strcat(str, "\r\n\t");
1278 *col=1;
1279 pad=NULL;
1280 }
1281
1282 if( pad )
1283 {
1284 pdkim_strcat(str, " ");
1285 *col +=1;
1286 pad=NULL;
1287 }
1288
1289 if( intro )
1290 {
1291 size_t sl=strlen(intro);
1292 pdkim_strncat(str, intro,sl);
1293 *col +=sl;
1294 l-=sl;
1295 intro=NULL;
1296 }
1297 if(payload)
1298 {
1299 size_t sl=strlen(payload);
1300 pdkim_strncat(str, payload,sl);
1301 *col +=sl;
1302 }
1303
1304 return str->str;
1305}
80a47a2c
TK		 1306
1307/* -------------------------------------------------------------------------- */
1308char *pdkim_create_header(pdkim_signature *sig, int final) {
1309 char *rc = NULL;
1310 char *base64_bh = NULL;
1311 char *base64_b = NULL;
05b7d6de 1312 int col=0;
80a47a2c
TK		 1313 pdkim_str *hdr = pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION);
1314 if (hdr == NULL) return NULL;
05b7d6de
JB		 1315 pdkim_str *canon_all = pdkim_strnew(pdkim_canons[sig->canon_headers]);
1316 if (canon_all == NULL) goto BAIL;
80a47a2c
TK		 1317
1318 base64_bh = pdkim_encode_base64(sig->bodyhash, sig->bodyhash_len);
1319 if (base64_bh == NULL) goto BAIL;
1320
05b7d6de
JB		 1321 col=strlen(hdr->str);
1322
80a47a2c
TK		 1323 /* Required and static bits */
1324 if (
05b7d6de
JB		 1325 pdkim_headcat(&col,hdr,";","a=",pdkim_algos[sig->algo]) &&
1326 pdkim_headcat(&col,hdr,";","q=",pdkim_querymethods[sig->querymethod]) &&
1327 pdkim_strcat(canon_all,"/") &&
1328 pdkim_strcat(canon_all,pdkim_canons[sig->canon_body]) &&
1329 pdkim_headcat(&col,hdr,";","c=",canon_all->str) &&
1330 pdkim_headcat(&col,hdr,";","d=",sig->domain) &&
1331 pdkim_headcat(&col,hdr,";","s=",sig->selector)
80a47a2c 1332 ) {
05b7d6de
JB		 1333 /* list of eader names can be split between items. */
1334 {
1335 char *n=strdup(sig->headernames);
1336 char *f=n;
1337 char *i="h=";
1338 char *s=";";
1339 if(!n) goto BAIL;
1340 while (*n)
1341 {
1342 char *c=strchr(n,':');
1343 if(c) *c='\0';
1344 if(!i)
1345 {
1346 if (!pdkim_headcat(&col,hdr,NULL,NULL,":"))
1347 {
1348 free(f);
1349 goto BAIL;
1350 }
1351 }
1352 if( !pdkim_headcat(&col,hdr,s,i,n))
1353 {
1354 free(f);
1355 goto BAIL;
1356 }
1357 if(c) n=c+1 ; else break;
1358 s=NULL;
1359 i=NULL;
1360 }
1361 free(f);
1362 }
1363 if(!pdkim_headcat(&col,hdr,";","bh=",base64_bh))
1364 goto BAIL;
1365
80a47a2c
TK		 1366 /* Optional bits */
1367 if (sig->identity != NULL) {
05b7d6de 1368 if(!pdkim_headcat(&col,hdr,";","i=",sig->identity)){
80a47a2c
TK		 1369 goto BAIL;
1370 }
1371 }
05b7d6de 1372
80a47a2c 1373 if (sig->created > 0) {
05b7d6de
JB		 1374 char minibuf[20];
1375 snprintf(minibuf,20,"%lu",sig->created);
1376 if(!pdkim_headcat(&col,hdr,";","t=",minibuf)) {
80a47a2c
TK		 1377 goto BAIL;
1378 }
1379 }
1380 if (sig->expires > 0) {
05b7d6de
JB		 1381 char minibuf[20];
1382 snprintf(minibuf,20,"%lu",sig->expires);
1383 if(!pdkim_headcat(&col,hdr,";","x=",minibuf)) {
80a47a2c
TK		 1384 goto BAIL;
1385 }
1386 }
1387 if (sig->bodylength >= 0) {
05b7d6de
JB		 1388 char minibuf[20];
1389 snprintf(minibuf,20,"%lu",sig->bodylength);
1390 if(!pdkim_headcat(&col,hdr,";","l=",minibuf)) {
80a47a2c
TK		 1391 goto BAIL;
1392 }
1393 }
05b7d6de 1394
80a47a2c
TK		 1395 /* Preliminary or final version? */
1396 if (final) {
1397 base64_b = pdkim_encode_base64(sig->sigdata, sig->sigdata_len);
1398 if (base64_b == NULL) goto BAIL;
05b7d6de 1399 if(!pdkim_headcat(&col,hdr,";","b=",base64_b)) goto BAIL;
80a47a2c
TK		 1400 }
1401 else {
05b7d6de 1402 if(!pdkim_headcat(&col,hdr,";","b=","")) goto BAIL;
80a47a2c
TK		 1403 }
1404
05b7d6de
JB		 1405 /* add trailing semicolon: I'm not sure if this is actually needed */
1406 if(!pdkim_headcat(&col,hdr,NULL,";","")) goto BAIL;
1407
1408 goto DONE;
80a47a2c
TK		 1409 }
1410
1411 DONE:
1412 rc = strdup(hdr->str);
1413
1414 BAIL:
1415 pdkim_strfree(hdr);
05b7d6de 1416 if (canon_all != NULL) pdkim_strfree(canon_all);
80a47a2c
TK		 1417 if (base64_bh != NULL) free(base64_bh);
1418 if (base64_b != NULL) free(base64_b);
1419 return rc;
1420}
1421
1422
1423/* -------------------------------------------------------------------------- */
1424DLLEXPORT int pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatures) {
1425 pdkim_signature *sig = ctx->sig;
1426 pdkim_str *headernames = NULL; /* Collected signed header names */
1427
1428 /* Check if we must still flush a (partial) header. If that is the
1429 case, the message has no body, and we must compute a body hash
1430 out of '<CR><LF>' */
90204638 1431 if (ctx->cur_header && ctx->cur_header->len) {
80a47a2c
TK		 1432 int rc = pdkim_header_complete(ctx);
1433 if (rc != PDKIM_OK) return rc;
1434 pdkim_update_bodyhash(ctx,"\r\n",2);
1435 }
1436 else {
1437 /* For non-smtp input, check if there's an unfinished line in the
1438 body line buffer. If that is the case, we must add a CRLF to the
1439 hash to properly terminate the message. */
1440 if ((ctx->input_mode == PDKIM_INPUT_NORMAL) && ctx->linebuf_offset) {
1441 pdkim_update_bodyhash(ctx, ctx->linebuf, ctx->linebuf_offset);
1442 pdkim_update_bodyhash(ctx,"\r\n",2);
1443 }
1444 #ifdef PDKIM_DEBUG
1445 if (ctx->debug_stream)
1446 fprintf(ctx->debug_stream,
8fd6966b 1447 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
80a47a2c
TK		 1448 #endif
1449 }
1450
1451 /* Build (and/or evaluate) body hash */
1452 if (pdkim_finish_bodyhash(ctx) != PDKIM_OK) return PDKIM_ERR_OOM;
1453
1454 /* SIGNING -------------------------------------------------------------- */
1455 if (ctx->mode == PDKIM_MODE_SIGN) {
1456 headernames = pdkim_strnew(NULL);
1457 if (headernames == NULL) return PDKIM_ERR_OOM;
1458 }
1459 /* ---------------------------------------------------------------------- */
1460
1461 while (sig != NULL) {
1462 sha1_context sha1_headers;
1463 sha2_context sha2_headers;
1464 char *sig_hdr;
1465 char headerhash[32];
1466
1467 if (sig->algo == PDKIM_ALGO_RSA_SHA1)
1468 sha1_starts(&sha1_headers);
1469 else
1470 sha2_starts(&sha2_headers,0);
1471
1472 #ifdef PDKIM_DEBUG
1473 if (ctx->debug_stream)
1474 fprintf(ctx->debug_stream,
1475 "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n");
1476 #endif
1477
1478 /* SIGNING ---------------------------------------------------------------- */
1479 /* When signing, walk through our header list and add them to the hash. As we
1480 go, construct a list of the header's names to use for the h= parameter. */
1481 if (ctx->mode == PDKIM_MODE_SIGN) {
1482 pdkim_stringlist *p = sig->headers;
1483 while (p != NULL) {
1484 char *rh = NULL;
1485 /* Collect header names (Note: colon presence is guaranteed here) */
1486 char *q = strchr(p->value,':');
1487 if (pdkim_strncat(headernames, p->value,
1488 (q-(p->value))+((p->next==NULL)?0:1)) == NULL)
1489 return PDKIM_ERR_OOM;
1490
1491 if (sig->canon_headers == PDKIM_CANON_RELAXED)
1492 rh = pdkim_relax_header(p->value,1); /* cook header for relaxed canon */
1493 else
1494 rh = strdup(p->value); /* just copy it for simple canon */
1495
1496 if (rh == NULL) return PDKIM_ERR_OOM;
1497
1498 /* Feed header to the hash algorithm */
1499 if (sig->algo == PDKIM_ALGO_RSA_SHA1)
1500 sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh));
1501 else
1502 sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh));
1503 #ifdef PDKIM_DEBUG
1504 if (ctx->debug_stream)
1505 pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1);
1506 #endif
1507 free(rh);
1508 p = p->next;
1509 }
1510 }
1511 /* VERIFICATION ----------------------------------------------------------- */
1512 /* When verifying, walk through the header name list in the h= parameter and
1513 add the headers to the hash in that order. */
1514 else {
1515 char *b = strdup(sig->headernames);
1516 char *p = b;
1517 char *q = NULL;
a3c1395f
NM		 1518 pdkim_stringlist *hdrs = ctx->headers;
1519
80a47a2c
TK		 1520 if (b == NULL) return PDKIM_ERR_OOM;
1521
37f8b554 1522 /* clear tags */
37f8b554
TK		 1523 while (hdrs != NULL) {
1524 hdrs->tag = 0;
1525 hdrs = hdrs->next;
1526 }
1527
80a47a2c 1528 while(1) {
37f8b554 1529 hdrs = ctx->headers;
80a47a2c
TK		 1530 q = strchr(p,':');
1531 if (q != NULL) *q = '\0';
1532 while (hdrs != NULL) {
37f8b554
TK		 1533 if ( (hdrs->tag == 0) &&
1534 (strncasecmp(hdrs->value,p,strlen(p)) == 0) &&
97713345 1535 ((hdrs->value)[strlen(p)] == ':') ) {
80a47a2c
TK		 1536 char *rh = NULL;
1537 if (sig->canon_headers == PDKIM_CANON_RELAXED)
1538 rh = pdkim_relax_header(hdrs->value,1); /* cook header for relaxed canon */
1539 else
1540 rh = strdup(hdrs->value); /* just copy it for simple canon */
1541 if (rh == NULL) return PDKIM_ERR_OOM;
1542 /* Feed header to the hash algorithm */
1543 if (sig->algo == PDKIM_ALGO_RSA_SHA1)
1544 sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh));
1545 else
1546 sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh));
1547 #ifdef PDKIM_DEBUG
1548 if (ctx->debug_stream)
1549 pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1);
1550 #endif
1551 free(rh);
37f8b554 1552 hdrs->tag = 1;
97713345 1553 break;
80a47a2c
TK		 1554 }
1555 hdrs = hdrs->next;
1556 }
1557 if (q == NULL) break;
1558 p = q+1;
1559 }
1560 free(b);
1561 }
1562
1563 #ifdef PDKIM_DEBUG
1564 if (ctx->debug_stream)
1565 fprintf(ctx->debug_stream,
1566 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1567 #endif
1568
1569 /* SIGNING ---------------------------------------------------------------- */
1570 if (ctx->mode == PDKIM_MODE_SIGN) {
1571 /* Copy headernames to signature struct */
1572 sig->headernames = strdup(headernames->str);
1573 pdkim_strfree(headernames);
1574
1575 /* Create signature header with b= omitted */
1576 sig_hdr = pdkim_create_header(ctx->sig,0);
1577 }
1578 /* VERIFICATION ----------------------------------------------------------- */
1579 else {
1580 sig_hdr = strdup(sig->rawsig_no_b_val);
1581 }
1582 /* ------------------------------------------------------------------------ */
1583
1584 if (sig_hdr == NULL) return PDKIM_ERR_OOM;
1585
1586 /* Relax header if necessary */
1587 if (sig->canon_headers == PDKIM_CANON_RELAXED) {
1588 char *relaxed_hdr = pdkim_relax_header(sig_hdr,0);
1589 free(sig_hdr);
1590 if (relaxed_hdr == NULL) return PDKIM_ERR_OOM;
1591 sig_hdr = relaxed_hdr;
1592 }
1593
1594 #ifdef PDKIM_DEBUG
1595 if (ctx->debug_stream) {
1596 fprintf(ctx->debug_stream,
1597 "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n");
1598 pdkim_quoteprint(ctx->debug_stream, sig_hdr, strlen(sig_hdr), 1);
1599 fprintf(ctx->debug_stream,
1600 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1601 }
1602 #endif
1603
1604 /* Finalize header hash */
1605 if (sig->algo == PDKIM_ALGO_RSA_SHA1) {
1606 sha1_update(&(sha1_headers),(unsigned char *)sig_hdr,strlen(sig_hdr));
1607 sha1_finish(&(sha1_headers),(unsigned char *)headerhash);
1608 #ifdef PDKIM_DEBUG
1609 if (ctx->debug_stream) {
1610 fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain);
1611 pdkim_hexprint(ctx->debug_stream, headerhash, 20, 1);
1612 }
1613 #endif
1614 }
1615 else {
1616 sha2_update(&(sha2_headers),(unsigned char *)sig_hdr,strlen(sig_hdr));
1617 sha2_finish(&(sha2_headers),(unsigned char *)headerhash);
1618 #ifdef PDKIM_DEBUG
1619 if (ctx->debug_stream) {
1620 fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain);
1621 pdkim_hexprint(ctx->debug_stream, headerhash, 32, 1);
1622 }
1623 #endif
1624 }
1625
1626 free(sig_hdr);
1627
1628 /* SIGNING ---------------------------------------------------------------- */
1629 if (ctx->mode == PDKIM_MODE_SIGN) {
1630 rsa_context rsa;
1631
62d3e98d 1632 rsa_init(&rsa,RSA_PKCS_V15,0);
80a47a2c
TK		 1633
1634 /* Perform private key operation */
1635 if (rsa_parse_key(&rsa, (unsigned char *)sig->rsa_privkey,
1636 strlen(sig->rsa_privkey), NULL, 0) != 0) {
1637 return PDKIM_ERR_RSA_PRIVKEY;
1638 }
1639
1640 sig->sigdata_len = mpi_size(&(rsa.N));
1641 sig->sigdata = malloc(sig->sigdata_len);
1642 if (sig->sigdata == NULL) return PDKIM_ERR_OOM;
1643
1644 if (rsa_pkcs1_sign( &rsa, RSA_PRIVATE,
1645 ((sig->algo == PDKIM_ALGO_RSA_SHA1)?
67932e54 1646 SIG_RSA_SHA1:SIG_RSA_SHA256),
80a47a2c
TK		 1647 0,
1648 (unsigned char *)headerhash,
1649 (unsigned char *)sig->sigdata ) != 0) {
1650 return PDKIM_ERR_RSA_SIGNING;
1651 }
1652
1653 rsa_free(&rsa);
1654
1655 #ifdef PDKIM_DEBUG
1656 if (ctx->debug_stream) {
1657 fprintf(ctx->debug_stream, "PDKIM [%s] b computed: ",
1658 sig->domain);
1659 pdkim_hexprint(ctx->debug_stream, sig->sigdata, sig->sigdata_len, 1);
1660 }
1661 #endif
1662
1663 sig->signature_header = pdkim_create_header(ctx->sig,1);
1664 if (sig->signature_header == NULL) return PDKIM_ERR_OOM;
1665 }
1666 /* VERIFICATION ----------------------------------------------------------- */
1667 else {
1668 rsa_context rsa;
1669 char *dns_txt_name, *dns_txt_reply;
1670
62d3e98d 1671 rsa_init(&rsa,RSA_PKCS_V15,0);
80a47a2c
TK		 1672
1673 dns_txt_name = malloc(PDKIM_DNS_TXT_MAX_NAMELEN);
1674 if (dns_txt_name == NULL) return PDKIM_ERR_OOM;
1675 dns_txt_reply = malloc(PDKIM_DNS_TXT_MAX_RECLEN);
1676 if (dns_txt_reply == NULL) {
1677 free(dns_txt_name);
1678 return PDKIM_ERR_OOM;
1679 }
1680 memset(dns_txt_reply,0,PDKIM_DNS_TXT_MAX_RECLEN);
1681 memset(dns_txt_name ,0,PDKIM_DNS_TXT_MAX_NAMELEN);
1682
1683 if (snprintf(dns_txt_name,PDKIM_DNS_TXT_MAX_NAMELEN,
1684 "%s._domainkey.%s.",
1685 sig->selector,sig->domain) >= PDKIM_DNS_TXT_MAX_NAMELEN) {
1686 sig->verify_status = PDKIM_VERIFY_INVALID;
1687 sig->verify_ext_status = PDKIM_VERIFY_INVALID_BUFFER_SIZE;
1688 goto NEXT_VERIFY;
6ab02e3f 1689 }
80a47a2c
TK		 1690
1691 if ((ctx->dns_txt_callback(dns_txt_name, dns_txt_reply) != PDKIM_OK) ||
1692 (dns_txt_reply[0] == '\0')) {
1693 sig->verify_status = PDKIM_VERIFY_INVALID;
1694 sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE;
1695 goto NEXT_VERIFY;
1696 }
1697
1698 #ifdef PDKIM_DEBUG
1699 if (ctx->debug_stream) {
1700 fprintf(ctx->debug_stream,
1701 "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1702 fprintf(ctx->debug_stream,"Raw record: ");
1703 pdkim_quoteprint(ctx->debug_stream, dns_txt_reply, strlen(dns_txt_reply), 1);
1704 }
1705 #endif
1706
1707 sig->pubkey = pdkim_parse_pubkey_record(ctx,dns_txt_reply);
1708 if (sig->pubkey == NULL) {
1709 sig->verify_status = PDKIM_VERIFY_INVALID;
1710 sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING;
1711 #ifdef PDKIM_DEBUG
1712 if (ctx->debug_stream) {
1713 fprintf(ctx->debug_stream,"Error while parsing public key record\n");
1714 fprintf(ctx->debug_stream,
1715 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1716 }
1717 #endif
1718 goto NEXT_VERIFY;
1719 }
1720
1721 #ifdef PDKIM_DEBUG
1722 if (ctx->debug_stream) {
1723 fprintf(ctx->debug_stream,
1724 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1725 }
1726 #endif
1727
1728 if (rsa_parse_public_key(&rsa,
1729 (unsigned char *)sig->pubkey->key,
1730 sig->pubkey->key_len) != 0) {
1731 sig->verify_status = PDKIM_VERIFY_INVALID;
1732 sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING;
1733 goto NEXT_VERIFY;
1734 }
1735
1736 /* Check the signature */
1737 if (rsa_pkcs1_verify(&rsa,
1738 RSA_PUBLIC,
1739 ((sig->algo == PDKIM_ALGO_RSA_SHA1)?
67932e54 1740 SIG_RSA_SHA1:SIG_RSA_SHA256),
80a47a2c
TK		 1741 0,
1742 (unsigned char *)headerhash,
1743 (unsigned char *)sig->sigdata) != 0) {
1744 sig->verify_status = PDKIM_VERIFY_FAIL;
1745 sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE;
80a47a2c
TK		 1746 goto NEXT_VERIFY;
1747 }
1748
ff7ddfd7
TK		 1749 /* We have a winner! (if bodydhash was correct earlier) */
1750 if (sig->verify_status == PDKIM_VERIFY_NONE) {
1751 sig->verify_status = PDKIM_VERIFY_PASS;
1752 }
1753
1754 NEXT_VERIFY:
80a47a2c
TK		 1755
1756 #ifdef PDKIM_DEBUG
1757 if (ctx->debug_stream) {
ff7ddfd7
TK		 1758 fprintf(ctx->debug_stream, "PDKIM [%s] signature status: %s",
1759 sig->domain, pdkim_verify_status_str(sig->verify_status));
1760 if (sig->verify_ext_status > 0) {
1761 fprintf(ctx->debug_stream, " (%s)\n",
1762 pdkim_verify_ext_status_str(sig->verify_ext_status));
1763 }
1764 else {
1765 fprintf(ctx->debug_stream, "\n");
1766 }
80a47a2c
TK		 1767 }
1768 #endif
1769
80a47a2c
TK		 1770 rsa_free(&rsa);
1771 free(dns_txt_name);
1772 free(dns_txt_reply);
1773 }
1774
1775 sig = sig->next;
1776 }
1777
1778 /* If requested, set return pointer to signature(s) */
1779 if (return_signatures != NULL) {
1780 *return_signatures = ctx->sig;
1781 }
1782
1783 return PDKIM_OK;
1784}
1785
1786
1787/* -------------------------------------------------------------------------- */
1788DLLEXPORT pdkim_ctx *pdkim_init_verify(int input_mode,
1789 int(*dns_txt_callback)(char *, char *)
1790 ) {
1791 pdkim_ctx *ctx = malloc(sizeof(pdkim_ctx));
1792 if (ctx == NULL) return NULL;
1793 memset(ctx,0,sizeof(pdkim_ctx));
1794
1795 ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN);
1796 if (ctx->linebuf == NULL) {
1797 free(ctx);
1798 return NULL;
1799 }
1800
1801 ctx->mode = PDKIM_MODE_VERIFY;
1802 ctx->input_mode = input_mode;
1803 ctx->dns_txt_callback = dns_txt_callback;
1804
1805 return ctx;
1806}
1807
1808
1809/* -------------------------------------------------------------------------- */
1810DLLEXPORT pdkim_ctx *pdkim_init_sign(int input_mode,
1811 char *domain,
1812 char *selector,
1813 char *rsa_privkey) {
1814 pdkim_ctx *ctx;
1815 pdkim_signature *sig;
1816
1817 if (!domain || !selector || !rsa_privkey) return NULL;
1818
1819 ctx = malloc(sizeof(pdkim_ctx));
1820 if (ctx == NULL) return NULL;
1821 memset(ctx,0,sizeof(pdkim_ctx));
1822
1823 ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN);
1824 if (ctx->linebuf == NULL) {
1825 free(ctx);
1826 return NULL;
1827 }
1828
1829 sig = malloc(sizeof(pdkim_signature));
1830 if (sig == NULL) {
1831 free(ctx->linebuf);
1832 free(ctx);
1833 return NULL;
1834 }
1835 memset(sig,0,sizeof(pdkim_signature));
1836 sig->bodylength = -1;
1837
1838 ctx->mode = PDKIM_MODE_SIGN;
1839 ctx->input_mode = input_mode;
1840 ctx->sig = sig;
1841
1842 ctx->sig->domain = strdup(domain);
1843 ctx->sig->selector = strdup(selector);
1844 ctx->sig->rsa_privkey = strdup(rsa_privkey);
1845
1846 if (!ctx->sig->domain || !ctx->sig->selector || !ctx->sig->rsa_privkey) {
1847 pdkim_free_ctx(ctx);
1848 return NULL;
1849 }
1850
1851 ctx->sig->sha1_body = malloc(sizeof(sha1_context));
1852 if (ctx->sig->sha1_body == NULL) {
1853 pdkim_free_ctx(ctx);
1854 return NULL;
1855 }
1856 sha1_starts(ctx->sig->sha1_body);
1857
1858 ctx->sig->sha2_body = malloc(sizeof(sha2_context));
1859 if (ctx->sig->sha2_body == NULL) {
1860 pdkim_free_ctx(ctx);
1861 return NULL;
1862 }
1863 sha2_starts(ctx->sig->sha2_body,0);
1864
1865 return ctx;
6ab02e3f 1866}
80a47a2c
TK		 1867
1868#ifdef PDKIM_DEBUG
1869/* -------------------------------------------------------------------------- */
1870DLLEXPORT void pdkim_set_debug_stream(pdkim_ctx *ctx,
1871 FILE *debug_stream) {
1872 ctx->debug_stream = debug_stream;
6ab02e3f 1873}
80a47a2c
TK		 1874#endif
1875
1876/* -------------------------------------------------------------------------- */
1877DLLEXPORT int pdkim_set_optional(pdkim_ctx *ctx,
1878 char *sign_headers,
1879 char *identity,
1880 int canon_headers,
1881 int canon_body,
1882 long bodylength,
1883 int algo,
1884 unsigned long created,
1885 unsigned long expires) {
1886
1887 if (identity != NULL) {
1888 ctx->sig->identity = strdup(identity);
1889 if (ctx->sig->identity == NULL) return PDKIM_ERR_OOM;
1890 }
1891
1892 if (sign_headers != NULL) {
1893 ctx->sig->sign_headers = strdup(sign_headers);
1894 if (ctx->sig->sign_headers == NULL) return PDKIM_ERR_OOM;
1895 }
1896
1897 ctx->sig->canon_headers = canon_headers;
1898 ctx->sig->canon_body = canon_body;
1899 ctx->sig->bodylength = bodylength;
1900 ctx->sig->algo = algo;
1901 ctx->sig->created = created;
1902 ctx->sig->expires = expires;
1903
1904 return PDKIM_OK;
6ab02e3f 1905}
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