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diff --git a/src/lib/libcrypto/asn1/asn_mime.c b/src/lib/libcrypto/asn1/asn_mime.c
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1/* asn_mime.c */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project.
4 */
5/* ====================================================================
6 * Copyright (c) 1999-2008 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 */
54
55#include <stdio.h>
56#include <ctype.h>
57#include "cryptlib.h"
58#include <openssl/rand.h>
59#include <openssl/x509.h>
60#include <openssl/asn1.h>
61#include <openssl/asn1t.h>
62
63/* Generalised MIME like utilities for streaming ASN1. Although many
64 * have a PKCS7/CMS like flavour others are more general purpose.
65 */
66
67/* MIME format structures
68 * Note that all are translated to lower case apart from
69 * parameter values. Quotes are stripped off
70 */
71
72typedef struct {
73char *param_name; /* Param name e.g. "micalg" */
74char *param_value; /* Param value e.g. "sha1" */
75} MIME_PARAM;
76
77DECLARE_STACK_OF(MIME_PARAM)
78IMPLEMENT_STACK_OF(MIME_PARAM)
79
80typedef struct {
81char *name; /* Name of line e.g. "content-type" */
82char *value; /* Value of line e.g. "text/plain" */
83STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
84} MIME_HEADER;
85
86DECLARE_STACK_OF(MIME_HEADER)
87IMPLEMENT_STACK_OF(MIME_HEADER)
88
89static char * strip_ends(char *name);
90static char * strip_start(char *name);
91static char * strip_end(char *name);
92static MIME_HEADER *mime_hdr_new(char *name, char *value);
93static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
94static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
95static int mime_hdr_cmp(const MIME_HEADER * const *a,
96 const MIME_HEADER * const *b);
97static int mime_param_cmp(const MIME_PARAM * const *a,
98 const MIME_PARAM * const *b);
99static void mime_param_free(MIME_PARAM *param);
100static int mime_bound_check(char *line, int linelen, char *bound, int blen);
101static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
102static int strip_eol(char *linebuf, int *plen);
103static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
104static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
105static void mime_hdr_free(MIME_HEADER *hdr);
106
107#define MAX_SMLEN 1024
108#define mime_debug(x) /* x */
109
110/* Base 64 read and write of ASN1 structure */
111
112static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
113 const ASN1_ITEM *it)
114 {
115 BIO *b64;
116 int r;
117 b64 = BIO_new(BIO_f_base64());
118 if(!b64)
119 {
120 ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE);
121 return 0;
122 }
123 /* prepend the b64 BIO so all data is base64 encoded.
124 */
125 out = BIO_push(b64, out);
126 r = ASN1_item_i2d_bio(it, out, val);
127 (void)BIO_flush(out);
128 BIO_pop(out);
129 BIO_free(b64);
130 return r;
131 }
132
133static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
134{
135 BIO *b64;
136 ASN1_VALUE *val;
137 if(!(b64 = BIO_new(BIO_f_base64()))) {
138 ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE);
139 return 0;
140 }
141 bio = BIO_push(b64, bio);
142 val = ASN1_item_d2i_bio(it, bio, NULL);
143 if(!val)
144 ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR);
145 (void)BIO_flush(bio);
146 bio = BIO_pop(bio);
147 BIO_free(b64);
148 return val;
149}
150
151/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
152
153static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
154 {
155 const EVP_MD *md;
156 int i, have_unknown = 0, write_comma, md_nid;
157 have_unknown = 0;
158 write_comma = 0;
159 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++)
160 {
161 if (write_comma)
162 BIO_write(out, ",", 1);
163 write_comma = 1;
164 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
165 md = EVP_get_digestbynid(md_nid);
166 switch(md_nid)
167 {
168 case NID_sha1:
169 BIO_puts(out, "sha1");
170 break;
171
172 case NID_md5:
173 BIO_puts(out, "md5");
174 break;
175
176 case NID_sha256:
177 BIO_puts(out, "sha-256");
178 break;
179
180 case NID_sha384:
181 BIO_puts(out, "sha-384");
182 break;
183
184 case NID_sha512:
185 BIO_puts(out, "sha-512");
186 break;
187
188 default:
189 if (have_unknown)
190 write_comma = 0;
191 else
192 {
193 BIO_puts(out, "unknown");
194 have_unknown = 1;
195 }
196 break;
197
198 }
199 }
200
201 return 1;
202
203 }
204
205/* SMIME sender */
206
207int int_smime_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
208 int ctype_nid, int econt_nid,
209 STACK_OF(X509_ALGOR) *mdalgs,
210 asn1_output_data_fn *data_fn,
211 const ASN1_ITEM *it)
212{
213 char bound[33], c;
214 int i;
215 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
216 const char *msg_type=NULL;
217 if (flags & SMIME_OLDMIME)
218 mime_prefix = "application/x-pkcs7-";
219 else
220 mime_prefix = "application/pkcs7-";
221
222 if (flags & SMIME_CRLFEOL)
223 mime_eol = "\r\n";
224 else
225 mime_eol = "\n";
226 if((flags & SMIME_DETACHED) && data) {
227 /* We want multipart/signed */
228 /* Generate a random boundary */
229 RAND_pseudo_bytes((unsigned char *)bound, 32);
230 for(i = 0; i < 32; i++) {
231 c = bound[i] & 0xf;
232 if(c < 10) c += '0';
233 else c += 'A' - 10;
234 bound[i] = c;
235 }
236 bound[32] = 0;
237 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
238 BIO_printf(bio, "Content-Type: multipart/signed;");
239 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
240 BIO_puts(bio, " micalg=\"");
241 asn1_write_micalg(bio, mdalgs);
242 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
243 bound, mime_eol, mime_eol);
244 BIO_printf(bio, "This is an S/MIME signed message%s%s",
245 mime_eol, mime_eol);
246 /* Now write out the first part */
247 BIO_printf(bio, "------%s%s", bound, mime_eol);
248 if (!data_fn(bio, data, val, flags, it))
249 return 0;
250 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
251
252 /* Headers for signature */
253
254 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
255 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
256 BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
257 mime_eol);
258 BIO_printf(bio, "Content-Disposition: attachment;");
259 BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
260 mime_eol, mime_eol);
261 B64_write_ASN1(bio, val, NULL, 0, it);
262 BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound,
263 mime_eol, mime_eol);
264 return 1;
265 }
266
267 /* Determine smime-type header */
268
269 if (ctype_nid == NID_pkcs7_enveloped)
270 msg_type = "enveloped-data";
271 else if (ctype_nid == NID_pkcs7_signed)
272 {
273 if (econt_nid == NID_id_smime_ct_receipt)
274 msg_type = "signed-receipt";
275 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
276 msg_type = "signed-data";
277 else
278 msg_type = "certs-only";
279 }
280 else if (ctype_nid == NID_id_smime_ct_compressedData)
281 {
282 msg_type = "compressed-data";
283 cname = "smime.p7z";
284 }
285 /* MIME headers */
286 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
287 BIO_printf(bio, "Content-Disposition: attachment;");
288 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
289 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
290 if (msg_type)
291 BIO_printf(bio, " smime-type=%s;", msg_type);
292 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
293 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
294 mime_eol, mime_eol);
295 if (!B64_write_ASN1(bio, val, data, flags, it))
296 return 0;
297 BIO_printf(bio, "%s", mime_eol);
298 return 1;
299}
300
301#if 0
302
303/* Handle output of ASN1 data */
304
305
306static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
307 const ASN1_ITEM *it)
308 {
309 BIO *tmpbio;
310 const ASN1_AUX *aux = it->funcs;
311 ASN1_STREAM_ARG sarg;
312
313 if (!(flags & SMIME_DETACHED))
314 {
315 SMIME_crlf_copy(data, out, flags);
316 return 1;
317 }
318
319 if (!aux || !aux->asn1_cb)
320 {
321 ASN1err(ASN1_F_ASN1_OUTPUT_DATA,
322 ASN1_R_STREAMING_NOT_SUPPORTED);
323 return 0;
324 }
325
326 sarg.out = out;
327 sarg.ndef_bio = NULL;
328 sarg.boundary = NULL;
329
330 /* Let ASN1 code prepend any needed BIOs */
331
332 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
333 return 0;
334
335 /* Copy data across, passing through filter BIOs for processing */
336 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
337
338 /* Finalize structure */
339 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
340 return 0;
341
342 /* Now remove any digests prepended to the BIO */
343
344 while (sarg.ndef_bio != out)
345 {
346 tmpbio = BIO_pop(sarg.ndef_bio);
347 BIO_free(sarg.ndef_bio);
348 sarg.ndef_bio = tmpbio;
349 }
350
351 return 1;
352
353 }
354
355#endif
356
357/* SMIME reader: handle multipart/signed and opaque signing.
358 * in multipart case the content is placed in a memory BIO
359 * pointed to by "bcont". In opaque this is set to NULL
360 */
361
362ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
363{
364 BIO *asnin;
365 STACK_OF(MIME_HEADER) *headers = NULL;
366 STACK_OF(BIO) *parts = NULL;
367 MIME_HEADER *hdr;
368 MIME_PARAM *prm;
369 ASN1_VALUE *val;
370 int ret;
371
372 if(bcont) *bcont = NULL;
373
374 if (!(headers = mime_parse_hdr(bio))) {
375 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR);
376 return NULL;
377 }
378
379 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
380 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
381 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
382 return NULL;
383 }
384
385 /* Handle multipart/signed */
386
387 if(!strcmp(hdr->value, "multipart/signed")) {
388 /* Split into two parts */
389 prm = mime_param_find(hdr, "boundary");
390 if(!prm || !prm->param_value) {
391 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
392 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
393 return NULL;
394 }
395 ret = multi_split(bio, prm->param_value, &parts);
396 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
397 if(!ret || (sk_BIO_num(parts) != 2) ) {
398 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
399 sk_BIO_pop_free(parts, BIO_vfree);
400 return NULL;
401 }
402
403 /* Parse the signature piece */
404 asnin = sk_BIO_value(parts, 1);
405
406 if (!(headers = mime_parse_hdr(asnin))) {
407 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR);
408 sk_BIO_pop_free(parts, BIO_vfree);
409 return NULL;
410 }
411
412 /* Get content type */
413
414 if(!(hdr = mime_hdr_find(headers, "content-type")) ||
415 !hdr->value) {
416 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
417 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
418 return NULL;
419 }
420
421 if(strcmp(hdr->value, "application/x-pkcs7-signature") &&
422 strcmp(hdr->value, "application/pkcs7-signature")) {
423 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
424 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE);
425 ERR_add_error_data(2, "type: ", hdr->value);
426 sk_BIO_pop_free(parts, BIO_vfree);
427 return NULL;
428 }
429 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
430 /* Read in ASN1 */
431 if(!(val = b64_read_asn1(asnin, it))) {
432 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR);
433 sk_BIO_pop_free(parts, BIO_vfree);
434 return NULL;
435 }
436
437 if(bcont) {
438 *bcont = sk_BIO_value(parts, 0);
439 BIO_free(asnin);
440 sk_BIO_free(parts);
441 } else sk_BIO_pop_free(parts, BIO_vfree);
442 return val;
443 }
444
445 /* OK, if not multipart/signed try opaque signature */
446
447 if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
448 strcmp (hdr->value, "application/pkcs7-mime")) {
449 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE);
450 ERR_add_error_data(2, "type: ", hdr->value);
451 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
452 return NULL;
453 }
454
455 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
456
457 if(!(val = b64_read_asn1(bio, it))) {
458 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
459 return NULL;
460 }
461 return val;
462
463}
464
465/* Copy text from one BIO to another making the output CRLF at EOL */
466int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
467{
468 BIO *bf;
469 char eol;
470 int len;
471 char linebuf[MAX_SMLEN];
472 /* Buffer output so we don't write one line at a time. This is
473 * useful when streaming as we don't end up with one OCTET STRING
474 * per line.
475 */
476 bf = BIO_new(BIO_f_buffer());
477 if (!bf)
478 return 0;
479 out = BIO_push(bf, out);
480 if(flags & SMIME_BINARY)
481 {
482 while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
483 BIO_write(out, linebuf, len);
484 }
485 else
486 {
487 if(flags & SMIME_TEXT)
488 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
489 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0)
490 {
491 eol = strip_eol(linebuf, &len);
492 if (len)
493 BIO_write(out, linebuf, len);
494 if(eol) BIO_write(out, "\r\n", 2);
495 }
496 }
497 (void)BIO_flush(out);
498 BIO_pop(out);
499 BIO_free(bf);
500 return 1;
501}
502
503/* Strip off headers if they are text/plain */
504int SMIME_text(BIO *in, BIO *out)
505{
506 char iobuf[4096];
507 int len;
508 STACK_OF(MIME_HEADER) *headers;
509 MIME_HEADER *hdr;
510
511 if (!(headers = mime_parse_hdr(in))) {
512 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR);
513 return 0;
514 }
515 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
516 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE);
517 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
518 return 0;
519 }
520 if (strcmp (hdr->value, "text/plain")) {
521 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE);
522 ERR_add_error_data(2, "type: ", hdr->value);
523 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
524 return 0;
525 }
526 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
527 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
528 BIO_write(out, iobuf, len);
529 if (len < 0)
530 return 0;
531 return 1;
532}
533
534/* Split a multipart/XXX message body into component parts: result is
535 * canonical parts in a STACK of bios
536 */
537
538static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
539{
540 char linebuf[MAX_SMLEN];
541 int len, blen;
542 int eol = 0, next_eol = 0;
543 BIO *bpart = NULL;
544 STACK_OF(BIO) *parts;
545 char state, part, first;
546
547 blen = strlen(bound);
548 part = 0;
549 state = 0;
550 first = 1;
551 parts = sk_BIO_new_null();
552 *ret = parts;
553 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
554 state = mime_bound_check(linebuf, len, bound, blen);
555 if(state == 1) {
556 first = 1;
557 part++;
558 } else if(state == 2) {
559 sk_BIO_push(parts, bpart);
560 return 1;
561 } else if(part) {
562 /* Strip CR+LF from linebuf */
563 next_eol = strip_eol(linebuf, &len);
564 if(first) {
565 first = 0;
566 if(bpart) sk_BIO_push(parts, bpart);
567 bpart = BIO_new(BIO_s_mem());
568 BIO_set_mem_eof_return(bpart, 0);
569 } else if (eol)
570 BIO_write(bpart, "\r\n", 2);
571 eol = next_eol;
572 if (len)
573 BIO_write(bpart, linebuf, len);
574 }
575 }
576 return 0;
577}
578
579/* This is the big one: parse MIME header lines up to message body */
580
581#define MIME_INVALID 0
582#define MIME_START 1
583#define MIME_TYPE 2
584#define MIME_NAME 3
585#define MIME_VALUE 4
586#define MIME_QUOTE 5
587#define MIME_COMMENT 6
588
589
590static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
591{
592 char *p, *q, c;
593 char *ntmp;
594 char linebuf[MAX_SMLEN];
595 MIME_HEADER *mhdr = NULL;
596 STACK_OF(MIME_HEADER) *headers;
597 int len, state, save_state = 0;
598
599 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
600 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
601 /* If whitespace at line start then continuation line */
602 if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME;
603 else state = MIME_START;
604 ntmp = NULL;
605 /* Go through all characters */
606 for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
607
608 /* State machine to handle MIME headers
609 * if this looks horrible that's because it *is*
610 */
611
612 switch(state) {
613 case MIME_START:
614 if(c == ':') {
615 state = MIME_TYPE;
616 *p = 0;
617 ntmp = strip_ends(q);
618 q = p + 1;
619 }
620 break;
621
622 case MIME_TYPE:
623 if(c == ';') {
624 mime_debug("Found End Value\n");
625 *p = 0;
626 mhdr = mime_hdr_new(ntmp, strip_ends(q));
627 sk_MIME_HEADER_push(headers, mhdr);
628 ntmp = NULL;
629 q = p + 1;
630 state = MIME_NAME;
631 } else if(c == '(') {
632 save_state = state;
633 state = MIME_COMMENT;
634 }
635 break;
636
637 case MIME_COMMENT:
638 if(c == ')') {
639 state = save_state;
640 }
641 break;
642
643 case MIME_NAME:
644 if(c == '=') {
645 state = MIME_VALUE;
646 *p = 0;
647 ntmp = strip_ends(q);
648 q = p + 1;
649 }
650 break ;
651
652 case MIME_VALUE:
653 if(c == ';') {
654 state = MIME_NAME;
655 *p = 0;
656 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
657 ntmp = NULL;
658 q = p + 1;
659 } else if (c == '"') {
660 mime_debug("Found Quote\n");
661 state = MIME_QUOTE;
662 } else if(c == '(') {
663 save_state = state;
664 state = MIME_COMMENT;
665 }
666 break;
667
668 case MIME_QUOTE:
669 if(c == '"') {
670 mime_debug("Found Match Quote\n");
671 state = MIME_VALUE;
672 }
673 break;
674 }
675 }
676
677 if(state == MIME_TYPE) {
678 mhdr = mime_hdr_new(ntmp, strip_ends(q));
679 sk_MIME_HEADER_push(headers, mhdr);
680 } else if(state == MIME_VALUE)
681 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
682 if(p == linebuf) break; /* Blank line means end of headers */
683}
684
685return headers;
686
687}
688
689static char *strip_ends(char *name)
690{
691 return strip_end(strip_start(name));
692}
693
694/* Strip a parameter of whitespace from start of param */
695static char *strip_start(char *name)
696{
697 char *p, c;
698 /* Look for first non white space or quote */
699 for(p = name; (c = *p) ;p++) {
700 if(c == '"') {
701 /* Next char is start of string if non null */
702 if(p[1]) return p + 1;
703 /* Else null string */
704 return NULL;
705 }
706 if(!isspace((unsigned char)c)) return p;
707 }
708 return NULL;
709}
710
711/* As above but strip from end of string : maybe should handle brackets? */
712static char *strip_end(char *name)
713{
714 char *p, c;
715 if(!name) return NULL;
716 /* Look for first non white space or quote */
717 for(p = name + strlen(name) - 1; p >= name ;p--) {
718 c = *p;
719 if(c == '"') {
720 if(p - 1 == name) return NULL;
721 *p = 0;
722 return name;
723 }
724 if(isspace((unsigned char)c)) *p = 0;
725 else return name;
726 }
727 return NULL;
728}
729
730static MIME_HEADER *mime_hdr_new(char *name, char *value)
731{
732 MIME_HEADER *mhdr;
733 char *tmpname, *tmpval, *p;
734 int c;
735 if(name) {
736 if(!(tmpname = BUF_strdup(name))) return NULL;
737 for(p = tmpname ; *p; p++) {
738 c = *p;
739 if(isupper(c)) {
740 c = tolower(c);
741 *p = c;
742 }
743 }
744 } else tmpname = NULL;
745 if(value) {
746 if(!(tmpval = BUF_strdup(value))) return NULL;
747 for(p = tmpval ; *p; p++) {
748 c = *p;
749 if(isupper(c)) {
750 c = tolower(c);
751 *p = c;
752 }
753 }
754 } else tmpval = NULL;
755 mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER));
756 if(!mhdr) return NULL;
757 mhdr->name = tmpname;
758 mhdr->value = tmpval;
759 if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL;
760 return mhdr;
761}
762
763static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
764{
765 char *tmpname, *tmpval, *p;
766 int c;
767 MIME_PARAM *mparam;
768 if(name) {
769 tmpname = BUF_strdup(name);
770 if(!tmpname) return 0;
771 for(p = tmpname ; *p; p++) {
772 c = *p;
773 if(isupper(c)) {
774 c = tolower(c);
775 *p = c;
776 }
777 }
778 } else tmpname = NULL;
779 if(value) {
780 tmpval = BUF_strdup(value);
781 if(!tmpval) return 0;
782 } else tmpval = NULL;
783 /* Parameter values are case sensitive so leave as is */
784 mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM));
785 if(!mparam) return 0;
786 mparam->param_name = tmpname;
787 mparam->param_value = tmpval;
788 sk_MIME_PARAM_push(mhdr->params, mparam);
789 return 1;
790}
791
792static int mime_hdr_cmp(const MIME_HEADER * const *a,
793 const MIME_HEADER * const *b)
794{
795 return(strcmp((*a)->name, (*b)->name));
796}
797
798static int mime_param_cmp(const MIME_PARAM * const *a,
799 const MIME_PARAM * const *b)
800{
801 return(strcmp((*a)->param_name, (*b)->param_name));
802}
803
804/* Find a header with a given name (if possible) */
805
806static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
807{
808 MIME_HEADER htmp;
809 int idx;
810 htmp.name = name;
811 idx = sk_MIME_HEADER_find(hdrs, &htmp);
812 if(idx < 0) return NULL;
813 return sk_MIME_HEADER_value(hdrs, idx);
814}
815
816static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
817{
818 MIME_PARAM param;
819 int idx;
820 param.param_name = name;
821 idx = sk_MIME_PARAM_find(hdr->params, &param);
822 if(idx < 0) return NULL;
823 return sk_MIME_PARAM_value(hdr->params, idx);
824}
825
826static void mime_hdr_free(MIME_HEADER *hdr)
827{
828 if(hdr->name) OPENSSL_free(hdr->name);
829 if(hdr->value) OPENSSL_free(hdr->value);
830 if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
831 OPENSSL_free(hdr);
832}
833
834static void mime_param_free(MIME_PARAM *param)
835{
836 if(param->param_name) OPENSSL_free(param->param_name);
837 if(param->param_value) OPENSSL_free(param->param_value);
838 OPENSSL_free(param);
839}
840
841/* Check for a multipart boundary. Returns:
842 * 0 : no boundary
843 * 1 : part boundary
844 * 2 : final boundary
845 */
846static int mime_bound_check(char *line, int linelen, char *bound, int blen)
847{
848 if(linelen == -1) linelen = strlen(line);
849 if(blen == -1) blen = strlen(bound);
850 /* Quickly eliminate if line length too short */
851 if(blen + 2 > linelen) return 0;
852 /* Check for part boundary */
853 if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
854 if(!strncmp(line + blen + 2, "--", 2)) return 2;
855 else return 1;
856 }
857 return 0;
858}
859
860static int strip_eol(char *linebuf, int *plen)
861 {
862 int len = *plen;
863 char *p, c;
864 int is_eol = 0;
865 p = linebuf + len - 1;
866 for (p = linebuf + len - 1; len > 0; len--, p--)
867 {
868 c = *p;
869 if (c == '\n')
870 is_eol = 1;
871 else if (c != '\r')
872 break;
873 }
874 *plen = len;
875 return is_eol;
876 }
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-04 03:39:28 +0000