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diff --git a/src/lib/libcrypto/asn1/asn_mime.c b/src/lib/libcrypto/asn1/asn_mime.c
deleted file mode 100644
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--- a/src/lib/libcrypto/asn1/asn_mime.c
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1/* $OpenBSD: asn_mime.c,v 1.26 2015/02/22 15:19:56 jsing Exp $ */
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 <ctype.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59
60#include <openssl/asn1.h>
61#include <openssl/asn1t.h>
62#include <openssl/err.h>
63#include <openssl/x509.h>
64
65#include "asn1_locl.h"
66
67/* Generalised MIME like utilities for streaming ASN1. Although many
68 * have a PKCS7/CMS like flavour others are more general purpose.
69 */
70
71/* MIME format structures
72 * Note that all are translated to lower case apart from
73 * parameter values. Quotes are stripped off
74 */
75
76typedef struct {
77 char *param_name; /* Param name e.g. "micalg" */
78 char *param_value; /* Param value e.g. "sha1" */
79} MIME_PARAM;
80
81DECLARE_STACK_OF(MIME_PARAM)
82
83typedef struct {
84 char *name; /* Name of line e.g. "content-type" */
85 char *value; /* Value of line e.g. "text/plain" */
86 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
87} MIME_HEADER;
88
89DECLARE_STACK_OF(MIME_HEADER)
90
91static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
92 const ASN1_ITEM *it);
93static char * strip_ends(char *name);
94static char * strip_start(char *name);
95static char * strip_end(char *name);
96static MIME_HEADER *mime_hdr_new(char *name, char *value);
97static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
98static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
99static int mime_hdr_cmp(const MIME_HEADER * const *a,
100 const MIME_HEADER * const *b);
101static int mime_param_cmp(const MIME_PARAM * const *a,
102 const MIME_PARAM * const *b);
103static void mime_param_free(MIME_PARAM *param);
104static int mime_bound_check(char *line, int linelen, char *bound, int blen);
105static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
106static int strip_eol(char *linebuf, int *plen);
107static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
108static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
109static void mime_hdr_free(MIME_HEADER *hdr);
110
111#define MAX_SMLEN 1024
112#define mime_debug(x) /* x */
113
114/* Output an ASN1 structure in BER format streaming if necessary */
115
116int
117i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
118 const ASN1_ITEM *it)
119{
120 /* If streaming create stream BIO and copy all content through it */
121 if (flags & SMIME_STREAM) {
122 BIO *bio, *tbio;
123 bio = BIO_new_NDEF(out, val, it);
124 if (!bio) {
125 ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM,
126 ERR_R_MALLOC_FAILURE);
127 return 0;
128 }
129 SMIME_crlf_copy(in, bio, flags);
130 (void)BIO_flush(bio);
131 /* Free up successive BIOs until we hit the old output BIO */
132 do {
133 tbio = BIO_pop(bio);
134 BIO_free(bio);
135 bio = tbio;
136 } while (bio != out);
137 }
138 /* else just write out ASN1 structure which will have all content
139 * stored internally
140 */
141 else
142 ASN1_item_i2d_bio(it, out, val);
143 return 1;
144}
145
146/* Base 64 read and write of ASN1 structure */
147
148static int
149B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
150 const ASN1_ITEM *it)
151{
152 BIO *b64;
153 int r;
154
155 b64 = BIO_new(BIO_f_base64());
156 if (!b64) {
157 ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
158 return 0;
159 }
160 /* prepend the b64 BIO so all data is base64 encoded.
161 */
162 out = BIO_push(b64, out);
163 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
164 (void)BIO_flush(out);
165 BIO_pop(out);
166 BIO_free(b64);
167 return r;
168}
169
170/* Streaming ASN1 PEM write */
171
172int
173PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
174 const char *hdr, const ASN1_ITEM *it)
175{
176 int r;
177
178 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
179 r = B64_write_ASN1(out, val, in, flags, it);
180 BIO_printf(out, "-----END %s-----\n", hdr);
181 return r;
182}
183
184static ASN1_VALUE *
185b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
186{
187 BIO *b64;
188 ASN1_VALUE *val;
189 if (!(b64 = BIO_new(BIO_f_base64()))) {
190 ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
191 return 0;
192 }
193 bio = BIO_push(b64, bio);
194 val = ASN1_item_d2i_bio(it, bio, NULL);
195 if (!val)
196 ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
197 (void)BIO_flush(bio);
198 bio = BIO_pop(bio);
199 BIO_free(b64);
200 return val;
201}
202
203/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
204
205static int
206asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
207{
208 const EVP_MD *md;
209 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
210
211 have_unknown = 0;
212 write_comma = 0;
213 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
214 if (write_comma)
215 BIO_write(out, ",", 1);
216 write_comma = 1;
217 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
218 md = EVP_get_digestbynid(md_nid);
219 if (md && md->md_ctrl) {
220 int rv;
221 char *micstr;
222 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
223 if (rv > 0) {
224 BIO_puts(out, micstr);
225 free(micstr);
226 continue;
227 }
228 if (rv != -2)
229 goto err;
230 }
231 switch (md_nid) {
232 case NID_sha1:
233 BIO_puts(out, "sha1");
234 break;
235
236 case NID_md5:
237 BIO_puts(out, "md5");
238 break;
239
240 case NID_sha256:
241 BIO_puts(out, "sha-256");
242 break;
243
244 case NID_sha384:
245 BIO_puts(out, "sha-384");
246 break;
247
248 case NID_sha512:
249 BIO_puts(out, "sha-512");
250 break;
251
252 case NID_id_GostR3411_94:
253 BIO_puts(out, "gostr3411-94");
254 goto err;
255 break;
256
257 default:
258 if (have_unknown)
259 write_comma = 0;
260 else {
261 BIO_puts(out, "unknown");
262 have_unknown = 1;
263 }
264 break;
265
266 }
267 }
268
269 ret = 1;
270
271err:
272 return ret;
273}
274
275/* SMIME sender */
276
277int
278SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
279 int ctype_nid, int econt_nid, STACK_OF(X509_ALGOR) *mdalgs,
280 const ASN1_ITEM *it)
281{
282 char bound[33], c;
283 int i;
284 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
285 const char *msg_type = NULL;
286
287 if (flags & SMIME_OLDMIME)
288 mime_prefix = "application/x-pkcs7-";
289 else
290 mime_prefix = "application/pkcs7-";
291
292 if (flags & SMIME_CRLFEOL)
293 mime_eol = "\r\n";
294 else
295 mime_eol = "\n";
296 if ((flags & SMIME_DETACHED) && data) {
297 /* We want multipart/signed */
298 /* Generate a random boundary */
299 arc4random_buf(bound, 32);
300 for (i = 0; i < 32; i++) {
301 c = bound[i] & 0xf;
302 if (c < 10)
303 c += '0';
304 else
305 c += 'A' - 10;
306 bound[i] = c;
307 }
308 bound[32] = 0;
309 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
310 BIO_printf(bio, "Content-Type: multipart/signed;");
311 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
312 BIO_puts(bio, " micalg=\"");
313 asn1_write_micalg(bio, mdalgs);
314 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
315 bound, mime_eol, mime_eol);
316 BIO_printf(bio, "This is an S/MIME signed message%s%s",
317 mime_eol, mime_eol);
318 /* Now write out the first part */
319 BIO_printf(bio, "------%s%s", bound, mime_eol);
320 if (!asn1_output_data(bio, data, val, flags, it))
321 return 0;
322 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
323
324 /* Headers for signature */
325
326 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
327 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
328 BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
329 mime_eol);
330 BIO_printf(bio, "Content-Disposition: attachment;");
331 BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
332 mime_eol, mime_eol);
333 B64_write_ASN1(bio, val, NULL, 0, it);
334 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
335 mime_eol, mime_eol);
336 return 1;
337 }
338
339 /* Determine smime-type header */
340
341 if (ctype_nid == NID_pkcs7_enveloped)
342 msg_type = "enveloped-data";
343 else if (ctype_nid == NID_pkcs7_signed) {
344 if (econt_nid == NID_id_smime_ct_receipt)
345 msg_type = "signed-receipt";
346 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
347 msg_type = "signed-data";
348 else
349 msg_type = "certs-only";
350 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
351 msg_type = "compressed-data";
352 cname = "smime.p7z";
353 }
354 /* MIME headers */
355 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
356 BIO_printf(bio, "Content-Disposition: attachment;");
357 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
358 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
359 if (msg_type)
360 BIO_printf(bio, " smime-type=%s;", msg_type);
361 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
362 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
363 mime_eol, mime_eol);
364 if (!B64_write_ASN1(bio, val, data, flags, it))
365 return 0;
366 BIO_printf(bio, "%s", mime_eol);
367 return 1;
368}
369
370/* Handle output of ASN1 data */
371
372
373static int
374asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
375 const ASN1_ITEM *it)
376{
377 BIO *tmpbio;
378 const ASN1_AUX *aux = it->funcs;
379 ASN1_STREAM_ARG sarg;
380 int rv = 1;
381
382 /* If data is not deteched or resigning then the output BIO is
383 * already set up to finalise when it is written through.
384 */
385 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
386 SMIME_crlf_copy(data, out, flags);
387 return 1;
388 }
389
390 if (!aux || !aux->asn1_cb) {
391 ASN1err(ASN1_F_ASN1_OUTPUT_DATA,
392 ASN1_R_STREAMING_NOT_SUPPORTED);
393 return 0;
394 }
395
396 sarg.out = out;
397 sarg.ndef_bio = NULL;
398 sarg.boundary = NULL;
399
400 /* Let ASN1 code prepend any needed BIOs */
401
402 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
403 return 0;
404
405 /* Copy data across, passing through filter BIOs for processing */
406 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
407
408 /* Finalize structure */
409 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
410 rv = 0;
411
412 /* Now remove any digests prepended to the BIO */
413
414 while (sarg.ndef_bio != out) {
415 tmpbio = BIO_pop(sarg.ndef_bio);
416 BIO_free(sarg.ndef_bio);
417 sarg.ndef_bio = tmpbio;
418 }
419
420 return rv;
421}
422
423/* SMIME reader: handle multipart/signed and opaque signing.
424 * in multipart case the content is placed in a memory BIO
425 * pointed to by "bcont". In opaque this is set to NULL
426 */
427
428ASN1_VALUE *
429SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
430{
431 BIO *asnin;
432 STACK_OF(MIME_HEADER) *headers = NULL;
433 STACK_OF(BIO) *parts = NULL;
434 MIME_HEADER *hdr;
435 MIME_PARAM *prm;
436 ASN1_VALUE *val;
437 int ret;
438
439 if (bcont)
440 *bcont = NULL;
441
442 if (!(headers = mime_parse_hdr(bio))) {
443 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
444 return NULL;
445 }
446
447 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
448 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
449 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
450 return NULL;
451 }
452
453 /* Handle multipart/signed */
454
455 if (!strcmp(hdr->value, "multipart/signed")) {
456 /* Split into two parts */
457 prm = mime_param_find(hdr, "boundary");
458 if (!prm || !prm->param_value) {
459 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
460 ASN1err(ASN1_F_SMIME_READ_ASN1,
461 ASN1_R_NO_MULTIPART_BOUNDARY);
462 return NULL;
463 }
464 ret = multi_split(bio, prm->param_value, &parts);
465 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
466 if (!ret || (sk_BIO_num(parts) != 2) ) {
467 ASN1err(ASN1_F_SMIME_READ_ASN1,
468 ASN1_R_NO_MULTIPART_BODY_FAILURE);
469 sk_BIO_pop_free(parts, BIO_vfree);
470 return NULL;
471 }
472
473 /* Parse the signature piece */
474 asnin = sk_BIO_value(parts, 1);
475
476 if (!(headers = mime_parse_hdr(asnin))) {
477 ASN1err(ASN1_F_SMIME_READ_ASN1,
478 ASN1_R_MIME_SIG_PARSE_ERROR);
479 sk_BIO_pop_free(parts, BIO_vfree);
480 return NULL;
481 }
482
483 /* Get content type */
484
485 if (!(hdr = mime_hdr_find(headers, "content-type")) ||
486 !hdr->value) {
487 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
488 sk_BIO_pop_free(parts, BIO_vfree);
489 ASN1err(ASN1_F_SMIME_READ_ASN1,
490 ASN1_R_NO_SIG_CONTENT_TYPE);
491 return NULL;
492 }
493
494 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
495 strcmp(hdr->value, "application/pkcs7-signature")) {
496 ASN1err(ASN1_F_SMIME_READ_ASN1,
497 ASN1_R_SIG_INVALID_MIME_TYPE);
498 ERR_asprintf_error_data("type: %s", hdr->value);
499 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
500 sk_BIO_pop_free(parts, BIO_vfree);
501 return NULL;
502 }
503 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
504 /* Read in ASN1 */
505 if (!(val = b64_read_asn1(asnin, it))) {
506 ASN1err(ASN1_F_SMIME_READ_ASN1,
507 ASN1_R_ASN1_SIG_PARSE_ERROR);
508 sk_BIO_pop_free(parts, BIO_vfree);
509 return NULL;
510 }
511
512 if (bcont) {
513 *bcont = sk_BIO_value(parts, 0);
514 BIO_free(asnin);
515 sk_BIO_free(parts);
516 } else sk_BIO_pop_free(parts, BIO_vfree);
517 return val;
518 }
519
520 /* OK, if not multipart/signed try opaque signature */
521
522 if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
523 strcmp (hdr->value, "application/pkcs7-mime")) {
524 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
525 ERR_asprintf_error_data("type: %s", hdr->value);
526 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
527 return NULL;
528 }
529
530 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
531
532 if (!(val = b64_read_asn1(bio, it))) {
533 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
534 return NULL;
535 }
536 return val;
537}
538
539/* Copy text from one BIO to another making the output CRLF at EOL */
540int
541SMIME_crlf_copy(BIO *in, BIO *out, int flags)
542{
543 BIO *bf;
544 char eol;
545 int len;
546 char linebuf[MAX_SMLEN];
547
548 /* Buffer output so we don't write one line at a time. This is
549 * useful when streaming as we don't end up with one OCTET STRING
550 * per line.
551 */
552 bf = BIO_new(BIO_f_buffer());
553 if (!bf)
554 return 0;
555 out = BIO_push(bf, out);
556 if (flags & SMIME_BINARY) {
557 while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
558 BIO_write(out, linebuf, len);
559 } else {
560 if (flags & SMIME_TEXT)
561 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
562 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
563 eol = strip_eol(linebuf, &len);
564 if (len)
565 BIO_write(out, linebuf, len);
566 if (eol)
567 BIO_write(out, "\r\n", 2);
568 }
569 }
570 (void)BIO_flush(out);
571 BIO_pop(out);
572 BIO_free(bf);
573 return 1;
574}
575
576/* Strip off headers if they are text/plain */
577int
578SMIME_text(BIO *in, BIO *out)
579{
580 char iobuf[4096];
581 int len;
582 STACK_OF(MIME_HEADER) *headers;
583 MIME_HEADER *hdr;
584
585 if (!(headers = mime_parse_hdr(in))) {
586 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
587 return 0;
588 }
589 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
590 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
591 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
592 return 0;
593 }
594 if (strcmp (hdr->value, "text/plain")) {
595 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
596 ERR_asprintf_error_data("type: %s", hdr->value);
597 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
598 return 0;
599 }
600 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
601 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
602 BIO_write(out, iobuf, len);
603 if (len < 0)
604 return 0;
605 return 1;
606}
607
608/*
609 * Split a multipart/XXX message body into component parts: result is
610 * canonical parts in a STACK of bios
611 */
612static int
613multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
614{
615 char linebuf[MAX_SMLEN];
616 int len, blen;
617 int eol = 0, next_eol = 0;
618 BIO *bpart = NULL;
619 STACK_OF(BIO) *parts;
620 char state, part, first;
621
622 blen = strlen(bound);
623 part = 0;
624 state = 0;
625 first = 1;
626 parts = sk_BIO_new_null();
627 *ret = parts;
628 if (parts == NULL)
629 return 0;
630 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
631 state = mime_bound_check(linebuf, len, bound, blen);
632 if (state == 1) {
633 first = 1;
634 part++;
635 } else if (state == 2) {
636 if (sk_BIO_push(parts, bpart) == 0)
637 return 0;
638 return 1;
639 } else if (part) {
640 /* Strip CR+LF from linebuf */
641 next_eol = strip_eol(linebuf, &len);
642 if (first) {
643 first = 0;
644 if (bpart != NULL) {
645 if (sk_BIO_push(parts, bpart) == 0)
646 return 0;
647 }
648 bpart = BIO_new(BIO_s_mem());
649 if (bpart == NULL)
650 return 0;
651 BIO_set_mem_eof_return(bpart, 0);
652 } else if (eol)
653 BIO_write(bpart, "\r\n", 2);
654 eol = next_eol;
655 if (len)
656 BIO_write(bpart, linebuf, len);
657 }
658 }
659 BIO_free(bpart);
660 return 0;
661}
662
663/* This is the big one: parse MIME header lines up to message body */
664
665#define MIME_INVALID 0
666#define MIME_START 1
667#define MIME_TYPE 2
668#define MIME_NAME 3
669#define MIME_VALUE 4
670#define MIME_QUOTE 5
671#define MIME_COMMENT 6
672
673
674static
675STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
676{
677 char *p, *q, c;
678 char *ntmp;
679 char linebuf[MAX_SMLEN];
680 MIME_HEADER *mhdr = NULL;
681 STACK_OF(MIME_HEADER) *headers;
682 int len, state, save_state = 0;
683
684 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
685 if (!headers)
686 return NULL;
687 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
688 /* If whitespace at line start then continuation line */
689 if (mhdr && isspace((unsigned char)linebuf[0]))
690 state = MIME_NAME;
691 else
692 state = MIME_START;
693 ntmp = NULL;
694
695 /* Go through all characters */
696 for (p = linebuf, q = linebuf;
697 (c = *p) && (c != '\r') && (c != '\n'); p++) {
698
699 /* State machine to handle MIME headers
700 * if this looks horrible that's because it *is*
701 */
702
703 switch (state) {
704 case MIME_START:
705 if (c == ':') {
706 state = MIME_TYPE;
707 *p = 0;
708 ntmp = strip_ends(q);
709 q = p + 1;
710 }
711 break;
712
713 case MIME_TYPE:
714 if (c == ';') {
715 mime_debug("Found End Value\n");
716 *p = 0;
717 mhdr = mime_hdr_new(ntmp,
718 strip_ends(q));
719 if (mhdr == NULL)
720 goto merr;
721 if (sk_MIME_HEADER_push(headers,
722 mhdr) == 0)
723 goto merr;
724 ntmp = NULL;
725 q = p + 1;
726 state = MIME_NAME;
727 } else if (c == '(') {
728 save_state = state;
729 state = MIME_COMMENT;
730 }
731 break;
732
733 case MIME_COMMENT:
734 if (c == ')') {
735 state = save_state;
736 }
737 break;
738
739 case MIME_NAME:
740 if (c == '=') {
741 state = MIME_VALUE;
742 *p = 0;
743 ntmp = strip_ends(q);
744 q = p + 1;
745 }
746 break;
747
748 case MIME_VALUE:
749 if (c == ';') {
750 state = MIME_NAME;
751 *p = 0;
752 mime_hdr_addparam(mhdr, ntmp,
753 strip_ends(q));
754 ntmp = NULL;
755 q = p + 1;
756 } else if (c == '"') {
757 mime_debug("Found Quote\n");
758 state = MIME_QUOTE;
759 } else if (c == '(') {
760 save_state = state;
761 state = MIME_COMMENT;
762 }
763 break;
764
765 case MIME_QUOTE:
766 if (c == '"') {
767 mime_debug("Found Match Quote\n");
768 state = MIME_VALUE;
769 }
770 break;
771 }
772 }
773
774 if (state == MIME_TYPE) {
775 mhdr = mime_hdr_new(ntmp, strip_ends(q));
776 if (mhdr == NULL)
777 goto merr;
778 if (sk_MIME_HEADER_push(headers, mhdr) == 0)
779 goto merr;
780 } else if (state == MIME_VALUE)
781 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
782
783 if (p == linebuf)
784 break; /* Blank line means end of headers */
785 }
786
787 return headers;
788
789merr:
790 if (mhdr != NULL)
791 mime_hdr_free(mhdr);
792 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
793 return NULL;
794}
795
796static char *
797strip_ends(char *name)
798{
799 return strip_end(strip_start(name));
800}
801
802/* Strip a parameter of whitespace from start of param */
803static char *
804strip_start(char *name)
805{
806 char *p, c;
807
808 /* Look for first non white space or quote */
809 for (p = name; (c = *p); p++) {
810 if (c == '"') {
811 /* Next char is start of string if non null */
812 if (p[1])
813 return p + 1;
814 /* Else null string */
815 return NULL;
816 }
817 if (!isspace((unsigned char)c))
818 return p;
819 }
820 return NULL;
821}
822
823/* As above but strip from end of string : maybe should handle brackets? */
824static char *
825strip_end(char *name)
826{
827 char *p, c;
828
829 if (!name)
830 return NULL;
831
832 /* Look for first non white space or quote */
833 for (p = name + strlen(name) - 1; p >= name; p--) {
834 c = *p;
835 if (c == '"') {
836 if (p - 1 == name)
837 return NULL;
838 *p = 0;
839 return name;
840 }
841 if (isspace((unsigned char)c))
842 *p = 0;
843 else
844 return name;
845 }
846 return NULL;
847}
848
849static MIME_HEADER *
850mime_hdr_new(char *name, char *value)
851{
852 MIME_HEADER *mhdr;
853 char *tmpname = NULL, *tmpval = NULL, *p;
854
855 if (name) {
856 if (!(tmpname = strdup(name)))
857 goto err;
858 for (p = tmpname; *p; p++)
859 *p = tolower((unsigned char)*p);
860 }
861 if (value) {
862 if (!(tmpval = strdup(value)))
863 goto err;
864 for (p = tmpval; *p; p++)
865 *p = tolower((unsigned char)*p);
866 }
867 mhdr = malloc(sizeof(MIME_HEADER));
868 if (!mhdr)
869 goto err;
870 mhdr->name = tmpname;
871 mhdr->value = tmpval;
872 if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) {
873 free(mhdr);
874 goto err;
875 }
876 return mhdr;
877err:
878 free(tmpname);
879 free(tmpval);
880 return NULL;
881}
882
883static int
884mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
885{
886 char *tmpname = NULL, *tmpval = NULL, *p;
887 MIME_PARAM *mparam;
888
889 if (name) {
890 tmpname = strdup(name);
891 if (!tmpname)
892 goto err;
893 for (p = tmpname; *p; p++)
894 *p = tolower((unsigned char)*p);
895 }
896 if (value) {
897 tmpval = strdup(value);
898 if (!tmpval)
899 goto err;
900 }
901 /* Parameter values are case sensitive so leave as is */
902 mparam = malloc(sizeof(MIME_PARAM));
903 if (!mparam)
904 goto err;
905 mparam->param_name = tmpname;
906 mparam->param_value = tmpval;
907 if (sk_MIME_PARAM_push(mhdr->params, mparam) == 0) {
908 free(mparam);
909 goto err;
910 }
911 return 1;
912err:
913 free(tmpname);
914 free(tmpval);
915 return 0;
916}
917
918static int
919mime_hdr_cmp(const MIME_HEADER * const *a, const MIME_HEADER * const *b)
920{
921 if (!(*a)->name || !(*b)->name)
922 return !!(*a)->name - !!(*b)->name;
923 return (strcmp((*a)->name, (*b)->name));
924}
925
926static int
927mime_param_cmp(const MIME_PARAM * const *a, const MIME_PARAM * const *b)
928{
929 if (!(*a)->param_name || !(*b)->param_name)
930 return !!(*a)->param_name - !!(*b)->param_name;
931 return (strcmp((*a)->param_name, (*b)->param_name));
932}
933
934/* Find a header with a given name (if possible) */
935
936static MIME_HEADER *
937mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
938{
939 MIME_HEADER htmp;
940 int idx;
941 htmp.name = name;
942 idx = sk_MIME_HEADER_find(hdrs, &htmp);
943 if (idx < 0)
944 return NULL;
945 return sk_MIME_HEADER_value(hdrs, idx);
946}
947
948static MIME_PARAM *
949mime_param_find(MIME_HEADER *hdr, char *name)
950{
951 MIME_PARAM param;
952 int idx;
953 param.param_name = name;
954 idx = sk_MIME_PARAM_find(hdr->params, &param);
955 if (idx < 0)
956 return NULL;
957 return sk_MIME_PARAM_value(hdr->params, idx);
958}
959
960static void
961mime_hdr_free(MIME_HEADER *hdr)
962{
963 free(hdr->name);
964 free(hdr->value);
965 if (hdr->params)
966 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
967 free(hdr);
968}
969
970static void
971mime_param_free(MIME_PARAM *param)
972{
973 free(param->param_name);
974 free(param->param_value);
975 free(param);
976}
977
978/* Check for a multipart boundary. Returns:
979 * 0 : no boundary
980 * 1 : part boundary
981 * 2 : final boundary
982 */
983static int
984mime_bound_check(char *line, int linelen, char *bound, int blen)
985{
986 if (linelen == -1)
987 linelen = strlen(line);
988 if (blen == -1)
989 blen = strlen(bound);
990 /* Quickly eliminate if line length too short */
991 if (blen + 2 > linelen)
992 return 0;
993 /* Check for part boundary */
994 if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
995 if (!strncmp(line + blen + 2, "--", 2))
996 return 2;
997 else
998 return 1;
999 }
1000 return 0;
1001}
1002
1003static int
1004strip_eol(char *linebuf, int *plen)
1005{
1006 int len = *plen;
1007 char *p, c;
1008 int is_eol = 0;
1009
1010 for (p = linebuf + len - 1; len > 0; len--, p--) {
1011 c = *p;
1012 if (c == '\n')
1013 is_eol = 1;
1014 else if (c != '\r')
1015 break;
1016 }
1017 *plen = len;
1018 return is_eol;
1019}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-01-05 04:04:55 +0000