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8931b30d 1/* asn_mime.c */
0f113f3e
MC
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
8931b30d
DSH
4 * project.
5 */
6/* ====================================================================
7 * Copyright (c) 1999-2008 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
0f113f3e 14 * notice, this list of conditions and the following disclaimer.
8931b30d
DSH
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 */
55
56#include <stdio.h>
57#include <ctype.h>
b39fc560 58#include "internal/cryptlib.h"
8931b30d
DSH
59#include <openssl/rand.h>
60#include <openssl/x509.h>
61#include <openssl/asn1.h>
62#include <openssl/asn1t.h>
ab0a14bb 63#include "internal/evp_int.h"
8931b30d
DSH
64#include "asn1_locl.h"
65
0f113f3e
MC
66/*
67 * Generalised MIME like utilities for streaming ASN1. Although many have a
68 * PKCS7/CMS like flavour others are more general purpose.
8931b30d
DSH
69 */
70
0f113f3e
MC
71/*
72 * MIME format structures Note that all are translated to lower case apart
73 * from parameter values. Quotes are stripped off
8931b30d
DSH
74 */
75
76typedef struct {
0f113f3e
MC
77 char *param_name; /* Param name e.g. "micalg" */
78 char *param_value; /* Param value e.g. "sha1" */
8931b30d
DSH
79} MIME_PARAM;
80
81DECLARE_STACK_OF(MIME_PARAM)
8931b30d
DSH
82
83typedef struct {
0f113f3e
MC
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 */
8931b30d
DSH
87} MIME_HEADER;
88
89DECLARE_STACK_OF(MIME_HEADER)
8931b30d
DSH
90
91static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
0f113f3e
MC
92 const ASN1_ITEM *it);
93static char *strip_ends(char *name);
94static char *strip_start(char *name);
95static char *strip_end(char *name);
8931b30d
DSH
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);
0f113f3e
MC
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);
8931b30d
DSH
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);
847865d0 106static int strip_eol(char *linebuf, int *plen, int flags);
8931b30d
DSH
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
0f113f3e 112#define mime_debug(x) /* x */
8931b30d
DSH
113
114/* Output an ASN1 structure in BER format streaming if necessary */
115
116int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
0f113f3e
MC
117 const ASN1_ITEM *it)
118{
119 /* If streaming create stream BIO and copy all content through it */
120 if (flags & SMIME_STREAM) {
121 BIO *bio, *tbio;
122 bio = BIO_new_NDEF(out, val, it);
123 if (!bio) {
124 ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
125 return 0;
126 }
127 SMIME_crlf_copy(in, bio, flags);
128 (void)BIO_flush(bio);
129 /* Free up successive BIOs until we hit the old output BIO */
130 do {
131 tbio = BIO_pop(bio);
132 BIO_free(bio);
133 bio = tbio;
134 } while (bio != out);
135 }
136 /*
137 * else just write out ASN1 structure which will have all content stored
138 * internally
139 */
140 else
141 ASN1_item_i2d_bio(it, out, val);
142 return 1;
143}
8931b30d
DSH
144
145/* Base 64 read and write of ASN1 structure */
146
147static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
0f113f3e
MC
148 const ASN1_ITEM *it)
149{
150 BIO *b64;
151 int r;
152 b64 = BIO_new(BIO_f_base64());
90945fa3 153 if (b64 == NULL) {
0f113f3e
MC
154 ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
155 return 0;
156 }
157 /*
158 * prepend the b64 BIO so all data is base64 encoded.
159 */
160 out = BIO_push(b64, out);
161 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
162 (void)BIO_flush(out);
163 BIO_pop(out);
164 BIO_free(b64);
165 return r;
166}
8931b30d
DSH
167
168/* Streaming ASN1 PEM write */
169
170int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
0f113f3e
MC
171 const char *hdr, const ASN1_ITEM *it)
172{
173 int r;
174 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
175 r = B64_write_ASN1(out, val, in, flags, it);
176 BIO_printf(out, "-----END %s-----\n", hdr);
177 return r;
178}
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DSH
179
180static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
181{
0f113f3e
MC
182 BIO *b64;
183 ASN1_VALUE *val;
75ebbd9a
RS
184
185 if ((b64 = BIO_new(BIO_f_base64())) == NULL) {
0f113f3e
MC
186 ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
187 return 0;
188 }
189 bio = BIO_push(b64, bio);
190 val = ASN1_item_d2i_bio(it, bio, NULL);
191 if (!val)
192 ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
193 (void)BIO_flush(bio);
194 bio = BIO_pop(bio);
195 BIO_free(b64);
196 return val;
8931b30d
DSH
197}
198
199/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
200
201static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
0f113f3e
MC
202{
203 const EVP_MD *md;
204 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
205 have_unknown = 0;
206 write_comma = 0;
207 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
208 if (write_comma)
209 BIO_write(out, ",", 1);
210 write_comma = 1;
211 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
212 md = EVP_get_digestbynid(md_nid);
213 if (md && md->md_ctrl) {
214 int rv;
215 char *micstr;
216 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
217 if (rv > 0) {
218 BIO_puts(out, micstr);
219 OPENSSL_free(micstr);
220 continue;
221 }
222 if (rv != -2)
223 goto err;
224 }
225 switch (md_nid) {
226 case NID_sha1:
227 BIO_puts(out, "sha1");
228 break;
229
230 case NID_md5:
231 BIO_puts(out, "md5");
232 break;
233
234 case NID_sha256:
235 BIO_puts(out, "sha-256");
236 break;
237
238 case NID_sha384:
239 BIO_puts(out, "sha-384");
240 break;
241
242 case NID_sha512:
243 BIO_puts(out, "sha-512");
244 break;
245
246 case NID_id_GostR3411_94:
247 BIO_puts(out, "gostr3411-94");
248 goto err;
0f113f3e
MC
249
250 default:
251 if (have_unknown)
252 write_comma = 0;
253 else {
254 BIO_puts(out, "unknown");
255 have_unknown = 1;
256 }
257 break;
258
259 }
260 }
261
262 ret = 1;
263 err:
264
265 return ret;
266
267}
8931b30d
DSH
268
269/* SMIME sender */
270
271int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
0f113f3e
MC
272 int ctype_nid, int econt_nid,
273 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
8931b30d 274{
0f113f3e
MC
275 char bound[33], c;
276 int i;
277 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
278 const char *msg_type = NULL;
279 if (flags & SMIME_OLDMIME)
280 mime_prefix = "application/x-pkcs7-";
281 else
282 mime_prefix = "application/pkcs7-";
283
284 if (flags & SMIME_CRLFEOL)
285 mime_eol = "\r\n";
286 else
287 mime_eol = "\n";
288 if ((flags & SMIME_DETACHED) && data) {
289 /* We want multipart/signed */
290 /* Generate a random boundary */
266483d2
MC
291 if (RAND_bytes((unsigned char *)bound, 32) <= 0)
292 return 0;
0f113f3e
MC
293 for (i = 0; i < 32; i++) {
294 c = bound[i] & 0xf;
295 if (c < 10)
296 c += '0';
297 else
298 c += 'A' - 10;
299 bound[i] = c;
300 }
301 bound[32] = 0;
302 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
303 BIO_printf(bio, "Content-Type: multipart/signed;");
304 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
305 BIO_puts(bio, " micalg=\"");
306 asn1_write_micalg(bio, mdalgs);
307 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
308 bound, mime_eol, mime_eol);
309 BIO_printf(bio, "This is an S/MIME signed message%s%s",
310 mime_eol, mime_eol);
311 /* Now write out the first part */
312 BIO_printf(bio, "------%s%s", bound, mime_eol);
313 if (!asn1_output_data(bio, data, val, flags, it))
314 return 0;
315 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
316
317 /* Headers for signature */
318
319 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
320 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
321 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
322 BIO_printf(bio, "Content-Disposition: attachment;");
323 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
324 B64_write_ASN1(bio, val, NULL, 0, it);
325 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
326 mime_eol, mime_eol);
327 return 1;
328 }
329
330 /* Determine smime-type header */
331
332 if (ctype_nid == NID_pkcs7_enveloped)
333 msg_type = "enveloped-data";
334 else if (ctype_nid == NID_pkcs7_signed) {
335 if (econt_nid == NID_id_smime_ct_receipt)
336 msg_type = "signed-receipt";
337 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
338 msg_type = "signed-data";
339 else
340 msg_type = "certs-only";
341 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
342 msg_type = "compressed-data";
343 cname = "smime.p7z";
344 }
345 /* MIME headers */
346 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
347 BIO_printf(bio, "Content-Disposition: attachment;");
348 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
349 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
350 if (msg_type)
351 BIO_printf(bio, " smime-type=%s;", msg_type);
352 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
353 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
354 mime_eol, mime_eol);
355 if (!B64_write_ASN1(bio, val, data, flags, it))
356 return 0;
357 BIO_printf(bio, "%s", mime_eol);
358 return 1;
8931b30d
DSH
359}
360
361/* Handle output of ASN1 data */
362
8931b30d 363static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
0f113f3e
MC
364 const ASN1_ITEM *it)
365{
366 BIO *tmpbio;
367 const ASN1_AUX *aux = it->funcs;
368 ASN1_STREAM_ARG sarg;
369 int rv = 1;
370
371 /*
372 * If data is not deteched or resigning then the output BIO is already
373 * set up to finalise when it is written through.
374 */
375 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
376 SMIME_crlf_copy(data, out, flags);
377 return 1;
378 }
379
380 if (!aux || !aux->asn1_cb) {
381 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
382 return 0;
383 }
384
385 sarg.out = out;
386 sarg.ndef_bio = NULL;
387 sarg.boundary = NULL;
388
389 /* Let ASN1 code prepend any needed BIOs */
390
391 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
392 return 0;
393
394 /* Copy data across, passing through filter BIOs for processing */
395 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
396
397 /* Finalize structure */
398 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
399 rv = 0;
400
401 /* Now remove any digests prepended to the BIO */
402
403 while (sarg.ndef_bio != out) {
404 tmpbio = BIO_pop(sarg.ndef_bio);
405 BIO_free(sarg.ndef_bio);
406 sarg.ndef_bio = tmpbio;
407 }
408
409 return rv;
410
411}
412
413/*
414 * SMIME reader: handle multipart/signed and opaque signing. in multipart
415 * case the content is placed in a memory BIO pointed to by "bcont". In
416 * opaque this is set to NULL
8931b30d
DSH
417 */
418
2e86f0d8 419ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
8931b30d 420{
0f113f3e
MC
421 BIO *asnin;
422 STACK_OF(MIME_HEADER) *headers = NULL;
423 STACK_OF(BIO) *parts = NULL;
424 MIME_HEADER *hdr;
425 MIME_PARAM *prm;
426 ASN1_VALUE *val;
427 int ret;
428
429 if (bcont)
430 *bcont = NULL;
431
75ebbd9a 432 if ((headers = mime_parse_hdr(bio)) == NULL) {
0f113f3e
MC
433 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
434 return NULL;
435 }
436
75ebbd9a
RS
437 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
438 || hdr->value == NULL) {
0f113f3e
MC
439 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
440 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
441 return NULL;
442 }
443
444 /* Handle multipart/signed */
445
86885c28 446 if (strcmp(hdr->value, "multipart/signed") == 0) {
0f113f3e
MC
447 /* Split into two parts */
448 prm = mime_param_find(hdr, "boundary");
449 if (!prm || !prm->param_value) {
450 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
451 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
452 return NULL;
453 }
454 ret = multi_split(bio, prm->param_value, &parts);
455 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
456 if (!ret || (sk_BIO_num(parts) != 2)) {
457 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
458 sk_BIO_pop_free(parts, BIO_vfree);
459 return NULL;
460 }
461
462 /* Parse the signature piece */
463 asnin = sk_BIO_value(parts, 1);
464
75ebbd9a 465 if ((headers = mime_parse_hdr(asnin)) == NULL) {
0f113f3e
MC
466 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
467 sk_BIO_pop_free(parts, BIO_vfree);
468 return NULL;
469 }
470
471 /* Get content type */
472
75ebbd9a
RS
473 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
474 || hdr->value == NULL) {
0f113f3e
MC
475 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
476 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
477 return NULL;
478 }
479
480 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
481 strcmp(hdr->value, "application/pkcs7-signature")) {
482 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE);
483 ERR_add_error_data(2, "type: ", hdr->value);
484 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
485 sk_BIO_pop_free(parts, BIO_vfree);
486 return NULL;
487 }
488 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
489 /* Read in ASN1 */
75ebbd9a 490 if ((val = b64_read_asn1(asnin, it)) == NULL) {
0f113f3e
MC
491 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
492 sk_BIO_pop_free(parts, BIO_vfree);
493 return NULL;
494 }
495
496 if (bcont) {
497 *bcont = sk_BIO_value(parts, 0);
498 BIO_free(asnin);
499 sk_BIO_free(parts);
500 } else
501 sk_BIO_pop_free(parts, BIO_vfree);
502 return val;
503 }
504
505 /* OK, if not multipart/signed try opaque signature */
506
507 if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
508 strcmp(hdr->value, "application/pkcs7-mime")) {
509 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
510 ERR_add_error_data(2, "type: ", hdr->value);
511 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
512 return NULL;
513 }
514
515 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
516
75ebbd9a 517 if ((val = b64_read_asn1(bio, it)) == NULL) {
0f113f3e
MC
518 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
519 return NULL;
520 }
521 return val;
8931b30d
DSH
522
523}
524
525/* Copy text from one BIO to another making the output CRLF at EOL */
526int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
527{
0f113f3e
MC
528 BIO *bf;
529 char eol;
530 int len;
531 char linebuf[MAX_SMLEN];
532 /*
533 * Buffer output so we don't write one line at a time. This is useful
534 * when streaming as we don't end up with one OCTET STRING per line.
535 */
536 bf = BIO_new(BIO_f_buffer());
90945fa3 537 if (bf == NULL)
0f113f3e
MC
538 return 0;
539 out = BIO_push(bf, out);
540 if (flags & SMIME_BINARY) {
541 while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
542 BIO_write(out, linebuf, len);
543 } else {
544 int eolcnt = 0;
545 if (flags & SMIME_TEXT)
546 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
547 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
548 eol = strip_eol(linebuf, &len, flags);
549 if (len) {
550 /* Not EOF: write out all CRLF */
551 if (flags & SMIME_ASCIICRLF) {
552 int i;
553 for (i = 0; i < eolcnt; i++)
554 BIO_write(out, "\r\n", 2);
555 eolcnt = 0;
556 }
557 BIO_write(out, linebuf, len);
558 if (eol)
559 BIO_write(out, "\r\n", 2);
560 } else if (flags & SMIME_ASCIICRLF)
561 eolcnt++;
562 else if (eol)
563 BIO_write(out, "\r\n", 2);
564 }
565 }
566 (void)BIO_flush(out);
567 BIO_pop(out);
568 BIO_free(bf);
569 return 1;
8931b30d
DSH
570}
571
572/* Strip off headers if they are text/plain */
573int SMIME_text(BIO *in, BIO *out)
574{
0f113f3e
MC
575 char iobuf[4096];
576 int len;
577 STACK_OF(MIME_HEADER) *headers;
578 MIME_HEADER *hdr;
579
75ebbd9a 580 if ((headers = mime_parse_hdr(in)) == NULL) {
0f113f3e
MC
581 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
582 return 0;
583 }
75ebbd9a
RS
584 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
585 || hdr->value == NULL) {
0f113f3e
MC
586 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
587 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
588 return 0;
589 }
590 if (strcmp(hdr->value, "text/plain")) {
591 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
592 ERR_add_error_data(2, "type: ", hdr->value);
593 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
594 return 0;
595 }
596 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
597 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
598 BIO_write(out, iobuf, len);
599 if (len < 0)
600 return 0;
601 return 1;
8931b30d
DSH
602}
603
0f113f3e
MC
604/*
605 * Split a multipart/XXX message body into component parts: result is
8931b30d
DSH
606 * canonical parts in a STACK of bios
607 */
608
609static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
610{
0f113f3e
MC
611 char linebuf[MAX_SMLEN];
612 int len, blen;
613 int eol = 0, next_eol = 0;
614 BIO *bpart = NULL;
615 STACK_OF(BIO) *parts;
616 char state, part, first;
617
618 blen = strlen(bound);
619 part = 0;
620 state = 0;
621 first = 1;
622 parts = sk_BIO_new_null();
623 *ret = parts;
624 if (*ret == NULL)
625 return 0;
626 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
627 state = mime_bound_check(linebuf, len, bound, blen);
628 if (state == 1) {
629 first = 1;
630 part++;
631 } else if (state == 2) {
632 if (!sk_BIO_push(parts, bpart)) {
633 BIO_free(bpart);
634 return 0;
635 }
636 return 1;
637 } else if (part) {
638 /* Strip CR+LF from linebuf */
639 next_eol = strip_eol(linebuf, &len, 0);
640 if (first) {
641 first = 0;
642 if (bpart)
643 if (!sk_BIO_push(parts, bpart)) {
644 BIO_free(bpart);
645 return 0;
646 }
647 bpart = BIO_new(BIO_s_mem());
648 if (bpart == NULL)
649 return 0;
650 BIO_set_mem_eof_return(bpart, 0);
651 } else if (eol)
652 BIO_write(bpart, "\r\n", 2);
653 eol = next_eol;
654 if (len)
655 BIO_write(bpart, linebuf, len);
656 }
657 }
ca3a82c3 658 BIO_free(bpart);
0f113f3e 659 return 0;
8931b30d
DSH
660}
661
662/* This is the big one: parse MIME header lines up to message body */
663
0f113f3e
MC
664#define MIME_INVALID 0
665#define MIME_START 1
666#define MIME_TYPE 2
667#define MIME_NAME 3
668#define MIME_VALUE 4
669#define MIME_QUOTE 5
670#define MIME_COMMENT 6
8931b30d
DSH
671
672static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
673{
0f113f3e
MC
674 char *p, *q, c;
675 char *ntmp;
676 char linebuf[MAX_SMLEN];
677 MIME_HEADER *mhdr = NULL;
678 STACK_OF(MIME_HEADER) *headers;
679 int len, state, save_state = 0;
680
681 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
90945fa3 682 if (headers == NULL)
0f113f3e
MC
683 return NULL;
684 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
685 /* If whitespace at line start then continuation line */
686 if (mhdr && isspace((unsigned char)linebuf[0]))
687 state = MIME_NAME;
688 else
689 state = MIME_START;
690 ntmp = NULL;
691 /* Go through all characters */
692 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
693 p++) {
694
695 /*
696 * State machine to handle MIME headers if this looks horrible
697 * that's because it *is*
698 */
699
700 switch (state) {
701 case MIME_START:
702 if (c == ':') {
703 state = MIME_TYPE;
704 *p = 0;
705 ntmp = strip_ends(q);
706 q = p + 1;
707 }
708 break;
709
710 case MIME_TYPE:
711 if (c == ';') {
712 mime_debug("Found End Value\n");
713 *p = 0;
714 mhdr = mime_hdr_new(ntmp, strip_ends(q));
715 sk_MIME_HEADER_push(headers, mhdr);
716 ntmp = NULL;
717 q = p + 1;
718 state = MIME_NAME;
719 } else if (c == '(') {
720 save_state = state;
721 state = MIME_COMMENT;
722 }
723 break;
724
725 case MIME_COMMENT:
726 if (c == ')') {
727 state = save_state;
728 }
729 break;
730
731 case MIME_NAME:
732 if (c == '=') {
733 state = MIME_VALUE;
734 *p = 0;
735 ntmp = strip_ends(q);
736 q = p + 1;
737 }
738 break;
739
740 case MIME_VALUE:
741 if (c == ';') {
742 state = MIME_NAME;
743 *p = 0;
744 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
745 ntmp = NULL;
746 q = p + 1;
747 } else if (c == '"') {
748 mime_debug("Found Quote\n");
749 state = MIME_QUOTE;
750 } else if (c == '(') {
751 save_state = state;
752 state = MIME_COMMENT;
753 }
754 break;
755
756 case MIME_QUOTE:
757 if (c == '"') {
758 mime_debug("Found Match Quote\n");
759 state = MIME_VALUE;
760 }
761 break;
762 }
763 }
764
765 if (state == MIME_TYPE) {
766 mhdr = mime_hdr_new(ntmp, strip_ends(q));
767 sk_MIME_HEADER_push(headers, mhdr);
768 } else if (state == MIME_VALUE)
769 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
770 if (p == linebuf)
771 break; /* Blank line means end of headers */
772 }
773
774 return headers;
8931b30d
DSH
775
776}
777
778static char *strip_ends(char *name)
779{
0f113f3e 780 return strip_end(strip_start(name));
8931b30d
DSH
781}
782
783/* Strip a parameter of whitespace from start of param */
784static char *strip_start(char *name)
785{
0f113f3e
MC
786 char *p, c;
787 /* Look for first non white space or quote */
788 for (p = name; (c = *p); p++) {
789 if (c == '"') {
790 /* Next char is start of string if non null */
791 if (p[1])
792 return p + 1;
793 /* Else null string */
794 return NULL;
795 }
796 if (!isspace((unsigned char)c))
797 return p;
798 }
799 return NULL;
8931b30d
DSH
800}
801
802/* As above but strip from end of string : maybe should handle brackets? */
803static char *strip_end(char *name)
804{
0f113f3e
MC
805 char *p, c;
806 if (!name)
807 return NULL;
808 /* Look for first non white space or quote */
809 for (p = name + strlen(name) - 1; p >= name; p--) {
810 c = *p;
811 if (c == '"') {
812 if (p - 1 == name)
813 return NULL;
814 *p = 0;
815 return name;
816 }
817 if (isspace((unsigned char)c))
818 *p = 0;
819 else
820 return name;
821 }
822 return NULL;
8931b30d
DSH
823}
824
825static MIME_HEADER *mime_hdr_new(char *name, char *value)
826{
0f113f3e
MC
827 MIME_HEADER *mhdr = NULL;
828 char *tmpname = NULL, *tmpval = NULL, *p;
829 int c;
75ebbd9a 830
0f113f3e 831 if (name) {
7644a9ae 832 if ((tmpname = OPENSSL_strdup(name)) == NULL)
0f113f3e
MC
833 return NULL;
834 for (p = tmpname; *p; p++) {
835 c = (unsigned char)*p;
836 if (isupper(c)) {
837 c = tolower(c);
838 *p = c;
839 }
840 }
841 }
842 if (value) {
7644a9ae 843 if ((tmpval = OPENSSL_strdup(value)) == NULL)
0f113f3e
MC
844 goto err;
845 for (p = tmpval; *p; p++) {
846 c = (unsigned char)*p;
847 if (isupper(c)) {
848 c = tolower(c);
849 *p = c;
850 }
851 }
852 }
b4faea50 853 mhdr = OPENSSL_malloc(sizeof(*mhdr));
90945fa3 854 if (mhdr == NULL)
0f113f3e
MC
855 goto err;
856 mhdr->name = tmpname;
857 mhdr->value = tmpval;
75ebbd9a 858 if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
0f113f3e
MC
859 goto err;
860 return mhdr;
861
862 err:
b548a1f1
RS
863 OPENSSL_free(tmpname);
864 OPENSSL_free(tmpval);
865 OPENSSL_free(mhdr);
0f113f3e 866 return NULL;
8931b30d 867}
0f113f3e 868
8931b30d
DSH
869static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
870{
0f113f3e
MC
871 char *tmpname = NULL, *tmpval = NULL, *p;
872 int c;
873 MIME_PARAM *mparam = NULL;
874 if (name) {
7644a9ae 875 tmpname = OPENSSL_strdup(name);
0f113f3e
MC
876 if (!tmpname)
877 goto err;
878 for (p = tmpname; *p; p++) {
879 c = (unsigned char)*p;
880 if (isupper(c)) {
881 c = tolower(c);
882 *p = c;
883 }
884 }
885 }
886 if (value) {
7644a9ae 887 tmpval = OPENSSL_strdup(value);
0f113f3e
MC
888 if (!tmpval)
889 goto err;
890 }
891 /* Parameter values are case sensitive so leave as is */
b4faea50 892 mparam = OPENSSL_malloc(sizeof(*mparam));
90945fa3 893 if (mparam == NULL)
0f113f3e
MC
894 goto err;
895 mparam->param_name = tmpname;
896 mparam->param_value = tmpval;
897 if (!sk_MIME_PARAM_push(mhdr->params, mparam))
898 goto err;
899 return 1;
900 err:
b548a1f1
RS
901 OPENSSL_free(tmpname);
902 OPENSSL_free(tmpval);
903 OPENSSL_free(mparam);
0f113f3e 904 return 0;
8931b30d
DSH
905}
906
0f113f3e
MC
907static int mime_hdr_cmp(const MIME_HEADER *const *a,
908 const MIME_HEADER *const *b)
8931b30d 909{
0f113f3e
MC
910 if (!(*a)->name || !(*b)->name)
911 return ! !(*a)->name - ! !(*b)->name;
6941b7b9 912
0f113f3e 913 return (strcmp((*a)->name, (*b)->name));
8931b30d
DSH
914}
915
0f113f3e
MC
916static int mime_param_cmp(const MIME_PARAM *const *a,
917 const MIME_PARAM *const *b)
8931b30d 918{
0f113f3e
MC
919 if (!(*a)->param_name || !(*b)->param_name)
920 return ! !(*a)->param_name - ! !(*b)->param_name;
921 return (strcmp((*a)->param_name, (*b)->param_name));
8931b30d
DSH
922}
923
924/* Find a header with a given name (if possible) */
925
926static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
927{
0f113f3e
MC
928 MIME_HEADER htmp;
929 int idx;
930 htmp.name = name;
931 idx = sk_MIME_HEADER_find(hdrs, &htmp);
932 if (idx < 0)
933 return NULL;
934 return sk_MIME_HEADER_value(hdrs, idx);
8931b30d
DSH
935}
936
937static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
938{
0f113f3e
MC
939 MIME_PARAM param;
940 int idx;
941 param.param_name = name;
942 idx = sk_MIME_PARAM_find(hdr->params, &param);
943 if (idx < 0)
944 return NULL;
945 return sk_MIME_PARAM_value(hdr->params, idx);
8931b30d
DSH
946}
947
948static void mime_hdr_free(MIME_HEADER *hdr)
949{
b548a1f1
RS
950 OPENSSL_free(hdr->name);
951 OPENSSL_free(hdr->value);
0f113f3e
MC
952 if (hdr->params)
953 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
954 OPENSSL_free(hdr);
8931b30d
DSH
955}
956
957static void mime_param_free(MIME_PARAM *param)
958{
b548a1f1
RS
959 OPENSSL_free(param->param_name);
960 OPENSSL_free(param->param_value);
0f113f3e 961 OPENSSL_free(param);
8931b30d
DSH
962}
963
c80fd6b2
MC
964/*-
965 * Check for a multipart boundary. Returns:
8931b30d
DSH
966 * 0 : no boundary
967 * 1 : part boundary
968 * 2 : final boundary
969 */
970static int mime_bound_check(char *line, int linelen, char *bound, int blen)
971{
0f113f3e
MC
972 if (linelen == -1)
973 linelen = strlen(line);
974 if (blen == -1)
975 blen = strlen(bound);
976 /* Quickly eliminate if line length too short */
977 if (blen + 2 > linelen)
978 return 0;
979 /* Check for part boundary */
86885c28
RS
980 if ((strncmp(line, "--", 2) == 0)
981 && strncmp(line + 2, bound, blen) == 0) {
982 if (strncmp(line + blen + 2, "--", 2) == 0)
0f113f3e
MC
983 return 2;
984 else
985 return 1;
986 }
987 return 0;
8931b30d
DSH
988}
989
847865d0 990static int strip_eol(char *linebuf, int *plen, int flags)
0f113f3e
MC
991{
992 int len = *plen;
993 char *p, c;
994 int is_eol = 0;
995 p = linebuf + len - 1;
996 for (p = linebuf + len - 1; len > 0; len--, p--) {
997 c = *p;
998 if (c == '\n')
999 is_eol = 1;
1000 else if (is_eol && flags & SMIME_ASCIICRLF && c < 33)
1001 continue;
1002 else if (c != '\r')
1003 break;
1004 }
1005 *plen = len;
1006 return is_eol;
1007}