Line data Source code
1 : /* asn_mime.c */
2 : /*
3 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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
14 : * notice, this list of conditions and the following disclaimer.
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>
58 : #include "cryptlib.h"
59 : #include <openssl/rand.h>
60 : #include <openssl/x509.h>
61 : #include <openssl/asn1.h>
62 : #include <openssl/asn1t.h>
63 : #include "asn1_locl.h"
64 :
65 : /*
66 : * Generalised MIME like utilities for streaming ASN1. Although many have a
67 : * PKCS7/CMS like flavour others are more general purpose.
68 : */
69 :
70 : /*
71 : * MIME format structures Note that all are translated to lower case apart
72 : * from parameter values. Quotes are stripped off
73 : */
74 :
75 : typedef struct {
76 : char *param_name; /* Param name e.g. "micalg" */
77 : char *param_value; /* Param value e.g. "sha1" */
78 : } MIME_PARAM;
79 :
80 : DECLARE_STACK_OF(MIME_PARAM)
81 : IMPLEMENT_STACK_OF(MIME_PARAM)
82 :
83 : typedef 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 :
89 : DECLARE_STACK_OF(MIME_HEADER)
90 : IMPLEMENT_STACK_OF(MIME_HEADER)
91 :
92 : static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
93 : const ASN1_ITEM *it);
94 : static char *strip_ends(char *name);
95 : static char *strip_start(char *name);
96 : static char *strip_end(char *name);
97 : static MIME_HEADER *mime_hdr_new(char *name, char *value);
98 : static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
99 : static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
100 : static int mime_hdr_cmp(const MIME_HEADER *const *a,
101 : const MIME_HEADER *const *b);
102 : static int mime_param_cmp(const MIME_PARAM *const *a,
103 : const MIME_PARAM *const *b);
104 : static void mime_param_free(MIME_PARAM *param);
105 : static int mime_bound_check(char *line, int linelen, char *bound, int blen);
106 : static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
107 : static int strip_eol(char *linebuf, int *plen);
108 : static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
109 : static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
110 : static void mime_hdr_free(MIME_HEADER *hdr);
111 :
112 : #define MAX_SMLEN 1024
113 : #define mime_debug(x) /* x */
114 :
115 : /* Output an ASN1 structure in BER format streaming if necessary */
116 :
117 0 : int i2d_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 0 : if (flags & SMIME_STREAM) {
122 : BIO *bio, *tbio;
123 0 : bio = BIO_new_NDEF(out, val, it);
124 0 : if (!bio) {
125 0 : ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
126 0 : return 0;
127 : }
128 0 : SMIME_crlf_copy(in, bio, flags);
129 0 : (void)BIO_flush(bio);
130 : /* Free up successive BIOs until we hit the old output BIO */
131 : do {
132 0 : tbio = BIO_pop(bio);
133 0 : BIO_free(bio);
134 : bio = tbio;
135 0 : } while (bio != out);
136 : }
137 : /*
138 : * else just write out ASN1 structure which will have all content stored
139 : * internally
140 : */
141 : else
142 0 : ASN1_item_i2d_bio(it, out, val);
143 : return 1;
144 : }
145 :
146 : /* Base 64 read and write of ASN1 structure */
147 :
148 0 : static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
149 : const ASN1_ITEM *it)
150 : {
151 : BIO *b64;
152 : int r;
153 0 : b64 = BIO_new(BIO_f_base64());
154 0 : if (!b64) {
155 0 : ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
156 0 : return 0;
157 : }
158 : /*
159 : * prepend the b64 BIO so all data is base64 encoded.
160 : */
161 0 : out = BIO_push(b64, out);
162 0 : r = i2d_ASN1_bio_stream(out, val, in, flags, it);
163 0 : (void)BIO_flush(out);
164 0 : BIO_pop(out);
165 0 : BIO_free(b64);
166 0 : return r;
167 : }
168 :
169 : /* Streaming ASN1 PEM write */
170 :
171 0 : int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
172 : const char *hdr, const ASN1_ITEM *it)
173 : {
174 : int r;
175 0 : BIO_printf(out, "-----BEGIN %s-----\n", hdr);
176 0 : r = B64_write_ASN1(out, val, in, flags, it);
177 0 : BIO_printf(out, "-----END %s-----\n", hdr);
178 0 : return r;
179 : }
180 :
181 0 : static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
182 : {
183 : BIO *b64;
184 : ASN1_VALUE *val;
185 0 : if (!(b64 = BIO_new(BIO_f_base64()))) {
186 0 : ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
187 0 : return 0;
188 : }
189 0 : bio = BIO_push(b64, bio);
190 0 : val = ASN1_item_d2i_bio(it, bio, NULL);
191 0 : if (!val)
192 0 : ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
193 0 : (void)BIO_flush(bio);
194 0 : bio = BIO_pop(bio);
195 0 : BIO_free(b64);
196 0 : return val;
197 : }
198 :
199 : /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
200 :
201 0 : static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
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 0 : for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
208 0 : if (write_comma)
209 0 : BIO_write(out, ",", 1);
210 : write_comma = 1;
211 0 : md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
212 0 : md = EVP_get_digestbynid(md_nid);
213 0 : if (md && md->md_ctrl) {
214 : int rv;
215 : char *micstr;
216 0 : rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
217 0 : if (rv > 0) {
218 0 : BIO_puts(out, micstr);
219 0 : OPENSSL_free(micstr);
220 0 : continue;
221 : }
222 0 : if (rv != -2)
223 : goto err;
224 : }
225 0 : switch (md_nid) {
226 : case NID_sha1:
227 0 : BIO_puts(out, "sha1");
228 0 : break;
229 :
230 : case NID_md5:
231 0 : BIO_puts(out, "md5");
232 0 : break;
233 :
234 : case NID_sha256:
235 0 : BIO_puts(out, "sha-256");
236 0 : break;
237 :
238 : case NID_sha384:
239 0 : BIO_puts(out, "sha-384");
240 0 : break;
241 :
242 : case NID_sha512:
243 0 : BIO_puts(out, "sha-512");
244 0 : break;
245 :
246 : case NID_id_GostR3411_94:
247 0 : BIO_puts(out, "gostr3411-94");
248 0 : goto err;
249 : break;
250 :
251 : default:
252 0 : if (have_unknown)
253 : write_comma = 0;
254 : else {
255 0 : BIO_puts(out, "unknown");
256 : have_unknown = 1;
257 : }
258 : break;
259 :
260 : }
261 : }
262 :
263 : ret = 1;
264 : err:
265 :
266 0 : return ret;
267 :
268 : }
269 :
270 : /* SMIME sender */
271 :
272 0 : int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
273 : int ctype_nid, int econt_nid,
274 : STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
275 : {
276 : char bound[33], c;
277 : int i;
278 : const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
279 : const char *msg_type = NULL;
280 0 : if (flags & SMIME_OLDMIME)
281 : mime_prefix = "application/x-pkcs7-";
282 : else
283 : mime_prefix = "application/pkcs7-";
284 :
285 0 : if (flags & SMIME_CRLFEOL)
286 : mime_eol = "\r\n";
287 : else
288 : mime_eol = "\n";
289 0 : if ((flags & SMIME_DETACHED) && data) {
290 : /* We want multipart/signed */
291 : /* Generate a random boundary */
292 0 : if (RAND_pseudo_bytes((unsigned char *)bound, 32) < 0)
293 : return 0;
294 0 : for (i = 0; i < 32; i++) {
295 0 : c = bound[i] & 0xf;
296 0 : if (c < 10)
297 0 : c += '0';
298 : else
299 0 : c += 'A' - 10;
300 0 : bound[i] = c;
301 : }
302 0 : bound[32] = 0;
303 0 : BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
304 0 : BIO_printf(bio, "Content-Type: multipart/signed;");
305 0 : BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
306 0 : BIO_puts(bio, " micalg=\"");
307 0 : asn1_write_micalg(bio, mdalgs);
308 0 : BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
309 : bound, mime_eol, mime_eol);
310 0 : BIO_printf(bio, "This is an S/MIME signed message%s%s",
311 : mime_eol, mime_eol);
312 : /* Now write out the first part */
313 0 : BIO_printf(bio, "------%s%s", bound, mime_eol);
314 0 : if (!asn1_output_data(bio, data, val, flags, it))
315 : return 0;
316 0 : BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
317 :
318 : /* Headers for signature */
319 :
320 0 : BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
321 0 : BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
322 0 : BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
323 0 : BIO_printf(bio, "Content-Disposition: attachment;");
324 0 : BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
325 0 : B64_write_ASN1(bio, val, NULL, 0, it);
326 0 : BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
327 : mime_eol, mime_eol);
328 0 : return 1;
329 : }
330 :
331 : /* Determine smime-type header */
332 :
333 0 : if (ctype_nid == NID_pkcs7_enveloped)
334 : msg_type = "enveloped-data";
335 0 : else if (ctype_nid == NID_pkcs7_signed) {
336 0 : if (econt_nid == NID_id_smime_ct_receipt)
337 : msg_type = "signed-receipt";
338 0 : else if (sk_X509_ALGOR_num(mdalgs) >= 0)
339 : msg_type = "signed-data";
340 : else
341 : msg_type = "certs-only";
342 0 : } else if (ctype_nid == NID_id_smime_ct_compressedData) {
343 : msg_type = "compressed-data";
344 : cname = "smime.p7z";
345 : }
346 : /* MIME headers */
347 0 : BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
348 0 : BIO_printf(bio, "Content-Disposition: attachment;");
349 0 : BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
350 0 : BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
351 0 : if (msg_type)
352 0 : BIO_printf(bio, " smime-type=%s;", msg_type);
353 0 : BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
354 0 : BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
355 : mime_eol, mime_eol);
356 0 : if (!B64_write_ASN1(bio, val, data, flags, it))
357 : return 0;
358 0 : BIO_printf(bio, "%s", mime_eol);
359 0 : return 1;
360 : }
361 :
362 : /* Handle output of ASN1 data */
363 :
364 0 : static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
365 : const ASN1_ITEM *it)
366 : {
367 : BIO *tmpbio;
368 0 : const ASN1_AUX *aux = it->funcs;
369 : ASN1_STREAM_ARG sarg;
370 : int rv = 1;
371 :
372 : /*
373 : * If data is not deteched or resigning then the output BIO is already
374 : * set up to finalise when it is written through.
375 : */
376 0 : if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
377 0 : SMIME_crlf_copy(data, out, flags);
378 0 : return 1;
379 : }
380 :
381 0 : if (!aux || !aux->asn1_cb) {
382 0 : ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
383 0 : return 0;
384 : }
385 :
386 0 : sarg.out = out;
387 0 : sarg.ndef_bio = NULL;
388 0 : sarg.boundary = NULL;
389 :
390 : /* Let ASN1 code prepend any needed BIOs */
391 :
392 0 : if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
393 : return 0;
394 :
395 : /* Copy data across, passing through filter BIOs for processing */
396 0 : SMIME_crlf_copy(data, sarg.ndef_bio, flags);
397 :
398 : /* Finalize structure */
399 0 : if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
400 : rv = 0;
401 :
402 : /* Now remove any digests prepended to the BIO */
403 :
404 0 : while (sarg.ndef_bio != out) {
405 0 : tmpbio = BIO_pop(sarg.ndef_bio);
406 0 : BIO_free(sarg.ndef_bio);
407 0 : sarg.ndef_bio = tmpbio;
408 : }
409 :
410 : return rv;
411 :
412 : }
413 :
414 : /*
415 : * SMIME reader: handle multipart/signed and opaque signing. in multipart
416 : * case the content is placed in a memory BIO pointed to by "bcont". In
417 : * opaque this is set to NULL
418 : */
419 :
420 0 : ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
421 : {
422 : BIO *asnin;
423 : STACK_OF(MIME_HEADER) *headers = NULL;
424 0 : STACK_OF(BIO) *parts = NULL;
425 : MIME_HEADER *hdr;
426 : MIME_PARAM *prm;
427 : ASN1_VALUE *val;
428 : int ret;
429 :
430 0 : if (bcont)
431 0 : *bcont = NULL;
432 :
433 0 : if (!(headers = mime_parse_hdr(bio))) {
434 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
435 0 : return NULL;
436 : }
437 :
438 0 : if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
439 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
440 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
441 0 : return NULL;
442 : }
443 :
444 : /* Handle multipart/signed */
445 :
446 0 : if (!strcmp(hdr->value, "multipart/signed")) {
447 : /* Split into two parts */
448 0 : prm = mime_param_find(hdr, "boundary");
449 0 : if (!prm || !prm->param_value) {
450 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
451 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
452 0 : return NULL;
453 : }
454 0 : ret = multi_split(bio, prm->param_value, &parts);
455 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
456 0 : if (!ret || (sk_BIO_num(parts) != 2)) {
457 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
458 0 : sk_BIO_pop_free(parts, BIO_vfree);
459 0 : return NULL;
460 : }
461 :
462 : /* Parse the signature piece */
463 0 : asnin = sk_BIO_value(parts, 1);
464 :
465 0 : if (!(headers = mime_parse_hdr(asnin))) {
466 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
467 0 : sk_BIO_pop_free(parts, BIO_vfree);
468 0 : return NULL;
469 : }
470 :
471 : /* Get content type */
472 :
473 0 : if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
474 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
475 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
476 0 : return NULL;
477 : }
478 :
479 0 : if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
480 0 : strcmp(hdr->value, "application/pkcs7-signature")) {
481 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE);
482 0 : ERR_add_error_data(2, "type: ", hdr->value);
483 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
484 0 : sk_BIO_pop_free(parts, BIO_vfree);
485 0 : return NULL;
486 : }
487 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
488 : /* Read in ASN1 */
489 0 : if (!(val = b64_read_asn1(asnin, it))) {
490 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
491 0 : sk_BIO_pop_free(parts, BIO_vfree);
492 0 : return NULL;
493 : }
494 :
495 0 : if (bcont) {
496 0 : *bcont = sk_BIO_value(parts, 0);
497 0 : BIO_free(asnin);
498 0 : sk_BIO_free(parts);
499 : } else
500 0 : sk_BIO_pop_free(parts, BIO_vfree);
501 0 : return val;
502 : }
503 :
504 : /* OK, if not multipart/signed try opaque signature */
505 :
506 0 : if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
507 0 : strcmp(hdr->value, "application/pkcs7-mime")) {
508 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
509 0 : ERR_add_error_data(2, "type: ", hdr->value);
510 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
511 0 : return NULL;
512 : }
513 :
514 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
515 :
516 0 : if (!(val = b64_read_asn1(bio, it))) {
517 0 : ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
518 0 : return NULL;
519 : }
520 : return val;
521 :
522 : }
523 :
524 : /* Copy text from one BIO to another making the output CRLF at EOL */
525 0 : int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
526 : {
527 : BIO *bf;
528 : char eol;
529 : int len;
530 : char linebuf[MAX_SMLEN];
531 : /*
532 : * Buffer output so we don't write one line at a time. This is useful
533 : * when streaming as we don't end up with one OCTET STRING per line.
534 : */
535 0 : bf = BIO_new(BIO_f_buffer());
536 0 : if (!bf)
537 : return 0;
538 0 : out = BIO_push(bf, out);
539 0 : if (flags & SMIME_BINARY) {
540 0 : while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
541 0 : BIO_write(out, linebuf, len);
542 : } else {
543 0 : if (flags & SMIME_TEXT)
544 0 : BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
545 0 : while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
546 0 : eol = strip_eol(linebuf, &len);
547 0 : if (len)
548 0 : BIO_write(out, linebuf, len);
549 0 : if (eol)
550 0 : BIO_write(out, "\r\n", 2);
551 : }
552 : }
553 0 : (void)BIO_flush(out);
554 0 : BIO_pop(out);
555 0 : BIO_free(bf);
556 0 : return 1;
557 : }
558 :
559 : /* Strip off headers if they are text/plain */
560 0 : int SMIME_text(BIO *in, BIO *out)
561 : {
562 : char iobuf[4096];
563 : int len;
564 : STACK_OF(MIME_HEADER) *headers;
565 : MIME_HEADER *hdr;
566 :
567 0 : if (!(headers = mime_parse_hdr(in))) {
568 0 : ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
569 0 : return 0;
570 : }
571 0 : if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
572 0 : ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
573 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
574 0 : return 0;
575 : }
576 0 : if (strcmp(hdr->value, "text/plain")) {
577 0 : ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
578 0 : ERR_add_error_data(2, "type: ", hdr->value);
579 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
580 0 : return 0;
581 : }
582 0 : sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
583 0 : while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
584 0 : BIO_write(out, iobuf, len);
585 0 : if (len < 0)
586 : return 0;
587 0 : return 1;
588 : }
589 :
590 : /*
591 : * Split a multipart/XXX message body into component parts: result is
592 : * canonical parts in a STACK of bios
593 : */
594 :
595 0 : static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
596 : {
597 : char linebuf[MAX_SMLEN];
598 : int len, blen;
599 : int eol = 0, next_eol = 0;
600 : BIO *bpart = NULL;
601 : STACK_OF(BIO) *parts;
602 : char state, part, first;
603 :
604 0 : blen = strlen(bound);
605 : part = 0;
606 : state = 0;
607 : first = 1;
608 0 : parts = sk_BIO_new_null();
609 0 : *ret = parts;
610 0 : while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
611 0 : state = mime_bound_check(linebuf, len, bound, blen);
612 0 : if (state == 1) {
613 : first = 1;
614 0 : part++;
615 0 : } else if (state == 2) {
616 0 : sk_BIO_push(parts, bpart);
617 0 : return 1;
618 0 : } else if (part) {
619 : /* Strip CR+LF from linebuf */
620 : next_eol = strip_eol(linebuf, &len);
621 0 : if (first) {
622 : first = 0;
623 0 : if (bpart)
624 0 : sk_BIO_push(parts, bpart);
625 0 : bpart = BIO_new(BIO_s_mem());
626 0 : BIO_set_mem_eof_return(bpart, 0);
627 0 : } else if (eol)
628 0 : BIO_write(bpart, "\r\n", 2);
629 : eol = next_eol;
630 0 : if (len)
631 0 : BIO_write(bpart, linebuf, len);
632 : }
633 : }
634 : return 0;
635 : }
636 :
637 : /* This is the big one: parse MIME header lines up to message body */
638 :
639 : #define MIME_INVALID 0
640 : #define MIME_START 1
641 : #define MIME_TYPE 2
642 : #define MIME_NAME 3
643 : #define MIME_VALUE 4
644 : #define MIME_QUOTE 5
645 : #define MIME_COMMENT 6
646 :
647 0 : static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
648 : {
649 : char *p, *q, c;
650 : char *ntmp;
651 : char linebuf[MAX_SMLEN];
652 : MIME_HEADER *mhdr = NULL;
653 : STACK_OF(MIME_HEADER) *headers;
654 : int len, state, save_state = 0;
655 :
656 0 : headers = sk_MIME_HEADER_new(mime_hdr_cmp);
657 0 : if (!headers)
658 : return NULL;
659 0 : while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
660 : /* If whitespace at line start then continuation line */
661 0 : if (mhdr && isspace((unsigned char)linebuf[0]))
662 : state = MIME_NAME;
663 : else
664 : state = MIME_START;
665 : ntmp = NULL;
666 : /* Go through all characters */
667 0 : for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
668 0 : p++) {
669 :
670 : /*
671 : * State machine to handle MIME headers if this looks horrible
672 : * that's because it *is*
673 : */
674 :
675 0 : switch (state) {
676 : case MIME_START:
677 0 : if (c == ':') {
678 : state = MIME_TYPE;
679 0 : *p = 0;
680 : ntmp = strip_ends(q);
681 0 : q = p + 1;
682 : }
683 : break;
684 :
685 : case MIME_TYPE:
686 0 : if (c == ';') {
687 : mime_debug("Found End Value\n");
688 0 : *p = 0;
689 0 : mhdr = mime_hdr_new(ntmp, strip_ends(q));
690 0 : sk_MIME_HEADER_push(headers, mhdr);
691 : ntmp = NULL;
692 0 : q = p + 1;
693 : state = MIME_NAME;
694 0 : } else if (c == '(') {
695 : save_state = state;
696 : state = MIME_COMMENT;
697 : }
698 : break;
699 :
700 : case MIME_COMMENT:
701 0 : if (c == ')') {
702 : state = save_state;
703 : }
704 : break;
705 :
706 : case MIME_NAME:
707 0 : if (c == '=') {
708 : state = MIME_VALUE;
709 0 : *p = 0;
710 : ntmp = strip_ends(q);
711 0 : q = p + 1;
712 : }
713 : break;
714 :
715 : case MIME_VALUE:
716 0 : if (c == ';') {
717 : state = MIME_NAME;
718 0 : *p = 0;
719 0 : mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
720 : ntmp = NULL;
721 0 : q = p + 1;
722 0 : } else if (c == '"') {
723 : mime_debug("Found Quote\n");
724 : state = MIME_QUOTE;
725 0 : } else if (c == '(') {
726 : save_state = state;
727 : state = MIME_COMMENT;
728 : }
729 : break;
730 :
731 : case MIME_QUOTE:
732 0 : if (c == '"') {
733 : mime_debug("Found Match Quote\n");
734 : state = MIME_VALUE;
735 : }
736 : break;
737 : }
738 : }
739 :
740 0 : if (state == MIME_TYPE) {
741 0 : mhdr = mime_hdr_new(ntmp, strip_ends(q));
742 0 : sk_MIME_HEADER_push(headers, mhdr);
743 0 : } else if (state == MIME_VALUE)
744 0 : mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
745 0 : if (p == linebuf)
746 : break; /* Blank line means end of headers */
747 : }
748 :
749 0 : return headers;
750 :
751 : }
752 :
753 : static char *strip_ends(char *name)
754 : {
755 0 : return strip_end(strip_start(name));
756 : }
757 :
758 : /* Strip a parameter of whitespace from start of param */
759 0 : static char *strip_start(char *name)
760 : {
761 : char *p, c;
762 : /* Look for first non white space or quote */
763 0 : for (p = name; (c = *p); p++) {
764 0 : if (c == '"') {
765 : /* Next char is start of string if non null */
766 0 : if (p[1])
767 0 : return p + 1;
768 : /* Else null string */
769 : return NULL;
770 : }
771 0 : if (!isspace((unsigned char)c))
772 : return p;
773 : }
774 : return NULL;
775 : }
776 :
777 : /* As above but strip from end of string : maybe should handle brackets? */
778 0 : static char *strip_end(char *name)
779 : {
780 : char *p, c;
781 0 : if (!name)
782 : return NULL;
783 : /* Look for first non white space or quote */
784 0 : for (p = name + strlen(name) - 1; p >= name; p--) {
785 0 : c = *p;
786 0 : if (c == '"') {
787 0 : if (p - 1 == name)
788 : return NULL;
789 0 : *p = 0;
790 0 : return name;
791 : }
792 0 : if (isspace((unsigned char)c))
793 0 : *p = 0;
794 : else
795 : return name;
796 : }
797 : return NULL;
798 : }
799 :
800 0 : static MIME_HEADER *mime_hdr_new(char *name, char *value)
801 : {
802 : MIME_HEADER *mhdr;
803 : char *tmpname, *tmpval, *p;
804 : int c;
805 0 : if (name) {
806 0 : if (!(tmpname = BUF_strdup(name)))
807 : return NULL;
808 0 : for (p = tmpname; *p; p++) {
809 0 : c = (unsigned char)*p;
810 0 : if (isupper(c)) {
811 0 : c = tolower(c);
812 0 : *p = c;
813 : }
814 : }
815 : } else
816 : tmpname = NULL;
817 0 : if (value) {
818 0 : if (!(tmpval = BUF_strdup(value)))
819 : return NULL;
820 0 : for (p = tmpval; *p; p++) {
821 0 : c = (unsigned char)*p;
822 0 : if (isupper(c)) {
823 0 : c = tolower(c);
824 0 : *p = c;
825 : }
826 : }
827 : } else
828 : tmpval = NULL;
829 0 : mhdr = (MIME_HEADER *)OPENSSL_malloc(sizeof(MIME_HEADER));
830 0 : if (!mhdr)
831 : return NULL;
832 0 : mhdr->name = tmpname;
833 0 : mhdr->value = tmpval;
834 0 : if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)))
835 : return NULL;
836 0 : return mhdr;
837 : }
838 :
839 0 : static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
840 : {
841 : char *tmpname, *tmpval, *p;
842 : int c;
843 : MIME_PARAM *mparam;
844 0 : if (name) {
845 0 : tmpname = BUF_strdup(name);
846 0 : if (!tmpname)
847 : return 0;
848 0 : for (p = tmpname; *p; p++) {
849 0 : c = (unsigned char)*p;
850 0 : if (isupper(c)) {
851 0 : c = tolower(c);
852 0 : *p = c;
853 : }
854 : }
855 : } else
856 : tmpname = NULL;
857 0 : if (value) {
858 0 : tmpval = BUF_strdup(value);
859 0 : if (!tmpval)
860 : return 0;
861 : } else
862 : tmpval = NULL;
863 : /* Parameter values are case sensitive so leave as is */
864 0 : mparam = (MIME_PARAM *)OPENSSL_malloc(sizeof(MIME_PARAM));
865 0 : if (!mparam)
866 : return 0;
867 0 : mparam->param_name = tmpname;
868 0 : mparam->param_value = tmpval;
869 0 : sk_MIME_PARAM_push(mhdr->params, mparam);
870 : return 1;
871 : }
872 :
873 0 : static int mime_hdr_cmp(const MIME_HEADER *const *a,
874 : const MIME_HEADER *const *b)
875 : {
876 0 : if (!(*a)->name || !(*b)->name)
877 0 : return ! !(*a)->name - ! !(*b)->name;
878 :
879 0 : return (strcmp((*a)->name, (*b)->name));
880 : }
881 :
882 0 : static int mime_param_cmp(const MIME_PARAM *const *a,
883 : const MIME_PARAM *const *b)
884 : {
885 0 : if (!(*a)->param_name || !(*b)->param_name)
886 0 : return ! !(*a)->param_name - ! !(*b)->param_name;
887 0 : return (strcmp((*a)->param_name, (*b)->param_name));
888 : }
889 :
890 : /* Find a header with a given name (if possible) */
891 :
892 0 : static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
893 : {
894 : MIME_HEADER htmp;
895 : int idx;
896 0 : htmp.name = name;
897 0 : idx = sk_MIME_HEADER_find(hdrs, &htmp);
898 0 : if (idx < 0)
899 : return NULL;
900 0 : return sk_MIME_HEADER_value(hdrs, idx);
901 : }
902 :
903 0 : static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
904 : {
905 : MIME_PARAM param;
906 : int idx;
907 0 : param.param_name = name;
908 0 : idx = sk_MIME_PARAM_find(hdr->params, ¶m);
909 0 : if (idx < 0)
910 : return NULL;
911 0 : return sk_MIME_PARAM_value(hdr->params, idx);
912 : }
913 :
914 0 : static void mime_hdr_free(MIME_HEADER *hdr)
915 : {
916 0 : if (hdr->name)
917 0 : OPENSSL_free(hdr->name);
918 0 : if (hdr->value)
919 0 : OPENSSL_free(hdr->value);
920 0 : if (hdr->params)
921 0 : sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
922 0 : OPENSSL_free(hdr);
923 0 : }
924 :
925 0 : static void mime_param_free(MIME_PARAM *param)
926 : {
927 0 : if (param->param_name)
928 0 : OPENSSL_free(param->param_name);
929 0 : if (param->param_value)
930 0 : OPENSSL_free(param->param_value);
931 0 : OPENSSL_free(param);
932 0 : }
933 :
934 : /*-
935 : * Check for a multipart boundary. Returns:
936 : * 0 : no boundary
937 : * 1 : part boundary
938 : * 2 : final boundary
939 : */
940 0 : static int mime_bound_check(char *line, int linelen, char *bound, int blen)
941 : {
942 0 : if (linelen == -1)
943 0 : linelen = strlen(line);
944 0 : if (blen == -1)
945 0 : blen = strlen(bound);
946 : /* Quickly eliminate if line length too short */
947 0 : if (blen + 2 > linelen)
948 : return 0;
949 : /* Check for part boundary */
950 0 : if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
951 0 : if (!strncmp(line + blen + 2, "--", 2))
952 : return 2;
953 : else
954 0 : return 1;
955 : }
956 : return 0;
957 : }
958 :
959 : static int strip_eol(char *linebuf, int *plen)
960 : {
961 : int len = *plen;
962 : char *p, c;
963 : int is_eol = 0;
964 : p = linebuf + len - 1;
965 0 : for (p = linebuf + len - 1; len > 0; len--, p--) {
966 0 : c = *p;
967 0 : if (c == '\n')
968 : is_eol = 1;
969 0 : else if (c != '\r')
970 : break;
971 : }
972 : *plen = len;
973 : return is_eol;
974 : }
|
