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8931b30d DSH |
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 | #include "asn1_locl.h" | |
63 | ||
64 | /* Generalised MIME like utilities for streaming ASN1. Although many | |
65 | * have a PKCS7/CMS like flavour others are more general purpose. | |
66 | */ | |
67 | ||
68 | /* MIME format structures | |
69 | * Note that all are translated to lower case apart from | |
70 | * parameter values. Quotes are stripped off | |
71 | */ | |
72 | ||
73 | typedef struct { | |
74 | char *param_name; /* Param name e.g. "micalg" */ | |
75 | char *param_value; /* Param value e.g. "sha1" */ | |
76 | } MIME_PARAM; | |
77 | ||
78 | DECLARE_STACK_OF(MIME_PARAM) | |
79 | IMPLEMENT_STACK_OF(MIME_PARAM) | |
80 | ||
81 | typedef struct { | |
82 | char *name; /* Name of line e.g. "content-type" */ | |
83 | char *value; /* Value of line e.g. "text/plain" */ | |
84 | STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ | |
85 | } MIME_HEADER; | |
86 | ||
87 | DECLARE_STACK_OF(MIME_HEADER) | |
88 | IMPLEMENT_STACK_OF(MIME_HEADER) | |
89 | ||
90 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
91 | const ASN1_ITEM *it); | |
92 | static char * strip_ends(char *name); | |
93 | static char * strip_start(char *name); | |
94 | static char * strip_end(char *name); | |
95 | static MIME_HEADER *mime_hdr_new(char *name, char *value); | |
96 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); | |
97 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); | |
98 | static int mime_hdr_cmp(const MIME_HEADER * const *a, | |
99 | const MIME_HEADER * const *b); | |
100 | static int mime_param_cmp(const MIME_PARAM * const *a, | |
101 | const MIME_PARAM * const *b); | |
102 | static void mime_param_free(MIME_PARAM *param); | |
103 | static int mime_bound_check(char *line, int linelen, char *bound, int blen); | |
104 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); | |
105 | static int strip_eol(char *linebuf, int *plen); | |
106 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); | |
107 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); | |
108 | static void mime_hdr_free(MIME_HEADER *hdr); | |
109 | ||
110 | #define MAX_SMLEN 1024 | |
111 | #define mime_debug(x) /* x */ | |
112 | ||
113 | /* Output an ASN1 structure in BER format streaming if necessary */ | |
114 | ||
115 | int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
116 | const ASN1_ITEM *it) | |
117 | { | |
118 | /* If streaming create stream BIO and copy all content through it */ | |
119 | if (flags & SMIME_STREAM) | |
120 | { | |
121 | BIO *bio, *tbio; | |
122 | bio = BIO_new_NDEF(out, val, it); | |
123 | if (!bio) | |
124 | { | |
125 | ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM,ERR_R_MALLOC_FAILURE); | |
126 | return 0; | |
127 | } | |
128 | SMIME_crlf_copy(in, bio, flags); | |
129 | (void)BIO_flush(bio); | |
130 | /* Free up successive BIOs until we hit the old output BIO */ | |
131 | do | |
132 | { | |
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 | ||
148 | 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 | b64 = BIO_new(BIO_f_base64()); | |
154 | if(!b64) | |
155 | { | |
156 | ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE); | |
157 | return 0; | |
158 | } | |
159 | /* prepend the b64 BIO so all data is base64 encoded. | |
160 | */ | |
161 | out = BIO_push(b64, out); | |
162 | r = i2d_ASN1_bio_stream(out, val, in, flags, it); | |
163 | (void)BIO_flush(out); | |
164 | BIO_pop(out); | |
165 | BIO_free(b64); | |
166 | return r; | |
167 | } | |
168 | ||
169 | /* Streaming ASN1 PEM write */ | |
170 | ||
171 | int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
172 | const char *hdr, | |
173 | const ASN1_ITEM *it) | |
174 | { | |
175 | int r; | |
176 | BIO_printf(out, "-----BEGIN %s-----\n", hdr); | |
177 | r = B64_write_ASN1(out, val, in, flags, it); | |
178 | BIO_printf(out, "-----END %s-----\n", hdr); | |
179 | return r; | |
180 | } | |
181 | ||
182 | static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) | |
183 | { | |
184 | BIO *b64; | |
185 | ASN1_VALUE *val; | |
186 | if(!(b64 = BIO_new(BIO_f_base64()))) { | |
187 | ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE); | |
188 | return 0; | |
189 | } | |
190 | bio = BIO_push(b64, bio); | |
191 | val = ASN1_item_d2i_bio(it, bio, NULL); | |
192 | if(!val) | |
193 | ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR); | |
194 | (void)BIO_flush(bio); | |
195 | bio = BIO_pop(bio); | |
196 | BIO_free(b64); | |
197 | return val; | |
198 | } | |
199 | ||
200 | /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ | |
201 | ||
202 | static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) | |
203 | { | |
204 | const EVP_MD *md; | |
205 | int i, have_unknown = 0, write_comma, ret = 0, md_nid; | |
206 | have_unknown = 0; | |
207 | write_comma = 0; | |
208 | for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) | |
209 | { | |
210 | if (write_comma) | |
211 | BIO_write(out, ",", 1); | |
212 | write_comma = 1; | |
213 | md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); | |
214 | md = EVP_get_digestbynid(md_nid); | |
215 | if (md && md->md_ctrl) | |
216 | { | |
217 | int rv; | |
218 | char *micstr; | |
219 | rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); | |
220 | if (rv > 0) | |
221 | { | |
222 | BIO_puts(out, micstr); | |
223 | OPENSSL_free(micstr); | |
224 | continue; | |
225 | } | |
226 | if (rv != -2) | |
227 | goto err; | |
228 | } | |
229 | switch(md_nid) | |
230 | { | |
231 | case NID_sha1: | |
232 | BIO_puts(out, "sha1"); | |
233 | break; | |
234 | ||
235 | case NID_md5: | |
236 | BIO_puts(out, "md5"); | |
237 | break; | |
238 | ||
239 | case NID_sha256: | |
240 | BIO_puts(out, "sha-256"); | |
241 | break; | |
242 | ||
243 | case NID_sha384: | |
244 | BIO_puts(out, "sha-384"); | |
245 | break; | |
246 | ||
247 | case NID_sha512: | |
248 | BIO_puts(out, "sha-512"); | |
249 | break; | |
250 | ||
251 | case NID_id_GostR3411_94: | |
252 | BIO_puts(out, "gostr3411-94"); | |
253 | goto err; | |
254 | break; | |
255 | ||
256 | default: | |
257 | if (have_unknown) | |
258 | write_comma = 0; | |
259 | else | |
260 | { | |
261 | BIO_puts(out, "unknown"); | |
262 | have_unknown = 1; | |
263 | } | |
264 | break; | |
265 | ||
266 | } | |
267 | } | |
268 | ||
269 | ret = 1; | |
270 | err: | |
271 | ||
272 | return ret; | |
273 | ||
274 | } | |
275 | ||
276 | /* SMIME sender */ | |
277 | ||
278 | int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, | |
2e86f0d8 | 279 | int ctype_nid, int econt_nid, |
8931b30d DSH |
280 | STACK_OF(X509_ALGOR) *mdalgs, |
281 | const ASN1_ITEM *it) | |
282 | { | |
283 | char bound[33], c; | |
284 | int i; | |
285 | const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; | |
286 | const char *msg_type=NULL; | |
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 | RAND_pseudo_bytes((unsigned char *)bound, 32); | |
300 | for(i = 0; i < 32; i++) { | |
301 | c = bound[i] & 0xf; | |
302 | if(c < 10) c += '0'; | |
303 | else c += 'A' - 10; | |
304 | bound[i] = c; | |
305 | } | |
306 | bound[32] = 0; | |
307 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
308 | BIO_printf(bio, "Content-Type: multipart/signed;"); | |
309 | BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); | |
310 | BIO_puts(bio, " micalg=\""); | |
311 | asn1_write_micalg(bio, mdalgs); | |
312 | BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", | |
313 | bound, mime_eol, mime_eol); | |
314 | BIO_printf(bio, "This is an S/MIME signed message%s%s", | |
315 | mime_eol, mime_eol); | |
316 | /* Now write out the first part */ | |
317 | BIO_printf(bio, "------%s%s", bound, mime_eol); | |
318 | if (!asn1_output_data(bio, data, val, flags, it)) | |
319 | return 0; | |
320 | BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); | |
321 | ||
322 | /* Headers for signature */ | |
323 | ||
324 | BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); | |
325 | BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); | |
326 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s", | |
327 | mime_eol); | |
328 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
329 | BIO_printf(bio, " filename=\"smime.p7s\"%s%s", | |
330 | mime_eol, mime_eol); | |
331 | B64_write_ASN1(bio, val, NULL, 0, it); | |
332 | BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound, | |
333 | mime_eol, mime_eol); | |
334 | return 1; | |
335 | } | |
336 | ||
337 | /* Determine smime-type header */ | |
338 | ||
339 | if (ctype_nid == NID_pkcs7_enveloped) | |
340 | msg_type = "enveloped-data"; | |
341 | else if (ctype_nid == NID_pkcs7_signed) | |
342 | { | |
2e86f0d8 DSH |
343 | if (econt_nid == NID_id_smime_ct_receipt) |
344 | msg_type = "signed-receipt"; | |
345 | else if (sk_X509_ALGOR_num(mdalgs) >= 0) | |
8931b30d DSH |
346 | msg_type = "signed-data"; |
347 | else | |
348 | msg_type = "certs-only"; | |
349 | } | |
350 | else if (ctype_nid == NID_id_smime_ct_compressedData) | |
351 | { | |
352 | msg_type = "compressed-data"; | |
353 | cname = "smime.p7z"; | |
354 | } | |
355 | /* MIME headers */ | |
356 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
357 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
358 | BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); | |
359 | BIO_printf(bio, "Content-Type: %smime;", mime_prefix); | |
360 | if (msg_type) | |
361 | BIO_printf(bio, " smime-type=%s;", msg_type); | |
362 | BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); | |
363 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", | |
364 | mime_eol, mime_eol); | |
365 | if (!B64_write_ASN1(bio, val, data, flags, it)) | |
366 | return 0; | |
367 | BIO_printf(bio, "%s", mime_eol); | |
368 | return 1; | |
369 | } | |
370 | ||
371 | /* Handle output of ASN1 data */ | |
372 | ||
373 | ||
374 | static int asn1_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; | |
3c6a7cd4 | 380 | int rv = 1; |
8931b30d | 381 | |
3c6a7cd4 DSH |
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)) | |
8931b30d DSH |
386 | { |
387 | SMIME_crlf_copy(data, out, flags); | |
388 | return 1; | |
389 | } | |
390 | ||
391 | if (!aux || !aux->asn1_cb) | |
392 | { | |
393 | ASN1err(ASN1_F_ASN1_OUTPUT_DATA, | |
394 | ASN1_R_STREAMING_NOT_SUPPORTED); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | sarg.out = out; | |
399 | sarg.ndef_bio = NULL; | |
400 | sarg.boundary = NULL; | |
401 | ||
402 | /* Let ASN1 code prepend any needed BIOs */ | |
403 | ||
404 | if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) | |
405 | return 0; | |
406 | ||
407 | /* Copy data across, passing through filter BIOs for processing */ | |
408 | SMIME_crlf_copy(data, sarg.ndef_bio, flags); | |
409 | ||
410 | /* Finalize structure */ | |
411 | if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) | |
3c6a7cd4 | 412 | rv = 0; |
8931b30d DSH |
413 | |
414 | /* Now remove any digests prepended to the BIO */ | |
415 | ||
416 | while (sarg.ndef_bio != out) | |
417 | { | |
418 | tmpbio = BIO_pop(sarg.ndef_bio); | |
419 | BIO_free(sarg.ndef_bio); | |
420 | sarg.ndef_bio = tmpbio; | |
421 | } | |
422 | ||
3c6a7cd4 | 423 | return rv; |
8931b30d DSH |
424 | |
425 | } | |
426 | ||
427 | /* SMIME reader: handle multipart/signed and opaque signing. | |
428 | * in multipart case the content is placed in a memory BIO | |
429 | * pointed to by "bcont". In opaque this is set to NULL | |
430 | */ | |
431 | ||
2e86f0d8 | 432 | ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) |
8931b30d DSH |
433 | { |
434 | BIO *asnin; | |
435 | STACK_OF(MIME_HEADER) *headers = NULL; | |
436 | STACK_OF(BIO) *parts = NULL; | |
437 | MIME_HEADER *hdr; | |
438 | MIME_PARAM *prm; | |
439 | ASN1_VALUE *val; | |
440 | int ret; | |
441 | ||
442 | if(bcont) *bcont = NULL; | |
443 | ||
444 | if (!(headers = mime_parse_hdr(bio))) { | |
445 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR); | |
446 | return NULL; | |
447 | } | |
448 | ||
449 | if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
450 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
451 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); | |
452 | return NULL; | |
453 | } | |
454 | ||
455 | /* Handle multipart/signed */ | |
456 | ||
457 | if(!strcmp(hdr->value, "multipart/signed")) { | |
458 | /* Split into two parts */ | |
459 | prm = mime_param_find(hdr, "boundary"); | |
460 | if(!prm || !prm->param_value) { | |
461 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
462 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); | |
463 | return NULL; | |
464 | } | |
465 | ret = multi_split(bio, prm->param_value, &parts); | |
466 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
467 | if(!ret || (sk_BIO_num(parts) != 2) ) { | |
468 | ASN1err(ASN1_F_SMIME_READ_ASN1, 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,ASN1_R_MIME_SIG_PARSE_ERROR); | |
478 | sk_BIO_pop_free(parts, BIO_vfree); | |
479 | return NULL; | |
480 | } | |
481 | ||
482 | /* Get content type */ | |
483 | ||
484 | if(!(hdr = mime_hdr_find(headers, "content-type")) || | |
485 | !hdr->value) { | |
486 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
487 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); | |
488 | return NULL; | |
489 | } | |
490 | ||
491 | if(strcmp(hdr->value, "application/x-pkcs7-signature") && | |
492 | strcmp(hdr->value, "application/pkcs7-signature")) { | |
8931b30d DSH |
493 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE); |
494 | ERR_add_error_data(2, "type: ", hdr->value); | |
228a8599 | 495 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
8931b30d DSH |
496 | sk_BIO_pop_free(parts, BIO_vfree); |
497 | return NULL; | |
498 | } | |
499 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
500 | /* Read in ASN1 */ | |
501 | if(!(val = b64_read_asn1(asnin, it))) { | |
502 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR); | |
503 | sk_BIO_pop_free(parts, BIO_vfree); | |
504 | return NULL; | |
505 | } | |
506 | ||
507 | if(bcont) { | |
508 | *bcont = sk_BIO_value(parts, 0); | |
509 | BIO_free(asnin); | |
510 | sk_BIO_free(parts); | |
511 | } else sk_BIO_pop_free(parts, BIO_vfree); | |
512 | return val; | |
513 | } | |
514 | ||
515 | /* OK, if not multipart/signed try opaque signature */ | |
516 | ||
517 | if (strcmp (hdr->value, "application/x-pkcs7-mime") && | |
518 | strcmp (hdr->value, "application/pkcs7-mime")) { | |
519 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE); | |
520 | ERR_add_error_data(2, "type: ", hdr->value); | |
521 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
522 | return NULL; | |
523 | } | |
524 | ||
525 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
526 | ||
527 | if(!(val = b64_read_asn1(bio, it))) { | |
528 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); | |
529 | return NULL; | |
530 | } | |
531 | return val; | |
532 | ||
533 | } | |
534 | ||
535 | /* Copy text from one BIO to another making the output CRLF at EOL */ | |
536 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags) | |
537 | { | |
538 | BIO *bf; | |
539 | char eol; | |
540 | int len; | |
541 | char linebuf[MAX_SMLEN]; | |
542 | /* Buffer output so we don't write one line at a time. This is | |
543 | * useful when streaming as we don't end up with one OCTET STRING | |
544 | * per line. | |
545 | */ | |
546 | bf = BIO_new(BIO_f_buffer()); | |
547 | if (!bf) | |
548 | return 0; | |
549 | out = BIO_push(bf, out); | |
550 | if(flags & SMIME_BINARY) | |
551 | { | |
552 | while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) | |
553 | BIO_write(out, linebuf, len); | |
554 | } | |
555 | else | |
556 | { | |
557 | if(flags & SMIME_TEXT) | |
558 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); | |
559 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) | |
560 | { | |
561 | eol = strip_eol(linebuf, &len); | |
562 | if (len) | |
563 | BIO_write(out, linebuf, len); | |
564 | if(eol) BIO_write(out, "\r\n", 2); | |
565 | } | |
566 | } | |
567 | (void)BIO_flush(out); | |
568 | BIO_pop(out); | |
569 | BIO_free(bf); | |
570 | return 1; | |
571 | } | |
572 | ||
573 | /* Strip off headers if they are text/plain */ | |
574 | int SMIME_text(BIO *in, BIO *out) | |
575 | { | |
576 | char iobuf[4096]; | |
577 | int len; | |
578 | STACK_OF(MIME_HEADER) *headers; | |
579 | MIME_HEADER *hdr; | |
580 | ||
581 | if (!(headers = mime_parse_hdr(in))) { | |
582 | ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR); | |
583 | return 0; | |
584 | } | |
585 | if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
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); | |
6d6c4798 DSH |
599 | if (len < 0) |
600 | return 0; | |
8931b30d DSH |
601 | return 1; |
602 | } | |
603 | ||
604 | /* Split a multipart/XXX message body into component parts: result is | |
605 | * canonical parts in a STACK of bios | |
606 | */ | |
607 | ||
608 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) | |
609 | { | |
610 | char linebuf[MAX_SMLEN]; | |
611 | int len, blen; | |
612 | int eol = 0, next_eol = 0; | |
613 | BIO *bpart = NULL; | |
614 | STACK_OF(BIO) *parts; | |
615 | char state, part, first; | |
616 | ||
617 | blen = strlen(bound); | |
618 | part = 0; | |
619 | state = 0; | |
620 | first = 1; | |
621 | parts = sk_BIO_new_null(); | |
622 | *ret = parts; | |
623 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
624 | state = mime_bound_check(linebuf, len, bound, blen); | |
625 | if(state == 1) { | |
626 | first = 1; | |
627 | part++; | |
628 | } else if(state == 2) { | |
629 | sk_BIO_push(parts, bpart); | |
630 | return 1; | |
631 | } else if(part) { | |
632 | /* Strip CR+LF from linebuf */ | |
633 | next_eol = strip_eol(linebuf, &len); | |
634 | if(first) { | |
635 | first = 0; | |
636 | if(bpart) sk_BIO_push(parts, bpart); | |
637 | bpart = BIO_new(BIO_s_mem()); | |
638 | BIO_set_mem_eof_return(bpart, 0); | |
639 | } else if (eol) | |
640 | BIO_write(bpart, "\r\n", 2); | |
641 | eol = next_eol; | |
642 | if (len) | |
643 | BIO_write(bpart, linebuf, len); | |
644 | } | |
645 | } | |
646 | return 0; | |
647 | } | |
648 | ||
649 | /* This is the big one: parse MIME header lines up to message body */ | |
650 | ||
651 | #define MIME_INVALID 0 | |
652 | #define MIME_START 1 | |
653 | #define MIME_TYPE 2 | |
654 | #define MIME_NAME 3 | |
655 | #define MIME_VALUE 4 | |
656 | #define MIME_QUOTE 5 | |
657 | #define MIME_COMMENT 6 | |
658 | ||
659 | ||
660 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) | |
661 | { | |
662 | char *p, *q, c; | |
663 | char *ntmp; | |
664 | char linebuf[MAX_SMLEN]; | |
665 | MIME_HEADER *mhdr = NULL; | |
666 | STACK_OF(MIME_HEADER) *headers; | |
667 | int len, state, save_state = 0; | |
668 | ||
669 | headers = sk_MIME_HEADER_new(mime_hdr_cmp); | |
670 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
671 | /* If whitespace at line start then continuation line */ | |
672 | if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; | |
673 | else state = MIME_START; | |
674 | ntmp = NULL; | |
675 | /* Go through all characters */ | |
676 | for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { | |
677 | ||
678 | /* State machine to handle MIME headers | |
679 | * if this looks horrible that's because it *is* | |
680 | */ | |
681 | ||
682 | switch(state) { | |
683 | case MIME_START: | |
684 | if(c == ':') { | |
685 | state = MIME_TYPE; | |
686 | *p = 0; | |
687 | ntmp = strip_ends(q); | |
688 | q = p + 1; | |
689 | } | |
690 | break; | |
691 | ||
692 | case MIME_TYPE: | |
693 | if(c == ';') { | |
694 | mime_debug("Found End Value\n"); | |
695 | *p = 0; | |
696 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
697 | sk_MIME_HEADER_push(headers, mhdr); | |
698 | ntmp = NULL; | |
699 | q = p + 1; | |
700 | state = MIME_NAME; | |
701 | } else if(c == '(') { | |
702 | save_state = state; | |
703 | state = MIME_COMMENT; | |
704 | } | |
705 | break; | |
706 | ||
707 | case MIME_COMMENT: | |
708 | if(c == ')') { | |
709 | state = save_state; | |
710 | } | |
711 | break; | |
712 | ||
713 | case MIME_NAME: | |
714 | if(c == '=') { | |
715 | state = MIME_VALUE; | |
716 | *p = 0; | |
717 | ntmp = strip_ends(q); | |
718 | q = p + 1; | |
719 | } | |
720 | break ; | |
721 | ||
722 | case MIME_VALUE: | |
723 | if(c == ';') { | |
724 | state = MIME_NAME; | |
725 | *p = 0; | |
726 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
727 | ntmp = NULL; | |
728 | q = p + 1; | |
729 | } else if (c == '"') { | |
730 | mime_debug("Found Quote\n"); | |
731 | state = MIME_QUOTE; | |
732 | } else if(c == '(') { | |
733 | save_state = state; | |
734 | state = MIME_COMMENT; | |
735 | } | |
736 | break; | |
737 | ||
738 | case MIME_QUOTE: | |
739 | if(c == '"') { | |
740 | mime_debug("Found Match Quote\n"); | |
741 | state = MIME_VALUE; | |
742 | } | |
743 | break; | |
744 | } | |
745 | } | |
746 | ||
747 | if(state == MIME_TYPE) { | |
748 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
749 | sk_MIME_HEADER_push(headers, mhdr); | |
750 | } else if(state == MIME_VALUE) | |
751 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
752 | if(p == linebuf) break; /* Blank line means end of headers */ | |
753 | } | |
754 | ||
755 | return headers; | |
756 | ||
757 | } | |
758 | ||
759 | static char *strip_ends(char *name) | |
760 | { | |
761 | return strip_end(strip_start(name)); | |
762 | } | |
763 | ||
764 | /* Strip a parameter of whitespace from start of param */ | |
765 | static char *strip_start(char *name) | |
766 | { | |
767 | char *p, c; | |
768 | /* Look for first non white space or quote */ | |
769 | for(p = name; (c = *p) ;p++) { | |
770 | if(c == '"') { | |
771 | /* Next char is start of string if non null */ | |
772 | if(p[1]) return p + 1; | |
773 | /* Else null string */ | |
774 | return NULL; | |
775 | } | |
776 | if(!isspace((unsigned char)c)) return p; | |
777 | } | |
778 | return NULL; | |
779 | } | |
780 | ||
781 | /* As above but strip from end of string : maybe should handle brackets? */ | |
782 | static char *strip_end(char *name) | |
783 | { | |
784 | char *p, c; | |
785 | if(!name) return NULL; | |
786 | /* Look for first non white space or quote */ | |
787 | for(p = name + strlen(name) - 1; p >= name ;p--) { | |
788 | c = *p; | |
789 | if(c == '"') { | |
790 | if(p - 1 == name) return NULL; | |
791 | *p = 0; | |
792 | return name; | |
793 | } | |
794 | if(isspace((unsigned char)c)) *p = 0; | |
795 | else return name; | |
796 | } | |
797 | return NULL; | |
798 | } | |
799 | ||
800 | static MIME_HEADER *mime_hdr_new(char *name, char *value) | |
801 | { | |
802 | MIME_HEADER *mhdr; | |
803 | char *tmpname, *tmpval, *p; | |
804 | int c; | |
805 | if(name) { | |
806 | if(!(tmpname = BUF_strdup(name))) return NULL; | |
807 | for(p = tmpname ; *p; p++) { | |
a50bce82 | 808 | c = (unsigned char)*p; |
8931b30d DSH |
809 | if(isupper(c)) { |
810 | c = tolower(c); | |
811 | *p = c; | |
812 | } | |
813 | } | |
814 | } else tmpname = NULL; | |
815 | if(value) { | |
816 | if(!(tmpval = BUF_strdup(value))) return NULL; | |
817 | for(p = tmpval ; *p; p++) { | |
a50bce82 | 818 | c = (unsigned char)*p; |
8931b30d DSH |
819 | if(isupper(c)) { |
820 | c = tolower(c); | |
821 | *p = c; | |
822 | } | |
823 | } | |
824 | } else tmpval = NULL; | |
825 | mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); | |
826 | if(!mhdr) return NULL; | |
827 | mhdr->name = tmpname; | |
828 | mhdr->value = tmpval; | |
829 | if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; | |
830 | return mhdr; | |
831 | } | |
832 | ||
833 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) | |
834 | { | |
835 | char *tmpname, *tmpval, *p; | |
836 | int c; | |
837 | MIME_PARAM *mparam; | |
838 | if(name) { | |
839 | tmpname = BUF_strdup(name); | |
840 | if(!tmpname) return 0; | |
841 | for(p = tmpname ; *p; p++) { | |
a50bce82 | 842 | c = (unsigned char)*p; |
8931b30d DSH |
843 | if(isupper(c)) { |
844 | c = tolower(c); | |
845 | *p = c; | |
846 | } | |
847 | } | |
848 | } else tmpname = NULL; | |
849 | if(value) { | |
850 | tmpval = BUF_strdup(value); | |
851 | if(!tmpval) return 0; | |
852 | } else tmpval = NULL; | |
853 | /* Parameter values are case sensitive so leave as is */ | |
854 | mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); | |
855 | if(!mparam) return 0; | |
856 | mparam->param_name = tmpname; | |
857 | mparam->param_value = tmpval; | |
858 | sk_MIME_PARAM_push(mhdr->params, mparam); | |
859 | return 1; | |
860 | } | |
861 | ||
862 | static int mime_hdr_cmp(const MIME_HEADER * const *a, | |
863 | const MIME_HEADER * const *b) | |
864 | { | |
78dfd439 DSH |
865 | if (!(*a)->name || !(*b)->name) |
866 | return !!(*a)->name - !!(*b)->name; | |
6941b7b9 | 867 | |
8931b30d DSH |
868 | return(strcmp((*a)->name, (*b)->name)); |
869 | } | |
870 | ||
871 | static int mime_param_cmp(const MIME_PARAM * const *a, | |
872 | const MIME_PARAM * const *b) | |
873 | { | |
78dfd439 DSH |
874 | if (!(*a)->param_name || !(*b)->param_name) |
875 | return !!(*a)->param_name - !!(*b)->param_name; | |
8931b30d DSH |
876 | return(strcmp((*a)->param_name, (*b)->param_name)); |
877 | } | |
878 | ||
879 | /* Find a header with a given name (if possible) */ | |
880 | ||
881 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) | |
882 | { | |
883 | MIME_HEADER htmp; | |
884 | int idx; | |
885 | htmp.name = name; | |
886 | idx = sk_MIME_HEADER_find(hdrs, &htmp); | |
887 | if(idx < 0) return NULL; | |
888 | return sk_MIME_HEADER_value(hdrs, idx); | |
889 | } | |
890 | ||
891 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
892 | { | |
893 | MIME_PARAM param; | |
894 | int idx; | |
895 | param.param_name = name; | |
896 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); | |
897 | if(idx < 0) return NULL; | |
898 | return sk_MIME_PARAM_value(hdr->params, idx); | |
899 | } | |
900 | ||
901 | static void mime_hdr_free(MIME_HEADER *hdr) | |
902 | { | |
903 | if(hdr->name) OPENSSL_free(hdr->name); | |
904 | if(hdr->value) OPENSSL_free(hdr->value); | |
905 | if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
906 | OPENSSL_free(hdr); | |
907 | } | |
908 | ||
909 | static void mime_param_free(MIME_PARAM *param) | |
910 | { | |
911 | if(param->param_name) OPENSSL_free(param->param_name); | |
912 | if(param->param_value) OPENSSL_free(param->param_value); | |
913 | OPENSSL_free(param); | |
914 | } | |
915 | ||
916 | /* Check for a multipart boundary. Returns: | |
917 | * 0 : no boundary | |
918 | * 1 : part boundary | |
919 | * 2 : final boundary | |
920 | */ | |
921 | static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
922 | { | |
923 | if(linelen == -1) linelen = strlen(line); | |
924 | if(blen == -1) blen = strlen(bound); | |
925 | /* Quickly eliminate if line length too short */ | |
926 | if(blen + 2 > linelen) return 0; | |
927 | /* Check for part boundary */ | |
928 | if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { | |
929 | if(!strncmp(line + blen + 2, "--", 2)) return 2; | |
930 | else return 1; | |
931 | } | |
932 | return 0; | |
933 | } | |
934 | ||
935 | static int strip_eol(char *linebuf, int *plen) | |
936 | { | |
937 | int len = *plen; | |
938 | char *p, c; | |
939 | int is_eol = 0; | |
940 | p = linebuf + len - 1; | |
941 | for (p = linebuf + len - 1; len > 0; len--, p--) | |
942 | { | |
943 | c = *p; | |
944 | if (c == '\n') | |
945 | is_eol = 1; | |
946 | else if (c != '\r') | |
947 | break; | |
948 | } | |
949 | *plen = len; | |
950 | return is_eol; | |
951 | } |