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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> | |
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 | ||
0f113f3e MC |
65 | /* |
66 | * Generalised MIME like utilities for streaming ASN1. Although many have a | |
67 | * PKCS7/CMS like flavour others are more general purpose. | |
8931b30d DSH |
68 | */ |
69 | ||
0f113f3e MC |
70 | /* |
71 | * MIME format structures Note that all are translated to lower case apart | |
72 | * from parameter values. Quotes are stripped off | |
8931b30d DSH |
73 | */ |
74 | ||
75 | typedef struct { | |
0f113f3e MC |
76 | char *param_name; /* Param name e.g. "micalg" */ |
77 | char *param_value; /* Param value e.g. "sha1" */ | |
8931b30d DSH |
78 | } MIME_PARAM; |
79 | ||
80 | DECLARE_STACK_OF(MIME_PARAM) | |
81 | IMPLEMENT_STACK_OF(MIME_PARAM) | |
82 | ||
83 | typedef 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 | ||
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, | |
0f113f3e MC |
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); | |
8931b30d DSH |
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); | |
0f113f3e MC |
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); | |
8931b30d DSH |
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); | |
847865d0 | 107 | static int strip_eol(char *linebuf, int *plen, int flags); |
8931b30d DSH |
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 | |
0f113f3e | 113 | #define mime_debug(x) /* x */ |
8931b30d DSH |
114 | |
115 | /* Output an ASN1 structure in BER format streaming if necessary */ | |
116 | ||
117 | int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
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, 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 | tbio = BIO_pop(bio); | |
133 | BIO_free(bio); | |
134 | bio = tbio; | |
135 | } while (bio != out); | |
136 | } | |
137 | /* | |
138 | * else just write out ASN1 structure which will have all content stored | |
139 | * internally | |
140 | */ | |
141 | else | |
142 | ASN1_item_i2d_bio(it, out, val); | |
143 | return 1; | |
144 | } | |
8931b30d DSH |
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, | |
0f113f3e MC |
149 | const ASN1_ITEM *it) |
150 | { | |
151 | BIO *b64; | |
152 | int r; | |
153 | b64 = BIO_new(BIO_f_base64()); | |
154 | if (!b64) { | |
155 | ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE); | |
156 | return 0; | |
157 | } | |
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 | } | |
8931b30d DSH |
168 | |
169 | /* Streaming ASN1 PEM write */ | |
170 | ||
171 | int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
172 | const char *hdr, const ASN1_ITEM *it) |
173 | { | |
174 | int r; | |
175 | BIO_printf(out, "-----BEGIN %s-----\n", hdr); | |
176 | r = B64_write_ASN1(out, val, in, flags, it); | |
177 | BIO_printf(out, "-----END %s-----\n", hdr); | |
178 | return r; | |
179 | } | |
8931b30d DSH |
180 | |
181 | static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) | |
182 | { | |
0f113f3e MC |
183 | BIO *b64; |
184 | ASN1_VALUE *val; | |
185 | if (!(b64 = BIO_new(BIO_f_base64()))) { | |
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 | ||
201 | static 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; | |
249 | break; | |
250 | ||
251 | default: | |
252 | if (have_unknown) | |
253 | write_comma = 0; | |
254 | else { | |
255 | BIO_puts(out, "unknown"); | |
256 | have_unknown = 1; | |
257 | } | |
258 | break; | |
259 | ||
260 | } | |
261 | } | |
262 | ||
263 | ret = 1; | |
264 | err: | |
265 | ||
266 | return ret; | |
267 | ||
268 | } | |
8931b30d DSH |
269 | |
270 | /* SMIME sender */ | |
271 | ||
272 | int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, | |
0f113f3e MC |
273 | int ctype_nid, int econt_nid, |
274 | STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it) | |
8931b30d | 275 | { |
0f113f3e MC |
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 | if (flags & SMIME_OLDMIME) | |
281 | mime_prefix = "application/x-pkcs7-"; | |
282 | else | |
283 | mime_prefix = "application/pkcs7-"; | |
284 | ||
285 | if (flags & SMIME_CRLFEOL) | |
286 | mime_eol = "\r\n"; | |
287 | else | |
288 | mime_eol = "\n"; | |
289 | if ((flags & SMIME_DETACHED) && data) { | |
290 | /* We want multipart/signed */ | |
291 | /* Generate a random boundary */ | |
292 | RAND_pseudo_bytes((unsigned char *)bound, 32); | |
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 | 363 | static 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 | 419 | ASN1_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 | ||
432 | if (!(headers = mime_parse_hdr(bio))) { | |
433 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR); | |
434 | return NULL; | |
435 | } | |
436 | ||
437 | if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
438 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
439 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); | |
440 | return NULL; | |
441 | } | |
442 | ||
443 | /* Handle multipart/signed */ | |
444 | ||
445 | if (!strcmp(hdr->value, "multipart/signed")) { | |
446 | /* Split into two parts */ | |
447 | prm = mime_param_find(hdr, "boundary"); | |
448 | if (!prm || !prm->param_value) { | |
449 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
450 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); | |
451 | return NULL; | |
452 | } | |
453 | ret = multi_split(bio, prm->param_value, &parts); | |
454 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
455 | if (!ret || (sk_BIO_num(parts) != 2)) { | |
456 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); | |
457 | sk_BIO_pop_free(parts, BIO_vfree); | |
458 | return NULL; | |
459 | } | |
460 | ||
461 | /* Parse the signature piece */ | |
462 | asnin = sk_BIO_value(parts, 1); | |
463 | ||
464 | if (!(headers = mime_parse_hdr(asnin))) { | |
465 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR); | |
466 | sk_BIO_pop_free(parts, BIO_vfree); | |
467 | return NULL; | |
468 | } | |
469 | ||
470 | /* Get content type */ | |
471 | ||
472 | if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
473 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
474 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); | |
475 | return NULL; | |
476 | } | |
477 | ||
478 | if (strcmp(hdr->value, "application/x-pkcs7-signature") && | |
479 | strcmp(hdr->value, "application/pkcs7-signature")) { | |
480 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE); | |
481 | ERR_add_error_data(2, "type: ", hdr->value); | |
482 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
483 | sk_BIO_pop_free(parts, BIO_vfree); | |
484 | return NULL; | |
485 | } | |
486 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
487 | /* Read in ASN1 */ | |
488 | if (!(val = b64_read_asn1(asnin, it))) { | |
489 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR); | |
490 | sk_BIO_pop_free(parts, BIO_vfree); | |
491 | return NULL; | |
492 | } | |
493 | ||
494 | if (bcont) { | |
495 | *bcont = sk_BIO_value(parts, 0); | |
496 | BIO_free(asnin); | |
497 | sk_BIO_free(parts); | |
498 | } else | |
499 | sk_BIO_pop_free(parts, BIO_vfree); | |
500 | return val; | |
501 | } | |
502 | ||
503 | /* OK, if not multipart/signed try opaque signature */ | |
504 | ||
505 | if (strcmp(hdr->value, "application/x-pkcs7-mime") && | |
506 | strcmp(hdr->value, "application/pkcs7-mime")) { | |
507 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE); | |
508 | ERR_add_error_data(2, "type: ", hdr->value); | |
509 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
510 | return NULL; | |
511 | } | |
512 | ||
513 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
514 | ||
515 | if (!(val = b64_read_asn1(bio, it))) { | |
516 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); | |
517 | return NULL; | |
518 | } | |
519 | return val; | |
8931b30d DSH |
520 | |
521 | } | |
522 | ||
523 | /* Copy text from one BIO to another making the output CRLF at EOL */ | |
524 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags) | |
525 | { | |
0f113f3e MC |
526 | BIO *bf; |
527 | char eol; | |
528 | int len; | |
529 | char linebuf[MAX_SMLEN]; | |
530 | /* | |
531 | * Buffer output so we don't write one line at a time. This is useful | |
532 | * when streaming as we don't end up with one OCTET STRING per line. | |
533 | */ | |
534 | bf = BIO_new(BIO_f_buffer()); | |
535 | if (!bf) | |
536 | return 0; | |
537 | out = BIO_push(bf, out); | |
538 | if (flags & SMIME_BINARY) { | |
539 | while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) | |
540 | BIO_write(out, linebuf, len); | |
541 | } else { | |
542 | int eolcnt = 0; | |
543 | if (flags & SMIME_TEXT) | |
544 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); | |
545 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { | |
546 | eol = strip_eol(linebuf, &len, flags); | |
547 | if (len) { | |
548 | /* Not EOF: write out all CRLF */ | |
549 | if (flags & SMIME_ASCIICRLF) { | |
550 | int i; | |
551 | for (i = 0; i < eolcnt; i++) | |
552 | BIO_write(out, "\r\n", 2); | |
553 | eolcnt = 0; | |
554 | } | |
555 | BIO_write(out, linebuf, len); | |
556 | if (eol) | |
557 | BIO_write(out, "\r\n", 2); | |
558 | } else if (flags & SMIME_ASCIICRLF) | |
559 | eolcnt++; | |
560 | else if (eol) | |
561 | BIO_write(out, "\r\n", 2); | |
562 | } | |
563 | } | |
564 | (void)BIO_flush(out); | |
565 | BIO_pop(out); | |
566 | BIO_free(bf); | |
567 | return 1; | |
8931b30d DSH |
568 | } |
569 | ||
570 | /* Strip off headers if they are text/plain */ | |
571 | int SMIME_text(BIO *in, BIO *out) | |
572 | { | |
0f113f3e MC |
573 | char iobuf[4096]; |
574 | int len; | |
575 | STACK_OF(MIME_HEADER) *headers; | |
576 | MIME_HEADER *hdr; | |
577 | ||
578 | if (!(headers = mime_parse_hdr(in))) { | |
579 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR); | |
580 | return 0; | |
581 | } | |
582 | if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
583 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE); | |
584 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
585 | return 0; | |
586 | } | |
587 | if (strcmp(hdr->value, "text/plain")) { | |
588 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE); | |
589 | ERR_add_error_data(2, "type: ", hdr->value); | |
590 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
591 | return 0; | |
592 | } | |
593 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
594 | while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) | |
595 | BIO_write(out, iobuf, len); | |
596 | if (len < 0) | |
597 | return 0; | |
598 | return 1; | |
8931b30d DSH |
599 | } |
600 | ||
0f113f3e MC |
601 | /* |
602 | * Split a multipart/XXX message body into component parts: result is | |
8931b30d DSH |
603 | * canonical parts in a STACK of bios |
604 | */ | |
605 | ||
606 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) | |
607 | { | |
0f113f3e MC |
608 | char linebuf[MAX_SMLEN]; |
609 | int len, blen; | |
610 | int eol = 0, next_eol = 0; | |
611 | BIO *bpart = NULL; | |
612 | STACK_OF(BIO) *parts; | |
613 | char state, part, first; | |
614 | ||
615 | blen = strlen(bound); | |
616 | part = 0; | |
617 | state = 0; | |
618 | first = 1; | |
619 | parts = sk_BIO_new_null(); | |
620 | *ret = parts; | |
621 | if (*ret == NULL) | |
622 | return 0; | |
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 | if (!sk_BIO_push(parts, bpart)) { | |
630 | BIO_free(bpart); | |
631 | return 0; | |
632 | } | |
633 | return 1; | |
634 | } else if (part) { | |
635 | /* Strip CR+LF from linebuf */ | |
636 | next_eol = strip_eol(linebuf, &len, 0); | |
637 | if (first) { | |
638 | first = 0; | |
639 | if (bpart) | |
640 | if (!sk_BIO_push(parts, bpart)) { | |
641 | BIO_free(bpart); | |
642 | return 0; | |
643 | } | |
644 | bpart = BIO_new(BIO_s_mem()); | |
645 | if (bpart == NULL) | |
646 | return 0; | |
647 | BIO_set_mem_eof_return(bpart, 0); | |
648 | } else if (eol) | |
649 | BIO_write(bpart, "\r\n", 2); | |
650 | eol = next_eol; | |
651 | if (len) | |
652 | BIO_write(bpart, linebuf, len); | |
653 | } | |
654 | } | |
655 | if (bpart != NULL) | |
656 | BIO_free(bpart); | |
657 | return 0; | |
8931b30d DSH |
658 | } |
659 | ||
660 | /* This is the big one: parse MIME header lines up to message body */ | |
661 | ||
0f113f3e MC |
662 | #define MIME_INVALID 0 |
663 | #define MIME_START 1 | |
664 | #define MIME_TYPE 2 | |
665 | #define MIME_NAME 3 | |
666 | #define MIME_VALUE 4 | |
667 | #define MIME_QUOTE 5 | |
668 | #define MIME_COMMENT 6 | |
8931b30d DSH |
669 | |
670 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) | |
671 | { | |
0f113f3e MC |
672 | char *p, *q, c; |
673 | char *ntmp; | |
674 | char linebuf[MAX_SMLEN]; | |
675 | MIME_HEADER *mhdr = NULL; | |
676 | STACK_OF(MIME_HEADER) *headers; | |
677 | int len, state, save_state = 0; | |
678 | ||
679 | headers = sk_MIME_HEADER_new(mime_hdr_cmp); | |
680 | if (!headers) | |
681 | return NULL; | |
682 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
683 | /* If whitespace at line start then continuation line */ | |
684 | if (mhdr && isspace((unsigned char)linebuf[0])) | |
685 | state = MIME_NAME; | |
686 | else | |
687 | state = MIME_START; | |
688 | ntmp = NULL; | |
689 | /* Go through all characters */ | |
690 | for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n'); | |
691 | p++) { | |
692 | ||
693 | /* | |
694 | * State machine to handle MIME headers if this looks horrible | |
695 | * that's because it *is* | |
696 | */ | |
697 | ||
698 | switch (state) { | |
699 | case MIME_START: | |
700 | if (c == ':') { | |
701 | state = MIME_TYPE; | |
702 | *p = 0; | |
703 | ntmp = strip_ends(q); | |
704 | q = p + 1; | |
705 | } | |
706 | break; | |
707 | ||
708 | case MIME_TYPE: | |
709 | if (c == ';') { | |
710 | mime_debug("Found End Value\n"); | |
711 | *p = 0; | |
712 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
713 | sk_MIME_HEADER_push(headers, mhdr); | |
714 | ntmp = NULL; | |
715 | q = p + 1; | |
716 | state = MIME_NAME; | |
717 | } else if (c == '(') { | |
718 | save_state = state; | |
719 | state = MIME_COMMENT; | |
720 | } | |
721 | break; | |
722 | ||
723 | case MIME_COMMENT: | |
724 | if (c == ')') { | |
725 | state = save_state; | |
726 | } | |
727 | break; | |
728 | ||
729 | case MIME_NAME: | |
730 | if (c == '=') { | |
731 | state = MIME_VALUE; | |
732 | *p = 0; | |
733 | ntmp = strip_ends(q); | |
734 | q = p + 1; | |
735 | } | |
736 | break; | |
737 | ||
738 | case MIME_VALUE: | |
739 | if (c == ';') { | |
740 | state = MIME_NAME; | |
741 | *p = 0; | |
742 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
743 | ntmp = NULL; | |
744 | q = p + 1; | |
745 | } else if (c == '"') { | |
746 | mime_debug("Found Quote\n"); | |
747 | state = MIME_QUOTE; | |
748 | } else if (c == '(') { | |
749 | save_state = state; | |
750 | state = MIME_COMMENT; | |
751 | } | |
752 | break; | |
753 | ||
754 | case MIME_QUOTE: | |
755 | if (c == '"') { | |
756 | mime_debug("Found Match Quote\n"); | |
757 | state = MIME_VALUE; | |
758 | } | |
759 | break; | |
760 | } | |
761 | } | |
762 | ||
763 | if (state == MIME_TYPE) { | |
764 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
765 | sk_MIME_HEADER_push(headers, mhdr); | |
766 | } else if (state == MIME_VALUE) | |
767 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
768 | if (p == linebuf) | |
769 | break; /* Blank line means end of headers */ | |
770 | } | |
771 | ||
772 | return headers; | |
8931b30d DSH |
773 | |
774 | } | |
775 | ||
776 | static char *strip_ends(char *name) | |
777 | { | |
0f113f3e | 778 | return strip_end(strip_start(name)); |
8931b30d DSH |
779 | } |
780 | ||
781 | /* Strip a parameter of whitespace from start of param */ | |
782 | static char *strip_start(char *name) | |
783 | { | |
0f113f3e MC |
784 | char *p, c; |
785 | /* Look for first non white space or quote */ | |
786 | for (p = name; (c = *p); p++) { | |
787 | if (c == '"') { | |
788 | /* Next char is start of string if non null */ | |
789 | if (p[1]) | |
790 | return p + 1; | |
791 | /* Else null string */ | |
792 | return NULL; | |
793 | } | |
794 | if (!isspace((unsigned char)c)) | |
795 | return p; | |
796 | } | |
797 | return NULL; | |
8931b30d DSH |
798 | } |
799 | ||
800 | /* As above but strip from end of string : maybe should handle brackets? */ | |
801 | static char *strip_end(char *name) | |
802 | { | |
0f113f3e MC |
803 | char *p, c; |
804 | if (!name) | |
805 | return NULL; | |
806 | /* Look for first non white space or quote */ | |
807 | for (p = name + strlen(name) - 1; p >= name; p--) { | |
808 | c = *p; | |
809 | if (c == '"') { | |
810 | if (p - 1 == name) | |
811 | return NULL; | |
812 | *p = 0; | |
813 | return name; | |
814 | } | |
815 | if (isspace((unsigned char)c)) | |
816 | *p = 0; | |
817 | else | |
818 | return name; | |
819 | } | |
820 | return NULL; | |
8931b30d DSH |
821 | } |
822 | ||
823 | static MIME_HEADER *mime_hdr_new(char *name, char *value) | |
824 | { | |
0f113f3e MC |
825 | MIME_HEADER *mhdr = NULL; |
826 | char *tmpname = NULL, *tmpval = NULL, *p; | |
827 | int c; | |
828 | if (name) { | |
829 | if (!(tmpname = BUF_strdup(name))) | |
830 | return NULL; | |
831 | for (p = tmpname; *p; p++) { | |
832 | c = (unsigned char)*p; | |
833 | if (isupper(c)) { | |
834 | c = tolower(c); | |
835 | *p = c; | |
836 | } | |
837 | } | |
838 | } | |
839 | if (value) { | |
840 | if (!(tmpval = BUF_strdup(value))) | |
841 | goto err; | |
842 | for (p = tmpval; *p; p++) { | |
843 | c = (unsigned char)*p; | |
844 | if (isupper(c)) { | |
845 | c = tolower(c); | |
846 | *p = c; | |
847 | } | |
848 | } | |
849 | } | |
850 | mhdr = (MIME_HEADER *)OPENSSL_malloc(sizeof(MIME_HEADER)); | |
851 | if (!mhdr) | |
852 | goto err; | |
853 | mhdr->name = tmpname; | |
854 | mhdr->value = tmpval; | |
855 | if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) | |
856 | goto err; | |
857 | return mhdr; | |
858 | ||
859 | err: | |
860 | if (tmpname != NULL) | |
861 | OPENSSL_free(tmpname); | |
862 | if (tmpval != NULL) | |
863 | OPENSSL_free(tmpval); | |
864 | if (mhdr != NULL) | |
865 | OPENSSL_free(mhdr); | |
866 | return NULL; | |
8931b30d | 867 | } |
0f113f3e | 868 | |
8931b30d DSH |
869 | static 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) { | |
875 | tmpname = BUF_strdup(name); | |
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) { | |
887 | tmpval = BUF_strdup(value); | |
888 | if (!tmpval) | |
889 | goto err; | |
890 | } | |
891 | /* Parameter values are case sensitive so leave as is */ | |
892 | mparam = (MIME_PARAM *)OPENSSL_malloc(sizeof(MIME_PARAM)); | |
893 | if (!mparam) | |
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: | |
901 | if (tmpname != NULL) | |
902 | OPENSSL_free(tmpname); | |
903 | if (tmpval != NULL) | |
904 | OPENSSL_free(tmpval); | |
905 | if (mparam != NULL) | |
906 | OPENSSL_free(mparam); | |
907 | return 0; | |
8931b30d DSH |
908 | } |
909 | ||
0f113f3e MC |
910 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
911 | const MIME_HEADER *const *b) | |
8931b30d | 912 | { |
0f113f3e MC |
913 | if (!(*a)->name || !(*b)->name) |
914 | return ! !(*a)->name - ! !(*b)->name; | |
6941b7b9 | 915 | |
0f113f3e | 916 | return (strcmp((*a)->name, (*b)->name)); |
8931b30d DSH |
917 | } |
918 | ||
0f113f3e MC |
919 | static int mime_param_cmp(const MIME_PARAM *const *a, |
920 | const MIME_PARAM *const *b) | |
8931b30d | 921 | { |
0f113f3e MC |
922 | if (!(*a)->param_name || !(*b)->param_name) |
923 | return ! !(*a)->param_name - ! !(*b)->param_name; | |
924 | return (strcmp((*a)->param_name, (*b)->param_name)); | |
8931b30d DSH |
925 | } |
926 | ||
927 | /* Find a header with a given name (if possible) */ | |
928 | ||
929 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) | |
930 | { | |
0f113f3e MC |
931 | MIME_HEADER htmp; |
932 | int idx; | |
933 | htmp.name = name; | |
934 | idx = sk_MIME_HEADER_find(hdrs, &htmp); | |
935 | if (idx < 0) | |
936 | return NULL; | |
937 | return sk_MIME_HEADER_value(hdrs, idx); | |
8931b30d DSH |
938 | } |
939 | ||
940 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
941 | { | |
0f113f3e MC |
942 | MIME_PARAM param; |
943 | int idx; | |
944 | param.param_name = name; | |
945 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); | |
946 | if (idx < 0) | |
947 | return NULL; | |
948 | return sk_MIME_PARAM_value(hdr->params, idx); | |
8931b30d DSH |
949 | } |
950 | ||
951 | static void mime_hdr_free(MIME_HEADER *hdr) | |
952 | { | |
0f113f3e MC |
953 | if (hdr->name) |
954 | OPENSSL_free(hdr->name); | |
955 | if (hdr->value) | |
956 | OPENSSL_free(hdr->value); | |
957 | if (hdr->params) | |
958 | sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
959 | OPENSSL_free(hdr); | |
8931b30d DSH |
960 | } |
961 | ||
962 | static void mime_param_free(MIME_PARAM *param) | |
963 | { | |
0f113f3e MC |
964 | if (param->param_name) |
965 | OPENSSL_free(param->param_name); | |
966 | if (param->param_value) | |
967 | OPENSSL_free(param->param_value); | |
968 | OPENSSL_free(param); | |
8931b30d DSH |
969 | } |
970 | ||
c80fd6b2 MC |
971 | /*- |
972 | * Check for a multipart boundary. Returns: | |
8931b30d DSH |
973 | * 0 : no boundary |
974 | * 1 : part boundary | |
975 | * 2 : final boundary | |
976 | */ | |
977 | static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
978 | { | |
0f113f3e MC |
979 | if (linelen == -1) |
980 | linelen = strlen(line); | |
981 | if (blen == -1) | |
982 | blen = strlen(bound); | |
983 | /* Quickly eliminate if line length too short */ | |
984 | if (blen + 2 > linelen) | |
985 | return 0; | |
986 | /* Check for part boundary */ | |
987 | if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { | |
988 | if (!strncmp(line + blen + 2, "--", 2)) | |
989 | return 2; | |
990 | else | |
991 | return 1; | |
992 | } | |
993 | return 0; | |
8931b30d DSH |
994 | } |
995 | ||
847865d0 | 996 | static int strip_eol(char *linebuf, int *plen, int flags) |
0f113f3e MC |
997 | { |
998 | int len = *plen; | |
999 | char *p, c; | |
1000 | int is_eol = 0; | |
1001 | p = linebuf + len - 1; | |
1002 | for (p = linebuf + len - 1; len > 0; len--, p--) { | |
1003 | c = *p; | |
1004 | if (c == '\n') | |
1005 | is_eol = 1; | |
1006 | else if (is_eol && flags & SMIME_ASCIICRLF && c < 33) | |
1007 | continue; | |
1008 | else if (c != '\r') | |
1009 | break; | |
1010 | } | |
1011 | *plen = len; | |
1012 | return is_eol; | |
1013 | } |