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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) | |
8931b30d DSH |
81 | |
82 | typedef struct { | |
0f113f3e MC |
83 | char *name; /* Name of line e.g. "content-type" */ |
84 | char *value; /* Value of line e.g. "text/plain" */ | |
85 | STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ | |
8931b30d DSH |
86 | } MIME_HEADER; |
87 | ||
88 | DECLARE_STACK_OF(MIME_HEADER) | |
8931b30d DSH |
89 | |
90 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
0f113f3e MC |
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); | |
8931b30d DSH |
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); | |
0f113f3e MC |
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); | |
8931b30d DSH |
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); | |
847865d0 | 105 | static int strip_eol(char *linebuf, int *plen, int flags); |
8931b30d DSH |
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 | |
0f113f3e | 111 | #define mime_debug(x) /* x */ |
8931b30d DSH |
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, | |
0f113f3e MC |
116 | const ASN1_ITEM *it) |
117 | { | |
118 | /* If streaming create stream BIO and copy all content through it */ | |
119 | if (flags & SMIME_STREAM) { | |
120 | BIO *bio, *tbio; | |
121 | bio = BIO_new_NDEF(out, val, it); | |
122 | if (!bio) { | |
123 | ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE); | |
124 | return 0; | |
125 | } | |
126 | SMIME_crlf_copy(in, bio, flags); | |
127 | (void)BIO_flush(bio); | |
128 | /* Free up successive BIOs until we hit the old output BIO */ | |
129 | do { | |
130 | tbio = BIO_pop(bio); | |
131 | BIO_free(bio); | |
132 | bio = tbio; | |
133 | } while (bio != out); | |
134 | } | |
135 | /* | |
136 | * else just write out ASN1 structure which will have all content stored | |
137 | * internally | |
138 | */ | |
139 | else | |
140 | ASN1_item_i2d_bio(it, out, val); | |
141 | return 1; | |
142 | } | |
8931b30d DSH |
143 | |
144 | /* Base 64 read and write of ASN1 structure */ | |
145 | ||
146 | static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
147 | const ASN1_ITEM *it) |
148 | { | |
149 | BIO *b64; | |
150 | int r; | |
151 | b64 = BIO_new(BIO_f_base64()); | |
152 | if (!b64) { | |
153 | ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE); | |
154 | return 0; | |
155 | } | |
156 | /* | |
157 | * prepend the b64 BIO so all data is base64 encoded. | |
158 | */ | |
159 | out = BIO_push(b64, out); | |
160 | r = i2d_ASN1_bio_stream(out, val, in, flags, it); | |
161 | (void)BIO_flush(out); | |
162 | BIO_pop(out); | |
163 | BIO_free(b64); | |
164 | return r; | |
165 | } | |
8931b30d DSH |
166 | |
167 | /* Streaming ASN1 PEM write */ | |
168 | ||
169 | int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
170 | const char *hdr, const ASN1_ITEM *it) |
171 | { | |
172 | int r; | |
173 | BIO_printf(out, "-----BEGIN %s-----\n", hdr); | |
174 | r = B64_write_ASN1(out, val, in, flags, it); | |
175 | BIO_printf(out, "-----END %s-----\n", hdr); | |
176 | return r; | |
177 | } | |
8931b30d DSH |
178 | |
179 | static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) | |
180 | { | |
0f113f3e MC |
181 | BIO *b64; |
182 | ASN1_VALUE *val; | |
183 | if (!(b64 = BIO_new(BIO_f_base64()))) { | |
184 | ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE); | |
185 | return 0; | |
186 | } | |
187 | bio = BIO_push(b64, bio); | |
188 | val = ASN1_item_d2i_bio(it, bio, NULL); | |
189 | if (!val) | |
190 | ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR); | |
191 | (void)BIO_flush(bio); | |
192 | bio = BIO_pop(bio); | |
193 | BIO_free(b64); | |
194 | return val; | |
8931b30d DSH |
195 | } |
196 | ||
197 | /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ | |
198 | ||
199 | static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) | |
0f113f3e MC |
200 | { |
201 | const EVP_MD *md; | |
202 | int i, have_unknown = 0, write_comma, ret = 0, md_nid; | |
203 | have_unknown = 0; | |
204 | write_comma = 0; | |
205 | for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) { | |
206 | if (write_comma) | |
207 | BIO_write(out, ",", 1); | |
208 | write_comma = 1; | |
209 | md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); | |
210 | md = EVP_get_digestbynid(md_nid); | |
211 | if (md && md->md_ctrl) { | |
212 | int rv; | |
213 | char *micstr; | |
214 | rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); | |
215 | if (rv > 0) { | |
216 | BIO_puts(out, micstr); | |
217 | OPENSSL_free(micstr); | |
218 | continue; | |
219 | } | |
220 | if (rv != -2) | |
221 | goto err; | |
222 | } | |
223 | switch (md_nid) { | |
224 | case NID_sha1: | |
225 | BIO_puts(out, "sha1"); | |
226 | break; | |
227 | ||
228 | case NID_md5: | |
229 | BIO_puts(out, "md5"); | |
230 | break; | |
231 | ||
232 | case NID_sha256: | |
233 | BIO_puts(out, "sha-256"); | |
234 | break; | |
235 | ||
236 | case NID_sha384: | |
237 | BIO_puts(out, "sha-384"); | |
238 | break; | |
239 | ||
240 | case NID_sha512: | |
241 | BIO_puts(out, "sha-512"); | |
242 | break; | |
243 | ||
244 | case NID_id_GostR3411_94: | |
245 | BIO_puts(out, "gostr3411-94"); | |
246 | goto err; | |
0f113f3e MC |
247 | |
248 | default: | |
249 | if (have_unknown) | |
250 | write_comma = 0; | |
251 | else { | |
252 | BIO_puts(out, "unknown"); | |
253 | have_unknown = 1; | |
254 | } | |
255 | break; | |
256 | ||
257 | } | |
258 | } | |
259 | ||
260 | ret = 1; | |
261 | err: | |
262 | ||
263 | return ret; | |
264 | ||
265 | } | |
8931b30d DSH |
266 | |
267 | /* SMIME sender */ | |
268 | ||
269 | int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, | |
0f113f3e MC |
270 | int ctype_nid, int econt_nid, |
271 | STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it) | |
8931b30d | 272 | { |
0f113f3e MC |
273 | char bound[33], c; |
274 | int i; | |
275 | const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; | |
276 | const char *msg_type = NULL; | |
277 | if (flags & SMIME_OLDMIME) | |
278 | mime_prefix = "application/x-pkcs7-"; | |
279 | else | |
280 | mime_prefix = "application/pkcs7-"; | |
281 | ||
282 | if (flags & SMIME_CRLFEOL) | |
283 | mime_eol = "\r\n"; | |
284 | else | |
285 | mime_eol = "\n"; | |
286 | if ((flags & SMIME_DETACHED) && data) { | |
287 | /* We want multipart/signed */ | |
288 | /* Generate a random boundary */ | |
266483d2 MC |
289 | if (RAND_bytes((unsigned char *)bound, 32) <= 0) |
290 | return 0; | |
0f113f3e MC |
291 | for (i = 0; i < 32; i++) { |
292 | c = bound[i] & 0xf; | |
293 | if (c < 10) | |
294 | c += '0'; | |
295 | else | |
296 | c += 'A' - 10; | |
297 | bound[i] = c; | |
298 | } | |
299 | bound[32] = 0; | |
300 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
301 | BIO_printf(bio, "Content-Type: multipart/signed;"); | |
302 | BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); | |
303 | BIO_puts(bio, " micalg=\""); | |
304 | asn1_write_micalg(bio, mdalgs); | |
305 | BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", | |
306 | bound, mime_eol, mime_eol); | |
307 | BIO_printf(bio, "This is an S/MIME signed message%s%s", | |
308 | mime_eol, mime_eol); | |
309 | /* Now write out the first part */ | |
310 | BIO_printf(bio, "------%s%s", bound, mime_eol); | |
311 | if (!asn1_output_data(bio, data, val, flags, it)) | |
312 | return 0; | |
313 | BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); | |
314 | ||
315 | /* Headers for signature */ | |
316 | ||
317 | BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); | |
318 | BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); | |
319 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol); | |
320 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
321 | BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol); | |
322 | B64_write_ASN1(bio, val, NULL, 0, it); | |
323 | BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound, | |
324 | mime_eol, mime_eol); | |
325 | return 1; | |
326 | } | |
327 | ||
328 | /* Determine smime-type header */ | |
329 | ||
330 | if (ctype_nid == NID_pkcs7_enveloped) | |
331 | msg_type = "enveloped-data"; | |
332 | else if (ctype_nid == NID_pkcs7_signed) { | |
333 | if (econt_nid == NID_id_smime_ct_receipt) | |
334 | msg_type = "signed-receipt"; | |
335 | else if (sk_X509_ALGOR_num(mdalgs) >= 0) | |
336 | msg_type = "signed-data"; | |
337 | else | |
338 | msg_type = "certs-only"; | |
339 | } else if (ctype_nid == NID_id_smime_ct_compressedData) { | |
340 | msg_type = "compressed-data"; | |
341 | cname = "smime.p7z"; | |
342 | } | |
343 | /* MIME headers */ | |
344 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
345 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
346 | BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); | |
347 | BIO_printf(bio, "Content-Type: %smime;", mime_prefix); | |
348 | if (msg_type) | |
349 | BIO_printf(bio, " smime-type=%s;", msg_type); | |
350 | BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); | |
351 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", | |
352 | mime_eol, mime_eol); | |
353 | if (!B64_write_ASN1(bio, val, data, flags, it)) | |
354 | return 0; | |
355 | BIO_printf(bio, "%s", mime_eol); | |
356 | return 1; | |
8931b30d DSH |
357 | } |
358 | ||
359 | /* Handle output of ASN1 data */ | |
360 | ||
8931b30d | 361 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, |
0f113f3e MC |
362 | const ASN1_ITEM *it) |
363 | { | |
364 | BIO *tmpbio; | |
365 | const ASN1_AUX *aux = it->funcs; | |
366 | ASN1_STREAM_ARG sarg; | |
367 | int rv = 1; | |
368 | ||
369 | /* | |
370 | * If data is not deteched or resigning then the output BIO is already | |
371 | * set up to finalise when it is written through. | |
372 | */ | |
373 | if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) { | |
374 | SMIME_crlf_copy(data, out, flags); | |
375 | return 1; | |
376 | } | |
377 | ||
378 | if (!aux || !aux->asn1_cb) { | |
379 | ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | sarg.out = out; | |
384 | sarg.ndef_bio = NULL; | |
385 | sarg.boundary = NULL; | |
386 | ||
387 | /* Let ASN1 code prepend any needed BIOs */ | |
388 | ||
389 | if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) | |
390 | return 0; | |
391 | ||
392 | /* Copy data across, passing through filter BIOs for processing */ | |
393 | SMIME_crlf_copy(data, sarg.ndef_bio, flags); | |
394 | ||
395 | /* Finalize structure */ | |
396 | if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) | |
397 | rv = 0; | |
398 | ||
399 | /* Now remove any digests prepended to the BIO */ | |
400 | ||
401 | while (sarg.ndef_bio != out) { | |
402 | tmpbio = BIO_pop(sarg.ndef_bio); | |
403 | BIO_free(sarg.ndef_bio); | |
404 | sarg.ndef_bio = tmpbio; | |
405 | } | |
406 | ||
407 | return rv; | |
408 | ||
409 | } | |
410 | ||
411 | /* | |
412 | * SMIME reader: handle multipart/signed and opaque signing. in multipart | |
413 | * case the content is placed in a memory BIO pointed to by "bcont". In | |
414 | * opaque this is set to NULL | |
8931b30d DSH |
415 | */ |
416 | ||
2e86f0d8 | 417 | ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) |
8931b30d | 418 | { |
0f113f3e MC |
419 | BIO *asnin; |
420 | STACK_OF(MIME_HEADER) *headers = NULL; | |
421 | STACK_OF(BIO) *parts = NULL; | |
422 | MIME_HEADER *hdr; | |
423 | MIME_PARAM *prm; | |
424 | ASN1_VALUE *val; | |
425 | int ret; | |
426 | ||
427 | if (bcont) | |
428 | *bcont = NULL; | |
429 | ||
430 | if (!(headers = mime_parse_hdr(bio))) { | |
431 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR); | |
432 | return NULL; | |
433 | } | |
434 | ||
435 | if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
436 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
437 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); | |
438 | return NULL; | |
439 | } | |
440 | ||
441 | /* Handle multipart/signed */ | |
442 | ||
443 | if (!strcmp(hdr->value, "multipart/signed")) { | |
444 | /* Split into two parts */ | |
445 | prm = mime_param_find(hdr, "boundary"); | |
446 | if (!prm || !prm->param_value) { | |
447 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
448 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); | |
449 | return NULL; | |
450 | } | |
451 | ret = multi_split(bio, prm->param_value, &parts); | |
452 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
453 | if (!ret || (sk_BIO_num(parts) != 2)) { | |
454 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); | |
455 | sk_BIO_pop_free(parts, BIO_vfree); | |
456 | return NULL; | |
457 | } | |
458 | ||
459 | /* Parse the signature piece */ | |
460 | asnin = sk_BIO_value(parts, 1); | |
461 | ||
462 | if (!(headers = mime_parse_hdr(asnin))) { | |
463 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR); | |
464 | sk_BIO_pop_free(parts, BIO_vfree); | |
465 | return NULL; | |
466 | } | |
467 | ||
468 | /* Get content type */ | |
469 | ||
470 | if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
471 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
472 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); | |
473 | return NULL; | |
474 | } | |
475 | ||
476 | if (strcmp(hdr->value, "application/x-pkcs7-signature") && | |
477 | strcmp(hdr->value, "application/pkcs7-signature")) { | |
478 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE); | |
479 | ERR_add_error_data(2, "type: ", hdr->value); | |
480 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
481 | sk_BIO_pop_free(parts, BIO_vfree); | |
482 | return NULL; | |
483 | } | |
484 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
485 | /* Read in ASN1 */ | |
486 | if (!(val = b64_read_asn1(asnin, it))) { | |
487 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR); | |
488 | sk_BIO_pop_free(parts, BIO_vfree); | |
489 | return NULL; | |
490 | } | |
491 | ||
492 | if (bcont) { | |
493 | *bcont = sk_BIO_value(parts, 0); | |
494 | BIO_free(asnin); | |
495 | sk_BIO_free(parts); | |
496 | } else | |
497 | sk_BIO_pop_free(parts, BIO_vfree); | |
498 | return val; | |
499 | } | |
500 | ||
501 | /* OK, if not multipart/signed try opaque signature */ | |
502 | ||
503 | if (strcmp(hdr->value, "application/x-pkcs7-mime") && | |
504 | strcmp(hdr->value, "application/pkcs7-mime")) { | |
505 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE); | |
506 | ERR_add_error_data(2, "type: ", hdr->value); | |
507 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
508 | return NULL; | |
509 | } | |
510 | ||
511 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
512 | ||
513 | if (!(val = b64_read_asn1(bio, it))) { | |
514 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); | |
515 | return NULL; | |
516 | } | |
517 | return val; | |
8931b30d DSH |
518 | |
519 | } | |
520 | ||
521 | /* Copy text from one BIO to another making the output CRLF at EOL */ | |
522 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags) | |
523 | { | |
0f113f3e MC |
524 | BIO *bf; |
525 | char eol; | |
526 | int len; | |
527 | char linebuf[MAX_SMLEN]; | |
528 | /* | |
529 | * Buffer output so we don't write one line at a time. This is useful | |
530 | * when streaming as we don't end up with one OCTET STRING per line. | |
531 | */ | |
532 | bf = BIO_new(BIO_f_buffer()); | |
533 | if (!bf) | |
534 | return 0; | |
535 | out = BIO_push(bf, out); | |
536 | if (flags & SMIME_BINARY) { | |
537 | while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) | |
538 | BIO_write(out, linebuf, len); | |
539 | } else { | |
540 | int eolcnt = 0; | |
541 | if (flags & SMIME_TEXT) | |
542 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); | |
543 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { | |
544 | eol = strip_eol(linebuf, &len, flags); | |
545 | if (len) { | |
546 | /* Not EOF: write out all CRLF */ | |
547 | if (flags & SMIME_ASCIICRLF) { | |
548 | int i; | |
549 | for (i = 0; i < eolcnt; i++) | |
550 | BIO_write(out, "\r\n", 2); | |
551 | eolcnt = 0; | |
552 | } | |
553 | BIO_write(out, linebuf, len); | |
554 | if (eol) | |
555 | BIO_write(out, "\r\n", 2); | |
556 | } else if (flags & SMIME_ASCIICRLF) | |
557 | eolcnt++; | |
558 | else if (eol) | |
559 | BIO_write(out, "\r\n", 2); | |
560 | } | |
561 | } | |
562 | (void)BIO_flush(out); | |
563 | BIO_pop(out); | |
564 | BIO_free(bf); | |
565 | return 1; | |
8931b30d DSH |
566 | } |
567 | ||
568 | /* Strip off headers if they are text/plain */ | |
569 | int SMIME_text(BIO *in, BIO *out) | |
570 | { | |
0f113f3e MC |
571 | char iobuf[4096]; |
572 | int len; | |
573 | STACK_OF(MIME_HEADER) *headers; | |
574 | MIME_HEADER *hdr; | |
575 | ||
576 | if (!(headers = mime_parse_hdr(in))) { | |
577 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR); | |
578 | return 0; | |
579 | } | |
580 | if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
581 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE); | |
582 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
583 | return 0; | |
584 | } | |
585 | if (strcmp(hdr->value, "text/plain")) { | |
586 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE); | |
587 | ERR_add_error_data(2, "type: ", hdr->value); | |
588 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
589 | return 0; | |
590 | } | |
591 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
592 | while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) | |
593 | BIO_write(out, iobuf, len); | |
594 | if (len < 0) | |
595 | return 0; | |
596 | return 1; | |
8931b30d DSH |
597 | } |
598 | ||
0f113f3e MC |
599 | /* |
600 | * Split a multipart/XXX message body into component parts: result is | |
8931b30d DSH |
601 | * canonical parts in a STACK of bios |
602 | */ | |
603 | ||
604 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) | |
605 | { | |
0f113f3e MC |
606 | char linebuf[MAX_SMLEN]; |
607 | int len, blen; | |
608 | int eol = 0, next_eol = 0; | |
609 | BIO *bpart = NULL; | |
610 | STACK_OF(BIO) *parts; | |
611 | char state, part, first; | |
612 | ||
613 | blen = strlen(bound); | |
614 | part = 0; | |
615 | state = 0; | |
616 | first = 1; | |
617 | parts = sk_BIO_new_null(); | |
618 | *ret = parts; | |
619 | if (*ret == NULL) | |
620 | return 0; | |
621 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
622 | state = mime_bound_check(linebuf, len, bound, blen); | |
623 | if (state == 1) { | |
624 | first = 1; | |
625 | part++; | |
626 | } else if (state == 2) { | |
627 | if (!sk_BIO_push(parts, bpart)) { | |
628 | BIO_free(bpart); | |
629 | return 0; | |
630 | } | |
631 | return 1; | |
632 | } else if (part) { | |
633 | /* Strip CR+LF from linebuf */ | |
634 | next_eol = strip_eol(linebuf, &len, 0); | |
635 | if (first) { | |
636 | first = 0; | |
637 | if (bpart) | |
638 | if (!sk_BIO_push(parts, bpart)) { | |
639 | BIO_free(bpart); | |
640 | return 0; | |
641 | } | |
642 | bpart = BIO_new(BIO_s_mem()); | |
643 | if (bpart == NULL) | |
644 | return 0; | |
645 | BIO_set_mem_eof_return(bpart, 0); | |
646 | } else if (eol) | |
647 | BIO_write(bpart, "\r\n", 2); | |
648 | eol = next_eol; | |
649 | if (len) | |
650 | BIO_write(bpart, linebuf, len); | |
651 | } | |
652 | } | |
ca3a82c3 | 653 | BIO_free(bpart); |
0f113f3e | 654 | return 0; |
8931b30d DSH |
655 | } |
656 | ||
657 | /* This is the big one: parse MIME header lines up to message body */ | |
658 | ||
0f113f3e MC |
659 | #define MIME_INVALID 0 |
660 | #define MIME_START 1 | |
661 | #define MIME_TYPE 2 | |
662 | #define MIME_NAME 3 | |
663 | #define MIME_VALUE 4 | |
664 | #define MIME_QUOTE 5 | |
665 | #define MIME_COMMENT 6 | |
8931b30d DSH |
666 | |
667 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) | |
668 | { | |
0f113f3e MC |
669 | char *p, *q, c; |
670 | char *ntmp; | |
671 | char linebuf[MAX_SMLEN]; | |
672 | MIME_HEADER *mhdr = NULL; | |
673 | STACK_OF(MIME_HEADER) *headers; | |
674 | int len, state, save_state = 0; | |
675 | ||
676 | headers = sk_MIME_HEADER_new(mime_hdr_cmp); | |
677 | if (!headers) | |
678 | return NULL; | |
679 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
680 | /* If whitespace at line start then continuation line */ | |
681 | if (mhdr && isspace((unsigned char)linebuf[0])) | |
682 | state = MIME_NAME; | |
683 | else | |
684 | state = MIME_START; | |
685 | ntmp = NULL; | |
686 | /* Go through all characters */ | |
687 | for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n'); | |
688 | p++) { | |
689 | ||
690 | /* | |
691 | * State machine to handle MIME headers if this looks horrible | |
692 | * that's because it *is* | |
693 | */ | |
694 | ||
695 | switch (state) { | |
696 | case MIME_START: | |
697 | if (c == ':') { | |
698 | state = MIME_TYPE; | |
699 | *p = 0; | |
700 | ntmp = strip_ends(q); | |
701 | q = p + 1; | |
702 | } | |
703 | break; | |
704 | ||
705 | case MIME_TYPE: | |
706 | if (c == ';') { | |
707 | mime_debug("Found End Value\n"); | |
708 | *p = 0; | |
709 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
710 | sk_MIME_HEADER_push(headers, mhdr); | |
711 | ntmp = NULL; | |
712 | q = p + 1; | |
713 | state = MIME_NAME; | |
714 | } else if (c == '(') { | |
715 | save_state = state; | |
716 | state = MIME_COMMENT; | |
717 | } | |
718 | break; | |
719 | ||
720 | case MIME_COMMENT: | |
721 | if (c == ')') { | |
722 | state = save_state; | |
723 | } | |
724 | break; | |
725 | ||
726 | case MIME_NAME: | |
727 | if (c == '=') { | |
728 | state = MIME_VALUE; | |
729 | *p = 0; | |
730 | ntmp = strip_ends(q); | |
731 | q = p + 1; | |
732 | } | |
733 | break; | |
734 | ||
735 | case MIME_VALUE: | |
736 | if (c == ';') { | |
737 | state = MIME_NAME; | |
738 | *p = 0; | |
739 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
740 | ntmp = NULL; | |
741 | q = p + 1; | |
742 | } else if (c == '"') { | |
743 | mime_debug("Found Quote\n"); | |
744 | state = MIME_QUOTE; | |
745 | } else if (c == '(') { | |
746 | save_state = state; | |
747 | state = MIME_COMMENT; | |
748 | } | |
749 | break; | |
750 | ||
751 | case MIME_QUOTE: | |
752 | if (c == '"') { | |
753 | mime_debug("Found Match Quote\n"); | |
754 | state = MIME_VALUE; | |
755 | } | |
756 | break; | |
757 | } | |
758 | } | |
759 | ||
760 | if (state == MIME_TYPE) { | |
761 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
762 | sk_MIME_HEADER_push(headers, mhdr); | |
763 | } else if (state == MIME_VALUE) | |
764 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
765 | if (p == linebuf) | |
766 | break; /* Blank line means end of headers */ | |
767 | } | |
768 | ||
769 | return headers; | |
8931b30d DSH |
770 | |
771 | } | |
772 | ||
773 | static char *strip_ends(char *name) | |
774 | { | |
0f113f3e | 775 | return strip_end(strip_start(name)); |
8931b30d DSH |
776 | } |
777 | ||
778 | /* Strip a parameter of whitespace from start of param */ | |
779 | static char *strip_start(char *name) | |
780 | { | |
0f113f3e MC |
781 | char *p, c; |
782 | /* Look for first non white space or quote */ | |
783 | for (p = name; (c = *p); p++) { | |
784 | if (c == '"') { | |
785 | /* Next char is start of string if non null */ | |
786 | if (p[1]) | |
787 | return p + 1; | |
788 | /* Else null string */ | |
789 | return NULL; | |
790 | } | |
791 | if (!isspace((unsigned char)c)) | |
792 | return p; | |
793 | } | |
794 | return NULL; | |
8931b30d DSH |
795 | } |
796 | ||
797 | /* As above but strip from end of string : maybe should handle brackets? */ | |
798 | static char *strip_end(char *name) | |
799 | { | |
0f113f3e MC |
800 | char *p, c; |
801 | if (!name) | |
802 | return NULL; | |
803 | /* Look for first non white space or quote */ | |
804 | for (p = name + strlen(name) - 1; p >= name; p--) { | |
805 | c = *p; | |
806 | if (c == '"') { | |
807 | if (p - 1 == name) | |
808 | return NULL; | |
809 | *p = 0; | |
810 | return name; | |
811 | } | |
812 | if (isspace((unsigned char)c)) | |
813 | *p = 0; | |
814 | else | |
815 | return name; | |
816 | } | |
817 | return NULL; | |
8931b30d DSH |
818 | } |
819 | ||
820 | static MIME_HEADER *mime_hdr_new(char *name, char *value) | |
821 | { | |
0f113f3e MC |
822 | MIME_HEADER *mhdr = NULL; |
823 | char *tmpname = NULL, *tmpval = NULL, *p; | |
824 | int c; | |
825 | if (name) { | |
826 | if (!(tmpname = BUF_strdup(name))) | |
827 | return NULL; | |
828 | for (p = tmpname; *p; p++) { | |
829 | c = (unsigned char)*p; | |
830 | if (isupper(c)) { | |
831 | c = tolower(c); | |
832 | *p = c; | |
833 | } | |
834 | } | |
835 | } | |
836 | if (value) { | |
837 | if (!(tmpval = BUF_strdup(value))) | |
838 | goto err; | |
839 | for (p = tmpval; *p; p++) { | |
840 | c = (unsigned char)*p; | |
841 | if (isupper(c)) { | |
842 | c = tolower(c); | |
843 | *p = c; | |
844 | } | |
845 | } | |
846 | } | |
b196e7d9 | 847 | mhdr = OPENSSL_malloc(sizeof(MIME_HEADER)); |
0f113f3e MC |
848 | if (!mhdr) |
849 | goto err; | |
850 | mhdr->name = tmpname; | |
851 | mhdr->value = tmpval; | |
852 | if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) | |
853 | goto err; | |
854 | return mhdr; | |
855 | ||
856 | err: | |
857 | if (tmpname != NULL) | |
858 | OPENSSL_free(tmpname); | |
859 | if (tmpval != NULL) | |
860 | OPENSSL_free(tmpval); | |
861 | if (mhdr != NULL) | |
862 | OPENSSL_free(mhdr); | |
863 | return NULL; | |
8931b30d | 864 | } |
0f113f3e | 865 | |
8931b30d DSH |
866 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) |
867 | { | |
0f113f3e MC |
868 | char *tmpname = NULL, *tmpval = NULL, *p; |
869 | int c; | |
870 | MIME_PARAM *mparam = NULL; | |
871 | if (name) { | |
872 | tmpname = BUF_strdup(name); | |
873 | if (!tmpname) | |
874 | goto err; | |
875 | for (p = tmpname; *p; p++) { | |
876 | c = (unsigned char)*p; | |
877 | if (isupper(c)) { | |
878 | c = tolower(c); | |
879 | *p = c; | |
880 | } | |
881 | } | |
882 | } | |
883 | if (value) { | |
884 | tmpval = BUF_strdup(value); | |
885 | if (!tmpval) | |
886 | goto err; | |
887 | } | |
888 | /* Parameter values are case sensitive so leave as is */ | |
b196e7d9 | 889 | mparam = OPENSSL_malloc(sizeof(MIME_PARAM)); |
0f113f3e MC |
890 | if (!mparam) |
891 | goto err; | |
892 | mparam->param_name = tmpname; | |
893 | mparam->param_value = tmpval; | |
894 | if (!sk_MIME_PARAM_push(mhdr->params, mparam)) | |
895 | goto err; | |
896 | return 1; | |
897 | err: | |
898 | if (tmpname != NULL) | |
899 | OPENSSL_free(tmpname); | |
900 | if (tmpval != NULL) | |
901 | OPENSSL_free(tmpval); | |
902 | if (mparam != NULL) | |
903 | OPENSSL_free(mparam); | |
904 | return 0; | |
8931b30d DSH |
905 | } |
906 | ||
0f113f3e MC |
907 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
908 | const MIME_HEADER *const *b) | |
8931b30d | 909 | { |
0f113f3e MC |
910 | if (!(*a)->name || !(*b)->name) |
911 | return ! !(*a)->name - ! !(*b)->name; | |
6941b7b9 | 912 | |
0f113f3e | 913 | return (strcmp((*a)->name, (*b)->name)); |
8931b30d DSH |
914 | } |
915 | ||
0f113f3e MC |
916 | static int mime_param_cmp(const MIME_PARAM *const *a, |
917 | const MIME_PARAM *const *b) | |
8931b30d | 918 | { |
0f113f3e MC |
919 | if (!(*a)->param_name || !(*b)->param_name) |
920 | return ! !(*a)->param_name - ! !(*b)->param_name; | |
921 | return (strcmp((*a)->param_name, (*b)->param_name)); | |
8931b30d DSH |
922 | } |
923 | ||
924 | /* Find a header with a given name (if possible) */ | |
925 | ||
926 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) | |
927 | { | |
0f113f3e MC |
928 | MIME_HEADER htmp; |
929 | int idx; | |
930 | htmp.name = name; | |
931 | idx = sk_MIME_HEADER_find(hdrs, &htmp); | |
932 | if (idx < 0) | |
933 | return NULL; | |
934 | return sk_MIME_HEADER_value(hdrs, idx); | |
8931b30d DSH |
935 | } |
936 | ||
937 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
938 | { | |
0f113f3e MC |
939 | MIME_PARAM param; |
940 | int idx; | |
941 | param.param_name = name; | |
942 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); | |
943 | if (idx < 0) | |
944 | return NULL; | |
945 | return sk_MIME_PARAM_value(hdr->params, idx); | |
8931b30d DSH |
946 | } |
947 | ||
948 | static void mime_hdr_free(MIME_HEADER *hdr) | |
949 | { | |
0f113f3e MC |
950 | if (hdr->name) |
951 | OPENSSL_free(hdr->name); | |
952 | if (hdr->value) | |
953 | OPENSSL_free(hdr->value); | |
954 | if (hdr->params) | |
955 | sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
956 | OPENSSL_free(hdr); | |
8931b30d DSH |
957 | } |
958 | ||
959 | static void mime_param_free(MIME_PARAM *param) | |
960 | { | |
0f113f3e MC |
961 | if (param->param_name) |
962 | OPENSSL_free(param->param_name); | |
963 | if (param->param_value) | |
964 | OPENSSL_free(param->param_value); | |
965 | OPENSSL_free(param); | |
8931b30d DSH |
966 | } |
967 | ||
c80fd6b2 MC |
968 | /*- |
969 | * Check for a multipart boundary. Returns: | |
8931b30d DSH |
970 | * 0 : no boundary |
971 | * 1 : part boundary | |
972 | * 2 : final boundary | |
973 | */ | |
974 | static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
975 | { | |
0f113f3e MC |
976 | if (linelen == -1) |
977 | linelen = strlen(line); | |
978 | if (blen == -1) | |
979 | blen = strlen(bound); | |
980 | /* Quickly eliminate if line length too short */ | |
981 | if (blen + 2 > linelen) | |
982 | return 0; | |
983 | /* Check for part boundary */ | |
984 | if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { | |
985 | if (!strncmp(line + blen + 2, "--", 2)) | |
986 | return 2; | |
987 | else | |
988 | return 1; | |
989 | } | |
990 | return 0; | |
8931b30d DSH |
991 | } |
992 | ||
847865d0 | 993 | static int strip_eol(char *linebuf, int *plen, int flags) |
0f113f3e MC |
994 | { |
995 | int len = *plen; | |
996 | char *p, c; | |
997 | int is_eol = 0; | |
998 | p = linebuf + len - 1; | |
999 | for (p = linebuf + len - 1; len > 0; len--, p--) { | |
1000 | c = *p; | |
1001 | if (c == '\n') | |
1002 | is_eol = 1; | |
1003 | else if (is_eol && flags & SMIME_ASCIICRLF && c < 33) | |
1004 | continue; | |
1005 | else if (c != '\r') | |
1006 | break; | |
1007 | } | |
1008 | *plen = len; | |
1009 | return is_eol; | |
1010 | } |