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