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0f113f3e MC |
1 | /* |
2 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
8931b30d DSH |
3 | * project. |
4 | */ | |
5 | /* ==================================================================== | |
6 | * Copyright (c) 1999-2008 The OpenSSL Project. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 13 | * notice, this list of conditions and the following disclaimer. |
8931b30d DSH |
14 | * |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | */ | |
54 | ||
55 | #include <stdio.h> | |
56 | #include <ctype.h> | |
b39fc560 | 57 | #include "internal/cryptlib.h" |
8931b30d DSH |
58 | #include <openssl/rand.h> |
59 | #include <openssl/x509.h> | |
60 | #include <openssl/asn1.h> | |
61 | #include <openssl/asn1t.h> | |
ab0a14bb | 62 | #include "internal/evp_int.h" |
8931b30d DSH |
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 | ||
4a1f3f27 | 75 | struct mime_param_st { |
0f113f3e MC |
76 | char *param_name; /* Param name e.g. "micalg" */ |
77 | char *param_value; /* Param value e.g. "sha1" */ | |
4a1f3f27 | 78 | }; |
8931b30d | 79 | |
4a1f3f27 | 80 | struct mime_header_st { |
0f113f3e MC |
81 | char *name; /* Name of line e.g. "content-type" */ |
82 | char *value; /* Value of line e.g. "text/plain" */ | |
83 | STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ | |
4a1f3f27 | 84 | }; |
8931b30d DSH |
85 | |
86 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
0f113f3e MC |
87 | const ASN1_ITEM *it); |
88 | static char *strip_ends(char *name); | |
89 | static char *strip_start(char *name); | |
90 | static char *strip_end(char *name); | |
8931b30d DSH |
91 | static MIME_HEADER *mime_hdr_new(char *name, char *value); |
92 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); | |
93 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); | |
0f113f3e MC |
94 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
95 | const MIME_HEADER *const *b); | |
96 | static int mime_param_cmp(const MIME_PARAM *const *a, | |
97 | const MIME_PARAM *const *b); | |
8931b30d DSH |
98 | static void mime_param_free(MIME_PARAM *param); |
99 | static int mime_bound_check(char *line, int linelen, char *bound, int blen); | |
100 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); | |
847865d0 | 101 | static int strip_eol(char *linebuf, int *plen, int flags); |
8931b30d DSH |
102 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); |
103 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); | |
104 | static void mime_hdr_free(MIME_HEADER *hdr); | |
105 | ||
106 | #define MAX_SMLEN 1024 | |
0f113f3e | 107 | #define mime_debug(x) /* x */ |
8931b30d DSH |
108 | |
109 | /* Output an ASN1 structure in BER format streaming if necessary */ | |
110 | ||
111 | int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
112 | const ASN1_ITEM *it) |
113 | { | |
114 | /* If streaming create stream BIO and copy all content through it */ | |
115 | if (flags & SMIME_STREAM) { | |
116 | BIO *bio, *tbio; | |
117 | bio = BIO_new_NDEF(out, val, it); | |
118 | if (!bio) { | |
119 | ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE); | |
120 | return 0; | |
121 | } | |
122 | SMIME_crlf_copy(in, bio, flags); | |
123 | (void)BIO_flush(bio); | |
124 | /* Free up successive BIOs until we hit the old output BIO */ | |
125 | do { | |
126 | tbio = BIO_pop(bio); | |
127 | BIO_free(bio); | |
128 | bio = tbio; | |
129 | } while (bio != out); | |
130 | } | |
131 | /* | |
132 | * else just write out ASN1 structure which will have all content stored | |
133 | * internally | |
134 | */ | |
135 | else | |
136 | ASN1_item_i2d_bio(it, out, val); | |
137 | return 1; | |
138 | } | |
8931b30d DSH |
139 | |
140 | /* Base 64 read and write of ASN1 structure */ | |
141 | ||
142 | static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
143 | const ASN1_ITEM *it) |
144 | { | |
145 | BIO *b64; | |
146 | int r; | |
147 | b64 = BIO_new(BIO_f_base64()); | |
90945fa3 | 148 | if (b64 == NULL) { |
0f113f3e MC |
149 | ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE); |
150 | return 0; | |
151 | } | |
152 | /* | |
153 | * prepend the b64 BIO so all data is base64 encoded. | |
154 | */ | |
155 | out = BIO_push(b64, out); | |
156 | r = i2d_ASN1_bio_stream(out, val, in, flags, it); | |
157 | (void)BIO_flush(out); | |
158 | BIO_pop(out); | |
159 | BIO_free(b64); | |
160 | return r; | |
161 | } | |
8931b30d DSH |
162 | |
163 | /* Streaming ASN1 PEM write */ | |
164 | ||
165 | int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
166 | const char *hdr, const ASN1_ITEM *it) |
167 | { | |
168 | int r; | |
169 | BIO_printf(out, "-----BEGIN %s-----\n", hdr); | |
170 | r = B64_write_ASN1(out, val, in, flags, it); | |
171 | BIO_printf(out, "-----END %s-----\n", hdr); | |
172 | return r; | |
173 | } | |
8931b30d DSH |
174 | |
175 | static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) | |
176 | { | |
0f113f3e MC |
177 | BIO *b64; |
178 | ASN1_VALUE *val; | |
75ebbd9a RS |
179 | |
180 | if ((b64 = BIO_new(BIO_f_base64())) == NULL) { | |
0f113f3e MC |
181 | ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE); |
182 | return 0; | |
183 | } | |
184 | bio = BIO_push(b64, bio); | |
185 | val = ASN1_item_d2i_bio(it, bio, NULL); | |
186 | if (!val) | |
187 | ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR); | |
188 | (void)BIO_flush(bio); | |
189 | bio = BIO_pop(bio); | |
190 | BIO_free(b64); | |
191 | return val; | |
8931b30d DSH |
192 | } |
193 | ||
194 | /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ | |
195 | ||
196 | static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) | |
0f113f3e MC |
197 | { |
198 | const EVP_MD *md; | |
199 | int i, have_unknown = 0, write_comma, ret = 0, md_nid; | |
200 | have_unknown = 0; | |
201 | write_comma = 0; | |
202 | for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) { | |
203 | if (write_comma) | |
204 | BIO_write(out, ",", 1); | |
205 | write_comma = 1; | |
206 | md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); | |
207 | md = EVP_get_digestbynid(md_nid); | |
208 | if (md && md->md_ctrl) { | |
209 | int rv; | |
210 | char *micstr; | |
211 | rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); | |
212 | if (rv > 0) { | |
213 | BIO_puts(out, micstr); | |
214 | OPENSSL_free(micstr); | |
215 | continue; | |
216 | } | |
217 | if (rv != -2) | |
218 | goto err; | |
219 | } | |
220 | switch (md_nid) { | |
221 | case NID_sha1: | |
222 | BIO_puts(out, "sha1"); | |
223 | break; | |
224 | ||
225 | case NID_md5: | |
226 | BIO_puts(out, "md5"); | |
227 | break; | |
228 | ||
229 | case NID_sha256: | |
230 | BIO_puts(out, "sha-256"); | |
231 | break; | |
232 | ||
233 | case NID_sha384: | |
234 | BIO_puts(out, "sha-384"); | |
235 | break; | |
236 | ||
237 | case NID_sha512: | |
238 | BIO_puts(out, "sha-512"); | |
239 | break; | |
240 | ||
241 | case NID_id_GostR3411_94: | |
242 | BIO_puts(out, "gostr3411-94"); | |
243 | goto err; | |
0f113f3e MC |
244 | |
245 | default: | |
246 | if (have_unknown) | |
247 | write_comma = 0; | |
248 | else { | |
249 | BIO_puts(out, "unknown"); | |
250 | have_unknown = 1; | |
251 | } | |
252 | break; | |
253 | ||
254 | } | |
255 | } | |
256 | ||
257 | ret = 1; | |
258 | err: | |
259 | ||
260 | return ret; | |
261 | ||
262 | } | |
8931b30d DSH |
263 | |
264 | /* SMIME sender */ | |
265 | ||
266 | int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, | |
0f113f3e MC |
267 | int ctype_nid, int econt_nid, |
268 | STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it) | |
8931b30d | 269 | { |
0f113f3e MC |
270 | char bound[33], c; |
271 | int i; | |
272 | const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; | |
273 | const char *msg_type = NULL; | |
274 | if (flags & SMIME_OLDMIME) | |
275 | mime_prefix = "application/x-pkcs7-"; | |
276 | else | |
277 | mime_prefix = "application/pkcs7-"; | |
278 | ||
279 | if (flags & SMIME_CRLFEOL) | |
280 | mime_eol = "\r\n"; | |
281 | else | |
282 | mime_eol = "\n"; | |
283 | if ((flags & SMIME_DETACHED) && data) { | |
284 | /* We want multipart/signed */ | |
285 | /* Generate a random boundary */ | |
266483d2 MC |
286 | if (RAND_bytes((unsigned char *)bound, 32) <= 0) |
287 | return 0; | |
0f113f3e MC |
288 | for (i = 0; i < 32; i++) { |
289 | c = bound[i] & 0xf; | |
290 | if (c < 10) | |
291 | c += '0'; | |
292 | else | |
293 | c += 'A' - 10; | |
294 | bound[i] = c; | |
295 | } | |
296 | bound[32] = 0; | |
297 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
298 | BIO_printf(bio, "Content-Type: multipart/signed;"); | |
299 | BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); | |
300 | BIO_puts(bio, " micalg=\""); | |
301 | asn1_write_micalg(bio, mdalgs); | |
302 | BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", | |
303 | bound, mime_eol, mime_eol); | |
304 | BIO_printf(bio, "This is an S/MIME signed message%s%s", | |
305 | mime_eol, mime_eol); | |
306 | /* Now write out the first part */ | |
307 | BIO_printf(bio, "------%s%s", bound, mime_eol); | |
308 | if (!asn1_output_data(bio, data, val, flags, it)) | |
309 | return 0; | |
310 | BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); | |
311 | ||
312 | /* Headers for signature */ | |
313 | ||
314 | BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); | |
315 | BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); | |
316 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol); | |
317 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
318 | BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol); | |
319 | B64_write_ASN1(bio, val, NULL, 0, it); | |
320 | BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound, | |
321 | mime_eol, mime_eol); | |
322 | return 1; | |
323 | } | |
324 | ||
325 | /* Determine smime-type header */ | |
326 | ||
327 | if (ctype_nid == NID_pkcs7_enveloped) | |
328 | msg_type = "enveloped-data"; | |
329 | else if (ctype_nid == NID_pkcs7_signed) { | |
330 | if (econt_nid == NID_id_smime_ct_receipt) | |
331 | msg_type = "signed-receipt"; | |
332 | else if (sk_X509_ALGOR_num(mdalgs) >= 0) | |
333 | msg_type = "signed-data"; | |
334 | else | |
335 | msg_type = "certs-only"; | |
336 | } else if (ctype_nid == NID_id_smime_ct_compressedData) { | |
337 | msg_type = "compressed-data"; | |
338 | cname = "smime.p7z"; | |
339 | } | |
340 | /* MIME headers */ | |
341 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
342 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
343 | BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); | |
344 | BIO_printf(bio, "Content-Type: %smime;", mime_prefix); | |
345 | if (msg_type) | |
346 | BIO_printf(bio, " smime-type=%s;", msg_type); | |
347 | BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); | |
348 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", | |
349 | mime_eol, mime_eol); | |
350 | if (!B64_write_ASN1(bio, val, data, flags, it)) | |
351 | return 0; | |
352 | BIO_printf(bio, "%s", mime_eol); | |
353 | return 1; | |
8931b30d DSH |
354 | } |
355 | ||
356 | /* Handle output of ASN1 data */ | |
357 | ||
8931b30d | 358 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, |
0f113f3e MC |
359 | const ASN1_ITEM *it) |
360 | { | |
361 | BIO *tmpbio; | |
362 | const ASN1_AUX *aux = it->funcs; | |
363 | ASN1_STREAM_ARG sarg; | |
364 | int rv = 1; | |
365 | ||
366 | /* | |
0d4fb843 | 367 | * If data is not detached or resigning then the output BIO is already |
0f113f3e MC |
368 | * set up to finalise when it is written through. |
369 | */ | |
370 | if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) { | |
371 | SMIME_crlf_copy(data, out, flags); | |
372 | return 1; | |
373 | } | |
374 | ||
375 | if (!aux || !aux->asn1_cb) { | |
376 | ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED); | |
377 | return 0; | |
378 | } | |
379 | ||
380 | sarg.out = out; | |
381 | sarg.ndef_bio = NULL; | |
382 | sarg.boundary = NULL; | |
383 | ||
384 | /* Let ASN1 code prepend any needed BIOs */ | |
385 | ||
386 | if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) | |
387 | return 0; | |
388 | ||
389 | /* Copy data across, passing through filter BIOs for processing */ | |
390 | SMIME_crlf_copy(data, sarg.ndef_bio, flags); | |
391 | ||
392 | /* Finalize structure */ | |
393 | if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) | |
394 | rv = 0; | |
395 | ||
396 | /* Now remove any digests prepended to the BIO */ | |
397 | ||
398 | while (sarg.ndef_bio != out) { | |
399 | tmpbio = BIO_pop(sarg.ndef_bio); | |
400 | BIO_free(sarg.ndef_bio); | |
401 | sarg.ndef_bio = tmpbio; | |
402 | } | |
403 | ||
404 | return rv; | |
405 | ||
406 | } | |
407 | ||
408 | /* | |
409 | * SMIME reader: handle multipart/signed and opaque signing. in multipart | |
410 | * case the content is placed in a memory BIO pointed to by "bcont". In | |
411 | * opaque this is set to NULL | |
8931b30d DSH |
412 | */ |
413 | ||
2e86f0d8 | 414 | ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) |
8931b30d | 415 | { |
0f113f3e MC |
416 | BIO *asnin; |
417 | STACK_OF(MIME_HEADER) *headers = NULL; | |
418 | STACK_OF(BIO) *parts = NULL; | |
419 | MIME_HEADER *hdr; | |
420 | MIME_PARAM *prm; | |
421 | ASN1_VALUE *val; | |
422 | int ret; | |
423 | ||
424 | if (bcont) | |
425 | *bcont = NULL; | |
426 | ||
75ebbd9a | 427 | if ((headers = mime_parse_hdr(bio)) == NULL) { |
0f113f3e MC |
428 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR); |
429 | return NULL; | |
430 | } | |
431 | ||
75ebbd9a RS |
432 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
433 | || hdr->value == NULL) { | |
0f113f3e MC |
434 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
435 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); | |
436 | return NULL; | |
437 | } | |
438 | ||
439 | /* Handle multipart/signed */ | |
440 | ||
86885c28 | 441 | if (strcmp(hdr->value, "multipart/signed") == 0) { |
0f113f3e MC |
442 | /* Split into two parts */ |
443 | prm = mime_param_find(hdr, "boundary"); | |
444 | if (!prm || !prm->param_value) { | |
445 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
446 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); | |
447 | return NULL; | |
448 | } | |
449 | ret = multi_split(bio, prm->param_value, &parts); | |
450 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
451 | if (!ret || (sk_BIO_num(parts) != 2)) { | |
452 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); | |
453 | sk_BIO_pop_free(parts, BIO_vfree); | |
454 | return NULL; | |
455 | } | |
456 | ||
457 | /* Parse the signature piece */ | |
458 | asnin = sk_BIO_value(parts, 1); | |
459 | ||
75ebbd9a | 460 | if ((headers = mime_parse_hdr(asnin)) == NULL) { |
0f113f3e MC |
461 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR); |
462 | sk_BIO_pop_free(parts, BIO_vfree); | |
463 | return NULL; | |
464 | } | |
465 | ||
466 | /* Get content type */ | |
467 | ||
75ebbd9a RS |
468 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
469 | || hdr->value == NULL) { | |
0f113f3e MC |
470 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
471 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); | |
472 | return NULL; | |
473 | } | |
474 | ||
475 | if (strcmp(hdr->value, "application/x-pkcs7-signature") && | |
476 | strcmp(hdr->value, "application/pkcs7-signature")) { | |
477 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE); | |
478 | ERR_add_error_data(2, "type: ", hdr->value); | |
479 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
480 | sk_BIO_pop_free(parts, BIO_vfree); | |
481 | return NULL; | |
482 | } | |
483 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
484 | /* Read in ASN1 */ | |
75ebbd9a | 485 | if ((val = b64_read_asn1(asnin, it)) == NULL) { |
0f113f3e MC |
486 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR); |
487 | sk_BIO_pop_free(parts, BIO_vfree); | |
488 | return NULL; | |
489 | } | |
490 | ||
491 | if (bcont) { | |
492 | *bcont = sk_BIO_value(parts, 0); | |
493 | BIO_free(asnin); | |
494 | sk_BIO_free(parts); | |
495 | } else | |
496 | sk_BIO_pop_free(parts, BIO_vfree); | |
497 | return val; | |
498 | } | |
499 | ||
500 | /* OK, if not multipart/signed try opaque signature */ | |
501 | ||
502 | if (strcmp(hdr->value, "application/x-pkcs7-mime") && | |
503 | strcmp(hdr->value, "application/pkcs7-mime")) { | |
504 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE); | |
505 | ERR_add_error_data(2, "type: ", hdr->value); | |
506 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
507 | return NULL; | |
508 | } | |
509 | ||
510 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
511 | ||
75ebbd9a | 512 | if ((val = b64_read_asn1(bio, it)) == NULL) { |
0f113f3e MC |
513 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); |
514 | return NULL; | |
515 | } | |
516 | return val; | |
8931b30d DSH |
517 | |
518 | } | |
519 | ||
520 | /* Copy text from one BIO to another making the output CRLF at EOL */ | |
521 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags) | |
522 | { | |
0f113f3e MC |
523 | BIO *bf; |
524 | char eol; | |
525 | int len; | |
526 | char linebuf[MAX_SMLEN]; | |
527 | /* | |
528 | * Buffer output so we don't write one line at a time. This is useful | |
529 | * when streaming as we don't end up with one OCTET STRING per line. | |
530 | */ | |
531 | bf = BIO_new(BIO_f_buffer()); | |
90945fa3 | 532 | if (bf == NULL) |
0f113f3e MC |
533 | return 0; |
534 | out = BIO_push(bf, out); | |
535 | if (flags & SMIME_BINARY) { | |
536 | while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) | |
537 | BIO_write(out, linebuf, len); | |
538 | } else { | |
539 | int eolcnt = 0; | |
540 | if (flags & SMIME_TEXT) | |
541 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); | |
542 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { | |
543 | eol = strip_eol(linebuf, &len, flags); | |
544 | if (len) { | |
545 | /* Not EOF: write out all CRLF */ | |
546 | if (flags & SMIME_ASCIICRLF) { | |
547 | int i; | |
548 | for (i = 0; i < eolcnt; i++) | |
549 | BIO_write(out, "\r\n", 2); | |
550 | eolcnt = 0; | |
551 | } | |
552 | BIO_write(out, linebuf, len); | |
553 | if (eol) | |
554 | BIO_write(out, "\r\n", 2); | |
555 | } else if (flags & SMIME_ASCIICRLF) | |
556 | eolcnt++; | |
557 | else if (eol) | |
558 | BIO_write(out, "\r\n", 2); | |
559 | } | |
560 | } | |
561 | (void)BIO_flush(out); | |
562 | BIO_pop(out); | |
563 | BIO_free(bf); | |
564 | return 1; | |
8931b30d DSH |
565 | } |
566 | ||
567 | /* Strip off headers if they are text/plain */ | |
568 | int SMIME_text(BIO *in, BIO *out) | |
569 | { | |
0f113f3e MC |
570 | char iobuf[4096]; |
571 | int len; | |
572 | STACK_OF(MIME_HEADER) *headers; | |
573 | MIME_HEADER *hdr; | |
574 | ||
75ebbd9a | 575 | if ((headers = mime_parse_hdr(in)) == NULL) { |
0f113f3e MC |
576 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR); |
577 | return 0; | |
578 | } | |
75ebbd9a RS |
579 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
580 | || hdr->value == NULL) { | |
0f113f3e MC |
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); | |
90945fa3 | 677 | if (headers == NULL) |
0f113f3e MC |
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; | |
75ebbd9a | 825 | |
0f113f3e | 826 | if (name) { |
7644a9ae | 827 | if ((tmpname = OPENSSL_strdup(name)) == NULL) |
0f113f3e MC |
828 | return NULL; |
829 | for (p = tmpname; *p; p++) { | |
830 | c = (unsigned char)*p; | |
831 | if (isupper(c)) { | |
832 | c = tolower(c); | |
833 | *p = c; | |
834 | } | |
835 | } | |
836 | } | |
837 | if (value) { | |
7644a9ae | 838 | if ((tmpval = OPENSSL_strdup(value)) == NULL) |
0f113f3e MC |
839 | goto err; |
840 | for (p = tmpval; *p; p++) { | |
841 | c = (unsigned char)*p; | |
842 | if (isupper(c)) { | |
843 | c = tolower(c); | |
844 | *p = c; | |
845 | } | |
846 | } | |
847 | } | |
b4faea50 | 848 | mhdr = OPENSSL_malloc(sizeof(*mhdr)); |
90945fa3 | 849 | if (mhdr == NULL) |
0f113f3e MC |
850 | goto err; |
851 | mhdr->name = tmpname; | |
852 | mhdr->value = tmpval; | |
75ebbd9a | 853 | if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL) |
0f113f3e MC |
854 | goto err; |
855 | return mhdr; | |
856 | ||
857 | err: | |
b548a1f1 RS |
858 | OPENSSL_free(tmpname); |
859 | OPENSSL_free(tmpval); | |
860 | OPENSSL_free(mhdr); | |
0f113f3e | 861 | return NULL; |
8931b30d | 862 | } |
0f113f3e | 863 | |
8931b30d DSH |
864 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) |
865 | { | |
0f113f3e MC |
866 | char *tmpname = NULL, *tmpval = NULL, *p; |
867 | int c; | |
868 | MIME_PARAM *mparam = NULL; | |
869 | if (name) { | |
7644a9ae | 870 | tmpname = OPENSSL_strdup(name); |
0f113f3e MC |
871 | if (!tmpname) |
872 | goto err; | |
873 | for (p = tmpname; *p; p++) { | |
874 | c = (unsigned char)*p; | |
875 | if (isupper(c)) { | |
876 | c = tolower(c); | |
877 | *p = c; | |
878 | } | |
879 | } | |
880 | } | |
881 | if (value) { | |
7644a9ae | 882 | tmpval = OPENSSL_strdup(value); |
0f113f3e MC |
883 | if (!tmpval) |
884 | goto err; | |
885 | } | |
886 | /* Parameter values are case sensitive so leave as is */ | |
b4faea50 | 887 | mparam = OPENSSL_malloc(sizeof(*mparam)); |
90945fa3 | 888 | if (mparam == NULL) |
0f113f3e MC |
889 | goto err; |
890 | mparam->param_name = tmpname; | |
891 | mparam->param_value = tmpval; | |
892 | if (!sk_MIME_PARAM_push(mhdr->params, mparam)) | |
893 | goto err; | |
894 | return 1; | |
895 | err: | |
b548a1f1 RS |
896 | OPENSSL_free(tmpname); |
897 | OPENSSL_free(tmpval); | |
898 | OPENSSL_free(mparam); | |
0f113f3e | 899 | return 0; |
8931b30d DSH |
900 | } |
901 | ||
0f113f3e MC |
902 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
903 | const MIME_HEADER *const *b) | |
8931b30d | 904 | { |
0f113f3e MC |
905 | if (!(*a)->name || !(*b)->name) |
906 | return ! !(*a)->name - ! !(*b)->name; | |
6941b7b9 | 907 | |
0f113f3e | 908 | return (strcmp((*a)->name, (*b)->name)); |
8931b30d DSH |
909 | } |
910 | ||
0f113f3e MC |
911 | static int mime_param_cmp(const MIME_PARAM *const *a, |
912 | const MIME_PARAM *const *b) | |
8931b30d | 913 | { |
0f113f3e MC |
914 | if (!(*a)->param_name || !(*b)->param_name) |
915 | return ! !(*a)->param_name - ! !(*b)->param_name; | |
916 | return (strcmp((*a)->param_name, (*b)->param_name)); | |
8931b30d DSH |
917 | } |
918 | ||
919 | /* Find a header with a given name (if possible) */ | |
920 | ||
921 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) | |
922 | { | |
0f113f3e MC |
923 | MIME_HEADER htmp; |
924 | int idx; | |
925 | htmp.name = name; | |
926 | idx = sk_MIME_HEADER_find(hdrs, &htmp); | |
927 | if (idx < 0) | |
928 | return NULL; | |
929 | return sk_MIME_HEADER_value(hdrs, idx); | |
8931b30d DSH |
930 | } |
931 | ||
932 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
933 | { | |
0f113f3e MC |
934 | MIME_PARAM param; |
935 | int idx; | |
936 | param.param_name = name; | |
937 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); | |
938 | if (idx < 0) | |
939 | return NULL; | |
940 | return sk_MIME_PARAM_value(hdr->params, idx); | |
8931b30d DSH |
941 | } |
942 | ||
943 | static void mime_hdr_free(MIME_HEADER *hdr) | |
944 | { | |
b548a1f1 RS |
945 | OPENSSL_free(hdr->name); |
946 | OPENSSL_free(hdr->value); | |
0f113f3e MC |
947 | if (hdr->params) |
948 | sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
949 | OPENSSL_free(hdr); | |
8931b30d DSH |
950 | } |
951 | ||
952 | static void mime_param_free(MIME_PARAM *param) | |
953 | { | |
b548a1f1 RS |
954 | OPENSSL_free(param->param_name); |
955 | OPENSSL_free(param->param_value); | |
0f113f3e | 956 | OPENSSL_free(param); |
8931b30d DSH |
957 | } |
958 | ||
c80fd6b2 MC |
959 | /*- |
960 | * Check for a multipart boundary. Returns: | |
8931b30d DSH |
961 | * 0 : no boundary |
962 | * 1 : part boundary | |
963 | * 2 : final boundary | |
964 | */ | |
965 | static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
966 | { | |
0f113f3e MC |
967 | if (linelen == -1) |
968 | linelen = strlen(line); | |
969 | if (blen == -1) | |
970 | blen = strlen(bound); | |
971 | /* Quickly eliminate if line length too short */ | |
972 | if (blen + 2 > linelen) | |
973 | return 0; | |
974 | /* Check for part boundary */ | |
86885c28 RS |
975 | if ((strncmp(line, "--", 2) == 0) |
976 | && strncmp(line + 2, bound, blen) == 0) { | |
977 | if (strncmp(line + blen + 2, "--", 2) == 0) | |
0f113f3e MC |
978 | return 2; |
979 | else | |
980 | return 1; | |
981 | } | |
982 | return 0; | |
8931b30d DSH |
983 | } |
984 | ||
847865d0 | 985 | static int strip_eol(char *linebuf, int *plen, int flags) |
0f113f3e MC |
986 | { |
987 | int len = *plen; | |
988 | char *p, c; | |
989 | int is_eol = 0; | |
990 | p = linebuf + len - 1; | |
991 | for (p = linebuf + len - 1; len > 0; len--, p--) { | |
992 | c = *p; | |
993 | if (c == '\n') | |
994 | is_eol = 1; | |
995 | else if (is_eol && flags & SMIME_ASCIICRLF && c < 33) | |
996 | continue; | |
997 | else if (c != '\r') | |
998 | break; | |
999 | } | |
1000 | *plen = len; | |
1001 | return is_eol; | |
1002 | } |