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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" |
a146ae55 | 63 | #include "internal/bio.h" |
8931b30d DSH |
64 | #include "asn1_locl.h" |
65 | ||
0f113f3e MC |
66 | /* |
67 | * Generalised MIME like utilities for streaming ASN1. Although many have a | |
68 | * PKCS7/CMS like flavour others are more general purpose. | |
8931b30d DSH |
69 | */ |
70 | ||
0f113f3e MC |
71 | /* |
72 | * MIME format structures Note that all are translated to lower case apart | |
73 | * from parameter values. Quotes are stripped off | |
8931b30d DSH |
74 | */ |
75 | ||
4a1f3f27 | 76 | struct mime_param_st { |
0f113f3e MC |
77 | char *param_name; /* Param name e.g. "micalg" */ |
78 | char *param_value; /* Param value e.g. "sha1" */ | |
4a1f3f27 | 79 | }; |
8931b30d | 80 | |
4a1f3f27 | 81 | struct mime_header_st { |
0f113f3e MC |
82 | char *name; /* Name of line e.g. "content-type" */ |
83 | char *value; /* Value of line e.g. "text/plain" */ | |
84 | STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ | |
4a1f3f27 | 85 | }; |
8931b30d DSH |
86 | |
87 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
0f113f3e MC |
88 | const ASN1_ITEM *it); |
89 | static char *strip_ends(char *name); | |
90 | static char *strip_start(char *name); | |
91 | static char *strip_end(char *name); | |
8931b30d DSH |
92 | static MIME_HEADER *mime_hdr_new(char *name, char *value); |
93 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); | |
94 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); | |
0f113f3e MC |
95 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
96 | const MIME_HEADER *const *b); | |
97 | static int mime_param_cmp(const MIME_PARAM *const *a, | |
98 | const MIME_PARAM *const *b); | |
8931b30d DSH |
99 | static void mime_param_free(MIME_PARAM *param); |
100 | static int mime_bound_check(char *line, int linelen, char *bound, int blen); | |
101 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); | |
847865d0 | 102 | static int strip_eol(char *linebuf, int *plen, int flags); |
8931b30d DSH |
103 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); |
104 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); | |
105 | static void mime_hdr_free(MIME_HEADER *hdr); | |
106 | ||
107 | #define MAX_SMLEN 1024 | |
0f113f3e | 108 | #define mime_debug(x) /* x */ |
8931b30d DSH |
109 | |
110 | /* Output an ASN1 structure in BER format streaming if necessary */ | |
111 | ||
112 | int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
113 | const ASN1_ITEM *it) |
114 | { | |
115 | /* If streaming create stream BIO and copy all content through it */ | |
116 | if (flags & SMIME_STREAM) { | |
117 | BIO *bio, *tbio; | |
118 | bio = BIO_new_NDEF(out, val, it); | |
119 | if (!bio) { | |
120 | ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE); | |
121 | return 0; | |
122 | } | |
123 | SMIME_crlf_copy(in, bio, flags); | |
124 | (void)BIO_flush(bio); | |
125 | /* Free up successive BIOs until we hit the old output BIO */ | |
126 | do { | |
127 | tbio = BIO_pop(bio); | |
128 | BIO_free(bio); | |
129 | bio = tbio; | |
130 | } while (bio != out); | |
131 | } | |
132 | /* | |
133 | * else just write out ASN1 structure which will have all content stored | |
134 | * internally | |
135 | */ | |
136 | else | |
137 | ASN1_item_i2d_bio(it, out, val); | |
138 | return 1; | |
139 | } | |
8931b30d DSH |
140 | |
141 | /* Base 64 read and write of ASN1 structure */ | |
142 | ||
143 | static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
144 | const ASN1_ITEM *it) |
145 | { | |
146 | BIO *b64; | |
147 | int r; | |
148 | b64 = BIO_new(BIO_f_base64()); | |
90945fa3 | 149 | if (b64 == NULL) { |
0f113f3e MC |
150 | ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE); |
151 | return 0; | |
152 | } | |
153 | /* | |
154 | * prepend the b64 BIO so all data is base64 encoded. | |
155 | */ | |
156 | out = BIO_push(b64, out); | |
157 | r = i2d_ASN1_bio_stream(out, val, in, flags, it); | |
158 | (void)BIO_flush(out); | |
159 | BIO_pop(out); | |
160 | BIO_free(b64); | |
161 | return r; | |
162 | } | |
8931b30d DSH |
163 | |
164 | /* Streaming ASN1 PEM write */ | |
165 | ||
166 | int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
167 | const char *hdr, const ASN1_ITEM *it) |
168 | { | |
169 | int r; | |
170 | BIO_printf(out, "-----BEGIN %s-----\n", hdr); | |
171 | r = B64_write_ASN1(out, val, in, flags, it); | |
172 | BIO_printf(out, "-----END %s-----\n", hdr); | |
173 | return r; | |
174 | } | |
8931b30d DSH |
175 | |
176 | static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) | |
177 | { | |
0f113f3e MC |
178 | BIO *b64; |
179 | ASN1_VALUE *val; | |
75ebbd9a RS |
180 | |
181 | if ((b64 = BIO_new(BIO_f_base64())) == NULL) { | |
0f113f3e MC |
182 | ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE); |
183 | return 0; | |
184 | } | |
185 | bio = BIO_push(b64, bio); | |
186 | val = ASN1_item_d2i_bio(it, bio, NULL); | |
187 | if (!val) | |
188 | ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR); | |
189 | (void)BIO_flush(bio); | |
d278284e | 190 | BIO_pop(bio); |
0f113f3e MC |
191 | BIO_free(b64); |
192 | return val; | |
8931b30d DSH |
193 | } |
194 | ||
195 | /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ | |
196 | ||
197 | static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) | |
0f113f3e MC |
198 | { |
199 | const EVP_MD *md; | |
200 | int i, have_unknown = 0, write_comma, ret = 0, md_nid; | |
201 | have_unknown = 0; | |
202 | write_comma = 0; | |
203 | for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) { | |
204 | if (write_comma) | |
205 | BIO_write(out, ",", 1); | |
206 | write_comma = 1; | |
207 | md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); | |
208 | md = EVP_get_digestbynid(md_nid); | |
209 | if (md && md->md_ctrl) { | |
210 | int rv; | |
211 | char *micstr; | |
212 | rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); | |
213 | if (rv > 0) { | |
214 | BIO_puts(out, micstr); | |
215 | OPENSSL_free(micstr); | |
216 | continue; | |
217 | } | |
218 | if (rv != -2) | |
219 | goto err; | |
220 | } | |
221 | switch (md_nid) { | |
222 | case NID_sha1: | |
223 | BIO_puts(out, "sha1"); | |
224 | break; | |
225 | ||
226 | case NID_md5: | |
227 | BIO_puts(out, "md5"); | |
228 | break; | |
229 | ||
230 | case NID_sha256: | |
231 | BIO_puts(out, "sha-256"); | |
232 | break; | |
233 | ||
234 | case NID_sha384: | |
235 | BIO_puts(out, "sha-384"); | |
236 | break; | |
237 | ||
238 | case NID_sha512: | |
239 | BIO_puts(out, "sha-512"); | |
240 | break; | |
241 | ||
242 | case NID_id_GostR3411_94: | |
243 | BIO_puts(out, "gostr3411-94"); | |
244 | goto err; | |
0f113f3e MC |
245 | |
246 | default: | |
247 | if (have_unknown) | |
248 | write_comma = 0; | |
249 | else { | |
250 | BIO_puts(out, "unknown"); | |
251 | have_unknown = 1; | |
252 | } | |
253 | break; | |
254 | ||
255 | } | |
256 | } | |
257 | ||
258 | ret = 1; | |
259 | err: | |
260 | ||
261 | return ret; | |
262 | ||
263 | } | |
8931b30d DSH |
264 | |
265 | /* SMIME sender */ | |
266 | ||
267 | int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, | |
0f113f3e MC |
268 | int ctype_nid, int econt_nid, |
269 | STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it) | |
8931b30d | 270 | { |
0f113f3e MC |
271 | char bound[33], c; |
272 | int i; | |
273 | const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; | |
274 | const char *msg_type = NULL; | |
275 | if (flags & SMIME_OLDMIME) | |
276 | mime_prefix = "application/x-pkcs7-"; | |
277 | else | |
278 | mime_prefix = "application/pkcs7-"; | |
279 | ||
280 | if (flags & SMIME_CRLFEOL) | |
281 | mime_eol = "\r\n"; | |
282 | else | |
283 | mime_eol = "\n"; | |
284 | if ((flags & SMIME_DETACHED) && data) { | |
285 | /* We want multipart/signed */ | |
286 | /* Generate a random boundary */ | |
266483d2 MC |
287 | if (RAND_bytes((unsigned char *)bound, 32) <= 0) |
288 | return 0; | |
0f113f3e MC |
289 | for (i = 0; i < 32; i++) { |
290 | c = bound[i] & 0xf; | |
291 | if (c < 10) | |
292 | c += '0'; | |
293 | else | |
294 | c += 'A' - 10; | |
295 | bound[i] = c; | |
296 | } | |
297 | bound[32] = 0; | |
298 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
299 | BIO_printf(bio, "Content-Type: multipart/signed;"); | |
300 | BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); | |
301 | BIO_puts(bio, " micalg=\""); | |
302 | asn1_write_micalg(bio, mdalgs); | |
303 | BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", | |
304 | bound, mime_eol, mime_eol); | |
305 | BIO_printf(bio, "This is an S/MIME signed message%s%s", | |
306 | mime_eol, mime_eol); | |
307 | /* Now write out the first part */ | |
308 | BIO_printf(bio, "------%s%s", bound, mime_eol); | |
309 | if (!asn1_output_data(bio, data, val, flags, it)) | |
310 | return 0; | |
311 | BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); | |
312 | ||
313 | /* Headers for signature */ | |
314 | ||
315 | BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); | |
316 | BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); | |
317 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol); | |
318 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
319 | BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol); | |
320 | B64_write_ASN1(bio, val, NULL, 0, it); | |
321 | BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound, | |
322 | mime_eol, mime_eol); | |
323 | return 1; | |
324 | } | |
325 | ||
326 | /* Determine smime-type header */ | |
327 | ||
328 | if (ctype_nid == NID_pkcs7_enveloped) | |
329 | msg_type = "enveloped-data"; | |
330 | else if (ctype_nid == NID_pkcs7_signed) { | |
331 | if (econt_nid == NID_id_smime_ct_receipt) | |
332 | msg_type = "signed-receipt"; | |
333 | else if (sk_X509_ALGOR_num(mdalgs) >= 0) | |
334 | msg_type = "signed-data"; | |
335 | else | |
336 | msg_type = "certs-only"; | |
337 | } else if (ctype_nid == NID_id_smime_ct_compressedData) { | |
338 | msg_type = "compressed-data"; | |
339 | cname = "smime.p7z"; | |
340 | } | |
341 | /* MIME headers */ | |
342 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
343 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
344 | BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); | |
345 | BIO_printf(bio, "Content-Type: %smime;", mime_prefix); | |
346 | if (msg_type) | |
347 | BIO_printf(bio, " smime-type=%s;", msg_type); | |
348 | BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); | |
349 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", | |
350 | mime_eol, mime_eol); | |
351 | if (!B64_write_ASN1(bio, val, data, flags, it)) | |
352 | return 0; | |
353 | BIO_printf(bio, "%s", mime_eol); | |
354 | return 1; | |
8931b30d DSH |
355 | } |
356 | ||
357 | /* Handle output of ASN1 data */ | |
358 | ||
8931b30d | 359 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, |
0f113f3e MC |
360 | const ASN1_ITEM *it) |
361 | { | |
362 | BIO *tmpbio; | |
363 | const ASN1_AUX *aux = it->funcs; | |
364 | ASN1_STREAM_ARG sarg; | |
365 | int rv = 1; | |
366 | ||
367 | /* | |
0d4fb843 | 368 | * If data is not detached or resigning then the output BIO is already |
0f113f3e MC |
369 | * set up to finalise when it is written through. |
370 | */ | |
371 | if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) { | |
372 | SMIME_crlf_copy(data, out, flags); | |
373 | return 1; | |
374 | } | |
375 | ||
376 | if (!aux || !aux->asn1_cb) { | |
377 | ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | sarg.out = out; | |
382 | sarg.ndef_bio = NULL; | |
383 | sarg.boundary = NULL; | |
384 | ||
385 | /* Let ASN1 code prepend any needed BIOs */ | |
386 | ||
387 | if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) | |
388 | return 0; | |
389 | ||
390 | /* Copy data across, passing through filter BIOs for processing */ | |
391 | SMIME_crlf_copy(data, sarg.ndef_bio, flags); | |
392 | ||
393 | /* Finalize structure */ | |
394 | if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) | |
395 | rv = 0; | |
396 | ||
397 | /* Now remove any digests prepended to the BIO */ | |
398 | ||
399 | while (sarg.ndef_bio != out) { | |
400 | tmpbio = BIO_pop(sarg.ndef_bio); | |
401 | BIO_free(sarg.ndef_bio); | |
402 | sarg.ndef_bio = tmpbio; | |
403 | } | |
404 | ||
405 | return rv; | |
406 | ||
407 | } | |
408 | ||
409 | /* | |
410 | * SMIME reader: handle multipart/signed and opaque signing. in multipart | |
411 | * case the content is placed in a memory BIO pointed to by "bcont". In | |
412 | * opaque this is set to NULL | |
8931b30d DSH |
413 | */ |
414 | ||
2e86f0d8 | 415 | ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) |
8931b30d | 416 | { |
0f113f3e MC |
417 | BIO *asnin; |
418 | STACK_OF(MIME_HEADER) *headers = NULL; | |
419 | STACK_OF(BIO) *parts = NULL; | |
420 | MIME_HEADER *hdr; | |
421 | MIME_PARAM *prm; | |
422 | ASN1_VALUE *val; | |
423 | int ret; | |
424 | ||
425 | if (bcont) | |
426 | *bcont = NULL; | |
427 | ||
75ebbd9a | 428 | if ((headers = mime_parse_hdr(bio)) == NULL) { |
0f113f3e MC |
429 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR); |
430 | return NULL; | |
431 | } | |
432 | ||
75ebbd9a RS |
433 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
434 | || hdr->value == NULL) { | |
0f113f3e MC |
435 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
436 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); | |
437 | return NULL; | |
438 | } | |
439 | ||
440 | /* Handle multipart/signed */ | |
441 | ||
86885c28 | 442 | if (strcmp(hdr->value, "multipart/signed") == 0) { |
0f113f3e MC |
443 | /* Split into two parts */ |
444 | prm = mime_param_find(hdr, "boundary"); | |
445 | if (!prm || !prm->param_value) { | |
446 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
447 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); | |
448 | return NULL; | |
449 | } | |
450 | ret = multi_split(bio, prm->param_value, &parts); | |
451 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
452 | if (!ret || (sk_BIO_num(parts) != 2)) { | |
453 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); | |
454 | sk_BIO_pop_free(parts, BIO_vfree); | |
455 | return NULL; | |
456 | } | |
457 | ||
458 | /* Parse the signature piece */ | |
459 | asnin = sk_BIO_value(parts, 1); | |
460 | ||
75ebbd9a | 461 | if ((headers = mime_parse_hdr(asnin)) == NULL) { |
0f113f3e MC |
462 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR); |
463 | sk_BIO_pop_free(parts, BIO_vfree); | |
464 | return NULL; | |
465 | } | |
466 | ||
467 | /* Get content type */ | |
468 | ||
75ebbd9a RS |
469 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
470 | || hdr->value == NULL) { | |
0f113f3e MC |
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 */ | |
75ebbd9a | 486 | if ((val = b64_read_asn1(asnin, it)) == NULL) { |
0f113f3e MC |
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 | ||
75ebbd9a | 513 | if ((val = b64_read_asn1(bio, it)) == NULL) { |
0f113f3e MC |
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()); | |
90945fa3 | 533 | if (bf == NULL) |
0f113f3e MC |
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 | ||
75ebbd9a | 576 | if ((headers = mime_parse_hdr(in)) == NULL) { |
0f113f3e MC |
577 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR); |
578 | return 0; | |
579 | } | |
75ebbd9a RS |
580 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
581 | || hdr->value == NULL) { | |
0f113f3e MC |
582 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE); |
583 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
584 | return 0; | |
585 | } | |
586 | if (strcmp(hdr->value, "text/plain")) { | |
587 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE); | |
588 | ERR_add_error_data(2, "type: ", hdr->value); | |
589 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
590 | return 0; | |
591 | } | |
592 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
593 | while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) | |
594 | BIO_write(out, iobuf, len); | |
595 | if (len < 0) | |
596 | return 0; | |
597 | return 1; | |
8931b30d DSH |
598 | } |
599 | ||
0f113f3e MC |
600 | /* |
601 | * Split a multipart/XXX message body into component parts: result is | |
8931b30d DSH |
602 | * canonical parts in a STACK of bios |
603 | */ | |
604 | ||
605 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) | |
606 | { | |
0f113f3e MC |
607 | char linebuf[MAX_SMLEN]; |
608 | int len, blen; | |
609 | int eol = 0, next_eol = 0; | |
610 | BIO *bpart = NULL; | |
611 | STACK_OF(BIO) *parts; | |
612 | char state, part, first; | |
613 | ||
614 | blen = strlen(bound); | |
615 | part = 0; | |
616 | state = 0; | |
617 | first = 1; | |
618 | parts = sk_BIO_new_null(); | |
619 | *ret = parts; | |
620 | if (*ret == NULL) | |
621 | return 0; | |
622 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
623 | state = mime_bound_check(linebuf, len, bound, blen); | |
624 | if (state == 1) { | |
625 | first = 1; | |
626 | part++; | |
627 | } else if (state == 2) { | |
628 | if (!sk_BIO_push(parts, bpart)) { | |
629 | BIO_free(bpart); | |
630 | return 0; | |
631 | } | |
632 | return 1; | |
633 | } else if (part) { | |
634 | /* Strip CR+LF from linebuf */ | |
635 | next_eol = strip_eol(linebuf, &len, 0); | |
636 | if (first) { | |
637 | first = 0; | |
638 | if (bpart) | |
639 | if (!sk_BIO_push(parts, bpart)) { | |
640 | BIO_free(bpart); | |
641 | return 0; | |
642 | } | |
643 | bpart = BIO_new(BIO_s_mem()); | |
644 | if (bpart == NULL) | |
645 | return 0; | |
646 | BIO_set_mem_eof_return(bpart, 0); | |
647 | } else if (eol) | |
648 | BIO_write(bpart, "\r\n", 2); | |
649 | eol = next_eol; | |
650 | if (len) | |
651 | BIO_write(bpart, linebuf, len); | |
652 | } | |
653 | } | |
ca3a82c3 | 654 | BIO_free(bpart); |
0f113f3e | 655 | return 0; |
8931b30d DSH |
656 | } |
657 | ||
658 | /* This is the big one: parse MIME header lines up to message body */ | |
659 | ||
0f113f3e MC |
660 | #define MIME_INVALID 0 |
661 | #define MIME_START 1 | |
662 | #define MIME_TYPE 2 | |
663 | #define MIME_NAME 3 | |
664 | #define MIME_VALUE 4 | |
665 | #define MIME_QUOTE 5 | |
666 | #define MIME_COMMENT 6 | |
8931b30d DSH |
667 | |
668 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) | |
669 | { | |
0f113f3e MC |
670 | char *p, *q, c; |
671 | char *ntmp; | |
672 | char linebuf[MAX_SMLEN]; | |
673 | MIME_HEADER *mhdr = NULL; | |
674 | STACK_OF(MIME_HEADER) *headers; | |
675 | int len, state, save_state = 0; | |
676 | ||
677 | headers = sk_MIME_HEADER_new(mime_hdr_cmp); | |
90945fa3 | 678 | if (headers == NULL) |
0f113f3e MC |
679 | return NULL; |
680 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
681 | /* If whitespace at line start then continuation line */ | |
682 | if (mhdr && isspace((unsigned char)linebuf[0])) | |
683 | state = MIME_NAME; | |
684 | else | |
685 | state = MIME_START; | |
686 | ntmp = NULL; | |
687 | /* Go through all characters */ | |
688 | for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n'); | |
689 | p++) { | |
690 | ||
691 | /* | |
692 | * State machine to handle MIME headers if this looks horrible | |
693 | * that's because it *is* | |
694 | */ | |
695 | ||
696 | switch (state) { | |
697 | case MIME_START: | |
698 | if (c == ':') { | |
699 | state = MIME_TYPE; | |
700 | *p = 0; | |
701 | ntmp = strip_ends(q); | |
702 | q = p + 1; | |
703 | } | |
704 | break; | |
705 | ||
706 | case MIME_TYPE: | |
707 | if (c == ';') { | |
708 | mime_debug("Found End Value\n"); | |
709 | *p = 0; | |
710 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
711 | sk_MIME_HEADER_push(headers, mhdr); | |
712 | ntmp = NULL; | |
713 | q = p + 1; | |
714 | state = MIME_NAME; | |
715 | } else if (c == '(') { | |
716 | save_state = state; | |
717 | state = MIME_COMMENT; | |
718 | } | |
719 | break; | |
720 | ||
721 | case MIME_COMMENT: | |
722 | if (c == ')') { | |
723 | state = save_state; | |
724 | } | |
725 | break; | |
726 | ||
727 | case MIME_NAME: | |
728 | if (c == '=') { | |
729 | state = MIME_VALUE; | |
730 | *p = 0; | |
731 | ntmp = strip_ends(q); | |
732 | q = p + 1; | |
733 | } | |
734 | break; | |
735 | ||
736 | case MIME_VALUE: | |
737 | if (c == ';') { | |
738 | state = MIME_NAME; | |
739 | *p = 0; | |
740 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
741 | ntmp = NULL; | |
742 | q = p + 1; | |
743 | } else if (c == '"') { | |
744 | mime_debug("Found Quote\n"); | |
745 | state = MIME_QUOTE; | |
746 | } else if (c == '(') { | |
747 | save_state = state; | |
748 | state = MIME_COMMENT; | |
749 | } | |
750 | break; | |
751 | ||
752 | case MIME_QUOTE: | |
753 | if (c == '"') { | |
754 | mime_debug("Found Match Quote\n"); | |
755 | state = MIME_VALUE; | |
756 | } | |
757 | break; | |
758 | } | |
759 | } | |
760 | ||
761 | if (state == MIME_TYPE) { | |
762 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
763 | sk_MIME_HEADER_push(headers, mhdr); | |
764 | } else if (state == MIME_VALUE) | |
765 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
766 | if (p == linebuf) | |
767 | break; /* Blank line means end of headers */ | |
768 | } | |
769 | ||
770 | return headers; | |
8931b30d DSH |
771 | |
772 | } | |
773 | ||
774 | static char *strip_ends(char *name) | |
775 | { | |
0f113f3e | 776 | return strip_end(strip_start(name)); |
8931b30d DSH |
777 | } |
778 | ||
779 | /* Strip a parameter of whitespace from start of param */ | |
780 | static char *strip_start(char *name) | |
781 | { | |
0f113f3e MC |
782 | char *p, c; |
783 | /* Look for first non white space or quote */ | |
784 | for (p = name; (c = *p); p++) { | |
785 | if (c == '"') { | |
786 | /* Next char is start of string if non null */ | |
787 | if (p[1]) | |
788 | return p + 1; | |
789 | /* Else null string */ | |
790 | return NULL; | |
791 | } | |
792 | if (!isspace((unsigned char)c)) | |
793 | return p; | |
794 | } | |
795 | return NULL; | |
8931b30d DSH |
796 | } |
797 | ||
798 | /* As above but strip from end of string : maybe should handle brackets? */ | |
799 | static char *strip_end(char *name) | |
800 | { | |
0f113f3e MC |
801 | char *p, c; |
802 | if (!name) | |
803 | return NULL; | |
804 | /* Look for first non white space or quote */ | |
805 | for (p = name + strlen(name) - 1; p >= name; p--) { | |
806 | c = *p; | |
807 | if (c == '"') { | |
808 | if (p - 1 == name) | |
809 | return NULL; | |
810 | *p = 0; | |
811 | return name; | |
812 | } | |
813 | if (isspace((unsigned char)c)) | |
814 | *p = 0; | |
815 | else | |
816 | return name; | |
817 | } | |
818 | return NULL; | |
8931b30d DSH |
819 | } |
820 | ||
821 | static MIME_HEADER *mime_hdr_new(char *name, char *value) | |
822 | { | |
0f113f3e MC |
823 | MIME_HEADER *mhdr = NULL; |
824 | char *tmpname = NULL, *tmpval = NULL, *p; | |
825 | int c; | |
75ebbd9a | 826 | |
0f113f3e | 827 | if (name) { |
7644a9ae | 828 | if ((tmpname = OPENSSL_strdup(name)) == NULL) |
0f113f3e MC |
829 | return NULL; |
830 | for (p = tmpname; *p; p++) { | |
831 | c = (unsigned char)*p; | |
832 | if (isupper(c)) { | |
833 | c = tolower(c); | |
834 | *p = c; | |
835 | } | |
836 | } | |
837 | } | |
838 | if (value) { | |
7644a9ae | 839 | if ((tmpval = OPENSSL_strdup(value)) == NULL) |
0f113f3e MC |
840 | goto err; |
841 | for (p = tmpval; *p; p++) { | |
842 | c = (unsigned char)*p; | |
843 | if (isupper(c)) { | |
844 | c = tolower(c); | |
845 | *p = c; | |
846 | } | |
847 | } | |
848 | } | |
b4faea50 | 849 | mhdr = OPENSSL_malloc(sizeof(*mhdr)); |
90945fa3 | 850 | if (mhdr == NULL) |
0f113f3e MC |
851 | goto err; |
852 | mhdr->name = tmpname; | |
853 | mhdr->value = tmpval; | |
75ebbd9a | 854 | if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL) |
0f113f3e MC |
855 | goto err; |
856 | return mhdr; | |
857 | ||
858 | err: | |
b548a1f1 RS |
859 | OPENSSL_free(tmpname); |
860 | OPENSSL_free(tmpval); | |
861 | OPENSSL_free(mhdr); | |
0f113f3e | 862 | return NULL; |
8931b30d | 863 | } |
0f113f3e | 864 | |
8931b30d DSH |
865 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) |
866 | { | |
0f113f3e MC |
867 | char *tmpname = NULL, *tmpval = NULL, *p; |
868 | int c; | |
869 | MIME_PARAM *mparam = NULL; | |
870 | if (name) { | |
7644a9ae | 871 | tmpname = OPENSSL_strdup(name); |
0f113f3e MC |
872 | if (!tmpname) |
873 | goto err; | |
874 | for (p = tmpname; *p; p++) { | |
875 | c = (unsigned char)*p; | |
876 | if (isupper(c)) { | |
877 | c = tolower(c); | |
878 | *p = c; | |
879 | } | |
880 | } | |
881 | } | |
882 | if (value) { | |
7644a9ae | 883 | tmpval = OPENSSL_strdup(value); |
0f113f3e MC |
884 | if (!tmpval) |
885 | goto err; | |
886 | } | |
887 | /* Parameter values are case sensitive so leave as is */ | |
b4faea50 | 888 | mparam = OPENSSL_malloc(sizeof(*mparam)); |
90945fa3 | 889 | if (mparam == NULL) |
0f113f3e MC |
890 | goto err; |
891 | mparam->param_name = tmpname; | |
892 | mparam->param_value = tmpval; | |
893 | if (!sk_MIME_PARAM_push(mhdr->params, mparam)) | |
894 | goto err; | |
895 | return 1; | |
896 | err: | |
b548a1f1 RS |
897 | OPENSSL_free(tmpname); |
898 | OPENSSL_free(tmpval); | |
899 | OPENSSL_free(mparam); | |
0f113f3e | 900 | return 0; |
8931b30d DSH |
901 | } |
902 | ||
0f113f3e MC |
903 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
904 | const MIME_HEADER *const *b) | |
8931b30d | 905 | { |
0f113f3e MC |
906 | if (!(*a)->name || !(*b)->name) |
907 | return ! !(*a)->name - ! !(*b)->name; | |
6941b7b9 | 908 | |
0f113f3e | 909 | return (strcmp((*a)->name, (*b)->name)); |
8931b30d DSH |
910 | } |
911 | ||
0f113f3e MC |
912 | static int mime_param_cmp(const MIME_PARAM *const *a, |
913 | const MIME_PARAM *const *b) | |
8931b30d | 914 | { |
0f113f3e MC |
915 | if (!(*a)->param_name || !(*b)->param_name) |
916 | return ! !(*a)->param_name - ! !(*b)->param_name; | |
917 | return (strcmp((*a)->param_name, (*b)->param_name)); | |
8931b30d DSH |
918 | } |
919 | ||
920 | /* Find a header with a given name (if possible) */ | |
921 | ||
922 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) | |
923 | { | |
0f113f3e MC |
924 | MIME_HEADER htmp; |
925 | int idx; | |
926 | htmp.name = name; | |
927 | idx = sk_MIME_HEADER_find(hdrs, &htmp); | |
928 | if (idx < 0) | |
929 | return NULL; | |
930 | return sk_MIME_HEADER_value(hdrs, idx); | |
8931b30d DSH |
931 | } |
932 | ||
933 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
934 | { | |
0f113f3e MC |
935 | MIME_PARAM param; |
936 | int idx; | |
937 | param.param_name = name; | |
938 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); | |
939 | if (idx < 0) | |
940 | return NULL; | |
941 | return sk_MIME_PARAM_value(hdr->params, idx); | |
8931b30d DSH |
942 | } |
943 | ||
944 | static void mime_hdr_free(MIME_HEADER *hdr) | |
945 | { | |
b548a1f1 RS |
946 | OPENSSL_free(hdr->name); |
947 | OPENSSL_free(hdr->value); | |
0f113f3e MC |
948 | if (hdr->params) |
949 | sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
950 | OPENSSL_free(hdr); | |
8931b30d DSH |
951 | } |
952 | ||
953 | static void mime_param_free(MIME_PARAM *param) | |
954 | { | |
b548a1f1 RS |
955 | OPENSSL_free(param->param_name); |
956 | OPENSSL_free(param->param_value); | |
0f113f3e | 957 | OPENSSL_free(param); |
8931b30d DSH |
958 | } |
959 | ||
c80fd6b2 MC |
960 | /*- |
961 | * Check for a multipart boundary. Returns: | |
8931b30d DSH |
962 | * 0 : no boundary |
963 | * 1 : part boundary | |
964 | * 2 : final boundary | |
965 | */ | |
966 | static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
967 | { | |
0f113f3e MC |
968 | if (linelen == -1) |
969 | linelen = strlen(line); | |
970 | if (blen == -1) | |
971 | blen = strlen(bound); | |
972 | /* Quickly eliminate if line length too short */ | |
973 | if (blen + 2 > linelen) | |
974 | return 0; | |
975 | /* Check for part boundary */ | |
86885c28 RS |
976 | if ((strncmp(line, "--", 2) == 0) |
977 | && strncmp(line + 2, bound, blen) == 0) { | |
978 | if (strncmp(line + blen + 2, "--", 2) == 0) | |
0f113f3e MC |
979 | return 2; |
980 | else | |
981 | return 1; | |
982 | } | |
983 | return 0; | |
8931b30d DSH |
984 | } |
985 | ||
847865d0 | 986 | static int strip_eol(char *linebuf, int *plen, int flags) |
0f113f3e MC |
987 | { |
988 | int len = *plen; | |
989 | char *p, c; | |
990 | int is_eol = 0; | |
991 | p = linebuf + len - 1; | |
992 | for (p = linebuf + len - 1; len > 0; len--, p--) { | |
993 | c = *p; | |
994 | if (c == '\n') | |
995 | is_eol = 1; | |
996 | else if (is_eol && flags & SMIME_ASCIICRLF && c < 33) | |
997 | continue; | |
998 | else if (c != '\r') | |
999 | break; | |
1000 | } | |
1001 | *plen = len; | |
1002 | return is_eol; | |
1003 | } |