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1 /* asn_mime.c */ | |
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
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 | |
13 * notice, this list of conditions and the following disclaimer. | |
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> | |
57 #include "cryptlib.h" | |
58 #include <openssl/rand.h> | |
59 #include <openssl/x509.h> | |
60 #include <openssl/asn1.h> | |
61 #include <openssl/asn1t.h> | |
62 #include "asn1_locl.h" | |
63 | |
64 /* Generalised MIME like utilities for streaming ASN1. Although many | |
65 * have a PKCS7/CMS like flavour others are more general purpose. | |
66 */ | |
67 | |
68 /* MIME format structures | |
69 * Note that all are translated to lower case apart from | |
70 * parameter values. Quotes are stripped off | |
71 */ | |
72 | |
73 typedef struct { | |
74 char *param_name; /* Param name e.g. "micalg" */ | |
75 char *param_value; /* Param value e.g. "sha1" */ | |
76 } MIME_PARAM; | |
77 | |
78 DECLARE_STACK_OF(MIME_PARAM) | |
79 IMPLEMENT_STACK_OF(MIME_PARAM) | |
80 | |
81 typedef struct { | |
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 */ | |
85 } MIME_HEADER; | |
86 | |
87 DECLARE_STACK_OF(MIME_HEADER) | |
88 IMPLEMENT_STACK_OF(MIME_HEADER) | |
89 | |
90 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
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); | |
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); | |
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); | |
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); | |
105 static int strip_eol(char *linebuf, int *plen); | |
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 | |
111 #define mime_debug(x) /* x */ | |
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, | |
116 const ASN1_ITEM *it) | |
117 { | |
118 /* If streaming create stream BIO and copy all content through it */ | |
119 if (flags & SMIME_STREAM) | |
120 { | |
121 BIO *bio, *tbio; | |
122 bio = BIO_new_NDEF(out, val, it); | |
123 if (!bio) | |
124 { | |
125 ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM,ERR_R_MALLOC_FAILURE)
; | |
126 return 0; | |
127 } | |
128 SMIME_crlf_copy(in, bio, flags); | |
129 (void)BIO_flush(bio); | |
130 /* Free up successive BIOs until we hit the old output BIO */ | |
131 do | |
132 { | |
133 tbio = BIO_pop(bio); | |
134 BIO_free(bio); | |
135 bio = tbio; | |
136 } while (bio != out); | |
137 } | |
138 /* else just write out ASN1 structure which will have all content | |
139 * stored internally | |
140 */ | |
141 else | |
142 ASN1_item_i2d_bio(it, out, val); | |
143 return 1; | |
144 } | |
145 | |
146 /* Base 64 read and write of ASN1 structure */ | |
147 | |
148 static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
149 const ASN1_ITEM *it) | |
150 { | |
151 BIO *b64; | |
152 int r; | |
153 b64 = BIO_new(BIO_f_base64()); | |
154 if(!b64) | |
155 { | |
156 ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE); | |
157 return 0; | |
158 } | |
159 /* prepend the b64 BIO so all data is base64 encoded. | |
160 */ | |
161 out = BIO_push(b64, out); | |
162 r = i2d_ASN1_bio_stream(out, val, in, flags, it); | |
163 (void)BIO_flush(out); | |
164 BIO_pop(out); | |
165 BIO_free(b64); | |
166 return r; | |
167 } | |
168 | |
169 /* Streaming ASN1 PEM write */ | |
170 | |
171 int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
172 const char *hdr, | |
173 const ASN1_ITEM *it) | |
174 { | |
175 int r; | |
176 BIO_printf(out, "-----BEGIN %s-----\n", hdr); | |
177 r = B64_write_ASN1(out, val, in, flags, it); | |
178 BIO_printf(out, "-----END %s-----\n", hdr); | |
179 return r; | |
180 } | |
181 | |
182 static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) | |
183 { | |
184 BIO *b64; | |
185 ASN1_VALUE *val; | |
186 if(!(b64 = BIO_new(BIO_f_base64()))) { | |
187 ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE); | |
188 return 0; | |
189 } | |
190 bio = BIO_push(b64, bio); | |
191 val = ASN1_item_d2i_bio(it, bio, NULL); | |
192 if(!val) | |
193 ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR); | |
194 (void)BIO_flush(bio); | |
195 bio = BIO_pop(bio); | |
196 BIO_free(b64); | |
197 return val; | |
198 } | |
199 | |
200 /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ | |
201 | |
202 static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) | |
203 { | |
204 const EVP_MD *md; | |
205 int i, have_unknown = 0, write_comma, ret = 0, md_nid; | |
206 have_unknown = 0; | |
207 write_comma = 0; | |
208 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) | |
209 { | |
210 if (write_comma) | |
211 BIO_write(out, ",", 1); | |
212 write_comma = 1; | |
213 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); | |
214 md = EVP_get_digestbynid(md_nid); | |
215 if (md && md->md_ctrl) | |
216 { | |
217 int rv; | |
218 char *micstr; | |
219 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); | |
220 if (rv > 0) | |
221 { | |
222 BIO_puts(out, micstr); | |
223 OPENSSL_free(micstr); | |
224 continue; | |
225 } | |
226 if (rv != -2) | |
227 goto err; | |
228 } | |
229 switch(md_nid) | |
230 { | |
231 case NID_sha1: | |
232 BIO_puts(out, "sha1"); | |
233 break; | |
234 | |
235 case NID_md5: | |
236 BIO_puts(out, "md5"); | |
237 break; | |
238 | |
239 case NID_sha256: | |
240 BIO_puts(out, "sha-256"); | |
241 break; | |
242 | |
243 case NID_sha384: | |
244 BIO_puts(out, "sha-384"); | |
245 break; | |
246 | |
247 case NID_sha512: | |
248 BIO_puts(out, "sha-512"); | |
249 break; | |
250 | |
251 case NID_id_GostR3411_94: | |
252 BIO_puts(out, "gostr3411-94"); | |
253 goto err; | |
254 break; | |
255 | |
256 default: | |
257 if (have_unknown) | |
258 write_comma = 0; | |
259 else | |
260 { | |
261 BIO_puts(out, "unknown"); | |
262 have_unknown = 1; | |
263 } | |
264 break; | |
265 | |
266 } | |
267 } | |
268 | |
269 ret = 1; | |
270 err: | |
271 | |
272 return ret; | |
273 | |
274 } | |
275 | |
276 /* SMIME sender */ | |
277 | |
278 int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, | |
279 int ctype_nid, int econt_nid, | |
280 STACK_OF(X509_ALGOR) *mdalgs, | |
281 const ASN1_ITEM *it) | |
282 { | |
283 char bound[33], c; | |
284 int i; | |
285 const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; | |
286 const char *msg_type=NULL; | |
287 if (flags & SMIME_OLDMIME) | |
288 mime_prefix = "application/x-pkcs7-"; | |
289 else | |
290 mime_prefix = "application/pkcs7-"; | |
291 | |
292 if (flags & SMIME_CRLFEOL) | |
293 mime_eol = "\r\n"; | |
294 else | |
295 mime_eol = "\n"; | |
296 if((flags & SMIME_DETACHED) && data) { | |
297 /* We want multipart/signed */ | |
298 /* Generate a random boundary */ | |
299 RAND_pseudo_bytes((unsigned char *)bound, 32); | |
300 for(i = 0; i < 32; i++) { | |
301 c = bound[i] & 0xf; | |
302 if(c < 10) c += '0'; | |
303 else c += 'A' - 10; | |
304 bound[i] = c; | |
305 } | |
306 bound[32] = 0; | |
307 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
308 BIO_printf(bio, "Content-Type: multipart/signed;"); | |
309 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); | |
310 BIO_puts(bio, " micalg=\""); | |
311 asn1_write_micalg(bio, mdalgs); | |
312 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", | |
313 bound, mime_eol, mime_eol); | |
314 BIO_printf(bio, "This is an S/MIME signed message%s%s", | |
315 mime_eol, mime_eol); | |
316 /* Now write out the first part */ | |
317 BIO_printf(bio, "------%s%s", bound, mime_eol); | |
318 if (!asn1_output_data(bio, data, val, flags, it)) | |
319 return 0; | |
320 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); | |
321 | |
322 /* Headers for signature */ | |
323 | |
324 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); | |
325 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); | |
326 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", | |
327 mime_eol); | |
328 BIO_printf(bio, "Content-Disposition: attachment;"); | |
329 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", | |
330 mime_eol, mime_eol); | |
331 B64_write_ASN1(bio, val, NULL, 0, it); | |
332 BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound, | |
333 mime_eol, mime_eol); | |
334 return 1; | |
335 } | |
336 | |
337 /* Determine smime-type header */ | |
338 | |
339 if (ctype_nid == NID_pkcs7_enveloped) | |
340 msg_type = "enveloped-data"; | |
341 else if (ctype_nid == NID_pkcs7_signed) | |
342 { | |
343 if (econt_nid == NID_id_smime_ct_receipt) | |
344 msg_type = "signed-receipt"; | |
345 else if (sk_X509_ALGOR_num(mdalgs) >= 0) | |
346 msg_type = "signed-data"; | |
347 else | |
348 msg_type = "certs-only"; | |
349 } | |
350 else if (ctype_nid == NID_id_smime_ct_compressedData) | |
351 { | |
352 msg_type = "compressed-data"; | |
353 cname = "smime.p7z"; | |
354 } | |
355 /* MIME headers */ | |
356 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
357 BIO_printf(bio, "Content-Disposition: attachment;"); | |
358 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); | |
359 BIO_printf(bio, "Content-Type: %smime;", mime_prefix); | |
360 if (msg_type) | |
361 BIO_printf(bio, " smime-type=%s;", msg_type); | |
362 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); | |
363 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", | |
364 mime_eol, mime_eol); | |
365 if (!B64_write_ASN1(bio, val, data, flags, it)) | |
366 return 0; | |
367 BIO_printf(bio, "%s", mime_eol); | |
368 return 1; | |
369 } | |
370 | |
371 /* Handle output of ASN1 data */ | |
372 | |
373 | |
374 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
375 const ASN1_ITEM *it) | |
376 { | |
377 BIO *tmpbio; | |
378 const ASN1_AUX *aux = it->funcs; | |
379 ASN1_STREAM_ARG sarg; | |
380 int rv = 1; | |
381 | |
382 /* If data is not deteched or resigning then the output BIO is | |
383 * already set up to finalise when it is written through. | |
384 */ | |
385 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) | |
386 { | |
387 SMIME_crlf_copy(data, out, flags); | |
388 return 1; | |
389 } | |
390 | |
391 if (!aux || !aux->asn1_cb) | |
392 { | |
393 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, | |
394 ASN1_R_STREAMING_NOT_SUPPORTED); | |
395 return 0; | |
396 } | |
397 | |
398 sarg.out = out; | |
399 sarg.ndef_bio = NULL; | |
400 sarg.boundary = NULL; | |
401 | |
402 /* Let ASN1 code prepend any needed BIOs */ | |
403 | |
404 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) | |
405 return 0; | |
406 | |
407 /* Copy data across, passing through filter BIOs for processing */ | |
408 SMIME_crlf_copy(data, sarg.ndef_bio, flags); | |
409 | |
410 /* Finalize structure */ | |
411 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) | |
412 rv = 0; | |
413 | |
414 /* Now remove any digests prepended to the BIO */ | |
415 | |
416 while (sarg.ndef_bio != out) | |
417 { | |
418 tmpbio = BIO_pop(sarg.ndef_bio); | |
419 BIO_free(sarg.ndef_bio); | |
420 sarg.ndef_bio = tmpbio; | |
421 } | |
422 | |
423 return rv; | |
424 | |
425 } | |
426 | |
427 /* SMIME reader: handle multipart/signed and opaque signing. | |
428 * in multipart case the content is placed in a memory BIO | |
429 * pointed to by "bcont". In opaque this is set to NULL | |
430 */ | |
431 | |
432 ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) | |
433 { | |
434 BIO *asnin; | |
435 STACK_OF(MIME_HEADER) *headers = NULL; | |
436 STACK_OF(BIO) *parts = NULL; | |
437 MIME_HEADER *hdr; | |
438 MIME_PARAM *prm; | |
439 ASN1_VALUE *val; | |
440 int ret; | |
441 | |
442 if(bcont) *bcont = NULL; | |
443 | |
444 if (!(headers = mime_parse_hdr(bio))) { | |
445 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR); | |
446 return NULL; | |
447 } | |
448 | |
449 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
450 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
451 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); | |
452 return NULL; | |
453 } | |
454 | |
455 /* Handle multipart/signed */ | |
456 | |
457 if(!strcmp(hdr->value, "multipart/signed")) { | |
458 /* Split into two parts */ | |
459 prm = mime_param_find(hdr, "boundary"); | |
460 if(!prm || !prm->param_value) { | |
461 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
462 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUN
DARY); | |
463 return NULL; | |
464 } | |
465 ret = multi_split(bio, prm->param_value, &parts); | |
466 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
467 if(!ret || (sk_BIO_num(parts) != 2) ) { | |
468 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY
_FAILURE); | |
469 sk_BIO_pop_free(parts, BIO_vfree); | |
470 return NULL; | |
471 } | |
472 | |
473 /* Parse the signature piece */ | |
474 asnin = sk_BIO_value(parts, 1); | |
475 | |
476 if (!(headers = mime_parse_hdr(asnin))) { | |
477 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERR
OR); | |
478 sk_BIO_pop_free(parts, BIO_vfree); | |
479 return NULL; | |
480 } | |
481 | |
482 /* Get content type */ | |
483 | |
484 if(!(hdr = mime_hdr_find(headers, "content-type")) || | |
485 !hdr->value) { | |
486 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
487 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TY
PE); | |
488 return NULL; | |
489 } | |
490 | |
491 if(strcmp(hdr->value, "application/x-pkcs7-signature") && | |
492 strcmp(hdr->value, "application/pkcs7-signature")) { | |
493 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_T
YPE); | |
494 ERR_add_error_data(2, "type: ", hdr->value); | |
495 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
496 sk_BIO_pop_free(parts, BIO_vfree); | |
497 return NULL; | |
498 } | |
499 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
500 /* Read in ASN1 */ | |
501 if(!(val = b64_read_asn1(asnin, it))) { | |
502 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERR
OR); | |
503 sk_BIO_pop_free(parts, BIO_vfree); | |
504 return NULL; | |
505 } | |
506 | |
507 if(bcont) { | |
508 *bcont = sk_BIO_value(parts, 0); | |
509 BIO_free(asnin); | |
510 sk_BIO_free(parts); | |
511 } else sk_BIO_pop_free(parts, BIO_vfree); | |
512 return val; | |
513 } | |
514 | |
515 /* OK, if not multipart/signed try opaque signature */ | |
516 | |
517 if (strcmp (hdr->value, "application/x-pkcs7-mime") && | |
518 strcmp (hdr->value, "application/pkcs7-mime")) { | |
519 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE); | |
520 ERR_add_error_data(2, "type: ", hdr->value); | |
521 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
522 return NULL; | |
523 } | |
524 | |
525 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
526 | |
527 if(!(val = b64_read_asn1(bio, it))) { | |
528 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); | |
529 return NULL; | |
530 } | |
531 return val; | |
532 | |
533 } | |
534 | |
535 /* Copy text from one BIO to another making the output CRLF at EOL */ | |
536 int SMIME_crlf_copy(BIO *in, BIO *out, int flags) | |
537 { | |
538 BIO *bf; | |
539 char eol; | |
540 int len; | |
541 char linebuf[MAX_SMLEN]; | |
542 /* Buffer output so we don't write one line at a time. This is | |
543 * useful when streaming as we don't end up with one OCTET STRING | |
544 * per line. | |
545 */ | |
546 bf = BIO_new(BIO_f_buffer()); | |
547 if (!bf) | |
548 return 0; | |
549 out = BIO_push(bf, out); | |
550 if(flags & SMIME_BINARY) | |
551 { | |
552 while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) | |
553 BIO_write(out, linebuf, len); | |
554 } | |
555 else | |
556 { | |
557 if(flags & SMIME_TEXT) | |
558 BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); | |
559 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) | |
560 { | |
561 eol = strip_eol(linebuf, &len); | |
562 if (len) | |
563 BIO_write(out, linebuf, len); | |
564 if(eol) BIO_write(out, "\r\n", 2); | |
565 } | |
566 } | |
567 (void)BIO_flush(out); | |
568 BIO_pop(out); | |
569 BIO_free(bf); | |
570 return 1; | |
571 } | |
572 | |
573 /* Strip off headers if they are text/plain */ | |
574 int SMIME_text(BIO *in, BIO *out) | |
575 { | |
576 char iobuf[4096]; | |
577 int len; | |
578 STACK_OF(MIME_HEADER) *headers; | |
579 MIME_HEADER *hdr; | |
580 | |
581 if (!(headers = mime_parse_hdr(in))) { | |
582 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR); | |
583 return 0; | |
584 } | |
585 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
586 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE); | |
587 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
588 return 0; | |
589 } | |
590 if (strcmp (hdr->value, "text/plain")) { | |
591 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE); | |
592 ERR_add_error_data(2, "type: ", hdr->value); | |
593 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
594 return 0; | |
595 } | |
596 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
597 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) | |
598 BIO_write(out, iobuf, len); | |
599 if (len < 0) | |
600 return 0; | |
601 return 1; | |
602 } | |
603 | |
604 /* Split a multipart/XXX message body into component parts: result is | |
605 * canonical parts in a STACK of bios | |
606 */ | |
607 | |
608 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) | |
609 { | |
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 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
624 state = mime_bound_check(linebuf, len, bound, blen); | |
625 if(state == 1) { | |
626 first = 1; | |
627 part++; | |
628 } else if(state == 2) { | |
629 sk_BIO_push(parts, bpart); | |
630 return 1; | |
631 } else if(part) { | |
632 /* Strip CR+LF from linebuf */ | |
633 next_eol = strip_eol(linebuf, &len); | |
634 if(first) { | |
635 first = 0; | |
636 if(bpart) sk_BIO_push(parts, bpart); | |
637 bpart = BIO_new(BIO_s_mem()); | |
638 BIO_set_mem_eof_return(bpart, 0); | |
639 } else if (eol) | |
640 BIO_write(bpart, "\r\n", 2); | |
641 eol = next_eol; | |
642 if (len) | |
643 BIO_write(bpart, linebuf, len); | |
644 } | |
645 } | |
646 return 0; | |
647 } | |
648 | |
649 /* This is the big one: parse MIME header lines up to message body */ | |
650 | |
651 #define MIME_INVALID 0 | |
652 #define MIME_START 1 | |
653 #define MIME_TYPE 2 | |
654 #define MIME_NAME 3 | |
655 #define MIME_VALUE 4 | |
656 #define MIME_QUOTE 5 | |
657 #define MIME_COMMENT 6 | |
658 | |
659 | |
660 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) | |
661 { | |
662 char *p, *q, c; | |
663 char *ntmp; | |
664 char linebuf[MAX_SMLEN]; | |
665 MIME_HEADER *mhdr = NULL; | |
666 STACK_OF(MIME_HEADER) *headers; | |
667 int len, state, save_state = 0; | |
668 | |
669 headers = sk_MIME_HEADER_new(mime_hdr_cmp); | |
670 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
671 /* If whitespace at line start then continuation line */ | |
672 if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; | |
673 else state = MIME_START; | |
674 ntmp = NULL; | |
675 /* Go through all characters */ | |
676 for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { | |
677 | |
678 /* State machine to handle MIME headers | |
679 * if this looks horrible that's because it *is* | |
680 */ | |
681 | |
682 switch(state) { | |
683 case MIME_START: | |
684 if(c == ':') { | |
685 state = MIME_TYPE; | |
686 *p = 0; | |
687 ntmp = strip_ends(q); | |
688 q = p + 1; | |
689 } | |
690 break; | |
691 | |
692 case MIME_TYPE: | |
693 if(c == ';') { | |
694 mime_debug("Found End Value\n"); | |
695 *p = 0; | |
696 mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
697 sk_MIME_HEADER_push(headers, mhdr); | |
698 ntmp = NULL; | |
699 q = p + 1; | |
700 state = MIME_NAME; | |
701 } else if(c == '(') { | |
702 save_state = state; | |
703 state = MIME_COMMENT; | |
704 } | |
705 break; | |
706 | |
707 case MIME_COMMENT: | |
708 if(c == ')') { | |
709 state = save_state; | |
710 } | |
711 break; | |
712 | |
713 case MIME_NAME: | |
714 if(c == '=') { | |
715 state = MIME_VALUE; | |
716 *p = 0; | |
717 ntmp = strip_ends(q); | |
718 q = p + 1; | |
719 } | |
720 break ; | |
721 | |
722 case MIME_VALUE: | |
723 if(c == ';') { | |
724 state = MIME_NAME; | |
725 *p = 0; | |
726 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
727 ntmp = NULL; | |
728 q = p + 1; | |
729 } else if (c == '"') { | |
730 mime_debug("Found Quote\n"); | |
731 state = MIME_QUOTE; | |
732 } else if(c == '(') { | |
733 save_state = state; | |
734 state = MIME_COMMENT; | |
735 } | |
736 break; | |
737 | |
738 case MIME_QUOTE: | |
739 if(c == '"') { | |
740 mime_debug("Found Match Quote\n"); | |
741 state = MIME_VALUE; | |
742 } | |
743 break; | |
744 } | |
745 } | |
746 | |
747 if(state == MIME_TYPE) { | |
748 mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
749 sk_MIME_HEADER_push(headers, mhdr); | |
750 } else if(state == MIME_VALUE) | |
751 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
752 if(p == linebuf) break; /* Blank line means end of headers */ | |
753 } | |
754 | |
755 return headers; | |
756 | |
757 } | |
758 | |
759 static char *strip_ends(char *name) | |
760 { | |
761 return strip_end(strip_start(name)); | |
762 } | |
763 | |
764 /* Strip a parameter of whitespace from start of param */ | |
765 static char *strip_start(char *name) | |
766 { | |
767 char *p, c; | |
768 /* Look for first non white space or quote */ | |
769 for(p = name; (c = *p) ;p++) { | |
770 if(c == '"') { | |
771 /* Next char is start of string if non null */ | |
772 if(p[1]) return p + 1; | |
773 /* Else null string */ | |
774 return NULL; | |
775 } | |
776 if(!isspace((unsigned char)c)) return p; | |
777 } | |
778 return NULL; | |
779 } | |
780 | |
781 /* As above but strip from end of string : maybe should handle brackets? */ | |
782 static char *strip_end(char *name) | |
783 { | |
784 char *p, c; | |
785 if(!name) return NULL; | |
786 /* Look for first non white space or quote */ | |
787 for(p = name + strlen(name) - 1; p >= name ;p--) { | |
788 c = *p; | |
789 if(c == '"') { | |
790 if(p - 1 == name) return NULL; | |
791 *p = 0; | |
792 return name; | |
793 } | |
794 if(isspace((unsigned char)c)) *p = 0; | |
795 else return name; | |
796 } | |
797 return NULL; | |
798 } | |
799 | |
800 static MIME_HEADER *mime_hdr_new(char *name, char *value) | |
801 { | |
802 MIME_HEADER *mhdr; | |
803 char *tmpname, *tmpval, *p; | |
804 int c; | |
805 if(name) { | |
806 if(!(tmpname = BUF_strdup(name))) return NULL; | |
807 for(p = tmpname ; *p; p++) { | |
808 c = (unsigned char)*p; | |
809 if(isupper(c)) { | |
810 c = tolower(c); | |
811 *p = c; | |
812 } | |
813 } | |
814 } else tmpname = NULL; | |
815 if(value) { | |
816 if(!(tmpval = BUF_strdup(value))) return NULL; | |
817 for(p = tmpval ; *p; p++) { | |
818 c = (unsigned char)*p; | |
819 if(isupper(c)) { | |
820 c = tolower(c); | |
821 *p = c; | |
822 } | |
823 } | |
824 } else tmpval = NULL; | |
825 mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); | |
826 if(!mhdr) return NULL; | |
827 mhdr->name = tmpname; | |
828 mhdr->value = tmpval; | |
829 if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; | |
830 return mhdr; | |
831 } | |
832 | |
833 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) | |
834 { | |
835 char *tmpname, *tmpval, *p; | |
836 int c; | |
837 MIME_PARAM *mparam; | |
838 if(name) { | |
839 tmpname = BUF_strdup(name); | |
840 if(!tmpname) return 0; | |
841 for(p = tmpname ; *p; p++) { | |
842 c = (unsigned char)*p; | |
843 if(isupper(c)) { | |
844 c = tolower(c); | |
845 *p = c; | |
846 } | |
847 } | |
848 } else tmpname = NULL; | |
849 if(value) { | |
850 tmpval = BUF_strdup(value); | |
851 if(!tmpval) return 0; | |
852 } else tmpval = NULL; | |
853 /* Parameter values are case sensitive so leave as is */ | |
854 mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); | |
855 if(!mparam) return 0; | |
856 mparam->param_name = tmpname; | |
857 mparam->param_value = tmpval; | |
858 sk_MIME_PARAM_push(mhdr->params, mparam); | |
859 return 1; | |
860 } | |
861 | |
862 static int mime_hdr_cmp(const MIME_HEADER * const *a, | |
863 const MIME_HEADER * const *b) | |
864 { | |
865 if (!(*a)->name || !(*b)->name) | |
866 return !!(*a)->name - !!(*b)->name; | |
867 | |
868 return(strcmp((*a)->name, (*b)->name)); | |
869 } | |
870 | |
871 static int mime_param_cmp(const MIME_PARAM * const *a, | |
872 const MIME_PARAM * const *b) | |
873 { | |
874 if (!(*a)->param_name || !(*b)->param_name) | |
875 return !!(*a)->param_name - !!(*b)->param_name; | |
876 return(strcmp((*a)->param_name, (*b)->param_name)); | |
877 } | |
878 | |
879 /* Find a header with a given name (if possible) */ | |
880 | |
881 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) | |
882 { | |
883 MIME_HEADER htmp; | |
884 int idx; | |
885 htmp.name = name; | |
886 idx = sk_MIME_HEADER_find(hdrs, &htmp); | |
887 if(idx < 0) return NULL; | |
888 return sk_MIME_HEADER_value(hdrs, idx); | |
889 } | |
890 | |
891 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
892 { | |
893 MIME_PARAM param; | |
894 int idx; | |
895 param.param_name = name; | |
896 idx = sk_MIME_PARAM_find(hdr->params, ¶m); | |
897 if(idx < 0) return NULL; | |
898 return sk_MIME_PARAM_value(hdr->params, idx); | |
899 } | |
900 | |
901 static void mime_hdr_free(MIME_HEADER *hdr) | |
902 { | |
903 if(hdr->name) OPENSSL_free(hdr->name); | |
904 if(hdr->value) OPENSSL_free(hdr->value); | |
905 if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
906 OPENSSL_free(hdr); | |
907 } | |
908 | |
909 static void mime_param_free(MIME_PARAM *param) | |
910 { | |
911 if(param->param_name) OPENSSL_free(param->param_name); | |
912 if(param->param_value) OPENSSL_free(param->param_value); | |
913 OPENSSL_free(param); | |
914 } | |
915 | |
916 /* Check for a multipart boundary. Returns: | |
917 * 0 : no boundary | |
918 * 1 : part boundary | |
919 * 2 : final boundary | |
920 */ | |
921 static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
922 { | |
923 if(linelen == -1) linelen = strlen(line); | |
924 if(blen == -1) blen = strlen(bound); | |
925 /* Quickly eliminate if line length too short */ | |
926 if(blen + 2 > linelen) return 0; | |
927 /* Check for part boundary */ | |
928 if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { | |
929 if(!strncmp(line + blen + 2, "--", 2)) return 2; | |
930 else return 1; | |
931 } | |
932 return 0; | |
933 } | |
934 | |
935 static int strip_eol(char *linebuf, int *plen) | |
936 { | |
937 int len = *plen; | |
938 char *p, c; | |
939 int is_eol = 0; | |
940 p = linebuf + len - 1; | |
941 for (p = linebuf + len - 1; len > 0; len--, p--) | |
942 { | |
943 c = *p; | |
944 if (c == '\n') | |
945 is_eol = 1; | |
946 else if (c != '\r') | |
947 break; | |
948 } | |
949 *plen = len; | |
950 return is_eol; | |
951 } | |
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