VirtualBox

source: vbox/trunk/src/libs/openssl-3.0.3/crypto/asn1/asn_mime.c@ 96388

最後變更 在這個檔案從96388是 94082,由 vboxsync 提交於 3 年 前

libs/openssl-3.0.1: started applying and adjusting our OpenSSL changes to 3.0.1. bugref:10128
檔案大小: 29.6 KB
行 
1/*
2 * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "crypto/ctype.h"
12#include "internal/cryptlib.h"
13#include <openssl/rand.h>
14#include <openssl/x509.h>
15#include <openssl/asn1.h>
16#include <openssl/asn1t.h>
17#include <openssl/cms.h>
18#include "crypto/evp.h"
19#include "internal/bio.h"
20#include "asn1_local.h"
21
22/*
23 * Generalised MIME like utilities for streaming ASN1. Although many have a
24 * PKCS7/CMS like flavour others are more general purpose.
25 */
26
27/*
28 * MIME format structures Note that all are translated to lower case apart
29 * from parameter values. Quotes are stripped off
30 */
31
32struct mime_param_st {
33 char *param_name; /* Param name e.g. "micalg" */
34 char *param_value; /* Param value e.g. "sha1" */
35};
36
37struct mime_header_st {
38 char *name; /* Name of line e.g. "content-type" */
39 char *value; /* Value of line e.g. "text/plain" */
40 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
41};
42
43static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
44 const ASN1_ITEM *it);
45static char *strip_ends(char *name);
46static char *strip_start(char *name);
47static char *strip_end(char *name);
48static MIME_HEADER *mime_hdr_new(const char *name, const char *value);
49static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value);
50static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
51static int mime_hdr_cmp(const MIME_HEADER *const *a,
52 const MIME_HEADER *const *b);
53static int mime_param_cmp(const MIME_PARAM *const *a,
54 const MIME_PARAM *const *b);
55static void mime_param_free(MIME_PARAM *param);
56static int mime_bound_check(char *line, int linelen, const char *bound, int blen);
57static int multi_split(BIO *bio, int flags, const char *bound, STACK_OF(BIO) **ret);
58static int strip_eol(char *linebuf, int *plen, int flags);
59static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
60static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name);
61static void mime_hdr_free(MIME_HEADER *hdr);
62
63#define MAX_SMLEN 1024
64#define mime_debug(x) /* x */
65
66/* Output an ASN1 structure in BER format streaming if necessary */
67
68/* unfortunately cannot constify this due to CMS_stream() and PKCS7_stream() */
69int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
70 const ASN1_ITEM *it)
71{
72 /* If streaming create stream BIO and copy all content through it */
73 if (flags & SMIME_STREAM) {
74 BIO *bio, *tbio;
75 bio = BIO_new_NDEF(out, val, it);
76 if (!bio) {
77 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
78 return 0;
79 }
80 SMIME_crlf_copy(in, bio, flags);
81 (void)BIO_flush(bio);
82 /* Free up successive BIOs until we hit the old output BIO */
83 do {
84 tbio = BIO_pop(bio);
85 BIO_free(bio);
86 bio = tbio;
87 } while (bio != out);
88 }
89 /*
90 * else just write out ASN1 structure which will have all content stored
91 * internally
92 */
93 else
94 ASN1_item_i2d_bio(it, out, val);
95 return 1;
96}
97
98/* Base 64 read and write of ASN1 structure */
99
100static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
101 const ASN1_ITEM *it)
102{
103 BIO *b64;
104 int r;
105 b64 = BIO_new(BIO_f_base64());
106 if (b64 == NULL) {
107 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
108 return 0;
109 }
110 /*
111 * prepend the b64 BIO so all data is base64 encoded.
112 */
113 out = BIO_push(b64, out);
114 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
115 (void)BIO_flush(out);
116 BIO_pop(out);
117 BIO_free(b64);
118 return r;
119}
120
121/* Streaming ASN1 PEM write */
122
123int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
124 const char *hdr, const ASN1_ITEM *it)
125{
126 int r;
127 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
128 r = B64_write_ASN1(out, val, in, flags, it);
129 BIO_printf(out, "-----END %s-----\n", hdr);
130 return r;
131}
132
133static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it, ASN1_VALUE **x,
134 OSSL_LIB_CTX *libctx, const char *propq)
135{
136 BIO *b64;
137 ASN1_VALUE *val;
138
139 if ((b64 = BIO_new(BIO_f_base64())) == NULL) {
140 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
141 return 0;
142 }
143 bio = BIO_push(b64, bio);
144 val = ASN1_item_d2i_bio_ex(it, bio, x, libctx, propq);
145 if (!val)
146 ERR_raise(ERR_LIB_ASN1, ASN1_R_DECODE_ERROR);
147 (void)BIO_flush(bio);
148 BIO_pop(bio);
149 BIO_free(b64);
150 return val;
151}
152
153/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
154
155static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
156{
157 const EVP_MD *md;
158 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
159 have_unknown = 0;
160 write_comma = 0;
161 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
162 if (write_comma)
163 BIO_write(out, ",", 1);
164 write_comma = 1;
165 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
166 md = EVP_get_digestbynid(md_nid);
167 if (md && md->md_ctrl) {
168 int rv;
169 char *micstr;
170 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
171 if (rv > 0) {
172 BIO_puts(out, micstr);
173 OPENSSL_free(micstr);
174 continue;
175 }
176 if (rv != -2)
177 goto err;
178 }
179 switch (md_nid) {
180 case NID_sha1:
181 BIO_puts(out, "sha1");
182 break;
183
184 case NID_md5:
185 BIO_puts(out, "md5");
186 break;
187
188 case NID_sha256:
189 BIO_puts(out, "sha-256");
190 break;
191
192 case NID_sha384:
193 BIO_puts(out, "sha-384");
194 break;
195
196 case NID_sha512:
197 BIO_puts(out, "sha-512");
198 break;
199
200 case NID_id_GostR3411_94:
201 BIO_puts(out, "gostr3411-94");
202 goto err;
203
204 case NID_id_GostR3411_2012_256:
205 BIO_puts(out, "gostr3411-2012-256");
206 goto err;
207
208 case NID_id_GostR3411_2012_512:
209 BIO_puts(out, "gostr3411-2012-512");
210 goto err;
211
212 default:
213 if (have_unknown) {
214 write_comma = 0;
215 } else {
216 BIO_puts(out, "unknown");
217 have_unknown = 1;
218 }
219 break;
220
221 }
222 }
223
224 ret = 1;
225 err:
226
227 return ret;
228
229}
230
231/* SMIME sender */
232
233int SMIME_write_ASN1_ex(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
234 int ctype_nid, int econt_nid,
235 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it,
236 OSSL_LIB_CTX *libctx, const char *propq)
237{
238 char bound[33], c;
239 int i;
240 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
241 const char *msg_type = NULL;
242
243 if (flags & SMIME_OLDMIME)
244 mime_prefix = "application/x-pkcs7-";
245 else
246 mime_prefix = "application/pkcs7-";
247
248 if (flags & SMIME_CRLFEOL)
249 mime_eol = "\r\n";
250 else
251 mime_eol = "\n";
252 if ((flags & SMIME_DETACHED) && data) {
253 /* We want multipart/signed */
254 /* Generate a random boundary */
255 if (RAND_bytes_ex(libctx, (unsigned char *)bound, 32, 0) <= 0)
256 return 0;
257 for (i = 0; i < 32; i++) {
258 c = bound[i] & 0xf;
259 if (c < 10)
260 c += '0';
261 else
262 c += 'A' - 10;
263 bound[i] = c;
264 }
265 bound[32] = 0;
266 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
267 BIO_printf(bio, "Content-Type: multipart/signed;");
268 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
269 BIO_puts(bio, " micalg=\"");
270 asn1_write_micalg(bio, mdalgs);
271 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
272 bound, mime_eol, mime_eol);
273 BIO_printf(bio, "This is an S/MIME signed message%s%s",
274 mime_eol, mime_eol);
275 /* Now write out the first part */
276 BIO_printf(bio, "------%s%s", bound, mime_eol);
277 if (!asn1_output_data(bio, data, val, flags, it))
278 return 0;
279 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
280
281 /* Headers for signature */
282
283 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
284 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
285 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
286 BIO_printf(bio, "Content-Disposition: attachment;");
287 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
288 B64_write_ASN1(bio, val, NULL, 0, it);
289 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
290 mime_eol, mime_eol);
291 return 1;
292 }
293
294 /* Determine smime-type header */
295
296 if (ctype_nid == NID_pkcs7_enveloped) {
297 msg_type = "enveloped-data";
298 } else if (ctype_nid == NID_pkcs7_signed) {
299 if (econt_nid == NID_id_smime_ct_receipt)
300 msg_type = "signed-receipt";
301 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
302 msg_type = "signed-data";
303 else
304 msg_type = "certs-only";
305 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
306 msg_type = "compressed-data";
307 cname = "smime.p7z";
308 }
309 /* MIME headers */
310 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
311 BIO_printf(bio, "Content-Disposition: attachment;");
312 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
313 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
314 if (msg_type)
315 BIO_printf(bio, " smime-type=%s;", msg_type);
316 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
317 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
318 mime_eol, mime_eol);
319 if (!B64_write_ASN1(bio, val, data, flags, it))
320 return 0;
321 BIO_printf(bio, "%s", mime_eol);
322 return 1;
323}
324
325int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
326 int ctype_nid, int econt_nid,
327 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
328{
329 return SMIME_write_ASN1_ex(bio, val, data, flags, ctype_nid, econt_nid,
330 mdalgs, it, NULL, NULL);
331}
332
333/* Handle output of ASN1 data */
334
335/* cannot constify val because of CMS_dataFinal() */
336static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
337 const ASN1_ITEM *it)
338{
339 BIO *tmpbio;
340 const ASN1_AUX *aux = it->funcs;
341 ASN1_STREAM_ARG sarg;
342 int rv = 1;
343
344 /*
345 * If data is not detached or resigning then the output BIO is already
346 * set up to finalise when it is written through.
347 */
348 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
349 SMIME_crlf_copy(data, out, flags);
350 return 1;
351 }
352
353 if (!aux || !aux->asn1_cb) {
354 ERR_raise(ERR_LIB_ASN1, ASN1_R_STREAMING_NOT_SUPPORTED);
355 return 0;
356 }
357
358 sarg.out = out;
359 sarg.ndef_bio = NULL;
360 sarg.boundary = NULL;
361
362 /* Let ASN1 code prepend any needed BIOs */
363
364 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
365 return 0;
366
367 /* Copy data across, passing through filter BIOs for processing */
368 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
369
370 /* Finalize structure */
371 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
372 rv = 0;
373
374 /* Now remove any digests prepended to the BIO */
375
376 while (sarg.ndef_bio != out) {
377 tmpbio = BIO_pop(sarg.ndef_bio);
378 BIO_free(sarg.ndef_bio);
379 sarg.ndef_bio = tmpbio;
380 }
381
382 return rv;
383
384}
385
386/*
387 * SMIME reader: handle multipart/signed and opaque signing. in multipart
388 * case the content is placed in a memory BIO pointed to by "bcont". In
389 * opaque this is set to NULL
390 */
391
392ASN1_VALUE *SMIME_read_ASN1_ex(BIO *bio, int flags, BIO **bcont,
393 const ASN1_ITEM *it, ASN1_VALUE **x,
394 OSSL_LIB_CTX *libctx, const char *propq)
395{
396 BIO *asnin;
397 STACK_OF(MIME_HEADER) *headers = NULL;
398 STACK_OF(BIO) *parts = NULL;
399 MIME_HEADER *hdr;
400 MIME_PARAM *prm;
401 ASN1_VALUE *val;
402 int ret;
403
404 if (bcont)
405 *bcont = NULL;
406
407 if ((headers = mime_parse_hdr(bio)) == NULL) {
408 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_PARSE_ERROR);
409 return NULL;
410 }
411
412 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
413 || hdr->value == NULL) {
414 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
415 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_CONTENT_TYPE);
416 return NULL;
417 }
418
419 /* Handle multipart/signed */
420
421 if (strcmp(hdr->value, "multipart/signed") == 0) {
422 /* Split into two parts */
423 prm = mime_param_find(hdr, "boundary");
424 if (prm == NULL || prm->param_value == NULL) {
425 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
426 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
427 return NULL;
428 }
429 ret = multi_split(bio, flags, prm->param_value, &parts);
430 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
431 if (!ret || (sk_BIO_num(parts) != 2)) {
432 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
433 sk_BIO_pop_free(parts, BIO_vfree);
434 return NULL;
435 }
436
437 /* Parse the signature piece */
438 asnin = sk_BIO_value(parts, 1);
439
440 if ((headers = mime_parse_hdr(asnin)) == NULL) {
441 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
442 sk_BIO_pop_free(parts, BIO_vfree);
443 return NULL;
444 }
445
446 /* Get content type */
447
448 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
449 || hdr->value == NULL) {
450 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
451 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
452 sk_BIO_pop_free(parts, BIO_vfree);
453 return NULL;
454 }
455
456 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
457 strcmp(hdr->value, "application/pkcs7-signature")) {
458 ERR_raise_data(ERR_LIB_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE,
459 "type: %s", hdr->value);
460 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
461 sk_BIO_pop_free(parts, BIO_vfree);
462 return NULL;
463 }
464 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
465 /* Read in ASN1 */
466 if ((val = b64_read_asn1(asnin, it, x, libctx, propq)) == NULL) {
467 ERR_raise(ERR_LIB_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
468 sk_BIO_pop_free(parts, BIO_vfree);
469 return NULL;
470 }
471
472 if (bcont) {
473 *bcont = sk_BIO_value(parts, 0);
474 BIO_free(asnin);
475 sk_BIO_free(parts);
476 } else {
477 sk_BIO_pop_free(parts, BIO_vfree);
478 }
479 return val;
480 }
481
482 /* OK, if not multipart/signed try opaque signature */
483
484 if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
485 strcmp(hdr->value, "application/pkcs7-mime")) {
486 ERR_raise_data(ERR_LIB_ASN1, ASN1_R_INVALID_MIME_TYPE,
487 "type: %s", hdr->value);
488 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
489 return NULL;
490 }
491
492 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
493
494 if ((val = b64_read_asn1(bio, it, x, libctx, propq)) == NULL) {
495 ERR_raise(ERR_LIB_ASN1, ASN1_R_ASN1_PARSE_ERROR);
496 return NULL;
497 }
498 return val;
499}
500
501ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
502{
503 return SMIME_read_ASN1_ex(bio, 0, bcont, it, NULL, NULL, NULL);
504}
505
506/* Copy text from one BIO to another making the output CRLF at EOL */
507int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
508{
509 BIO *bf;
510 char eol;
511 int len;
512 char linebuf[MAX_SMLEN];
513 /*
514 * Buffer output so we don't write one line at a time. This is useful
515 * when streaming as we don't end up with one OCTET STRING per line.
516 */
517 bf = BIO_new(BIO_f_buffer());
518 if (bf == NULL)
519 return 0;
520 out = BIO_push(bf, out);
521 if (flags & SMIME_BINARY) {
522 while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
523 BIO_write(out, linebuf, len);
524 } else {
525 int eolcnt = 0;
526 if (flags & SMIME_TEXT)
527 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
528 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
529 eol = strip_eol(linebuf, &len, flags);
530 if (len > 0) {
531 /* Not EOF: write out all CRLF */
532 if (flags & SMIME_ASCIICRLF) {
533 int i;
534 for (i = 0; i < eolcnt; i++)
535 BIO_write(out, "\r\n", 2);
536 eolcnt = 0;
537 }
538 BIO_write(out, linebuf, len);
539 if (eol)
540 BIO_write(out, "\r\n", 2);
541 } else if (flags & SMIME_ASCIICRLF) {
542 eolcnt++;
543 } else if (eol) {
544 BIO_write(out, "\r\n", 2);
545 }
546 }
547 }
548 (void)BIO_flush(out);
549 BIO_pop(out);
550 BIO_free(bf);
551 return 1;
552}
553
554/* Strip off headers if they are text/plain */
555int SMIME_text(BIO *in, BIO *out)
556{
557 char iobuf[4096];
558 int len;
559 STACK_OF(MIME_HEADER) *headers;
560 MIME_HEADER *hdr;
561
562 if ((headers = mime_parse_hdr(in)) == NULL) {
563 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_PARSE_ERROR);
564 return 0;
565 }
566 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
567 || hdr->value == NULL) {
568 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_NO_CONTENT_TYPE);
569 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
570 return 0;
571 }
572 if (strcmp(hdr->value, "text/plain")) {
573 ERR_raise_data(ERR_LIB_ASN1, ASN1_R_INVALID_MIME_TYPE,
574 "type: %s", hdr->value);
575 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
576 return 0;
577 }
578 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
579 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
580 BIO_write(out, iobuf, len);
581 if (len < 0)
582 return 0;
583 return 1;
584}
585
586/*
587 * Split a multipart/XXX message body into component parts: result is
588 * canonical parts in a STACK of bios
589 */
590
591static int multi_split(BIO *bio, int flags, const char *bound, STACK_OF(BIO) **ret)
592{
593 char linebuf[MAX_SMLEN];
594 int len, blen;
595 int eol = 0, next_eol = 0;
596 BIO *bpart = NULL;
597 STACK_OF(BIO) *parts;
598 char state, part, first;
599
600 blen = strlen(bound);
601 part = 0;
602 state = 0;
603 first = 1;
604 parts = sk_BIO_new_null();
605 *ret = parts;
606 if (*ret == NULL)
607 return 0;
608 while ((len = BIO_get_line(bio, linebuf, MAX_SMLEN)) > 0) {
609 state = mime_bound_check(linebuf, len, bound, blen);
610 if (state == 1) {
611 first = 1;
612 part++;
613 } else if (state == 2) {
614 if (!sk_BIO_push(parts, bpart)) {
615 BIO_free(bpart);
616 return 0;
617 }
618 return 1;
619 } else if (part != 0) {
620 /* Strip (possibly CR +) LF from linebuf */
621 next_eol = strip_eol(linebuf, &len, flags);
622 if (first) {
623 first = 0;
624 if (bpart)
625 if (!sk_BIO_push(parts, bpart)) {
626 BIO_free(bpart);
627 return 0;
628 }
629 bpart = BIO_new(BIO_s_mem());
630 if (bpart == NULL)
631 return 0;
632 BIO_set_mem_eof_return(bpart, 0);
633 } else if (eol) {
634 if (
635#ifndef OPENSSL_NO_CMS
636 (flags & CMS_BINARY) == 0
637#else
638 1
639#endif
640 || (flags & SMIME_CRLFEOL) != 0)
641 BIO_write(bpart, "\r\n", 2);
642 else
643 BIO_write(bpart, "\n", 1);
644 }
645 eol = next_eol;
646 if (len > 0)
647 BIO_write(bpart, linebuf, len);
648 }
649 }
650 BIO_free(bpart);
651 return 0;
652}
653
654/* This is the big one: parse MIME header lines up to message body */
655
656#define MIME_INVALID 0
657#define MIME_START 1
658#define MIME_TYPE 2
659#define MIME_NAME 3
660#define MIME_VALUE 4
661#define MIME_QUOTE 5
662#define MIME_COMMENT 6
663
664static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
665{
666 char *p, *q, c;
667 char *ntmp;
668 char linebuf[MAX_SMLEN];
669 MIME_HEADER *mhdr = NULL, *new_hdr = NULL;
670 STACK_OF(MIME_HEADER) *headers;
671 int len, state, save_state = 0;
672
673 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
674 if (headers == NULL)
675 return NULL;
676 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
677 /* If whitespace at line start then continuation line */
678 if (mhdr && ossl_isspace(linebuf[0]))
679 state = MIME_NAME;
680 else
681 state = MIME_START;
682 ntmp = NULL;
683 /* Go through all characters */
684 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
685 p++) {
686
687 /*
688 * State machine to handle MIME headers if this looks horrible
689 * that's because it *is*
690 */
691
692 switch (state) {
693 case MIME_START:
694 if (c == ':') {
695 state = MIME_TYPE;
696 *p = 0;
697 ntmp = strip_ends(q);
698 q = p + 1;
699 }
700 break;
701
702 case MIME_TYPE:
703 if (c == ';') {
704 mime_debug("Found End Value\n");
705 *p = 0;
706 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
707 if (new_hdr == NULL)
708 goto err;
709 if (!sk_MIME_HEADER_push(headers, new_hdr))
710 goto err;
711 mhdr = new_hdr;
712 new_hdr = NULL;
713 ntmp = NULL;
714 q = p + 1;
715 state = MIME_NAME;
716 } else if (c == '(') {
717 save_state = state;
718 state = MIME_COMMENT;
719 }
720 break;
721
722 case MIME_COMMENT:
723 if (c == ')') {
724 state = save_state;
725 }
726 break;
727
728 case MIME_NAME:
729 if (c == '=') {
730 state = MIME_VALUE;
731 *p = 0;
732 ntmp = strip_ends(q);
733 q = p + 1;
734 }
735 break;
736
737 case MIME_VALUE:
738 if (c == ';') {
739 state = MIME_NAME;
740 *p = 0;
741 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
742 ntmp = NULL;
743 q = p + 1;
744 } else if (c == '"') {
745 mime_debug("Found Quote\n");
746 state = MIME_QUOTE;
747 } else if (c == '(') {
748 save_state = state;
749 state = MIME_COMMENT;
750 }
751 break;
752
753 case MIME_QUOTE:
754 if (c == '"') {
755 mime_debug("Found Match Quote\n");
756 state = MIME_VALUE;
757 }
758 break;
759 }
760 }
761
762 if (state == MIME_TYPE) {
763 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
764 if (new_hdr == NULL)
765 goto err;
766 if (!sk_MIME_HEADER_push(headers, new_hdr))
767 goto err;
768 mhdr = new_hdr;
769 new_hdr = NULL;
770 } else if (state == MIME_VALUE) {
771 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
772 }
773 if (p == linebuf)
774 break; /* Blank line means end of headers */
775 }
776
777 return headers;
778
779 err:
780 mime_hdr_free(new_hdr);
781 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
782 return NULL;
783}
784
785static char *strip_ends(char *name)
786{
787 return strip_end(strip_start(name));
788}
789
790/* Strip a parameter of whitespace from start of param */
791static char *strip_start(char *name)
792{
793 char *p, c;
794 /* Look for first non whitespace or quote */
795 for (p = name; (c = *p); p++) {
796 if (c == '"') {
797 /* Next char is start of string if non null */
798 if (p[1])
799 return p + 1;
800 /* Else null string */
801 return NULL;
802 }
803 if (!ossl_isspace(c))
804 return p;
805 }
806 return NULL;
807}
808
809/* As above but strip from end of string : maybe should handle brackets? */
810static char *strip_end(char *name)
811{
812 char *p, c;
813 if (!name)
814 return NULL;
815 /* Look for first non whitespace or quote */
816 for (p = name + strlen(name) - 1; p >= name; p--) {
817 c = *p;
818 if (c == '"') {
819 if (p - 1 == name)
820 return NULL;
821 *p = 0;
822 return name;
823 }
824 if (ossl_isspace(c))
825 *p = 0;
826 else
827 return name;
828 }
829 return NULL;
830}
831
832static MIME_HEADER *mime_hdr_new(const char *name, const char *value)
833{
834 MIME_HEADER *mhdr = NULL;
835 char *tmpname = NULL, *tmpval = NULL, *p;
836
837 if (name) {
838 if ((tmpname = OPENSSL_strdup(name)) == NULL)
839 return NULL;
840 for (p = tmpname; *p; p++)
841 *p = ossl_tolower(*p);
842 }
843 if (value) {
844 if ((tmpval = OPENSSL_strdup(value)) == NULL)
845 goto err;
846 for (p = tmpval; *p; p++)
847 *p = ossl_tolower(*p);
848 }
849 mhdr = OPENSSL_malloc(sizeof(*mhdr));
850 if (mhdr == NULL)
851 goto err;
852 mhdr->name = tmpname;
853 mhdr->value = tmpval;
854 if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
855 goto err;
856 return mhdr;
857
858 err:
859 OPENSSL_free(tmpname);
860 OPENSSL_free(tmpval);
861 OPENSSL_free(mhdr);
862 return NULL;
863}
864
865static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value)
866{
867 char *tmpname = NULL, *tmpval = NULL, *p;
868 MIME_PARAM *mparam = NULL;
869
870 if (name) {
871 tmpname = OPENSSL_strdup(name);
872 if (!tmpname)
873 goto err;
874 for (p = tmpname; *p; p++)
875 *p = ossl_tolower(*p);
876 }
877 if (value) {
878 tmpval = OPENSSL_strdup(value);
879 if (!tmpval)
880 goto err;
881 }
882 /* Parameter values are case sensitive so leave as is */
883 mparam = OPENSSL_malloc(sizeof(*mparam));
884 if (mparam == NULL)
885 goto err;
886 mparam->param_name = tmpname;
887 mparam->param_value = tmpval;
888 if (!sk_MIME_PARAM_push(mhdr->params, mparam))
889 goto err;
890 return 1;
891 err:
892 OPENSSL_free(tmpname);
893 OPENSSL_free(tmpval);
894 OPENSSL_free(mparam);
895 return 0;
896}
897
898static int mime_hdr_cmp(const MIME_HEADER *const *a,
899 const MIME_HEADER *const *b)
900{
901 if ((*a)->name == NULL || (*b)->name == NULL)
902 return ((*a)->name != NULL) - ((*b)->name != NULL);
903
904 return strcmp((*a)->name, (*b)->name);
905}
906
907static int mime_param_cmp(const MIME_PARAM *const *a,
908 const MIME_PARAM *const *b)
909{
910 if ((*a)->param_name == NULL || (*b)->param_name == NULL)
911 return ((*a)->param_name != NULL) - ((*b)->param_name != NULL);
912 return strcmp((*a)->param_name, (*b)->param_name);
913}
914
915/* Find a header with a given name (if possible) */
916
917static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name)
918{
919 MIME_HEADER htmp;
920 int idx;
921
922 htmp.name = (char *)name;
923 htmp.value = NULL;
924 htmp.params = NULL;
925
926 idx = sk_MIME_HEADER_find(hdrs, &htmp);
927 return sk_MIME_HEADER_value(hdrs, idx);
928}
929
930static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name)
931{
932 MIME_PARAM param;
933 int idx;
934
935 param.param_name = (char *)name;
936 param.param_value = NULL;
937 idx = sk_MIME_PARAM_find(hdr->params, &param);
938 return sk_MIME_PARAM_value(hdr->params, idx);
939}
940
941static void mime_hdr_free(MIME_HEADER *hdr)
942{
943 if (hdr == NULL)
944 return;
945 OPENSSL_free(hdr->name);
946 OPENSSL_free(hdr->value);
947 if (hdr->params)
948 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
949 OPENSSL_free(hdr);
950}
951
952static void mime_param_free(MIME_PARAM *param)
953{
954 OPENSSL_free(param->param_name);
955 OPENSSL_free(param->param_value);
956 OPENSSL_free(param);
957}
958
959/*-
960 * Check for a multipart boundary. Returns:
961 * 0 : no boundary
962 * 1 : part boundary
963 * 2 : final boundary
964 */
965static int mime_bound_check(char *line, int linelen, const char *bound, int blen)
966{
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 */
975 if ((strncmp(line, "--", 2) == 0)
976 && strncmp(line + 2, bound, blen) == 0) {
977 if (strncmp(line + blen + 2, "--", 2) == 0)
978 return 2;
979 else
980 return 1;
981 }
982 return 0;
983}
984
985static int strip_eol(char *linebuf, int *plen, int flags)
986{
987 int len = *plen;
988 char *p, c;
989 int is_eol = 0;
990
991#ifndef OPENSSL_NO_CMS
992 if ((flags & CMS_BINARY) != 0) {
993 if (len <= 0 || linebuf[len - 1] != '\n')
994 return 0;
995 if ((flags & SMIME_CRLFEOL) != 0) {
996 if (len <= 1 || linebuf[len - 2] != '\r')
997 return 0;
998 len--;
999 }
1000 len--;
1001 *plen = len;
1002 return 1;
1003 }
1004#endif
1005
1006 for (p = linebuf + len - 1; len > 0; len--, p--) {
1007 c = *p;
1008 if (c == '\n') {
1009 is_eol = 1;
1010 } else if (is_eol && (flags & SMIME_ASCIICRLF) != 0 && c == 32) {
1011 /* Strip trailing space on a line; 32 == ASCII for ' ' */
1012 continue;
1013 } else if (c != '\r') {
1014 break;
1015 }
1016 }
1017 *plen = len;
1018 return is_eol;
1019}
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette