3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6 /* ====================================================================
7 * Copyright (c) 1999-2008 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
59 #include <openssl/rand.h>
60 #include <openssl/x509.h>
61 #include <openssl/asn1.h>
62 #include <openssl/asn1t.h>
63 #include "asn1_locl.h"
66 * Generalised MIME like utilities for streaming ASN1. Although many have a
67 * PKCS7/CMS like flavour others are more general purpose.
71 * MIME format structures Note that all are translated to lower case apart
72 * from parameter values. Quotes are stripped off
76 char *param_name; /* Param name e.g. "micalg" */
77 char *param_value; /* Param value e.g. "sha1" */
80 DECLARE_STACK_OF(MIME_PARAM)
83 char *name; /* Name of line e.g. "content-type" */
84 char *value; /* Value of line e.g. "text/plain" */
85 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
88 DECLARE_STACK_OF(MIME_HEADER)
90 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
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, int flags);
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);
110 #define MAX_SMLEN 1024
111 #define mime_debug(x) /* x */
113 /* Output an ASN1 structure in BER format streaming if necessary */
115 int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
118 /* If streaming create stream BIO and copy all content through it */
119 if (flags & SMIME_STREAM) {
121 bio = BIO_new_NDEF(out, val, it);
123 ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
126 SMIME_crlf_copy(in, bio, flags);
127 (void)BIO_flush(bio);
128 /* Free up successive BIOs until we hit the old output BIO */
133 } while (bio != out);
136 * else just write out ASN1 structure which will have all content stored
140 ASN1_item_i2d_bio(it, out, val);
144 /* Base 64 read and write of ASN1 structure */
146 static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
151 b64 = BIO_new(BIO_f_base64());
153 ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
157 * prepend the b64 BIO so all data is base64 encoded.
159 out = BIO_push(b64, out);
160 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
161 (void)BIO_flush(out);
167 /* Streaming ASN1 PEM write */
169 int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
170 const char *hdr, const ASN1_ITEM *it)
173 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
174 r = B64_write_ASN1(out, val, in, flags, it);
175 BIO_printf(out, "-----END %s-----\n", hdr);
179 static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
183 if (!(b64 = BIO_new(BIO_f_base64()))) {
184 ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
187 bio = BIO_push(b64, bio);
188 val = ASN1_item_d2i_bio(it, bio, NULL);
190 ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
191 (void)BIO_flush(bio);
197 /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
199 static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
202 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
205 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
207 BIO_write(out, ",", 1);
209 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
210 md = EVP_get_digestbynid(md_nid);
211 if (md && md->md_ctrl) {
214 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
216 BIO_puts(out, micstr);
217 OPENSSL_free(micstr);
225 BIO_puts(out, "sha1");
229 BIO_puts(out, "md5");
233 BIO_puts(out, "sha-256");
237 BIO_puts(out, "sha-384");
241 BIO_puts(out, "sha-512");
244 case NID_id_GostR3411_94:
245 BIO_puts(out, "gostr3411-94");
252 BIO_puts(out, "unknown");
269 int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
270 int ctype_nid, int econt_nid,
271 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
275 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
276 const char *msg_type = NULL;
277 if (flags & SMIME_OLDMIME)
278 mime_prefix = "application/x-pkcs7-";
280 mime_prefix = "application/pkcs7-";
282 if (flags & SMIME_CRLFEOL)
286 if ((flags & SMIME_DETACHED) && data) {
287 /* We want multipart/signed */
288 /* Generate a random boundary */
289 RAND_pseudo_bytes((unsigned char *)bound, 32);
290 for (i = 0; i < 32; i++) {
299 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
300 BIO_printf(bio, "Content-Type: multipart/signed;");
301 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
302 BIO_puts(bio, " micalg=\"");
303 asn1_write_micalg(bio, mdalgs);
304 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
305 bound, mime_eol, mime_eol);
306 BIO_printf(bio, "This is an S/MIME signed message%s%s",
308 /* Now write out the first part */
309 BIO_printf(bio, "------%s%s", bound, mime_eol);
310 if (!asn1_output_data(bio, data, val, flags, it))
312 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
314 /* Headers for signature */
316 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
317 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
318 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
319 BIO_printf(bio, "Content-Disposition: attachment;");
320 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
321 B64_write_ASN1(bio, val, NULL, 0, it);
322 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
327 /* Determine smime-type header */
329 if (ctype_nid == NID_pkcs7_enveloped)
330 msg_type = "enveloped-data";
331 else if (ctype_nid == NID_pkcs7_signed) {
332 if (econt_nid == NID_id_smime_ct_receipt)
333 msg_type = "signed-receipt";
334 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
335 msg_type = "signed-data";
337 msg_type = "certs-only";
338 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
339 msg_type = "compressed-data";
343 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
344 BIO_printf(bio, "Content-Disposition: attachment;");
345 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
346 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
348 BIO_printf(bio, " smime-type=%s;", msg_type);
349 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
350 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
352 if (!B64_write_ASN1(bio, val, data, flags, it))
354 BIO_printf(bio, "%s", mime_eol);
358 /* Handle output of ASN1 data */
360 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
364 const ASN1_AUX *aux = it->funcs;
365 ASN1_STREAM_ARG sarg;
369 * If data is not deteched or resigning then the output BIO is already
370 * set up to finalise when it is written through.
372 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
373 SMIME_crlf_copy(data, out, flags);
377 if (!aux || !aux->asn1_cb) {
378 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
383 sarg.ndef_bio = NULL;
384 sarg.boundary = NULL;
386 /* Let ASN1 code prepend any needed BIOs */
388 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
391 /* Copy data across, passing through filter BIOs for processing */
392 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
394 /* Finalize structure */
395 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
398 /* Now remove any digests prepended to the BIO */
400 while (sarg.ndef_bio != out) {
401 tmpbio = BIO_pop(sarg.ndef_bio);
402 BIO_free(sarg.ndef_bio);
403 sarg.ndef_bio = tmpbio;
411 * SMIME reader: handle multipart/signed and opaque signing. in multipart
412 * case the content is placed in a memory BIO pointed to by "bcont". In
413 * opaque this is set to NULL
416 ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
419 STACK_OF(MIME_HEADER) *headers = NULL;
420 STACK_OF(BIO) *parts = NULL;
429 if (!(headers = mime_parse_hdr(bio))) {
430 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
434 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
435 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
436 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
440 /* Handle multipart/signed */
442 if (!strcmp(hdr->value, "multipart/signed")) {
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);
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);
458 /* Parse the signature piece */
459 asnin = sk_BIO_value(parts, 1);
461 if (!(headers = mime_parse_hdr(asnin))) {
462 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
463 sk_BIO_pop_free(parts, BIO_vfree);
467 /* Get content type */
469 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
470 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
471 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
475 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
476 strcmp(hdr->value, "application/pkcs7-signature")) {
477 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE);
478 ERR_add_error_data(2, "type: ", hdr->value);
479 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
480 sk_BIO_pop_free(parts, BIO_vfree);
483 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
485 if (!(val = b64_read_asn1(asnin, it))) {
486 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
487 sk_BIO_pop_free(parts, BIO_vfree);
492 *bcont = sk_BIO_value(parts, 0);
496 sk_BIO_pop_free(parts, BIO_vfree);
500 /* OK, if not multipart/signed try opaque signature */
502 if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
503 strcmp(hdr->value, "application/pkcs7-mime")) {
504 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
505 ERR_add_error_data(2, "type: ", hdr->value);
506 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
510 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
512 if (!(val = b64_read_asn1(bio, it))) {
513 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
520 /* Copy text from one BIO to another making the output CRLF at EOL */
521 int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
526 char linebuf[MAX_SMLEN];
528 * Buffer output so we don't write one line at a time. This is useful
529 * when streaming as we don't end up with one OCTET STRING per line.
531 bf = BIO_new(BIO_f_buffer());
534 out = BIO_push(bf, out);
535 if (flags & SMIME_BINARY) {
536 while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
537 BIO_write(out, linebuf, len);
540 if (flags & SMIME_TEXT)
541 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
542 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
543 eol = strip_eol(linebuf, &len, flags);
545 /* Not EOF: write out all CRLF */
546 if (flags & SMIME_ASCIICRLF) {
548 for (i = 0; i < eolcnt; i++)
549 BIO_write(out, "\r\n", 2);
552 BIO_write(out, linebuf, len);
554 BIO_write(out, "\r\n", 2);
555 } else if (flags & SMIME_ASCIICRLF)
558 BIO_write(out, "\r\n", 2);
561 (void)BIO_flush(out);
567 /* Strip off headers if they are text/plain */
568 int SMIME_text(BIO *in, BIO *out)
572 STACK_OF(MIME_HEADER) *headers;
575 if (!(headers = mime_parse_hdr(in))) {
576 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
579 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
580 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
581 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
584 if (strcmp(hdr->value, "text/plain")) {
585 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
586 ERR_add_error_data(2, "type: ", hdr->value);
587 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
590 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
591 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
592 BIO_write(out, iobuf, len);
599 * Split a multipart/XXX message body into component parts: result is
600 * canonical parts in a STACK of bios
603 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
605 char linebuf[MAX_SMLEN];
607 int eol = 0, next_eol = 0;
609 STACK_OF(BIO) *parts;
610 char state, part, first;
612 blen = strlen(bound);
616 parts = sk_BIO_new_null();
620 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
621 state = mime_bound_check(linebuf, len, bound, blen);
625 } else if (state == 2) {
626 if (!sk_BIO_push(parts, bpart)) {
632 /* Strip CR+LF from linebuf */
633 next_eol = strip_eol(linebuf, &len, 0);
637 if (!sk_BIO_push(parts, bpart)) {
641 bpart = BIO_new(BIO_s_mem());
644 BIO_set_mem_eof_return(bpart, 0);
646 BIO_write(bpart, "\r\n", 2);
649 BIO_write(bpart, linebuf, len);
657 /* This is the big one: parse MIME header lines up to message body */
659 #define MIME_INVALID 0
665 #define MIME_COMMENT 6
667 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
671 char linebuf[MAX_SMLEN];
672 MIME_HEADER *mhdr = NULL;
673 STACK_OF(MIME_HEADER) *headers;
674 int len, state, save_state = 0;
676 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
679 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
680 /* If whitespace at line start then continuation line */
681 if (mhdr && isspace((unsigned char)linebuf[0]))
686 /* Go through all characters */
687 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
691 * State machine to handle MIME headers if this looks horrible
692 * that's because it *is*
700 ntmp = strip_ends(q);
707 mime_debug("Found End Value\n");
709 mhdr = mime_hdr_new(ntmp, strip_ends(q));
710 sk_MIME_HEADER_push(headers, mhdr);
714 } else if (c == '(') {
716 state = MIME_COMMENT;
730 ntmp = strip_ends(q);
739 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
742 } else if (c == '"') {
743 mime_debug("Found Quote\n");
745 } else if (c == '(') {
747 state = MIME_COMMENT;
753 mime_debug("Found Match Quote\n");
760 if (state == MIME_TYPE) {
761 mhdr = mime_hdr_new(ntmp, strip_ends(q));
762 sk_MIME_HEADER_push(headers, mhdr);
763 } else if (state == MIME_VALUE)
764 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
766 break; /* Blank line means end of headers */
773 static char *strip_ends(char *name)
775 return strip_end(strip_start(name));
778 /* Strip a parameter of whitespace from start of param */
779 static char *strip_start(char *name)
782 /* Look for first non white space or quote */
783 for (p = name; (c = *p); p++) {
785 /* Next char is start of string if non null */
788 /* Else null string */
791 if (!isspace((unsigned char)c))
797 /* As above but strip from end of string : maybe should handle brackets? */
798 static char *strip_end(char *name)
803 /* Look for first non white space or quote */
804 for (p = name + strlen(name) - 1; p >= name; p--) {
812 if (isspace((unsigned char)c))
820 static MIME_HEADER *mime_hdr_new(char *name, char *value)
822 MIME_HEADER *mhdr = NULL;
823 char *tmpname = NULL, *tmpval = NULL, *p;
826 if (!(tmpname = BUF_strdup(name)))
828 for (p = tmpname; *p; p++) {
829 c = (unsigned char)*p;
837 if (!(tmpval = BUF_strdup(value)))
839 for (p = tmpval; *p; p++) {
840 c = (unsigned char)*p;
847 mhdr = (MIME_HEADER *)OPENSSL_malloc(sizeof(MIME_HEADER));
850 mhdr->name = tmpname;
851 mhdr->value = tmpval;
852 if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)))
858 OPENSSL_free(tmpname);
860 OPENSSL_free(tmpval);
866 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
868 char *tmpname = NULL, *tmpval = NULL, *p;
870 MIME_PARAM *mparam = NULL;
872 tmpname = BUF_strdup(name);
875 for (p = tmpname; *p; p++) {
876 c = (unsigned char)*p;
884 tmpval = BUF_strdup(value);
888 /* Parameter values are case sensitive so leave as is */
889 mparam = (MIME_PARAM *)OPENSSL_malloc(sizeof(MIME_PARAM));
892 mparam->param_name = tmpname;
893 mparam->param_value = tmpval;
894 if (!sk_MIME_PARAM_push(mhdr->params, mparam))
899 OPENSSL_free(tmpname);
901 OPENSSL_free(tmpval);
903 OPENSSL_free(mparam);
907 static int mime_hdr_cmp(const MIME_HEADER *const *a,
908 const MIME_HEADER *const *b)
910 if (!(*a)->name || !(*b)->name)
911 return ! !(*a)->name - ! !(*b)->name;
913 return (strcmp((*a)->name, (*b)->name));
916 static int mime_param_cmp(const MIME_PARAM *const *a,
917 const MIME_PARAM *const *b)
919 if (!(*a)->param_name || !(*b)->param_name)
920 return ! !(*a)->param_name - ! !(*b)->param_name;
921 return (strcmp((*a)->param_name, (*b)->param_name));
924 /* Find a header with a given name (if possible) */
926 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
931 idx = sk_MIME_HEADER_find(hdrs, &htmp);
934 return sk_MIME_HEADER_value(hdrs, idx);
937 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
941 param.param_name = name;
942 idx = sk_MIME_PARAM_find(hdr->params, ¶m);
945 return sk_MIME_PARAM_value(hdr->params, idx);
948 static void mime_hdr_free(MIME_HEADER *hdr)
951 OPENSSL_free(hdr->name);
953 OPENSSL_free(hdr->value);
955 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
959 static void mime_param_free(MIME_PARAM *param)
961 if (param->param_name)
962 OPENSSL_free(param->param_name);
963 if (param->param_value)
964 OPENSSL_free(param->param_value);
969 * Check for a multipart boundary. Returns:
974 static int mime_bound_check(char *line, int linelen, char *bound, int blen)
977 linelen = strlen(line);
979 blen = strlen(bound);
980 /* Quickly eliminate if line length too short */
981 if (blen + 2 > linelen)
983 /* Check for part boundary */
984 if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
985 if (!strncmp(line + blen + 2, "--", 2))
993 static int strip_eol(char *linebuf, int *plen, int flags)
998 p = linebuf + len - 1;
999 for (p = linebuf + len - 1; len > 0; len--, p--) {
1003 else if (is_eol && flags & SMIME_ASCIICRLF && c < 33)