2 * Copyright 2008-2020 The OpenSSL Project Authors. All Rights Reserved.
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
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"
25 * Generalised MIME like utilities for streaming ASN1. Although many have a
26 * PKCS7/CMS like flavour others are more general purpose.
30 * MIME format structures Note that all are translated to lower case apart
31 * from parameter values. Quotes are stripped off
34 struct mime_param_st {
35 char *param_name; /* Param name e.g. "micalg" */
36 char *param_value; /* Param value e.g. "sha1" */
39 struct mime_header_st {
40 char *name; /* Name of line e.g. "content-type" */
41 char *value; /* Value of line e.g. "text/plain" */
42 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
45 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
47 static char *strip_ends(char *name);
48 static char *strip_start(char *name);
49 static char *strip_end(char *name);
50 static MIME_HEADER *mime_hdr_new(const char *name, const char *value);
51 static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value);
52 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
53 static int mime_hdr_cmp(const MIME_HEADER *const *a,
54 const MIME_HEADER *const *b);
55 static int mime_param_cmp(const MIME_PARAM *const *a,
56 const MIME_PARAM *const *b);
57 static void mime_param_free(MIME_PARAM *param);
58 static int mime_bound_check(char *line, int linelen, const char *bound, int blen);
59 static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret);
60 static int strip_eol(char *linebuf, int *plen, int flags);
61 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
62 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name);
63 static void mime_hdr_free(MIME_HEADER *hdr);
65 #define MAX_SMLEN 1024
66 #define mime_debug(x) /* x */
68 /* Output an ASN1 structure in BER format streaming if necessary */
70 /* unfortunately cannot constify this due to CMS_stream() and PKCS7_stream() */
71 int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
74 /* If streaming create stream BIO and copy all content through it */
75 if (flags & SMIME_STREAM) {
77 bio = BIO_new_NDEF(out, val, it);
79 ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
82 SMIME_crlf_copy(in, bio, flags);
84 /* Free up successive BIOs until we hit the old output BIO */
92 * else just write out ASN1 structure which will have all content stored
96 ASN1_item_i2d_bio(it, out, val);
100 /* Base 64 read and write of ASN1 structure */
102 static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
107 b64 = BIO_new(BIO_f_base64());
109 ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
113 * prepend the b64 BIO so all data is base64 encoded.
115 out = BIO_push(b64, out);
116 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
117 (void)BIO_flush(out);
123 /* Streaming ASN1 PEM write */
125 int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
126 const char *hdr, const ASN1_ITEM *it)
129 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
130 r = B64_write_ASN1(out, val, in, flags, it);
131 BIO_printf(out, "-----END %s-----\n", hdr);
135 static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it, ASN1_VALUE **x)
140 if ((b64 = BIO_new(BIO_f_base64())) == NULL) {
141 ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
144 bio = BIO_push(b64, bio);
145 val = ASN1_item_d2i_bio(it, bio, x);
147 ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
148 (void)BIO_flush(bio);
154 /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
156 static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
159 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
162 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
164 BIO_write(out, ",", 1);
166 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
167 md = EVP_get_digestbynid(md_nid);
168 if (md && md->md_ctrl) {
171 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
173 BIO_puts(out, micstr);
174 OPENSSL_free(micstr);
182 BIO_puts(out, "sha1");
186 BIO_puts(out, "md5");
190 BIO_puts(out, "sha-256");
194 BIO_puts(out, "sha-384");
198 BIO_puts(out, "sha-512");
201 case NID_id_GostR3411_94:
202 BIO_puts(out, "gostr3411-94");
205 case NID_id_GostR3411_2012_256:
206 BIO_puts(out, "gostr3411-2012-256");
209 case NID_id_GostR3411_2012_512:
210 BIO_puts(out, "gostr3411-2012-512");
217 BIO_puts(out, "unknown");
234 int SMIME_write_ASN1_with_libctx(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
235 int ctype_nid, int econt_nid,
236 STACK_OF(X509_ALGOR) *mdalgs,
238 OPENSSL_CTX *libctx, const char *propq)
242 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
243 const char *msg_type = NULL;
245 if (flags & SMIME_OLDMIME)
246 mime_prefix = "application/x-pkcs7-";
248 mime_prefix = "application/pkcs7-";
250 if (flags & SMIME_CRLFEOL)
254 if ((flags & SMIME_DETACHED) && data) {
255 /* We want multipart/signed */
256 /* Generate a random boundary */
257 if (RAND_bytes_ex(libctx, (unsigned char *)bound, 32) <= 0)
259 for (i = 0; i < 32; i++) {
268 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
269 BIO_printf(bio, "Content-Type: multipart/signed;");
270 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
271 BIO_puts(bio, " micalg=\"");
272 asn1_write_micalg(bio, mdalgs);
273 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
274 bound, mime_eol, mime_eol);
275 BIO_printf(bio, "This is an S/MIME signed message%s%s",
277 /* Now write out the first part */
278 BIO_printf(bio, "------%s%s", bound, mime_eol);
279 if (!asn1_output_data(bio, data, val, flags, it))
281 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
283 /* Headers for signature */
285 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
286 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
287 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
288 BIO_printf(bio, "Content-Disposition: attachment;");
289 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
290 B64_write_ASN1(bio, val, NULL, 0, it);
291 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
296 /* Determine smime-type header */
298 if (ctype_nid == NID_pkcs7_enveloped)
299 msg_type = "enveloped-data";
300 else if (ctype_nid == NID_pkcs7_signed) {
301 if (econt_nid == NID_id_smime_ct_receipt)
302 msg_type = "signed-receipt";
303 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
304 msg_type = "signed-data";
306 msg_type = "certs-only";
307 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
308 msg_type = "compressed-data";
312 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
313 BIO_printf(bio, "Content-Disposition: attachment;");
314 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
315 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
317 BIO_printf(bio, " smime-type=%s;", msg_type);
318 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
319 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
321 if (!B64_write_ASN1(bio, val, data, flags, it))
323 BIO_printf(bio, "%s", mime_eol);
327 int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
328 int ctype_nid, int econt_nid,
329 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
331 return SMIME_write_ASN1_with_libctx(bio, val, data, flags, ctype_nid,
332 econt_nid, mdalgs, it, NULL, NULL);
335 /* Handle output of ASN1 data */
337 /* cannot constify val because of CMS_dataFinal() */
338 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
342 const ASN1_AUX *aux = it->funcs;
343 ASN1_STREAM_ARG sarg;
347 * If data is not detached or resigning then the output BIO is already
348 * set up to finalise when it is written through.
350 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
351 SMIME_crlf_copy(data, out, flags);
355 if (!aux || !aux->asn1_cb) {
356 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
361 sarg.ndef_bio = NULL;
362 sarg.boundary = NULL;
364 /* Let ASN1 code prepend any needed BIOs */
366 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
369 /* Copy data across, passing through filter BIOs for processing */
370 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
372 /* Finalize structure */
373 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
376 /* Now remove any digests prepended to the BIO */
378 while (sarg.ndef_bio != out) {
379 tmpbio = BIO_pop(sarg.ndef_bio);
380 BIO_free(sarg.ndef_bio);
381 sarg.ndef_bio = tmpbio;
389 * SMIME reader: handle multipart/signed and opaque signing. in multipart
390 * case the content is placed in a memory BIO pointed to by "bcont". In
391 * opaque this is set to NULL
394 ASN1_VALUE *SMIME_read_ASN1_ex(BIO *bio, BIO **bcont, const ASN1_ITEM *it,
398 STACK_OF(MIME_HEADER) *headers = NULL;
399 STACK_OF(BIO) *parts = NULL;
408 if ((headers = mime_parse_hdr(bio)) == NULL) {
409 ASN1err(0, ASN1_R_MIME_PARSE_ERROR);
413 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
414 || hdr->value == NULL) {
415 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
416 ASN1err(0, ASN1_R_NO_CONTENT_TYPE);
420 /* Handle multipart/signed */
422 if (strcmp(hdr->value, "multipart/signed") == 0) {
423 /* Split into two parts */
424 prm = mime_param_find(hdr, "boundary");
425 if (prm == NULL || prm->param_value == NULL) {
426 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
427 ASN1err(0, ASN1_R_NO_MULTIPART_BOUNDARY);
430 ret = multi_split(bio, prm->param_value, &parts);
431 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
432 if (!ret || (sk_BIO_num(parts) != 2)) {
433 ASN1err(0, ASN1_R_NO_MULTIPART_BODY_FAILURE);
434 sk_BIO_pop_free(parts, BIO_vfree);
438 /* Parse the signature piece */
439 asnin = sk_BIO_value(parts, 1);
441 if ((headers = mime_parse_hdr(asnin)) == NULL) {
442 ASN1err(0, ASN1_R_MIME_SIG_PARSE_ERROR);
443 sk_BIO_pop_free(parts, BIO_vfree);
447 /* Get content type */
449 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
450 || hdr->value == NULL) {
451 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
452 ASN1err(0, ASN1_R_NO_SIG_CONTENT_TYPE);
453 sk_BIO_pop_free(parts, BIO_vfree);
457 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
458 strcmp(hdr->value, "application/pkcs7-signature")) {
459 ASN1err(0, ASN1_R_SIG_INVALID_MIME_TYPE);
460 ERR_add_error_data(2, "type: ", hdr->value);
461 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
462 sk_BIO_pop_free(parts, BIO_vfree);
465 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
467 if ((val = b64_read_asn1(asnin, it, x)) == NULL) {
468 ASN1err(0, ASN1_R_ASN1_SIG_PARSE_ERROR);
469 sk_BIO_pop_free(parts, BIO_vfree);
474 *bcont = sk_BIO_value(parts, 0);
478 sk_BIO_pop_free(parts, BIO_vfree);
482 /* OK, if not multipart/signed try opaque signature */
484 if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
485 strcmp(hdr->value, "application/pkcs7-mime")) {
486 ASN1err(0, ASN1_R_INVALID_MIME_TYPE);
487 ERR_add_error_data(2, "type: ", hdr->value);
488 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
492 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
494 if ((val = b64_read_asn1(bio, it, x)) == NULL) {
495 ASN1err(0, ASN1_R_ASN1_PARSE_ERROR);
501 ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
503 return SMIME_read_ASN1_ex(bio, bcont, it, NULL);
506 /* Copy text from one BIO to another making the output CRLF at EOL */
507 int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
512 char linebuf[MAX_SMLEN];
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.
517 bf = BIO_new(BIO_f_buffer());
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);
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);
531 /* Not EOF: write out all CRLF */
532 if (flags & SMIME_ASCIICRLF) {
534 for (i = 0; i < eolcnt; i++)
535 BIO_write(out, "\r\n", 2);
538 BIO_write(out, linebuf, len);
540 BIO_write(out, "\r\n", 2);
541 } else if (flags & SMIME_ASCIICRLF)
544 BIO_write(out, "\r\n", 2);
547 (void)BIO_flush(out);
553 /* Strip off headers if they are text/plain */
554 int SMIME_text(BIO *in, BIO *out)
558 STACK_OF(MIME_HEADER) *headers;
561 if ((headers = mime_parse_hdr(in)) == NULL) {
562 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
565 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
566 || hdr->value == NULL) {
567 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
568 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
571 if (strcmp(hdr->value, "text/plain")) {
572 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
573 ERR_add_error_data(2, "type: ", hdr->value);
574 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
577 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
578 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
579 BIO_write(out, iobuf, len);
586 * Split a multipart/XXX message body into component parts: result is
587 * canonical parts in a STACK of bios
590 static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret)
592 char linebuf[MAX_SMLEN];
594 int eol = 0, next_eol = 0;
596 STACK_OF(BIO) *parts;
597 char state, part, first;
599 blen = strlen(bound);
603 parts = sk_BIO_new_null();
607 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
608 state = mime_bound_check(linebuf, len, bound, blen);
612 } else if (state == 2) {
613 if (!sk_BIO_push(parts, bpart)) {
619 /* Strip CR+LF from linebuf */
620 next_eol = strip_eol(linebuf, &len, 0);
624 if (!sk_BIO_push(parts, bpart)) {
628 bpart = BIO_new(BIO_s_mem());
631 BIO_set_mem_eof_return(bpart, 0);
633 BIO_write(bpart, "\r\n", 2);
636 BIO_write(bpart, linebuf, len);
643 /* This is the big one: parse MIME header lines up to message body */
645 #define MIME_INVALID 0
651 #define MIME_COMMENT 6
653 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
657 char linebuf[MAX_SMLEN];
658 MIME_HEADER *mhdr = NULL, *new_hdr = NULL;
659 STACK_OF(MIME_HEADER) *headers;
660 int len, state, save_state = 0;
662 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
665 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
666 /* If whitespace at line start then continuation line */
667 if (mhdr && ossl_isspace(linebuf[0]))
672 /* Go through all characters */
673 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
677 * State machine to handle MIME headers if this looks horrible
678 * that's because it *is*
686 ntmp = strip_ends(q);
693 mime_debug("Found End Value\n");
695 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
698 if (!sk_MIME_HEADER_push(headers, new_hdr))
705 } else if (c == '(') {
707 state = MIME_COMMENT;
721 ntmp = strip_ends(q);
730 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
733 } else if (c == '"') {
734 mime_debug("Found Quote\n");
736 } else if (c == '(') {
738 state = MIME_COMMENT;
744 mime_debug("Found Match Quote\n");
751 if (state == MIME_TYPE) {
752 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
755 if (!sk_MIME_HEADER_push(headers, new_hdr))
759 } else if (state == MIME_VALUE)
760 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
762 break; /* Blank line means end of headers */
768 mime_hdr_free(new_hdr);
769 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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 whitespace 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 (!ossl_isspace(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 whitespace or quote */
804 for (p = name + strlen(name) - 1; p >= name; p--) {
820 static MIME_HEADER *mime_hdr_new(const char *name, const char *value)
822 MIME_HEADER *mhdr = NULL;
823 char *tmpname = NULL, *tmpval = NULL, *p;
826 if ((tmpname = OPENSSL_strdup(name)) == NULL)
828 for (p = tmpname; *p; p++)
829 *p = ossl_tolower(*p);
832 if ((tmpval = OPENSSL_strdup(value)) == NULL)
834 for (p = tmpval; *p; p++)
835 *p = ossl_tolower(*p);
837 mhdr = OPENSSL_malloc(sizeof(*mhdr));
840 mhdr->name = tmpname;
841 mhdr->value = tmpval;
842 if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
847 OPENSSL_free(tmpname);
848 OPENSSL_free(tmpval);
853 static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value)
855 char *tmpname = NULL, *tmpval = NULL, *p;
856 MIME_PARAM *mparam = NULL;
859 tmpname = OPENSSL_strdup(name);
862 for (p = tmpname; *p; p++)
863 *p = ossl_tolower(*p);
866 tmpval = OPENSSL_strdup(value);
870 /* Parameter values are case sensitive so leave as is */
871 mparam = OPENSSL_malloc(sizeof(*mparam));
874 mparam->param_name = tmpname;
875 mparam->param_value = tmpval;
876 if (!sk_MIME_PARAM_push(mhdr->params, mparam))
880 OPENSSL_free(tmpname);
881 OPENSSL_free(tmpval);
882 OPENSSL_free(mparam);
886 static int mime_hdr_cmp(const MIME_HEADER *const *a,
887 const MIME_HEADER *const *b)
889 if (!(*a)->name || !(*b)->name)
890 return ! !(*a)->name - ! !(*b)->name;
892 return strcmp((*a)->name, (*b)->name);
895 static int mime_param_cmp(const MIME_PARAM *const *a,
896 const MIME_PARAM *const *b)
898 if (!(*a)->param_name || !(*b)->param_name)
899 return ! !(*a)->param_name - ! !(*b)->param_name;
900 return strcmp((*a)->param_name, (*b)->param_name);
903 /* Find a header with a given name (if possible) */
905 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name)
910 htmp.name = (char *)name;
914 idx = sk_MIME_HEADER_find(hdrs, &htmp);
915 return sk_MIME_HEADER_value(hdrs, idx);
918 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name)
923 param.param_name = (char *)name;
924 param.param_value = NULL;
925 idx = sk_MIME_PARAM_find(hdr->params, ¶m);
926 return sk_MIME_PARAM_value(hdr->params, idx);
929 static void mime_hdr_free(MIME_HEADER *hdr)
933 OPENSSL_free(hdr->name);
934 OPENSSL_free(hdr->value);
936 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
940 static void mime_param_free(MIME_PARAM *param)
942 OPENSSL_free(param->param_name);
943 OPENSSL_free(param->param_value);
948 * Check for a multipart boundary. Returns:
953 static int mime_bound_check(char *line, int linelen, const char *bound, int blen)
956 linelen = strlen(line);
958 blen = strlen(bound);
959 /* Quickly eliminate if line length too short */
960 if (blen + 2 > linelen)
962 /* Check for part boundary */
963 if ((strncmp(line, "--", 2) == 0)
964 && strncmp(line + 2, bound, blen) == 0) {
965 if (strncmp(line + blen + 2, "--", 2) == 0)
973 static int strip_eol(char *linebuf, int *plen, int flags)
979 for (p = linebuf + len - 1; len > 0; len--, p--) {
983 } else if (is_eol && flags & SMIME_ASCIICRLF && c == 32) {
984 /* Strip trailing space on a line; 32 == ASCII for ' ' */
986 } else if (c != '\r') {