2 * Copyright 2008-2021 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"
23 * Generalised MIME like utilities for streaming ASN1. Although many have a
24 * PKCS7/CMS like flavour others are more general purpose.
28 * MIME format structures Note that all are translated to lower case apart
29 * from parameter values. Quotes are stripped off
32 struct mime_param_st {
33 char *param_name; /* Param name e.g. "micalg" */
34 char *param_value; /* Param value e.g. "sha1" */
37 struct 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 */
43 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
45 static char *strip_ends(char *name);
46 static char *strip_start(char *name);
47 static char *strip_end(char *name);
48 static MIME_HEADER *mime_hdr_new(const char *name, const char *value);
49 static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value);
50 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
51 static int mime_hdr_cmp(const MIME_HEADER *const *a,
52 const MIME_HEADER *const *b);
53 static int mime_param_cmp(const MIME_PARAM *const *a,
54 const MIME_PARAM *const *b);
55 static void mime_param_free(MIME_PARAM *param);
56 static int mime_bound_check(char *line, int linelen, const char *bound, int blen);
57 static int multi_split(BIO *bio, int flags, const char *bound, STACK_OF(BIO) **ret);
58 static int strip_eol(char *linebuf, int *plen, int flags);
59 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
60 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name);
61 static void mime_hdr_free(MIME_HEADER *hdr);
63 #define MAX_SMLEN 1024
64 #define mime_debug(x) /* x */
66 /* Output an ASN1 structure in BER format streaming if necessary */
68 /* unfortunately cannot constify this due to CMS_stream() and PKCS7_stream() */
69 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 ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
82 if (!SMIME_crlf_copy(in, bio, flags)) {
87 /* Free up successive BIOs until we hit the old output BIO */
95 * else just write out ASN1 structure which will have all content stored
99 ASN1_item_i2d_bio(it, out, val);
103 /* Base 64 read and write of ASN1 structure */
105 static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
110 b64 = BIO_new(BIO_f_base64());
112 ERR_raise(ERR_LIB_ASN1, ERR_R_BIO_LIB);
116 * prepend the b64 BIO so all data is base64 encoded.
118 out = BIO_push(b64, out);
119 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
120 (void)BIO_flush(out);
126 /* Streaming ASN1 PEM write */
128 int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
129 const char *hdr, const ASN1_ITEM *it)
132 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
133 r = B64_write_ASN1(out, val, in, flags, it);
134 BIO_printf(out, "-----END %s-----\n", hdr);
138 static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it, ASN1_VALUE **x,
139 OSSL_LIB_CTX *libctx, const char *propq)
144 if ((b64 = BIO_new(BIO_f_base64())) == NULL) {
145 ERR_raise(ERR_LIB_ASN1, ERR_R_BIO_LIB);
148 bio = BIO_push(b64, bio);
149 val = ASN1_item_d2i_bio_ex(it, bio, x, libctx, propq);
151 ERR_raise(ERR_LIB_ASN1, ASN1_R_DECODE_ERROR);
152 (void)BIO_flush(bio);
158 /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
160 static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
163 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
166 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
168 BIO_write(out, ",", 1);
170 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
171 md = EVP_get_digestbynid(md_nid);
172 if (md && md->md_ctrl) {
175 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
177 BIO_puts(out, micstr);
178 OPENSSL_free(micstr);
186 BIO_puts(out, "sha1");
190 BIO_puts(out, "md5");
194 BIO_puts(out, "sha-256");
198 BIO_puts(out, "sha-384");
202 BIO_puts(out, "sha-512");
205 case NID_id_GostR3411_94:
206 BIO_puts(out, "gostr3411-94");
209 case NID_id_GostR3411_2012_256:
210 BIO_puts(out, "gostr3411-2012-256");
213 case NID_id_GostR3411_2012_512:
214 BIO_puts(out, "gostr3411-2012-512");
221 BIO_puts(out, "unknown");
238 int SMIME_write_ASN1_ex(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
239 int ctype_nid, int econt_nid,
240 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it,
241 OSSL_LIB_CTX *libctx, const char *propq)
245 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
246 const char *msg_type = NULL;
248 if (flags & SMIME_OLDMIME)
249 mime_prefix = "application/x-pkcs7-";
251 mime_prefix = "application/pkcs7-";
253 if (flags & SMIME_CRLFEOL)
257 if ((flags & SMIME_DETACHED) && data) {
258 /* We want multipart/signed */
259 /* Generate a random boundary */
260 if (RAND_bytes_ex(libctx, (unsigned char *)bound, 32, 0) <= 0)
262 for (i = 0; i < 32; i++) {
271 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
272 BIO_printf(bio, "Content-Type: multipart/signed;");
273 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
274 BIO_puts(bio, " micalg=\"");
275 asn1_write_micalg(bio, mdalgs);
276 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
277 bound, mime_eol, mime_eol);
278 BIO_printf(bio, "This is an S/MIME signed message%s%s",
280 /* Now write out the first part */
281 BIO_printf(bio, "------%s%s", bound, mime_eol);
282 if (!asn1_output_data(bio, data, val, flags, it))
284 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
286 /* Headers for signature */
288 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
289 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
290 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
291 BIO_printf(bio, "Content-Disposition: attachment;");
292 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
293 B64_write_ASN1(bio, val, NULL, 0, it);
294 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
299 /* Determine smime-type header */
301 if (ctype_nid == NID_pkcs7_enveloped) {
302 msg_type = "enveloped-data";
303 } else if (ctype_nid == NID_pkcs7_signed) {
304 if (econt_nid == NID_id_smime_ct_receipt)
305 msg_type = "signed-receipt";
306 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
307 msg_type = "signed-data";
309 msg_type = "certs-only";
310 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
311 msg_type = "compressed-data";
315 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
316 BIO_printf(bio, "Content-Disposition: attachment;");
317 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
318 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
320 BIO_printf(bio, " smime-type=%s;", msg_type);
321 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
322 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
324 if (!B64_write_ASN1(bio, val, data, flags, it))
326 BIO_printf(bio, "%s", mime_eol);
330 int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
331 int ctype_nid, int econt_nid,
332 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
334 return SMIME_write_ASN1_ex(bio, val, data, flags, ctype_nid, econt_nid,
335 mdalgs, it, NULL, NULL);
338 /* Handle output of ASN1 data */
340 /* cannot constify val because of CMS_dataFinal() */
341 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
345 const ASN1_AUX *aux = it->funcs;
346 ASN1_STREAM_ARG sarg;
350 * If data is not detached or resigning then the output BIO is already
351 * set up to finalise when it is written through.
353 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
354 return SMIME_crlf_copy(data, out, flags);
357 if (!aux || !aux->asn1_cb) {
358 ERR_raise(ERR_LIB_ASN1, ASN1_R_STREAMING_NOT_SUPPORTED);
363 sarg.ndef_bio = NULL;
364 sarg.boundary = NULL;
366 /* Let ASN1 code prepend any needed BIOs */
368 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
371 /* Copy data across, passing through filter BIOs for processing */
372 if (!SMIME_crlf_copy(data, sarg.ndef_bio, flags))
375 /* Finalize structure */
376 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
379 /* Now remove any digests prepended to the BIO */
381 while (sarg.ndef_bio != out) {
382 tmpbio = BIO_pop(sarg.ndef_bio);
383 BIO_free(sarg.ndef_bio);
384 sarg.ndef_bio = tmpbio;
392 * SMIME reader: handle multipart/signed and opaque signing. in multipart
393 * case the content is placed in a memory BIO pointed to by "bcont". In
394 * opaque this is set to NULL
397 ASN1_VALUE *SMIME_read_ASN1_ex(BIO *bio, int flags, BIO **bcont,
398 const ASN1_ITEM *it, ASN1_VALUE **x,
399 OSSL_LIB_CTX *libctx, const char *propq)
402 STACK_OF(MIME_HEADER) *headers = NULL;
403 STACK_OF(BIO) *parts = NULL;
412 if ((headers = mime_parse_hdr(bio)) == NULL) {
413 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_PARSE_ERROR);
417 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
418 || hdr->value == NULL) {
419 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
420 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_CONTENT_TYPE);
424 /* Handle multipart/signed */
426 if (strcmp(hdr->value, "multipart/signed") == 0) {
427 /* Split into two parts */
428 prm = mime_param_find(hdr, "boundary");
429 if (prm == NULL || prm->param_value == NULL) {
430 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
431 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
434 ret = multi_split(bio, flags, prm->param_value, &parts);
435 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
436 if (!ret || (sk_BIO_num(parts) != 2)) {
437 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
438 sk_BIO_pop_free(parts, BIO_vfree);
442 /* Parse the signature piece */
443 asnin = sk_BIO_value(parts, 1);
445 if ((headers = mime_parse_hdr(asnin)) == NULL) {
446 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
447 sk_BIO_pop_free(parts, BIO_vfree);
451 /* Get content type */
453 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
454 || hdr->value == NULL) {
455 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
456 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
457 sk_BIO_pop_free(parts, BIO_vfree);
461 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
462 strcmp(hdr->value, "application/pkcs7-signature")) {
463 ERR_raise_data(ERR_LIB_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE,
464 "type: %s", hdr->value);
465 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
466 sk_BIO_pop_free(parts, BIO_vfree);
469 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
471 if ((val = b64_read_asn1(asnin, it, x, libctx, propq)) == NULL) {
472 ERR_raise(ERR_LIB_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
473 sk_BIO_pop_free(parts, BIO_vfree);
478 *bcont = sk_BIO_value(parts, 0);
482 sk_BIO_pop_free(parts, BIO_vfree);
487 /* OK, if not multipart/signed try opaque signature */
489 if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
490 strcmp(hdr->value, "application/pkcs7-mime")) {
491 ERR_raise_data(ERR_LIB_ASN1, ASN1_R_INVALID_MIME_TYPE,
492 "type: %s", hdr->value);
493 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
497 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
499 if ((val = b64_read_asn1(bio, it, x, libctx, propq)) == NULL) {
500 ERR_raise(ERR_LIB_ASN1, ASN1_R_ASN1_PARSE_ERROR);
506 ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
508 return SMIME_read_ASN1_ex(bio, 0, bcont, it, NULL, NULL, NULL);
511 /* Copy text from one BIO to another making the output CRLF at EOL */
512 int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
517 char linebuf[MAX_SMLEN];
520 * Buffer output so we don't write one line at a time. This is useful
521 * when streaming as we don't end up with one OCTET STRING per line.
523 bf = BIO_new(BIO_f_buffer());
525 ERR_raise(ERR_LIB_ASN1, ERR_R_BIO_LIB);
528 out = BIO_push(bf, out);
529 if (flags & SMIME_BINARY) {
530 while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
531 BIO_write(out, linebuf, len);
534 if (flags & SMIME_TEXT)
535 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
536 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
537 eol = strip_eol(linebuf, &len, flags);
539 /* Not EOF: write out all CRLF */
540 if (flags & SMIME_ASCIICRLF) {
542 for (i = 0; i < eolcnt; i++)
543 BIO_write(out, "\r\n", 2);
546 BIO_write(out, linebuf, len);
548 BIO_write(out, "\r\n", 2);
549 } else if (flags & SMIME_ASCIICRLF) {
552 BIO_write(out, "\r\n", 2);
556 ret = BIO_flush(out);
565 /* Strip off headers if they are text/plain */
566 int SMIME_text(BIO *in, BIO *out)
570 STACK_OF(MIME_HEADER) *headers;
573 if ((headers = mime_parse_hdr(in)) == NULL) {
574 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_PARSE_ERROR);
577 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
578 || hdr->value == NULL) {
579 ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_NO_CONTENT_TYPE);
580 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
583 if (strcmp(hdr->value, "text/plain")) {
584 ERR_raise_data(ERR_LIB_ASN1, ASN1_R_INVALID_MIME_TYPE,
585 "type: %s", hdr->value);
586 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
589 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
590 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
591 BIO_write(out, iobuf, len);
598 * Split a multipart/XXX message body into component parts: result is
599 * canonical parts in a STACK of bios
602 static int multi_split(BIO *bio, int flags, const char *bound, STACK_OF(BIO) **ret)
604 char linebuf[MAX_SMLEN];
606 int eol = 0, next_eol = 0;
608 STACK_OF(BIO) *parts;
609 char state, part, first;
611 blen = strlen(bound);
615 parts = sk_BIO_new_null();
619 while ((len = BIO_get_line(bio, linebuf, MAX_SMLEN)) > 0) {
620 state = mime_bound_check(linebuf, len, bound, blen);
624 } else if (state == 2) {
625 if (!sk_BIO_push(parts, bpart)) {
630 } else if (part != 0) {
631 /* Strip (possibly CR +) LF from linebuf */
632 next_eol = strip_eol(linebuf, &len, flags);
636 if (!sk_BIO_push(parts, bpart)) {
640 bpart = BIO_new(BIO_s_mem());
643 BIO_set_mem_eof_return(bpart, 0);
646 #ifndef OPENSSL_NO_CMS
647 (flags & CMS_BINARY) == 0
651 || (flags & SMIME_CRLFEOL) != 0)
652 BIO_write(bpart, "\r\n", 2);
654 BIO_write(bpart, "\n", 1);
658 BIO_write(bpart, linebuf, len);
665 /* This is the big one: parse MIME header lines up to message body */
667 #define MIME_INVALID 0
673 #define MIME_COMMENT 6
675 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
679 char linebuf[MAX_SMLEN];
680 MIME_HEADER *mhdr = NULL, *new_hdr = NULL;
681 STACK_OF(MIME_HEADER) *headers;
682 int len, state, save_state = 0;
684 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
687 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
688 /* If whitespace at line start then continuation line */
689 if (mhdr && ossl_isspace(linebuf[0]))
694 /* Go through all characters */
695 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
699 * State machine to handle MIME headers if this looks horrible
700 * that's because it *is*
708 ntmp = strip_ends(q);
715 mime_debug("Found End Value\n");
717 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
720 if (!sk_MIME_HEADER_push(headers, new_hdr))
727 } else if (c == '(') {
729 state = MIME_COMMENT;
743 ntmp = strip_ends(q);
752 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
755 } else if (c == '"') {
756 mime_debug("Found Quote\n");
758 } else if (c == '(') {
760 state = MIME_COMMENT;
766 mime_debug("Found Match Quote\n");
773 if (state == MIME_TYPE) {
774 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
777 if (!sk_MIME_HEADER_push(headers, new_hdr))
781 } else if (state == MIME_VALUE) {
782 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
785 break; /* Blank line means end of headers */
791 mime_hdr_free(new_hdr);
792 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
796 static char *strip_ends(char *name)
798 return strip_end(strip_start(name));
801 /* Strip a parameter of whitespace from start of param */
802 static char *strip_start(char *name)
805 /* Look for first non whitespace or quote */
806 for (p = name; (c = *p); p++) {
808 /* Next char is start of string if non null */
811 /* Else null string */
814 if (!ossl_isspace(c))
820 /* As above but strip from end of string : maybe should handle brackets? */
821 static char *strip_end(char *name)
826 /* Look for first non whitespace or quote */
827 for (p = name + strlen(name) - 1; p >= name; p--) {
843 static MIME_HEADER *mime_hdr_new(const char *name, const char *value)
845 MIME_HEADER *mhdr = NULL;
846 char *tmpname = NULL, *tmpval = NULL, *p;
849 if ((tmpname = OPENSSL_strdup(name)) == NULL)
851 for (p = tmpname; *p; p++)
852 *p = ossl_tolower(*p);
855 if ((tmpval = OPENSSL_strdup(value)) == NULL)
857 for (p = tmpval; *p; p++)
858 *p = ossl_tolower(*p);
860 mhdr = OPENSSL_malloc(sizeof(*mhdr));
863 mhdr->name = tmpname;
864 mhdr->value = tmpval;
865 if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
870 OPENSSL_free(tmpname);
871 OPENSSL_free(tmpval);
876 static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value)
878 char *tmpname = NULL, *tmpval = NULL, *p;
879 MIME_PARAM *mparam = NULL;
882 tmpname = OPENSSL_strdup(name);
885 for (p = tmpname; *p; p++)
886 *p = ossl_tolower(*p);
889 tmpval = OPENSSL_strdup(value);
893 /* Parameter values are case sensitive so leave as is */
894 mparam = OPENSSL_malloc(sizeof(*mparam));
897 mparam->param_name = tmpname;
898 mparam->param_value = tmpval;
899 if (!sk_MIME_PARAM_push(mhdr->params, mparam))
903 OPENSSL_free(tmpname);
904 OPENSSL_free(tmpval);
905 OPENSSL_free(mparam);
909 static int mime_hdr_cmp(const MIME_HEADER *const *a,
910 const MIME_HEADER *const *b)
912 if ((*a)->name == NULL || (*b)->name == NULL)
913 return ((*a)->name != NULL) - ((*b)->name != NULL);
915 return strcmp((*a)->name, (*b)->name);
918 static int mime_param_cmp(const MIME_PARAM *const *a,
919 const MIME_PARAM *const *b)
921 if ((*a)->param_name == NULL || (*b)->param_name == NULL)
922 return ((*a)->param_name != NULL) - ((*b)->param_name != NULL);
923 return strcmp((*a)->param_name, (*b)->param_name);
926 /* Find a header with a given name (if possible) */
928 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name)
933 htmp.name = (char *)name;
937 idx = sk_MIME_HEADER_find(hdrs, &htmp);
938 return sk_MIME_HEADER_value(hdrs, idx);
941 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name)
946 param.param_name = (char *)name;
947 param.param_value = NULL;
948 idx = sk_MIME_PARAM_find(hdr->params, ¶m);
949 return sk_MIME_PARAM_value(hdr->params, idx);
952 static void mime_hdr_free(MIME_HEADER *hdr)
956 OPENSSL_free(hdr->name);
957 OPENSSL_free(hdr->value);
959 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
963 static void mime_param_free(MIME_PARAM *param)
965 OPENSSL_free(param->param_name);
966 OPENSSL_free(param->param_value);
971 * Check for a multipart boundary. Returns:
976 static int mime_bound_check(char *line, int linelen, const char *bound, int blen)
979 linelen = strlen(line);
981 blen = strlen(bound);
982 /* Quickly eliminate if line length too short */
983 if (blen + 2 > linelen)
985 /* Check for part boundary */
986 if ((CHECK_AND_SKIP_PREFIX(line, "--")) && strncmp(line, bound, blen) == 0)
987 return HAS_PREFIX(line + blen, "--") ? 2 : 1;
991 static int strip_eol(char *linebuf, int *plen, int flags)
997 #ifndef OPENSSL_NO_CMS
998 if ((flags & CMS_BINARY) != 0) {
999 if (len <= 0 || linebuf[len - 1] != '\n')
1001 if ((flags & SMIME_CRLFEOL) != 0) {
1002 if (len <= 1 || linebuf[len - 2] != '\r')
1012 for (p = linebuf + len - 1; len > 0; len--, p--) {
1016 } else if (is_eol && (flags & SMIME_ASCIICRLF) != 0 && c == 32) {
1017 /* Strip trailing space on a line; 32 == ASCII for ' ' */
1019 } else if (c != '\r') {