2
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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/* ====================================================================
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* Copyright (c) 1999-2003 The OpenSSL Project. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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* 6. Redistributions of any form whatsoever must retain the following
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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#include <openssl/rand.h>
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#include <openssl/x509.h>
65
/* MIME and related routines */
67
/* MIME format structures
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* Note that all are translated to lower case apart from
69
* parameter values. Quotes are stripped off
73
char *param_name; /* Param name e.g. "micalg" */
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char *param_value; /* Param value e.g. "sha1" */
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DECLARE_STACK_OF(MIME_PARAM)
78
IMPLEMENT_STACK_OF(MIME_PARAM)
81
char *name; /* Name of line e.g. "content-type" */
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char *value; /* Value of line e.g. "text/plain" */
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STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
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DECLARE_STACK_OF(MIME_HEADER)
87
IMPLEMENT_STACK_OF(MIME_HEADER)
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static int B64_write_PKCS7(BIO *bio, PKCS7 *p7);
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static PKCS7 *B64_read_PKCS7(BIO *bio);
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static char * strip_ends(char *name);
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static char * strip_start(char *name);
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static char * strip_end(char *name);
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static MIME_HEADER *mime_hdr_new(char *name, char *value);
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static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
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static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
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static int mime_hdr_cmp(const MIME_HEADER * const *a,
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const MIME_HEADER * const *b);
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static int mime_param_cmp(const MIME_PARAM * const *a,
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const MIME_PARAM * const *b);
101
static void mime_param_free(MIME_PARAM *param);
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static int mime_bound_check(char *line, int linelen, char *bound, int blen);
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static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
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static int strip_eol(char *linebuf, int *plen);
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static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
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static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
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static void mime_hdr_free(MIME_HEADER *hdr);
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#define MAX_SMLEN 1024
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#define mime_debug(x) /* x */
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typedef void (*stkfree)();
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/* Base 64 read and write of PKCS#7 structure */
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static int B64_write_PKCS7(BIO *bio, PKCS7 *p7)
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if(!(b64 = BIO_new(BIO_f_base64()))) {
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PKCS7err(PKCS7_F_B64_WRITE_PKCS7,ERR_R_MALLOC_FAILURE);
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bio = BIO_push(b64, bio);
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i2d_PKCS7_bio(bio, p7);
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static PKCS7 *B64_read_PKCS7(BIO *bio)
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if(!(b64 = BIO_new(BIO_f_base64()))) {
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PKCS7err(PKCS7_F_B64_READ_PKCS7,ERR_R_MALLOC_FAILURE);
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bio = BIO_push(b64, bio);
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if(!(p7 = d2i_PKCS7_bio(bio, NULL)))
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PKCS7err(PKCS7_F_B64_READ_PKCS7,PKCS7_R_DECODE_ERROR);
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int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags)
155
char *mime_prefix, *mime_eol;
156
if (flags & PKCS7_NOOLDMIMETYPE)
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mime_prefix = "application/pkcs7-";
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mime_prefix = "application/x-pkcs7-";
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if (flags & PKCS7_CRLFEOL)
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if((flags & PKCS7_DETACHED) && data) {
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/* We want multipart/signed */
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/* Generate a random boundary */
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RAND_pseudo_bytes((unsigned char *)bound, 32);
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for(i = 0; i < 32; i++) {
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BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
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BIO_printf(bio, "Content-Type: multipart/signed;");
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BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
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BIO_printf(bio, " micalg=sha1; boundary=\"----%s\"%s%s",
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bound, mime_eol, mime_eol);
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BIO_printf(bio, "This is an S/MIME signed message%s%s",
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/* Now write out the first part */
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BIO_printf(bio, "------%s%s", bound, mime_eol);
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SMIME_crlf_copy(data, bio, flags);
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BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
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/* Headers for signature */
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BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
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BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
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BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
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BIO_printf(bio, "Content-Disposition: attachment;");
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BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
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B64_write_PKCS7(bio, p7);
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BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound,
202
BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
203
BIO_printf(bio, "Content-Disposition: attachment;");
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BIO_printf(bio, " filename=\"smime.p7m\"%s", mime_eol);
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BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
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BIO_printf(bio, " name=\"smime.p7m\"%s", mime_eol);
207
BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
209
B64_write_PKCS7(bio, p7);
210
BIO_printf(bio, "%s", mime_eol);
214
/* SMIME reader: handle multipart/signed and opaque signing.
215
* in multipart case the content is placed in a memory BIO
216
* pointed to by "bcont". In opaque this is set to NULL
219
PKCS7 *SMIME_read_PKCS7(BIO *bio, BIO **bcont)
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STACK_OF(MIME_HEADER) *headers = NULL;
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STACK_OF(BIO) *parts = NULL;
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if(bcont) *bcont = NULL;
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if (!(headers = mime_parse_hdr(bio))) {
232
PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_PARSE_ERROR);
236
if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
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sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_CONTENT_TYPE);
242
/* Handle multipart/signed */
244
if(!strcmp(hdr->value, "multipart/signed")) {
245
/* Split into two parts */
246
prm = mime_param_find(hdr, "boundary");
247
if(!prm || !prm->param_value) {
248
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BOUNDARY);
252
ret = multi_split(bio, prm->param_value, &parts);
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sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
254
if(!ret || (sk_BIO_num(parts) != 2) ) {
255
PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BODY_FAILURE);
256
sk_BIO_pop_free(parts, BIO_vfree);
260
/* Parse the signature piece */
261
p7in = sk_BIO_value(parts, 1);
263
if (!(headers = mime_parse_hdr(p7in))) {
264
PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_SIG_PARSE_ERROR);
265
sk_BIO_pop_free(parts, BIO_vfree);
269
/* Get content type */
271
if(!(hdr = mime_hdr_find(headers, "content-type")) ||
273
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_SIG_CONTENT_TYPE);
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if(strcmp(hdr->value, "application/x-pkcs7-signature") &&
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strcmp(hdr->value, "application/pkcs7-signature")) {
280
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
281
PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_SIG_INVALID_MIME_TYPE);
282
ERR_add_error_data(2, "type: ", hdr->value);
283
sk_BIO_pop_free(parts, BIO_vfree);
286
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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if(!(p7 = B64_read_PKCS7(p7in))) {
289
PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_PKCS7_SIG_PARSE_ERROR);
290
sk_BIO_pop_free(parts, BIO_vfree);
295
*bcont = sk_BIO_value(parts, 0);
298
} else sk_BIO_pop_free(parts, BIO_vfree);
302
/* OK, if not multipart/signed try opaque signature */
304
if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
305
strcmp (hdr->value, "application/pkcs7-mime")) {
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PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_INVALID_MIME_TYPE);
307
ERR_add_error_data(2, "type: ", hdr->value);
308
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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if(!(p7 = B64_read_PKCS7(bio))) {
315
PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_PKCS7_PARSE_ERROR);
322
/* Copy text from one BIO to another making the output CRLF at EOL */
323
int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
327
char linebuf[MAX_SMLEN];
328
if(flags & PKCS7_BINARY) {
329
while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
330
BIO_write(out, linebuf, len);
333
if(flags & PKCS7_TEXT) BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
334
while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
335
eol = strip_eol(linebuf, &len);
337
BIO_write(out, linebuf, len);
338
if(eol) BIO_write(out, "\r\n", 2);
343
/* Strip off headers if they are text/plain */
344
int SMIME_text(BIO *in, BIO *out)
348
STACK_OF(MIME_HEADER) *headers;
351
if (!(headers = mime_parse_hdr(in))) {
352
PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_PARSE_ERROR);
355
if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
356
PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_NO_CONTENT_TYPE);
357
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
360
if (strcmp (hdr->value, "text/plain")) {
361
PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_INVALID_MIME_TYPE);
362
ERR_add_error_data(2, "type: ", hdr->value);
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sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
366
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
367
while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
368
BIO_write(out, iobuf, len);
372
/* Split a multipart/XXX message body into component parts: result is
373
* canonical parts in a STACK of bios
376
static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
378
char linebuf[MAX_SMLEN];
380
int eol = 0, next_eol = 0;
382
STACK_OF(BIO) *parts;
383
char state, part, first;
385
blen = strlen(bound);
389
parts = sk_BIO_new_null();
391
while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
392
state = mime_bound_check(linebuf, len, bound, blen);
396
} else if(state == 2) {
397
sk_BIO_push(parts, bpart);
400
/* Strip CR+LF from linebuf */
401
next_eol = strip_eol(linebuf, &len);
404
if(bpart) sk_BIO_push(parts, bpart);
405
bpart = BIO_new(BIO_s_mem());
406
BIO_set_mem_eof_return(bpart, 0);
408
BIO_write(bpart, "\r\n", 2);
411
BIO_write(bpart, linebuf, len);
417
/* This is the big one: parse MIME header lines up to message body */
419
#define MIME_INVALID 0
425
#define MIME_COMMENT 6
428
static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
432
char linebuf[MAX_SMLEN];
433
MIME_HEADER *mhdr = NULL;
434
STACK_OF(MIME_HEADER) *headers;
435
int len, state, save_state = 0;
437
headers = sk_MIME_HEADER_new(mime_hdr_cmp);
438
while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
439
/* If whitespace at line start then continuation line */
440
if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME;
441
else state = MIME_START;
443
/* Go through all characters */
444
for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
446
/* State machine to handle MIME headers
447
* if this looks horrible that's because it *is*
455
ntmp = strip_ends(q);
462
mime_debug("Found End Value\n");
464
mhdr = mime_hdr_new(ntmp, strip_ends(q));
465
sk_MIME_HEADER_push(headers, mhdr);
469
} else if(c == '(') {
471
state = MIME_COMMENT;
485
ntmp = strip_ends(q);
494
mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
497
} else if (c == '"') {
498
mime_debug("Found Quote\n");
500
} else if(c == '(') {
502
state = MIME_COMMENT;
508
mime_debug("Found Match Quote\n");
515
if(state == MIME_TYPE) {
516
mhdr = mime_hdr_new(ntmp, strip_ends(q));
517
sk_MIME_HEADER_push(headers, mhdr);
518
} else if(state == MIME_VALUE)
519
mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
520
if(p == linebuf) break; /* Blank line means end of headers */
527
static char *strip_ends(char *name)
529
return strip_end(strip_start(name));
532
/* Strip a parameter of whitespace from start of param */
533
static char *strip_start(char *name)
536
/* Look for first non white space or quote */
537
for(p = name; (c = *p) ;p++) {
539
/* Next char is start of string if non null */
540
if(p[1]) return p + 1;
541
/* Else null string */
544
if(!isspace((unsigned char)c)) return p;
549
/* As above but strip from end of string : maybe should handle brackets? */
550
static char *strip_end(char *name)
553
if(!name) return NULL;
554
/* Look for first non white space or quote */
555
for(p = name + strlen(name) - 1; p >= name ;p--) {
558
if(p - 1 == name) return NULL;
562
if(isspace((unsigned char)c)) *p = 0;
568
static MIME_HEADER *mime_hdr_new(char *name, char *value)
571
char *tmpname, *tmpval, *p;
574
if(!(tmpname = BUF_strdup(name))) return NULL;
575
for(p = tmpname ; *p; p++) {
582
} else tmpname = NULL;
584
if(!(tmpval = BUF_strdup(value))) return NULL;
585
for(p = tmpval ; *p; p++) {
592
} else tmpval = NULL;
593
mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER));
594
if(!mhdr) return NULL;
595
mhdr->name = tmpname;
596
mhdr->value = tmpval;
597
if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL;
601
static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
603
char *tmpname, *tmpval, *p;
607
tmpname = BUF_strdup(name);
608
if(!tmpname) return 0;
609
for(p = tmpname ; *p; p++) {
616
} else tmpname = NULL;
618
tmpval = BUF_strdup(value);
619
if(!tmpval) return 0;
620
} else tmpval = NULL;
621
/* Parameter values are case sensitive so leave as is */
622
mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM));
623
if(!mparam) return 0;
624
mparam->param_name = tmpname;
625
mparam->param_value = tmpval;
626
sk_MIME_PARAM_push(mhdr->params, mparam);
630
static int mime_hdr_cmp(const MIME_HEADER * const *a,
631
const MIME_HEADER * const *b)
633
return(strcmp((*a)->name, (*b)->name));
636
static int mime_param_cmp(const MIME_PARAM * const *a,
637
const MIME_PARAM * const *b)
639
return(strcmp((*a)->param_name, (*b)->param_name));
642
/* Find a header with a given name (if possible) */
644
static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
649
idx = sk_MIME_HEADER_find(hdrs, &htmp);
650
if(idx < 0) return NULL;
651
return sk_MIME_HEADER_value(hdrs, idx);
654
static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
658
param.param_name = name;
659
idx = sk_MIME_PARAM_find(hdr->params, ¶m);
660
if(idx < 0) return NULL;
661
return sk_MIME_PARAM_value(hdr->params, idx);
664
static void mime_hdr_free(MIME_HEADER *hdr)
666
if(hdr->name) OPENSSL_free(hdr->name);
667
if(hdr->value) OPENSSL_free(hdr->value);
668
if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
672
static void mime_param_free(MIME_PARAM *param)
674
if(param->param_name) OPENSSL_free(param->param_name);
675
if(param->param_value) OPENSSL_free(param->param_value);
679
/* Check for a multipart boundary. Returns:
684
static int mime_bound_check(char *line, int linelen, char *bound, int blen)
686
if(linelen == -1) linelen = strlen(line);
687
if(blen == -1) blen = strlen(bound);
688
/* Quickly eliminate if line length too short */
689
if(blen + 2 > linelen) return 0;
690
/* Check for part boundary */
691
if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
692
if(!strncmp(line + blen + 2, "--", 2)) return 2;
698
static int strip_eol(char *linebuf, int *plen)
703
p = linebuf + len - 1;
704
for (p = linebuf + len - 1; len > 0; len--, p--)