crypto/openssl-0.9/crypto/pkcs7/pk7_mime.c

   1 /* pk7_mime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <ctype.h>
  61 #include "cryptlib.h"
  62 #include <openssl/rand.h>
  63 #include <openssl/x509.h>
  64
  65 /* MIME and related routines */
  66
  67 /* MIME format structures
  68  * Note that all are translated to lower case apart from
  69  * parameter values. Quotes are stripped off
  70  */
  71
  72 typedef struct {
  73 char *param_name;                       /* Param name e.g. "micalg" */
  74 char *param_value;                      /* Param value e.g. "sha1" */
  75 } MIME_PARAM;
  76
  77 DECLARE_STACK_OF(MIME_PARAM)
  78 IMPLEMENT_STACK_OF(MIME_PARAM)
  79
  80 typedef struct {
  81 char *name;                             /* Name of line e.g. "content-type" */
  82 char *value;                            /* Value of line e.g. "text/plain" */
  83 STACK_OF(MIME_PARAM) *params;           /* Zero or more parameters */
  84 } MIME_HEADER;
  85
  86 DECLARE_STACK_OF(MIME_HEADER)
  87 IMPLEMENT_STACK_OF(MIME_HEADER)
  88
  89 static int pkcs7_output_data(BIO *bio, BIO *data, PKCS7 *p7, int flags);
  90 static int B64_write_PKCS7(BIO *bio, PKCS7 *p7);
  91 static PKCS7 *B64_read_PKCS7(BIO *bio);
  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);
 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);
 109
 110 #define MAX_SMLEN 1024
 111 #define mime_debug(x) /* x */
 112
 113 /* Base 64 read and write of PKCS#7 structure */
 114
 115 static int B64_write_PKCS7(BIO *bio, PKCS7 *p7)
 116 {
 117         BIO *b64;
 118         if(!(b64 = BIO_new(BIO_f_base64()))) {
 119                 PKCS7err(PKCS7_F_B64_WRITE_PKCS7,ERR_R_MALLOC_FAILURE);
 120                 return 0;
 121         }
 122         bio = BIO_push(b64, bio);
 123         i2d_PKCS7_bio(bio, p7);
 124         (void)BIO_flush(bio);
 125         bio = BIO_pop(bio);
 126         BIO_free(b64);
 127         return 1;
 128 }
 129
 130 static PKCS7 *B64_read_PKCS7(BIO *bio)
 131 {
 132         BIO *b64;
 133         PKCS7 *p7;
 134         if(!(b64 = BIO_new(BIO_f_base64()))) {
 135                 PKCS7err(PKCS7_F_B64_READ_PKCS7,ERR_R_MALLOC_FAILURE);
 136                 return 0;
 137         }
 138         bio = BIO_push(b64, bio);
 139         if(!(p7 = d2i_PKCS7_bio(bio, NULL)))
 140                 PKCS7err(PKCS7_F_B64_READ_PKCS7,PKCS7_R_DECODE_ERROR);
 141         (void)BIO_flush(bio);
 142         bio = BIO_pop(bio);
 143         BIO_free(b64);
 144         return p7;
 145 }
 146
 147 /* SMIME sender */
 148
 149 int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags)
 150 {
 151         char bound[33], c;
 152         int i;
 153         char *mime_prefix, *mime_eol, *msg_type=NULL;
 154         if (flags & PKCS7_NOOLDMIMETYPE)
 155                 mime_prefix = "application/pkcs7-";
 156         else
 157                 mime_prefix = "application/x-pkcs7-";
 158
 159         if (flags & PKCS7_CRLFEOL)
 160                 mime_eol = "\r\n";
 161         else
 162                 mime_eol = "\n";
 163         if((flags & PKCS7_DETACHED) && data) {
 164         /* We want multipart/signed */
 165                 /* Generate a random boundary */
 166                 RAND_pseudo_bytes((unsigned char *)bound, 32);
 167                 for(i = 0; i < 32; i++) {
 168                         c = bound[i] & 0xf;
 169                         if(c < 10) c += '0';
 170                         else c += 'A' - 10;
 171                         bound[i] = c;
 172                 }
 173                 bound[32] = 0;
 174                 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
 175                 BIO_printf(bio, "Content-Type: multipart/signed;");
 176                 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
 177                 BIO_printf(bio, " micalg=sha1; boundary=\"----%s\"%s%s",
 178                                                 bound, mime_eol, mime_eol);
 179                 BIO_printf(bio, "This is an S/MIME signed message%s%s",
 180                                                 mime_eol, mime_eol);
 181                 /* Now write out the first part */
 182                 BIO_printf(bio, "------%s%s", bound, mime_eol);
 183                 pkcs7_output_data(bio, data, p7, flags);
 184                 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
 185
 186                 /* Headers for signature */
 187
 188                 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
 189                 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
 190                 BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
 191                                                                 mime_eol);
 192                 BIO_printf(bio, "Content-Disposition: attachment;");
 193                 BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
 194                                                         mime_eol, mime_eol);
 195                 B64_write_PKCS7(bio, p7);
 196                 BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound,
 197                                                         mime_eol, mime_eol);
 198                 return 1;
 199         }
 200
 201         /* Determine smime-type header */
 202
 203         if (PKCS7_type_is_enveloped(p7))
 204                 msg_type = "enveloped-data";
 205         else if (PKCS7_type_is_signed(p7))
 206                 {
 207                 /* If we have any signers it is signed-data othewise
 208                  * certs-only.
 209                  */
 210                 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 211                 sinfos = PKCS7_get_signer_info(p7);
 212                 if (sk_PKCS7_SIGNER_INFO_num(sinfos) > 0)
 213                         msg_type = "signed-data";
 214                 else
 215                         msg_type = "certs-only";
 216                 }
 217         /* MIME headers */
 218         BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
 219         BIO_printf(bio, "Content-Disposition: attachment;");
 220         BIO_printf(bio, " filename=\"smime.p7m\"%s", mime_eol);
 221         BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
 222         if (msg_type)
 223                 BIO_printf(bio, " smime-type=%s;", msg_type);
 224         BIO_printf(bio, " name=\"smime.p7m\"%s", mime_eol);
 225         BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
 226                                                 mime_eol, mime_eol);
 227         B64_write_PKCS7(bio, p7);
 228         BIO_printf(bio, "%s", mime_eol);
 229         return 1;
 230 }
 231
 232 /* Handle output of PKCS#7 data */
 233
 234
 235 static int pkcs7_output_data(BIO *out, BIO *data, PKCS7 *p7, int flags)
 236         {
 237         BIO *tmpbio, *p7bio;
 238
 239         if (!(flags & PKCS7_STREAM))
 240                 {
 241                 SMIME_crlf_copy(data, out, flags);
 242                 return 1;
 243                 }
 244
 245         /* Partial sign operation */
 246
 247         /* Initialize sign operation */
 248         p7bio = PKCS7_dataInit(p7, out);
 249
 250         /* Copy data across, computing digests etc */
 251         SMIME_crlf_copy(data, p7bio, flags);
 252
 253         /* Must be detached */
 254         PKCS7_set_detached(p7, 1);
 255
 256         /* Finalize signatures */
 257         PKCS7_dataFinal(p7, p7bio);
 258
 259         /* Now remove any digests prepended to the BIO */
 260
 261         while (p7bio != out)
 262                 {
 263                 tmpbio = BIO_pop(p7bio);
 264                 BIO_free(p7bio);
 265                 p7bio = tmpbio;
 266                 }
 267
 268         return 1;
 269
 270         }
 271
 272 /* SMIME reader: handle multipart/signed and opaque signing.
 273  * in multipart case the content is placed in a memory BIO
 274  * pointed to by "bcont". In opaque this is set to NULL
 275  */
 276
 277 PKCS7 *SMIME_read_PKCS7(BIO *bio, BIO **bcont)
 278 {
 279         BIO *p7in;
 280         STACK_OF(MIME_HEADER) *headers = NULL;
 281         STACK_OF(BIO) *parts = NULL;
 282         MIME_HEADER *hdr;
 283         MIME_PARAM *prm;
 284         PKCS7 *p7;
 285         int ret;
 286
 287         if(bcont) *bcont = NULL;
 288
 289         if (!(headers = mime_parse_hdr(bio))) {
 290                 PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_PARSE_ERROR);
 291                 return NULL;
 292         }
 293
 294         if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
 295                 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 296                 PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_CONTENT_TYPE);
 297                 return NULL;
 298         }
 299
 300         /* Handle multipart/signed */
 301
 302         if(!strcmp(hdr->value, "multipart/signed")) {
 303                 /* Split into two parts */
 304                 prm = mime_param_find(hdr, "boundary");
 305                 if(!prm || !prm->param_value) {
 306                         sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 307                         PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BOUNDARY);
 308                         return NULL;
 309                 }
 310                 ret = multi_split(bio, prm->param_value, &parts);
 311                 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 312                 if(!ret || (sk_BIO_num(parts) != 2) ) {
 313                         PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BODY_FAILURE);
 314                         sk_BIO_pop_free(parts, BIO_vfree);
 315                         return NULL;
 316                 }
 317
 318                 /* Parse the signature piece */
 319                 p7in = sk_BIO_value(parts, 1);
 320
 321                 if (!(headers = mime_parse_hdr(p7in))) {
 322                         PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_SIG_PARSE_ERROR);
 323                         sk_BIO_pop_free(parts, BIO_vfree);
 324                         return NULL;
 325                 }
 326
 327                 /* Get content type */
 328
 329                 if(!(hdr = mime_hdr_find(headers, "content-type")) ||
 330                                                                  !hdr->value) {
 331                         sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 332                         PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_SIG_CONTENT_TYPE);
 333                         return NULL;
 334                 }
 335
 336                 if(strcmp(hdr->value, "application/x-pkcs7-signature") &&
 337                         strcmp(hdr->value, "application/pkcs7-signature")) {
 338                         sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 339                         PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_SIG_INVALID_MIME_TYPE);
 340                         ERR_add_error_data(2, "type: ", hdr->value);
 341                         sk_BIO_pop_free(parts, BIO_vfree);
 342                         return NULL;
 343                 }
 344                 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 345                 /* Read in PKCS#7 */
 346                 if(!(p7 = B64_read_PKCS7(p7in))) {
 347                         PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_PKCS7_SIG_PARSE_ERROR);
 348                         sk_BIO_pop_free(parts, BIO_vfree);
 349                         return NULL;
 350                 }
 351
 352                 if(bcont) {
 353                         *bcont = sk_BIO_value(parts, 0);
 354                         BIO_free(p7in);
 355                         sk_BIO_free(parts);
 356                 } else sk_BIO_pop_free(parts, BIO_vfree);
 357                 return p7;
 358         }
 359
 360         /* OK, if not multipart/signed try opaque signature */
 361
 362         if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
 363             strcmp (hdr->value, "application/pkcs7-mime")) {
 364                 PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_INVALID_MIME_TYPE);
 365                 ERR_add_error_data(2, "type: ", hdr->value);
 366                 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 367                 return NULL;
 368         }
 369
 370         sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
 371
 372         if(!(p7 = B64_read_PKCS7(bio))) {
 373                 PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_PKCS7_PARSE_ERROR);
 374                 return NULL;
 375         }
 376         return p7;
 377
 378 }
 379
 380 /* Split a multipart/XXX message body into component parts: result is
 381  * canonical parts in a STACK of bios
 382  */
 383
 384 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
 385 {
 386         char linebuf[MAX_SMLEN];
 387         int len, blen;
 388         int eol = 0, next_eol = 0;
 389         BIO *bpart = NULL;
 390         STACK_OF(BIO) *parts;
 391         char state, part, first;
 392
 393         blen = strlen(bound);
 394         part = 0;
 395         state = 0;
 396         first = 1;
 397         parts = sk_BIO_new_null();
 398         *ret = parts;
 399         while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
 400                 state = mime_bound_check(linebuf, len, bound, blen);
 401                 if(state == 1) {
 402                         first = 1;
 403                         part++;
 404                 } else if(state == 2) {
 405                         sk_BIO_push(parts, bpart);
 406                         return 1;
 407                 } else if(part) {
 408                         /* Strip CR+LF from linebuf */
 409                         next_eol = strip_eol(linebuf, &len);
 410                         if(first) {
 411                                 first = 0;
 412                                 if(bpart) sk_BIO_push(parts, bpart);
 413                                 bpart = BIO_new(BIO_s_mem());
 414                                 BIO_set_mem_eof_return(bpart, 0);
 415                         } else if (eol)
 416                                 BIO_write(bpart, "\r\n", 2);
 417                         eol = next_eol;
 418                         if (len)
 419                                 BIO_write(bpart, linebuf, len);
 420                 }
 421         }
 422         return 0;
 423 }
 424
 425 /* This is the big one: parse MIME header lines up to message body */
 426
 427 #define MIME_INVALID    0
 428 #define MIME_START      1
 429 #define MIME_TYPE       2
 430 #define MIME_NAME       3
 431 #define MIME_VALUE      4
 432 #define MIME_QUOTE      5
 433 #define MIME_COMMENT    6
 434
 435
 436 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
 437 {
 438         char *p, *q, c;
 439         char *ntmp;
 440         char linebuf[MAX_SMLEN];
 441         MIME_HEADER *mhdr = NULL;
 442         STACK_OF(MIME_HEADER) *headers;
 443         int len, state, save_state = 0;
 444
 445         headers = sk_MIME_HEADER_new(mime_hdr_cmp);
 446         while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
 447         /* If whitespace at line start then continuation line */
 448         if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME;
 449         else state = MIME_START;
 450         ntmp = NULL;
 451         /* Go through all characters */
 452         for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
 453
 454         /* State machine to handle MIME headers
 455          * if this looks horrible that's because it *is*
 456          */
 457
 458                 switch(state) {
 459                         case MIME_START:
 460                         if(c == ':') {
 461                                 state = MIME_TYPE;
 462                                 *p = 0;
 463                                 ntmp = strip_ends(q);
 464                                 q = p + 1;
 465                         }
 466                         break;
 467
 468                         case MIME_TYPE:
 469                         if(c == ';') {
 470                                 mime_debug("Found End Value\n");
 471                                 *p = 0;
 472                                 mhdr = mime_hdr_new(ntmp, strip_ends(q));
 473                                 sk_MIME_HEADER_push(headers, mhdr);
 474                                 ntmp = NULL;
 475                                 q = p + 1;
 476                                 state = MIME_NAME;
 477                         } else if(c == '(') {
 478                                 save_state = state;
 479                                 state = MIME_COMMENT;
 480                         }
 481                         break;
 482
 483                         case MIME_COMMENT:
 484                         if(c == ')') {
 485                                 state = save_state;
 486                         }
 487                         break;
 488
 489                         case MIME_NAME:
 490                         if(c == '=') {
 491                                 state = MIME_VALUE;
 492                                 *p = 0;
 493                                 ntmp = strip_ends(q);
 494                                 q = p + 1;
 495                         }
 496                         break ;
 497
 498                         case MIME_VALUE:
 499                         if(c == ';') {
 500                                 state = MIME_NAME;
 501                                 *p = 0;
 502                                 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
 503                                 ntmp = NULL;
 504                                 q = p + 1;
 505                         } else if (c == '"') {
 506                                 mime_debug("Found Quote\n");
 507                                 state = MIME_QUOTE;
 508                         } else if(c == '(') {
 509                                 save_state = state;
 510                                 state = MIME_COMMENT;
 511                         }
 512                         break;
 513
 514                         case MIME_QUOTE:
 515                         if(c == '"') {
 516                                 mime_debug("Found Match Quote\n");
 517                                 state = MIME_VALUE;
 518                         }
 519                         break;
 520                 }
 521         }
 522
 523         if(state == MIME_TYPE) {
 524                 mhdr = mime_hdr_new(ntmp, strip_ends(q));
 525                 sk_MIME_HEADER_push(headers, mhdr);
 526         } else if(state == MIME_VALUE)
 527                          mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
 528         if(p == linebuf) break; /* Blank line means end of headers */
 529 }
 530
 531 return headers;
 532
 533 }
 534
 535 static char *strip_ends(char *name)
 536 {
 537         return strip_end(strip_start(name));
 538 }
 539
 540 /* Strip a parameter of whitespace from start of param */
 541 static char *strip_start(char *name)
 542 {
 543         char *p, c;
 544         /* Look for first non white space or quote */
 545         for(p = name; (c = *p) ;p++) {
 546                 if(c == '"') {
 547                         /* Next char is start of string if non null */
 548                         if(p[1]) return p + 1;
 549                         /* Else null string */
 550                         return NULL;
 551                 }
 552                 if(!isspace((unsigned char)c)) return p;
 553         }
 554         return NULL;
 555 }
 556
 557 /* As above but strip from end of string : maybe should handle brackets? */
 558 static char *strip_end(char *name)
 559 {
 560         char *p, c;
 561         if(!name) return NULL;
 562         /* Look for first non white space or quote */
 563         for(p = name + strlen(name) - 1; p >= name ;p--) {
 564                 c = *p;
 565                 if(c == '"') {
 566                         if(p - 1 == name) return NULL;
 567                         *p = 0;
 568                         return name;
 569                 }
 570                 if(isspace((unsigned char)c)) *p = 0;
 571                 else return name;
 572         }
 573         return NULL;
 574 }
 575
 576 static MIME_HEADER *mime_hdr_new(char *name, char *value)
 577 {
 578         MIME_HEADER *mhdr;
 579         char *tmpname, *tmpval, *p;
 580         int c;
 581         if(name) {
 582                 if(!(tmpname = BUF_strdup(name))) return NULL;
 583                 for(p = tmpname ; *p; p++) {
 584                         c = *p;
 585                         if(isupper(c)) {
 586                                 c = tolower(c);
 587                                 *p = c;
 588                         }
 589                 }
 590         } else tmpname = NULL;
 591         if(value) {
 592                 if(!(tmpval = BUF_strdup(value))) return NULL;
 593                 for(p = tmpval ; *p; p++) {
 594                         c = *p;
 595                         if(isupper(c)) {
 596                                 c = tolower(c);
 597                                 *p = c;
 598                         }
 599                 }
 600         } else tmpval = NULL;
 601         mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER));
 602         if(!mhdr) return NULL;
 603         mhdr->name = tmpname;
 604         mhdr->value = tmpval;
 605         if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL;
 606         return mhdr;
 607 }
 608
 609 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
 610 {
 611         char *tmpname, *tmpval, *p;
 612         int c;
 613         MIME_PARAM *mparam;
 614         if(name) {
 615                 tmpname = BUF_strdup(name);
 616                 if(!tmpname) return 0;
 617                 for(p = tmpname ; *p; p++) {
 618                         c = *p;
 619                         if(isupper(c)) {
 620                                 c = tolower(c);
 621                                 *p = c;
 622                         }
 623                 }
 624         } else tmpname = NULL;
 625         if(value) {
 626                 tmpval = BUF_strdup(value);
 627                 if(!tmpval) return 0;
 628         } else tmpval = NULL;
 629         /* Parameter values are case sensitive so leave as is */
 630         mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM));
 631         if(!mparam) return 0;
 632         mparam->param_name = tmpname;
 633         mparam->param_value = tmpval;
 634         sk_MIME_PARAM_push(mhdr->params, mparam);
 635         return 1;
 636 }
 637
 638 static int mime_hdr_cmp(const MIME_HEADER * const *a,
 639                         const MIME_HEADER * const *b)
 640 {
 641         return(strcmp((*a)->name, (*b)->name));
 642 }
 643
 644 static int mime_param_cmp(const MIME_PARAM * const *a,
 645                         const MIME_PARAM * const *b)
 646 {
 647         return(strcmp((*a)->param_name, (*b)->param_name));
 648 }
 649
 650 /* Find a header with a given name (if possible) */
 651
 652 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
 653 {
 654         MIME_HEADER htmp;
 655         int idx;
 656         htmp.name = name;
 657         idx = sk_MIME_HEADER_find(hdrs, &htmp);
 658         if(idx < 0) return NULL;
 659         return sk_MIME_HEADER_value(hdrs, idx);
 660 }
 661
 662 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
 663 {
 664         MIME_PARAM param;
 665         int idx;
 666         param.param_name = name;
 667         idx = sk_MIME_PARAM_find(hdr->params, &param);
 668         if(idx < 0) return NULL;
 669         return sk_MIME_PARAM_value(hdr->params, idx);
 670 }
 671
 672 static void mime_hdr_free(MIME_HEADER *hdr)
 673 {
 674         if(hdr->name) OPENSSL_free(hdr->name);
 675         if(hdr->value) OPENSSL_free(hdr->value);
 676         if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
 677         OPENSSL_free(hdr);
 678 }
 679
 680 static void mime_param_free(MIME_PARAM *param)
 681 {
 682         if(param->param_name) OPENSSL_free(param->param_name);
 683         if(param->param_value) OPENSSL_free(param->param_value);
 684         OPENSSL_free(param);
 685 }
 686
 687 /* Check for a multipart boundary. Returns:
 688  * 0 : no boundary
 689  * 1 : part boundary
 690  * 2 : final boundary
 691  */
 692 static int mime_bound_check(char *line, int linelen, char *bound, int blen)
 693 {
 694         if(linelen == -1) linelen = strlen(line);
 695         if(blen == -1) blen = strlen(bound);
 696         /* Quickly eliminate if line length too short */
 697         if(blen + 2 > linelen) return 0;
 698         /* Check for part boundary */
 699         if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
 700                 if(!strncmp(line + blen + 2, "--", 2)) return 2;
 701                 else return 1;
 702         }
 703         return 0;
 704 }
 705
 706 static int strip_eol(char *linebuf, int *plen)
 707         {
 708         int len = *plen;
 709         char *p, c;
 710         int is_eol = 0;
 711         p = linebuf + len - 1;
 712         for (p = linebuf + len - 1; len > 0; len--, p--)
 713                 {
 714                 c = *p;
 715                 if (c == '\n')
 716                         is_eol = 1;
 717                 else if (c != '\r')
 718                         break;
 719                 }
 720         *plen = len;
 721         return is_eol;
 722         }