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 72typedef struct { 73char *param_name; /* Param name e.g. "micalg" */ 74char *param_value; /* Param value e.g. "sha1" */ 75} MIME_PARAM; 76 77DECLARE_STACK_OF(MIME_PARAM) 78IMPLEMENT_STACK_OF(MIME_PARAM) 79 80typedef struct { 81char *name; /* Name of line e.g. "content-type" */ 82char *value; /* Value of line e.g. "text/plain" */ 83STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ 84} MIME_HEADER; 85 86DECLARE_STACK_OF(MIME_HEADER) 87IMPLEMENT_STACK_OF(MIME_HEADER) 88 89static int pkcs7_output_data(BIO *bio, BIO *data, PKCS7 *p7, int flags); 90static int B64_write_PKCS7(BIO *bio, PKCS7 *p7); 91static PKCS7 *B64_read_PKCS7(BIO *bio); 92static char * strip_ends(char *name); 93static char * strip_start(char *name); 94static char * strip_end(char *name); 95static MIME_HEADER *mime_hdr_new(char *name, char *value); 96static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); 97static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); 98static int mime_hdr_cmp(const MIME_HEADER * const *a, 99 const MIME_HEADER * const *b); 100static int mime_param_cmp(const MIME_PARAM * const *a, 101 const MIME_PARAM * const *b); 102static void mime_param_free(MIME_PARAM *param); 103static int mime_bound_check(char *line, int linelen, char *bound, int blen); 104static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); 105static int strip_eol(char *linebuf, int *plen); 106static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); 107static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); 108static 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 115static 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 BIO_flush(bio); 125 bio = BIO_pop(bio); 126 BIO_free(b64); 127 return 1; 128} 129 130static 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 BIO_flush(bio); 142 bio = BIO_pop(bio); 143 BIO_free(b64); 144 return p7; 145} 146 147/* SMIME sender */ 148 149int 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 235static 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 277PKCS7 *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/* Copy text from one BIO to another making the output CRLF at EOL */ 381int SMIME_crlf_copy(BIO *in, BIO *out, int flags) 382{ 383 char eol; 384 int len; 385 char linebuf[MAX_SMLEN]; 386 if(flags & PKCS7_BINARY) { 387 while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) 388 BIO_write(out, linebuf, len); 389 return 1; 390 } 391 if(flags & PKCS7_TEXT) 392 BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); 393 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { 394 eol = strip_eol(linebuf, &len); 395 if (len) 396 BIO_write(out, linebuf, len); 397 if(eol) BIO_write(out, "\r\n", 2); 398 } 399 return 1; 400} 401 402/* Strip off headers if they are text/plain */ 403int SMIME_text(BIO *in, BIO *out) 404{ 405 char iobuf[4096]; 406 int len; 407 STACK_OF(MIME_HEADER) *headers; 408 MIME_HEADER *hdr; 409 410 if (!(headers = mime_parse_hdr(in))) { 411 PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_PARSE_ERROR); 412 return 0; 413 } 414 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 415 PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_NO_CONTENT_TYPE); 416 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 417 return 0; 418 } 419 if (strcmp (hdr->value, "text/plain")) { 420 PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_INVALID_MIME_TYPE); 421 ERR_add_error_data(2, "type: ", hdr->value); 422 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 423 return 0; 424 } 425 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 426 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) 427 BIO_write(out, iobuf, len); 428 return 1; 429} 430 431/* Split a multipart/XXX message body into component parts: result is 432 * canonical parts in a STACK of bios 433 */ 434 435static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) 436{ 437 char linebuf[MAX_SMLEN]; 438 int len, blen; 439 int eol = 0, next_eol = 0; 440 BIO *bpart = NULL; 441 STACK_OF(BIO) *parts; 442 char state, part, first; 443 444 blen = strlen(bound); 445 part = 0; 446 state = 0; 447 first = 1; 448 parts = sk_BIO_new_null(); 449 *ret = parts; 450 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 451 state = mime_bound_check(linebuf, len, bound, blen); 452 if(state == 1) { 453 first = 1; 454 part++; 455 } else if(state == 2) { 456 sk_BIO_push(parts, bpart); 457 return 1; 458 } else if(part) { 459 /* Strip CR+LF from linebuf */ 460 next_eol = strip_eol(linebuf, &len); 461 if(first) { 462 first = 0; 463 if(bpart) sk_BIO_push(parts, bpart); 464 bpart = BIO_new(BIO_s_mem()); 465 BIO_set_mem_eof_return(bpart, 0); 466 } else if (eol) 467 BIO_write(bpart, "\r\n", 2); 468 eol = next_eol; 469 if (len) 470 BIO_write(bpart, linebuf, len); 471 } 472 } 473 return 0; 474} 475 476/* This is the big one: parse MIME header lines up to message body */ 477 478#define MIME_INVALID 0 479#define MIME_START 1 480#define MIME_TYPE 2 481#define MIME_NAME 3 482#define MIME_VALUE 4 483#define MIME_QUOTE 5 484#define MIME_COMMENT 6 485 486 487static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) 488{ 489 char *p, *q, c; 490 char *ntmp; 491 char linebuf[MAX_SMLEN]; 492 MIME_HEADER *mhdr = NULL; 493 STACK_OF(MIME_HEADER) *headers; 494 int len, state, save_state = 0; 495 496 headers = sk_MIME_HEADER_new(mime_hdr_cmp); 497 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 498 /* If whitespace at line start then continuation line */ 499 if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; 500 else state = MIME_START; 501 ntmp = NULL; 502 /* Go through all characters */ 503 for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { 504 505 /* State machine to handle MIME headers 506 * if this looks horrible that's because it *is* 507 */ 508 509 switch(state) { 510 case MIME_START: 511 if(c == ':') { 512 state = MIME_TYPE; 513 *p = 0; 514 ntmp = strip_ends(q); 515 q = p + 1; 516 } 517 break; 518 519 case MIME_TYPE: 520 if(c == ';') { 521 mime_debug("Found End Value\n"); 522 *p = 0; 523 mhdr = mime_hdr_new(ntmp, strip_ends(q)); 524 sk_MIME_HEADER_push(headers, mhdr); 525 ntmp = NULL; 526 q = p + 1; 527 state = MIME_NAME; 528 } else if(c == '(') { 529 save_state = state; 530 state = MIME_COMMENT; 531 } 532 break; 533 534 case MIME_COMMENT: 535 if(c == ')') { 536 state = save_state; 537 } 538 break; 539 540 case MIME_NAME: 541 if(c == '=') { 542 state = MIME_VALUE; 543 *p = 0; 544 ntmp = strip_ends(q); 545 q = p + 1; 546 } 547 break ; 548 549 case MIME_VALUE: 550 if(c == ';') { 551 state = MIME_NAME; 552 *p = 0; 553 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 554 ntmp = NULL; 555 q = p + 1; 556 } else if (c == '"') { 557 mime_debug("Found Quote\n"); 558 state = MIME_QUOTE; 559 } else if(c == '(') { 560 save_state = state; 561 state = MIME_COMMENT; 562 } 563 break; 564 565 case MIME_QUOTE: 566 if(c == '"') { 567 mime_debug("Found Match Quote\n"); 568 state = MIME_VALUE; 569 } 570 break; 571 } 572 } 573 574 if(state == MIME_TYPE) { 575 mhdr = mime_hdr_new(ntmp, strip_ends(q)); 576 sk_MIME_HEADER_push(headers, mhdr); 577 } else if(state == MIME_VALUE) 578 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 579 if(p == linebuf) break; /* Blank line means end of headers */ 580} 581 582return headers; 583 584} 585 586static char *strip_ends(char *name) 587{ 588 return strip_end(strip_start(name)); 589} 590 591/* Strip a parameter of whitespace from start of param */ 592static char *strip_start(char *name) 593{ 594 char *p, c; 595 /* Look for first non white space or quote */ 596 for(p = name; (c = *p) ;p++) { 597 if(c == '"') { 598 /* Next char is start of string if non null */ 599 if(p[1]) return p + 1; 600 /* Else null string */ 601 return NULL; 602 } 603 if(!isspace((unsigned char)c)) return p; 604 } 605 return NULL; 606} 607 608/* As above but strip from end of string : maybe should handle brackets? */ 609static char *strip_end(char *name) 610{ 611 char *p, c; 612 if(!name) return NULL; 613 /* Look for first non white space or quote */ 614 for(p = name + strlen(name) - 1; p >= name ;p--) { 615 c = *p; 616 if(c == '"') { 617 if(p - 1 == name) return NULL; 618 *p = 0; 619 return name; 620 } 621 if(isspace((unsigned char)c)) *p = 0; 622 else return name; 623 } 624 return NULL; 625} 626 627static MIME_HEADER *mime_hdr_new(char *name, char *value) 628{ 629 MIME_HEADER *mhdr; 630 char *tmpname, *tmpval, *p; 631 int c; 632 if(name) { 633 if(!(tmpname = BUF_strdup(name))) return NULL; 634 for(p = tmpname ; *p; p++) { 635 c = *p; 636 if(isupper(c)) { 637 c = tolower(c); 638 *p = c; 639 } 640 } 641 } else tmpname = NULL; 642 if(value) { 643 if(!(tmpval = BUF_strdup(value))) return NULL; 644 for(p = tmpval ; *p; p++) { 645 c = *p; 646 if(isupper(c)) { 647 c = tolower(c); 648 *p = c; 649 } 650 } 651 } else tmpval = NULL; 652 mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); 653 if(!mhdr) return NULL; 654 mhdr->name = tmpname; 655 mhdr->value = tmpval; 656 if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; 657 return mhdr; 658} 659 660static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) 661{ 662 char *tmpname, *tmpval, *p; 663 int c; 664 MIME_PARAM *mparam; 665 if(name) { 666 tmpname = BUF_strdup(name); 667 if(!tmpname) return 0; 668 for(p = tmpname ; *p; p++) { 669 c = *p; 670 if(isupper(c)) { 671 c = tolower(c); 672 *p = c; 673 } 674 } 675 } else tmpname = NULL; 676 if(value) { 677 tmpval = BUF_strdup(value); 678 if(!tmpval) return 0; 679 } else tmpval = NULL; 680 /* Parameter values are case sensitive so leave as is */ 681 mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); 682 if(!mparam) return 0; 683 mparam->param_name = tmpname; 684 mparam->param_value = tmpval; 685 sk_MIME_PARAM_push(mhdr->params, mparam); 686 return 1; 687} 688 689static int mime_hdr_cmp(const MIME_HEADER * const *a, 690 const MIME_HEADER * const *b) 691{ 692 return(strcmp((*a)->name, (*b)->name)); 693} 694 695static int mime_param_cmp(const MIME_PARAM * const *a, 696 const MIME_PARAM * const *b) 697{ 698 return(strcmp((*a)->param_name, (*b)->param_name)); 699} 700 701/* Find a header with a given name (if possible) */ 702 703static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) 704{ 705 MIME_HEADER htmp; 706 int idx; 707 htmp.name = name; 708 idx = sk_MIME_HEADER_find(hdrs, &htmp); 709 if(idx < 0) return NULL; 710 return sk_MIME_HEADER_value(hdrs, idx); 711} 712 713static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) 714{ 715 MIME_PARAM param; 716 int idx; 717 param.param_name = name; 718 idx = sk_MIME_PARAM_find(hdr->params, ¶m); 719 if(idx < 0) return NULL; 720 return sk_MIME_PARAM_value(hdr->params, idx); 721} 722 723static void mime_hdr_free(MIME_HEADER *hdr) 724{ 725 if(hdr->name) OPENSSL_free(hdr->name); 726 if(hdr->value) OPENSSL_free(hdr->value); 727 if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); 728 OPENSSL_free(hdr); 729} 730 731static void mime_param_free(MIME_PARAM *param) 732{ 733 if(param->param_name) OPENSSL_free(param->param_name); 734 if(param->param_value) OPENSSL_free(param->param_value); 735 OPENSSL_free(param); 736} 737 738/* Check for a multipart boundary. Returns: 739 * 0 : no boundary 740 * 1 : part boundary 741 * 2 : final boundary 742 */ 743static int mime_bound_check(char *line, int linelen, char *bound, int blen) 744{ 745 if(linelen == -1) linelen = strlen(line); 746 if(blen == -1) blen = strlen(bound); 747 /* Quickly eliminate if line length too short */ 748 if(blen + 2 > linelen) return 0; 749 /* Check for part boundary */ 750 if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { 751 if(!strncmp(line + blen + 2, "--", 2)) return 2; 752 else return 1; 753 } 754 return 0; 755} 756 757static int strip_eol(char *linebuf, int *plen) 758 { 759 int len = *plen; 760 char *p, c; 761 int is_eol = 0; 762 p = linebuf + len - 1; 763 for (p = linebuf + len - 1; len > 0; len--, p--) 764 { 765 c = *p; 766 if (c == '\n') 767 is_eol = 1; 768 else if (c != '\r') 769 break; 770 } 771 *plen = len; 772 return is_eol; 773 } 774