asn_mime.c revision bdfb8ad83da0647e9b9a32792598e8ce7ba3ef4d
1/* asn_mime.c */ 2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1999-2008 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 */ 54 55#include <stdio.h> 56#include <ctype.h> 57#include "cryptlib.h" 58#include <openssl/rand.h> 59#include <openssl/x509.h> 60#include <openssl/asn1.h> 61#include <openssl/asn1t.h> 62 63/* Generalised MIME like utilities for streaming ASN1. Although many 64 * have a PKCS7/CMS like flavour others are more general purpose. 65 */ 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 char * strip_ends(char *name); 90static char * strip_start(char *name); 91static char * strip_end(char *name); 92static MIME_HEADER *mime_hdr_new(char *name, char *value); 93static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); 94static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); 95static int mime_hdr_cmp(const MIME_HEADER * const *a, 96 const MIME_HEADER * const *b); 97static int mime_param_cmp(const MIME_PARAM * const *a, 98 const MIME_PARAM * const *b); 99static void mime_param_free(MIME_PARAM *param); 100static int mime_bound_check(char *line, int linelen, char *bound, int blen); 101static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); 102static int strip_eol(char *linebuf, int *plen); 103static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); 104static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); 105static void mime_hdr_free(MIME_HEADER *hdr); 106 107#define MAX_SMLEN 1024 108#define mime_debug(x) /* x */ 109 110/* Base 64 read and write of ASN1 structure */ 111 112static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, 113 const ASN1_ITEM *it) 114 { 115 BIO *b64; 116 int r; 117 b64 = BIO_new(BIO_f_base64()); 118 if(!b64) 119 { 120 ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE); 121 return 0; 122 } 123 /* prepend the b64 BIO so all data is base64 encoded. 124 */ 125 out = BIO_push(b64, out); 126 r = ASN1_item_i2d_bio(it, out, val); 127 (void)BIO_flush(out); 128 BIO_pop(out); 129 BIO_free(b64); 130 return r; 131 } 132 133static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) 134{ 135 BIO *b64; 136 ASN1_VALUE *val; 137 if(!(b64 = BIO_new(BIO_f_base64()))) { 138 ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE); 139 return 0; 140 } 141 bio = BIO_push(b64, bio); 142 val = ASN1_item_d2i_bio(it, bio, NULL); 143 if(!val) 144 ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR); 145 (void)BIO_flush(bio); 146 bio = BIO_pop(bio); 147 BIO_free(b64); 148 return val; 149} 150 151/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ 152 153static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) 154 { 155 const EVP_MD *md; 156 int i, have_unknown = 0, write_comma, md_nid; 157 have_unknown = 0; 158 write_comma = 0; 159 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) 160 { 161 if (write_comma) 162 BIO_write(out, ",", 1); 163 write_comma = 1; 164 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); 165 md = EVP_get_digestbynid(md_nid); 166 switch(md_nid) 167 { 168 case NID_sha1: 169 BIO_puts(out, "sha1"); 170 break; 171 172 case NID_md5: 173 BIO_puts(out, "md5"); 174 break; 175 176 case NID_sha256: 177 BIO_puts(out, "sha-256"); 178 break; 179 180 case NID_sha384: 181 BIO_puts(out, "sha-384"); 182 break; 183 184 case NID_sha512: 185 BIO_puts(out, "sha-512"); 186 break; 187 188 default: 189 if (have_unknown) 190 write_comma = 0; 191 else 192 { 193 BIO_puts(out, "unknown"); 194 have_unknown = 1; 195 } 196 break; 197 198 } 199 } 200 201 return 1; 202 203 } 204 205/* SMIME sender */ 206 207int int_smime_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, 208 int ctype_nid, int econt_nid, 209 STACK_OF(X509_ALGOR) *mdalgs, 210 asn1_output_data_fn *data_fn, 211 const ASN1_ITEM *it) 212{ 213 char bound[33], c; 214 int i; 215 const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; 216 const char *msg_type=NULL; 217 if (flags & SMIME_OLDMIME) 218 mime_prefix = "application/x-pkcs7-"; 219 else 220 mime_prefix = "application/pkcs7-"; 221 222 if (flags & SMIME_CRLFEOL) 223 mime_eol = "\r\n"; 224 else 225 mime_eol = "\n"; 226 if((flags & SMIME_DETACHED) && data) { 227 /* We want multipart/signed */ 228 /* Generate a random boundary */ 229 RAND_pseudo_bytes((unsigned char *)bound, 32); 230 for(i = 0; i < 32; i++) { 231 c = bound[i] & 0xf; 232 if(c < 10) c += '0'; 233 else c += 'A' - 10; 234 bound[i] = c; 235 } 236 bound[32] = 0; 237 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 238 BIO_printf(bio, "Content-Type: multipart/signed;"); 239 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); 240 BIO_puts(bio, " micalg=\""); 241 asn1_write_micalg(bio, mdalgs); 242 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", 243 bound, mime_eol, mime_eol); 244 BIO_printf(bio, "This is an S/MIME signed message%s%s", 245 mime_eol, mime_eol); 246 /* Now write out the first part */ 247 BIO_printf(bio, "------%s%s", bound, mime_eol); 248 if (!data_fn(bio, data, val, flags, it)) 249 return 0; 250 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); 251 252 /* Headers for signature */ 253 254 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); 255 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); 256 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", 257 mime_eol); 258 BIO_printf(bio, "Content-Disposition: attachment;"); 259 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", 260 mime_eol, mime_eol); 261 B64_write_ASN1(bio, val, NULL, 0, it); 262 BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound, 263 mime_eol, mime_eol); 264 return 1; 265 } 266 267 /* Determine smime-type header */ 268 269 if (ctype_nid == NID_pkcs7_enveloped) 270 msg_type = "enveloped-data"; 271 else if (ctype_nid == NID_pkcs7_signed) 272 { 273 if (econt_nid == NID_id_smime_ct_receipt) 274 msg_type = "signed-receipt"; 275 else if (sk_X509_ALGOR_num(mdalgs) >= 0) 276 msg_type = "signed-data"; 277 else 278 msg_type = "certs-only"; 279 } 280 else if (ctype_nid == NID_id_smime_ct_compressedData) 281 { 282 msg_type = "compressed-data"; 283 cname = "smime.p7z"; 284 } 285 /* MIME headers */ 286 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 287 BIO_printf(bio, "Content-Disposition: attachment;"); 288 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); 289 BIO_printf(bio, "Content-Type: %smime;", mime_prefix); 290 if (msg_type) 291 BIO_printf(bio, " smime-type=%s;", msg_type); 292 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); 293 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", 294 mime_eol, mime_eol); 295 if (!B64_write_ASN1(bio, val, data, flags, it)) 296 return 0; 297 BIO_printf(bio, "%s", mime_eol); 298 return 1; 299} 300 301#if 0 302 303/* Handle output of ASN1 data */ 304 305 306static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, 307 const ASN1_ITEM *it) 308 { 309 BIO *tmpbio; 310 const ASN1_AUX *aux = it->funcs; 311 ASN1_STREAM_ARG sarg; 312 313 if (!(flags & SMIME_DETACHED)) 314 { 315 SMIME_crlf_copy(data, out, flags); 316 return 1; 317 } 318 319 if (!aux || !aux->asn1_cb) 320 { 321 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, 322 ASN1_R_STREAMING_NOT_SUPPORTED); 323 return 0; 324 } 325 326 sarg.out = out; 327 sarg.ndef_bio = NULL; 328 sarg.boundary = NULL; 329 330 /* Let ASN1 code prepend any needed BIOs */ 331 332 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) 333 return 0; 334 335 /* Copy data across, passing through filter BIOs for processing */ 336 SMIME_crlf_copy(data, sarg.ndef_bio, flags); 337 338 /* Finalize structure */ 339 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) 340 return 0; 341 342 /* Now remove any digests prepended to the BIO */ 343 344 while (sarg.ndef_bio != out) 345 { 346 tmpbio = BIO_pop(sarg.ndef_bio); 347 BIO_free(sarg.ndef_bio); 348 sarg.ndef_bio = tmpbio; 349 } 350 351 return 1; 352 353 } 354 355#endif 356 357/* SMIME reader: handle multipart/signed and opaque signing. 358 * in multipart case the content is placed in a memory BIO 359 * pointed to by "bcont". In opaque this is set to NULL 360 */ 361 362ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) 363{ 364 BIO *asnin; 365 STACK_OF(MIME_HEADER) *headers = NULL; 366 STACK_OF(BIO) *parts = NULL; 367 MIME_HEADER *hdr; 368 MIME_PARAM *prm; 369 ASN1_VALUE *val; 370 int ret; 371 372 if(bcont) *bcont = NULL; 373 374 if (!(headers = mime_parse_hdr(bio))) { 375 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR); 376 return NULL; 377 } 378 379 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 380 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 381 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); 382 return NULL; 383 } 384 385 /* Handle multipart/signed */ 386 387 if(!strcmp(hdr->value, "multipart/signed")) { 388 /* Split into two parts */ 389 prm = mime_param_find(hdr, "boundary"); 390 if(!prm || !prm->param_value) { 391 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 392 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); 393 return NULL; 394 } 395 ret = multi_split(bio, prm->param_value, &parts); 396 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 397 if(!ret || (sk_BIO_num(parts) != 2) ) { 398 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); 399 sk_BIO_pop_free(parts, BIO_vfree); 400 return NULL; 401 } 402 403 /* Parse the signature piece */ 404 asnin = sk_BIO_value(parts, 1); 405 406 if (!(headers = mime_parse_hdr(asnin))) { 407 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR); 408 sk_BIO_pop_free(parts, BIO_vfree); 409 return NULL; 410 } 411 412 /* Get content type */ 413 414 if(!(hdr = mime_hdr_find(headers, "content-type")) || 415 !hdr->value) { 416 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 417 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); 418 return NULL; 419 } 420 421 if(strcmp(hdr->value, "application/x-pkcs7-signature") && 422 strcmp(hdr->value, "application/pkcs7-signature")) { 423 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 424 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE); 425 ERR_add_error_data(2, "type: ", hdr->value); 426 sk_BIO_pop_free(parts, BIO_vfree); 427 return NULL; 428 } 429 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 430 /* Read in ASN1 */ 431 if(!(val = b64_read_asn1(asnin, it))) { 432 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR); 433 sk_BIO_pop_free(parts, BIO_vfree); 434 return NULL; 435 } 436 437 if(bcont) { 438 *bcont = sk_BIO_value(parts, 0); 439 BIO_free(asnin); 440 sk_BIO_free(parts); 441 } else sk_BIO_pop_free(parts, BIO_vfree); 442 return val; 443 } 444 445 /* OK, if not multipart/signed try opaque signature */ 446 447 if (strcmp (hdr->value, "application/x-pkcs7-mime") && 448 strcmp (hdr->value, "application/pkcs7-mime")) { 449 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE); 450 ERR_add_error_data(2, "type: ", hdr->value); 451 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 452 return NULL; 453 } 454 455 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 456 457 if(!(val = b64_read_asn1(bio, it))) { 458 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); 459 return NULL; 460 } 461 return val; 462 463} 464 465/* Copy text from one BIO to another making the output CRLF at EOL */ 466int SMIME_crlf_copy(BIO *in, BIO *out, int flags) 467{ 468 BIO *bf; 469 char eol; 470 int len; 471 char linebuf[MAX_SMLEN]; 472 /* Buffer output so we don't write one line at a time. This is 473 * useful when streaming as we don't end up with one OCTET STRING 474 * per line. 475 */ 476 bf = BIO_new(BIO_f_buffer()); 477 if (!bf) 478 return 0; 479 out = BIO_push(bf, out); 480 if(flags & SMIME_BINARY) 481 { 482 while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) 483 BIO_write(out, linebuf, len); 484 } 485 else 486 { 487 if(flags & SMIME_TEXT) 488 BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); 489 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) 490 { 491 eol = strip_eol(linebuf, &len); 492 if (len) 493 BIO_write(out, linebuf, len); 494 if(eol) BIO_write(out, "\r\n", 2); 495 } 496 } 497 (void)BIO_flush(out); 498 BIO_pop(out); 499 BIO_free(bf); 500 return 1; 501} 502 503/* Strip off headers if they are text/plain */ 504int SMIME_text(BIO *in, BIO *out) 505{ 506 char iobuf[4096]; 507 int len; 508 STACK_OF(MIME_HEADER) *headers; 509 MIME_HEADER *hdr; 510 511 if (!(headers = mime_parse_hdr(in))) { 512 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR); 513 return 0; 514 } 515 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 516 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE); 517 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 518 return 0; 519 } 520 if (strcmp (hdr->value, "text/plain")) { 521 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE); 522 ERR_add_error_data(2, "type: ", hdr->value); 523 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 524 return 0; 525 } 526 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 527 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) 528 BIO_write(out, iobuf, len); 529 return 1; 530} 531 532/* Split a multipart/XXX message body into component parts: result is 533 * canonical parts in a STACK of bios 534 */ 535 536static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) 537{ 538 char linebuf[MAX_SMLEN]; 539 int len, blen; 540 int eol = 0, next_eol = 0; 541 BIO *bpart = NULL; 542 STACK_OF(BIO) *parts; 543 char state, part, first; 544 545 blen = strlen(bound); 546 part = 0; 547 state = 0; 548 first = 1; 549 parts = sk_BIO_new_null(); 550 *ret = parts; 551 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 552 state = mime_bound_check(linebuf, len, bound, blen); 553 if(state == 1) { 554 first = 1; 555 part++; 556 } else if(state == 2) { 557 sk_BIO_push(parts, bpart); 558 return 1; 559 } else if(part) { 560 /* Strip CR+LF from linebuf */ 561 next_eol = strip_eol(linebuf, &len); 562 if(first) { 563 first = 0; 564 if(bpart) sk_BIO_push(parts, bpart); 565 bpart = BIO_new(BIO_s_mem()); 566 BIO_set_mem_eof_return(bpart, 0); 567 } else if (eol) 568 BIO_write(bpart, "\r\n", 2); 569 eol = next_eol; 570 if (len) 571 BIO_write(bpart, linebuf, len); 572 } 573 } 574 return 0; 575} 576 577/* This is the big one: parse MIME header lines up to message body */ 578 579#define MIME_INVALID 0 580#define MIME_START 1 581#define MIME_TYPE 2 582#define MIME_NAME 3 583#define MIME_VALUE 4 584#define MIME_QUOTE 5 585#define MIME_COMMENT 6 586 587 588static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) 589{ 590 char *p, *q, c; 591 char *ntmp; 592 char linebuf[MAX_SMLEN]; 593 MIME_HEADER *mhdr = NULL; 594 STACK_OF(MIME_HEADER) *headers; 595 int len, state, save_state = 0; 596 597 headers = sk_MIME_HEADER_new(mime_hdr_cmp); 598 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 599 /* If whitespace at line start then continuation line */ 600 if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; 601 else state = MIME_START; 602 ntmp = NULL; 603 /* Go through all characters */ 604 for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { 605 606 /* State machine to handle MIME headers 607 * if this looks horrible that's because it *is* 608 */ 609 610 switch(state) { 611 case MIME_START: 612 if(c == ':') { 613 state = MIME_TYPE; 614 *p = 0; 615 ntmp = strip_ends(q); 616 q = p + 1; 617 } 618 break; 619 620 case MIME_TYPE: 621 if(c == ';') { 622 mime_debug("Found End Value\n"); 623 *p = 0; 624 mhdr = mime_hdr_new(ntmp, strip_ends(q)); 625 sk_MIME_HEADER_push(headers, mhdr); 626 ntmp = NULL; 627 q = p + 1; 628 state = MIME_NAME; 629 } else if(c == '(') { 630 save_state = state; 631 state = MIME_COMMENT; 632 } 633 break; 634 635 case MIME_COMMENT: 636 if(c == ')') { 637 state = save_state; 638 } 639 break; 640 641 case MIME_NAME: 642 if(c == '=') { 643 state = MIME_VALUE; 644 *p = 0; 645 ntmp = strip_ends(q); 646 q = p + 1; 647 } 648 break ; 649 650 case MIME_VALUE: 651 if(c == ';') { 652 state = MIME_NAME; 653 *p = 0; 654 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 655 ntmp = NULL; 656 q = p + 1; 657 } else if (c == '"') { 658 mime_debug("Found Quote\n"); 659 state = MIME_QUOTE; 660 } else if(c == '(') { 661 save_state = state; 662 state = MIME_COMMENT; 663 } 664 break; 665 666 case MIME_QUOTE: 667 if(c == '"') { 668 mime_debug("Found Match Quote\n"); 669 state = MIME_VALUE; 670 } 671 break; 672 } 673 } 674 675 if(state == MIME_TYPE) { 676 mhdr = mime_hdr_new(ntmp, strip_ends(q)); 677 sk_MIME_HEADER_push(headers, mhdr); 678 } else if(state == MIME_VALUE) 679 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 680 if(p == linebuf) break; /* Blank line means end of headers */ 681} 682 683return headers; 684 685} 686 687static char *strip_ends(char *name) 688{ 689 return strip_end(strip_start(name)); 690} 691 692/* Strip a parameter of whitespace from start of param */ 693static char *strip_start(char *name) 694{ 695 char *p, c; 696 /* Look for first non white space or quote */ 697 for(p = name; (c = *p) ;p++) { 698 if(c == '"') { 699 /* Next char is start of string if non null */ 700 if(p[1]) return p + 1; 701 /* Else null string */ 702 return NULL; 703 } 704 if(!isspace((unsigned char)c)) return p; 705 } 706 return NULL; 707} 708 709/* As above but strip from end of string : maybe should handle brackets? */ 710static char *strip_end(char *name) 711{ 712 char *p, c; 713 if(!name) return NULL; 714 /* Look for first non white space or quote */ 715 for(p = name + strlen(name) - 1; p >= name ;p--) { 716 c = *p; 717 if(c == '"') { 718 if(p - 1 == name) return NULL; 719 *p = 0; 720 return name; 721 } 722 if(isspace((unsigned char)c)) *p = 0; 723 else return name; 724 } 725 return NULL; 726} 727 728static MIME_HEADER *mime_hdr_new(char *name, char *value) 729{ 730 MIME_HEADER *mhdr; 731 char *tmpname, *tmpval, *p; 732 int c; 733 if(name) { 734 if(!(tmpname = BUF_strdup(name))) return NULL; 735 for(p = tmpname ; *p; p++) { 736 c = *p; 737 if(isupper(c)) { 738 c = tolower(c); 739 *p = c; 740 } 741 } 742 } else tmpname = NULL; 743 if(value) { 744 if(!(tmpval = BUF_strdup(value))) return NULL; 745 for(p = tmpval ; *p; p++) { 746 c = *p; 747 if(isupper(c)) { 748 c = tolower(c); 749 *p = c; 750 } 751 } 752 } else tmpval = NULL; 753 mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); 754 if(!mhdr) return NULL; 755 mhdr->name = tmpname; 756 mhdr->value = tmpval; 757 if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; 758 return mhdr; 759} 760 761static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) 762{ 763 char *tmpname, *tmpval, *p; 764 int c; 765 MIME_PARAM *mparam; 766 if(name) { 767 tmpname = BUF_strdup(name); 768 if(!tmpname) return 0; 769 for(p = tmpname ; *p; p++) { 770 c = *p; 771 if(isupper(c)) { 772 c = tolower(c); 773 *p = c; 774 } 775 } 776 } else tmpname = NULL; 777 if(value) { 778 tmpval = BUF_strdup(value); 779 if(!tmpval) return 0; 780 } else tmpval = NULL; 781 /* Parameter values are case sensitive so leave as is */ 782 mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); 783 if(!mparam) return 0; 784 mparam->param_name = tmpname; 785 mparam->param_value = tmpval; 786 sk_MIME_PARAM_push(mhdr->params, mparam); 787 return 1; 788} 789 790static int mime_hdr_cmp(const MIME_HEADER * const *a, 791 const MIME_HEADER * const *b) 792{ 793 return(strcmp((*a)->name, (*b)->name)); 794} 795 796static int mime_param_cmp(const MIME_PARAM * const *a, 797 const MIME_PARAM * const *b) 798{ 799 return(strcmp((*a)->param_name, (*b)->param_name)); 800} 801 802/* Find a header with a given name (if possible) */ 803 804static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) 805{ 806 MIME_HEADER htmp; 807 int idx; 808 htmp.name = name; 809 idx = sk_MIME_HEADER_find(hdrs, &htmp); 810 if(idx < 0) return NULL; 811 return sk_MIME_HEADER_value(hdrs, idx); 812} 813 814static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) 815{ 816 MIME_PARAM param; 817 int idx; 818 param.param_name = name; 819 idx = sk_MIME_PARAM_find(hdr->params, ¶m); 820 if(idx < 0) return NULL; 821 return sk_MIME_PARAM_value(hdr->params, idx); 822} 823 824static void mime_hdr_free(MIME_HEADER *hdr) 825{ 826 if(hdr->name) OPENSSL_free(hdr->name); 827 if(hdr->value) OPENSSL_free(hdr->value); 828 if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); 829 OPENSSL_free(hdr); 830} 831 832static void mime_param_free(MIME_PARAM *param) 833{ 834 if(param->param_name) OPENSSL_free(param->param_name); 835 if(param->param_value) OPENSSL_free(param->param_value); 836 OPENSSL_free(param); 837} 838 839/* Check for a multipart boundary. Returns: 840 * 0 : no boundary 841 * 1 : part boundary 842 * 2 : final boundary 843 */ 844static int mime_bound_check(char *line, int linelen, char *bound, int blen) 845{ 846 if(linelen == -1) linelen = strlen(line); 847 if(blen == -1) blen = strlen(bound); 848 /* Quickly eliminate if line length too short */ 849 if(blen + 2 > linelen) return 0; 850 /* Check for part boundary */ 851 if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { 852 if(!strncmp(line + blen + 2, "--", 2)) return 2; 853 else return 1; 854 } 855 return 0; 856} 857 858static int strip_eol(char *linebuf, int *plen) 859 { 860 int len = *plen; 861 char *p, c; 862 int is_eol = 0; 863 p = linebuf + len - 1; 864 for (p = linebuf + len - 1; len > 0; len--, p--) 865 { 866 c = *p; 867 if (c == '\n') 868 is_eol = 1; 869 else if (c != '\r') 870 break; 871 } 872 *plen = len; 873 return is_eol; 874 } 875