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 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 char * strip_ends(char *name); 90 static char * strip_start(char *name); 91 static char * strip_end(char *name); 92 static MIME_HEADER *mime_hdr_new(char *name, char *value); 93 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); 94 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); 95 static int mime_hdr_cmp(const MIME_HEADER * const *a, 96 const MIME_HEADER * const *b); 97 static int mime_param_cmp(const MIME_PARAM * const *a, 98 const MIME_PARAM * const *b); 99 static void mime_param_free(MIME_PARAM *param); 100 static int mime_bound_check(char *line, int linelen, char *bound, int blen); 101 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); 102 static int strip_eol(char *linebuf, int *plen); 103 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); 104 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); 105 static 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 */ 111 112 static 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 } 132 133 static 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 */ 152 153 static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) 154 { 155 int i, have_unknown = 0, write_comma, md_nid; 156 have_unknown = 0; 157 write_comma = 0; 158 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) 159 { 160 if (write_comma) 161 BIO_write(out, ",", 1); 162 write_comma = 1; 163 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); 164 switch(md_nid) 165 { 166 case NID_sha1: 167 BIO_puts(out, "sha1"); 168 break; 169 170 case NID_md5: 171 BIO_puts(out, "md5"); 172 break; 173 174 case NID_sha256: 175 BIO_puts(out, "sha-256"); 176 break; 177 178 case NID_sha384: 179 BIO_puts(out, "sha-384"); 180 break; 181 182 case NID_sha512: 183 BIO_puts(out, "sha-512"); 184 break; 185 186 default: 187 if (have_unknown) 188 write_comma = 0; 189 else 190 { 191 BIO_puts(out, "unknown"); 192 have_unknown = 1; 193 } 194 break; 195 196 } 197 } 198 199 return 1; 200 201 } 202 203 /* SMIME sender */ 204 205 int int_smime_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, 206 int ctype_nid, int econt_nid, 207 STACK_OF(X509_ALGOR) *mdalgs, 208 asn1_output_data_fn *data_fn, 209 const ASN1_ITEM *it) 210 { 211 char bound[33], c; 212 int i; 213 const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; 214 const char *msg_type=NULL; 215 if (flags & SMIME_OLDMIME) 216 mime_prefix = "application/x-pkcs7-"; 217 else 218 mime_prefix = "application/pkcs7-"; 219 220 if (flags & SMIME_CRLFEOL) 221 mime_eol = "\r\n"; 222 else 223 mime_eol = "\n"; 224 if((flags & SMIME_DETACHED) && data) { 225 /* We want multipart/signed */ 226 /* Generate a random boundary */ 227 RAND_pseudo_bytes((unsigned char *)bound, 32); 228 for(i = 0; i < 32; i++) { 229 c = bound[i] & 0xf; 230 if(c < 10) c += '0'; 231 else c += 'A' - 10; 232 bound[i] = c; 233 } 234 bound[32] = 0; 235 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 236 BIO_printf(bio, "Content-Type: multipart/signed;"); 237 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); 238 BIO_puts(bio, " micalg=\""); 239 asn1_write_micalg(bio, mdalgs); 240 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", 241 bound, mime_eol, mime_eol); 242 BIO_printf(bio, "This is an S/MIME signed message%s%s", 243 mime_eol, mime_eol); 244 /* Now write out the first part */ 245 BIO_printf(bio, "------%s%s", bound, mime_eol); 246 if (!data_fn(bio, data, val, flags, it)) 247 return 0; 248 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); 249 250 /* Headers for signature */ 251 252 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); 253 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); 254 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", 255 mime_eol); 256 BIO_printf(bio, "Content-Disposition: attachment;"); 257 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", 258 mime_eol, mime_eol); 259 B64_write_ASN1(bio, val, NULL, 0, it); 260 BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound, 261 mime_eol, mime_eol); 262 return 1; 263 } 264 265 /* Determine smime-type header */ 266 267 if (ctype_nid == NID_pkcs7_enveloped) 268 msg_type = "enveloped-data"; 269 else if (ctype_nid == NID_pkcs7_signed) 270 { 271 if (econt_nid == NID_id_smime_ct_receipt) 272 msg_type = "signed-receipt"; 273 else if (sk_X509_ALGOR_num(mdalgs) >= 0) 274 msg_type = "signed-data"; 275 else 276 msg_type = "certs-only"; 277 } 278 else if (ctype_nid == NID_id_smime_ct_compressedData) 279 { 280 msg_type = "compressed-data"; 281 cname = "smime.p7z"; 282 } 283 /* MIME headers */ 284 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 285 BIO_printf(bio, "Content-Disposition: attachment;"); 286 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); 287 BIO_printf(bio, "Content-Type: %smime;", mime_prefix); 288 if (msg_type) 289 BIO_printf(bio, " smime-type=%s;", msg_type); 290 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); 291 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", 292 mime_eol, mime_eol); 293 if (!B64_write_ASN1(bio, val, data, flags, it)) 294 return 0; 295 BIO_printf(bio, "%s", mime_eol); 296 return 1; 297 } 298 299 #if 0 300 301 /* Handle output of ASN1 data */ 302 303 304 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, 305 const ASN1_ITEM *it) 306 { 307 BIO *tmpbio; 308 const ASN1_AUX *aux = it->funcs; 309 ASN1_STREAM_ARG sarg; 310 311 if (!(flags & SMIME_DETACHED)) 312 { 313 SMIME_crlf_copy(data, out, flags); 314 return 1; 315 } 316 317 if (!aux || !aux->asn1_cb) 318 { 319 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, 320 ASN1_R_STREAMING_NOT_SUPPORTED); 321 return 0; 322 } 323 324 sarg.out = out; 325 sarg.ndef_bio = NULL; 326 sarg.boundary = NULL; 327 328 /* Let ASN1 code prepend any needed BIOs */ 329 330 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) 331 return 0; 332 333 /* Copy data across, passing through filter BIOs for processing */ 334 SMIME_crlf_copy(data, sarg.ndef_bio, flags); 335 336 /* Finalize structure */ 337 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) 338 return 0; 339 340 /* Now remove any digests prepended to the BIO */ 341 342 while (sarg.ndef_bio != out) 343 { 344 tmpbio = BIO_pop(sarg.ndef_bio); 345 BIO_free(sarg.ndef_bio); 346 sarg.ndef_bio = tmpbio; 347 } 348 349 return 1; 350 351 } 352 353 #endif 354 355 /* SMIME reader: handle multipart/signed and opaque signing. 356 * in multipart case the content is placed in a memory BIO 357 * pointed to by "bcont". In opaque this is set to NULL 358 */ 359 360 ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) 361 { 362 BIO *asnin; 363 STACK_OF(MIME_HEADER) *headers = NULL; 364 STACK_OF(BIO) *parts = NULL; 365 MIME_HEADER *hdr; 366 MIME_PARAM *prm; 367 ASN1_VALUE *val; 368 int ret; 369 370 if(bcont) *bcont = NULL; 371 372 if (!(headers = mime_parse_hdr(bio))) { 373 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR); 374 return NULL; 375 } 376 377 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 378 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 379 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); 380 return NULL; 381 } 382 383 /* Handle multipart/signed */ 384 385 if(!strcmp(hdr->value, "multipart/signed")) { 386 /* Split into two parts */ 387 prm = mime_param_find(hdr, "boundary"); 388 if(!prm || !prm->param_value) { 389 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 390 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); 391 return NULL; 392 } 393 ret = multi_split(bio, prm->param_value, &parts); 394 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 395 if(!ret || (sk_BIO_num(parts) != 2) ) { 396 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); 397 sk_BIO_pop_free(parts, BIO_vfree); 398 return NULL; 399 } 400 401 /* Parse the signature piece */ 402 asnin = sk_BIO_value(parts, 1); 403 404 if (!(headers = mime_parse_hdr(asnin))) { 405 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR); 406 sk_BIO_pop_free(parts, BIO_vfree); 407 return NULL; 408 } 409 410 /* Get content type */ 411 412 if(!(hdr = mime_hdr_find(headers, "content-type")) || 413 !hdr->value) { 414 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 415 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); 416 return NULL; 417 } 418 419 if(strcmp(hdr->value, "application/x-pkcs7-signature") && 420 strcmp(hdr->value, "application/pkcs7-signature")) { 421 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 422 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE); 423 ERR_add_error_data(2, "type: ", hdr->value); 424 sk_BIO_pop_free(parts, BIO_vfree); 425 return NULL; 426 } 427 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 428 /* Read in ASN1 */ 429 if(!(val = b64_read_asn1(asnin, it))) { 430 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR); 431 sk_BIO_pop_free(parts, BIO_vfree); 432 return NULL; 433 } 434 435 if(bcont) { 436 *bcont = sk_BIO_value(parts, 0); 437 BIO_free(asnin); 438 sk_BIO_free(parts); 439 } else sk_BIO_pop_free(parts, BIO_vfree); 440 return val; 441 } 442 443 /* OK, if not multipart/signed try opaque signature */ 444 445 if (strcmp (hdr->value, "application/x-pkcs7-mime") && 446 strcmp (hdr->value, "application/pkcs7-mime")) { 447 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE); 448 ERR_add_error_data(2, "type: ", hdr->value); 449 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 450 return NULL; 451 } 452 453 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 454 455 if(!(val = b64_read_asn1(bio, it))) { 456 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); 457 return NULL; 458 } 459 return val; 460 461 } 462 463 /* Copy text from one BIO to another making the output CRLF at EOL */ 464 int SMIME_crlf_copy(BIO *in, BIO *out, int flags) 465 { 466 BIO *bf; 467 char eol; 468 int len; 469 char linebuf[MAX_SMLEN]; 470 /* Buffer output so we don't write one line at a time. This is 471 * useful when streaming as we don't end up with one OCTET STRING 472 * per line. 473 */ 474 bf = BIO_new(BIO_f_buffer()); 475 if (!bf) 476 return 0; 477 out = BIO_push(bf, out); 478 if(flags & SMIME_BINARY) 479 { 480 while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) 481 BIO_write(out, linebuf, len); 482 } 483 else 484 { 485 if(flags & SMIME_TEXT) 486 BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); 487 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) 488 { 489 eol = strip_eol(linebuf, &len); 490 if (len) 491 BIO_write(out, linebuf, len); 492 if(eol) BIO_write(out, "\r\n", 2); 493 } 494 } 495 (void)BIO_flush(out); 496 BIO_pop(out); 497 BIO_free(bf); 498 return 1; 499 } 500 501 /* Strip off headers if they are text/plain */ 502 int SMIME_text(BIO *in, BIO *out) 503 { 504 char iobuf[4096]; 505 int len; 506 STACK_OF(MIME_HEADER) *headers; 507 MIME_HEADER *hdr; 508 509 if (!(headers = mime_parse_hdr(in))) { 510 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR); 511 return 0; 512 } 513 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 514 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE); 515 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 516 return 0; 517 } 518 if (strcmp (hdr->value, "text/plain")) { 519 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE); 520 ERR_add_error_data(2, "type: ", hdr->value); 521 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 522 return 0; 523 } 524 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 525 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) 526 BIO_write(out, iobuf, len); 527 if (len < 0) 528 return 0; 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 */ 535 536 static 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 6 586 587 588 static 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 } 682 683 return headers; 684 685 } 686 687 static 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 */ 693 static 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? */ 710 static 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 } 727 728 static 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 } 760 761 static 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 } 789 790 static int mime_hdr_cmp(const MIME_HEADER * const *a, 791 const MIME_HEADER * const *b) 792 { 793 return(strcmp((*a)->name, (*b)->name)); 794 } 795 796 static 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) */ 803 804 static 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 } 813 814 static 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 } 823 824 static 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 } 831 832 static 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 */ 844 static 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 } 857 858 static 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