asn_mime.c revision 279264
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#include "asn1_locl.h" 63 64/* Generalised MIME like utilities for streaming ASN1. Although many 65 * have a PKCS7/CMS like flavour others are more general purpose. 66 */ 67 68/* MIME format structures 69 * Note that all are translated to lower case apart from 70 * parameter values. Quotes are stripped off 71 */ 72 73typedef struct { 74char *param_name; /* Param name e.g. "micalg" */ 75char *param_value; /* Param value e.g. "sha1" */ 76} MIME_PARAM; 77 78DECLARE_STACK_OF(MIME_PARAM) 79IMPLEMENT_STACK_OF(MIME_PARAM) 80 81typedef struct { 82char *name; /* Name of line e.g. "content-type" */ 83char *value; /* Value of line e.g. "text/plain" */ 84STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ 85} MIME_HEADER; 86 87DECLARE_STACK_OF(MIME_HEADER) 88IMPLEMENT_STACK_OF(MIME_HEADER) 89 90static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, 91 const ASN1_ITEM *it); 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/* Output an ASN1 structure in BER format streaming if necessary */ 114 115int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, 116 const ASN1_ITEM *it) 117 { 118 /* If streaming create stream BIO and copy all content through it */ 119 if (flags & SMIME_STREAM) 120 { 121 BIO *bio, *tbio; 122 bio = BIO_new_NDEF(out, val, it); 123 if (!bio) 124 { 125 ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM,ERR_R_MALLOC_FAILURE); 126 return 0; 127 } 128 SMIME_crlf_copy(in, bio, flags); 129 (void)BIO_flush(bio); 130 /* Free up successive BIOs until we hit the old output BIO */ 131 do 132 { 133 tbio = BIO_pop(bio); 134 BIO_free(bio); 135 bio = tbio; 136 } while (bio != out); 137 } 138 /* else just write out ASN1 structure which will have all content 139 * stored internally 140 */ 141 else 142 ASN1_item_i2d_bio(it, out, val); 143 return 1; 144 } 145 146/* Base 64 read and write of ASN1 structure */ 147 148static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, 149 const ASN1_ITEM *it) 150 { 151 BIO *b64; 152 int r; 153 b64 = BIO_new(BIO_f_base64()); 154 if(!b64) 155 { 156 ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE); 157 return 0; 158 } 159 /* prepend the b64 BIO so all data is base64 encoded. 160 */ 161 out = BIO_push(b64, out); 162 r = i2d_ASN1_bio_stream(out, val, in, flags, it); 163 (void)BIO_flush(out); 164 BIO_pop(out); 165 BIO_free(b64); 166 return r; 167 } 168 169/* Streaming ASN1 PEM write */ 170 171int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, 172 const char *hdr, 173 const ASN1_ITEM *it) 174 { 175 int r; 176 BIO_printf(out, "-----BEGIN %s-----\n", hdr); 177 r = B64_write_ASN1(out, val, in, flags, it); 178 BIO_printf(out, "-----END %s-----\n", hdr); 179 return r; 180 } 181 182static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) 183{ 184 BIO *b64; 185 ASN1_VALUE *val; 186 if(!(b64 = BIO_new(BIO_f_base64()))) { 187 ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE); 188 return 0; 189 } 190 bio = BIO_push(b64, bio); 191 val = ASN1_item_d2i_bio(it, bio, NULL); 192 if(!val) 193 ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR); 194 (void)BIO_flush(bio); 195 bio = BIO_pop(bio); 196 BIO_free(b64); 197 return val; 198} 199 200/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ 201 202static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) 203 { 204 const EVP_MD *md; 205 int i, have_unknown = 0, write_comma, ret = 0, md_nid; 206 have_unknown = 0; 207 write_comma = 0; 208 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) 209 { 210 if (write_comma) 211 BIO_write(out, ",", 1); 212 write_comma = 1; 213 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); 214 md = EVP_get_digestbynid(md_nid); 215 if (md && md->md_ctrl) 216 { 217 int rv; 218 char *micstr; 219 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); 220 if (rv > 0) 221 { 222 BIO_puts(out, micstr); 223 OPENSSL_free(micstr); 224 continue; 225 } 226 if (rv != -2) 227 goto err; 228 } 229 switch(md_nid) 230 { 231 case NID_sha1: 232 BIO_puts(out, "sha1"); 233 break; 234 235 case NID_md5: 236 BIO_puts(out, "md5"); 237 break; 238 239 case NID_sha256: 240 BIO_puts(out, "sha-256"); 241 break; 242 243 case NID_sha384: 244 BIO_puts(out, "sha-384"); 245 break; 246 247 case NID_sha512: 248 BIO_puts(out, "sha-512"); 249 break; 250 251 case NID_id_GostR3411_94: 252 BIO_puts(out, "gostr3411-94"); 253 goto err; 254 break; 255 256 default: 257 if (have_unknown) 258 write_comma = 0; 259 else 260 { 261 BIO_puts(out, "unknown"); 262 have_unknown = 1; 263 } 264 break; 265 266 } 267 } 268 269 ret = 1; 270 err: 271 272 return ret; 273 274 } 275 276/* SMIME sender */ 277 278int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, 279 int ctype_nid, int econt_nid, 280 STACK_OF(X509_ALGOR) *mdalgs, 281 const ASN1_ITEM *it) 282{ 283 char bound[33], c; 284 int i; 285 const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; 286 const char *msg_type=NULL; 287 if (flags & SMIME_OLDMIME) 288 mime_prefix = "application/x-pkcs7-"; 289 else 290 mime_prefix = "application/pkcs7-"; 291 292 if (flags & SMIME_CRLFEOL) 293 mime_eol = "\r\n"; 294 else 295 mime_eol = "\n"; 296 if((flags & SMIME_DETACHED) && data) { 297 /* We want multipart/signed */ 298 /* Generate a random boundary */ 299 RAND_pseudo_bytes((unsigned char *)bound, 32); 300 for(i = 0; i < 32; i++) { 301 c = bound[i] & 0xf; 302 if(c < 10) c += '0'; 303 else c += 'A' - 10; 304 bound[i] = c; 305 } 306 bound[32] = 0; 307 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 308 BIO_printf(bio, "Content-Type: multipart/signed;"); 309 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); 310 BIO_puts(bio, " micalg=\""); 311 asn1_write_micalg(bio, mdalgs); 312 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", 313 bound, mime_eol, mime_eol); 314 BIO_printf(bio, "This is an S/MIME signed message%s%s", 315 mime_eol, mime_eol); 316 /* Now write out the first part */ 317 BIO_printf(bio, "------%s%s", bound, mime_eol); 318 if (!asn1_output_data(bio, data, val, flags, it)) 319 return 0; 320 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); 321 322 /* Headers for signature */ 323 324 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); 325 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); 326 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", 327 mime_eol); 328 BIO_printf(bio, "Content-Disposition: attachment;"); 329 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", 330 mime_eol, mime_eol); 331 B64_write_ASN1(bio, val, NULL, 0, it); 332 BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound, 333 mime_eol, mime_eol); 334 return 1; 335 } 336 337 /* Determine smime-type header */ 338 339 if (ctype_nid == NID_pkcs7_enveloped) 340 msg_type = "enveloped-data"; 341 else if (ctype_nid == NID_pkcs7_signed) 342 { 343 if (econt_nid == NID_id_smime_ct_receipt) 344 msg_type = "signed-receipt"; 345 else if (sk_X509_ALGOR_num(mdalgs) >= 0) 346 msg_type = "signed-data"; 347 else 348 msg_type = "certs-only"; 349 } 350 else if (ctype_nid == NID_id_smime_ct_compressedData) 351 { 352 msg_type = "compressed-data"; 353 cname = "smime.p7z"; 354 } 355 /* MIME headers */ 356 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 357 BIO_printf(bio, "Content-Disposition: attachment;"); 358 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); 359 BIO_printf(bio, "Content-Type: %smime;", mime_prefix); 360 if (msg_type) 361 BIO_printf(bio, " smime-type=%s;", msg_type); 362 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); 363 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", 364 mime_eol, mime_eol); 365 if (!B64_write_ASN1(bio, val, data, flags, it)) 366 return 0; 367 BIO_printf(bio, "%s", mime_eol); 368 return 1; 369} 370 371/* Handle output of ASN1 data */ 372 373 374static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, 375 const ASN1_ITEM *it) 376 { 377 BIO *tmpbio; 378 const ASN1_AUX *aux = it->funcs; 379 ASN1_STREAM_ARG sarg; 380 int rv = 1; 381 382 /* If data is not deteched or resigning then the output BIO is 383 * already set up to finalise when it is written through. 384 */ 385 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) 386 { 387 SMIME_crlf_copy(data, out, flags); 388 return 1; 389 } 390 391 if (!aux || !aux->asn1_cb) 392 { 393 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, 394 ASN1_R_STREAMING_NOT_SUPPORTED); 395 return 0; 396 } 397 398 sarg.out = out; 399 sarg.ndef_bio = NULL; 400 sarg.boundary = NULL; 401 402 /* Let ASN1 code prepend any needed BIOs */ 403 404 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) 405 return 0; 406 407 /* Copy data across, passing through filter BIOs for processing */ 408 SMIME_crlf_copy(data, sarg.ndef_bio, flags); 409 410 /* Finalize structure */ 411 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) 412 rv = 0; 413 414 /* Now remove any digests prepended to the BIO */ 415 416 while (sarg.ndef_bio != out) 417 { 418 tmpbio = BIO_pop(sarg.ndef_bio); 419 BIO_free(sarg.ndef_bio); 420 sarg.ndef_bio = tmpbio; 421 } 422 423 return rv; 424 425 } 426 427/* SMIME reader: handle multipart/signed and opaque signing. 428 * in multipart case the content is placed in a memory BIO 429 * pointed to by "bcont". In opaque this is set to NULL 430 */ 431 432ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) 433{ 434 BIO *asnin; 435 STACK_OF(MIME_HEADER) *headers = NULL; 436 STACK_OF(BIO) *parts = NULL; 437 MIME_HEADER *hdr; 438 MIME_PARAM *prm; 439 ASN1_VALUE *val; 440 int ret; 441 442 if(bcont) *bcont = NULL; 443 444 if (!(headers = mime_parse_hdr(bio))) { 445 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR); 446 return NULL; 447 } 448 449 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 450 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 451 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); 452 return NULL; 453 } 454 455 /* Handle multipart/signed */ 456 457 if(!strcmp(hdr->value, "multipart/signed")) { 458 /* Split into two parts */ 459 prm = mime_param_find(hdr, "boundary"); 460 if(!prm || !prm->param_value) { 461 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 462 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); 463 return NULL; 464 } 465 ret = multi_split(bio, prm->param_value, &parts); 466 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 467 if(!ret || (sk_BIO_num(parts) != 2) ) { 468 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); 469 sk_BIO_pop_free(parts, BIO_vfree); 470 return NULL; 471 } 472 473 /* Parse the signature piece */ 474 asnin = sk_BIO_value(parts, 1); 475 476 if (!(headers = mime_parse_hdr(asnin))) { 477 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR); 478 sk_BIO_pop_free(parts, BIO_vfree); 479 return NULL; 480 } 481 482 /* Get content type */ 483 484 if(!(hdr = mime_hdr_find(headers, "content-type")) || 485 !hdr->value) { 486 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 487 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); 488 return NULL; 489 } 490 491 if(strcmp(hdr->value, "application/x-pkcs7-signature") && 492 strcmp(hdr->value, "application/pkcs7-signature")) { 493 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE); 494 ERR_add_error_data(2, "type: ", hdr->value); 495 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 496 sk_BIO_pop_free(parts, BIO_vfree); 497 return NULL; 498 } 499 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 500 /* Read in ASN1 */ 501 if(!(val = b64_read_asn1(asnin, it))) { 502 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR); 503 sk_BIO_pop_free(parts, BIO_vfree); 504 return NULL; 505 } 506 507 if(bcont) { 508 *bcont = sk_BIO_value(parts, 0); 509 BIO_free(asnin); 510 sk_BIO_free(parts); 511 } else sk_BIO_pop_free(parts, BIO_vfree); 512 return val; 513 } 514 515 /* OK, if not multipart/signed try opaque signature */ 516 517 if (strcmp (hdr->value, "application/x-pkcs7-mime") && 518 strcmp (hdr->value, "application/pkcs7-mime")) { 519 ASN1err(ASN1_F_SMIME_READ_ASN1,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 NULL; 523 } 524 525 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 526 527 if(!(val = b64_read_asn1(bio, it))) { 528 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); 529 return NULL; 530 } 531 return val; 532 533} 534 535/* Copy text from one BIO to another making the output CRLF at EOL */ 536int SMIME_crlf_copy(BIO *in, BIO *out, int flags) 537{ 538 BIO *bf; 539 char eol; 540 int len; 541 char linebuf[MAX_SMLEN]; 542 /* Buffer output so we don't write one line at a time. This is 543 * useful when streaming as we don't end up with one OCTET STRING 544 * per line. 545 */ 546 bf = BIO_new(BIO_f_buffer()); 547 if (!bf) 548 return 0; 549 out = BIO_push(bf, out); 550 if(flags & SMIME_BINARY) 551 { 552 while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) 553 BIO_write(out, linebuf, len); 554 } 555 else 556 { 557 if(flags & SMIME_TEXT) 558 BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); 559 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) 560 { 561 eol = strip_eol(linebuf, &len); 562 if (len) 563 BIO_write(out, linebuf, len); 564 if(eol) BIO_write(out, "\r\n", 2); 565 } 566 } 567 (void)BIO_flush(out); 568 BIO_pop(out); 569 BIO_free(bf); 570 return 1; 571} 572 573/* Strip off headers if they are text/plain */ 574int SMIME_text(BIO *in, BIO *out) 575{ 576 char iobuf[4096]; 577 int len; 578 STACK_OF(MIME_HEADER) *headers; 579 MIME_HEADER *hdr; 580 581 if (!(headers = mime_parse_hdr(in))) { 582 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR); 583 return 0; 584 } 585 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 586 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE); 587 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 588 return 0; 589 } 590 if (strcmp (hdr->value, "text/plain")) { 591 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE); 592 ERR_add_error_data(2, "type: ", hdr->value); 593 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 594 return 0; 595 } 596 sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 597 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) 598 BIO_write(out, iobuf, len); 599 if (len < 0) 600 return 0; 601 return 1; 602} 603 604/* Split a multipart/XXX message body into component parts: result is 605 * canonical parts in a STACK of bios 606 */ 607 608static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) 609{ 610 char linebuf[MAX_SMLEN]; 611 int len, blen; 612 int eol = 0, next_eol = 0; 613 BIO *bpart = NULL; 614 STACK_OF(BIO) *parts; 615 char state, part, first; 616 617 blen = strlen(bound); 618 part = 0; 619 state = 0; 620 first = 1; 621 parts = sk_BIO_new_null(); 622 *ret = parts; 623 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 624 state = mime_bound_check(linebuf, len, bound, blen); 625 if(state == 1) { 626 first = 1; 627 part++; 628 } else if(state == 2) { 629 sk_BIO_push(parts, bpart); 630 return 1; 631 } else if(part) { 632 /* Strip CR+LF from linebuf */ 633 next_eol = strip_eol(linebuf, &len); 634 if(first) { 635 first = 0; 636 if(bpart) sk_BIO_push(parts, bpart); 637 bpart = BIO_new(BIO_s_mem()); 638 BIO_set_mem_eof_return(bpart, 0); 639 } else if (eol) 640 BIO_write(bpart, "\r\n", 2); 641 eol = next_eol; 642 if (len) 643 BIO_write(bpart, linebuf, len); 644 } 645 } 646 return 0; 647} 648 649/* This is the big one: parse MIME header lines up to message body */ 650 651#define MIME_INVALID 0 652#define MIME_START 1 653#define MIME_TYPE 2 654#define MIME_NAME 3 655#define MIME_VALUE 4 656#define MIME_QUOTE 5 657#define MIME_COMMENT 6 658 659 660static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) 661{ 662 char *p, *q, c; 663 char *ntmp; 664 char linebuf[MAX_SMLEN]; 665 MIME_HEADER *mhdr = NULL; 666 STACK_OF(MIME_HEADER) *headers; 667 int len, state, save_state = 0; 668 669 headers = sk_MIME_HEADER_new(mime_hdr_cmp); 670 if (!headers) 671 return NULL; 672 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 673 /* If whitespace at line start then continuation line */ 674 if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; 675 else state = MIME_START; 676 ntmp = NULL; 677 /* Go through all characters */ 678 for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { 679 680 /* State machine to handle MIME headers 681 * if this looks horrible that's because it *is* 682 */ 683 684 switch(state) { 685 case MIME_START: 686 if(c == ':') { 687 state = MIME_TYPE; 688 *p = 0; 689 ntmp = strip_ends(q); 690 q = p + 1; 691 } 692 break; 693 694 case MIME_TYPE: 695 if(c == ';') { 696 mime_debug("Found End Value\n"); 697 *p = 0; 698 mhdr = mime_hdr_new(ntmp, strip_ends(q)); 699 sk_MIME_HEADER_push(headers, mhdr); 700 ntmp = NULL; 701 q = p + 1; 702 state = MIME_NAME; 703 } else if(c == '(') { 704 save_state = state; 705 state = MIME_COMMENT; 706 } 707 break; 708 709 case MIME_COMMENT: 710 if(c == ')') { 711 state = save_state; 712 } 713 break; 714 715 case MIME_NAME: 716 if(c == '=') { 717 state = MIME_VALUE; 718 *p = 0; 719 ntmp = strip_ends(q); 720 q = p + 1; 721 } 722 break ; 723 724 case MIME_VALUE: 725 if(c == ';') { 726 state = MIME_NAME; 727 *p = 0; 728 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 729 ntmp = NULL; 730 q = p + 1; 731 } else if (c == '"') { 732 mime_debug("Found Quote\n"); 733 state = MIME_QUOTE; 734 } else if(c == '(') { 735 save_state = state; 736 state = MIME_COMMENT; 737 } 738 break; 739 740 case MIME_QUOTE: 741 if(c == '"') { 742 mime_debug("Found Match Quote\n"); 743 state = MIME_VALUE; 744 } 745 break; 746 } 747 } 748 749 if(state == MIME_TYPE) { 750 mhdr = mime_hdr_new(ntmp, strip_ends(q)); 751 sk_MIME_HEADER_push(headers, mhdr); 752 } else if(state == MIME_VALUE) 753 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 754 if(p == linebuf) break; /* Blank line means end of headers */ 755} 756 757return headers; 758 759} 760 761static char *strip_ends(char *name) 762{ 763 return strip_end(strip_start(name)); 764} 765 766/* Strip a parameter of whitespace from start of param */ 767static char *strip_start(char *name) 768{ 769 char *p, c; 770 /* Look for first non white space or quote */ 771 for(p = name; (c = *p) ;p++) { 772 if(c == '"') { 773 /* Next char is start of string if non null */ 774 if(p[1]) return p + 1; 775 /* Else null string */ 776 return NULL; 777 } 778 if(!isspace((unsigned char)c)) return p; 779 } 780 return NULL; 781} 782 783/* As above but strip from end of string : maybe should handle brackets? */ 784static char *strip_end(char *name) 785{ 786 char *p, c; 787 if(!name) return NULL; 788 /* Look for first non white space or quote */ 789 for(p = name + strlen(name) - 1; p >= name ;p--) { 790 c = *p; 791 if(c == '"') { 792 if(p - 1 == name) return NULL; 793 *p = 0; 794 return name; 795 } 796 if(isspace((unsigned char)c)) *p = 0; 797 else return name; 798 } 799 return NULL; 800} 801 802static MIME_HEADER *mime_hdr_new(char *name, char *value) 803{ 804 MIME_HEADER *mhdr; 805 char *tmpname, *tmpval, *p; 806 int c; 807 if(name) { 808 if(!(tmpname = BUF_strdup(name))) return NULL; 809 for(p = tmpname ; *p; p++) { 810 c = (unsigned char)*p; 811 if(isupper(c)) { 812 c = tolower(c); 813 *p = c; 814 } 815 } 816 } else tmpname = NULL; 817 if(value) { 818 if(!(tmpval = BUF_strdup(value))) return NULL; 819 for(p = tmpval ; *p; p++) { 820 c = (unsigned char)*p; 821 if(isupper(c)) { 822 c = tolower(c); 823 *p = c; 824 } 825 } 826 } else tmpval = NULL; 827 mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); 828 if(!mhdr) return NULL; 829 mhdr->name = tmpname; 830 mhdr->value = tmpval; 831 if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; 832 return mhdr; 833} 834 835static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) 836{ 837 char *tmpname, *tmpval, *p; 838 int c; 839 MIME_PARAM *mparam; 840 if(name) { 841 tmpname = BUF_strdup(name); 842 if(!tmpname) return 0; 843 for(p = tmpname ; *p; p++) { 844 c = (unsigned char)*p; 845 if(isupper(c)) { 846 c = tolower(c); 847 *p = c; 848 } 849 } 850 } else tmpname = NULL; 851 if(value) { 852 tmpval = BUF_strdup(value); 853 if(!tmpval) return 0; 854 } else tmpval = NULL; 855 /* Parameter values are case sensitive so leave as is */ 856 mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); 857 if(!mparam) return 0; 858 mparam->param_name = tmpname; 859 mparam->param_value = tmpval; 860 sk_MIME_PARAM_push(mhdr->params, mparam); 861 return 1; 862} 863 864static int mime_hdr_cmp(const MIME_HEADER * const *a, 865 const MIME_HEADER * const *b) 866{ 867 if (!(*a)->name || !(*b)->name) 868 return !!(*a)->name - !!(*b)->name; 869 870 return(strcmp((*a)->name, (*b)->name)); 871} 872 873static int mime_param_cmp(const MIME_PARAM * const *a, 874 const MIME_PARAM * const *b) 875{ 876 if (!(*a)->param_name || !(*b)->param_name) 877 return !!(*a)->param_name - !!(*b)->param_name; 878 return(strcmp((*a)->param_name, (*b)->param_name)); 879} 880 881/* Find a header with a given name (if possible) */ 882 883static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) 884{ 885 MIME_HEADER htmp; 886 int idx; 887 htmp.name = name; 888 idx = sk_MIME_HEADER_find(hdrs, &htmp); 889 if(idx < 0) return NULL; 890 return sk_MIME_HEADER_value(hdrs, idx); 891} 892 893static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) 894{ 895 MIME_PARAM param; 896 int idx; 897 param.param_name = name; 898 idx = sk_MIME_PARAM_find(hdr->params, ¶m); 899 if(idx < 0) return NULL; 900 return sk_MIME_PARAM_value(hdr->params, idx); 901} 902 903static void mime_hdr_free(MIME_HEADER *hdr) 904{ 905 if(hdr->name) OPENSSL_free(hdr->name); 906 if(hdr->value) OPENSSL_free(hdr->value); 907 if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); 908 OPENSSL_free(hdr); 909} 910 911static void mime_param_free(MIME_PARAM *param) 912{ 913 if(param->param_name) OPENSSL_free(param->param_name); 914 if(param->param_value) OPENSSL_free(param->param_value); 915 OPENSSL_free(param); 916} 917 918/* Check for a multipart boundary. Returns: 919 * 0 : no boundary 920 * 1 : part boundary 921 * 2 : final boundary 922 */ 923static int mime_bound_check(char *line, int linelen, char *bound, int blen) 924{ 925 if(linelen == -1) linelen = strlen(line); 926 if(blen == -1) blen = strlen(bound); 927 /* Quickly eliminate if line length too short */ 928 if(blen + 2 > linelen) return 0; 929 /* Check for part boundary */ 930 if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { 931 if(!strncmp(line + blen + 2, "--", 2)) return 2; 932 else return 1; 933 } 934 return 0; 935} 936 937static int strip_eol(char *linebuf, int *plen) 938 { 939 int len = *plen; 940 char *p, c; 941 int is_eol = 0; 942 p = linebuf + len - 1; 943 for (p = linebuf + len - 1; len > 0; len--, p--) 944 { 945 c = *p; 946 if (c == '\n') 947 is_eol = 1; 948 else if (c != '\r') 949 break; 950 } 951 *plen = len; 952 return is_eol; 953 } 954