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| 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 | |
| 73 typedef struct { | |
| 74 char *param_name; /* Param name e.g. "micalg" */ | |
| 75 char *param_value; /* Param value e.g. "sha1" */ | |
| 76 } MIME_PARAM; | |
| 77 | |
| 78 DECLARE_STACK_OF(MIME_PARAM) | |
| 79 IMPLEMENT_STACK_OF(MIME_PARAM) | |
| 80 | |
| 81 typedef struct { | |
| 82 char *name; /* Name of line e.g. "content-type" */ | |
| 83 char *value; /* Value of line e.g. "text/plain" */ | |
| 84 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ | |
| 85 } MIME_HEADER; | |
| 86 | |
| 87 DECLARE_STACK_OF(MIME_HEADER) | |
| 88 IMPLEMENT_STACK_OF(MIME_HEADER) | |
| 89 | |
| 90 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
| 91 const ASN1_ITEM *it); | |
| 92 static char * strip_ends(char *name); | |
| 93 static char * strip_start(char *name); | |
| 94 static char * strip_end(char *name); | |
| 95 static MIME_HEADER *mime_hdr_new(char *name, char *value); | |
| 96 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); | |
| 97 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); | |
| 98 static int mime_hdr_cmp(const MIME_HEADER * const *a, | |
| 99 const MIME_HEADER * const *b); | |
| 100 static int mime_param_cmp(const MIME_PARAM * const *a, | |
| 101 const MIME_PARAM * const *b); | |
| 102 static void mime_param_free(MIME_PARAM *param); | |
| 103 static int mime_bound_check(char *line, int linelen, char *bound, int blen); | |
| 104 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); | |
| 105 static int strip_eol(char *linebuf, int *plen); | |
| 106 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); | |
| 107 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); | |
| 108 static void mime_hdr_free(MIME_HEADER *hdr); | |
| 109 | |
| 110 #define MAX_SMLEN 1024 | |
| 111 #define mime_debug(x) /* x */ | |
| 112 | |
| 113 /* Output an ASN1 structure in BER format streaming if necessary */ | |
| 114 | |
| 115 int 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 | |
| 148 static 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 | |
| 171 int 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 | |
| 182 static 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 | |
| 202 static 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 | |
| 278 int 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 | |
| 374 static 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 | |
| 432 ASN1_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_BOUN
DARY); | |
| 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_ERR
OR); | |
| 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_TY
PE); | |
| 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_T
YPE); | |
| 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_ERR
OR); | |
| 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 */ | |
| 536 int 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 */ | |
| 574 int 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 | |
| 608 static 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 | |
| 660 static 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 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
| 671 /* If whitespace at line start then continuation line */ | |
| 672 if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; | |
| 673 else state = MIME_START; | |
| 674 ntmp = NULL; | |
| 675 /* Go through all characters */ | |
| 676 for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { | |
| 677 | |
| 678 /* State machine to handle MIME headers | |
| 679 * if this looks horrible that's because it *is* | |
| 680 */ | |
| 681 | |
| 682 switch(state) { | |
| 683 case MIME_START: | |
| 684 if(c == ':') { | |
| 685 state = MIME_TYPE; | |
| 686 *p = 0; | |
| 687 ntmp = strip_ends(q); | |
| 688 q = p + 1; | |
| 689 } | |
| 690 break; | |
| 691 | |
| 692 case MIME_TYPE: | |
| 693 if(c == ';') { | |
| 694 mime_debug("Found End Value\n"); | |
| 695 *p = 0; | |
| 696 mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
| 697 sk_MIME_HEADER_push(headers, mhdr); | |
| 698 ntmp = NULL; | |
| 699 q = p + 1; | |
| 700 state = MIME_NAME; | |
| 701 } else if(c == '(') { | |
| 702 save_state = state; | |
| 703 state = MIME_COMMENT; | |
| 704 } | |
| 705 break; | |
| 706 | |
| 707 case MIME_COMMENT: | |
| 708 if(c == ')') { | |
| 709 state = save_state; | |
| 710 } | |
| 711 break; | |
| 712 | |
| 713 case MIME_NAME: | |
| 714 if(c == '=') { | |
| 715 state = MIME_VALUE; | |
| 716 *p = 0; | |
| 717 ntmp = strip_ends(q); | |
| 718 q = p + 1; | |
| 719 } | |
| 720 break ; | |
| 721 | |
| 722 case MIME_VALUE: | |
| 723 if(c == ';') { | |
| 724 state = MIME_NAME; | |
| 725 *p = 0; | |
| 726 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
| 727 ntmp = NULL; | |
| 728 q = p + 1; | |
| 729 } else if (c == '"') { | |
| 730 mime_debug("Found Quote\n"); | |
| 731 state = MIME_QUOTE; | |
| 732 } else if(c == '(') { | |
| 733 save_state = state; | |
| 734 state = MIME_COMMENT; | |
| 735 } | |
| 736 break; | |
| 737 | |
| 738 case MIME_QUOTE: | |
| 739 if(c == '"') { | |
| 740 mime_debug("Found Match Quote\n"); | |
| 741 state = MIME_VALUE; | |
| 742 } | |
| 743 break; | |
| 744 } | |
| 745 } | |
| 746 | |
| 747 if(state == MIME_TYPE) { | |
| 748 mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
| 749 sk_MIME_HEADER_push(headers, mhdr); | |
| 750 } else if(state == MIME_VALUE) | |
| 751 mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
| 752 if(p == linebuf) break; /* Blank line means end of headers */ | |
| 753 } | |
| 754 | |
| 755 return headers; | |
| 756 | |
| 757 } | |
| 758 | |
| 759 static char *strip_ends(char *name) | |
| 760 { | |
| 761 return strip_end(strip_start(name)); | |
| 762 } | |
| 763 | |
| 764 /* Strip a parameter of whitespace from start of param */ | |
| 765 static char *strip_start(char *name) | |
| 766 { | |
| 767 char *p, c; | |
| 768 /* Look for first non white space or quote */ | |
| 769 for(p = name; (c = *p) ;p++) { | |
| 770 if(c == '"') { | |
| 771 /* Next char is start of string if non null */ | |
| 772 if(p[1]) return p + 1; | |
| 773 /* Else null string */ | |
| 774 return NULL; | |
| 775 } | |
| 776 if(!isspace((unsigned char)c)) return p; | |
| 777 } | |
| 778 return NULL; | |
| 779 } | |
| 780 | |
| 781 /* As above but strip from end of string : maybe should handle brackets? */ | |
| 782 static char *strip_end(char *name) | |
| 783 { | |
| 784 char *p, c; | |
| 785 if(!name) return NULL; | |
| 786 /* Look for first non white space or quote */ | |
| 787 for(p = name + strlen(name) - 1; p >= name ;p--) { | |
| 788 c = *p; | |
| 789 if(c == '"') { | |
| 790 if(p - 1 == name) return NULL; | |
| 791 *p = 0; | |
| 792 return name; | |
| 793 } | |
| 794 if(isspace((unsigned char)c)) *p = 0; | |
| 795 else return name; | |
| 796 } | |
| 797 return NULL; | |
| 798 } | |
| 799 | |
| 800 static MIME_HEADER *mime_hdr_new(char *name, char *value) | |
| 801 { | |
| 802 MIME_HEADER *mhdr; | |
| 803 char *tmpname, *tmpval, *p; | |
| 804 int c; | |
| 805 if(name) { | |
| 806 if(!(tmpname = BUF_strdup(name))) return NULL; | |
| 807 for(p = tmpname ; *p; p++) { | |
| 808 c = (unsigned char)*p; | |
| 809 if(isupper(c)) { | |
| 810 c = tolower(c); | |
| 811 *p = c; | |
| 812 } | |
| 813 } | |
| 814 } else tmpname = NULL; | |
| 815 if(value) { | |
| 816 if(!(tmpval = BUF_strdup(value))) return NULL; | |
| 817 for(p = tmpval ; *p; p++) { | |
| 818 c = (unsigned char)*p; | |
| 819 if(isupper(c)) { | |
| 820 c = tolower(c); | |
| 821 *p = c; | |
| 822 } | |
| 823 } | |
| 824 } else tmpval = NULL; | |
| 825 mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); | |
| 826 if(!mhdr) return NULL; | |
| 827 mhdr->name = tmpname; | |
| 828 mhdr->value = tmpval; | |
| 829 if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; | |
| 830 return mhdr; | |
| 831 } | |
| 832 | |
| 833 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) | |
| 834 { | |
| 835 char *tmpname, *tmpval, *p; | |
| 836 int c; | |
| 837 MIME_PARAM *mparam; | |
| 838 if(name) { | |
| 839 tmpname = BUF_strdup(name); | |
| 840 if(!tmpname) return 0; | |
| 841 for(p = tmpname ; *p; p++) { | |
| 842 c = (unsigned char)*p; | |
| 843 if(isupper(c)) { | |
| 844 c = tolower(c); | |
| 845 *p = c; | |
| 846 } | |
| 847 } | |
| 848 } else tmpname = NULL; | |
| 849 if(value) { | |
| 850 tmpval = BUF_strdup(value); | |
| 851 if(!tmpval) return 0; | |
| 852 } else tmpval = NULL; | |
| 853 /* Parameter values are case sensitive so leave as is */ | |
| 854 mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); | |
| 855 if(!mparam) return 0; | |
| 856 mparam->param_name = tmpname; | |
| 857 mparam->param_value = tmpval; | |
| 858 sk_MIME_PARAM_push(mhdr->params, mparam); | |
| 859 return 1; | |
| 860 } | |
| 861 | |
| 862 static int mime_hdr_cmp(const MIME_HEADER * const *a, | |
| 863 const MIME_HEADER * const *b) | |
| 864 { | |
| 865 if (!(*a)->name || !(*b)->name) | |
| 866 return !!(*a)->name - !!(*b)->name; | |
| 867 | |
| 868 return(strcmp((*a)->name, (*b)->name)); | |
| 869 } | |
| 870 | |
| 871 static int mime_param_cmp(const MIME_PARAM * const *a, | |
| 872 const MIME_PARAM * const *b) | |
| 873 { | |
| 874 if (!(*a)->param_name || !(*b)->param_name) | |
| 875 return !!(*a)->param_name - !!(*b)->param_name; | |
| 876 return(strcmp((*a)->param_name, (*b)->param_name)); | |
| 877 } | |
| 878 | |
| 879 /* Find a header with a given name (if possible) */ | |
| 880 | |
| 881 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) | |
| 882 { | |
| 883 MIME_HEADER htmp; | |
| 884 int idx; | |
| 885 htmp.name = name; | |
| 886 idx = sk_MIME_HEADER_find(hdrs, &htmp); | |
| 887 if(idx < 0) return NULL; | |
| 888 return sk_MIME_HEADER_value(hdrs, idx); | |
| 889 } | |
| 890 | |
| 891 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
| 892 { | |
| 893 MIME_PARAM param; | |
| 894 int idx; | |
| 895 param.param_name = name; | |
| 896 idx = sk_MIME_PARAM_find(hdr->params, ¶m); | |
| 897 if(idx < 0) return NULL; | |
| 898 return sk_MIME_PARAM_value(hdr->params, idx); | |
| 899 } | |
| 900 | |
| 901 static void mime_hdr_free(MIME_HEADER *hdr) | |
| 902 { | |
| 903 if(hdr->name) OPENSSL_free(hdr->name); | |
| 904 if(hdr->value) OPENSSL_free(hdr->value); | |
| 905 if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
| 906 OPENSSL_free(hdr); | |
| 907 } | |
| 908 | |
| 909 static void mime_param_free(MIME_PARAM *param) | |
| 910 { | |
| 911 if(param->param_name) OPENSSL_free(param->param_name); | |
| 912 if(param->param_value) OPENSSL_free(param->param_value); | |
| 913 OPENSSL_free(param); | |
| 914 } | |
| 915 | |
| 916 /* Check for a multipart boundary. Returns: | |
| 917 * 0 : no boundary | |
| 918 * 1 : part boundary | |
| 919 * 2 : final boundary | |
| 920 */ | |
| 921 static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
| 922 { | |
| 923 if(linelen == -1) linelen = strlen(line); | |
| 924 if(blen == -1) blen = strlen(bound); | |
| 925 /* Quickly eliminate if line length too short */ | |
| 926 if(blen + 2 > linelen) return 0; | |
| 927 /* Check for part boundary */ | |
| 928 if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { | |
| 929 if(!strncmp(line + blen + 2, "--", 2)) return 2; | |
| 930 else return 1; | |
| 931 } | |
| 932 return 0; | |
| 933 } | |
| 934 | |
| 935 static int strip_eol(char *linebuf, int *plen) | |
| 936 { | |
| 937 int len = *plen; | |
| 938 char *p, c; | |
| 939 int is_eol = 0; | |
| 940 p = linebuf + len - 1; | |
| 941 for (p = linebuf + len - 1; len > 0; len--, p--) | |
| 942 { | |
| 943 c = *p; | |
| 944 if (c == '\n') | |
| 945 is_eol = 1; | |
| 946 else if (c != '\r') | |
| 947 break; | |
| 948 } | |
| 949 *plen = len; | |
| 950 return is_eol; | |
| 951 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master