Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 380 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 381 | if (!(flags & SMIME_DETACHED)) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 382 | { |
| 383 | SMIME_crlf_copy(data, out, flags); |
| 384 | return 1; |
| 385 | } |
| 386 | |
| 387 | if (!aux || !aux->asn1_cb) |
| 388 | { |
| 389 | ASN1err(ASN1_F_ASN1_OUTPUT_DATA, |
| 390 | ASN1_R_STREAMING_NOT_SUPPORTED); |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | sarg.out = out; |
| 395 | sarg.ndef_bio = NULL; |
| 396 | sarg.boundary = NULL; |
| 397 | |
| 398 | /* Let ASN1 code prepend any needed BIOs */ |
| 399 | |
| 400 | if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) |
| 401 | return 0; |
| 402 | |
| 403 | /* Copy data across, passing through filter BIOs for processing */ |
| 404 | SMIME_crlf_copy(data, sarg.ndef_bio, flags); |
| 405 | |
| 406 | /* Finalize structure */ |
| 407 | if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 408 | return 0; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 409 | |
| 410 | /* Now remove any digests prepended to the BIO */ |
| 411 | |
| 412 | while (sarg.ndef_bio != out) |
| 413 | { |
| 414 | tmpbio = BIO_pop(sarg.ndef_bio); |
| 415 | BIO_free(sarg.ndef_bio); |
| 416 | sarg.ndef_bio = tmpbio; |
| 417 | } |
| 418 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 419 | return 1; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 420 | |
| 421 | } |
| 422 | |
| 423 | /* SMIME reader: handle multipart/signed and opaque signing. |
| 424 | * in multipart case the content is placed in a memory BIO |
| 425 | * pointed to by "bcont". In opaque this is set to NULL |
| 426 | */ |
| 427 | |
| 428 | ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) |
| 429 | { |
| 430 | BIO *asnin; |
| 431 | STACK_OF(MIME_HEADER) *headers = NULL; |
| 432 | STACK_OF(BIO) *parts = NULL; |
| 433 | MIME_HEADER *hdr; |
| 434 | MIME_PARAM *prm; |
| 435 | ASN1_VALUE *val; |
| 436 | int ret; |
| 437 | |
| 438 | if(bcont) *bcont = NULL; |
| 439 | |
| 440 | if (!(headers = mime_parse_hdr(bio))) { |
| 441 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR); |
| 442 | return NULL; |
| 443 | } |
| 444 | |
| 445 | if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { |
| 446 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 447 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); |
| 448 | return NULL; |
| 449 | } |
| 450 | |
| 451 | /* Handle multipart/signed */ |
| 452 | |
| 453 | if(!strcmp(hdr->value, "multipart/signed")) { |
| 454 | /* Split into two parts */ |
| 455 | prm = mime_param_find(hdr, "boundary"); |
| 456 | if(!prm || !prm->param_value) { |
| 457 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 458 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); |
| 459 | return NULL; |
| 460 | } |
| 461 | ret = multi_split(bio, prm->param_value, &parts); |
| 462 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 463 | if(!ret || (sk_BIO_num(parts) != 2) ) { |
| 464 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); |
| 465 | sk_BIO_pop_free(parts, BIO_vfree); |
| 466 | return NULL; |
| 467 | } |
| 468 | |
| 469 | /* Parse the signature piece */ |
| 470 | asnin = sk_BIO_value(parts, 1); |
| 471 | |
| 472 | if (!(headers = mime_parse_hdr(asnin))) { |
| 473 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR); |
| 474 | sk_BIO_pop_free(parts, BIO_vfree); |
| 475 | return NULL; |
| 476 | } |
| 477 | |
| 478 | /* Get content type */ |
| 479 | |
| 480 | if(!(hdr = mime_hdr_find(headers, "content-type")) || |
| 481 | !hdr->value) { |
| 482 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 483 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); |
| 484 | return NULL; |
| 485 | } |
| 486 | |
| 487 | if(strcmp(hdr->value, "application/x-pkcs7-signature") && |
| 488 | strcmp(hdr->value, "application/pkcs7-signature")) { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 489 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 490 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE); |
| 491 | ERR_add_error_data(2, "type: ", hdr->value); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 492 | sk_BIO_pop_free(parts, BIO_vfree); |
| 493 | return NULL; |
| 494 | } |
| 495 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 496 | /* Read in ASN1 */ |
| 497 | if(!(val = b64_read_asn1(asnin, it))) { |
| 498 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR); |
| 499 | sk_BIO_pop_free(parts, BIO_vfree); |
| 500 | return NULL; |
| 501 | } |
| 502 | |
| 503 | if(bcont) { |
| 504 | *bcont = sk_BIO_value(parts, 0); |
| 505 | BIO_free(asnin); |
| 506 | sk_BIO_free(parts); |
| 507 | } else sk_BIO_pop_free(parts, BIO_vfree); |
| 508 | return val; |
| 509 | } |
| 510 | |
| 511 | /* OK, if not multipart/signed try opaque signature */ |
| 512 | |
| 513 | if (strcmp (hdr->value, "application/x-pkcs7-mime") && |
| 514 | strcmp (hdr->value, "application/pkcs7-mime")) { |
| 515 | ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE); |
| 516 | ERR_add_error_data(2, "type: ", hdr->value); |
| 517 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 518 | return NULL; |
| 519 | } |
| 520 | |
| 521 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 522 | |
| 523 | if(!(val = b64_read_asn1(bio, it))) { |
| 524 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); |
| 525 | return NULL; |
| 526 | } |
| 527 | return val; |
| 528 | |
| 529 | } |
| 530 | |
| 531 | /* Copy text from one BIO to another making the output CRLF at EOL */ |
| 532 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags) |
| 533 | { |
| 534 | BIO *bf; |
| 535 | char eol; |
| 536 | int len; |
| 537 | char linebuf[MAX_SMLEN]; |
| 538 | /* Buffer output so we don't write one line at a time. This is |
| 539 | * useful when streaming as we don't end up with one OCTET STRING |
| 540 | * per line. |
| 541 | */ |
| 542 | bf = BIO_new(BIO_f_buffer()); |
| 543 | if (!bf) |
| 544 | return 0; |
| 545 | out = BIO_push(bf, out); |
| 546 | if(flags & SMIME_BINARY) |
| 547 | { |
| 548 | while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) |
| 549 | BIO_write(out, linebuf, len); |
| 550 | } |
| 551 | else |
| 552 | { |
| 553 | if(flags & SMIME_TEXT) |
| 554 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); |
| 555 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) |
| 556 | { |
| 557 | eol = strip_eol(linebuf, &len); |
| 558 | if (len) |
| 559 | BIO_write(out, linebuf, len); |
| 560 | if(eol) BIO_write(out, "\r\n", 2); |
| 561 | } |
| 562 | } |
| 563 | (void)BIO_flush(out); |
| 564 | BIO_pop(out); |
| 565 | BIO_free(bf); |
| 566 | return 1; |
| 567 | } |
| 568 | |
| 569 | /* Strip off headers if they are text/plain */ |
| 570 | int SMIME_text(BIO *in, BIO *out) |
| 571 | { |
| 572 | char iobuf[4096]; |
| 573 | int len; |
| 574 | STACK_OF(MIME_HEADER) *headers; |
| 575 | MIME_HEADER *hdr; |
| 576 | |
| 577 | if (!(headers = mime_parse_hdr(in))) { |
| 578 | ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR); |
| 579 | return 0; |
| 580 | } |
| 581 | if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { |
| 582 | ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE); |
| 583 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 584 | return 0; |
| 585 | } |
| 586 | if (strcmp (hdr->value, "text/plain")) { |
| 587 | ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE); |
| 588 | ERR_add_error_data(2, "type: ", hdr->value); |
| 589 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 590 | return 0; |
| 591 | } |
| 592 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| 593 | while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) |
| 594 | BIO_write(out, iobuf, len); |
| 595 | if (len < 0) |
| 596 | return 0; |
| 597 | return 1; |
| 598 | } |
| 599 | |
| 600 | /* Split a multipart/XXX message body into component parts: result is |
| 601 | * canonical parts in a STACK of bios |
| 602 | */ |
| 603 | |
| 604 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) |
| 605 | { |
| 606 | char linebuf[MAX_SMLEN]; |
| 607 | int len, blen; |
| 608 | int eol = 0, next_eol = 0; |
| 609 | BIO *bpart = NULL; |
| 610 | STACK_OF(BIO) *parts; |
| 611 | char state, part, first; |
| 612 | |
| 613 | blen = strlen(bound); |
| 614 | part = 0; |
| 615 | state = 0; |
| 616 | first = 1; |
| 617 | parts = sk_BIO_new_null(); |
| 618 | *ret = parts; |
| 619 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { |
| 620 | state = mime_bound_check(linebuf, len, bound, blen); |
| 621 | if(state == 1) { |
| 622 | first = 1; |
| 623 | part++; |
| 624 | } else if(state == 2) { |
| 625 | sk_BIO_push(parts, bpart); |
| 626 | return 1; |
| 627 | } else if(part) { |
| 628 | /* Strip CR+LF from linebuf */ |
| 629 | next_eol = strip_eol(linebuf, &len); |
| 630 | if(first) { |
| 631 | first = 0; |
| 632 | if(bpart) sk_BIO_push(parts, bpart); |
| 633 | bpart = BIO_new(BIO_s_mem()); |
| 634 | BIO_set_mem_eof_return(bpart, 0); |
| 635 | } else if (eol) |
| 636 | BIO_write(bpart, "\r\n", 2); |
| 637 | eol = next_eol; |
| 638 | if (len) |
| 639 | BIO_write(bpart, linebuf, len); |
| 640 | } |
| 641 | } |
| 642 | return 0; |
| 643 | } |
| 644 | |
| 645 | /* This is the big one: parse MIME header lines up to message body */ |
| 646 | |
| 647 | #define MIME_INVALID 0 |
| 648 | #define MIME_START 1 |
| 649 | #define MIME_TYPE 2 |
| 650 | #define MIME_NAME 3 |
| 651 | #define MIME_VALUE 4 |
| 652 | #define MIME_QUOTE 5 |
| 653 | #define MIME_COMMENT 6 |
| 654 | |
| 655 | |
| 656 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) |
| 657 | { |
| 658 | char *p, *q, c; |
| 659 | char *ntmp; |
| 660 | char linebuf[MAX_SMLEN]; |
| 661 | MIME_HEADER *mhdr = NULL; |
| 662 | STACK_OF(MIME_HEADER) *headers; |
| 663 | int len, state, save_state = 0; |
| 664 | |
| 665 | headers = sk_MIME_HEADER_new(mime_hdr_cmp); |
| 666 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { |
| 667 | /* If whitespace at line start then continuation line */ |
| 668 | if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; |
| 669 | else state = MIME_START; |
| 670 | ntmp = NULL; |
| 671 | /* Go through all characters */ |
| 672 | for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { |
| 673 | |
| 674 | /* State machine to handle MIME headers |
| 675 | * if this looks horrible that's because it *is* |
| 676 | */ |
| 677 | |
| 678 | switch(state) { |
| 679 | case MIME_START: |
| 680 | if(c == ':') { |
| 681 | state = MIME_TYPE; |
| 682 | *p = 0; |
| 683 | ntmp = strip_ends(q); |
| 684 | q = p + 1; |
| 685 | } |
| 686 | break; |
| 687 | |
| 688 | case MIME_TYPE: |
| 689 | if(c == ';') { |
| 690 | mime_debug("Found End Value\n"); |
| 691 | *p = 0; |
| 692 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); |
| 693 | sk_MIME_HEADER_push(headers, mhdr); |
| 694 | ntmp = NULL; |
| 695 | q = p + 1; |
| 696 | state = MIME_NAME; |
| 697 | } else if(c == '(') { |
| 698 | save_state = state; |
| 699 | state = MIME_COMMENT; |
| 700 | } |
| 701 | break; |
| 702 | |
| 703 | case MIME_COMMENT: |
| 704 | if(c == ')') { |
| 705 | state = save_state; |
| 706 | } |
| 707 | break; |
| 708 | |
| 709 | case MIME_NAME: |
| 710 | if(c == '=') { |
| 711 | state = MIME_VALUE; |
| 712 | *p = 0; |
| 713 | ntmp = strip_ends(q); |
| 714 | q = p + 1; |
| 715 | } |
| 716 | break ; |
| 717 | |
| 718 | case MIME_VALUE: |
| 719 | if(c == ';') { |
| 720 | state = MIME_NAME; |
| 721 | *p = 0; |
| 722 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); |
| 723 | ntmp = NULL; |
| 724 | q = p + 1; |
| 725 | } else if (c == '"') { |
| 726 | mime_debug("Found Quote\n"); |
| 727 | state = MIME_QUOTE; |
| 728 | } else if(c == '(') { |
| 729 | save_state = state; |
| 730 | state = MIME_COMMENT; |
| 731 | } |
| 732 | break; |
| 733 | |
| 734 | case MIME_QUOTE: |
| 735 | if(c == '"') { |
| 736 | mime_debug("Found Match Quote\n"); |
| 737 | state = MIME_VALUE; |
| 738 | } |
| 739 | break; |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | if(state == MIME_TYPE) { |
| 744 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); |
| 745 | sk_MIME_HEADER_push(headers, mhdr); |
| 746 | } else if(state == MIME_VALUE) |
| 747 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); |
| 748 | if(p == linebuf) break; /* Blank line means end of headers */ |
| 749 | } |
| 750 | |
| 751 | return headers; |
| 752 | |
| 753 | } |
| 754 | |
| 755 | static char *strip_ends(char *name) |
| 756 | { |
| 757 | return strip_end(strip_start(name)); |
| 758 | } |
| 759 | |
| 760 | /* Strip a parameter of whitespace from start of param */ |
| 761 | static char *strip_start(char *name) |
| 762 | { |
| 763 | char *p, c; |
| 764 | /* Look for first non white space or quote */ |
| 765 | for(p = name; (c = *p) ;p++) { |
| 766 | if(c == '"') { |
| 767 | /* Next char is start of string if non null */ |
| 768 | if(p[1]) return p + 1; |
| 769 | /* Else null string */ |
| 770 | return NULL; |
| 771 | } |
| 772 | if(!isspace((unsigned char)c)) return p; |
| 773 | } |
| 774 | return NULL; |
| 775 | } |
| 776 | |
| 777 | /* As above but strip from end of string : maybe should handle brackets? */ |
| 778 | static char *strip_end(char *name) |
| 779 | { |
| 780 | char *p, c; |
| 781 | if(!name) return NULL; |
| 782 | /* Look for first non white space or quote */ |
| 783 | for(p = name + strlen(name) - 1; p >= name ;p--) { |
| 784 | c = *p; |
| 785 | if(c == '"') { |
| 786 | if(p - 1 == name) return NULL; |
| 787 | *p = 0; |
| 788 | return name; |
| 789 | } |
| 790 | if(isspace((unsigned char)c)) *p = 0; |
| 791 | else return name; |
| 792 | } |
| 793 | return NULL; |
| 794 | } |
| 795 | |
| 796 | static MIME_HEADER *mime_hdr_new(char *name, char *value) |
| 797 | { |
| 798 | MIME_HEADER *mhdr; |
| 799 | char *tmpname, *tmpval, *p; |
| 800 | int c; |
| 801 | if(name) { |
| 802 | if(!(tmpname = BUF_strdup(name))) return NULL; |
| 803 | for(p = tmpname ; *p; p++) { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 804 | c = *p; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 805 | if(isupper(c)) { |
| 806 | c = tolower(c); |
| 807 | *p = c; |
| 808 | } |
| 809 | } |
| 810 | } else tmpname = NULL; |
| 811 | if(value) { |
| 812 | if(!(tmpval = BUF_strdup(value))) return NULL; |
| 813 | for(p = tmpval ; *p; p++) { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 814 | c = *p; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 815 | if(isupper(c)) { |
| 816 | c = tolower(c); |
| 817 | *p = c; |
| 818 | } |
| 819 | } |
| 820 | } else tmpval = NULL; |
| 821 | mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); |
| 822 | if(!mhdr) return NULL; |
| 823 | mhdr->name = tmpname; |
| 824 | mhdr->value = tmpval; |
| 825 | if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; |
| 826 | return mhdr; |
| 827 | } |
| 828 | |
| 829 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) |
| 830 | { |
| 831 | char *tmpname, *tmpval, *p; |
| 832 | int c; |
| 833 | MIME_PARAM *mparam; |
| 834 | if(name) { |
| 835 | tmpname = BUF_strdup(name); |
| 836 | if(!tmpname) return 0; |
| 837 | for(p = tmpname ; *p; p++) { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 838 | c = *p; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 839 | if(isupper(c)) { |
| 840 | c = tolower(c); |
| 841 | *p = c; |
| 842 | } |
| 843 | } |
| 844 | } else tmpname = NULL; |
| 845 | if(value) { |
| 846 | tmpval = BUF_strdup(value); |
| 847 | if(!tmpval) return 0; |
| 848 | } else tmpval = NULL; |
| 849 | /* Parameter values are case sensitive so leave as is */ |
| 850 | mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); |
| 851 | if(!mparam) return 0; |
| 852 | mparam->param_name = tmpname; |
| 853 | mparam->param_value = tmpval; |
| 854 | sk_MIME_PARAM_push(mhdr->params, mparam); |
| 855 | return 1; |
| 856 | } |
| 857 | |
| 858 | static int mime_hdr_cmp(const MIME_HEADER * const *a, |
| 859 | const MIME_HEADER * const *b) |
| 860 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 861 | return(strcmp((*a)->name, (*b)->name)); |
| 862 | } |
| 863 | |
| 864 | static int mime_param_cmp(const MIME_PARAM * const *a, |
| 865 | const MIME_PARAM * const *b) |
| 866 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 867 | return(strcmp((*a)->param_name, (*b)->param_name)); |
| 868 | } |
| 869 | |
| 870 | /* Find a header with a given name (if possible) */ |
| 871 | |
| 872 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) |
| 873 | { |
| 874 | MIME_HEADER htmp; |
| 875 | int idx; |
| 876 | htmp.name = name; |
| 877 | idx = sk_MIME_HEADER_find(hdrs, &htmp); |
| 878 | if(idx < 0) return NULL; |
| 879 | return sk_MIME_HEADER_value(hdrs, idx); |
| 880 | } |
| 881 | |
| 882 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) |
| 883 | { |
| 884 | MIME_PARAM param; |
| 885 | int idx; |
| 886 | param.param_name = name; |
| 887 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); |
| 888 | if(idx < 0) return NULL; |
| 889 | return sk_MIME_PARAM_value(hdr->params, idx); |
| 890 | } |
| 891 | |
| 892 | static void mime_hdr_free(MIME_HEADER *hdr) |
| 893 | { |
| 894 | if(hdr->name) OPENSSL_free(hdr->name); |
| 895 | if(hdr->value) OPENSSL_free(hdr->value); |
| 896 | if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); |
| 897 | OPENSSL_free(hdr); |
| 898 | } |
| 899 | |
| 900 | static void mime_param_free(MIME_PARAM *param) |
| 901 | { |
| 902 | if(param->param_name) OPENSSL_free(param->param_name); |
| 903 | if(param->param_value) OPENSSL_free(param->param_value); |
| 904 | OPENSSL_free(param); |
| 905 | } |
| 906 | |
| 907 | /* Check for a multipart boundary. Returns: |
| 908 | * 0 : no boundary |
| 909 | * 1 : part boundary |
| 910 | * 2 : final boundary |
| 911 | */ |
| 912 | static int mime_bound_check(char *line, int linelen, char *bound, int blen) |
| 913 | { |
| 914 | if(linelen == -1) linelen = strlen(line); |
| 915 | if(blen == -1) blen = strlen(bound); |
| 916 | /* Quickly eliminate if line length too short */ |
| 917 | if(blen + 2 > linelen) return 0; |
| 918 | /* Check for part boundary */ |
| 919 | if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { |
| 920 | if(!strncmp(line + blen + 2, "--", 2)) return 2; |
| 921 | else return 1; |
| 922 | } |
| 923 | return 0; |
| 924 | } |
| 925 | |
| 926 | static int strip_eol(char *linebuf, int *plen) |
| 927 | { |
| 928 | int len = *plen; |
| 929 | char *p, c; |
| 930 | int is_eol = 0; |
| 931 | p = linebuf + len - 1; |
| 932 | for (p = linebuf + len - 1; len > 0; len--, p--) |
| 933 | { |
| 934 | c = *p; |
| 935 | if (c == '\n') |
| 936 | is_eol = 1; |
| 937 | else if (c != '\r') |
| 938 | break; |
| 939 | } |
| 940 | *plen = len; |
| 941 | return is_eol; |
| 942 | } |