1 /* $OpenBSD: asn1pars.c,v 1.16 2023/07/23 11:39:29 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 /* A nice addition from Dr Stephen Henson <steve@openssl.org> to 60 * add the -strparse option which parses nested binary structures 61 */ 62 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <limits.h> 66 #include <string.h> 67 68 #include "apps.h" 69 #include "progs.h" 70 71 #include <openssl/err.h> 72 #include <openssl/evp.h> 73 #include <openssl/pem.h> 74 #include <openssl/x509.h> 75 76 static struct { 77 char *derfile; 78 int dump; 79 char *genconf; 80 char *genstr; 81 int indent; 82 char *infile; 83 int informat; 84 unsigned int length; 85 int noout; 86 int offset; 87 char *oidfile; 88 STACK_OF(OPENSSL_STRING) *osk; 89 } cfg; 90 91 static int 92 asn1pars_opt_dlimit(char *arg) 93 { 94 const char *errstr; 95 96 cfg.dump = strtonum(arg, 1, INT_MAX, &errstr); 97 if (errstr) { 98 fprintf(stderr, "-dlimit must be from 1 to INT_MAX: %s\n", 99 errstr); 100 return (-1); 101 } 102 return (0); 103 } 104 105 static int 106 asn1pars_opt_length(char *arg) 107 { 108 const char *errstr; 109 110 cfg.length = strtonum(arg, 1, UINT_MAX, &errstr); 111 if (errstr) { 112 fprintf(stderr, "-length must be from 1 to UINT_MAX: %s\n", 113 errstr); 114 return (-1); 115 } 116 return (0); 117 } 118 119 static int 120 asn1pars_opt_strparse(char *arg) 121 { 122 if (sk_OPENSSL_STRING_push(cfg.osk, arg) == 0) { 123 fprintf(stderr, "-strparse cannot add argument\n"); 124 return (-1); 125 } 126 return (0); 127 } 128 129 static const struct option asn1pars_options[] = { 130 { 131 .name = "dump", 132 .desc = "Dump unknown data in hex form", 133 .type = OPTION_VALUE, 134 .value = -1, 135 .opt.value = &cfg.dump, 136 }, 137 { 138 .name = "dlimit", 139 .argname = "num", 140 .desc = "Dump the first num bytes of unknown data in hex form", 141 .type = OPTION_ARG_FUNC, 142 .opt.argfunc = asn1pars_opt_dlimit, 143 }, 144 { 145 .name = "genconf", 146 .argname = "file", 147 .desc = "File to generate ASN.1 structure from", 148 .type = OPTION_ARG, 149 .opt.arg = &cfg.genconf, 150 }, 151 { 152 .name = "genstr", 153 .argname = "string", 154 .desc = "String to generate ASN.1 structure from", 155 .type = OPTION_ARG, 156 .opt.arg = &cfg.genstr, 157 }, 158 { 159 .name = "i", 160 .desc = "Indent output according to depth of structures", 161 .type = OPTION_FLAG, 162 .opt.flag = &cfg.indent, 163 }, 164 { 165 .name = "in", 166 .argname = "file", 167 .desc = "The input file (default stdin)", 168 .type = OPTION_ARG, 169 .opt.arg = &cfg.infile, 170 }, 171 { 172 .name = "inform", 173 .argname = "fmt", 174 .desc = "Input format (DER, TXT or PEM (default))", 175 .type = OPTION_ARG_FORMAT, 176 .opt.value = &cfg.informat, 177 }, 178 { 179 .name = "length", 180 .argname = "num", 181 .desc = "Number of bytes to parse (default until EOF)", 182 .type = OPTION_ARG_FUNC, 183 .opt.argfunc = asn1pars_opt_length, 184 }, 185 { 186 .name = "noout", 187 .desc = "Do not produce any output", 188 .type = OPTION_FLAG, 189 .opt.flag = &cfg.noout, 190 }, 191 { 192 .name = "offset", 193 .argname = "num", 194 .desc = "Offset to begin parsing", 195 .type = OPTION_ARG_INT, 196 .opt.value = &cfg.offset, 197 }, 198 { 199 .name = "oid", 200 .argname = "file", 201 .desc = "File containing additional object identifiers (OIDs)", 202 .type = OPTION_ARG, 203 .opt.arg = &cfg.oidfile, 204 }, 205 { 206 .name = "out", 207 .argname = "file", 208 .desc = "Output file in DER format", 209 .type = OPTION_ARG, 210 .opt.arg = &cfg.derfile, 211 }, 212 { 213 .name = "strparse", 214 .argname = "offset", 215 .desc = "Parse the content octets of ASN.1 object starting at" 216 " offset", 217 .type = OPTION_ARG_FUNC, 218 .opt.argfunc = asn1pars_opt_strparse, 219 }, 220 { NULL }, 221 }; 222 223 static void 224 asn1pars_usage(void) 225 { 226 fprintf(stderr, 227 "usage: asn1parse [-i] [-dlimit num] [-dump] [-genconf file] " 228 "[-genstr string]\n" 229 " [-in file] [-inform fmt] [-length num] [-noout] [-offset num] " 230 "[-oid file]\n" 231 " [-out file] [-strparse offset]\n\n"); 232 options_usage(asn1pars_options); 233 } 234 235 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf); 236 237 int 238 asn1parse_main(int argc, char **argv) 239 { 240 int i, j, ret = 1; 241 long num, tmplen; 242 BIO *in = NULL, *out = NULL, *b64 = NULL, *derout = NULL; 243 char *str = NULL; 244 const char *errstr = NULL; 245 unsigned char *tmpbuf; 246 const unsigned char *ctmpbuf; 247 BUF_MEM *buf = NULL; 248 ASN1_TYPE *at = NULL; 249 250 if (pledge("stdio cpath wpath rpath", NULL) == -1) { 251 perror("pledge"); 252 exit(1); 253 } 254 255 memset(&cfg, 0, sizeof(cfg)); 256 257 cfg.informat = FORMAT_PEM; 258 if ((cfg.osk = sk_OPENSSL_STRING_new_null()) == NULL) { 259 BIO_printf(bio_err, "Memory allocation failure\n"); 260 goto end; 261 } 262 263 if (options_parse(argc, argv, asn1pars_options, NULL, NULL) != 0) { 264 asn1pars_usage(); 265 return (1); 266 } 267 268 in = BIO_new(BIO_s_file()); 269 out = BIO_new(BIO_s_file()); 270 if (in == NULL || out == NULL) { 271 ERR_print_errors(bio_err); 272 goto end; 273 } 274 BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT); 275 276 if (cfg.oidfile != NULL) { 277 if (BIO_read_filename(in, cfg.oidfile) <= 0) { 278 BIO_printf(bio_err, "problems opening %s\n", 279 cfg.oidfile); 280 ERR_print_errors(bio_err); 281 goto end; 282 } 283 OBJ_create_objects(in); 284 } 285 if (cfg.infile == NULL) 286 BIO_set_fp(in, stdin, BIO_NOCLOSE); 287 else { 288 if (BIO_read_filename(in, cfg.infile) <= 0) { 289 perror(cfg.infile); 290 goto end; 291 } 292 } 293 294 if (cfg.derfile != NULL) { 295 if ((derout = BIO_new_file(cfg.derfile, "wb")) == NULL) { 296 BIO_printf(bio_err, "problems opening %s\n", 297 cfg.derfile); 298 ERR_print_errors(bio_err); 299 goto end; 300 } 301 } 302 if ((buf = BUF_MEM_new()) == NULL) 303 goto end; 304 if (!BUF_MEM_grow(buf, BUFSIZ * 8)) 305 goto end; 306 307 if (cfg.genstr != NULL || cfg.genconf) { 308 num = do_generate(bio_err, cfg.genstr, cfg.genconf, buf); 309 if (num < 0) { 310 ERR_print_errors(bio_err); 311 goto end; 312 } 313 } else { 314 if (cfg.informat == FORMAT_PEM) { 315 BIO *tmp; 316 317 if ((b64 = BIO_new(BIO_f_base64())) == NULL) 318 goto end; 319 BIO_push(b64, in); 320 tmp = in; 321 in = b64; 322 b64 = tmp; 323 } 324 num = 0; 325 for (;;) { 326 if (!BUF_MEM_grow(buf, (int) num + BUFSIZ)) 327 goto end; 328 i = BIO_read(in, &(buf->data[num]), BUFSIZ); 329 if (i <= 0) 330 break; 331 num += i; 332 } 333 } 334 str = buf->data; 335 336 /* If any structs to parse go through in sequence */ 337 338 if (sk_OPENSSL_STRING_num(cfg.osk) > 0) { 339 tmpbuf = (unsigned char *) str; 340 tmplen = num; 341 for (i = 0; i < sk_OPENSSL_STRING_num(cfg.osk); i++) { 342 ASN1_TYPE *atmp; 343 int typ; 344 j = strtonum(sk_OPENSSL_STRING_value(cfg.osk, i), 345 1, INT_MAX, &errstr); 346 if (errstr) { 347 BIO_printf(bio_err, 348 "'%s' is an invalid number: %s\n", 349 sk_OPENSSL_STRING_value(cfg.osk, i), errstr); 350 continue; 351 } 352 tmpbuf += j; 353 tmplen -= j; 354 atmp = at; 355 ctmpbuf = tmpbuf; 356 at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen); 357 ASN1_TYPE_free(atmp); 358 if (!at) { 359 BIO_printf(bio_err, "Error parsing structure\n"); 360 ERR_print_errors(bio_err); 361 goto end; 362 } 363 typ = ASN1_TYPE_get(at); 364 if (typ == V_ASN1_BOOLEAN || typ == V_ASN1_NULL || 365 typ == V_ASN1_OBJECT) { 366 BIO_printf(bio_err, "Can't parse %s type\n", 367 ASN1_tag2str(typ)); 368 ERR_print_errors(bio_err); 369 goto end; 370 } 371 /* hmm... this is a little evil but it works */ 372 tmpbuf = at->value.asn1_string->data; 373 tmplen = at->value.asn1_string->length; 374 } 375 str = (char *) tmpbuf; 376 num = tmplen; 377 } 378 if (cfg.offset >= num) { 379 BIO_printf(bio_err, "Error: offset too large\n"); 380 goto end; 381 } 382 num -= cfg.offset; 383 384 if (cfg.length == 0 || (long)cfg.length > num) 385 cfg.length = (unsigned int) num; 386 if (derout != NULL) { 387 if (BIO_write(derout, str + cfg.offset, 388 cfg.length) != (int)cfg.length) { 389 BIO_printf(bio_err, "Error writing output\n"); 390 ERR_print_errors(bio_err); 391 goto end; 392 } 393 } 394 if (!cfg.noout && !ASN1_parse_dump(out, 395 (unsigned char *)&str[cfg.offset], cfg.length, cfg.indent, cfg.dump)) { 396 ERR_print_errors(bio_err); 397 goto end; 398 } 399 ret = 0; 400 end: 401 BIO_free(derout); 402 BIO_free(in); 403 BIO_free_all(out); 404 BIO_free(b64); 405 if (ret != 0) 406 ERR_print_errors(bio_err); 407 BUF_MEM_free(buf); 408 ASN1_TYPE_free(at); 409 sk_OPENSSL_STRING_free(cfg.osk); 410 OBJ_cleanup(); 411 412 return (ret); 413 } 414 415 static int 416 do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf) 417 { 418 CONF *cnf = NULL; 419 int len; 420 long errline; 421 unsigned char *p; 422 ASN1_TYPE *atyp = NULL; 423 424 if (genconf) { 425 cnf = NCONF_new(NULL); 426 if (!NCONF_load(cnf, genconf, &errline)) 427 goto conferr; 428 if (!genstr) 429 genstr = NCONF_get_string(cnf, "default", "asn1"); 430 if (!genstr) { 431 BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf); 432 goto err; 433 } 434 } 435 atyp = ASN1_generate_nconf(genstr, cnf); 436 NCONF_free(cnf); 437 cnf = NULL; 438 439 if (!atyp) 440 return -1; 441 442 len = i2d_ASN1_TYPE(atyp, NULL); 443 if (len <= 0) 444 goto err; 445 446 if (!BUF_MEM_grow(buf, len)) 447 goto err; 448 449 p = (unsigned char *) buf->data; 450 451 i2d_ASN1_TYPE(atyp, &p); 452 453 ASN1_TYPE_free(atyp); 454 return len; 455 456 conferr: 457 458 if (errline > 0) 459 BIO_printf(bio, "Error on line %ld of config file '%s'\n", 460 errline, genconf); 461 else 462 BIO_printf(bio, "Error loading config file '%s'\n", genconf); 463 464 err: 465 NCONF_free(cnf); 466 ASN1_TYPE_free(atyp); 467 468 return -1; 469 470 } 471