1 /* $OpenBSD: asn1pars.c,v 1.17 2025/01/02 12:31:44 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 70 #include <openssl/err.h> 71 #include <openssl/evp.h> 72 #include <openssl/pem.h> 73 #include <openssl/x509.h> 74 75 static struct { 76 char *derfile; 77 int dump; 78 char *genconf; 79 char *genstr; 80 int indent; 81 char *infile; 82 int informat; 83 unsigned int length; 84 int noout; 85 int offset; 86 char *oidfile; 87 STACK_OF(OPENSSL_STRING) *osk; 88 } cfg; 89 90 static int 91 asn1pars_opt_dlimit(char *arg) 92 { 93 const char *errstr; 94 95 cfg.dump = strtonum(arg, 1, INT_MAX, &errstr); 96 if (errstr) { 97 fprintf(stderr, "-dlimit must be from 1 to INT_MAX: %s\n", 98 errstr); 99 return (-1); 100 } 101 return (0); 102 } 103 104 static int 105 asn1pars_opt_length(char *arg) 106 { 107 const char *errstr; 108 109 cfg.length = strtonum(arg, 1, UINT_MAX, &errstr); 110 if (errstr) { 111 fprintf(stderr, "-length must be from 1 to UINT_MAX: %s\n", 112 errstr); 113 return (-1); 114 } 115 return (0); 116 } 117 118 static int 119 asn1pars_opt_strparse(char *arg) 120 { 121 if (sk_OPENSSL_STRING_push(cfg.osk, arg) == 0) { 122 fprintf(stderr, "-strparse cannot add argument\n"); 123 return (-1); 124 } 125 return (0); 126 } 127 128 static const struct option asn1pars_options[] = { 129 { 130 .name = "dump", 131 .desc = "Dump unknown data in hex form", 132 .type = OPTION_VALUE, 133 .value = -1, 134 .opt.value = &cfg.dump, 135 }, 136 { 137 .name = "dlimit", 138 .argname = "num", 139 .desc = "Dump the first num bytes of unknown data in hex form", 140 .type = OPTION_ARG_FUNC, 141 .opt.argfunc = asn1pars_opt_dlimit, 142 }, 143 { 144 .name = "genconf", 145 .argname = "file", 146 .desc = "File to generate ASN.1 structure from", 147 .type = OPTION_ARG, 148 .opt.arg = &cfg.genconf, 149 }, 150 { 151 .name = "genstr", 152 .argname = "string", 153 .desc = "String to generate ASN.1 structure from", 154 .type = OPTION_ARG, 155 .opt.arg = &cfg.genstr, 156 }, 157 { 158 .name = "i", 159 .desc = "Indent output according to depth of structures", 160 .type = OPTION_FLAG, 161 .opt.flag = &cfg.indent, 162 }, 163 { 164 .name = "in", 165 .argname = "file", 166 .desc = "The input file (default stdin)", 167 .type = OPTION_ARG, 168 .opt.arg = &cfg.infile, 169 }, 170 { 171 .name = "inform", 172 .argname = "fmt", 173 .desc = "Input format (DER, TXT or PEM (default))", 174 .type = OPTION_ARG_FORMAT, 175 .opt.value = &cfg.informat, 176 }, 177 { 178 .name = "length", 179 .argname = "num", 180 .desc = "Number of bytes to parse (default until EOF)", 181 .type = OPTION_ARG_FUNC, 182 .opt.argfunc = asn1pars_opt_length, 183 }, 184 { 185 .name = "noout", 186 .desc = "Do not produce any output", 187 .type = OPTION_FLAG, 188 .opt.flag = &cfg.noout, 189 }, 190 { 191 .name = "offset", 192 .argname = "num", 193 .desc = "Offset to begin parsing", 194 .type = OPTION_ARG_INT, 195 .opt.value = &cfg.offset, 196 }, 197 { 198 .name = "oid", 199 .argname = "file", 200 .desc = "File containing additional object identifiers (OIDs)", 201 .type = OPTION_ARG, 202 .opt.arg = &cfg.oidfile, 203 }, 204 { 205 .name = "out", 206 .argname = "file", 207 .desc = "Output file in DER format", 208 .type = OPTION_ARG, 209 .opt.arg = &cfg.derfile, 210 }, 211 { 212 .name = "strparse", 213 .argname = "offset", 214 .desc = "Parse the content octets of ASN.1 object starting at" 215 " offset", 216 .type = OPTION_ARG_FUNC, 217 .opt.argfunc = asn1pars_opt_strparse, 218 }, 219 { NULL }, 220 }; 221 222 static void 223 asn1pars_usage(void) 224 { 225 fprintf(stderr, 226 "usage: asn1parse [-i] [-dlimit num] [-dump] [-genconf file] " 227 "[-genstr string]\n" 228 " [-in file] [-inform fmt] [-length num] [-noout] [-offset num] " 229 "[-oid file]\n" 230 " [-out file] [-strparse offset]\n\n"); 231 options_usage(asn1pars_options); 232 } 233 234 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf); 235 236 int 237 asn1parse_main(int argc, char **argv) 238 { 239 int i, j, ret = 1; 240 long num, tmplen; 241 BIO *in = NULL, *out = NULL, *b64 = NULL, *derout = NULL; 242 char *str = NULL; 243 const char *errstr = NULL; 244 unsigned char *tmpbuf; 245 const unsigned char *ctmpbuf; 246 BUF_MEM *buf = NULL; 247 ASN1_TYPE *at = NULL; 248 249 if (pledge("stdio cpath wpath rpath", NULL) == -1) { 250 perror("pledge"); 251 exit(1); 252 } 253 254 memset(&cfg, 0, sizeof(cfg)); 255 256 cfg.informat = FORMAT_PEM; 257 if ((cfg.osk = sk_OPENSSL_STRING_new_null()) == NULL) { 258 BIO_printf(bio_err, "Memory allocation failure\n"); 259 goto end; 260 } 261 262 if (options_parse(argc, argv, asn1pars_options, NULL, NULL) != 0) { 263 asn1pars_usage(); 264 return (1); 265 } 266 267 in = BIO_new(BIO_s_file()); 268 out = BIO_new(BIO_s_file()); 269 if (in == NULL || out == NULL) { 270 ERR_print_errors(bio_err); 271 goto end; 272 } 273 BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT); 274 275 if (cfg.oidfile != NULL) { 276 if (BIO_read_filename(in, cfg.oidfile) <= 0) { 277 BIO_printf(bio_err, "problems opening %s\n", 278 cfg.oidfile); 279 ERR_print_errors(bio_err); 280 goto end; 281 } 282 OBJ_create_objects(in); 283 } 284 if (cfg.infile == NULL) 285 BIO_set_fp(in, stdin, BIO_NOCLOSE); 286 else { 287 if (BIO_read_filename(in, cfg.infile) <= 0) { 288 perror(cfg.infile); 289 goto end; 290 } 291 } 292 293 if (cfg.derfile != NULL) { 294 if ((derout = BIO_new_file(cfg.derfile, "wb")) == NULL) { 295 BIO_printf(bio_err, "problems opening %s\n", 296 cfg.derfile); 297 ERR_print_errors(bio_err); 298 goto end; 299 } 300 } 301 if ((buf = BUF_MEM_new()) == NULL) 302 goto end; 303 if (!BUF_MEM_grow(buf, BUFSIZ * 8)) 304 goto end; 305 306 if (cfg.genstr != NULL || cfg.genconf) { 307 num = do_generate(bio_err, cfg.genstr, cfg.genconf, buf); 308 if (num < 0) { 309 ERR_print_errors(bio_err); 310 goto end; 311 } 312 } else { 313 if (cfg.informat == FORMAT_PEM) { 314 BIO *tmp; 315 316 if ((b64 = BIO_new(BIO_f_base64())) == NULL) 317 goto end; 318 BIO_push(b64, in); 319 tmp = in; 320 in = b64; 321 b64 = tmp; 322 } 323 num = 0; 324 for (;;) { 325 if (!BUF_MEM_grow(buf, (int) num + BUFSIZ)) 326 goto end; 327 i = BIO_read(in, &(buf->data[num]), BUFSIZ); 328 if (i <= 0) 329 break; 330 num += i; 331 } 332 } 333 str = buf->data; 334 335 /* If any structs to parse go through in sequence */ 336 337 if (sk_OPENSSL_STRING_num(cfg.osk) > 0) { 338 tmpbuf = (unsigned char *) str; 339 tmplen = num; 340 for (i = 0; i < sk_OPENSSL_STRING_num(cfg.osk); i++) { 341 ASN1_TYPE *atmp; 342 int typ; 343 j = strtonum(sk_OPENSSL_STRING_value(cfg.osk, i), 344 1, INT_MAX, &errstr); 345 if (errstr) { 346 BIO_printf(bio_err, 347 "'%s' is an invalid number: %s\n", 348 sk_OPENSSL_STRING_value(cfg.osk, i), errstr); 349 continue; 350 } 351 tmpbuf += j; 352 tmplen -= j; 353 atmp = at; 354 ctmpbuf = tmpbuf; 355 at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen); 356 ASN1_TYPE_free(atmp); 357 if (!at) { 358 BIO_printf(bio_err, "Error parsing structure\n"); 359 ERR_print_errors(bio_err); 360 goto end; 361 } 362 typ = ASN1_TYPE_get(at); 363 if (typ == V_ASN1_BOOLEAN || typ == V_ASN1_NULL || 364 typ == V_ASN1_OBJECT) { 365 BIO_printf(bio_err, "Can't parse %s type\n", 366 ASN1_tag2str(typ)); 367 ERR_print_errors(bio_err); 368 goto end; 369 } 370 /* hmm... this is a little evil but it works */ 371 tmpbuf = at->value.asn1_string->data; 372 tmplen = at->value.asn1_string->length; 373 } 374 str = (char *) tmpbuf; 375 num = tmplen; 376 } 377 if (cfg.offset >= num) { 378 BIO_printf(bio_err, "Error: offset too large\n"); 379 goto end; 380 } 381 num -= cfg.offset; 382 383 if (cfg.length == 0 || (long)cfg.length > num) 384 cfg.length = (unsigned int) num; 385 if (derout != NULL) { 386 if (BIO_write(derout, str + cfg.offset, 387 cfg.length) != (int)cfg.length) { 388 BIO_printf(bio_err, "Error writing output\n"); 389 ERR_print_errors(bio_err); 390 goto end; 391 } 392 } 393 if (!cfg.noout && !ASN1_parse_dump(out, 394 (unsigned char *)&str[cfg.offset], cfg.length, cfg.indent, cfg.dump)) { 395 ERR_print_errors(bio_err); 396 goto end; 397 } 398 ret = 0; 399 end: 400 BIO_free(derout); 401 BIO_free(in); 402 BIO_free_all(out); 403 BIO_free(b64); 404 if (ret != 0) 405 ERR_print_errors(bio_err); 406 BUF_MEM_free(buf); 407 ASN1_TYPE_free(at); 408 sk_OPENSSL_STRING_free(cfg.osk); 409 OBJ_cleanup(); 410 411 return (ret); 412 } 413 414 static int 415 do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf) 416 { 417 CONF *cnf = NULL; 418 int len; 419 long errline; 420 unsigned char *p; 421 ASN1_TYPE *atyp = NULL; 422 423 if (genconf) { 424 cnf = NCONF_new(NULL); 425 if (!NCONF_load(cnf, genconf, &errline)) 426 goto conferr; 427 if (!genstr) 428 genstr = NCONF_get_string(cnf, "default", "asn1"); 429 if (!genstr) { 430 BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf); 431 goto err; 432 } 433 } 434 atyp = ASN1_generate_nconf(genstr, cnf); 435 NCONF_free(cnf); 436 cnf = NULL; 437 438 if (!atyp) 439 return -1; 440 441 len = i2d_ASN1_TYPE(atyp, NULL); 442 if (len <= 0) 443 goto err; 444 445 if (!BUF_MEM_grow(buf, len)) 446 goto err; 447 448 p = (unsigned char *) buf->data; 449 450 i2d_ASN1_TYPE(atyp, &p); 451 452 ASN1_TYPE_free(atyp); 453 return len; 454 455 conferr: 456 457 if (errline > 0) 458 BIO_printf(bio, "Error on line %ld of config file '%s'\n", 459 errline, genconf); 460 else 461 BIO_printf(bio, "Error loading config file '%s'\n", genconf); 462 463 err: 464 NCONF_free(cnf); 465 ASN1_TYPE_free(atyp); 466 467 return -1; 468 469 } 470