1 /* 2 * Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <stdio.h> 11 #include <stdlib.h> 12 #include <string.h> 13 #include "apps.h" 14 #include "progs.h" 15 #include <openssl/err.h> 16 #include <openssl/evp.h> 17 #include <openssl/x509.h> 18 #include <openssl/pem.h> 19 #include <openssl/asn1t.h> 20 21 typedef enum OPTION_choice { 22 OPT_COMMON, 23 OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT, 24 OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT, 25 OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM, 26 OPT_ITEM 27 } OPTION_CHOICE; 28 29 const OPTIONS asn1parse_options[] = { 30 OPT_SECTION("General"), 31 {"help", OPT_HELP, '-', "Display this summary"}, 32 {"oid", OPT_OID, '<', "file of extra oid definitions"}, 33 34 OPT_SECTION("I/O"), 35 {"inform", OPT_INFORM, 'F', "input format - one of DER PEM"}, 36 {"in", OPT_IN, '<', "input file"}, 37 {"out", OPT_OUT, '>', "output file (output format is always DER)"}, 38 {"noout", OPT_NOOUT, 0, "do not produce any output"}, 39 {"offset", OPT_OFFSET, 'p', "offset into file"}, 40 {"length", OPT_LENGTH, 'p', "length of section in file"}, 41 {"strparse", OPT_STRPARSE, 'p', 42 "offset; a series of these can be used to 'dig'"}, 43 {"genstr", OPT_GENSTR, 's', "string to generate ASN1 structure from"}, 44 {OPT_MORE_STR, 0, 0, "into multiple ASN1 blob wrappings"}, 45 {"genconf", OPT_GENCONF, 's', "file to generate ASN1 structure from"}, 46 {"strictpem", OPT_STRICTPEM, 0, 47 "do not attempt base64 decode outside PEM markers"}, 48 {"item", OPT_ITEM, 's', "item to parse and print"}, 49 {OPT_MORE_STR, 0, 0, "(-inform will be ignored)"}, 50 51 OPT_SECTION("Formatting"), 52 {"i", OPT_INDENT, 0, "indents the output"}, 53 {"dump", OPT_DUMP, 0, "unknown data in hex form"}, 54 {"dlimit", OPT_DLIMIT, 'p', 55 "dump the first arg bytes of unknown data in hex form"}, 56 {NULL} 57 }; 58 59 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf); 60 61 int asn1parse_main(int argc, char **argv) 62 { 63 ASN1_TYPE *at = NULL; 64 BIO *in = NULL, *b64 = NULL, *derout = NULL; 65 BUF_MEM *buf = NULL; 66 STACK_OF(OPENSSL_STRING) *osk = NULL; 67 char *genstr = NULL, *genconf = NULL; 68 char *infile = NULL, *oidfile = NULL, *derfile = NULL; 69 unsigned char *str = NULL; 70 char *name = NULL, *header = NULL, *prog; 71 const unsigned char *ctmpbuf; 72 int indent = 0, noout = 0, dump = 0, strictpem = 0, informat = FORMAT_PEM; 73 int offset = 0, ret = 1, i, j; 74 long num, tmplen; 75 unsigned char *tmpbuf; 76 unsigned int length = 0; 77 OPTION_CHOICE o; 78 const ASN1_ITEM *it = NULL; 79 80 prog = opt_init(argc, argv, asn1parse_options); 81 82 if ((osk = sk_OPENSSL_STRING_new_null()) == NULL) { 83 BIO_printf(bio_err, "%s: Memory allocation failure\n", prog); 84 goto end; 85 } 86 87 while ((o = opt_next()) != OPT_EOF) { 88 switch (o) { 89 case OPT_EOF: 90 case OPT_ERR: 91 opthelp: 92 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); 93 goto end; 94 case OPT_HELP: 95 opt_help(asn1parse_options); 96 ret = 0; 97 goto end; 98 case OPT_INFORM: 99 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat)) 100 goto opthelp; 101 break; 102 case OPT_IN: 103 infile = opt_arg(); 104 break; 105 case OPT_OUT: 106 derfile = opt_arg(); 107 break; 108 case OPT_INDENT: 109 indent = 1; 110 break; 111 case OPT_NOOUT: 112 noout = 1; 113 break; 114 case OPT_OID: 115 oidfile = opt_arg(); 116 break; 117 case OPT_OFFSET: 118 offset = strtol(opt_arg(), NULL, 0); 119 break; 120 case OPT_LENGTH: 121 length = strtol(opt_arg(), NULL, 0); 122 break; 123 case OPT_DUMP: 124 dump = -1; 125 break; 126 case OPT_DLIMIT: 127 dump = strtol(opt_arg(), NULL, 0); 128 break; 129 case OPT_STRPARSE: 130 if (sk_OPENSSL_STRING_push(osk, opt_arg()) <= 0) 131 goto end; 132 break; 133 case OPT_GENSTR: 134 genstr = opt_arg(); 135 break; 136 case OPT_GENCONF: 137 genconf = opt_arg(); 138 break; 139 case OPT_STRICTPEM: 140 strictpem = 1; 141 informat = FORMAT_PEM; 142 break; 143 case OPT_ITEM: 144 it = ASN1_ITEM_lookup(opt_arg()); 145 if (it == NULL) { 146 size_t tmp; 147 148 BIO_printf(bio_err, "Unknown item name %s\n", opt_arg()); 149 BIO_puts(bio_err, "Supported types:\n"); 150 for (tmp = 0;; tmp++) { 151 it = ASN1_ITEM_get(tmp); 152 if (it == NULL) 153 break; 154 BIO_printf(bio_err, " %s\n", it->sname); 155 } 156 goto end; 157 } 158 break; 159 } 160 } 161 162 /* No extra args. */ 163 argc = opt_num_rest(); 164 if (argc != 0) 165 goto opthelp; 166 167 if (oidfile != NULL) { 168 in = bio_open_default(oidfile, 'r', FORMAT_TEXT); 169 if (in == NULL) 170 goto end; 171 OBJ_create_objects(in); 172 BIO_free(in); 173 } 174 175 if ((in = bio_open_default(infile, 'r', informat)) == NULL) 176 goto end; 177 178 if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL) 179 goto end; 180 181 if ((buf = BUF_MEM_new()) == NULL) 182 goto end; 183 if (strictpem) { 184 if (PEM_read_bio(in, &name, &header, &str, &num) != 1) { 185 BIO_printf(bio_err, "Error reading PEM file\n"); 186 ERR_print_errors(bio_err); 187 goto end; 188 } 189 buf->data = (char *)str; 190 buf->length = buf->max = num; 191 } else { 192 if (!BUF_MEM_grow(buf, BUFSIZ * 8)) 193 goto end; /* Pre-allocate :-) */ 194 195 if (genstr || genconf) { 196 num = do_generate(genstr, genconf, buf); 197 if (num < 0) { 198 ERR_print_errors(bio_err); 199 goto end; 200 } 201 } else { 202 203 if (informat == FORMAT_PEM) { 204 BIO *tmp; 205 206 if ((b64 = BIO_new(BIO_f_base64())) == NULL) 207 goto end; 208 BIO_push(b64, in); 209 tmp = in; 210 in = b64; 211 b64 = tmp; 212 } 213 214 num = 0; 215 for (;;) { 216 if (!BUF_MEM_grow(buf, num + BUFSIZ)) 217 goto end; 218 i = BIO_read(in, &(buf->data[num]), BUFSIZ); 219 if (i <= 0) 220 break; 221 num += i; 222 } 223 } 224 str = (unsigned char *)buf->data; 225 226 } 227 228 /* If any structs to parse go through in sequence */ 229 230 if (sk_OPENSSL_STRING_num(osk)) { 231 tmpbuf = str; 232 tmplen = num; 233 for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) { 234 ASN1_TYPE *atmp; 235 int typ; 236 j = strtol(sk_OPENSSL_STRING_value(osk, i), NULL, 0); 237 if (j <= 0 || j >= tmplen) { 238 BIO_printf(bio_err, "'%s' is out of range\n", 239 sk_OPENSSL_STRING_value(osk, i)); 240 continue; 241 } 242 tmpbuf += j; 243 tmplen -= j; 244 atmp = at; 245 ctmpbuf = tmpbuf; 246 at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen); 247 ASN1_TYPE_free(atmp); 248 if (!at) { 249 BIO_printf(bio_err, "Error parsing structure\n"); 250 ERR_print_errors(bio_err); 251 goto end; 252 } 253 typ = ASN1_TYPE_get(at); 254 if ((typ == V_ASN1_OBJECT) 255 || (typ == V_ASN1_BOOLEAN) 256 || (typ == V_ASN1_NULL)) { 257 BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ)); 258 ERR_print_errors(bio_err); 259 goto end; 260 } 261 /* hmm... this is a little evil but it works */ 262 tmpbuf = at->value.asn1_string->data; 263 tmplen = at->value.asn1_string->length; 264 } 265 str = tmpbuf; 266 num = tmplen; 267 } 268 269 if (offset < 0 || offset >= num) { 270 BIO_printf(bio_err, "Error: offset out of range\n"); 271 goto end; 272 } 273 274 num -= offset; 275 276 if (length == 0 || length > (unsigned int)num) 277 length = (unsigned int)num; 278 if (derout != NULL) { 279 if (BIO_write(derout, str + offset, length) != (int)length) { 280 BIO_printf(bio_err, "Error writing output\n"); 281 ERR_print_errors(bio_err); 282 goto end; 283 } 284 } 285 if (!noout) { 286 const unsigned char *p = str + offset; 287 288 if (it != NULL) { 289 ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it); 290 if (value == NULL) { 291 BIO_printf(bio_err, "Error parsing item %s\n", it->sname); 292 ERR_print_errors(bio_err); 293 goto end; 294 } 295 ASN1_item_print(bio_out, value, 0, it, NULL); 296 ASN1_item_free(value, it); 297 } else { 298 if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) { 299 ERR_print_errors(bio_err); 300 goto end; 301 } 302 } 303 } 304 ret = 0; 305 end: 306 BIO_free(derout); 307 BIO_free(in); 308 BIO_free(b64); 309 if (ret != 0) 310 ERR_print_errors(bio_err); 311 BUF_MEM_free(buf); 312 OPENSSL_free(name); 313 OPENSSL_free(header); 314 ASN1_TYPE_free(at); 315 sk_OPENSSL_STRING_free(osk); 316 return ret; 317 } 318 319 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf) 320 { 321 CONF *cnf = NULL; 322 int len; 323 unsigned char *p; 324 ASN1_TYPE *atyp = NULL; 325 326 if (genconf != NULL) { 327 if ((cnf = app_load_config(genconf)) == NULL) 328 goto err; 329 if (genstr == NULL) 330 genstr = NCONF_get_string(cnf, "default", "asn1"); 331 if (genstr == NULL) { 332 BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf); 333 goto err; 334 } 335 } 336 337 atyp = ASN1_generate_nconf(genstr, cnf); 338 NCONF_free(cnf); 339 cnf = NULL; 340 341 if (atyp == NULL) 342 return -1; 343 344 len = i2d_ASN1_TYPE(atyp, NULL); 345 346 if (len <= 0) 347 goto err; 348 349 if (!BUF_MEM_grow(buf, len)) 350 goto err; 351 352 p = (unsigned char *)buf->data; 353 354 i2d_ASN1_TYPE(atyp, &p); 355 356 ASN1_TYPE_free(atyp); 357 return len; 358 359 err: 360 NCONF_free(cnf); 361 ASN1_TYPE_free(atyp); 362 return -1; 363 } 364
Indexes created Tue Mar 03 05:31:39 UTC 2026