1 /* 2 * Copyright 1995-2021 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 sk_OPENSSL_STRING_push(osk, opt_arg()); 131 break; 132 case OPT_GENSTR: 133 genstr = opt_arg(); 134 break; 135 case OPT_GENCONF: 136 genconf = opt_arg(); 137 break; 138 case OPT_STRICTPEM: 139 strictpem = 1; 140 informat = FORMAT_PEM; 141 break; 142 case OPT_ITEM: 143 it = ASN1_ITEM_lookup(opt_arg()); 144 if (it == NULL) { 145 size_t tmp; 146 147 BIO_printf(bio_err, "Unknown item name %s\n", opt_arg()); 148 BIO_puts(bio_err, "Supported types:\n"); 149 for (tmp = 0;; tmp++) { 150 it = ASN1_ITEM_get(tmp); 151 if (it == NULL) 152 break; 153 BIO_printf(bio_err, " %s\n", it->sname); 154 } 155 goto end; 156 } 157 break; 158 } 159 } 160 161 /* No extra args. */ 162 argc = opt_num_rest(); 163 if (argc != 0) 164 goto opthelp; 165 166 if (oidfile != NULL) { 167 in = bio_open_default(oidfile, 'r', FORMAT_TEXT); 168 if (in == NULL) 169 goto end; 170 OBJ_create_objects(in); 171 BIO_free(in); 172 } 173 174 if ((in = bio_open_default(infile, 'r', informat)) == NULL) 175 goto end; 176 177 if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL) 178 goto end; 179 180 if ((buf = BUF_MEM_new()) == NULL) 181 goto end; 182 if (strictpem) { 183 if (PEM_read_bio(in, &name, &header, &str, &num) != 1) { 184 BIO_printf(bio_err, "Error reading PEM file\n"); 185 ERR_print_errors(bio_err); 186 goto end; 187 } 188 buf->data = (char *)str; 189 buf->length = buf->max = num; 190 } else { 191 if (!BUF_MEM_grow(buf, BUFSIZ * 8)) 192 goto end; /* Pre-allocate :-) */ 193 194 if (genstr || genconf) { 195 num = do_generate(genstr, genconf, buf); 196 if (num < 0) { 197 ERR_print_errors(bio_err); 198 goto end; 199 } 200 } else { 201 202 if (informat == FORMAT_PEM) { 203 BIO *tmp; 204 205 if ((b64 = BIO_new(BIO_f_base64())) == NULL) 206 goto end; 207 BIO_push(b64, in); 208 tmp = in; 209 in = b64; 210 b64 = tmp; 211 } 212 213 num = 0; 214 for (;;) { 215 if (!BUF_MEM_grow(buf, num + BUFSIZ)) 216 goto end; 217 i = BIO_read(in, &(buf->data[num]), BUFSIZ); 218 if (i <= 0) 219 break; 220 num += i; 221 } 222 } 223 str = (unsigned char *)buf->data; 224 225 } 226 227 /* If any structs to parse go through in sequence */ 228 229 if (sk_OPENSSL_STRING_num(osk)) { 230 tmpbuf = str; 231 tmplen = num; 232 for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) { 233 ASN1_TYPE *atmp; 234 int typ; 235 j = strtol(sk_OPENSSL_STRING_value(osk, i), NULL, 0); 236 if (j <= 0 || j >= tmplen) { 237 BIO_printf(bio_err, "'%s' is out of range\n", 238 sk_OPENSSL_STRING_value(osk, i)); 239 continue; 240 } 241 tmpbuf += j; 242 tmplen -= j; 243 atmp = at; 244 ctmpbuf = tmpbuf; 245 at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen); 246 ASN1_TYPE_free(atmp); 247 if (!at) { 248 BIO_printf(bio_err, "Error parsing structure\n"); 249 ERR_print_errors(bio_err); 250 goto end; 251 } 252 typ = ASN1_TYPE_get(at); 253 if ((typ == V_ASN1_OBJECT) 254 || (typ == V_ASN1_BOOLEAN) 255 || (typ == V_ASN1_NULL)) { 256 BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ)); 257 ERR_print_errors(bio_err); 258 goto end; 259 } 260 /* hmm... this is a little evil but it works */ 261 tmpbuf = at->value.asn1_string->data; 262 tmplen = at->value.asn1_string->length; 263 } 264 str = tmpbuf; 265 num = tmplen; 266 } 267 268 if (offset < 0 || offset >= num) { 269 BIO_printf(bio_err, "Error: offset out of range\n"); 270 goto end; 271 } 272 273 num -= offset; 274 275 if (length == 0 || length > (unsigned int)num) 276 length = (unsigned int)num; 277 if (derout != NULL) { 278 if (BIO_write(derout, str + offset, length) != (int)length) { 279 BIO_printf(bio_err, "Error writing output\n"); 280 ERR_print_errors(bio_err); 281 goto end; 282 } 283 } 284 if (!noout) { 285 const unsigned char *p = str + offset; 286 287 if (it != NULL) { 288 ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it); 289 if (value == NULL) { 290 BIO_printf(bio_err, "Error parsing item %s\n", it->sname); 291 ERR_print_errors(bio_err); 292 goto end; 293 } 294 ASN1_item_print(bio_out, value, 0, it, NULL); 295 ASN1_item_free(value, it); 296 } else { 297 if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) { 298 ERR_print_errors(bio_err); 299 goto end; 300 } 301 } 302 } 303 ret = 0; 304 end: 305 BIO_free(derout); 306 BIO_free(in); 307 BIO_free(b64); 308 if (ret != 0) 309 ERR_print_errors(bio_err); 310 BUF_MEM_free(buf); 311 OPENSSL_free(name); 312 OPENSSL_free(header); 313 ASN1_TYPE_free(at); 314 sk_OPENSSL_STRING_free(osk); 315 return ret; 316 } 317 318 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf) 319 { 320 CONF *cnf = NULL; 321 int len; 322 unsigned char *p; 323 ASN1_TYPE *atyp = NULL; 324 325 if (genconf != NULL) { 326 if ((cnf = app_load_config(genconf)) == NULL) 327 goto err; 328 if (genstr == NULL) 329 genstr = NCONF_get_string(cnf, "default", "asn1"); 330 if (genstr == NULL) { 331 BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf); 332 goto err; 333 } 334 } 335 336 atyp = ASN1_generate_nconf(genstr, cnf); 337 NCONF_free(cnf); 338 cnf = NULL; 339 340 if (atyp == NULL) 341 return -1; 342 343 len = i2d_ASN1_TYPE(atyp, NULL); 344 345 if (len <= 0) 346 goto err; 347 348 if (!BUF_MEM_grow(buf, len)) 349 goto err; 350 351 p = (unsigned char *)buf->data; 352 353 i2d_ASN1_TYPE(atyp, &p); 354 355 ASN1_TYPE_free(atyp); 356 return len; 357 358 err: 359 NCONF_free(cnf); 360 ASN1_TYPE_free(atyp); 361 return -1; 362 } 363