1 /* $OpenBSD: asn1_par.c,v 1.34 2022/02/12 03:07:24 jsing 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 #include <stdio.h> 60 61 #include <openssl/asn1.h> 62 #include <openssl/buffer.h> 63 #include <openssl/objects.h> 64 65 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed, 66 int indent); 67 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, 68 int offset, int depth, int indent, int dump); 69 70 static int 71 asn1_print_info(BIO *bp, int tag, int xclass, int constructed, 72 int indent) 73 { 74 char str[128]; 75 const char *p; 76 77 if (constructed & V_ASN1_CONSTRUCTED) 78 p="cons: "; 79 else 80 p="prim: "; 81 if (BIO_write(bp, p, 6) < 6) 82 goto err; 83 if (!BIO_indent(bp, indent, 128)) 84 goto err; 85 86 p = str; 87 if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE) 88 snprintf(str, sizeof str, "priv [ %d ] ", tag); 89 else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC) 90 snprintf(str, sizeof str, "cont [ %d ]", tag); 91 else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION) 92 snprintf(str, sizeof str, "appl [ %d ]", tag); 93 else if (tag > 30) 94 snprintf(str, sizeof str, "<ASN1 %d>", tag); 95 else 96 p = ASN1_tag2str(tag); 97 98 if (BIO_printf(bp, "%-18s", p) <= 0) 99 goto err; 100 return (1); 101 err: 102 return (0); 103 } 104 105 int 106 ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent) 107 { 108 return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0)); 109 } 110 111 int 112 ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump) 113 { 114 return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump)); 115 } 116 117 static int 118 asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset, 119 int depth, int indent, int dump) 120 { 121 const unsigned char *p, *ep, *tot, *op, *opp; 122 long len; 123 int tag, xclass, ret = 0; 124 int nl, hl, j, r; 125 ASN1_OBJECT *o = NULL; 126 ASN1_OCTET_STRING *os = NULL; 127 ASN1_INTEGER *ai = NULL; 128 ASN1_ENUMERATED *ae = NULL; 129 /* ASN1_BMPSTRING *bmp=NULL;*/ 130 int dump_indent; 131 132 dump_indent = 6; /* Because we know BIO_dump_indent() */ 133 p = *pp; 134 tot = p + length; 135 op = p - 1; 136 if (depth > 128) { 137 BIO_printf(bp, "Max depth exceeded\n"); 138 goto end; 139 } 140 while ((p < tot) && (op < p)) { 141 op = p; 142 j = ASN1_get_object(&p, &len, &tag, &xclass, length); 143 144 if (j & 0x80) { 145 if (BIO_write(bp, "Error in encoding\n", 18) <= 0) 146 goto end; 147 ret = 0; 148 goto end; 149 } 150 hl = (p - op); 151 length -= hl; 152 /* if j == 0x21 it is a constructed indefinite length object */ 153 if (BIO_printf(bp, "%5ld:", (long)offset + 154 (long)(op - *pp)) <= 0) 155 goto end; 156 157 if (j != (V_ASN1_CONSTRUCTED | 1)) { 158 if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ", 159 depth, (long)hl, len) <= 0) 160 goto end; 161 } else { 162 if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", 163 depth, (long)hl) <= 0) 164 goto end; 165 } 166 if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0)) 167 goto end; 168 if (j & V_ASN1_CONSTRUCTED) { 169 ep = p + len; 170 if (BIO_write(bp, "\n", 1) <= 0) 171 goto end; 172 if (len > length) { 173 BIO_printf(bp, "length is greater than %ld\n", 174 length); 175 ret = 0; 176 goto end; 177 } 178 if ((j == 0x21) && (len == 0)) { 179 for (;;) { 180 r = asn1_parse2(bp, &p, (long)(tot - p), 181 offset + (p - *pp), depth + 1, 182 indent, dump); 183 if (r == 0) { 184 ret = 0; 185 goto end; 186 } 187 if ((r == 2) || (p >= tot)) { 188 len = (long)(p - ep); 189 break; 190 } 191 } 192 } else { 193 while (p < ep) { 194 r = asn1_parse2(bp, &p, (long)(ep - p), 195 offset + (p - *pp), depth + 1, 196 indent, dump); 197 if (r == 0) { 198 ret = 0; 199 goto end; 200 } 201 } 202 } 203 } else if (xclass != 0) { 204 p += len; 205 if (BIO_write(bp, "\n", 1) <= 0) 206 goto end; 207 } else { 208 nl = 0; 209 if ((tag == V_ASN1_PRINTABLESTRING) || 210 (tag == V_ASN1_T61STRING) || 211 (tag == V_ASN1_IA5STRING) || 212 (tag == V_ASN1_VISIBLESTRING) || 213 (tag == V_ASN1_NUMERICSTRING) || 214 (tag == V_ASN1_UTF8STRING) || 215 (tag == V_ASN1_UTCTIME) || 216 (tag == V_ASN1_GENERALIZEDTIME)) { 217 if (BIO_write(bp, ":", 1) <= 0) 218 goto end; 219 if ((len > 0) && 220 BIO_write(bp, (const char *)p, (int)len) != 221 (int)len) 222 goto end; 223 } else if (tag == V_ASN1_OBJECT) { 224 opp = op; 225 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != 226 NULL) { 227 if (BIO_write(bp, ":", 1) <= 0) 228 goto end; 229 i2a_ASN1_OBJECT(bp, o); 230 } else { 231 if (BIO_write(bp, ":BAD OBJECT", 232 11) <= 0) 233 goto end; 234 } 235 } else if (tag == V_ASN1_BOOLEAN) { 236 if (len == 1 && p < tot) { 237 BIO_printf(bp, ":%u", p[0]); 238 } else { 239 if (BIO_write(bp, "Bad boolean\n", 240 12) <= 0) 241 goto end; 242 } 243 } else if (tag == V_ASN1_BMPSTRING) { 244 /* do the BMP thang */ 245 } else if (tag == V_ASN1_OCTET_STRING) { 246 int i, printable = 1; 247 248 opp = op; 249 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl); 250 if (os != NULL && os->length > 0) { 251 opp = os->data; 252 /* testing whether the octet string is 253 * printable */ 254 for (i = 0; i < os->length; i++) { 255 if (((opp[i] < ' ') && 256 (opp[i] != '\n') && 257 (opp[i] != '\r') && 258 (opp[i] != '\t')) || 259 (opp[i] > '~')) { 260 printable = 0; 261 break; 262 } 263 } 264 if (printable) { 265 /* printable string */ 266 if (BIO_write(bp, ":", 1) <= 0) 267 goto end; 268 if (BIO_write(bp, (const char *)opp, 269 os->length) <= 0) 270 goto end; 271 } else if (!dump) { 272 /* not printable => print octet string 273 * as hex dump */ 274 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0) 275 goto end; 276 for (i = 0; i < os->length; i++) { 277 if (BIO_printf(bp, 278 "%02X", opp[i]) <= 0) 279 goto end; 280 } 281 } else { 282 /* print the normal dump */ 283 if (!nl) { 284 if (BIO_write(bp, "\n", 1) <= 0) 285 goto end; 286 } 287 if (BIO_dump_indent(bp, 288 (const char *)opp, 289 ((dump == -1 || dump > 290 os->length) ? os->length : dump), 291 dump_indent) <= 0) 292 goto end; 293 nl = 1; 294 } 295 } 296 ASN1_OCTET_STRING_free(os); 297 os = NULL; 298 } else if (tag == V_ASN1_INTEGER) { 299 int i; 300 301 opp = op; 302 ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl); 303 if (ai != NULL) { 304 if (BIO_write(bp, ":", 1) <= 0) 305 goto end; 306 if (ai->type == V_ASN1_NEG_INTEGER) 307 if (BIO_write(bp, "-", 1) <= 0) 308 goto end; 309 for (i = 0; i < ai->length; i++) { 310 if (BIO_printf(bp, "%02X", 311 ai->data[i]) <= 0) 312 goto end; 313 } 314 if (ai->length == 0) { 315 if (BIO_write(bp, "00", 2) <= 0) 316 goto end; 317 } 318 } else { 319 if (BIO_write(bp, "BAD INTEGER", 11) <= 0) 320 goto end; 321 } 322 ASN1_INTEGER_free(ai); 323 ai = NULL; 324 } else if (tag == V_ASN1_ENUMERATED) { 325 int i; 326 327 opp = op; 328 ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl); 329 if (ae != NULL) { 330 if (BIO_write(bp, ":", 1) <= 0) 331 goto end; 332 if (ae->type == V_ASN1_NEG_ENUMERATED) 333 if (BIO_write(bp, "-", 1) <= 0) 334 goto end; 335 for (i = 0; i < ae->length; i++) { 336 if (BIO_printf(bp, "%02X", 337 ae->data[i]) <= 0) 338 goto end; 339 } 340 if (ae->length == 0) { 341 if (BIO_write(bp, "00", 2) <= 0) 342 goto end; 343 } 344 } else { 345 if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0) 346 goto end; 347 } 348 ASN1_ENUMERATED_free(ae); 349 ae = NULL; 350 } else if (len > 0 && dump) { 351 if (!nl) { 352 if (BIO_write(bp, "\n", 1) <= 0) 353 goto end; 354 } 355 if (BIO_dump_indent(bp, (const char *)p, 356 ((dump == -1 || dump > len) ? len : dump), 357 dump_indent) <= 0) 358 goto end; 359 nl = 1; 360 } 361 362 if (!nl) { 363 if (BIO_write(bp, "\n", 1) <= 0) 364 goto end; 365 } 366 p += len; 367 if ((tag == V_ASN1_EOC) && (xclass == 0)) { 368 ret = 2; /* End of sequence */ 369 goto end; 370 } 371 } 372 length -= len; 373 } 374 ret = 1; 375 376 end: 377 if (o != NULL) 378 ASN1_OBJECT_free(o); 379 ASN1_OCTET_STRING_free(os); 380 ASN1_INTEGER_free(ai); 381 ASN1_ENUMERATED_free(ae); 382 *pp = p; 383 return (ret); 384 } 385