1 /* $OpenBSD: asn1_par.c,v 1.24 2015/09/30 18:41:06 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 BIO_indent(bp, indent, 128); 84 85 p = str; 86 if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE) 87 snprintf(str, sizeof str, "priv [ %d ] ", tag); 88 else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC) 89 snprintf(str, sizeof str, "cont [ %d ]", tag); 90 else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION) 91 snprintf(str, sizeof str, "appl [ %d ]", tag); 92 else if (tag > 30) 93 snprintf(str, sizeof str, "<ASN1 %d>", tag); 94 else 95 p = ASN1_tag2str(tag); 96 97 if (BIO_printf(bp, "%-18s", p) <= 0) 98 goto err; 99 return (1); 100 err: 101 return (0); 102 } 103 104 int 105 ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent) 106 { 107 return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0)); 108 } 109 110 int 111 ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump) 112 { 113 return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump)); 114 } 115 116 static int 117 asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset, 118 int depth, int indent, int dump) 119 { 120 const unsigned char *p, *ep, *tot, *op, *opp; 121 long len; 122 int tag, xclass, ret = 0; 123 int nl, hl, j, r; 124 ASN1_OBJECT *o = NULL; 125 ASN1_OCTET_STRING *os = NULL; 126 /* ASN1_BMPSTRING *bmp=NULL;*/ 127 int dump_indent; 128 129 dump_indent = 6; /* Because we know BIO_dump_indent() */ 130 p = *pp; 131 tot = p + length; 132 op = p - 1; 133 while ((p < tot) && (op < p)) { 134 op = p; 135 j = ASN1_get_object(&p, &len, &tag, &xclass, length); 136 137 if (j & 0x80) { 138 if (BIO_write(bp, "Error in encoding\n", 18) <= 0) 139 goto end; 140 ret = 0; 141 goto end; 142 } 143 hl = (p - op); 144 length -= hl; 145 /* if j == 0x21 it is a constructed indefinite length object */ 146 if (BIO_printf(bp, "%5ld:", (long)offset + 147 (long)(op - *pp)) <= 0) 148 goto end; 149 150 if (j != (V_ASN1_CONSTRUCTED | 1)) { 151 if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ", 152 depth, (long)hl, len) <= 0) 153 goto end; 154 } else { 155 if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", 156 depth, (long)hl) <= 0) 157 goto end; 158 } 159 if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0)) 160 goto end; 161 if (j & V_ASN1_CONSTRUCTED) { 162 ep = p + len; 163 if (BIO_write(bp, "\n", 1) <= 0) 164 goto end; 165 if (len > length) { 166 BIO_printf(bp, "length is greater than %ld\n", 167 length); 168 ret = 0; 169 goto end; 170 } 171 if ((j == 0x21) && (len == 0)) { 172 for (;;) { 173 r = asn1_parse2(bp, &p, (long)(tot - p), 174 offset + (p - *pp), depth + 1, 175 indent, dump); 176 if (r == 0) { 177 ret = 0; 178 goto end; 179 } 180 if ((r == 2) || (p >= tot)) 181 break; 182 } 183 } else 184 while (p < ep) { 185 r = asn1_parse2(bp, &p, (long)len, 186 offset + (p - *pp), depth + 1, 187 indent, dump); 188 if (r == 0) { 189 ret = 0; 190 goto end; 191 } 192 } 193 } else if (xclass != 0) { 194 p += len; 195 if (BIO_write(bp, "\n", 1) <= 0) 196 goto end; 197 } else { 198 nl = 0; 199 if ((tag == V_ASN1_PRINTABLESTRING) || 200 (tag == V_ASN1_T61STRING) || 201 (tag == V_ASN1_IA5STRING) || 202 (tag == V_ASN1_VISIBLESTRING) || 203 (tag == V_ASN1_NUMERICSTRING) || 204 (tag == V_ASN1_UTF8STRING) || 205 (tag == V_ASN1_UTCTIME) || 206 (tag == V_ASN1_GENERALIZEDTIME)) { 207 if (BIO_write(bp, ":", 1) <= 0) 208 goto end; 209 if ((len > 0) && 210 BIO_write(bp, (const char *)p, (int)len) != 211 (int)len) 212 goto end; 213 } else if (tag == V_ASN1_OBJECT) { 214 opp = op; 215 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != 216 NULL) { 217 if (BIO_write(bp, ":", 1) <= 0) 218 goto end; 219 i2a_ASN1_OBJECT(bp, o); 220 } else { 221 if (BIO_write(bp, ":BAD OBJECT", 222 11) <= 0) 223 goto end; 224 } 225 } else if (tag == V_ASN1_BOOLEAN) { 226 int ii; 227 228 opp = op; 229 ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl); 230 if (ii < 0) { 231 if (BIO_write(bp, "Bad boolean\n", 232 12) <= 0) 233 goto end; 234 } 235 BIO_printf(bp, ":%d", ii); 236 } else if (tag == V_ASN1_BMPSTRING) { 237 /* do the BMP thang */ 238 } else if (tag == V_ASN1_OCTET_STRING) { 239 int i, printable = 1; 240 241 opp = op; 242 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl); 243 if (os != NULL && os->length > 0) { 244 opp = os->data; 245 /* testing whether the octet string is 246 * printable */ 247 for (i = 0; i < os->length; i++) { 248 if (((opp[i] < ' ') && 249 (opp[i] != '\n') && 250 (opp[i] != '\r') && 251 (opp[i] != '\t')) || 252 (opp[i] > '~')) { 253 printable = 0; 254 break; 255 } 256 } 257 if (printable) { 258 /* printable string */ 259 if (BIO_write(bp, ":", 1) <= 0) 260 goto end; 261 if (BIO_write(bp, (const char *)opp, 262 os->length) <= 0) 263 goto end; 264 } else if (!dump) { 265 /* not printable => print octet string 266 * as hex dump */ 267 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0) 268 goto end; 269 for (i = 0; i < os->length; i++) { 270 if (BIO_printf(bp, 271 "%02X", opp[i]) <= 0) 272 goto end; 273 } 274 } else { 275 /* print the normal dump */ 276 if (!nl) { 277 if (BIO_write(bp, "\n", 1) <= 0) 278 goto end; 279 } 280 if (BIO_dump_indent(bp, 281 (const char *)opp, 282 ((dump == -1 || dump > 283 os->length) ? os->length : dump), 284 dump_indent) <= 0) 285 goto end; 286 nl = 1; 287 } 288 } 289 ASN1_OCTET_STRING_free(os); 290 os = NULL; 291 } else if (tag == V_ASN1_INTEGER) { 292 ASN1_INTEGER *bs; 293 int i; 294 295 opp = op; 296 bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl); 297 if (bs != NULL) { 298 if (BIO_write(bp, ":", 1) <= 0) 299 goto end; 300 if (bs->type == V_ASN1_NEG_INTEGER) 301 if (BIO_write(bp, "-", 1) <= 0) 302 goto end; 303 for (i = 0; i < bs->length; i++) { 304 if (BIO_printf(bp, "%02X", 305 bs->data[i]) <= 0) 306 goto end; 307 } 308 if (bs->length == 0) { 309 if (BIO_write(bp, "00", 2) <= 0) 310 goto end; 311 } 312 } else { 313 if (BIO_write(bp, "BAD INTEGER", 11) <= 0) 314 goto end; 315 } 316 ASN1_INTEGER_free(bs); 317 } else if (tag == V_ASN1_ENUMERATED) { 318 ASN1_ENUMERATED *bs; 319 int i; 320 321 opp = op; 322 bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl); 323 if (bs != NULL) { 324 if (BIO_write(bp, ":", 1) <= 0) 325 goto end; 326 if (bs->type == V_ASN1_NEG_ENUMERATED) 327 if (BIO_write(bp, "-", 1) <= 0) 328 goto end; 329 for (i = 0; i < bs->length; i++) { 330 if (BIO_printf(bp, "%02X", 331 bs->data[i]) <= 0) 332 goto end; 333 } 334 if (bs->length == 0) { 335 if (BIO_write(bp, "00", 2) <= 0) 336 goto end; 337 } 338 } else { 339 if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0) 340 goto end; 341 } 342 ASN1_ENUMERATED_free(bs); 343 } else if (len > 0 && dump) { 344 if (!nl) { 345 if (BIO_write(bp, "\n", 1) <= 0) 346 goto end; 347 } 348 if (BIO_dump_indent(bp, (const char *)p, 349 ((dump == -1 || dump > len) ? len : dump), 350 dump_indent) <= 0) 351 goto end; 352 nl = 1; 353 } 354 355 if (!nl) { 356 if (BIO_write(bp, "\n", 1) <= 0) 357 goto end; 358 } 359 p += len; 360 if ((tag == V_ASN1_EOC) && (xclass == 0)) { 361 ret = 2; /* End of sequence */ 362 goto end; 363 } 364 } 365 length -= len; 366 } 367 ret = 1; 368 369 end: 370 if (o != NULL) 371 ASN1_OBJECT_free(o); 372 ASN1_OCTET_STRING_free(os); 373 *pp = p; 374 return (ret); 375 } 376 377 const char * 378 ASN1_tag2str(int tag) 379 { 380 static const char * const tag2str[] = { 381 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */ 382 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */ 383 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", /* 10-13 */ 384 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", /* 15-17 */ 385 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING", /* 18-20 */ 386 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME", /* 21-24 */ 387 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", /* 25-27 */ 388 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING" /* 28-30 */ 389 }; 390 391 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED)) 392 tag &= ~0x100; 393 394 if (tag < 0 || tag > 30) 395 return "(unknown)"; 396 return tag2str[tag]; 397 } 398