1 /* $OpenBSD: asn1_par.c,v 1.20 2014/07/12 16:03:36 miod 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 static const char fmt[] = "%-18s"; 75 char str[128]; 76 const char *p; 77 78 if (constructed & V_ASN1_CONSTRUCTED) 79 p="cons: "; 80 else 81 p="prim: "; 82 if (BIO_write(bp, p, 6) < 6) 83 goto err; 84 BIO_indent(bp, indent, 128); 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, fmt, 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_BMPSTRING *bmp=NULL;*/ 128 int dump_indent; 129 130 #if 0 131 dump_indent = indent; 132 #else 133 dump_indent = 6; /* Because we know BIO_dump_indent() */ 134 #endif 135 p = *pp; 136 tot = p + length; 137 op = p - 1; 138 while ((p < tot) && (op < p)) { 139 op = p; 140 j = ASN1_get_object(&p, &len, &tag, &xclass, length); 141 142 if (j & 0x80) { 143 if (BIO_write(bp, "Error in encoding\n", 18) <= 0) 144 goto end; 145 ret = 0; 146 goto end; 147 } 148 hl = (p - op); 149 length -= hl; 150 /* if j == 0x21 it is a constructed indefinite length object */ 151 if (BIO_printf(bp, "%5ld:", (long)offset + 152 (long)(op - *pp)) <= 0) 153 goto end; 154 155 if (j != (V_ASN1_CONSTRUCTED | 1)) { 156 if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ", 157 depth, (long)hl, len) <= 0) 158 goto end; 159 } else { 160 if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", 161 depth, (long)hl) <= 0) 162 goto end; 163 } 164 if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0)) 165 goto end; 166 if (j & V_ASN1_CONSTRUCTED) { 167 ep = p + len; 168 if (BIO_write(bp, "\n", 1) <= 0) 169 goto end; 170 if (len > length) { 171 BIO_printf(bp, "length is greater than %ld\n", 172 length); 173 ret = 0; 174 goto end; 175 } 176 if ((j == 0x21) && (len == 0)) { 177 for (;;) { 178 r = asn1_parse2(bp, &p, (long)(tot - p), 179 offset + (p - *pp), depth + 1, 180 indent, dump); 181 if (r == 0) { 182 ret = 0; 183 goto end; 184 } 185 if ((r == 2) || (p >= tot)) 186 break; 187 } 188 } else 189 while (p < ep) { 190 r = asn1_parse2(bp, &p, (long)len, 191 offset + (p - *pp), depth + 1, 192 indent, dump); 193 if (r == 0) { 194 ret = 0; 195 goto end; 196 } 197 } 198 } else if (xclass != 0) { 199 p += len; 200 if (BIO_write(bp, "\n", 1) <= 0) 201 goto end; 202 } else { 203 nl = 0; 204 if ((tag == V_ASN1_PRINTABLESTRING) || 205 (tag == V_ASN1_T61STRING) || 206 (tag == V_ASN1_IA5STRING) || 207 (tag == V_ASN1_VISIBLESTRING) || 208 (tag == V_ASN1_NUMERICSTRING) || 209 (tag == V_ASN1_UTF8STRING) || 210 (tag == V_ASN1_UTCTIME) || 211 (tag == V_ASN1_GENERALIZEDTIME)) { 212 if (BIO_write(bp, ":", 1) <= 0) 213 goto end; 214 if ((len > 0) && 215 BIO_write(bp, (const char *)p, (int)len) != 216 (int)len) 217 goto end; 218 } else if (tag == V_ASN1_OBJECT) { 219 opp = op; 220 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != 221 NULL) { 222 if (BIO_write(bp, ":", 1) <= 0) 223 goto end; 224 i2a_ASN1_OBJECT(bp, o); 225 } else { 226 if (BIO_write(bp, ":BAD OBJECT", 227 11) <= 0) 228 goto end; 229 } 230 } else if (tag == V_ASN1_BOOLEAN) { 231 int ii; 232 233 opp = op; 234 ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl); 235 if (ii < 0) { 236 if (BIO_write(bp, "Bad boolean\n", 237 12) <= 0) 238 goto end; 239 } 240 BIO_printf(bp, ":%d", ii); 241 } else if (tag == V_ASN1_BMPSTRING) { 242 /* do the BMP thang */ 243 } else if (tag == V_ASN1_OCTET_STRING) { 244 int i, printable = 1; 245 246 opp = op; 247 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl); 248 if (os != NULL && os->length > 0) { 249 opp = os->data; 250 /* testing whether the octet string is 251 * printable */ 252 for (i = 0; i < os->length; i++) { 253 if (((opp[i] < ' ') && 254 (opp[i] != '\n') && 255 (opp[i] != '\r') && 256 (opp[i] != '\t')) || 257 (opp[i] > '~')) { 258 printable = 0; 259 break; 260 } 261 } 262 if (printable) { 263 /* printable string */ 264 if (BIO_write(bp, ":", 1) <= 0) 265 goto end; 266 if (BIO_write(bp, (const char *)opp, 267 os->length) <= 0) 268 goto end; 269 } else if (!dump) { 270 /* not printable => print octet string 271 * as hex dump */ 272 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0) 273 goto end; 274 for (i = 0; i < os->length; i++) { 275 if (BIO_printf(bp, 276 "%02X", opp[i]) <= 0) 277 goto end; 278 } 279 } else { 280 /* print the normal dump */ 281 if (!nl) { 282 if (BIO_write(bp, "\n", 1) <= 0) 283 goto end; 284 } 285 if (BIO_dump_indent(bp, 286 (const char *)opp, 287 ((dump == -1 || dump > 288 os->length) ? os->length : dump), 289 dump_indent) <= 0) 290 goto end; 291 nl = 1; 292 } 293 } 294 M_ASN1_OCTET_STRING_free(os); 295 os = NULL; 296 } else if (tag == V_ASN1_INTEGER) { 297 ASN1_INTEGER *bs; 298 int i; 299 300 opp = op; 301 bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl); 302 if (bs != NULL) { 303 if (BIO_write(bp, ":", 1) <= 0) 304 goto end; 305 if (bs->type == V_ASN1_NEG_INTEGER) 306 if (BIO_write(bp, "-", 1) <= 0) 307 goto end; 308 for (i = 0; i < bs->length; i++) { 309 if (BIO_printf(bp, "%02X", 310 bs->data[i]) <= 0) 311 goto end; 312 } 313 if (bs->length == 0) { 314 if (BIO_write(bp, "00", 2) <= 0) 315 goto end; 316 } 317 } else { 318 if (BIO_write(bp, "BAD INTEGER", 11) <= 0) 319 goto end; 320 } 321 M_ASN1_INTEGER_free(bs); 322 } else if (tag == V_ASN1_ENUMERATED) { 323 ASN1_ENUMERATED *bs; 324 int i; 325 326 opp = op; 327 bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl); 328 if (bs != NULL) { 329 if (BIO_write(bp, ":", 1) <= 0) 330 goto end; 331 if (bs->type == V_ASN1_NEG_ENUMERATED) 332 if (BIO_write(bp, "-", 1) <= 0) 333 goto end; 334 for (i = 0; i < bs->length; i++) { 335 if (BIO_printf(bp, "%02X", 336 bs->data[i]) <= 0) 337 goto end; 338 } 339 if (bs->length == 0) { 340 if (BIO_write(bp, "00", 2) <= 0) 341 goto end; 342 } 343 } else { 344 if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0) 345 goto end; 346 } 347 M_ASN1_ENUMERATED_free(bs); 348 } else if (len > 0 && dump) { 349 if (!nl) { 350 if (BIO_write(bp, "\n", 1) <= 0) 351 goto end; 352 } 353 if (BIO_dump_indent(bp, (const char *)p, 354 ((dump == -1 || dump > len) ? len : dump), 355 dump_indent) <= 0) 356 goto end; 357 nl = 1; 358 } 359 360 if (!nl) { 361 if (BIO_write(bp, "\n", 1) <= 0) 362 goto end; 363 } 364 p += len; 365 if ((tag == V_ASN1_EOC) && (xclass == 0)) { 366 ret = 2; /* End of sequence */ 367 goto end; 368 } 369 } 370 length -= len; 371 } 372 ret = 1; 373 374 end: 375 if (o != NULL) 376 ASN1_OBJECT_free(o); 377 M_ASN1_OCTET_STRING_free(os); 378 *pp = p; 379 return (ret); 380 } 381 382 const char * 383 ASN1_tag2str(int tag) 384 { 385 static const char * const tag2str[] = { 386 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */ 387 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */ 388 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", /* 10-13 */ 389 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", /* 15-17 */ 390 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING", /* 18-20 */ 391 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME", /* 21-24 */ 392 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", /* 25-27 */ 393 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING" /* 28-30 */ 394 }; 395 396 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED)) 397 tag &= ~0x100; 398 399 if (tag < 0 || tag > 30) 400 return "(unknown)"; 401 return tag2str[tag]; 402 } 403