1 /* $OpenBSD: asn1_par.c,v 1.27 2019/03/24 16:07:25 beck 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 if (depth > 128) { 134 BIO_printf(bp, "Max depth exceeded\n"); 135 goto end; 136 } 137 while ((p < tot) && (op < p)) { 138 op = p; 139 j = ASN1_get_object(&p, &len, &tag, &xclass, length); 140 141 if (j & 0x80) { 142 if (BIO_write(bp, "Error in encoding\n", 18) <= 0) 143 goto end; 144 ret = 0; 145 goto end; 146 } 147 hl = (p - op); 148 length -= hl; 149 /* if j == 0x21 it is a constructed indefinite length object */ 150 if (BIO_printf(bp, "%5ld:", (long)offset + 151 (long)(op - *pp)) <= 0) 152 goto end; 153 154 if (j != (V_ASN1_CONSTRUCTED | 1)) { 155 if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ", 156 depth, (long)hl, len) <= 0) 157 goto end; 158 } else { 159 if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", 160 depth, (long)hl) <= 0) 161 goto end; 162 } 163 if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0)) 164 goto end; 165 if (j & V_ASN1_CONSTRUCTED) { 166 ep = p + len; 167 if (BIO_write(bp, "\n", 1) <= 0) 168 goto end; 169 if (len > length) { 170 BIO_printf(bp, "length is greater than %ld\n", 171 length); 172 ret = 0; 173 goto end; 174 } 175 if ((j == 0x21) && (len == 0)) { 176 for (;;) { 177 r = asn1_parse2(bp, &p, (long)(tot - p), 178 offset + (p - *pp), depth + 1, 179 indent, dump); 180 if (r == 0) { 181 ret = 0; 182 goto end; 183 } 184 if ((r == 2) || (p >= tot)) { 185 len = (long)(p - ep); 186 break; 187 } 188 } 189 } else { 190 while (p < ep) { 191 r = asn1_parse2(bp, &p, (long)(ep - p), 192 offset + (p - *pp), depth + 1, 193 indent, dump); 194 if (r == 0) { 195 ret = 0; 196 goto end; 197 } 198 } 199 } 200 } else if (xclass != 0) { 201 p += len; 202 if (BIO_write(bp, "\n", 1) <= 0) 203 goto end; 204 } else { 205 nl = 0; 206 if ((tag == V_ASN1_PRINTABLESTRING) || 207 (tag == V_ASN1_T61STRING) || 208 (tag == V_ASN1_IA5STRING) || 209 (tag == V_ASN1_VISIBLESTRING) || 210 (tag == V_ASN1_NUMERICSTRING) || 211 (tag == V_ASN1_UTF8STRING) || 212 (tag == V_ASN1_UTCTIME) || 213 (tag == V_ASN1_GENERALIZEDTIME)) { 214 if (BIO_write(bp, ":", 1) <= 0) 215 goto end; 216 if ((len > 0) && 217 BIO_write(bp, (const char *)p, (int)len) != 218 (int)len) 219 goto end; 220 } else if (tag == V_ASN1_OBJECT) { 221 opp = op; 222 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != 223 NULL) { 224 if (BIO_write(bp, ":", 1) <= 0) 225 goto end; 226 i2a_ASN1_OBJECT(bp, o); 227 } else { 228 if (BIO_write(bp, ":BAD OBJECT", 229 11) <= 0) 230 goto end; 231 } 232 } else if (tag == V_ASN1_BOOLEAN) { 233 int ii; 234 235 opp = op; 236 ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl); 237 if (ii < 0) { 238 if (BIO_write(bp, "Bad boolean\n", 239 12) <= 0) 240 goto end; 241 } 242 BIO_printf(bp, ":%d", ii); 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 ASN1_INTEGER *bs; 300 int i; 301 302 opp = op; 303 bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl); 304 if (bs != NULL) { 305 if (BIO_write(bp, ":", 1) <= 0) 306 goto end; 307 if (bs->type == V_ASN1_NEG_INTEGER) 308 if (BIO_write(bp, "-", 1) <= 0) 309 goto end; 310 for (i = 0; i < bs->length; i++) { 311 if (BIO_printf(bp, "%02X", 312 bs->data[i]) <= 0) 313 goto end; 314 } 315 if (bs->length == 0) { 316 if (BIO_write(bp, "00", 2) <= 0) 317 goto end; 318 } 319 } else { 320 if (BIO_write(bp, "BAD INTEGER", 11) <= 0) 321 goto end; 322 } 323 ASN1_INTEGER_free(bs); 324 } else if (tag == V_ASN1_ENUMERATED) { 325 ASN1_ENUMERATED *bs; 326 int i; 327 328 opp = op; 329 bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl); 330 if (bs != NULL) { 331 if (BIO_write(bp, ":", 1) <= 0) 332 goto end; 333 if (bs->type == V_ASN1_NEG_ENUMERATED) 334 if (BIO_write(bp, "-", 1) <= 0) 335 goto end; 336 for (i = 0; i < bs->length; i++) { 337 if (BIO_printf(bp, "%02X", 338 bs->data[i]) <= 0) 339 goto end; 340 } 341 if (bs->length == 0) { 342 if (BIO_write(bp, "00", 2) <= 0) 343 goto end; 344 } 345 } else { 346 if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0) 347 goto end; 348 } 349 ASN1_ENUMERATED_free(bs); 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 *pp = p; 381 return (ret); 382 } 383 384 const char * 385 ASN1_tag2str(int tag) 386 { 387 static const char * const tag2str[] = { 388 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */ 389 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */ 390 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", /* 10-13 */ 391 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", /* 15-17 */ 392 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING", /* 18-20 */ 393 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME", /* 21-24 */ 394 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", /* 25-27 */ 395 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING" /* 28-30 */ 396 }; 397 398 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED)) 399 tag &= ~0x100; 400 401 if (tag < 0 || tag > 30) 402 return "(unknown)"; 403 return tag2str[tag]; 404 } 405