a_bytes.c revision 306195
1/* crypto/asn1/a_bytes.c */ 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#include "cryptlib.h" 61#include <openssl/asn1.h> 62 63static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c, 64 int depth); 65static ASN1_STRING *int_d2i_ASN1_bytes(ASN1_STRING **a, 66 const unsigned char **pp, long length, 67 int Ptag, int Pclass, int depth, 68 int *perr); 69/* 70 * type is a 'bitmap' of acceptable string types. 71 */ 72ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp, 73 long length, int type) 74{ 75 ASN1_STRING *ret = NULL; 76 const unsigned char *p; 77 unsigned char *s; 78 long len; 79 int inf, tag, xclass; 80 int i = 0; 81 82 p = *pp; 83 inf = ASN1_get_object(&p, &len, &tag, &xclass, length); 84 if (inf & 0x80) 85 goto err; 86 87 if (tag >= 32) { 88 i = ASN1_R_TAG_VALUE_TOO_HIGH; 89 goto err; 90 } 91 if (!(ASN1_tag2bit(tag) & type)) { 92 i = ASN1_R_WRONG_TYPE; 93 goto err; 94 } 95 96 /* If a bit-string, exit early */ 97 if (tag == V_ASN1_BIT_STRING) 98 return (d2i_ASN1_BIT_STRING(a, pp, length)); 99 100 if ((a == NULL) || ((*a) == NULL)) { 101 if ((ret = ASN1_STRING_new()) == NULL) 102 return (NULL); 103 } else 104 ret = (*a); 105 106 if (len != 0) { 107 s = OPENSSL_malloc((int)len + 1); 108 if (s == NULL) { 109 i = ERR_R_MALLOC_FAILURE; 110 goto err; 111 } 112 memcpy(s, p, (int)len); 113 s[len] = '\0'; 114 p += len; 115 } else 116 s = NULL; 117 118 if (ret->data != NULL) 119 OPENSSL_free(ret->data); 120 ret->length = (int)len; 121 ret->data = s; 122 ret->type = tag; 123 if (a != NULL) 124 (*a) = ret; 125 *pp = p; 126 return (ret); 127 err: 128 ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES, i); 129 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 130 ASN1_STRING_free(ret); 131 return (NULL); 132} 133 134int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass) 135{ 136 int ret, r, constructed; 137 unsigned char *p; 138 139 if (a == NULL) 140 return (0); 141 142 if (tag == V_ASN1_BIT_STRING) 143 return (i2d_ASN1_BIT_STRING(a, pp)); 144 145 ret = a->length; 146 r = ASN1_object_size(0, ret, tag); 147 if (pp == NULL) 148 return (r); 149 p = *pp; 150 151 if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET)) 152 constructed = 1; 153 else 154 constructed = 0; 155 ASN1_put_object(&p, constructed, ret, tag, xclass); 156 memcpy(p, a->data, a->length); 157 p += a->length; 158 *pp = p; 159 return (r); 160} 161 162/* 163 * Maximum recursion depth of d2i_ASN1_bytes(): much more than should be 164 * encountered in pratice. 165 */ 166 167#define ASN1_BYTES_MAXDEPTH 20 168 169ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp, 170 long length, int Ptag, int Pclass) 171{ 172 int err = 0; 173 ASN1_STRING *s = int_d2i_ASN1_bytes(a, pp, length, Ptag, Pclass, 0, &err); 174 if (err != 0) 175 ASN1err(ASN1_F_D2I_ASN1_BYTES, err); 176 return s; 177} 178 179static ASN1_STRING *int_d2i_ASN1_bytes(ASN1_STRING **a, 180 const unsigned char **pp, long length, 181 int Ptag, int Pclass, 182 int depth, int *perr) 183{ 184 ASN1_STRING *ret = NULL; 185 const unsigned char *p; 186 unsigned char *s; 187 long len; 188 int inf, tag, xclass; 189 190 if (depth > ASN1_BYTES_MAXDEPTH) { 191 *perr = ASN1_R_NESTED_ASN1_STRING; 192 return NULL; 193 } 194 195 if ((a == NULL) || ((*a) == NULL)) { 196 if ((ret = ASN1_STRING_new()) == NULL) 197 return (NULL); 198 } else 199 ret = (*a); 200 201 p = *pp; 202 inf = ASN1_get_object(&p, &len, &tag, &xclass, length); 203 if (inf & 0x80) { 204 *perr = ASN1_R_BAD_OBJECT_HEADER; 205 goto err; 206 } 207 208 if (tag != Ptag) { 209 *perr = ASN1_R_WRONG_TAG; 210 goto err; 211 } 212 213 if (inf & V_ASN1_CONSTRUCTED) { 214 ASN1_const_CTX c; 215 216 c.error = 0; 217 c.pp = pp; 218 c.p = p; 219 c.inf = inf; 220 c.slen = len; 221 c.tag = Ptag; 222 c.xclass = Pclass; 223 c.max = (length == 0) ? 0 : (p + length); 224 if (!asn1_collate_primitive(ret, &c, depth)) { 225 *perr = c.error; 226 goto err; 227 } else { 228 p = c.p; 229 } 230 } else { 231 if (len != 0) { 232 if ((ret->length < len) || (ret->data == NULL)) { 233 s = OPENSSL_malloc((int)len + 1); 234 if (s == NULL) { 235 *perr = ERR_R_MALLOC_FAILURE; 236 goto err; 237 } 238 if (ret->data != NULL) 239 OPENSSL_free(ret->data); 240 } else 241 s = ret->data; 242 memcpy(s, p, (int)len); 243 s[len] = '\0'; 244 p += len; 245 } else { 246 s = NULL; 247 if (ret->data != NULL) 248 OPENSSL_free(ret->data); 249 } 250 251 ret->length = (int)len; 252 ret->data = s; 253 ret->type = Ptag; 254 } 255 256 if (a != NULL) 257 (*a) = ret; 258 *pp = p; 259 return (ret); 260 err: 261 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 262 ASN1_STRING_free(ret); 263 return (NULL); 264} 265 266/* 267 * We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse them 268 * into the one structure that is then returned 269 */ 270/* 271 * There have been a few bug fixes for this function from Paul Keogh 272 * <paul.keogh@sse.ie>, many thanks to him 273 */ 274static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c, 275 int depth) 276{ 277 ASN1_STRING *os = NULL; 278 BUF_MEM b; 279 int num; 280 281 b.length = 0; 282 b.max = 0; 283 b.data = NULL; 284 285 if (a == NULL) { 286 c->error = ERR_R_PASSED_NULL_PARAMETER; 287 goto err; 288 } 289 290 num = 0; 291 for (;;) { 292 if (c->inf & 1) { 293 c->eos = ASN1_const_check_infinite_end(&c->p, 294 (long)(c->max - c->p)); 295 if (c->eos) 296 break; 297 } else { 298 if (c->slen <= 0) 299 break; 300 } 301 302 c->q = c->p; 303 if (int_d2i_ASN1_bytes(&os, &c->p, c->max - c->p, c->tag, c->xclass, 304 depth + 1, &c->error) == NULL) { 305 goto err; 306 } 307 308 if (!BUF_MEM_grow_clean(&b, num + os->length)) { 309 c->error = ERR_R_BUF_LIB; 310 goto err; 311 } 312 memcpy(&(b.data[num]), os->data, os->length); 313 if (!(c->inf & 1)) 314 c->slen -= (c->p - c->q); 315 num += os->length; 316 } 317 318 if (!asn1_const_Finish(c)) 319 goto err; 320 321 a->length = num; 322 if (a->data != NULL) 323 OPENSSL_free(a->data); 324 a->data = (unsigned char *)b.data; 325 if (os != NULL) 326 ASN1_STRING_free(os); 327 return (1); 328 err: 329 if (os != NULL) 330 ASN1_STRING_free(os); 331 if (b.data != NULL) 332 OPENSSL_free(b.data); 333 return (0); 334} 335