1/* crypto/asn1/x_x509.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#include <assert.h> 59#include <limits.h> 60#include <stdio.h> 61 62#include <openssl/asn1t.h> 63#include <openssl/evp.h> 64#include <openssl/mem.h> 65#include <openssl/obj.h> 66#include <openssl/pool.h> 67#include <openssl/thread.h> 68#include <openssl/x509.h> 69#include <openssl/x509v3.h> 70 71#include "../internal.h" 72 73static CRYPTO_EX_DATA_CLASS g_ex_data_class = CRYPTO_EX_DATA_CLASS_INIT; 74 75ASN1_SEQUENCE_enc(X509_CINF, enc, 0) = { 76 ASN1_EXP_OPT(X509_CINF, version, ASN1_INTEGER, 0), 77 ASN1_SIMPLE(X509_CINF, serialNumber, ASN1_INTEGER), 78 ASN1_SIMPLE(X509_CINF, signature, X509_ALGOR), 79 ASN1_SIMPLE(X509_CINF, issuer, X509_NAME), 80 ASN1_SIMPLE(X509_CINF, validity, X509_VAL), 81 ASN1_SIMPLE(X509_CINF, subject, X509_NAME), 82 ASN1_SIMPLE(X509_CINF, key, X509_PUBKEY), 83 ASN1_IMP_OPT(X509_CINF, issuerUID, ASN1_BIT_STRING, 1), 84 ASN1_IMP_OPT(X509_CINF, subjectUID, ASN1_BIT_STRING, 2), 85 ASN1_EXP_SEQUENCE_OF_OPT(X509_CINF, extensions, X509_EXTENSION, 3) 86} ASN1_SEQUENCE_END_enc(X509_CINF, X509_CINF) 87 88IMPLEMENT_ASN1_FUNCTIONS(X509_CINF) 89/* X509 top level structure needs a bit of customisation */ 90 91extern void policy_cache_free(X509_POLICY_CACHE *cache); 92 93static int x509_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 94 void *exarg) 95{ 96 X509 *ret = (X509 *)*pval; 97 98 switch (operation) { 99 100 case ASN1_OP_NEW_POST: 101 ret->name = NULL; 102 ret->ex_flags = 0; 103 ret->ex_pathlen = -1; 104 ret->skid = NULL; 105 ret->akid = NULL; 106 ret->aux = NULL; 107 ret->crldp = NULL; 108 ret->buf = NULL; 109 CRYPTO_new_ex_data(&ret->ex_data); 110 CRYPTO_MUTEX_init(&ret->lock); 111 break; 112 113 case ASN1_OP_D2I_PRE: 114 CRYPTO_BUFFER_free(ret->buf); 115 ret->buf = NULL; 116 break; 117 118 case ASN1_OP_D2I_POST: 119 if (ret->name != NULL) 120 OPENSSL_free(ret->name); 121 ret->name = X509_NAME_oneline(ret->cert_info->subject, NULL, 0); 122 break; 123 124 case ASN1_OP_FREE_POST: 125 CRYPTO_MUTEX_cleanup(&ret->lock); 126 CRYPTO_free_ex_data(&g_ex_data_class, ret, &ret->ex_data); 127 X509_CERT_AUX_free(ret->aux); 128 ASN1_OCTET_STRING_free(ret->skid); 129 AUTHORITY_KEYID_free(ret->akid); 130 CRL_DIST_POINTS_free(ret->crldp); 131 policy_cache_free(ret->policy_cache); 132 GENERAL_NAMES_free(ret->altname); 133 NAME_CONSTRAINTS_free(ret->nc); 134 CRYPTO_BUFFER_free(ret->buf); 135 OPENSSL_free(ret->name); 136 break; 137 138 } 139 140 return 1; 141 142} 143 144ASN1_SEQUENCE_ref(X509, x509_cb) = { 145 ASN1_SIMPLE(X509, cert_info, X509_CINF), 146 ASN1_SIMPLE(X509, sig_alg, X509_ALGOR), 147 ASN1_SIMPLE(X509, signature, ASN1_BIT_STRING) 148} ASN1_SEQUENCE_END_ref(X509, X509) 149 150IMPLEMENT_ASN1_FUNCTIONS(X509) 151 152IMPLEMENT_ASN1_DUP_FUNCTION(X509) 153 154X509 *X509_parse_from_buffer(CRYPTO_BUFFER *buf) { 155 if (CRYPTO_BUFFER_len(buf) > LONG_MAX) { 156 OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); 157 return 0; 158 } 159 160 X509 *x509 = X509_new(); 161 if (x509 == NULL) { 162 return NULL; 163 } 164 165 x509->cert_info->enc.alias_only_on_next_parse = 1; 166 167 const uint8_t *inp = CRYPTO_BUFFER_data(buf); 168 X509 *x509p = x509; 169 X509 *ret = d2i_X509(&x509p, &inp, CRYPTO_BUFFER_len(buf)); 170 if (ret == NULL || 171 inp - CRYPTO_BUFFER_data(buf) != (ptrdiff_t)CRYPTO_BUFFER_len(buf)) { 172 X509_free(x509p); 173 return NULL; 174 } 175 assert(x509p == x509); 176 assert(ret == x509); 177 178 CRYPTO_BUFFER_up_ref(buf); 179 ret->buf = buf; 180 181 return ret; 182} 183 184int X509_up_ref(X509 *x) 185{ 186 CRYPTO_refcount_inc(&x->references); 187 return 1; 188} 189 190int X509_get_ex_new_index(long argl, void *argp, CRYPTO_EX_unused * unused, 191 CRYPTO_EX_dup *dup_unused, CRYPTO_EX_free *free_func) 192{ 193 int index; 194 if (!CRYPTO_get_ex_new_index(&g_ex_data_class, &index, argl, argp, 195 free_func)) { 196 return -1; 197 } 198 return index; 199} 200 201int X509_set_ex_data(X509 *r, int idx, void *arg) 202{ 203 return (CRYPTO_set_ex_data(&r->ex_data, idx, arg)); 204} 205 206void *X509_get_ex_data(X509 *r, int idx) 207{ 208 return (CRYPTO_get_ex_data(&r->ex_data, idx)); 209} 210 211/* 212 * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with 213 * extra info tagged on the end. Since these functions set how a certificate 214 * is trusted they should only be used when the certificate comes from a 215 * reliable source such as local storage. 216 */ 217 218X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length) 219{ 220 const unsigned char *q = *pp; 221 X509 *ret; 222 int freeret = 0; 223 224 if (!a || *a == NULL) 225 freeret = 1; 226 ret = d2i_X509(a, &q, length); 227 /* If certificate unreadable then forget it */ 228 if (!ret) 229 return NULL; 230 /* update length */ 231 length -= q - *pp; 232 /* Parse auxiliary information if there is any. */ 233 if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length)) 234 goto err; 235 *pp = q; 236 return ret; 237 err: 238 if (freeret) { 239 X509_free(ret); 240 if (a) 241 *a = NULL; 242 } 243 return NULL; 244} 245 246/* 247 * Serialize trusted certificate to *pp or just return the required buffer 248 * length if pp == NULL. We ultimately want to avoid modifying *pp in the 249 * error path, but that depends on similar hygiene in lower-level functions. 250 * Here we avoid compounding the problem. 251 */ 252static int i2d_x509_aux_internal(X509 *a, unsigned char **pp) 253{ 254 int length, tmplen; 255 unsigned char *start = pp != NULL ? *pp : NULL; 256 257 assert(pp == NULL || *pp != NULL); 258 259 /* 260 * This might perturb *pp on error, but fixing that belongs in i2d_X509() 261 * not here. It should be that if a == NULL length is zero, but we check 262 * both just in case. 263 */ 264 length = i2d_X509(a, pp); 265 if (length <= 0 || a == NULL) { 266 return length; 267 } 268 269 tmplen = i2d_X509_CERT_AUX(a->aux, pp); 270 if (tmplen < 0) { 271 if (start != NULL) 272 *pp = start; 273 return tmplen; 274 } 275 length += tmplen; 276 277 return length; 278} 279 280/* 281 * Serialize trusted certificate to *pp, or just return the required buffer 282 * length if pp == NULL. 283 * 284 * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since 285 * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do 286 * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the 287 * allocated buffer. 288 */ 289int i2d_X509_AUX(X509 *a, unsigned char **pp) 290{ 291 int length; 292 unsigned char *tmp; 293 294 /* Buffer provided by caller */ 295 if (pp == NULL || *pp != NULL) 296 return i2d_x509_aux_internal(a, pp); 297 298 /* Obtain the combined length */ 299 if ((length = i2d_x509_aux_internal(a, NULL)) <= 0) 300 return length; 301 302 /* Allocate requisite combined storage */ 303 *pp = tmp = OPENSSL_malloc(length); 304 if (tmp == NULL) 305 return -1; /* Push error onto error stack? */ 306 307 /* Encode, but keep *pp at the originally malloced pointer */ 308 length = i2d_x509_aux_internal(a, &tmp); 309 if (length <= 0) { 310 OPENSSL_free(*pp); 311 *pp = NULL; 312 } 313 return length; 314} 315 316void X509_get0_signature(const ASN1_BIT_STRING **psig, const X509_ALGOR **palg, 317 const X509 *x) 318{ 319 if (psig) 320 *psig = x->signature; 321 if (palg) 322 *palg = x->sig_alg; 323} 324 325int X509_get_signature_nid(const X509 *x) 326{ 327 return OBJ_obj2nid(x->sig_alg->algorithm); 328} 329