1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/x509.h> 58 59 #include <limits.h> 60 61 #include <openssl/asn1.h> 62 #include <openssl/asn1t.h> 63 #include <openssl/bytestring.h> 64 #include <openssl/err.h> 65 #include <openssl/evp.h> 66 #include <openssl/mem.h> 67 #include <openssl/obj.h> 68 #include <openssl/thread.h> 69 70 #include "../internal.h" 71 72 /* Minor tweak to operation: free up EVP_PKEY */ 73 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 74 void *exarg) 75 { 76 if (operation == ASN1_OP_FREE_POST) { 77 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval; 78 EVP_PKEY_free(pubkey->pkey); 79 } 80 return 1; 81 } 82 83 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = { 84 ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR), 85 ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING) 86 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY) 87 88 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY) 89 90 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey) 91 { 92 X509_PUBKEY *pk = NULL; 93 uint8_t *spki = NULL; 94 size_t spki_len; 95 96 if (x == NULL) 97 return (0); 98 99 CBB cbb; 100 if (!CBB_init(&cbb, 0) || 101 !EVP_marshal_public_key(&cbb, pkey) || 102 !CBB_finish(&cbb, &spki, &spki_len) || 103 spki_len > LONG_MAX) { 104 CBB_cleanup(&cbb); 105 OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_ENCODE_ERROR); 106 goto error; 107 } 108 109 const uint8_t *p = spki; 110 pk = d2i_X509_PUBKEY(NULL, &p, (long)spki_len); 111 if (pk == NULL || p != spki + spki_len) { 112 OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_DECODE_ERROR); 113 goto error; 114 } 115 116 OPENSSL_free(spki); 117 X509_PUBKEY_free(*x); 118 *x = pk; 119 120 return 1; 121 error: 122 X509_PUBKEY_free(pk); 123 OPENSSL_free(spki); 124 return 0; 125 } 126 127 /* g_pubkey_lock is used to protect the initialisation of the |pkey| member of 128 * |X509_PUBKEY| objects. Really |X509_PUBKEY| should have a |CRYPTO_once_t| 129 * inside it for this, but |CRYPTO_once_t| is private and |X509_PUBKEY| is 130 * not. */ 131 static struct CRYPTO_STATIC_MUTEX g_pubkey_lock = CRYPTO_STATIC_MUTEX_INIT; 132 133 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key) 134 { 135 EVP_PKEY *ret = NULL; 136 uint8_t *spki = NULL; 137 138 if (key == NULL) 139 goto error; 140 141 CRYPTO_STATIC_MUTEX_lock_read(&g_pubkey_lock); 142 if (key->pkey != NULL) { 143 CRYPTO_STATIC_MUTEX_unlock_read(&g_pubkey_lock); 144 EVP_PKEY_up_ref(key->pkey); 145 return key->pkey; 146 } 147 CRYPTO_STATIC_MUTEX_unlock_read(&g_pubkey_lock); 148 149 /* Re-encode the |X509_PUBKEY| to DER and parse it. */ 150 int spki_len = i2d_X509_PUBKEY(key, &spki); 151 if (spki_len < 0) { 152 goto error; 153 } 154 CBS cbs; 155 CBS_init(&cbs, spki, (size_t)spki_len); 156 ret = EVP_parse_public_key(&cbs); 157 if (ret == NULL || CBS_len(&cbs) != 0) { 158 OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_DECODE_ERROR); 159 goto error; 160 } 161 162 /* Check to see if another thread set key->pkey first */ 163 CRYPTO_STATIC_MUTEX_lock_write(&g_pubkey_lock); 164 if (key->pkey) { 165 CRYPTO_STATIC_MUTEX_unlock_write(&g_pubkey_lock); 166 EVP_PKEY_free(ret); 167 ret = key->pkey; 168 } else { 169 key->pkey = ret; 170 CRYPTO_STATIC_MUTEX_unlock_write(&g_pubkey_lock); 171 } 172 173 OPENSSL_free(spki); 174 EVP_PKEY_up_ref(ret); 175 return ret; 176 177 error: 178 OPENSSL_free(spki); 179 EVP_PKEY_free(ret); 180 return NULL; 181 } 182 183 /* 184 * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or 185 * decode as X509_PUBKEY 186 */ 187 188 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length) 189 { 190 X509_PUBKEY *xpk; 191 EVP_PKEY *pktmp; 192 xpk = d2i_X509_PUBKEY(NULL, pp, length); 193 if (!xpk) 194 return NULL; 195 pktmp = X509_PUBKEY_get(xpk); 196 X509_PUBKEY_free(xpk); 197 if (!pktmp) 198 return NULL; 199 if (a) { 200 EVP_PKEY_free(*a); 201 *a = pktmp; 202 } 203 return pktmp; 204 } 205 206 int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp) 207 { 208 X509_PUBKEY *xpk = NULL; 209 int ret; 210 if (!a) 211 return 0; 212 if (!X509_PUBKEY_set(&xpk, (EVP_PKEY *)a)) 213 return 0; 214 ret = i2d_X509_PUBKEY(xpk, pp); 215 X509_PUBKEY_free(xpk); 216 return ret; 217 } 218 219 /* 220 * The following are equivalents but which return RSA and DSA keys 221 */ 222 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length) 223 { 224 EVP_PKEY *pkey; 225 RSA *key; 226 const unsigned char *q; 227 q = *pp; 228 pkey = d2i_PUBKEY(NULL, &q, length); 229 if (!pkey) 230 return NULL; 231 key = EVP_PKEY_get1_RSA(pkey); 232 EVP_PKEY_free(pkey); 233 if (!key) 234 return NULL; 235 *pp = q; 236 if (a) { 237 RSA_free(*a); 238 *a = key; 239 } 240 return key; 241 } 242 243 int i2d_RSA_PUBKEY(const RSA *a, unsigned char **pp) 244 { 245 EVP_PKEY *pktmp; 246 int ret; 247 if (!a) 248 return 0; 249 pktmp = EVP_PKEY_new(); 250 if (!pktmp) { 251 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 252 return 0; 253 } 254 EVP_PKEY_set1_RSA(pktmp, (RSA *)a); 255 ret = i2d_PUBKEY(pktmp, pp); 256 EVP_PKEY_free(pktmp); 257 return ret; 258 } 259 260 #ifndef OPENSSL_NO_DSA 261 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length) 262 { 263 EVP_PKEY *pkey; 264 DSA *key; 265 const unsigned char *q; 266 q = *pp; 267 pkey = d2i_PUBKEY(NULL, &q, length); 268 if (!pkey) 269 return NULL; 270 key = EVP_PKEY_get1_DSA(pkey); 271 EVP_PKEY_free(pkey); 272 if (!key) 273 return NULL; 274 *pp = q; 275 if (a) { 276 DSA_free(*a); 277 *a = key; 278 } 279 return key; 280 } 281 282 int i2d_DSA_PUBKEY(const DSA *a, unsigned char **pp) 283 { 284 EVP_PKEY *pktmp; 285 int ret; 286 if (!a) 287 return 0; 288 pktmp = EVP_PKEY_new(); 289 if (!pktmp) { 290 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 291 return 0; 292 } 293 EVP_PKEY_set1_DSA(pktmp, (DSA *)a); 294 ret = i2d_PUBKEY(pktmp, pp); 295 EVP_PKEY_free(pktmp); 296 return ret; 297 } 298 #endif 299 300 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length) 301 { 302 EVP_PKEY *pkey; 303 EC_KEY *key; 304 const unsigned char *q; 305 q = *pp; 306 pkey = d2i_PUBKEY(NULL, &q, length); 307 if (!pkey) 308 return (NULL); 309 key = EVP_PKEY_get1_EC_KEY(pkey); 310 EVP_PKEY_free(pkey); 311 if (!key) 312 return (NULL); 313 *pp = q; 314 if (a) { 315 EC_KEY_free(*a); 316 *a = key; 317 } 318 return (key); 319 } 320 321 int i2d_EC_PUBKEY(const EC_KEY *a, unsigned char **pp) 322 { 323 EVP_PKEY *pktmp; 324 int ret; 325 if (!a) 326 return (0); 327 if ((pktmp = EVP_PKEY_new()) == NULL) { 328 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 329 return (0); 330 } 331 EVP_PKEY_set1_EC_KEY(pktmp, (EC_KEY *)a); 332 ret = i2d_PUBKEY(pktmp, pp); 333 EVP_PKEY_free(pktmp); 334 return (ret); 335 } 336 337 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, const ASN1_OBJECT *aobj, 338 int ptype, void *pval, 339 unsigned char *penc, int penclen) 340 { 341 if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval)) 342 return 0; 343 if (penc) { 344 if (pub->public_key->data) 345 OPENSSL_free(pub->public_key->data); 346 pub->public_key->data = penc; 347 pub->public_key->length = penclen; 348 /* Set number of unused bits to zero */ 349 pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 350 pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT; 351 } 352 return 1; 353 } 354 355 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg, 356 const unsigned char **pk, int *ppklen, 357 X509_ALGOR **pa, X509_PUBKEY *pub) 358 { 359 if (ppkalg) 360 *ppkalg = pub->algor->algorithm; 361 if (pk) { 362 *pk = pub->public_key->data; 363 *ppklen = pub->public_key->length; 364 } 365 if (pa) 366 *pa = pub->algor; 367 return 1; 368 } 369
