Cryptlib/OpenSSL/crypto/x509/x_pubkey.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/asn1t.h>
  13 #include <openssl/x509.h>
  14 #include "internal/asn1_int.h"
  15 #include "internal/evp_int.h"
  16 #include "internal/x509_int.h"
  17 #include <openssl/rsa.h>
  18 #include <openssl/dsa.h>
  19
  20 struct X509_pubkey_st {
  21     X509_ALGOR *algor;
  22     ASN1_BIT_STRING *public_key;
  23     EVP_PKEY *pkey;
  24 };
  25
  26 static int x509_pubkey_decode(EVP_PKEY **pk, X509_PUBKEY *key);
  27
  28 /* Minor tweak to operation: free up EVP_PKEY */
  29 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  30                      void *exarg)
  31 {
  32     if (operation == ASN1_OP_FREE_POST) {
  33         X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  34         EVP_PKEY_free(pubkey->pkey);
  35     } else if (operation == ASN1_OP_D2I_POST) {
  36         /* Attempt to decode public key and cache in pubkey structure. */
  37         X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  38         EVP_PKEY_free(pubkey->pkey);
  39         /*
  40          * Opportunistically decode the key but remove any non fatal errors
  41          * from the queue. Subsequent explicit attempts to decode/use the key
  42          * will return an appropriate error.
  43          */
  44         ERR_set_mark();
  45         if (x509_pubkey_decode(&pubkey->pkey, pubkey) == -1)
  46             return 0;
  47         ERR_pop_to_mark();
  48     }
  49     return 1;
  50 }
  51
  52 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  53         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  54         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  55 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  56
  57 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  58
  59 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
  60 {
  61     X509_PUBKEY *pk = NULL;
  62
  63     if (x == NULL)
  64         return (0);
  65
  66     if ((pk = X509_PUBKEY_new()) == NULL)
  67         goto error;
  68
  69     if (pkey->ameth) {
  70         if (pkey->ameth->pub_encode) {
  71             if (!pkey->ameth->pub_encode(pk, pkey)) {
  72                 X509err(X509_F_X509_PUBKEY_SET,
  73                         X509_R_PUBLIC_KEY_ENCODE_ERROR);
  74                 goto error;
  75             }
  76         } else {
  77             X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
  78             goto error;
  79         }
  80     } else {
  81         X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
  82         goto error;
  83     }
  84
  85     X509_PUBKEY_free(*x);
  86     *x = pk;
  87     pk->pkey = pkey;
  88     EVP_PKEY_up_ref(pkey);
  89     return 1;
  90
  91  error:
  92     X509_PUBKEY_free(pk);
  93     return 0;
  94 }
  95
  96 /*
  97  * Attempt to decode a public key.
  98  * Returns 1 on success, 0 for a decode failure and -1 for a fatal
  99  * error e.g. malloc failure.
 100  */
 101
 102
 103 static int x509_pubkey_decode(EVP_PKEY **ppkey, X509_PUBKEY *key)
 104     {
 105     EVP_PKEY *pkey = EVP_PKEY_new();
 106
 107     if (pkey == NULL) {
 108         X509err(X509_F_X509_PUBKEY_DECODE, ERR_R_MALLOC_FAILURE);
 109         return -1;
 110     }
 111
 112     if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(key->algor->algorithm))) {
 113         X509err(X509_F_X509_PUBKEY_DECODE, X509_R_UNSUPPORTED_ALGORITHM);
 114         goto error;
 115     }
 116
 117     if (pkey->ameth->pub_decode) {
 118         /*
 119          * Treat any failure of pub_decode as a decode error. In
 120          * future we could have different return codes for decode
 121          * errors and fatal errors such as malloc failure.
 122          */
 123         if (!pkey->ameth->pub_decode(pkey, key)) {
 124             X509err(X509_F_X509_PUBKEY_DECODE, X509_R_PUBLIC_KEY_DECODE_ERROR);
 125             goto error;
 126         }
 127     } else {
 128         X509err(X509_F_X509_PUBKEY_DECODE, X509_R_METHOD_NOT_SUPPORTED);
 129         goto error;
 130     }
 131
 132     *ppkey = pkey;
 133     return 1;
 134
 135  error:
 136     EVP_PKEY_free(pkey);
 137     return 0;
 138 }
 139
 140 EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key)
 141 {
 142     EVP_PKEY *ret = NULL;
 143
 144     if (key == NULL || key->public_key == NULL)
 145         return NULL;
 146
 147     if (key->pkey != NULL)
 148         return key->pkey;
 149
 150     /*
 151      * When the key ASN.1 is initially parsed an attempt is made to
 152      * decode the public key and cache the EVP_PKEY structure. If this
 153      * operation fails the cached value will be NULL. Parsing continues
 154      * to allow parsing of unknown key types or unsupported forms.
 155      * We repeat the decode operation so the appropriate errors are left
 156      * in the queue.
 157      */
 158     x509_pubkey_decode(&ret, key);
 159     /* If decode doesn't fail something bad happened */
 160     if (ret != NULL) {
 161         X509err(X509_F_X509_PUBKEY_GET0, ERR_R_INTERNAL_ERROR);
 162         EVP_PKEY_free(ret);
 163     }
 164
 165     return NULL;
 166 }
 167
 168 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 169 {
 170     EVP_PKEY *ret = X509_PUBKEY_get0(key);
 171     if (ret != NULL)
 172         EVP_PKEY_up_ref(ret);
 173     return ret;
 174 }
 175
 176 /*
 177  * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
 178  * decode as X509_PUBKEY
 179  */
 180
 181 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
 182 {
 183     X509_PUBKEY *xpk;
 184     EVP_PKEY *pktmp;
 185     const unsigned char *q;
 186     q = *pp;
 187     xpk = d2i_X509_PUBKEY(NULL, &q, length);
 188     if (!xpk)
 189         return NULL;
 190     pktmp = X509_PUBKEY_get(xpk);
 191     X509_PUBKEY_free(xpk);
 192     if (!pktmp)
 193         return NULL;
 194     *pp = q;
 195     if (a) {
 196         EVP_PKEY_free(*a);
 197         *a = pktmp;
 198     }
 199     return pktmp;
 200 }
 201
 202 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 203 {
 204     X509_PUBKEY *xpk = NULL;
 205     int ret;
 206     if (!a)
 207         return 0;
 208     if (!X509_PUBKEY_set(&xpk, a))
 209         return 0;
 210     ret = i2d_X509_PUBKEY(xpk, pp);
 211     X509_PUBKEY_free(xpk);
 212     return ret;
 213 }
 214
 215 /*
 216  * The following are equivalents but which return RSA and DSA keys
 217  */
 218 #ifndef OPENSSL_NO_RSA
 219 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
 220 {
 221     EVP_PKEY *pkey;
 222     RSA *key;
 223     const unsigned char *q;
 224     q = *pp;
 225     pkey = d2i_PUBKEY(NULL, &q, length);
 226     if (!pkey)
 227         return NULL;
 228     key = EVP_PKEY_get1_RSA(pkey);
 229     EVP_PKEY_free(pkey);
 230     if (!key)
 231         return NULL;
 232     *pp = q;
 233     if (a) {
 234         RSA_free(*a);
 235         *a = key;
 236     }
 237     return key;
 238 }
 239
 240 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 241 {
 242     EVP_PKEY *pktmp;
 243     int ret;
 244     if (!a)
 245         return 0;
 246     pktmp = EVP_PKEY_new();
 247     if (pktmp == NULL) {
 248         ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 249         return 0;
 250     }
 251     EVP_PKEY_set1_RSA(pktmp, a);
 252     ret = i2d_PUBKEY(pktmp, pp);
 253     EVP_PKEY_free(pktmp);
 254     return ret;
 255 }
 256 #endif
 257
 258 #ifndef OPENSSL_NO_DSA
 259 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
 260 {
 261     EVP_PKEY *pkey;
 262     DSA *key;
 263     const unsigned char *q;
 264     q = *pp;
 265     pkey = d2i_PUBKEY(NULL, &q, length);
 266     if (!pkey)
 267         return NULL;
 268     key = EVP_PKEY_get1_DSA(pkey);
 269     EVP_PKEY_free(pkey);
 270     if (!key)
 271         return NULL;
 272     *pp = q;
 273     if (a) {
 274         DSA_free(*a);
 275         *a = key;
 276     }
 277     return key;
 278 }
 279
 280 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 281 {
 282     EVP_PKEY *pktmp;
 283     int ret;
 284     if (!a)
 285         return 0;
 286     pktmp = EVP_PKEY_new();
 287     if (pktmp == NULL) {
 288         ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 289         return 0;
 290     }
 291     EVP_PKEY_set1_DSA(pktmp, a);
 292     ret = i2d_PUBKEY(pktmp, pp);
 293     EVP_PKEY_free(pktmp);
 294     return ret;
 295 }
 296 #endif
 297
 298 #ifndef OPENSSL_NO_EC
 299 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 300 {
 301     EVP_PKEY *pkey;
 302     EC_KEY *key;
 303     const unsigned char *q;
 304     q = *pp;
 305     pkey = d2i_PUBKEY(NULL, &q, length);
 306     if (!pkey)
 307         return (NULL);
 308     key = EVP_PKEY_get1_EC_KEY(pkey);
 309     EVP_PKEY_free(pkey);
 310     if (!key)
 311         return (NULL);
 312     *pp = q;
 313     if (a) {
 314         EC_KEY_free(*a);
 315         *a = key;
 316     }
 317     return (key);
 318 }
 319
 320 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 321 {
 322     EVP_PKEY *pktmp;
 323     int ret;
 324     if (!a)
 325         return (0);
 326     if ((pktmp = EVP_PKEY_new()) == NULL) {
 327         ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 328         return (0);
 329     }
 330     EVP_PKEY_set1_EC_KEY(pktmp, a);
 331     ret = i2d_PUBKEY(pktmp, pp);
 332     EVP_PKEY_free(pktmp);
 333     return (ret);
 334 }
 335 #endif
 336
 337 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, 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         OPENSSL_free(pub->public_key->data);
 345         pub->public_key->data = penc;
 346         pub->public_key->length = penclen;
 347         /* Set number of unused bits to zero */
 348         pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 349         pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 350     }
 351     return 1;
 352 }
 353
 354 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
 355                            const unsigned char **pk, int *ppklen,
 356                            X509_ALGOR **pa, X509_PUBKEY *pub)
 357 {
 358     if (ppkalg)
 359         *ppkalg = pub->algor->algorithm;
 360     if (pk) {
 361         *pk = pub->public_key->data;
 362         *ppklen = pub->public_key->length;
 363     }
 364     if (pa)
 365         *pa = pub->algor;
 366     return 1;
 367 }
 368
 369 ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
 370 {
 371     if (x == NULL)
 372         return NULL;
 373     return x->cert_info.key->public_key;
 374 }