lib/libcrypto/pem/pem_pkey.c

   1 /* $OpenBSD: pem_pkey.c,v 1.23 2017/05/02 03:59:44 deraadt 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 #include <string.h>
  61
  62 #include <openssl/opensslconf.h>
  63
  64 #include <openssl/buffer.h>
  65 #include <openssl/err.h>
  66 #include <openssl/evp.h>
  67 #include <openssl/objects.h>
  68 #include <openssl/pem.h>
  69 #include <openssl/pkcs12.h>
  70 #include <openssl/x509.h>
  71
  72 #ifndef OPENSSL_NO_ENGINE
  73 #include <openssl/engine.h>
  74 #endif
  75
  76 #include "asn1_locl.h"
  77
  78 int pem_check_suffix(const char *pem_str, const char *suffix);
  79
  80 EVP_PKEY *
  81 PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u)
  82 {
  83         char *nm = NULL;
  84         const unsigned char *p = NULL;
  85         unsigned char *data = NULL;
  86         long len;
  87         int slen;
  88         EVP_PKEY *ret = NULL;
  89
  90         if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_EVP_PKEY,
  91             bp, cb, u))
  92                 return NULL;
  93         p = data;
  94
  95         if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) {
  96                 PKCS8_PRIV_KEY_INFO *p8inf;
  97                 p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len);
  98                 if (!p8inf)
  99                         goto p8err;
 100                 ret = EVP_PKCS82PKEY(p8inf);
 101                 if (x) {
 102                         EVP_PKEY_free(*x);
 103                         *x = ret;
 104                 }
 105                 PKCS8_PRIV_KEY_INFO_free(p8inf);
 106         } else if (strcmp(nm, PEM_STRING_PKCS8) == 0) {
 107                 PKCS8_PRIV_KEY_INFO *p8inf;
 108                 X509_SIG *p8;
 109                 int klen;
 110                 char psbuf[PEM_BUFSIZE];
 111                 p8 = d2i_X509_SIG(NULL, &p, len);
 112                 if (!p8)
 113                         goto p8err;
 114                 if (cb)
 115                         klen = cb(psbuf, PEM_BUFSIZE, 0, u);
 116                 else
 117                         klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
 118                 if (klen <= 0) {
 119                         PEMerror(PEM_R_BAD_PASSWORD_READ);
 120                         X509_SIG_free(p8);
 121                         goto err;
 122                 }
 123                 p8inf = PKCS8_decrypt(p8, psbuf, klen);
 124                 X509_SIG_free(p8);
 125                 if (!p8inf)
 126                         goto p8err;
 127                 ret = EVP_PKCS82PKEY(p8inf);
 128                 if (x) {
 129                         EVP_PKEY_free(*x);
 130                         *x = ret;
 131                 }
 132                 PKCS8_PRIV_KEY_INFO_free(p8inf);
 133         } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0) {
 134                 const EVP_PKEY_ASN1_METHOD *ameth;
 135                 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
 136                 if (!ameth || !ameth->old_priv_decode)
 137                         goto p8err;
 138                 ret = d2i_PrivateKey(ameth->pkey_id, x, &p, len);
 139         }
 140
 141 p8err:
 142         if (ret == NULL)
 143                 PEMerror(ERR_R_ASN1_LIB);
 144 err:
 145         free(nm);
 146         freezero(data, len);
 147         return (ret);
 148 }
 149
 150 int
 151 PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
 152     unsigned char *kstr, int klen, pem_password_cb *cb, void *u)
 153 {
 154         char pem_str[80];
 155
 156         if (!x->ameth || x->ameth->priv_encode)
 157                 return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,
 158                     (char *)kstr, klen, cb, u);
 159
 160         (void) snprintf(pem_str, sizeof(pem_str), "%s PRIVATE KEY",
 161             x->ameth->pem_str);
 162         return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
 163             pem_str, bp, x, enc, kstr, klen, cb, u);
 164 }
 165
 166 EVP_PKEY *
 167 PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
 168 {
 169         char *nm = NULL;
 170         const unsigned char *p = NULL;
 171         unsigned char *data = NULL;
 172         long len;
 173         int slen;
 174         EVP_PKEY *ret = NULL;
 175
 176         if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS,
 177             bp, 0, NULL))
 178                 return NULL;
 179         p = data;
 180
 181         if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0) {
 182                 ret = EVP_PKEY_new();
 183                 if (!ret)
 184                         goto err;
 185                 if (!EVP_PKEY_set_type_str(ret, nm, slen) ||
 186                     !ret->ameth->param_decode ||
 187                     !ret->ameth->param_decode(ret, &p, len)) {
 188                         EVP_PKEY_free(ret);
 189                         ret = NULL;
 190                         goto err;
 191                 }
 192                 if (x) {
 193                         EVP_PKEY_free(*x);
 194                         *x = ret;
 195                 }
 196         }
 197
 198 err:
 199         if (ret == NULL)
 200                 PEMerror(ERR_R_ASN1_LIB);
 201         free(nm);
 202         free(data);
 203         return (ret);
 204 }
 205
 206 int
 207 PEM_write_bio_Parameters(BIO *bp, EVP_PKEY *x)
 208 {
 209         char pem_str[80];
 210
 211         if (!x->ameth || !x->ameth->param_encode)
 212                 return 0;
 213
 214         (void) snprintf(pem_str, sizeof(pem_str), "%s PARAMETERS",
 215             x->ameth->pem_str);
 216         return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,
 217             pem_str, bp, x, NULL, NULL, 0, 0, NULL);
 218 }
 219
 220 EVP_PKEY *
 221 PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u)
 222 {
 223         BIO *b;
 224         EVP_PKEY *ret;
 225
 226         if ((b = BIO_new(BIO_s_file())) == NULL) {
 227                 PEMerror(ERR_R_BUF_LIB);
 228                 return (0);
 229         }
 230         BIO_set_fp(b, fp, BIO_NOCLOSE);
 231         ret = PEM_read_bio_PrivateKey(b, x, cb, u);
 232         BIO_free(b);
 233         return (ret);
 234 }
 235
 236 int
 237 PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
 238     unsigned char *kstr, int klen, pem_password_cb *cb, void *u)
 239 {
 240         BIO *b;
 241         int ret;
 242
 243         if ((b = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 244                 PEMerror(ERR_R_BUF_LIB);
 245                 return 0;
 246         }
 247         ret = PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u);
 248         BIO_free(b);
 249         return ret;
 250 }
 251