crypto/pem/pem_pkey.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/buffer.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/rand.h>
  16 #include <openssl/x509.h>
  17 #include <openssl/pkcs12.h>
  18 #include <openssl/pem.h>
  19 #include <openssl/engine.h>
  20 #include <openssl/dh.h>
  21 #include "internal/asn1_int.h"
  22 #include "internal/evp_int.h"
  23
  24 int pem_check_suffix(const char *pem_str, const char *suffix);
  25
  26 EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
  27                                   void *u)
  28 {
  29     char *nm = NULL;
  30     const unsigned char *p = NULL;
  31     unsigned char *data = NULL;
  32     long len;
  33     int slen;
  34     EVP_PKEY *ret = NULL;
  35
  36     if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_EVP_PKEY, bp, cb, u))
  37         return NULL;
  38     p = data;
  39
  40     if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) {
  41         PKCS8_PRIV_KEY_INFO *p8inf;
  42         p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len);
  43         if (!p8inf)
  44             goto p8err;
  45         ret = EVP_PKCS82PKEY(p8inf);
  46         if (x) {
  47             EVP_PKEY_free((EVP_PKEY *)*x);
  48             *x = ret;
  49         }
  50         PKCS8_PRIV_KEY_INFO_free(p8inf);
  51     } else if (strcmp(nm, PEM_STRING_PKCS8) == 0) {
  52         PKCS8_PRIV_KEY_INFO *p8inf;
  53         X509_SIG *p8;
  54         int klen;
  55         char psbuf[PEM_BUFSIZE];
  56         p8 = d2i_X509_SIG(NULL, &p, len);
  57         if (!p8)
  58             goto p8err;
  59         if (cb)
  60             klen = cb(psbuf, PEM_BUFSIZE, 0, u);
  61         else
  62             klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
  63         if (klen <= 0) {
  64             PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY, PEM_R_BAD_PASSWORD_READ);
  65             X509_SIG_free(p8);
  66             goto err;
  67         }
  68         p8inf = PKCS8_decrypt(p8, psbuf, klen);
  69         X509_SIG_free(p8);
  70         if (!p8inf)
  71             goto p8err;
  72         ret = EVP_PKCS82PKEY(p8inf);
  73         if (x) {
  74             EVP_PKEY_free((EVP_PKEY *)*x);
  75             *x = ret;
  76         }
  77         PKCS8_PRIV_KEY_INFO_free(p8inf);
  78     } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0) {
  79         const EVP_PKEY_ASN1_METHOD *ameth;
  80         ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
  81         if (!ameth || !ameth->old_priv_decode)
  82             goto p8err;
  83         ret = d2i_PrivateKey(ameth->pkey_id, x, &p, len);
  84     }
  85  p8err:
  86     if (ret == NULL)
  87         PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY, ERR_R_ASN1_LIB);
  88  err:
  89     OPENSSL_free(nm);
  90     OPENSSL_clear_free(data, len);
  91     return (ret);
  92 }
  93
  94 int PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
  95                              unsigned char *kstr, int klen,
  96                              pem_password_cb *cb, void *u)
  97 {
  98     char pem_str[80];
  99     if (!x->ameth || x->ameth->priv_encode)
 100         return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,
 101                                              (char *)kstr, klen, cb, u);
 102
 103     BIO_snprintf(pem_str, 80, "%s PRIVATE KEY", x->ameth->pem_str);
 104     return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
 105                               pem_str, bp, x, enc, kstr, klen, cb, u);
 106 }
 107
 108 EVP_PKEY *PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
 109 {
 110     char *nm = NULL;
 111     const unsigned char *p = NULL;
 112     unsigned char *data = NULL;
 113     long len;
 114     int slen;
 115     EVP_PKEY *ret = NULL;
 116
 117     if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS,
 118                             bp, 0, NULL))
 119         return NULL;
 120     p = data;
 121
 122     if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0) {
 123         ret = EVP_PKEY_new();
 124         if (ret == NULL)
 125             goto err;
 126         if (!EVP_PKEY_set_type_str(ret, nm, slen)
 127             || !ret->ameth->param_decode
 128             || !ret->ameth->param_decode(ret, &p, len)) {
 129             EVP_PKEY_free(ret);
 130             ret = NULL;
 131             goto err;
 132         }
 133         if (x) {
 134             EVP_PKEY_free((EVP_PKEY *)*x);
 135             *x = ret;
 136         }
 137     }
 138  err:
 139     if (ret == NULL)
 140         PEMerr(PEM_F_PEM_READ_BIO_PARAMETERS, ERR_R_ASN1_LIB);
 141     OPENSSL_free(nm);
 142     OPENSSL_free(data);
 143     return (ret);
 144 }
 145
 146 int PEM_write_bio_Parameters(BIO *bp, EVP_PKEY *x)
 147 {
 148     char pem_str[80];
 149     if (!x->ameth || !x->ameth->param_encode)
 150         return 0;
 151
 152     BIO_snprintf(pem_str, 80, "%s PARAMETERS", x->ameth->pem_str);
 153     return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,
 154                               pem_str, bp, x, NULL, NULL, 0, 0, NULL);
 155 }
 156
 157 #ifndef OPENSSL_NO_STDIO
 158 EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
 159                               void *u)
 160 {
 161     BIO *b;
 162     EVP_PKEY *ret;
 163
 164     if ((b = BIO_new(BIO_s_file())) == NULL) {
 165         PEMerr(PEM_F_PEM_READ_PRIVATEKEY, ERR_R_BUF_LIB);
 166         return (0);
 167     }
 168     BIO_set_fp(b, fp, BIO_NOCLOSE);
 169     ret = PEM_read_bio_PrivateKey(b, x, cb, u);
 170     BIO_free(b);
 171     return (ret);
 172 }
 173
 174 int PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
 175                          unsigned char *kstr, int klen,
 176                          pem_password_cb *cb, void *u)
 177 {
 178     BIO *b;
 179     int ret;
 180
 181     if ((b = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 182         PEMerr(PEM_F_PEM_WRITE_PRIVATEKEY, ERR_R_BUF_LIB);
 183         return 0;
 184     }
 185     ret = PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u);
 186     BIO_free(b);
 187     return ret;
 188 }
 189
 190 #endif
 191
 192 #ifndef OPENSSL_NO_DH
 193
 194 /* Transparently read in PKCS#3 or X9.42 DH parameters */
 195
 196 DH *PEM_read_bio_DHparams(BIO *bp, DH **x, pem_password_cb *cb, void *u)
 197 {
 198     char *nm = NULL;
 199     const unsigned char *p = NULL;
 200     unsigned char *data = NULL;
 201     long len;
 202     DH *ret = NULL;
 203
 204     if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_DHPARAMS, bp, cb, u))
 205         return NULL;
 206     p = data;
 207
 208     if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0)
 209         ret = d2i_DHxparams(x, &p, len);
 210     else
 211         ret = d2i_DHparams(x, &p, len);
 212
 213     if (ret == NULL)
 214         PEMerr(PEM_F_PEM_READ_BIO_DHPARAMS, ERR_R_ASN1_LIB);
 215     OPENSSL_free(nm);
 216     OPENSSL_free(data);
 217     return ret;
 218 }
 219
 220 # ifndef OPENSSL_NO_STDIO
 221 DH *PEM_read_DHparams(FILE *fp, DH **x, pem_password_cb *cb, void *u)
 222 {
 223     BIO *b;
 224     DH *ret;
 225
 226     if ((b = BIO_new(BIO_s_file())) == NULL) {
 227         PEMerr(PEM_F_PEM_READ_DHPARAMS, ERR_R_BUF_LIB);
 228         return (0);
 229     }
 230     BIO_set_fp(b, fp, BIO_NOCLOSE);
 231     ret = PEM_read_bio_DHparams(b, x, cb, u);
 232     BIO_free(b);
 233     return (ret);
 234 }
 235 # endif
 236
 237 #endif