crypto/pem/pem_pkey.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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/x509.h>
  16 #include <openssl/pkcs12.h>
  17 #include <openssl/pem.h>
  18 #include <openssl/engine.h>
  19 #include <openssl/dh.h>
  20 #include "internal/asn1_int.h"
  21 #include "internal/evp_int.h"
  22
  23 int pem_check_suffix(const char *pem_str, const char *suffix);
  24
  25 EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
  26                                   void *u)
  27 {
  28     char *nm = NULL;
  29     const unsigned char *p = NULL;
  30     unsigned char *data = NULL;
  31     long len;
  32     int slen;
  33     EVP_PKEY *ret = NULL;
  34
  35     if (!PEM_bytes_read_bio_secmem(&data, &len, &nm, PEM_STRING_EVP_PKEY, bp,
  36                                    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         OPENSSL_cleanse(psbuf, klen);
  71         if (!p8inf)
  72             goto p8err;
  73         ret = EVP_PKCS82PKEY(p8inf);
  74         if (x) {
  75             EVP_PKEY_free((EVP_PKEY *)*x);
  76             *x = ret;
  77         }
  78         PKCS8_PRIV_KEY_INFO_free(p8inf);
  79     } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0) {
  80         const EVP_PKEY_ASN1_METHOD *ameth;
  81         ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
  82         if (!ameth || !ameth->old_priv_decode)
  83             goto p8err;
  84         ret = d2i_PrivateKey(ameth->pkey_id, x, &p, len);
  85     }
  86  p8err:
  87     if (ret == NULL)
  88         PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY, ERR_R_ASN1_LIB);
  89  err:
  90     OPENSSL_secure_free(nm);
  91     OPENSSL_secure_clear_free(data, len);
  92     return ret;
  93 }
  94
  95 int PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
  96                              unsigned char *kstr, int klen,
  97                              pem_password_cb *cb, void *u)
  98 {
  99     if (x->ameth == NULL || x->ameth->priv_encode != NULL)
 100         return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,
 101                                              (char *)kstr, klen, cb, u);
 102     return PEM_write_bio_PrivateKey_traditional(bp, x, enc, kstr, klen, cb, u);
 103 }
 104
 105 int PEM_write_bio_PrivateKey_traditional(BIO *bp, EVP_PKEY *x,
 106                                          const EVP_CIPHER *enc,
 107                                          unsigned char *kstr, int klen,
 108                                          pem_password_cb *cb, void *u)
 109 {
 110     char pem_str[80];
 111     BIO_snprintf(pem_str, 80, "%s PRIVATE KEY", x->ameth->pem_str);
 112     return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
 113                               pem_str, bp, x, enc, kstr, klen, cb, u);
 114 }
 115
 116 EVP_PKEY *PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
 117 {
 118     char *nm = NULL;
 119     const unsigned char *p = NULL;
 120     unsigned char *data = NULL;
 121     long len;
 122     int slen;
 123     EVP_PKEY *ret = NULL;
 124
 125     if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS,
 126                             bp, 0, NULL))
 127         return NULL;
 128     p = data;
 129
 130     if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0) {
 131         ret = EVP_PKEY_new();
 132         if (ret == NULL)
 133             goto err;
 134         if (!EVP_PKEY_set_type_str(ret, nm, slen)
 135             || !ret->ameth->param_decode
 136             || !ret->ameth->param_decode(ret, &p, len)) {
 137             EVP_PKEY_free(ret);
 138             ret = NULL;
 139             goto err;
 140         }
 141         if (x) {
 142             EVP_PKEY_free((EVP_PKEY *)*x);
 143             *x = ret;
 144         }
 145     }
 146  err:
 147     if (ret == NULL)
 148         PEMerr(PEM_F_PEM_READ_BIO_PARAMETERS, ERR_R_ASN1_LIB);
 149     OPENSSL_free(nm);
 150     OPENSSL_free(data);
 151     return ret;
 152 }
 153
 154 int PEM_write_bio_Parameters(BIO *bp, EVP_PKEY *x)
 155 {
 156     char pem_str[80];
 157     if (!x->ameth || !x->ameth->param_encode)
 158         return 0;
 159
 160     BIO_snprintf(pem_str, 80, "%s PARAMETERS", x->ameth->pem_str);
 161     return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,
 162                               pem_str, bp, x, NULL, NULL, 0, 0, NULL);
 163 }
 164
 165 #ifndef OPENSSL_NO_STDIO
 166 EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
 167                               void *u)
 168 {
 169     BIO *b;
 170     EVP_PKEY *ret;
 171
 172     if ((b = BIO_new(BIO_s_file())) == NULL) {
 173         PEMerr(PEM_F_PEM_READ_PRIVATEKEY, ERR_R_BUF_LIB);
 174         return 0;
 175     }
 176     BIO_set_fp(b, fp, BIO_NOCLOSE);
 177     ret = PEM_read_bio_PrivateKey(b, x, cb, u);
 178     BIO_free(b);
 179     return ret;
 180 }
 181
 182 int PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
 183                          unsigned char *kstr, int klen,
 184                          pem_password_cb *cb, void *u)
 185 {
 186     BIO *b;
 187     int ret;
 188
 189     if ((b = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 190         PEMerr(PEM_F_PEM_WRITE_PRIVATEKEY, ERR_R_BUF_LIB);
 191         return 0;
 192     }
 193     ret = PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u);
 194     BIO_free(b);
 195     return ret;
 196 }
 197
 198 #endif
 199
 200 #ifndef OPENSSL_NO_DH
 201
 202 /* Transparently read in PKCS#3 or X9.42 DH parameters */
 203
 204 DH *PEM_read_bio_DHparams(BIO *bp, DH **x, pem_password_cb *cb, void *u)
 205 {
 206     char *nm = NULL;
 207     const unsigned char *p = NULL;
 208     unsigned char *data = NULL;
 209     long len;
 210     DH *ret = NULL;
 211
 212     if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_DHPARAMS, bp, cb, u))
 213         return NULL;
 214     p = data;
 215
 216     if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0)
 217         ret = d2i_DHxparams(x, &p, len);
 218     else
 219         ret = d2i_DHparams(x, &p, len);
 220
 221     if (ret == NULL)
 222         PEMerr(PEM_F_PEM_READ_BIO_DHPARAMS, ERR_R_ASN1_LIB);
 223     OPENSSL_free(nm);
 224     OPENSSL_free(data);
 225     return ret;
 226 }
 227
 228 # ifndef OPENSSL_NO_STDIO
 229 DH *PEM_read_DHparams(FILE *fp, DH **x, pem_password_cb *cb, void *u)
 230 {
 231     BIO *b;
 232     DH *ret;
 233
 234     if ((b = BIO_new(BIO_s_file())) == NULL) {
 235         PEMerr(PEM_F_PEM_READ_DHPARAMS, ERR_R_BUF_LIB);
 236         return 0;
 237     }
 238     BIO_set_fp(b, fp, BIO_NOCLOSE);
 239     ret = PEM_read_bio_DHparams(b, x, cb, u);
 240     BIO_free(b);
 241     return ret;
 242 }
 243 # endif
 244
 245 #endif