crypto/pem/pem_pk8.c

   1 /*
   2  * Copyright 1995-2020 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/core_dispatch.h>
  13 #include <openssl/buffer.h>
  14 #include <openssl/objects.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/x509.h>
  17 #include <openssl/pkcs12.h>
  18 #include <openssl/pem.h>
  19 #include <openssl/encoder.h>
  20
  21 static int do_pk8pkey(BIO *bp, const EVP_PKEY *x, int isder,
  22                       int nid, const EVP_CIPHER *enc,
  23                       const char *kstr, int klen,
  24                       pem_password_cb *cb, void *u,
  25                       OSSL_LIB_CTX *libctx, const char *propq);
  26
  27 #ifndef OPENSSL_NO_STDIO
  28 static int do_pk8pkey_fp(FILE *bp, const EVP_PKEY *x, int isder,
  29                          int nid, const EVP_CIPHER *enc,
  30                          const char *kstr, int klen,
  31                          pem_password_cb *cb, void *u,
  32                          OSSL_LIB_CTX *libctx, const char *propq);
  33 #endif
  34 /*
  35  * These functions write a private key in PKCS#8 format: it is a "drop in"
  36  * replacement for PEM_write_bio_PrivateKey() and friends. As usual if 'enc'
  37  * is NULL then it uses the unencrypted private key form. The 'nid' versions
  38  * uses PKCS#5 v1.5 PBE algorithms whereas the others use PKCS#5 v2.0.
  39  */
  40
  41 int PEM_write_bio_PKCS8PrivateKey_nid(BIO *bp, const EVP_PKEY *x, int nid,
  42                                       const char *kstr, int klen,
  43                                       pem_password_cb *cb, void *u)
  44 {
  45     return do_pk8pkey(bp, x, 0, nid, NULL, kstr, klen, cb, u, NULL, NULL);
  46 }
  47
  48 int PEM_write_bio_PKCS8PrivateKey(BIO *bp, const EVP_PKEY *x, const EVP_CIPHER *enc,
  49                                   const char *kstr, int klen,
  50                                   pem_password_cb *cb, void *u)
  51 {
  52     return do_pk8pkey(bp, x, 0, -1, enc, kstr, klen, cb, u, NULL, NULL);
  53 }
  54
  55 int i2d_PKCS8PrivateKey_bio(BIO *bp, const EVP_PKEY *x, const EVP_CIPHER *enc,
  56                             const char *kstr, int klen,
  57                             pem_password_cb *cb, void *u)
  58 {
  59     return do_pk8pkey(bp, x, 1, -1, enc, kstr, klen, cb, u, NULL, NULL);
  60 }
  61
  62 int i2d_PKCS8PrivateKey_nid_bio(BIO *bp, const EVP_PKEY *x, int nid,
  63                                 const char *kstr, int klen,
  64                                 pem_password_cb *cb, void *u)
  65 {
  66     return do_pk8pkey(bp, x, 1, nid, NULL, kstr, klen, cb, u, NULL, NULL);
  67 }
  68
  69 static int do_pk8pkey(BIO *bp, const EVP_PKEY *x, int isder, int nid,
  70                       const EVP_CIPHER *enc, const char *kstr, int klen,
  71                       pem_password_cb *cb, void *u,
  72                       OSSL_LIB_CTX *libctx, const char *propq)
  73 {
  74     int ret = 0;
  75     const char *outtype = isder ? "DER" : "PEM";
  76     OSSL_ENCODER_CTX *ctx =
  77         OSSL_ENCODER_CTX_new_by_EVP_PKEY(x, outtype, OSSL_KEYMGMT_SELECT_ALL,
  78                                          libctx, propq);
  79
  80     if (ctx == NULL)
  81         return 0;
  82
  83     /*
  84      * If no keystring or callback is set, OpenSSL traditionally uses the
  85      * user's cb argument as a password string, or if that's NULL, it falls
  86      * back on PEM_def_callback().
  87      */
  88     if (kstr == NULL && cb == NULL) {
  89         if (u != NULL) {
  90             kstr = u;
  91             klen = strlen(u);
  92         } else {
  93             cb = PEM_def_callback;
  94         }
  95     }
  96
  97     if (OSSL_ENCODER_CTX_get_num_encoders(ctx) != 0) {
  98         ret = 1;
  99         if (enc != NULL) {
 100             ret = 0;
 101             if (OSSL_ENCODER_CTX_set_cipher(ctx, EVP_CIPHER_name(enc), NULL)) {
 102                 const unsigned char *ukstr = (const unsigned char *)kstr;
 103
 104                 /*
 105                  * Try to pass the passphrase if one was given, or the
 106                  * passphrase callback if one was given.  If none of them
 107                  * are given and that's wrong, we rely on the _to_bio()
 108                  * call to generate errors.
 109                  */
 110                 ret = 1;
 111                 if (kstr != NULL
 112                     && !OSSL_ENCODER_CTX_set_passphrase(ctx, ukstr, klen))
 113                     ret = 0;
 114                 else if (cb != NULL
 115                          && !OSSL_ENCODER_CTX_set_pem_password_cb(ctx, cb, u))
 116                     ret = 0;
 117             }
 118         }
 119         ret = ret && OSSL_ENCODER_to_bio(ctx, bp);
 120     } else {
 121         X509_SIG *p8;
 122         PKCS8_PRIV_KEY_INFO *p8inf;
 123         char buf[PEM_BUFSIZE];
 124
 125         ret = 0;
 126         if ((p8inf = EVP_PKEY2PKCS8(x)) == NULL) {
 127             PEMerr(PEM_F_DO_PK8PKEY, PEM_R_ERROR_CONVERTING_PRIVATE_KEY);
 128             goto legacy_end;
 129         }
 130         if (enc || (nid != -1)) {
 131             if (kstr == NULL) {
 132                 klen = cb(buf, PEM_BUFSIZE, 1, u);
 133                 if (klen <= 0) {
 134                     PEMerr(PEM_F_DO_PK8PKEY, PEM_R_READ_KEY);
 135                     goto legacy_end;
 136                 }
 137
 138                 kstr = buf;
 139             }
 140             p8 = PKCS8_encrypt(nid, enc, kstr, klen, NULL, 0, 0, p8inf);
 141             if (kstr == buf)
 142                 OPENSSL_cleanse(buf, klen);
 143             if (p8 == NULL)
 144                 goto legacy_end;
 145             if (isder)
 146                 ret = i2d_PKCS8_bio(bp, p8);
 147             else
 148                 ret = PEM_write_bio_PKCS8(bp, p8);
 149             X509_SIG_free(p8);
 150         } else {
 151             if (isder)
 152                 ret = i2d_PKCS8_PRIV_KEY_INFO_bio(bp, p8inf);
 153             else
 154                 ret = PEM_write_bio_PKCS8_PRIV_KEY_INFO(bp, p8inf);
 155         }
 156      legacy_end:
 157         PKCS8_PRIV_KEY_INFO_free(p8inf);
 158     }
 159     OSSL_ENCODER_CTX_free(ctx);
 160     return ret;
 161 }
 162
 163 EVP_PKEY *d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
 164                                   void *u)
 165 {
 166     PKCS8_PRIV_KEY_INFO *p8inf = NULL;
 167     X509_SIG *p8 = NULL;
 168     int klen;
 169     EVP_PKEY *ret;
 170     char psbuf[PEM_BUFSIZE];
 171
 172     p8 = d2i_PKCS8_bio(bp, NULL);
 173     if (p8 == NULL)
 174         return NULL;
 175     if (cb != NULL)
 176         klen = cb(psbuf, PEM_BUFSIZE, 0, u);
 177     else
 178         klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
 179     if (klen < 0) {
 180         PEMerr(PEM_F_D2I_PKCS8PRIVATEKEY_BIO, PEM_R_BAD_PASSWORD_READ);
 181         X509_SIG_free(p8);
 182         return NULL;
 183     }
 184     p8inf = PKCS8_decrypt(p8, psbuf, klen);
 185     X509_SIG_free(p8);
 186     OPENSSL_cleanse(psbuf, klen);
 187     if (p8inf == NULL)
 188         return NULL;
 189     ret = EVP_PKCS82PKEY(p8inf);
 190     PKCS8_PRIV_KEY_INFO_free(p8inf);
 191     if (!ret)
 192         return NULL;
 193     if (x != NULL) {
 194         EVP_PKEY_free(*x);
 195         *x = ret;
 196     }
 197     return ret;
 198 }
 199
 200 #ifndef OPENSSL_NO_STDIO
 201
 202 int i2d_PKCS8PrivateKey_fp(FILE *fp, const EVP_PKEY *x, const EVP_CIPHER *enc,
 203                            const char *kstr, int klen,
 204                            pem_password_cb *cb, void *u)
 205 {
 206     return do_pk8pkey_fp(fp, x, 1, -1, enc, kstr, klen, cb, u, NULL, NULL);
 207 }
 208
 209 int i2d_PKCS8PrivateKey_nid_fp(FILE *fp, const EVP_PKEY *x, int nid,
 210                                const char *kstr, int klen,
 211                                pem_password_cb *cb, void *u)
 212 {
 213     return do_pk8pkey_fp(fp, x, 1, nid, NULL, kstr, klen, cb, u, NULL, NULL);
 214 }
 215
 216 int PEM_write_PKCS8PrivateKey_nid(FILE *fp, const EVP_PKEY *x, int nid,
 217                                   const char *kstr, int klen,
 218                                   pem_password_cb *cb, void *u)
 219 {
 220     return do_pk8pkey_fp(fp, x, 0, nid, NULL, kstr, klen, cb, u, NULL, NULL);
 221 }
 222
 223 int PEM_write_PKCS8PrivateKey(FILE *fp, const EVP_PKEY *x, const EVP_CIPHER *enc,
 224                               const char *kstr, int klen,
 225                               pem_password_cb *cb, void *u)
 226 {
 227     return do_pk8pkey_fp(fp, x, 0, -1, enc, kstr, klen, cb, u, NULL, NULL);
 228 }
 229
 230 static int do_pk8pkey_fp(FILE *fp, const EVP_PKEY *x, int isder, int nid,
 231                          const EVP_CIPHER *enc, const char *kstr, int klen,
 232                          pem_password_cb *cb, void *u,
 233                          OSSL_LIB_CTX *libctx, const char *propq)
 234 {
 235     BIO *bp;
 236     int ret;
 237
 238     if ((bp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 239         PEMerr(PEM_F_DO_PK8PKEY_FP, ERR_R_BUF_LIB);
 240         return 0;
 241     }
 242     ret = do_pk8pkey(bp, x, isder, nid, enc, kstr, klen, cb, u, libctx, propq);
 243     BIO_free(bp);
 244     return ret;
 245 }
 246
 247 EVP_PKEY *d2i_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
 248                                  void *u)
 249 {
 250     BIO *bp;
 251     EVP_PKEY *ret;
 252
 253     if ((bp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 254         PEMerr(PEM_F_D2I_PKCS8PRIVATEKEY_FP, ERR_R_BUF_LIB);
 255         return NULL;
 256     }
 257     ret = d2i_PKCS8PrivateKey_bio(bp, x, cb, u);
 258     BIO_free(bp);
 259     return ret;
 260 }
 261
 262 #endif
 263
 264 IMPLEMENT_PEM_rw(PKCS8, X509_SIG, PEM_STRING_PKCS8, X509_SIG)
 265
 266
 267 IMPLEMENT_PEM_rw(PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF,
 268                  PKCS8_PRIV_KEY_INFO)