crypto/pem/pem_pk8.c

   1 /*
   2  * Copyright 1995-2021 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                       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                          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);
  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);
  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);
  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);
  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, const char *propq)
  72 {
  73     int ret = 0;
  74     const char *outtype = isder ? "DER" : "PEM";
  75     OSSL_ENCODER_CTX *ctx =
  76         OSSL_ENCODER_CTX_new_for_pkey(x, OSSL_KEYMGMT_SELECT_ALL,
  77                                       outtype, "pkcs8", propq);
  78
  79     if (ctx == NULL)
  80         return 0;
  81
  82     /*
  83      * If no keystring or callback is set, OpenSSL traditionally uses the
  84      * user's cb argument as a password string, or if that's NULL, it falls
  85      * back on PEM_def_callback().
  86      */
  87     if (kstr == NULL && cb == NULL) {
  88         if (u != NULL) {
  89             kstr = u;
  90             klen = strlen(u);
  91         } else {
  92             cb = PEM_def_callback;
  93         }
  94     }
  95
  96     /*
  97      * NOTE: There is no attempt to do a EVP_CIPHER_fetch() using the nid,
  98      * since the nid is a PBE algorithm which can't be fetched currently.
  99      * (e.g. NID_pbe_WithSHA1And2_Key_TripleDES_CBC). Just use the legacy
 100      * path if the NID is passed.
 101      */
 102     if (nid == -1 && OSSL_ENCODER_CTX_get_num_encoders(ctx) != 0) {
 103         ret = 1;
 104         if (enc != NULL) {
 105             ret = 0;
 106             if (OSSL_ENCODER_CTX_set_cipher(ctx, EVP_CIPHER_get0_name(enc),
 107                                             NULL)) {
 108                 const unsigned char *ukstr = (const unsigned char *)kstr;
 109
 110                 /*
 111                  * Try to pass the passphrase if one was given, or the
 112                  * passphrase callback if one was given.  If none of them
 113                  * are given and that's wrong, we rely on the _to_bio()
 114                  * call to generate errors.
 115                  */
 116                 ret = 1;
 117                 if (kstr != NULL
 118                     && !OSSL_ENCODER_CTX_set_passphrase(ctx, ukstr, klen))
 119                     ret = 0;
 120                 else if (cb != NULL
 121                          && !OSSL_ENCODER_CTX_set_pem_password_cb(ctx, cb, u))
 122                     ret = 0;
 123             }
 124         }
 125         ret = ret && OSSL_ENCODER_to_bio(ctx, bp);
 126     } else {
 127         X509_SIG *p8;
 128         PKCS8_PRIV_KEY_INFO *p8inf;
 129         char buf[PEM_BUFSIZE];
 130
 131         ret = 0;
 132         if ((p8inf = EVP_PKEY2PKCS8(x)) == NULL) {
 133             ERR_raise(ERR_LIB_PEM, PEM_R_ERROR_CONVERTING_PRIVATE_KEY);
 134             goto legacy_end;
 135         }
 136         if (enc || (nid != -1)) {
 137             if (kstr == NULL) {
 138                 klen = cb(buf, PEM_BUFSIZE, 1, u);
 139                 if (klen <= 0) {
 140                     ERR_raise(ERR_LIB_PEM, PEM_R_READ_KEY);
 141                     goto legacy_end;
 142                 }
 143
 144                 kstr = buf;
 145             }
 146             p8 = PKCS8_encrypt(nid, enc, kstr, klen, NULL, 0, 0, p8inf);
 147             if (kstr == buf)
 148                 OPENSSL_cleanse(buf, klen);
 149             if (p8 == NULL)
 150                 goto legacy_end;
 151             if (isder)
 152                 ret = i2d_PKCS8_bio(bp, p8);
 153             else
 154                 ret = PEM_write_bio_PKCS8(bp, p8);
 155             X509_SIG_free(p8);
 156         } else {
 157             if (isder)
 158                 ret = i2d_PKCS8_PRIV_KEY_INFO_bio(bp, p8inf);
 159             else
 160                 ret = PEM_write_bio_PKCS8_PRIV_KEY_INFO(bp, p8inf);
 161         }
 162      legacy_end:
 163         PKCS8_PRIV_KEY_INFO_free(p8inf);
 164     }
 165     OSSL_ENCODER_CTX_free(ctx);
 166     return ret;
 167 }
 168
 169 EVP_PKEY *d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
 170                                   void *u)
 171 {
 172     PKCS8_PRIV_KEY_INFO *p8inf = NULL;
 173     X509_SIG *p8 = NULL;
 174     int klen;
 175     EVP_PKEY *ret;
 176     char psbuf[PEM_BUFSIZE];
 177
 178     p8 = d2i_PKCS8_bio(bp, NULL);
 179     if (p8 == NULL)
 180         return NULL;
 181     if (cb != NULL)
 182         klen = cb(psbuf, PEM_BUFSIZE, 0, u);
 183     else
 184         klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
 185     if (klen < 0) {
 186         ERR_raise(ERR_LIB_PEM, PEM_R_BAD_PASSWORD_READ);
 187         X509_SIG_free(p8);
 188         return NULL;
 189     }
 190     p8inf = PKCS8_decrypt(p8, psbuf, klen);
 191     X509_SIG_free(p8);
 192     OPENSSL_cleanse(psbuf, klen);
 193     if (p8inf == NULL)
 194         return NULL;
 195     ret = EVP_PKCS82PKEY(p8inf);
 196     PKCS8_PRIV_KEY_INFO_free(p8inf);
 197     if (!ret)
 198         return NULL;
 199     if (x != NULL) {
 200         EVP_PKEY_free(*x);
 201         *x = ret;
 202     }
 203     return ret;
 204 }
 205
 206 #ifndef OPENSSL_NO_STDIO
 207
 208 int i2d_PKCS8PrivateKey_fp(FILE *fp, const EVP_PKEY *x, const EVP_CIPHER *enc,
 209                            const char *kstr, int klen,
 210                            pem_password_cb *cb, void *u)
 211 {
 212     return do_pk8pkey_fp(fp, x, 1, -1, enc, kstr, klen, cb, u, NULL);
 213 }
 214
 215 int i2d_PKCS8PrivateKey_nid_fp(FILE *fp, const EVP_PKEY *x, int nid,
 216                                const char *kstr, int klen,
 217                                pem_password_cb *cb, void *u)
 218 {
 219     return do_pk8pkey_fp(fp, x, 1, nid, NULL, kstr, klen, cb, u, NULL);
 220 }
 221
 222 int PEM_write_PKCS8PrivateKey_nid(FILE *fp, const EVP_PKEY *x, int nid,
 223                                   const char *kstr, int klen,
 224                                   pem_password_cb *cb, void *u)
 225 {
 226     return do_pk8pkey_fp(fp, x, 0, nid, NULL, kstr, klen, cb, u, NULL);
 227 }
 228
 229 int PEM_write_PKCS8PrivateKey(FILE *fp, const EVP_PKEY *x, const EVP_CIPHER *enc,
 230                               const char *kstr, int klen,
 231                               pem_password_cb *cb, void *u)
 232 {
 233     return do_pk8pkey_fp(fp, x, 0, -1, enc, kstr, klen, cb, u, NULL);
 234 }
 235
 236 static int do_pk8pkey_fp(FILE *fp, const EVP_PKEY *x, int isder, int nid,
 237                          const EVP_CIPHER *enc, const char *kstr, int klen,
 238                          pem_password_cb *cb, void *u, const char *propq)
 239 {
 240     BIO *bp;
 241     int ret;
 242
 243     if ((bp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 244         ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
 245         return 0;
 246     }
 247     ret = do_pk8pkey(bp, x, isder, nid, enc, kstr, klen, cb, u, propq);
 248     BIO_free(bp);
 249     return ret;
 250 }
 251
 252 EVP_PKEY *d2i_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
 253                                  void *u)
 254 {
 255     BIO *bp;
 256     EVP_PKEY *ret;
 257
 258     if ((bp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 259         ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
 260         return NULL;
 261     }
 262     ret = d2i_PKCS8PrivateKey_bio(bp, x, cb, u);
 263     BIO_free(bp);
 264     return ret;
 265 }
 266
 267 #endif
 268
 269 IMPLEMENT_PEM_rw(PKCS8, X509_SIG, PEM_STRING_PKCS8, X509_SIG)
 270
 271
 272 IMPLEMENT_PEM_rw(PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF,
 273                  PKCS8_PRIV_KEY_INFO)