providers/implementations/encode_decode/encode_key2ms.c

   1 /*
   2  * Copyright 2020-2021 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 /*
  11  * Low level APIs are deprecated for public use, but still ok for internal use.
  12  */
  13 #include "internal/deprecated.h"
  14
  15 #include <string.h>
  16 #include <openssl/core.h>
  17 #include <openssl/core_dispatch.h>
  18 #include <openssl/core_names.h>
  19 #include <openssl/params.h>
  20 #include <openssl/err.h>
  21 #include <openssl/pem.h>         /* Functions for writing MSBLOB and PVK */
  22 #include <openssl/dsa.h>
  23 #include "internal/passphrase.h"
  24 #include "crypto/rsa.h"
  25 #include "prov/implementations.h"
  26 #include "prov/bio.h"
  27 #include "prov/provider_ctx.h"
  28 #include "endecoder_local.h"
  29
  30 struct key2ms_ctx_st {
  31     PROV_CTX *provctx;
  32
  33     int pvk_encr_level;
  34
  35     struct ossl_passphrase_data_st pwdata;
  36 };
  37
  38 static int write_msblob(struct key2ms_ctx_st *ctx, OSSL_CORE_BIO *cout,
  39                         EVP_PKEY *pkey, int ispub)
  40 {
  41     BIO *out = ossl_bio_new_from_core_bio(ctx->provctx, cout);
  42     int ret =
  43         ispub ? i2b_PublicKey_bio(out, pkey) : i2b_PrivateKey_bio(out, pkey);
  44
  45     BIO_free(out);
  46     return ret;
  47 }
  48
  49 static int write_pvk(struct key2ms_ctx_st *ctx, OSSL_CORE_BIO *cout,
  50                      EVP_PKEY *pkey,
  51                      OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
  52 {
  53     BIO *out = NULL;
  54     int ret = 0;
  55     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
  56
  57     out = ossl_bio_new_from_core_bio(ctx->provctx, cout);
  58     ret = i2b_PVK_bio_ex(out, pkey, ctx->pvk_encr_level,
  59                          ossl_pw_pem_password, &ctx->pwdata, libctx, NULL);
  60     BIO_free(out);
  61
  62     return ret;
  63 }
  64
  65 static OSSL_FUNC_encoder_freectx_fn key2ms_freectx;
  66 static OSSL_FUNC_encoder_does_selection_fn key2ms_does_selection;
  67
  68 static struct key2ms_ctx_st *key2ms_newctx(void *provctx)
  69 {
  70     struct key2ms_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
  71
  72     if (ctx != NULL) {
  73         ctx->provctx = provctx;
  74         /* This is the strongest encryption level */
  75         ctx->pvk_encr_level = 2;
  76     }
  77     return ctx;
  78 }
  79
  80 static void key2ms_freectx(void *vctx)
  81 {
  82     struct key2ms_ctx_st *ctx = vctx;
  83
  84     OPENSSL_free(ctx);
  85 }
  86
  87 static const OSSL_PARAM *key2pvk_settable_ctx_params(ossl_unused void *provctx)
  88 {
  89     static const OSSL_PARAM settables[] = {
  90         OSSL_PARAM_int(OSSL_ENCODER_PARAM_ENCRYPT_LEVEL, NULL),
  91         OSSL_PARAM_END,
  92     };
  93
  94     return settables;
  95 }
  96
  97 static int key2pvk_set_ctx_params(void *vctx, const OSSL_PARAM params[])
  98 {
  99     struct key2ms_ctx_st *ctx = vctx;
 100     const OSSL_PARAM *p;
 101
 102     p = OSSL_PARAM_locate_const(params, OSSL_ENCODER_PARAM_ENCRYPT_LEVEL);
 103     if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->pvk_encr_level))
 104         return 0;
 105     return 1;
 106 }
 107
 108 static int key2ms_does_selection(void *vctx, int selection)
 109 {
 110     return (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0;
 111 }
 112
 113 /*
 114  * The real EVP_PKEY_set1_TYPE() functions take a non-const key, while the key
 115  * pointer in the encode function is a const pointer.  We violate the constness
 116  * knowingly, since we know that the key comes from the same provider, is never
 117  * actually const, and the implied reference count change is safe.
 118  *
 119  * EVP_PKEY_assign() can't be used, because there's no way to clear the internal
 120  * key using that function without freeing the existing internal key.
 121  */
 122 typedef int evp_pkey_set1_fn(EVP_PKEY *, const void *key);
 123
 124 static int key2msblob_encode(void *vctx, const void *key, int selection,
 125                              OSSL_CORE_BIO *cout, evp_pkey_set1_fn *set1_key,
 126                              OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
 127 {
 128     struct key2ms_ctx_st *ctx = vctx;
 129     int ispub = -1;
 130     EVP_PKEY *pkey = NULL;
 131     int ok = 0;
 132
 133     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 134         ispub = 0;
 135     else if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 136         ispub = 1;
 137     else
 138         return 0;                /* Error */
 139
 140     if ((pkey = EVP_PKEY_new()) != NULL && set1_key(pkey, key))
 141         ok = write_msblob(ctx, cout, pkey, ispub);
 142     EVP_PKEY_free(pkey);
 143     return ok;
 144 }
 145
 146 static int key2pvk_encode(void *vctx, const void *key, int selection,
 147                           OSSL_CORE_BIO *cout, evp_pkey_set1_fn *set1_key,
 148                           OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
 149 {
 150     struct key2ms_ctx_st *ctx = vctx;
 151     EVP_PKEY *pkey = NULL;
 152     int ok = 0;
 153
 154     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) == 0)
 155         return 0;                /* Error */
 156
 157     if ((pkey = EVP_PKEY_new()) != NULL && set1_key(pkey, key))
 158         ok = write_pvk(ctx, cout, pkey, pw_cb, pw_cbarg);
 159     EVP_PKEY_free(pkey);
 160     return ok;
 161 }
 162
 163 #define dsa_set1        (evp_pkey_set1_fn *)EVP_PKEY_set1_DSA
 164 #define rsa_set1        (evp_pkey_set1_fn *)EVP_PKEY_set1_RSA
 165
 166 #define msblob_set_params
 167 #define pvk_set_params                                                        \
 168         { OSSL_FUNC_ENCODER_SETTABLE_CTX_PARAMS,                              \
 169           (void (*)(void))key2pvk_settable_ctx_params },                      \
 170         { OSSL_FUNC_ENCODER_SET_CTX_PARAMS,                                   \
 171           (void (*)(void))key2pvk_set_ctx_params },
 172
 173 #define MAKE_MS_ENCODER(impl, output, type)                                   \
 174     static OSSL_FUNC_encoder_import_object_fn                                 \
 175     impl##2##output##_import_object;                                          \
 176     static OSSL_FUNC_encoder_free_object_fn impl##2##output##_free_object;    \
 177     static OSSL_FUNC_encoder_encode_fn impl##2##output##_encode;              \
 178                                                                               \
 179     static void *                                                             \
 180     impl##2##output##_import_object(void *ctx, int selection,                 \
 181                                     const OSSL_PARAM params[])                \
 182     {                                                                         \
 183         return ossl_prov_import_key(ossl_##impl##_keymgmt_functions,          \
 184                                     ctx, selection, params);                  \
 185     }                                                                         \
 186     static void impl##2##output##_free_object(void *key)                      \
 187     {                                                                         \
 188         ossl_prov_free_key(ossl_##impl##_keymgmt_functions, key);             \
 189     }                                                                         \
 190     static int impl##2##output##_encode(void *vctx, OSSL_CORE_BIO *cout,      \
 191                                         const void *key,                      \
 192                                         const OSSL_PARAM key_abstract[],      \
 193                                         int selection,                        \
 194                                         OSSL_PASSPHRASE_CALLBACK *cb,         \
 195                                         void *cbarg)                          \
 196     {                                                                         \
 197         /* We don't deal with abstract objects */                             \
 198         if (key_abstract != NULL) {                                           \
 199             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);           \
 200             return 0;                                                         \
 201         }                                                                     \
 202         return key2##output##_encode(vctx, key, selection, cout, type##_set1, \
 203                                      cb, cbarg);                              \
 204     }                                                                         \
 205     const OSSL_DISPATCH ossl_##impl##_to_##output##_encoder_functions[] = {   \
 206         { OSSL_FUNC_ENCODER_NEWCTX,                                           \
 207           (void (*)(void))key2ms_newctx },                                    \
 208         { OSSL_FUNC_ENCODER_FREECTX,                                          \
 209           (void (*)(void))key2ms_freectx },                                   \
 210         output##_set_params                                                   \
 211         { OSSL_FUNC_ENCODER_DOES_SELECTION,                                   \
 212           (void (*)(void))key2ms_does_selection },                            \
 213         { OSSL_FUNC_ENCODER_IMPORT_OBJECT,                                    \
 214           (void (*)(void))impl##2##output##_import_object },                  \
 215         { OSSL_FUNC_ENCODER_FREE_OBJECT,                                      \
 216           (void (*)(void))impl##2##output##_free_object },                    \
 217         { OSSL_FUNC_ENCODER_ENCODE,                                           \
 218           (void (*)(void))impl##2##output##_encode },                         \
 219         { 0, NULL }                                                           \
 220     }
 221
 222 #ifndef OPENSSL_NO_DSA
 223 MAKE_MS_ENCODER(dsa, pvk, dsa);
 224 MAKE_MS_ENCODER(dsa, msblob, dsa);
 225 #endif
 226
 227 MAKE_MS_ENCODER(rsa, pvk, rsa);
 228 MAKE_MS_ENCODER(rsa, msblob, rsa);