314 lines
7.1 KiB
C
314 lines
7.1 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Private key Handling
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*
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* Copyright 2011 Jiten Pathy
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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* Copyright 2015 Thincast Technologies GmbH
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* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
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* Copyright 2023 Armin Novak <anovak@thincast.com>
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* Copyright 2023 Thincast Technologies GmbH
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <freerdp/config.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <winpr/assert.h>
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#include <winpr/wtypes.h>
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#include <winpr/crt.h>
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#include <winpr/file.h>
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#include <winpr/crypto.h>
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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#include "privatekey.h"
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#include "cert_common.h"
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#include <freerdp/crypto/privatekey.h>
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#include <openssl/evp.h>
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#include "x509_utils.h"
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#include "crypto.h"
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#include "opensslcompat.h"
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#define TAG FREERDP_TAG("crypto")
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struct rdp_private_key
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{
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EVP_PKEY* evp;
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BOOL isRSA;
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rdpCertInfo cert;
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BYTE* PrivateExponent;
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DWORD PrivateExponentLength;
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};
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/*
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* Terminal Services Signing Keys.
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* Yes, Terminal Services Private Key is publicly available.
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*/
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static BYTE tssk_modulus[] = { 0x3d, 0x3a, 0x5e, 0xbd, 0x72, 0x43, 0x3e, 0xc9, 0x4d, 0xbb, 0xc1,
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0x1e, 0x4a, 0xba, 0x5f, 0xcb, 0x3e, 0x88, 0x20, 0x87, 0xef, 0xf5,
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0xc1, 0xe2, 0xd7, 0xb7, 0x6b, 0x9a, 0xf2, 0x52, 0x45, 0x95, 0xce,
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0x63, 0x65, 0x6b, 0x58, 0x3a, 0xfe, 0xef, 0x7c, 0xe7, 0xbf, 0xfe,
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0x3d, 0xf6, 0x5c, 0x7d, 0x6c, 0x5e, 0x06, 0x09, 0x1a, 0xf5, 0x61,
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0xbb, 0x20, 0x93, 0x09, 0x5f, 0x05, 0x6d, 0xea, 0x87 };
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static BYTE tssk_privateExponent[] = {
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0x87, 0xa7, 0x19, 0x32, 0xda, 0x11, 0x87, 0x55, 0x58, 0x00, 0x16, 0x16, 0x25, 0x65, 0x68, 0xf8,
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0x24, 0x3e, 0xe6, 0xfa, 0xe9, 0x67, 0x49, 0x94, 0xcf, 0x92, 0xcc, 0x33, 0x99, 0xe8, 0x08, 0x60,
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0x17, 0x9a, 0x12, 0x9f, 0x24, 0xdd, 0xb1, 0x24, 0x99, 0xc7, 0x3a, 0xb8, 0x0a, 0x7b, 0x0d, 0xdd,
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0x35, 0x07, 0x79, 0x17, 0x0b, 0x51, 0x9b, 0xb3, 0xc7, 0x10, 0x01, 0x13, 0xe7, 0x3f, 0xf3, 0x5f
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};
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static const rdpPrivateKey tssk = { .PrivateExponent = tssk_privateExponent,
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.PrivateExponentLength = sizeof(tssk_privateExponent),
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.cert = { .Modulus = tssk_modulus,
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.ModulusLength = sizeof(tssk_modulus) } };
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const rdpPrivateKey* priv_key_tssk = &tssk;
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static RSA* evp_pkey_to_rsa(const EVP_PKEY* evp)
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{
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WINPR_ASSERT(evp);
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if (EVP_PKEY_id(evp) != EVP_PKEY_RSA)
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{
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WLog_WARN(TAG, "Key is no RSA key");
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return NULL;
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}
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RSA* rsa = NULL;
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BIO* bio = BIO_new(BIO_s_secmem());
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if (!bio)
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return NULL;
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const int rc = PEM_write_bio_PrivateKey(bio, evp, NULL, NULL, 0, NULL, NULL);
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if (rc != 1)
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goto fail;
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rsa = PEM_read_bio_RSAPrivateKey(bio, NULL, NULL, NULL);
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fail:
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BIO_free_all(bio);
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return rsa;
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}
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static EVP_PKEY* evp_pkey_utils_from_pem(const char* data, size_t len, BOOL fromFile)
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{
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EVP_PKEY* evp = NULL;
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BIO* bio;
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if (fromFile)
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bio = BIO_new_file(data, "rb");
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else
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bio = BIO_new_mem_buf(data, len);
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if (!bio)
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{
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WLog_ERR(TAG, "BIO_new failed for private key");
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return NULL;
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}
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evp = PEM_read_bio_PrivateKey(bio, NULL, NULL, 0);
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BIO_free_all(bio);
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if (!evp)
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WLog_ERR(TAG, "PEM_read_bio_PrivateKey returned NULL [input length %" PRIuz "]", len);
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return evp;
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}
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static BOOL key_read_private(rdpPrivateKey* key)
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{
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BOOL rc = FALSE;
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WINPR_ASSERT(key);
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RSA* rsa = evp_pkey_to_rsa(key->evp);
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const BIGNUM* rsa_e = NULL;
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const BIGNUM* rsa_n = NULL;
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const BIGNUM* rsa_d = NULL;
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WINPR_ASSERT(key);
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if (!rsa)
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{
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WLog_ERR(TAG, "unable to load RSA key: %s.", strerror(errno));
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goto fail;
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}
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switch (RSA_check_key(rsa))
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{
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case 0:
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WLog_ERR(TAG, "invalid RSA key");
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goto fail;
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case 1:
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/* Valid key. */
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break;
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default:
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WLog_ERR(TAG, "unexpected error when checking RSA key: %s.", strerror(errno));
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goto fail;
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}
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RSA_get0_key(rsa, &rsa_n, &rsa_e, &rsa_d);
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if (BN_num_bytes(rsa_e) > 4)
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{
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WLog_ERR(TAG, "RSA public exponent too large");
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goto fail;
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}
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if (!read_bignum(&key->PrivateExponent, &key->PrivateExponentLength, rsa_d, TRUE))
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goto fail;
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if (!cert_info_create(&key->cert, rsa_n, rsa_e))
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goto fail;
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rc = TRUE;
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fail:
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RSA_free(rsa);
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return rc;
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}
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rdpPrivateKey* freerdp_key_new_from_pem(const char* pem)
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{
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rdpPrivateKey* key = freerdp_key_new();
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if (!key || !pem)
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goto fail;
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key->evp = evp_pkey_utils_from_pem(pem, strlen(pem), FALSE);
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if (!key->evp)
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goto fail;
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if (!key_read_private(key))
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goto fail;
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return key;
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fail:
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freerdp_key_free(key);
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return NULL;
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}
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rdpPrivateKey* freerdp_key_new_from_file(const char* keyfile)
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{
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rdpPrivateKey* key = freerdp_key_new();
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if (!key || !keyfile)
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goto fail;
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key->evp = evp_pkey_utils_from_pem(keyfile, strlen(keyfile), TRUE);
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if (!key->evp)
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goto fail;
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if (!key_read_private(key))
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goto fail;
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return key;
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fail:
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freerdp_key_free(key);
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return NULL;
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}
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rdpPrivateKey* freerdp_key_new(void)
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{
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return calloc(1, sizeof(rdpPrivateKey));
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}
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rdpPrivateKey* freerdp_key_clone(const rdpPrivateKey* key)
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{
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if (!key)
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return NULL;
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rdpPrivateKey* _key = (rdpPrivateKey*)calloc(1, sizeof(rdpPrivateKey));
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if (!_key)
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return NULL;
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_key->isRSA = key->isRSA;
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if (key->evp)
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{
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_key->evp = key->evp;
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if (!_key->evp)
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goto out_fail;
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EVP_PKEY_up_ref(_key->evp);
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}
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if (key->PrivateExponent)
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{
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_key->PrivateExponent = (BYTE*)malloc(key->PrivateExponentLength);
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if (!_key->PrivateExponent)
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goto out_fail;
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CopyMemory(_key->PrivateExponent, key->PrivateExponent, key->PrivateExponentLength);
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_key->PrivateExponentLength = key->PrivateExponentLength;
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}
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return _key;
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out_fail:
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freerdp_key_free(_key);
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return NULL;
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}
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void freerdp_key_free(rdpPrivateKey* key)
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{
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if (!key)
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return;
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EVP_PKEY_free(key->evp);
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if (key->PrivateExponent)
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memset(key->PrivateExponent, 0, key->PrivateExponentLength);
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free(key->PrivateExponent);
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cert_info_free(&key->cert);
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free(key);
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}
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const rdpCertInfo* freerdp_key_get_info(const rdpPrivateKey* key)
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{
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WINPR_ASSERT(key);
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if (!key->isRSA)
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return NULL;
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return &key->cert;
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}
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const BYTE* freerdp_key_get_exponent(const rdpPrivateKey* key, size_t* plength)
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{
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WINPR_ASSERT(key);
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if (!key->isRSA)
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{
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if (plength)
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*plength = 0;
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return NULL;
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}
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if (plength)
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*plength = key->PrivateExponentLength;
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return key->PrivateExponent;
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}
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RSA* freerdp_key_get_RSA(const rdpPrivateKey* key)
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{
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WINPR_ASSERT(key);
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if (!key->isRSA)
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return NULL;
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return evp_pkey_to_rsa(key->evp);
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}
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EVP_PKEY* freerdp_key_get_evp_pkey(const rdpPrivateKey* key)
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{
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WINPR_ASSERT(key);
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EVP_PKEY* evp = key->evp;
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EVP_PKEY_up_ref(evp);
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return evp;
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}
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