548 lines
13 KiB
C
548 lines
13 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Client
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* Cryptographic Abstraction Layer
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*
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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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/crypto/crypto.h>
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CryptoSha1 crypto_sha1_init(void)
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{
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CryptoSha1 sha1 = xmalloc(sizeof(*sha1));
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SHA1_Init(&sha1->sha_ctx);
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return sha1;
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}
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void crypto_sha1_update(CryptoSha1 sha1, const uint8* data, uint32 length)
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{
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SHA1_Update(&sha1->sha_ctx, data, length);
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}
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void crypto_sha1_final(CryptoSha1 sha1, uint8* out_data)
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{
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SHA1_Final(out_data, &sha1->sha_ctx);
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xfree(sha1);
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}
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CryptoMd5 crypto_md5_init(void)
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{
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CryptoMd5 md5 = xmalloc(sizeof(*md5));
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MD5_Init(&md5->md5_ctx);
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return md5;
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}
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void crypto_md5_update(CryptoMd5 md5, const uint8* data, uint32 length)
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{
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MD5_Update(&md5->md5_ctx, data, length);
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}
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void crypto_md5_final(CryptoMd5 md5, uint8* out_data)
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{
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MD5_Final(out_data, &md5->md5_ctx);
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xfree(md5);
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}
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CryptoRc4 crypto_rc4_init(const uint8* key, uint32 length)
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{
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CryptoRc4 rc4 = xmalloc(sizeof(*rc4));
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RC4_set_key(&rc4->rc4_key, length, key);
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return rc4;
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}
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void crypto_rc4(CryptoRc4 rc4, uint32 length, const uint8* in_data, uint8* out_data)
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{
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RC4(&rc4->rc4_key, length, in_data, out_data);
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}
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void crypto_rc4_free(CryptoRc4 rc4)
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{
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xfree(rc4);
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}
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CryptoDes3 crypto_des3_encrypt_init(const uint8* key, const uint8* ivec)
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{
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CryptoDes3 des3 = xmalloc(sizeof(*des3));
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EVP_CIPHER_CTX_init(&des3->des3_ctx);
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EVP_EncryptInit_ex(&des3->des3_ctx, EVP_des_ede3_cbc(), NULL, key, ivec);
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EVP_CIPHER_CTX_set_padding(&des3->des3_ctx, 0);
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return des3;
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}
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CryptoDes3 crypto_des3_decrypt_init(const uint8* key, const uint8* ivec)
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{
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CryptoDes3 des3 = xmalloc(sizeof(*des3));
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EVP_CIPHER_CTX_init(&des3->des3_ctx);
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EVP_DecryptInit_ex(&des3->des3_ctx, EVP_des_ede3_cbc(), NULL, key, ivec);
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EVP_CIPHER_CTX_set_padding(&des3->des3_ctx, 0);
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return des3;
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}
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void crypto_des3_encrypt(CryptoDes3 des3, uint32 length, const uint8* in_data, uint8* out_data)
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{
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int len;
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EVP_EncryptUpdate(&des3->des3_ctx, out_data, &len, in_data, length);
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}
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void crypto_des3_decrypt(CryptoDes3 des3, uint32 length, const uint8* in_data, uint8* out_data)
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{
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int len;
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EVP_DecryptUpdate(&des3->des3_ctx, out_data, &len, in_data, length);
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if (length != len)
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abort(); /* TODO */
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}
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void crypto_des3_free(CryptoDes3 des3)
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{
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if (des3 == NULL)
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return;
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EVP_CIPHER_CTX_cleanup(&des3->des3_ctx);
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xfree(des3);
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}
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CryptoHmac crypto_hmac_new(void)
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{
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CryptoHmac hmac = xmalloc(sizeof(*hmac));
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HMAC_CTX_init(&hmac->hmac_ctx);
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return hmac;
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}
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void crypto_hmac_sha1_init(CryptoHmac hmac, const uint8* data, uint32 length)
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{
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HMAC_Init_ex(&hmac->hmac_ctx, data, length, EVP_sha1(), NULL);
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}
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void crypto_hmac_update(CryptoHmac hmac, const uint8* data, uint32 length)
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{
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HMAC_Update(&hmac->hmac_ctx, data, length);
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}
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void crypto_hmac_final(CryptoHmac hmac, uint8* out_data, uint32 length)
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{
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HMAC_Final(&hmac->hmac_ctx, out_data, &length);
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}
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void crypto_hmac_free(CryptoHmac hmac)
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{
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if (hmac == NULL)
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return;
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HMAC_CTX_cleanup(&hmac->hmac_ctx);
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xfree(hmac);
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}
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CryptoCert crypto_cert_read(uint8* data, uint32 length)
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{
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CryptoCert cert = xmalloc(sizeof(*cert));
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/* this will move the data pointer but we don't care, we don't use it again */
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cert->px509 = d2i_X509(NULL, (D2I_X509_CONST uint8 **) &data, length);
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return cert;
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}
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void crypto_cert_free(CryptoCert cert)
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{
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if (cert == NULL)
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return;
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X509_free(cert->px509);
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xfree(cert);
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}
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boolean crypto_cert_get_public_key(CryptoCert cert, rdpBlob* public_key)
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{
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uint8* p;
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int length;
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boolean status = true;
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EVP_PKEY* pkey = NULL;
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pkey = X509_get_pubkey(cert->px509);
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if (!pkey)
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{
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printf("crypto_cert_get_public_key: X509_get_pubkey() failed\n");
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status = false;
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goto exit;
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}
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length = i2d_PublicKey(pkey, NULL);
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if (length < 1)
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{
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printf("crypto_cert_get_public_key: i2d_PublicKey() failed\n");
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status = false;
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goto exit;
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}
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freerdp_blob_alloc(public_key, length);
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p = (uint8*) public_key->data;
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i2d_PublicKey(pkey, &p);
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exit:
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if (pkey)
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EVP_PKEY_free(pkey);
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return status;
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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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const uint8 tssk_modulus[] =
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{
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0x3d, 0x3a, 0x5e, 0xbd, 0x72, 0x43, 0x3e, 0xc9,
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0x4d, 0xbb, 0xc1, 0x1e, 0x4a, 0xba, 0x5f, 0xcb,
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0x3e, 0x88, 0x20, 0x87, 0xef, 0xf5, 0xc1, 0xe2,
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0xd7, 0xb7, 0x6b, 0x9a, 0xf2, 0x52, 0x45, 0x95,
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0xce, 0x63, 0x65, 0x6b, 0x58, 0x3a, 0xfe, 0xef,
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0x7c, 0xe7, 0xbf, 0xfe, 0x3d, 0xf6, 0x5c, 0x7d,
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0x6c, 0x5e, 0x06, 0x09, 0x1a, 0xf5, 0x61, 0xbb,
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0x20, 0x93, 0x09, 0x5f, 0x05, 0x6d, 0xea, 0x87
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};
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const uint8 tssk_privateExponent[] =
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{
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0x87, 0xa7, 0x19, 0x32, 0xda, 0x11, 0x87, 0x55,
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0x58, 0x00, 0x16, 0x16, 0x25, 0x65, 0x68, 0xf8,
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0x24, 0x3e, 0xe6, 0xfa, 0xe9, 0x67, 0x49, 0x94,
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0xcf, 0x92, 0xcc, 0x33, 0x99, 0xe8, 0x08, 0x60,
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0x17, 0x9a, 0x12, 0x9f, 0x24, 0xdd, 0xb1, 0x24,
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0x99, 0xc7, 0x3a, 0xb8, 0x0a, 0x7b, 0x0d, 0xdd,
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0x35, 0x07, 0x79, 0x17, 0x0b, 0x51, 0x9b, 0xb3,
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0xc7, 0x10, 0x01, 0x13, 0xe7, 0x3f, 0xf3, 0x5f
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};
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const uint8 tssk_exponent[] =
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{
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0x5b, 0x7b, 0x88, 0xc0
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};
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static void crypto_rsa_common(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, int exponent_size, uint8* output)
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{
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BN_CTX* ctx;
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int output_length;
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uint8* input_reverse;
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uint8* modulus_reverse;
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uint8* exponent_reverse;
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BIGNUM mod, exp, x, y;
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input_reverse = (uint8*) xmalloc(2 * key_length + exponent_size);
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modulus_reverse = input_reverse + key_length;
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exponent_reverse = modulus_reverse + key_length;
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memcpy(modulus_reverse, modulus, key_length);
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crypto_reverse(modulus_reverse, key_length);
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memcpy(exponent_reverse, exponent, exponent_size);
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crypto_reverse(exponent_reverse, exponent_size);
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memcpy(input_reverse, input, length);
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crypto_reverse(input_reverse, length);
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ctx = BN_CTX_new();
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BN_init(&mod);
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BN_init(&exp);
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BN_init(&x);
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BN_init(&y);
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BN_bin2bn(modulus_reverse, key_length, &mod);
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BN_bin2bn(exponent_reverse, exponent_size, &exp);
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BN_bin2bn(input_reverse, length, &x);
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BN_mod_exp(&y, &x, &exp, &mod, ctx);
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output_length = BN_bn2bin(&y, output);
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crypto_reverse(output, output_length);
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if (output_length < (int) key_length)
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memset(output + output_length, 0, key_length - output_length);
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BN_free(&y);
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BN_clear_free(&x);
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BN_free(&exp);
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BN_free(&mod);
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BN_CTX_free(ctx);
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xfree(input_reverse);
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}
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static void crypto_rsa_public(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, uint8* output)
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{
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crypto_rsa_common(input, length, key_length, modulus, exponent, EXPONENT_MAX_SIZE, output);
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}
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static void crypto_rsa_private(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
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{
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crypto_rsa_common(input, length, key_length, modulus, private_exponent, key_length, output);
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}
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void crypto_rsa_public_encrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, uint8* output)
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{
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crypto_rsa_public(input, length, key_length, modulus, exponent, output);
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}
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void crypto_rsa_public_decrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, uint8* output)
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{
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crypto_rsa_public(input, length, key_length, modulus, exponent, output);
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}
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void crypto_rsa_private_encrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
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{
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crypto_rsa_private(input, length, key_length, modulus, private_exponent, output);
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}
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void crypto_rsa_private_decrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
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{
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crypto_rsa_private(input, length, key_length, modulus, private_exponent, output);
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}
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void crypto_rsa_decrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
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{
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crypto_rsa_common(input, length, key_length, modulus, private_exponent, key_length, output);
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}
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void crypto_reverse(uint8* data, int length)
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{
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int i, j;
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uint8 temp;
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for (i = 0, j = length - 1; i < j; i++, j--)
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{
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temp = data[i];
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data[i] = data[j];
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data[j] = temp;
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}
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}
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void crypto_nonce(uint8* nonce, int size)
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{
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RAND_bytes((void*) nonce, size);
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}
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char* crypto_cert_fingerprint(X509* xcert)
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{
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int i = 0;
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char* p;
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char* fp_buffer;
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uint32 fp_len;
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uint8 fp[EVP_MAX_MD_SIZE];
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X509_digest(xcert, EVP_sha1(), fp, &fp_len);
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fp_buffer = (char*) xzalloc(3 * fp_len);
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p = fp_buffer;
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for (i = 0; i < (int) (fp_len - 1); i++)
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{
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sprintf(p, "%02x:", fp[i]);
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p = &fp_buffer[i * 3];
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}
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sprintf(p, "%02x", fp[i]);
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return fp_buffer;
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}
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char* crypto_print_name(X509_NAME* name)
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{
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char* buffer = NULL;
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BIO* outBIO = BIO_new(BIO_s_mem());
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if (X509_NAME_print_ex(outBIO, name, 0, XN_FLAG_ONELINE) > 0)
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{
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unsigned long size = BIO_number_written(outBIO);
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buffer = xzalloc(size + 1);
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memset(buffer, 0, size + 1);
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BIO_read(outBIO, buffer, size);
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}
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BIO_free(outBIO);
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return buffer;
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}
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char* crypto_cert_subject(X509* xcert)
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{
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return crypto_print_name(X509_get_subject_name(xcert));
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}
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char* crypto_cert_subject_common_name(X509* xcert, int* length)
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{
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int index;
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uint8* common_name;
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X509_NAME* subject_name;
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X509_NAME_ENTRY* entry;
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ASN1_STRING* entry_data;
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subject_name = X509_get_subject_name(xcert);
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if (subject_name == NULL)
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return NULL;
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index = X509_NAME_get_index_by_NID(subject_name, NID_commonName, -1);
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if (index < 0)
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return NULL;
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entry = X509_NAME_get_entry(subject_name, index);
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if (entry == NULL)
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return NULL;
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entry_data = X509_NAME_ENTRY_get_data(entry);
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if (entry_data == NULL)
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return NULL;
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*length = ASN1_STRING_to_UTF8(&common_name, entry_data);
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if (*length < 0)
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return NULL;
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return (char*) common_name;
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}
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char** crypto_cert_subject_alt_name(X509* xcert, int* count, int** lengths)
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{
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int index;
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int length;
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char** strings;
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uint8* string;
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int num_subject_alt_names;
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GENERAL_NAMES* subject_alt_names;
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GENERAL_NAME* subject_alt_name;
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*count = 0;
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subject_alt_names = X509_get_ext_d2i(xcert, NID_subject_alt_name, 0, 0);
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if (!subject_alt_names)
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return NULL;
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num_subject_alt_names = sk_GENERAL_NAME_num(subject_alt_names);
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strings = (char**) malloc(sizeof(char*) * num_subject_alt_names);
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*lengths = (int*) malloc(sizeof(int*) * num_subject_alt_names);
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for (index = 0; index < num_subject_alt_names; ++index)
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{
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subject_alt_name = sk_GENERAL_NAME_value(subject_alt_names, index);
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if (subject_alt_name->type == GEN_DNS)
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{
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length = ASN1_STRING_to_UTF8(&string, subject_alt_name->d.dNSName);
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strings[*count] = (char*) string;
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(*lengths)[*count] = length;
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(*count)++;
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}
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}
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if (*count < 1)
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return NULL;
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return strings;
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}
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char* crypto_cert_issuer(X509* xcert)
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{
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return crypto_print_name(X509_get_issuer_name(xcert));
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}
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boolean x509_verify_certificate(CryptoCert cert, char* certificate_store_path)
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{
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X509_STORE_CTX* csc;
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boolean status = false;
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X509_STORE* cert_ctx = NULL;
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X509_LOOKUP* lookup = NULL;
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X509* xcert = cert->px509;
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cert_ctx = X509_STORE_new();
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if (cert_ctx == NULL)
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goto end;
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OpenSSL_add_all_algorithms();
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lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
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if (lookup == NULL)
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goto end;
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lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir());
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if (lookup == NULL)
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goto end;
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X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
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if (certificate_store_path != NULL)
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{
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X509_LOOKUP_add_dir(lookup, certificate_store_path, X509_FILETYPE_ASN1);
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}
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csc = X509_STORE_CTX_new();
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|
if (csc == NULL)
|
|
goto end;
|
|
|
|
X509_STORE_set_flags(cert_ctx, 0);
|
|
|
|
if (!X509_STORE_CTX_init(csc, cert_ctx, xcert, 0))
|
|
goto end;
|
|
|
|
if (X509_verify_cert(csc) == 1)
|
|
status = true;
|
|
|
|
X509_STORE_CTX_free(csc);
|
|
X509_STORE_free(cert_ctx);
|
|
|
|
end:
|
|
return status;
|
|
}
|
|
|
|
rdpCertificateData* crypto_get_certificate_data(X509* xcert, char* hostname)
|
|
{
|
|
char* fp;
|
|
rdpCertificateData* certdata;
|
|
|
|
fp = crypto_cert_fingerprint(xcert);
|
|
certdata = certificate_data_new(hostname, fp);
|
|
xfree(fp);
|
|
|
|
return certdata;
|
|
}
|
|
|
|
void crypto_cert_print_info(X509* xcert)
|
|
{
|
|
char* fp;
|
|
char* issuer;
|
|
char* subject;
|
|
|
|
subject = crypto_cert_subject(xcert);
|
|
issuer = crypto_cert_issuer(xcert);
|
|
fp = crypto_cert_fingerprint(xcert);
|
|
|
|
printf("Certificate details:\n");
|
|
printf("\tSubject: %s\n", subject);
|
|
printf("\tIssuer: %s\n", issuer);
|
|
printf("\tThumbprint: %s\n", fp);
|
|
printf("The above X.509 certificate could not be verified, possibly because you do not have "
|
|
"the CA certificate in your certificate store, or the certificate has expired. "
|
|
"Please look at the documentation on how to create local certificate store for a private CA.\n");
|
|
|
|
xfree(subject);
|
|
xfree(issuer);
|
|
xfree(fp);
|
|
}
|
|
|