FreeRDP/libfreerdp-core/crypto.c
Pawel Jakub Dawidek 44663ab332 Introduce more complete RSA API that implements:
- crypto_rsa_public_encrypt()
- crypto_rsa_public_decrypt()
- crypto_rsa_private_encrypt()
- crypto_rsa_private_decrypt()
2012-01-19 04:48:52 +01:00

464 lines
11 KiB
C

/**
* FreeRDP: A Remote Desktop Protocol Client
* Cryptographic Abstraction Layer
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "crypto.h"
CryptoSha1 crypto_sha1_init(void)
{
CryptoSha1 sha1 = xmalloc(sizeof(*sha1));
SHA1_Init(&sha1->sha_ctx);
return sha1;
}
void crypto_sha1_update(CryptoSha1 sha1, const uint8* data, uint32 length)
{
SHA1_Update(&sha1->sha_ctx, data, length);
}
void crypto_sha1_final(CryptoSha1 sha1, uint8* out_data)
{
SHA1_Final(out_data, &sha1->sha_ctx);
xfree(sha1);
}
CryptoMd5 crypto_md5_init(void)
{
CryptoMd5 md5 = xmalloc(sizeof(*md5));
MD5_Init(&md5->md5_ctx);
return md5;
}
void crypto_md5_update(CryptoMd5 md5, const uint8* data, uint32 length)
{
MD5_Update(&md5->md5_ctx, data, length);
}
void crypto_md5_final(CryptoMd5 md5, uint8* out_data)
{
MD5_Final(out_data, &md5->md5_ctx);
xfree(md5);
}
CryptoRc4 crypto_rc4_init(const uint8* key, uint32 length)
{
CryptoRc4 rc4 = xmalloc(sizeof(*rc4));
RC4_set_key(&rc4->rc4_key, length, key);
return rc4;
}
void crypto_rc4(CryptoRc4 rc4, uint32 length, const uint8* in_data, uint8* out_data)
{
RC4(&rc4->rc4_key, length, in_data, out_data);
}
void crypto_rc4_free(CryptoRc4 rc4)
{
xfree(rc4);
}
CryptoDes3 crypto_des3_encrypt_init(const uint8* key, const uint8* ivec)
{
CryptoDes3 des3 = xmalloc(sizeof(*des3));
EVP_CIPHER_CTX_init(&des3->des3_ctx);
EVP_EncryptInit_ex(&des3->des3_ctx, EVP_des_ede3_cbc(), NULL, key, ivec);
EVP_CIPHER_CTX_set_padding(&des3->des3_ctx, 0);
return des3;
}
CryptoDes3 crypto_des3_decrypt_init(const uint8* key, const uint8* ivec)
{
CryptoDes3 des3 = xmalloc(sizeof(*des3));
EVP_CIPHER_CTX_init(&des3->des3_ctx);
EVP_DecryptInit_ex(&des3->des3_ctx, EVP_des_ede3_cbc(), NULL, key, ivec);
EVP_CIPHER_CTX_set_padding(&des3->des3_ctx, 0);
return des3;
}
void crypto_des3_encrypt(CryptoDes3 des3, uint32 length, const uint8* in_data, uint8* out_data)
{
int len;
EVP_EncryptUpdate(&des3->des3_ctx, out_data, &len, in_data, length);
}
void crypto_des3_decrypt(CryptoDes3 des3, uint32 length, const uint8* in_data, uint8* out_data)
{
int len;
EVP_DecryptUpdate(&des3->des3_ctx, out_data, &len, in_data, length);
if (length != len)
abort(); // TODO
}
void crypto_des3_free(CryptoDes3 des3)
{
EVP_CIPHER_CTX_cleanup(&des3->des3_ctx);
xfree(des3);
}
CryptoHmac crypto_hmac_new(void)
{
CryptoHmac hmac = xmalloc(sizeof(*hmac));
HMAC_CTX_init(&hmac->hmac_ctx);
return hmac;
}
void crypto_hmac_sha1_init(CryptoHmac hmac, const uint8* data, uint32 length)
{
HMAC_Init_ex(&hmac->hmac_ctx, data, length, EVP_sha1(), NULL);
}
void crypto_hmac_update(CryptoHmac hmac, const uint8* data, uint32 length)
{
HMAC_Update(&hmac->hmac_ctx, data, length);
}
void crypto_hmac_final(CryptoHmac hmac, uint8* out_data, uint32 length)
{
HMAC_Final(&hmac->hmac_ctx, out_data, &length);
}
void crypto_hmac_free(CryptoHmac hmac)
{
HMAC_CTX_cleanup(&hmac->hmac_ctx);
xfree(hmac);
}
CryptoCert crypto_cert_read(uint8* data, uint32 length)
{
CryptoCert cert = xmalloc(sizeof(*cert));
/* this will move the data pointer but we don't care, we don't use it again */
cert->px509 = d2i_X509(NULL, (D2I_X509_CONST uint8 **) &data, length);
return cert;
}
void crypto_cert_free(CryptoCert cert)
{
X509_free(cert->px509);
xfree(cert);
}
boolean crypto_cert_get_public_key(CryptoCert cert, rdpBlob* public_key)
{
uint8* p;
int length;
boolean status = true;
EVP_PKEY* pkey = NULL;
pkey = X509_get_pubkey(cert->px509);
if (!pkey)
{
printf("crypto_cert_get_public_key: X509_get_pubkey() failed\n");
status = false;
goto exit;
}
length = i2d_PublicKey(pkey, NULL);
if (length < 1)
{
printf("crypto_cert_get_public_key: i2d_PublicKey() failed\n");
status = false;
goto exit;
}
freerdp_blob_alloc(public_key, length);
p = (uint8*) public_key->data;
i2d_PublicKey(pkey, &p);
exit:
if (pkey)
EVP_PKEY_free(pkey);
return status;
}
/*
* Terminal Services Signing Keys.
* Yes, Terminal Services Private Key is publically available.
*/
const uint8 tssk_modulus[] = {
0x3d, 0x3a, 0x5e, 0xbd, 0x72, 0x43, 0x3e, 0xc9,
0x4d, 0xbb, 0xc1, 0x1e, 0x4a, 0xba, 0x5f, 0xcb,
0x3e, 0x88, 0x20, 0x87, 0xef, 0xf5, 0xc1, 0xe2,
0xd7, 0xb7, 0x6b, 0x9a, 0xf2, 0x52, 0x45, 0x95,
0xce, 0x63, 0x65, 0x6b, 0x58, 0x3a, 0xfe, 0xef,
0x7c, 0xe7, 0xbf, 0xfe, 0x3d, 0xf6, 0x5c, 0x7d,
0x6c, 0x5e, 0x06, 0x09, 0x1a, 0xf5, 0x61, 0xbb,
0x20, 0x93, 0x09, 0x5f, 0x05, 0x6d, 0xea, 0x87
};
const uint8 tssk_privateExponent[] = {
0x87, 0xa7, 0x19, 0x32, 0xda, 0x11, 0x87, 0x55,
0x58, 0x00, 0x16, 0x16, 0x25, 0x65, 0x68, 0xf8,
0x24, 0x3e, 0xe6, 0xfa, 0xe9, 0x67, 0x49, 0x94,
0xcf, 0x92, 0xcc, 0x33, 0x99, 0xe8, 0x08, 0x60,
0x17, 0x9a, 0x12, 0x9f, 0x24, 0xdd, 0xb1, 0x24,
0x99, 0xc7, 0x3a, 0xb8, 0x0a, 0x7b, 0x0d, 0xdd,
0x35, 0x07, 0x79, 0x17, 0x0b, 0x51, 0x9b, 0xb3,
0xc7, 0x10, 0x01, 0x13, 0xe7, 0x3f, 0xf3, 0x5f
};
const uint8 tssk_exponent[] = {
0x5b, 0x7b, 0x88, 0xc0
};
static void crypto_rsa_common(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, int exponent_size, uint8* output)
{
BN_CTX* ctx;
int output_length;
uint8* input_reverse;
uint8* modulus_reverse;
uint8* exponent_reverse;
BIGNUM mod, exp, x, y;
input_reverse = (uint8*) xmalloc(2 * key_length + exponent_size);
modulus_reverse = input_reverse + key_length;
exponent_reverse = modulus_reverse + key_length;
memcpy(modulus_reverse, modulus, key_length);
crypto_reverse(modulus_reverse, key_length);
memcpy(exponent_reverse, exponent, exponent_size);
crypto_reverse(exponent_reverse, exponent_size);
memcpy(input_reverse, input, length);
crypto_reverse(input_reverse, length);
ctx = BN_CTX_new();
BN_init(&mod);
BN_init(&exp);
BN_init(&x);
BN_init(&y);
BN_bin2bn(modulus_reverse, key_length, &mod);
BN_bin2bn(exponent_reverse, exponent_size, &exp);
BN_bin2bn(input_reverse, length, &x);
BN_mod_exp(&y, &x, &exp, &mod, ctx);
output_length = BN_bn2bin(&y, output);
crypto_reverse(output, output_length);
if (output_length < (int) key_length)
memset(output + output_length, 0, key_length - output_length);
BN_free(&y);
BN_clear_free(&x);
BN_free(&exp);
BN_free(&mod);
BN_CTX_free(ctx);
xfree(input_reverse);
}
static void crypto_rsa_public(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, uint8* output)
{
crypto_rsa_common(input, length, key_length, modulus, exponent, EXPONENT_MAX_SIZE, output);
}
static void crypto_rsa_private(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
{
crypto_rsa_common(input, length, key_length, modulus, private_exponent, key_length, output);
}
void crypto_rsa_public_encrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, uint8* output)
{
crypto_rsa_public(input, length, key_length, modulus, exponent, output);
}
void crypto_rsa_public_decrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* exponent, uint8* output)
{
crypto_rsa_public(input, length, key_length, modulus, exponent, output);
}
void crypto_rsa_private_encrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
{
crypto_rsa_private(input, length, key_length, modulus, private_exponent, output);
}
void crypto_rsa_private_decrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
{
crypto_rsa_private(input, length, key_length, modulus, private_exponent, output);
}
void crypto_rsa_decrypt(const uint8* input, int length, uint32 key_length, const uint8* modulus, const uint8* private_exponent, uint8* output)
{
crypto_rsa_common(input, length, key_length, modulus, private_exponent, key_length, output);
}
void crypto_reverse(uint8* data, int length)
{
int i, j;
uint8 temp;
for (i = 0, j = length - 1; i < j; i++, j--)
{
temp = data[i];
data[i] = data[j];
data[j] = temp;
}
}
void crypto_nonce(uint8* nonce, int size)
{
RAND_bytes((void*) nonce, size);
}
char* crypto_cert_fingerprint(X509* xcert)
{
int i = 0;
char* p;
char* fp_buffer;
uint32 fp_len;
uint8 fp[EVP_MAX_MD_SIZE];
X509_digest(xcert, EVP_sha1(), fp, &fp_len);
fp_buffer = (char*) xzalloc(3 * fp_len);
p = fp_buffer;
for (i = 0; i < (int) (fp_len - 1); i++)
{
sprintf(p, "%02x:", fp[i]);
p = &fp_buffer[i * 3];
}
sprintf(p, "%02x", fp[i]);
return fp_buffer;
}
char* crypto_print_name(X509_NAME* name)
{
char* buffer = NULL;
BIO* outBIO = BIO_new(BIO_s_mem());
if(X509_NAME_print_ex(outBIO, name, 0, XN_FLAG_ONELINE) > 0)
{
unsigned long size = BIO_number_written(outBIO);
buffer = xzalloc(size + 1);
memset(buffer, 0, size + 1);
BIO_read(outBIO, buffer, size);
}
BIO_free(outBIO);
return buffer;
}
char* crypto_cert_subject(X509* xcert)
{
return crypto_print_name(X509_get_subject_name(xcert));
}
char* crypto_cert_issuer(X509* xcert)
{
return crypto_print_name(X509_get_issuer_name(xcert));
}
boolean x509_verify_cert(CryptoCert cert, rdpSettings* settings)
{
char* cert_loc;
X509_STORE_CTX* csc;
boolean status = false;
X509_STORE* cert_ctx = NULL;
X509_LOOKUP* lookup = NULL;
X509* xcert = cert->px509;
cert_ctx = X509_STORE_new();
if (cert_ctx == NULL)
goto end;
OpenSSL_add_all_algorithms();
lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
if (lookup == NULL)
goto end;
lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir());
if (lookup == NULL)
goto end;
X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
cert_loc = get_local_certloc(settings->home_path);
if(cert_loc != NULL)
{
X509_LOOKUP_add_dir(lookup, cert_loc, X509_FILETYPE_ASN1);
xfree(cert_loc);
}
csc = X509_STORE_CTX_new();
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;
}
rdpCertData* crypto_get_cert_data(X509* xcert, char* hostname)
{
char* fp;
rdpCertData* certdata;
fp = crypto_cert_fingerprint(xcert);
certdata = certdata_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);
}