FreeRDP/libfreerdp/crypto/crypto.c

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/**
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* FreeRDP: A Remote Desktop Protocol Implementation
* Cryptographic Abstraction Layer
*
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* Copyright 2011-2012 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
*
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* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <winpr/crt.h>
#include <winpr/crypto.h>
#include <freerdp/log.h>
#include <freerdp/crypto/crypto.h>
#define TAG FREERDP_TAG("crypto")
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CryptoCert crypto_cert_read(BYTE* data, UINT32 length)
{
CryptoCert cert = malloc(sizeof(*cert));
if (!cert)
return NULL;
/* 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 BYTE **) &data, length);
return cert;
}
void crypto_cert_free(CryptoCert cert)
{
if (cert == NULL)
return;
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X509_free(cert->px509);
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free(cert);
}
BOOL crypto_cert_get_public_key(CryptoCert cert, BYTE** PublicKey, DWORD* PublicKeyLength)
{
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BYTE* ptr;
int length;
BOOL status = TRUE;
EVP_PKEY* pkey = NULL;
pkey = X509_get_pubkey(cert->px509);
if (!pkey)
{
WLog_ERR(TAG, "X509_get_pubkey() failed");
status = FALSE;
goto exit;
}
length = i2d_PublicKey(pkey, NULL);
if (length < 1)
{
WLog_ERR(TAG, "i2d_PublicKey() failed");
status = FALSE;
goto exit;
}
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*PublicKeyLength = (DWORD) length;
*PublicKey = (BYTE*) malloc(length);
ptr = (BYTE*) (*PublicKey);
if (!ptr)
{
status = FALSE;
goto exit;
}
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i2d_PublicKey(pkey, &ptr);
exit:
if (pkey)
EVP_PKEY_free(pkey);
return status;
}
static int crypto_rsa_common(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* exponent, int exponent_size, BYTE* output)
{
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BN_CTX* ctx;
int output_length = -1;
BYTE* input_reverse;
BYTE* modulus_reverse;
BYTE* exponent_reverse;
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BIGNUM *mod, *exp, *x, *y;
input_reverse = (BYTE*) malloc(2 * key_length + exponent_size);
if (!input_reverse)
return -1;
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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);
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if (!(ctx = BN_CTX_new()))
goto fail_bn_ctx;
if (!(mod = BN_new()))
goto fail_bn_mod;
if (!(exp = BN_new()))
goto fail_bn_exp;
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if (!(x = BN_new()))
goto fail_bn_x;
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if (!(y = BN_new()))
goto fail_bn_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);
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BN_free(y);
fail_bn_y:
BN_clear_free(x);
fail_bn_x:
BN_free(exp);
fail_bn_exp:
BN_free(mod);
fail_bn_mod:
BN_CTX_free(ctx);
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fail_bn_ctx:
free(input_reverse);
return output_length;
}
static int crypto_rsa_public(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* exponent, BYTE* output)
{
return crypto_rsa_common(input, length, key_length, modulus, exponent, EXPONENT_MAX_SIZE, output);
}
static int crypto_rsa_private(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* private_exponent, BYTE* output)
{
return crypto_rsa_common(input, length, key_length, modulus, private_exponent, key_length, output);
}
int crypto_rsa_public_encrypt(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* exponent, BYTE* output)
{
return crypto_rsa_public(input, length, key_length, modulus, exponent, output);
}
int crypto_rsa_public_decrypt(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* exponent, BYTE* output)
{
return crypto_rsa_public(input, length, key_length, modulus, exponent, output);
}
int crypto_rsa_private_encrypt(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* private_exponent, BYTE* output)
{
return crypto_rsa_private(input, length, key_length, modulus, private_exponent, output);
}
int crypto_rsa_private_decrypt(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* private_exponent, BYTE* output)
{
return crypto_rsa_private(input, length, key_length, modulus, private_exponent, output);
}
int crypto_rsa_decrypt(const BYTE* input, int length, UINT32 key_length, const BYTE* modulus, const BYTE* private_exponent, BYTE* output)
{
return crypto_rsa_common(input, length, key_length, modulus, private_exponent, key_length, output);
}
void crypto_reverse(BYTE* data, int length)
{
int i, j;
BYTE temp;
for (i = 0, j = length - 1; i < j; i++, j--)
{
temp = data[i];
data[i] = data[j];
data[j] = temp;
}
}
char* crypto_cert_fingerprint(X509* xcert)
{
int i = 0;
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char* p;
char* fp_buffer;
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UINT32 fp_len;
BYTE fp[EVP_MAX_MD_SIZE];
X509_digest(xcert, EVP_sha1(), fp, &fp_len);
fp_buffer = (char*) calloc(fp_len, 3);
if (!fp_buffer)
return NULL;
p = fp_buffer;
for (i = 0; i < (int) (fp_len - 1); i++)
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{
sprintf(p, "%02"PRIx8":", fp[i]);
p = &fp_buffer[(i + 1) * 3];
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}
sprintf(p, "%02"PRIx8"", fp[i]);
return fp_buffer;
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}
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 = calloc(1, size + 1);
if (!buffer)
return NULL;
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_subject_common_name(X509* xcert, int* length)
{
int index;
BYTE* common_name_raw;
char* common_name;
X509_NAME* subject_name;
X509_NAME_ENTRY* entry;
ASN1_STRING* entry_data;
subject_name = X509_get_subject_name(xcert);
if (subject_name == NULL)
return NULL;
index = X509_NAME_get_index_by_NID(subject_name, NID_commonName, -1);
if (index < 0)
return NULL;
entry = X509_NAME_get_entry(subject_name, index);
if (entry == NULL)
return NULL;
entry_data = X509_NAME_ENTRY_get_data(entry);
if (entry_data == NULL)
return NULL;
*length = ASN1_STRING_to_UTF8(&common_name_raw, entry_data);
if (*length < 0)
return NULL;
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common_name = _strdup((char*)common_name_raw);
OPENSSL_free(common_name_raw);
return (char*) common_name;
}
void crypto_cert_subject_alt_name_free(int count, int *lengths,
char** alt_name)
{
int i;
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free(lengths);
if (alt_name)
{
for (i=0; i<count; i++)
{
if (alt_name[i])
OPENSSL_free(alt_name[i]);
}
free(alt_name);
}
}
char** crypto_cert_subject_alt_name(X509* xcert, int* count, int** lengths)
{
int index;
int length = 0;
char** strings = NULL;
BYTE* string;
int num_subject_alt_names;
GENERAL_NAMES* subject_alt_names;
GENERAL_NAME* subject_alt_name;
*count = 0;
subject_alt_names = X509_get_ext_d2i(xcert, NID_subject_alt_name, 0, 0);
if (!subject_alt_names)
return NULL;
num_subject_alt_names = sk_GENERAL_NAME_num(subject_alt_names);
if (num_subject_alt_names)
{
strings = (char**) calloc(num_subject_alt_names, sizeof(char*));
if (!strings)
goto out;
*lengths = (int*) calloc(num_subject_alt_names, sizeof(int));
if (!*lengths)
{
free(strings);
strings = NULL;
goto out;
}
}
for (index = 0; index < num_subject_alt_names; ++index)
{
subject_alt_name = sk_GENERAL_NAME_value(subject_alt_names, index);
if (subject_alt_name->type == GEN_DNS)
{
length = ASN1_STRING_to_UTF8(&string, subject_alt_name->d.dNSName);
strings[*count] = (char*) string;
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(*lengths)[*count] = length;
(*count)++;
}
}
if (*count < 1)
{
free(strings) ;
free(*lengths) ;
*lengths = NULL ;
return NULL;
}
out:
GENERAL_NAMES_free(subject_alt_names);
return strings;
}
char* crypto_cert_issuer(X509* xcert)
{
return crypto_print_name(X509_get_issuer_name(xcert));
}
BOOL x509_verify_certificate(CryptoCert cert, char* certificate_store_path)
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{
X509_STORE_CTX* csc;
BOOL status = FALSE;
X509_STORE* cert_ctx = NULL;
X509_LOOKUP* lookup = NULL;
X509* xcert = cert->px509;
cert_ctx = X509_STORE_new();
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if (cert_ctx == NULL)
goto end;
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#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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OpenSSL_add_all_algorithms();
#else
OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS \
| OPENSSL_INIT_ADD_ALL_DIGESTS \
| OPENSSL_INIT_LOAD_CONFIG, NULL);
#endif
lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
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if (lookup == NULL)
goto end;
lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir());
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if (lookup == NULL)
goto end;
X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
if (certificate_store_path != NULL)
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{
X509_LOOKUP_add_dir(lookup, certificate_store_path, X509_FILETYPE_PEM);
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}
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csc = X509_STORE_CTX_new();
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if (csc == NULL)
goto end;
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X509_STORE_set_flags(cert_ctx, 0);
if (!X509_STORE_CTX_init(csc, cert_ctx, xcert, cert->px509chain))
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goto end;
if (X509_verify_cert(csc) == 1)
status = TRUE;
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X509_STORE_CTX_free(csc);
X509_STORE_free(cert_ctx);
end:
return status;
}
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rdpCertificateData* crypto_get_certificate_data(X509* xcert, char* hostname, UINT16 port)
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{
char* issuer;
char* subject;
char* fp;
rdpCertificateData* certdata;
fp = crypto_cert_fingerprint(xcert);
if (!fp)
return NULL;
issuer = crypto_cert_issuer(xcert);
subject = crypto_cert_subject(xcert);
certdata = certificate_data_new(hostname, port, issuer, subject, fp);
free(subject);
free(issuer);
free(fp);
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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);
if (!fp)
{
WLog_ERR(TAG, "error computing fingerprint");
goto out_free_issuer;
}
WLog_INFO(TAG, "Certificate details:");
WLog_INFO(TAG, "\tSubject: %s", subject);
WLog_INFO(TAG, "\tIssuer: %s", issuer);
WLog_INFO(TAG, "\tThumbprint: %s", fp);
WLog_INFO(TAG, "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 OpenSSL documentation on how to add a private CA to the store.");
free(fp);
out_free_issuer:
free(issuer);
free(subject);
}