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|
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager Wireless Applet -- Display wireless access points and allow user control
*
* Dan Williams <dcbw@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
* Copyright 2007 - 2009 Red Hat, Inc.
*/
#include "config.h"
#include <glib.h>
#include <glib/gi18n.h>
#include <gcrypt.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gnutls/pkcs12.h>
#include "crypto.h"
#include "nm-errors.h"
#define SALT_LEN 8
static gboolean initialized = FALSE;
gboolean
crypto_init (GError **error)
{
if (initialized)
return TRUE;
if (gnutls_global_init() != 0) {
gnutls_global_deinit();
g_set_error_literal (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_FAILED,
_("Failed to initialize the crypto engine."));
return FALSE;
}
initialized = TRUE;
return TRUE;
}
void
crypto_deinit (void)
{
}
gboolean
crypto_md5_hash (const char *salt,
const gsize salt_len,
const char *password,
gsize password_len,
char *buffer,
gsize buflen,
GError **error)
{
gcry_md_hd_t ctx;
gcry_error_t err;
int nkey = buflen;
const gsize digest_len = 16;
int count = 0;
char digest[MD5_HASH_LEN];
char *p = buffer;
if (salt)
g_return_val_if_fail (salt_len >= SALT_LEN, FALSE);
g_return_val_if_fail (password != NULL, FALSE);
g_return_val_if_fail (password_len > 0, FALSE);
g_return_val_if_fail (buffer != NULL, FALSE);
g_return_val_if_fail (buflen > 0, FALSE);
err = gcry_md_open (&ctx, GCRY_MD_MD5, 0);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_FAILED,
_("Failed to initialize the MD5 engine: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
return FALSE;
}
while (nkey > 0) {
int i = 0;
if (count++)
gcry_md_write (ctx, digest, digest_len);
gcry_md_write (ctx, password, password_len);
if (salt)
gcry_md_write (ctx, salt, SALT_LEN); /* Only use 8 bytes of salt */
gcry_md_final (ctx);
memcpy (digest, gcry_md_read (ctx, 0), digest_len);
gcry_md_reset (ctx);
while (nkey && (i < digest_len)) {
*(p++) = digest[i++];
nkey--;
}
}
memset (digest, 0, sizeof (digest));
gcry_md_close (ctx);
return TRUE;
}
char *
crypto_decrypt (const char *cipher,
int key_type,
const guint8 *data,
gsize data_len,
const char *iv,
const gsize iv_len,
const char *key,
const gsize key_len,
gsize *out_len,
GError **error)
{
gcry_cipher_hd_t ctx;
gcry_error_t err;
int cipher_mech, i;
char *output = NULL;
gboolean success = FALSE;
gsize pad_len, real_iv_len;
if (!strcmp (cipher, CIPHER_DES_EDE3_CBC)) {
cipher_mech = GCRY_CIPHER_3DES;
real_iv_len = SALT_LEN;
} else if (!strcmp (cipher, CIPHER_DES_CBC)) {
cipher_mech = GCRY_CIPHER_DES;
real_iv_len = SALT_LEN;
} else if (!strcmp (cipher, CIPHER_AES_CBC)) {
cipher_mech = GCRY_CIPHER_AES;
real_iv_len = 16;
} else {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_UNKNOWN_CIPHER,
_("Private key cipher '%s' was unknown."),
cipher);
return NULL;
}
if (iv_len < real_iv_len) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_INVALID_DATA,
_("Invalid IV length (must be at least %zd)."),
real_iv_len);
return NULL;
}
output = g_malloc0 (data_len);
err = gcry_cipher_open (&ctx, cipher_mech, GCRY_CIPHER_MODE_CBC, 0);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_DECRYPTION_FAILED,
_("Failed to initialize the decryption cipher context: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
err = gcry_cipher_setkey (ctx, key, key_len);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_DECRYPTION_FAILED,
_("Failed to set symmetric key for decryption: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
err = gcry_cipher_setiv (ctx, iv, iv_len);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_DECRYPTION_FAILED,
_("Failed to set IV for decryption: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
err = gcry_cipher_decrypt (ctx, output, data_len, data, data_len);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_DECRYPTION_FAILED,
_("Failed to decrypt the private key: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
pad_len = output[data_len - 1];
/* Check if the padding at the end of the decrypted data is valid */
if (pad_len == 0 || pad_len > real_iv_len) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_DECRYPTION_FAILED,
_("Failed to decrypt the private key: unexpected padding length."));
goto out;
}
/* Validate tail padding; last byte is the padding size, and all pad bytes
* should contain the padding size.
*/
for (i = 1; i <= pad_len; ++i) {
if (output[data_len - i] != pad_len) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_DECRYPTION_FAILED,
_("Failed to decrypt the private key."));
goto out;
}
}
*out_len = data_len - pad_len;
success = TRUE;
out:
if (!success) {
if (output) {
/* Don't expose key material */
memset (output, 0, data_len);
g_free (output);
output = NULL;
}
}
gcry_cipher_close (ctx);
return output;
}
char *
crypto_encrypt (const char *cipher,
const guint8 *data,
gsize data_len,
const char *iv,
const gsize iv_len,
const char *key,
gsize key_len,
gsize *out_len,
GError **error)
{
gcry_cipher_hd_t ctx;
gcry_error_t err;
int cipher_mech;
char *output = NULL;
gboolean success = FALSE;
gsize padded_buf_len, pad_len, output_len;
char *padded_buf = NULL;
guint32 i;
gsize salt_len;
if (!strcmp (cipher, CIPHER_DES_EDE3_CBC)) {
cipher_mech = GCRY_CIPHER_3DES;
salt_len = SALT_LEN;
} else if (!strcmp (cipher, CIPHER_AES_CBC)) {
cipher_mech = GCRY_CIPHER_AES;
salt_len = iv_len;
} else {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_UNKNOWN_CIPHER,
_("Private key cipher '%s' was unknown."),
cipher);
return NULL;
}
/* If data_len % ivlen == 0, then we add another complete block
* onto the end so that the decrypter knows there's padding.
*/
pad_len = iv_len - (data_len % iv_len);
output_len = padded_buf_len = data_len + pad_len;
padded_buf = g_malloc0 (padded_buf_len);
memcpy (padded_buf, data, data_len);
for (i = 0; i < pad_len; i++)
padded_buf[data_len + i] = (guint8) (pad_len & 0xFF);
output = g_malloc0 (output_len);
err = gcry_cipher_open (&ctx, cipher_mech, GCRY_CIPHER_MODE_CBC, 0);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
_("Failed to initialize the encryption cipher context: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
err = gcry_cipher_setkey (ctx, key, key_len);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
_("Failed to set symmetric key for encryption: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
/* gcrypt only wants 8 bytes of the IV (same as the DES block length) */
err = gcry_cipher_setiv (ctx, iv, salt_len);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
_("Failed to set IV for encryption: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
err = gcry_cipher_encrypt (ctx, output, output_len, padded_buf, padded_buf_len);
if (err) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
_("Failed to encrypt the data: %s / %s."),
gcry_strsource (err), gcry_strerror (err));
goto out;
}
*out_len = output_len;
success = TRUE;
out:
if (padded_buf) {
memset (padded_buf, 0, padded_buf_len);
g_free (padded_buf);
padded_buf = NULL;
}
if (!success) {
if (output) {
/* Don't expose key material */
memset (output, 0, output_len);
g_free (output);
output = NULL;
}
}
gcry_cipher_close (ctx);
return output;
}
NMCryptoFileFormat
crypto_verify_cert (const unsigned char *data,
gsize len,
GError **error)
{
gnutls_x509_crt_t der;
gnutls_datum_t dt;
int err;
err = gnutls_x509_crt_init (&der);
if (err < 0) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_INVALID_DATA,
_("Error initializing certificate data: %s"),
gnutls_strerror (err));
return NM_CRYPTO_FILE_FORMAT_UNKNOWN;
}
/* Try DER first */
dt.data = (unsigned char *) data;
dt.size = len;
err = gnutls_x509_crt_import (der, &dt, GNUTLS_X509_FMT_DER);
if (err == GNUTLS_E_SUCCESS) {
gnutls_x509_crt_deinit (der);
return NM_CRYPTO_FILE_FORMAT_X509;
}
/* And PEM next */
err = gnutls_x509_crt_import (der, &dt, GNUTLS_X509_FMT_PEM);
gnutls_x509_crt_deinit (der);
if (err == GNUTLS_E_SUCCESS)
return NM_CRYPTO_FILE_FORMAT_X509;
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_INVALID_DATA,
_("Couldn't decode certificate: %s"),
gnutls_strerror (err));
return NM_CRYPTO_FILE_FORMAT_UNKNOWN;
}
gboolean
crypto_verify_pkcs12 (const guint8 *data,
gsize data_len,
const char *password,
GError **error)
{
gnutls_pkcs12_t p12;
gnutls_datum_t dt;
gboolean success = FALSE;
int err;
g_return_val_if_fail (data != NULL, FALSE);
dt.data = (unsigned char *) data;
dt.size = data_len;
err = gnutls_pkcs12_init (&p12);
if (err < 0) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_FAILED,
_("Couldn't initialize PKCS#12 decoder: %s"),
gnutls_strerror (err));
return FALSE;
}
/* DER first */
err = gnutls_pkcs12_import (p12, &dt, GNUTLS_X509_FMT_DER, 0);
if (err < 0) {
/* PEM next */
err = gnutls_pkcs12_import (p12, &dt, GNUTLS_X509_FMT_PEM, 0);
if (err < 0) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_INVALID_DATA,
_("Couldn't decode PKCS#12 file: %s"),
gnutls_strerror (err));
goto out;
}
}
err = gnutls_pkcs12_verify_mac (p12, password);
if (err == GNUTLS_E_SUCCESS)
success = TRUE;
else {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_DECRYPTION_FAILED,
_("Couldn't verify PKCS#12 file: %s"),
gnutls_strerror (err));
}
out:
gnutls_pkcs12_deinit (p12);
return success;
}
gboolean
crypto_verify_pkcs8 (const guint8 *data,
gsize data_len,
gboolean is_encrypted,
const char *password,
GError **error)
{
gnutls_x509_privkey_t p8;
gnutls_datum_t dt;
int err;
g_return_val_if_fail (data != NULL, FALSE);
dt.data = (unsigned char *) data;
dt.size = data_len;
err = gnutls_x509_privkey_init (&p8);
if (err < 0) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_FAILED,
_("Couldn't initialize PKCS#8 decoder: %s"),
gnutls_strerror (err));
return FALSE;
}
err = gnutls_x509_privkey_import_pkcs8 (p8,
&dt,
GNUTLS_X509_FMT_DER,
is_encrypted ? password : NULL,
is_encrypted ? 0 : GNUTLS_PKCS_PLAIN);
gnutls_x509_privkey_deinit (p8);
if (err < 0) {
if (err == GNUTLS_E_UNKNOWN_CIPHER_TYPE) {
/* HACK: gnutls doesn't support all the cipher types that openssl
* can use with PKCS#8, so if we encounter one, we have to assume
* the given password works. gnutls needs to unsuckify, apparently.
* Specifically, by default openssl uses pbeWithMD5AndDES-CBC
* which gnutls does not support.
*/
} else {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERROR_INVALID_DATA,
_("Couldn't decode PKCS#8 file: %s"),
gnutls_strerror (err));
return FALSE;
}
}
return TRUE;
}
gboolean
crypto_randomize (void *buffer, gsize buffer_len, GError **error)
{
gcry_randomize (buffer, buffer_len, GCRY_STRONG_RANDOM);
return TRUE;
}
|