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/* Copyright (c) 2012, Oracle and/or its affiliates.
Copyright (c) 2013, Monty Program Ab
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1307 USA */
#include <my_global.h>
#if defined(HAVE_OPENSSL)
#include "crypt_genhash_impl.h"
#include "mysql/client_authentication.h"
#include "m_ctype.h"
#include "sql_common.h"
#include "errmsg.h"
#include "m_string.h"
#include <string.h>
#if !defined(HAVE_YASSL)
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#if defined(_WIN32) && !defined(_OPENSSL_Applink) && defined(HAVE_OPENSSL_APPLINK_C)
#include <openssl/applink.c>
#endif
#endif
#include "mysql/service_my_plugin_log.h"
#define MAX_CIPHER_LENGTH 1024
#if !defined(HAVE_YASSL)
mysql_mutex_t g_public_key_mutex;
#endif
int sha256_password_init(char *a, size_t b, int c, va_list d)
{
#if !defined(HAVE_YASSL)
mysql_mutex_init(0,&g_public_key_mutex, MY_MUTEX_INIT_SLOW);
#endif
return 0;
}
int sha256_password_deinit(void)
{
#if !defined(HAVE_YASSL)
mysql_mutex_destroy(&g_public_key_mutex);
#endif
return 0;
}
#if !defined(HAVE_YASSL)
/**
Reads and parse RSA public key data from a file.
@param mysql connection handle with file path data
@return Pointer to the RSA public key storage buffer
*/
RSA *rsa_init(MYSQL *mysql)
{
static RSA *g_public_key= NULL;
RSA *key= NULL;
mysql_mutex_lock(&g_public_key_mutex);
key= g_public_key;
mysql_mutex_unlock(&g_public_key_mutex);
if (key != NULL)
return key;
FILE *pub_key_file= NULL;
if (mysql->options.extension != NULL &&
mysql->options.extension->server_public_key_path != NULL &&
mysql->options.extension->server_public_key_path != '\0')
{
pub_key_file= fopen(mysql->options.extension->server_public_key_path,
"r");
}
/* No public key is used; return 0 without errors to indicate this. */
else
return 0;
if (pub_key_file == NULL)
{
/*
If a key path was submitted but no key located then we print an error
message. Else we just report that there is no public key.
*/
fprintf(stderr,"Can't locate server public key '%s'\n",
mysql->options.extension->server_public_key_path);
return 0;
}
mysql_mutex_lock(&g_public_key_mutex);
key= g_public_key= PEM_read_RSA_PUBKEY(pub_key_file, 0, 0, 0);
mysql_mutex_unlock(&g_public_key_mutex);
fclose(pub_key_file);
if (g_public_key == NULL)
{
fprintf(stderr, "Public key is not in PEM format: '%s'\n",
mysql->options.extension->server_public_key_path);
return 0;
}
return key;
}
#endif // !defined(HAVE_YASSL)
/**
Authenticate the client using the RSA or TLS and a SHA256 salted password.
@param vio Provides plugin access to communication channel
@param mysql Client connection handler
@return Error status
@retval CR_ERROR An error occurred.
@retval CR_OK Authentication succeeded.
*/
extern "C"
int sha256_password_auth_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql)
{
bool uses_password= mysql->passwd[0] != 0;
#if !defined(HAVE_YASSL)
unsigned char encrypted_password[MAX_CIPHER_LENGTH];
static char request_public_key= '\1';
RSA *public_key= NULL;
bool got_public_key_from_server= false;
#endif
bool connection_is_secure= false;
unsigned char scramble_pkt[20];
unsigned char *pkt;
DBUG_ENTER("sha256_password_auth_client");
/*
Get the scramble from the server because we need it when sending encrypted
password.
*/
if (vio->read_packet(vio, &pkt) != SCRAMBLE_LENGTH)
{
DBUG_PRINT("info",("Scramble is not of correct length."));
DBUG_RETURN(CR_ERROR);
}
/*
Copy the scramble to the stack or it will be lost on the next use of the
net buffer.
*/
memcpy(scramble_pkt, pkt, SCRAMBLE_LENGTH);
if (mysql_get_ssl_cipher(mysql) != NULL)
connection_is_secure= true;
/* If connection isn't secure attempt to get the RSA public key file */
if (!connection_is_secure)
{
#if !defined(HAVE_YASSL)
public_key= rsa_init(mysql);
#endif
}
if (!uses_password)
{
/* We're not using a password */
static const unsigned char zero_byte= '\0';
if (vio->write_packet(vio, (const unsigned char *) &zero_byte, 1))
DBUG_RETURN(CR_ERROR);
}
else
{
/* Password is a 0-terminated byte array ('\0' character included) */
unsigned int passwd_len= strlen(mysql->passwd) + 1;
if (!connection_is_secure)
{
#if !defined(HAVE_YASSL)
/*
If no public key; request one from the server.
*/
if (public_key == NULL)
{
if (vio->write_packet(vio, (const unsigned char *) &request_public_key,
1))
DBUG_RETURN(CR_ERROR);
int pkt_len= 0;
unsigned char *pkt;
if ((pkt_len= vio->read_packet(vio, &pkt)) == -1)
DBUG_RETURN(CR_ERROR);
BIO* bio= BIO_new_mem_buf(pkt, pkt_len);
public_key= PEM_read_bio_RSA_PUBKEY(bio, NULL, NULL, NULL);
BIO_free(bio);
if (public_key == 0)
DBUG_RETURN(CR_ERROR);
got_public_key_from_server= true;
}
/* Obfuscate the plain text password with the session scramble */
xor_string(mysql->passwd, strlen(mysql->passwd), (char *) scramble_pkt,
SCRAMBLE_LENGTH);
/* Encrypt the password and send it to the server */
int cipher_length= RSA_size(public_key);
/*
When using RSA_PKCS1_OAEP_PADDING the password length must be less
than RSA_size(rsa) - 41.
*/
if (passwd_len + 41 >= (unsigned) cipher_length)
{
/* password message is to long */
DBUG_RETURN(CR_ERROR);
}
RSA_public_encrypt(passwd_len, (unsigned char *) mysql->passwd,
encrypted_password,
public_key, RSA_PKCS1_OAEP_PADDING);
if (got_public_key_from_server)
RSA_free(public_key);
if (vio->write_packet(vio, (uchar*) encrypted_password, cipher_length))
DBUG_RETURN(CR_ERROR);
#else
set_mysql_extended_error(mysql, CR_AUTH_PLUGIN_ERR, unknown_sqlstate,
ER(CR_AUTH_PLUGIN_ERR), "sha256_password",
"Authentication requires SSL encryption");
DBUG_RETURN(CR_ERROR); // If no openssl support
#endif
}
else
{
/* The vio is encrypted already; just send the plain text passwd */
if (vio->write_packet(vio, (uchar*) mysql->passwd, passwd_len))
DBUG_RETURN(CR_ERROR);
}
memset(mysql->passwd, 0, passwd_len);
}
DBUG_RETURN(CR_OK);
}
#endif
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