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/*
Copyright (c) 2017, 2021, MariaDB
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 Street, Fifth Floor, Boston, MA 02110-1335 USA */
#include <mysql/plugin_auth.h>
#include <mysqld_error.h>
#include "common.h"
#if !defined(__attribute__) && !defined(__GNUC__)
#define __attribute__(A)
#endif
#define PASSWORD_LEN_BUF 44 /* base64 of 32 bytes */
#define PASSWORD_LEN 43 /* we won't store the last byte, padding '=' */
#define CRYPTO_LONGS (CRYPTO_BYTES/sizeof(long))
#define NONCE_LONGS (NONCE_BYTES/sizeof(long))
/************************** SERVER *************************************/
static int loaded= 0;
static int auth(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
{
int pkt_len;
unsigned long nonce[CRYPTO_LONGS + NONCE_LONGS];
unsigned char *pkt, *reply= (unsigned char*)nonce;
info->password_used= PASSWORD_USED_YES;
/* prepare random nonce */
if (my_random_bytes((unsigned char *)nonce, (int)sizeof(nonce)))
return CR_ERROR; // eh? OpenSSL error
/* send it */
if (vio->write_packet(vio, reply + CRYPTO_BYTES, NONCE_BYTES))
return CR_AUTH_HANDSHAKE;
/* read the signature */
if ((pkt_len= vio->read_packet(vio, &pkt)) != CRYPTO_BYTES)
return CR_AUTH_HANDSHAKE;
memcpy(reply, pkt, CRYPTO_BYTES);
if (crypto_sign_open(reply, CRYPTO_BYTES + NONCE_BYTES,
(unsigned char*)info->auth_string))
return CR_AUTH_USER_CREDENTIALS; // wrong password provided by the user
return CR_OK;
}
static int compute_password_digest(const char *pw, size_t pwlen,
char *d, size_t *dlen)
{
unsigned char pk[CRYPTO_PUBLICKEYBYTES];
if (*dlen < PASSWORD_LEN)
return 1;
*dlen= PASSWORD_LEN;
crypto_sign_keypair(pk, (unsigned char*)pw, pwlen);
my_base64_encode(pk, CRYPTO_PUBLICKEYBYTES, d);
return 0;
}
static int digest_to_binary(const char *d, size_t dlen,
unsigned char *b, size_t *blen)
{
char pw[PASSWORD_LEN_BUF];
if (*blen < CRYPTO_PUBLICKEYBYTES || dlen != PASSWORD_LEN)
{
my_printf_error(ER_PASSWD_LENGTH, "Password hash should be %d characters long", 0, PASSWORD_LEN);
return 1;
}
*blen= CRYPTO_PUBLICKEYBYTES;
memcpy(pw, d, PASSWORD_LEN);
pw[PASSWORD_LEN]= '=';
if (my_base64_decode(pw, PASSWORD_LEN_BUF, b, 0, 0) == CRYPTO_PUBLICKEYBYTES)
return 0;
my_printf_error(ER_PASSWD_LENGTH, "Password hash should be base64 encoded", 0);
return 1;
}
static struct st_mysql_auth info =
{
MYSQL_AUTHENTICATION_INTERFACE_VERSION,
"client_ed25519",
auth,
compute_password_digest,
digest_to_binary
};
static int init(void *p __attribute__((unused)))
{
loaded= 1;
return 0;
}
static int deinit(void *p __attribute__((unused)))
{
loaded= 0;
return 0;
}
maria_declare_plugin(ed25519)
{
MYSQL_AUTHENTICATION_PLUGIN,
&info,
"ed25519",
"Sergei Golubchik",
"Elliptic curve ED25519 based authentication",
PLUGIN_LICENSE_GPL,
init,
deinit,
0x0101,
NULL,
NULL,
"1.1",
MariaDB_PLUGIN_MATURITY_STABLE
}
maria_declare_plugin_end;
/************************** UDF ****************************************/
MYSQL_PLUGIN_EXPORT
char *ed25519_password(UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args, char *result, unsigned long *length,
unsigned char *is_null, unsigned char *error __attribute__((unused)))
{
unsigned char pk[CRYPTO_PUBLICKEYBYTES];
if ((*is_null= !args->args[0]))
return NULL;
*length= PASSWORD_LEN;
crypto_sign_keypair(pk, (unsigned char*)args->args[0], args->lengths[0]);
my_base64_encode(pk, CRYPTO_PUBLICKEYBYTES, result);
return result;
}
/*
At least one of _init/_deinit is needed unless the server is started
with --allow_suspicious_udfs.
*/
MYSQL_PLUGIN_EXPORT
my_bool ed25519_password_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
if (args->arg_count != 1 || args->arg_type[0] != STRING_RESULT)
{
strcpy(message,"Wrong arguments to ed25519_password()");
return 1;
}
if (!loaded)
{
/* cannot work unless the plugin is loaded, we need services. */
strcpy(message,"Authentication plugin ed25519 is not loaded");
return 1;
}
initid->max_length= PASSWORD_LEN_BUF;
return 0;
}
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