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SqMod/vendor/MDBC/plugins/auth/my_auth.c
Sandu Liviu Catalin b4bf96ce4b Add MariaDB Connector/C as a built-in alternative (v3.2.3).
2021-09-21 20:59:01 +03:00

686 lines
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#include <ma_global.h>
#include <ma_sys.h>
#include <errmsg.h>
#include <string.h>
#include <ma_common.h>
#include <mysql/client_plugin.h>
typedef struct st_mysql_client_plugin_AUTHENTICATION auth_plugin_t;
static int client_mpvio_write_packet(struct st_plugin_vio*, const uchar*, size_t);
static int native_password_auth_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql);
static int dummy_fallback_auth_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql __attribute__((unused)));
extern void read_user_name(char *name);
extern char *ma_send_connect_attr(MYSQL *mysql, unsigned char *buffer);
extern int ma_read_ok_packet(MYSQL *mysql, uchar *pos, ulong length);
extern unsigned char *mysql_net_store_length(unsigned char *packet, size_t length);
typedef struct {
int (*read_packet)(struct st_plugin_vio *vio, uchar **buf);
int (*write_packet)(struct st_plugin_vio *vio, const uchar *pkt, size_t pkt_len);
void (*info)(struct st_plugin_vio *vio, struct st_plugin_vio_info *info);
/* -= end of MYSQL_PLUGIN_VIO =- */
MYSQL *mysql;
auth_plugin_t *plugin; /**< what plugin we're under */
const char *db;
struct {
uchar *pkt; /**< pointer into NET::buff */
uint pkt_len;
} cached_server_reply;
uint packets_read, packets_written; /**< counters for send/received packets */
my_bool mysql_change_user; /**< if it's mysql_change_user() */
int last_read_packet_len; /**< the length of the last *read* packet */
} MCPVIO_EXT;
/*
#define compile_time_assert(A) \
do {\
typedef char constraint[(A) ? 1 : -1];\
} while (0);
*/
auth_plugin_t mysql_native_password_client_plugin=
{
MYSQL_CLIENT_AUTHENTICATION_PLUGIN,
MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION,
native_password_plugin_name,
"R.J.Silk, Sergei Golubchik",
"Native MySQL authentication",
{1, 0, 0},
"LGPL",
NULL,
NULL,
NULL,
NULL,
native_password_auth_client
};
static int native_password_auth_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql)
{
int pkt_len;
uchar *pkt;
if (((MCPVIO_EXT *)vio)->mysql_change_user)
{
/*
in mysql_change_user() the client sends the first packet.
we use the old scramble.
*/
pkt= (uchar*)mysql->scramble_buff;
pkt_len= SCRAMBLE_LENGTH + 1;
}
else
{
/* read the scramble */
if ((pkt_len= vio->read_packet(vio, &pkt)) < 0)
return CR_ERROR;
if (pkt_len != SCRAMBLE_LENGTH + 1)
return CR_SERVER_HANDSHAKE_ERR;
/* save it in MYSQL */
memmove(mysql->scramble_buff, pkt, SCRAMBLE_LENGTH);
mysql->scramble_buff[SCRAMBLE_LENGTH] = 0;
}
if (mysql && mysql->passwd[0])
{
char scrambled[SCRAMBLE_LENGTH + 1];
ma_scramble_41((uchar *)scrambled, (char*)pkt, mysql->passwd);
if (vio->write_packet(vio, (uchar*)scrambled, SCRAMBLE_LENGTH))
return CR_ERROR;
}
else
if (vio->write_packet(vio, 0, 0)) /* no password */
return CR_ERROR;
return CR_OK;
}
auth_plugin_t dummy_fallback_client_plugin=
{
MYSQL_CLIENT_AUTHENTICATION_PLUGIN,
MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION,
"dummy_fallback_auth",
"Sergei Golubchik",
"Dummy fallback plugin",
{1, 0, 0},
"LGPL",
NULL,
NULL,
NULL,
NULL,
dummy_fallback_auth_client
};
static int dummy_fallback_auth_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql __attribute__((unused)))
{
char last_error[MYSQL_ERRMSG_SIZE];
unsigned int i, last_errno= ((MCPVIO_EXT *)vio)->mysql->net.last_errno;
if (last_errno)
{
strncpy(last_error, ((MCPVIO_EXT *)vio)->mysql->net.last_error,
sizeof(last_error) - 1);
last_error[sizeof(last_error) - 1]= 0;
}
/* safety-wise we only do 10 round-trips */
for (i=0; i < 10; i++)
{
uchar *pkt;
if (vio->read_packet(vio, &pkt) < 0)
break;
if (vio->write_packet(vio, 0, 0))
break;
}
if (last_errno)
{
MYSQL *mysql= ((MCPVIO_EXT *)vio)->mysql;
strncpy(mysql->net.last_error, last_error,
sizeof(mysql->net.last_error) - 1);
mysql->net.last_error[sizeof(mysql->net.last_error) - 1]= 0;
}
return CR_ERROR;
}
static int send_change_user_packet(MCPVIO_EXT *mpvio,
const uchar *data, int data_len)
{
MYSQL *mysql= mpvio->mysql;
char *buff, *end;
int res= 1;
size_t conn_attr_len= (mysql->options.extension) ?
mysql->options.extension->connect_attrs_len : 0;
buff= malloc(USERNAME_LENGTH+1 + data_len+1 + NAME_LEN+1 + 2 + NAME_LEN+1 + 9 + conn_attr_len);
end= ma_strmake(buff, mysql->user, USERNAME_LENGTH) + 1;
if (!data_len)
*end++= 0;
else
{
if (mysql->client_flag & CLIENT_SECURE_CONNECTION)
{
DBUG_ASSERT(data_len <= 255);
if (data_len > 255)
{
my_set_error(mysql, CR_MALFORMED_PACKET, SQLSTATE_UNKNOWN, 0);
goto error;
}
*end++= data_len;
}
else
{
DBUG_ASSERT(data_len == SCRAMBLE_LENGTH_323 + 1);
DBUG_ASSERT(data[SCRAMBLE_LENGTH_323] == 0);
}
memcpy(end, data, data_len);
end+= data_len;
}
end= ma_strmake(end, mpvio->db ? mpvio->db : "", NAME_LEN) + 1;
if (mysql->server_capabilities & CLIENT_PROTOCOL_41)
{
int2store(end, (ushort) mysql->charset->nr);
end+= 2;
}
if (mysql->server_capabilities & CLIENT_PLUGIN_AUTH)
end= ma_strmake(end, mpvio->plugin->name, NAME_LEN) + 1;
end= ma_send_connect_attr(mysql, (unsigned char *)end);
res= ma_simple_command(mysql, COM_CHANGE_USER,
buff, (ulong)(end-buff), 1, NULL);
error:
free(buff);
return res;
}
static int send_client_reply_packet(MCPVIO_EXT *mpvio,
const uchar *data, int data_len)
{
MYSQL *mysql= mpvio->mysql;
NET *net= &mysql->net;
char *buff, *end;
size_t conn_attr_len= (mysql->options.extension) ?
mysql->options.extension->connect_attrs_len : 0;
/* see end= buff+32 below, fixed size of the packet is 32 bytes */
buff= malloc(33 + USERNAME_LENGTH + data_len + NAME_LEN + NAME_LEN + conn_attr_len + 9);
end= buff;
mysql->client_flag|= mysql->options.client_flag;
mysql->client_flag|= CLIENT_CAPABILITIES;
if (mysql->client_flag & CLIENT_MULTI_STATEMENTS)
mysql->client_flag|= CLIENT_MULTI_RESULTS;
#if defined(HAVE_TLS) && !defined(EMBEDDED_LIBRARY)
if (mysql->options.ssl_key || mysql->options.ssl_cert ||
mysql->options.ssl_ca || mysql->options.ssl_capath ||
mysql->options.ssl_cipher || mysql->options.use_ssl ||
(mysql->options.client_flag & CLIENT_SSL_VERIFY_SERVER_CERT))
mysql->options.use_ssl= 1;
if (mysql->options.use_ssl)
mysql->client_flag|= CLIENT_SSL;
#endif /* HAVE_TLS && !EMBEDDED_LIBRARY*/
if (mpvio->db)
mysql->client_flag|= CLIENT_CONNECT_WITH_DB;
else
/* See CONC-490: If no database was specified, we need
to unset CLIENT_CONNECT_WITH_DB flag */
mysql->client_flag&= ~CLIENT_CONNECT_WITH_DB;
/* if server doesn't support SSL and verification of server certificate
was set to mandatory, we need to return an error */
if (mysql->options.use_ssl && !(mysql->server_capabilities & CLIENT_SSL))
{
if ((mysql->client_flag & CLIENT_SSL_VERIFY_SERVER_CERT) ||
(mysql->options.extension && (mysql->options.extension->tls_fp ||
mysql->options.extension->tls_fp_list)))
{
my_set_error(mysql, CR_SSL_CONNECTION_ERROR, SQLSTATE_UNKNOWN,
ER(CR_SSL_CONNECTION_ERROR),
"SSL is required, but the server does not support it");
goto error;
}
}
/* Remove options that server doesn't support */
mysql->client_flag= mysql->client_flag &
(~(CLIENT_COMPRESS | CLIENT_SSL | CLIENT_PROTOCOL_41)
| mysql->server_capabilities);
#ifndef HAVE_COMPRESS
mysql->client_flag&= ~CLIENT_COMPRESS;
#endif
if (mysql->client_flag & CLIENT_PROTOCOL_41)
{
/* 4.1 server and 4.1 client has a 32 byte option flag */
if (!(mysql->server_capabilities & CLIENT_MYSQL))
mysql->client_flag&= ~CLIENT_MYSQL;
int4store(buff,mysql->client_flag);
int4store(buff+4, net->max_packet_size);
buff[8]= (char) mysql->charset->nr;
memset(buff + 9, 0, 32-9);
if (!(mysql->server_capabilities & CLIENT_MYSQL))
{
uint server_extended_cap= mysql->extension->mariadb_server_capabilities;
uint client_extended_cap= (uint)(MARIADB_CLIENT_SUPPORTED_FLAGS >> 32);
mysql->extension->mariadb_client_flag=
server_extended_cap & client_extended_cap;
int4store(buff + 28, mysql->extension->mariadb_client_flag);
}
end= buff+32;
}
else
{
int2store(buff, mysql->client_flag);
int3store(buff+2, net->max_packet_size);
end= buff+5;
}
#ifdef HAVE_TLS
if (mysql->options.ssl_key ||
mysql->options.ssl_cert ||
mysql->options.ssl_ca ||
mysql->options.ssl_capath ||
mysql->options.ssl_cipher
#ifdef CRL_IMPLEMENTED
|| (mysql->options.extension &&
(mysql->options.extension->ssl_crl ||
mysql->options.extension->ssl_crlpath))
#endif
)
mysql->options.use_ssl= 1;
if (mysql->options.use_ssl &&
(mysql->client_flag & CLIENT_SSL))
{
/*
Send mysql->client_flag, max_packet_size - unencrypted otherwise
the server does not know we want to do SSL
*/
if (ma_net_write(net, (unsigned char *)buff, (size_t) (end-buff)) || ma_net_flush(net))
{
my_set_error(mysql, CR_SERVER_LOST, SQLSTATE_UNKNOWN,
ER(CR_SERVER_LOST_EXTENDED),
"sending connection information to server",
errno);
goto error;
}
if (ma_pvio_start_ssl(mysql->net.pvio))
goto error;
}
#endif /* HAVE_TLS */
/* This needs to be changed as it's not useful with big packets */
if (mysql->user && mysql->user[0])
ma_strmake(end, mysql->user, USERNAME_LENGTH);
else
read_user_name(end);
/* We have to handle different version of handshake here */
end+= strlen(end) + 1;
if (data_len)
{
if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
{
if (mysql->server_capabilities & CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA)
{
end= (char *)mysql_net_store_length((uchar *)end, data_len);
}
else {
/* Without CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA capability password
length is limited up to 255 chars */
if (data_len > 0xFF)
goto error;
*end++= data_len;
}
memcpy(end, data, data_len);
end+= data_len;
}
else
{
DBUG_ASSERT(data_len == SCRAMBLE_LENGTH_323 + 1); /* incl. \0 at the end */
memcpy(end, data, data_len);
end+= data_len;
}
}
else
*end++= 0;
/* Add database if needed */
if (mpvio->db && (mysql->server_capabilities & CLIENT_CONNECT_WITH_DB))
{
end= ma_strmake(end, mpvio->db, NAME_LEN) + 1;
mysql->db= strdup(mpvio->db);
}
if (mysql->server_capabilities & CLIENT_PLUGIN_AUTH)
end= ma_strmake(end, mpvio->plugin->name, NAME_LEN) + 1;
end= ma_send_connect_attr(mysql, (unsigned char *)end);
/* Write authentication package */
if (ma_net_write(net, (unsigned char *)buff, (size_t) (end-buff)) || ma_net_flush(net))
{
my_set_error(mysql, CR_SERVER_LOST, SQLSTATE_UNKNOWN,
ER(CR_SERVER_LOST_EXTENDED),
"sending authentication information",
errno);
goto error;
}
free(buff);
return 0;
error:
free(buff);
return 1;
}
/**
vio->read_packet() callback method for client authentication plugins
This function is called by a client authentication plugin, when it wants
to read data from the server.
*/
static int client_mpvio_read_packet(struct st_plugin_vio *mpv, uchar **buf)
{
MCPVIO_EXT *mpvio= (MCPVIO_EXT*)mpv;
MYSQL *mysql= mpvio->mysql;
ulong pkt_len;
/* there are cached data left, feed it to a plugin */
if (mpvio->cached_server_reply.pkt)
{
*buf= mpvio->cached_server_reply.pkt;
mpvio->cached_server_reply.pkt= 0;
mpvio->packets_read++;
return mpvio->cached_server_reply.pkt_len;
}
if (mpvio->packets_read == 0)
{
/*
the server handshake packet came from the wrong plugin,
or it's mysql_change_user(). Either way, there is no data
for a plugin to read. send a dummy packet to the server
to initiate a dialog.
*/
if (client_mpvio_write_packet(mpv, 0, 0))
return (int)packet_error;
}
/* otherwise read the data */
if ((pkt_len= ma_net_safe_read(mysql)) == packet_error)
return (int)packet_error;
mpvio->last_read_packet_len= pkt_len;
*buf= mysql->net.read_pos;
/* was it a request to change plugins ? */
if (pkt_len && **buf == 254)
return (int)packet_error; /* if yes, this plugin shan't continue */
/*
the server sends \1\255 or \1\254 instead of just \255 or \254 -
for us to not confuse it with an error or "change plugin" packets.
We remove this escaping \1 here.
See also server_mpvio_write_packet() where the escaping is done.
*/
if (pkt_len && **buf == 1)
{
(*buf)++;
pkt_len--;
}
mpvio->packets_read++;
return pkt_len;
}
/**
vio->write_packet() callback method for client authentication plugins
This function is called by a client authentication plugin, when it wants
to send data to the server.
It transparently wraps the data into a change user or authentication
handshake packet, if necessary.
*/
static int client_mpvio_write_packet(struct st_plugin_vio *mpv,
const uchar *pkt, size_t pkt_len)
{
int res;
MCPVIO_EXT *mpvio= (MCPVIO_EXT*)mpv;
if (mpvio->packets_written == 0)
{
if (mpvio->mysql_change_user)
res= send_change_user_packet(mpvio, pkt, (int)pkt_len);
else
res= send_client_reply_packet(mpvio, pkt, (int)pkt_len);
}
else
{
NET *net= &mpvio->mysql->net;
if (mpvio->mysql->thd)
res= 1; /* no chit-chat in embedded */
else
res= ma_net_write(net, (unsigned char *)pkt, pkt_len) || ma_net_flush(net);
}
if (res)
{
/* don't overwrite errors */
if (!mysql_errno(mpvio->mysql))
my_set_error(mpvio->mysql, CR_SERVER_LOST, SQLSTATE_UNKNOWN,
ER(CR_SERVER_LOST_EXTENDED),
"sending authentication information",
errno);
}
mpvio->packets_written++;
return res;
}
/**
fills MYSQL_PLUGIN_VIO_INFO structure with the information about the
connection
*/
void mpvio_info(MARIADB_PVIO *pvio, MYSQL_PLUGIN_VIO_INFO *info)
{
memset(info, 0, sizeof(*info));
switch (pvio->type) {
case PVIO_TYPE_SOCKET:
info->protocol= MYSQL_VIO_TCP;
ma_pvio_get_handle(pvio, &info->socket);
return;
case PVIO_TYPE_UNIXSOCKET:
info->protocol= MYSQL_VIO_SOCKET;
ma_pvio_get_handle(pvio, &info->socket);
return;
/*
case VIO_TYPE_SSL:
{
struct sockaddr addr;
SOCKET_SIZE_TYPE addrlen= sizeof(addr);
if (getsockname(vio->sd, &addr, &addrlen))
return;
info->protocol= addr.sa_family == AF_UNIX ?
MYSQL_VIO_SOCKET : MYSQL_VIO_TCP;
info->socket= vio->sd;
return;
}
*/
#ifdef _WIN32
/*
case VIO_TYPE_NAMEDPIPE:
info->protocol= MYSQL_VIO_PIPE;
info->handle= vio->hPipe;
return;
*/
/* not supported yet
case VIO_TYPE_SHARED_MEMORY:
info->protocol= MYSQL_VIO_MEMORY;
info->handle= vio->handle_file_map;
return;
*/
#endif
default: DBUG_ASSERT(0);
}
}
static void client_mpvio_info(MYSQL_PLUGIN_VIO *vio,
MYSQL_PLUGIN_VIO_INFO *info)
{
MCPVIO_EXT *mpvio= (MCPVIO_EXT*)vio;
mpvio_info(mpvio->mysql->net.pvio, info);
}
/**
Client side of the plugin driver authentication.
@note this is used by both the mysql_real_connect and mysql_change_user
@param mysql mysql
@param data pointer to the plugin auth data (scramble) in the
handshake packet
@param data_len the length of the data
@param data_plugin a plugin that data were prepared for
or 0 if it's mysql_change_user()
@param db initial db to use, can be 0
@retval 0 ok
@retval 1 error
*/
int run_plugin_auth(MYSQL *mysql, char *data, uint data_len,
const char *data_plugin, const char *db)
{
const char *auth_plugin_name= NULL;
auth_plugin_t *auth_plugin;
MCPVIO_EXT mpvio;
ulong pkt_length;
int res;
/* determine the default/initial plugin to use */
if (mysql->server_capabilities & CLIENT_PLUGIN_AUTH)
{
if (mysql->options.extension && mysql->options.extension->default_auth)
auth_plugin_name= mysql->options.extension->default_auth;
else if (data_plugin)
auth_plugin_name= data_plugin;
}
if (!auth_plugin_name)
{
if (mysql->server_capabilities & CLIENT_PROTOCOL_41)
auth_plugin_name= native_password_plugin_name;
else
auth_plugin_name= "mysql_old_password";
}
if (!(auth_plugin= (auth_plugin_t*) mysql_client_find_plugin(mysql,
auth_plugin_name, MYSQL_CLIENT_AUTHENTICATION_PLUGIN)))
auth_plugin= &dummy_fallback_client_plugin;
mysql->net.last_errno= 0; /* just in case */
if (data_plugin && strcmp(data_plugin, auth_plugin_name))
{
/* data was prepared for a different plugin, so we don't
send any data */
data= 0;
data_len= 0;
}
mpvio.mysql_change_user= data_plugin == 0;
mpvio.cached_server_reply.pkt= (uchar*)data;
mpvio.cached_server_reply.pkt_len= data_len;
mpvio.read_packet= client_mpvio_read_packet;
mpvio.write_packet= client_mpvio_write_packet;
mpvio.info= client_mpvio_info;
mpvio.mysql= mysql;
mpvio.packets_read= mpvio.packets_written= 0;
mpvio.db= db;
retry:
mpvio.plugin= auth_plugin;
mysql->net.read_pos[0]= 0;
res= auth_plugin->authenticate_user((struct st_plugin_vio *)&mpvio, mysql);
if ((res == CR_ERROR && !mysql->net.buff) ||
(res > CR_OK && mysql->net.read_pos[0] != 254))
{
/*
the plugin returned an error. write it down in mysql,
unless the error code is CR_ERROR and mysql->net.last_errno
is already set (the plugin has done it)
*/
if (res > CR_ERROR)
my_set_error(mysql, res, SQLSTATE_UNKNOWN, 0);
else
if (!mysql->net.last_errno) {
my_set_error(mysql, CR_UNKNOWN_ERROR, SQLSTATE_UNKNOWN, 0);
}
return 1;
}
/* read the OK packet (or use the cached value in mysql->net.read_pos */
if (res == CR_OK)
pkt_length= ma_net_safe_read(mysql);
else /* res == CR_OK_HANDSHAKE_COMPLETE or an error */
pkt_length= mpvio.last_read_packet_len;
if (pkt_length == packet_error)
{
if (mysql->net.last_errno == CR_SERVER_LOST)
my_set_error(mysql, CR_SERVER_LOST, SQLSTATE_UNKNOWN,
ER(CR_SERVER_LOST_EXTENDED),
"reading authorization packet",
errno);
return 1;
}
if (mysql->net.read_pos[0] == 254)
{
/* The server asked to use a different authentication plugin */
if (pkt_length == 1)
{
/* old "use short scramble" packet */
auth_plugin_name= old_password_plugin_name;
mpvio.cached_server_reply.pkt= (uchar*)mysql->scramble_buff;
mpvio.cached_server_reply.pkt_len= SCRAMBLE_LENGTH + 1;
}
else
{
/* new "use different plugin" packet */
uint len;
auth_plugin_name= (char*)mysql->net.read_pos + 1;
len= (uint)strlen(auth_plugin_name); /* safe as ma_net_read always appends \0 */
mpvio.cached_server_reply.pkt_len= pkt_length - len - 2;
mpvio.cached_server_reply.pkt= mysql->net.read_pos + len + 2;
}
if (!(auth_plugin= (auth_plugin_t *) mysql_client_find_plugin(mysql,
auth_plugin_name, MYSQL_CLIENT_AUTHENTICATION_PLUGIN)))
auth_plugin= &dummy_fallback_client_plugin;
goto retry;
}
/*
net->read_pos[0] should always be 0 here if the server implements
the protocol correctly
*/
if (mysql->net.read_pos[0] == 0)
return ma_read_ok_packet(mysql, mysql->net.read_pos + 1, pkt_length);
return 1;
}
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