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mariadb/sql/sql_connect.cc
cmiller@zippy.cornsilk.net 19b54e394f Bug#28984: crasher on connect with out of range password length in \ 
protocol

Update for function moved to new file in 5.1.

One could send a malformed packet that caused the server to SEGV.  In 
recent versions of the password protocol, the client tells the server 
what length the ciphertext is (almost always 20).  If that length was
large enough to overflow a signed char, then the number would jump to 
very large after being casted to unsigned int.
  
Instead, cast the *passwd char to uchar.
2007-06-11 16:03:05 -04:00

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/* Copyright (C) 2007 MySQL 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
Functions to autenticate and handle reqests for a connection
*/
#include "mysql_priv.h"
#ifdef HAVE_OPENSSL
/*
Without SSL the handshake consists of one packet. This packet
has both client capabilites and scrambled password.
With SSL the handshake might consist of two packets. If the first
packet (client capabilities) has CLIENT_SSL flag set, we have to
switch to SSL and read the second packet. The scrambled password
is in the second packet and client_capabilites field will be ignored.
Maybe it is better to accept flags other than CLIENT_SSL from the
second packet?
*/
#define SSL_HANDSHAKE_SIZE 2
#define NORMAL_HANDSHAKE_SIZE 6
#define MIN_HANDSHAKE_SIZE 2
#else
#define MIN_HANDSHAKE_SIZE 6
#endif /* HAVE_OPENSSL */
#ifdef __WIN__
static void test_signal(int sig_ptr)
{
#if !defined( DBUG_OFF)
MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
#if defined(OS2)
fprintf(stderr, "Test signal %d\n", sig_ptr);
fflush(stderr);
#endif
}
static void init_signals(void)
{
int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
for (int i=0 ; i < 7 ; i++)
signal( signals[i], test_signal) ;
}
#endif
/*
Get structure for logging connection data for the current user
*/
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static HASH hash_user_connections;
static int get_or_create_user_conn(THD *thd, const char *user,
const char *host,
USER_RESOURCES *mqh)
{
int return_val= 0;
uint temp_len, user_len;
char temp_user[USER_HOST_BUFF_SIZE];
struct user_conn *uc;
DBUG_ASSERT(user != 0);
DBUG_ASSERT(host != 0);
user_len= strlen(user);
temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
(void) pthread_mutex_lock(&LOCK_user_conn);
if (!(uc = (struct user_conn *) hash_search(&hash_user_connections,
(uchar*) temp_user, temp_len)))
{
/* First connection for user; Create a user connection object */
if (!(uc= ((struct user_conn*)
my_malloc(sizeof(struct user_conn) + temp_len+1,
MYF(MY_WME)))))
{
net_send_error(thd, 0, NullS); // Out of memory
return_val= 1;
goto end;
}
uc->user=(char*) (uc+1);
memcpy(uc->user,temp_user,temp_len+1);
uc->host= uc->user + user_len + 1;
uc->len= temp_len;
uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0;
uc->user_resources= *mqh;
uc->intime= thd->thr_create_time;
if (my_hash_insert(&hash_user_connections, (uchar*) uc))
{
my_free((char*) uc,0);
net_send_error(thd, 0, NullS); // Out of memory
return_val= 1;
goto end;
}
}
thd->user_connect=uc;
uc->connections++;
end:
(void) pthread_mutex_unlock(&LOCK_user_conn);
return return_val;
}
/*
check if user has already too many connections
SYNOPSIS
check_for_max_user_connections()
thd Thread handle
uc User connect object
NOTES
If check fails, we decrease user connection count, which means one
shouldn't call decrease_user_connections() after this function.
RETURN
0 ok
1 error
*/
int check_for_max_user_connections(THD *thd, USER_CONN *uc)
{
int error=0;
DBUG_ENTER("check_for_max_user_connections");
(void) pthread_mutex_lock(&LOCK_user_conn);
if (max_user_connections && !uc->user_resources.user_conn &&
max_user_connections < (uint) uc->connections)
{
net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user);
error=1;
goto end;
}
time_out_user_resource_limits(thd, uc);
if (uc->user_resources.user_conn &&
uc->user_resources.user_conn < uc->connections)
{
net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
"max_user_connections",
(long) uc->user_resources.user_conn);
error= 1;
goto end;
}
if (uc->user_resources.conn_per_hour &&
uc->user_resources.conn_per_hour <= uc->conn_per_hour)
{
net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
"max_connections_per_hour",
(long) uc->user_resources.conn_per_hour);
error=1;
goto end;
}
uc->conn_per_hour++;
end:
if (error)
uc->connections--; // no need for decrease_user_connections() here
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_RETURN(error);
}
/*
Decrease user connection count
SYNOPSIS
decrease_user_connections()
uc User connection object
NOTES
If there is a n user connection object for a connection
(which only happens if 'max_user_connections' is defined or
if someone has created a resource grant for a user), then
the connection count is always incremented on connect.
The user connect object is not freed if some users has
'max connections per hour' defined as we need to be able to hold
count over the lifetime of the connection.
*/
void decrease_user_connections(USER_CONN *uc)
{
DBUG_ENTER("decrease_user_connections");
(void) pthread_mutex_lock(&LOCK_user_conn);
DBUG_ASSERT(uc->connections);
if (!--uc->connections && !mqh_used)
{
/* Last connection for user; Delete it */
(void) hash_delete(&hash_user_connections,(uchar*) uc);
}
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_VOID_RETURN;
}
/*
Reset per-hour user resource limits when it has been more than
an hour since they were last checked
SYNOPSIS:
time_out_user_resource_limits()
thd Thread handler
uc User connection details
NOTE:
This assumes that the LOCK_user_conn mutex has been acquired, so it is
safe to test and modify members of the USER_CONN structure.
*/
void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
{
time_t check_time = thd->start_time ? thd->start_time : time(NULL);
DBUG_ENTER("time_out_user_resource_limits");
/* If more than a hour since last check, reset resource checking */
if (check_time - uc->intime >= 3600)
{
uc->questions=1;
uc->updates=0;
uc->conn_per_hour=0;
uc->intime=check_time;
}
DBUG_VOID_RETURN;
}
/*
Check if maximum queries per hour limit has been reached
returns 0 if OK.
*/
bool check_mqh(THD *thd, uint check_command)
{
bool error= 0;
USER_CONN *uc=thd->user_connect;
DBUG_ENTER("check_mqh");
DBUG_ASSERT(uc != 0);
(void) pthread_mutex_lock(&LOCK_user_conn);
time_out_user_resource_limits(thd, uc);
/* Check that we have not done too many questions / hour */
if (uc->user_resources.questions &&
uc->questions++ >= uc->user_resources.questions)
{
net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
(long) uc->user_resources.questions);
error=1;
goto end;
}
if (check_command < (uint) SQLCOM_END)
{
/* Check that we have not done too many updates / hour */
if (uc->user_resources.updates &&
(sql_command_flags[check_command] & CF_CHANGES_DATA) &&
uc->updates++ >= uc->user_resources.updates)
{
net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
(long) uc->user_resources.updates);
error=1;
goto end;
}
}
end:
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_RETURN(error);
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
/*
Check if user exist and password supplied is correct.
SYNOPSIS
check_user()
thd thread handle, thd->security_ctx->{host,user,ip} are used
command originator of the check: now check_user is called
during connect and change user procedures; used for
logging.
passwd scrambled password received from client
passwd_len length of scrambled password
db database name to connect to, may be NULL
check_count dont know exactly
Note, that host, user and passwd may point to communication buffer.
Current implementation does not depend on that, but future changes
should be done with this in mind; 'thd' is INOUT, all other params
are 'IN'.
RETURN VALUE
0 OK; thd->security_ctx->user/master_access/priv_user/db_access and
thd->db are updated; OK is sent to client;
-1 access denied or handshake error; error is sent to client;
>0 error, not sent to client
*/
int check_user(THD *thd, enum enum_server_command command,
const char *passwd, uint passwd_len, const char *db,
bool check_count)
{
DBUG_ENTER("check_user");
LEX_STRING db_str= { (char *) db, db ? strlen(db) : 0 };
#ifdef NO_EMBEDDED_ACCESS_CHECKS
thd->main_security_ctx.master_access= GLOBAL_ACLS; // Full rights
/* Change database if necessary */
if (db && db[0])
{
/*
thd->db is saved in caller and needs to be freed by caller if this
function returns 0
*/
thd->reset_db(NULL, 0);
if (mysql_change_db(thd, &db_str, FALSE))
{
/* Send the error to the client */
net_send_error(thd);
DBUG_RETURN(-1);
}
}
send_ok(thd);
DBUG_RETURN(0);
#else
my_bool opt_secure_auth_local;
pthread_mutex_lock(&LOCK_global_system_variables);
opt_secure_auth_local= opt_secure_auth;
pthread_mutex_unlock(&LOCK_global_system_variables);
/*
If the server is running in secure auth mode, short scrambles are
forbidden.
*/
if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
{
net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
DBUG_RETURN(-1);
}
if (passwd_len != 0 &&
passwd_len != SCRAMBLE_LENGTH &&
passwd_len != SCRAMBLE_LENGTH_323)
DBUG_RETURN(ER_HANDSHAKE_ERROR);
/*
Clear thd->db as it points to something, that will be freed when
connection is closed. We don't want to accidentally free a wrong pointer
if connect failed. Also in case of 'CHANGE USER' failure, current
database will be switched to 'no database selected'.
*/
thd->reset_db(NULL, 0);
USER_RESOURCES ur;
int res= acl_getroot(thd, &ur, passwd, passwd_len);
#ifndef EMBEDDED_LIBRARY
if (res == -1)
{
/*
This happens when client (new) sends password scrambled with
scramble(), but database holds old value (scrambled with
scramble_323()). Here we please client to send scrambled_password
in old format.
*/
NET *net= &thd->net;
if (opt_secure_auth_local)
{
net_printf_error(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip);
general_log_print(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip);
DBUG_RETURN(-1);
}
/* We have to read very specific packet size */
if (send_old_password_request(thd) ||
my_net_read(net) != SCRAMBLE_LENGTH_323 + 1)
{
inc_host_errors(&thd->remote.sin_addr);
DBUG_RETURN(ER_HANDSHAKE_ERROR);
}
/* Final attempt to check the user based on reply */
/* So as passwd is short, errcode is always >= 0 */
res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
}
#endif /*EMBEDDED_LIBRARY*/
/* here res is always >= 0 */
if (res == 0)
{
if (!(thd->main_security_ctx.master_access &
NO_ACCESS)) // authentication is OK
{
DBUG_PRINT("info",
("Capabilities: %lu packet_length: %ld Host: '%s' "
"Login user: '%s' Priv_user: '%s' Using password: %s "
"Access: %lu db: '%s'",
thd->client_capabilities,
thd->max_client_packet_length,
thd->main_security_ctx.host_or_ip,
thd->main_security_ctx.user,
thd->main_security_ctx.priv_user,
passwd_len ? "yes": "no",
thd->main_security_ctx.master_access,
(thd->db ? thd->db : "*none*")));
if (check_count)
{
VOID(pthread_mutex_lock(&LOCK_thread_count));
bool count_ok= thread_count <= max_connections + delayed_insert_threads
|| (thd->main_security_ctx.master_access & SUPER_ACL);
VOID(pthread_mutex_unlock(&LOCK_thread_count));
if (!count_ok)
{ // too many connections
net_send_error(thd, ER_CON_COUNT_ERROR);
DBUG_RETURN(-1);
}
}
/*
Log the command before authentication checks, so that the user can
check the log for the tried login tried and also to detect
break-in attempts.
*/
general_log_print(thd, command,
(thd->main_security_ctx.priv_user ==
thd->main_security_ctx.user ?
(char*) "%s@%s on %s" :
(char*) "%s@%s as anonymous on %s"),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip,
db ? db : (char*) "");
/*
This is the default access rights for the current database. It's
set to 0 here because we don't have an active database yet (and we
may not have an active database to set.
*/
thd->main_security_ctx.db_access=0;
/* Don't allow user to connect if he has done too many queries */
if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
max_user_connections) &&
get_or_create_user_conn(thd,
(opt_old_style_user_limits ? thd->main_security_ctx.user :
thd->main_security_ctx.priv_user),
(opt_old_style_user_limits ? thd->main_security_ctx.host_or_ip :
thd->main_security_ctx.priv_host),
&ur))
DBUG_RETURN(-1);
if (thd->user_connect &&
(thd->user_connect->user_resources.conn_per_hour ||
thd->user_connect->user_resources.user_conn ||
max_user_connections) &&
check_for_max_user_connections(thd, thd->user_connect))
DBUG_RETURN(-1);
/* Change database if necessary */
if (db && db[0])
{
if (mysql_change_db(thd, &db_str, FALSE))
{
/* Send error to the client */
net_send_error(thd);
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
DBUG_RETURN(-1);
}
}
send_ok(thd);
thd->password= test(passwd_len); // remember for error messages
/* Ready to handle queries */
DBUG_RETURN(0);
}
}
else if (res == 2) // client gave short hash, server has long hash
{
net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
DBUG_RETURN(-1);
}
net_printf_error(thd, ER_ACCESS_DENIED_ERROR,
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip,
passwd_len ? ER(ER_YES) : ER(ER_NO));
general_log_print(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip,
passwd_len ? ER(ER_YES) : ER(ER_NO));
DBUG_RETURN(-1);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
Check for maximum allowable user connections, if the mysqld server is
started with corresponding variable that is greater then 0.
*/
extern "C" uchar *get_key_conn(user_conn *buff, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length= buff->len;
return (uchar*) buff->user;
}
extern "C" void free_user(struct user_conn *uc)
{
my_free((char*) uc,MYF(0));
}
void init_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
(void) hash_init(&hash_user_connections,system_charset_info,max_connections,
0,0,
(hash_get_key) get_key_conn, (hash_free_key) free_user,
0);
#endif
}
void free_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
hash_free(&hash_user_connections);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
void reset_mqh(LEX_USER *lu, bool get_them= 0)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
(void) pthread_mutex_lock(&LOCK_user_conn);
if (lu) // for GRANT
{
USER_CONN *uc;
uint temp_len=lu->user.length+lu->host.length+2;
char temp_user[USER_HOST_BUFF_SIZE];
memcpy(temp_user,lu->user.str,lu->user.length);
memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
if ((uc = (struct user_conn *) hash_search(&hash_user_connections,
(uchar*) temp_user, temp_len)))
{
uc->questions=0;
get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
uc->updates=0;
uc->conn_per_hour=0;
}
}
else
{
/* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
for (uint idx=0;idx < hash_user_connections.records; idx++)
{
USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
idx);
if (get_them)
get_mqh(uc->user,uc->host,uc);
uc->questions=0;
uc->updates=0;
uc->conn_per_hour=0;
}
}
(void) pthread_mutex_unlock(&LOCK_user_conn);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
void thd_init_client_charset(THD *thd, uint cs_number)
{
/*
Use server character set and collation if
- opt_character_set_client_handshake is not set
- client has not specified a character set
- client character set is the same as the servers
- client character set doesn't exists in server
*/
if (!opt_character_set_client_handshake ||
!(thd->variables.character_set_client= get_charset(cs_number, MYF(0))) ||
!my_strcasecmp(&my_charset_latin1,
global_system_variables.character_set_client->name,
thd->variables.character_set_client->name))
{
thd->variables.character_set_client=
global_system_variables.character_set_client;
thd->variables.collation_connection=
global_system_variables.collation_connection;
thd->variables.character_set_results=
global_system_variables.character_set_results;
}
else
{
thd->variables.character_set_results=
thd->variables.collation_connection=
thd->variables.character_set_client;
}
}
/*
Initialize connection threads
*/
bool init_new_connection_handler_thread()
{
pthread_detach_this_thread();
#if defined(__WIN__)
init_signals();
#else
/* Win32 calls this in pthread_create */
if (my_thread_init())
return 1;
#endif /* __WIN__ */
return 0;
}
/*
Perform handshake, authorize client and update thd ACL variables.
SYNOPSIS
check_connection()
thd thread handle
RETURN
0 success, OK is sent to user, thd is updated.
-1 error, which is sent to user
> 0 error code (not sent to user)
*/
#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
{
uint connect_errors= 0;
NET *net= &thd->net;
ulong pkt_len= 0;
char *end;
DBUG_PRINT("info",
("New connection received on %s", vio_description(net->vio)));
#ifdef SIGNAL_WITH_VIO_CLOSE
thd->set_active_vio(net->vio);
#endif
if (!thd->main_security_ctx.host) // If TCP/IP connection
{
char ip[30];
if (vio_peer_addr(net->vio, ip, &thd->peer_port))
return (ER_BAD_HOST_ERROR);
if (!(thd->main_security_ctx.ip= my_strdup(ip,MYF(0))))
return (ER_OUT_OF_RESOURCES);
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.ip;
vio_in_addr(net->vio,&thd->remote.sin_addr);
if (!(specialflag & SPECIAL_NO_RESOLVE))
{
vio_in_addr(net->vio,&thd->remote.sin_addr);
thd->main_security_ctx.host=
ip_to_hostname(&thd->remote.sin_addr, &connect_errors);
/* Cut very long hostnames to avoid possible overflows */
if (thd->main_security_ctx.host)
{
if (thd->main_security_ctx.host != my_localhost)
thd->main_security_ctx.host[min(strlen(thd->main_security_ctx.host),
HOSTNAME_LENGTH)]= 0;
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
}
if (connect_errors > max_connect_errors)
return(ER_HOST_IS_BLOCKED);
}
DBUG_PRINT("info",("Host: %s ip: %s",
(thd->main_security_ctx.host ?
thd->main_security_ctx.host : "unknown host"),
(thd->main_security_ctx.ip ?
thd->main_security_ctx.ip : "unknown ip")));
if (acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip))
return(ER_HOST_NOT_PRIVILEGED);
}
else /* Hostname given means that the connection was on a socket */
{
DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host));
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
thd->main_security_ctx.ip= 0;
/* Reset sin_addr */
bzero((char*) &thd->remote, sizeof(thd->remote));
}
vio_keepalive(net->vio, TRUE);
{
/* buff[] needs to big enough to hold the server_version variable */
char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
if (opt_using_transactions)
client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
#ifdef HAVE_OPENSSL
if (ssl_acceptor_fd)
client_flags |= CLIENT_SSL; /* Wow, SSL is available! */
#endif /* HAVE_OPENSSL */
end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
int4store((uchar*) end, thd->thread_id);
end+= 4;
/*
So as check_connection is the only entry point to authorization
procedure, scramble is set here. This gives us new scramble for
each handshake.
*/
create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
/*
Old clients does not understand long scrambles, but can ignore packet
tail: that's why first part of the scramble is placed here, and second
part at the end of packet.
*/
end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
int2store(end, client_flags);
/* write server characteristics: up to 16 bytes allowed */
end[2]=(char) default_charset_info->number;
int2store(end+3, thd->server_status);
bzero(end+5, 13);
end+= 18;
/* write scramble tail */
end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323,
SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;
/* At this point we write connection message and read reply */
if (net_write_command(net, (uchar) protocol_version, (uchar*) "", 0,
(uchar*) buff, (size_t) (end-buff)) ||
(pkt_len= my_net_read(net)) == packet_error ||
pkt_len < MIN_HANDSHAKE_SIZE)
{
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
}
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
if (connect_errors)
reset_host_errors(&thd->remote.sin_addr);
if (thd->packet.alloc(thd->variables.net_buffer_length))
return(ER_OUT_OF_RESOURCES);
thd->client_capabilities=uint2korr(net->read_pos);
if (thd->client_capabilities & CLIENT_PROTOCOL_41)
{
thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
thd->max_client_packet_length= uint4korr(net->read_pos+4);
DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
thd_init_client_charset(thd, (uint) net->read_pos[8]);
thd->update_charset();
end= (char*) net->read_pos+32;
}
else
{
thd->max_client_packet_length= uint3korr(net->read_pos+2);
end= (char*) net->read_pos+5;
}
if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
thd->variables.sql_mode|= MODE_IGNORE_SPACE;
#ifdef HAVE_OPENSSL
DBUG_PRINT("info", ("client capabilities: %lu", thd->client_capabilities));
if (thd->client_capabilities & CLIENT_SSL)
{
/* Do the SSL layering. */
if (!ssl_acceptor_fd)
{
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
DBUG_PRINT("info", ("IO layer change in progress..."));
if (sslaccept(ssl_acceptor_fd, net->vio, net->read_timeout))
{
DBUG_PRINT("error", ("Failed to accept new SSL connection"));
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
DBUG_PRINT("info", ("Reading user information over SSL layer"));
if ((pkt_len= my_net_read(net)) == packet_error ||
pkt_len < NORMAL_HANDSHAKE_SIZE)
{
DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
pkt_len));
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
}
#endif /* HAVE_OPENSSL */
if (end >= (char*) net->read_pos+ pkt_len +2)
{
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
if (thd->client_capabilities & CLIENT_INTERACTIVE)
thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
opt_using_transactions)
net->return_status= &thd->server_status;
char *user= end;
char *passwd= strend(user)+1;
uint user_len= passwd - user - 1;
char *db= passwd;
char db_buff[NAME_LEN + 1]; // buffer to store db in utf8
char user_buff[USERNAME_LENGTH + 1]; // buffer to store user in utf8
uint dummy_errors;
/*
Old clients send null-terminated string as password; new clients send
the size (1 byte) + string (not null-terminated). Hence in case of empty
password both send '\0'.
This strlen() can't be easily deleted without changing protocol.
Cast *passwd to an unsigned char, so that it doesn't extend the sign for
*passwd > 127 and become 2**32-127+ after casting to uint.
*/
uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
(uchar)(*passwd++) : strlen(passwd);
db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
db + passwd_len + 1 : 0;
/* strlen() can't be easily deleted without changing protocol */
uint db_len= db ? strlen(db) : 0;
if (passwd + passwd_len + db_len > (char *)net->read_pos + pkt_len)
{
inc_host_errors(&thd->remote.sin_addr);
return ER_HANDSHAKE_ERROR;
}
/* Since 4.1 all database names are stored in utf8 */
if (db)
{
db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
system_charset_info,
db, db_len,
thd->charset(), &dummy_errors)]= 0;
db= db_buff;
}
user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1,
system_charset_info, user, user_len,
thd->charset(), &dummy_errors)]= '\0';
user= user_buff;
/* If username starts and ends in "'", chop them off */
if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
{
user[user_len-1]= 0;
user++;
user_len-= 2;
}
if (thd->main_security_ctx.user)
x_free(thd->main_security_ctx.user);
if (!(thd->main_security_ctx.user= my_strdup(user, MYF(0))))
return (ER_OUT_OF_RESOURCES);
return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
}
/*
Setup thread to be used with the current thread
SYNOPSIS
bool setup_connection_thread_globals()
thd Thread/connection handler
RETURN
0 ok
1 Error (out of memory)
In this case we will close the connection and increment status
*/
bool setup_connection_thread_globals(THD *thd)
{
if (thd->store_globals())
{
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
statistic_increment(aborted_connects,&LOCK_status);
thread_scheduler.end_thread(thd, 0);
return 1; // Error
}
return 0;
}
/*
Autenticate user, with error reporting
SYNOPSIS
login_connection()
thd Thread handler
NOTES
Connection is not closed in case of errors
RETURN
0 ok
1 error
*/
bool login_connection(THD *thd)
{
int error;
NET *net= &thd->net;
Security_context *sctx= thd->security_ctx;
DBUG_ENTER("login_connection");
DBUG_PRINT("info", ("handle_one_connection called by thread %lu",
thd->thread_id));
net->no_send_error= 0;
/* Use "connect_timeout" value during connection phase */
my_net_set_read_timeout(net, connect_timeout);
my_net_set_write_timeout(net, connect_timeout);
if ((error=check_connection(thd)))
{ // Wrong permissions
if (error > 0)
net_printf_error(thd, error, sctx->host_or_ip);
#ifdef __NT__
if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
my_sleep(1000); /* must wait after eof() */
#endif
statistic_increment(aborted_connects,&LOCK_status);
DBUG_RETURN(1);
}
/* Connect completed, set read/write timeouts back to default */
my_net_set_read_timeout(net, thd->variables.net_read_timeout);
my_net_set_write_timeout(net, thd->variables.net_write_timeout);
DBUG_RETURN(0);
}
/*
Close an established connection
NOTES
This mainly updates status variables
*/
void end_connection(THD *thd)
{
NET *net= &thd->net;
plugin_thdvar_cleanup(thd);
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
if (net->error && net->vio != 0 && net->report_error)
{
Security_context *sctx= thd->security_ctx;
if (!thd->killed && thd->variables.log_warnings > 1)
sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
thd->thread_id,(thd->db ? thd->db : "unconnected"),
sctx->user ? sctx->user : "unauthenticated",
sctx->host_or_ip,
(net->last_errno ? ER(net->last_errno) :
ER(ER_UNKNOWN_ERROR)));
net_send_error(thd, net->last_errno, NullS);
statistic_increment(aborted_threads,&LOCK_status);
}
else if (thd->killed)
statistic_increment(aborted_threads,&LOCK_status);
}
/*
Initialize THD to handle queries
*/
void prepare_new_connection_state(THD* thd)
{
Security_context *sctx= thd->security_ctx;
#ifdef __NETWARE__
netware_reg_user(sctx->ip, sctx->user, "MySQL");
#endif
if (thd->variables.max_join_size == HA_POS_ERROR)
thd->options |= OPTION_BIG_SELECTS;
if (thd->client_capabilities & CLIENT_COMPRESS)
thd->net.compress=1; // Use compression
thd->version= refresh_version;
thd->proc_info= 0;
thd->command= COM_SLEEP;
thd->set_time();
thd->init_for_queries();
if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL))
{
execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
if (thd->query_error)
{
thd->killed= THD::KILL_CONNECTION;
sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
thd->thread_id,(thd->db ? thd->db : "unconnected"),
sctx->user ? sctx->user : "unauthenticated",
sctx->host_or_ip, "init_connect command failed");
sql_print_warning("%s", thd->net.last_error);
}
thd->proc_info=0;
thd->set_time();
thd->init_for_queries();
}
}
/*
Thread handler for a connection
SYNOPSIS
handle_one_connection()
arg Connection object (THD)
IMPLEMENTATION
This function (normally) does the following:
- Initialize thread
- Initialize THD to be used with this thread
- Authenticate user
- Execute all queries sent on the connection
- Take connection down
- End thread / Handle next connection using thread from thread cache
*/
pthread_handler_t handle_one_connection(void *arg)
{
THD *thd= (THD*) arg;
uint launch_time =
(uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
if (thread_scheduler.init_new_connection_thread())
{
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
statistic_increment(aborted_connects,&LOCK_status);
thread_scheduler.end_thread(thd,0);
return 0;
}
if (launch_time >= slow_launch_time)
statistic_increment(slow_launch_threads,&LOCK_status);
/*
handle_one_connection() is normally the only way a thread would
start and would always be on the very high end of the stack ,
therefore, the thread stack always starts at the address of the
first local variable of handle_one_connection, which is thd. We
need to know the start of the stack so that we could check for
stack overruns.
*/
thd->thread_stack= (char*) &thd;
if (setup_connection_thread_globals(thd))
return 0;
for (;;)
{
NET *net= &thd->net;
if (login_connection(thd))
goto end_thread;
prepare_new_connection_state(thd);
while (!net->error && net->vio != 0 &&
!(thd->killed == THD::KILL_CONNECTION))
{
net->no_send_error= 0;
if (do_command(thd))
break;
}
end_connection(thd);
end_thread:
close_connection(thd, 0, 1);
if (thread_scheduler.end_thread(thd,1))
return 0; // Probably no-threads
/*
If end_thread() returns, we are either running with
thread-handler=no-threads or this thread has been schedule to
handle the next connection.
*/
thd= current_thd;
thd->thread_stack= (char*) &thd;
}
}
#endif /* EMBEDDED_LIBRARY */
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