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sql_authentication.cc
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/* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
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 02110-1301 USA */
#include "sql/auth/sql_authentication.h"
#include <string.h>
#include <fstream> // IWYU pragma: keep
#include <string> /* std::string */
#include <utility>
#include <vector> /* std::vector */
#include "crypt_genhash_impl.h" // generate_user_salt
#include "m_string.h"
#include "map_helpers.h"
#include "mutex_lock.h" // Mutex_lock
#include "my_byteorder.h"
#include "my_command.h"
#include "my_compiler.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_loglevel.h"
#include "my_psi_config.h"
#include "my_sys.h"
#include "my_time.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/psi/mysql_mutex.h"
#include "mysql/psi/psi_base.h"
#include "mysql/service_my_plugin_log.h"
#include "mysql/service_my_snprintf.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql/service_mysql_password_policy.h"
#include "mysql_com.h"
#include "mysql_time.h"
#include "mysqld_error.h"
#include "password.h" // my_make_scrambled_password
#include "pfs_thread_provider.h"
#include "prealloced_array.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/auth_common.h"
#include "sql/auth/auth_internal.h" // optimize_plugin_compare_by_pointer
#include "sql/auth/sql_auth_cache.h" // acl_cache
#include "sql/auth/sql_security_ctx.h"
#include "sql/conn_handler/connection_handler_manager.h" // Connection_handler_manager
#include "sql/current_thd.h" // current_thd
#include "sql/derror.h" // ER_THD
#include "sql/histograms/value_map.h"
#include "sql/hostname.h" // Host_errors, inc_host_errors
#include "sql/log.h" // query_logger
#include "sql/my_decimal.h"
#include "sql/mysqld.h" // global_system_variables
#include "sql/protocol.h"
#include "sql/protocol_classic.h"
#include "sql/psi_memory_key.h" // key_memory_MPVIO_EXT_auth_info
#include "sql/sql_class.h" // THD
#include "sql/sql_connect.h" // thd_init_client_charset
#include "sql/sql_const.h"
#include "sql/sql_db.h" // mysql_change_db
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_plugin.h" // my_plugin_lock_by_name
#include "sql/sql_servers.h"
#include "sql/sql_time.h" // Interval
#include "sql/system_variables.h"
#include "sql/tztime.h" // Time_zone
#include "sql_common.h" // mpvio_info
#include "sql_string.h"
#include "violite.h"
#if defined(HAVE_OPENSSL)
#ifndef HAVE_YASSL
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#else
#include <openssl/ssl.h>
#endif /* HAVE_YASSL */
#endif /* HAVE_OPENSSL */
/**
@file sql_authentication.cc
AUTHENTICATION CODE
including initial connect handshake, invoking appropriate plugins,
client-server plugin negotiation, COM_CHANGE_USER, and native
MySQL authentication plugins.
*/
/**
@page page_protocol_connection_phase Connection Phase
The Connection Phase performs these tasks:
- exchange the capabilities of client and server
- setup SSL communication channel if requested
- authenticate the client against the server
It starts with the client connect()ing to the server which may send a
ERR packet and finish the handshake or send a Initial Handshake Packet
which the client answers with a Handshake Response Packet. At this stage
client can request SSL connection, in which case an SSL communication
channel is established before client sends its authentication response.
@note In case the server sent a ERR packet as first packet it will happen
before the client and server negotiated any capabilities.
Therefore the ERR packet will not contain the SQL-state.
See also
@subpage page_caching_sha2_authentication_exchanges
*/
LEX_CSTRING native_password_plugin_name= {
C_STRING_WITH_LEN("mysql_native_password")
};
LEX_CSTRING sha256_password_plugin_name= {
C_STRING_WITH_LEN("sha256_password")
};
LEX_CSTRING validate_password_plugin_name= {
C_STRING_WITH_LEN("validate_password")
};
LEX_CSTRING default_auth_plugin_name;
plugin_ref native_password_plugin;
bool disconnect_on_expired_password= TRUE;
extern bool initialized;
/** Size of the header fields of an authentication packet. */
#define AUTH_PACKET_HEADER_SIZE_PROTO_41 32
#define AUTH_PACKET_HEADER_SIZE_PROTO_40 5
#if defined(HAVE_OPENSSL)
#define MAX_CIPHER_LENGTH 1024
#if !defined(HAVE_YASSL)
#define DEFAULT_SSL_CLIENT_CERT "client-cert.pem"
#define DEFAULT_SSL_CLIENT_KEY "client-key.pem"
#define MAX_CN_NAME_LENGTH 64
bool opt_auto_generate_certs= TRUE;
bool auth_rsa_auto_generate_rsa_keys= TRUE;
static bool do_auto_rsa_keys_generation();
char *auth_rsa_private_key_path;
char *auth_rsa_public_key_path;
Rsa_authentication_keys * g_sha256_rsa_keys= 0;
#endif /* HAVE_YASSL */
#endif /* HAVE_OPENSSL */
bool
Thd_charset_adapter::init_client_charset(uint cs_number)
{
if (thd_init_client_charset(thd, cs_number))
return true;
thd->update_charset();
return thd->is_error();
}
const CHARSET_INFO *
Thd_charset_adapter::charset()
{
return thd->charset();
}
#if defined(HAVE_OPENSSL)
/**
@brief Set key file path
@param [in] key Points to either m_private_key_path or
m_public_key_path.
@param [out] key_file_path Stores value of actual key file path.
*/
void
Rsa_authentication_keys::get_key_file_path(char *key, String *key_file_path)
{
/*
If a fully qualified path is entered use that, else assume the keys are
stored in the data directory.
*/
if (strchr(key, FN_LIBCHAR) != NULL
#ifdef _WIN32
|| strchr(key, FN_LIBCHAR2) != NULL
#endif
)
key_file_path->set_quick(key, strlen(key), system_charset_info);
else
{
key_file_path->append(mysql_real_data_home, strlen(mysql_real_data_home));
if ((*key_file_path)[key_file_path->length()] != FN_LIBCHAR)
key_file_path->append(FN_LIBCHAR);
key_file_path->append(key);
}
}
/**
@brief Read a key file and store its value in RSA structure
@param [out] key_ptr Address of pointer to RSA. This is set to
point to a non null value if key is correctly
read.
@param [in] is_priv_key Whether we are reading private key or public
key.
@param [out] key_text_buffer To store key file content of public key.
@return Error status
@retval false Success : Either both keys are read or none
are.
@retval true Failure : An appropriate error is raised.
*/
bool
Rsa_authentication_keys::read_key_file(RSA **key_ptr,
bool is_priv_key,
char **key_text_buffer)
{
String key_file_path;
char *key;
const char *key_type;
FILE *key_file= NULL;
key= is_priv_key ? *m_private_key_path : *m_public_key_path;
key_type= is_priv_key ? "private" : "public";
*key_ptr= NULL;
get_key_file_path(key, &key_file_path);
/*
Check for existance of private key/public key file.
*/
if ((key_file= fopen(key_file_path.c_ptr(), "rb")) == NULL)
{
LogErr(INFORMATION_LEVEL, ER_AUTH_RSA_CANT_FIND, key_type,
key_file_path.c_ptr());
}
else
{
*key_ptr= is_priv_key ? PEM_read_RSAPrivateKey(key_file, 0, 0, 0) :
PEM_read_RSA_PUBKEY(key_file, 0, 0, 0);
if (!(*key_ptr))
{
char error_buf[MYSQL_ERRMSG_SIZE];
ERR_error_string_n(ERR_get_error(), error_buf, MYSQL_ERRMSG_SIZE);
LogErr(ERROR_LEVEL, ER_AUTH_RSA_CANT_PARSE,
key_type, key_file_path.c_ptr(), error_buf);
/*
Call ERR_clear_error() just in case there are more than 1 entry in the
OpenSSL thread's error queue.
*/
#ifndef HAVE_YASSL
ERR_clear_error();
#endif
return true;
}
/* For public key, read key file content into a char buffer. */
bool read_error= false;
if (!is_priv_key)
{
int filesize;
fseek(key_file, 0, SEEK_END);
filesize= ftell(key_file);
fseek(key_file, 0, SEEK_SET);
*key_text_buffer= new char[filesize+1];
int items_read= fread(*key_text_buffer, filesize, 1, key_file);
read_error= items_read != 1;
if (read_error)
{
char errbuf[MYSQL_ERRMSG_SIZE];
LogErr(ERROR_LEVEL, ER_AUTH_RSA_CANT_READ,
my_strerror(errbuf, MYSQL_ERRMSG_SIZE, my_errno()));
}
(*key_text_buffer)[filesize]= '\0';
}
fclose(key_file);
return read_error;
}
return false;
}
void
Rsa_authentication_keys::free_memory()
{
if (m_private_key)
RSA_free(m_private_key);
if (m_public_key)
{
RSA_free(m_public_key);
m_cipher_len= 0;
}
if (m_pem_public_key)
delete [] m_pem_public_key;
}
void *
Rsa_authentication_keys::allocate_pem_buffer(size_t buffer_len)
{
m_pem_public_key= new char[buffer_len];
return m_pem_public_key;
}
int
Rsa_authentication_keys::get_cipher_length()
{
return (m_cipher_len= RSA_size(m_public_key));
}
/**
@brief Read RSA private key and public key from file and store them
in m_private_key and m_public_key. Also, read public key in
text format and store it in m_pem_public_key.
@return Error status
@retval false Success : Either both keys are read or none are.
@retval true Failure : An appropriate error is raised.
*/
bool
Rsa_authentication_keys::read_rsa_keys()
{
RSA *rsa_private_key_ptr= NULL;
RSA *rsa_public_key_ptr= NULL;
char *pub_key_buff= NULL;
if ((strlen(*m_private_key_path) == 0) &&
(strlen(*m_public_key_path) == 0))
{
LogErr(INFORMATION_LEVEL, ER_AUTH_RSA_FILES_NOT_FOUND);
return false;
}
/*
Read private key in RSA format.
*/
if (read_key_file(&rsa_private_key_ptr, true, NULL))
return true;
/*
Read public key in RSA format.
*/
if (read_key_file(&rsa_public_key_ptr, false, &pub_key_buff))
{
if (rsa_private_key_ptr)
RSA_free(rsa_private_key_ptr);
return true;
}
/*
If both key files are read successfully then assign values to following
members of the class
1. m_pem_public_key
2. m_private_key
3. m_public_key
Else clean up.
*/
if (rsa_private_key_ptr && rsa_public_key_ptr)
{
size_t buff_len= strlen(pub_key_buff);
char *pem_file_buffer= (char *)allocate_pem_buffer(buff_len + 1);
strncpy(pem_file_buffer, pub_key_buff, buff_len);
pem_file_buffer[buff_len]= '\0';
m_private_key= rsa_private_key_ptr;
m_public_key= rsa_public_key_ptr;
delete [] pub_key_buff;
}
else
{
if (rsa_private_key_ptr)
RSA_free(rsa_private_key_ptr);
if (rsa_public_key_ptr)
{
delete [] pub_key_buff;
RSA_free(rsa_public_key_ptr);
}
}
return false;
}
#endif /* HAVE_OPENSSL */
/**
Initialize default authentication plugin based on command line options or
configuration file settings.
@param plugin_name Name of the plugin
@param plugin_name_length Length of the string
*/
int set_default_auth_plugin(char *plugin_name, size_t plugin_name_length)
{
default_auth_plugin_name.str= plugin_name;
default_auth_plugin_name.length= plugin_name_length;
optimize_plugin_compare_by_pointer(&default_auth_plugin_name);
#if defined(HAVE_OPENSSL)
if (default_auth_plugin_name.str == sha256_password_plugin_name.str)
{
/*
Adjust default password algorithm to fit the default authentication
method.
*/
global_system_variables.old_passwords= 2;
}
else
#endif /* HAVE_OPENSSL */
if (default_auth_plugin_name.str != native_password_plugin_name.str &&
default_auth_plugin_name.str != caching_sha2_password_plugin_name.str)
return 1;
return 0;
}
void optimize_plugin_compare_by_pointer(LEX_CSTRING *plugin_name)
{
#if defined(HAVE_OPENSSL)
if (my_strcasecmp(system_charset_info, sha256_password_plugin_name.str,
plugin_name->str) == 0)
{
plugin_name->str= sha256_password_plugin_name.str;
plugin_name->length= sha256_password_plugin_name.length;
}
else if (my_strcasecmp(system_charset_info,
caching_sha2_password_plugin_name.str,
plugin_name->str) == 0)
{
plugin_name->str= caching_sha2_password_plugin_name.str;
plugin_name->length= caching_sha2_password_plugin_name.length;
}
else
#endif
if (my_strcasecmp(system_charset_info, native_password_plugin_name.str,
plugin_name->str) == 0)
{
plugin_name->str= native_password_plugin_name.str;
plugin_name->length= native_password_plugin_name.length;
}
}
std::vector<std::string> builtin_auth_plugins=
{"mysql_native_password", "sha256_password" };
bool auth_plugin_is_built_in(const char *plugin_name)
{
return (plugin_name == native_password_plugin_name.str
#if defined(HAVE_OPENSSL)
|| plugin_name == sha256_password_plugin_name.str
#endif
|| plugin_name == caching_sha2_password_plugin_name.str
);
}
/**
Only the plugins that are known to use the mysql.user table
to store their passwords support password expiration atm.
TODO: create a service and extend the plugin API to support
password expiration for external plugins.
@retval false expiration not supported
@retval true expiration supported
*/
bool auth_plugin_supports_expiration(const char *plugin_name)
{
if (!plugin_name || !*plugin_name)
return false;
return (plugin_name == native_password_plugin_name.str
|| plugin_name == caching_sha2_password_plugin_name.str
#if defined(HAVE_OPENSSL)
|| plugin_name == sha256_password_plugin_name.str
#endif
);
}
/* few defines to have less ifdef's in the code below */
#ifndef HAVE_OPENSSL
#define ssl_acceptor_fd 0
#define sslaccept(A,B,C) 1
#endif /* HAVE_OPENSSL */
/**
a helper function to report an access denied error in all the proper places
*/
static void login_failed_error(THD *thd, MPVIO_EXT *mpvio, int passwd_used)
{
if (passwd_used == 2)
{
my_error(ER_ACCESS_DENIED_NO_PASSWORD_ERROR, MYF(0),
mpvio->auth_info.user_name,
mpvio->auth_info.host_or_ip);
query_logger.general_log_print(thd, COM_CONNECT,
ER_DEFAULT(ER_ACCESS_DENIED_NO_PASSWORD_ERROR),
mpvio->auth_info.user_name,
mpvio->auth_info.host_or_ip);
/*
Log access denied messages to the error log when log_error_verbosity = 3
so that the overhead of the general query log is not required to track
failed connections.
*/
LogErr(INFORMATION_LEVEL, ER_ACCESS_DENIED_NO_PASSWORD_ERROR,
mpvio->auth_info.user_name,
mpvio->auth_info.host_or_ip);
}
else
{
my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
mpvio->auth_info.user_name,
mpvio->auth_info.host_or_ip,
passwd_used ? ER_THD(thd, ER_YES) : ER_THD(thd, ER_NO));
query_logger.general_log_print(thd, COM_CONNECT,
ER_DEFAULT(ER_ACCESS_DENIED_ERROR),
mpvio->auth_info.user_name,
mpvio->auth_info.host_or_ip,
passwd_used ? ER_DEFAULT(ER_YES) : ER_DEFAULT(ER_NO));
/*
Log access denied messages to the error log when log_error_verbosity = 3
so that the overhead of the general query log is not required to track
failed connections.
*/
LogErr(INFORMATION_LEVEL, ER_ACCESS_DENIED_ERROR,
mpvio->auth_info.user_name,
mpvio->auth_info.host_or_ip,
passwd_used ? ER_DEFAULT(ER_YES) : ER_DEFAULT(ER_NO));
}
}
/**
sends a server handshake initialization packet, the very first packet
after the connection was established
Packet format:
Bytes Content
----- ----
1 protocol version (always 10)
n server version string, \0-terminated
4 thread id
8 first 8 bytes of the plugin provided data (scramble)
1 \0 byte, terminating the first part of a scramble
2 server capabilities (two lower bytes)
1 server character set
2 server status
2 server capabilities (two upper bytes)
1 length of the scramble
10 reserved, always 0
n rest of the plugin provided data (at least 12 bytes)
1 \0 byte, terminating the second part of a scramble
@retval 0 ok
@retval 1 error
*/
static bool send_server_handshake_packet(MPVIO_EXT *mpvio,
const char *data, uint data_len)
{
DBUG_ASSERT(mpvio->status == MPVIO_EXT::FAILURE);
DBUG_ASSERT(data_len <= 255);
Protocol_classic *protocol= mpvio->protocol;
char *buff= (char *) my_alloca(1 + SERVER_VERSION_LENGTH + data_len + 64);
char scramble_buf[SCRAMBLE_LENGTH];
char *end= buff;
DBUG_ENTER("send_server_handshake_packet");
*end++= protocol_version;
protocol->set_client_capabilities(CLIENT_BASIC_FLAGS);
if (opt_using_transactions)
protocol->add_client_capability(CLIENT_TRANSACTIONS);
protocol->add_client_capability(CAN_CLIENT_COMPRESS);
if (ssl_acceptor_fd)
{
protocol->add_client_capability(CLIENT_SSL);
protocol->add_client_capability(CLIENT_SSL_VERIFY_SERVER_CERT);
}
if (data_len)
{
mpvio->cached_server_packet.pkt= (char*) memdup_root(mpvio->mem_root,
data, data_len);
mpvio->cached_server_packet.pkt_len= data_len;
}
if (data_len < SCRAMBLE_LENGTH)
{
if (data_len)
{
/*
the first packet *must* have at least 20 bytes of a scramble.
if a plugin provided less, we pad it to 20 with zeros
*/
memcpy(scramble_buf, data, data_len);
memset(scramble_buf + data_len, 0, SCRAMBLE_LENGTH - data_len);
data= scramble_buf;
}
else
{
/*
if the default plugin does not provide the data for the scramble at
all, we generate a scramble internally anyway, just in case the
user account (that will be known only later) uses a
native_password_plugin (which needs a scramble). If we don't send a
scramble now - wasting 20 bytes in the packet -
native_password_plugin will have to send it in a separate packet,
adding one more round trip.
*/
generate_user_salt(mpvio->scramble, SCRAMBLE_LENGTH + 1);
data= mpvio->scramble;
}
data_len= SCRAMBLE_LENGTH;
}
end= my_stpnmov(end, server_version, SERVER_VERSION_LENGTH) + 1;
DBUG_ASSERT(sizeof(my_thread_id) == 4);
int4store((uchar*) end, mpvio->thread_id);
end+= 4;
/*
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= (char*) memcpy(end, data, AUTH_PLUGIN_DATA_PART_1_LENGTH);
end+= AUTH_PLUGIN_DATA_PART_1_LENGTH;
*end++= 0;
int2store(end, static_cast<uint16>(protocol->get_client_capabilities()));
/* write server characteristics: up to 16 bytes allowed */
end[2]= (char) default_charset_info->number;
int2store(end + 3, mpvio->server_status[0]);
int2store(end + 5, protocol->get_client_capabilities() >> 16);
end[7]= data_len;
DBUG_EXECUTE_IF("poison_srv_handshake_scramble_len", end[7]= -100;);
memset(end + 8, 0, 10);
end+= 18;
/* write scramble tail */
end= (char*) memcpy(end, data + AUTH_PLUGIN_DATA_PART_1_LENGTH,
data_len - AUTH_PLUGIN_DATA_PART_1_LENGTH);
end+= data_len - AUTH_PLUGIN_DATA_PART_1_LENGTH;
end= strmake(end, plugin_name(mpvio->plugin)->str,
plugin_name(mpvio->plugin)->length);
int res= protocol->write((uchar*) buff, (size_t) (end - buff + 1)) ||
protocol->flush();
DBUG_RETURN (res);
}
/**
sends a "change plugin" packet, requesting a client to restart authentication
using a different authentication plugin
Packet format:
Bytes Content
----- ----
1 byte with the value 254
n client plugin to use, \0-terminated
n plugin provided data
@retval 0 ok
@retval 1 error
*/
static bool send_plugin_request_packet(MPVIO_EXT *mpvio,
const uchar *data, uint data_len)
{
DBUG_ASSERT(mpvio->packets_written == 1);
DBUG_ASSERT(mpvio->packets_read == 1);
static uchar switch_plugin_request_buf[]= { 254 };
DBUG_ENTER("send_plugin_request_packet");
mpvio->status= MPVIO_EXT::FAILURE; // the status is no longer RESTART
const char *client_auth_plugin=
((st_mysql_auth *) (plugin_decl(mpvio->plugin)->info))->client_auth_plugin;
DBUG_ASSERT(client_auth_plugin);
/*
If we're dealing with an older client we can't just send a change plugin
packet to re-initiate the authentication handshake, because the client
won't understand it. The good thing is that we don't need to : the old client
expects us to just check the user credentials here, which we can do by just reading
the cached data that are placed there by parse_com_change_user_packet()
In this case we just do nothing and behave as if normal authentication
should continue.
*/
if (!(mpvio->protocol->has_client_capability(CLIENT_PLUGIN_AUTH)))
{
DBUG_PRINT("info", ("old client sent a COM_CHANGE_USER"));
DBUG_ASSERT(mpvio->cached_client_reply.pkt);
/* get the status back so the read can process the cached result */
mpvio->status= MPVIO_EXT::RESTART;
DBUG_RETURN(0);
}
DBUG_PRINT("info", ("requesting client to use the %s plugin",
client_auth_plugin));
DBUG_RETURN(net_write_command(mpvio->protocol->get_net(),
switch_plugin_request_buf[0],
(uchar*) client_auth_plugin,
strlen(client_auth_plugin) + 1,
(uchar*) data, data_len));
}
/* Return true if there is no users that can match the given host */
bool acl_check_host(THD *thd, const char *host, const char *ip)
{
Acl_cache_lock_guard acl_cache_lock(thd, Acl_cache_lock_mode::READ_MODE);
if (!acl_cache_lock.lock(false))
return 1;
if (allow_all_hosts)
return 0;
if ((host && acl_check_hosts->count(host) != 0) ||
(ip && acl_check_hosts->count(ip) != 0))
return 0; // Found host
for (ACL_HOST_AND_IP *acl= acl_wild_hosts->begin();
acl != acl_wild_hosts->end(); ++acl)
{
if (acl->compare_hostname(host, ip))
return 0; // Host ok
}
if (ip != NULL)
{
/* Increment HOST_CACHE.COUNT_HOST_ACL_ERRORS. */
Host_errors errors;
errors.m_host_acl= 1;
inc_host_errors(ip, &errors);
}
return 1; // Host is not allowed
}
/**
When authentication is attempted using an unknown username a dummy user
account with no authentication capabilites is assigned to the connection.
This is done increase the cost of enumerating user accounts based on
authentication protocol.
*/
static ACL_USER * decoy_user(const LEX_STRING &username,
const LEX_STRING &hostname,
MEM_ROOT *mem)
{
ACL_USER *user= (ACL_USER *) alloc_root(mem, sizeof(ACL_USER));
user->can_authenticate= false;
user->user= strdup_root(mem, username.str);
user->user[username.length]= '\0';
user->host.update_hostname(strdup_root(mem, hostname.str));
user->auth_string= empty_lex_str;
user->ssl_cipher= empty_c_string;
user->x509_issuer= empty_c_string;
user->x509_subject= empty_c_string;
user->salt_len= 0;
user->password_last_changed.time_type= MYSQL_TIMESTAMP_ERROR;
user->password_lifetime= 0;
user->use_default_password_lifetime= true;
user->account_locked= false;
user->use_default_password_reuse_interval= true;
user->password_reuse_interval= 0;
user->use_default_password_history= true;
user->password_history_length= 0;
/*
For now the common default account is used. Improvements might involve
mapping a consistent hash of a username to a range of plugins.
*/
user->plugin= default_auth_plugin_name;
return user;
}
/**
Finds acl entry in user database for authentication purposes.
Finds a user and copies it into mpvio. Reports an authentication
failure if a user is not found.
@note find_acl_user is not the same, because it doesn't take into
account the case when user is not empty, but acl_user->user is empty
@retval 0 found
@retval 1 not found
*/
static bool find_mpvio_user(THD *thd, MPVIO_EXT *mpvio)
{
DBUG_ENTER("find_mpvio_user");
DBUG_PRINT("info", ("entry: %s", mpvio->auth_info.user_name));
DBUG_ASSERT(mpvio->acl_user == 0);
Acl_cache_lock_guard acl_cache_lock(thd, Acl_cache_lock_mode::READ_MODE);
if (!acl_cache_lock.lock(false))
DBUG_RETURN(true);
for (ACL_USER *acl_user_tmp= acl_users->begin();
acl_user_tmp != acl_users->end(); ++acl_user_tmp)
{
if ((!acl_user_tmp->user ||
!strcmp(mpvio->auth_info.user_name, acl_user_tmp->user)) &&
acl_user_tmp->host.compare_hostname(mpvio->host, mpvio->ip))
{
mpvio->acl_user= acl_user_tmp->copy(mpvio->mem_root);
/*
When setting mpvio->acl_user_plugin we can save memory allocation if
this is a built in plugin.
*/
if (auth_plugin_is_built_in(acl_user_tmp->plugin.str))
mpvio->acl_user_plugin= mpvio->acl_user->plugin;
else
make_lex_string_root(mpvio->mem_root,
&mpvio->acl_user_plugin,
acl_user_tmp->plugin.str,
acl_user_tmp->plugin.length, 0);
break;
}
}
acl_cache_lock.unlock();
if (!mpvio->acl_user)
{
/*
Pretend the user exists; let the plugin decide how to handle
bad credentials.
*/
LEX_STRING usr= { mpvio->auth_info.user_name,
mpvio->auth_info.user_name_length };
LEX_STRING hst= { mpvio->host ? mpvio->host : mpvio->ip,
mpvio->host ? strlen(mpvio->host) : strlen(mpvio->ip) };
mpvio->acl_user= decoy_user(usr, hst, mpvio->mem_root);
mpvio->acl_user_plugin= mpvio->acl_user->plugin;
}
if (my_strcasecmp(system_charset_info, mpvio->acl_user->plugin.str,
native_password_plugin_name.str) != 0 &&
!(mpvio->protocol->has_client_capability(CLIENT_PLUGIN_AUTH)))
{
/* user account requires non-default plugin and the client is too old */
DBUG_ASSERT(my_strcasecmp(system_charset_info, mpvio->acl_user->plugin.str,
native_password_plugin_name.str));
my_error(ER_NOT_SUPPORTED_AUTH_MODE, MYF(0));
query_logger.general_log_print(thd, COM_CONNECT,
ER_DEFAULT(ER_NOT_SUPPORTED_AUTH_MODE));
DBUG_RETURN (1);
}
mpvio->auth_info.auth_string= mpvio->acl_user->auth_string.str;
mpvio->auth_info.auth_string_length=
(unsigned long) mpvio->acl_user->auth_string.length;
strmake(mpvio->auth_info.authenticated_as, mpvio->acl_user->user ?
mpvio->acl_user->user : "", USERNAME_LENGTH);
DBUG_PRINT("info", ("exit: user=%s, auth_string=%s, authenticated as=%s"
", plugin=%s",
mpvio->auth_info.user_name,
mpvio->auth_info.auth_string,
mpvio->auth_info.authenticated_as,
mpvio->acl_user->plugin.str));
DBUG_RETURN(0);
}
static bool
read_client_connect_attrs(char **ptr, size_t *max_bytes_available,
MPVIO_EXT *mpvio)
{
size_t length, length_length;
char *ptr_save;
/* not enough bytes to hold the length */
if (*max_bytes_available < 1)
return true;
/* read the length */
ptr_save= *ptr;
length= static_cast<size_t>(net_field_length_ll((uchar **) ptr));
length_length= *ptr - ptr_save;
if (*max_bytes_available < length_length)
return true;
*max_bytes_available-= length_length;
/* length says there're more data than can fit into the packet */
if (length > *max_bytes_available)
return true;
/* impose an artificial length limit of 64k */
if (length > 65535)
return true;
#ifdef HAVE_PSI_THREAD_INTERFACE
MYSQL_SERVER_AUTH_INFO *auth_info= &mpvio->auth_info;
int bytes_lost;
if ((bytes_lost= PSI_THREAD_CALL(set_thread_connect_attrs)(*ptr, length, mpvio->charset_adapter->charset())))
LogErr(WARNING_LEVEL, ER_CONN_ATTR_TRUNCATED,
(unsigned long) length, (int) bytes_lost,
(unsigned long long) mpvio->thread_id,
(auth_info->user_name == NULL)
? ""
: auth_info->user_name,
auth_info->host_or_ip,
auth_info->authenticated_as,
mpvio->can_authenticate() ? "yes" : "no");
#endif /* HAVE_PSI_THREAD_INTERFACE */
return false;
}
static bool acl_check_ssl(THD *thd, const ACL_USER *acl_user)
{
#if defined(HAVE_OPENSSL)
Vio *vio= thd->get_protocol_classic()->get_vio();
SSL *ssl= thd->get_protocol()->get_ssl();
X509 *cert;
#endif /* HAVE_OPENSSL */
/*
At this point we know that user is allowed to connect
from given host by given username/password pair. Now
we check if SSL is required, if user is using SSL and
if X509 certificate attributes are OK
*/
switch (acl_user->ssl_type) {
case SSL_TYPE_NOT_SPECIFIED: // Impossible
case SSL_TYPE_NONE: // SSL is not required
return 0;
#if defined(HAVE_OPENSSL)
case SSL_TYPE_ANY: // Any kind of SSL is ok
return vio_type(vio) != VIO_TYPE_SSL;
case SSL_TYPE_X509: /* Client should have any valid certificate. */
/*
Connections with non-valid certificates are dropped already
in sslaccept() anyway, so we do not check validity here.
We need to check for absence of SSL because without SSL
we should reject connection.
*/
if (vio_type(vio) == VIO_TYPE_SSL &&
SSL_get_verify_result(ssl) == X509_V_OK &&
(cert= SSL_get_peer_certificate(ssl)))
{
X509_free(cert);
return 0;
}
return 1;
case SSL_TYPE_SPECIFIED: /* Client should have specified attrib */
/* If a cipher name is specified, we compare it to actual cipher in use. */
if (vio_type(vio) != VIO_TYPE_SSL ||
SSL_get_verify_result(ssl) != X509_V_OK)
return 1;
if (acl_user->ssl_cipher)
{
DBUG_PRINT("info", ("comparing ciphers: '%s' and '%s'",
acl_user->ssl_cipher, SSL_get_cipher(ssl)));
if (strcmp(acl_user->ssl_cipher, SSL_get_cipher(ssl)))