sha2_password.cc File Reference

#include <string.h>
#include <sys/types.h>
#include <algorithm>
#include <iomanip>
#include <iostream>
#include <string>
#include <unordered_map>
#include <utility>
#include "crypt_genhash_impl.h"
#include "lex_string.h"
#include "m_string.h"
#include "my_compiler.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_macros.h"
#include "mysql/components/my_service.h"
#include "mysql/components/services/bits/psi_bits.h"
#include "mysql/components/services/bits/psi_rwlock_bits.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/mysql_lex_string.h"
#include "mysql/plugin.h"
#include "mysql/plugin_audit.h"
#include "mysql/plugin_auth.h"
#include "mysql/plugin_auth_common.h"
#include "mysql/psi/mysql_rwlock.h"
#include "mysql/service_my_plugin_log.h"
#include "mysql/service_mysql_password_policy.h"
#include "mysql_com.h"
#include "mysqld_error.h"
#include "rwlock_scoped_lock.h"
#include "sql/auth/auth_common.h"
#include "sql/auth/i_sha2_password.h"
#include "sql/auth/i_sha2_password_common.h"
#include "sql/auth/sql_auth_cache.h"
#include "sql/auth/sql_authentication.h"
#include "sql/debug_sync.h"
#include "sql/protocol_classic.h"
#include "sql/sql_class.h"
#include "sql/sql_const.h"
#include "violite.h"
#include <openssl/ssl.h>

Classes
struct	caching_sha2_auth_handler
	st_mysql_auth for caching_sha2_password plugin More...

Namespaces
namespace	sha2_password

Macros
#define	LOG_COMPONENT_TAG   "caching_sha2_password"

Functions
static int	my_vio_is_secure (MYSQL_PLUGIN_VIO *vio)
	Interface for querying the MYSQL_PUBLIC_VIO about encryption state. More...
static void	auth_save_scramble (MYSQL_PLUGIN_VIO *vio, const char *scramble)
	Save the scramble in mpvio for future re-use. More...
static void	make_hash_key (const char *username, const char *hostname, std::string &key)
	Make hash key. More...
static int	caching_sha2_password_authenticate (MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
	Authentication routine for caching_sha2_password. More...
static int	caching_sha2_password_generate (char *outbuf, unsigned int *buflen, const char *inbuf, unsigned int inbuflen)
	Generate hash for caching_sha2_password plugin. More...
static int	caching_sha2_password_validate (char *const inbuf, unsigned int buflen)
	Validate a hash against caching_sha2_password plugin's hash format. More...
static int	caching_sha2_password_salt (const char *password, unsigned int password_len, unsigned char *salt, unsigned char *salt_len)
	NoOp - Salt generation for cachhing_sha2_password plugin. More...
static int	caching_sha2_authentication_init (MYSQL_PLUGIN plugin_ref)
static int	caching_sha2_authentication_deinit (void *arg)
	Deinitialize caching_sha2_password plugin. More...
static int	compare_caching_sha2_password_with_hash (const char *hash, unsigned long hash_length, const char *cleartext, unsigned long cleartext_length, int *is_error)
	Compare a clear text password with a stored hash. More...
static int	show_caching_sha2_password_rsa_public_key (MYSQL_THD thd, SHOW_VAR *var, char *buff)
	Function to display value for status variable : Caching_sha2_password_rsa_public_key. More...
static	MYSQL_SYSVAR_STR (private_key_path, caching_sha2_rsa_private_key_path, PLUGIN_VAR_READONLY|PLUGIN_VAR_NOPERSIST, "A fully qualified path to the private RSA key used for authentication.", nullptr, nullptr, AUTH_DEFAULT_RSA_PRIVATE_KEY)
static	MYSQL_SYSVAR_STR (public_key_path, caching_sha2_rsa_public_key_path, PLUGIN_VAR_READONLY|PLUGIN_VAR_NOPERSIST, "A fully qualified path to the public RSA key used for authentication.", nullptr, nullptr, AUTH_DEFAULT_RSA_PUBLIC_KEY)
static	MYSQL_SYSVAR_BOOL (auto_generate_rsa_keys, caching_sha2_auto_generate_rsa_keys, PLUGIN_VAR_READONLY|PLUGIN_VAR_OPCMDARG|PLUGIN_VAR_NOPERSIST, "Auto generate RSA keys at server startup if corresponding " "system variables are not specified and key files are not present " "at the default location.", nullptr, nullptr, true)
static	MYSQL_SYSVAR_INT (digest_rounds, caching_sha2_digest_rounds, PLUGIN_VAR_READONLY, "Number of SHA2 rounds to be done when storing a password hash onto disk.", nullptr, nullptr, sha2_password::DEFAULT_STORED_DIGEST_ROUNDS, sha2_password::MIN_STORED_DIGEST_ROUNDS, sha2_password::MAX_STORED_DIGEST_ROUNDS, 1)
static int	sha2_cache_cleaner_notify (MYSQL_THD, mysql_event_class_t event_class, const void *event)
	Handle an authentication audit event. More...
static int	caching_sha2_cache_cleaner_init (MYSQL_PLUGIN plugin_info)
	Init function for sha2_cache_cleaner. More...
static int	caching_sha2_cache_cleaner_deinit (void *arg)
	Deinit function for sha2_cache_cleaner. More...
	mysql_declare_plugin (caching_sha2_password)

Variables
char *	caching_sha2_rsa_private_key_path
char *	caching_sha2_rsa_public_key_path
bool	caching_sha2_auto_generate_rsa_keys = true
Rsa_authentication_keys *	g_caching_sha2_rsa_keys = nullptr
int	caching_sha2_digest_rounds = 0
static const char *	sha2_password::category = "sha2_auth"
static PSI_rwlock_key	sha2_password::key_m_cache_lock
static PSI_rwlock_info	sha2_password::all_rwlocks []
const int	MAX_CIPHER_LENGTH = 1024
	Length of encrypted packet. More...
sha2_password::Caching_sha2_password *	g_caching_sha2_password = nullptr
	Caching_sha2_password handle. More...
static MYSQL_PLUGIN	caching_sha2_auth_plugin_ref
	caching_sha2_password plugin handle - Mostly used for logging More...
static char	request_public_key = '\2'
static char	fast_auth_success = '\3'
static char	perform_full_authentication = '\4'
static SYS_VAR *	caching_sha2_password_sysvars []
	Array of system variables. More...
static SHOW_VAR	caching_sha2_password_status_variables []
	Array of status variables. More...
struct st_mysql_audit	sha2_cache_cleaner
	st_mysql_audit for sha2_cache_cleaner plugin More...

Macro Definition Documentation

LOG_COMPONENT_TAG

#define LOG_COMPONENT_TAG   "caching_sha2_password"

Function Documentation

auth_save_scramble()

static void auth_save_scramble ( MYSQL_PLUGIN_VIO *  vio, const char *  scramble  )

inlinestatic

Save the scramble in mpvio for future re-use.

It is useful when we need to pass the scramble to another plugin. Especially in case when old 5.1 client with no CLIENT_PLUGIN_AUTH capability tries to connect to server with default-authentication-plugin set to caching_sha2_password

Parameters

vio	Virtual Input-Output interface
scramble	Scramble to be saved

caching_sha2_authentication_deinit()

static int caching_sha2_authentication_deinit ( void *  arg )

static

Deinitialize caching_sha2_password plugin.

Parameters

[in]

arg

Unused

Returns

Always returns success

caching_sha2_authentication_init()

static int caching_sha2_authentication_init ( MYSQL_PLUGIN  plugin_ref )

static

caching_sha2_cache_cleaner_deinit()

static int caching_sha2_cache_cleaner_deinit ( void *  arg )

static

Deinit function for sha2_cache_cleaner.

caching_sha2_cache_cleaner_init()

static int caching_sha2_cache_cleaner_init ( MYSQL_PLUGIN  plugin_info )

static

Init function for sha2_cache_cleaner.

caching_sha2_password_authenticate()

static int caching_sha2_password_authenticate ( MYSQL_PLUGIN_VIO *  vio, MYSQL_SERVER_AUTH_INFO *  info  )

static

Authentication routine for caching_sha2_password.

Parameters

[in]	vio	Virtual I/O interface
[in]	info	Connection information

Refer to Caching_sha2_password information for server-client communication in various cases

Returns

status of authentication process

Return values

CR_OK	Successful authentication
CR_ERROR	Authentication failure

caching_sha2_password_generate()

static int caching_sha2_password_generate ( char *  outbuf, unsigned int *  buflen, const char *  inbuf, unsigned int  inbuflen  )

static

Generate hash for caching_sha2_password plugin.

Parameters

[out]	outbuf	Hash output buffer
[out]	buflen	Length of hash in output buffer
[in]	inbuf	Plaintext password
[in]	inbuflen	Input password length

Note

outbuf must be larger than MAX_FIELD_WIDTH. It is assumed the caller asserts this.

Returns

status of hash generation

Return values

0	Successful hash generation
1	Error generating hash. Don't reply on outbuf/buflen

caching_sha2_password_salt()

static int caching_sha2_password_salt ( const char *  password, unsigned int  password_len, unsigned char *  salt, unsigned char *  salt_len  )

static

NoOp - Salt generation for cachhing_sha2_password plugin.

Parameters

[in]	password	Unused
[in]	password_len	Unused
[out]	salt	Unused
[out]	salt_len	Length of the salt buffer

Returns

Always returns success (0)

caching_sha2_password_validate()

static int caching_sha2_password_validate ( char *const  inbuf, unsigned int  buflen  )

static

Validate a hash against caching_sha2_password plugin's hash format.

Parameters

[in]	inbuf	Hash to be validated
[in]	buflen	Length of the hash

Returns

status of hash validation

Return values

0	Hash is according to caching_sha2_password's expected format
1	Hash does not match caching_sha2_password's requirement

compare_caching_sha2_password_with_hash()

static int compare_caching_sha2_password_with_hash ( const char *  hash, unsigned long  hash_length, const char *  cleartext, unsigned long  cleartext_length, int *  is_error  )

static

Compare a clear text password with a stored hash.

Check if stored hash is produced using a clear text password. To do that, first extra scrmable from the hash. Then calculate a new hash using extracted scramble and the supplied password. And finally compare the two hashes.

• hash pointer to the hashed data
• hash_length length of the hashed data
• cleartext pointer to the clear text password
• cleartext_length length of the cleat text password
• [out] is_error non-zero in case of error extracting the salt

  Return values

  0	the hash was created with that password
  non-zero	the hash was created with a different password

make_hash_key()

static void make_hash_key ( const char *  username, const char *  hostname, std::string &  key  )

static

Make hash key.

Parameters

[in]	username	User part of the key
[in]	hostname	Host part of the key
[out]	key	Generated hash key

my_vio_is_secure()

static int my_vio_is_secure ( MYSQL_PLUGIN_VIO *  vio )

static

Interface for querying the MYSQL_PUBLIC_VIO about encryption state.

mysql_declare_plugin()

mysql_declare_plugin

(

caching_sha2_password

)

MYSQL_SYSVAR_BOOL()

static MYSQL_SYSVAR_BOOL ( auto_generate_rsa_keys  , caching_sha2_auto_generate_rsa_keys  , PLUGIN_VAR_READONLY|PLUGIN_VAR_OPCMDARG|  PLUGIN_VAR_NOPERSIST, "Auto generate RSA keys at server startup if corresponding " "system variables are not specified and key files are not present " "at the default location."  , nullptr  , nullptr  , true    )

static

MYSQL_SYSVAR_INT()

static MYSQL_SYSVAR_INT ( digest_rounds  , caching_sha2_digest_rounds  , PLUGIN_VAR_READONLY  , "Number of SHA2 rounds to be done when storing a password hash onto disk."  , nullptr  , nullptr  , sha2_password::DEFAULT_STORED_DIGEST_ROUNDS  , sha2_password::MIN_STORED_DIGEST_ROUNDS  , sha2_password::MAX_STORED_DIGEST_ROUNDS  , 1    )

static

MYSQL_SYSVAR_STR() [1/2]

static MYSQL_SYSVAR_STR ( private_key_path  , caching_sha2_rsa_private_key_path  , PLUGIN_VAR_READONLY|  PLUGIN_VAR_NOPERSIST, "A fully qualified path to the private RSA key used for authentication."  , nullptr  , nullptr  , AUTH_DEFAULT_RSA_PRIVATE_KEY    )

static

MYSQL_SYSVAR_STR() [2/2]

static MYSQL_SYSVAR_STR ( public_key_path  , caching_sha2_rsa_public_key_path  , PLUGIN_VAR_READONLY|  PLUGIN_VAR_NOPERSIST, "A fully qualified path to the public RSA key used for authentication."  , nullptr  , nullptr  , AUTH_DEFAULT_RSA_PUBLIC_KEY    )

static

sha2_cache_cleaner_notify()

static int sha2_cache_cleaner_notify ( MYSQL_THD  , mysql_event_class_t  event_class, const void *  event  )

static

Handle an authentication audit event.

Parameters

[in]	event_class	Event class information
[in]	event	Event structure

Returns

Success always.

show_caching_sha2_password_rsa_public_key()

static int show_caching_sha2_password_rsa_public_key ( MYSQL_THD  thd, SHOW_VAR *  var, char *  buff  )

static

Function to display value for status variable : Caching_sha2_password_rsa_public_key.

Parameters

[in]	thd	MYSQL_THD handle. Unused.
[out]	var	Status variable structure
[in]	buff	Value buffer

Variable Documentation

caching_sha2_auth_plugin_ref

MYSQL_PLUGIN caching_sha2_auth_plugin_ref

static

caching_sha2_password plugin handle - Mostly used for logging

caching_sha2_auto_generate_rsa_keys

bool caching_sha2_auto_generate_rsa_keys = true

caching_sha2_digest_rounds

int caching_sha2_digest_rounds = 0

caching_sha2_password_status_variables

SHOW_VAR caching_sha2_password_status_variables[]

static

Initial value:

= {
    {"Caching_sha2_password_rsa_public_key",
     (char *)&show_caching_sha2_password_rsa_public_key, SHOW_FUNC,
     SHOW_SCOPE_GLOBAL},
    {nullptr, nullptr, enum_mysql_show_type(0), enum_mysql_show_scope(0)}}

Array of status variables.

Used in plugin declaration.

caching_sha2_password_sysvars

SYS_VAR* caching_sha2_password_sysvars[]

static

Initial value:

= {
    MYSQL_SYSVAR(private_key_path), MYSQL_SYSVAR(public_key_path),
    MYSQL_SYSVAR(auto_generate_rsa_keys), MYSQL_SYSVAR(digest_rounds), nullptr}

Array of system variables.

Used in plugin declaration.

caching_sha2_rsa_private_key_path

char* caching_sha2_rsa_private_key_path

caching_sha2_rsa_public_key_path

char* caching_sha2_rsa_public_key_path

fast_auth_success

char fast_auth_success = '\3'

static

g_caching_sha2_password

sha2_password::Caching_sha2_password* g_caching_sha2_password = nullptr

Caching_sha2_password handle.

g_caching_sha2_rsa_keys

Rsa_authentication_keys* g_caching_sha2_rsa_keys = nullptr

MAX_CIPHER_LENGTH

const int MAX_CIPHER_LENGTH = 1024

Length of encrypted packet.

perform_full_authentication

char perform_full_authentication = '\4'

static

request_public_key

char request_public_key = '\2'

static

sha2_cache_cleaner

struct st_mysql_audit sha2_cache_cleaner

Initial value:

= {
    MYSQL_AUDIT_INTERFACE_VERSION, 
    nullptr,                       
    sha2_cache_cleaner_notify,     
    {
        0, 
        0, 
        0, 
        0, 
        0, 
        0, 
        0, 
        0, 
        0, 
        0, 
        0, 
        (unsigned long)
            MYSQL_AUDIT_AUTHENTICATION_ALL 
    }}

st_mysql_audit for sha2_cache_cleaner plugin