Applier_security_context_guard Class Reference

Utility class to allow RAII pattern with Security_context class. More...

#include <rpl_rli.h>

Public Member Functions
	Applier_security_context_guard (Relay_log_info const *rli, THD const *thd)
	If needed, backs up the current thd security context and replaces it with a security context for PRIVILEGE_CHECKS_USER user. More...
virtual	~Applier_security_context_guard ()
	Destructor that restores the backed up security context, if needed. More...
	Applier_security_context_guard (const Applier_security_context_guard &)=delete
	Applier_security_context_guard (Applier_security_context_guard &&)=delete
Applier_security_context_guard &	operator= (const Applier_security_context_guard &)=delete
Applier_security_context_guard &	operator= (Applier_security_context_guard &&)=delete
bool	skip_priv_checks () const
	Returns whether or not privilege checks may be skipped within the current context. More...
bool	has_access (std::vector< std::tuple< Access_bitmask, TABLE const *, Rows_log_event * > > &extra_privileges) const
	Checks if the PRIVILEGE_CHECKS_USER user has access to the privilieges passed on by extra_privileges parameter as well as to the privileges passed on at initialization time. More...
bool	has_access (std::initializer_list< std::string_view > extra_privileges) const
	Checks if the PRIVILEGE_CHECKS_USER user has access to the privilieges passed on by extra_privileges parameter as well as to the privileges passed on at initialization time. More...
bool	has_access (std::initializer_list< Access_bitmask > extra_privileges) const
	Checks if the PRIVILEGE_CHECKS_USER user has access to the privilieges passed on by extra_privileges parameter as well as to the privileges passed on at initialization time. More...
std::string	get_username () const
	Returns the username for the user for which the security context was initialized. More...
std::string	get_hostname () const
	Returns the hostname for the user for which the security context was initialized. More...

Private Member Functions
void	extract_columns_to_check (TABLE const *table, Rows_log_event *event, std::vector< std::string > &columns) const

Private Attributes
Relay_log_info const *	m_target
	The Relay_log_info object holding the info required to initialize the context. More...
THD const *	m_thd
	The THD object for which the security context will be initialized. More...
Security_context	m_applier_security_ctx
	Applier security context based on PRIVILEGE_CHECK_USER user. More...
Security_context *	m_current
	Currently in use security context. More...
Security_context *	m_previous
	Backed up security context. More...
bool	m_privilege_checks_none
	Flag that states if privilege check should be skipped. More...
bool	m_logged_in_acl_user
	Flag that states if there is a logged user. More...

Detailed Description

Utility class to allow RAII pattern with Security_context class.

At initiliazation, if the THD main security context isn't already the appropriate one, it copies the Relay_log_info::info_thd::security_context and replaces it with the one initialized with the PRIVILEGE_CHECK_USER user. At deinitialization, it copies the backed up security context.

It also deals with the case where no privilege checks are required, meaning, PRIVILEGE_CHECKS_USER is NULL.

Usage examples:

(1)

Applier_security_context_guard security_context{rli, thd};
if (!security_context.has_access({SUPER_ACL})) {
  return ER_NO_ACCESS;
}

(4)

Applier_security_context_guard security_context{rli, thd};
if (!security_context.has_access(
        {{CREATE_ACL | INSERT_ACL | UPDATE_ACL, table},
         {SELECT_ACL, table}})) {
  return ER_NO_ACCESS;
}

Constructor & Destructor Documentation

Applier_security_context_guard() [1/3]

Applier_security_context_guard::Applier_security_context_guard	(	Relay_log_info const *	rli,
		THD const *	thd
	)

If needed, backs up the current thd security context and replaces it with a security context for PRIVILEGE_CHECKS_USER user.

Parameters

rli	the Relay_log_info object that holds the PRIVILEGE_CHECKS_USER info.
thd	the THD for which initialize the security context.

~Applier_security_context_guard()

Applier_security_context_guard::~Applier_security_context_guard ( )

virtual

Destructor that restores the backed up security context, if needed.

Applier_security_context_guard() [2/3]

Applier_security_context_guard::Applier_security_context_guard ( const Applier_security_context_guard &  )

delete

Applier_security_context_guard() [3/3]

Applier_security_context_guard::Applier_security_context_guard ( Applier_security_context_guard &&  )

delete

Member Function Documentation

extract_columns_to_check()

void Applier_security_context_guard::extract_columns_to_check ( TABLE const *  table, Rows_log_event *  event, std::vector< std::string > &  columns  ) const

private

get_hostname()

std::string Applier_security_context_guard::get_hostname

(

)

const

Returns the hostname for the user for which the security context was initialized.

If PRIVILEGE_CHECKS_USER was configured for the target Relay_log_info object, that one is returned.

Otherwise, the hostname associated with the Security_context initialized for Relay_log_info::info_thd will be returned.

Returns

an std::string holding the hostname for the active security context.

get_username()

std::string Applier_security_context_guard::get_username

(

)

const

Returns the username for the user for which the security context was initialized.

If PRIVILEGE_CHECKS_USER was configured for the target Relay_log_info object, that one is returned.

Otherwise, the username associated with the Security_context initialized for Relay_log_info::info_thd will be returned.

Returns

an std::string holding the username for the active security context.

has_access() [1/3]

bool Applier_security_context_guard::has_access

(

std::initializer_list< Access_bitmask >

extra_privileges

)

const

Checks if the PRIVILEGE_CHECKS_USER user has access to the privilieges passed on by extra_privileges parameter as well as to the privileges passed on at initialization time.

Parameters

extra_privileges

set of privileges to check, additionally to those passed on at initialization. It's a list of privileges to be checked against any database.

Returns

true if the privileges are included in the security context and false, otherwise.

has_access() [2/3]

bool Applier_security_context_guard::has_access

(

std::initializer_list< std::string_view >

extra_privileges

)

const

Checks if the PRIVILEGE_CHECKS_USER user has access to the privilieges passed on by extra_privileges parameter as well as to the privileges passed on at initialization time.

Parameters

extra_privileges

set of privileges to check, additionally to those passed on at initialization. It's a list of privileges to be checked against any database.

Returns

true if the privileges are included in the security context and false, otherwise.

has_access() [3/3]

bool Applier_security_context_guard::has_access

(

std::vector< std::tuple< Access_bitmask, TABLE const *, Rows_log_event * > > &

extra_privileges

)

const

Checks if the PRIVILEGE_CHECKS_USER user has access to the privilieges passed on by extra_privileges parameter as well as to the privileges passed on at initialization time.

This particular method checks those privileges against a given table and against that table's columns - the ones that are used or changed in the event.

Parameters

extra_privileges

set of privileges to check, additionally to those passed on at initialization. It's a list of (privilege, TABLE*, Rows_log_event*) tuples.

Returns

true if the privileges are included in the security context and false, otherwise.

operator=() [1/2]

Applier_security_context_guard & Applier_security_context_guard::operator= ( Applier_security_context_guard &&  )

delete

operator=() [2/2]

Applier_security_context_guard & Applier_security_context_guard::operator= ( const Applier_security_context_guard &  )

delete

skip_priv_checks()

bool Applier_security_context_guard::skip_priv_checks

(

)

const

Returns whether or not privilege checks may be skipped within the current context.

Returns

true if privilege checks may be skipped and false otherwise.

Member Data Documentation

m_applier_security_ctx

Security_context Applier_security_context_guard::m_applier_security_ctx

private

Applier security context based on PRIVILEGE_CHECK_USER user.

m_current

Security_context* Applier_security_context_guard::m_current

private

Currently in use security context.

m_logged_in_acl_user

bool Applier_security_context_guard::m_logged_in_acl_user

private

Flag that states if there is a logged user.

m_previous

Security_context* Applier_security_context_guard::m_previous

private

Backed up security context.

m_privilege_checks_none

bool Applier_security_context_guard::m_privilege_checks_none

private

Flag that states if privilege check should be skipped.

m_target

Relay_log_info const* Applier_security_context_guard::m_target

private

The Relay_log_info object holding the info required to initialize the context.

m_thd

THD const* Applier_security_context_guard::m_thd

private

The THD object for which the security context will be initialized.

---

The documentation for this class was generated from the following files:

• sql/rpl_rli.h
• sql/rpl_rli.cc