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set_role (7)
  • >> set_role (7) ( Linux man: Макропакеты и соглашения )
  •  

    NAME

    SET ROLE - set the current user identifier of the current session
    

     

    SYNOPSIS

    SET [ SESSION | LOCAL ] ROLE rolename
    SET [ SESSION | LOCAL ] ROLE NONE
    RESET ROLE
    
    
     

    DESCRIPTION

    This command sets the current user identifier of the current SQL session to be rolename. The role name may be written as either an identifier or a string literal. After SET ROLE, permissions checking for SQL commands is carried out as though the named role were the one that had logged in originally.

    The specified rolename must be a role that the current session user is a member of. (If the session user is a superuser, any role can be selected.)

    The SESSION and LOCAL modifiers act the same as for the regular SET [set(7)] command.

    The NONE and RESET forms reset the current user identifier to be the current session user identifier. These forms may be executed by any user.  

    NOTES

    Using this command, it is possible to either add privileges or restrict one's privileges. If the session user role has the INHERITS attribute, then it automatically has all the privileges of every role that it could SET ROLE to; in this case SET ROLE effectively drops all the privileges assigned directly to the session user and to the other roles it is a member of, leaving only the privileges available to the named role. On the other hand, if the session user role has the NOINHERITS attribute, SET ROLE drops the privileges assigned directly to the session user and instead acquires the privileges available to the named role.

    In particular, when a superuser chooses to SET ROLE to a non-superuser role, she loses her superuser privileges.

    SET ROLE has effects comparable to SET SESSION AUTHORIZATION [set_session_authorization(7)], but the privilege checks involved are quite different. Also, SET SESSION AUTHORIZATION determines which roles are allowable for later SET ROLE commands, whereas changing roles with SET ROLE does not change the set of roles allowed to a later SET ROLE.

    SET ROLE cannot be used within a SECURITY DEFINER function.  

    EXAMPLES

    SELECT SESSION_USER, CURRENT_USER;
    
     session_user | current_user 
    --------------+--------------
     peter        | peter
    
    SET ROLE 'paul';
    
    SELECT SESSION_USER, CURRENT_USER;
    
     session_user | current_user 
    --------------+--------------
     peter        | paul
    
    
     

    COMPATIBILITY

    PostgreSQL allows identifier syntax ("rolename"), while the SQL standard requires the role name to be written as a string literal. SQL does not allow this command during a transaction; PostgreSQL does not make this restriction because there is no reason to. The SESSION and LOCAL modifiers are a PostgreSQL extension, as is the RESET syntax.  

    SEE ALSO

    SET SESSION AUTHORIZATION [set_session_authorization(7)]


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    NOTES
    EXAMPLES
    COMPATIBILITY
    SEE ALSO


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