Implement differentiation between CURRENT_USER and SESSION_USER as per SQL.
There is still no effective difference but it will kick in once setuid functions exist (not included here). Make old getpgusername() alias for current_user.
This commit is contained in:
Peter Eisentraut
parent
e9c3f0255f
commit
457ac0331c
@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.35 2000/08/29 20:02:07 momjian Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.36 2000/09/19 18:17:53 petere Exp $
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-->
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<chapter id="datatype">
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@ -211,11 +211,6 @@ $Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.35 2000/08/29 20:02:07 mo
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</row>
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</thead>
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<tbody>
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<row>
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<entry>getpgusername()</entry>
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<entry>current_user</entry>
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<entry>user name in current session</entry>
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</row>
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<row>
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<entry>date('now')</entry>
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<entry>current_date</entry>
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@ -1509,6 +1509,61 @@ Not defined by this name. Implements the intersection operator '#'
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</sect1>
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<sect1>
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<title id="misc-funcs">Miscellaneous Functions</>
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<table>
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<title>Miscellaneous Functions</>
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<tgroup cols="3">
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<thead>
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<row><entry>Name</> <entry>Return type</> <entry>Description</></row>
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</thead>
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<tbody>
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<row>
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<entry>current_user</>
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<entry>name</>
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<entry>user name of current execution context</>
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</row>
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<row>
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<entry>user</>
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<entry>name</>
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<entry>equivalent to <function>current_user</></>
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</row>
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<row>
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<entry>session_user</>
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<entry>name</>
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<entry>session user name</>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>
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The <function>session_user</> is the user that initiated a database
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connection and is fixed for the duration of that connection. The
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<function>current_user</> is the user identifier that is applicable
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for permission checking. Currently it is always equal to the session
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user, but in the future there might be <quote>setuid</> functions and
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other facilities to allow the current user to change temporarily.
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In Unix parlance, the session user is the <quote>real user</>
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and the current user is the <quote>effective user</>.
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</para>
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<para>
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Note that these functions have special syntactic status in <acronym>SQL</>;
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they must be called without trailing parentheses.
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</para>
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<note>
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<title>Deprecated</>
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<para>
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The function <function>getpgusername()</> is an obsolete equivalent
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of <function>current_user</>.
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</para>
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</note>
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</sect1>
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<sect1>
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<title id="aggregate-funcs">Aggregate Functions</title>
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@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Header: /cvsroot/pgsql/src/backend/commands/user.c,v 1.67 2000/08/27 21:50:17 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/commands/user.c,v 1.68 2000/09/19 18:17:54 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -348,7 +348,7 @@ AlterUser(AlterUserStmt *stmt)
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/* must be superuser or just want to change your own password */
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if (!superuser() &&
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!(stmt->createdb == 0 && stmt->createuser == 0 && !stmt->validUntil
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&& stmt->password && strcmp(GetPgUserName(), stmt->user) == 0))
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&& stmt->password && strcmp(GetUserName(GetUserId()), stmt->user) == 0))
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elog(ERROR, "ALTER USER: permission denied");
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/* changes to the flat password file cannot be rolled back */
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@ -11,7 +11,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.190 2000/09/15 18:45:30 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.191 2000/09/19 18:17:55 petere Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -4993,7 +4993,7 @@ c_expr: attr
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| CURRENT_USER
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "getpgusername";
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n->funcname = "current_user";
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n->args = NIL;
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n->agg_star = FALSE;
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n->agg_distinct = FALSE;
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@ -5002,7 +5002,7 @@ c_expr: attr
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| SESSION_USER
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "getpgusername";
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n->funcname = "session_user";
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n->args = NIL;
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n->agg_star = FALSE;
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n->agg_distinct = FALSE;
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@ -5011,7 +5011,7 @@ c_expr: attr
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| USER
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{
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FuncCall *n = makeNode(FuncCall);
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n->funcname = "getpgusername";
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n->funcname = "current_user";
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n->args = NIL;
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n->agg_star = FALSE;
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n->agg_distinct = FALSE;
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@ -12,7 +12,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/name.c,v 1.29 2000/08/03 16:34:22 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/name.c,v 1.30 2000/09/19 18:17:56 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -136,13 +136,6 @@ namege(PG_FUNCTION_ARGS)
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PG_RETURN_BOOL(strncmp(NameStr(*arg1), NameStr(*arg2), NAMEDATALEN) >= 0);
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}
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/* SQL-function interface to GetPgUserName() */
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Datum
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getpgusername(PG_FUNCTION_ARGS)
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{
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PG_RETURN_DATUM(DirectFunctionCall1(namein,
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CStringGetDatum(GetPgUserName())));
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}
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/* (see char.c for comparison/operation routines) */
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@ -218,6 +211,21 @@ namestrcmp(Name name, const char *str)
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return strncmp(NameStr(*name), str, NAMEDATALEN);
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}
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/* SQL-functions CURRENT_USER and SESSION_USER */
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Datum
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current_user(PG_FUNCTION_ARGS)
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{
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PG_RETURN_DATUM(DirectFunctionCall1(namein, CStringGetDatum(GetUserName(GetUserId()))));
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}
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Datum
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session_user(PG_FUNCTION_ARGS)
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{
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PG_RETURN_DATUM(DirectFunctionCall1(namein, CStringGetDatum(GetUserName(GetSessionUserId()))));
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}
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/*****************************************************************************
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* PRIVATE ROUTINES *
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*****************************************************************************/
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.54 2000/09/06 14:15:22 petere Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.55 2000/09/19 18:17:57 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -272,50 +272,65 @@ convertstr(unsigned char *buff, int len, int dest)
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#endif
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/* ----------------
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* GetPgUserName
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* ----------------
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*/
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char *
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GetPgUserName(void)
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{
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HeapTuple tuple;
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Oid userid;
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userid = GetUserId();
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tuple = SearchSysCacheTuple(SHADOWSYSID, ObjectIdGetDatum(userid), 0, 0, 0);
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "invalid user id %u", (unsigned) userid);
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return pstrdup( NameStr(((Form_pg_shadow) GETSTRUCT(tuple))->usename) );
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}
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/* ----------------------------------------------------------------
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* GetUserId and SetUserId
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* User ID things
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*
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* The session user is determined at connection start and never
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* changes. The current user may change when "setuid" functions
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* are implemented. Conceptually there is a stack, whose bottom
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* is the session user. You are yourself responsible to save and
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* restore the current user id if you need to change it.
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* ----------------------------------------------------------------
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*/
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static Oid UserId = InvalidOid;
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static Oid CurrentUserId = InvalidOid;
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static Oid SessionUserId = InvalidOid;
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/*
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* This function is relevant for all privilege checks.
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*/
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Oid
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GetUserId()
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GetUserId(void)
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{
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AssertState(OidIsValid(UserId));
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return UserId;
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AssertState(OidIsValid(CurrentUserId));
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return CurrentUserId;
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}
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void
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SetUserId(Oid newid)
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{
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UserId = newid;
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AssertArg(OidIsValid(newid));
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CurrentUserId = newid;
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}
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/*
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* This value is only relevant for informational purposes.
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*/
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Oid
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GetSessionUserId(void)
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{
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AssertState(OidIsValid(SessionUserId));
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return SessionUserId;
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}
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void
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SetUserIdFromUserName(const char *username)
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SetSessionUserId(Oid newid)
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{
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AssertArg(OidIsValid(newid));
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SessionUserId = newid;
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/* Current user defaults to session user. */
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if (!OidIsValid(CurrentUserId))
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CurrentUserId = newid;
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}
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void
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SetSessionUserIdFromUserName(const char *username)
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{
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HeapTuple userTup;
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@ -330,13 +345,30 @@ SetUserIdFromUserName(const char *username)
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0, 0, 0);
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if (!HeapTupleIsValid(userTup))
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elog(FATAL, "user \"%s\" does not exist", username);
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SetUserId( ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid );
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SetSessionUserId( ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid );
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}
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/*
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* Get user name from user id
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*/
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char *
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GetUserName(Oid userid)
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{
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HeapTuple tuple;
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tuple = SearchSysCacheTuple(SHADOWSYSID, ObjectIdGetDatum(userid), 0, 0, 0);
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "invalid user id %u", (unsigned) userid);
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return pstrdup( NameStr(((Form_pg_shadow) GETSTRUCT(tuple))->usename) );
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}
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/*-------------------------------------------------------------------------
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*
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* posmaster pid file stuffs. $DATADIR/postmaster.pid is created when:
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* postmaster pid file stuffs. $DATADIR/postmaster.pid is created when:
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*
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* (1) postmaster starts. In this case pid > 0.
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* (2) postgres starts in standalone mode. In this case
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.65 2000/09/06 14:15:22 petere Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.66 2000/09/19 18:17:57 petere Exp $
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*
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*
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*-------------------------------------------------------------------------
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@ -374,9 +374,9 @@ InitPostgres(const char *dbname, const char *username)
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* user id.
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*/
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if (bootstrap)
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SetUserId(geteuid());
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SetSessionUserId(geteuid());
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else
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SetUserIdFromUserName(username);
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SetSessionUserIdFromUserName(username);
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setuid(geteuid());
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@ -37,7 +37,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: catversion.h,v 1.46 2000/09/15 18:45:27 tgl Exp $
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* $Id: catversion.h,v 1.47 2000/09/19 18:18:01 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -53,6 +53,6 @@
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*/
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/* yyyymmddN */
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#define CATALOG_VERSION_NO 200009151
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#define CATALOG_VERSION_NO 200009191
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#endif
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: pg_proc.h,v 1.166 2000/09/15 18:45:27 tgl Exp $
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* $Id: pg_proc.h,v 1.167 2000/09/19 18:18:01 petere Exp $
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*
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* NOTES
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* The script catalog/genbki.sh reads this file and generates .bki
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@ -928,8 +928,8 @@ DATA(insert OID = 681 ( oidvectorgt PGUID 12 f t t t 2 f 16 "30 30" 100 0 0
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DESCR("greater-than");
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/* OIDS 700 - 799 */
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DATA(insert OID = 710 ( getpgusername PGUID 12 f t f t 0 f 19 "0" 100 0 0 100 getpgusername - ));
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DESCR("Return username");
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DATA(insert OID = 710 ( getpgusername PGUID 12 f t f t 0 f 19 "0" 100 0 0 100 current_user - ));
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DESCR("deprecated -- use current_user");
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DATA(insert OID = 711 ( userfntest PGUID 12 f t t t 1 f 23 "23" 100 0 0 100 userfntest - ));
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DESCR("");
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DATA(insert OID = 713 ( oidrand PGUID 12 f t f t 2 f 16 "26 23" 100 0 0 100 oidrand - ));
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@ -974,6 +974,12 @@ DESCR("greater-than-or-equal");
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DATA(insert OID = 744 ( array_eq PGUID 12 f t t t 2 f 16 "0 0" 100 0 0 100 array_eq -));
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DESCR("array equal");
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DATA(insert OID = 745 ( current_user PGUID 12 f t f t 0 f 19 "0" 100 0 0 100 current_user - ));
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DESCR("current user name");
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DATA(insert OID = 746 ( session_user PGUID 12 f t f t 0 f 19 "0" 100 0 0 100 session_user - ));
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DESCR("session user name");
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DATA(insert OID = 747 ( array_dims PGUID 12 f t t t 1 f 25 "0" 100 0 0 100 array_dims -));
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DESCR("array dimensions");
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DATA(insert OID = 750 ( array_in PGUID 12 f t t t 3 f 23 "0 26 23" 100 0 0 100 array_in - ));
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@ -12,7 +12,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: miscadmin.h,v 1.66 2000/09/06 19:54:52 petere Exp $
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* $Id: miscadmin.h,v 1.67 2000/09/19 18:17:58 petere Exp $
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*
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* NOTES
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* some of the information in this file will be moved to
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@ -128,10 +128,14 @@ extern char *ExpandDatabasePath(const char *path);
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extern void SetDatabaseName(const char *name);
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extern void SetDatabasePath(const char *path);
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extern char *GetPgUserName(void);
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extern Oid GetUserId(void);
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extern char *GetUserName(Oid userid);
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extern Oid GetUserId(void);
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extern void SetUserId(Oid userid);
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extern void SetUserIdFromUserName(const char *username);
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extern Oid GetSessionUserId(void);
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extern void SetSessionUserId(Oid userid);
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extern void SetSessionUserIdFromUserName(const char *username);
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extern int FindExec(char *full_path, const char *argv0, const char *binary_name);
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extern int CheckPathAccess(char *path, char *name, int open_mode);
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: builtins.h,v 1.137 2000/09/15 18:45:29 tgl Exp $
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* $Id: builtins.h,v 1.138 2000/09/19 18:18:02 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -136,10 +136,11 @@ extern Datum namelt(PG_FUNCTION_ARGS);
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extern Datum namele(PG_FUNCTION_ARGS);
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extern Datum namegt(PG_FUNCTION_ARGS);
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extern Datum namege(PG_FUNCTION_ARGS);
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extern Datum getpgusername(PG_FUNCTION_ARGS);
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extern int namecpy(Name n1, Name n2);
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extern int namestrcpy(Name name, const char *str);
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extern int namestrcmp(Name name, const char *str);
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extern Datum current_user(PG_FUNCTION_ARGS);
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extern Datum session_user(PG_FUNCTION_ARGS);
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/* numutils.c */
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extern int32 pg_atoi(char *s, int size, int c);
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@ -1231,9 +1231,9 @@ SELECT tablename, rulename, definition FROM pg_rules
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ORDER BY tablename, rulename;
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tablename | rulename | definition
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---------------+-----------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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rtest_emp | rtest_emp_del | CREATE RULE rtest_emp_del AS ON DELETE TO rtest_emp DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (old.ename, getpgusername(), 'fired '::bpchar, '$0.00'::money, old.salary);
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rtest_emp | rtest_emp_ins | CREATE RULE rtest_emp_ins AS ON INSERT TO rtest_emp DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (new.ename, getpgusername(), 'hired '::bpchar, new.salary, '$0.00'::money);
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rtest_emp | rtest_emp_upd | CREATE RULE rtest_emp_upd AS ON UPDATE TO rtest_emp WHERE (new.salary <> old.salary) DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (new.ename, getpgusername(), 'honored '::bpchar, new.salary, old.salary);
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rtest_emp | rtest_emp_del | CREATE RULE rtest_emp_del AS ON DELETE TO rtest_emp DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (old.ename, "current_user"(), 'fired '::bpchar, '$0.00'::money, old.salary);
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rtest_emp | rtest_emp_ins | CREATE RULE rtest_emp_ins AS ON INSERT TO rtest_emp DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (new.ename, "current_user"(), 'hired '::bpchar, new.salary, '$0.00'::money);
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rtest_emp | rtest_emp_upd | CREATE RULE rtest_emp_upd AS ON UPDATE TO rtest_emp WHERE (new.salary <> old.salary) DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (new.ename, "current_user"(), 'honored '::bpchar, new.salary, old.salary);
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rtest_nothn1 | rtest_nothn_r1 | CREATE RULE rtest_nothn_r1 AS ON INSERT TO rtest_nothn1 WHERE ((new.a >= 10) AND (new.a < 20)) DO INSTEAD SELECT 1;
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rtest_nothn1 | rtest_nothn_r2 | CREATE RULE rtest_nothn_r2 AS ON INSERT TO rtest_nothn1 WHERE ((new.a >= 30) AND (new.a < 40)) DO INSTEAD NOTHING;
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rtest_nothn2 | rtest_nothn_r3 | CREATE RULE rtest_nothn_r3 AS ON INSERT TO rtest_nothn2 WHERE (new.a >= 100) DO INSTEAD INSERT INTO rtest_nothn3 (a, b) VALUES (new.a, new.b);
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Reference in New Issue
Block a user