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Add SET SESSION AUTHORIZATION command.

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This commit is contained in:
Peter Eisentraut 2001-05-08 21:06:43 +00:00
parent c50aa9db70
commit 1c1c58c76c
10 changed files with 179 additions and 16 deletions
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3
doc/src/sgml/ref/allfiles.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.29 2001/05/08 19:28:01 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.30 2001/05/08 21:06:42 petere Exp $
Postgres documentation
Complete list of usable sgml source files in this directory.
-->
@ -98,6 +98,7 @@ Complete list of usable sgml source files in this directory.
<!entity selectInto system "select_into.sgml">
<!entity set system "set.sgml">
<!entity setConstraints system "set_constraints.sgml">
<!entity setSessionAuth system "set_session_auth.sgml">
<!entity setTransaction system "set_transaction.sgml">
<!entity show system "show.sgml">
<!entity truncate system "truncate.sgml">

103
doc/src/sgml/ref/set_session_auth.sgml Normal file
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@ -0,0 +1,103 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_session_auth.sgml,v 1.1 2001/05/08 21:06:42 petere Exp $ -->
<refentry id="SQL-SET-SESSION-AUTHORIZATION">
<docinfo>
<date>2001-04-21</date>
</docinfo>
<refmeta>
<refentrytitle>SET SESSION AUTHORIZATION</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>SET SESSION AUTHORIZATION</refname>
<refpurpose>Set the session user identifier and the current user identifier
of the current SQL-session context</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
SET SESSION AUTHORIZATION '<parameter>username</parameter>'
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
This command sets the session user identifier and the current user
identifer of the current SQL-session context to be
<parameter>username</parameter>.
</para>
<para>
The session user identifier is initially set to be the (possibly
authenticated) user name provided by the client. The current user
identifier is normally equal to the session user identifier, but
may change temporarily in the context of <quote>setuid</quote>
functions and similar mechanisms. The current user identifer is
relevant for permission checking.
</para>
<para>
Execution of this command is only permitted if the initial session
user (the <firstterm>authenticated user</firstterm>) had the
superuser privilege. This permission is kept for the duration of a
connection; for example, it is possible to temporarily become an
unprivileged user and later switch back to become a superuser.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<screen>
<userinput>SELECT SESSION_USER, CURRENT_USER;</userinput>
current_user | session_user
--------------+--------------
peter | peter
<userinput>SET SESSION AUTHORIZATION 'paul';</userinput>
<userinput>SELECT SESSION_USER, CURRENT_USER;</userinput>
current_user | session_user
--------------+--------------
paul | paul
</screen>
</refsect1>
<refsect1>
<title>Compatibility</title>
<simpara>SQL99</simpara>
<para>
SQL99 allows some other expressions to appear in place of the
literal <parameter>username</parameter> which are not important in
practice. <application>PostgreSQL</application> allows identifier
syntax (<literal>"username"</literal>), which SQL does not. SQL
does not allow this command during a transaction;
<application>PostgreSQL</application> does not make
this restriction because there is no reason to. The
privileges necessary to execute this command are left
implementation-defined by the standard.
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode:sgml
sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
sgml-parent-document:nil
sgml-default-dtd-file:"../reference.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:("/usr/lib/sgml/catalog")
sgml-local-ecat-files:nil
End:
-->

4
doc/src/sgml/reference.sgml
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@ -1,5 +1,5 @@
<!-- reference.sgml
$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.16 2001/05/07 00:43:14 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.17 2001/05/08 21:06:42 petere Exp $
PostgreSQL Reference Manual
-->
@ -84,6 +84,7 @@ PostgreSQL Reference Manual
&selectInto;
&set;
&setConstraints;
&setSessionAuth;
&setTransaction;
&show;
&truncate;
@ -131,7 +132,6 @@ Disable this chapter until we have more functions documented.
&dropuser;
&ecpgRef;
&pgAccess;
&pgAdmin;
&pgConfig;
&pgDump;
&pgDumpall;

4
src/backend/commands/variable.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.47 2001/03/29 19:03:57 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.48 2001/05/08 21:06:42 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -721,6 +721,8 @@ SetPGVariable(const char *name, const char *value)
parse_server_encoding(mvalue);
else if (strcasecmp(name, "seed") == 0)
parse_random_seed(mvalue);
else if (strcasecmp(name, "session_authorization") == 0)
SetSessionAuthorization(value);
else
SetConfigOption(name, value, superuser() ? PGC_SUSET : PGC_USERSET);

18
src/backend/parser/gram.y
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@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.223 2001/05/07 00:43:23 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.224 2001/05/08 21:06:42 petere Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -259,7 +259,7 @@ static void doNegateFloat(Value *v);
%type <ival> Iconst
%type <str> Sconst, comment_text
%type <str> UserId, opt_boolean, var_value, zone_value
%type <str> UserId, opt_boolean, var_value, zone_value, Ident_or_Sconst
%type <str> ColId, ColLabel, TokenId
%type <node> TableConstraint
@ -292,7 +292,7 @@ static void doNegateFloat(Value *v);
*/
/* Keywords (in SQL92 reserved words) */
%token ABSOLUTE, ACTION, ADD, ALL, ALTER, AND, ANY, AS, ASC, AT,
%token ABSOLUTE, ACTION, ADD, ALL, ALTER, AND, ANY, AS, ASC, AT, AUTHORIZATION,
BEGIN_TRANS, BETWEEN, BOTH, BY,
CASCADE, CASE, CAST, CHAR, CHARACTER, CHECK, CLOSE,
COALESCE, COLLATE, COLUMN, COMMIT,
@ -761,6 +761,13 @@ VariableSetStmt: SET ColId TO var_value
n->value = $3;
$$ = (Node *) n;
}
| SET SESSION AUTHORIZATION Ident_or_Sconst
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->name = "session_authorization";
n->value = $4;
$$ = (Node *) n;
}
;
opt_level: READ COMMITTED { $$ = "committed"; }
@ -837,6 +844,10 @@ opt_encoding: Sconst { $$ = $1; }
| /*EMPTY*/ { $$ = NULL; }
;
Ident_or_Sconst: IDENT { $$ = $1; }
| SCONST { $$ = $1; }
VariableShowStmt: SHOW ColId
{
VariableShowStmt *n = makeNode(VariableShowStmt);
@ -5459,6 +5470,7 @@ TokenId: ABSOLUTE { $$ = "absolute"; }
| AGGREGATE { $$ = "aggregate"; }
| ALTER { $$ = "alter"; }
| AT { $$ = "at"; }
| AUTHORIZATION { $$ = "authorization"; }
| BACKWARD { $$ = "backward"; }
| BEFORE { $$ = "before"; }
| BEGIN_TRANS { $$ = "begin"; }

3
src/backend/parser/keywords.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.91 2001/05/07 00:43:23 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.92 2001/05/08 21:06:43 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -44,6 +44,7 @@ static ScanKeyword ScanKeywords[] = {
{"as", AS},
{"asc", ASC},
{"at", AT},
{"authorization", AUTHORIZATION},
{"backward", BACKWARD},
{"before", BEFORE},
{"begin", BEGIN_TRANS},

31
src/backend/utils/init/miscinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.65 2001/04/16 02:42:01 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.66 2001/05/08 21:06:43 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -354,6 +354,7 @@ convertstr(unsigned char *buff, int len, int dest)
static Oid CurrentUserId = InvalidOid;
static Oid SessionUserId = InvalidOid;
static bool AuthenticatedUserIsSuperuser = false;
/*
* This function is relevant for all privilege checks.
@ -397,7 +398,7 @@ SetSessionUserId(Oid newid)
void
SetSessionUserIdFromUserName(const char *username)
InitializeSessionUserId(const char *username)
{
HeapTuple userTup;
@ -407,6 +408,9 @@ SetSessionUserIdFromUserName(const char *username)
*/
AssertState(!IsBootstrapProcessingMode());
/* call only once */
AssertState(!OidIsValid(SessionUserId));
userTup = SearchSysCache(SHADOWNAME,
PointerGetDatum(username),
0, 0, 0);
@ -415,6 +419,29 @@ SetSessionUserIdFromUserName(const char *username)
SetSessionUserId(((Form_pg_shadow) GETSTRUCT(userTup))->usesysid);
AuthenticatedUserIsSuperuser = ((Form_pg_shadow) GETSTRUCT(userTup))->usesuper;
ReleaseSysCache(userTup);
}
void SetSessionAuthorization(const char * username)
{
HeapTuple userTup;
if (!AuthenticatedUserIsSuperuser)
elog(ERROR, "permission denied");
userTup = SearchSysCache(SHADOWNAME,
PointerGetDatum(username),
0, 0, 0);
if (!HeapTupleIsValid(userTup))
elog(ERROR, "user \"%s\" does not exist", username);
SetSessionUserId(((Form_pg_shadow) GETSTRUCT(userTup))->usesysid);
SetUserId(((Form_pg_shadow) GETSTRUCT(userTup))->usesysid);
ReleaseSysCache(userTup);
}

4
src/backend/utils/init/postinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.84 2001/04/21 18:29:29 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.85 2001/05/08 21:06:43 petere Exp $
*
*
*-------------------------------------------------------------------------
@ -341,7 +341,7 @@ InitPostgres(const char *dbname, const char *username)
if (bootstrap)
SetSessionUserId(geteuid());
else
SetSessionUserIdFromUserName(username);
InitializeSessionUserId(username);
/*
* Unless we are bootstrapping, double-check that InitMyDatabaseInfo()

20
src/bin/psql/tab-complete.c
View File

@ -3,7 +3,7 @@
*
* Copyright 2000 by PostgreSQL Global Development Group
*
* $Header: /cvsroot/pgsql/src/bin/psql/tab-complete.c,v 1.31 2001/05/07 19:31:33 petere Exp $
* $Header: /cvsroot/pgsql/src/bin/psql/tab-complete.c,v 1.32 2001/05/08 21:06:43 petere Exp $
*/
/*----------------------------------------------------------------------
@ -201,7 +201,7 @@ psql_completion(char *text, int start, int end)
/* these SET arguments are known in gram.y */
"CONSTRAINTS",
"NAMES",
"SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL",
"SESSION",
"TRANSACTION ISOLATION LEVEL",
/* these are treated in backend/commands/variable.c */
"DateStyle",
@ -646,6 +646,22 @@ psql_completion(char *text, int start, int end)
COMPLETE_WITH_LIST(constraint_list);
}
/* Complete SET SESSION with AUTHORIZATION or CHARACTERISTICS... */
else if (strcasecmp(prev2_wd, "SET") == 0 && strcasecmp(prev_wd, "SESSION") == 0)
{
char *my_list[] = {"AUTHORIZATION",
"CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL",
NULL};
COMPLETE_WITH_LIST(my_list);
}
/* Complete SET SESSION AUTHORIZATION with username */
else if (strcasecmp(prev3_wd, "SET") == 0
&& strcasecmp(prev2_wd, "SESSION") == 0
&& strcasecmp(prev_wd, "AUTHORIZATION") == 0)
{
COMPLETE_WITH_QUERY(Query_for_list_of_users);
}
/* Complete SET <var> with "TO" */
else if (strcasecmp(prev2_wd, "SET") == 0 &&
strcasecmp(prev4_wd, "UPDATE") != 0)

5
src/include/miscadmin.h
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: miscadmin.h,v 1.83 2001/03/22 04:00:25 momjian Exp $
* $Id: miscadmin.h,v 1.84 2001/05/08 21:06:43 petere Exp $
*
* NOTES
* some of the information in this file should be moved to
@ -208,7 +208,8 @@ extern Oid GetUserId(void);
extern void SetUserId(Oid userid);
extern Oid GetSessionUserId(void);
extern void SetSessionUserId(Oid userid);
extern void SetSessionUserIdFromUserName(const char *username);
extern void InitializeSessionUserId(const char *username);
extern void SetSessionAuthorization(const char *username);
extern void SetDataDir(const char *dir);