Prevent ALTER USER f RESET ALL from removing the settings that were put there

by a superuser -- "ALTER USER f RESET setting" already disallows removing such a
setting.

Apply the same treatment to ALTER DATABASE d RESET ALL when run by a database
owner that's not superuser.

diff --git a/src/backend/commands/dbcommands.c b/src/backend/commands/dbcommands.c
index 13bb4f92c227d6faa2d315374f48ad343e5a8bfc..7a52e8c8f3d62eba5846b9110283368c6e4fb323 100644 (file)
--- a/src/backend/commands/dbcommands.c
+++ b/src/backend/commands/dbcommands.c
@@ -13,7 +13,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.187.2.3 2008/04/17 00:00:00 tgl Exp $
+ *       $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.187.2.4 2010/03/25 14:45:21 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -916,9 +916,30 @@ AlterDatabaseSet(AlterDatabaseSetStmt *stmt)
 
        if (strcmp(stmt->variable, "all") == 0 && valuestr == NULL)
        {
-               /* RESET ALL */
-               repl_null[Anum_pg_database_datconfig - 1] = 'n';
-               repl_val[Anum_pg_database_datconfig - 1] = (Datum) 0;
+               ArrayType  *new = NULL;
+               Datum           datum;
+               bool            isnull;
+
+               /*
+                * in RESET ALL, request GUC to reset the settings array; if none
+                * left, we can set datconfig to null; otherwise use the returned
+                * array
+                */
+               datum = heap_getattr(tuple, Anum_pg_database_datconfig,
+                                                        RelationGetDescr(rel), &isnull);
+               if (!isnull)
+                       new = GUCArrayReset(DatumGetArrayTypeP(datum));
+               if (new)
+               {
+                       repl_val[Anum_pg_database_datconfig - 1] = PointerGetDatum(new);
+                       repl_repl[Anum_pg_database_datconfig - 1] = 'r';
+                       repl_null[Anum_pg_database_datconfig - 1] = ' ';
+               }
+               else
+               {
+                       repl_null[Anum_pg_database_datconfig - 1] = 'n';
+                       repl_val[Anum_pg_database_datconfig - 1] = (Datum) 0;
+               }
        }
        else
        {

diff --git a/src/backend/commands/user.c b/src/backend/commands/user.c
index 2e9b27a5988ba24ebc72738c6c0e85d846e082c9..9965068887ce71c52407a4066ec5c55306333e10 100644 (file)
--- a/src/backend/commands/user.c
+++ b/src/backend/commands/user.c
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/commands/user.c,v 1.174 2006/10/04 00:29:51 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/commands/user.c,v 1.174.2.1 2010/03/25 14:45:21 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -760,8 +760,30 @@ AlterRoleSet(AlterRoleSetStmt *stmt)
        repl_repl[Anum_pg_authid_rolconfig - 1] = 'r';
        if (strcmp(stmt->variable, "all") == 0 && valuestr == NULL)
        {
-               /* RESET ALL */
-               repl_null[Anum_pg_authid_rolconfig - 1] = 'n';
+               ArrayType  *new = NULL;
+               Datum           datum;
+               bool            isnull;
+
+               /*
+                * in RESET ALL, request GUC to reset the settings array; if none
+                * left, we can set rolconfig to null; otherwise use the returned
+                * array
+                */
+               datum = SysCacheGetAttr(AUTHNAME, oldtuple,
+                                                               Anum_pg_authid_rolconfig, &isnull);
+               if (!isnull)
+                       new = GUCArrayReset(DatumGetArrayTypeP(datum));
+               if (new)
+               {
+                       repl_val[Anum_pg_authid_rolconfig - 1] = PointerGetDatum(new);
+                       repl_repl[Anum_pg_authid_rolconfig - 1] = 'r';
+                       repl_null[Anum_pg_authid_rolconfig - 1] = ' ';
+               }
+               else
+               {
+                       repl_null[Anum_pg_authid_rolconfig - 1] = 'n';
+                       repl_val[Anum_pg_authid_rolconfig - 1] = (Datum) 0;
+               }
        }
        else
        {

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index d8a82ee10d3ba3f346351c94af6dcfbdd66f2ea9..349967b955945d6d09e08bdcf00650e9899474d4 100644 (file)
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.360.2.7 2010/02/25 13:26:19 mha Exp $
+ *       $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.360.2.8 2010/03/25 14:45:21 alvherre Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -5961,6 +5961,7 @@ ProcessGUCArray(ArrayType *array, GucSource source)
                free(name);
                if (value)
                        free(value);
+               pfree(s);
        }
 }
 
@@ -6095,6 +6096,7 @@ GUCArrayDelete(ArrayType *array, const char *name)
                        && val[strlen(name)] == '=')
                        continue;
 
+
                /* else add it to the output array */
                if (newarray)
                {
@@ -6117,6 +6119,85 @@ GUCArrayDelete(ArrayType *array, const char *name)
        return newarray;
 }
 
+/*
+ * Given a GUC array, delete all settings from it that our permission
+ * level allows: if superuser, delete them all; if regular user, only
+ * those that are PGC_USERSET
+ */
+ArrayType *
+GUCArrayReset(ArrayType *array)
+{
+       ArrayType  *newarray;
+       int                     i;
+       int                     index;
+
+       /* if array is currently null, nothing to do */
+       if (!array)
+               return NULL;
+
+       /* if we're superuser, we can delete everything */
+       if (superuser())
+               return NULL;
+
+       newarray = NULL;
+       index = 1;
+
+       for (i = 1; i <= ARR_DIMS(array)[0]; i++)
+       {
+               Datum           d;
+               char       *val;
+               char       *eqsgn;
+               bool            isnull;
+               struct config_generic *gconf;
+
+               d = array_ref(array, 1, &i,
+                                         -1 /* varlenarray */ ,
+                                         -1 /* TEXT's typlen */ ,
+                                         false /* TEXT's typbyval */ ,
+                                         'i' /* TEXT's typalign */ ,
+                                         &isnull);
+
+               if (isnull)
+                       continue;
+               val = DatumGetCString(DirectFunctionCall1(textout, d));
+
+               eqsgn = strchr(val, '=');
+               *eqsgn = '\0';
+
+               gconf = find_option(val, WARNING);
+               if (!gconf)
+                       continue;
+
+               /* note: superuser-ness was already checked above */
+               /* skip entry if OK to delete */
+               if (gconf->context == PGC_USERSET)
+                       continue;
+
+               /* XXX do we need to worry about database owner? */
+
+               /* else add it to the output array */
+               if (newarray)
+               {
+                       newarray = array_set(newarray, 1, &index,
+                                                                d,
+                                                                false,
+                                                                -1 /* varlenarray */ ,
+                                                                -1 /* TEXT's typlen */ ,
+                                                                false /* TEXT's typbyval */ ,
+                                                                'i' /* TEXT's typalign */ );
+               }
+               else
+                       newarray = construct_array(&d, 1,
+                                                                          TEXTOID,
+                                                                          -1, false, 'i');
+
+               index++;
+               pfree(val);
+       }
+
+       return newarray;
+}
+
 
 /*
  * assign_hook subroutines

diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index d20dc67d09eff9e46890323bb4f2c7eac9a6b193..6b100b725546d33b3fcf3af4bc13963801f6cf70 100644 (file)
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -7,7 +7,7 @@
  * Copyright (c) 2000-2006, PostgreSQL Global Development Group
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
- * $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.76.2.1 2009/12/09 21:58:30 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.76.2.2 2010/03/25 14:45:21 alvherre Exp $
  *--------------------------------------------------------------------
  */
 #ifndef GUC_H
@@ -209,6 +209,7 @@ extern char *flatten_set_variable_args(const char *name, List *args);
 extern void ProcessGUCArray(ArrayType *array, GucSource source);
 extern ArrayType *GUCArrayAdd(ArrayType *array, const char *name, const char *value);
 extern ArrayType *GUCArrayDelete(ArrayType *array, const char *name);
+extern ArrayType *GUCArrayReset(ArrayType *array);
 
 extern void pg_timezone_abbrev_initialize(void);