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Missed a few files from Todd's patch...oops :)
This commit is contained in:
Marc G. Fournier
379
src/backend/commands/user.c
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379
src/backend/commands/user.c
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/*-------------------------------------------------------------------------
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*
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* user.c--
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* use pg_eval to create a new user in the catalog
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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*
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*-------------------------------------------------------------------------
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*/
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#include <stdio.h> /* for sprintf() */
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#include <string.h>
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#include <postgres.h>
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#include <miscadmin.h>
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#include <catalog/catname.h>
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#include <catalog/pg_database.h>
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#include <catalog/pg_user.h>
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#include <libpq/crypt.h>
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#include <access/heapam.h>
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#include <access/xact.h>
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#include <storage/bufmgr.h>
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#include <storage/lmgr.h>
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#include <tcop/tcopprot.h>
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#include <utils/acl.h>
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#include <utils/palloc.h>
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#include <utils/rel.h>
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#include <commands/user.h>
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/*---------------------------------------------------------------------
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* UpdatePgPwdFile
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*
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* copy the modified contents of pg_user to a file used by the postmaster
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* for user authentication. The file is stored as $PGDATA/pg_pwd.
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*---------------------------------------------------------------------
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*/
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static
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void UpdatePgPwdFile(char* sql) {
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char* filename;
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filename = crypt_getpwdfilename();
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sprintf(sql, "copy %s to '%s' using delimiters '#'", UserRelationName, filename);
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pg_eval(sql, (char**)NULL, (Oid*)NULL, 0);
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}
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/*---------------------------------------------------------------------
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* DefineUser
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*
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* Add the user to the pg_user relation, and if specified make sure the
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* user is specified in the desired groups of defined in pg_group.
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*---------------------------------------------------------------------
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*/
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void DefineUser(CreateUserStmt *stmt) {
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char* pg_user;
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Relation pg_user_rel;
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TupleDesc pg_user_dsc;
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HeapScanDesc scan;
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HeapTuple tuple;
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Datum datum;
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Buffer buffer;
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char sql[512];
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char* sql_end;
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bool exists = false,
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n,
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inblock;
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int max_id = -1;
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if (!(inblock = IsTransactionBlock()))
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BeginTransactionBlock();
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/* Make sure the user attempting to create a user can insert into the pg_user
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* relation.
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*/
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pg_user = GetPgUserName();
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if (pg_aclcheck(UserRelationName, pg_user, ACL_RD | ACL_WR | ACL_AP) != ACLCHECK_OK) {
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UserAbortTransactionBlock();
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elog(WARN, "defineUser: user \"%s\" does not have SELECT and INSERT privilege for \"%s\"",
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pg_user, UserRelationName);
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return;
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}
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/* Scan the pg_user relation to be certain the user doesn't already exist.
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*/
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pg_user_rel = heap_openr(UserRelationName);
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pg_user_dsc = RelationGetTupleDescriptor(pg_user_rel);
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/* Secure a write lock on pg_user so we can be sure of what the next usesysid
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* should be.
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*/
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RelationSetLockForWrite(pg_user_rel);
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scan = heap_beginscan(pg_user_rel, false, false, 0, NULL);
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while (HeapTupleIsValid(tuple = heap_getnext(scan, 0, &buffer))) {
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datum = heap_getattr(tuple, buffer, Anum_pg_user_usename, pg_user_dsc, &n);
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if (!exists && !strncmp((char*)datum, stmt->user, strlen(stmt->user)))
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exists = true;
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datum = heap_getattr(tuple, buffer, Anum_pg_user_usesysid, pg_user_dsc, &n);
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if ((int)datum > max_id)
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max_id = (int)datum;
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ReleaseBuffer(buffer);
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}
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heap_endscan(scan);
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if (exists) {
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RelationUnsetLockForWrite(pg_user_rel);
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heap_close(pg_user_rel);
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UserAbortTransactionBlock();
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elog(WARN, "defineUser: user \"%s\" has already been created", stmt->user);
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return;
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}
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/* Build the insert statment to be executed.
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*/
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sprintf(sql, "insert into %s(usename,usesysid,usecreatedb,usetrace,usesuper,usecatupd,passwd", UserRelationName);
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/* if (stmt->password)
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strcat(sql, ",passwd"); -- removed so that insert empty string when no password */
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if (stmt->validUntil)
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strcat(sql, ",valuntil");
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sql_end = sql + strlen(sql);
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sprintf(sql_end, ") values('%s',%d", stmt->user, max_id + 1);
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if (stmt->createdb && *stmt->createdb)
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strcat(sql_end, ",'t','t'");
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else
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strcat(sql_end, ",'f','t'");
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if (stmt->createuser && *stmt->createuser)
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strcat(sql_end, ",'t','t'");
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else
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strcat(sql_end, ",'f','t'");
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sql_end += strlen(sql_end);
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if (stmt->password) {
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sprintf(sql_end, ",'%s'", stmt->password);
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sql_end += strlen(sql_end);
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} else {
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strcpy(sql_end, ",''");
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sql_end += strlen(sql_end);
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}
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if (stmt->validUntil) {
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sprintf(sql_end, ",'%s'", stmt->validUntil);
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sql_end += strlen(sql_end);
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}
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strcat(sql_end, ")");
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pg_eval(sql, (char**)NULL, (Oid*)NULL, 0);
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/* Add the stuff here for groups.
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*/
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RelationUnsetLockForWrite(pg_user_rel);
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heap_close(pg_user_rel);
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UpdatePgPwdFile(sql);
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if (IsTransactionBlock() && !inblock)
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EndTransactionBlock();
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}
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extern void AlterUser(AlterUserStmt *stmt) {
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char* pg_user;
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Relation pg_user_rel;
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TupleDesc pg_user_dsc;
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HeapScanDesc scan;
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HeapTuple tuple;
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Datum datum;
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Buffer buffer;
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char sql[512];
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char* sql_end;
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bool exists = false,
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n,
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inblock;
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int max_id = -1;
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if (!(inblock = IsTransactionBlock()))
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BeginTransactionBlock();
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/* Make sure the user attempting to create a user can insert into the pg_user
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* relation.
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*/
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pg_user = GetPgUserName();
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if (pg_aclcheck(UserRelationName, pg_user, ACL_RD | ACL_WR) != ACLCHECK_OK) {
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UserAbortTransactionBlock();
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elog(WARN, "alterUser: user \"%s\" does not have SELECT and UPDATE privilege for \"%s\"",
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pg_user, UserRelationName);
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return;
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}
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/* Scan the pg_user relation to be certain the user exists.
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*/
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pg_user_rel = heap_openr(UserRelationName);
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pg_user_dsc = RelationGetTupleDescriptor(pg_user_rel);
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scan = heap_beginscan(pg_user_rel, false, false, 0, NULL);
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while (HeapTupleIsValid(tuple = heap_getnext(scan, 0, &buffer))) {
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datum = heap_getattr(tuple, buffer, Anum_pg_user_usename, pg_user_dsc, &n);
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if (!strncmp((char*)datum, stmt->user, strlen(stmt->user))) {
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exists = true;
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ReleaseBuffer(buffer);
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break;
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}
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}
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heap_endscan(scan);
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heap_close(pg_user_rel);
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if (!exists) {
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UserAbortTransactionBlock();
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elog(WARN, "alterUser: user \"%s\" does not exist", stmt->user);
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return;
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}
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/* Create the update statement to modify the user.
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*/
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sprintf(sql, "update %s set", UserRelationName);
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sql_end = sql;
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if (stmt->password) {
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sql_end += strlen(sql_end);
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sprintf(sql_end, " passwd = '%s'", stmt->password);
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}
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if (stmt->createdb) {
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if (sql_end != sql)
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strcat(sql_end, ",");
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sql_end += strlen(sql_end);
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if (*stmt->createdb)
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strcat(sql_end, " usecreatedb = 't'");
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else
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strcat(sql_end, " usecreatedb = 'f'");
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}
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if (stmt->createuser) {
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if (sql_end != sql)
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strcat(sql_end, ",");
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sql_end += strlen(sql_end);
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if (*stmt->createuser)
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strcat(sql_end, " usesuper = 't'");
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else
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strcat(sql_end, " usesuper = 'f'");
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}
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if (stmt->validUntil) {
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if (sql_end != sql)
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strcat(sql_end, ",");
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sql_end += strlen(sql_end);
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sprintf(sql_end, " valuntil = '%s'", stmt->validUntil);
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}
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if (sql_end != sql) {
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sql_end += strlen(sql_end);
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sprintf(sql_end, " where usename = '%s'", stmt->user);
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pg_eval(sql, (char**)NULL, (Oid*)NULL, 0);
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}
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/* do the pg_group stuff here */
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UpdatePgPwdFile(sql);
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if (IsTransactionBlock() && !inblock)
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EndTransactionBlock();
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}
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extern void RemoveUser(char* user) {
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char* pg_user;
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Relation pg_rel;
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TupleDesc pg_dsc;
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HeapScanDesc scan;
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HeapTuple tuple;
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Datum datum;
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Buffer buffer;
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char sql[256];
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bool n,
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inblock;
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int usesysid = -1,
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ndbase = 0;
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char** dbase = NULL;
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if (!(inblock = IsTransactionBlock()))
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BeginTransactionBlock();
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/* Make sure the user attempting to create a user can delete from the pg_user
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* relation.
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*/
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pg_user = GetPgUserName();
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if (pg_aclcheck(UserRelationName, pg_user, ACL_RD | ACL_WR) != ACLCHECK_OK) {
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UserAbortTransactionBlock();
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elog(WARN, "removeUser: user \"%s\" does not have SELECT and DELETE privilege for \"%s\"",
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pg_user, UserRelationName);
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return;
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}
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/* Perform a scan of the pg_user relation to find the usesysid of the user to
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* be deleted. If it is not found, then return a warning message.
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*/
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pg_rel = heap_openr(UserRelationName);
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pg_dsc = RelationGetTupleDescriptor(pg_rel);
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scan = heap_beginscan(pg_rel, false, false, 0, NULL);
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while (HeapTupleIsValid(tuple = heap_getnext(scan, 0, &buffer))) {
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datum = heap_getattr(tuple, buffer, Anum_pg_user_usename, pg_dsc, &n);
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if (!strncmp((char*)datum, user, strlen(user))) {
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usesysid = (int)heap_getattr(tuple, buffer, Anum_pg_user_usesysid, pg_dsc, &n);
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ReleaseBuffer(buffer);
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break;
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}
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ReleaseBuffer(buffer);
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}
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heap_endscan(scan);
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heap_close(pg_rel);
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if (usesysid == -1) {
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UserAbortTransactionBlock();
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elog(WARN, "removeUser: user \"%s\" does not exist", user);
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return;
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}
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/* Perform a scan of the pg_database relation to find the databases owned by
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* usesysid. Then drop them.
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*/
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pg_rel = heap_openr(DatabaseRelationName);
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pg_dsc = RelationGetTupleDescriptor(pg_rel);
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scan = heap_beginscan(pg_rel, false, false, 0, NULL);
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while (HeapTupleIsValid(tuple = heap_getnext(scan, 0, &buffer))) {
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datum = heap_getattr(tuple, buffer, Anum_pg_database_datdba, pg_dsc, &n);
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if ((int)datum == usesysid) {
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datum = heap_getattr(tuple, buffer, Anum_pg_database_datname, pg_dsc, &n);
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if (memcmp((void*)datum, "template1", 9)) {
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dbase = (char**)repalloc((void*)dbase, sizeof(char*) * (ndbase + 1));
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dbase[ndbase] = (char*)palloc(NAMEDATALEN + 1);
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memcpy((void*)dbase[ndbase], (void*)datum, NAMEDATALEN);
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dbase[ndbase++][NAMEDATALEN] = '\0';
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}
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}
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ReleaseBuffer(buffer);
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}
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heap_endscan(scan);
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heap_close(pg_rel);
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while (ndbase--) {
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elog(NOTICE, "Dropping database %s", dbase[ndbase]);
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sprintf(sql, "drop database %s", dbase[ndbase]);
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pfree((void*)dbase[ndbase]);
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pg_eval(sql, (char**)NULL, (Oid*)NULL, 0);
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}
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if (dbase)
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pfree((void*)dbase);
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/* Since pg_user is global over all databases, one of two things must be done
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* to insure complete consistency. First, pg_user could be made non-global.
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* This would elminate the code above for deleting database and would require
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* the addition of code to delete tables, views, etc owned by the user.
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*
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* The second option would be to create a means of deleting tables, view,
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* etc. owned by the user from other databases. Pg_user is global and so
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* this must be done at some point.
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*
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* Let us not forget that the user should be removed from the pg_groups also.
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*
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* Todd A. Brandys 11/18/1997
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*
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*/
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/* Remove the user from the pg_user table
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*/
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sprintf(sql, "delete from %s where usename = '%s'", UserRelationName, user);
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pg_eval(sql, (char**)NULL, (Oid*)NULL, 0);
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UpdatePgPwdFile(sql);
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if (IsTransactionBlock() && !inblock)
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EndTransactionBlock();
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}
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