233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/*
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** 2003 January 11
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file contains code used to implement the sqlite3_set_authorizer()
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** API. This facility is an optional feature of the library. Embedded
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** systems that do not need this facility may omit it by recompiling
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** the library with -DSQLITE_OMIT_AUTHORIZATION=1
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**
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** $Id$
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*/
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#include "sqliteInt.h"
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/*
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** All of the code in this file may be omitted by defining a single
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** macro.
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*/
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#ifndef SQLITE_OMIT_AUTHORIZATION
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/*
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** Set or clear the access authorization function.
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**
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** The access authorization function is be called during the compilation
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** phase to verify that the user has read and/or write access permission on
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** various fields of the database. The first argument to the auth function
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** is a copy of the 3rd argument to this routine. The second argument
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** to the auth function is one of these constants:
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**
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** SQLITE_CREATE_INDEX
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** SQLITE_CREATE_TABLE
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** SQLITE_CREATE_TEMP_INDEX
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** SQLITE_CREATE_TEMP_TABLE
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** SQLITE_CREATE_TEMP_TRIGGER
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** SQLITE_CREATE_TEMP_VIEW
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** SQLITE_CREATE_TRIGGER
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** SQLITE_CREATE_VIEW
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** SQLITE_DELETE
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** SQLITE_DROP_INDEX
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** SQLITE_DROP_TABLE
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** SQLITE_DROP_TEMP_INDEX
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** SQLITE_DROP_TEMP_TABLE
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** SQLITE_DROP_TEMP_TRIGGER
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** SQLITE_DROP_TEMP_VIEW
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** SQLITE_DROP_TRIGGER
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** SQLITE_DROP_VIEW
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** SQLITE_INSERT
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** SQLITE_PRAGMA
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** SQLITE_READ
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** SQLITE_SELECT
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** SQLITE_TRANSACTION
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** SQLITE_UPDATE
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**
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** The third and fourth arguments to the auth function are the name of
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** the table and the column that are being accessed. The auth function
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** should return either SQLITE_OK, SQLITE_DENY, or SQLITE_IGNORE. If
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** SQLITE_OK is returned, it means that access is allowed. SQLITE_DENY
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** means that the SQL statement will never-run - the sqlite3_exec() call
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** will return with an error. SQLITE_IGNORE means that the SQL statement
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** should run but attempts to read the specified column will return NULL
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** and attempts to write the column will be ignored.
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**
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** Setting the auth function to NULL disables this hook. The default
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** setting of the auth function is NULL.
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*/
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int sqlite3_set_authorizer(
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sqlite3 *db,
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int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
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void *pArg
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){
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db->xAuth = xAuth;
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db->pAuthArg = pArg;
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sqlite3ExpirePreparedStatements(db);
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return SQLITE_OK;
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}
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/*
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** Write an error message into pParse->zErrMsg that explains that the
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** user-supplied authorization function returned an illegal value.
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*/
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static void sqliteAuthBadReturnCode(Parse *pParse, int rc){
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sqlite3ErrorMsg(pParse, "illegal return value (%d) from the "
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"authorization function - should be SQLITE_OK, SQLITE_IGNORE, "
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"or SQLITE_DENY", rc);
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pParse->rc = SQLITE_ERROR;
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}
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/*
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** The pExpr should be a TK_COLUMN expression. The table referred to
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** is in pTabList or else it is the NEW or OLD table of a trigger.
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** Check to see if it is OK to read this particular column.
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**
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** If the auth function returns SQLITE_IGNORE, change the TK_COLUMN
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** instruction into a TK_NULL. If the auth function returns SQLITE_DENY,
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** then generate an error.
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*/
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void sqlite3AuthRead(
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Parse *pParse, /* The parser context */
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Expr *pExpr, /* The expression to check authorization on */
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SrcList *pTabList /* All table that pExpr might refer to */
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){
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sqlite3 *db = pParse->db;
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int rc;
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Table *pTab; /* The table being read */
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const char *zCol; /* Name of the column of the table */
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int iSrc; /* Index in pTabList->a[] of table being read */
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const char *zDBase; /* Name of database being accessed */
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TriggerStack *pStack; /* The stack of current triggers */
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int iDb; /* The index of the database the expression refers to */
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if( db->xAuth==0 ) return;
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if( pExpr->op==TK_AS ) return;
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assert( pExpr->op==TK_COLUMN );
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iDb = sqlite3SchemaToIndex(pParse->db, pExpr->pSchema);
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if( iDb<0 ){
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/* An attempt to read a column out of a subquery or other
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** temporary table. */
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return;
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}
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for(iSrc=0; pTabList && iSrc<pTabList->nSrc; iSrc++){
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if( pExpr->iTable==pTabList->a[iSrc].iCursor ) break;
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}
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if( iSrc>=0 && pTabList && iSrc<pTabList->nSrc ){
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pTab = pTabList->a[iSrc].pTab;
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}else if( (pStack = pParse->trigStack)!=0 ){
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/* This must be an attempt to read the NEW or OLD pseudo-tables
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** of a trigger.
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*/
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assert( pExpr->iTable==pStack->newIdx || pExpr->iTable==pStack->oldIdx );
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pTab = pStack->pTab;
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}else{
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return;
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}
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if( pTab==0 ) return;
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if( pExpr->iColumn>=0 ){
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assert( pExpr->iColumn<pTab->nCol );
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zCol = pTab->aCol[pExpr->iColumn].zName;
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}else if( pTab->iPKey>=0 ){
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assert( pTab->iPKey<pTab->nCol );
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zCol = pTab->aCol[pTab->iPKey].zName;
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}else{
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zCol = "ROWID";
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}
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assert( iDb>=0 && iDb<db->nDb );
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zDBase = db->aDb[iDb].zName;
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rc = db->xAuth(db->pAuthArg, SQLITE_READ, pTab->zName, zCol, zDBase,
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pParse->zAuthContext);
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if( rc==SQLITE_IGNORE ){
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pExpr->op = TK_NULL;
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}else if( rc==SQLITE_DENY ){
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if( db->nDb>2 || iDb!=0 ){
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sqlite3ErrorMsg(pParse, "access to %s.%s.%s is prohibited",
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zDBase, pTab->zName, zCol);
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}else{
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sqlite3ErrorMsg(pParse, "access to %s.%s is prohibited",pTab->zName,zCol);
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}
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pParse->rc = SQLITE_AUTH;
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}else if( rc!=SQLITE_OK ){
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sqliteAuthBadReturnCode(pParse, rc);
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}
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}
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/*
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** Do an authorization check using the code and arguments given. Return
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** either SQLITE_OK (zero) or SQLITE_IGNORE or SQLITE_DENY. If SQLITE_DENY
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** is returned, then the error count and error message in pParse are
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** modified appropriately.
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*/
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int sqlite3AuthCheck(
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Parse *pParse,
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int code,
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const char *zArg1,
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const char *zArg2,
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const char *zArg3
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){
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sqlite3 *db = pParse->db;
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int rc;
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/* Don't do any authorization checks if the database is initialising. */
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if( db->init.busy ){
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return SQLITE_OK;
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}
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if( db->xAuth==0 ){
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return SQLITE_OK;
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}
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rc = db->xAuth(db->pAuthArg, code, zArg1, zArg2, zArg3, pParse->zAuthContext);
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if( rc==SQLITE_DENY ){
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sqlite3ErrorMsg(pParse, "not authorized");
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pParse->rc = SQLITE_AUTH;
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}else if( rc!=SQLITE_OK && rc!=SQLITE_IGNORE ){
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rc = SQLITE_DENY;
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sqliteAuthBadReturnCode(pParse, rc);
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}
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return rc;
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}
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/*
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** Push an authorization context. After this routine is called, the
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** zArg3 argument to authorization callbacks will be zContext until
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** popped. Or if pParse==0, this routine is a no-op.
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*/
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void sqlite3AuthContextPush(
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Parse *pParse,
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AuthContext *pContext,
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const char *zContext
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){
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pContext->pParse = pParse;
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if( pParse ){
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pContext->zAuthContext = pParse->zAuthContext;
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pParse->zAuthContext = zContext;
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}
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}
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/*
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** Pop an authorization context that was previously pushed
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** by sqlite3AuthContextPush
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*/
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void sqlite3AuthContextPop(AuthContext *pContext){
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if( pContext->pParse ){
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pContext->pParse->zAuthContext = pContext->zAuthContext;
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pContext->pParse = 0;
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}
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}
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#endif /* SQLITE_OMIT_AUTHORIZATION */
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