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153 lines
4.8 KiB
C
153 lines
4.8 KiB
C
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/*
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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 sqlite_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
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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_READ_COLUMN
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** SQLITE_WRITE_COLUMN
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** SQLITE_DELETE_ROW
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** SQLITE_INSERT_ROW
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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 sqlite_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 sqlite_set_authorizer(
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sqlite *db,
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int (*xAuth)(void*,int,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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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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char zBuf[20];
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sprintf(zBuf, "(%d)", rc);
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sqliteSetString(&pParse->zErrMsg, "illegal return value ", zBuf,
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" from the authorization function - should be SQLITE_OK, "
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"SQLITE_IGNORE, or SQLITE_DENY", 0);
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pParse->nErr++;
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pParse->rc = SQLITE_MISUSE;
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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 with an offset of base. Check to see if it is OK to read
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** 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 sqliteAuthRead(
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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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int base /* Offset of pTabList relative to pExpr */
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){
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sqlite *db = pParse->db;
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int rc;
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Table *pTab;
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const char *zCol;
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if( db->xAuth==0 ) return;
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assert( pExpr->op==TK_COLUMN );
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assert( pExpr->iTable>=base && pExpr->iTable<base+pTabList->nSrc );
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pTab = pTabList->a[pExpr->iTable-base].pTab;
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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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rc = db->xAuth(db->pAuthArg, SQLITE_READ, pTab->zName, zCol);
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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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sqliteSetString(&pParse->zErrMsg,"access to ",
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pTab->zName, ".", zCol, " is prohibited", 0);
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pParse->nErr++;
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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 sqliteAuthCheck(
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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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){
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sqlite *db = pParse->db;
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int rc;
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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);
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if( rc==SQLITE_DENY ){
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sqliteSetString(&pParse->zErrMsg, "not authorized", 0);
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pParse->rc = SQLITE_AUTH;
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pParse->nErr++;
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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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#endif /* SQLITE_OMIT_AUTHORIZATION */
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