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| 1 /* | |
| 2 ** 2003 January 11 | |
| 3 ** | |
| 4 ** The author disclaims copyright to this source code. In place of | |
| 5 ** a legal notice, here is a blessing: | |
| 6 ** | |
| 7 ** May you do good and not evil. | |
| 8 ** May you find forgiveness for yourself and forgive others. | |
| 9 ** May you share freely, never taking more than you give. | |
| 10 ** | |
| 11 ************************************************************************* | |
| 12 ** This file contains code used to implement the sqlite3_set_authorizer() | |
| 13 ** API. This facility is an optional feature of the library. Embedded | |
| 14 ** systems that do not need this facility may omit it by recompiling | |
| 15 ** the library with -DSQLITE_OMIT_AUTHORIZATION=1 | |
| 16 */ | |
| 17 #include "sqliteInt.h" | |
| 18 | |
| 19 /* | |
| 20 ** All of the code in this file may be omitted by defining a single | |
| 21 ** macro. | |
| 22 */ | |
| 23 #ifndef SQLITE_OMIT_AUTHORIZATION | |
| 24 | |
| 25 /* | |
| 26 ** Set or clear the access authorization function. | |
| 27 ** | |
| 28 ** The access authorization function is be called during the compilation | |
| 29 ** phase to verify that the user has read and/or write access permission on | |
| 30 ** various fields of the database. The first argument to the auth function | |
| 31 ** is a copy of the 3rd argument to this routine. The second argument | |
| 32 ** to the auth function is one of these constants: | |
| 33 ** | |
| 34 ** SQLITE_CREATE_INDEX | |
| 35 ** SQLITE_CREATE_TABLE | |
| 36 ** SQLITE_CREATE_TEMP_INDEX | |
| 37 ** SQLITE_CREATE_TEMP_TABLE | |
| 38 ** SQLITE_CREATE_TEMP_TRIGGER | |
| 39 ** SQLITE_CREATE_TEMP_VIEW | |
| 40 ** SQLITE_CREATE_TRIGGER | |
| 41 ** SQLITE_CREATE_VIEW | |
| 42 ** SQLITE_DELETE | |
| 43 ** SQLITE_DROP_INDEX | |
| 44 ** SQLITE_DROP_TABLE | |
| 45 ** SQLITE_DROP_TEMP_INDEX | |
| 46 ** SQLITE_DROP_TEMP_TABLE | |
| 47 ** SQLITE_DROP_TEMP_TRIGGER | |
| 48 ** SQLITE_DROP_TEMP_VIEW | |
| 49 ** SQLITE_DROP_TRIGGER | |
| 50 ** SQLITE_DROP_VIEW | |
| 51 ** SQLITE_INSERT | |
| 52 ** SQLITE_PRAGMA | |
| 53 ** SQLITE_READ | |
| 54 ** SQLITE_SELECT | |
| 55 ** SQLITE_TRANSACTION | |
| 56 ** SQLITE_UPDATE | |
| 57 ** | |
| 58 ** The third and fourth arguments to the auth function are the name of | |
| 59 ** the table and the column that are being accessed. The auth function | |
| 60 ** should return either SQLITE_OK, SQLITE_DENY, or SQLITE_IGNORE. If | |
| 61 ** SQLITE_OK is returned, it means that access is allowed. SQLITE_DENY | |
| 62 ** means that the SQL statement will never-run - the sqlite3_exec() call | |
| 63 ** will return with an error. SQLITE_IGNORE means that the SQL statement | |
| 64 ** should run but attempts to read the specified column will return NULL | |
| 65 ** and attempts to write the column will be ignored. | |
| 66 ** | |
| 67 ** Setting the auth function to NULL disables this hook. The default | |
| 68 ** setting of the auth function is NULL. | |
| 69 */ | |
| 70 int sqlite3_set_authorizer( | |
| 71 sqlite3 *db, | |
| 72 int (*xAuth)(void*,int,const char*,const char*,const char*,const char*), | |
| 73 void *pArg | |
| 74 ){ | |
| 75 sqlite3_mutex_enter(db->mutex); | |
| 76 db->xAuth = (sqlite3_xauth)xAuth; | |
| 77 db->pAuthArg = pArg; | |
| 78 sqlite3ExpirePreparedStatements(db); | |
| 79 sqlite3_mutex_leave(db->mutex); | |
| 80 return SQLITE_OK; | |
| 81 } | |
| 82 | |
| 83 /* | |
| 84 ** Write an error message into pParse->zErrMsg that explains that the | |
| 85 ** user-supplied authorization function returned an illegal value. | |
| 86 */ | |
| 87 static void sqliteAuthBadReturnCode(Parse *pParse){ | |
| 88 sqlite3ErrorMsg(pParse, "authorizer malfunction"); | |
| 89 pParse->rc = SQLITE_ERROR; | |
| 90 } | |
| 91 | |
| 92 /* | |
| 93 ** Invoke the authorization callback for permission to read column zCol from | |
| 94 ** table zTab in database zDb. This function assumes that an authorization | |
| 95 ** callback has been registered (i.e. that sqlite3.xAuth is not NULL). | |
| 96 ** | |
| 97 ** If SQLITE_IGNORE is returned and pExpr is not NULL, then pExpr is changed | |
| 98 ** to an SQL NULL expression. Otherwise, if pExpr is NULL, then SQLITE_IGNORE | |
| 99 ** is treated as SQLITE_DENY. In this case an error is left in pParse. | |
| 100 */ | |
| 101 int sqlite3AuthReadCol( | |
| 102 Parse *pParse, /* The parser context */ | |
| 103 const char *zTab, /* Table name */ | |
| 104 const char *zCol, /* Column name */ | |
| 105 int iDb /* Index of containing database. */ | |
| 106 ){ | |
| 107 sqlite3 *db = pParse->db; /* Database handle */ | |
| 108 char *zDb = db->aDb[iDb].zName; /* Name of attached database */ | |
| 109 int rc; /* Auth callback return code */ | |
| 110 | |
| 111 rc = db->xAuth(db->pAuthArg, SQLITE_READ, zTab,zCol,zDb,pParse->zAuthContext | |
| 112 #ifdef SQLITE_USER_AUTHENTICATION | |
| 113 ,db->auth.zAuthUser | |
| 114 #endif | |
| 115 ); | |
| 116 if( rc==SQLITE_DENY ){ | |
| 117 if( db->nDb>2 || iDb!=0 ){ | |
| 118 sqlite3ErrorMsg(pParse, "access to %s.%s.%s is prohibited",zDb,zTab,zCol); | |
| 119 }else{ | |
| 120 sqlite3ErrorMsg(pParse, "access to %s.%s is prohibited", zTab, zCol); | |
| 121 } | |
| 122 pParse->rc = SQLITE_AUTH; | |
| 123 }else if( rc!=SQLITE_IGNORE && rc!=SQLITE_OK ){ | |
| 124 sqliteAuthBadReturnCode(pParse); | |
| 125 } | |
| 126 return rc; | |
| 127 } | |
| 128 | |
| 129 /* | |
| 130 ** The pExpr should be a TK_COLUMN expression. The table referred to | |
| 131 ** is in pTabList or else it is the NEW or OLD table of a trigger. | |
| 132 ** Check to see if it is OK to read this particular column. | |
| 133 ** | |
| 134 ** If the auth function returns SQLITE_IGNORE, change the TK_COLUMN | |
| 135 ** instruction into a TK_NULL. If the auth function returns SQLITE_DENY, | |
| 136 ** then generate an error. | |
| 137 */ | |
| 138 void sqlite3AuthRead( | |
| 139 Parse *pParse, /* The parser context */ | |
| 140 Expr *pExpr, /* The expression to check authorization on */ | |
| 141 Schema *pSchema, /* The schema of the expression */ | |
| 142 SrcList *pTabList /* All table that pExpr might refer to */ | |
| 143 ){ | |
| 144 sqlite3 *db = pParse->db; | |
| 145 Table *pTab = 0; /* The table being read */ | |
| 146 const char *zCol; /* Name of the column of the table */ | |
| 147 int iSrc; /* Index in pTabList->a[] of table being read */ | |
| 148 int iDb; /* The index of the database the expression refers to */ | |
| 149 int iCol; /* Index of column in table */ | |
| 150 | |
| 151 if( db->xAuth==0 ) return; | |
| 152 iDb = sqlite3SchemaToIndex(pParse->db, pSchema); | |
| 153 if( iDb<0 ){ | |
| 154 /* An attempt to read a column out of a subquery or other | |
| 155 ** temporary table. */ | |
| 156 return; | |
| 157 } | |
| 158 | |
| 159 assert( pExpr->op==TK_COLUMN || pExpr->op==TK_TRIGGER ); | |
| 160 if( pExpr->op==TK_TRIGGER ){ | |
| 161 pTab = pParse->pTriggerTab; | |
| 162 }else{ | |
| 163 assert( pTabList ); | |
| 164 for(iSrc=0; ALWAYS(iSrc<pTabList->nSrc); iSrc++){ | |
| 165 if( pExpr->iTable==pTabList->a[iSrc].iCursor ){ | |
| 166 pTab = pTabList->a[iSrc].pTab; | |
| 167 break; | |
| 168 } | |
| 169 } | |
| 170 } | |
| 171 iCol = pExpr->iColumn; | |
| 172 if( NEVER(pTab==0) ) return; | |
| 173 | |
| 174 if( iCol>=0 ){ | |
| 175 assert( iCol<pTab->nCol ); | |
| 176 zCol = pTab->aCol[iCol].zName; | |
| 177 }else if( pTab->iPKey>=0 ){ | |
| 178 assert( pTab->iPKey<pTab->nCol ); | |
| 179 zCol = pTab->aCol[pTab->iPKey].zName; | |
| 180 }else{ | |
| 181 zCol = "ROWID"; | |
| 182 } | |
| 183 assert( iDb>=0 && iDb<db->nDb ); | |
| 184 if( SQLITE_IGNORE==sqlite3AuthReadCol(pParse, pTab->zName, zCol, iDb) ){ | |
| 185 pExpr->op = TK_NULL; | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 /* | |
| 190 ** Do an authorization check using the code and arguments given. Return | |
| 191 ** either SQLITE_OK (zero) or SQLITE_IGNORE or SQLITE_DENY. If SQLITE_DENY | |
| 192 ** is returned, then the error count and error message in pParse are | |
| 193 ** modified appropriately. | |
| 194 */ | |
| 195 int sqlite3AuthCheck( | |
| 196 Parse *pParse, | |
| 197 int code, | |
| 198 const char *zArg1, | |
| 199 const char *zArg2, | |
| 200 const char *zArg3 | |
| 201 ){ | |
| 202 sqlite3 *db = pParse->db; | |
| 203 int rc; | |
| 204 | |
| 205 /* Don't do any authorization checks if the database is initialising | |
| 206 ** or if the parser is being invoked from within sqlite3_declare_vtab. | |
| 207 */ | |
| 208 if( db->init.busy || IN_DECLARE_VTAB ){ | |
| 209 return SQLITE_OK; | |
| 210 } | |
| 211 | |
| 212 if( db->xAuth==0 ){ | |
| 213 return SQLITE_OK; | |
| 214 } | |
| 215 rc = db->xAuth(db->pAuthArg, code, zArg1, zArg2, zArg3, pParse->zAuthContext | |
| 216 #ifdef SQLITE_USER_AUTHENTICATION | |
| 217 ,db->auth.zAuthUser | |
| 218 #endif | |
| 219 ); | |
| 220 if( rc==SQLITE_DENY ){ | |
| 221 sqlite3ErrorMsg(pParse, "not authorized"); | |
| 222 pParse->rc = SQLITE_AUTH; | |
| 223 }else if( rc!=SQLITE_OK && rc!=SQLITE_IGNORE ){ | |
| 224 rc = SQLITE_DENY; | |
| 225 sqliteAuthBadReturnCode(pParse); | |
| 226 } | |
| 227 return rc; | |
| 228 } | |
| 229 | |
| 230 /* | |
| 231 ** Push an authorization context. After this routine is called, the | |
| 232 ** zArg3 argument to authorization callbacks will be zContext until | |
| 233 ** popped. Or if pParse==0, this routine is a no-op. | |
| 234 */ | |
| 235 void sqlite3AuthContextPush( | |
| 236 Parse *pParse, | |
| 237 AuthContext *pContext, | |
| 238 const char *zContext | |
| 239 ){ | |
| 240 assert( pParse ); | |
| 241 pContext->pParse = pParse; | |
| 242 pContext->zAuthContext = pParse->zAuthContext; | |
| 243 pParse->zAuthContext = zContext; | |
| 244 } | |
| 245 | |
| 246 /* | |
| 247 ** Pop an authorization context that was previously pushed | |
| 248 ** by sqlite3AuthContextPush | |
| 249 */ | |
| 250 void sqlite3AuthContextPop(AuthContext *pContext){ | |
| 251 if( pContext->pParse ){ | |
| 252 pContext->pParse->zAuthContext = pContext->zAuthContext; | |
| 253 pContext->pParse = 0; | |
| 254 } | |
| 255 } | |
| 256 | |
| 257 #endif /* SQLITE_OMIT_AUTHORIZATION */ | |
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Chromium Code Reviews
Issue 2363173002:
[sqlite] Remove obsolete reference version 3.8.7.4. (Closed)
