├── .gitignore ├── LICENSE ├── Makefile ├── README.md ├── pg_savior--0.0.1.sql ├── pg_savior.c ├── pg_savior.control ├── rules ├── RD001.md ├── RD002.md └── RD003.md └── tests ├── RD001.yml ├── RD002.yml └── RD003.yml /.gitignore: -------------------------------------------------------------------------------- 1 | *.so 2 | *.o 3 | *.dylib 4 | regression.diffs 5 | regression.out 6 | .idea/ 7 | .vscode/ 8 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | MODULES = pg_savior 2 | EXTENSION = pg_savior 3 | DATA = pg_savior--0.0.1.sql 4 | 5 | PG_CONFIG = pg_config 6 | PGXS := $(shell $(PG_CONFIG) --pgxs) 7 | include $(PGXS) -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # pg_savior 2 | 3 | pg_savior is a PostgreSQL extension designed to prevent accidental data loss due to non-parameterized DELETE queries without a WHERE clause. It hooks into the query execution path. 4 | 5 | ## Warning 6 | 7 | The extension is currently under active development. This project is not ready for production yet. 8 | 9 | ## Features 10 | - [x] Detect DELETE queries without a WHERE clause 11 | - [x] Detect DELETE queries which use index scan 12 | - [x] Detects DELETE queries which uses CTE & subqueries 13 | - [ ] Prevent CREATE INDEX without concurrently 14 | - [ ] Prevent DROP DATABASE command 15 | 16 | ## Installation 17 | 18 | 1. Clone the repository. 19 | 2. Navigate to the repository directory. 20 | 3. Run `make` to build the extension. 21 | 4. Run `sudo make install` to install the extension. 22 | 23 | ## Demo 24 | 25 | ``` 26 | $ psql -U visi -d postgres psql 27 | (14.9 (Homebrew)) 28 | Type "help" for help. 29 | 30 | postgres=# 31 | postgres=# create extension pg_savior; 32 | CREATE EXTENSION 33 | 34 | postgres=# select * from emp; 35 | id 36 | ---- 37 | (0 rows) 38 | 39 | postgres=# insert into emp values(1); 40 | INSERT 0 1 41 | 42 | postgres=# delete from emp; 43 | INFO: pg_savior: DELETE statement detected 44 | INFO: pg_savior: WHERE clause is mandatory for a DELETE statement 45 | DELETE 0 46 | 47 | postgres=# select * from emp; 48 | id 49 | ---- 50 | 1 51 | (1 row) 52 | ``` 53 | 54 | ## Usage 55 | 56 | After installing the extension, you can enable it in your PostgreSQL database with the following command: 57 | 58 | ```sql 59 | CREATE EXTENSION pg_savior; 60 | ``` 61 | 62 | ## Test 63 | 64 | The test suite of pg_savior uses [pg_yregres](https://github.com/omnigres/omnigres/tree/master/pg_yregress). To run a specific test, 65 | 66 | ``` 67 | pg_yregress tests/D0001.yml 68 | TAP version 14 69 | 1..4 70 | # Initializing instances 71 | # Subtest: initialize instance `default` 72 | 1..2 73 | ok 1 - create extension pg_savior 74 | ok 2 - create table emp ( id int ) 75 | ok 1 - initialize instance `default` 76 | INFO: pg_savior: ExecutorStart_hook called 77 | INFO: pg_savior: ExecutorStart called 78 | INFO: pg_savior: queryDesc->sourceText: select oid, typname from pg_type 79 | # Done initializing instances 80 | ok 2 - D0001: pg_savior: Check if pg_savior is installed 81 | # Subtest: D0001: pg_savior: delete without where clause 82 | 1..6 83 | ok 1 - insert into emp values (1) 84 | ok 2 - insert into emp values (2) 85 | ok 3 - insert into emp values (3) 86 | ok 4 - select count(*) from emp as count 87 | ok 5 - delete from emp 88 | ok 6 - select count(*) from emp as count 89 | ok 3 - D0001: pg_savior: delete without where clause 90 | ``` -------------------------------------------------------------------------------- /pg_savior--0.0.1.sql: -------------------------------------------------------------------------------- 1 | create table saved_queries 2 | ( 3 | id serial primary key, 4 | query text not null, 5 | executed_at timestamp not null default now() 6 | ); 7 | 8 | CREATE OR REPLACE FUNCTION 9 | show_saved() RETURNS table 10 | ( 11 | id integer, 12 | query text, 13 | executed_at timestamp 14 | ) AS 'MODULE_PATHNAME','show_saved' 15 | LANGUAGE C STRICT; -------------------------------------------------------------------------------- /pg_savior.c: -------------------------------------------------------------------------------- 1 | // clang-format off 2 | #include 3 | #include 4 | // clang-format on 5 | #include "executor/spi.h" 6 | #include "executor/tstoreReceiver.h" 7 | #include "funcapi.h" 8 | #include "nodes/nodes.h" 9 | #include "utils/builtins.h" 10 | #include 11 | 12 | static ExecutorRun_hook_type ExecutorRun_old_hook = NULL; 13 | 14 | // insert the query into the saved_queries table 15 | static void insert_meta(QueryDesc *qd) { 16 | SPIPlanPtr plan; 17 | Datum values[1]; 18 | char nulls[1] = {' '}; 19 | 20 | values[0] = CStringGetTextDatum(qd->sourceText); 21 | 22 | if (SPI_connect() != SPI_OK_CONNECT) 23 | elog(ERROR, "SPI_connect failed"); 24 | 25 | plan = SPI_prepare("INSERT INTO saved_queries (query) VALUES ($1)", 1, 26 | (Oid[1]){TEXTOID}); 27 | if (plan == NULL) 28 | elog(ERROR, "SPI_prepare failed: %s", SPI_result_code_string(SPI_result)); 29 | 30 | SPI_execute_plan(plan, values, nulls, false, 0); 31 | SPI_finish(); 32 | } 33 | 34 | bool walkPlanTree(Plan *plan); 35 | 36 | static bool ensureWhereClause(QueryDesc *queryDesc) { 37 | Plan *plan = queryDesc->plannedstmt->planTree; 38 | if (queryDesc->params != NULL) { 39 | // non parameterized DELETE statement detected 40 | // char *s = nodeToString(plan); 41 | // elog(INFO, "pg_savior: planTree: %s", s); 42 | return true; 43 | } 44 | 45 | return walkPlanTree(plan); 46 | } 47 | 48 | // walk the plan tree to find if there is a WHERE clause 49 | bool walkPlanTree(Plan *plan) { 50 | bool hasWhereClause = false; 51 | if (plan == NULL) { 52 | return false; 53 | } 54 | if (plan->qual != NULL) { 55 | if (plan->qual->type == T_List) { 56 | ListCell *cell; 57 | foreach (cell, plan->qual) { 58 | Node *node = lfirst(cell); 59 | // We are checking operation expression 60 | if (node->type == T_OpExpr) { 61 | return true; 62 | } 63 | } 64 | } 65 | } 66 | // subquery and CTE's creates hash join 67 | if (plan->type == T_HashJoin) { 68 | HashJoin *hashJoin = (HashJoin *)plan; 69 | if (hashJoin->hashclauses != NULL) { 70 | return true; 71 | } 72 | } 73 | 74 | // queries which uses index scan 75 | if (plan->type == T_IndexScan) { 76 | IndexScan *indexScan = (IndexScan *)plan; 77 | if (indexScan->indexqual != NULL) { 78 | return true; 79 | } 80 | } 81 | 82 | if (plan->lefttree != NULL) { 83 | hasWhereClause = walkPlanTree(plan->lefttree); 84 | if (hasWhereClause) { 85 | return true; 86 | } 87 | } 88 | if (plan->righttree != NULL) { 89 | hasWhereClause = walkPlanTree(plan->righttree); 90 | if (hasWhereClause) { 91 | return true; 92 | } 93 | } 94 | return hasWhereClause; 95 | } 96 | 97 | static void ExecutorRun_hook_savior(QueryDesc *queryDesc, 98 | ScanDirection direction, uint64 count, 99 | bool execute_once) { 100 | if (ExecutorRun_old_hook) 101 | ExecutorRun_old_hook(queryDesc, direction, count, execute_once); 102 | else 103 | switch (queryDesc->operation) { 104 | case CMD_DELETE: 105 | elog(INFO, "pg_savior: DELETE statement detected"); 106 | if (ensureWhereClause(queryDesc)) { 107 | standard_ExecutorRun(queryDesc, direction, count, execute_once); 108 | } else { 109 | elog(INFO, "pg_savior: WHERE clause is mandatory for a DELETE statement"); 110 | insert_meta(queryDesc); 111 | } 112 | break; 113 | case CMD_UPDATE: 114 | if (ensureWhereClause(queryDesc)) { 115 | standard_ExecutorRun(queryDesc, direction, count, execute_once); 116 | } else { 117 | elog(INFO, "pg_savior: WHERE clause is mandatory for an UPDATE statement"); 118 | insert_meta(queryDesc); 119 | } 120 | break; 121 | default: 122 | standard_ExecutorRun(queryDesc, direction, count, execute_once); 123 | } 124 | } 125 | 126 | void _PG_init(void); 127 | 128 | void _PG_init() { 129 | ExecutorRun_old_hook = ExecutorRun_hook; 130 | ExecutorRun_hook = ExecutorRun_hook_savior; 131 | } 132 | 133 | PG_MODULE_MAGIC; 134 | 135 | PG_FUNCTION_INFO_V1(show_saved); 136 | 137 | // this function is used to show the saved queries 138 | // it's just a wrapper around select * from saved_queries 139 | Datum show_saved(PG_FUNCTION_ARGS) { 140 | int ret; 141 | TupleDesc tupdesc; 142 | Tuplestorestate *tupstore; 143 | MemoryContext oldcontext; 144 | ReturnSetInfo *rsinfo = (ReturnSetInfo *)fcinfo->resultinfo; 145 | 146 | SPI_connect(); 147 | 148 | ret = SPI_execute("SELECT * FROM saved_queries", true, 0); 149 | 150 | if (ret != SPI_OK_SELECT) 151 | elog(ERROR, "SPI_execute failed: error code %d", ret); 152 | 153 | /* Switch to long-lived context to build tuplestore in */ 154 | oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory); 155 | 156 | /* Build a tuple descriptor for our result type */ 157 | if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) 158 | elog(ERROR, "return type must be a row type"); 159 | 160 | tupstore = tuplestore_begin_heap(true, false, work_mem); 161 | 162 | /* Put tuples into tuplestore */ 163 | for (int i = 0; i < SPI_processed; i++) { 164 | HeapTuple tuple; 165 | tuple = SPI_copytuple(SPI_tuptable->vals[i]); 166 | tuplestore_puttuple(tupstore, tuple); 167 | } 168 | 169 | /* Clean up and return the tuplestore */ 170 | SPI_finish(); 171 | tuplestore_donestoring(tupstore); 172 | 173 | MemoryContextSwitchTo(oldcontext); 174 | 175 | rsinfo->returnMode = SFRM_Materialize; 176 | rsinfo->setResult = tupstore; 177 | rsinfo->setDesc = tupdesc; 178 | 179 | PG_RETURN_NULL(); 180 | } 181 | -------------------------------------------------------------------------------- /pg_savior.control: -------------------------------------------------------------------------------- 1 | comment = 'Postgres extension to save OOPS mistakes' 2 | default_version = '0.0.1' 3 | relocatable = true 4 | module_pathname = '$libdir/pg_savior' -------------------------------------------------------------------------------- /rules/RD001.md: -------------------------------------------------------------------------------- 1 | | Rule | Name | Example | 2 | | ----- | -------------- | --------------- | 3 | | D0001 | Vanilla Delete | Delete from emp | 4 | 5 | ### Rule Description 6 | 7 | -------------------------------------------------------------------------------- /rules/RD002.md: -------------------------------------------------------------------------------- 1 | | Rule | Name | Example | 2 | | ----- | -------------------- | --------------- | 3 | | D0001 | Delete with subquery | Delete from emp | 4 | 5 | ### Rule Description -------------------------------------------------------------------------------- /rules/RD003.md: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/viggy28/pg_savior/0b85ec4a9fa43a7f31cf95b926d74777258dde09/rules/RD003.md -------------------------------------------------------------------------------- /tests/RD001.yml: -------------------------------------------------------------------------------- 1 | $schema: "https://raw.githubusercontent.com/omnigres/omnigres/master/pg_yregress/schema.json" 2 | instance: 3 | init: 4 | - create extension pg_savior 5 | - create table emp 6 | ( 7 | id int 8 | ) 9 | tests: 10 | - name: "RD0001: pg_savior: Check if pg_savior is installed" 11 | query: "select count(*) from pg_extension where extname = 'pg_savior'" 12 | expected: "1" 13 | 14 | - name: "RD0001: pg_savior: delete without where clause" 15 | steps: 16 | - query: "insert into emp values (1)" 17 | - query: "insert into emp values (2)" 18 | - query: "insert into emp values (3)" 19 | - query: "select count(*) from emp as count" 20 | results: 21 | - count: 3 22 | - query: "delete from emp" 23 | - query: "select count(*) from emp as count" 24 | results: 25 | - count: 3 26 | -------------------------------------------------------------------------------- /tests/RD002.yml: -------------------------------------------------------------------------------- 1 | $schema: "https://raw.githubusercontent.com/omnigres/omnigres/master/pg_yregress/schema.json" 2 | instance: 3 | init: 4 | - create extension pg_savior 5 | - create table emp 6 | ( 7 | id int 8 | ) 9 | - create table dept 10 | ( 11 | id int 12 | ) 13 | tests: 14 | - name: "RD002: pg_savior: Check if pg_savior is installed" 15 | query: "select count(*) from pg_extension where extname = 'pg_savior'" 16 | expected: "1" 17 | 18 | - name: "RD002: pg_savior: delete with where clause using subquery" 19 | steps: 20 | - query: "insert into emp (SELECT * FROM generate_series(1, 10000))" 21 | - query: "insert into dept (SELECT * FROM generate_series(1, 100))" 22 | - query: "select count(*) from emp as count" 23 | results: 24 | - count: 10000 25 | - query: "delete from emp where id in (select id from dept)" 26 | - query: "select count(*) from emp as count" 27 | results: 28 | - count: 9900 29 | -------------------------------------------------------------------------------- /tests/RD003.yml: -------------------------------------------------------------------------------- 1 | $schema: "https://raw.githubusercontent.com/omnigres/omnigres/master/pg_yregress/schema.json" 2 | instance: 3 | init: 4 | - create extension pg_savior 5 | - create table emp 6 | ( 7 | id int 8 | ) 9 | tests: 10 | - name: "RD0003: pg_savior: update with where clause is applied" 11 | steps: 12 | - query: "insert into emp values (1)" 13 | - query: "insert into emp values (2)" 14 | - query: "select count(*) as count from emp where id=1" 15 | results: 16 | - count: 1 17 | - query: "select count(*) as count from emp where id=10" 18 | results: 19 | - count: 0 20 | 21 | - query: "update emp set id=10 where id = 1" 22 | - query: "select count(*) as count from emp where id=1" 23 | results: 24 | - count: 0 25 | - query: "select count(*) as count from emp where id=10" 26 | results: 27 | - count: 1 28 | 29 | - name: "RD0003: pg_savior: update without where clause is not applied" 30 | steps: 31 | - query: "insert into emp values (1)" 32 | - query: "insert into emp values (2)" 33 | - query: "select count(*) as count from emp where id=1" 34 | results: 35 | - count: 1 36 | - query: "select count(*) as count from emp where id=10" 37 | results: 38 | - count: 0 39 | 40 | - query: "update emp set id=10" 41 | - query: "select count(*) as count from emp where id=1" 42 | results: 43 | - count: 1 44 | - query: "select count(*) as count from emp where id=10" 45 | results: 46 | - count: 0 47 | - query: "select query from saved_queries order by id desc limit 1" 48 | results: 49 | - query: "update emp set id=10" --------------------------------------------------------------------------------