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CWE-089 Add Sequel SQL Injection Sink
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‎ruby/ql/lib/change-notes/2023-05-07-sequel.md

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---
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category: minorAnalysis
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---
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* Support for the `sequel` gem has been added. Method calls that execute queries against a database that may be vulnerable to injection attacks will now be recognized.

‎ruby/ql/lib/codeql/ruby/Frameworks.qll

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@@ -32,3 +32,4 @@ private import codeql.ruby.frameworks.Slim
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private import codeql.ruby.frameworks.Sinatra
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private import codeql.ruby.frameworks.Twirp
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private import codeql.ruby.frameworks.Sqlite3
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private import codeql.ruby.frameworks.Sequel

‎ruby/ql/lib/codeql/ruby/frameworks/Sequel.qll

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/**
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* Provides modeling for `Sequel`, the database toolkit for Ruby.
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* https://github.com/jeremyevans/sequel
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*/
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private import ruby
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private import codeql.ruby.ApiGraphs
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private import codeql.ruby.dataflow.FlowSummary
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private import codeql.ruby.Concepts
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/**
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* Provides modeling for `Sequel`, the database toolkit for Ruby.
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* https://github.com/jeremyevans/sequel
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*/
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module Sequel {
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/** Flow Summary for `Sequel`. */
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private class SqlSummary extends SummarizedCallable {
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SqlSummary() { this = "Sequel.connect" }
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override MethodCall getACall() { result = any(SequelConnection c).asExpr().getExpr() }
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override predicate propagatesFlowExt(string input, string output, boolean preservesValue) {
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input = "Argument[0]" and output = "ReturnValue" and preservesValue = false
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}
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}
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/** A call to establish a connection to a database */
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private class SequelConnection extends DataFlow::CallNode {
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SequelConnection() {
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this =
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API::getTopLevelMember("Sequel").getAMethodCall(["connect", "sqlite", "mysql2", "jdbc"])
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}
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}
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/** A call that constructs SQL statements */
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private class SequelConstruction extends SqlConstruction::Range, DataFlow::CallNode {
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DataFlow::Node query;
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SequelConstruction() {
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this = API::getTopLevelMember("Sequel").getAMethodCall("cast") and query = this.getArgument(1)
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or
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this = API::getTopLevelMember("Sequel").getAMethodCall("function") and
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query = this.getArgument(0)
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}
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override DataFlow::Node getSql() { result = query }
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}
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/** A call that executes SQL statements against a database */
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private class SequelExecution extends SqlExecution::Range, DataFlow::CallNode {
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SequelExecution() {
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exists(SequelConnection sequelConnection |
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this =
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sequelConnection
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.getAMethodCall([
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"execute", "execute_ddl", "execute_dui", "execute_insert", "run", "<<", "fetch",
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"fetch_rows", "[]", "log_connection_yield"
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]) or
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this =
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sequelConnection
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.getAMethodCall("dataset")
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.getAMethodCall([
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"with_sql", "with_sql_all", "with_sql_delete", "with_sql_each", "with_sql_first",
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"with_sql_insert", "with_sql_single_value", "with_sql_update"
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])
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)
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}
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override DataFlow::Node getSql() { result = this.getArgument(0) }
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}
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}

‎ruby/ql/test/library-tests/frameworks/sequel/Sequel.expected

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sequelSqlConstruction
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| sequel.rb:63:29:63:49 | call to cast | sequel.rb:63:45:63:48 | name |
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| sequel.rb:66:29:66:49 | call to function | sequel.rb:66:45:66:48 | name |
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sequelSqlExecution
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| sequel.rb:10:9:10:60 | ...[...] | sequel.rb:10:14:10:59 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:13:9:13:64 | call to run | sequel.rb:13:18:13:63 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:16:9:18:11 | call to fetch | sequel.rb:16:20:16:65 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:21:9:21:65 | ...[...] | sequel.rb:21:14:21:64 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:24:9:24:65 | call to execute | sequel.rb:24:22:24:65 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:27:9:27:71 | call to execute_ddl | sequel.rb:27:26:27:71 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:30:9:30:71 | call to execute_dui | sequel.rb:30:26:30:71 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:33:9:33:74 | call to execute_insert | sequel.rb:33:29:33:74 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:36:9:36:62 | ... << ... | sequel.rb:36:17:36:62 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:39:9:39:79 | call to fetch_rows | sequel.rb:39:25:39:70 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:42:9:42:81 | call to with_sql_all | sequel.rb:42:35:42:80 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:45:9:45:84 | call to with_sql_delete | sequel.rb:45:38:45:83 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:48:9:48:90 | call to with_sql_each | sequel.rb:48:36:48:81 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:51:9:51:83 | call to with_sql_first | sequel.rb:51:37:51:82 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:54:9:54:84 | call to with_sql_insert | sequel.rb:54:38:54:83 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:57:9:57:90 | call to with_sql_single_value | sequel.rb:57:44:57:89 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:60:9:60:84 | call to with_sql_update | sequel.rb:60:38:60:83 | "SELECT * FROM users WHERE use..." |
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| sequel.rb:63:9:63:20 | ...[...] | sequel.rb:63:14:63:19 | :table |
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| sequel.rb:66:9:66:20 | ...[...] | sequel.rb:66:14:66:19 | :table |

‎ruby/ql/test/library-tests/frameworks/sequel/Sequel.ql

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private import codeql.ruby.DataFlow
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private import codeql.ruby.Concepts
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private import codeql.ruby.frameworks.Sequel
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query predicate sequelSqlConstruction(SqlConstruction c, DataFlow::Node sql) { sql = c.getSql() }
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query predicate sequelSqlExecution(SqlExecution e, DataFlow::Node sql) { sql = e.getSql() }

‎ruby/ql/test/library-tests/frameworks/sequel/sequel.rb

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require 'sequel'
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class UsersController < ActionController::Base
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def sequel_handler(event:, context:)
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name = params[:name]
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conn = Sequel.sqlite("sqlite://example.db")
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# BAD: SQL statement constructed from user input
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conn["SELECT * FROM users WHERE username='#{name}'"]
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# BAD: SQL statement constructed from user input
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conn.run("SELECT * FROM users WHERE username='#{name}'")
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# BAD: SQL statement constructed from user input
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conn.fetch("SELECT * FROM users WHERE username='#{name}'") do |row|
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puts row[:name]
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end
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# GOOD: SQL statement is not constructed from user input
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conn["SELECT * FROM users WHERE username='im_not_input'"]
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# BAD: SQL statement constructed from user input
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conn.execute "SELECT * FROM users WHERE username=#{name}"
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# BAD: SQL statement constructed from user input
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conn.execute_ddl "SELECT * FROM users WHERE username='#{name}'"
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# BAD: SQL statement constructed from user input
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conn.execute_dui "SELECT * FROM users WHERE username='#{name}'"
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# BAD: SQL statement constructed from user input
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conn.execute_insert "SELECT * FROM users WHERE username='#{name}'"
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# BAD: SQL statement constructed from user input
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conn << "SELECT * FROM users WHERE username='#{name}'"
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# BAD: SQL statement constructed from user input
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conn.fetch_rows("SELECT * FROM users WHERE username='#{name}'"){|row| }
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# BAD: SQL statement constructed from user input
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conn.dataset.with_sql_all("SELECT * FROM users WHERE username='#{name}'")
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# BAD: SQL statement constructed from user input
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conn.dataset.with_sql_delete("SELECT * FROM users WHERE username='#{name}'")
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# BAD: SQL statement constructed from user input
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conn.dataset.with_sql_each("SELECT * FROM users WHERE username='#{name}'"){|row| }
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# BAD: SQL statement constructed from user input
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conn.dataset.with_sql_first("SELECT * FROM users WHERE username='#{name}'")
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# BAD: SQL statement constructed from user input
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conn.dataset.with_sql_insert("SELECT * FROM users WHERE username='#{name}'")
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# BAD: SQL statement constructed from user input
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conn.dataset.with_sql_single_value("SELECT * FROM users WHERE username='#{name}'")
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# BAD: SQL statement constructed from user input
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conn.dataset.with_sql_update("SELECT * FROM users WHERE username='#{name}'")
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# BAD: SQL statement constructed from user input
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conn[:table].select(Sequel.cast(:a, name))
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# BAD: SQL statement constructed from user input
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conn[:table].select(Sequel.function(name))
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end
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end

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