Avoid manual SQL queries

Metadata

ID: java-security/sql-string-tainted

Language: Java

Severity: Error

Category: Security

Description

Never build SQL queries manually. Always have the query built with parameters and then, pass the parameters to the prepared statement.

Example of good use of Java and SQL queries with a parameter:

PreparedStatement statement = connection.prepareStatement("select * from mytable where name = ?");    
statement.setString(1, name);    
ResultSet resultSet = statement.executeQuery();

Learn More

Non-Compliant Code Examples

public class NotCompliant {

  @GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
  @ResponseBody
  public List<Server> sort(@RequestParam String column) throws Exception {
    List<Server> servers = new ArrayList<>();

    try (var connection = dataSource.getConnection()) {
      try (var statement =
          connection.prepareStatement(
              "select id, hostname, ip, mac, status, description from SERVERS where status <> 'out of order' order by "
                  + column)) {
        try (var rs = statement.executeQuery()) {
          while (rs.next()) {
            Server server =
                new Server(
                    rs.getString(1),
                    rs.getString(2),
                    rs.getString(3),
                    rs.getString(4),
                    rs.getString(5),
                    rs.getString(6));
            servers.add(server);
          }
        }
      }
    }
    return servers;
  }
}
public class NotCompliant {


  public String doStuff() {
    String query1 = "SELECT attr FROM table WHERE id=" + idToSearch;
    String query2 = String.format("SELECT attr FROM table WHERE id=%d", idToSearch);

    String query3 = "UPDATE table SET attr=" + idToSet + " WHERE id=" + idToSearch;
    String query4 = "DELETE FROM table WHERE id=" + idToSearch;
  }
}

Compliant Code Examples

public class NotCompliant {


  public String doStuff() {
    PreparedStatement statement = connection.prepareStatement("SELECT attr FROM table WHERE id = ?");    
    statement.setString(1, idToSearch);    
    ResultSet resultSet = statement.executeQuery();
  }
}
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