Module io.github.pixee.security

Package io.github.pixee.security

Class SystemCommand

java.lang.Object

io.github.pixee.security.SystemCommand

public final class SystemCommand
extends java.lang.Object

This type offers utility methods to run system commands more safely.

Method Summary

Modifier and Type	Method	Description
static java.util.Set<SystemCommandRestrictions>	defaultRestrictions()	The default restrictions if none are specified.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String command)	Delegates to runCommand(Runtime, String, Set) with default restrictions.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String[] command)	Delegates to runCommand(Runtime, String[], Set) with default restrictions.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String[] command, java.lang.String[] envp)	Delegates to runCommand(Runtime, String[], String[], Set) with default restrictions.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String[] command, java.lang.String[] envp, java.io.File dir)	Delegates to runCommand(Runtime, String[], String[], File, Set) with default restrictions.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String[] command, java.lang.String[] envp, java.io.File dir, java.util.Set<SystemCommandRestrictions> restrictions)	Same as runCommand(Runtime, String[], Set) but also include more data to pass into Runtime.exec(String[], String[], File).
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String[] command, java.lang.String[] envp, java.util.Set<SystemCommandRestrictions> restrictions)	Same as runCommand(Runtime, String[], Set) but also include more data to pass into Runtime.exec(String[], String[]).
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String[] command, java.util.Set<SystemCommandRestrictions> restrictions)	Does the same as Runtime.exec(String[]), but adds restrictions on what types of commands will be allowed.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String command, java.lang.String[] envp)	Delegates to runCommand(Runtime, String, String[], Set) with default restrictions.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String command, java.lang.String[] envp, java.io.File dir)	Delegates to runCommand(Runtime, String, String[], File, Set) with default restrictions.
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String command, java.lang.String[] envp, java.io.File dir, java.util.Set<SystemCommandRestrictions> restrictions)	Same as runCommand(Runtime, String, Set) but also include more data to pass into Runtime.exec(String, String[], File).
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String command, java.lang.String[] envp, java.util.Set<SystemCommandRestrictions> restrictions)	Same as runCommand(Runtime, String, Set) but also include more data to pass into Runtime.exec(String, String[]).
static java.lang.Process	runCommand(java.lang.Runtime runtime, java.lang.String command, java.util.Set<SystemCommandRestrictions> restrictions)	Does the same as Runtime.exec(String), but adds restrictions on what types of commands will be allowed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

defaultRestrictions

public static java.util.Set<SystemCommandRestrictions> defaultRestrictions()

The default restrictions if none are specified.

Returns:

a set of restrictions suitable for general use

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String command,
                                           java.util.Set<SystemCommandRestrictions> restrictions)
                                    throws java.io.IOException

Does the same as Runtime.exec(String), but adds restrictions on what types of commands will be allowed. Will throw a SecurityException if any of the restrictions may be violated by the command found. Note that the method of detecting violations is based on semantic analysis of the command, and so is vulnerable to impedance mismatches between the analysis we perform and whatever shell is interpreting the command. Either way, it's a lot safer.

Parameters:

command - the system command about to be run

runtime - the runtime to run with

restrictions - the set of restrictions to run with

Returns:

the Process that results from the hardened Runtime.exec(String) call

Throws:

java.lang.SecurityException - if multiple commands are found

java.lang.IllegalArgumentException - if restriction is null

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String command)
                                    throws java.io.IOException

Delegates to runCommand(Runtime, String, Set) with default restrictions.

Parameters:

runtime - the runtime to run with

command - the system command about to be run

Returns:

the Process that results from the hardened Runtime.exec(String) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String[] command,
                                           java.util.Set<SystemCommandRestrictions> restrictions)
                                    throws java.io.IOException

Does the same as Runtime.exec(String[]), but adds restrictions on what types of commands will be allowed. Will throw a SecurityException if any of the restrictions may be violated by the command found. Note that the method of detecting violations is based on semantic analysis of the command, and so is vulnerable to impedance mismatches between the analysis we perform and whatever shell is interpreting the command. Either way, it's a lot safer.

Parameters:

command - the system command about to be run

runtime - the runtime to run with

restrictions - the set of restrictions to run with

Returns:

the Process that results from the hardened Runtime.exec(String[]) call

Throws:

java.lang.SecurityException - if multiple commands are found

java.lang.IllegalArgumentException - if restriction is null

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String[] command)
                                    throws java.io.IOException

Delegates to runCommand(Runtime, String[], Set) with default restrictions.

Parameters:

runtime - the runtime to run with

command - the system command about to be run

Returns:

the Process that results from the hardened Runtime.exec(String[]) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String[] command,
                                           java.lang.String[] envp,
                                           java.util.Set<SystemCommandRestrictions> restrictions)
                                    throws java.io.IOException

Same as runCommand(Runtime, String[], Set) but also include more data to pass into Runtime.exec(String[], String[]).

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

restrictions - the set of restrictions to run with

Returns:

the Process that results from the hardened Runtime.exec(String[]) call

Throws:

java.lang.SecurityException - if multiple commands are found

java.lang.IllegalArgumentException - if restriction is null

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String[] command,
                                           java.lang.String[] envp)
                                    throws java.io.IOException

Delegates to runCommand(Runtime, String[], String[], Set) with default restrictions.

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

Returns:

the Process that results from the hardened Runtime.exec(String[], String[]) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String[] command,
                                           java.lang.String[] envp,
                                           java.io.File dir,
                                           java.util.Set<SystemCommandRestrictions> restrictions)
                                    throws java.io.IOException

Same as runCommand(Runtime, String[], Set) but also include more data to pass into Runtime.exec(String[], String[], File).

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

dir - the working directory to run the system command in

restrictions - the set of restrictions to run with

Returns:

the Process that results from the hardened Runtime.exec(String[], String[], File) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String command,
                                           java.lang.String[] envp,
                                           java.util.Set<SystemCommandRestrictions> restrictions)
                                    throws java.io.IOException

Same as runCommand(Runtime, String, Set) but also include more data to pass into Runtime.exec(String, String[]).

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

restrictions - the set of restrictions to run with

Returns:

the Process that results from the hardened Runtime.exec(String, String[]) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String command,
                                           java.lang.String[] envp)
                                    throws java.io.IOException

Delegates to runCommand(Runtime, String, String[], Set) with default restrictions.

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

Returns:

the Process that results from the hardened Runtime.exec(String, String[]) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String command,
                                           java.lang.String[] envp,
                                           java.io.File dir,
                                           java.util.Set<SystemCommandRestrictions> restrictions)
                                    throws java.io.IOException

Same as runCommand(Runtime, String, Set) but also include more data to pass into Runtime.exec(String, String[], File).

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

dir - the working directory to run the system command in

restrictions - the set of restrictions to run with

Returns:

the Process that results from the hardened Runtime.exec(String, String[], File) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String command,
                                           java.lang.String[] envp,
                                           java.io.File dir)
                                    throws java.io.IOException

Delegates to runCommand(Runtime, String, String[], File, Set) with default restrictions.

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

dir - the working directory to run the system command in

Returns:

the Process that results from the hardened Runtime.exec(String, String[], File) call

Throws:

java.io.IOException - from the wrapped system process invocation call

runCommand

public static java.lang.Process runCommand(java.lang.Runtime runtime,
                                           java.lang.String[] command,
                                           java.lang.String[] envp,
                                           java.io.File dir)
                                    throws java.io.IOException

Delegates to runCommand(Runtime, String[], String[], File, Set) with default restrictions.

Parameters:

runtime - the runtime to run with

command - the system command about to be run

envp - the environment variables

dir - the working directory to run the system command in

Returns:

the Process that results from the hardened Runtime.exec(String[], String[], File) call

Throws:

java.io.IOException - from the wrapped system process invocation call