80 lines
1.7 KiB
Plaintext
80 lines
1.7 KiB
Plaintext
== Security
|
|
|
|
:toc: right
|
|
|
|
NOTE: The page is Work In Progress
|
|
|
|
This page documents security aspects of Nim and best practices.
|
|
|
|
Security features in the language:
|
|
|
|
* No pointer arithmetic
|
|
* http://nim-lang.org/docs/manual.html#taint-mode[Taint mode]
|
|
* The http://nim-lang.org/docs/manual.html#effect-system[Effect system] can be used for security
|
|
* Nim attempts to generate C code that does not rely on unsecure function/patterns (e.g. unchecked strcpy)
|
|
* The language encourage using immutable and const values
|
|
* Type conversions are memory-safe
|
|
* Low-level memory access allows mlock etc
|
|
* http://nim-lang.org/docs/manual.html#types-memory-regions[Memory regions] TODO
|
|
|
|
=== Compiling with GCC on Linux
|
|
|
|
Nim attempts to generate C code that does not rely on unsecure function/patterns.
|
|
As such, some of the options listed below might be less useful than when building pure-C applications.
|
|
|
|
|
|
All the following options enabled together:
|
|
|
|
[source,bash]
|
|
----
|
|
--passC:"-fPIE -Wformat -Wformat-security -D_FORTIFY_SOURCE=2 -O1 -fstack-protector-all" --passL:"-fPIE -pie -z relro -z now"
|
|
----
|
|
|
|
|
|
==== Stack protector
|
|
Terminate execution when the stack is being overwritten
|
|
|
|
[source,bash]
|
|
----
|
|
nim c --passC:"-fstack-protector-all"
|
|
----
|
|
|
|
==== Protect againt fixed-size buffer overflow
|
|
|
|
[source,bash]
|
|
----
|
|
nim c --passC:"-D_FORTIFY_SOURCE=2 -O1"
|
|
----
|
|
|
|
==== Warn on unsecure prinf usage
|
|
|
|
|
|
[source,bash]
|
|
----
|
|
nim c --passC:"-Wformat -Wformat-security"
|
|
----
|
|
|
|
==== Position independent executable
|
|
|
|
Enable ASLR
|
|
|
|
[source,bash]
|
|
----
|
|
nim c --passC:"-fPIE" --passL:"-fPIE -pie"
|
|
----
|
|
|
|
==== Full RELRO
|
|
|
|
Resolve dynamic symbols at startup and flag the GOT as read-only.
|
|
|
|
[source,bash]
|
|
----
|
|
nim c --passL:"-z relro -z now"
|
|
----
|
|
|
|
|
|
|
|
=== Resources
|
|
|
|
https://wiki.debian.org/Hardening
|