caps
A pure-Rust library to work with Linux capabilities.
caps
provides support for manipulating capabilities available in modern Linux
kernels. It supports traditional POSIX sets (Effective, Inheritable, Permitted)
as well as Linux-specific Ambient and Bounding capabilities sets.
caps
provides a simple and idiomatic interface to handle capabilities on Linux.
See capabilities(7)
for more details.
Motivations
This library tries to achieve the following goals:
- fully support modern kernels, including recent capabilities and sets
- provide an idiomatic interface
- be usable in static targets, without requiring an external C library
Example
extern crate caps;
use caps::{Capability, CapSet};
fn manipulate_caps() {
// Retrieve permitted set.
let cur = caps::read(None, CapSet::Permitted).unwrap();
println!("Current permitted caps: {:?}.", cur);
// Retrieve effective set.
let cur = caps::read(None, CapSet::Effective).unwrap();
println!("Current effective caps: {:?}.", cur);
// Check if CAP_CHOWN is in permitted set.
let perm_chown = caps::has_cap(None, CapSet::Permitted, Capability::CAP_CHOWN).unwrap();
if !perm_chown.unwrap() {
println!("Try running this as root!");
return;
}
// Clear all effective caps.
caps::clear(None, CapSet::Effective).unwrap();
println!("Cleared effective caps.");
let cur = caps::read(None, CapSet::Effective).unwrap();
println!("Current effective caps: {:?}.", cur);
// Since `CAP_CHOWN` is still in permitted, it can be raised again.
caps::raise(None, CapSet::Effective, Capability::CAP_CHOWN).unwrap();
println!("Raised CAP_CHOWN in effective set.");
let cur = caps::read(None, CapSet::Effective).unwrap();
println!("Current effective caps: {:?}.", cur);
}
Some more examples are available under examples.
License
Licensed under either of
- MIT license - http://opensource.org/licenses/MIT
- Apache License, Version 2.0 - http://www.apache.org/licenses/LICENSE-2.0
at your option.