mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-25 15:13:46 +00:00
1853015550
pam-ussh allows authorizing using an SSH certificate stored in your SSH agent, in a similar manner to pam-ssh-agent-auth, but for certificates rather than raw public keys.
71 lines
1.9 KiB
Nix
71 lines
1.9 KiB
Nix
import ../make-test-python.nix ({ pkgs, lib, ... }:
|
|
|
|
let
|
|
testOnlySSHCredentials = pkgs.runCommand "pam-ussh-test-ca" {
|
|
nativeBuildInputs = [ pkgs.openssh ];
|
|
} ''
|
|
mkdir $out
|
|
ssh-keygen -t ed25519 -N "" -f $out/ca
|
|
|
|
ssh-keygen -t ed25519 -N "" -f $out/alice
|
|
ssh-keygen -s $out/ca -I "alice user key" -n "alice,root" -V 19700101:forever $out/alice.pub
|
|
|
|
ssh-keygen -t ed25519 -N "" -f $out/bob
|
|
ssh-keygen -s $out/ca -I "bob user key" -n "bob" -V 19700101:forever $out/bob.pub
|
|
'';
|
|
makeTestScript = user: pkgs.writeShellScript "pam-ussh-${user}-test-script" ''
|
|
set -euo pipefail
|
|
|
|
eval $(${pkgs.openssh}/bin/ssh-agent)
|
|
|
|
mkdir -p $HOME/.ssh
|
|
chmod 700 $HOME/.ssh
|
|
cp ${testOnlySSHCredentials}/${user}{,.pub,-cert.pub} $HOME/.ssh
|
|
chmod 600 $HOME/.ssh/${user}
|
|
chmod 644 $HOME/.ssh/${user}{,-cert}.pub
|
|
|
|
set -x
|
|
|
|
${pkgs.openssh}/bin/ssh-add $HOME/.ssh/${user}
|
|
${pkgs.openssh}/bin/ssh-add -l &>2
|
|
|
|
exec sudo id -u -n
|
|
'';
|
|
in {
|
|
name = "pam-ussh";
|
|
meta.maintainers = with lib.maintainers; [ lukegb ];
|
|
|
|
machine =
|
|
{ ... }:
|
|
{
|
|
users.users.alice = { isNormalUser = true; extraGroups = [ "wheel" ]; };
|
|
users.users.bob = { isNormalUser = true; extraGroups = [ "wheel" ]; };
|
|
|
|
security.pam.ussh = {
|
|
enable = true;
|
|
authorizedPrincipals = "root";
|
|
caFile = "${testOnlySSHCredentials}/ca.pub";
|
|
};
|
|
|
|
security.sudo = {
|
|
enable = true;
|
|
extraConfig = ''
|
|
Defaults lecture="never"
|
|
'';
|
|
};
|
|
};
|
|
|
|
testScript =
|
|
''
|
|
with subtest("alice should be allowed to escalate to root"):
|
|
machine.succeed(
|
|
'su -c "${makeTestScript "alice"}" -l alice | grep root'
|
|
)
|
|
|
|
with subtest("bob should not be allowed to escalate to root"):
|
|
machine.fail(
|
|
'su -c "${makeTestScript "bob"}" -l bob | grep root'
|
|
)
|
|
'';
|
|
})
|