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.
70 lines
1.9 KiB
Nix
70 lines
1.9 KiB
Nix
import ../make-test-python.nix ({ pkgs, lib, ... }:
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let
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testOnlySSHCredentials = pkgs.runCommand "pam-ussh-test-ca" {
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nativeBuildInputs = [ pkgs.openssh ];
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} ''
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mkdir $out
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ssh-keygen -t ed25519 -N "" -f $out/ca
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ssh-keygen -t ed25519 -N "" -f $out/alice
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ssh-keygen -s $out/ca -I "alice user key" -n "alice,root" -V 19700101:forever $out/alice.pub
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ssh-keygen -t ed25519 -N "" -f $out/bob
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ssh-keygen -s $out/ca -I "bob user key" -n "bob" -V 19700101:forever $out/bob.pub
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'';
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makeTestScript = user: pkgs.writeShellScript "pam-ussh-${user}-test-script" ''
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set -euo pipefail
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eval $(${pkgs.openssh}/bin/ssh-agent)
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mkdir -p $HOME/.ssh
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chmod 700 $HOME/.ssh
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cp ${testOnlySSHCredentials}/${user}{,.pub,-cert.pub} $HOME/.ssh
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chmod 600 $HOME/.ssh/${user}
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chmod 644 $HOME/.ssh/${user}{,-cert}.pub
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set -x
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${pkgs.openssh}/bin/ssh-add $HOME/.ssh/${user}
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${pkgs.openssh}/bin/ssh-add -l &>2
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exec sudo id -u -n
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'';
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in {
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name = "pam-ussh";
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meta.maintainers = with lib.maintainers; [ lukegb ];
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machine =
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{ ... }:
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{
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users.users.alice = { isNormalUser = true; extraGroups = [ "wheel" ]; };
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users.users.bob = { isNormalUser = true; extraGroups = [ "wheel" ]; };
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security.pam.ussh = {
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enable = true;
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authorizedPrincipals = "root";
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caFile = "${testOnlySSHCredentials}/ca.pub";
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};
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security.sudo = {
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enable = true;
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extraConfig = ''
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Defaults lecture="never"
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'';
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};
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};
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testScript =
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''
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with subtest("alice should be allowed to escalate to root"):
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machine.succeed(
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'su -c "${makeTestScript "alice"}" -l alice | grep root'
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)
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with subtest("bob should not be allowed to escalate to root"):
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machine.fail(
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'su -c "${makeTestScript "bob"}" -l bob | grep root'
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)
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'';
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})
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