nixpkgs/nixos/tests/sudo.nix

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# Some tests to ensure sudo is working properly.
let
password = "helloworld";
in
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import ./make-test-python.nix ({ pkgs, ...} : {
name = "sudo";
meta = with pkgs.lib.maintainers; {
maintainers = [ lschuermann ];
};
nodes.machine =
{ lib, ... }:
with lib;
{
users.groups = { foobar = {}; barfoo = {}; baz = { gid = 1337; }; };
users.users = {
test0 = { isNormalUser = true; extraGroups = [ "wheel" ]; };
test1 = { isNormalUser = true; password = password; };
test2 = { isNormalUser = true; extraGroups = [ "foobar" ]; password = password; };
test3 = { isNormalUser = true; extraGroups = [ "barfoo" ]; };
test4 = { isNormalUser = true; extraGroups = [ "baz" ]; };
test5 = { isNormalUser = true; };
};
security.sudo = {
enable = true;
wheelNeedsPassword = false;
nixos/sudo: fix test for 1.9.9 The test failed with > Test "test5 user should not be able to run commands under root" failed with > error: "invalid literal for int() with base 10: ''" since 2492da88ea018c067c2dee5b6eef5b65c5283597. The reason for this is that `sudo(8)` writes the lecture to the tty[1] and only as a fallback to stdout[2]. This means that the `base64 --wrap 0` executed by `machine.execute()` doesn't affect the text written to the terminal, however the lecture is part of the string that's read from the VM via `shell.recv()`. I confirmed the problem in an interactive test session[3]: >>> command = "sudo -u test5 sudo -n -u root true" >>> out_command = f"( set -euo pipefail; {command} ) | (base64 --wrap 0; echo)\n" >>> machine.shell.send(out_command.encode()) 84 >>> machine # [ 99.015512] sudo[877]: root : TTY=hvc0 ; PWD=/tmp ; USER=test5 ; COMMAND=/run/wrappers/bin/sudo -n -u root true machine # [ 99.019373] sudo[877]: pam_unix(sudo:session): session opened for user test5(uid=1005) by (uid=0) machine # [ 99.038692] sudo[879]: pam_unix(sudo:auth): conversation failed machine # sudo: a password is required machine # [ 99.041860] sudo[879]: pam_unix(sudo:auth): auth could not identify password for [test5] machine # [ 99.046901] sudo[877]: pam_unix(sudo:session): session closed for user test5 >>> >>> x=machine._next_newline_closed_block_from_shell() >>> print(x) <newline> We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: <newline> #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. <newline> <newline> <newline> >>> Since the lecture isn't strictly necessary to confirm that `security.sudo` works as expected, I decided to disable lecturing inside the test, however we may want to fix the underlying problem in the test-driver at some point. [1] https://github.com/sudo-project/sudo/blob/SUDO_1_9_9/plugins/sudoers/check.c#L275-L283 [2] https://github.com/sudo-project/sudo/blob/SUDO_1_9_9/src/conversation.c#L95-L120 [3] I replaced each empty line with `<newline>` to make sure these aren't swallowed by git.
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extraConfig = ''
Defaults lecture="never"
'';
extraRules = [
# SUDOERS SYNTAX CHECK (Test whether the module produces a valid output;
# errors being detected by the visudo checks.
# These should not create any entries
{ users = [ "notest1" ]; commands = [ ]; }
{ commands = [ { command = "ALL"; options = [ ]; } ]; }
# Test defining commands with the options syntax, though not setting any options
{ users = [ "notest2" ]; commands = [ { command = "ALL"; options = [ ]; } ]; }
# CONFIGURATION FOR TEST CASES
{ users = [ "test1" ]; groups = [ "foobar" ]; commands = [ "ALL" ]; }
{ groups = [ "barfoo" 1337 ]; commands = [ { command = "ALL"; options = [ "NOPASSWD" "NOSETENV" ]; } ]; }
{ users = [ "test5" ]; commands = [ { command = "ALL"; options = [ "NOPASSWD" "SETENV" ]; } ]; runAs = "test1:barfoo"; }
];
};
};
nodes.strict = { ... }: {
users.users = {
admin = { isNormalUser = true; extraGroups = [ "wheel" ]; };
noadmin = { isNormalUser = true; };
};
security.sudo = {
enable = true;
wheelNeedsPassword = false;
execWheelOnly = true;
};
};
testScript =
''
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with subtest("users in wheel group should have passwordless sudo"):
machine.succeed('su - test0 -c "sudo -u root true"')
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with subtest("test1 user should have sudo with password"):
machine.succeed('su - test1 -c "echo ${password} | sudo -S -u root true"')
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with subtest("test1 user should not be able to use sudo without password"):
machine.fail('su - test1 -c "sudo -n -u root true"')
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with subtest("users in group 'foobar' should be able to use sudo with password"):
machine.succeed('su - test2 -c "echo ${password} | sudo -S -u root true"')
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with subtest("users in group 'barfoo' should be able to use sudo without password"):
machine.succeed("sudo -u test3 sudo -n -u root true")
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with subtest("users in group 'baz' (GID 1337)"):
machine.succeed("sudo -u test4 sudo -n -u root echo true")
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with subtest("test5 user should be able to run commands under test1"):
machine.succeed("sudo -u test5 sudo -n -u test1 true")
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with subtest("test5 user should not be able to run commands under root"):
machine.fail("sudo -u test5 sudo -n -u root true")
with subtest("test5 user should be able to keep their environment"):
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machine.succeed("sudo -u test5 sudo -n -E -u test1 true")
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with subtest("users in group 'barfoo' should not be able to keep their environment"):
machine.fail("sudo -u test3 sudo -n -E -u root true")
with subtest("users in wheel should be able to run sudo despite execWheelOnly"):
strict.succeed('su - admin -c "sudo -u root true"')
with subtest("non-wheel users should be unable to run sudo thanks to execWheelOnly"):
strict.fail('su - noadmin -c "sudo --help"')
'';
})