nixpkgs/nixos/tests/logrotate.nix
Martin Weinelt 01d0b0b683
nixos/logrotate: harden systemd unit
Logrotate is a service that runs as root and moves logfiles around while
keeping ownership of these files intact. This means we can and should
severely limit the scope of what can be done during its runtime.
2024-09-09 02:53:36 +02:00

134 lines
4.9 KiB
Nix

# Test logrotate service works and is enabled by default
let
importTest = { ... }: {
services.logrotate.settings.import = {
olddir = false;
};
};
in
import ./make-test-python.nix ({ pkgs, ... }: rec {
name = "logrotate";
meta = with pkgs.lib.maintainers; {
maintainers = [ martinetd ];
};
nodes = {
defaultMachine = { ... }: {
services.logrotate.enable = true;
};
failingMachine = { ... }: {
services.logrotate = {
enable = true;
configFile = pkgs.writeText "logrotate.conf" ''
# self-written config file
su notarealuser notagroupeither
'';
};
};
machine = { config, ... }: {
imports = [ importTest ];
services.logrotate = {
enable = true;
settings = {
# remove default frequency header and add another
header = {
frequency = null;
delaycompress = true;
};
# extra global setting... affecting nothing
last_line = {
global = true;
priority = 2000;
shred = true;
};
# using mail somewhere should add --mail to logrotate invocation
sendmail = {
mail = "user@domain.tld";
};
# postrotate should be suffixed by 'endscript'
postrotate = {
postrotate = "touch /dev/null";
};
# check checkConfig works as expected: there is nothing to check here
# except that the file build passes
checkConf = {
su = "root utmp";
createolddir = "0750 root utmp";
create = "root utmp";
"create " = "0750 root utmp";
};
# multiple paths should be aggregated
multipath = {
files = [ "file1" "file2" ];
};
# overriding imported path should keep existing attributes
# (e.g. olddir is still set)
import = {
notifempty = true;
};
};
};
};
};
testScript =
''
with subtest("whether logrotate works"):
# we must rotate once first to create logrotate stamp
defaultMachine.succeed("systemctl start logrotate.service")
# we need to wait for console text once here to
# clear console buffer up to this point for next wait
defaultMachine.wait_for_console_text('logrotate.service: Deactivated successfully')
defaultMachine.succeed(
# wtmp is present in default config.
"rm -f /var/log/wtmp*",
# we need to give it at least 1MB
"dd if=/dev/zero of=/var/log/wtmp bs=2M count=1",
# move into the future and check rotation.
"date -s 'now + 1 month + 1 day'")
defaultMachine.wait_for_console_text('logrotate.service: Deactivated successfully')
defaultMachine.succeed(
# check rotate worked
"[ -e /var/log/wtmp.1 ]",
)
with subtest("default config does not have mail"):
defaultMachine.fail("systemctl cat logrotate.service | grep -- --mail")
with subtest("using mails adds mail option"):
machine.succeed("systemctl cat logrotate.service | grep -- --mail")
with subtest("check generated config matches expectation"):
machine.succeed(
# copy conf to /tmp/logrotate.conf for easy grep
"conf=$(systemctl cat logrotate | grep -oE '/nix/store[^ ]*logrotate.conf'); cp $conf /tmp/logrotate.conf",
"! grep weekly /tmp/logrotate.conf",
"grep -E '^delaycompress' /tmp/logrotate.conf",
"tail -n 1 /tmp/logrotate.conf | grep shred",
"sed -ne '/\"sendmail\" {/,/}/p' /tmp/logrotate.conf | grep 'mail user@domain.tld'",
"sed -ne '/\"postrotate\" {/,/}/p' /tmp/logrotate.conf | grep endscript",
"grep '\"file1\"\n\"file2\" {' /tmp/logrotate.conf",
"sed -ne '/\"import\" {/,/}/p' /tmp/logrotate.conf | grep noolddir",
)
# also check configFile option
failingMachine.succeed(
"conf=$(systemctl cat logrotate | grep -oE '/nix/store[^ ]*logrotate.conf'); cp $conf /tmp/logrotate.conf",
"grep 'self-written config' /tmp/logrotate.conf",
)
with subtest("Check logrotate-checkconf service"):
machine.wait_for_unit("logrotate-checkconf.service")
# wait_for_unit also asserts for success, so wait for
# parent target instead and check manually.
failingMachine.wait_for_unit("multi-user.target")
info = failingMachine.get_unit_info("logrotate-checkconf.service")
if info["ActiveState"] != "failed":
raise Exception('logrotate-checkconf.service was not failed')
machine.log(machine.execute("systemd-analyze security logrotate.service | grep -v ")[1])
'';
})