diff options
Diffstat (limited to 'nixpkgs/nixos/tests/wrappers.nix')
| -rw-r--r-- | nixpkgs/nixos/tests/wrappers.nix | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/nixpkgs/nixos/tests/wrappers.nix b/nixpkgs/nixos/tests/wrappers.nix new file mode 100644 index 000000000000..1d4fa85d7399 --- /dev/null +++ b/nixpkgs/nixos/tests/wrappers.nix @@ -0,0 +1,112 @@ +import ./make-test-python.nix ({ pkgs, ... }: +let + userUid = 1000; + usersGid = 100; + busybox = pkgs : pkgs.busybox.override { + # Without this, the busybox binary drops euid to ruid for most applets, including id. + # See https://bugs.busybox.net/show_bug.cgi?id=15101 + extraConfig = "CONFIG_FEATURE_SUID n"; + }; +in +{ + name = "wrappers"; + + nodes.machine = { config, pkgs, ... }: { + ids.gids.users = usersGid; + + users.users = { + regular = { + uid = userUid; + isNormalUser = true; + }; + }; + + security.apparmor.enable = true; + + security.wrappers = { + suidRoot = { + owner = "root"; + group = "root"; + setuid = true; + source = "${busybox pkgs}/bin/busybox"; + program = "suid_root_busybox"; + }; + sgidRoot = { + owner = "root"; + group = "root"; + setgid = true; + source = "${busybox pkgs}/bin/busybox"; + program = "sgid_root_busybox"; + }; + withChown = { + owner = "root"; + group = "root"; + source = "${pkgs.libcap}/bin/capsh"; + program = "capsh_with_chown"; + capabilities = "cap_chown+ep"; + }; + }; + }; + + testScript = + '' + def cmd_as_regular(cmd): + return "su -l regular -c '{0}'".format(cmd) + + def test_as_regular(cmd, expected): + out = machine.succeed(cmd_as_regular(cmd)).strip() + assert out == expected, "Expected {0} to output {1}, but got {2}".format(cmd, expected, out) + + def test_as_regular_in_userns_mapped_as_root(cmd, expected): + out = machine.succeed(f"su -l regular -c '${pkgs.util-linux}/bin/unshare -rm {cmd}'").strip() + assert out == expected, "Expected {0} to output {1}, but got {2}".format(cmd, expected, out) + + test_as_regular('${busybox pkgs}/bin/busybox id -u', '${toString userUid}') + test_as_regular('${busybox pkgs}/bin/busybox id -ru', '${toString userUid}') + test_as_regular('${busybox pkgs}/bin/busybox id -g', '${toString usersGid}') + test_as_regular('${busybox pkgs}/bin/busybox id -rg', '${toString usersGid}') + + test_as_regular('/run/wrappers/bin/suid_root_busybox id -u', '0') + test_as_regular('/run/wrappers/bin/suid_root_busybox id -ru', '${toString userUid}') + test_as_regular('/run/wrappers/bin/suid_root_busybox id -g', '${toString usersGid}') + test_as_regular('/run/wrappers/bin/suid_root_busybox id -rg', '${toString usersGid}') + + test_as_regular('/run/wrappers/bin/sgid_root_busybox id -u', '${toString userUid}') + test_as_regular('/run/wrappers/bin/sgid_root_busybox id -ru', '${toString userUid}') + test_as_regular('/run/wrappers/bin/sgid_root_busybox id -g', '0') + test_as_regular('/run/wrappers/bin/sgid_root_busybox id -rg', '${toString usersGid}') + + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/suid_root_busybox id -u', '0') + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/suid_root_busybox id -ru', '0') + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/suid_root_busybox id -g', '0') + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/suid_root_busybox id -rg', '0') + + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/sgid_root_busybox id -u', '0') + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/sgid_root_busybox id -ru', '0') + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/sgid_root_busybox id -g', '0') + test_as_regular_in_userns_mapped_as_root('/run/wrappers/bin/sgid_root_busybox id -rg', '0') + + # Test that in nonewprivs environment the wrappers simply exec their target. + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/suid_root_busybox id -u', '${toString userUid}') + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/suid_root_busybox id -ru', '${toString userUid}') + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/suid_root_busybox id -g', '${toString usersGid}') + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/suid_root_busybox id -rg', '${toString usersGid}') + + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/sgid_root_busybox id -u', '${toString userUid}') + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/sgid_root_busybox id -ru', '${toString userUid}') + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/sgid_root_busybox id -g', '${toString usersGid}') + test_as_regular('${pkgs.util-linux}/bin/setpriv --no-new-privs /run/wrappers/bin/sgid_root_busybox id -rg', '${toString usersGid}') + + # We are only testing the permitted set, because it's easiest to look at with capsh. + machine.fail(cmd_as_regular('${pkgs.libcap}/bin/capsh --has-p=CAP_CHOWN')) + machine.fail(cmd_as_regular('${pkgs.libcap}/bin/capsh --has-p=CAP_SYS_ADMIN')) + machine.succeed(cmd_as_regular('/run/wrappers/bin/capsh_with_chown --has-p=CAP_CHOWN')) + machine.fail(cmd_as_regular('/run/wrappers/bin/capsh_with_chown --has-p=CAP_SYS_ADMIN')) + + # Test that the only user of apparmor policy includes generated by + # wrappers works. Ideally this'd be located in a test for the module that + # actually makes the apparmor policy for ping, but there's no convenient + # test for that one. + machine.succeed("ping -c 1 127.0.0.1") + ''; +}) |