nixpkgs/nixos/modules/security/pam_mount.nix
Jenny 7abd408b7f
nixos/pam_mount: fix cryptmount options (#232873)
There was a bug in the pam_mount module that crypt mount options were
not passed to the mount.crypt command. This is now fixed and
additionally, a cryptMountOptions NixOS option is added to define mount
options that should apply to all crypt mounts.

Fixes #230920
2023-05-20 17:40:36 +02:00

184 lines
6.5 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.security.pam.mount;
oflRequired = cfg.logoutHup || cfg.logoutTerm || cfg.logoutKill;
fake_ofl = pkgs.writeShellScriptBin "fake_ofl" ''
SIGNAL=$1
MNTPT=$2
${pkgs.lsof}/bin/lsof | ${pkgs.gnugrep}/bin/grep $MNTPT | ${pkgs.gawk}/bin/awk '{print $2}' | ${pkgs.findutils}/bin/xargs ${pkgs.util-linux}/bin/kill -$SIGNAL
'';
anyPamMount = any (attrByPath ["pamMount"] false) (attrValues config.security.pam.services);
in
{
options = {
security.pam.mount = {
enable = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Enable PAM mount system to mount filesystems on user login.
'';
};
extraVolumes = mkOption {
type = types.listOf types.str;
default = [];
description = lib.mdDoc ''
List of volume definitions for pam_mount.
For more information, visit <http://pam-mount.sourceforge.net/pam_mount.conf.5.html>.
'';
};
additionalSearchPaths = mkOption {
type = types.listOf types.package;
default = [];
example = literalExpression "[ pkgs.bindfs ]";
description = lib.mdDoc ''
Additional programs to include in the search path of pam_mount.
Useful for example if you want to use some FUSE filesystems like bindfs.
'';
};
cryptMountOptions = mkOption {
type = types.listOf types.str;
default = [];
example = literalExpression ''
[ "allow_discard" ]
'';
description = lib.mdDoc ''
Global mount options that apply to every crypt volume.
You can define volume-specific options in the volume definitions.
'';
};
fuseMountOptions = mkOption {
type = types.listOf types.str;
default = [];
example = literalExpression ''
[ "nodev" "nosuid" "force-user=%(USER)" "gid=%(USERGID)" "perms=0700" "chmod-deny" "chown-deny" "chgrp-deny" ]
'';
description = lib.mdDoc ''
Global mount options that apply to every FUSE volume.
You can define volume-specific options in the volume definitions.
'';
};
debugLevel = mkOption {
type = types.int;
default = 0;
example = 1;
description = lib.mdDoc ''
Sets the Debug-Level. 0 disables debugging, 1 enables pam_mount tracing,
and 2 additionally enables tracing in mount.crypt. The default is 0.
For more information, visit <http://pam-mount.sourceforge.net/pam_mount.conf.5.html>.
'';
};
logoutWait = mkOption {
type = types.int;
default = 0;
description = lib.mdDoc ''
Amount of microseconds to wait until killing remaining processes after
final logout.
For more information, visit <http://pam-mount.sourceforge.net/pam_mount.conf.5.html>.
'';
};
logoutHup = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Kill remaining processes after logout by sending a SIGHUP.
'';
};
logoutTerm = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Kill remaining processes after logout by sending a SIGTERM.
'';
};
logoutKill = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Kill remaining processes after logout by sending a SIGKILL.
'';
};
createMountPoints = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Create mountpoints for volumes if they do not exist.
'';
};
removeCreatedMountPoints = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Remove mountpoints created by pam_mount after logout. This
only affects mountpoints that have been created by pam_mount
in the same session.
'';
};
};
};
config = mkIf (cfg.enable || anyPamMount) {
environment.systemPackages = [ pkgs.pam_mount ];
environment.etc."security/pam_mount.conf.xml" = {
source =
let
extraUserVolumes = filterAttrs (n: u: u.cryptHomeLuks != null || u.pamMount != {}) config.users.users;
mkAttr = k: v: ''${k}="${v}"'';
userVolumeEntry = user: let
attrs = {
user = user.name;
path = user.cryptHomeLuks;
mountpoint = user.home;
} // user.pamMount;
in
"<volume ${concatStringsSep " " (mapAttrsToList mkAttr attrs)} />\n";
in
pkgs.writeText "pam_mount.conf.xml" ''
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE pam_mount SYSTEM "pam_mount.conf.xml.dtd">
<!-- auto generated from Nixos: modules/config/users-groups.nix -->
<pam_mount>
<debug enable="${toString cfg.debugLevel}" />
<!-- if activated, requires ofl from hxtools to be present -->
<logout wait="${toString cfg.logoutWait}" hup="${if cfg.logoutHup then "yes" else "no"}" term="${if cfg.logoutTerm then "yes" else "no"}" kill="${if cfg.logoutKill then "yes" else "no"}" />
<!-- set PATH variable for pam_mount module -->
<path>${makeBinPath ([ pkgs.util-linux ] ++ cfg.additionalSearchPaths)}</path>
<!-- create mount point if not present -->
<mkmountpoint enable="${if cfg.createMountPoints then "1" else "0"}" remove="${if cfg.removeCreatedMountPoints then "true" else "false"}" />
<!-- specify the binaries to be called -->
<fusemount>${pkgs.fuse}/bin/mount.fuse %(VOLUME) %(MNTPT) -o ${concatStringsSep "," (cfg.fuseMountOptions ++ [ "%(OPTIONS)" ])}</fusemount>
<fuseumount>${pkgs.fuse}/bin/fusermount -u %(MNTPT)</fuseumount>
<cryptmount>${pkgs.pam_mount}/bin/mount.crypt -o ${concatStringsSep "," (cfg.cryptMountOptions ++ [ "%(OPTIONS)" ])} %(VOLUME) %(MNTPT)</cryptmount>
<cryptumount>${pkgs.pam_mount}/bin/umount.crypt %(MNTPT)</cryptumount>
<pmvarrun>${pkgs.pam_mount}/bin/pmvarrun -u %(USER) -o %(OPERATION)</pmvarrun>
${optionalString oflRequired "<ofl>${fake_ofl}/bin/fake_ofl %(SIGNAL) %(MNTPT)</ofl>"}
${concatStrings (map userVolumeEntry (attrValues extraUserVolumes))}
${concatStringsSep "\n" cfg.extraVolumes}
</pam_mount>
'';
};
};
}