pam_mount module: integrate pam_mount into PAM of NixOS

This commit is contained in:
Thomas Strobel 2015-07-02 16:46:56 +02:00
parent a5360c5b6e
commit 7b6f279142
4 changed files with 98 additions and 2 deletions

View file

@ -108,6 +108,15 @@ let
description = "The user's home directory.";
};
cryptHomeLuks = mkOption {
type = with types; nullOr str;
default = null;
description = ''
Path to encrypted luks device that contains
the user's home directory.
'';
};
shell = mkOption {
type = types.str;
default = "/run/current-system/sw/bin/nologin";

View file

@ -84,6 +84,7 @@
./security/grsecurity.nix
./security/pam.nix
./security/pam_usb.nix
./security/pam_mount.nix
./security/polkit.nix
./security/prey.nix
./security/rngd.nix

View file

@ -126,6 +126,14 @@ let
'';
};
pamMount = mkOption {
default = config.security.pam.mount.enable;
type = types.bool;
description = ''
Enable PAM mount (pam_mount) system to mount fileystems on user login.
'';
};
allowNullPassword = mkOption {
default = false;
type = types.bool;
@ -224,7 +232,9 @@ let
${optionalString cfg.usbAuth
"auth sufficient ${pkgs.pam_usb}/lib/security/pam_usb.so"}
${optionalString cfg.unixAuth
"auth ${if config.security.pam.enableEcryptfs then "required" else "sufficient"} pam_unix.so ${optionalString cfg.allowNullPassword "nullok"} likeauth"}
"auth ${if (config.security.pam.enableEcryptfs || cfg.pamMount) then "required" else "sufficient"} pam_unix.so ${optionalString cfg.allowNullPassword "nullok"} likeauth"}
${optionalString cfg.pamMount
"auth optional ${pkgs.pam_mount}/lib/security/pam_mount.so"}
${optionalString config.security.pam.enableEcryptfs
"auth required ${pkgs.ecryptfs}/lib/security/pam_ecryptfs.so unwrap"}
${optionalString cfg.otpwAuth
@ -238,12 +248,14 @@ let
auth [default=die success=done] ${pam_ccreds}/lib/security/pam_ccreds.so action=validate use_first_pass
auth sufficient ${pam_ccreds}/lib/security/pam_ccreds.so action=store use_first_pass
''}
${optionalString (! config.security.pam.enableEcryptfs) "auth required pam_deny.so"}
${optionalString (!(config.security.pam.enableEcryptfs || cfg.pamMount)) "auth required pam_deny.so"}
# Password management.
${optionalString config.security.pam.enableEcryptfs
"password optional ${pkgs.ecryptfs}/lib/security/pam_ecryptfs.so"}
password requisite pam_unix.so nullok sha512
${optionalString cfg.pamMount
"password optional ${pkgs.pam_mount}/lib/security/pam_mount.so"}
${optionalString config.users.ldap.enable
"password sufficient ${pam_ldap}/lib/security/pam_ldap.so"}
${optionalString config.krb5.enable
@ -280,6 +292,8 @@ let
"session required ${pkgs.pam}/lib/security/pam_limits.so conf=${makeLimitsConf cfg.limits}"}
${optionalString (cfg.showMotd && config.users.motd != null)
"session optional ${pkgs.pam}/lib/security/pam_motd.so motd=${motd}"}
${optionalString cfg.pamMount
"session optional ${pkgs.pam_mount}/lib/security/pam_mount.so"}
'';
};

View file

@ -0,0 +1,72 @@
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.security.pam.mount;
anyPamMount = any (attrByPath ["pamMount"] false) (attrValues config.security.pam.services);
in
{
options = {
security.pam.mount = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Enable PAM mount system to mount fileystems on user login.
'';
};
extraVolumes = mkOption {
type = types.listOf types.str;
default = [];
description = ''
List of volume definitions for pam_mount.
For more information, visit <link
xlink:href="http://pam-mount.sourceforge.net/pam_mount.conf.5.html" />.
'';
};
};
};
config = mkIf (cfg.enable || anyPamMount) {
environment.systemPackages = [ pkgs.pam_mount ];
environment.etc = [{
target = "security/pam_mount.conf.xml";
source =
let
extraUserVolumes = filterAttrs (n: u: u.cryptHomeLuks != null) config.users.extraUsers;
userVolumeEntry = user: "<volume user=\"${user.name}\" path=\"${user.cryptHomeLuks}\" mountpoint=\"${user.home}\" />\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="0" />
${concatStrings (map userVolumeEntry (attrValues extraUserVolumes))}
${concatStringsSep "\n" cfg.extraVolumes}
<!-- if activated, requires ofl from hxtools to be present -->
<logout wait="0" hup="no" term="no" kill="no" />
<!-- set PATH variable for pam_mount module -->
<path>${pkgs.utillinux}/bin</path>
<!-- create mount point if not present -->
<mkmountpoint enable="1" remove="true" />
<!-- specify the binaries to be called -->
<cryptmount>${pkgs.pam_mount}/bin/mount.crypt %(VOLUME) %(MNTPT)</cryptmount>
<cryptumount>${pkgs.pam_mount}/bin/umount.crypt %(MNTPT)</cryptumount>
<pmvarrun>${pkgs.pam_mount}/bin/pmvarrun -u %(USER) -o %(OPERATION)</pmvarrun>
</pam_mount>
'';
}];
};
}