Archived
feat(ipa/docker): grant docker access via IPA group membership #90
@@ -33,9 +33,6 @@
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];
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users.users.${vars.primaryUser}.extraGroups = [ "docker" ];
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# Grant the IPA domain user docker access via the local group so that
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# `wayne` can manage containers without sudo.
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users.groups.docker.members = [ "wayne" ];
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services.openssh.settings.PermitRootLogin = "yes";
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networking.firewall.allowedTCPPorts = [
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@@ -1,4 +1,4 @@
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{ pkgs, vars, ... }:
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{ lib, pkgs, vars, ... }:
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{
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# virtualisation.docker.enable = true;
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@@ -15,6 +15,12 @@
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# experimental = true;
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# };
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};
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# Pin the docker group GID to match the IPA "docker-access" group so that
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# IPA group membership alone grants access to the Docker socket. Any user
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# whose supplementary groups (resolved by SSSD from IPA) include GID
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# vars.dockerAccessGid will pass the socket group-permission check without
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# any per-host users.groups.docker.members entry.
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users.groups.docker.gid = lib.mkForce vars.dockerAccessGid;
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users.users.${vars.primaryUser}.extraGroups = [ "docker" ];
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environment.systemPackages = with pkgs; [
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docker-compose
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+99
-93
@@ -38,47 +38,113 @@ lib.mkIf enabled {
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networking.domain = lib.mkDefault vars.homeDomain;
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networking.nameservers = lib.mkDefault [ vars.domainControllerIp ];
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security.ipa = {
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enable = true;
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domain = vars.homeDomain;
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inherit realm;
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server = vars.ipaServer;
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certificate = caCertPkg;
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inherit basedn;
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ipaHostname = fqdn;
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offlinePasswords = true;
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cacheCredentials = true;
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security = {
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ipa = {
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enable = true;
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domain = vars.homeDomain;
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inherit realm;
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server = vars.ipaServer;
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certificate = caCertPkg;
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inherit basedn;
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ipaHostname = fqdn;
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offlinePasswords = true;
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cacheCredentials = true;
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};
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# Create the home directory on first login if it doesn't exist yet.
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# IPA users have no pre-created home on the host; without this sshd
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# opens a session to a non-existent directory and resets the connection.
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# lightdm also needs this so the GUI login path can create the home dir
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# if it was not pre-seeded by the tmpfiles rule above (e.g. on first boot
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# before SSSD has resolved the user).
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pam.services = {
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sshd.makeHomeDir = true;
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lightdm.makeHomeDir = true;
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};
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# HM with useUserPackages = true (flake.nix) sets users.users.${ipaUser}.packages,
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# which forces the stub into /etc/passwd. pam_sss.so with the "localusers" flag
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# (added by NixOS when SSSD is enabled) then skips SSSD for any user it finds in
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# local /etc/passwd — including this stub — falling through to pam_unix, which has
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# no password for the stub → sudo auth always fails.
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#
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# Fix: NOPASSWD for the IPA user. The IPA user already authenticated to reach a
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# shell (SSH public key from IPA or Kerberos), so re-prompting via a broken PAM
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# path is security theater on a single-admin homelab.
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sudo.extraRules = [{
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users = [ vars.ipaUser ];
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commands = [{ command = "ALL"; options = [ "NOPASSWD" ]; }];
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}];
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};
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# Fetch SSH public keys from IPA so users can log in with the key stored
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# in their IPA profile rather than needing ~/.ssh/authorized_keys on every
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# host. sss_ssh_authorizedkeys queries SSSD (which queries IPA LDAP).
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#
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# /nix/store is 1775 (group-writable by nixbld). OpenSSH 10.0+ rejects
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# AuthorizedKeysCommand binaries whose path contains any group-writable
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# component, silently skipping the command. Copy to /usr/local/bin (all
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# components root-owned, 755) so the path passes sshd's safety check.
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systemd.tmpfiles.rules = [
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"d /usr/local 0755 root root - -"
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"d /usr/local/bin 0755 root root - -"
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"C+ /usr/local/bin/sss_ssh_authorizedkeys 0555 root root - ${pkgs.sssd}/bin/sss_ssh_authorizedkeys"
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# Pre-create the IPA user's home dir so Home Manager activation succeeds
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# even before their first login. On a fresh system SSSD may not have
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# resolved the user yet — tmpfiles warns and skips in that case (non-fatal),
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# and pam_mkhomedir covers the first-login path as a fallback.
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"d /home/${vars.ipaUser} 0700 ${vars.ipaUser} ${vars.ipaUser} - -"
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];
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systemd = {
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# Fetch SSH public keys from IPA so users can log in with the key stored
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# in their IPA profile rather than needing ~/.ssh/authorized_keys on every
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# host. sss_ssh_authorizedkeys queries SSSD (which queries IPA LDAP).
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#
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# /nix/store is 1775 (group-writable by nixbld). OpenSSH 10.0+ rejects
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# AuthorizedKeysCommand binaries whose path contains any group-writable
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# component, silently skipping the command. Copy to /usr/local/bin (all
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# components root-owned, 755) so the path passes sshd's safety check.
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tmpfiles.rules = [
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"d /usr/local 0755 root root - -"
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"d /usr/local/bin 0755 root root - -"
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"C+ /usr/local/bin/sss_ssh_authorizedkeys 0555 root root - ${pkgs.sssd}/bin/sss_ssh_authorizedkeys"
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# Pre-create the IPA user's home dir so Home Manager activation succeeds
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# even before their first login. On a fresh system SSSD may not have
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# resolved the user yet — tmpfiles warns and skips in that case (non-fatal),
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# and pam_mkhomedir covers the first-login path as a fallback.
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"d /home/${vars.ipaUser} 0700 ${vars.ipaUser} ${vars.ipaUser} - -"
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];
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# security.ipa enables Kerberos (security.krb5) which causes systemd to
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# start auth-rpcgss-module.service and rpc-gssd.service for Kerberos NFS
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# authentication. LXC containers can't load the auth_rpcgss kernel module
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# and don't have /var/lib/nfs/rpc_pipefs, so both services fail.
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#
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# The NixOS IPA module already adds a drop-in for auth-rpcgss-module.service
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# with ConditionPathExists=/etc/krb5.keytab. We use lib.mkForce to win the
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# text conflict and add ConditionVirtualization=!container alongside it so
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# the service is skipped (not failed) in containers that do have a keytab.
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# Same fix for rpc-gssd.service which also fails in containers.
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units = lib.mkIf config.boot.isContainer {
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"auth-rpcgss-module.service" = {
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overrideStrategy = "asDropinIfExists";
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text = lib.mkForce ''
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[Unit]
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ConditionPathExists=
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ConditionPathExists=/etc/krb5.keytab
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ConditionVirtualization=!container
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'';
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};
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# rpc-gssd also has ConditionPathExists from the NixOS IPA module (and an
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# X-Restart-Triggers store path from systemd.nix). Use mkForce to win;
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# omit X-Restart-Triggers since this service is skipped in containers anyway.
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"rpc-gssd.service" = {
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overrideStrategy = "asDropinIfExists";
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text = lib.mkForce ''
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[Unit]
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ConditionPathExists=
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ConditionPathExists=/etc/krb5.keytab
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ConditionVirtualization=!container
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'';
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};
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};
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# home-manager-<user>.service fails on first enrollment because /home/wayne
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# doesn't exist until the user's first login (pam_mkhomedir creates it then).
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# ConditionPathExists makes systemd skip the service (exit 0, condition not
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# met) instead of failing. After first login the dir exists and subsequent
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# rebuilds activate HM normally.
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services."home-manager-${vars.ipaUser}".unitConfig.ConditionPathExists =
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"/home/${vars.ipaUser}";
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};
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services.openssh.extraConfig = ''
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AuthorizedKeysCommand /usr/local/bin/sss_ssh_authorizedkeys %u
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AuthorizedKeysCommandUser nobody
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'';
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# Create the home directory on first login if it doesn't exist yet.
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# IPA users have no pre-created home on the host; without this sshd
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# opens a session to a non-existent directory and resets the connection.
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security.pam.services.sshd.makeHomeDir = true;
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# Host keytab: pre-provisioned on the IPA server, sops-encrypted binary.
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# Placed at /etc/krb5.keytab before SSSD starts so the host authenticates
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# to IPA without running ipa-client-install.
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@@ -92,44 +158,6 @@ lib.mkIf enabled {
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restartUnits = [ "sssd.service" ];
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};
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# security.ipa enables Kerberos (security.krb5) which causes systemd to
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# start auth-rpcgss-module.service and rpc-gssd.service for Kerberos NFS
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# authentication. LXC containers can't load the auth_rpcgss kernel module
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# and don't have /var/lib/nfs/rpc_pipefs, so both services fail.
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#
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# The NixOS IPA module already adds a drop-in for auth-rpcgss-module.service
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# with ConditionPathExists=/etc/krb5.keytab. We use lib.mkForce to win the
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# text conflict and add ConditionVirtualization=!container alongside it so
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# the service is skipped (not failed) in containers that do have a keytab.
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# Same fix for rpc-gssd.service which also fails in containers.
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systemd.units = lib.mkIf config.boot.isContainer {
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"auth-rpcgss-module.service" = {
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overrideStrategy = "asDropinIfExists";
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text = lib.mkForce ''
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[Unit]
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ConditionPathExists=
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ConditionPathExists=/etc/krb5.keytab
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ConditionVirtualization=!container
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'';
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};
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# rpc-gssd also has ConditionPathExists from the NixOS IPA module (and an
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# X-Restart-Triggers store path from systemd.nix). Use mkForce to win;
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# omit X-Restart-Triggers since this service is skipped in containers anyway.
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"rpc-gssd.service" = {
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overrideStrategy = "asDropinIfExists";
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text = lib.mkForce ''
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[Unit]
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ConditionPathExists=
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ConditionPathExists=/etc/krb5.keytab
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ConditionVirtualization=!container
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'';
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};
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};
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# Home Manager config for the IPA primary user, applied on every enrolled
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# host. Manages what IPA doesn't: dotfiles, user-scoped packages, session
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# variables. Switch-nix/Test-nix/buildImage are system-wide (configuration.nix)
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# so they don't need to be repeated here.
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# NixOS requires isNormalUser/isSystemUser + group on any entry in
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# users.users. HM with useUserPackages = true (set in flake.nix) adds a stub
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# entry for each HM user so it can install packages to
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@@ -137,15 +165,6 @@ lib.mkIf enabled {
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# With security.ipa setting "passwd: sss files" in nsswitch, SSSD's IPA entry
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# takes priority for NSS lookups — this local stub is only a fallback when
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# SSSD is unreachable (at which point auth fails anyway).
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# HM with useUserPackages = true (flake.nix) sets users.users.${ipaUser}.packages,
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# which forces the stub into /etc/passwd. pam_sss.so with the "localusers" flag
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# (added by NixOS when SSSD is enabled) then skips SSSD for any user it finds in
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# local /etc/passwd — including this stub — falling through to pam_unix, which has
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# no password for the stub → sudo auth always fails.
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#
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# Fix: NOPASSWD for the IPA user. The IPA user already authenticated to reach a
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# shell (SSH public key from IPA or Kerberos), so re-prompting via a broken PAM
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# path is security theater on a single-admin homelab.
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users.users.${vars.ipaUser} = {
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isNormalUser = true;
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group = "users";
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@@ -153,19 +172,6 @@ lib.mkIf enabled {
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createHome = false;
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};
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# home-manager-<user>.service fails on first enrollment because /home/wayne
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# doesn't exist until the user's first login (pam_mkhomedir creates it then).
|
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# ConditionPathExists makes systemd skip the service (exit 0, condition not
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# met) instead of failing. After first login the dir exists and subsequent
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# rebuilds activate HM normally.
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systemd.services."home-manager-${vars.ipaUser}".unitConfig.ConditionPathExists =
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"/home/${vars.ipaUser}";
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security.sudo.extraRules = [{
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users = [ vars.ipaUser ];
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commands = [{ command = "ALL"; options = [ "NOPASSWD" ]; }];
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}];
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# Home Manager config for the IPA primary user, applied on every enrolled
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# host. Manages what IPA doesn't: dotfiles, user-scoped packages, session
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# variables. Switch-nix/Test-nix/buildImage are system-wide (configuration.nix)
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@@ -85,6 +85,12 @@
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# that IPA itself doesn't cover: dotfiles, user packages, session variables.
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ipaUser = "wayne";
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# GID of the IPA "docker-access" group (GID 50010 on the IPA server).
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# The local "docker" group is pinned to this GID on every host that runs
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# Docker so that IPA group membership alone grants docker socket access -
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# no per-host users.groups.docker.members entry for the IPA user needed.
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dockerAccessGid = 50010;
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# HA file server cluster
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# LAN IPs (vmbr0 / ens18) — client-facing: iSCSI initiators, NFS, management.
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# Storage IPs (vmbr1 / ens19) — isolated internal bridge, used for DRBD
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