WIP: set up heimdal-openldap-sasl stack
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Øystein Tveit
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# Tracking document for new PVV kerberos auth stack
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<div align="center">
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Bensinstasjon på heimdal
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</div>
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### TODO:
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- [ ] setup heimdal
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- [x] ensure running with systemd
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- [x] compile smbk5pwd (part of openldap)
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- [ ] set `modify -a -disallow-all-tix,requires-pre-auth default` declaratively
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- [ ] fully initialize PVV.NTNU.NO
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- [x] `kadmin -l init PVV.NTNU.NO`
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- [x] add oysteikt/admin@PVV.NTNU.NO principal
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- [x] add oysteikt@PVV.NTNU.NO principal
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- [ ] add krbtgt@PVV.NTNU.NO principal?
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- why is this needed, and where is it documented?
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- `kadmin check` seems to work under sudo?
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- Fix FQDN: https://github.com/NixOS/nixpkgs/issues/94011
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https://github.com/NixOS/nixpkgs/issues/261269
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- [ ] setup cyrus sasl
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- [x] ensure running with systemd
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- [x] verify GSSAPI support plugin is installed
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- `nix-shell -p cyrus_sasl --command pluginviewer`
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- [x] create "host/localhost@PVV.NTNU.NO" and export to keytab
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- [x] verify cyrus sasl is able to talk to heimdal
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- `sudo testsaslauthd -u oysteikt -p <password>`
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- [ ] provide ldap principal to cyrus sasl through keytab
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- [ ] setup openldap
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- [x] ensure running with systemd
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- [ ] verify openldap is able to talk to cyrus sasl
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- [ ] create user for oysteikt in openldap
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- [ ] authenticate openldap login through sasl
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- does this require creating an ldap user?
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- [ ] fix smbk5pwd integration
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- [x] add smbk5pwd schemas to openldap
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- [x] create openldap db for smbk5pwd with overlays
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- [ ] test to ensure that user sync is working
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- [ ] test as user source (replace passwd)
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- [ ] test as PAM auth source
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- [ ] test as auth source for 3rd party appliation
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- [ ] Set up ldap administration panel
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- Doesn't seem like there are many good ones out there. Maybe phpLDAPAdmin?
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- [ ] Set up kerberos SRV DNS entry
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### Information and URLS
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- OpenLDAP SASL: https://www.openldap.org/doc/admin24/sasl.html
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- Use a keytab: https://kb.iu.edu/d/aumh
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- 2 ways for openldap to auth: https://security.stackexchange.com/questions/65093/how-to-test-ldap-that-authenticates-with-kerberos
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- Cyrus guide OpenLDAP + SASL + GSSAPI: https://www.cyrusimap.org/sasl/sasl/faqs/openldap-sasl-gssapi.html
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- Configuring GSSAPI and Cyrus SASL: https://web.mit.edu/darwin/src/modules/passwordserver_sasl/cyrus_sasl/doc/gssapi.html
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- PVV Kerberos docs: https://wiki.pvv.ntnu.no/wiki/Drift/Kerberos
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- OpenLDAP smbk5pwd source: https://git.openldap.org/nivanova/openldap/-/tree/master/contrib/slapd-modules/smbk5pwd
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- saslauthd(8): https://linux.die.net/man/8/saslauthd
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@ -5,6 +5,10 @@
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./hardware-configuration.nix
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../../base.nix
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../../misc/metrics-exporters.nix
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./services/heimdal.nix
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./services/openldap.nix
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./services/cyrus-sasl.nix
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];
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# buskerud does not support efi?
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@ -13,6 +17,9 @@
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boot.loader.grub.enable = true;
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boot.loader.grub.device = "/dev/sda";
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# resolved messes up FQDN coming from nscd
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services.resolved.enable = false;
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networking.hostName = "dagali";
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networking.search = [ "pvv.ntnu.no" "pvv.org" ];
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networking.nameservers = [ "129.241.0.200" "129.241.0.201" ];
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@ -0,0 +1,21 @@
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{ config, ... }:
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let
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cfg = config.services.saslauthd;
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in
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{
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# TODO: This is seemingly required for openldap to authenticate
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# against kerberos, but I have no idea how to configure it as
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# such. Does it need a keytab? There's a binary "testsaslauthd"
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# that follows with `pkgs.cyrus_sasl` that might be useful.
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services.saslauthd = {
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enable = true;
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mechanism = "kerberos5";
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config = ''
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mech_list: gs2-krb5 gssapi
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keytab: /etc/krb5.keytab
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'';
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};
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# TODO: maybe the upstream module should consider doing this?
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environment.systemPackages = [ cfg.package ];
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}
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{ config, pkgs, lib, ... }:
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let
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realm = "PVV.NTNU.NO";
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cfg = config.security.krb5;
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in
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{
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security.krb5 = {
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enable = true;
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# NOTE: This has a small edit that moves an include header to $dev/include.
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# It is required in order to build smbk5pwd, because of some nested includes.
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# We should open an issue upstream (heimdal, not nixpkgs), but this patch
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# will do for now.
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# package = pkgs.callPackage ./package.nix {
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# inherit (pkgs.apple_sdk.frameworks)
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# CoreFoundation Security SystemConfiguration;
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# };
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package = pkgs.heimdal.overrideAttrs (prev: {
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postInstall = prev.postInstall + ''
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cp include/heim_threads.h $dev/include
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'';
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});
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settings = {
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# logging.kdc = "CONSOLE";
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realms.${realm} = {
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admin_server = "dagali.pvv.ntnu.no";
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kdc = [ "localhost" ];
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};
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kadmin.default_keys = lib.concatStringsSep " " [
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"aes256-cts-hmac-sha1-96:pw-salt"
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"aes128-cts-hmac-sha1-96:pw-salt"
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];
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libdefaults.default_etypes = lib.concatStringsSep " " [
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"aes256-cts-hmac-sha1-96"
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"aes128-cts-hmac-sha1-96"
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];
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libdefaults = {
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default_realm = realm;
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};
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domain_realm = {
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"pvv.ntnu.no" = realm;
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".pvv.ntnu.no" = realm;
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};
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logging = {
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kdc = "SYSLOG:DEBUG:AUTH";
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admin_server = "SYSLOG:DEBUG:AUTH";
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default = "SYSLOG:DEBUG:AUTH";
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};
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};
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};
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services.kerberos_server = {
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enable = true;
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settings = {
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realms.${realm} = {
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dbname = "/var/heimdal/heimdal";
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mkey = "/var/heimdal/mkey";
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};
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# kadmin.default_keys = lib.concatStringsSep " " [
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# "aes256-cts-hmac-sha1-96:pw-salt"
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# "aes128-cts-hmac-sha1-96:pw-salt"
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# ];
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# libdefaults.default_etypes = lib.concatStringsSep " " [
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# "aes256-cts-hmac-sha1-96"
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# "aes128-cts-hmac-sha1-96"
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# ];
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# password_quality.min_length = 8;
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};
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};
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}
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@ -0,0 +1,121 @@
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{ config, pkgs, lib, ... }:
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{
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services.openldap = let
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dn = "dc=kerberos,dc=pvv,dc=ntnu,dc=no";
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cfg = config.services.openldap;
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heimdal = config.security.krb5.package;
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in {
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enable = true;
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# NOTE: this is a custom build of openldap with support for
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# perl and kerberos.
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package = pkgs.openldap.overrideAttrs (prev: {
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# https://github.com/openldap/openldap/blob/master/configure
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configureFlags = prev.configureFlags ++ [
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# Connect to slapd via UNIX socket
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"--enable-local"
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# Cyrus SASL
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"--enable-spasswd"
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# Reverse hostname lookups
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"--enable-rlookups"
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# perl
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"--enable-perl"
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];
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buildInputs = prev.buildInputs ++ [
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pkgs.perl
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# NOTE: do not upstream this, it might not work with
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# MIT in the same way
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heimdal
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];
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extraContribModules = prev.extraContribModules ++ [
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# https://git.openldap.org/openldap/openldap/-/tree/master/contrib/slapd-modules
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"smbk5pwd"
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];
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});
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settings = {
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attrs = {
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olcLogLevel = [ "stats" "config" "args" ];
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# olcAuthzRegexp = ''
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# gidNumber=.*\\\+uidNumber=0,cn=peercred,cn=external,cn=auth
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# "uid=heimdal,${dn2}"
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# '';
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# olcSaslSecProps = "minssf=0";
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};
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children = {
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"cn=schema".includes = let
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# NOTE: needed for smbk5pwd.so module
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schemaToLdif = name: path: pkgs.runCommandNoCC name {
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buildInputs = with pkgs; [ schema2ldif ];
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} ''
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schema2ldif "${path}" > $out
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'';
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hdb-ldif = schemaToLdif "hdb.ldif" "${heimdal.src}/lib/hdb/hdb.schema";
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samba-ldif = schemaToLdif "samba.ldif" "${heimdal.src}/tests/ldap/samba.schema";
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in [
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"${cfg.package}/etc/schema/core.ldif"
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"${cfg.package}/etc/schema/cosine.ldif"
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"${cfg.package}/etc/schema/nis.ldif"
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"${cfg.package}/etc/schema/inetorgperson.ldif"
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"${hdb-ldif}"
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"${samba-ldif}"
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];
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# NOTE: installation of smbk5pwd.so module
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# https://git.openldap.org/openldap/openldap/-/tree/master/contrib/slapd-modules/smbk5pwd
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"cn=module{0}".attrs = {
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objectClass = [ "olcModuleList" ];
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olcModuleLoad = [ "${cfg.package}/lib/modules/smbk5pwd.so" ];
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};
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# NOTE: activation of smbk5pwd.so module for {1}mdb
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"olcOverlay={0}smbk5pwd,olcDatabase={1}mdb".attrs = {
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objectClass = [ "olcOverlayConfig" "olcSmbK5PwdConfig" ];
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olcOverlay = "{0}smbk5pwd";
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olcSmbK5PwdEnable = [ "krb5" "samba" ];
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olcSmbK5PwdMustChange = toString (60 * 60 * 24 * 30);
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};
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"olcDatabase={1}mdb".attrs = {
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objectClass = [ "olcDatabaseConfig" "olcMdbConfig" ];
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olcDatabase = "{1}mdb";
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olcSuffix = dn;
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# TODO: PW is supposed to be a secret, but it's probably fine for testing
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olcRootDN = "cn=admin,${dn}";
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# TODO: replace with proper secret
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olcRootPW.path = pkgs.writeText "olcRootPW" "pass";
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olcDbDirectory = "/var/lib/openldap/test-smbk5pwd-db";
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olcDbIndex = "objectClass eq";
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olcAccess = [
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''{0}to attrs=userPassword,shadowLastChange
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by dn.exact=cn=admin,${dn} write
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by self write
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by anonymous auth
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by * none''
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''{1}to dn.base=""
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by * read''
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/* allow read on anything else */
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# ''{2}to *
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# by cn=admin,${dn} write by dn.exact=gidNumber=0+uidNumber=0+cn=peercred,cn=external write
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# by * read''
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];
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};
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};
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};
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};
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}
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