pvv-nixos-config/hosts/bekkalokk/services/idp-simplesamlphp/default.nix

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{ config, pkgs, lib, ... }:
let
pwAuthScript = pkgs.writeShellApplication {
name = "pwauth";
runtimeInputs = with pkgs; [ coreutils heimdal ];
text = ''
read -r user1
user2="$(echo -n "$user1" | tr -c -d '0123456789abcdefghijklmnopqrstuvwxyz')"
if test "$user1" != "$user2"
then
read -r _
exit 2
fi
kinit --password-file=STDIN "''${user1}@PVV.NTNU.NO" >/dev/null 2>/dev/null
kdestroy >/dev/null 2>/dev/null
'';
};
package = pkgs.simplesamlphp.override {
extra_files = {
# NOTE: Using self signed certificate created 30. march 2024, with command:
# openssl req -newkey rsa:4096 -new -x509 -days 365 -nodes -out idp.crt -keyout idp.pem
"metadata/saml20-idp-hosted.php" = pkgs.writeText "saml20-idp-remote.php" ''
<?php
$metadata['https://idp.pvv.ntnu.no/'] = array(
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'host' => '__DEFAULT__',
'privatekey' => '${config.sops.secrets."idp/privatekey".path}',
'certificate' => '${./idp.crt}',
'auth' => 'pwauth',
);
?>
'';
"metadata/saml20-sp-remote.php" = pkgs.writeText "saml20-sp-remote.php" ''
<?php
${ lib.pipe config.services.idp.sp-remote-metadata [
(map (url: ''
$metadata['${url}'] = [
'SingleLogoutService' => [
[
'Binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
'Location' => '${url}module.php/saml/sp/saml2-logout.php/default-sp',
],
[
'Binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:SOAP',
'Location' => '${url}module.php/saml/sp/saml2-logout.php/default-sp',
],
],
'AssertionConsumerService' => [
[
'Binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST',
'Location' => '${url}module.php/saml/sp/saml2-acs.php/default-sp',
'index' => 0,
],
[
'Binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Artifact',
'Location' => '${url}module.php/saml/sp/saml2-acs.php/default-sp',
'index' => 1,
],
],
];
''))
(lib.concatStringsSep "\n")
]}
?>
'';
"config/authsources.php" = pkgs.writeText "idp-authsources.php" ''
<?php
$config = array(
'admin' => array(
'core:AdminPassword'
),
'pwauth' => array(
'authpwauth:PwAuth',
'pwauth_bin_path' => '${lib.getExe pwAuthScript}',
'mail_domain' => '@pvv.ntnu.no',
),
);
?>
'';
"config/config.php" = pkgs.runCommandLocal "simplesamlphp-config.php" { } ''
cp ${./config.php} "$out"
substituteInPlace "$out" \
--replace '$SAML_COOKIE_SECURE' 'true' \
--replace '$SAML_COOKIE_SALT' 'file_get_contents("${config.sops.secrets."idp/cookie_salt".path}")' \
--replace '$SAML_ADMIN_NAME' '"Drift"' \
--replace '$SAML_ADMIN_EMAIL' '"drift@pvv.ntnu.no"' \
--replace '$SAML_ADMIN_PASSWORD' 'file_get_contents("${config.sops.secrets."idp/admin_password".path}")' \
--replace '$SAML_TRUSTED_DOMAINS' 'array( "idp.pvv.ntnu.no" )' \
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--replace '$SAML_DATABASE_DSN' '"pgsql:host=postgres.pvv.ntnu.no;port=5432;dbname=idp"' \
--replace '$SAML_DATABASE_USERNAME' '"idp"' \
--replace '$SAML_DATABASE_PASSWORD' 'file_get_contents("${config.sops.secrets."idp/postgres_password".path}")' \
--replace '$CACHE_DIRECTORY' '/var/cache/idp'
'';
"modules/authpwauth/src/Auth/Source/PwAuth.php" = ./authpwauth.php;
};
};
in
{
options.services.idp.sp-remote-metadata = lib.mkOption {
type = with lib.types; listOf str;
default = [ ];
description = ''
List of urls point to (simplesamlphp) service profiders, which the idp should trust.
:::{.note}
Make sure the url ends with a `/`
:::
'';
};
config = {
sops.secrets = {
"idp/privatekey" = {
owner = "idp";
group = "idp";
mode = "0770";
};
"idp/admin_password" = {
owner = "idp";
group = "idp";
};
"idp/postgres_password" = {
owner = "idp";
group = "idp";
};
"idp/cookie_salt" = {
owner = "idp";
group = "idp";
};
};
users.groups."idp" = { };
users.users."idp" = {
description = "PVV Identity Provider Service User";
group = "idp";
createHome = false;
isSystemUser = true;
};
systemd.tmpfiles.settings."10-idp" = {
"/var/cache/idp".d = {
user = "idp";
group = "idp";
mode = "0770";
};
"/var/lib/idp".d = {
user = "idp";
group = "idp";
mode = "0770";
};
};
services.phpfpm.pools.idp = {
user = "idp";
group = "idp";
settings = let
listenUser = config.services.nginx.user;
listenGroup = config.services.nginx.group;
in {
"pm" = "dynamic";
"pm.max_children" = 32;
"pm.max_requests" = 500;
"pm.start_servers" = 2;
"pm.min_spare_servers" = 2;
"pm.max_spare_servers" = 4;
"listen.owner" = listenUser;
"listen.group" = listenGroup;
"catch_workers_output" = true;
"php_admin_flag[log_errors]" = true;
# "php_admin_value[error_log]" = "stderr";
};
};
services.nginx.virtualHosts."idp.pvv.ntnu.no" = {
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forceSSL = true;
enableACME = true;
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kTLS = true;
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root = "${package}/share/php/simplesamlphp/public";
locations = {
# based on https://simplesamlphp.org/docs/stable/simplesamlphp-install.html#configuring-nginx
"/" = {
alias = "${package}/share/php/simplesamlphp/public/";
index = "index.php";
extraConfig = ''
location ~ ^/(?<phpfile>.+?\.php)(?<pathinfo>/.*)?$ {
include ${pkgs.nginx}/conf/fastcgi_params;
fastcgi_pass unix:${config.services.phpfpm.pools.idp.socket};
fastcgi_param SCRIPT_FILENAME ${package}/share/php/simplesamlphp/public/$phpfile;
fastcgi_param SCRIPT_NAME /$phpfile;
fastcgi_param PATH_INFO $pathinfo if_not_empty;
}
'';
};
"^~ /simplesaml/".extraConfig = ''
rewrite ^/simplesaml/(.*)$ /$1 redirect;
return 404;
'';
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};
};
};
}