servers/losurdo/postgresql.nix

   1 { pkgs, lib, config, ... }:
   2 let
   3   inherit (config) networking;
   4   inherit (config.services) postgresql;
   5   inherit (config.users) users;
   6 in
   7 {
   8 imports = [
   9   postgresql/openconcerto.nix
  10 ];
  11 networking.nftables.ruleset = ''
  12   add rule inet filter net2fw tcp dport 5432 counter accept comment "PostgreSQL"
  13 '';
  14 users.groups.acme.members = [ users."postgres".name ];
  15 security.acme.certs."${networking.domain}" = {
  16   postRun = "systemctl reload postgresql";
  17 };
  18 systemd.services.postgresql = {
  19   wants = [ "acme-selfsigned-${networking.domain}.service" "acme-${networking.domain}.service"];
  20   after = [ "acme-selfsigned-${networking.domain}.service" ];
  21 };
  22 services.postgresql = {
  23   enable = true;
  24   package = pkgs.postgresql_9_6;
  25   enableTCPIP = true;
  26   extraConfig = ''
  27     max_connections = 25
  28     max_locks_per_transaction = 256
  29     password_encryption = on # FIXME: replace md5 by scram-sha-256, which requires postfix >= 11
  30     ssl = on
  31     ssl_cert_file = '/var/lib/acme/${networking.domain}/fullchain.pem'
  32     ssl_key_file = '/var/lib/acme/${networking.domain}/key.pem'
  33     unix_socket_permissions = 0770
  34   '';
  35   authentication = lib.mkForce ''
  36     # CONNECTION  DATABASE USER      AUTH  OPTIONS
  37     local         all      postgres  peer  map=admin
  38     local         samerole all       peer  map=user
  39     #local         all      backup    peer
  40   '';
  41   identMap = ''
  42     # MAPNAME  SYSTEM-USERNAME  PG-USERNAME
  43     admin      postgres         postgres
  44     admin      root             postgres
  45     user       /^(.*)$          \1
  46   '';
  47 };
  48 systemd.services.postgresql = {
  49   # DOC: https://wiki.postgresql.org/wiki/Shared_Database_Hosting
  50   postStart = ''
  51     set -eux
  52     # DOC: https://wiki.postgresql.org/wiki/Shared_Database_Hosting#Defining_shared_hosting
  53     $PSQL -d template1 --set ON_ERROR_STOP=1 -f - <<EOF
  54       -- Disallow access to the public schema
  55       -- of individual users' databases by other users
  56       REVOKE ALL ON DATABASE template0 FROM public;
  57       REVOKE ALL ON DATABASE template1 FROM public;
  58       REVOKE ALL ON SCHEMA public FROM public;
  59       GRANT  ALL ON SCHEMA public TO ${postgresql.superUser};
  60       REVOKE ALL ON ALL TABLES IN SCHEMA public FROM public;
  61       GRANT  ALL ON ALL TABLES IN SCHEMA public TO ${postgresql.superUser};
  62
  63       -- Disallow access to database and user names for everyone
  64       REVOKE ALL ON pg_catalog.pg_user         FROM public;
  65       REVOKE ALL ON pg_catalog.pg_roles        FROM public;
  66       REVOKE ALL ON pg_catalog.pg_group        FROM public;
  67       REVOKE ALL ON pg_catalog.pg_authid       FROM public;
  68       REVOKE ALL ON pg_catalog.pg_auth_members FROM public;
  69       REVOKE ALL ON pg_catalog.pg_database     FROM public;
  70       REVOKE ALL ON pg_catalog.pg_tablespace   FROM public;
  71       REVOKE ALL ON pg_catalog.pg_settings     FROM public;
  72     EOF
  73
  74     pg_createdb () {
  75       local db=$1
  76       local owner=''${owner:-$db}
  77       local template=''${template:-template1}
  78       $PSQL -tAc "SELECT 1 FROM pg_catalog.pg_database WHERE datname = '$db'" | grep -q 1 || {
  79         $PSQL -d "$template" -AqtX --set ON_ERROR_STOP=1 -f - <<EOF
  80           CREATE ROLE $owner NOSUPERUSER NOCREATEDB NOCREATEROLE NOINHERIT LOGIN PASSWORD '$pass';
  81           CREATE DATABASE $db WITH OWNER=$owner
  82            ''${encoding:+ENCODING='$encoding'}
  83            ''${lc_collate:+LC_COLLATE='$lc_collate'}
  84            ''${lc_ctype:+LC_CTYPE='$lc_ctype'}
  85            ''${tablespace:+TABLESPACE='$tablespace'}
  86            ''${connection_limit:+CONNECTION LIMIT=$connection_limit}
  87           ;
  88           REVOKE ALL ON DATABASE $db FROM public;
  89     EOF
  90         $PSQL -d $db -AqtX --set ON_ERROR_STOP=1 -f - <<EOF
  91           -- Grant all rights to the public schema in the new database to the main user
  92           GRANT ALL ON SCHEMA public TO $owner WITH GRANT OPTION;
  93     EOF
  94         $PSQL -d "$db" -AqtX --set ON_ERROR_STOP=1 -f -
  95       }
  96     }
  97
  98     pg_adduser () {
  99       local db=$1
 100       local user=$1
 101       $PSQL -tAc "SELECT 1 FROM pg_catalog.pg_roles WHERE rolname='$user'" | grep -q 1 ||
 102       $PSQL -d $db -AqtX --set ON_ERROR_STOP=1 -f - <<EOF
 103         CREATE ROLE $user NOSUPERUSER NOCREATEDB NOCREATEROLE NOINHERIT LOGIN ENCRYPTED PASSWORD '$pass';
 104         GRANT USAGE ON SCHEMA public TO $user;
 105         GRANT CONNECT,TEMPORARY ON DATABASE $db TO $user;
 106     EOF
 107     }
 108   '';
 109 };
 110 }