machines/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   map (eta: (import postgresql/openconcerto.nix) eta) [
  10     {db = "openconcerto1";}
  11     {db = "openconcerto2";}
  12     {db = "lbec";}
  13     {db = "lbm";}
  14   ];
  15 networking.nftables.ruleset = ''
  16   add rule inet filter net2fw tcp dport 5432 counter accept comment "PostgreSQL"
  17 '';
  18 users.groups.acme.members = [ users."postgres".name ];
  19 security.acme.certs."${networking.domain}" = {
  20   postRun = "systemctl reload postgresql";
  21 };
  22 systemd.services.postgresql = {
  23   wants = [ "acme-selfsigned-${networking.domain}.service" "acme-${networking.domain}.service"];
  24   after = [ "acme-selfsigned-${networking.domain}.service" ];
  25 };
  26 services.postgresql = {
  27   enable = true;
  28   package = pkgs.postgresql_9_6;
  29   enableTCPIP = true;
  30   extraConfig = ''
  31     # ZFS is Copy on Write (CoW). As a result, it’s not possible
  32     # to have a torn page because a page can’t be partially written
  33     # without reverting to the previous copy.
  34     full_page_writes = off
  35     log_connections = true
  36     log_disconnections = true
  37     log_hostname = false
  38     max_connections = 25
  39     max_locks_per_transaction = 1024
  40     password_encryption = on # FIXME: replace md5 by scram-sha-256, which requires postfix >= 11
  41     ssl = on
  42     ssl_cert_file = '/var/lib/acme/${networking.domain}/fullchain.pem'
  43     ssl_key_file = '/var/lib/acme/${networking.domain}/key.pem'
  44     unix_socket_permissions = 0770
  45   '';
  46   authentication = lib.mkForce ''
  47     # CONNECTION  DATABASE USER      AUTH  OPTIONS
  48     local         all      postgres  peer  map=admin
  49     local         samerole all       peer  map=user
  50     #local         all      backup    peer
  51   '';
  52   identMap = ''
  53     # MAPNAME  SYSTEM-USERNAME  PG-USERNAME
  54     admin      postgres         postgres
  55     admin      root             postgres
  56     # Commented to prefer explicit auth
  57     # to handle revocation without droping the user yet
  58     #user       /^(.*)$          \1
  59   '';
  60 };
  61 systemd.services.postgresql = {
  62   # DOC: https://wiki.postgresql.org/wiki/Shared_Database_Hosting
  63   postStart = ''
  64     set -eux
  65     # DOC: https://wiki.postgresql.org/wiki/Shared_Database_Hosting#Defining_shared_hosting
  66     $PSQL -d template1 --set ON_ERROR_STOP=1 -f - <<EOF
  67       -- Disallow access to the public schema
  68       -- of individual users' databases by other users
  69       REVOKE ALL ON DATABASE template0 FROM public;
  70       REVOKE ALL ON DATABASE template1 FROM public;
  71       REVOKE ALL ON SCHEMA public FROM public;
  72       GRANT  ALL ON SCHEMA public TO ${postgresql.superUser};
  73       REVOKE ALL ON ALL TABLES IN SCHEMA public FROM public;
  74       GRANT  ALL ON ALL TABLES IN SCHEMA public TO ${postgresql.superUser};
  75
  76       -- Disallow access to database and user names for everyone
  77       REVOKE ALL ON pg_catalog.pg_user         FROM public;
  78       REVOKE ALL ON pg_catalog.pg_group        FROM public;
  79       REVOKE ALL ON pg_catalog.pg_authid       FROM public;
  80       REVOKE ALL ON pg_catalog.pg_auth_members FROM public;
  81       REVOKE ALL ON pg_catalog.pg_settings     FROM public;
  82       -- The following must have SELECT reallowed if pg_dump is allowed
  83       REVOKE ALL ON pg_catalog.pg_roles        FROM public;
  84       REVOKE ALL ON pg_catalog.pg_database     FROM public;
  85       REVOKE ALL ON pg_catalog.pg_tablespace   FROM public;
  86     EOF
  87
  88     pg_createdb () {
  89       local db=$1
  90       local owner=''${owner:-$db}
  91       local template=''${template:-template1}
  92       $PSQL -tAc "SELECT 1 FROM pg_catalog.pg_database WHERE datname = '$db'" | grep -q 1 || {
  93         $PSQL -d "$template" -AqtX --set ON_ERROR_STOP=1 -f - <<EOF
  94           CREATE ROLE $owner NOSUPERUSER NOCREATEDB NOCREATEROLE NOINHERIT LOGIN PASSWORD '$pass';
  95           CREATE DATABASE $db WITH OWNER=$owner
  96            ''${encoding:+ENCODING='$encoding'}
  97            ''${lc_collate:+LC_COLLATE='$lc_collate'}
  98            ''${lc_ctype:+LC_CTYPE='$lc_ctype'}
  99            ''${tablespace:+TABLESPACE='$tablespace'}
 100            ''${connection_limit:+CONNECTION LIMIT=$connection_limit}
 101           ;
 102           REVOKE ALL ON DATABASE $db FROM public;
 103     EOF
 104         $PSQL -d $db -AqtX --set ON_ERROR_STOP=1 -f - <<EOF
 105           -- Grant all rights to the public schema in the new database to the main user
 106           GRANT ALL ON SCHEMA public TO $owner WITH GRANT OPTION;
 107     EOF
 108         $PSQL -d "$db" -AqtX --set ON_ERROR_STOP=1 -f -
 109       }
 110     }
 111
 112     pg_adduser () {
 113       local db=$1
 114       local user=$2
 115       $PSQL -tAc "SELECT 1 FROM pg_catalog.pg_roles WHERE rolname='$user'" | grep -q 1 ||
 116       $PSQL -d $db -AqtX --set ON_ERROR_STOP=1 -f - <<EOF
 117         CREATE ROLE $user NOSUPERUSER NOCREATEDB NOCREATEROLE NOINHERIT LOGIN ENCRYPTED PASSWORD '$pass';
 118         GRANT USAGE ON SCHEMA public TO $user;
 119         GRANT CONNECT,TEMPORARY ON DATABASE $db TO $user;
 120     EOF
 121     }
 122   '';
 123 };
 124 }