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|
{ lib, pkgs, config, ... }:
let
cfg = config.myServices.databases.postgresql;
in {
options.myServices.databases = {
postgresql = {
enable = lib.mkOption {
default = false;
example = true;
description = "Whether to enable postgresql database";
type = lib.types.bool;
};
package = lib.mkOption {
type = lib.types.package;
default = pkgs.postgresql;
description = ''
Postgresql package to use.
'';
};
ldapConfig = lib.mkOption {
description = "LDAP configuration to allow PAM identification via LDAP";
type = lib.types.submodule {
options = {
host = lib.mkOption { type = lib.types.str; };
base = lib.mkOption { type = lib.types.str; };
dn = lib.mkOption { type = lib.types.str; };
password = lib.mkOption { type = lib.types.str; };
filter = lib.mkOption { type = lib.types.str; };
};
};
};
replicationLdapConfig = lib.mkOption {
description = "LDAP configuration to allow replication";
type = lib.types.submodule {
options = {
host = lib.mkOption { type = lib.types.str; };
base = lib.mkOption { type = lib.types.str; };
dn = lib.mkOption { type = lib.types.str; };
password = lib.mkOption { type = lib.types.str; };
};
};
};
authorizedHosts = lib.mkOption {
default = {};
description = "Hosts to allow connections from";
type = lib.types.attrsOf (lib.types.listOf (lib.types.submodule {
options = {
method = lib.mkOption {
default = "md5";
type = lib.types.str;
};
username = lib.mkOption {
default = "all";
type = lib.types.str;
};
database = lib.mkOption {
default = "all";
type = lib.types.str;
};
ip4 = lib.mkOption {
default = [];
type = lib.types.listOf lib.types.str;
};
ip6 = lib.mkOption {
default = [];
type = lib.types.listOf lib.types.str;
};
};
}));
};
replicationHosts = lib.mkOption {
default = {};
description = "Hosts to allow replication from";
type = lib.types.attrsOf (lib.types.submodule {
options = {
ip4 = lib.mkOption {
type = lib.types.listOf lib.types.str;
};
ip6 = lib.mkOption {
type = lib.types.listOf lib.types.str;
};
};
});
};
# Output variables
socketsDir = lib.mkOption {
type = lib.types.path;
default = "/run/postgresql";
description = ''
The directory where Postgresql puts sockets.
'';
readOnly = true;
};
};
};
config = lib.mkIf cfg.enable {
services.borgBackup.profiles.global.ignoredPaths = [
"postgresql"
];
networking.firewall.allowedTCPPorts = [ 5432 ];
security.acme.certs."postgresql" = {
group = "postgres";
domain = "db-1.immae.eu";
postRun = ''
systemctl reload postgresql.service
'';
};
systemd.services.postgresql.serviceConfig = {
SupplementaryGroups = "keys";
ExecStartPre = [ ("+" + (pkgs.writeShellScript "postgresql-fix-cert" ''
# postgresql complains:
# private key file "${config.security.acme.certs.postgresql.directory}/key.pem" must be owned by the database user or root
cp -f "${config.security.acme.certs.postgresql.directory}/key.pem" "${config.services.postgresql.dataDir}/key.pem"
chown postgres:postgres "${config.services.postgresql.dataDir}/key.pem"
chmod go-r "${config.services.postgresql.dataDir}/key.pem"
'')) ];
};
systemd.services.postgresql.postStart = lib.mkAfter ''
# This line is already defined in 19.09
PSQL="psql --port=5432"
${builtins.concatStringsSep "\n" (lib.mapAttrsToList (role: _: ''
$PSQL -tAc "SELECT 1 FROM pg_roles WHERE rolname='${role}'" \
| grep -q 1 \
|| $PSQL -tAc 'CREATE USER "${role}" WITH REPLICATION'
'') cfg.replicationHosts)}
${builtins.concatStringsSep "\n" (lib.mapAttrsToList (role: _:
let
sname = builtins.replaceStrings ["-"] ["_"] role;
in
''
$PSQL -tAc "SELECT 1 FROM pg_replication_slots WHERE slot_name='${sname}'" \
| grep -q 1 \
|| $PSQL -tAc "SELECT * FROM pg_create_physical_replication_slot('${sname}')"
'') cfg.replicationHosts)}
'';
services.postgresql = {
enable = true;
package = cfg.package;
enableTCPIP = true;
checkConfig = false;
logLinePrefix = "%h %q%u@%d "; # Default: '%m [%p] ', already stored independently by journald. %h needed for fail2ban
settings = {
max_connections = 300;
wal_level = "logical";
shared_buffers = "512MB";
work_mem = "10MB";
max_wal_size = "1GB";
min_wal_size = "80MB";
log_timezone = "Europe/Paris";
datestyle = "iso, mdy";
timezone = "Europe/Paris";
lc_messages = "en_US.UTF-8";
lc_monetary = "en_US.UTF-8";
lc_numeric = "en_US.UTF-8";
lc_time = "en_US.UTF-8";
default_text_search_config = "pg_catalog.english";
# this introduces a small delay before storing on disk, but
# makes it order of magnitudes quicker
synchronous_commit = "off";
ssl = "on";
ssl_cert_file = "${config.security.acme.certs.postgresql.directory}/fullchain.pem";
ssl_key_file = "${config.services.postgresql.dataDir}/key.pem";
};
authentication = let
hosts = builtins.concatStringsSep "\n" (
lib.lists.flatten (lib.mapAttrsToList (k: vs: map (v:
map (ip6: "hostssl ${v.database} ${v.username} ${ip6} ${v.method}") v.ip6
++ map (ip4: "hostssl ${v.database} ${v.username} ${ip4}/32 ${v.method}") v.ip4
) vs) cfg.authorizedHosts
));
replication = builtins.concatStringsSep "\n" (
lib.lists.flatten (lib.mapAttrsToList (k: v:
map (ip6: "hostssl replication ${k} ${ip6}/128 pam pamservice=postgresql_replication") v.ip6
++ map (ip4: "hostssl replication ${k} ${ip4}/32 pam pamservice=postgresql_replication") v.ip4
) cfg.replicationHosts
));
in ''
local all postgres ident
local all all md5
${hosts}
hostssl all all all pam
${replication}
'';
};
secrets.keys = {
"postgresql/pam" = {
permissions = "0400";
group = "postgres";
user = "postgres";
text = with cfg.ldapConfig; ''
host ${host}
base ${base}
binddn ${dn}
bindpw ${password}
pam_filter ${filter}
ssl start_tls
'';
};
"postgresql/pam_replication" = {
permissions = "0400";
group = "postgres";
user = "postgres";
text = with cfg.replicationLdapConfig; ''
host ${host}
base ${base}
binddn ${dn}
bindpw ${password}
pam_login_attribute cn
ssl start_tls
'';
};
};
security.pam.services = let
pam_ldap = "${pkgs.pam_ldap}/lib/security/pam_ldap.so";
in {
postgresql = {
text = ''
auth required ${pam_ldap} config=${config.secrets.fullPaths."postgresql/pam"}
account required ${pam_ldap} config=${config.secrets.fullPaths."postgresql/pam"}
'';
};
postgresql_replication = {
text = ''
auth required ${pam_ldap} config=${config.secrets.fullPaths."postgresql/pam_replication"}
account required ${pam_ldap} config=${config.secrets.fullPaths."postgresql/pam_replication"}
'';
};
};
};
}
|
