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nixpkgs/nixos/modules/services/mail/dovecot.nix

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Nix

{ options, config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.dovecot2;
dovecotPkg = pkgs.dovecot;
baseDir = "/run/dovecot2";
stateDir = "/var/lib/dovecot";
dovecotConf = concatStrings [
''
base_dir = ${baseDir}
protocols = ${concatStringsSep " " cfg.protocols}
sendmail_path = /run/wrappers/bin/sendmail
# defining mail_plugins must be done before the first protocol {} filter because of https://doc.dovecot.org/configuration_manual/config_file/config_file_syntax/#variable-expansion
mail_plugins = $mail_plugins ${concatStringsSep " " cfg.mailPlugins.globally.enable}
''
(
concatStringsSep "\n" (
mapAttrsToList (
protocol: plugins: ''
protocol ${protocol} {
mail_plugins = $mail_plugins ${concatStringsSep " " plugins.enable}
}
''
) cfg.mailPlugins.perProtocol
)
)
(
if cfg.sslServerCert == null then ''
ssl = no
disable_plaintext_auth = no
'' else ''
ssl_cert = <${cfg.sslServerCert}
ssl_key = <${cfg.sslServerKey}
${optionalString (cfg.sslCACert != null) ("ssl_ca = <" + cfg.sslCACert)}
ssl_dh = <${config.security.dhparams.params.dovecot2.path}
disable_plaintext_auth = yes
''
)
''
default_internal_user = ${cfg.user}
default_internal_group = ${cfg.group}
${optionalString (cfg.mailUser != null) "mail_uid = ${cfg.mailUser}"}
${optionalString (cfg.mailGroup != null) "mail_gid = ${cfg.mailGroup}"}
mail_location = ${cfg.mailLocation}
maildir_copy_with_hardlinks = yes
pop3_uidl_format = %08Xv%08Xu
auth_mechanisms = plain login
service auth {
user = root
}
''
(
optionalString cfg.enablePAM ''
userdb {
driver = passwd
}
passdb {
driver = pam
args = ${optionalString cfg.showPAMFailure "failure_show_msg=yes"} dovecot2
}
''
)
(
optionalString (cfg.sieveScripts != {}) ''
plugin {
${concatStringsSep "\n" (mapAttrsToList (to: from: "sieve_${to} = ${stateDir}/sieve/${to}") cfg.sieveScripts)}
}
''
)
(
optionalString (cfg.mailboxes != {}) ''
namespace inbox {
inbox=yes
${concatStringsSep "\n" (map mailboxConfig (attrValues cfg.mailboxes))}
}
''
)
(
optionalString cfg.enableQuota ''
service quota-status {
executable = ${dovecotPkg}/libexec/dovecot/quota-status -p postfix
inet_listener {
port = ${cfg.quotaPort}
}
client_limit = 1
}
plugin {
quota_rule = *:storage=${cfg.quotaGlobalPerUser}
quota = count:User quota # per virtual mail user quota
quota_status_success = DUNNO
quota_status_nouser = DUNNO
quota_status_overquota = "552 5.2.2 Mailbox is full"
quota_grace = 10%%
quota_vsizes = yes
}
''
)
cfg.extraConfig
];
modulesDir = pkgs.symlinkJoin {
name = "dovecot-modules";
paths = map (pkg: "${pkg}/lib/dovecot") ([ dovecotPkg ] ++ map (module: module.override { dovecot = dovecotPkg; }) cfg.modules);
};
mailboxConfig = mailbox: ''
mailbox "${mailbox.name}" {
auto = ${toString mailbox.auto}
'' + optionalString (mailbox.autoexpunge != null) ''
autoexpunge = ${mailbox.autoexpunge}
'' + optionalString (mailbox.specialUse != null) ''
special_use = \${toString mailbox.specialUse}
'' + "}";
mailboxes = { name, ... }: {
options = {
name = mkOption {
type = types.strMatching ''[^"]+'';
example = "Spam";
default = name;
readOnly = true;
description = "The name of the mailbox.";
};
auto = mkOption {
type = types.enum [ "no" "create" "subscribe" ];
default = "no";
example = "subscribe";
description = "Whether to automatically create or create and subscribe to the mailbox or not.";
};
specialUse = mkOption {
type = types.nullOr (types.enum [ "All" "Archive" "Drafts" "Flagged" "Junk" "Sent" "Trash" ]);
default = null;
example = "Junk";
description = "Null if no special use flag is set. Other than that every use flag mentioned in the RFC is valid.";
};
autoexpunge = mkOption {
type = types.nullOr types.str;
default = null;
example = "60d";
description = ''
To automatically remove all email from the mailbox which is older than the
specified time.
'';
};
};
};
in
{
imports = [
(mkRemovedOptionModule [ "services" "dovecot2" "package" ] "")
];
options.services.dovecot2 = {
enable = mkEnableOption "Dovecot 2.x POP3/IMAP server";
enablePop3 = mkOption {
type = types.bool;
default = false;
description = "Start the POP3 listener (when Dovecot is enabled).";
};
enableImap = mkOption {
type = types.bool;
default = true;
description = "Start the IMAP listener (when Dovecot is enabled).";
};
enableLmtp = mkOption {
type = types.bool;
default = false;
description = "Start the LMTP listener (when Dovecot is enabled).";
};
protocols = mkOption {
type = types.listOf types.str;
default = [];
description = "Additional listeners to start when Dovecot is enabled.";
};
user = mkOption {
type = types.str;
default = "dovecot2";
description = "Dovecot user name.";
};
group = mkOption {
type = types.str;
default = "dovecot2";
description = "Dovecot group name.";
};
extraConfig = mkOption {
type = types.lines;
default = "";
example = "mail_debug = yes";
description = "Additional entries to put verbatim into Dovecot's config file.";
};
mailPlugins =
let
plugins = hint: types.submodule {
options = {
enable = mkOption {
type = types.listOf types.str;
default = [];
description = "mail plugins to enable as a list of strings to append to the ${hint} <literal>$mail_plugins</literal> configuration variable";
};
};
};
in
mkOption {
type = with types; submodule {
options = {
globally = mkOption {
description = "Additional entries to add to the mail_plugins variable for all protocols";
type = plugins "top-level";
example = { enable = [ "virtual" ]; };
default = { enable = []; };
};
perProtocol = mkOption {
description = "Additional entries to add to the mail_plugins variable, per protocol";
type = attrsOf (plugins "corresponding per-protocol");
default = {};
example = { imap = [ "imap_acl" ]; };
};
};
};
description = "Additional entries to add to the mail_plugins variable, globally and per protocol";
example = {
globally.enable = [ "acl" ];
perProtocol.imap.enable = [ "imap_acl" ];
};
default = { globally.enable = []; perProtocol = {}; };
};
configFile = mkOption {
type = types.nullOr types.path;
default = null;
description = "Config file used for the whole dovecot configuration.";
apply = v: if v != null then v else pkgs.writeText "dovecot.conf" dovecotConf;
};
mailLocation = mkOption {
type = types.str;
default = "maildir:/var/spool/mail/%u"; /* Same as inbox, as postfix */
example = "maildir:~/mail:INBOX=/var/spool/mail/%u";
description = ''
Location that dovecot will use for mail folders. Dovecot mail_location option.
'';
};
mailUser = mkOption {
type = types.nullOr types.str;
default = null;
description = "Default user to store mail for virtual users.";
};
mailGroup = mkOption {
type = types.nullOr types.str;
default = null;
description = "Default group to store mail for virtual users.";
};
createMailUser = mkOption {
type = types.bool;
default = true;
description = ''Whether to automatically create the user
given in <option>services.dovecot.user</option> and the group
given in <option>services.dovecot.group</option>.'';
};
modules = mkOption {
type = types.listOf types.package;
default = [];
example = literalExpression "[ pkgs.dovecot_pigeonhole ]";
description = ''
Symlinks the contents of lib/dovecot of every given package into
/etc/dovecot/modules. This will make the given modules available
if a dovecot package with the module_dir patch applied is being used.
'';
};
sslCACert = mkOption {
type = types.nullOr types.str;
default = null;
description = "Path to the server's CA certificate key.";
};
sslServerCert = mkOption {
type = types.nullOr types.str;
default = null;
description = "Path to the server's public key.";
};
sslServerKey = mkOption {
type = types.nullOr types.str;
default = null;
description = "Path to the server's private key.";
};
enablePAM = mkOption {
type = types.bool;
default = true;
description = "Whether to create a own Dovecot PAM service and configure PAM user logins.";
};
sieveScripts = mkOption {
type = types.attrsOf types.path;
default = {};
description = "Sieve scripts to be executed. Key is a sequence, e.g. 'before2', 'after' etc.";
};
showPAMFailure = mkOption {
type = types.bool;
default = false;
description = "Show the PAM failure message on authentication error (useful for OTPW).";
};
mailboxes = mkOption {
type = with types; coercedTo
(listOf unspecified)
(list: listToAttrs (map (entry: { name = entry.name; value = removeAttrs entry ["name"]; }) list))
(attrsOf (submodule mailboxes));
default = {};
example = literalExpression ''
{
Spam = { specialUse = "Junk"; auto = "create"; };
}
'';
description = "Configure mailboxes and auto create or subscribe them.";
};
enableQuota = mkOption {
type = types.bool;
default = false;
example = true;
description = "Whether to enable the dovecot quota service.";
};
quotaPort = mkOption {
type = types.str;
default = "12340";
description = ''
The Port the dovecot quota service binds to.
If using postfix, add check_policy_service inet:localhost:12340 to your smtpd_recipient_restrictions in your postfix config.
'';
};
quotaGlobalPerUser = mkOption {
type = types.str;
default = "100G";
example = "10G";
description = "Quota limit for the user in bytes. Supports suffixes b, k, M, G, T and %.";
};
};
config = mkIf cfg.enable {
security.pam.services.dovecot2 = mkIf cfg.enablePAM {};
security.dhparams = mkIf (cfg.sslServerCert != null) {
enable = true;
params.dovecot2 = {};
};
services.dovecot2.protocols =
optional cfg.enableImap "imap"
++ optional cfg.enablePop3 "pop3"
++ optional cfg.enableLmtp "lmtp";
services.dovecot2.mailPlugins = mkIf cfg.enableQuota {
globally.enable = [ "quota" ];
perProtocol.imap.enable = [ "imap_quota" ];
};
users.users = {
dovenull =
{
uid = config.ids.uids.dovenull2;
description = "Dovecot user for untrusted logins";
group = "dovenull";
};
} // optionalAttrs (cfg.user == "dovecot2") {
dovecot2 =
{
uid = config.ids.uids.dovecot2;
description = "Dovecot user";
group = cfg.group;
};
} // optionalAttrs (cfg.createMailUser && cfg.mailUser != null) {
${cfg.mailUser} =
{ description = "Virtual Mail User"; isSystemUser = true; } // optionalAttrs (cfg.mailGroup != null)
{ group = cfg.mailGroup; };
};
users.groups = {
dovenull.gid = config.ids.gids.dovenull2;
} // optionalAttrs (cfg.group == "dovecot2") {
dovecot2.gid = config.ids.gids.dovecot2;
} // optionalAttrs (cfg.createMailUser && cfg.mailGroup != null) {
${cfg.mailGroup} = {};
};
environment.etc."dovecot/modules".source = modulesDir;
environment.etc."dovecot/dovecot.conf".source = cfg.configFile;
systemd.services.dovecot2 = {
description = "Dovecot IMAP/POP3 server";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
restartTriggers = [ cfg.configFile modulesDir ];
startLimitIntervalSec = 60; # 1 min
serviceConfig = {
Type = "notify";
ExecStart = "${dovecotPkg}/sbin/dovecot -F";
ExecReload = "${dovecotPkg}/sbin/doveadm reload";
Restart = "on-failure";
RestartSec = "1s";
RuntimeDirectory = [ "dovecot2" ];
};
# When copying sieve scripts preserve the original time stamp
# (should be 0) so that the compiled sieve script is newer than
# the source file and Dovecot won't try to compile it.
preStart = ''
rm -rf ${stateDir}/sieve
'' + optionalString (cfg.sieveScripts != {}) ''
mkdir -p ${stateDir}/sieve
${concatStringsSep "\n" (
mapAttrsToList (
to: from: ''
if [ -d '${from}' ]; then
mkdir '${stateDir}/sieve/${to}'
cp -p "${from}/"*.sieve '${stateDir}/sieve/${to}'
else
cp -p '${from}' '${stateDir}/sieve/${to}'
fi
${pkgs.dovecot_pigeonhole}/bin/sievec '${stateDir}/sieve/${to}'
''
) cfg.sieveScripts
)}
chown -R '${cfg.mailUser}:${cfg.mailGroup}' '${stateDir}/sieve'
'';
};
environment.systemPackages = [ dovecotPkg ];
warnings = mkIf (any isList options.services.dovecot2.mailboxes.definitions) [
"Declaring `services.dovecot2.mailboxes' as a list is deprecated and will break eval in 21.05! See the release notes for more info for migration."
];
assertions = [
{
assertion = (cfg.sslServerCert == null) == (cfg.sslServerKey == null)
&& (cfg.sslCACert != null -> !(cfg.sslServerCert == null || cfg.sslServerKey == null));
message = "dovecot needs both sslServerCert and sslServerKey defined for working crypto";
}
{
assertion = cfg.showPAMFailure -> cfg.enablePAM;
message = "dovecot is configured with showPAMFailure while enablePAM is disabled";
}
{
assertion = cfg.sieveScripts != {} -> (cfg.mailUser != null && cfg.mailGroup != null);
message = "dovecot requires mailUser and mailGroup to be set when sieveScripts is set";
}
];
};
}