nixpkgs/modules/services/mail/dovecot.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.dovecot2;
dovecotConf =
''
base_dir = /var/run/dovecot2/
protocols = ${optionalString cfg.enableImap "imap"} ${optionalString cfg.enablePop3 "pop3"}
''
+ (if cfg.sslServerCert!="" then
''
ssl_cert = <${cfg.sslServerCert}
ssl_key = <${cfg.sslServerKey}
ssl_ca = <${cfg.sslCACert}
disable_plaintext_auth = yes
'' else ''
ssl = no
disable_plaintext_auth = no
'')
+ ''
default_internal_user = ${cfg.user}
mail_location = ${cfg.mailLocation}
maildir_copy_with_hardlinks = yes
auth_mechanisms = plain login
service auth {
user = root
}
userdb {
driver = passwd
}
passdb {
driver = pam
args = dovecot2
}
pop3_uidl_format = %08Xv%08Xu
'' + cfg.extraConfig;
confFile = pkgs.writeText "dovecot.conf" dovecotConf;
in
{
###### interface
options = {
services.dovecot2 = {
enable = mkOption {
default = false;
description = "Whether to enable the Dovecot 2.x POP3/IMAP server.";
};
enablePop3 = mkOption {
default = true;
description = "Start the POP3 listener (when Dovecot is enabled).";
};
enableImap = mkOption {
default = true;
description = "Start the IMAP listener (when Dovecot is enabled).";
};
user = mkOption {
default = "dovecot2";
description = "Dovecot user name.";
};
group = mkOption {
default = "dovecot2";
description = "Dovecot group name.";
};
extraConfig = mkOption {
default = "";
example = "mail_debug = yes";
description = "Additional entries to put verbatim into Dovecot's config file.";
};
mailLocation = mkOption {
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.
'';
};
sslServerCert = mkOption {
default = "";
description = "Server certificate";
};
sslCACert = mkOption {
default = "";
description = "CA certificate used by the server certificate.";
};
sslServerKey = mkOption {
default = "";
description = "Server key.";
};
};
};
###### implementation
config = mkIf config.services.dovecot2.enable {
security.pam.services = [ { name = "dovecot2"; } ];
users.extraUsers = [
{ name = cfg.user;
uid = config.ids.uids.dovecot2;
description = "Dovecot user";
group = cfg.group;
}
{ name = "dovenull";
uid = config.ids.uids.dovenull2;
description = "Dovecot user for untrusted logins";
group = cfg.group;
}
];
users.extraGroups = singleton
{ name = cfg.group;
gid = config.ids.gids.dovecot2;
};
jobs.dovecot2 =
{ description = "Dovecot IMAP/POP3 server";
startOn = "started networking";
preStart =
''
${pkgs.coreutils}/bin/mkdir -p /var/run/dovecot2 /var/run/dovecot2/login
${pkgs.coreutils}/bin/chown -R ${cfg.user}:${cfg.group} /var/run/dovecot2
'';
exec = "${pkgs.dovecot}/sbin/dovecot -F -c ${confFile}";
};
environment.systemPackages = [ pkgs.dovecot ];
assertions = [{ assertion = cfg.enablePop3 || cfg.enableImap;
message = "dovecot needs at least one of the IMAP or POP3 listeners enabled";}];
};
}