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