3ba2095a42
This option got introduced in 7904499542
and it didn't check whether mailUser and mailGroup are null, which they
are by default.
Now we're only creating the user if createMailUser is set in conjunction
with mailUser and the group if mailGroup is set as well.
I've added a NixOS VM test so that we can verify whether dovecot works
without any additional options set, so it serves as a regression test
for issue #29466 and other issues that might come up with future changes
to the Dovecot service.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Fixes: #29466
Cc: @qknight, @abbradar, @ixmatus, @siddharthist
395 lines
12 KiB
Nix
395 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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canCreateMailUserGroup = cfg.mailUser != null && cfg.mailGroup != null;
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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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disable_plaintext_auth = yes
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'')
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''
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default_internal_user = ${cfg.user}
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${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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''
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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 = { lib, pkgs, ... }: {
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options = {
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name = mkOption {
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type = types.str;
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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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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.extraUsers = [
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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.extraGroups = 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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