Add support for LDAP users
Allow configuring lookups for users and their mail addresses from an LDAP directory. The LDAP username will be used as an accountname as opposed to the email address used as the `loginName` for declarative accounts. Mailbox for LDAP users will be stored below `/var/vmail/ldap/<account>`. Configuring domains is out of scope, since domains require further configuration within the NixOS mailserver construct to set up all related services accordingly. Aliases can already be configured using `mailserver.forwards` but could be supported using LDAP at a later point.
This commit is contained in:
Martin Weinelt
lewo
parent
d460e9ff62
commit
08f077c5ca
150
default.nix
150
default.nix
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@ -198,6 +198,156 @@ in
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default = {};
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};
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ldap = {
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enable = mkEnableOption "LDAP support";
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uris = mkOption {
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type = types.listOf types.str;
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example = literalExpression ''
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[
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"ldaps://ldap1.example.com"
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"ldaps://ldap2.example.com"
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]
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'';
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description = ''
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URIs where your LDAP server can be reached
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'';
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};
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startTls = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable StartTLS upon connection to the server.
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'';
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};
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tlsCAFile = mkOption {
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type = types.path;
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default = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
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description = ''
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Certifificate trust anchors used to verify the LDAP server certificate.
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'';
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};
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bind = {
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dn = mkOption {
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type = types.str;
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example = "cn=mail,ou=accounts,dc=example,dc=com";
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description = ''
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Distinguished name used by the mail server to do lookups
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against the LDAP servers.
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'';
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};
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password = mkOption {
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type = types.str;
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example = "not$4f3";
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description = ''
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Password required to authenticate against the LDAP servers.
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'';
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};
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};
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searchBase = mkOption {
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type = types.str;
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example = "ou=people,ou=accounts,dc=example,dc=com";
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description = ''
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Base DN at below which to search for users accounts.
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'';
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};
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searchScope = mkOption {
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type = types.enum [ "sub" "base" "one" ];
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default = "sub";
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description = ''
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Search scope below which users accounts are looked for.
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'';
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};
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dovecot = {
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userAttrs = mkOption {
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type = types.str;
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default = "";
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description = ''
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LDAP attributes to be retrieved during userdb lookups.
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See the users_attrs reference at
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https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#user-attrs
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in the Dovecot manual.
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'';
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};
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userFilter = mkOption {
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type = types.str;
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default = "cn=%u";
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example = "(&(objectClass=inetOrgPerson)(cn=%u))";
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description = ''
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Filter for user lookups in Dovecot.
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See the user_filter reference at
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https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#user-filter
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in the Dovecot manual.
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'';
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};
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passAttrs = mkOption {
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type = types.str;
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default = "userPassword=password";
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description = ''
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LDAP attributes to be retrieved during passdb lookups.
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See the pass_attrs reference at
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https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#pass-attrs
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in the Dovecot manual.
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'';
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};
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passFilter = mkOption {
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type = types.str;
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default = "cn=%u";
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example = "(&(objectClass=inetOrgPerson)(cn=%u))";
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description = ''
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Filter for password lookups in Dovecot.
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See the pass_filter reference for
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https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#pass-filter
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in the Dovecot manual.
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'';
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};
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};
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postfix = {
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filter = mkOption {
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type = types.str;
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default = "mail=%s";
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example = "(&(objectClass=inetOrgPerson)(mail=%s))";
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description = ''
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LDAP filter used to search for an account by mail, where
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<literal>%s</literal> is a substitute for the address in
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question.
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'';
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};
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uidAttribute = mkOption {
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type = types.str;
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default = "cn";
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example = "uid";
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description = ''
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The LDAP attribute referencing the account name for a user.
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'';
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};
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mailAttribute = mkOption {
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type = types.str;
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default = "mail";
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description = ''
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The LDAP attribute holding mail addresses for a user.
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'';
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};
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};
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};
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indexDir = mkOption {
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type = types.nullOr types.str;
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default = null;
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@ -99,6 +99,12 @@ let
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# The assertion garantees there is exactly one Junk mailbox.
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junkMailboxName = if junkMailboxNumber == 1 then builtins.elemAt junkMailboxes 0 else "";
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mkLdapSearchScope = scope: (
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if scope == "sub" then "subtree"
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else if scope == "one" then "onelevel"
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else scope
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);
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in
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{
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config = with cfg; lib.mkIf enable {
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@ -236,6 +242,19 @@ in
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default_fields = uid=${builtins.toString cfg.vmailUID} gid=${builtins.toString cfg.vmailUID} home=${cfg.mailDirectory}
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}
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${lib.optionalString cfg.ldap.enable ''
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passdb {
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driver = ldap
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args = /etc/dovecot/dovecot-ldap.conf.ext
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}
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userdb {
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driver = ldap
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args = /etc/dovecot/dovecot-ldap.conf.ext
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default_fields = home=/var/vmail/ldap/%u uid=${toString cfg.vmailUID} gid=${toString cfg.vmailUID}
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}
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''}
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service auth {
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unix_listener auth {
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mode = 0660
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@ -298,6 +317,37 @@ in
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'';
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};
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environment.etc = lib.optionalAttrs (cfg.ldap.enable) {
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"dovecot/dovecot-ldap.conf.ext" = {
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mode = "0600";
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uid = config.ids.uids.dovecot2;
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gid = config.ids.gids.dovecot2;
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text = ''
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ldap_version = 3
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uris = ${lib.concatStringsSep " " cfg.ldap.uris}
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${lib.optionalString cfg.ldap.startTls ''
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tls = yes
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''}
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tls_require_cert = hard
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tls_ca_cert_file = ${cfg.ldap.tlsCAFile}
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dn = ${cfg.ldap.bind.dn}
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dnpass = ${cfg.ldap.bind.password}
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sasl_bind = no
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auth_bind = yes
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base = ${cfg.ldap.searchBase}
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scope = ${mkLdapSearchScope cfg.ldap.searchScope}
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${lib.optionalString (cfg.ldap.dovecot.userAttrs != "") ''
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user_attrs = ${cfg.ldap.dovecot.user_attrs}
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''}
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user_filter = ${cfg.ldap.dovecot.userFilter}
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${lib.optionalString (cfg.ldap.dovecot.passAttrs != "") ''
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pass_attrs = ${cfg.ldap.dovecot.passAttrs}
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''}
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pass_filter = ${cfg.ldap.dovecot.passFilter}
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'';
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};
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};
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systemd.services.dovecot2 = {
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preStart = ''
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${genPasswdScript}
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@ -133,11 +133,40 @@ let
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smtpd_sasl_security_options = "noanonymous";
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smtpd_sasl_local_domain = "$myhostname";
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smtpd_client_restrictions = "permit_sasl_authenticated,reject";
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smtpd_sender_login_maps = "hash:/etc/postfix/vaccounts";
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smtpd_sender_login_maps = "hash:/etc/postfix/vaccounts${lib.optionalString cfg.ldap.enable ",ldap:${ldapSenderLoginMap}"}";
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smtpd_sender_restrictions = "reject_sender_login_mismatch";
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smtpd_recipient_restrictions = "reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject";
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cleanup_service_name = "submission-header-cleanup";
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};
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commonLdapConfig = lib.optionalString (cfg.ldap.enable) ''
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server_host = ${lib.concatStringsSep " " cfg.ldap.uris}
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start_tls = ${if cfg.ldap.startTls then "yes" else "no"}
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version = 3
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tls_ca_cert_file = ${cfg.ldap.tlsCAFile}
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tls_require_cert = yes
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search_base = ${cfg.ldap.searchBase}
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scope = ${cfg.ldap.searchScope}
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bind = yes
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bind_dn = ${cfg.ldap.bind.dn}
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bind_pw = ${cfg.ldap.bind.password}
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'';
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ldapSenderLoginMap = lib.optionalString (cfg.ldap.enable)
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(pkgs.writeText "ldap-sender-login-map.cf" ''
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${commonLdapConfig}
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query_filter = ${cfg.ldap.postfix.filter}
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result_attribute = ${cfg.ldap.postfix.uidAttribute}
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'');
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ldapVirtualMailboxMap = lib.optionalString (cfg.ldap.enable)
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(pkgs.writeText "ldap-virtual-mailbox-map.cf" ''
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${commonLdapConfig}
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query_filter = ${cfg.ldap.postfix.filter}
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result_attribute = ${cfg.ldap.postfix.uidAttribute}
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'');
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in
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{
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config = with cfg; lib.mkIf enable {
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@ -170,7 +199,11 @@ in
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virtual_gid_maps = "static:5000";
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virtual_mailbox_base = mailDirectory;
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virtual_mailbox_domains = vhosts_file;
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virtual_mailbox_maps = mappedFile "valias";
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virtual_mailbox_maps = [
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(mappedFile "valias")
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] ++ lib.optionals (cfg.ldap.enable) [
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"ldap:${ldapVirtualMailboxMap}"
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];
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virtual_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp";
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# Avoid leakage of X-Original-To, X-Delivered-To headers between recipients
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lmtp_destination_recipient_limit = "1";
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