diff options
Diffstat (limited to 'krebs/3modules/exim-smarthost.nix')
| -rw-r--r-- | krebs/3modules/exim-smarthost.nix | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/krebs/3modules/exim-smarthost.nix b/krebs/3modules/exim-smarthost.nix new file mode 100644 index 000000000..a564430ea --- /dev/null +++ b/krebs/3modules/exim-smarthost.nix @@ -0,0 +1,219 @@ +{ config, pkgs, lib, ... }: + +with builtins; +with lib; +let + cfg = config.krebs.exim-smarthost; + + out = { + options.krebs.exim-smarthost = api; + config = mkIf cfg.enable imp; + }; + + api = { + enable = mkEnableOption "krebs.exim-smarthost"; + + internet-aliases = mkOption { + type = types.listOf (types.submodule ({ + options = { + from = mkOption { + type = types.str; # TODO e-mail address + }; + to = mkOption { + type = types.str; # TODO e-mail address / TODO listOf + }; + }; + })); + }; + + relay_from_hosts = mkOption { + type = with types; listOf str; + default = []; + }; + + primary_hostname = mkOption { + type = types.str; + default = "${config.networking.hostName}.retiolum"; + }; + + sender_domains = mkOption { + type = with types; listOf str; + default = []; + }; + + system-aliases = mkOption { + type = types.listOf (types.submodule ({ + options = { + from = mkOption { + type = types.str; # TODO e-mail address + }; + to = mkOption { + type = types.str; # TODO e-mail address / TODO listOf + }; + }; + })); + }; + }; + + imp = { + services.exim = { + enable = true; + config = '' + primary_hostname = ${cfg.primary_hostname} + + # HOST_REDIR contains the real destinations for "local_domains". + #HOST_REDIR = /etc/exim4/host_redirect + + + # Domains not listed in local_domains need to be deliverable remotely. + # XXX We abuse local_domains to mean "domains, we're the gateway for". + domainlist local_domains = @ : localhost + domainlist relay_to_domains = + hostlist relay_from_hosts = <;${concatStringsSep ";" ( + [ + "127.0.0.1" + "::1" + ] + ++ + cfg.relay_from_hosts + )} + + acl_smtp_rcpt = acl_check_rcpt + acl_smtp_data = acl_check_data + + never_users = root + + host_lookup = * + + rfc1413_hosts = * + rfc1413_query_timeout = 5s + + log_selector = -queue_run +address_rewrite +all_parents +queue_time + log_file_path = syslog + syslog_timestamp = false + syslog_duplication = false + + begin acl + + acl_check_rcpt: + accept hosts = : + control = dkim_disable_verify + + deny message = Restricted characters in address + domains = +local_domains + local_parts = ^[.] : ^.*[@%!/|] + + deny message = Restricted characters in address + domains = !+local_domains + local_parts = ^[./|] : ^.*[@%!] : ^.*/\\.\\./ + + accept local_parts = postmaster + domains = +local_domains + + accept hosts = +relay_from_hosts + control = submission + control = dkim_disable_verify + + accept authenticated = * + control = submission + control = dkim_disable_verify + + accept message = relay not permitted 2 + recipients = lsearch;${lsearch.internet-aliases} + + require message = relay not permitted + domains = +local_domains : +relay_to_domains + + require + message = unknown user + verify = recipient/callout + + accept + + + acl_check_data: + warn + sender_domains = ${concatStringsSep ":" cfg.sender_domains} + set acl_m_special_dom = $sender_address_domain + + accept + + + begin routers + + # feature RETIOLUM_MAIL + retiolum: + debug_print = "R: retiolum for $local_part@$domain" + driver = manualroute + domains = ! ${cfg.primary_hostname} : *.retiolum + transport = retiolum_smtp + route_list = ^.* $0 byname + no_more + + internet_aliases: + debug_print = "R: internet_aliases for $local_part@$domain" + driver = redirect + data = ''${lookup{$local_part@$domain}lsearch{${lsearch.internet-aliases}}} + + dnslookup: + debug_print = "R: dnslookup for $local_part@$domain" + driver = dnslookup + domains = ! +local_domains + transport = remote_smtp + ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 + no_more + + system_aliases: + debug_print = "R: system_aliases for $local_part@$domain" + driver = redirect + data = ''${lookup{$local_part}lsearch{${lsearch.system-aliases}}} + + local_user: + debug_print = "R: local_user for $local_part@$domain" + driver = accept + check_local_user + transport = home_maildir + cannot_route_message = Unknown user + + begin transports + + retiolum_smtp: + driver = smtp + retry_include_ip_address = false + + remote_smtp: + driver = smtp + helo_data = ''${if eq{$acl_m_special_dom}{} \ + {$primary_hostname} \ + {$acl_m_special_dom} } + + home_maildir: + driver = appendfile + maildir_format + maildir_use_size_file + directory = $home/Mail + directory_mode = 0700 + delivery_date_add + envelope_to_add + return_path_add + + begin retry + *.retiolum * F,42d,1m + * * F,2h,15m; G,16h,1h,1.5; F,4d,6h + + begin rewrite + begin authenticators + ''; + }; + }; + + + lsearch = mapAttrs (name: set: toFile name (to-lsearch set)) { + inherit (cfg) internet-aliases; + inherit (cfg) system-aliases; + }; + + to-lsearch = concatMapStringsSep "\n" ({ from, to, ... }: "${from}: ${to}"); + +in +out |