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-rw-r--r--krebs/3modules/exim-smarthost.nix219
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