1 files changed, 143 insertions, 0 deletions
diff --git a/krebs/3modules/exim-retiolum.nix b/krebs/3modules/exim-retiolum.nix
new file mode 100644
index 000000000..71c091917
--- /dev/null
+++ b/krebs/3modules/exim-retiolum.nix
@@ -0,0 +1,143 @@
+{ config, pkgs, lib, ... }:
+
+with builtins;
+with lib;
+let
+  cfg = config.krebs.exim-retiolum;
+
+  out = {
+    options.krebs.exim-retiolum = api;
+    config =
+      # This configuration makes only sense for retiolum-enabled hosts.
+      # TODO modular configuration
+      mkIf cfg.enable (
+        #assert config.krebs.retiolum.enable;
+        imp);
+  };
+
+  api = {
+    enable = mkEnableOption "krebs.exim-retiolum";
+  };
+
+  imp = {
+    services.exim = {
+      enable = true;
+      config = ''
+        primary_hostname = ${retiolumHostname}
+        domainlist local_domains    = @ : localhost
+        domainlist relay_to_domains = *.retiolum
+        hostlist   relay_from_hosts = <; 127.0.0.1 ; ::1
+
+        acl_smtp_rcpt = acl_check_rcpt
+        acl_smtp_data = acl_check_data
+
+        host_lookup = *
+        rfc1413_hosts = *
+        rfc1413_query_timeout = 5s
+
+        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 = *.retiolum
+          #  domains = *.retiolum
+          #  control = dkim_disable_verify
+
+          #require verify        = sender
+
+          accept  hosts         = +relay_from_hosts
+                  control       = submission
+                  control       = dkim_disable_verify
+
+          accept  authenticated = *
+                  control       = submission
+                  control       = dkim_disable_verify
+
+          require message = relay not permitted
+                  domains = +local_domains : +relay_to_domains
+
+          require verify = recipient
+
+          accept
+
+
+        acl_check_data:
+          accept
+
+
+        begin routers
+
+        retiolum:
+          driver = manualroute
+          domains = ! ${retiolumHostname} : *.retiolum
+          transport = remote_smtp
+          route_list = ^.* $0 byname
+          no_more
+
+        nonlocal:
+          debug_print = "R: nonlocal for $local_part@$domain"
+          driver = redirect
+          domains = ! +local_domains
+          allow_fail
+          data = :fail: Mailing to remote domains not supported
+          no_more
+
+        local_user:
+          # debug_print = "R: local_user for $local_part@$domain"
+          driver = accept
+          check_local_user
+        # local_part_suffix = +* : -*
+        # local_part_suffix_optional
+          transport = home_maildir
+          cannot_route_message = Unknown user
+
+
+        begin transports
+
+        remote_smtp:
+          driver = smtp
+
+        home_maildir:
+          driver = appendfile
+          maildir_format
+          directory = $home/Maildir
+          directory_mode = 0700
+          delivery_date_add
+          envelope_to_add
+          return_path_add
+        # group = mail
+        # mode = 0660
+
+        begin retry
+        *.retiolum             *           F,42d,1m
+        *                      *           F,2h,15m; G,16h,1h,1.5; F,4d,6h
+
+        begin rewrite
+
+        begin authenticators
+      '';
+    };
+  };
+
+  # TODO get the hostname from somewhere else.
+  retiolumHostname = "${config.networking.hostName}.retiolum";
+in
+out