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-rw-r--r--hosts/surtr/email/default.nix101
1 files changed, 28 insertions, 73 deletions
diff --git a/hosts/surtr/email/default.nix b/hosts/surtr/email/default.nix
index 49f156eb..da1c005d 100644
--- a/hosts/surtr/email/default.nix
+++ b/hosts/surtr/email/default.nix
@@ -2,34 +2,7 @@
2 2
3with lib; 3with lib;
4 4
5let 5{
6 postfix_map = tableType: tableName: "${tableType}:/run/postfix/maps/${tableName}";
7 postfix_hash = postfix_map "hash";
8in {
9 options = {
10 services.postfix.mapFilesRun = mkOption {
11 type = types.attrsOf (types.either types.path (types.submodule {
12 options = {
13 type = mkOption {
14 type = types.str;
15 default = "hash";
16 };
17
18 path = mkOption {
19 type = types.nullOr types.path;
20 default = null;
21 };
22
23 text = mkOption {
24 type = types.nullOr types.lines;
25 default = null;
26 };
27 };
28 }));
29 default = {};
30 };
31 };
32
33 config = { 6 config = {
34 services.postfix = { 7 services.postfix = {
35 enable = true; 8 enable = true;
@@ -41,25 +14,9 @@ in {
41 sslCert = "/run/credentials/postfix.service/surtr.yggdrasil.li.pem"; 14 sslCert = "/run/credentials/postfix.service/surtr.yggdrasil.li.pem";
42 sslKey = "/run/credentials/postfix.service/surtr.yggdrasil.li.key.pem"; 15 sslKey = "/run/credentials/postfix.service/surtr.yggdrasil.li.key.pem";
43 networks = ["127.0.0.0/8" "[::ffff:127.0.0.0]/104" "[::1]/128" "10.141.0.0/16"]; 16 networks = ["127.0.0.0/8" "[::ffff:127.0.0.0]/104" "[::1]/128" "10.141.0.0/16"];
44 mapFilesRun = { 17 config = let
45 "relay_ccert" = { text = ""; }; 18 relay_ccert = "texthash:${pkgs.writeText "relay_ccert" ""}";
46 "sni" = { text = '' 19 in {
47 bouncy.email /run/credentials/postfix.service/bouncy.email.sni.pem
48 mailin.bouncy.email /run/credentials/postfix.service/mailin.bouncy.email.sni.pem
49 mailsub.bouncy.email /run/credentials/postfix.service/mailsub.bouncy.email.sni.pem
50 .bouncy.email /run/credentials/postfix.service/bouncy.email.sni.pem
51 '';};
52 "esmtp_access" = { type = "cidr"; text = ''
53 # Allow DSN requests from local subnet only
54 192.168.0.0/16 silent-discard
55 172.16.0.0/12 silent-discard
56 10.0.0.0/8 silent-discard
57 0.0.0.0/0 silent-discard, dsn
58 fd00::/8 silent-discard
59 ::/0 silent-discard, dsn
60 '';};
61 };
62 config = {
63 #the dh params 20 #the dh params
64 smtpd_tls_dh1024_param_file = toString config.security.dhparams.params."postfix-1024".path; 21 smtpd_tls_dh1024_param_file = toString config.security.dhparams.params."postfix-1024".path;
65 smtpd_tls_dh512_param_file = toString config.security.dhparams.params."postfix-512".path; 22 smtpd_tls_dh512_param_file = toString config.security.dhparams.params."postfix-512".path;
@@ -89,7 +46,12 @@ in {
89 smtp_tls_security_level = "dane"; 46 smtp_tls_security_level = "dane";
90 smtp_dns_support_level = "dnssec"; 47 smtp_dns_support_level = "dnssec";
91 48
92 tls_server_sni_maps = postfix_hash "sni"; 49 tls_server_sni_maps = ''cidr:${pkgs.writeText "sni" ''
50 bouncy.email /run/credentials/postfix.service/bouncy.email.sni.pem
51 mailin.bouncy.email /run/credentials/postfix.service/mailin.bouncy.email.sni.pem
52 mailsub.bouncy.email /run/credentials/postfix.service/mailsub.bouncy.email.sni.pem
53 .bouncy.email /run/credentials/postfix.service/bouncy.email.sni.pem
54 ''}'';
93 55
94 local_recipient_maps = ""; 56 local_recipient_maps = "";
95 57
@@ -107,7 +69,7 @@ in {
107 "reject_non_fqdn_recipient" 69 "reject_non_fqdn_recipient"
108 "reject_unknown_recipient_domain" 70 "reject_unknown_recipient_domain"
109 "permit_mynetworks" 71 "permit_mynetworks"
110 "check_ccert_access ${postfix_hash "relay_ccert"}" 72 "check_ccert_access ${relay_ccert}"
111 "reject_non_fqdn_helo_hostname" 73 "reject_non_fqdn_helo_hostname"
112 "reject_invalid_helo_hostname" 74 "reject_invalid_helo_hostname"
113 "reject_unauth_destination" 75 "reject_unauth_destination"
@@ -117,7 +79,7 @@ in {
117 79
118 smtpd_relay_restrictions = [ 80 smtpd_relay_restrictions = [
119 "permit_mynetworks" 81 "permit_mynetworks"
120 "check_ccert_access ${postfix_hash "relay_ccert"}" 82 "check_ccert_access ${relay_ccert}"
121 "reject_unauth_destination" 83 "reject_unauth_destination"
122 ]; 84 ];
123 85
@@ -137,7 +99,15 @@ in {
137 maximal_queue_lifetime = "100m"; 99 maximal_queue_lifetime = "100m";
138 bounce_queue_lifetime = "20m"; 100 bounce_queue_lifetime = "20m";
139 101
140 smtpd_discard_ehlo_keyword_address_maps = postfix_map "cidr" "esmtp_access"; 102 smtpd_discard_ehlo_keyword_address_maps = "cidr:${pkgs.writeText "esmtp_access" ''
103 # Allow DSN requests from local subnet only
104 192.168.0.0/16 silent-discard
105 172.16.0.0/12 silent-discard
106 10.0.0.0/8 silent-discard
107 0.0.0.0/0 silent-discard, dsn
108 fd00::/8 silent-discard
109 ::/0 silent-discard, dsn
110 ''}";
141 111
142 sender_canonical_maps = "tcp:localhost:${toString config.services.postsrsd.forwardPort}"; 112 sender_canonical_maps = "tcp:localhost:${toString config.services.postsrsd.forwardPort}";
143 sender_canonical_classes = "envelope_sender"; 113 sender_canonical_classes = "envelope_sender";
@@ -204,27 +174,12 @@ in {
204 "surtr.yggdrasil.li" = {}; 174 "surtr.yggdrasil.li" = {};
205 }; 175 };
206 176
207 systemd.services.postfix = { 177 systemd.services.postfix.serviceConfig.LoadCredential = [
208 preStart = concatStringsSep "\n" (mapAttrsToList (to: from: let 178 "surtr.yggdrasil.li.key.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/key.pem"
209 cont = {type, path, text}: assert !(isNull path && isNull text); let 179 "surtr.yggdrasil.li.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/fullchain.pem"
210 path' = if isNull path then pkgs.writeText to text else path; 180 "bouncy.email.sni.pem:${config.security.acme.certs."bouncy.email".directory}/sni.pem"
211 in '' 181 "mailin.bouncy.email.sni.pem:${config.security.acme.certs."mailin.bouncy.email".directory}/sni.pem"
212 ln -sf ${path'} /run/postfix/maps/${to} 182 "mailsub.bouncy.email.sni.pem:${config.security.acme.certs."mailsub.bouncy.email".directory}/sni.pem"
213 postmap ${type}:/run/postfix/maps/${to} 183 ];
214 '';
215 in if builtins.isPath from then cont { path = from; } else cont from
216 ) config.services.postfix.mapFilesRun);
217
218 serviceConfig = {
219 RuntimeDirectory = ["postfix/maps"];
220 LoadCredential = [
221 "surtr.yggdrasil.li.key.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/key.pem"
222 "surtr.yggdrasil.li.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/fullchain.pem"
223 "bouncy.email.sni.pem:${config.security.acme.certs."bouncy.email".directory}/sni.pem"
224 "mailin.bouncy.email.sni.pem:${config.security.acme.certs."mailin.bouncy.email".directory}/sni.pem"
225 "mailsub.bouncy.email.sni.pem:${config.security.acme.certs."mailsub.bouncy.email".directory}/sni.pem"
226 ];
227 };
228 };
229 }; 184 };
230} 185}