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1{
2 self,
3 config,
4 lib,
5 pkgs,
6 ...
7}:
8let
9 relayHosts = map (host: host.nets.retiolum.ip6.addr) [
10 config.krebs.hosts.aergia
11 config.krebs.hosts.ignavia
12 config.krebs.hosts.coaxmetal
13 config.krebs.hosts.green
14 config.krebs.hosts.mors
15 ];
16
17 mynetworks = map (ip: "[${ip}]") relayHosts;
18in
19{
20 imports = [
21 self.inputs.nixos-mailserver.nixosModules.default
22 ];
23
24 mailserver = {
25 enable = true;
26 fqdn = "mail.lassul.us";
27 domains = [ "lassul.us" ];
28
29 loginAccounts = {
30 "lass@lassul.us" = {
31 hashedPasswordFile =
32 config.clan.core.vars.generators.mailserver-lass.files."lass-mail-password-hash".path;
33 aliases = [
34 "postmaster@lassul.us"
35 "root@lassul.us"
36 "abuse@lassul.us"
37 "hostmaster@lassul.us"
38 "webmaster@lassul.us"
39 "security@lassul.us"
40 "noc@lassul.us"
41 "mailer-daemon@lassul.us"
42 "nobody@lassul.us"
43 "lassulus@lassul.us"
44 ];
45 catchAll = [ "lassul.us" ];
46 };
47 "bot@lassul.us" = {
48 hashedPasswordFile =
49 config.clan.core.vars.generators.mailserver-bot.files."bot-mail-password-hash".path;
50 };
51 };
52
53 # TLS via existing ACME cert
54 x509.useACMEHost = "mail.lassul.us";
55
56 # DKIM — auto-managed by module
57 dkimSigning = true;
58 dkimSelector = "mail";
59
60 # ManageSieve: lets mail clients manage sieve rules dynamically (port 4190)
61 enableManageSieve = true;
62
63 # Full-text search for IMAP clients
64 fullTextSearch = {
65 enable = true;
66 memoryLimit = 500;
67 };
68
69 stateVersion = 3;
70 };
71
72 # dovecot pre-start creates /var/vmail with 0700; widen for lass (virtualMail group)
73 # POSIX ACL default ensures new files inherit lass access (needed for muchsync hardlinks)
74 systemd.services.dovecot.serviceConfig.ExecStartPost = [
75 "+${pkgs.coreutils}/bin/chmod 2770 /var/vmail"
76 "+${pkgs.acl}/bin/setfacl -R -m u:lass:rwX /var/vmail/lassul.us/lass/mail"
77 "+${pkgs.acl}/bin/setfacl -R -d -m u:lass:rwX /var/vmail/lassul.us/lass/mail"
78 ];
79
80 # Password generation for mail accounts
81 clan.core.vars.generators.mailserver-lass = {
82 files."lass-mail-password" = { };
83 files."lass-mail-password-hash" = { };
84 runtimeInputs = with pkgs; [
85 coreutils
86 mkpasswd
87 pwgen
88 ];
89 script = ''
90 pwgen -s 32 1 > "$out/lass-mail-password"
91 mkpasswd -sm bcrypt < "$out/lass-mail-password" > "$out/lass-mail-password-hash"
92 '';
93 };
94
95 clan.core.vars.generators.mailserver-bot = {
96 files."bot-mail-password" = { };
97 files."bot-mail-password-hash" = { };
98 files."mail.env" = { };
99 runtimeInputs = with pkgs; [
100 coreutils
101 mkpasswd
102 pwgen
103 ];
104 script = ''
105 pwgen -s 32 1 > "$out/bot-mail-password"
106 mkpasswd -sm bcrypt < "$out/bot-mail-password" > "$out/bot-mail-password-hash"
107 cat > "$out/mail.env" << EOF
108 IMAP_USER=bot@lassul.us
109 IMAP_PASSWORD=$(cat "$out/bot-mail-password")
110 IMAP_HOST=localhost
111 EOF
112 '';
113 };
114
115 # Retiolum relay: allow krebs hosts to relay through postfix
116 services.postfix.settings.main.mynetworks = lib.mkForce (
117 [
118 "127.0.0.0/8"
119 "[::1]/128"
120 ]
121 ++ mynetworks
122 );
123
124 # ACME cert — reuse existing setup
125 security.acme.certs."mail.lassul.us" = {
126 group = "lasscert";
127 webroot = "/var/lib/acme/acme-challenge";
128 };
129 users.groups.lasscert.members = [
130 "dovecot2"
131 "postfix"
132 "nginx"
133 ];
134
135 # Firewall: SMTP(25), submission(587), submissions(465), IMAPS(993), ManageSieve(4190)
136 networking.firewall.allowedTCPPorts = [
137 25
138 587
139 465
140 993
141 4190
142 ];
143
144 # muchsync: lass user needs access to vmail for notmuch/muchsync
145 users.groups.virtualMail.members = [ "lass" ];
146 systemd.tmpfiles.rules = [
147 "L+ /home/lass/Maildir - - - - /var/vmail/lassul.us/lass/mail"
148 "z /var/vmail/lassul.us 2770 virtualMail virtualMail -"
149 "z /var/vmail/lassul.us/lass 2770 virtualMail virtualMail -"
150 "d /var/vmail/lassul.us/lass/mail 2770 virtualMail virtualMail -"
151 ];
152
153 # Thunderbird autoconfig
154 services.nginx.virtualHosts."autoconfig.lassul.us" = {
155 forceSSL = true;
156 enableACME = true;
157 locations."= /mail/config-v1.1.xml".extraConfig = ''
158 default_type application/xml;
159 return 200 '<?xml version="1.0" encoding="UTF-8"?>
160 <clientConfig version="1.1">
161 <emailProvider id="lassul.us">
162 <domain>lassul.us</domain>
163 <displayName>lassul.us Mail</displayName>
164 <displayShortName>lassul.us</displayShortName>
165 <incomingServer type="imap">
166 <hostname>mail.lassul.us</hostname>
167 <port>993</port>
168 <socketType>SSL</socketType>
169 <authentication>password-cleartext</authentication>
170 <username>%EMAILADDRESS%</username>
171 </incomingServer>
172 <outgoingServer type="smtp">
173 <hostname>mail.lassul.us</hostname>
174 <port>465</port>
175 <socketType>SSL</socketType>
176 <authentication>password-cleartext</authentication>
177 <username>%EMAILADDRESS%</username>
178 </outgoingServer>
179 </emailProvider>
180 </clientConfig>';
181 '';
182 };
183
184 # Dovecot virtual mailbox + ACL-restricted shared namespace for bot
185 services.dovecot2.mailPlugins.globally.enable = [
186 "virtual"
187 "acl"
188 ];
189 services.dovecot2.extraConfig =
190 let
191 virtualDir = pkgs.linkFarm "dovecot-virtual" [
192 {
193 name = "Unread/dovecot-virtual";
194 path = pkgs.writeText "dovecot-virtual-unread" "*\n unseen\n";
195 }
196 ];
197 in
198 ''
199 plugin {
200 acl = vfile
201 acl_shared_dict = file:/var/vmail/shared-mailboxes.db
202 }
203
204 namespace shared {
205 type = shared
206 separator = .
207 prefix = shared.%%n.
208 location = maildir:/var/vmail/lassul.us/%%n/mail:LAYOUT=Maildir++
209 subscriptions = no
210 list = children
211 }
212
213 namespace virtual {
214 prefix = virtual.
215 separator = .
216 location = virtual:${virtualDir}:INDEX=/var/vmail/virtual-indexes/%u
217 subscriptions = no
218 mailbox Unread {
219 auto = subscribe
220 }
221 }
222 '';
223
224 # Write dovecot-acl files to grant bot read-only + flag access to lass's mail
225 systemd.services.dovecot-acl-sync = {
226 description = "Sync dovecot ACL files for bot shared access";
227 after = [ "dovecot.service" ];
228 serviceConfig = {
229 Type = "oneshot";
230 User = "virtualMail";
231 Group = "virtualMail";
232 };
233 # l=lookup, r=read, w=write-flags, s=write-seen (no insert/delete/expunge)
234 script = ''
235 acl_line="user=bot@lassul.us lrws"
236 # Only write ACL in mailbox root dirs, skip cur/new/tmp/notmuch subdirs
237 find /var/vmail/lassul.us/lass/mail -type d \
238 -not -name cur -not -name new -not -name tmp \
239 -not -path '*/.notmuch/*' -not -name .notmuch \
240 -not -path '*/fts-flatcurve/*' -not -name fts-flatcurve \
241 | while IFS= read -r dir; do
242 acl_file="$dir/dovecot-acl"
243 if [ ! -f "$acl_file" ] || [ "$(cat "$acl_file")" != "$acl_line" ]; then
244 echo "$acl_line" > "$acl_file"
245 fi
246 done
247 '';
248 };
249 systemd.timers.dovecot-acl-sync = {
250 wantedBy = [ "timers.target" ];
251 timerConfig = {
252 OnBootSec = "1min";
253 OnUnitActiveSec = "1h";
254 };
255 };
256
257 # notmuch + muchsync + msmtp for CLI mail access
258 environment.systemPackages = [
259 self.packages.${pkgs.system}.notmuch
260 pkgs.muchsync
261 pkgs.msmtp
262 ];
263}