nixos/machines/kaalut/allowlistPass.yaml

@@ -0,0 +1,52 @@
+allowlistPass:
+    matheball: ENC[AES256_GCM,data:4y83ZJ4=,iv:+B1hTSGs5cskmUA9gLpRHPjhxzvwOrplB+lIbNUKtz4=,tag:ZsKA2A4ltbI3px1Z16EgvA==,type:str]
+    mathebau: ENC[AES256_GCM,data:ZlIv0MrCVtsyF3t9Gr/zcg==,iv:ZdBlnx4/zQZjT75ssB0osfDlWVerUe6yvwbMxlXpHZs=,tag:ytlNq7zP2WtPafcSQFZ6RQ==,type:str]
+    mathechor: ENC[AES256_GCM,data:d5KyoD/P8/j+poJSGF1nDA==,iv:ayKtvj4EEqUtMLi/7njbxuUql1A58WNi729svHtZju4=,tag:JqWoxxMN5mVN+gaQTmBv1Q==,type:str]
+    koma: ENC[AES256_GCM,data:bB7px1n5q1+++sctsmIMJg==,iv:DIJGpC9+JyFv3SU9dBVLdnEkRlZzY7DBRAL4zXSbpec=,tag:WaZUGvYtm+5ys2RsBNILog==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age1rasjnr2tlv9y70sj0z0hwpgpxdc974wzg5umtx2pnc6z0p05u3js6r8sln
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBpWW9FZHEwejRaRER1MHJQ
+            VXgyaE1GQmhhNFh1dEtBNjRnZXVqWm5hV25vCjliank4KzFobEZtbitzaXBhT1F6
+            cCtqeVorS1BLMmMzZkVVOEN6NERFdDAKLS0tIGkzUUt1NnBUWUJWTy9Pd2FIeTF0
+            cDVaUHowSEpoRjR3Zm81Z1p5NlYzV1kKMRvC7+3TS5EKjWg/NPnbwvVIikxf+Bpa
+            zNo9jhw3GREMScBXOiarm+xgMZ1e2SRrLrUwfR4DiXI4uvg1Jk/tPg==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1epz92k2rkp43hkrg3u0jgkzhnkwx8y43kag7rvfzwl9wcddelvusyetxl7
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBRYk1LQTVDNGhHWXJZSmsy
+            NEZ0WTNlek4yVnRwL3BKNXYrcm84SzIvNlRZCjlDdXU1a2NRNUVHZmkyK2ltZ3pE
+            bmtmVE5TR1hBcVNhaTBGK2F6VWZ1d2MKLS0tIDVKcXhDbjBncFlsR3FzanRhWWQv
+            Um1jcExjN2RWbHhzY2ZpcWVTWE1IbHMKfRSAmfbk+JDWdhSTSg9GZ+lws5DOHv9T
+            ZO9nQV37X9zFD6sXDWaspG3sf4kJZUCbWjCTKyQL/xmh4+E8+CAXYw==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1dhzugelagj6vge5jjxwwn0522ngf7fhxn04sxy2tm8557rtme5tstprwnj
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBzOXBwTUF3ZXJCTFJOQjVC
+            bGplRDRCQVhtUEJPcnhENEF3UVVnbmVKNnprCjFOZW94ajI2d21RamZKT0xFMmtZ
+            ZzZFYjg3WDBmOVhlaFZyOW83M1NYVXcKLS0tIGltWUJGczNJS0pWTmxaZHU5Wi9t
+            TDRCdStocXRvLzBPUTd2blZFV0IyblkKjufZg39n/TI6BhGhIFNz4jplUx6u3/bo
+            NMbr9uJy/I1sdlfGNaheG/TIGOgFG1KqGkGdwpisU3gUD9uMUo1dvw==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1ktwclxa640l89le6yecm8v2z6hmwr4lusd6x9gyzamhv57887szqtqp59a
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBzdDdsdW44ZlQyMzdJNmsv
+            aTIzVWRoSDhzamlqTDFOemZlc1JQMFdZbFJNCmVZbDVVaDBSVi8yTkdOQ1UySy9X
+            MlhXTzRvNWtqUzQxTlNqQ2RlN2J1OXMKLS0tIC9aZEZMVkFybnRTQmhpM1dzc1lt
+            bDdvdHc3Y1NmeE5WUzl3cXVRc3pmOUkK+9WueS1wDQDJlenec4jJCfynbPnuOFYR
+            HFsWmvEZJ+XhH6N9Q0phCHQgZGiR67FH6CHkCblmb6ZfZcWSEe1oTg==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2025-01-05T13:49:19Z"
+    mac: ENC[AES256_GCM,data:i7t/Hb5aW0lIvPLk84geQ792uUGP25vX8FC7kK/3H19tz5i4zsIcvl1d+oB5gJ004gP5pRogcuKL1xHUUl+A0UXXNzRpxc0BBVZaxnIhjfPunORbmZeJQRP298tQpvYYqI/pGhjrlit37U9jecGf1l12Cgv97sGW42d2F+S2Soc=,iv:My21fMF3SEr6mg2+eh8KA6B8tzmQVEDy2BG3hfkafrU=,tag:xdU6j8ti8Z68rbiRxkj7Pw==,type:str]
+    pgp: []
+    unencrypted_suffix: _unencrypted
+    version: 3.9.2

nixos/machines/kaalut/configuration.nix

@@ -10,6 +10,7 @@
   # System configuration here
   services.mathebau-mail = {
     enable = true;
+    stalwartAdmin = config.sops.secrets.stalwartAdmin.path;
     # see passwd on azathoth for plaintext or machine secret in encoded format for HTTP Basic AUTH
     stalwartAdminHash = "$argon2i$v=19$m=4096,t=3,p=1$d0hYOTkzclpzSmFTZUplWnhVeWE$I7q9uB19RWL0oZKaPlMPSlGfFp6FQ/vrx80FFKCsalg";
     domains = [
@@ -40,7 +41,19 @@
   vmNetwork.ipv4 = "192.168.0.17";
   system.stateVersion = "24.05";
 
-  sops.secrets = {
+  sops.secrets = let
+    allowlistSops = {
+      sopsFile = ./allowlistPass.yaml;
+      owner = "stalwart-mail";
+      group = "stalwart-mail";
+      mode = "0400";
+    };
+  in {
+    # Password for the HRZ API that gets a list of mailaddresses that we serve
+    "allowlistPass/matheball" = allowlistSops;
+    "allowlistPass/mathebau" = allowlistSops;
+    "allowlistPass/mathechor" = allowlistSops;
+    "allowlistPass/koma" = allowlistSops;
     # Virtual alias file
     "mathebau.aliases" = {
       sopsFile = ./mathebau.aliases.yaml;
@@ -60,6 +73,13 @@
       group = "stalwart-mail";
       mode = "0440";
     };
+    # password for https://stalw.art/docs/auth/authorization/administrator/#fallback-administrator encoded to be supplied in the basic auth header
+    stalwartAdmin = {
+      sopsFile = ./stalwartAdmin.yaml;
+      owner = "stalwart-mail";
+      group = "stalwart-mail";
+      mode = "0400";
+    };
     backupKey = {
       sopsFile = ./backupKey.yaml;
       owner = "root";

nixos/machines/kaalut/stalwartAdmin.yaml

@@ -0,0 +1,48 @@
+stalwartAdmin: ENC[AES256_GCM,data:4vpvxtFa2KiF3ojl+cw3ic/MI7UM9JQCQn76bidYvbW31zgF,iv:DtLAi68oQRf3U69uFK0Cz4qHMkxM6NnB3lVYft/DtqQ=,tag:HYm2mdpTuXNHdQIv2Rkwig==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age1rasjnr2tlv9y70sj0z0hwpgpxdc974wzg5umtx2pnc6z0p05u3js6r8sln
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAxcTRqZXRoNTJCdFhQUG9o
+            Qmx2cVl0TWdaQzZZUThTOEpQdjIxVFh3eHhzCjlHWHhSYmM1ajYrdjl3Nm90TkRh
+            YWE3c0hJYzdFWXpZUGI0cHBQdThSWWsKLS0tIFh5M20wV2ZZbzllS1BNOGtaRUVF
+            MFN3bENrZ0tDMllJM1E5MWkyZ2thZEkKfZlUzE5t8K0oHZYOSVItvRJZP2MJlA7N
+            SLozGlpwCoZKWP6qAqP5jisTG/npQRhcqwkd7P39EytO2HXU9m8sJA==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1epz92k2rkp43hkrg3u0jgkzhnkwx8y43kag7rvfzwl9wcddelvusyetxl7
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBkVldRVmtPUzFxV0ltK0d2
+            SHRqbXZCTW5wZUtZM0ZkL3lXOEJmVXdjMXdZCjE5MUUrSEhnWHRSOVhtWWQxdndv
+            ckUzTFl4ZXM5VHBTRlY3SzVsZWpxNUEKLS0tIEtpbTBhaWR1c3RhSW5nclZvMTdO
+            eTBYL1Q5cXNvTGkvQzJMWHZHaEZseVUK5w2MPZMquT0luq+tl2owLrrSBx9KPskS
+            FupcAZTcCo+YsemKLjJ6GlHch5x8Mw98NHS5h1AKxwZYtcfwg3lfbQ==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1dhzugelagj6vge5jjxwwn0522ngf7fhxn04sxy2tm8557rtme5tstprwnj
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBpUitNeHNWOTVjWkF4YWhB
+            MnEwWDFnT0wyNUx3VmlQMmZTRmZRbXBGOVFvCmpoOHZZSXRweUtZaHZ6azF2Q3dK
+            NFBwa242U3JSVjhtOUlRTUZuakhkcXcKLS0tIEN5TGhMRFphdEpvcU5zTmVlTTJN
+            d2JRc2p4YmpuUHAycUoxc1FuZmxhemcKOgGyieFVS57tsvUtVooahqswYZH0Fi6+
+            jxM6Ga/tIM/bZ/qSwYrNlNiz0XHm8/XFH2s8sxypDZ+NHGLs3zGjsw==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1ktwclxa640l89le6yecm8v2z6hmwr4lusd6x9gyzamhv57887szqtqp59a
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBERTdvSTZ3eEVNbEZpUnQ2
+            ZC85blRQVzgrckljcnZPeVhZWUxGd01tankwCjBCZHdWRnpoZkdRQWdoK0VmOFVy
+            VmpiOFkvNisrWmp2NE1kalB4dUhzdWsKLS0tIEJ6T1FsTFlIMUVWd3FwbEtldmlC
+            UjFHWHNZci8zRlFXNVpNNk5oSUNvaTQKW9T88GflSysJwqMnBrc/jZVwL/fRdg2a
+            5XysXb/dCo4uNxLQit/KNSpINj7rAkf4Pk819DO6SKiIiuIJDXw9cA==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2024-11-23T11:43:23Z"
+    mac: ENC[AES256_GCM,data:GZ1Q67n43WU3fDQd6SGsD2EZgoaq1mzh5biy42cx6FQWlveK5lhb0F2HUuWWv5zSHKpslEPD6odvkQmMNCRY8NsvT3+KBAnHHU0aHzM9AEV27cDL4x6oBvO52EMxsNCMm+fXPD1CubQxfbfvx/aIuqb1sovgKGgwf4u6yqIrHJ0=,iv:ExX+ySMXhF/c1w2IP7y8mdlcy8W9Zxiy6X67b2f4AeY=,tag:shxQJdaW3HsG6sNY+zDNCA==,type:str]
+    pgp: []
+    unencrypted_suffix: _unencrypted
+    version: 3.9.1

nixos/modules/mail.nix

@@ -25,6 +25,10 @@
 in {
   options.services.mathebau-mail = {
     enable = mkEnableOption "mathebau mail service";
+    stalwartAdmin = mkOption {
+      type = path;
+      description = "Path to a file that contains the stalwart fallback admin password encoded for HTTP Basic Auth";
+    };
     stalwartAdminHash = mkOption {
       type = str;
       description = "String containing the hashed fallback admin password";
@@ -198,7 +202,60 @@ in {
     };
 
     systemd = {
+      timers."mailAllowlist" = {
+        wantedBy = ["timers.target"];
+        timerConfig = {
+          OnBootSec = "1h"; # Run every hour
+          OnUnitActiveSec = "1h";
+          RandomizedDelaySec = "10m"; # prevent overload on regular intervals
+          Unit = "mailAllowlist.service";
+        };
+      };
       services = {
+        "mailAllowlist" = {
+          description = "Allowlist update: Post the mail addresses to the HRZ allowllist";
+          script = let
+            scriptTemplate = {
+              domain,
+              allowlistPass,
+              ...
+            }: ''
+              echo "process ${domain}"
+              # This line gets the available mailboxes from stalwart's Rest API, searches for their addresses and collects them to a file for submission.
+              ${pkgs.curl}/bin/curl -s --header "authorization: Basic $(<${cfg.stalwartAdmin})" http://localhost/api/principal | ${pkgs.gnugrep}/bin/grep -o -e "[A-Za-z0-9.!#\$%&'*+-/=?^_{|}~]*@${domain}" | tee /tmp/addresses
+              # This line searches for available redirects and adds them to the submission file.
+              ${pkgs.gnugrep}/bin/grep -o -e "[A-Za-z0-9.!#\$%&'*+-/=?^_{|}~]*@${domain}" /tmp/virt_aliases >> /tmp/addresses # This doesn't catch all RFC conform local parts. Improve if you need.
+              # Post local-parts to HRZ, see https://www-cgi.hrz.tu-darmstadt.de/mail/index.php?bereich=whitelist_upload
+              ${pkgs.curl}/bin/curl -s https://www-cgi.hrz.tu-darmstadt.de/mail/whitelist-update.php -F emaildomain=${domain} -F password=$(cat ${allowlistPass}) -F emailliste=@/tmp/addresses -F meldungen=voll
+              # Cleanup submission file
+              rm /tmp/addresses
+            '';
+          in
+            lib.strings.concatStringsSep "" (map scriptTemplate cfg.domains);
+          serviceConfig = {
+            Type = "oneshot";
+            User = "stalwart-mail";
+            NoNewPrivileges = true;
+            # See https://www.man7.org/linux/man-pages/man5/systemd.exec.5.html
+            PrivateTmp = false; # allow access to sieve script
+            ProtectHome = true;
+            ReadOnlyPaths = "/";
+            ReadWritePaths = "/tmp";
+            InaccessiblePaths = "-/lost+found";
+            PrivateDevices = true;
+            PrivateUsers = true;
+            ProtectHostname = true;
+            ProtectClock = true;
+            ProtectKernelTunables = true;
+            ProtectKernelModules = true;
+            ProtectKernelLogs = true;
+            ProtectControlGroups = true;
+            LockPersonality = true;
+            MemoryDenyWriteExecute = true;
+            RestrictRealtime = true;
+            RestrictSUIDSGID = true;
+          };
+        };
         "stalwart-mail" = {
           restartTriggers = lib.attrsets.mapAttrsToList (_: aliaslist: aliaslist.sopsFile) config.sops.secrets; # restart if secrets, especially alias files, have changed.
           serviceConfig.PrivateTmp = lib.mkForce false; # enable access to generated Sieve script