Repository: r-raymond/nixos-mailserver Branch: master Commit: 637c3707c5cf Files: 30 Total size: 114.1 KB Directory structure: gitextract_d0n5qxfj/ ├── .editorconfig ├── .gitignore ├── .travis.yml ├── ISSUE_TEMPLATE.md ├── LICENSE ├── README.md ├── default.nix ├── mail-server/ │ ├── borgbackup.nix │ ├── clamav.nix │ ├── common.nix │ ├── dovecot-version.nix │ ├── dovecot.nix │ ├── environment.nix │ ├── kresd.nix │ ├── monit.nix │ ├── networking.nix │ ├── nginx.nix │ ├── post-upgrade-check.nix │ ├── postfix.nix │ ├── rmilter.nix │ ├── rsnapshot.nix │ ├── services.nix │ ├── systemd.nix │ └── users.nix ├── nixops/ │ ├── single-server.nix │ └── vbox.nix ├── tests/ │ ├── extern.nix │ ├── intern.nix │ └── minimal.nix └── update.sh ================================================ FILE CONTENTS ================================================ ================================================ FILE: .editorconfig ================================================ root = true [*] charset = utf-8 end_of_line = lf indent_style = space indent_size = 2 insert_final_newline = true trim_trailing_whitespace = true ================================================ FILE: .gitignore ================================================ result ================================================ FILE: .travis.yml ================================================ language: nix env: - NIX_PATH="nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-18.03.tar.gz" - NIX_PATH="nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz" script: - nix-build tests/intern.nix - nix-build tests/extern.nix ================================================ FILE: ISSUE_TEMPLATE.md ================================================ (Use this template for bugs, feel free to delete it for other issues) #### SNM Version: (e.g. v2.1.3) #### Nixos Version: (e.g. 17.09 or unstable) #### Relevant part of the config to reproduce: #### What I expected to happen: #### What happened: #### Relevant journald log: ================================================ FILE: LICENSE ================================================ GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. 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If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . ================================================ FILE: README.md ================================================ # ![Simple Nixos MailServer][logo] ![license](https://img.shields.io/badge/license-GPL3-brightgreen.svg) ![status](https://travis-ci.org/r-raymond/nixos-mailserver.svg?branch=master) **THIS REPO IS NOT UPDATED ANYMORE, IT HAS BEEN MOVED TO GITLAB. PLEASE DON'T OPEN ANY MORE PR'S OR ISSUES ON GITHUB** [Link to SNM on Gitlab](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver) ## Stable Releases * [SNM v2.1.4](https://github.com/r-raymond/nixos-mailserver/releases/v2.1.4) [Latest Release (Candidate)](https://github.com/r-raymond/nixos-mailserver/releases/latest) [Subscribe to SNM Announcement List](https://www.freelists.org/list/snm) This is a very low volume list where new releases of SNM are announced, so you can stay up to date with bug fixes and updates. All announcements are signed by the gpg key with fingerprint ``` D9FE 4119 F082 6F15 93BD BD36 6162 DBA5 635E A16A ``` ## Features ### v2.0 * [x] Continous Integration Testing * [x] Multiple Domains * Postfix MTA - [x] smtp on port 25 - [x] submission port 587 - [x] lmtp with dovecot * Dovecot - [x] maildir folders - [x] imap starttls on port 143 - [x] pop3 starttls on port 110 * Certificates - [x] manual certificates - [x] on the fly creation - [x] Let's Encrypt * Spam Filtering - [x] via rspamd * Virus Scanning - [x] via clamav * DKIM Signing - [x] via opendkim * User Management - [x] declarative user management - [x] declarative password management * Sieves - [x] A simple standard script that moves spam - [x] Allow user defined sieve scripts - [x] ManageSieve support * User Aliases - [x] Regular aliases - [x] Catch all aliases ### In the future * DKIM Signing - [ ] Allow a per domain selector ### Changelog See the [mailing list archive](https://www.freelists.org/archive/snm/) ### Quick Start ```nix { config, pkgs, ... }: { imports = [ (builtins.fetchTarball "https://github.com/r-raymond/nixos-mailserver/archive/v2.1.4.tar.gz") ]; mailserver = { enable = true; fqdn = "mail.example.com"; domains = [ "example.com" "example2.com" ]; loginAccounts = { "user1@example.com" = { hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/"; aliases = [ "info@example.com" "postmaster@example.com" "postmaster@example2.com" ]; }; }; }; } ``` For a complete list of options, see `default.nix`. ## How to Set Up a 10/10 Mail Server Guide Check out the [Complete Setup Guide](https://github.com/r-raymond/nixos-mailserver/wiki/A-Complete-Setup-Guide) in the project's wiki. ## How to Backup Checkout the [Complete Backup Guide](https://github.com/r-raymond/nixos-mailserver/wiki/A-Complete-Backup-Guide). Backups are easy with `SNM`. ## Development See the [How to Develop SNM](https://github.com/r-raymond/nixos-mailserver/wiki/How-to-Develop-SNM) wiki page. ## Contributors See the [contributor tab](https://github.com/r-raymond/nixos-mailserver/graphs/contributors) ### Alternative Implementations * [NixCloud Webservices](https://github.com/nixcloud/nixcloud-webservices) ### Credits * send mail graphic by [tnp_dreamingmao](https://thenounproject.com/dreamingmao) from [TheNounProject](https://thenounproject.com/) is licensed under [CC BY 3.0](http://creativecommons.org/~/3.0/) * Logo made with [Logomakr.com](https://logomakr.com) [logo]: logo/logo.png ================================================ FILE: default.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, lib, pkgs, ... }: with lib; let cfg = config.mailserver; in { options.mailserver = { enable = mkEnableOption "nixos-mailserver"; fqdn = mkOption { type = types.str; example = "mx.example.com"; description = "The fully qualified domain name of the mail server."; }; domains = mkOption { type = types.listOf types.str; example = [ "example.com" ]; default = []; description = "The domains that this mail server serves."; }; loginAccounts = mkOption { type = types.loaOf (types.submodule ({ name, ... }: { options = { name = mkOption { type = types.str; example = "user1@example.com"; description = "Username"; }; hashedPassword = mkOption { type = types.str; example = "$6$evQJs5CFQyPAW09S$Cn99Y8.QjZ2IBnSu4qf1vBxDRWkaIZWOtmu1Ddsm3.H3CFpeVc0JU4llIq8HQXgeatvYhh5O33eWG3TSpjzu6/"; description = '' Hashed password. Use `mkpasswd` as follows ``` mkpasswd -m sha-512 "super secret password" ``` ''; }; aliases = mkOption { type = with types; listOf types.str; example = ["abuse@example.com" "postmaster@example.com"]; default = []; description = '' A list of aliases of this login account. Note: Use list entries like "@example.com" to create a catchAll that allows sending from all email addresses in these domain. ''; }; catchAll = mkOption { type = with types; listOf (enum cfg.domains); example = ["example.com" "example2.com"]; default = []; description = '' For which domains should this account act as a catch all? Note: Does not allow sending from all addresses of these domains. ''; }; quota = mkOption { type = with types; nullOr types.str; default = null; example = "2G"; description = '' Per user quota rules. Accepted sizes are `xx k/M/G/T` with the obvious meaning. Leave blank for the standard quota `100G`. ''; }; sieveScript = mkOption { type = with types; nullOr lines; default = null; example = '' require ["fileinto", "mailbox"]; if address :is "from" "notifications@github.com" { fileinto :create "GitHub"; stop; } # This must be the last rule, it will check if list-id is set, and # file the message into the Lists folder for further investigation elsif header :matches "list-id" "" { fileinto :create "Lists"; stop; } ''; description = '' Per-user sieve script. ''; }; }; config.name = mkDefault name; })); example = { user1 = { hashedPassword = "$6$evQJs5CFQyPAW09S$Cn99Y8.QjZ2IBnSu4qf1vBxDRWkaIZWOtmu1Ddsm3.H3CFpeVc0JU4llIq8HQXgeatvYhh5O33eWG3TSpjzu6/"; }; user2 = { hashedPassword = "$6$oE0ZNv2n7Vk9gOf$9xcZWCCLGdMflIfuA0vR1Q1Xblw6RZqPrP94mEit2/81/7AKj2bqUai5yPyWE.QYPyv6wLMHZvjw3Rlg7yTCD/"; }; }; description = '' The login account of the domain. Every account is mapped to a unix user, e.g. `user1@example.com`. To generate the passwords use `mkpasswd` as follows ``` mkpasswd -m sha-512 "super secret password" ``` ''; default = {}; }; extraVirtualAliases = mkOption { type = types.loaOf (mkOptionType { name = "Login Account"; check = (ele: let accounts = builtins.attrNames cfg.loginAccounts; in if (builtins.isList ele) then (builtins.all (x: builtins.elem x accounts) ele) && (builtins.length ele > 0) else (builtins.elem ele accounts)); }); example = { "info@example.com" = "user1@example.com"; "postmaster@example.com" = "user1@example.com"; "abuse@example.com" = "user1@example.com"; "multi@example.com" = [ "user1@example.com" "user2@example.com" ]; }; description = '' Virtual Aliases. A virtual alias `"info@example.com" = "user1@example.com"` means that all mail to `info@example.com` is forwarded to `user1@example.com`. Note that it is expected that `postmaster@example.com` and `abuse@example.com` is forwarded to some valid email address. (Alternatively you can create login accounts for `postmaster` and (or) `abuse`). Furthermore, it also allows the user `user1@example.com` to send emails as `info@example.com`. It's also possible to create an alias for multiple accounts. In this example all mails for `multi@example.com` will be forwarded to both `user1@example.com` and `user2@example.com`. ''; default = {}; }; rejectRecipients = mkOption { type = types.listOf types.str; example = [ "sales@example.com" "info@example.com" ]; description = '' Reject emails addressed to these local addresses from unauthorized senders. Use if a spammer has found email addresses in a catchall domain but you do not want to disable the catchall. ''; default = []; }; vmailUID = mkOption { type = types.int; default = 5000; description = '' The unix UID of the virtual mail user. Be mindful that if this is changed, you will need to manually adjust the permissions of mailDirectory. ''; }; vmailUserName = mkOption { type = types.str; default = "virtualMail"; description = '' The user name and group name of the user that owns the directory where all the mail is stored. ''; }; vmailGroupName = mkOption { type = types.str; default = "virtualMail"; description = '' The user name and group name of the user that owns the directory where all the mail is stored. ''; }; mailDirectory = mkOption { type = types.path; default = "/var/vmail"; description = '' Where to store the mail. ''; }; useFsLayout = mkOption { type = types.bool; default = false; description = '' Sets whether dovecot should organize mail in subdirectories: - /var/vmail/example.com/user/.folder.subfolder/ (default layout) - /var/vmail/example.com/user/folder/subfolder/ (FS layout) See https://wiki2.dovecot.org/MailboxFormat/Maildir for details. ''; }; hierarchySeparator = mkOption { type = types.string; default = "."; description = '' The hierarchy separator for mailboxes used by dovecot for the namespace 'inbox'. Dovecot defaults to "." but recommends "/". This affects how mailboxes appear to mail clients and sieve scripts. For instance when using "." then in a sieve script "example.com" would refer to the mailbox "com" in the parent mailbox "example". This does not determine the way your mails are stored on disk. See https://wiki.dovecot.org/Namespaces for details. ''; }; mailboxes = mkOption { description = '' The mailboxes for dovecot. Depending on the mail client used it might be necessary to change some mailbox's name. ''; default = [ { name = "Trash"; auto = "no"; specialUse = "Trash"; } { name = "Junk"; auto = "subscribe"; specialUse = "Junk"; } { name = "Drafts"; auto = "subscribe"; specialUse = "Drafts"; } { name = "Sent"; auto = "subscribe"; specialUse = "Sent"; } ]; }; certificateScheme = mkOption { type = types.enum [ 1 2 3 ]; default = 2; description = '' Certificate Files. There are three options for these. 1) You specify locations and manually copy certificates there. 2) You let the server create new (self signed) certificates on the fly. 3) You let the server create a certificate via `Let's Encrypt`. Note that this implies that a stripped down webserver has to be started. This also implies that the FQDN must be set as an `A` record to point to the IP of the server. In particular port 80 on the server will be opened. For details on how to set up the domain records, see the guide in the readme. ''; }; certificateFile = mkOption { type = types.path; example = "/root/mail-server.crt"; description = '' Scheme 1) Location of the certificate ''; }; keyFile = mkOption { type = types.path; example = "/root/mail-server.key"; description = '' Scheme 1) Location of the key file ''; }; certificateDirectory = mkOption { type = types.path; default = "/var/certs"; description = '' Sceme 2) This is the folder where the certificate will be created. The name is hardcoded to "cert-.pem" and "key-.pem" and the certificate is valid for 10 years. ''; }; enableImap = mkOption { type = types.bool; default = true; description = '' Whether to enable imap / pop3. Both variants are only supported in the (sane) startTLS configuration. The ports are 110 - Pop3 143 - IMAP 587 - SMTP with login ''; }; enableImapSsl = mkOption { type = types.bool; default = false; description = '' Whether to enable IMAPS, setting this option to true will open port 993 in the firewall. ''; }; enablePop3 = mkOption { type = types.bool; default = false; description = '' Whether to enable POP3. Both variants are only supported in the (sane) startTLS configuration. The ports are 110 - Pop3 143 - IMAP 587 - SMTP with login ''; }; enablePop3Ssl = mkOption { type = types.bool; default = false; description = '' Whether to enable POP3S, setting this option to true will open port 995 in the firewall. ''; }; enableManageSieve = mkOption { type = types.bool; default = false; description = '' Whether to enable ManageSieve, setting this option to true will open port 4190 in the firewall. The ManageSieve protocol allows users to manage their Sieve scripts on a remote server with a supported client, including Thunderbird. ''; }; virusScanning = mkOption { type = types.bool; default = false; description = '' Whether to activate virus scanning. Note that virus scanning is _very_ expensive memory wise. ''; }; dkimSigning = mkOption { type = types.bool; default = true; description = '' Whether to activate dkim signing. ''; }; dkimSelector = mkOption { type = types.str; default = "mail"; description = '' ''; }; dkimKeyDirectory = mkOption { type = types.path; default = "/var/dkim"; description = '' ''; }; dhParamBitLength = mkOption { type = types.int; default = 2048; description = '' Length of the Diffie Hillman prime used (in bits). It might be a good idea to set this to 4096 for security purposed, but it will take a _very_ long time to create this prime on startup. ''; }; debug = mkOption { type = types.bool; default = false; description = '' Whether to enable verbose logging for mailserver related services. This intended be used for development purposes only, you probably don't want to enable this unless you're hacking on nixos-mailserver. ''; }; maxConnectionsPerUser = mkOption { type = types.int; default = 100; description = '' Maximum number of IMAP/POP3 connections allowed for a user from each IP address. E.g. a value of 50 allows for 50 IMAP and 50 POP3 connections at the same time for a single user. ''; }; localDnsResolver = mkOption { type = types.bool; default = true; description = '' Runs a local DNS resolver (kresd) as recommended when running rspamd. This prevents your log file from filling up with rspamd_monitored_dns_mon entries. ''; }; rewriteMessageId = mkOption { type = types.bool; default = false; description = '' Rewrites the Message-ID's hostname-part of outgoing emails to the FQDN. Please be aware that this may cause problems with some mail clients relying on the original Message-ID. ''; }; monitoring = { enable = mkEnableOption "monitoring via monit"; alertAddress = mkOption { type = types.string; description = '' The email address to send alerts to. ''; }; config = mkOption { type = types.string; default = '' set daemon 120 with start delay 60 set mailserver localhost set httpd port 2812 and use address localhost allow localhost allow admin:obwjoawijerfoijsiwfj29jf2f2jd check filesystem root with path / if space usage > 80% then alert if inode usage > 80% then alert check system $HOST if cpu usage > 95% for 10 cycles then alert if memory usage > 75% for 5 cycles then alert if swap usage > 20% for 10 cycles then alert if loadavg (1min) > 90 for 15 cycles then alert if loadavg (5min) > 80 for 10 cycles then alert if loadavg (15min) > 70 for 8 cycles then alert check process sshd with pidfile /var/run/sshd.pid start program "${pkgs.systemd}/bin/systemctl start sshd" stop program "${pkgs.systemd}/bin/systemctl stop sshd" if failed port 22 protocol ssh for 2 cycles then restart check process postfix with pidfile /var/lib/postfix/queue/pid/master.pid start program = "${pkgs.systemd}/bin/systemctl start postfix" stop program = "${pkgs.systemd}/bin/systemctl stop postfix" if failed port 25 protocol smtp for 5 cycles then restart check process dovecot with pidfile /var/run/dovecot2/master.pid start program = "${pkgs.systemd}/bin/systemctl start dovecot2" stop program = "${pkgs.systemd}/bin/systemctl stop dovecot2" if failed host ${cfg.fqdn} port 993 type tcpssl sslauto protocol imap for 5 cycles then restart check process rspamd with pidfile /var/run/rspamd.pid start program = "${pkgs.systemd}/bin/systemctl start rspamd" stop program = "${pkgs.systemd}/bin/systemctl stop rspamd" ''; description = '' The configuration used for monitoring via monit. Use a mail address that you actively check and set it via 'set alert ...'. ''; }; }; borgbackup = { enable = mkEnableOption "backup via borgbackup"; repoLocation = mkOption { type = types.string; default = "/var/borgbackup"; description = '' The location where borg saves the backups. This can be a local path or a remote location such as user@host:/path/to/repo. It is exported and thus available as an environment variable to cmdPreexec and cmdPostexec. ''; }; startAt = mkOption { type = types.string; default = "hourly"; description = "When or how often the backup should run. Must be in the format described in systemd.time 7."; }; user = mkOption { type = types.string; default = "virtualMail"; description = "The user borg and its launch script is run as."; }; group = mkOption { type = types.string; default = "virtualMail"; description = "The group borg and its launch script is run as."; }; compression = { method = mkOption { type = types.nullOr (types.enum ["none" "lz4" "zstd" "zlib" "lzma"]); default = null; description = "Leaving this unset allows borg to choose. The default for borg 1.1.4 is lz4."; }; level = mkOption { type = types.nullOr types.int; default = null; description = '' Denotes the level of compression used by borg. Most methods accept levels from 0 to 9 but zstd which accepts values from 1 to 22. If null the decision is left up to borg. ''; }; auto = mkOption { type = types.bool; default = false; description = "Leaves it to borg to determine whether an individual file should be compressed."; }; }; encryption = { method = mkOption { type = types.enum [ "none" "authenticated" "authenticated-blake2" "repokey" "keyfile" "repokey-blake2" "keyfile-blake2" ]; default = "none"; description = '' The backup can be encrypted by choosing any other value than 'none'. When using encryption the password / passphrase must be provided in passphraseFile. ''; }; passphraseFile = mkOption { type = types.nullOr types.path; default = null; }; }; name = mkOption { type = types.string; default = "{hostname}-{user}-{now}"; description = '' The name of the individual backups as used by borg. Certain placeholders will be replaced by borg. ''; }; locations = mkOption { type = types.listOf types.path; default = [cfg.mailDirectory]; description = "The locations that are to be backed up by borg."; }; extraArgumentsForInit = mkOption { type = types.listOf types.string; default = ["--critical"]; description = "Additional arguments to add to the borg init command line."; }; extraArgumentsForCreate = mkOption { type = types.listOf types.string; default = [ ]; description = "Additional arguments to add to the borg create command line e.g. '--stats'."; }; cmdPreexec = mkOption { type = types.nullOr types.string; default = null; description = '' The command to be executed before each backup operation. This is called prior to borg init in the same script that runs borg init and create and cmdPostexec. Example: export BORG_RSH="ssh -i /path/to/private/key" ''; }; cmdPostexec = mkOption { type = types.nullOr types.string; default = null; description = '' The command to be executed after each backup operation. This is called after borg create completed successfully and in the same script that runs cmdPreexec, borg init and create. ''; }; }; rebootAfterKernelUpgrade = { enable = mkOption { type = types.bool; default = false; example = true; description = '' Whether to enable automatic reboot after kernel upgrades. This is to be used in conjunction with system.autoUpgrade.enable = true" ''; }; method = mkOption { type = types.enum [ "reboot" "systemctl kexec" ]; default = "reboot"; description = '' Whether to issue a full "reboot" or just a "systemctl kexec"-only reboot. It is recommended to use the default value because the quicker kexec reboot has a number of problems. Also if your server is running in a virtual machine the regular reboot will already be very quick. ''; }; }; backup = { enable = mkEnableOption "backup via rsnapshot"; snapshotRoot = mkOption { type = types.path; default = "/var/rsnapshot"; description = '' The directory where rsnapshot stores the backup. ''; }; cmdPreexec = mkOption { type = types.nullOr types.string; default = null; description = '' The command to be executed before each backup operation. This is wrapped in a shell script to be called by rsnapshot. ''; }; cmdPostexec = mkOption { type = types.nullOr types.string; default = null; description = "The command to be executed after each backup operation. This is wrapped in a shell script to be called by rsnapshot."; }; retain = { hourly = mkOption { type = types.int; default = 24; description = "How many hourly snapshots are retained."; }; daily = mkOption { type = types.int; default = 7; description = "How many daily snapshots are retained."; }; weekly = mkOption { type = types.int; default = 54; description = "How many weekly snapshots are retained."; }; }; cronIntervals = mkOption { type = types.attrsOf types.string; default = { # minute, hour, day-in-month, month, weekday (0 = sunday) hourly = " 0 * * * *"; # Every full hour daily = "30 3 * * *"; # Every day at 3:30 weekly = " 0 5 * * 0"; # Every sunday at 5:00 AM }; description = '' Periodicity at which intervals should be run by cron. Note that the intervals also have to exist in configuration as retain options. ''; }; }; }; imports = [ ./mail-server/borgbackup.nix ./mail-server/rsnapshot.nix ./mail-server/clamav.nix ./mail-server/monit.nix ./mail-server/users.nix ./mail-server/environment.nix ./mail-server/networking.nix ./mail-server/systemd.nix ./mail-server/dovecot.nix ./mail-server/postfix.nix ./mail-server/rmilter.nix ./mail-server/nginx.nix ./mail-server/kresd.nix ./mail-server/post-upgrade-check.nix ]; } ================================================ FILE: mail-server/borgbackup.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver.borgbackup; methodFragment = lib.optional (cfg.compression.method != null) cfg.compression.method; autoFragment = if cfg.compression.auto && cfg.compression.method == null then throw "compression.method must be set when using auto." else lib.optional cfg.compression.auto "auto"; levelFragment = if cfg.compression.level != null && cfg.compression.method == null then throw "compression.method must be set when using compression.level." else lib.optional (cfg.compression.level != null) (toString cfg.compression.level); compressionFragment = lib.concatStringsSep "," (lib.flatten [autoFragment methodFragment levelFragment]); compression = lib.optionalString (compressionFragment != "") "--compression ${compressionFragment}"; encryptionFragment = cfg.encryption.method; passphraseFile = lib.escapeShellArg cfg.encryption.passphraseFile; passphraseFragment = lib.optionalString (cfg.encryption.method != "none") (if cfg.encryption.passphraseFile != null then ''env BORG_PASSPHRASE="$(cat ${passphraseFile})"'' else throw "passphraseFile must be set when using encryption."); locations = lib.escapeShellArgs cfg.locations; name = lib.escapeShellArg cfg.name; repoLocation = lib.escapeShellArg cfg.repoLocation; extraInitArgs = lib.escapeShellArgs cfg.extraArgumentsForInit; extraCreateArgs = lib.escapeShellArgs cfg.extraArgumentsForCreate; cmdPreexec = lib.optionalString (cfg.cmdPreexec != null) cfg.cmdPreexec; cmdPostexec = lib.optionalString (cfg.cmdPostexec != null) cfg.cmdPostexec; borgScript = '' export BORG_REPO=${repoLocation} ${cmdPreexec} ${passphraseFragment} ${pkgs.borgbackup}/bin/borg init ${extraInitArgs} --encryption ${encryptionFragment} || true ${passphraseFragment} ${pkgs.borgbackup}/bin/borg create ${extraCreateArgs} ${compression} ::${name} ${locations} ${cmdPostexec} ''; in { config = lib.mkIf (config.mailserver.enable && cfg.enable) { environment.systemPackages = with pkgs; [ borgbackup ]; systemd.services.borgbackup = { description = "borgbackup"; unitConfig.Documentation = "man:borgbackup"; script = borgScript; serviceConfig = { User = cfg.user; Group = cfg.group; CPUSchedulingPolicy = "idle"; IOSchedulingClass = "idle"; ProtectSystem = "full"; }; startAt = cfg.startAt; }; }; } ================================================ FILE: mail-server/clamav.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; in { config = lib.mkIf (cfg.enable && cfg.virusScanning) { services.clamav.daemon.enable = true; services.clamav.updater.enable = true; services.clamav.daemon.extraConfig = '' PhishingScanURLs no ''; }; } ================================================ FILE: mail-server/common.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, lib }: let cfg = config.mailserver; # passwd :: [ String ] passwd = lib.mapAttrsToList (name: value: "${name}:${value.hashedPassword}:${builtins.toString cfg.vmailUID}:${builtins.toString cfg.vmailUID}::${cfg.mailDirectory}:/run/current-system/sw/bin/nologin:" + (if lib.isString value.quota then "userdb_quota_rule=*:storage=${value.quota}" else "")) cfg.loginAccounts; in { # cert :: PATH certificatePath = if cfg.certificateScheme == 1 then cfg.certificateFile else if cfg.certificateScheme == 2 then "${cfg.certificateDirectory}/cert-${cfg.fqdn}.pem" else if cfg.certificateScheme == 3 then "/var/lib/acme/${cfg.fqdn}/fullchain.pem" else throw "Error: Certificate Scheme must be in { 1, 2, 3 }"; # key :: PATH keyPath = if cfg.certificateScheme == 1 then cfg.keyFile else if cfg.certificateScheme == 2 then "${cfg.certificateDirectory}/key-${cfg.fqdn}.pem" else if cfg.certificateScheme == 3 then "/var/lib/acme/${cfg.fqdn}/key.pem" else throw "Error: Certificate Scheme must be in { 1, 2, 3 }"; # passwdFile :: PATH passwdFile = builtins.toFile "passwd" (lib.concatStringsSep "\n" passwd); } ================================================ FILE: mail-server/dovecot-version.nix ================================================ { dovecot, gawk, gnused, jq, runCommand }: runCommand "dovecot-version" { buildInputs = [dovecot gnused jq]; } '' jq -n \ --arg dovecot_version "$(dovecot --version | sed 's/\([0-9.]*\).*/\1/' | awk -F '.' '{ print $1"."$2"."$3 }')" \ '[$dovecot_version | split("."), ["major", "minor", "patch"]] | transpose | map( { (.[1]): .[0] | tonumber }) | add' > $out '' ================================================ FILE: mail-server/dovecot.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: with (import ./common.nix { inherit config lib; }); let cfg = config.mailserver; maildirLayoutAppendix = lib.optionalString cfg.useFsLayout ":LAYOUT=fs"; dovecotVersion = builtins.fromJSON (builtins.readFile (pkgs.callPackage ./dovecot-version.nix {})); # maildir in format "/${domain}/${user}" dovecotMaildir = "maildir:${cfg.mailDirectory}/%d/%n${maildirLayoutAppendix}"; in { config = with cfg; lib.mkIf enable { services.dovecot2 = { enable = true; enableImap = enableImap; enablePop3 = enablePop3; enablePAM = false; enableQuota = true; mailGroup = vmailGroupName; mailUser = vmailUserName; mailLocation = dovecotMaildir; sslServerCert = certificatePath; sslServerKey = keyPath; enableLmtp = true; modules = [ pkgs.dovecot_pigeonhole ]; protocols = [ "sieve" ]; sieveScripts = { after = builtins.toFile "spam.sieve" '' require "fileinto"; if header :is "X-Spam" "Yes" { fileinto "Junk"; stop; } ''; }; mailboxes = cfg.mailboxes; extraConfig = '' #Extra Config ${lib.optionalString debug '' mail_debug = yes auth_debug = yes verbose_ssl = yes ''} protocol imap { mail_max_userip_connections = ${toString cfg.maxConnectionsPerUser} } protocol pop3 { mail_max_userip_connections = ${toString cfg.maxConnectionsPerUser} } mail_access_groups = ${vmailGroupName} ssl = required ${lib.optionalString (dovecotVersion.major == 2 && dovecotVersion.minor >= 3) '' ssl_dh = <${certificateDirectory}/dh.pem ''} service lmtp { unix_listener /var/lib/postfix/queue/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix # TODO: < make variable } } protocol lmtp { mail_plugins = $mail_plugins sieve } passdb { driver = passwd-file args = ${passwdFile} } userdb { driver = passwd-file args = ${passwdFile} } service auth { unix_listener /var/lib/postfix/queue/private/auth { mode = 0660 user = postfix # TODO: < make variable group = postfix # TODO: < make variable } } auth_mechanisms = plain login namespace inbox { separator = ${cfg.hierarchySeparator} inbox = yes } plugin { sieve = file:/var/sieve/%u/scripts;active=/var/sieve/%u/active.sieve sieve_default = file:/var/sieve/%u/default.sieve sieve_default_name = default } lda_mailbox_autosubscribe = yes lda_mailbox_autocreate = yes ''; }; }; } ================================================ FILE: mail-server/environment.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; in { config = with cfg; lib.mkIf enable { environment.systemPackages = with pkgs; [ dovecot opendkim openssh postfix rspamd rmilter ] ++ (if certificateScheme == 2 then [ openssl ] else []); }; } ================================================ FILE: mail-server/kresd.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2017 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; in { config = lib.mkIf (cfg.enable && cfg.localDnsResolver) { services.kresd.enable = true; networking.nameservers = [ "127.0.0.1" ]; }; } ================================================ FILE: mail-server/monit.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; in { config = lib.mkIf (cfg.enable && cfg.monitoring.enable) { services.monit = { enable = true; config = '' set alert ${cfg.monitoring.alertAddress} ${cfg.monitoring.config} ''; }; }; } ================================================ FILE: mail-server/networking.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; in { config = with cfg; lib.mkIf enable { networking.firewall = { allowedTCPPorts = [ 25 587 ] ++ lib.optional enableImap 143 ++ lib.optional enableImapSsl 993 ++ lib.optional enablePop3 110 ++ lib.optional enablePop3Ssl 995 ++ lib.optional enableManageSieve 4190 ++ lib.optional (certificateScheme == 3) 80; }; }; } ================================================ FILE: mail-server/nginx.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: with (import ./common.nix { inherit config; }); let cfg = config.mailserver; acmeRoot = "/var/lib/acme/acme-challenge"; in { config = lib.mkIf (cfg.enable && cfg.certificateScheme == 3) { services.nginx = { enable = true; virtualHosts."${cfg.fqdn}" = { serverName = cfg.fqdn; forceSSL = true; enableACME = true; acmeRoot = acmeRoot; }; }; security.acme.certs."${cfg.fqdn}".postRun = '' systemctl reload nginx systemctl reload postfix systemctl reload dovecot2 ''; }; } ================================================ FILE: mail-server/post-upgrade-check.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: with lib; let cfg = config.mailserver; in { config = mkIf (cfg.enable && cfg.rebootAfterKernelUpgrade.enable) { systemd.services.nixos-upgrade.serviceConfig.ExecStartPost = pkgs.writeScript "post-upgrade-check" '' #!${pkgs.stdenv.shell} # Checks whether the "current" kernel is different from the booted kernel # and then triggers a reboot so that the "current" kernel will be the booted one. # This is just an educated guess. If the links do not differ the kernels might still be different, according to spacefrogg in #nixos. current=$(readlink -f /run/current-system/kernel) booted=$(readlink -f /run/booted-system/kernel) if [ "$current" == "$booted" ]; then echo "kernel version seems unchanged, skipping reboot" | systemd-cat --priority 4 --identifier "post-upgrade-check"; else echo "kernel path changed, possibly a new version" | systemd-cat --priority 2 --identifier "post-upgrade-check" echo "$booted" | systemd-cat --priority 2 --identifier "post-upgrade-kernel-check" echo "$current" | systemd-cat --priority 2 --identifier "post-upgrade-kernel-check" ${cfg.rebootAfterKernelUpgrade.method} fi ''; }; } ================================================ FILE: mail-server/postfix.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: with (import ./common.nix { inherit config lib; }); let inherit (lib.strings) concatStringsSep; cfg = config.mailserver; # valiases_postfix :: [ String ] valiases_postfix = lib.flatten (lib.mapAttrsToList (name: value: let to = name; in map (from: "${from} ${to}") (value.aliases ++ lib.singleton name)) cfg.loginAccounts); # catchAllPostfix :: [ String ] catchAllPostfix = lib.flatten (lib.mapAttrsToList (name: value: let to = name; in map (from: "@${from} ${to}") value.catchAll) cfg.loginAccounts); # extra_valiases_postfix :: [ String ] extra_valiases_postfix = (map (from: let to = cfg.extraVirtualAliases.${from}; aliasList = (l: let aliasStr = builtins.foldl' (x: y: x + y + ", ") "" l; in builtins.substring 0 (builtins.stringLength aliasStr - 2) aliasStr); in if (builtins.isList to) then "${from} " + (aliasList to) else "${from} ${to}") (builtins.attrNames cfg.extraVirtualAliases)); # all_valiases_postfix :: [ String ] all_valiases_postfix = valiases_postfix ++ extra_valiases_postfix; # valiases_file :: Path valiases_file = builtins.toFile "valias" (lib.concatStringsSep "\n" (all_valiases_postfix ++ catchAllPostfix)); reject_recipients_postfix = (map (recipient: "${recipient} REJECT") (cfg.rejectRecipients)); # rejectRecipients :: [ Path ] reject_recipients_file = builtins.toFile "reject_recipients" (lib.concatStringsSep "\n" (reject_recipients_postfix)) ; # vhosts_file :: Path vhosts_file = builtins.toFile "vhosts" (concatStringsSep "\n" cfg.domains); # vaccounts_file :: Path # see # https://blog.grimneko.de/2011/12/24/a-bunch-of-tips-for-improving-your-postfix-setup/ # for details on how this file looks. By using the same file as valiases, # every alias is owned (uniquely) by its user. # The user's own address is already in all_valiases_postfix. vaccounts_file = builtins.toFile "vaccounts" (lib.concatStringsSep "\n" all_valiases_postfix); submissionHeaderCleanupRules = pkgs.writeText "submission_header_cleanup_rules" ('' # Removes sensitive headers from mails handed in via the submission port. # See https://thomas-leister.de/mailserver-debian-stretch/ # Uses "pcre" style regex. /^Received:/ IGNORE /^X-Originating-IP:/ IGNORE /^X-Mailer:/ IGNORE /^User-Agent:/ IGNORE /^X-Enigmail:/ IGNORE '' + lib.optionalString cfg.rewriteMessageId '' # Replaces the user submitted hostname with the server's FQDN to hide the # user's host or network. /^Message-ID:\s+<(.*?)@.*?>/ REPLACE Message-ID: <$1@${cfg.fqdn}> ''); in { config = with cfg; lib.mkIf enable { services.postfix = { enable = true; hostname = "${fqdn}"; networksStyle = "host"; mapFiles."valias" = valiases_file; mapFiles."vaccounts" = vaccounts_file; mapFiles."reject_recipients" = reject_recipients_file; sslCert = certificatePath; sslKey = keyPath; enableSubmission = true; extraConfig = '' # Extra Config mydestination = smtpd_banner = ${fqdn} ESMTP NO UCE disable_vrfy_command = yes message_size_limit = 20971520 # virtual mail system virtual_uid_maps = static:5000 virtual_gid_maps = static:5000 virtual_mailbox_base = ${mailDirectory} virtual_mailbox_domains = ${vhosts_file} virtual_mailbox_maps = hash:/var/lib/postfix/conf/valias virtual_alias_maps = hash:/var/lib/postfix/conf/valias virtual_transport = lmtp:unix:private/dovecot-lmtp # sasl with dovecot smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_auth_enable = yes smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination # reject selected recipients, quota smtpd_recipient_restrictions = check_recipient_access hash:/var/lib/postfix/conf/reject_recipients, check_policy_service inet:localhost:12340 # TLS settings, inspired by https://github.com/jeaye/nix-files # Submission by mail clients is handled in submissionOptions smtpd_tls_security_level = may # strong might suffice and is computationally less expensive smtpd_tls_eecdh_grade = ultra # Disable predecessors to TLS smtpd_tls_protocols = !SSLv2, !SSLv3 # Allowing AUTH on a non encrypted connection poses a security risk smtpd_tls_auth_only = yes # Log only a summary message on TLS handshake completion smtpd_tls_loglevel = 1 # Disable weak ciphers as reported by https://ssl-tools.net # https://serverfault.com/questions/744168/how-to-disable-rc4-on-postfix smtpd_tls_exclude_ciphers = RC4, aNULL smtp_tls_exclude_ciphers = RC4, aNULL # Configure a non blocking source of randomness tls_random_source = dev:/dev/urandom ''; submissionOptions = { smtpd_tls_security_level = "encrypt"; smtpd_sasl_auth_enable = "yes"; smtpd_sasl_type = "dovecot"; smtpd_sasl_path = "private/auth"; smtpd_sasl_security_options = "noanonymous"; smtpd_sasl_local_domain = "$myhostname"; smtpd_client_restrictions = "permit_sasl_authenticated,reject"; smtpd_sender_login_maps = "hash:/etc/postfix/vaccounts"; smtpd_sender_restrictions = "reject_sender_login_mismatch"; smtpd_recipient_restrictions = "reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject"; cleanup_service_name = "submission-header-cleanup"; }; extraMasterConf = '' submission-header-cleanup unix n - n - 0 cleanup -o header_checks=pcre:${submissionHeaderCleanupRules} ''; }; }; } ================================================ FILE: mail-server/rmilter.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; clamav = if cfg.virusScanning then '' clamav { servers = /var/run/clamav/clamd.ctl; }; '' else ""; dkim = if cfg.dkimSigning # Note: domain = "*"; causes Rmilter to try to search key in the key path # as keypath/domain.selector.key for any domain. then '' dkim { domain { key = "${cfg.dkimKeyDirectory}"; domain = "*"; selector = "${cfg.dkimSelector}"; }; sign_alg = sha256; auth_only = yes; header_canon = relaxed; } '' else ""; in { config = with cfg; lib.mkIf enable { services.rspamd = { enable = true; }; services.rmilter = { inherit debug; enable = true; postfix.enable = true; rspamd = { enable = true; extraConfig = "extended_spam_headers = yes;"; }; extraConfig = '' use_redis = true; max_size = 20M; ${clamav} ${dkim} ''; }; }; } ================================================ FILE: mail-server/rsnapshot.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: with lib; let cfg = config.mailserver; preexecDefined = cfg.backup.cmdPreexec != null; preexecWrapped = pkgs.writeScript "rsnapshot-preexec.sh" '' #!${pkgs.stdenv.shell} set -e ${cfg.backup.cmdPreexec} ''; preexecString = optionalString preexecDefined "cmd_preexec ${preexecWrapped}"; postexecDefined = cfg.backup.cmdPostexec != null; postexecWrapped = pkgs.writeScript "rsnapshot-postexec.sh" '' #!${pkgs.stdenv.shell} set -e ${cfg.backup.cmdPostexec} ''; postexecString = optionalString postexecDefined "cmd_postexec ${postexecWrapped}"; in { config = mkIf (cfg.enable && cfg.backup.enable) { services.rsnapshot = { enable = true; cronIntervals = cfg.backup.cronIntervals; # rsnapshot expects intervals shortest first, e.g. hourly first, then daily. # tabs must separate all elements extraConfig = '' ${preexecString} ${postexecString} snapshot_root ${cfg.backup.snapshotRoot}/ retain hourly ${toString cfg.backup.retain.hourly} retain daily ${toString cfg.backup.retain.daily} retain weekly ${toString cfg.backup.retain.weekly} backup ${cfg.mailDirectory}/ localhost/ ''; }; }; } ================================================ FILE: mail-server/services.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; # cert :: PATH cert = if cfg.certificateScheme == 1 then cfg.certificateFile else if cfg.certificateScheme == 2 then "${cfg.certificateDirectory}/cert-${cfg.fqdn.pem" else ""; # key :: PATH key = if cfg.certificateScheme == 1 then cfg.keyFile else if cfg.certificateScheme == 2 then "${cfg.certificateDirectory}/key-${cfg.fqdn}.pem" else ""; in { imports = [ ./rmilter.nix ./postfix.nix key ./dovecot.nix ]; } ================================================ FILE: mail-server/systemd.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: let cfg = config.mailserver; create_certificate = if cfg.certificateScheme == 2 then '' # Create certificates if they do not exist yet dir="${cfg.certificateDirectory}" fqdn="${cfg.fqdn}" case $fqdn in /*) fqdn=$(cat "$fqdn");; esac key="''${dir}/key-${cfg.fqdn}.pem"; cert="''${dir}/cert-${cfg.fqdn}.pem"; if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ] then mkdir -p "${cfg.certificateDirectory}" (umask 077; "${pkgs.openssl}/bin/openssl" genrsa -out "''${key}" 2048) && "${pkgs.openssl}/bin/openssl" req -new -key "''${key}" -x509 -subj "/CN=''${fqdn}" \ -days 3650 -out "''${cert}" fi '' else ""; createDhParameterFile = '' # Create a dh parameter file if [ ! -s "${cfg.certificateDirectory}/dh.pem" ] then mkdir -p "${cfg.certificateDirectory}" ${pkgs.openssl}/bin/openssl \ dhparam ${builtins.toString cfg.dhParamBitLength} \ > "${cfg.certificateDirectory}/dh.pem" fi ''; createDomainDkimCert = dom: let dkim_key = "${cfg.dkimKeyDirectory}/${dom}.${cfg.dkimSelector}.key"; dkim_txt = "${cfg.dkimKeyDirectory}/${dom}.${cfg.dkimSelector}.txt"; in '' if [ ! -f "${dkim_key}" ] || [ ! -f "${dkim_txt}" ] then ${pkgs.opendkim}/bin/opendkim-genkey -s "${cfg.dkimSelector}" \ -d "${dom}" \ --directory="${cfg.dkimKeyDirectory}" mv "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.private" "${dkim_key}" mv "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.txt" "${dkim_txt}" fi ''; createAllCerts = lib.concatStringsSep "\n" (map createDomainDkimCert cfg.domains); create_dkim_cert = '' # Create dkim dir mkdir -p "${cfg.dkimKeyDirectory}" chown rmilter:rmilter "${cfg.dkimKeyDirectory}" ${createAllCerts} chown -R rmilter:rmilter "${cfg.dkimKeyDirectory}" ''; in { config = with cfg; lib.mkIf enable { # Make sure postfix gets started first, so that the certificates are in place systemd.services.dovecot2.after = [ "postfix.service" ]; # Create certificates and maildir folder systemd.services.postfix = { after = (if (certificateScheme == 3) then [ "nginx.service" ] else []); preStart = '' # Create mail directory and set permissions. See # . mkdir -p "${mailDirectory}" chgrp "${vmailGroupName}" "${mailDirectory}" chmod 02770 "${mailDirectory}" ${create_certificate} ${let dovecotVersion = builtins.fromJSON (builtins.readFile (pkgs.callPackage ./dovecot-version.nix {})); in lib.optionalString (dovecotVersion.major == 2 && dovecotVersion.minor >= 3) createDhParameterFile} ''; }; # Create dkim certificates systemd.services.rmilter = { requires = [ "rmilter.socket" ]; after = [ "rmilter.socket" ]; preStart = '' ${create_dkim_cert} ''; }; }; } ================================================ FILE: mail-server/users.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see { config, pkgs, lib, ... }: with config.mailserver; let vmail_user = { name = vmailUserName; isNormalUser = false; uid = vmailUID; home = mailDirectory; createHome = true; group = vmailGroupName; }; virtualMailUsersActivationScript = pkgs.writeScript "activate-virtual-mail-users" '' #!${pkgs.stdenv.shell} set -euo pipefail # Create directory to store user sieve scripts if it doesn't exist if (! test -d "/var/sieve"); then mkdir "/var/sieve" chown "${vmailUserName}:${vmailGroupName}" "/var/sieve" chmod 770 "/var/sieve" fi # Copy user's sieve script to the correct location (if it exists). If it # is null, remove the file. ${lib.concatMapStringsSep "\n" ({ name, sieveScript }: if lib.isString sieveScript then '' if (! test -d "/var/sieve/${name}"); then mkdir -p "/var/sieve/${name}" chown "${vmailUserName}:${vmailGroupName}" "/var/sieve/${name}" chmod 770 "/var/sieve/${name}" fi cat << 'EOF' > "/var/sieve/${name}/default.sieve" ${sieveScript} EOF chown "${vmailUserName}:${vmailGroupName}" "/var/sieve/${name}/default.sieve" '' else '' if (test -f "/var/sieve/${name}/default.sieve"); then rm "/var/sieve/${name}/default.sieve" fi if (test -f "/var/sieve/${name}.svbin"); then rm "/var/sieve/${name}/default.svbin" fi '') (map (user: { inherit (user) name sieveScript; }) (lib.attrValues loginAccounts))} ''; in { config = lib.mkIf enable { # set the vmail gid to a specific value users.groups = { "${vmailGroupName}" = { gid = vmailUID; }; }; # define all users users.users = { "${vmail_user.name}" = lib.mkForce vmail_user; }; systemd.services.activate-virtual-mail-users = { wantedBy = [ "multi-user.target" ]; before = [ "dovecot2.service" ]; serviceConfig = { ExecStart = virtualMailUsersActivationScript; }; enable = true; }; }; } ================================================ FILE: nixops/single-server.nix ================================================ { network.description = "mail server"; mailserver = { config, pkgs, ... }: { imports = [ ./../default.nix ]; mailserver = { enable = true; fqdn = "mail.example.com"; domains = [ "example.com" "example2.com" ]; loginAccounts = { "user1@example.com" = { hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/"; }; }; virtualAliases = { "info@example.com" = "user1@example.com"; "postmaster@example.com" = "user1@example.com"; "abuse@example.com" = "user1@example.com"; "user1@example2.com" = "user1@example.com"; "info@example2.com" = "user1@example.com"; "postmaster@example2.com" = "user1@example.com"; "abuse@example2.com" = "user1@example.com"; }; }; }; } ================================================ FILE: nixops/vbox.nix ================================================ { mailserver = { config, pkgs, ... }: { deployment.targetEnv = "virtualbox"; deployment.virtualbox.memorySize = 1024; # megabytes deployment.virtualbox.vcpu = 2; # number of cpus deployment.virtualbox.headless = true; }; } ================================================ FILE: tests/extern.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see import { nodes = { server = { config, pkgs, ... }: { imports = [ ../default.nix ]; mailserver = { enable = true; debug = true; fqdn = "mail.example.com"; domains = [ "example.com" "example2.com" ]; dhParamBitLength = 512; rewriteMessageId = true; loginAccounts = { "user1@example.com" = { hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/"; aliases = [ "postmaster@example.com" ]; catchAll = [ "example.com" ]; }; "user2@example.com" = { hashedPassword = "$6$u61JrAtuI0a$nGEEfTP5.eefxoScUGVG/Tl0alqla2aGax4oTd85v3j3xSmhv/02gNfSemv/aaMinlv9j/ZABosVKBrRvN5Qv0"; aliases = [ "chuck@example.com" ]; }; "user@example2.com" = { hashedPassword = "$6$u61JrAtuI0a$nGEEfTP5.eefxoScUGVG/Tl0alqla2aGax4oTd85v3j3xSmhv/02gNfSemv/aaMinlv9j/ZABosVKBrRvN5Qv0"; }; "lowquota@example.com" = { hashedPassword = "$6$u61JrAtuI0a$nGEEfTP5.eefxoScUGVG/Tl0alqla2aGax4oTd85v3j3xSmhv/02gNfSemv/aaMinlv9j/ZABosVKBrRvN5Qv0"; quota = "1B"; }; }; extraVirtualAliases = { "single-alias@example.com" = "user1@example.com"; "multi-alias@example.com" = [ "user1@example.com" "user2@example.com" ]; }; enableImap = true; }; }; client = { nodes, config, pkgs, ... }: let serverIP = nodes.server.config.networking.primaryIPAddress; clientIP = nodes.client.config.networking.primaryIPAddress; grep-ip = pkgs.writeScriptBin "grep-ip" '' #!${pkgs.stdenv.shell} echo grep '${clientIP}' "$@" >&2 exec grep '${clientIP}' "$@" ''; check-mail-id = pkgs.writeScriptBin "check-mail-id" '' #!${pkgs.stdenv.shell} echo grep '^Message-ID:.*@mail.example.com>$' "$@" >&2 exec grep '^Message-ID:.*@mail.example.com>$' "$@" ''; in { environment.systemPackages = with pkgs; [ fetchmail msmtp procmail findutils grep-ip check-mail-id ]; environment.etc = { "root/.fetchmailrc" = { text = '' poll ${serverIP} with proto IMAP user 'user1@example.com' there with password 'user1' is 'root' here mda procmail ''; mode = "0700"; }; "root/.fetchmailRcLowQuota" = { text = '' poll ${serverIP} with proto IMAP user 'lowquota\@example.com' there with password 'user1' is 'root' here mda procmail ''; mode = "0700"; }; "root/.procmailrc" = { text = "DEFAULT=$HOME/mail"; }; "root/.msmtprc" = { text = '' account test host ${serverIP} port 587 from user2@example.com user user2@example.com password user2 account test2 host ${serverIP} port 587 from user@example2.com user user@example2.com password user2 account test3 host ${serverIP} port 587 from chuck@example.com user user2@example.com password user2 account test4 host ${serverIP} port 587 from postmaster@example.com user user1@example.com password user1 account test5 host ${serverIP} port 587 from single-alias@example.com user user1@example.com password user1 ''; }; "root/email1".text = '' Message-ID: <12345qwerty@host.local.network> From: User2 To: User1 Cc: Bcc: Subject: This is a test Email from user2 to user1 Reply-To: Hello User1, how are you doing today? ''; "root/email2".text = '' Message-ID: <232323abc@host.local.network> From: User To: User1 Cc: Bcc: Subject: This is a test Email from user@example2.com to user1 Reply-To: Hello User1, how are you doing today? XOXO User1 ''; "root/email3".text = '' Message-ID: From: Postmaster To: Chuck Cc: Bcc: Subject: This is a test Email from postmaster\@example.com to chuck Reply-To: Hello Chuck, I think I may have misconfigured the mail server XOXO Postmaster ''; "root/email4".text = '' Message-ID: From: Single Alias To: User1 Cc: Bcc: Subject: This is a test Email from single-alias\@example.com to user1 Reply-To: Hello User1, how are you doing today? XOXO User1 aka Single Alias ''; "root/email5".text = '' Message-ID: <789asdf@host.local.network> From: User2 To: Multi Alias Cc: Bcc: Subject: This is a test Email from user2\@example.com to multi-alias Reply-To: Hello Multi Alias, how are we doing today? XOXO User1 ''; }; }; }; testScript = '' startAll; $server->waitForUnit("multi-user.target"); $client->waitForUnit("multi-user.target"); $client->execute("cp -p /etc/root/.* ~/"); $client->succeed("mkdir ~/mail"); $client->succeed("ls -la ~/ >&2"); $client->succeed("cat ~/.fetchmailrc >&2"); $client->succeed("cat ~/.procmailrc >&2"); $client->succeed("cat ~/.msmtprc >&2"); subtest "imap retrieving mail", sub { # fetchmail returns EXIT_CODE 1 when no new mail $client->succeed("fetchmail -v || [ \$? -eq 1 ] >&2"); }; subtest "submission port send mail", sub { # send email from user2 to user1 $client->succeed("msmtp -a test --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email1 >&2"); # give the mail server some time to process the mail $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); }; subtest "imap retrieving mail 2", sub { $client->execute("rm ~/mail/*"); # fetchmail returns EXIT_CODE 0 when it retrieves mail $client->succeed("fetchmail -v >&2"); }; subtest "remove sensitive information on submission port", sub { $client->succeed("cat ~/mail/* >&2"); ## make sure our IP is _not_ in the email header $client->fail("grep-ip ~/mail/*"); $client->succeed("check-mail-id ~/mail/*"); }; subtest "have correct fqdn as sender", sub { $client->succeed("grep 'Received: from mail.example.com' ~/mail/*"); }; subtest "dkim singing, multiple domains", sub { $client->execute("rm ~/mail/*"); # send email from user2 to user1 $client->succeed("msmtp -a test2 --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email2 >&2"); $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); # fetchmail returns EXIT_CODE 0 when it retrieves mail $client->succeed("fetchmail -v"); $client->succeed("cat ~/mail/* >&2"); # make sure it is dkim signed $client->succeed("grep DKIM ~/mail/*"); }; subtest "aliases", sub { $client->execute("rm ~/mail/*"); # send email from chuck to postmaster $client->succeed("msmtp -a test3 --tls=on --tls-certcheck=off --auth=on postmaster\@example.com < /etc/root/email2 >&2"); $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); # fetchmail returns EXIT_CODE 0 when it retrieves mail $client->succeed("fetchmail -v"); }; subtest "catchAlls", sub { $client->execute("rm ~/mail/*"); # send email from chuck to non exsitent account $client->succeed("msmtp -a test3 --tls=on --tls-certcheck=off --auth=on lol\@example.com < /etc/root/email2 >&2"); $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); # fetchmail returns EXIT_CODE 0 when it retrieves mail $client->succeed("fetchmail -v"); $client->execute("rm ~/mail/*"); # send email from user1 to chuck $client->succeed("msmtp -a test4 --tls=on --tls-certcheck=off --auth=on chuck\@example.com < /etc/root/email2 >&2"); $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); # fetchmail returns EXIT_CODE 1 when no new mail # if this succeeds, it means that user1 recieved the mail that was intended for chuck. $client->fail("fetchmail -v"); }; subtest "extraVirtualAliases", sub { $client->execute("rm ~/mail/*"); # send email from single-alias to user1 $client->succeed("msmtp -a test5 --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email4 >&2"); $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); # fetchmail returns EXIT_CODE 0 when it retrieves mail $client->succeed("fetchmail -v"); $client->execute("rm ~/mail/*"); # send email from user1 to multi-alias (user{1,2}@example.com) $client->succeed("msmtp -a test --tls=on --tls-certcheck=off --auth=on multi-alias\@example.com < /etc/root/email5 >&2"); $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); # fetchmail returns EXIT_CODE 0 when it retrieves mail $client->succeed("fetchmail -v"); }; subtest "quota", sub { $client->execute("rm ~/mail/*"); $client->execute("mv ~/.fetchmailRcLowQuota ~/.fetchmailrc"); $client->succeed("msmtp -a test3 --tls=on --tls-certcheck=off --auth=on lowquota\@example.com < /etc/root/email2 >&2"); $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]'); # fetchmail returns EXIT_CODE 0 when it retrieves mail $client->fail("fetchmail -v"); }; subtest "no warnings or errors", sub { $server->fail("journalctl -u postfix | grep -i error >&2"); $server->fail("journalctl -u postfix | grep -i warning >&2"); $server->fail("journalctl -u dovecot2 | grep -i error >&2"); $server->fail("journalctl -u dovecot2 | grep -i warning >&2"); }; ''; } ================================================ FILE: tests/intern.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see import { machine = { config, pkgs, ... }: { imports = [ ./../default.nix ]; mailserver = { enable = true; fqdn = "mail.example.com"; domains = [ "example.com" ]; dhParamBitLength = 512; loginAccounts = { "user1@example.com" = { hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/"; }; }; vmailGroupName = "vmail"; vmailUID = 5000; }; }; testScript = '' $machine->start; $machine->waitForUnit("multi-user.target"); subtest "vmail gid is set correctly", sub { $machine->succeed("getent group vmail | grep 5000"); }; ''; } ================================================ FILE: tests/minimal.nix ================================================ # nixos-mailserver: a simple mail server # Copyright (C) 2016-2018 Robin Raymond # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see import ./../../nixpkgs/nixos/tests/make-test.nix { machine = { config, pkgs, ... }: { imports = [ ./../default.nix ]; }; testScript = '' $machine->waitForUnit("multi-user.target"); ''; } ================================================ FILE: update.sh ================================================ #!/usr/bin/env bash sed -i -e "s/v[0-9]\+\.[0-9]\+\.[0-9]\+/$1/g" README.md