aboutsummaryrefslogtreecommitdiff
path: root/modules/private/mail/dovecot.nix
blob: 0304b899cb724f7b02e483d3918b8ab9f8ad4087 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
{ lib, pkgs, config, ... }:
let
  sieve_bin = pkgs.runCommand "sieve_bin" {
    buildInputs = [ pkgs.makeWrapper ];
  } ''
    cp -a ${./sieve_bin} $out
    chmod -R u+w $out
    patchShebangs $out
    for i in $out/*; do
      wrapProgram "$i" --prefix PATH : ${lib.makeBinPath [ pkgs.coreutils ]}
    done
    '';
in
{
  config = lib.mkIf config.myServices.mail.enable {
    services.duplyBackup.profiles.mail.excludeFile = ''
      + /var/lib/dhparams
      + /var/lib/dovecot
      '';
    secrets.keys = [
      {
        dest = "dovecot/ldap";
        user = config.services.dovecot2.user;
        group = config.services.dovecot2.group;
        permissions = "0400";
        text = ''
          hosts = ${config.myEnv.mail.dovecot.ldap.host}
          tls = yes

          dn = ${config.myEnv.mail.dovecot.ldap.dn}
          dnpass = ${config.myEnv.mail.dovecot.ldap.password}

          auth_bind = yes

          ldap_version = 3

          base = ${config.myEnv.mail.dovecot.ldap.base}
          scope = subtree

          pass_filter = ${config.myEnv.mail.dovecot.ldap.filter}
          pass_attrs = ${config.myEnv.mail.dovecot.ldap.pass_attrs}

          user_attrs = ${config.myEnv.mail.dovecot.ldap.user_attrs}
          user_filter = ${config.myEnv.mail.dovecot.ldap.filter}
          iterate_attrs = ${config.myEnv.mail.dovecot.ldap.iterate_attrs}
          iterate_filter = ${config.myEnv.mail.dovecot.ldap.iterate_filter}
          '';
      }
    ];

    users.users.vhost = {
      group = "vhost";
      uid = config.ids.uids.vhost;
    };
    users.groups.vhost.gid = config.ids.gids.vhost;

    # https://blog.zeninc.net/index.php?post/2018/04/01/Un-annuaire-pour-les-gouverner-tous.......
    services.dovecot2 = {
      enable = true;
      enablePAM = false;
      enablePop3 = true;
      enableImap = true;
      enableLmtp = true;
      protocols = [ "sieve" ];
      modules = [
        pkgs.dovecot_pigeonhole
        pkgs.dovecot_fts-xapian
      ];
      mailUser = "vhost";
      mailGroup = "vhost";
      createMailUser = false;
      mailboxes = [
        { name = "Trash";  auto = "subscribe"; specialUse = "Trash"; }
        { name = "Junk";   auto = "subscribe"; specialUse = "Junk"; }
        { name = "Sent";   auto = "subscribe"; specialUse = "Sent"; }
        { name = "Drafts"; auto = "subscribe"; specialUse = "Drafts"; }
      ];
      mailLocation = "mbox:~/Mail:INBOX=~/Mail/Inbox:INDEX=~/.imap";
      sslServerCert = "/var/lib/acme/mail/fullchain.pem";
      sslServerKey = "/var/lib/acme/mail/key.pem";
      sslCACert = "/var/lib/acme/mail/fullchain.pem";
      extraConfig = builtins.concatStringsSep "\n" [
        # For printer which doesn’t support elliptic curve
        ''
          ssl_alt_cert = </var/lib/acme/mail-rsa/fullchain.pem
          ssl_alt_key = </var/lib/acme/mail-rsa/key.pem
        ''

        ''
          postmaster_address = postmaster@immae.eu
          mail_attribute_dict = file:%h/dovecot-attributes
          imap_idle_notify_interval = 20 mins
          namespace inbox {
            type = private
            separator = /
            inbox = yes
            list = yes
          }
        ''

        # ACL
        ''
          mail_plugins = $mail_plugins acl
          plugin {
            acl = vfile:${pkgs.writeText "dovecot-acl" ''
              Backup/* owner lrp
              ''}
            acl_globals_only = yes
          }
        ''

        # Full text search
        ''
          # needs to be bigger than any mailbox size
          default_vsz_limit = 2GB
          mail_plugins = $mail_plugins fts fts_xapian
          plugin {
            plugin = fts fts_xapian
            fts = xapian
            fts_xapian = partial=2 full=20
            fts_autoindex = yes
            fts_autoindex_exclude = \Junk
            fts_autoindex_exclude2 = \Trash
            fts_autoindex_exclude3 = Virtual/*
          }
        ''

        # Antispam
        # https://docs.iredmail.org/dovecot.imapsieve.html
        ''
        # imap_sieve plugin added below

        plugin {
            sieve_plugins = sieve_imapsieve sieve_extprograms
            imapsieve_url = sieve://127.0.0.1:4190

            sieve_before = file:${./sieve_scripts}/backup.sieve;bindir=/var/lib/vhost/.sieve_bin

            # From elsewhere to Junk folder
            imapsieve_mailbox1_name = Junk
            imapsieve_mailbox1_causes = COPY APPEND
            imapsieve_mailbox1_before = file:${./sieve_scripts}/report_spam.sieve;bindir=/var/lib/vhost/.imapsieve_bin

            # From Junk folder to elsewhere
            imapsieve_mailbox2_name = *
            imapsieve_mailbox2_from = Junk
            imapsieve_mailbox2_causes = COPY
            imapsieve_mailbox2_before = file:${./sieve_scripts}/report_ham.sieve;bindir=/var/lib/vhost/.imapsieve_bin

            # From anywhere to NoJunk folder
            imapsieve_mailbox3_name = NoJunk
            imapsieve_mailbox3_causes = COPY APPEND
            imapsieve_mailbox3_before = file:${./sieve_scripts}/report_ham.sieve;bindir=/var/lib/vhost/.imapsieve_bin

            sieve_pipe_bin_dir = ${sieve_bin}

            sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment
        }
        ''
        # Services to listen
        ''
        service imap-login {
          inet_listener imap {
          }
          inet_listener imaps {
          }
        }
        service pop3-login {
          inet_listener pop3 {
          }
          inet_listener pop3s {
          }
        }
        service imap {
        }
        service pop3 {
        }
        service auth {
          unix_listener auth-userdb {
          }
          unix_listener ${config.services.postfix.config.queue_directory}/private/auth {
            mode = 0666
          }
        }
        service auth-worker {
        }
        service dict {
          unix_listener dict {
          }
        }
        service stats {
          unix_listener stats-reader {
            user = vhost
            group = vhost
            mode = 0660
          }
          unix_listener stats-writer {
            user = vhost
            group = vhost
            mode = 0660
          }
        }
        ''

        # Authentification
        ''
        first_valid_uid = ${toString config.ids.uids.vhost}
        disable_plaintext_auth = yes
        passdb {
          driver = ldap
          args = ${config.secrets.fullPaths."dovecot/ldap"}
        }
        userdb {
          driver = ldap
          args = ${config.secrets.fullPaths."dovecot/ldap"}
        }
        ''

        # Zlib
        ''
        mail_plugins = $mail_plugins zlib
        plugin {
          zlib_save_level = 6
          zlib_save = gz
        }
        ''

        # Sieve
        ''
        plugin {
          sieve = file:~/sieve;bindir=~/.sieve-bin;active=~/.dovecot.sieve
        }
        service managesieve-login {
        }
        service managesieve {
        }
        ''

        # Virtual mailboxes
        ''
        mail_plugins = $mail_plugins virtual
        namespace Virtual {
          prefix = Virtual/
          location = virtual:~/Virtual
        }
        ''

        # Protocol specific configuration
        # Needs to come last if there are mail_plugins entries
        ''
        protocol imap {
          mail_plugins = $mail_plugins imap_sieve imap_acl
        }
        protocol lda {
          mail_plugins = $mail_plugins sieve
        }
        ''
      ];
    };
    networking.firewall.allowedTCPPorts = [ 110 143 993 995 4190 ];
    system.activationScripts.dovecot = {
      deps = [ "users" ];
      text  =''
        install -m 0755 -o vhost -g vhost -d /var/lib/vhost
        '';
    };

    services.cron.systemCronJobs = let
      cron_script = pkgs.writeScriptBin "cleanup-imap-folders" ''
        ${pkgs.dovecot}/bin/doveadm expunge -A MAILBOX "Backup/*" NOT FLAGGED BEFORE 8w 2>&1 > /dev/null | grep -v "Mailbox doesn't exist:" | grep -v "Info: Opening DB"
        ${pkgs.dovecot}/bin/doveadm expunge -A MAILBOX Junk SEEN NOT FLAGGED BEFORE 4w 2>&1 > /dev/null | grep -v "Mailbox doesn't exist:" | grep -v "Info: Opening DB"
        ${pkgs.dovecot}/bin/doveadm expunge -A MAILBOX Trash NOT FLAGGED BEFORE 4w 2>&1 > /dev/null | grep -v "Mailbox doesn't exist:" | grep -v "Info: Opening DB"
        '';
      in
      [
        "0 2 * * * root ${cron_script}/bin/cleanup-imap-folders"
      ];
    security.acme.certs."mail-rsa" = {
      postRun = ''
        systemctl restart dovecot2.service
      '';
      extraDomains = {
        "imap.immae.eu" = null;
        "pop3.immae.eu" = null;
      };
    };
    security.acme.certs."mail" = {
      postRun = ''
        systemctl restart dovecot2.service
      '';
      extraDomains = {
        "imap.immae.eu" = null;
        "pop3.immae.eu" = null;
      };
    };
  };
}