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
|
{ lib, pkgs, config, myconfig, ... }:
{
config = lib.mkIf config.myServices.mail.enable {
services.duplyBackup.profiles.mail.excludeFile = ''
+ /var/lib/postfix
'';
secrets.keys = [
{
dest = "postfix/mysql_alias_maps";
user = config.services.postfix.user;
group = config.services.postfix.group;
permissions = "0440";
text = ''
# We need to specify that option to trigger ssl connection
tls_ciphers = TLSv1.2
user = ${myconfig.env.mail.postfix.mysql.user}
password = ${myconfig.env.mail.postfix.mysql.password}
hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
dbname = ${myconfig.env.mail.postfix.mysql.database}
query = SELECT DISTINCT destination
FROM forwardings_merge
WHERE
((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
AND active = 1
AND '%s' NOT IN
(
SELECT source
FROM forwardings_blacklisted
WHERE source = '%s'
) UNION
SELECT 'devnull@immae.eu'
FROM forwardings_blacklisted
WHERE source = '%s'
'';
}
{
dest = "postfix/mysql_mailbox_maps";
user = config.services.postfix.user;
group = config.services.postfix.group;
permissions = "0440";
text = ''
# We need to specify that option to trigger ssl connection
tls_ciphers = TLSv1.2
user = ${myconfig.env.mail.postfix.mysql.user}
password = ${myconfig.env.mail.postfix.mysql.password}
hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
dbname = ${myconfig.env.mail.postfix.mysql.database}
result_format = /%d/%u
query = SELECT DISTINCT '%s'
FROM mailboxes
WHERE active = 1
AND (
(domain = '%d' AND user = '%u' AND regex = 0)
OR (
regex = 1
AND '%d' REGEXP CONCAT('^',domain,'$')
AND '%u' REGEXP CONCAT('^',user,'$')
)
)
LIMIT 1
'';
}
{
dest = "postfix/mysql_sender_login_maps";
user = config.services.postfix.user;
group = config.services.postfix.group;
permissions = "0440";
text = ''
# We need to specify that option to trigger ssl connection
tls_ciphers = TLSv1.2
user = ${myconfig.env.mail.postfix.mysql.user}
password = ${myconfig.env.mail.postfix.mysql.password}
hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
dbname = ${myconfig.env.mail.postfix.mysql.database}
query = SELECT DISTINCT destination
FROM forwardings_merge
WHERE
((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
AND active = 1
UNION SELECT '%s' AS destination
'';
}
];
networking.firewall.allowedTCPPorts = [ 25 465 587 ];
nixpkgs.overlays = [ (self: super: {
postfix = super.postfix.override { withMySQL = true; };
}) ];
users.users."${config.services.postfix.user}".extraGroups = [ "keys" ];
services.filesWatcher.postfix = {
restart = true;
paths = [
config.secrets.fullPaths."postfix/mysql_alias_maps"
config.secrets.fullPaths."postfix/mysql_mailbox_maps"
config.secrets.fullPaths."postfix/mysql_sender_login_maps"
];
};
services.postfix = {
mapFiles = let
recipient_maps = let
name = n: i: "relay_${n}_${toString i}";
pair = n: i: m: lib.attrsets.nameValuePair (name n i) (
if m.type == "hash"
then pkgs.writeText (name n i) m.content
else null
);
pairs = n: v: lib.imap1 (i: m: pair n i m) v.recipient_maps;
in lib.attrsets.filterAttrs (k: v: v != null) (
lib.attrsets.listToAttrs (lib.flatten (
lib.attrsets.mapAttrsToList pairs myconfig.env.mail.postfix.backup_domains
))
);
relay_restrictions = lib.attrsets.filterAttrs (k: v: v != null) (
lib.attrsets.mapAttrs' (n: v:
lib.attrsets.nameValuePair "recipient_access_${n}" (
if lib.attrsets.hasAttr "relay_restrictions" v
then pkgs.writeText "recipient_access_${n}" v.relay_restrictions
else null
)
) myconfig.env.mail.postfix.backup_domains
);
in
recipient_maps // relay_restrictions;
config = {
### postfix module overrides
readme_directory = "${pkgs.postfix}/share/postfix/doc";
smtp_tls_CAfile = lib.mkForce "";
smtp_tls_cert_file = lib.mkForce "";
smtp_tls_key_file = lib.mkForce "";
message_size_limit = "1073741824"; # Don't put 0 here, it's not equivalent to "unlimited"
alias_database = "\$alias_maps";
### Virtual mailboxes config
virtual_alias_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_alias_maps"}";
virtual_mailbox_domains = myconfig.env.mail.postfix.additional_mailbox_domains
++ lib.remove "localhost.immae.eu" (lib.remove null (lib.flatten (map
(zone: map
(e: if e.receive
then "${e.domain}${lib.optionalString (e.domain != "") "."}${zone.name}"
else null
)
(zone.withEmail or [])
)
myconfig.env.dns.masterZones
)));
virtual_mailbox_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_mailbox_maps"}";
dovecot_destination_recipient_limit = "1";
virtual_transport = "dovecot";
### Relay domains
relay_domains = lib.flatten (lib.attrsets.mapAttrsToList (n: v: v.domains or []) myconfig.env.mail.postfix.backup_domains);
relay_recipient_maps = lib.flatten (lib.attrsets.mapAttrsToList (n: v:
lib.imap1 (i: m: "${m.type}:/etc/postfix/relay_${n}_${toString i}") v.recipient_maps
) myconfig.env.mail.postfix.backup_domains);
smtpd_relay_restrictions = [
"permit_mynetworks"
"permit_sasl_authenticated"
"defer_unauth_destination"
] ++ lib.flatten (lib.attrsets.mapAttrsToList (n: v:
if lib.attrsets.hasAttr "relay_restrictions" v
then [ "check_recipient_access hash:/etc/postfix/recipient_access_${n}" ]
else []
) myconfig.env.mail.postfix.backup_domains);
### Additional smtpd configuration
smtpd_tls_received_header = "yes";
smtpd_tls_loglevel = "1";
### Email sending configuration
smtp_tls_security_level = "may";
smtp_tls_loglevel = "1";
### Force ip bind for smtp
smtp_bind_address = myconfig.env.servers.eldiron.ips.main.ip4;
smtp_bind_address6 = builtins.head myconfig.env.servers.eldiron.ips.main.ip6;
# #Unneeded if postfix can only send e-mail from "self" domains
# #smtp_sasl_auth_enable = "yes";
# #smtp_sasl_password_maps = "hash:/etc/postfix/relay_creds";
# #smtp_sasl_security_options = "noanonymous";
# #smtp_sender_dependent_authentication = "yes";
# #sender_dependent_relayhost_maps = "hash:/etc/postfix/sender_relay";
### opendkim, opendmarc, openarc milters
non_smtpd_milters = [
"unix:${config.myServices.mail.milters.sockets.opendkim}"
"unix:${config.myServices.mail.milters.sockets.opendmarc}"
"unix:${config.myServices.mail.milters.sockets.openarc}"
];
smtpd_milters = [
"unix:${config.myServices.mail.milters.sockets.opendkim}"
"unix:${config.myServices.mail.milters.sockets.opendmarc}"
"unix:${config.myServices.mail.milters.sockets.openarc}"
];
};
enable = true;
enableSmtp = true;
enableSubmission = true;
submissionOptions = {
smtpd_tls_security_level = "encrypt";
smtpd_sasl_auth_enable = "yes";
smtpd_tls_auth_only = "yes";
smtpd_sasl_tls_security_options = "noanonymous";
smtpd_sasl_type = "dovecot";
smtpd_sasl_path = "private/auth";
smtpd_reject_unlisted_recipient = "no";
smtpd_client_restrictions = "permit_sasl_authenticated,reject";
# Refuse to send e-mails with a From that is not handled
smtpd_sender_restrictions =
"reject_sender_login_mismatch,reject_unlisted_sender,permit_sasl_authenticated,reject";
smtpd_sender_login_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_sender_login_maps"}";
smtpd_recipient_restrictions = "permit_sasl_authenticated,reject";
milter_macro_daemon_name = "ORIGINATING";
smtpd_milters = "unix:${config.myServices.mail.milters.sockets.opendkim}";
};
# FIXME: Mail adressed to localhost.immae.eu will still have mx-1 as
# prioritized MX, which provokes "mail for localhost.immae.eu loops
# back to myself" errors. This transport entry forces to push
# e-mails to its right destination.
transport = ''
localhost.immae.eu smtp:[immae.eu]:25
'';
destination = ["localhost"];
# This needs to reverse DNS
hostname = "eldiron.immae.eu";
setSendmail = true;
sslCert = "/var/lib/acme/mail/fullchain.pem";
sslKey = "/var/lib/acme/mail/key.pem";
recipientDelimiter = "+";
masterConfig = {
submissions = {
type = "inet";
private = false;
command = "smtpd";
args = ["-o" "smtpd_tls_wrappermode=yes" ] ++ (let
mkKeyVal = opt: val: [ "-o" (opt + "=" + val) ];
in lib.concatLists (lib.mapAttrsToList mkKeyVal config.services.postfix.submissionOptions)
);
};
dovecot = {
type = "unix";
privileged = true;
chroot = false;
command = "pipe";
args = let
# rspamd could be used as a milter, but then it cannot apply
# its checks "per user" (milter is not yet dispatched to
# users), so we wrap dovecot-lda inside rspamc per recipient
# here.
dovecot_exe = "${pkgs.dovecot}/libexec/dovecot/dovecot-lda -f \${sender} -a \${original_recipient} -d \${user}@\${nexthop}";
in [
"flags=DRhu" "user=vhost:vhost"
"argv=${pkgs.rspamd}/bin/rspamc -h ${config.myServices.mail.rspamd.sockets.worker-controller} -c bayes -d \${user}@\${nexthop} --mime --exec {${dovecot_exe}}"
];
};
};
};
security.acme.certs."mail" = {
postRun = ''
systemctl restart postfix.service
'';
extraDomains = {
"smtp.immae.eu" = null;
};
};
};
}
|
