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
|
# SPDX-License-Identifier: GPL-2.0-or-later and CC0-1.0
# Copyright (c) 2004-2023 University of Cambridge
# Copyright (C) 2023 Wojtek Kosior <koszko@koszko.org>
# Changes by Wojtek are available under CC0.
# Adapted from
# https://git.exim.org/exim.git/blob/3e6d406e8ae9681a8cc1b404e7f5d1bd6d65d201:/src/src/configure.default
spool_directory = /var/spool/exim
log_file_path = $spool_directory/log/%slog
log_selector = +smtp_protocol_error +smtp_syntax_error \
+tls_certificate_verified +tls_peerdn
domainlist local_domains = @:localhost:koszko.org:koszkonutek-tmp.pl.eu.org:happyhacking.pl
domainlist relay_to_domains =
hostlist relay_from_hosts = : 127.0.0.1 : ::::1
acl_smtp_rcpt = acl_check_rcpt
.ifdef _HAVE_PRDR
# currently does nothing
acl_smtp_data_prdr = acl_check_prdr
.endif
acl_smtp_data = acl_check_data
tls_certificate = /etc/cert-links/guixbot_koszko.org/fullchain.pem
tls_privatekey = /etc/cert-links/guixbot_koszko.org/privkey.pem
tls_verify_certificates = ${if exists{/etc/ssl/certs/ca-certificates.crt}\
{/etc/ssl/certs/ca-certificates.crt}\
{/dev/null}}
.ifdef _HAVE_GNUTLS
tls_dhparam = historic
.endif
# For OpenSSL, prefer EC- over RSA-authenticated ciphers
.ifdef _HAVE_OPENSSL
tls_require_ciphers = ECDSA:RSA:!COMPLEMENTOFDEFAULT
.endif
daemon_smtp_ports = 25 : 12525 : 465 : 587
tls_on_connect_ports = 465 : 587
primary_hostname = koszko.org
qualify_domain = koszko.org
never_users = root
host_lookup = *
dns_dnssec_ok = 1
#rfc1413_hosts = *
#rfc1413_query_timeout = 5s
.ifdef _HAVE_PRDR
prdr_enable = true
.endif
ignore_bounce_errors_after = 2d
timeout_frozen_after = 7d
freeze_tell = admin
check_rfc2047_length = false
accept_8bitmime = false
keep_environment =
begin acl
acl_check_rcpt:
accept hosts = :
control = dkim_disable_verify
deny message = Restricted characters in address
domains = +local_domains
local_parts = ^[.] : ^.*[@%!/|`#&?]
deny message = Restricted characters in address
domains = !+local_domains
local_parts = ^[./|] : ^.*[@%!`#&?] : ^.*/\\.\\./
accept local_parts = postmaster
domains = +local_domains
require verify = sender
deny condition = ${if and {\
{>{$rcpt_count}{10}}\
{<{$recipients_count}{${eval:$rcpt_count/2}}} }}
message = Rejected for too many bad recipients
logwrite = REJECT [$sender_host_address]: bad recipient count high [${eval:$rcpt_count-$recipients_count}]
accept hosts = +relay_from_hosts
control = submission/sender_retain
control = dkim_disable_verify
accept authenticated = *
# TODO: only use this for email sent by the admin
control = submission/sender_retain
control = dkim_disable_verify
require message = relay not permitted
domains = +local_domains : +relay_to_domains
require verify = recipient
accept
.ifdef _HAVE_PRDR
acl_check_prdr:
warn set acl_m_did_prdr = y
accept
.endif
acl_check_data:
deny condition = ${if > {$max_received_linelength}{998}}
message = maximum allowed line length is 998 octets, \
got $max_received_linelength
deny !verify = header_syntax
message = header syntax
log_message = header syntax ($acl_verify_message)
accept
begin routers
dnslookup:
driver = dnslookup
domains = ! +local_domains
transport = remote_smtp
same_domain_copy_routing = yes
ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; 192.168.0.0/16 ;\
172.16.0.0/12 ; 10.0.0.0/8 ; 169.254.0.0/16 ;\
255.255.255.255 ; ::1
dnssec_request_domains = *
no_more
system_aliases:
driver = redirect
allow_fail
allow_defer
data = ${lookup{$local_part}lsearch{/etc/aliases}}
userforward:
driver = redirect
check_local_user
# local_part_suffix = +* : -*
# local_part_suffix_optional
file = $home/.forward
# allow_filter
no_verify
no_expn
check_ancestor
file_transport = address_file
pipe_transport = address_pipe
reply_transport = address_reply
localuser:
driver = accept
check_local_user
transport = local_delivery
cannot_route_message = Unknown user
begin transports
remote_smtp:
driver = smtp
dkim_domain = koszko.org
dkim_selector = mail
dkim_private_key = /etc/exim/dkim.pem
.ifdef _HAVE_DANE
dnssec_request_domains = *
hosts_try_dane = *
.endif
local_delivery:
driver = appendfile
directory = $home/Maildir
create_directory
delivery_date_add
envelope_to_add
return_path_add
maildir_format
directory_mode = 0700
mode = 0600
mode_fail_narrower = false
address_pipe:
driver = pipe
return_fail_output
address_file:
driver = appendfile
delivery_date_add
envelope_to_add
return_path_add
address_reply:
driver = autoreply
begin retry
# Address or Domain Error Retries
# ----------------- ----- -------
* * F,2h,15m; G,16h,1h,1.5; F,4d,6h
begin rewrite
begin authenticators
# PLAIN authentication has no server prompts. The client sends its
# credentials in one lump, containing an authorization ID (which we do not
# use), an authentication ID, and a password. The latter two appear as
# $auth2 and $auth3 in the configuration and should be checked against a
# valid username and password. In a real configuration you would typically
# use $auth2 as a lookup key, and compare $auth3 against the result of the
# lookup, perhaps using the crypteq{}{} condition.
PLAIN:
driver = plaintext
server_set_id = $auth2
server_prompts = :
server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{/etc/exim/passwd}{$value}{*:*}}}}}{1}{0}}"
server_advertise_condition = ${if def:tls_in_cipher }
# LOGIN authentication has traditional prompts and responses. There is no
# authorization ID in this mechanism, so unlike PLAIN the username and
# password are $auth1 and $auth2. Apart from that you can use the same
# server_condition setting for both authenticators.
LOGIN:
driver = plaintext
server_set_id = $auth1
server_prompts = <| Username: | Password:
server_condition = "${if crypteq{$auth2}{${extract{1}{:}{${lookup{$auth1}lsearch{/etc/exim/passwd}{$value}{*:*}}}}}{1}{0}}"
server_advertise_condition = ${if def:tls_in_cipher }
# Hehe
HAPPY_HACKING:
driver = plaintext
server_set_id = $auth1
server_prompts = <| Login hackera: \
| Hasło hackera: \
| Ulubiony kolor: \
| Imię pierwszego zwierzątka domowego: \
| Panieńskie nazwisko Babci od strony Mamy:
server_condition = 0
server_advertise_condition = 1
|
