forked from angristan/openvpn-install
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathopenvpn-install.sh
executable file
·1219 lines (1114 loc) · 35.7 KB
/
openvpn-install.sh
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
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#!/bin/bash
# Secure OpenVPN server installer for Debian, Ubuntu, CentOS, Fedora and Arch Linux
# https://github.com/angristan/openvpn-install
function isRoot () {
if [ "$EUID" -ne 0 ]; then
return 1
fi
}
function tunAvailable () {
if [ ! -e /dev/net/tun ]; then
return 1
fi
}
function checkOS () {
if [[ -e /etc/debian_version ]]; then
OS="debian"
source /etc/os-release
if [[ "$ID" == "debian" ]]; then
if [[ ! $VERSION_ID =~ (8|9) ]]; then
echo "⚠️ Your version of Debian is not supported."
echo ""
echo "However, if you're using Debian >= 9 or unstable/testing then you can continue."
echo "Keep in mind they are not supported, though."
echo ""
until [[ $CONTINUE =~ (y|n) ]]; do
read -rp "Continue? [y/n]: " -e CONTINUE
done
if [[ "$CONTINUE" = "n" ]]; then
exit 1
fi
fi
elif [[ "$ID" == "ubuntu" ]];then
OS="ubuntu"
if [[ ! $VERSION_ID =~ (16.04|18.04) ]]; then
echo "⚠️ Your version of Ubuntu is not supported."
echo ""
echo "However, if you're using Ubuntu > 17 or beta, then you can continue."
echo "Keep in mind they are not supported, though."
echo ""
until [[ $CONTINUE =~ (y|n) ]]; do
read -rp "Continue? [y/n]: " -e CONTINUE
done
if [[ "$CONTINUE" = "n" ]]; then
exit 1
fi
fi
fi
elif [[ -e /etc/fedora-release ]]; then
OS=fedora
elif [[ -e /etc/centos-release ]]; then
if ! grep -qs "^CentOS Linux release 7" /etc/centos-release; then
echo "Your version of CentOS is not supported."
echo "The script only support CentOS 7."
echo ""
unset CONTINUE
until [[ $CONTINUE =~ (y|n) ]]; do
read -rp "Continue anyway? [y/n]: " -e CONTINUE
done
if [[ "$CONTINUE" = "n" ]]; then
echo "Ok, bye!"
exit 1
fi
fi
OS=centos
elif [[ -e /etc/arch-release ]]; then
OS=arch
else
echo "Looks like you aren't running this installer on a Debian, Ubuntu, Fedora, CentOS or Arch Linux system"
exit 1
fi
}
function initialCheck () {
if ! isRoot; then
echo "Sorry, you need to run this as root"
exit 1
fi
if ! tunAvailable; then
echo "TUN is not available"
exit 1
fi
checkOS
}
function installUnbound () {
if [[ ! -e /etc/unbound/unbound.conf ]]; then
if [[ "$OS" =~ (debian|ubuntu) ]]; then
apt-get install -y unbound
# Configuration
echo 'interface: 10.8.0.1
access-control: 10.8.0.1/24 allow
hide-identity: yes
hide-version: yes
use-caps-for-id: yes
prefetch: yes' >> /etc/unbound/unbound.conf
elif [[ "$OS" = "centos" ]]; then
yum install -y unbound
# Configuration
sed -i 's|# interface: 0.0.0.0$|interface: 10.8.0.1|' /etc/unbound/unbound.conf
sed -i 's|# access-control: 127.0.0.0/8 allow|access-control: 10.8.0.1/24 allow|' /etc/unbound/unbound.conf
sed -i 's|# hide-identity: no|hide-identity: yes|' /etc/unbound/unbound.conf
sed -i 's|# hide-version: no|hide-version: yes|' /etc/unbound/unbound.conf
sed -i 's|use-caps-for-id: no|use-caps-for-id: yes|' /etc/unbound/unbound.conf
elif [[ "$OS" = "fedora" ]]; then
dnf install -y unbound
# Configuration
sed -i 's|# interface: 0.0.0.0$|interface: 10.8.0.1|' /etc/unbound/unbound.conf
sed -i 's|# access-control: 127.0.0.0/8 allow|access-control: 10.8.0.1/24 allow|' /etc/unbound/unbound.conf
sed -i 's|# hide-identity: no|hide-identity: yes|' /etc/unbound/unbound.conf
sed -i 's|# hide-version: no|hide-version: yes|' /etc/unbound/unbound.conf
sed -i 's|# use-caps-for-id: no|use-caps-for-id: yes|' /etc/unbound/unbound.conf
elif [[ "$OS" = "arch" ]]; then
pacman -Syu --noconfirm unbound
# Get root servers list
curl -o /etc/unbound/root.hints https://www.internic.net/domain/named.cache
mv /etc/unbound/unbound.conf /etc/unbound/unbound.conf.old
echo 'server:
use-syslog: yes
do-daemonize: no
username: "unbound"
directory: "/etc/unbound"
trust-anchor-file: trusted-key.key
root-hints: root.hints
interface: 10.8.0.1
access-control: 10.8.0.1/24 allow
port: 53
num-threads: 2
use-caps-for-id: yes
harden-glue: yes
hide-identity: yes
hide-version: yes
qname-minimisation: yes
prefetch: yes' > /etc/unbound/unbound.conf
fi
if [[ ! "$OS" =~ (fedora|centos) ]];then
# DNS Rebinding fix
echo "private-address: 10.0.0.0/8
private-address: 172.16.0.0/12
private-address: 192.168.0.0/16
private-address: 169.254.0.0/16
private-address: fd00::/8
private-address: fe80::/10
private-address: 127.0.0.0/8
private-address: ::ffff:0:0/96" >> /etc/unbound/unbound.conf
fi
else # Unbound is already installed
echo 'include: /etc/unbound/openvpn.conf' >> /etc/unbound/unbound.conf
# Add Unbound 'server' for the OpenVPN subnet
echo 'server:
interface: 10.8.0.1
access-control: 10.8.0.1/24 allow
hide-identity: yes
hide-version: yes
use-caps-for-id: yes
prefetch: yes
private-address: 10.0.0.0/8
private-address: 172.16.0.0/12
private-address: 192.168.0.0/16
private-address: 169.254.0.0/16
private-address: fd00::/8
private-address: fe80::/10
private-address: 127.0.0.0/8
private-address: ::ffff:0:0/96' > /etc/unbound/openvpn.conf
fi
systemctl enable unbound
systemctl restart unbound
}
function installQuestions () {
echo "Welcome to the OpenVPN installer!"
echo "The git repository is available at: https://github.com/angristan/openvpn-install"
echo ""
echo "I need to ask you a few questions before starting the setup."
echo "You can leave the default options and just press enter if you are ok with them."
echo ""
echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
echo "Unless your server is behind NAT, it should be your public IPv4 address."
# Detect public IPv4 address and pre-fill for the user
IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
APPROVE_IP=${APPROVE_IP:-n}
if [[ $APPROVE_IP =~ n ]]; then
read -rp "IP address: " -e -i "$IP" IP
fi
# If $IP is a private IP address, the server must be behind NAT
if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
echo ""
echo "It seems this server is behind NAT. What is its public IPv4 address or hostname?"
echo "We need it for the clients to connect to the server."
until [[ "$ENDPOINT" != "" ]]; do
read -rp "Public IPv4 address or hostname: " -e ENDPOINT
done
fi
echo ""
echo "Checking for IPv6 connectivity..."
echo ""
# "ping6" and "ping -6" availability varies depending on the distribution
if type ping6 > /dev/null 2>&1; then
PING6="ping6 -c3 ipv6.google.com > /dev/null 2>&1"
else
PING6="ping -6 -c3 ipv6.google.com > /dev/null 2>&1"
fi
if eval "$PING6"; then
echo "Your host appears to have IPv6 connectivity."
SUGGESTION="y"
else
echo "Your host does not appear to have IPv6 connectivity."
SUGGESTION="n"
fi
echo ""
# Ask the user if they want to enable IPv6 regardless its availability.
until [[ $IPV6_SUPPORT =~ (y|n) ]]; do
read -rp "Do you want to enable IPv6 support (NAT)? [y/n]: " -e -i $SUGGESTION IPV6_SUPPORT
done
echo ""
echo "What port do you want OpenVPN to listen to?"
echo " 1) Default: 1194"
echo " 2) Custom"
echo " 3) Random [49152-65535]"
until [[ "$PORT_CHOICE" =~ ^[1-3]$ ]]; do
read -rp "Port choice [1-3]: " -e -i 1 PORT_CHOICE
done
case $PORT_CHOICE in
1)
PORT="1194"
;;
2)
until [[ "$PORT" =~ ^[0-9]+$ ]] && [ "$PORT" -ge 1 ] && [ "$PORT" -le 65535 ]; do
read -rp "Custom port [1-65535]: " -e -i 1194 PORT
done
;;
3)
# Generate random number within private ports range
PORT=$(shuf -i49152-65535 -n1)
echo "Random Port: $PORT"
;;
esac
echo ""
echo "What protocol do you want OpenVPN to use?"
echo "UDP is faster. Unless it is not available, you shouldn't use TCP."
echo " 1) UDP"
echo " 2) TCP"
until [[ "$PROTOCOL_CHOICE" =~ ^[1-2]$ ]]; do
read -rp "Protocol [1-2]: " -e -i 1 PROTOCOL_CHOICE
done
case $PROTOCOL_CHOICE in
1)
PROTOCOL="udp"
;;
2)
PROTOCOL="tcp"
;;
esac
echo ""
echo "What DNS resolvers do you want to use with the VPN?"
echo " 1) Current system resolvers (from /etc/resolv.conf)"
echo " 2) Self-hosted DNS Resolver (Unbound)"
echo " 3) Cloudflare (Anycast: worldwide)"
echo " 4) Quad9 (Anycast: worldwide)"
echo " 5) Quad9 uncensored (Anycast: worldwide)"
echo " 6) FDN (France)"
echo " 7) DNS.WATCH (Germany)"
echo " 8) OpenDNS (Anycast: worldwide)"
echo " 9) Google (Anycast: worldwide)"
echo " 10) Yandex Basic (Russia)"
echo " 11) AdGuard DNS (Russia)"
until [[ "$DNS" =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 ] && [ "$DNS" -le 11 ]; do
read -rp "DNS [1-10]: " -e -i 3 DNS
if [[ $DNS == 2 ]] && [[ -e /etc/unbound/unbound.conf ]]; then
echo ""
echo "Unbound is already installed."
echo "You can allow the script to configure it in order to use it from your OpenVPN clients"
echo "We will simply add a second server to /etc/unbound/unbound.conf for the OpenVPN subnet."
echo "No changes are made to the current configuration."
echo ""
until [[ $CONTINUE =~ (y|n) ]]; do
read -rp "Apply configuration changes to Unbound? [y/n]: " -e CONTINUE
done
if [[ $CONTINUE = "n" ]];then
# Break the loop and cleanup
unset DNS
unset CONTINUE
fi
fi
done
echo ""
echo "Do you want to use compression? It is not recommended since the VORACLE attack make use of it."
until [[ $COMPRESSION_ENABLED =~ (y|n) ]]; do
read -rp"Enable compression? [y/n]: " -e -i n COMPRESSION_ENABLED
done
if [[ $COMPRESSION_ENABLED == "y" ]];then
echo "Choose which compression algorithm you want to use:"
echo " 1) LZ4 (more efficient)"
echo " 2) LZ0"
until [[ $COMPRESSION_CHOICE =~ ^[1-2]$ ]]; do
read -rp"Compression algorithm [1-2]: " -e -i 1 COMPRESSION_CHOICE
done
case $COMPRESSION_CHOICE in
1)
COMPRESSION_ALG="lz4"
;;
2)
COMPRESSION_ALG="lzo"
;;
esac
fi
echo ""
echo "Do you want to customize encryption settings?"
echo "Unless you know what you're doing, you should stick with the default parameters provided by the script."
echo "Note that whatever you choose, all the choices presented in the script are safe. (Unlike OpenVPN's defaults)"
echo "See https://github.com/angristan/openvpn-install#security-and-encryption to learn more."
echo ""
until [[ $CUSTOMIZE_ENC =~ (y|n) ]]; do
read -rp "Customize encryption settings? [y/n]: " -e -i n CUSTOMIZE_ENC
done
if [[ $CUSTOMIZE_ENC == "n" ]];then
# Use default, sane and fast parameters
CIPHER="AES-128-GCM"
CERT_TYPE="1" # ECDSA
CERT_CURVE="prime256v1"
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"
DH_TYPE="1" # ECDH
DH_CURVE="prime256v1"
HMAC_ALG="SHA256"
TLS_SIG="1" # tls-crypt
else
echo ""
echo "Choose which cipher you want to use for the data channel:"
echo " 1) AES-128-GCM (recommended)"
echo " 2) AES-192-GCM"
echo " 3) AES-256-GCM"
echo " 4) AES-128-CBC"
echo " 5) AES-192-CBC"
echo " 6) AES-256-CBC"
until [[ "$CIPHER_CHOICE" =~ ^[1-6]$ ]]; do
read -rp "Cipher [1-6]: " -e -i 1 CIPHER_CHOICE
done
case $CIPHER_CHOICE in
1)
CIPHER="AES-128-GCM"
;;
2)
CIPHER="AES-192-GCM"
;;
3)
CIPHER="AES-256-GCM"
;;
4)
CIPHER="AES-128-CBC"
;;
5)
CIPHER="AES-192-CBC"
;;
6)
CIPHER="AES-256-CBC"
;;
esac
echo ""
echo "Choose what kind of certificate you want to use:"
echo " 1) ECDSA (recommended)"
echo " 2) RSA"
until [[ $CERT_TYPE =~ ^[1-2]$ ]]; do
read -rp"Certificate key type [1-2]: " -e -i 1 CERT_TYPE
done
case $CERT_TYPE in
1)
echo ""
echo "Choose which curve you want to use for the certificate's key:"
echo " 1) prime256v1 (recommended)"
echo " 2) secp384r1"
echo " 3) secp521r1"
until [[ $CERT_CURVE_CHOICE =~ ^[1-3]$ ]]; do
read -rp"Curve [1-3]: " -e -i 1 CERT_CURVE_CHOICE
done
case $CERT_CURVE_CHOICE in
1)
CERT_CURVE="prime256v1"
;;
2)
CERT_CURVE="secp384r1"
;;
3)
CERT_CURVE="secp521r1"
;;
esac
;;
2)
echo ""
echo "Choose which size you want to use for the certificate's RSA key:"
echo " 1) 2048 bits (recommended)"
echo " 2) 3072 bits"
echo " 3) 4096 bits"
until [[ "$RSA_KEY_SIZE_CHOICE" =~ ^[1-3]$ ]]; do
read -rp "RSA key size [1-3]: " -e -i 1 RSA_KEY_SIZE_CHOICE
done
case $RSA_KEY_SIZE_CHOICE in
1)
RSA_KEY_SIZE="2048"
;;
2)
RSA_KEY_SIZE="3072"
;;
3)
RSA_KEY_SIZE="4096"
;;
esac
;;
esac
echo ""
echo "Choose which cipher you want to use for the control channel:"
case $CERT_TYPE in
1)
echo " 1) ECDHE-ECDSA-AES-128-GCM-SHA256 (recommended)"
echo " 2) ECDHE-ECDSA-AES-256-GCM-SHA384"
until [[ $CC_CIPHER_CHOICE =~ ^[1-2]$ ]]; do
read -rp"Control channel cipher [1-2]: " -e -i 1 CC_CIPHER_CHOICE
done
case $CC_CIPHER_CHOICE in
1)
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"
;;
2)
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"
;;
esac
;;
2)
echo " 1) ECDHE-RSA-AES-128-GCM-SHA256 (recommended)"
echo " 2) ECDHE-RSA-AES-256-GCM-SHA384"
until [[ $CC_CIPHER_CHOICE =~ ^[1-2]$ ]]; do
read -rp"Control channel cipher [1-2]: " -e -i 1 CC_CIPHER_CHOICE
done
case $CC_CIPHER_CHOICE in
1)
CC_CIPHER="TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256"
;;
2)
CC_CIPHER="TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"
;;
esac
;;
esac
echo ""
echo "Choose what kind of Diffie-Hellman key you want to use:"
echo " 1) ECDH (recommended)"
echo " 2) DH"
until [[ $DH_TYPE =~ [1-2] ]]; do
read -rp"DH key type [1-2]: " -e -i 1 DH_TYPE
done
case $DH_TYPE in
1)
echo ""
echo "Choose which curve you want to use for the ECDH key:"
echo " 1) prime256v1 (recommended)"
echo " 2) secp384r1"
echo " 3) secp521r1"
while [[ $DH_CURVE_CHOICE != "1" && $DH_CURVE_CHOICE != "2" && $DH_CURVE_CHOICE != "3" ]]; do
read -rp"Curve [1-3]: " -e -i 1 DH_CURVE_CHOICE
done
case $DH_CURVE_CHOICE in
1)
DH_CURVE="prime256v1"
;;
2)
DH_CURVE="secp384r1"
;;
3)
DH_CURVE="secp521r1"
;;
esac
;;
2)
echo ""
echo "Choose what size of Diffie-Hellman key you want to use:"
echo " 1) 2048 bits (recommended)"
echo " 2) 3072 bits"
echo " 3) 4096 bits"
until [[ "$DH_KEY_SIZE_CHOICE" =~ ^[1-3]$ ]]; do
read -rp "DH key size [1-3]: " -e -i 1 DH_KEY_SIZE_CHOICE
done
case $DH_KEY_SIZE_CHOICE in
1)
DH_KEY_SIZE="2048"
;;
2)
DH_KEY_SIZE="3072"
;;
3)
DH_KEY_SIZE="4096"
;;
esac
;;
esac
echo ""
# The "auth" options behaves differently with AEAD ciphers
if [[ "$CIPHER" =~ CBC$ ]]; then
echo "The digest algorithm authenticates data channel packets and tls-auth packets from the control channel."
elif [[ "$CIPHER" =~ GCM$ ]]; then
echo "The digest algorithm authenticates tls-auth packets from the control channel."
fi
echo "Which digest algorithm do you want to use for HMAC?"
echo " 1) SHA-256 (recommended)"
echo " 2) SHA-384"
echo " 3) SHA-512"
until [[ $HMAC_ALG_CHOICE =~ ^[1-3]$ ]]; do
read -rp "Digest algorithm [1-3]: " -e -i 1 HMAC_ALG_CHOICE
done
case $HMAC_ALG_CHOICE in
1)
HMAC_ALG="SHA256"
;;
2)
HMAC_ALG="SHA384"
;;
3)
HMAC_ALG="SHA512"
;;
esac
echo ""
echo "You can add an additional layer of security to the control channel with tls-auth and tls-crypt"
echo "tls-auth authenticates the packets, while tls-crypt authenticate and encrypt them."
echo " 1) tls-crypt (recommended)"
echo " 2) tls-auth"
until [[ $TLS_SIG =~ [1-2] ]]; do
read -rp "Control channel additional security mechanism [1-2]: " -e -i 1 TLS_SIG
done
fi
echo ""
echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now."
echo "You will be able to generate a client at the end of the installation."
APPROVE_INSTALL=${APPROVE_INSTALL:-n}
if [[ $APPROVE_INSTALL =~ n ]]; then
read -n1 -r -p "Press any key to continue..."
fi
}
function installOpenVPN () {
if [[ $AUTO_INSTALL == "y" ]]; then
# Set default choices so that no questions will be asked.
APPROVE_INSTALL=${APPROVE_INSTALL:-y}
APPROVE_IP=${APPROVE_IP:-y}
IPV6_SUPPORT=${IPV6_SUPPORT:-n}
PORT_CHOICE=${PORT_CHOICE:-1}
PROTOCOL_CHOICE=${PROTOCOL_CHOICE:-1}
DNS=${DNS:-1}
COMPRESSION_ENABLED=${COMPRESSION_ENABLED:-n}
CUSTOMIZE_ENC=${CUSTOMIZE_ENC:-n}
CLIENT=${CLIENT:-client}
PASS=${PASS:-1}
CONTINUE=${CONTINUE:-y}
# Behind NAT, we'll default to the publicly reachable IPv4.
PUBLIC_IPV4=$(curl ifconfig.co)
ENDPOINT=${ENDPOINT:-$PUBLIC_IPV4}
fi
# Run setup questions first, and set other variales if auto-install
installQuestions
# Get the "public" interface from the default route
NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
if [[ "$OS" =~ (debian|ubuntu) ]]; then
apt-get update
apt-get -y install ca-certificates gnupg
# We add the OpenVPN repo to get the latest version.
if [[ "$VERSION_ID" = "8" ]]; then
echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
apt-get update
fi
if [[ "$VERSION_ID" = "16.04" ]]; then
echo "deb http://build.openvpn.net/debian/openvpn/stable trusty main" > /etc/apt/sources.list.d/openvpn.list
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
apt-get update
fi
# Ubuntu > 16.04 and Debian > 8 have OpenVPN >= 2.4 without the need of a third party repository.
apt-get install -y openvpn iptables openssl wget ca-certificates curl
elif [[ "$OS" = 'centos' ]]; then
yum install -y epel-release
yum install -y openvpn iptables openssl wget ca-certificates curl
elif [[ "$OS" = 'fedora' ]]; then
dnf install -y openvpn iptables openssl wget ca-certificates curl
elif [[ "$OS" = 'arch' ]]; then
# Install required dependencies and upgrade the system
pacman --needed --noconfirm -Syu openvpn iptables openssl wget ca-certificates curl
fi
# Find out if the machine uses nogroup or nobody for the permissionless group
if grep -qs "^nogroup:" /etc/group; then
NOGROUP=nogroup
else
NOGROUP=nobody
fi
# An old version of easy-rsa was available by default in some openvpn packages
if [[ -d /etc/openvpn/easy-rsa/ ]]; then
rm -rf /etc/openvpn/easy-rsa/
fi
# Install the latest version of easy-rsa from source
local version="3.0.6"
wget -O ~/EasyRSA-unix-v${version}.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v${version}/EasyRSA-unix-v${version}.tgz
tar xzf ~/EasyRSA-unix-v${version}.tgz -C ~/
mv ~/EasyRSA-v${version}/ /etc/openvpn/
mv /etc/openvpn/EasyRSA-v${version}/ /etc/openvpn/easy-rsa/
chown -R root:root /etc/openvpn/easy-rsa/
rm -f ~/EasyRSA-unix-v${version}.tgz
cd /etc/openvpn/easy-rsa/
case $CERT_TYPE in
1)
echo "set_var EASYRSA_ALGO ec" > vars
echo "set_var EASYRSA_CURVE $CERT_CURVE" >> vars
;;
2)
echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
;;
esac
# Generate a random, alphanumeric identifier of 16 characters for CN and one for server name
SERVER_CN="cn_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
SERVER_NAME="server_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
echo "set_var EASYRSA_REQ_CN $SERVER_CN" >> vars
# Create the PKI, set up the CA, the DH params and the server certificate
./easyrsa init-pki
./easyrsa --batch build-ca nopass
if [[ $DH_TYPE == "2" ]]; then
# ECDH keys are generated on-the-fly so we don't need to generate them beforehand
openssl dhparam -out dh.pem $DH_KEY_SIZE
fi
./easyrsa build-server-full "$SERVER_NAME" nopass
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
case $TLS_SIG in
1)
# Generate tls-crypt key
openvpn --genkey --secret /etc/openvpn/tls-crypt.key
;;
2)
# Generate tls-auth key
openvpn --genkey --secret /etc/openvpn/tls-auth.key
;;
esac
# Move all the generated files
cp pki/ca.crt pki/private/ca.key "pki/issued/$SERVER_NAME.crt" "pki/private/$SERVER_NAME.key" /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
if [[ $DH_TYPE == "2" ]]; then
cp dh.pem /etc/openvpn
fi
# Make cert revocation list readable for non-root
chmod 644 /etc/openvpn/crl.pem
# Generate server.conf
echo "port $PORT" > /etc/openvpn/server.conf
if [[ "$IPV6_SUPPORT" = 'n' ]]; then
echo "proto $PROTOCOL" >> /etc/openvpn/server.conf
elif [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo "proto ${PROTOCOL}6" >> /etc/openvpn/server.conf
fi
echo "dev tun
user nobody
group $NOGROUP
persist-key
persist-tun
keepalive 10 120
topology subnet
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
# DNS resolvers
case $DNS in
1)
# Locate the proper resolv.conf
# Needed for systems running systemd-resolved
if grep -q "127.0.0.53" "/etc/resolv.conf"; then
RESOLVCONF='/run/systemd/resolve/resolv.conf'
else
RESOLVCONF='/etc/resolv.conf'
fi
# Obtain the resolvers from resolv.conf and use them for OpenVPN
grep -v '#' $RESOLVCONF | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read -r line; do
echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
done
;;
2)
echo 'push "dhcp-option DNS 10.8.0.1"' >> /etc/openvpn/server.conf
;;
3) # Cloudflare
echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server.conf
;;
4) # Quad9
echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 149.112.112.112"' >> /etc/openvpn/server.conf
;;
5) # Quad9 uncensored
echo 'push "dhcp-option DNS 9.9.9.10"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 149.112.112.10"' >> /etc/openvpn/server.conf
;;
6) # FDN
echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
;;
7) # DNS.WATCH
echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
;;
8) # OpenDNS
echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
;;
9) # Google
echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
;;
10) # Yandex Basic
echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
;;
11) # AdGuard DNS
echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
;;
esac
echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
# IPv6 network settings if needed
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo 'server-ipv6 fd42:42:42:42::/112
tun-ipv6
push tun-ipv6
push "route-ipv6 2000::/3"
push "redirect-gateway ipv6"' >> /etc/openvpn/server.conf
fi
if [[ $COMPRESSION_ENABLED == "y" ]]; then
echo "compress $COMPRESSION_ALG" >> /etc/openvpn/server.conf
fi
if [[ $DH_TYPE == "1" ]]; then
echo "dh none" >> /etc/openvpn/server.conf
echo "ecdh-curve $DH_CURVE" >> /etc/openvpn/server.conf
elif [[ $DH_TYPE == "2" ]]; then
echo "dh dh.pem" >> /etc/openvpn/server.conf
fi
case $TLS_SIG in
1)
echo "tls-crypt tls-crypt.key 0" >> /etc/openvpn/server.conf
;;
2)
echo "tls-auth tls-auth.key 0" >> /etc/openvpn/server.conf
;;
esac
echo "crl-verify crl.pem
ca ca.crt
cert $SERVER_NAME.crt
key $SERVER_NAME.key
auth $HMAC_ALG
cipher $CIPHER
ncp-ciphers $CIPHER
tls-server
tls-version-min 1.2
tls-cipher $CC_CIPHER
status /var/log/openvpn/status.log
verb 3" >> /etc/openvpn/server.conf
# Create log dir
mkdir -p /var/log/openvpn
# Enable routing
echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.d/20-openvpn.conf
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo 'net.ipv6.conf.all.forwarding=1' >> /etc/sysctl.d/20-openvpn.conf
fi
# Avoid an unneeded reboot
sysctl --system
# If SELinux is enabled and a custom port was selected, we need this
if hash sestatus 2>/dev/null; then
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
if [[ "$PORT" != '1194' ]]; then
semanage port -a -t openvpn_port_t -p "$PROTOCOL" "$PORT"
fi
fi
fi
# Finally, restart and enable OpenVPN
if [[ "$OS" = 'arch' || "$OS" = 'fedora' ]]; then
# Don't modify package-provided service
cp /usr/lib/systemd/system/[email protected] /etc/systemd/system/[email protected]
# Workaround to fix OpenVPN service on OpenVZ
sed -i 's|LimitNPROC|#LimitNPROC|' /etc/systemd/system/[email protected]
# Another workaround to keep using /etc/openvpn/
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /etc/systemd/system/[email protected]
# On fedora, the service hardcodes the ciphers. We want to manage the cipher ourselves, so we remove it from the service
if [[ "$OS" == "fedora" ]];then
sed -i 's|--cipher AES-256-GCM --ncp-ciphers AES-256-GCM:AES-128-GCM:AES-256-CBC:AES-128-CBC:BF-CBC||' /etc/systemd/system/[email protected]
fi
systemctl daemon-reload
systemctl restart openvpn-server@server
systemctl enable openvpn-server@server
elif [[ "$OS" == "ubuntu" ]] && [[ "$VERSION_ID" == "16.04" ]]; then
# On Ubuntu 16.04, we use the package from the OpenVPN repo
# This package uses a sysvinit service
systemctl enable openvpn
systemctl start openvpn
else
# Don't modify package-provided service
cp /lib/systemd/system/openvpn\@.service /etc/systemd/system/openvpn\@.service
# Workaround to fix OpenVPN service on OpenVZ
sed -i 's|LimitNPROC|#LimitNPROC|' /etc/systemd/system/openvpn\@.service
# Another workaround to keep using /etc/openvpn/
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /etc/systemd/system/openvpn\@.service
systemctl daemon-reload
systemctl restart openvpn@server
systemctl enable openvpn@server
fi
if [[ $DNS == 2 ]];then
installUnbound
fi
# Add iptables rules in two scripts
mkdir /etc/iptables
# Script to add rules
echo "#!/bin/sh
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o $NIC -j MASQUERADE
iptables -A INPUT -i tun0 -j ACCEPT
iptables -A FORWARD -i $NIC -o tun0 -j ACCEPT
iptables -A FORWARD -i tun0 -o $NIC -j ACCEPT
iptables -A INPUT -i $NIC -p $PROTOCOL --dport $PORT -j ACCEPT" > /etc/iptables/add-openvpn-rules.sh
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo "ip6tables -t nat -A POSTROUTING -s fd42:42:42:42::/112 -o $NIC -j MASQUERADE
ip6tables -A INPUT -i tun0 -j ACCEPT
ip6tables -A FORWARD -i $NIC -o tun0 -j ACCEPT
ip6tables -A FORWARD -i tun0 -o $NIC -j ACCEPT" >> /etc/iptables/add-openvpn-rules.sh
fi
# Script to remove rules
echo "#!/bin/sh
iptables -t nat -D POSTROUTING -s 10.8.0.0/24 -o $NIC -j MASQUERADE
iptables -D INPUT -i tun0 -j ACCEPT
iptables -D FORWARD -i $NIC -o tun0 -j ACCEPT
iptables -D FORWARD -i tun0 -o $NIC -j ACCEPT
iptables -D INPUT -i $NIC -p $PROTOCOL --dport $PORT -j ACCEPT" > /etc/iptables/rm-openvpn-rules.sh
if [[ "$IPV6_SUPPORT" = 'y' ]]; then
echo "ip6tables -t nat -D POSTROUTING -s fd42:42:42:42::/112 -o $NIC -j MASQUERADE
ip6tables -D INPUT -i tun0 -j ACCEPT
ip6tables -D FORWARD -i $NIC -o tun0 -j ACCEPT
ip6tables -D FORWARD -i tun0 -o $NIC -j ACCEPT" >> /etc/iptables/rm-openvpn-rules.sh
fi
chmod +x /etc/iptables/add-openvpn-rules.sh
chmod +x /etc/iptables/rm-openvpn-rules.sh
# Handle the rules via a systemd script
echo "[Unit]
Description=iptables rules for OpenVPN
Before=network-online.target
Wants=network-online.target
[Service]
Type=oneshot
ExecStart=/etc/iptables/add-openvpn-rules.sh
ExecStop=/etc/iptables/rm-openvpn-rules.sh
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/iptables-openvpn.service
# Enable service and apply rules
systemctl daemon-reload
systemctl enable iptables-openvpn
systemctl start iptables-openvpn
# If the server is behind a NAT, use the correct IP address for the clients to connect to
if [[ "$ENDPOINT" != "" ]]; then
IP=$ENDPOINT
fi
# client-template.txt is created so we have a template to add further users later
echo "client" > /etc/openvpn/client-template.txt
if [[ "$PROTOCOL" = 'udp' ]]; then
echo "proto udp" >> /etc/openvpn/client-template.txt
elif [[ "$PROTOCOL" = 'tcp' ]]; then
echo "proto tcp-client" >> /etc/openvpn/client-template.txt
fi
echo "remote $IP $PORT
dev tun
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
verify-x509-name $SERVER_NAME name
auth $HMAC_ALG
auth-nocache
cipher $CIPHER
tls-client
tls-version-min 1.2
tls-cipher $CC_CIPHER
setenv opt block-outside-dns # Prevent Windows 10 DNS leak
verb 3" >> /etc/openvpn/client-template.txt
if [[ $COMPRESSION_ENABLED == "y" ]]; then
echo "compress $COMPRESSION_ALG" >> /etc/openvpn/client-template.txt
fi
# Generate the custom client.ovpn
newClient
echo "If you want to add more clients, you simply need to run this script another time!"
}
function newClient () {
echo ""
echo "Tell me a name for the client."
echo "Use one word only, no special characters."
until [[ "$CLIENT" =~ ^[a-zA-Z0-9_]+$ ]]; do
read -rp "Client name: " -e CLIENT
done
echo ""
echo "Do you want to protect the configuration file with a password?"
echo "(e.g. encrypt the private key with a password)"
echo " 1) Add a passwordless client"
echo " 2) Use a password for the client"
until [[ "$PASS" =~ ^[1-2]$ ]]; do
read -rp "Select an option [1-2]: " -e -i 1 PASS
done
cd /etc/openvpn/easy-rsa/ || return
case $PASS in
1)
./easyrsa build-client-full "$CLIENT" nopass
;;
2)
echo "⚠️ You will be asked for the client password below ⚠️"
./easyrsa build-client-full "$CLIENT"
;;
esac
# Home directory of the user, where the client configuration (.ovpn) will be written
if [ -e "/home/$CLIENT" ]; then # if $1 is a user name
homeDir="/home/$CLIENT"
elif [ "${SUDO_USER}" ]; then # if not, use SUDO_USER
homeDir="/home/${SUDO_USER}"
else # if not SUDO_USER, use /root
homeDir="/root"
fi
# Determine if we use tls-auth or tls-crypt
if grep -qs "^tls-crypt" /etc/openvpn/server.conf; then
TLS_SIG="1"
elif grep -qs "^tls-auth" /etc/openvpn/server.conf; then
TLS_SIG="2"
fi
# Generates the custom client.ovpn
cp /etc/openvpn/client-template.txt "$homeDir/$CLIENT.ovpn"
{
echo "<ca>"
cat "/etc/openvpn/easy-rsa/pki/ca.crt"
echo "</ca>"