forked from kylemanna/docker-openvpn
-
Notifications
You must be signed in to change notification settings - Fork 0
/
ovpn_genconfig
executable file
·412 lines (366 loc) · 10.6 KB
/
ovpn_genconfig
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
#!/bin/bash
#
# Generate OpenVPN configs
#
TMP_PUSH_CONFIGFILE=$(mktemp -t vpn_push.XXXXXXX)
TMP_ROUTE_CONFIGFILE=$(mktemp -t vpn_route.XXXXXXX)
TMP_EXTRA_CONFIGFILE=$(mktemp -t vpn_extra.XXXXXXX)
#Traceback on Error and Exit come from https://docwhat.org/tracebacks-in-bash/
set -eu
_showed_traceback=f
traceback() {
# Hide the traceback() call.
local -i start=$(( ${1:-0} + 1 ))
local -i end=${#BASH_SOURCE[@]}
local -i i=0
local -i j=0
echo "Traceback (last called is first):" 1>&2
for ((i=${start}; i < ${end}; i++)); do
j=$(( $i - 1 ))
local function="${FUNCNAME[$i]}"
local file="${BASH_SOURCE[$i]}"
local line="${BASH_LINENO[$j]}"
echo " ${function}() in ${file}:${line}" 1>&2
done
}
on_error() {
local _ec="$?"
local _cmd="${BASH_COMMAND:-unknown}"
traceback 1
_showed_traceback=t
echo "The command ${_cmd} exited with exit code ${_ec}." 1>&2
}
trap on_error ERR
on_exit() {
echo "Cleaning up before Exit ..."
rm -f $TMP_PUSH_CONFIGFILE
rm -f $TMP_ROUTE_CONFIGFILE
rm -f $TMP_EXTRA_CONFIGFILE
local _ec="$?"
if [[ $_ec != 0 && "${_showed_traceback}" != t ]]; then
traceback 1
fi
}
trap on_exit EXIT
# Convert 1.2.3.4/24 -> 255.255.255.0
cidr2mask()
{
local i
local subnetmask=""
local cidr=${1#*/}
local full_octets=$(($cidr/8))
local partial_octet=$(($cidr%8))
for ((i=0;i<4;i+=1)); do
if [ $i -lt $full_octets ]; then
subnetmask+=255
elif [ $i -eq $full_octets ]; then
subnetmask+=$((256 - 2**(8-$partial_octet)))
else
subnetmask+=0
fi
[ $i -lt 3 ] && subnetmask+=.
done
echo $subnetmask
}
# Used often enough to justify a function
getroute() {
echo ${1%/*} $(cidr2mask $1)
}
usage() {
echo "usage: $0 [-d]"
echo " -u SERVER_PUBLIC_URL"
echo " [-e EXTRA_SERVER_CONFIG ]"
echo " [-E EXTRA_CLIENT_CONFIG ]"
echo " [-f FRAGMENT ]"
echo " [-n DNS_SERVER ...]"
echo " [-p PUSH ...]"
echo " [-r ROUTE ...]"
echo " [-s SERVER_SUBNET]"
echo
echo "optional arguments:"
echo " -2 Enable two factor authentication using Google Authenticator."
echo " -a Authenticate packets with HMAC using the given message digest algorithm (auth)."
echo " -b Disable 'push block-outside-dns'"
echo " -c Enable client-to-client option"
echo " -C A list of allowable TLS ciphers delimited by a colon (cipher)."
echo " -d Disable default route"
echo " -D Do not push dns servers"
echo " -k Set keepalive. Default: '10 60'"
echo " -m Set client MTU"
echo " -N Configure NAT to access external server network"
echo " -t Use TAP device (instead of TUN device)"
echo " -T Encrypt packets with the given cipher algorithm instead of the default one (tls-cipher)."
echo " -z Enable comp-lzo compression."
}
process_route_config() {
local ovpn_route_config=''
ovpn_route_config="$1"
# If user passed "0" skip this, assume no extra routes
[[ "$ovpn_route_config" == "0" ]] && break;
echo "Processing Route Config: '${ovpn_route_config}'"
[[ -n "$ovpn_route_config" ]] && echo "route $(getroute $ovpn_route_config)" >> "$TMP_ROUTE_CONFIGFILE"
}
process_push_config() {
local ovpn_push_config=''
ovpn_push_config="$1"
echo "Processing PUSH Config: '${ovpn_push_config}'"
[[ -n "$ovpn_push_config" ]] && echo "push \"$ovpn_push_config\"" >> "$TMP_PUSH_CONFIGFILE"
}
process_extra_config() {
local ovpn_extra_config=''
ovpn_extra_config="$1"
echo "Processing Extra Config: '${ovpn_extra_config}'"
[[ -n "$ovpn_extra_config" ]] && echo "$ovpn_extra_config" >> "$TMP_EXTRA_CONFIGFILE"
}
if [ "${DEBUG:-}" == "1" ]; then
set -x
fi
set -e
if [ -z "${OPENVPN:-}" ]; then
export OPENVPN="$PWD"
fi
if [ -z "${EASYRSA_PKI:-}" ]; then
export EASYRSA_PKI="$OPENVPN/pki"
fi
OVPN_AUTH=''
OVPN_CIPHER=''
OVPN_CLIENT_TO_CLIENT=''
OVPN_CN=''
OVPN_COMP_LZO=0
OVPN_DEFROUTE=1
OVPN_DEVICE="tun"
OVPN_DEVICEN=0
OVPN_DISABLE_PUSH_BLOCK_DNS=0
OVPN_DNS=1
OVPN_DNS_SERVERS=()
OVPN_ENV=${OPENVPN}/ovpn_env.sh
OVPN_EXTRA_CLIENT_CONFIG=()
OVPN_EXTRA_SERVER_CONFIG=()
OVPN_FRAGMENT=''
OVPN_KEEPALIVE="10 60"
OVPN_MTU=''
OVPN_NAT=0
OVPN_PORT=''
OVPN_PROTO=''
OVPN_PUSH=()
OVPN_ROUTES=()
OVPN_SERVER=192.168.255.0/24
OVPN_SERVER_URL=''
OVPN_TLS_CIPHER=''
# Import existing configuration if present
[ -r "$OVPN_ENV" ] && source "$OVPN_ENV"
# Parse arguments
while getopts ":a:e:E:C:T:r:s:du:bcp:n:k:DNm:f:tz2" opt; do
case $opt in
a)
OVPN_AUTH="$OPTARG"
;;
e)
mapfile -t TMP_EXTRA_SERVER_CONFIG <<< "$OPTARG"
for i in "${TMP_EXTRA_SERVER_CONFIG[@]}"; do
OVPN_EXTRA_SERVER_CONFIG+=("$i")
done
;;
E)
mapfile -t TMP_EXTRA_CLIENT_CONFIG <<< "$OPTARG"
for i in "${TMP_EXTRA_CLIENT_CONFIG[@]}"; do
OVPN_EXTRA_CLIENT_CONFIG+=("$i")
done
;;
C)
OVPN_CIPHER="$OPTARG"
;;
T)
OVPN_TLS_CIPHER="$OPTARG"
;;
r)
mapfile -t TMP_ROUTES <<< "$OPTARG"
for i in "${TMP_ROUTES[@]}"; do
OVPN_ROUTES+=("$i")
done
;;
s)
OVPN_SERVER="$OPTARG"
;;
d)
OVPN_DEFROUTE=0
OVPN_DISABLE_PUSH_BLOCK_DNS=1
;;
u)
OVPN_SERVER_URL="$OPTARG"
;;
b)
OVPN_DISABLE_PUSH_BLOCK_DNS=1
;;
c)
OVPN_CLIENT_TO_CLIENT=1
;;
p)
mapfile -t TMP_PUSH <<< "$OPTARG"
for i in "${TMP_PUSH[@]}"; do
OVPN_PUSH+=("$i")
done
;;
n)
mapfile -t TMP_DNS_SERVERS <<< "$OPTARG"
for i in "${TMP_DNS_SERVERS[@]}"; do
OVPN_DNS_SERVERS+=("$i")
done
;;
D)
OVPN_DNS=0
;;
N)
OVPN_NAT=1
;;
k)
OVPN_KEEPALIVE="$OPTARG"
;;
m)
OVPN_MTU="$OPTARG"
;;
t)
OVPN_DEVICE="tap"
;;
z)
OVPN_COMP_LZO=1
;;
2)
OVPN_OTP_AUTH=1
;;
f)
OVPN_FRAGMENT="$OPTARG"
;;
\?)
set +x
echo "Invalid option: -$OPTARG" >&2
usage
exit 1
;;
:)
set +x
echo "Option -$OPTARG requires an argument." >&2
usage
exit 1
;;
esac
done
# Create ccd directory for static routes
[ ! -d "${OPENVPN:-}/ccd" ] && mkdir -p ${OPENVPN:-}/ccd
# Server name is in the form "udp://vpn.example.com:1194"
if [[ "${OVPN_SERVER_URL:-}" =~ ^((udp|tcp|udp6|tcp6)://)?([0-9a-zA-Z\.\-]+)(:([0-9]+))?$ ]]; then
OVPN_PROTO=${BASH_REMATCH[2]};
OVPN_CN=${BASH_REMATCH[3]};
OVPN_PORT=${BASH_REMATCH[5]};
else
set +x
echo "Common name not specified, see '-u'"
usage
exit 1
fi
# Apply defaults. If dns servers were not defined with -n, use google nameservers
set +u
[ -z "$OVPN_DNS_SERVERS" ] && OVPN_DNS_SERVERS=("8.8.8.8" "8.8.4.4")
[ -z "$OVPN_PROTO" ] && OVPN_PROTO=udp
[ -z "$OVPN_PORT" ] && OVPN_PORT=1194
set -u
[ "${#OVPN_ROUTES[@]}" == "0" ] && [ "$OVPN_DEFROUTE" == "1" ] && OVPN_ROUTES+=("192.168.254.0/24")
# Preserve config
if [ -f "$OVPN_ENV" ]; then
bak_env=$OVPN_ENV.$(date +%s).bak
echo "Backing up $OVPN_ENV -> $bak_env"
mv "$OVPN_ENV" "$bak_env"
fi
# Save the current OVPN_ vars to the ovpn_env.sh file
(set | grep '^OVPN_') | while read -r var; do
echo "declare -x $var" >> "$OVPN_ENV"
done
conf=${OPENVPN:-}/openvpn.conf
if [ -f "$conf" ]; then
bak=$conf.$(date +%s).bak
echo "Backing up $conf -> $bak"
mv "$conf" "$bak"
fi
# Echo extra client configurations
if [ ${#OVPN_EXTRA_CLIENT_CONFIG[@]} -gt 0 ]; then
for i in "${OVPN_EXTRA_CLIENT_CONFIG[@]}"; do
echo "Processing Extra Client Config: $i"
done
fi
cat > "$conf" <<EOF
server $(getroute $OVPN_SERVER)
verb 3
key $EASYRSA_PKI/private/${OVPN_CN}.key
ca $EASYRSA_PKI/ca.crt
cert $EASYRSA_PKI/issued/${OVPN_CN}.crt
dh $EASYRSA_PKI/dh.pem
tls-auth $EASYRSA_PKI/ta.key
key-direction 0
keepalive $OVPN_KEEPALIVE
persist-key
persist-tun
proto $OVPN_PROTO
# Rely on Docker to do port mapping, internally always 1194
port 1194
dev $OVPN_DEVICE$OVPN_DEVICEN
status /tmp/openvpn-status.log
user nobody
group nogroup
EOF
if [ "${OVPN_DISABLE_PUSH_BLOCK_DNS}" == "1" ]; then
echo "Disable default push of 'block-outside-dns'"
else
process_push_config "block-outside-dns"
fi
[ -n "$OVPN_TLS_CIPHER" ] && echo "tls-cipher $OVPN_TLS_CIPHER" >> "$conf"
[ -n "$OVPN_CIPHER" ] && echo "cipher $OVPN_CIPHER" >> "$conf"
[ -n "$OVPN_AUTH" ] && echo "auth $OVPN_AUTH" >> "$conf"
[ -n "${OVPN_CLIENT_TO_CLIENT:-}" ] && echo "client-to-client" >> "$conf"
[ "$OVPN_COMP_LZO" == "1" ] && echo "comp-lzo" >> "$conf"
[ "$OVPN_COMP_LZO" == "0" ] && echo "comp-lzo no" >> "$conf"
[ -n "${OVPN_FRAGMENT:-}" ] && echo "fragment $OVPN_FRAGMENT" >> "$conf"
# Append route commands
if [ ${#OVPN_ROUTES[@]} -gt 0 ]; then
for i in "${OVPN_ROUTES[@]}"; do
process_route_config "$i"
done
echo -e "\n### Route Configurations Below" >> "$conf"
cat $TMP_ROUTE_CONFIGFILE >> "$conf"
fi
# Append push commands
[ "$OVPN_DNS" == "1" ] && for i in "${OVPN_DNS_SERVERS[@]}"; do
process_push_config "dhcp-option DNS $i"
done
if [ "$OVPN_COMP_LZO" == "0" ]; then
process_push_config "comp-lzo no"
fi
[ ${#OVPN_PUSH[@]} -gt 0 ] && for i in "${OVPN_PUSH[@]}"; do
process_push_config "$i"
done
echo -e "\n### Push Configurations Below" >> "$conf"
cat $TMP_PUSH_CONFIGFILE >> "$conf"
# Append optional OTP authentication support
if [ -n "${OVPN_OTP_AUTH:-}" ]; then
echo -e "\n\n# Enable OTP+PAM for user authentication" >> "$conf"
echo "plugin /usr/lib/openvpn/plugins/openvpn-plugin-auth-pam.so openvpn" >> "$conf"
echo "reneg-sec 0" >> "$conf"
fi
# Append extra server configurations
if [ ${#OVPN_EXTRA_SERVER_CONFIG[@]} -gt 0 ]; then
for i in "${OVPN_EXTRA_SERVER_CONFIG[@]}"; do
process_extra_config "$i"
done
echo -e "\n### Extra Configurations Below" >> "$conf"
cat $TMP_EXTRA_CONFIGFILE >> "$conf"
fi
set +e
# Clean-up duplicate configs
if diff -q "${bak_env:-}" "$OVPN_ENV" 2>/dev/null; then
echo "Removing duplicate back-up: $bak_env"
rm -fv "$bak_env"
fi
if diff -q "${bak:-}" "$conf" 2>/dev/null; then
echo "Removing duplicate back-up: $bak"
rm -fv "$bak"
fi
echo "Successfully generated config"