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
|
#!/bin/bash
set -e
. /usr/share/debconf/confmodule
# This is taken from the package libnss-mdns and edited to do the same thing
# but for GNS insteand of mdns. try to insert gns entries to the "hosts" line
# in /etc/nsswitch.conf to automatically enable nss-gns support; do not change
# the configuration if the "hosts" line already references some gns lookups
insert_gns() {
echo -n "Checking NSS setup..."
# abort if /etc/nsswitch.conf does not exist
if ! [ -e /etc/nsswitch.conf ]; then
echo "Could not find /etc/nsswitch.conf."
return 1
fi
perl -i -pe '
sub insert {
# this also splits on tab
my @bits=split(" ", shift);
# do not break configuration if the "hosts" line already references gns
if (grep { $_ eq "gns"} @bits) {
return join " ", @bits;
}
# change "dns" or "resolve", whichever comes first, into
# "gns [NOTFOUND=return] dns"
foreach my $bit (@bits) {
if ($bit eq "dns") {
$bit = "gns [NOTFOUND=return] $bit";
last;
}
}
return join " ", @bits;
}
s/^(hosts:\s+)(.*)/$1.insert($2)/e;
' /etc/nsswitch.conf
echo " done."
}
case "${1}" in
configure)
db_version 2.0
db_get gnunet-systempeer/username
_USERNAME="${RET:-gnunet}"
db_get gnunet-systempeer/groupname
_GROUPNAME="${RET:-gnunet}"
db_get gnunet-systempeer/autostart
_AUTOSTART="${RET}" # boolean
db_get gnunet-dns/libnsswitch
_LIBNSSWITCH="${RET}" # boolean
db_get gnunet-user/proxy
_PROXY="${RET}" # boolean
db_stop
CONFIG_FILE="/etc/default/gnunet"
# Read default values
GNUNET_HOME="/var/lib/gnunet"
eval $(grep GNUNET_HOME /etc/gnunet.conf | tr -d '[:blank:]')
# Creating gnunet group if needed
if ! getent group ${_GROUPNAME} > /dev/null
then
echo -n "Creating new GNUnet group ${_GROUPNAME}:"
addgroup --quiet --system ${_GROUPNAME}
echo " done."
fi
# Creating gnunet user if needed
if ! getent passwd ${_USERNAME} > /dev/null
then
echo -n "Creating new GNUnet user ${_USERNAME}:"
adduser --quiet --system --ingroup ${_GROUPNAME} --home ${GNUNET_HOME} ${_USERNAME}
echo " done."
fi
# Add a special secured group
GNUNETDNS_GROUP="gnunetdns"
# Creating gnunetdns group if needed
if ! getent group ${GNUNETDNS_GROUP} > /dev/null
then
echo -n "Creating new secured GNUnet group ${GNUNETDNS_GROUP}:"
addgroup --quiet --system ${GNUNETDNS_GROUP}
echo " done."
fi
# Copy the libnss_gns files to the libnss directory
if ${_LIBNSSWITCH}
then
echo "Editing /etc/nsswitch.conf to use GNS before DNS"
# $2 equals the currently installed version if it exists
if [ -z "$2" ]; then
# first install: setup the recommended configuration (unless
# nsswitch.conf already contains mdns entries)
insert_gns
if [ "$?" -gt 0 ]; then
echo "nsswitch does not exist on this system"
fi
fi
echo " done."
fi
# Install GNUnet configuration for all users provided non exists
userlist=$(awk -F ':' '$3>=1000 && $3<2000 {print $1}' /etc/passwd)
users=($userlist)
homedirlist=$(awk -F ':' '$3>=1000 && $3<2000 {print $6}' /etc/passwd)
homedirs=($homedirlist)
for (( i=0; i<${#users[@]}; i++ )); do
usermod -aG gnunet ${users[$i]}
if [ -n "$i" ] && [ -d "${homedirs[$i]}" ]; then
mkdir -p ${homedirs[$i]}/.config/systemd/user/
cat > "${homedirs[$i]}/.config/systemd/user/gnunet-user.service" << EOF
# Copyright (C) 2019 GNUnet e.V.
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without any warranty.
[Unit]
Description=Service that runs a GNUnet for the user gnunet
After=network.target
[Service]
Type=forking
ExecStart=/usr/bin/gnunet-arm -s -c ${homedirs[$i]}/.config/gnunet.conf
ExecStop=/usr/bin/gnunet-arm -e -c ${homedirs[$i]}/.config/gnunet.conf
[Install]
WantedBy=multi-user.target
EOF
chown "${users[$i]}":"${users[$i]}" "${homedirs[$i]}/.config/systemd/user/gnunet-user.service"
if [ ! -f "${homedirs[$i]}/.config/gnunet.conf" ]; then
mkdir -p ${homedirs[$i]}/.config/
cp /etc/skel/.config/gnunet.conf "${homedirs[$i]}/.config/gnunet.conf"
chmod 644 "${homedirs[$i]}/.config/gnunet.conf"
fi
fi
port=$((8000+$(id -u "${users[$i]}")))
gnunet-config -c "${homedirs[$i]}/.config/gnunet.conf" \
--section=gns-proxy \
--option=IMMEDIATE_START \
--value=YES
gnunet-config -c "${homedirs[$i]}/.config/gnunet.conf" \
--section=gns-proxy \
--option=OPTIONS \
--value="-p $port"
chown "${users[$i]}":"${users[$i]}" "${homedirs[$i]}/.config/gnunet.conf"
done
# Change the proxy settings for Firefox and Chromium if desired
if ${_PROXY}
then
mkdir -p /etc/X11/xinit/xinitrc.d/
cat > "/etc/X11/xinit/xinitrc.d/80-gnunet-user-services" << "EOF"
#!/bin/bash
systemctl --user daemon-reload
systemctl --user start gnunet-user
systemctl --user enable gnunet-user
user=$(whoami)
gnunet_proxy=$(gnunet-config -c /etc/skel/.config/gnunet.conf -s gns-proxy | grep 'IMMEDIATE_START = YES')
# Enable GNS proxy for new users informed by /etc/skel.
if [ "$gnunet_proxy" ]; then
# Calculate user specific port
port=$((8000+$(id -u $user)))
gnunet-config -c $HOME/.config/gnunet.conf \
--section=gns-proxy \
--option=OPTIONS \
--value="-p $port"
# Firefox
defaultprofile=$(ls $HOME/.mozilla/firefox/*.default)
if [ ! "$defaultprofile" ];then
timeout 3s firefox --headless # dirty: create profile if not existent
fi
for ffprofile in $HOME/.mozilla/firefox/*.*/; do
js=$ffprofile/user.js
if [ -f "$js" ]; then
sed -i '/Preferences for using the GNU Name System/d' "$js"
sed -i '/network.proxy.socks/d' "$js"
sed -i '/network.proxy.socks_port/d' "$js"
sed -i '/network.proxy.socks_remote_dns/d' "$js"
sed -i '/network.proxy.type/d' "$js"
fi
echo "// Preferences for using the GNU Name System" >> "$js"
echo "user_pref(\"network.proxy.socks\", \"localhost\");" >> "$js"
echo "user_pref(\"network.proxy.socks_port\", $port);" >> "$js"
echo "user_pref(\"network.proxy.socks_remote_dns\", true);" >> "$js"
echo "user_pref(\"network.proxy.type\", 1);" >> "$js"
done
# Chromium
profile="$HOME/.profile"
if [ -f "$profile" ]; then
sed -i '/CHROMIUM_USER_FLAGS/d' "$profile"
fi
echo "export CHROMIUM_USER_FLAGS=--proxy-server=socks5://localhost:$port" \
>> "$profile"
fi
# Create/Renew GNS certificate authority (CA) per user.
gnunet-gns-proxy-setup-ca
EOF
fi
# Update files and directories permissions.
# Assuming default values, this *should* not be changed.
echo -n "Updating files and directories permissions:"
chown -R ${_USERNAME}:${_GROUPNAME} /var/log/gnunetd
chown -R ${_USERNAME}:${_GROUPNAME} ${GNUNET_HOME}
# Secure access to the data directory
chmod 0700 "${GNUNET_HOME}" || true
# Restrict access on setuid binaries
for file in /usr/bin/gnunet-helper-exit \
/usr/bin/gnunet-helper-nat-client \
/usr/bin/gnunet-helper-nat-server \
/usr/bin/gnunet-helper-transport-bluetooth \
/usr/bin/gnunet-helper-transport-wlan \
/usr/bin/gnunet-helper-vpn
do
# only do something when no setting exists
if ! dpkg-statoverride --list $file >/dev/null 2>&1 && [ -e $file ]
then
chown root:${_GROUPNAME} $file
chmod 4750 $file
fi
done
if ! dpkg-statoverride --list /usr/bin/gnunet-helper-dns >/dev/null 2>&1 \
&& [ -e /usr/bin/gnunet-helper-dns ]
then
chown root:${GNUNETDNS_GROUP} /usr/bin/gnunet-helper-dns
chmod 4750 /usr/bin/gnunet-helper-dns
fi
if ! dpkg-statoverride --list /usr/bin/gnunet-service-dns >/dev/null 2>&1 \
&& [ -e /usr/bin/gnunet-service-dns ]
then
chown ${_USERNAME}:${GNUNETDNS_GROUP} /usr/bin/gnunet-service-dns
chmod 2750 /usr/bin/gnunet-service-dns
fi
echo " done."
# Writing new values to configuration file
echo -n "Writing new configuration file:"
CONFIG_NEW=$(tempfile)
cat > "${CONFIG_NEW}" <<EOF
# This file controls the behaviour of the GNUnet init script.
# It will be parsed as a shell script.
# please do not edit by hand, use 'dpkg-reconfigure gnunet-systempeer'.
GNUNET_USER=${_USERNAME}
GNUNET_GROUP=${_GROUPNAME}
GNUNET_AUTOSTART="${_AUTOSTART}"
EOF
cat > "/etc/systemd/system/gnunet.service" <<EOF
[Unit]
Description=A framework for secure peer-to-peer networking
[Service]
EnvironmentFile=/etc/default/gnunet
User=${_USERNAME}
Type=forking
ExecStart=/usr/bin/gnunet-arm -s -c /etc/gnunet.conf
ExecStop=/usr/bin/gnunet-arm -e -c /etc/gnunet.conf
[Install]
WantedBy=multi-user.target
EOF
cp -f "${CONFIG_NEW}" "${CONFIG_FILE}"
echo " done."
# Cleaning
rm -f "${CONFIG_NEW}"
echo "All done."
;;
abort-upgrade|abort-remove|abort-deconfigure)
;;
*)
echo "postinst called with unknown argument \`${1}'" >&2
exit 1
;;
esac
#DEBHELPER#
exit 0
|