2 # The Girocco jail setup script
4 # If the first parameter is "dbonly", setup the database only
6 # We are designed to set up the chroot based on the output of
7 # `uname -s` by sourcing a suitable system-specific script.
8 # Unrecognized systems will generate an error. When using
9 # "dbonly" the setup of the chroot binaries is skipped so the
10 # output of `uname -s` does not matter in that case.
16 getent
="$srcdir/getent"
20 [ "$1" != "dbonly" ] || dbonly
=1
22 reserved_users
="root sshd _sshd mob nobody everyone $cfg_cgi_user $cfg_mirror_user"
24 # Require either sshd or _sshd user unless "dbonly"
26 if ! "$getent" passwd sshd
>/dev
/null
&& ! "$getent" passwd _sshd
>/dev
/null
; then
27 if [ -n "$dbonly" ]; then
28 if [ ! -s etc
/passwd
]; then
29 # Only complain on initial etc/passwd creation
30 echo "WARNING: no sshd or _sshd user, omitting entries from chroot etc/passwd"
34 echo "*** Error: You do not have required sshd or _sshd user in system." >&2
38 "$getent" passwd sshd
>/dev
/null || sshd_user
=_sshd
41 # Verify we have all we need
42 if ! "$getent" passwd
"$cfg_mirror_user" >/dev
/null
; then
43 echo "*** Error: You do not have \"$cfg_mirror_user\" user in system yet." >&2
46 if ! "$getent" passwd
"$cfg_cgi_user" >/dev
/null
; then
47 echo "*** Error: You do not have \"$cfg_cgi_user\" user in system yet." >&2
50 if [ -n "$dbonly" -a -z "$cfg_owning_group" ]; then
51 cfg_owning_group
="$("$getent" passwd "$cfg_mirror_user" | cut -d : -f 4)"
52 elif ! "$getent" group
"$cfg_owning_group" >/dev
/null
; then
53 echo "*** Error: You do not have \"$cfg_owning_group\" group in system yet." >&2
57 # One last paranoid check before we go writing all over everything
58 if [ -z "$cfg_chroot" -o "$cfg_chroot" = "/" ]; then
59 echo "*** Error: chroot location is not set or is invalid." >&2
60 echo "*** Error: perhaps you have an incorrect Config.pm?" >&2
65 mkdir
-p "$cfg_chroot"
67 chmod 755 "$cfg_chroot" ||
68 echo "WARNING: Cannot chmod $cfg_chroot"
70 # Set up basic user/group configuration; if there isn't any already
72 [ -n "$cfg_mob" ] || mobpass
='x'
74 if [ ! -s etc
/passwd
]; then
76 root:x:0:0:system administrator:/var/empty:/bin/false
77 nobody:x:$("$getent" passwd nobody | cut -d : -f 3-4):unprivileged user:/var/empty:/bin/false
79 [ -z "$sshd_user" ] ||
cat >>etc
/passwd
<<EOT
80 sshd:x:$("$getent" passwd $sshd_user | cut -d : -f 3-4):privilege separation:/var/empty:/bin/false
81 _sshd:x:$("$getent" passwd $sshd_user | cut -d : -f 3-4):privilege separation:/var/empty:/bin/false
83 cat >>etc
/passwd
<<EOT
84 $cfg_cgi_user:x:$("$getent" passwd "$cfg_cgi_user" | cut -d : -f 3-5):/:/bin/true
85 $cfg_mirror_user:x:$("$getent" passwd "$cfg_mirror_user" | cut -d : -f 3-5):/:/bin/true
86 everyone:x:65537:$("$getent" group "$cfg_owning_group" | cut -d : -f 3):every user:/:/bin/false
87 mob:$mobpass:65538:$("$getent" group "$cfg_owning_group" | cut -d : -f 3):the mob:/:/bin/git-shell-verify
89 elif [ -z "$dbonly" ]; then
90 # Make sure an sshd entry is present
91 if ! grep -q '^sshd:' etc
/passwd
; then
92 echo "*** Error: chroot etc/passwd exists but lacks sshd entry." >&2
97 if [ ! -s etc
/group
]; then
99 _repo:x:$("$getent" group "$cfg_owning_group" | cut -d : -f 3):$cfg_mirror_user
103 mkdir
-p etc
/sshkeys etc
/sshcerts etc
/sshactive
104 for ruser
in $reserved_users; do
105 touch etc
/sshkeys
/$ruser
107 chgrp
$cfg_owning_group etc etc
/sshkeys etc
/sshcerts etc
/sshactive ||
108 echo "WARNING: Cannot chgrp $cfg_owning_group the etc directories"
109 chgrp
$cfg_owning_group etc
/passwd ||
110 echo "WARNING: Cannot chgrp $cfg_owning_group $cfg_chroot/etc/passwd"
111 chgrp
$cfg_owning_group etc
/group ||
112 echo "WARNING: Cannot chgrp $cfg_owning_group $cfg_chroot/etc/group"
113 chmod g
+s etc etc
/sshkeys etc
/sshcerts etc
/sshactive ||
114 echo "WARNING: Cannot chmod g+s the etc directories"
115 chmod g
+w etc etc
/sshkeys etc
/sshcerts etc
/sshactive ||
116 echo "WARNING: Cannot chmod g+w the etc directories"
117 chmod g
+w etc
/passwd etc
/group ||
118 echo "WARNING: Cannot chmod g+w the etc/passwd and/or etc/group files"
119 chmod -R g
+w etc
/sshkeys etc
/sshcerts etc
/sshactive
2>/dev
/null ||
120 echo "WARNING: Cannot chmod g+w the sshkeys, sshcerts and/or sshactive files"
122 [ -z "$dbonly" ] ||
exit 0
124 # Make sure the system type is supported for chroot
125 sysname
="$(uname -s | tr A-Z a-z || :)"
128 # These equivalents may need to be expanded at some point
140 chrootsetup
="$curdir/chrootsetup_$sysname.sh"
141 if ! [ -r "$chrootsetup" -a -s "$chrootsetup" ]; then
142 echo "*** Error: $chrootsetup not found"
143 echo "*** Error: creating a chroot for a `uname -s` system is not supported"
147 # Set the user and group on the top of the chroot before creating anything else
148 chown
0:0 "$cfg_chroot"
150 # First, setup basic platform-independent directory structure
151 mkdir
-p bin dev etc lib sbin var
/empty var
/run
${cfg_jailreporoot#/}
156 # Now source the platform-specific script that is responsible for dev device
157 # setup, proc setup (if needed), lib64 setup (if needed) and basic library
158 # installation to make a chroot operational. Additionally it will define a
159 # pull_in_bin function that can be used to add executables and their library
160 # dependencies to the chroot and finally will install a suitable nc.openbsd
161 # compatible version of netcat that supports connections to unix sockets.
164 # Now, bring in sshd, sh etc.
165 # The $chrootsetup script should have already provided a suitable nc.openbsd
166 install -p "$cfg_basedir/bin/git-shell-verify" bin
167 pull_in_bin
"$cfg_basedir/bin/can_user_push" bin
168 pull_in_bin
/bin
/sh bin
169 pull_in_bin
/bin
/date bin
170 pull_in_bin
/bin
/mv bin
171 pull_in_bin
/bin
/rm bin
172 pull_in_bin
/usr
/sbin
/sshd sbin
174 # ...and the bits of git we need,
175 # being sure to use the configured git and its --exec-path to find the pieces
176 git_exec_path
="$("$cfg_git_bin" --exec-path)"
177 for i
in git git-index-pack git-receive-pack git-shell git-update-server-info git-upload-archive \
178 git-upload-pack git-unpack-objects git-show-ref git-config git-for-each-ref git-rev-list
; do
179 pull_in_bin
"$git_exec_path/$i" bin git
182 # Update permissions on the database files
183 chown
$cfg_cgi_user:$cfg_owning_group etc etc
/passwd etc
/group
184 chown
-R $cfg_cgi_user:$cfg_owning_group etc
/sshkeys etc
/sshcerts etc
/sshactive
186 # Set up basic sshd configuration:
187 if [ -n "$nosshdir" ]; then
190 [ ! -f /etc
/moduli
] ||
{ cp -p /etc
/moduli etc
/; chown
0:0 etc
/moduli
; }
192 [ ! -e etc
/ssh -o -d etc
/ssh ] ||
rm -rf etc
/ssh
194 [ ! -f /etc
/ssh
/moduli
] ||
{ cp -p /etc
/ssh
/moduli etc
/ssh
/; chown
0:0 etc
/ssh
/moduli
; }
196 mkdir
-p var
/run
/sshd
197 if [ ! -s etc
/ssh
/sshd_config
]; then
198 cat >etc
/ssh
/sshd_config
<<EOT
200 Port $cfg_sshd_jail_port
203 AllowAgentForwarding no
204 AllowTcpForwarding no
206 IgnoreUserKnownHosts yes
211 UsePrivilegeSeparation yes
213 HostKey /etc/ssh/ssh_host_rsa_key
215 if [ -z "$cfg_disable_dsa" ]; then
216 cat >>etc
/ssh
/sshd_config
<<EOT
217 HostKey /etc/ssh/ssh_host_dsa_key
220 cat >>etc
/ssh
/sshd_config
<<EOT
221 AuthorizedKeysFile /etc/sshkeys/%u
225 PermitEmptyPasswords yes
226 ChallengeResponseAuthentication no
227 PasswordAuthentication yes
230 if [ ! -s etc
/ssh
/ssh_host_rsa_key
]; then
232 if [ "$cfg_rsakeylength" -gt "$bits" ] 2>/dev
/null
; then
233 bits
="$cfg_rsakeylength"
235 yes | ssh-keygen
-b "$bits" -t rsa
-N "" -C Girocco
-f etc
/ssh
/ssh_host_rsa_key
237 if [ -z "$cfg_disable_dsa" -a ! -s etc
/ssh
/ssh_host_dsa_key
]; then
238 # ssh-keygen can only create 1024 bit DSA keys
239 yes | ssh-keygen
-b 1024 -t dsa
-N "" -C Girocco
-f etc
/ssh
/ssh_host_dsa_key
242 # Set the final permissions on the binaries and perform any final twiddling
243 chroot_update_permissions
245 # Change the owner of the sshd-related files
246 chown
0:0 etc
/ssh
/ssh_
* etc
/ssh
/sshd_
*
248 echo "--- Add to your boot scripts: mount --bind $cfg_reporoot $cfg_chroot/$cfg_jailreporoot"
249 echo "--- Add to your boot scripts: mount --bind /proc $cfg_chroot/proc"
250 echo "--- Add to your syslog configuration: listening on socket $cfg_chroot/dev/log"
251 echo "--- To restart a running jail's sshd: sudo kill -HUP \`cat $cfg_chroot/var/run/sshd.pid\`"