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"
19 # find_std_utility should always come up with the full path to the standard
20 # version of the utility whose name is passed as "$1"
21 getconf
="/usr/bin/getconf"
22 [ -x "$getconf" ] || getconf
="/bin/getconf"
23 [ -x "$getconf" ] || getconf
="getconf"
24 stdpath
="$("unset" -f command; "command" "$getconf" "PATH
" 2>/dev/null)" ||
:
25 ":" "${stdpath:=/bin:/usr/bin}"
26 stdpath
="$stdpath:/sbin:/usr/sbin"
28 "unset" -f unalias command "$1" >/dev
/null
2>&1 ||
:
29 "unalias" -a >/dev
/null
2>&1 ||
:
30 PATH
="$stdpath" && "export" PATH ||
:
35 [ "$1" != "dbonly" ] || dbonly
=1
37 reserved_users
="root sshd _sshd mob git lock bundle nobody everyone $cfg_cgi_user $cfg_mirror_user"
39 # Require either sshd or _sshd user unless "dbonly"
41 if ! "$getent" passwd sshd
>/dev
/null
&& ! "$getent" passwd _sshd
>/dev
/null
; then
42 if [ -n "$dbonly" ]; then
43 if ! [ -s etc
/passwd
]; then
44 # Only complain on initial etc/passwd creation
45 echo "WARNING: no sshd or _sshd user, omitting entries from chroot etc/passwd"
49 echo "*** Error: You do not have required sshd or _sshd user in system." >&2
53 "$getent" passwd sshd
>/dev
/null || sshd_user
=_sshd
56 # Verify we have all we need
57 if ! "$getent" passwd
"$cfg_mirror_user" >/dev
/null
; then
58 echo "*** Error: You do not have \"$cfg_mirror_user\" user in system yet." >&2
61 if ! "$getent" passwd
"$cfg_cgi_user" >/dev
/null
; then
62 echo "*** Error: You do not have \"$cfg_cgi_user\" user in system yet." >&2
65 if [ -n "$dbonly" ] && [ -z "$cfg_owning_group" ]; then
66 cfg_owning_group
="$("$getent" passwd "$cfg_mirror_user" | cut -d : -f 4)"
67 elif ! "$getent" group
"$cfg_owning_group" >/dev
/null
; then
68 echo "*** Error: You do not have \"$cfg_owning_group\" group in system yet." >&2
72 # One last paranoid check before we go writing all over everything
73 if [ -z "$cfg_chroot" ] ||
[ "$cfg_chroot" = "/" ]; then
74 echo "*** Error: chroot location is not set or is invalid." >&2
75 echo "*** Error: perhaps you have an incorrect Config.pm?" >&2
80 mkdir
-p "$cfg_chroot"
82 chmod 755 "$cfg_chroot" ||
83 echo "WARNING: Cannot chmod $cfg_chroot"
86 chmod 0555 var
/empty ||
87 echo "WARNING: Cannot chmod a=rx $cfg_chroot/var/empty"
89 # Set up basic user/group configuration; if there isn't any already
91 [ -n "$cfg_mob" ] || mobpass
='x'
93 if ! [ -s etc
/passwd
]; then
95 root:x:0:0:system administrator:/var/empty:/bin/false
96 nobody:x:$("$getent" passwd nobody | cut -d : -f 3-4):unprivileged user:/var/empty:/bin/false
98 [ -z "$sshd_user" ] ||
cat >>etc
/passwd
<<EOT
99 sshd:x:$("$getent" passwd $sshd_user | cut -d : -f 3-4):privilege separation:/var/empty:/bin/false
100 _sshd:x:$("$getent" passwd $sshd_user | cut -d : -f 3-4):privilege separation:/var/empty:/bin/false
102 [ "$cfg_cgi_user" = "$cfg_mirror_user" ] ||
cat >>etc
/passwd
<<EOT
103 $cfg_cgi_user:x:$("$getent" passwd "$cfg_cgi_user" | cut -d : -f 3-5):/:/bin/true
105 cat >>etc
/passwd
<<EOT
106 $cfg_mirror_user:x:$("$getent" passwd "$cfg_mirror_user" | cut -d : -f 3-5):/:/bin/true
107 everyone:x:65537:$("$getent" group "$cfg_owning_group" | cut -d : -f 3):every user:/:/bin/false
108 mob:$mobpass:65538:$("$getent" group "$cfg_owning_group" | cut -d : -f 3):the mob:/:/bin/git-shell-verify
109 git::65539:$("$getent" passwd nobody | cut -d : -f 4):read-only access:/:/bin/git-shell-verify
111 elif [ -z "$dbonly" ]; then
112 # Make sure an sshd entry is present
113 if ! grep -q '^sshd:' etc
/passwd
; then
114 echo "*** Error: chroot etc/passwd exists but lacks sshd entry." >&2
119 if ! [ -s etc
/group
]; then
121 _repo:x:$("$getent" group "$cfg_owning_group" | cut -d : -f 3):$cfg_mirror_user
125 # Set up basic default Git configuration
126 # Initialize one if none exists or update critical variables for an existing one
129 if [ -e etc
/girocco
/.gitconfig
] && ! [ -f etc
/girocco
/.gitconfig
]; then
130 echo "*** Error: chroot etc/girocco/.gitconfig exists but is not a file." >&2
133 if [ -f etc
/girocco
/.gitconfig
]; then
135 x
="$(git config --file etc/girocco/.gitconfig --get "no--such--section.no such subsection.no--such--key
")" || gcerr
=$?
136 if [ $gcerr -gt 1 ]; then
137 echo "*** Error: chroot etc/girocco/.gitconfig exists but is corrupt." >&2
138 echo "*** Error: either remove it or edit it to correct the problem." >&2
142 if ! [ -s etc
/girocco
/.gitconfig
]; then
143 chmod u
+w etc
/girocco
145 cat >etc
/girocco
/.gitconfig
<<EOT
146 # Any values set here will take effect whenever Girocco runs a git command
150 # $1 => name, $2 => value, $3 => overwrite_flag
151 update_config_item
() {
154 _oldval
="$(git config --file etc/girocco/.gitconfig --get "$1")" || _existsnot
=1
155 if [ -z "$_existsnot" ]; then
156 [ -n "$3" ] ||
return 0
157 [ "$_oldval" != "$2" ] ||
return 0
159 [ -n "$didchmod" ] ||
{ chmod u
+w etc
/girocco
; didchmod
=1; }
160 git config
--file etc
/girocco
/.gitconfig
"$1" "$2"
161 if [ -n "$_existsnot" ]; then
162 echo "chroot: etc/girocco/.gitconfig: config $1: (created) \"$2\""
164 echo "chroot: etc/girocco/.gitconfig: config $1: \"$_oldval\" -> \"$2\""
167 if [ -n "$cfg_git_no_mmap" ]; then
168 update_config_item core.packedGitWindowSize
1m
1
170 update_config_item core.packedGitWindowSize
32m
1
172 if [ -n "$var_window_memory" ]; then
173 update_config_item pack.windowMemory
"$var_window_memory" 1
175 if [ -n "$cfg_jgit_compatible_bitmaps" ]; then
176 update_config_item pack.writeBitmapHashCache false
1
178 update_config_item pack.writeBitmapHashCache true
1
180 update_config_item core.pager
"cat" 1
181 update_config_item core.compression
5
182 update_config_item http.lowSpeedLimit
1
183 update_config_item http.lowSpeedTime
600
184 update_config_item receive.maxInputSize
"${cfg_max_receive_size:-0}" 1
185 [ -z "$didchmod" ] ||
chmod a-w etc
/girocco
187 mkdir
-p etc
/sshkeys etc
/sshcerts etc
/sshactive
188 for ruser
in $reserved_users; do
189 touch etc
/sshkeys
/$ruser
191 chgrp
$cfg_owning_group etc etc
/sshkeys etc
/sshcerts etc
/sshactive ||
192 echo "WARNING: Cannot chgrp $cfg_owning_group the etc directories"
193 chgrp
$cfg_owning_group etc
/passwd ||
194 echo "WARNING: Cannot chgrp $cfg_owning_group $cfg_chroot/etc/passwd"
195 chgrp
$cfg_owning_group etc
/group ||
196 echo "WARNING: Cannot chgrp $cfg_owning_group $cfg_chroot/etc/group"
197 chgrp
$cfg_owning_group etc
/girocco etc
/girocco
/.gitconfig ||
198 echo "WARNING: Cannot chgrp $cfg_owning_group $cfg_chroot/etc/girocco"
199 chmod g
+s etc etc
/sshkeys etc
/sshcerts etc
/sshactive ||
200 echo "WARNING: Cannot chmod g+s the etc directories"
201 chmod g
+w etc etc
/sshkeys etc
/sshcerts etc
/sshactive ||
202 echo "WARNING: Cannot chmod g+w the etc directories"
203 chmod g
+w etc
/passwd etc
/group ||
204 echo "WARNING: Cannot chmod g+w the etc/passwd and/or etc/group files"
205 chmod go-w etc
/passwd etc
/girocco etc
/girocco
/.gitconfig ||
206 echo "WARNING: Cannot chmod go-w etc/girocco and/or etc/girocco/.gitconfig"
207 chmod a-w etc
/girocco ||
208 echo "WARNING: Cannot chmod a-w etc/girocco"
209 chmod -R g
+w etc
/sshkeys etc
/sshcerts etc
/sshactive
2>/dev
/null ||
210 echo "WARNING: Cannot chmod g+w the sshkeys, sshcerts and/or sshactive files"
212 # Note time of last install
213 >etc
/sshactive
/_install
215 [ -z "$dbonly" ] ||
exit 0
217 # Make sure the system type is supported for chroot
218 sysname
="$(uname -s | tr A-Z a-z)" ||
:
221 # These equivalents may need to be expanded at some point
235 chrootsetup
="$curdir/chrootsetup_$sysname.sh"
236 if ! [ -f "$chrootsetup" ] ||
! [ -r "$chrootsetup" ] ||
! [ -s "$chrootsetup" ]; then
237 echo "*** Error: $chrootsetup not found" >&2
238 echo "*** Error: creating a chroot for a $(uname -s) system is not supported" >&2
242 # validate reporoot, chroot, jailreporoot and sshd_bin before doing anything more
244 # validates the passed in dir if a second argument is not empty dir must NOT
245 # start with / otherwise it must. A trailing '/' is removed and any duplicated
246 # // are removed and a sole / or empty is disallowed.
248 _check
="$(echo "$1" | tr -s /)"
250 [ -n "$_check" ] && [ "$_check" != "/" ] ||
return 1
252 # must start with '/'
253 case "$_check" in /*) :;; *) return 1; esac
255 # must NOT start with '/'
256 case "$_check" in /*) return 1; esac
261 if ! reporoot
="$(make_valid_dir "$cfg_reporoot")"; then
262 echo "*** Error: invalid Config::reporoot: $cfg_reporoot" >&2
263 echo "*** Error: MUST start with '/' and MUST NOT be '/'" >&2
266 if ! chroot
="$(make_valid_dir "$cfg_chroot")"; then
267 echo "*** Error: invalid Config::chroot: $cfg_chroot" >&2
268 echo "*** Error: MUST start with '/' and MUST NOT be '/'" >&2
271 if ! jailreporoot
="$(make_valid_dir "$cfg_jailreporoot" 1)"; then
272 echo "*** Error: invalid Config::jailreporoot: $cfg_jailreporoot" >&2
273 echo "*** Error: MUST NOT start with '/' and MUST NOT be ''" >&2
277 # chroot MUST NOT be reporoot
278 if [ "$chroot" = "$reporoot" ]; then
279 echo "*** Error: invalid Config::reporoot: $cfg_reporoot" >&2
280 echo "*** Error: invalid Config::chroot: $cfg_chroot" >&2
281 echo "*** Error: reporoot and chroot MUST NOT be the same" >&2
285 # chroot MUST NOT be a subdirectory of reporoot
286 case "$chroot" in "$reporoot"/*)
287 echo "*** Error: invalid Config::reporoot: $cfg_reporoot" >&2
288 echo "*** Error: invalid Config::chroot: $cfg_chroot" >&2
289 echo "*** Error: chroot MUST NOT be a subdirectory of reporoot" >&2
293 # chroot/jailreporoot MUST NOT be a subdirectory of reporoot
294 case "$chroot/$jailreporoot" in "$reporoot"/*)
295 echo "*** Error: invalid Config::reporoot: $cfg_reporoot" >&2
296 echo "*** Error: invalid Config::chroot: $cfg_chroot" >&2
297 echo "*** Error: invalid Config::jailreporoot: $cfg_jailreporoot" >&2
298 echo "*** Error: chroot/jailreporoot MUST NOT be a subdirectory of reporoot" >&2
302 # reporoot MUST NOT be a subdirectory of chroot/jailreporoot
303 case "$reporoot" in "$chroot/$jailreporoot"/*)
304 echo "*** Error: invalid Config::reporoot: $cfg_reporoot" >&2
305 echo "*** Error: invalid Config::chroot: $cfg_chroot" >&2
306 echo "*** Error: invalid Config::jailreporoot: $cfg_jailreporoot" >&2
307 echo "*** Error: reporoot MUST NOT be a subdirectory of chroot/jailreporoot" >&2
311 # sshd_bin MUST be undef (or empty) or a full absolute path
313 case "$cfg_sshd_bin" in *"/../"*) sshd_bin_bad
=1;; ""|
/?
*) :;; *) sshd_bin_bad
=1;; esac
314 [ -z "$sshd_bin_bad" ] ||
{
315 echo "*** Error: invalid Config::sshd_bin $cfg_sshd_bin" >&2
316 echo "*** Error: if set, sshd_bin must be an absolute path" >&2
319 sshd_bin
="$cfg_sshd_bin"
320 [ -n "$sshd_bin" ] || sshd_bin
="$(find_std_utility "sshd
")" ||
{
321 echo "*** Error: Config::sshd_bin is not set and no sshd could be found" >&2
322 echo "*** Error: please set Config::sshd_bin to an absolute path to sshd" >&2
325 [ -x "$sshd_bin" ] && [ -r "$sshd_bin" ] && [ -f "$sshd_bin" ] ||
{
326 echo "*** Error: the selected sshd ('$sshd_bin') was not found, not readable or not executable" >&2
330 # Set the user and group on the top of the chroot before creating anything else
333 # When we create a fork, the alternates always have an absolute path.
334 # If reporoot is not --bind mounted at the same location in chroot we must
335 # create a suitable symlink so the absolute path alternates continue to work
336 # in the ssh chroot or else forks will be broken in there.
337 if [ "$reporoot" != "/$jailreporoot" ]; then
338 mkdirp
="$(dirname "${reporoot#/}")"
339 [ "$mkdirp" = "." ] && mkdirp
=
341 [ -z "$mkdirp" ] || lnback
="$(echo "$mkdirp/" | sed -e 's,[^/]*/,../,g')"
342 [ -z "$mkdirp" ] || mkdir
-p "$chroot/$mkdirp"
343 (umask 0; ln -s -f -n "$lnback$jailreporoot" "$chroot$reporoot")
344 [ $?
-eq 0 ] ||
exit 1
347 # First, setup basic platform-independent directory structure
348 mkdir
-p bin dev etc lib sbin var
/empty var
/run
"$jailreporoot"
354 # Now source the platform-specific script that is responsible for dev device
355 # setup, proc setup (if needed), lib64 setup (if needed) and basic library
356 # installation to make a chroot operational. Additionally it will define a
357 # pull_in_bin function that can be used to add executables and their library
358 # dependencies to the chroot and finally will install a suitable nc.openbsd
359 # compatible version of netcat that supports connections to unix sockets.
362 # Now, bring in sshd, sh etc.
363 # The $chrootsetup script should have already provided a suitable nc.openbsd
364 install -p "$cfg_basedir/bin/git-shell-verify" bin
/git-shell-verify.new
365 install -p "$cfg_basedir/bin/git-askpass-password" bin
/git-askpass-password.new
367 -e 's|^#!.*|#!/bin/sh| if $. == 1;' \
368 -e 'close ARGV if eof;' \
369 bin
/git-shell-verify.new bin
/git-askpass-password.new
370 mv -f bin
/git-askpass-password.new bin
/git-askpass-password
371 mv -f bin
/git-shell-verify.new bin
/git-shell-verify
372 pull_in_bin
"$cfg_basedir/bin/can_user_push" bin
373 pull_in_bin
"$cfg_basedir/bin/list_packs" bin
374 pull_in_bin
"$var_sh_bin" bin
/sh
375 # be paranoid since these are going into the chroot and make sure
376 # that we get the "standard" versions of them (they are all standard "POSIX"
377 # utilities) not some wayward version picked up by a haphazard PATH
378 pull_in_bin
"$(find_std_utility cat )" bin
379 pull_in_bin
"$(find_std_utility chmod )" bin
380 pull_in_bin
"$(find_std_utility date )" bin
381 pull_in_bin
"$(find_std_utility find )" bin
382 pull_in_bin
"$(find_std_utility mkdir )" bin
383 pull_in_bin
"$(find_std_utility mv )" bin
384 pull_in_bin
"$(find_std_utility rm )" bin
385 pull_in_bin
"$(find_std_utility sleep )" bin
386 pull_in_bin
"$(find_std_utility touch )" bin
387 pull_in_bin
"$(find_std_utility tr )" bin
388 pull_in_bin
"$(find_std_utility wc )" bin
389 # this one's already been validated and might be in a non-standard location
390 pull_in_bin
"$sshd_bin" sbin
392 # ...and the bits of git we need,
393 # being sure to use the configured git and its --exec-path to find the pieces
394 for i
in git git-index-pack git-receive-pack git-shell git-update-server-info \
395 git-upload-archive git-upload-pack git-unpack-objects git-config \
396 git-for-each-ref git-rev-list git-rev-parse git-symbolic-ref
; do
397 pull_in_bin
"$var_git_exec_path/$i" bin git
400 # ...and any extras identified by install.sh
401 # these are also all standard "POSIX" utilities
402 # ones that a decent sh implementation would have built-in already...
403 if [ -n "$GIROCCO_CHROOT_EXTRA_INSTALLS" ]; then
404 for i
in $GIROCCO_CHROOT_EXTRA_INSTALLS; do
405 pull_in_bin
"$(find_std_utility "$
(basename "$i")")" bin
409 # Note time of last jailsetup
410 >etc
/sshactive
/_jailsetup
412 # Update permissions on the database files
413 chown
$cfg_cgi_user:$cfg_owning_group etc
/passwd etc
/group
414 chown
-R $cfg_cgi_user:$cfg_owning_group etc
/sshkeys etc
/sshcerts etc
/sshactive
415 chown
$cfg_mirror_user:$cfg_owning_group etc etc
/girocco etc
/girocco
/.gitconfig
417 # Set up basic sshd configuration:
418 if [ -n "$nosshdir" ]; then
421 ! [ -f /etc
/moduli
] ||
{ cp -p /etc
/moduli etc
/; chown
0:0 etc
/moduli
; }
423 ! [ -e etc
/ssh ] ||
[ -d etc
/ssh ] ||
rm -rf etc
/ssh
425 ! [ -f /etc
/ssh
/moduli
] ||
{ cp -p /etc
/ssh
/moduli etc
/ssh
/; chown
0:0 etc
/ssh
/moduli
; }
427 mkdir
-p var
/run
/sshd
428 if ! [ -s etc
/ssh
/sshd_config
]; then
429 cat >etc
/ssh
/sshd_config
<<EOT
431 Port $cfg_sshd_jail_port
434 AllowAgentForwarding no
435 AllowTcpForwarding no
437 IgnoreUserKnownHosts yes
442 UsePrivilegeSeparation yes
444 HostKey /etc/ssh/ssh_host_rsa_key
446 if [ -z "$cfg_disable_dsa" ]; then
447 cat >>etc
/ssh
/sshd_config
<<EOT
448 HostKey /etc/ssh/ssh_host_dsa_key
451 cat >>etc
/ssh
/sshd_config
<<EOT
452 AuthorizedKeysFile /etc/sshkeys/%u
456 PermitEmptyPasswords yes
457 ChallengeResponseAuthentication no
458 PasswordAuthentication yes
461 if ! [ -s etc
/ssh
/ssh_host_rsa_key
]; then
463 if [ "$cfg_rsakeylength" -gt "$bits" ] 2>/dev
/null
; then
464 bits
="$cfg_rsakeylength"
466 yes | ssh-keygen
-b "$bits" -t rsa
-N "" -C Girocco
-f etc
/ssh
/ssh_host_rsa_key
468 if [ -z "$cfg_disable_dsa" ] && ! [ -s etc
/ssh
/ssh_host_dsa_key
]; then
469 # ssh-keygen can only create 1024 bit DSA keys
470 yes | ssh-keygen
-b 1024 -t dsa
-N "" -C Girocco
-f etc
/ssh
/ssh_host_dsa_key
473 # Set the final permissions on the binaries and perform any final twiddling
474 chroot_update_permissions
476 # Change the owner of the sshd-related files
477 chown
0:0 etc
/ssh
/ssh_
* etc
/ssh
/sshd_
*
479 echo "--- Add to your boot scripts: mount --bind $reporoot $chroot/$jailreporoot"
480 echo "--- Add to your boot scripts: mount --bind /proc $chroot/proc"
481 echo "--- Add to your syslog configuration: listening on socket $chroot/dev/log"
482 echo "--- To restart a running jail's sshd: sudo kill -HUP \$(cat $chroot/var/run/sshd.pid)"