/usr/share/doc/rssh/examples/mkchroot.sh is in rssh 2.3.3-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 | #!/bin/bash
#####################################################################
#####################################################################
##
## mkchroot.sh - set up a chroot jail.
##
## This script is written to work for Red Hat 8/9 systems and adapted to work
## on Debian systems, but may work on other systems. Or, it may not... In
## fact, it may not work at all. Use at your own risk. :)
##
fail() {
echo "`basename $0`: fatal error" >&2
echo "$1" >&2
exit $2
}
#####################################################################
#
# Initialize - handle command-line args, and set up variables and such.
#
# $1 is the directory to make the root of the chroot jail (required)
# $2, if given, is the user who should own the jail (optional)
# $3, if given, is the permissions on the directory (optional)
#
if [ -z "$1" ]; then
echo "`basename $0`: error parsing command line" >&2
echo " You must specify a directory to use as the chroot jail." >&2
exit 1
fi
jail_dir="$1"
if [ -n "$2" ]; then
owner="$2"
fi
if [ -n "$3" ]; then
perms="$3"
fi
#####################################################################
#
# build the jail
#
# now make the directory
if [ ! -d "$jail_dir" ]; then
echo "Creating root jail directory."
mkdir -p "$jail_dir"
if [ $? -ne 0 ]; then
echo " `basename $0`: error creating jail directory." >&2
echo "Check permissions on parent directory." >&2
exit 2
fi
fi
if [ -n "$owner" -a `whoami` = "root" ]; then
echo "Setting owner of jail."
chown "$owner" "$jail_dir"
if [ $? -ne 0 ]; then
echo " `basename $0`: error changing owner of jail directory." >&2
exit 3
fi
else
echo -e "NOT changing owner of root jail. \c"
if [ `whoami` != "root" ]; then
echo "You are not root."
else
echo
fi
fi
if [ -n "$owner" -a `whoami` = "root" ]; then
echo "Setting permissions of jail."
chmod "$perms" "$jail_dir"
if [ $? -ne 0 ]; then
echo " `basename $0`: error changing perms of jail directory." >&2
exit 3
fi
else
echo -e "NOT changing perms of root jail. \c"
if [ `whoami` != "root" ]; then
echo "You are not root."
else
echo
fi
fi
# copy SSH files
scp_path="/usr/bin/scp"
sftp_server_path="/usr/lib/openssh/sftp-server"
rssh_path="/usr/bin/rssh"
chroot_helper_path="/usr/lib/rssh/rssh_chroot_helper"
for jail_path in `dirname "$jail_dir$scp_path"` `dirname "$jail_dir$sftp_server_path"` `dirname "$jail_dir$chroot_helper_path"`; do
echo "setting up $jail_path"
if [ ! -d "$jail_path" ]; then
mkdir -p "$jail_path" || \
fail "Error creating $jail_path. Exiting." 4
fi
done
cp "$scp_path" "$jail_dir$scp_path" || \
fail "Error copying $scp_path. Exiting." 5
cp "$sftp_server_path" "$jail_dir$sftp_server_path" || \
fail "Error copying $sftp_server_path. Exiting." 5
cp "$rssh_path" "$jail_dir$rssh_path" || \
fail "Error copying $rssh_path. Exiting." 5
cp "$chroot_helper_path" "$jail_dir$chroot_helper_path" || \
fail "Error copying $chroot_helper_path. Exiting." 5
#####################################################################
#
# identify and copy libraries needed in the jail
#
# Sample ldd output:
#
# linux-gate.so.1 => (0xffffe000)
# libresolv.so.2 => /lib/i686/cmov/libresolv.so.2 (0xb7ef2000)
# libcrypto.so.0.9.8 => /usr/lib/i686/cmov/libcrypto.so.0.9.8 (0xb7da8000)
# libutil.so.1 => /lib/i686/cmov/libutil.so.1 (0xb7da3000)
# libz.so.1 => /usr/lib/libz.so.1 (0xb7d8e000)
# libnsl.so.1 => /lib/i686/cmov/libnsl.so.1 (0xb7d76000)
# libcrypt.so.1 => /lib/i686/cmov/libcrypt.so.1 (0xb7d44000)
# libgssapi_krb5.so.2 => /usr/lib/libgssapi_krb5.so.2 (0xb7d1b000)
# libkrb5.so.3 => /usr/lib/libkrb5.so.3 (0xb7c8d000)
# libk5crypto.so.3 => /usr/lib/libk5crypto.so.3 (0xb7c69000)
# libcom_err.so.2 => /lib/libcom_err.so.2 (0xb7c66000)
# libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb7b19000)
# libdl.so.2 => /lib/i686/cmov/libdl.so.2 (0xb7b15000)
# libkrb5support.so.0 => /usr/lib/libkrb5support.so.0 (0xb7b0d000)
# libkeyutils.so.1 => /lib/libkeyutils.so.1 (0xb7b09000)
# /lib/ld-linux.so.2 (0xb7f13000)
#
# either the first or the third column may contain a path
#
for prog in $scp_path $sftp_server_path $rssh_path $chroot_helper_path \
/lib/libnss_compat* /lib/libnss_files*; do
echo "Copying libraries for $prog."
libs=`ldd $prog | awk '$1 ~ /^\// {print $1} $3 ~ /^\// {print $3}'`
for lib in $libs; do
mkdir -p "$jail_dir$(dirname $lib)" || \
fail "Error creating $(dirname $lib). Exiting" 6
echo -e "\t$lib"
cp "$lib" "$jail_dir$lib" || \
fail "Error copying $lib. Exiting" 6
done
done
echo "copying name service resolution libraries..."
tar -cf - /lib/libnss_compat* /lib/libnss_files* | tar -C "$jail_dir" -xvf - |sed 's/^/\t/'
#####################################################################
#
# copy config files for the dynamic linker, nsswitch.conf, and the passwd file
#
echo "Setting up /etc in the chroot jail"
mkdir -p "$jail_dir/etc" || fail "Error creating /etc. Exiting" 7
cp /etc/nsswitch.conf "$jail_dir/etc/" || \
fail "Error copying /etc/nsswitch.conf. Exiting" 7
cp /etc/passwd "$jail_dir/etc/" || \
fail "Error copying /etc/passwd. Exiting" 7
cp -r /etc/ld.* "$jail_dir/etc/" || \
fail "Error copying /etc/ld.*. Exiting" 7
echo -e "\nWARNING: Copying /etc/passwd into the chroot jail. You may wish"
echo -e "to edit out unnecessary users and remove any sensitive information"
echo -e "from it."
#####################################################################
#
# set up /dev
#
mkdir -p "$jail_dir/dev"
if [ `whoami` = "root" ]; then
cp -a /dev/log "$jail_dir/dev" || \
fail "Error creating /dev/log. Exiting" 8
cp -a /dev/null "$jail_dir/dev" || \
fail "Error creating /dev/null. Exiting" 8
cp -a /dev/zero "$jail_dir/dev" || \
fail "Error creating /dev/zero. Exiting" 8
else
echo -e "NOT creating /dev/null and /dev/log in the chroot jail. \c"
echo -e "You are not root.\n"
fi
echo -e "Chroot jail configuration completed.\n"
echo -e "NOTE: if you are not using the passwd file for authentication,"
echo -e "you may need to copy some of the /lib/libnss_* files into the jail.\n"
echo -e "NOTE: if you are using any programs other than scp and sftp, you will"
echo -e "need to copy the server binaries and any libraries they depend on"
echo -e "into the chroot manually. Use ldd on the binary to find the needed"
echo -e "libraries.\n"
echo -e "NOTE: you must MANUALLY edit your syslog rc script to start syslogd"
echo -e "with appropriate options to log to $jail_dir/dev/log. In most cases,"
echo -e "you will need to start syslog as:\n"
echo -e " /sbin/syslogd -a $jail_dir/dev/log\n\n"
echo -e "NOTE: we make no guarantee that ANY of this will work for you... \c"
echo -e "if it\ndoesn't, you're on your own. Sorry!\n"
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