keys-command.sh revision 295367 
1#	$OpenBSD: keys-command.sh,v 1.3 2015/05/21 06:40:02 djm Exp $
2#	Placed in the Public Domain.
3
4tid="authorized keys from command"
5
6if test -z "$SUDO" ; then
7	echo "skipped (SUDO not set)"
8	echo "need SUDO to create file in /var/run, test won't work without"
9	exit 0
10fi
11
12rm -f $OBJ/keys-command-args
13
14touch $OBJ/keys-command-args
15chmod a+rw $OBJ/keys-command-args
16
17expected_key_text=`awk '{ print $2 }' < $OBJ/rsa.pub`
18expected_key_fp=`$SSHKEYGEN -lf $OBJ/rsa.pub | awk '{ print $2 }'`
19
20# Establish a AuthorizedKeysCommand in /var/run where it will have
21# acceptable directory permissions.
22KEY_COMMAND="/var/run/keycommand_${LOGNAME}"
23cat << _EOF | $SUDO sh -c "rm -f '$KEY_COMMAND' ; cat > '$KEY_COMMAND'"
24#!/bin/sh
25echo args: "\$@" >> $OBJ/keys-command-args
26echo "$PATH" | grep -q mekmitasdigoat && exit 7
27test "x\$1" != "x${LOGNAME}" && exit 1
28if test $# -eq 6 ; then
29	test "x\$2" != "xblah" && exit 2
30	test "x\$3" != "x${expected_key_text}" && exit 3
31	test "x\$4" != "xssh-rsa" && exit 4
32	test "x\$5" != "x${expected_key_fp}" && exit 5
33	test "x\$6" != "xblah" && exit 6
34fi
35exec cat "$OBJ/authorized_keys_${LOGNAME}"
36_EOF
37$SUDO chmod 0755 "$KEY_COMMAND"
38
39if [ -x $KEY_COMMAND ]; then
40	cp $OBJ/sshd_proxy $OBJ/sshd_proxy.bak
41
42	verbose "AuthorizedKeysCommand with arguments"
43	(
44		grep -vi AuthorizedKeysFile $OBJ/sshd_proxy.bak
45		echo AuthorizedKeysFile none
46		echo AuthorizedKeysCommand $KEY_COMMAND %u blah %k %t %f blah
47		echo AuthorizedKeysCommandUser ${LOGNAME}
48	) > $OBJ/sshd_proxy
49
50	# Ensure that $PATH is sanitised in sshd
51	env PATH=$PATH:/sbin/mekmitasdigoat \
52	    ${SSH} -F $OBJ/ssh_proxy somehost true
53	if [ $? -ne 0 ]; then
54		fail "connect failed"
55	fi
56
57	verbose "AuthorizedKeysCommand without arguments"
58	# Check legacy behavior of no-args resulting in username being passed.
59	(
60		grep -vi AuthorizedKeysFile $OBJ/sshd_proxy.bak
61		echo AuthorizedKeysFile none
62		echo AuthorizedKeysCommand $KEY_COMMAND
63		echo AuthorizedKeysCommandUser ${LOGNAME}
64	) > $OBJ/sshd_proxy
65
66	# Ensure that $PATH is sanitised in sshd
67	env PATH=$PATH:/sbin/mekmitasdigoat \
68	    ${SSH} -F $OBJ/ssh_proxy somehost true
69	if [ $? -ne 0 ]; then
70		fail "connect failed"
71	fi
72else
73	echo "SKIPPED: $KEY_COMMAND not executable (/var/run mounted noexec?)"
74fi
75
76$SUDO rm -f $KEY_COMMAND
77