blob: 7d380325bb26238c54f2f9fdf5b5ae41a8319e7b (
plain)
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
|
# $OpenBSD: principals-command.sh,v 1.7 2019/09/06 04:24:06 dtucker Exp $
# Placed in the Public Domain.
tid="authorized principals command"
rm -f $OBJ/user_ca_key* $OBJ/cert_user_key*
cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
if [ -z "$SUDO" -a ! -w /var/run ]; then
echo "skipped (SUDO not set)"
echo "need SUDO to create file in /var/run, test won't work without"
exit 0
fi
case "`${SSH} -Q key-plain`" in
*ssh-rsa*) userkeytype=rsa ;;
*) userkeytype=ed25519 ;;
esac
SERIAL=$$
# Create a CA key and a user certificate.
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_ca_key || \
fatal "ssh-keygen of user_ca_key failed"
${SSHKEYGEN} -q -N '' -t ${userkeytype} -f $OBJ/cert_user_key || \
fatal "ssh-keygen of cert_user_key failed"
${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "Joanne User" \
-z $$ -n ${USER},mekmitasdigoat $OBJ/cert_user_key || \
fatal "couldn't sign cert_user_key"
CERT_BODY=`cat $OBJ/cert_user_key-cert.pub | awk '{ print $2 }'`
CA_BODY=`cat $OBJ/user_ca_key.pub | awk '{ print $2 }'`
CERT_FP=`${SSHKEYGEN} -lf $OBJ/cert_user_key-cert.pub | awk '{ print $2 }'`
CA_FP=`${SSHKEYGEN} -lf $OBJ/user_ca_key.pub | awk '{ print $2 }'`
# Establish a AuthorizedPrincipalsCommand in /var/run where it will have
# acceptable directory permissions.
PRINCIPALS_COMMAND="/var/run/principals_command_${LOGNAME}.$$"
trap "$SUDO rm -f ${PRINCIPALS_COMMAND}" 0
cat << _EOF | $SUDO sh -c "cat > '$PRINCIPALS_COMMAND'"
#!/bin/sh
test "x\$1" != "x${LOGNAME}" && exit 1
test "x\$2" != "xssh-${userkeytype}-cert-v01@openssh.com" && exit 1
test "x\$3" != "xssh-ed25519" && exit 1
test "x\$4" != "xJoanne User" && exit 1
test "x\$5" != "x${SERIAL}" && exit 1
test "x\$6" != "x${CA_FP}" && exit 1
test "x\$7" != "x${CERT_FP}" && exit 1
test "x\$8" != "x${CERT_BODY}" && exit 1
test "x\$9" != "x${CA_BODY}" && exit 1
test -f "$OBJ/authorized_principals_${LOGNAME}" &&
exec cat "$OBJ/authorized_principals_${LOGNAME}"
_EOF
test $? -eq 0 || fatal "couldn't prepare principals command"
$SUDO chmod 0755 "$PRINCIPALS_COMMAND"
if ! $OBJ/check-perm -m keys-command $PRINCIPALS_COMMAND ; then
echo "skipping: $PRINCIPALS_COMMAND is unsuitable as " \
"AuthorizedPrincipalsCommand"
$SUDO rm -f $PRINCIPALS_COMMAND
exit 0
fi
if [ -x $PRINCIPALS_COMMAND ]; then
# Test explicitly-specified principals
for privsep in yes sandbox ; do
_prefix="privsep $privsep"
# Setup for AuthorizedPrincipalsCommand
rm -f $OBJ/authorized_keys_$USER
(
cat $OBJ/sshd_proxy_bak
echo "UsePrivilegeSeparation $privsep"
echo "AuthorizedKeysFile none"
echo "AuthorizedPrincipalsCommand $PRINCIPALS_COMMAND" \
"%u %t %T %i %s %F %f %k %K"
echo "AuthorizedPrincipalsCommandUser ${LOGNAME}"
echo "TrustedUserCAKeys $OBJ/user_ca_key.pub"
) > $OBJ/sshd_proxy
# XXX test missing command
# XXX test failing command
# Empty authorized_principals
verbose "$tid: ${_prefix} empty authorized_principals"
echo > $OBJ/authorized_principals_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# Wrong authorized_principals
verbose "$tid: ${_prefix} wrong authorized_principals"
echo gregorsamsa > $OBJ/authorized_principals_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# Correct authorized_principals
verbose "$tid: ${_prefix} correct authorized_principals"
echo mekmitasdigoat > $OBJ/authorized_principals_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -ne 0 ]; then
fail "ssh cert connect failed"
fi
# authorized_principals with bad key option
verbose "$tid: ${_prefix} authorized_principals bad key opt"
echo 'blah mekmitasdigoat' > $OBJ/authorized_principals_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# authorized_principals with command=false
verbose "$tid: ${_prefix} authorized_principals command=false"
echo 'command="false" mekmitasdigoat' > \
$OBJ/authorized_principals_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# authorized_principals with command=true
verbose "$tid: ${_prefix} authorized_principals command=true"
echo 'command="true" mekmitasdigoat' > \
$OBJ/authorized_principals_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost false >/dev/null 2>&1
if [ $? -ne 0 ]; then
fail "ssh cert connect failed"
fi
# Setup for principals= key option
rm -f $OBJ/authorized_principals_$USER
(
cat $OBJ/sshd_proxy_bak
echo "UsePrivilegeSeparation $privsep"
) > $OBJ/sshd_proxy
# Wrong principals list
verbose "$tid: ${_prefix} wrong principals key option"
(
printf 'cert-authority,principals="gregorsamsa" '
cat $OBJ/user_ca_key.pub
) > $OBJ/authorized_keys_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# Correct principals list
verbose "$tid: ${_prefix} correct principals key option"
(
printf 'cert-authority,principals="mekmitasdigoat" '
cat $OBJ/user_ca_key.pub
) > $OBJ/authorized_keys_$USER
${SSH} -i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -ne 0 ]; then
fail "ssh cert connect failed"
fi
done
else
echo "SKIPPED: $PRINCIPALS_COMMAND not executable " \
"(/var/run mounted noexec?)"
fi
|
