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# $OpenBSD: cert-userkey.sh,v 1.3 2010/03/04 10:38:23 djm Exp $
# Placed in the Public Domain.
tid="certified user keys"
rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/cert_user_key*
cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
# Create a CA key
${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_ca_key ||\
fail "ssh-keygen of user_ca_key failed"
# Generate and sign user keys
for ktype in rsa dsa ; do
verbose "$tid: sign user ${ktype} cert"
${SSHKEYGEN} -q -N '' -t ${ktype} \
-f $OBJ/cert_user_key_${ktype} || \
fail "ssh-keygen of cert_user_key_${ktype} failed"
${SSHKEYGEN} -q -s $OBJ/user_ca_key -I \
"regress user key for $USER" \
-n $USER $OBJ/cert_user_key_${ktype} ||
fail "couldn't sign cert_user_key_${ktype}"
done
basic_tests() {
auth=$1
if test "x$auth" = "xauthorized_keys" ; then
# Add CA to authorized_keys
(
echon 'cert-authority '
cat $OBJ/user_ca_key.pub
) > $OBJ/authorized_keys_$USER
else
echo > $OBJ/authorized_keys_$USER
extra_sshd="TrustedUserCAKeys $OBJ/user_ca_key.pub"
fi
for ktype in rsa dsa ; do
for privsep in yes no ; do
_prefix="${ktype} privsep $privsep $auth"
# Simple connect
verbose "$tid: ${_prefix} connect"
(
cat $OBJ/sshd_proxy_bak
echo "UsePrivilegeSeparation $privsep"
echo "$extra_sshd"
) > $OBJ/sshd_proxy
${SSH} -2i $OBJ/cert_user_key_${ktype} \
-F $OBJ/ssh_proxy somehost true
if [ $? -ne 0 ]; then
fail "ssh cert connect failed"
fi
# Revoked keys
verbose "$tid: ${_prefix} revoked key"
(
cat $OBJ/sshd_proxy_bak
echo "UsePrivilegeSeparation $privsep"
echo "RevokedKeys $OBJ/cert_user_key_${ktype}.pub"
echo "$extra_sshd"
) > $OBJ/sshd_proxy
${SSH} -2i $OBJ/cert_user_key_${ktype} \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpecedly"
fi
done
# Revoked CA
verbose "$tid: ${ktype} $auth revoked CA key"
(
cat $OBJ/sshd_proxy_bak
echo "RevokedKeys $OBJ/user_ca_key.pub"
echo "$extra_sshd"
) > $OBJ/sshd_proxy
${SSH} -2i $OBJ/cert_user_key_${ktype} -F $OBJ/ssh_proxy \
somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpecedly"
fi
done
verbose "$tid: $auth CA does not authenticate"
(
cat $OBJ/sshd_proxy_bak
echo "$extra_sshd"
) > $OBJ/sshd_proxy
verbose "$tid: ensure CA key does not authenticate user"
${SSH} -2i $OBJ/user_ca_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect with CA key succeeded unexpectedly"
fi
}
basic_tests authorized_keys
basic_tests TrustedUserCAKeys
test_one() {
ident=$1
result=$2
sign_opts=$3
auth_choice=$4
if test "x$auth_choice" = "x" ; then
auth_choice="authorized_keys TrustedUserCAKeys"
fi
for auth in $auth_choice ; do
cat $OBJ/sshd_proxy_bak > $OBJ/sshd_proxy
if test "x$auth" = "xauthorized_keys" ; then
# Add CA to authorized_keys
(
echon 'cert-authority '
cat $OBJ/user_ca_key.pub
) > $OBJ/authorized_keys_$USER
else
echo > $OBJ/authorized_keys_$USER
echo "TrustedUserCAKeys $OBJ/user_ca_key.pub" >> \
$OBJ/sshd_proxy
fi
verbose "$tid: $ident auth $auth expect $result"
${SSHKEYGEN} -q -s $OBJ/user_ca_key \
-I "regress user key for $USER" \
$sign_opts \
$OBJ/cert_user_key_rsa ||
fail "couldn't sign cert_user_key_rsa"
${SSH} -2i $OBJ/cert_user_key_rsa -F $OBJ/ssh_proxy \
somehost true >/dev/null 2>&1
rc=$?
if [ "x$result" = "xsuccess" ] ; then
if [ $rc -ne 0 ]; then
fail "$ident failed unexpectedly"
fi
else
if [ $rc -eq 0 ]; then
fail "$ident succeeded unexpectedly"
fi
fi
done
}
test_one "correct principal" success "-n ${USER}"
test_one "host-certificate" failure "-n ${USER} -h"
test_one "wrong principals" failure "-n foo"
test_one "cert not yet valid" failure "-n ${USER} -V20200101:20300101"
test_one "cert expired" failure "-n ${USER} -V19800101:19900101"
test_one "cert valid interval" success "-n ${USER} -V-1w:+2w"
test_one "wrong source-address" failure "-n ${USER} -Osource-address=10.0.0.0/8"
test_one "force-command" failure "-n ${USER} -Oforce-command=false"
# Behaviour is different here: TrustedUserCAKeys doesn't allow empty principals
test_one "empty principals" success "" authorized_keys
test_one "empty principals" failure "" TrustedUserCAKeys
# Wrong certificate
for ktype in rsa dsa ; do
# Self-sign
${SSHKEYGEN} -q -s $OBJ/cert_user_key_${ktype} -I \
"regress user key for $USER" \
-n $USER $OBJ/cert_user_key_${ktype} ||
fail "couldn't sign cert_user_key_${ktype}"
verbose "$tid: user ${ktype} connect wrong cert"
${SSH} -2i $OBJ/cert_user_key_${ktype} -F $OBJ/ssh_proxy \
somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect $ident succeeded unexpectedly"
fi
done
rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/cert_user_key*
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