blob: 2de037bd1edb3f8dce59b7652177b44eeed45c93 (
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
|
# $OpenBSD: limit-keytype.sh,v 1.1 2015/01/13 07:49:49 djm Exp $
# Placed in the Public Domain.
tid="restrict pubkey type"
rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/user_key*
rm -f $OBJ/authorized_principals_$USER $OBJ/cert_user_key*
mv $OBJ/sshd_proxy $OBJ/sshd_proxy.orig
mv $OBJ/ssh_proxy $OBJ/ssh_proxy.orig
# Create a CA key
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_ca_key ||\
fatal "ssh-keygen failed"
# Make some keys and a certificate.
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key1 || \
fatal "ssh-keygen failed"
${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key2 || \
fatal "ssh-keygen failed"
${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key3 || \
fatal "ssh-keygen failed"
${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \
-z $$ -n ${USER},mekmitasdigoat $OBJ/user_key3 ||
fatal "couldn't sign user_key1"
# Copy the private key alongside the cert to allow better control of when
# it is offered.
mv $OBJ/user_key3-cert.pub $OBJ/cert_user_key3.pub
cp -p $OBJ/user_key3 $OBJ/cert_user_key3
grep -v IdentityFile $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy
opts="-oProtocol=2 -F $OBJ/ssh_proxy -oIdentitiesOnly=yes"
fullopts="$opts -i $OBJ/cert_user_key3 -i $OBJ/user_key1 -i $OBJ/user_key2"
echo mekmitasdigoat > $OBJ/authorized_principals_$USER
cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER
cat $OBJ/user_key2.pub >> $OBJ/authorized_keys_$USER
prepare_config() {
(
grep -v "Protocol" $OBJ/sshd_proxy.orig
echo "Protocol 2"
echo "AuthenticationMethods publickey"
echo "TrustedUserCAKeys $OBJ/user_ca_key.pub"
echo "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u"
for x in "$@" ; do
echo "$x"
done
) > $OBJ/sshd_proxy
}
prepare_config
# Check we can log in with all key types.
${SSH} $opts -i $OBJ/cert_user_key3 proxy true || fatal "cert failed"
${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed"
# Allow plain Ed25519 and RSA. The certificate should fail.
verbose "privsep=$privsep allow rsa,ed25519"
prepare_config "PubkeyAcceptedKeyTypes ssh-rsa,ssh-ed25519"
${SSH} $opts -i $OBJ/cert_user_key3 proxy true && fatal "cert succeeded"
${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed"
# Allow Ed25519 only.
verbose "privsep=$privsep allow ed25519"
prepare_config "PubkeyAcceptedKeyTypes ssh-ed25519"
${SSH} $opts -i $OBJ/cert_user_key3 proxy true && fatal "cert succeeded"
${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded"
# Allow all certs. Plain keys should fail.
verbose "privsep=$privsep allow cert only"
prepare_config "PubkeyAcceptedKeyTypes ssh-*-cert-v01@openssh.com"
${SSH} $opts -i $OBJ/cert_user_key3 proxy true || fatal "cert failed"
${SSH} $opts -i $OBJ/user_key1 proxy true && fatal "key1 succeeded"
${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded"
|
