1# $OpenBSD: multipubkey.sh,v 1.4 2021/06/07 01:16:34 djm Exp $ 2# Placed in the Public Domain. 3 4tid="multiple pubkey" 5 6rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/user_key* 7rm -f $OBJ/authorized_principals_$USER $OBJ/cert_user_key* 8 9mv $OBJ/sshd_proxy $OBJ/sshd_proxy.orig 10mv $OBJ/ssh_proxy $OBJ/ssh_proxy.orig 11 12# Create a CA key 13${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_ca_key ||\ 14 fatal "ssh-keygen failed" 15 16# Make some keys and a certificate. 17${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key1 || \ 18 fatal "ssh-keygen failed" 19${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key2 || \ 20 fatal "ssh-keygen failed" 21${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \ 22 -z $$ -n ${USER},mekmitasdigoat $OBJ/user_key1 || 23 fail "couldn't sign user_key1" 24# Copy the private key alongside the cert to allow better control of when 25# it is offered. 26mv $OBJ/user_key1-cert.pub $OBJ/cert_user_key1.pub 27cp -p $OBJ/user_key1 $OBJ/cert_user_key1 28 29grep -v IdentityFile $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy 30 31opts="-oProtocol=2 -F $OBJ/ssh_proxy -oIdentitiesOnly=yes" 32opts="$opts -i $OBJ/cert_user_key1 -i $OBJ/user_key1 -i $OBJ/user_key2" 33 34for match in no yes ; do 35 ( 36 cat $OBJ/sshd_proxy.orig 37 echo "Protocol 2" 38 echo "TrustedUserCAKeys $OBJ/user_ca_key.pub" 39 echo "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u" 40 ) > $OBJ/sshd_proxy 41 if test "$match" = "yes" ; then 42 echo "AuthenticationMethods none" >> $OBJ/sshd_proxy 43 echo "PubkeyAuthentication no" >> $OBJ/sshd_proxy 44 echo "Match all" >> $OBJ/sshd_proxy 45 echo "PubkeyAuthentication yes" >> $OBJ/sshd_proxy 46 fi 47 echo "AuthenticationMethods publickey,publickey" >> $OBJ/sshd_proxy 48 49 # Single key should fail. 50 trace "match $match single key" 51 rm -f $OBJ/authorized_principals_$USER 52 cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER 53 ${SSH} $opts proxy true && fail "ssh succeeded with key" 54 55 # Single key with same-public cert should fail. 56 trace "match $match pubkey + identical cert" 57 echo mekmitasdigoat > $OBJ/authorized_principals_$USER 58 cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER 59 ${SSH} $opts proxy true && fail "ssh succeeded with key+cert" 60 61 # Multiple plain keys should succeed. 62 trace "match $match multiple public" 63 rm -f $OBJ/authorized_principals_$USER 64 cat $OBJ/user_key1.pub $OBJ/user_key2.pub > \ 65 $OBJ/authorized_keys_$USER 66 ${SSH} $opts proxy true || fail "ssh failed with multiple keys" 67 # Cert and different key should succeed 68 69 # Key and different-public cert should succeed. 70 trace "match $match pubkey + different cert" 71 echo mekmitasdigoat > $OBJ/authorized_principals_$USER 72 cat $OBJ/user_key2.pub > $OBJ/authorized_keys_$USER 73 ${SSH} $opts proxy true || fail "ssh failed with key/cert" 74done 75 76