# $OpenBSD: cert-userkey.sh,v 1.6 2010/06/29 23:59:54 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},mekmitasdigoat $OBJ/cert_user_key_${ktype} || fail "couldn't sign cert_user_key_${ktype}" cp $OBJ/cert_user_key_${ktype} $OBJ/cert_user_key_${ktype}_v00 cp $OBJ/cert_user_key_${ktype}.pub $OBJ/cert_user_key_${ktype}_v00.pub ${SSHKEYGEN} -q -t v00 -s $OBJ/user_ca_key -I \ "regress user key for $USER" \ -n ${USER},mekmitasdigoat $OBJ/cert_user_key_${ktype}_v00 || fail "couldn't sign cert_user_key_${ktype}_v00" done # Test explicitly-specified principals for ktype in rsa dsa rsa_v00 dsa_v00 ; do for privsep in yes no ; do _prefix="${ktype} privsep $privsep" # Setup for AuthorizedPrincipalsFile rm -f $OBJ/authorized_keys_$USER ( cat $OBJ/sshd_proxy_bak echo "UsePrivilegeSeparation $privsep" echo "AuthorizedPrincipalsFile " \ "$OBJ/authorized_principals_%u" echo "TrustedUserCAKeys $OBJ/user_ca_key.pub" ) > $OBJ/sshd_proxy # Missing authorized_principals verbose "$tid: ${_prefix} missing authorized_principals" rm -f $OBJ/authorized_principals_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 if [ $? -eq 0 ]; then fail "ssh cert connect succeeded unexpectedly" fi # Empty authorized_principals verbose "$tid: ${_prefix} empty authorized_principals" echo > $OBJ/authorized_principals_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 if [ $? -eq 0 ]; then fail "ssh cert connect succeeded unexpectedly" fi # Wrong authorized_principals verbose "$tid: ${_prefix} wrong authorized_principals" echo gregorsamsa > $OBJ/authorized_principals_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 if [ $? -eq 0 ]; then fail "ssh cert connect succeeded unexpectedly" fi # Correct authorized_principals verbose "$tid: ${_prefix} correct authorized_principals" echo mekmitasdigoat > $OBJ/authorized_principals_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -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} -2i $OBJ/cert_user_key_${ktype} \ -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 if [ $? -eq 0 ]; then fail "ssh cert connect succeeded unexpectedly" fi # authorized_principals with command=false verbose "$tid: ${_prefix} authorized_principals command=false" echo 'command="false" mekmitasdigoat' > \ $OBJ/authorized_principals_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 if [ $? -eq 0 ]; then fail "ssh cert connect succeeded unexpectedly" fi # authorized_principals with command=true verbose "$tid: ${_prefix} authorized_principals command=true" echo 'command="true" mekmitasdigoat' > \ $OBJ/authorized_principals_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -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" ( echon 'cert-authority,principals="gregorsamsa" ' cat $OBJ/user_ca_key.pub ) > $OBJ/authorized_keys_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 if [ $? -eq 0 ]; then fail "ssh cert connect succeeded unexpectedly" fi # Correct principals list verbose "$tid: ${_prefix} correct principals key option" ( echon 'cert-authority,principals="mekmitasdigoat" ' cat $OBJ/user_ca_key.pub ) > $OBJ/authorized_keys_$USER ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 if [ $? -ne 0 ]; then fail "ssh cert connect failed" fi done 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 $OBJ/user_ca_key.pub" fi for ktype in rsa dsa rsa_v00 dsa_v00 ; do for privsep in yes no ; do _prefix="${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 auth_opt=$5 if test "x$auth_choice" = "x" ; then auth_choice="authorized_keys TrustedUserCAKeys" fi for auth in $auth_choice ; do for ktype in rsa rsa_v00 ; do cat $OBJ/sshd_proxy_bak > $OBJ/sshd_proxy if test "x$auth" = "xauthorized_keys" ; then # Add CA to authorized_keys ( echon "cert-authority${auth_opt} " cat $OBJ/user_ca_key.pub ) > $OBJ/authorized_keys_$USER else echo > $OBJ/authorized_keys_$USER echo "TrustedUserCAKeys $OBJ/user_ca_key.pub" \ >> $OBJ/sshd_proxy if test "x$auth_opt" != "x" ; then echo $auth_opt >> $OBJ/sshd_proxy fi fi verbose "$tid: $ident auth $auth expect $result $ktype" ${SSHKEYGEN} -q -s $OBJ/user_ca_key \ -I "regress user key for $USER" \ $sign_opts \ $OBJ/cert_user_key_${ktype} || fail "couldn't sign cert_user_key_${ktype}" ${SSH} -2i $OBJ/cert_user_key_${ktype} \ -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 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 # Check explicitly-specified principals: an empty principals list in the cert # should always be refused. # AuthorizedPrincipalsFile rm -f $OBJ/authorized_keys_$USER echo mekmitasdigoat > $OBJ/authorized_principals_$USER test_one "AuthorizedPrincipalsFile principals" success "-n mekmitasdigoat" \ TrustedUserCAKeys "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u" test_one "AuthorizedPrincipalsFile no principals" failure "" \ TrustedUserCAKeys "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u" # principals= key option rm -f $OBJ/authorized_principals_$USER test_one "principals key option principals" success "-n mekmitasdigoat" \ authorized_keys ',principals="mekmitasdigoat"' test_one "principals key option no principals" failure "" \ authorized_keys ',principals="mekmitasdigoat"' # Wrong certificate cat $OBJ/sshd_proxy_bak > $OBJ/sshd_proxy for ktype in rsa dsa rsa_v00 dsa_v00 ; do case $ktype in *_v00) args="-t v00" ;; *) args="" ;; esac # Self-sign ${SSHKEYGEN} $args -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* rm -f $OBJ/authorized_principals_$USER