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392 lines
12 KiB
Bash
392 lines
12 KiB
Bash
# $OpenBSD: cert-userkey.sh,v 1.20 2018/10/31 11:09:27 dtucker Exp $
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# Placed in the Public Domain.
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tid="certified user keys"
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rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/cert_user_key*
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cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
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cp $OBJ/ssh_proxy $OBJ/ssh_proxy_bak
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PLAIN_TYPES=`$SSH -Q key-plain | sed 's/^ssh-dss/ssh-dsa/;s/^ssh-//'`
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EXTRA_TYPES=""
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if echo "$PLAIN_TYPES" | grep '^rsa$' >/dev/null 2>&1 ; then
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PLAIN_TYPES="$PLAIN_TYPES rsa-sha2-256 rsa-sha2-512"
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fi
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kname() {
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case $ktype in
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rsa-sha2-*) n="$ktype" ;;
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# subshell because some seds will add a newline
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*) n=$(echo $1 | sed 's/^dsa/ssh-dss/;s/^rsa/ssh-rsa/;s/^ed/ssh-ed/') ;;
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esac
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echo "$n*,ssh-rsa*,ssh-ed25519*"
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}
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# Create a CA key
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${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_ca_key ||\
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fail "ssh-keygen of user_ca_key failed"
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# Generate and sign user keys
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for ktype in $PLAIN_TYPES $EXTRA_TYPES ; do
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verbose "$tid: sign user ${ktype} cert"
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${SSHKEYGEN} -q -N '' -t ${ktype} \
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-f $OBJ/cert_user_key_${ktype} || \
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fatal "ssh-keygen of cert_user_key_${ktype} failed"
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# Generate RSA/SHA2 certs for rsa-sha2* keys.
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case $ktype in
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rsa-sha2-*) tflag="-t $ktype" ;;
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*) tflag="" ;;
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esac
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${SSHKEYGEN} -q -s $OBJ/user_ca_key -z $$ \
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-I "regress user key for $USER" \
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-n ${USER},mekmitasdigoat $tflag $OBJ/cert_user_key_${ktype} || \
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fatal "couldn't sign cert_user_key_${ktype}"
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done
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# Test explicitly-specified principals
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for ktype in $EXTRA_TYPES $PLAIN_TYPES ; do
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t=$(kname $ktype)
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for privsep in yes sandbox ; do
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_prefix="${ktype} privsep $privsep"
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# Setup for AuthorizedPrincipalsFile
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rm -f $OBJ/authorized_keys_$USER
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(
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cat $OBJ/sshd_proxy_bak
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echo "UsePrivilegeSeparation $privsep"
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echo "AuthorizedPrincipalsFile " \
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"$OBJ/authorized_principals_%u"
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echo "TrustedUserCAKeys $OBJ/user_ca_key.pub"
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echo "PubkeyAcceptedKeyTypes ${t}"
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) > $OBJ/sshd_proxy
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(
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cat $OBJ/ssh_proxy_bak
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echo "PubkeyAcceptedKeyTypes ${t}"
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) > $OBJ/ssh_proxy
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# Missing authorized_principals
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verbose "$tid: ${_prefix} missing authorized_principals"
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rm -f $OBJ/authorized_principals_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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# Empty authorized_principals
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verbose "$tid: ${_prefix} empty authorized_principals"
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echo > $OBJ/authorized_principals_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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# Wrong authorized_principals
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verbose "$tid: ${_prefix} wrong authorized_principals"
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echo gregorsamsa > $OBJ/authorized_principals_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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# Correct authorized_principals
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verbose "$tid: ${_prefix} correct authorized_principals"
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echo mekmitasdigoat > $OBJ/authorized_principals_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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fail "ssh cert connect failed"
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fi
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# authorized_principals with bad key option
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verbose "$tid: ${_prefix} authorized_principals bad key opt"
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echo 'blah mekmitasdigoat' > $OBJ/authorized_principals_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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# authorized_principals with command=false
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verbose "$tid: ${_prefix} authorized_principals command=false"
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echo 'command="false" mekmitasdigoat' > \
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$OBJ/authorized_principals_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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# authorized_principals with command=true
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verbose "$tid: ${_prefix} authorized_principals command=true"
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echo 'command="true" mekmitasdigoat' > \
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$OBJ/authorized_principals_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost false >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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fail "ssh cert connect failed"
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fi
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# Setup for principals= key option
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rm -f $OBJ/authorized_principals_$USER
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(
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cat $OBJ/sshd_proxy_bak
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echo "UsePrivilegeSeparation $privsep"
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echo "PubkeyAcceptedKeyTypes ${t}"
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) > $OBJ/sshd_proxy
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(
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cat $OBJ/ssh_proxy_bak
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echo "PubkeyAcceptedKeyTypes ${t}"
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) > $OBJ/ssh_proxy
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# Wrong principals list
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verbose "$tid: ${_prefix} wrong principals key option"
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(
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printf 'cert-authority,principals="gregorsamsa" '
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cat $OBJ/user_ca_key.pub
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) > $OBJ/authorized_keys_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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# Correct principals list
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verbose "$tid: ${_prefix} correct principals key option"
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(
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printf 'cert-authority,principals="mekmitasdigoat" '
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cat $OBJ/user_ca_key.pub
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) > $OBJ/authorized_keys_$USER
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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fail "ssh cert connect failed"
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fi
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done
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done
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basic_tests() {
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auth=$1
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if test "x$auth" = "xauthorized_keys" ; then
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# Add CA to authorized_keys
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(
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printf 'cert-authority '
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cat $OBJ/user_ca_key.pub
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) > $OBJ/authorized_keys_$USER
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else
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echo > $OBJ/authorized_keys_$USER
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extra_sshd="TrustedUserCAKeys $OBJ/user_ca_key.pub"
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fi
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for ktype in $PLAIN_TYPES ; do
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t=$(kname $ktype)
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for privsep in yes no ; do
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_prefix="${ktype} privsep $privsep $auth"
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# Simple connect
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verbose "$tid: ${_prefix} connect"
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(
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cat $OBJ/sshd_proxy_bak
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echo "UsePrivilegeSeparation $privsep"
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echo "PubkeyAcceptedKeyTypes ${t}"
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echo "$extra_sshd"
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) > $OBJ/sshd_proxy
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(
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cat $OBJ/ssh_proxy_bak
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echo "PubkeyAcceptedKeyTypes ${t}"
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) > $OBJ/ssh_proxy
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true
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if [ $? -ne 0 ]; then
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fail "ssh cert connect failed"
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fi
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# Revoked keys
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verbose "$tid: ${_prefix} revoked key"
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(
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cat $OBJ/sshd_proxy_bak
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echo "UsePrivilegeSeparation $privsep"
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echo "RevokedKeys $OBJ/cert_user_key_revoked"
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echo "PubkeyAcceptedKeyTypes ${t}"
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echo "$extra_sshd"
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) > $OBJ/sshd_proxy
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cp $OBJ/cert_user_key_${ktype}.pub \
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$OBJ/cert_user_key_revoked
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpecedly"
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fi
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verbose "$tid: ${_prefix} revoked via KRL"
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rm $OBJ/cert_user_key_revoked
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${SSHKEYGEN} -kqf $OBJ/cert_user_key_revoked \
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$OBJ/cert_user_key_${ktype}.pub
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpecedly"
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fi
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verbose "$tid: ${_prefix} empty KRL"
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${SSHKEYGEN} -kqf $OBJ/cert_user_key_revoked
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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fail "ssh cert connect failed"
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fi
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done
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# Revoked CA
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verbose "$tid: ${ktype} $auth revoked CA key"
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(
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cat $OBJ/sshd_proxy_bak
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echo "RevokedKeys $OBJ/user_ca_key.pub"
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echo "PubkeyAcceptedKeyTypes ${t}"
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echo "$extra_sshd"
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) > $OBJ/sshd_proxy
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${SSH} -i $OBJ/cert_user_key_${ktype} -F $OBJ/ssh_proxy \
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somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpecedly"
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fi
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done
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verbose "$tid: $auth CA does not authenticate"
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(
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cat $OBJ/sshd_proxy_bak
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echo "PubkeyAcceptedKeyTypes ${t}"
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echo "$extra_sshd"
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) > $OBJ/sshd_proxy
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verbose "$tid: ensure CA key does not authenticate user"
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${SSH} -i $OBJ/user_ca_key \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect with CA key succeeded unexpectedly"
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fi
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}
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basic_tests authorized_keys
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basic_tests TrustedUserCAKeys
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test_one() {
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ident=$1
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result=$2
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sign_opts=$3
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auth_choice=$4
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auth_opt=$5
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if test "x$auth_choice" = "x" ; then
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auth_choice="authorized_keys TrustedUserCAKeys"
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fi
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for auth in $auth_choice ; do
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for ktype in rsa ed25519 ; do
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cat $OBJ/sshd_proxy_bak > $OBJ/sshd_proxy
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if test "x$auth" = "xauthorized_keys" ; then
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# Add CA to authorized_keys
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(
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printf "cert-authority${auth_opt} "
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cat $OBJ/user_ca_key.pub
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) > $OBJ/authorized_keys_$USER
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else
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echo > $OBJ/authorized_keys_$USER
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echo "TrustedUserCAKeys $OBJ/user_ca_key.pub" \
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>> $OBJ/sshd_proxy
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echo "PubkeyAcceptedKeyTypes ${t}*" \
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>> $OBJ/sshd_proxy
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if test "x$auth_opt" != "x" ; then
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echo $auth_opt >> $OBJ/sshd_proxy
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fi
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fi
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verbose "$tid: $ident auth $auth expect $result $ktype"
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${SSHKEYGEN} -q -s $OBJ/user_ca_key \
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-I "regress user key for $USER" \
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$sign_opts $OBJ/cert_user_key_${ktype} ||
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fail "couldn't sign cert_user_key_${ktype}"
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${SSH} -i $OBJ/cert_user_key_${ktype} \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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rc=$?
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if [ "x$result" = "xsuccess" ] ; then
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if [ $rc -ne 0 ]; then
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fail "$ident failed unexpectedly"
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fi
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else
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if [ $rc -eq 0 ]; then
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fail "$ident succeeded unexpectedly"
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fi
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fi
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done
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done
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}
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test_one "correct principal" success "-n ${USER}"
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test_one "host-certificate" failure "-n ${USER} -h"
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test_one "wrong principals" failure "-n foo"
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test_one "cert not yet valid" failure "-n ${USER} -V20200101:20300101"
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test_one "cert expired" failure "-n ${USER} -V19800101:19900101"
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test_one "cert valid interval" success "-n ${USER} -V-1w:+2w"
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test_one "wrong source-address" failure "-n ${USER} -Osource-address=10.0.0.0/8"
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test_one "force-command" failure "-n ${USER} -Oforce-command=false"
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# Behaviour is different here: TrustedUserCAKeys doesn't allow empty principals
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test_one "empty principals" success "" authorized_keys
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test_one "empty principals" failure "" TrustedUserCAKeys
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# Check explicitly-specified principals: an empty principals list in the cert
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# should always be refused.
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# AuthorizedPrincipalsFile
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rm -f $OBJ/authorized_keys_$USER
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echo mekmitasdigoat > $OBJ/authorized_principals_$USER
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test_one "AuthorizedPrincipalsFile principals" success "-n mekmitasdigoat" \
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TrustedUserCAKeys "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u"
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test_one "AuthorizedPrincipalsFile no principals" failure "" \
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TrustedUserCAKeys "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u"
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# principals= key option
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rm -f $OBJ/authorized_principals_$USER
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test_one "principals key option principals" success "-n mekmitasdigoat" \
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authorized_keys ',principals="mekmitasdigoat"'
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test_one "principals key option no principals" failure "" \
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authorized_keys ',principals="mekmitasdigoat"'
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# command= options vs. force-command in key
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test_one "force-command match true" success \
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"-n ${USER} -Oforce-command=true" \
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authorized_keys ',command="true"'
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test_one "force-command match true" failure \
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"-n ${USER} -Oforce-command=false" \
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authorized_keys ',command="false"'
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test_one "force-command mismatch 1" failure \
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"-n ${USER} -Oforce-command=false" \
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authorized_keys ',command="true"'
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test_one "force-command mismatch 2" failure \
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"-n ${USER} -Oforce-command=true" \
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authorized_keys ',command="false"'
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# Wrong certificate
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cat $OBJ/sshd_proxy_bak > $OBJ/sshd_proxy
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for ktype in $PLAIN_TYPES ; do
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t=$(kname $ktype)
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# Self-sign
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${SSHKEYGEN} -q -s $OBJ/cert_user_key_${ktype} -I \
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"regress user key for $USER" \
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-n $USER $OBJ/cert_user_key_${ktype} ||
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fatal "couldn't sign cert_user_key_${ktype}"
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verbose "$tid: user ${ktype} connect wrong cert"
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${SSH} -i $OBJ/cert_user_key_${ktype} -F $OBJ/ssh_proxy \
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somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect $ident succeeded unexpectedly"
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fi
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done
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rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/cert_user_key*
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rm -f $OBJ/authorized_principals_$USER
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