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390 lines
12 KiB
390 lines
12 KiB
# $OpenBSD: cert-userkey.sh,v 1.17 2016/11/30 03:01:33 djm 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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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 $ktype in |
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rsa-sha2-*) ;; |
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# subshell because some seds will add a newline |
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*) n=$(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 $ktype) |
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for privsep in yes no ; do |
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_prefix="${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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} -2i $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} -2i $OBJ/cert_user_key_${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} -2i $OBJ/cert_user_key_${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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