principals-command.sh revision 296781
1# $OpenBSD: principals-command.sh,v 1.1 2015/05/21 06:44:25 djm Exp $ 2# Placed in the Public Domain. 3 4tid="authorized principals command" 5 6rm -f $OBJ/user_ca_key* $OBJ/cert_user_key* 7cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak 8 9if test -z "$SUDO" ; then 10 echo "skipped (SUDO not set)" 11 echo "need SUDO to create file in /var/run, test won't work without" 12 exit 0 13fi 14 15# Establish a AuthorizedPrincipalsCommand in /var/run where it will have 16# acceptable directory permissions. 17PRINCIPALS_CMD="/var/run/principals_command_${LOGNAME}" 18cat << _EOF | $SUDO sh -c "cat > '$PRINCIPALS_CMD'" 19#!/bin/sh 20test "x\$1" != "x${LOGNAME}" && exit 1 21test -f "$OBJ/authorized_principals_${LOGNAME}" && 22 exec cat "$OBJ/authorized_principals_${LOGNAME}" 23_EOF 24test $? -eq 0 || fatal "couldn't prepare principals command" 25$SUDO chmod 0755 "$PRINCIPALS_CMD" 26 27if ! $OBJ/check-perm -m keys-command $PRINCIPALS_CMD ; then 28 echo "skipping: $PRINCIPALS_CMD is unsuitable as " \ 29 "AuthorizedPrincipalsCommand" 30 $SUDO rm -f $PRINCIPALS_CMD 31 exit 0 32fi 33 34# Create a CA key and a user certificate. 35${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_ca_key || \ 36 fatal "ssh-keygen of user_ca_key failed" 37${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/cert_user_key || \ 38 fatal "ssh-keygen of cert_user_key failed" 39${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \ 40 -z $$ -n ${USER},mekmitasdigoat $OBJ/cert_user_key || \ 41 fatal "couldn't sign cert_user_key" 42 43if [ -x $PRINCIPALS_CMD ]; then 44 # Test explicitly-specified principals 45 for privsep in yes no ; do 46 _prefix="privsep $privsep" 47 48 # Setup for AuthorizedPrincipalsCommand 49 rm -f $OBJ/authorized_keys_$USER 50 ( 51 cat $OBJ/sshd_proxy_bak 52 echo "UsePrivilegeSeparation $privsep" 53 echo "AuthorizedKeysFile none" 54 echo "AuthorizedPrincipalsCommand $PRINCIPALS_CMD %u" 55 echo "AuthorizedPrincipalsCommandUser ${LOGNAME}" 56 echo "TrustedUserCAKeys $OBJ/user_ca_key.pub" 57 ) > $OBJ/sshd_proxy 58 59 # XXX test missing command 60 # XXX test failing command 61 62 # Empty authorized_principals 63 verbose "$tid: ${_prefix} empty authorized_principals" 64 echo > $OBJ/authorized_principals_$USER 65 ${SSH} -2i $OBJ/cert_user_key \ 66 -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 67 if [ $? -eq 0 ]; then 68 fail "ssh cert connect succeeded unexpectedly" 69 fi 70 71 # Wrong authorized_principals 72 verbose "$tid: ${_prefix} wrong authorized_principals" 73 echo gregorsamsa > $OBJ/authorized_principals_$USER 74 ${SSH} -2i $OBJ/cert_user_key \ 75 -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 76 if [ $? -eq 0 ]; then 77 fail "ssh cert connect succeeded unexpectedly" 78 fi 79 80 # Correct authorized_principals 81 verbose "$tid: ${_prefix} correct authorized_principals" 82 echo mekmitasdigoat > $OBJ/authorized_principals_$USER 83 ${SSH} -2i $OBJ/cert_user_key \ 84 -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 85 if [ $? -ne 0 ]; then 86 fail "ssh cert connect failed" 87 fi 88 89 # authorized_principals with bad key option 90 verbose "$tid: ${_prefix} authorized_principals bad key opt" 91 echo 'blah mekmitasdigoat' > $OBJ/authorized_principals_$USER 92 ${SSH} -2i $OBJ/cert_user_key \ 93 -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 94 if [ $? -eq 0 ]; then 95 fail "ssh cert connect succeeded unexpectedly" 96 fi 97 98 # authorized_principals with command=false 99 verbose "$tid: ${_prefix} authorized_principals command=false" 100 echo 'command="false" mekmitasdigoat' > \ 101 $OBJ/authorized_principals_$USER 102 ${SSH} -2i $OBJ/cert_user_key \ 103 -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 104 if [ $? -eq 0 ]; then 105 fail "ssh cert connect succeeded unexpectedly" 106 fi 107 108 # authorized_principals with command=true 109 verbose "$tid: ${_prefix} authorized_principals command=true" 110 echo 'command="true" mekmitasdigoat' > \ 111 $OBJ/authorized_principals_$USER 112 ${SSH} -2i $OBJ/cert_user_key \ 113 -F $OBJ/ssh_proxy somehost false >/dev/null 2>&1 114 if [ $? -ne 0 ]; then 115 fail "ssh cert connect failed" 116 fi 117 118 # Setup for principals= key option 119 rm -f $OBJ/authorized_principals_$USER 120 ( 121 cat $OBJ/sshd_proxy_bak 122 echo "UsePrivilegeSeparation $privsep" 123 ) > $OBJ/sshd_proxy 124 125 # Wrong principals list 126 verbose "$tid: ${_prefix} wrong principals key option" 127 ( 128 printf 'cert-authority,principals="gregorsamsa" ' 129 cat $OBJ/user_ca_key.pub 130 ) > $OBJ/authorized_keys_$USER 131 ${SSH} -2i $OBJ/cert_user_key \ 132 -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 133 if [ $? -eq 0 ]; then 134 fail "ssh cert connect succeeded unexpectedly" 135 fi 136 137 # Correct principals list 138 verbose "$tid: ${_prefix} correct principals key option" 139 ( 140 printf 'cert-authority,principals="mekmitasdigoat" ' 141 cat $OBJ/user_ca_key.pub 142 ) > $OBJ/authorized_keys_$USER 143 ${SSH} -2i $OBJ/cert_user_key \ 144 -F $OBJ/ssh_proxy somehost true >/dev/null 2>&1 145 if [ $? -ne 0 ]; then 146 fail "ssh cert connect failed" 147 fi 148 done 149else 150 echo "SKIPPED: $PRINCIPALS_COMMAND not executable " \ 151 "(/var/run mounted noexec?)" 152fi 153