197 lines
6.7 KiB
Bash
197 lines
6.7 KiB
Bash
# $OpenBSD: sshsig.sh,v 1.4 2020/03/13 03:18:45 djm Exp $
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# Placed in the Public Domain.
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tid="sshsig"
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DATA2=$OBJ/${DATANAME}.2
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cat ${DATA} ${DATA} > ${DATA2}
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rm -f $OBJ/sshsig-*.sig $OBJ/wrong-key* $OBJ/sigca-key*
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sig_namespace="test-$$"
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sig_principal="user-$$@example.com"
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# Make a "wrong key"
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${SSHKEYGEN} -t ed25519 -f $OBJ/wrong-key -C "wrong trousers, Grommit" -N '' \
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|| fatal "couldn't generate key"
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WRONG=$OBJ/wrong-key.pub
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# Make a CA key.
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${SSHKEYGEN} -t ed25519 -f $OBJ/sigca-key -C "CA" -N '' \
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|| fatal "couldn't generate key"
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CA_PRIV=$OBJ/sigca-key
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CA_PUB=$OBJ/sigca-key.pub
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trace "start agent"
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eval `${SSHAGENT} ${EXTRA_AGENT_ARGS} -s` > /dev/null
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r=$?
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if [ $r -ne 0 ]; then
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fatal "could not start ssh-agent: exit code $r"
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fi
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SIGNKEYS="$SSH_KEYTYPES"
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verbose "$tid: make certificates"
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for t in $SSH_KEYTYPES ; do
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${SSHKEYGEN} -q -s $CA_PRIV -z $$ \
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-I "regress signature key for $USER" \
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-n $sig_principal $OBJ/${t} || \
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fatal "couldn't sign ${t}"
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SIGNKEYS="$SIGNKEYS ${t}-cert.pub"
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done
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for t in $SIGNKEYS; do
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verbose "$tid: check signature for $t"
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keybase=`basename $t .pub`
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privkey=${OBJ}/`basename $t -cert.pub`
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sigfile=${OBJ}/sshsig-${keybase}.sig
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sigfile_agent=${OBJ}/sshsig-agent-${keybase}.sig
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pubkey=${OBJ}/${keybase}.pub
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${SSHKEYGEN} -vvv -Y sign -f ${OBJ}/$t -n $sig_namespace \
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< $DATA > $sigfile 2>/dev/null || fail "sign using $t failed"
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(printf "$sig_principal " ; cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 || \
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fail "failed signature for $t key"
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(printf "$sig_principal namespaces=\"$sig_namespace,whatever\" ";
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cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 || \
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fail "failed signature for $t key w/ limited namespace"
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# Invalid option
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(printf "$sig_principal octopus " ; cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t key with bad signers option"
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# Wrong key trusted.
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(printf "$sig_principal " ; cat $WRONG) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t key with wrong key trusted"
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# incorrect data
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(printf "$sig_principal " ; cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA2 >/dev/null 2>&1 && \
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fail "passed signature for wrong data with $t key"
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# wrong principal in signers
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(printf "josef.k@example.com " ; cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t key with wrong principal"
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# wrong namespace
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(printf "$sig_principal " ; cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n COWS_COWS_COWS \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t key with wrong namespace"
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# namespace excluded by option
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(printf "$sig_principal namespaces=\"whatever\" " ;
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cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t key with excluded namespace"
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# public key in revoked keys file
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cat $pubkey > $OBJ/revoked_keys
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(printf "$sig_principal namespaces=\"whatever\" " ;
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cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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-r $OBJ/revoked_keys \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t key, but key is in revoked_keys"
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# public key not revoked, but other are present in revoked_keysfile
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cat $WRONG > $OBJ/revoked_keys
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(printf "$sig_principal " ; cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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-r $OBJ/revoked_keys \
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< $DATA >/dev/null 2>&1 || \
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fail "couldn't verify signature for $t key, but key not in revoked_keys"
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# check-novalidate with valid data
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${SSHKEYGEN} -vvv -Y check-novalidate -s $sigfile -n $sig_namespace \
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< $DATA >/dev/null 2>&1 || \
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fail "failed to check valid signature for $t key"
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# check-novalidate with invalid data
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${SSHKEYGEN} -vvv -Y check-novalidate -s $sigfile -n $sig_namespace \
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< $DATA2 >/dev/null 2>&1 && \
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fail "succeeded checking signature for $t key with invalid data"
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# Check signing keys using ssh-agent.
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${SSHADD} -D >/dev/null 2>&1 # Remove all previously-loaded keys.
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${SSHADD} ${privkey} > /dev/null 2>&1 || fail "ssh-add failed"
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# Move private key to ensure agent key is used
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mv ${privkey} ${privkey}.tmp
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${SSHKEYGEN} -vvv -Y sign -f $pubkey -n $sig_namespace \
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< $DATA > $sigfile_agent 2>/dev/null || \
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fail "ssh-agent based sign using $pubkey failed"
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${SSHKEYGEN} -vvv -Y check-novalidate -s $sigfile_agent \
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-n $sig_namespace < $DATA >/dev/null 2>&1 || \
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fail "failed to check valid signature for $t key"
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# Move private key back
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mv ${privkey}.tmp ${privkey}
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# Remaining tests are for certificates only.
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case "$keybase" in
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*-cert) ;;
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*) continue ;;
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esac
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# correct CA key
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(printf "$sig_principal cert-authority " ;
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cat $CA_PUB) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 || \
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fail "failed signature for $t cert"
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# signing key listed as cert-authority
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(printf "$sig_principal cert-authority" ;
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cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature with $t key listed as CA"
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# CA key not flagged cert-authority
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(printf "$sig_principal " ; cat $CA_PUB) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t cert with CA not marked"
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# mismatch between cert principal and file
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(printf "josef.k@example.com cert-authority" ;
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cat $CA_PUB) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "accepted signature for $t cert with wrong principal"
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done
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trace "kill agent"
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${SSHAGENT} -k > /dev/null
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