477 lines
18 KiB
Bash
477 lines
18 KiB
Bash
# $OpenBSD: sshsig.sh,v 1.14 2022/02/01 23:37:15 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} -q -t ed25519 -f $OBJ/wrong-key \
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-C "wrong trousers, Grommit" -N '' \
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|| fatal "couldn't generate key"
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WRONG=$OBJ/wrong-key.pub
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# Make a CA key.
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${SSHKEYGEN} -q -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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-V "19840101:19860101" \
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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}/${keybase}.pub
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cert=${OBJ}/${keybase}-cert.pub
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sigfile_cert=${OBJ}/sshsig-${keybase}-cert.sig
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${SSHKEYGEN} -vvv -Y sign -f ${OBJ}/$t -n $sig_namespace \
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-Ohashalg=sha1 < $DATA > $sigfile 2>/dev/null && \
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fail "sign using $t with bad hash algorithm succeeded"
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for h in default sha256 sha512 ; do
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case "$h" in
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default) hashalg_arg="" ;;
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*) hashalg_arg="-Ohashalg=$h" ;;
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esac
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${SSHKEYGEN} -vvv -Y sign -f ${OBJ}/$t -n $sig_namespace \
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$hashalg_arg < $DATA > $sigfile 2>/dev/null || \
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fail "sign using $t / $h failed"
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(printf "$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 / $h key"
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done
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(printf "$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 $t key w/ limited namespace"
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(printf "$sig_principal namespaces=\"$sig_namespace,whatever\" ";
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cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -q -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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-O print-pubkey \
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< $DATA | cut -d' ' -f1-2 > ${OBJ}/${keybase}-fromsig.pub || \
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fail "failed signature for $t key w/ print-pubkey"
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cut -d' ' -f1-2 ${OBJ}/${keybase}.pub > ${OBJ}/${keybase}-strip.pub
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diff -r ${OBJ}/${keybase}-strip.pub ${OBJ}/${keybase}-fromsig.pub || \
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fail "print-pubkey differs from signature key"
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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 $t key with excluded namespace"
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( printf "$sig_principal " ;
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printf "valid-after=\"19800101\",valid-before=\"19900101\" " ;
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cat $pubkey) > $OBJ/allowed_signers
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# key lifespan valid
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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-Overify-time=19850101 \
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< $DATA >/dev/null 2>&1 || \
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fail "failed signature for $t key with valid expiry interval"
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# key not yet valid
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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-Overify-time=19790101 \
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< $DATA >/dev/null 2>&1 && \
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fail "failed signature for $t not-yet-valid key"
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# key expired
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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-Overify-time=19910101 \
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< $DATA >/dev/null 2>&1 && \
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fail "failed signature for $t with expired key"
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# NB. assumes we're not running this test in the 1980s
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${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 $t with expired key"
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# key lifespan valid
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19850101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed find-principals for $t key with valid expiry interval"
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# key not yet valid
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19790101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "failed find-principals for $t not-yet-valid key"
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# key expired
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19990101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "failed find-principals for $t with expired key"
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# NB. assumes we're not running this test in the 1980s
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "failed find-principals for $t with expired key"
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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 others 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 $t key with invalid data"
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# find-principals with valid public key
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(printf "$sig_principal " ; cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile -f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed to find valid principals in allowed_signers"
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# find-principals with wrong key not in allowed_signers
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(printf "$sig_principal " ; cat $WRONG) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile -f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "succeeded finding principal with invalid signers file"
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# find-principals with a configured namespace but none on command-line
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(printf "$sig_principal " ;
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printf "namespaces=\"test1,test2\" ";
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cat $pubkey) > $OBJ/allowed_signers
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed finding principal when namespaces are configured"
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# Check signing keys using ssh-agent.
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${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 ${privkey}
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# Duplicate principals & keys in allowed_signers but with different validities
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( printf "$sig_principal " ;
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printf "valid-after=\"19800101\",valid-before=\"19900101\" " ;
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cat $pubkey;
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printf "${sig_principal} " ;
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printf "valid-after=\"19850101\",valid-before=\"20000101\" " ;
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cat $pubkey) > $OBJ/allowed_signers
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# find-principals outside of any validity lifespan
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="20100101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "succeeded find-principals for $t verify-time outside of validity"
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# find-principals matching only the first lifespan
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19830101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed find-principals for $t verify-time within first span"
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# find-principals matching both lifespans
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19880101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed find-principals for $t verify-time within both spans"
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# find-principals matching only the second lifespan
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19950101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed find-principals for $t verify-time within second span"
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# verify outside of any validity lifespan
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-Overify-time="20100101" -I $sig_principal \
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-r $OBJ/revoked_keys -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 && \
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fail "succeeded verify for $t verify-time outside of validity"
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# verify matching only the first lifespan
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-Overify-time="19830101" -I $sig_principal \
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-r $OBJ/revoked_keys -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 || \
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fail "failed verify for $t verify-time within first span"
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# verify matching both lifespans
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-Overify-time="19880101" -I $sig_principal \
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-r $OBJ/revoked_keys -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 || \
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fail "failed verify for $t verify-time within both spans"
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# verify matching only the second lifespan
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-Overify-time="19950101" -I $sig_principal \
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-r $OBJ/revoked_keys -f $OBJ/allowed_signers \
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< $DATA >/dev/null 2>&1 || \
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fail "failed verify for $t verify-time within second span"
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# Remaining tests are for certificates only.
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case "$keybase" in
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*-cert) ;;
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*) continue ;;
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esac
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# Check key lifespan on find-principals when using the CA
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( printf "$sig_principal " ;
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printf "cert-authority,valid-after=\"19800101\",valid-before=\"19900101\" ";
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cat $CA_PUB) > $OBJ/allowed_signers
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# key lifespan valid
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19850101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed find-principals for $t key with valid expiry interval"
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# key not yet valid
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19790101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "failed find-principals for $t not-yet-valid key"
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# key expired
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time="19990101" \
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-f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "failed find-principals for $t with expired key"
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# NB. assumes we're not running this test in the 1980s
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-f $OBJ/allowed_signers >/dev/null 2>&1 && \
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fail "failed find-principals for $t with expired key"
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# correct CA key
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(printf "$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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-Overify-time=19850101 \
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< $DATA >/dev/null 2>&1 || \
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fail "failed signature for $t cert"
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# find-principals
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time=19850101 \
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-f $OBJ/allowed_signers >/dev/null 2>&1 || \
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fail "failed find-principals for $t with ca key"
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# CA with wildcard principal
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(printf "*@example.com cert-authority " ;
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cat $CA_PUB) > $OBJ/allowed_signers
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# find-principals CA with wildcard principal
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${SSHKEYGEN} -vvv -Y find-principals -s $sigfile \
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-Overify-time=19850101 \
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-f $OBJ/allowed_signers 2>/dev/null | \
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fgrep "$sig_principal" >/dev/null || \
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fail "failed find-principals for $t with ca key using wildcard principal"
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# verify CA with wildcard principal
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${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
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-I $sig_principal -f $OBJ/allowed_signers \
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-Overify-time=19850101 \
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< $DATA >/dev/null 2>&1 || \
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fail "failed signature for $t cert using wildcard principal"
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# signing key listed as cert-authority
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(printf "$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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# Cert valid but CA revoked
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cat $CA_PUB > $OBJ/revoked_keys
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(printf "$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 "accepted signature for $t key, but CA key in revoked_keys"
|
|
|
|
# Set lifespan of CA key and verify signed user certs behave accordingly
|
|
( printf "$sig_principal " ;
|
|
printf "cert-authority,valid-after=\"19800101\",valid-before=\"19900101\" " ;
|
|
cat $CA_PUB) > $OBJ/allowed_signers
|
|
|
|
# CA key lifespan valid
|
|
${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
|
|
-I $sig_principal -f $OBJ/allowed_signers \
|
|
-Overify-time=19850101 \
|
|
< $DATA >/dev/null 2>&1 >/dev/null 2>&1 || \
|
|
fail "failed signature for $t key with valid CA expiry interval"
|
|
# CA lifespan is valid but user key not yet valid
|
|
${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
|
|
-I $sig_principal -f $OBJ/allowed_signers \
|
|
-Overify-time=19810101 \
|
|
< $DATA >/dev/null 2>&1 && \
|
|
fail "accepted signature for $t key with valid CA expiry interval but not yet valid cert"
|
|
# CA lifespan is valid but user key expired
|
|
${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
|
|
-I $sig_principal -f $OBJ/allowed_signers \
|
|
-Overify-time=19890101 \
|
|
< $DATA >/dev/null 2>&1 && \
|
|
fail "accepted signature for $t key with valid CA expiry interval but expired cert"
|
|
# CA key not yet valid
|
|
${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
|
|
-I $sig_principal -f $OBJ/allowed_signers \
|
|
-Overify-time=19790101 \
|
|
< $DATA >/dev/null 2>&1 && \
|
|
fail "accepted signature for $t not-yet-valid CA key"
|
|
# CA key expired
|
|
${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
|
|
-I $sig_principal -f $OBJ/allowed_signers \
|
|
-Overify-time=19910101 \
|
|
< $DATA >/dev/null 2>&1 && \
|
|
fail "accepted signature for $t with expired CA key"
|
|
# NB. assumes we're not running this test in the 1980s
|
|
${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
|
|
-I $sig_principal -f $OBJ/allowed_signers \
|
|
< $DATA >/dev/null 2>&1 && \
|
|
fail "accepted signature for $t with expired CA key"
|
|
|
|
# Set lifespan of CA outside of the cert validity
|
|
( printf "$sig_principal " ;
|
|
printf "cert-authority,valid-after=\"19800101\",valid-before=\"19820101\" " ;
|
|
cat $CA_PUB) > $OBJ/allowed_signers
|
|
# valid cert validity but expired CA
|
|
${SSHKEYGEN} -vvv -Y verify -s $sigfile -n $sig_namespace \
|
|
-I $sig_principal -f $OBJ/allowed_signers \
|
|
-Overify-time=19840101 \
|
|
< $DATA >/dev/null 2>&1 && \
|
|
fail "accepted signature for $t key with expired CA but valid cert"
|
|
|
|
done
|
|
|
|
# Test key independant match-principals
|
|
(
|
|
printf "principal1 " ; cat $pubkey;
|
|
printf "princi* " ; cat $pubkey;
|
|
printf "unique " ; cat $pubkey;
|
|
) > $OBJ/allowed_signers
|
|
|
|
verbose "$tid: match principals"
|
|
${SSHKEYGEN} -Y match-principals -f $OBJ/allowed_signers -I "unique" | \
|
|
fgrep "unique" >/dev/null || \
|
|
fail "faild to match static principal"
|
|
|
|
${SSHKEYGEN} -Y match-principals -f $OBJ/allowed_signers -I "princip" | \
|
|
fgrep "princi*" >/dev/null || \
|
|
fail "faild to match wildcard principal"
|
|
|
|
${SSHKEYGEN} -Y match-principals -f $OBJ/allowed_signers -I "principal1" | \
|
|
fgrep -e "principal1" -e "princi*" >/dev/null || \
|
|
fail "faild to match static and wildcard principal"
|
|
verbose "$tid: nomatch principals"
|
|
for x in princ prince unknown ; do
|
|
${SSHKEYGEN} -Y match-principals -f $OBJ/allowed_signers \
|
|
-I $x >/dev/null 2>&1 && \
|
|
fail "succeeded to match unknown principal \"$x\""
|
|
done
|
|
|
|
trace "kill agent"
|
|
${SSHAGENT} -k > /dev/null
|
|
|