2021-07-19 08:48:33 +00:00
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# $OpenBSD: sshfp-connect.sh,v 1.2 2021/07/19 08:48:33 dtucker Exp $
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2021-07-19 03:47:51 +00:00
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# Placed in the Public Domain.
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# This test requires external setup and thus is skipped unless
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# TEST_SSH_SSHFP_DOMAIN is set. It requires:
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# 1) A DNSSEC-enabled domain, which TEST_SSH_SSHFP_DOMAIN points to.
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# 2) A DNSSEC-validating resolver such as unwind(8).
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# 3) The following SSHFP records with fingerprints from rsa_openssh.pub
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# in that domain that are expected to succeed:
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# sshtest: valid sha1 and sha256 fingerprints.
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# sshtest-sha{1,256}, : valid fingerprints for that type only.
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# and the following records that are expected to fail:
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# sshtest-bad: invalid sha1 fingerprint and good sha256 fingerprint
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# sshtest-sha{1,256}-bad: invalid fingerprints for that type only.
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#
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# sshtest IN SSHFP 1 1 99C79CC09F5F81069CC017CDF9552CFC94B3B929
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# sshtest IN SSHFP 1 2 E30D6B9EB7A4DE495324E4D5870B8220577993EA6AF417E8E4A4F1C5 BF01A9B6
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# sshtest-sha1 IN SSHFP 1 1 99C79CC09F5F81069CC017CDF9552CFC94B3B929
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# sshtest-sha256 IN SSHFP 1 2 E30D6B9EB7A4DE495324E4D5870B8220577993EA6AF417E8E4A4F1C5 BF01A9B6
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# sshtest-bad IN SSHFP 1 2 E30D6B9EB7A4DE495324E4D5870B8220577993EA6AF417E8E4A4F1C5 BF01A9B6
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# sshtest-bad IN SSHFP 1 1 99C79CC09F5F81069CC017CDF9552CFC94B3B928
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# sshtest-sha1-bad IN SSHFP 1 1 99D79CC09F5F81069CC017CDF9552CFC94B3B929
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# sshtest-sha256-bad IN SSHFP 1 2 E30D6B9EB7A4DE495324E4D5870B8220577993EA6AF417E8E4A4F1C5 BF01A9B5
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tid="sshfp connect"
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if [ ! -z "${TEST_SSH_SSHFP_DOMAIN}" ] && \
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$SSH -Q key-plain | grep ssh-rsa >/dev/null; then
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# Set RSA host key to match fingerprints above.
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mv $OBJ/sshd_proxy $OBJ/sshd_proxy.orig
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2021-07-19 08:48:33 +00:00
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$SUDO cp $SRC/rsa_openssh.prv $OBJ/host.ssh-rsa
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$SUDO chmod 600 $OBJ/host.ssh-rsa
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2021-07-19 03:47:51 +00:00
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sed -e "s|$OBJ/ssh-rsa|$OBJ/host.ssh-rsa|" \
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$OBJ/sshd_proxy.orig > $OBJ/sshd_proxy
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# Zero out known hosts and key aliases to force use of SSHFP records.
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> $OBJ/known_hosts
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mv $OBJ/ssh_proxy $OBJ/ssh_proxy.orig
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sed -e "/HostKeyAlias.*localhost-with-alias/d" \
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-e "/Hostname.*127.0.0.1/d" \
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$OBJ/ssh_proxy.orig > $OBJ/ssh_proxy
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for n in sshtest sshtest-sha1 sshtest-sha256; do
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trace "sshfp connect $n good fingerprint"
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host="${n}.dtucker.net"
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opts="-F $OBJ/ssh_proxy -o VerifyHostKeyDNS=yes "
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opts="$opts -o HostKeyAlgorithms=ssh-rsa"
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host="${n}.${TEST_SSH_SSHFP_DOMAIN}"
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SSH_CONNECTION=`${SSH} $opts $host 'echo $SSH_CONNECTION'`
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if [ $? -ne 0 ]; then
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fail "ssh sshfp connect failed"
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fi
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if [ "$SSH_CONNECTION" != "UNKNOWN 65535 UNKNOWN 65535" ]; then
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fail "bad SSH_CONNECTION: $SSH_CONNECTION"
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fi
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trace "sshfp connect $n bad fingerprint"
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host="${n}-bad.${TEST_SSH_SSHFP_DOMAIN}"
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if ${SSH} $opts ${host} true; then
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fail "sshfp-connect succeeded with bad SSHFP record"
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fi
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done
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else
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echo SKIPPED: TEST_SSH_SSHFP_DOMAIN not set.
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fi
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