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ssh signing: verify ssh-keygen in test prereq

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Do a full ssh signing, find-principals and verify operation in the test
prereq's to make sure ssh-keygen works as expected. Only generating the
keys and verifying its presence is not sufficient in some situations.
One example was ssh-keygen creating unusable ssh keys in cygwin because
of unsafe default permissions for the key files. The other a broken
openssh 8.7 that segfaulted on any find-principals operation. This
extended prereq check avoids future test breakages in case ssh-keygen or
any environment behaviour changes.

Signed-off-by: Fabian Stelzer <fs@gigacodes.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Fabian Stelzer 2021-12-09 09:52:49 +01:00 committed by Junio C Hamano
parent 122842fd93
commit 50992f96c5
1 changed files with 40 additions and 13 deletions
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53
t/lib-gpg.sh
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@ -109,34 +109,61 @@ test_lazy_prereq GPGSSH '
echo $ssh_version | grep -q "find-principals:missing signature file"
test $? = 0 || exit 1;
# some broken versions of ssh-keygen segfault on find-principals;
# avoid testing with them.
ssh-keygen -Y find-principals -f /dev/null -s /dev/null
test $? = 139 && exit 1
# Setup some keys and an allowed signers file
mkdir -p "${GNUPGHOME}" &&
chmod 0700 "${GNUPGHOME}" &&
(setfacl -k "${GNUPGHOME}" 2>/dev/null || true) &&
ssh-keygen -t ed25519 -N "" -C "git ed25519 key" -f "${GPGSSH_KEY_PRIMARY}" >/dev/null &&
echo "\"principal with number 1\" $(cat "${GPGSSH_KEY_PRIMARY}.pub")" >> "${GPGSSH_ALLOWED_SIGNERS}" &&
ssh-keygen -t rsa -b 2048 -N "" -C "git rsa2048 key" -f "${GPGSSH_KEY_SECONDARY}" >/dev/null &&
echo "\"principal with number 2\" $(cat "${GPGSSH_KEY_SECONDARY}.pub")" >> "${GPGSSH_ALLOWED_SIGNERS}" &&
ssh-keygen -t ed25519 -N "${GPGSSH_KEY_PASSPHRASE}" -C "git ed25519 encrypted key" -f "${GPGSSH_KEY_WITH_PASSPHRASE}" >/dev/null &&
echo "\"principal with number 3\" $(cat "${GPGSSH_KEY_WITH_PASSPHRASE}.pub")" >> "${GPGSSH_ALLOWED_SIGNERS}" &&
ssh-keygen -t ed25519 -N "" -C "git ed25519 key" -f "${GPGSSH_KEY_UNTRUSTED}" >/dev/null
ssh-keygen -t ed25519 -N "" -C "git ed25519 key" -f "${GPGSSH_KEY_UNTRUSTED}" >/dev/null &&
cat >"${GPGSSH_ALLOWED_SIGNERS}" <<-EOF &&
"principal with number 1" $(cat "${GPGSSH_KEY_PRIMARY}.pub")"
"principal with number 2" $(cat "${GPGSSH_KEY_SECONDARY}.pub")"
"principal with number 3" $(cat "${GPGSSH_KEY_WITH_PASSPHRASE}.pub")"
EOF
# Verify if at least one key and ssh-keygen works as expected
echo "testpayload" |
ssh-keygen -Y sign -n "git" -f "${GPGSSH_KEY_PRIMARY}" >gpgssh_prereq.sig &&
ssh-keygen -Y find-principals -f "${GPGSSH_ALLOWED_SIGNERS}" -s gpgssh_prereq.sig &&
echo "testpayload" |
ssh-keygen -Y verify -n "git" -f "${GPGSSH_ALLOWED_SIGNERS}" -I "principal with number 1" -s gpgssh_prereq.sig
'
test_lazy_prereq GPGSSH_VERIFYTIME '
# Check if ssh-keygen has a verify-time option by passing an invalid date to it
ssh-keygen -Overify-time=INVALID -Y check-novalidate -s doesnotmatter 2>&1 | grep -q -F "Invalid \"verify-time\"" &&
# Set up keys with key lifetimes
ssh-keygen -t ed25519 -N "" -C "timeboxed valid key" -f "${GPGSSH_KEY_TIMEBOXEDVALID}" >/dev/null &&
echo "\"timeboxed valid key\" valid-after=\"20050407000000\",valid-before=\"200504100000\" $(cat "${GPGSSH_KEY_TIMEBOXEDVALID}.pub")" >> "${GPGSSH_ALLOWED_SIGNERS}" &&
key_valid=$(cat "${GPGSSH_KEY_TIMEBOXEDVALID}.pub") &&
ssh-keygen -t ed25519 -N "" -C "timeboxed invalid key" -f "${GPGSSH_KEY_TIMEBOXEDINVALID}" >/dev/null &&
echo "\"timeboxed invalid key\" valid-after=\"20050401000000\",valid-before=\"20050402000000\" $(cat "${GPGSSH_KEY_TIMEBOXEDINVALID}.pub")" >> "${GPGSSH_ALLOWED_SIGNERS}" &&
key_invalid=$(cat "${GPGSSH_KEY_TIMEBOXEDINVALID}.pub") &&
ssh-keygen -t ed25519 -N "" -C "expired key" -f "${GPGSSH_KEY_EXPIRED}" >/dev/null &&
echo "\"principal with expired key\" valid-before=\"20000101000000\" $(cat "${GPGSSH_KEY_EXPIRED}.pub")" >> "${GPGSSH_ALLOWED_SIGNERS}" &&
key_expired=$(cat "${GPGSSH_KEY_EXPIRED}.pub") &&
ssh-keygen -t ed25519 -N "" -C "not yet valid key" -f "${GPGSSH_KEY_NOTYETVALID}" >/dev/null &&
echo "\"principal with not yet valid key\" valid-after=\"29990101000000\" $(cat "${GPGSSH_KEY_NOTYETVALID}.pub")" >> "${GPGSSH_ALLOWED_SIGNERS}"
key_notyetvalid=$(cat "${GPGSSH_KEY_NOTYETVALID}.pub") &&
# Timestamps outside of test_tick span
ts2005a=20050401000000 ts2005b=200504020000 &&
# Timestamps within test_tick span
ts2005c=20050407000000 ts2005d=200504100000 &&
# Definitely not yet valid / expired timestamps
ts2000=20000101000000 ts2999=29990101000000 &&
cat >>"${GPGSSH_ALLOWED_SIGNERS}" <<-EOF &&
"timeboxed valid key" valid-after="$ts2005c",valid-before="$ts2005d" $key_valid"
"timeboxed invalid key" valid-after="$ts2005a",valid-before="$ts2005b" $key_invalid"
"principal with expired key" valid-before="$ts2000" $key_expired"
"principal with not yet valid key" valid-after="$ts2999" $key_notyetvalid"
EOF
# and verify ssh-keygen verifies the key lifetime
echo "testpayload" |
ssh-keygen -Y sign -n "git" -f "${GPGSSH_KEY_EXPIRED}" >gpgssh_verifytime_prereq.sig &&
! (ssh-keygen -Y verify -n "git" -f "${GPGSSH_ALLOWED_SIGNERS}" -I "principal with expired key" -s gpgssh_verifytime_prereq.sig)
'
sanitize_pgp() {