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[gentls_cert] Update message digest 

Debian Buster updated /etc/ssl/openssl.cnf to default to

MinProtocol = TLSv1.2
CipherString = DEFAULT@SECLEVEL=2

gentls_cert currently uses SHA1 as message digest. According to OpenSSL
documentation this only offers 80 bit of security. 80 bits is enough for
security level 1, but not 2.

The OpenSSL default MD nowadays is SHA256. This commit updates
gentls_cert to use it.

Issue was reported on the FS mailing list. The certificates created by
gentls_cert caused "md too weak" errors and clients were unable to
connect.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
This commit is contained in:
Sebastian Kemper 2019-11-13 20:29:50 +01:00
parent f8dc87bd18
commit 70d1cbafe4
1 changed files with 3 additions and 3 deletions
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6
scripts/gentls_cert.in
View File

@ -89,7 +89,7 @@ setup_ca() {
openssl req -out "${CONFDIR}/CA/cacert.pem" \
-new -x509 -keyout "${CONFDIR}/CA/cakey.pem" \
-config "${TMPFILE}.cfg" -nodes -days ${DAYS} -sha1 >/dev/null || exit 1
-config "${TMPFILE}.cfg" -nodes -days ${DAYS} -sha256 >/dev/null || exit 1
cat "${CONFDIR}/CA/cacert.pem" > "${CONFDIR}/cafile.pem"
cp $TMPFILE.cfg /tmp/ssl.cfg
rm "${TMPFILE}.cfg"
@ -131,11 +131,11 @@ generate_cert() {
openssl req -new -out "${TMPFILE}.req" \
-newkey rsa:${KEY_SIZE} -keyout "${TMPFILE}.key" \
-config "${TMPFILE}.cfg" -nodes -sha1 >/dev/null || exit 1
-config "${TMPFILE}.cfg" -nodes -sha256 >/dev/null || exit 1
openssl x509 -req -CAkey "${CONFDIR}/CA/cakey.pem" -CA "${CONFDIR}/CA/cacert.pem" -CAcreateserial \
-in "${TMPFILE}.req" -out "${TMPFILE}.crt" -extfile "${TMPFILE}.cfg" \
-extensions "${EXTENSIONS}" -days ${DAYS} -sha1 >/dev/null || exit 1
-extensions "${EXTENSIONS}" -days ${DAYS} -sha256 >/dev/null || exit 1
cat "${TMPFILE}.crt" "${TMPFILE}.key" > "${CONFDIR}/${OUTFILE}"