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Certificate Transparency
This commit implements a check for Certificate Transparency support, as proposed in #771.
This commit is contained in:
David Cooper
GitHub
parent
a81b99fd04
commit
3e179ad30d
108
testssl.sh
108
testssl.sh
@ -5348,6 +5348,12 @@ get_server_certificate() {
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GOST_STATUS_PROBLEM=true
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fi
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fi
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case "$proto" in
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"tls1_2") DETECTED_TLS_VERSION="0303" ;;
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"tls1_1") DETECTED_TLS_VERSION="0302" ;;
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"tls1") DETECTED_TLS_VERSION="0301" ;;
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"ssl3") DETECTED_TLS_VERSION="0300" ;;
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esac
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extract_new_tls_extensions $TMPFILE
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# Place the server's certificate in $HOSTCERT and any intermediate
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@ -5563,6 +5569,69 @@ must_staple() {
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fi
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}
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# TODO: This function checks for Certificate Transparency support based on RFC 6962.
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# It will need to be updated to add checks for Certificate Transparency support based on 6962bis.
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certificate_transparency() {
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local cert="$1"
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local ocsp_response="$2"
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local -i number_of_certificates=$3
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local cipher="$4"
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local sni_used="$5"
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local tls_version="$6"
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local sni=""
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local ciphers=""
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local hexc n ciph sslver kx auth enc mac export
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local -i success
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# First check whether signed certificate timestamps (SCT) are included in the
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# server's certificate. If they aren't, check whether the server provided
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# a stapled OCSP response with SCTs. If no SCTs were found in the certificate
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# or OCSP response, check for an SCT TLS extension.
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if $OPENSSL x509 -noout -text 2>>$ERRFILE <<< "$cert" | egrep -q "CT Precertificate SCTs|1.3.6.1.4.1.11129.2.4.2" ; then
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tm_out "certificate extension"
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return 0
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fi
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if egrep -q "CT Certificate SCTs|1.3.6.1.4.1.11129.2.4.5" <<< "$ocsp_response"; then
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tm_out "OCSP extension"
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return 0
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fi
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# If the server only has one certificate, then it is sufficient to check whether
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# determine_tls_extensions() discovered an SCT TLS extension. If the server has more than
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# one certificate, then it is possible that an SCT TLS extension is returned for some
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# certificates, but not for all of them.
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if [[ $number_of_certificates -eq 1 ]] && [[ "$TLS_EXTENSIONS" =~ "signed certificate timestamps" ]]; then
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tm_out "TLS extension"
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return 0
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fi
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if [[ $number_of_certificates -gt 1 ]] && ! "$SSL_NATIVE"; then
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while read hexc n ciph sslver kx auth enc mac export; do
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if [[ ${#hexc} -eq 9 ]]; then
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ciphers+=", ${hexc:2:2},${hexc:7:2}"
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fi
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done < <($OPENSSL ciphers -V $cipher 2>>$ERRFILE)
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[[ -z "$sni_used" ]] && sni="$SNI" && SNI=""
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tls_sockets "${tls_version:2:2}" "${ciphers:2}" "all" "00,12,00,00"
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success=$?
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[[ -z "$sni_used" ]] && SNI="$sni"
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if ( [[ $success -eq 0 ]] || [[ $success -eq 2 ]] ) && \
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grep -a 'TLS server extension ' "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt" | \
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grep -aq "signed certificate timestamps"; then
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tm_out "TLS extension"
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return 0
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fi
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fi
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if [[ $SERVICE != "HTTP" ]]; then
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# At the moment Certificate Transparency only applies to HTTPS.
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tm_out "N/A"
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else
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tm_out "no"
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fi
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return 0
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}
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certificate_info() {
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local proto
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local -i certificate_number=$1
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@ -5572,6 +5641,7 @@ certificate_info() {
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local ocsp_response=$5
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local ocsp_response_status=$6
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local sni_used=$7
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local ct="$8"
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local cert_sig_algo cert_sig_hash_algo cert_key_algo
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local expire days2expire secs2warn ocsp_uri crl
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local startdate enddate issuer_CN issuer_C issuer_O issuer sans san all_san="" cn
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@ -6187,8 +6257,17 @@ certificate_info() {
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pr_svrty_low "--"
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fileout "${json_prefix}CAA_record" "LOW" "DNS Certification Authority Authorization (CAA) Resource Record / RFC6844 : not offered"
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fi
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outln
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outln "\n"
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out "$indent"; pr_bold " Certificate Transparency ";
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if [[ "$ct" =~ extension ]]; then
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pr_done_good "yes"; outln " ($ct)"
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fileout "${json_prefix}certificate_transparency" "OK" "Certificate Transparency: yes ($ct)"
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else
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outln "$ct"
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fileout "${json_prefix}certificate_transparency" "INFO" "Certificate Transparency: $ct"
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fi
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outln
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return $ret
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}
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@ -6199,7 +6278,7 @@ run_server_defaults() {
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local -i i n
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local -i certs_found=0
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local -a previous_hostcert previous_intermediates keysize cipher
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local -a ocsp_response ocsp_response_status sni_used
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local -a ocsp_response ocsp_response_status sni_used tls_version ct
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local -a ciphers_to_test
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local -a -i success
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local cn_nosni cn_sni sans_nosni sans_sni san tls_extensions
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@ -6308,11 +6387,19 @@ run_server_defaults() {
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certs_found=$(( certs_found + 1))
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cipher[certs_found]=${ciphers_to_test[n]}
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keysize[certs_found]=$(awk '/Server public key/ { print $(NF-1) }' $TMPFILE)
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ocsp_response[certs_found]=$(grep -aA 20 "OCSP response" $TMPFILE)
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# If an OCSP response was sent, then get the full
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# response so that certificate_info() can determine
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# whether it includes a certificate transparency extension.
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if grep -a "OCSP response:" $TMPFILE | grep -q "no response sent"; then
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ocsp_response[certs_found]="$(grep -a "OCSP response" $TMPFILE)"
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else
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ocsp_response[certs_found]="$(awk -v n=2 '/OCSP response:/ {start=1; inc=2} /======================================/ { if (start) {inc--} } inc' $TMPFILE)"
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fi
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ocsp_response_status[certs_found]=$(grep -a "OCSP Response Status" $TMPFILE)
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previous_hostcert[certs_found]=$newhostcert
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previous_intermediates[certs_found]=$(cat $TEMPDIR/intermediatecerts.pem)
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[[ $n -ge 8 ]] && sni_used[certs_found]="" || sni_used[certs_found]="$SNI"
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tls_version[certs_found]="$DETECTED_TLS_VERSION"
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fi
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fi
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fi
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@ -6325,6 +6412,15 @@ run_server_defaults() {
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[[ -z "$sessticket_lifetime_hint" ]] && sessticket_lifetime_hint=$(grep -aw "session ticket" $TMPFILE | grep -a lifetime)
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fi
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# Now that all of the server's certificates have been found, determine for
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# each certificate whether certificate transparency information is provided.
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for (( i=1; i <= certs_found; i++ )); do
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ct[i]="$(certificate_transparency "${previous_hostcert[i]}" "${ocsp_response[i]}" "$certs_found" "${cipher[i]}" "${sni_used[i]}" "${tls_version[i]}")"
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# If certificate_transparency() called tls_sockets() and found a "signed certificate timestamps" extension, then add it to $TLS_EXTENSIONS,
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# since it may not have been found by determine_tls_extensions().
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[[ $certs_found -gt 1 ]] && [[ "${ct[i]}" == "TLS extension" ]] && extract_new_tls_extensions "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt"
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done
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outln
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pr_headlineln " Testing server defaults (Server Hello) "
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outln
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@ -6413,12 +6509,10 @@ run_server_defaults() {
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tls_time
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i=1
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while [[ $i -le $certs_found ]]; do
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for (( i=1; i <= certs_found; i++ )); do
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echo "${previous_hostcert[i]}" > $HOSTCERT
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echo "${previous_intermediates[i]}" > $TEMPDIR/intermediatecerts.pem
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certificate_info "$i" "$certs_found" "${cipher[i]}" "${keysize[i]}" "${ocsp_response[i]}" "${ocsp_response_status[i]}" "${sni_used[i]}"
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i=$((i + 1))
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certificate_info "$i" "$certs_found" "${cipher[i]}" "${keysize[i]}" "${ocsp_response[i]}" "${ocsp_response_status[i]}" "${sni_used[i]}" "${ct[i]}"
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done
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}
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