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Merge pull request #1960 from dcooper16/certificate_compression
Check for RFC 8879 certificate compression
This commit is contained in:
Dirk Wetter
GitHub
commit
1739ae1400
@ -30,6 +30,7 @@
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* Headerflag X-XSS-Protection is now labeled as INFO
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* Client simulation runs in wide mode which is even better readable
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* Added --reqheader to support custom headers in HTTP requests
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* Test for support for RFC 8879 certificate compression
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### Features implemented / improvements in 3.0
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@ -23,12 +23,13 @@ Full contribution, see git log.
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- experimental "eTLS" detection
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- parallel mass testing!
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- RFC <--> OpenSSL cipher name space switches for the command line
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- better error msg suppression (not fully installed openssl
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- better error msg suppression (not fully installed openssl)
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- GREASE support
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- Bleichenbacher / ROBOT vulnerability test
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- several protocol preferences improvements
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- pwnedkeys.com support
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- CT support
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- RFC 8879, certificate compression
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- Lots of fixes and improvements
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##### Further credits (in alphabetical order)
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98
testssl.sh
98
testssl.sh
@ -7510,6 +7510,49 @@ determine_tls_extensions() {
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return $success
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}
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# Return a list of the certificate compression methods supported (RFC 8879)
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determine_cert_compression() {
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# 1=zlib, 2=brotli, 3=zstd
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local -a supported_compression_methods=("" "false" "false" "false")
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local -i i len nr_compression_methods=3
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local len1 len2 methods_to_test method_found method_nr methods_found=""
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# Certificate compression is only supported by TLS 1.3.
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[[ $(has_server_protocol "tls1_3") -eq 1 ]] && tm_out "" && return 1
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while true; do
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methods_to_test=""
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for (( i=1; i <= nr_compression_methods; i++ )); do
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! "${supported_compression_methods[i]}" && methods_to_test+=" ,00,$(printf "%02x" $i)"
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done
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len=$((2*${#methods_to_test}/7))
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# If there are no more compression methods remaining to be tested, then quit.
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[[ $len -eq 0 ]] && break
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len1=$(printf "%02x" "$len")
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len2=$(printf "%02x" "$((len+1))")
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tls_sockets "04" "$TLS13_CIPHER" "all+" "00,1b, 00,$len2, $len1$methods_to_test"
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if [[ $? -ne 0 ]]; then
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add_proto_offered tls1_3 no
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tm_out ""
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return 1
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fi
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add_proto_offered tls1_3 yes
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method_found="$(awk '/Certificate Compression Algorithm: / { print $4 $5 }' "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt")"
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[[ -z "$method_found" ]] && break
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[[ -z "$methods_found" ]] && tmpfile_handle ${FUNCNAME[0]}.txt "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt"
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method_found="${method_found//(//}"
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method_found="${method_found//)/}"
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method_nr="${method_found%%/*}"
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supported_compression_methods[method_nr]=true
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methods_found+=" $method_found"
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done
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if [[ -n "$methods_found" ]]; then
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methods_found="${methods_found:1}"
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else
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methods_found="none"
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fi
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tm_out "$methods_found"
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return 0
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}
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extract_certificates() {
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local version="$1"
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@ -9500,6 +9543,7 @@ run_server_defaults() {
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local -a ciphers_to_test certificate_type
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local -a -i success
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local cn_nosni cn_sni sans_nosni sans_sni san tls_extensions client_auth_ca
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local cert_compression_methods=""
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local using_sockets=true
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"$SSL_NATIVE" && using_sockets=false
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@ -9707,6 +9751,9 @@ run_server_defaults() {
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done
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determine_tls_extensions
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"$using_sockets" && cert_compression_methods="$(determine_cert_compression)"
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[[ -n "$cert_compression_methods" ]] && [[ "$cert_compression_methods" != "none" ]] && \
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extract_new_tls_extensions "$TEMPDIR/$NODEIP.determine_cert_compression.txt"
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if [[ $? -eq 0 ]] && [[ "$OPTIMAL_PROTO" != -ssl2 ]]; then
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cp "$TEMPDIR/$NODEIP.determine_tls_extensions.txt" $TMPFILE
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@ -9847,6 +9894,20 @@ run_server_defaults() {
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tls_time
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jsonID="cert_compression"
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if ! "$using_sockets"; then
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# At the moment support for certificate compression can only be
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# tested using tls_sockets().
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:
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elif [[ $(has_server_protocol "tls1_3") -eq 0 ]]; then
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jsonID="certificate_compression"
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pr_bold " Certificate Compression "
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outln "$cert_compression_methods"
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fileout "$jsonID" "INFO" "$cert_compression_methods"
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else
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fileout "$jsonID" "INFO" "N/A"
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fi
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jsonID="clientAuth"
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pr_bold " Client Authentication "
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outln "$CLIENT_AUTH"
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@ -13137,6 +13198,7 @@ parse_tls_serverhello() {
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local tls_msg_type tls_content_type tls_protocol tls_protocol2 tls_hello_time
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local tls_err_level tls_err_descr_no tls_cipher_suite rfc_cipher_suite tls_compression_method
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local tls_extensions="" extension_type named_curve_str="" named_curve_oid
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local cert_compression_method="" cert_compression_method_str=""
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local -i i j extension_len extn_len tls_extensions_len ocsp_response_len=0 ocsp_response_list_len ocsp_resp_offset
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local -i certificate_list_len certificate_len cipherlist_len
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local -i curve_type named_curve
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@ -13401,18 +13463,20 @@ parse_tls_serverhello() {
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[[ $DEBUG -ge 1 ]] && tmpfile_handle ${FUNCNAME[0]}.txt
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return 1
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fi
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if [[ $DEBUG -ge 3 ]]; then
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tm_out " Certificate Compression Algorithm: ${tls_handshake_ascii:i:4}"
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case ${tls_handshake_ascii:i:4} in
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0001) tmln_out " (ZLIB)" ;;
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0002) tmln_out " (Brotli)" ;;
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0003) tmln_out " (Zstandard)" ;;
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*) tmln_out ;;
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cert_compression_method="${tls_handshake_ascii:i:4}"
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case $cert_compression_method in
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0001) cert_compression_method_str="ZLIB" ;;
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0002) cert_compression_method_str="Brotli" ;;
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0003) cert_compression_method_str="Zstandard" ;;
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*) cert_compression_method_str="unrecognized" ;;
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esac
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if [[ $DEBUG -ge 3 ]]; then
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tmln_out " Certificate Compression Algorithm: $cert_compression_method ($cert_compression_method_str)"
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offset=$((i+4))
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tmln_out " Uncompressed certificate length: $(printf "%d" 0x${tls_handshake_ascii:offset:6})"
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tmln_out
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fi
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tls_extensions+="TLS server extension \"compress_certificate\" (id=27), len=0\n"
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if [[ "$process_full" =~ all ]] && "$HAS_ZLIB" && [[ "${tls_handshake_ascii:i:4}" == 0001 ]]; then
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offset=$((i+4))
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tls_certificate_ascii_len=2*0x${tls_handshake_ascii:offset:6}
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@ -13872,6 +13936,9 @@ parse_tls_serverhello() {
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esac
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echo "===============================================================================" >> $TMPFILE
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fi
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if [[ -n "$cert_compression_method" ]]; then
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echo "Certificate Compression Algorithm: $cert_compression_method ($cert_compression_method_str)" >> $TMPFILE
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fi
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[[ -n "$tls_extensions" ]] && echo -e "$tls_extensions" >> $TMPFILE
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if [[ $DEBUG -ge 3 ]]; then
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@ -14827,6 +14894,23 @@ prepare_tls_clienthello() {
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all_extensions+="$extension_supported_point_formats"
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fi
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if [[ "0x$tls_low_byte" -ge 0x04 ]] && [[ ! "$extra_extensions_list" =~ " 001b " ]]; then
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# If the response needs to be decrypted, then indicate support
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# for ZLIB certificate compression if $OPENSSL can decompress
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# the result. If the response does not need to be decrypted,
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# then indicate support for all certificate compression methods,
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# as the response does not need to be decompressed.
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if [[ "$process_full" =~ all ]]; then
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if "$HAS_ZLIB"; then
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[[ -n "$all_extensions" ]] && all_extensions+=","
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all_extensions+="00,1b,00,03,02,00,01"
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fi
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else
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[[ -n "$all_extensions" ]] && all_extensions+=","
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all_extensions+="00,1b,00,07,06,00,01,00,02,00,03"
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fi
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fi
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if [[ -n "$extra_extensions" ]]; then
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[[ -n "$all_extensions" ]] && all_extensions+=","
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all_extensions+="$extra_extensions"
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