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https://github.com/drwetter/testssl.sh.git
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Show server supported signature algorithms
This commit modifies run_fs() to show the signature algorithms the server supports in the ServerKeyExchange message for TLS 1.2 and in the CertificateVerify message for TLS 1.3. Signature algorithms are not shown for TLS 1.1 and earlier, since for those protocol versions the signature algorithm to use is specified by the protocol. While the signature algorithm used in TLS 1.1 and earlier is weak, testssl.sh already warns if these protocol versions are supported.
This commit is contained in:
David Cooper
parent
462a602625
commit
6088eddab6
@ -66,6 +66,8 @@
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"FS_ciphers","testssl.sh/81.169.166.184","443","INFO","TLS_AES_256_GCM_SHA384 TLS_CHACHA20_POLY1305_SHA256 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-SHA384 ECDHE-RSA-AES256-SHA DHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-SHA256 DHE-RSA-AES256-SHA DHE-RSA-CAMELLIA256-SHA TLS_AES_128_GCM_SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-SHA DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA DHE-RSA-CAMELLIA128-SHA","",""
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"FS_ECDHE_curves","testssl.sh/81.169.166.184","443","OK","prime256v1 secp384r1 secp521r1 X25519 X448","",""
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"DH_groups","testssl.sh/81.169.166.184","443","OK","Unknown DH group (2048 bits)","",""
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"FS_TLS12_sig_algs","testssl.sh/81.169.166.184","443","INFO","RSA-PSS+SHA256 RSA-PSS+SHA384 RSA-PSS+SHA512 RSA+SHA256 RSA+SHA384 RSA+SHA512 RSA+SHA224","",""
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"FS_TLS13_sig_algs","testssl.sh/81.169.166.184","443","INFO","RSA-PSS+SHA256 RSA-PSS+SHA384 RSA-PSS+SHA512","",""
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"HTTP_status_code","testssl.sh/81.169.166.184","443","INFO","200 OK ('/')","",""
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"HTTP_clock_skew","testssl.sh/81.169.166.184","443","INFO","0 seconds from localtime","",""
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"HTTP_headerTime","testssl.sh/81.169.166.184","443","INFO","1654006271","",""
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139
testssl.sh
139
testssl.sh
@ -6265,6 +6265,19 @@ run_cipherlists() {
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return $ret
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}
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pr_sigalg_quality() {
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local sigalg="$1"
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if [[ "$sigalg" =~ MD5 ]]; then
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pr_svrty_high "$sigalg"
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elif [[ "$sigalg" =~ SHA1 ]]; then
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pr_svrty_low "$sigalg"
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else
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out "$sigalg"
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fi
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}
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# The return value is an indicator of the quality of the DH key length in $1:
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# 1 = pr_svrty_critical, 2 = pr_svrty_high, 3 = pr_svrty_medium, 4 = pr_svrty_low
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# 5 = neither good nor bad, 6 = pr_svrty_good, 7 = pr_svrty_best
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@ -10319,7 +10332,7 @@ get_san_dns_from_cert() {
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run_fs() {
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local -i sclient_success
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local fs_offered=false ecdhe_offered=false ffdhe_offered=false
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local fs_tls13_offered=false
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local fs_tls13_offered=false fs_tls12_offered=false
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local protos_to_try proto hexc dash fs_cipher sslvers auth mac export curve dhlen
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local -a hexcode normalized_hexcode ciph rfc_ciph kx enc ciphers_found sigalg ossl_supported
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# generated from 'kEECDH:kEDH:!aNULL:!eNULL:!DES:!3DES:!RC4' with openssl 1.0.2i and openssl 1.1.0
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@ -10336,10 +10349,16 @@ run_fs() {
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local -a ffdhe_groups_hex=("01,00" "01,01" "01,02" "01,03" "01,04")
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local -a ffdhe_groups_output=("ffdhe2048" "ffdhe3072" "ffdhe4096" "ffdhe6144" "ffdhe8192")
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local -a supported_curve
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local -a sigalgs_hex=("01,01" "01,02" "01,03" "02,01" "02,02" "02,03" "03,01" "03,02" "03,03" "04,01" "04,02" "04,03" "04,20" "05,01" "05,02" "05,03" "05,20" "06,01" "06,02" "06,03" "06,20" "07,08" "08,04" "08,05" "08,06" "08,07" "08,08" "08,09" "08,0a" "08,0b" "08,1a" "08,1b" "08,1c")
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local -a sigalgs_strings=("RSA+MD5" "DSA+MD5" "ECDSA+MD5" "RSA+SHA1" "DSA+SHA1" "ECDSA+SHA1" "RSA+SHA224" "DSA+SHA224" "ECDSA+SHA224" "RSA+SHA256" "DSA+SHA256" "ECDSA+SHA256" "RSA+SHA256" "RSA+SHA384" "DSA+SHA384" "ECDSA+SHA384" "RSA+SHA384" "RSA+SHA512" "DSA+SHA512" "ECDSA+SHA512" "RSA+SHA512" "SM2+SM3" "RSA-PSS+SHA256" "RSA-PSS+SHA384" "RSA-PSS+SHA512" "Ed25519" "Ed448" "RSA-PSS+SHA256" "RSA-PSS+SHA384" "RSA-PSS+SHA512" "ECDSA+SHA256" "ECDSA+SHA384" "ECDSA+SHA512")
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local -a tls13_supported_sigalgs=("false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false")
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local -a tls12_supported_sigalgs=("false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false" "false")
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local rsa_cipher="" ecdsa_cipher="" dss_cipher=""
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local sigalgs_to_test tls12_supported_sigalg_list="" tls13_supported_sigalg_list=""
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local -i nr_supported_ciphers=0 nr_curves=0 nr_ossl_curves=0 i j low high
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local fs_ciphers curves_offered="" curves_to_test temp
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local curves_option="" curves_list1="" curves_list2=""
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local len1 len2 curve_found
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local len1 len2 curve_found sigalg_found
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local key_bitstring quality_str
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local -i len_dh_p quality
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local has_dh_bits="$HAS_DH_BITS"
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@ -10526,6 +10545,9 @@ run_fs() {
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"$WIDE" && kx[i]="$(read_dhtype_from_file $TMPFILE)"
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elif [[ "$fs_cipher" == ECDHE-* ]]; then
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ecdhe_offered=true
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! "$fs_tls12_offered" && [[ "$(get_protocol "$TMPFILE")" == TLSv1.2 ]] && fs_tls12_offered=true
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else
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! "$fs_tls12_offered" && [[ "$(get_protocol "$TMPFILE")" == TLSv1.2 ]] && fs_tls12_offered=true
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fi
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if "$WIDE"; then
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dhlen=$(read_dhbits_from_file "$TMPFILE" quiet)
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@ -10569,6 +10591,12 @@ run_fs() {
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fi
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"$WIDE" && "$SHOW_SIGALGO" && [[ -r "$HOSTCERT" ]] && \
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sigalg[i]="$(read_sigalg_from_file "$HOSTCERT")"
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if [[ "$proto" == 03 ]]; then
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[[ $sclient_success -eq 0 ]] && fs_tls12_offered=true
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elif ! "$fs_tls12_offered" && [[ $sclient_success -eq 2 ]] && \
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[[ "$(get_protocol "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt")" == TLSv1.2 ]]; then
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fs_tls12_offered=true
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fi
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done
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done
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fi
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@ -10861,9 +10889,112 @@ run_fs() {
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else
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fileout "DH_groups" "$quality_str" "$curves_offered"
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fi
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fi
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fi
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outln
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fi
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fi
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if "$using_sockets"; then
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protos_to_try=""
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"$fs_tls13_offered" && protos_to_try="04"
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# For TLS 1.2, find a supported cipher suite corresponding to each of the key types (RSA, ECDSA, DSS).
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# Need to try each key type separately, otherwise not all supported signature algorithms will be found.
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if "$fs_tls12_offered"; then
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for (( i=0; i < nr_supported_ciphers; i++ )); do
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! "${ciphers_found[i]}" && continue
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if [[ -z "$rsa_cipher" ]] && { [[ "${rfc_ciph[i]}" == TLS_DHE_RSA* ]] ||
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[[ "${rfc_ciph[i]}" == TLS_ECDHE_RSA* ]] || [[ "${ciph[i]}" == DHE-RSA-* ]] ||
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[[ "${ciph[i]}" == ECDHE-RSA-* ]]; }; then
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rsa_cipher="${hexcode[i]}"
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elif [[ -z "$ecdsa_cipher" ]] && { [[ "${rfc_ciph[i]}" == TLS_ECDHE_ECDSA* ]] || [[ "${ciph[i]}" == ECDHE-ECDSA-* ]]; }; then
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ecdsa_cipher="${hexcode[i]}"
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elif [[ -z "$dss_cipher" ]] && { [[ "${rfc_ciph[i]}" == TLS_DHE_DSS* ]] || [[ "${ciph[i]}" == DHE-DSS-* ]]; }; then
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dss_cipher="${hexcode[i]}"
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fi
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done
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[[ -n "$rsa_cipher" ]] && protos_to_try+=" 03-$rsa_cipher"
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[[ -n "$ecdsa_cipher" ]] && protos_to_try+=" 03-$ecdsa_cipher"
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[[ -n "$dss_cipher" ]] && protos_to_try+=" 03-$dss_cipher"
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fi
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for proto in $protos_to_try; do
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while true; do
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i=0
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sigalgs_to_test=""
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for hexc in "${sigalgs_hex[@]}"; do
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if [[ "$proto" == 04 ]]; then
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! "${tls13_supported_sigalgs[i]}" && sigalgs_to_test+=", $hexc"
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else
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! "${tls12_supported_sigalgs[i]}" && sigalgs_to_test+=", $hexc"
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fi
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i+=1
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done
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[[ -z "$sigalgs_to_test" ]] && break
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len1=$(printf "%02x" "$((2*${#sigalgs_to_test}/7))")
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len2=$(printf "%02x" "$((2*${#sigalgs_to_test}/7+2))")
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if [[ "$proto" == 04 ]]; then
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tls_sockets "$proto" "$TLS13_CIPHER" "all+" "00,0d, 00,$len2, 00,$len1, ${sigalgs_to_test:2}"
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else
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tls_sockets "${proto%-*}" "${proto#*-}, 00,ff" "ephemeralkey" "00,0d, 00,$len2, 00,$len1, ${sigalgs_to_test:2}"
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fi
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[[ $? -eq 0 ]] || break
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sigalg_found="$(awk -F ': ' '/^Peer signing digest/ { print $2 } ' "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt")"
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[[ -n "$sigalg_found" ]] && sigalg_found="+$sigalg_found"
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sigalg_found="$(awk -F ': ' '/^Peer signature type/ { print $2 } ' "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt")$sigalg_found"
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i=0
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for hexc in "${sigalgs_hex[@]}"; do
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[[ "${sigalgs_strings[i]}" == $sigalg_found ]] && break
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i+=1
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done
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[[ -z "${sigalgs_hex[i]}" ]] && break
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if [[ "$proto" == 04 ]]; then
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"${tls13_supported_sigalgs[i]}" && break
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tls13_supported_sigalgs[i]=true
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tls13_supported_sigalg_list+=" $sigalg_found"
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else
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"${tls12_supported_sigalgs[i]}" && break
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tls12_supported_sigalgs[i]=true
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tls12_supported_sigalg_list+=" $sigalg_found"
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fi
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done
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done
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tls12_supported_sigalg_list="${tls12_supported_sigalg_list:1}"
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tls13_supported_sigalg_list="${tls13_supported_sigalg_list:1}"
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if "$fs_tls12_offered"; then
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pr_bold " TLS 1.2 sig_algs offered: "
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if [[ -z "$(sed -e 's/[A-Za-z\-]*+SHA1//g' -e 's/[A-Za-z\-]*+MD5//g' -e 's/ //g' <<< "$tls12_supported_sigalg_list")" ]]; then
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prln_svrty_critical "$(out_row_aligned_max_width "$tls12_supported_sigalg_list " " " $TERM_WIDTH)"
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fileout "${jsonID}_TLS12_sig_algs" "CRITICAL" "$tls12_supported_sigalg_list"
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else
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out_row_aligned_max_width_by_entry "$tls12_supported_sigalg_list " " " $TERM_WIDTH pr_sigalg_quality
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outln
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if [[ "$tls12_supported_sigalg_list" =~ MD5 ]]; then
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fileout "${jsonID}_TLS12_sig_algs" "HIGH" "$tls12_supported_sigalg_list"
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elif [[ "$tls12_supported_sigalg_list" =~ SHA1 ]]; then
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fileout "${jsonID}_TLS12_sig_algs" "LOW" "$tls12_supported_sigalg_list"
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else
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fileout "${jsonID}_TLS12_sig_algs" "INFO" "$tls12_supported_sigalg_list"
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fi
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fi
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fi
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if "$fs_tls13_offered"; then
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pr_bold " TLS 1.3 sig_algs offered: "
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# If only SHA1 and MD5 signature algorithms are supported, this is a critical finding.
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# If SHA1 and/or MD5 are supported, but stronger algorithms are also supported, the
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# severity is less.
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if [[ -z "$(sed -e 's/[A-Za-z\-]*+SHA1//g' -e 's/[A-Za-z\-]*+MD5//g' -e 's/ //g' <<< "$tls13_supported_sigalg_list")" ]]; then
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prln_svrty_critical "$(out_row_aligned_max_width "$tls13_supported_sigalg_list " " " $TERM_WIDTH)"
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fileout "${jsonID}_TLS13_sig_algs" "CRITICAL" "$tls13_supported_sigalg_list"
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else
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out_row_aligned_max_width_by_entry "$tls13_supported_sigalg_list " " " $TERM_WIDTH pr_sigalg_quality
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outln
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if [[ "$tls13_supported_sigalg_list" =~ MD5 ]]; then
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fileout "${jsonID}_TLS13_sig_algs" "HIGH" "$tls13_supported_sigalg_list"
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elif [[ "$tls13_supported_sigalg_list" =~ SHA1 ]]; then
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fileout "${jsonID}_TLS13_sig_algs" "LOW" "$tls13_supported_sigalg_list"
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else
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fileout "${jsonID}_TLS13_sig_algs" "INFO" "$tls13_supported_sigalg_list"
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fi
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fi
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fi
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fi
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tmpfile_handle ${FUNCNAME[0]}.txt
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"$using_sockets" && HAS_DH_BITS="$has_dh_bits"
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