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Merge pull request #2265 from dcooper16/server_sig_algs
Show server supported signature algorithms
This commit is contained in:
Dirk Wetter
GitHub
commit
a4666087e8
@ -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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158
testssl.sh
158
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 +10889,131 @@ 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="04-01 04-02"
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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 "$rsa_cipher" ]] && protos_to_try+=" 03-rsa-$rsa_cipher"
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[[ -n "$ecdsa_cipher" ]] && protos_to_try+=" 03-ecdsa-$ecdsa_cipher"
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[[ -n "$dss_cipher" ]] && protos_to_try+=" 03-dss-$dss_cipher"
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fi
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for proto in $protos_to_try; do
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while true; do
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i=0
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sigalgs_to_test=""
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# A few servers get confused if the signature_algorithms extension contains too many entries. So:
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# * For TLS 1.3, break the list into two and test each half separately.
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# * For TLS 1.2, generally limit the signature_algorithms extension to algorithms that are consistent with the key type.
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for hexc in "${sigalgs_hex[@]}"; do
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if [[ "$proto" == 04* ]]; then
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if ! "${tls13_supported_sigalgs[i]}"; then
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if [[ "${proto##*-}" == 01 ]]; then
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[[ $i -le 16 ]] && sigalgs_to_test+=", $hexc"
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else
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[[ $i -gt 16 ]] && sigalgs_to_test+=", $hexc"
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fi
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fi
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elif ! "${tls12_supported_sigalgs[i]}"; then
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if [[ "$proto" =~ rsa ]]; then
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if [[ "${hexc:3:2}" == 01 ]] || [[ "${hexc:0:2}" == 08 ]]; then
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sigalgs_to_test+=", $hexc"
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fi
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elif [[ "$proto" =~ dss ]]; then
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[[ "${hexc:3:2}" == 02 ]] && sigalgs_to_test+=", $hexc"
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else
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if [[ "${hexc:3:2}" == 03 ]] || [[ "${hexc:0:2}" == 08 ]]; then
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sigalgs_to_test+=", $hexc"
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fi
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fi
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fi
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i+=1
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done
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[[ -z "$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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