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Support EdDSA

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This commit adds support for EdDSA (Ed25519 and Ed448). In particular:

* It modifies prepare_tls_clienthello() to include Ed25519 and Ed448 in the signature_algorithms extension of the TLS 1.2 and earlier ClientHello (RFC 8422).

* It modifies run_server_defaults() and get_server_certificate() to check whether the server offers EdDSA certificates with TLS 1.3.

* It modifies certificate_info() to handle certificates signed with EdDSA or with EdDSA public keys, even if $OPENSSL does not support pretty printing such keys and signatures.

* It modifies read_sigalg_from_file() to recognize EdDSA signatures even if $OPENSSL does not.
This commit is contained in:
David Cooper 2020-05-14 14:55:48 -04:00
parent 42386e512b
commit 3ae48931fb
2 changed files with 54 additions and 17 deletions
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1
CHANGELOG.md
View File

@ -16,6 +16,7 @@
* Don't use external pwd anymore
* STARTTLS: XMPP server support
* Rating (SSL Labs, not complete)
* Added support for certificates with EdDSA signatures and pubilc keys
### Features implemented / improvements in 3.0

70
testssl.sh
View File

@ -1040,7 +1040,7 @@ set_key_str_score() {
# TODO: We need to get the size of DH params (follows the same table as the "else" clause)
# For now, verifying the key size will do...
if [[ $type == EC ]]; then
if [[ $type == EC || $type == EdDSA ]]; then
if [[ $size -lt 110 ]] && [[ $KEY_EXCH_SCORE -gt 20 ]]; then
let KEY_EXCH_SCORE=20
set_grade_cap "F" "Using an insecure key"
@ -6249,7 +6249,15 @@ read_dhtype_from_file() {
# arg1: certificate file
read_sigalg_from_file() {
$OPENSSL x509 -noout -text -in "$1" 2>/dev/null | awk -F':' '/Signature Algorithm/ { print $2; exit; }'
local sig_alg
sig_alg="$(strip_leading_space "$($OPENSSL x509 -noout -text -in "$1" 2>/dev/null | awk -F':' '/Signature Algorithm/ { print $2; exit; }')")"
case "$sig_alg" in
1.3.101.112|ED25519) tm_out "Ed25519" ;;
1.3.101.113|ED448) tm_out "Ed448" ;;
*) tm_out "$sig_alg" ;;
esac
}
@ -7547,7 +7555,7 @@ get_server_certificate() {
CERTIFICATE_LIST_ORDERING_PROBLEM=false
if [[ "$1" =~ "tls1_3" ]]; then
[[ $(has_server_protocol "tls1_3") -eq 1 ]] && return 1
if "$HAS_TLS13" && "$HAS_SIGALGS"; then
if "$HAS_TLS13" && "$HAS_SIGALGS" && [[ ! "$1" =~ "tls1_3_EdDSA" ]]; then
if [[ "$1" =~ "tls1_3_RSA" ]]; then
$OPENSSL s_client $(s_client_options "$STARTTLS $BUGS -showcerts -connect $NODEIP:$PORT $PROXY $SNI -tls1_3 -tlsextdebug -status -msg -sigalgs PSS+SHA256:PSS+SHA384") </dev/null 2>$ERRFILE >$TMPFILE
elif [[ "$1" =~ "tls1_3_ECDSA" ]]; then
@ -7568,6 +7576,8 @@ get_server_certificate() {
tls_sockets "04" "$TLS13_CIPHER" "all" "00,12,00,00, 00,05,00,05,01,00,00,00,00, 00,0d,00,10,00,0e,08,04,08,05,08,06,04,01,05,01,06,01,02,01"
elif [[ "$1" =~ "tls1_3_ECDSA" ]]; then
tls_sockets "04" "$TLS13_CIPHER" "all" "00,12,00,00, 00,05,00,05,01,00,00,00,00, 00,0d,00,0a,00,08,04,03,05,03,06,03,02,03"
elif [[ "$1" =~ "tls1_3_EdDSA" ]]; then
tls_sockets "04" "$TLS13_CIPHER" "all" "00,12,00,00, 00,05,00,05,01,00,00,00,00, 00,0d,00,06,00,04,08,07,08,08"
else
return 1
fi
@ -8332,8 +8342,16 @@ certificate_info() {
GOOD_CA_BUNDLE=""
cert_sig_algo="$(awk -F':' '/Signature Algorithm/ { print $2; if (++Match >= 1) exit; }' <<< "$cert_txt")"
cert_sig_algo="${cert_sig_algo// /}"
case "$cert_sig_algo" in
1.3.101.112|ED25519) cert_sig_algo="Ed25519" ;;
1.3.101.113|ED448) cert_sig_algo="Ed448" ;;
esac
cert_key_algo="$(awk -F':' '/Public Key Algorithm:/ { print $2; if (++Match >= 1) exit; }' <<< "$cert_txt")"
cert_key_algo="${cert_key_algo// /}"
case "$cert_key_algo" in
1.3.101.112|E[Dd]25519) cert_key_algo="Ed25519"; cert_keysize=253 ;;
1.3.101.113|E[Dd]448) cert_key_algo="Ed448"; cert_keysize=456 ;;
esac
out "$indent" ; pr_bold " Signature Algorithm "
jsonID="cert_signatureAlgorithm"
@ -8441,6 +8459,10 @@ certificate_info() {
fileout "${jsonID}${json_postfix}" "CRITICAL" "MD5"
set_grade_cap "F" "Supports a insecure signature (MD5)"
;;
Ed25519|Ed448)
prln_svrty_good "$cert_sig_algo"
fileout "${jsonID}${json_postfix}" "OK" "$cert_sig_algo"
;;
*)
out "$cert_sig_algo ("
pr_warning "FIXME: can't tell whether this is good or not"
@ -8461,6 +8483,7 @@ certificate_info() {
case $cert_key_algo in
*RSA*|*rsa*) short_keyAlgo="RSA";;
*ecdsa*|*ecPublicKey) short_keyAlgo="EC";;
*Ed25519*|*Ed448*) short_keyAlgo="EdDSA";;
*DSA*|*dsa*) short_keyAlgo="DSA";;
*GOST*|*gost*) short_keyAlgo="GOST";;
*dh*|*DH*) short_keyAlgo="DH" ;;
@ -8523,6 +8546,10 @@ certificate_info() {
((ret++))
fi
set_key_str_score "$short_keyAlgo" "$cert_keysize"
elif [[ $cert_key_algo == Ed* ]]; then
pr_svrty_good "$cert_key_algo"
json_rating="OK"; json_msg="$short_keyAlgo $cert_key_algo"
set_key_str_score "$short_keyAlgo" "$cert_keysize"
else
out "$cert_key_algo + $cert_keysize bits ("
@ -8586,7 +8613,7 @@ certificate_info() {
cert_keyusage="$(strip_leading_space "$(awk '/X509v3 Key Usage:/ { getline; print $0 }' <<< "$cert_txt")")"
if [[ -n "$cert_keyusage" ]]; then
outln "$cert_keyusage"
if ( [[ " $cert_type " =~ " RSASig " ]] || [[ " $cert_type " =~ " DSA " ]] || [[ " $cert_type " =~ " ECDSA " ]] ) && \
if ( [[ " $cert_type " =~ " RSASig " ]] || [[ " $cert_type " =~ " DSA " ]] || [[ " $cert_type " =~ " ECDSA " ]] || [[ " $cert_type " =~ " EdDSA " ]] ) && \
[[ ! "$cert_keyusage" =~ "Digital Signature" ]]; then
prln_svrty_high "$indent Certificate incorrectly used for digital signatures"
fileout "${jsonID}${json_postfix}" "HIGH" "Certificate incorrectly used for digital signatures: \"$cert_keyusage\""
@ -9257,27 +9284,28 @@ run_server_defaults() {
ciphers_to_test[7]=""
ciphers_to_test[8]="tls1_3_RSA"
ciphers_to_test[9]="tls1_3_ECDSA"
ciphers_to_test[10]="tls1_3_EdDSA"
certificate_type[1]="" ; certificate_type[2]=""
certificate_type[3]=""; certificate_type[4]=""
certificate_type[5]="" ; certificate_type[6]=""
certificate_type[7]="" ; certificate_type[8]="RSASig"
certificate_type[9]="ECDSA"
certificate_type[9]="ECDSA" ; certificate_type[10]="EdDSA"
for (( n=1; n <= 16 ; n++ )); do
for (( n=1; n <= 17 ; n++ )); do
# Some servers use a different certificate if the ClientHello
# specifies TLSv1.1 and doesn't include a server name extension.
# So, for each public key type for which a certificate was found,
# try again, but only with TLSv1.1 and without SNI.
if [[ $n -ne 1 ]] && [[ "$OPTIMAL_PROTO" == -ssl2 ]]; then
ciphers_to_test[n]=""
elif [[ $n -ge 10 ]]; then
elif [[ $n -ge 11 ]]; then
ciphers_to_test[n]=""
[[ ${success[n-9]} -eq 0 ]] && [[ $(has_server_protocol "tls1_1") -ne 1 ]] && \
ciphers_to_test[n]="${ciphers_to_test[n-9]}" && certificate_type[n]="${certificate_type[n-9]}"
[[ ${success[n-10]} -eq 0 ]] && [[ $(has_server_protocol "tls1_1") -ne 1 ]] && \
ciphers_to_test[n]="${ciphers_to_test[n-10]}" && certificate_type[n]="${certificate_type[n-10]}"
fi
if [[ -n "${ciphers_to_test[n]}" ]]; then
if [[ $n -ge 10 ]]; then
if [[ $n -ge 11 ]]; then
sni="$SNI"
SNI=""
get_server_certificate "${ciphers_to_test[n]}" "tls1_1"
@ -9288,7 +9316,7 @@ run_server_defaults() {
success[n]=$?
fi
if [[ ${success[n]} -eq 0 ]] && [[ -s "$HOSTCERT" ]]; then
[[ $n -ge 10 ]] && [[ ! -e $HOSTCERT.nosni ]] && cp $HOSTCERT $HOSTCERT.nosni
[[ $n -ge 11 ]] && [[ ! -e $HOSTCERT.nosni ]] && cp $HOSTCERT $HOSTCERT.nosni
cp "$TEMPDIR/$NODEIP.get_server_certificate.txt" $TMPFILE
>$ERRFILE
if [[ -z "$sessticket_lifetime_hint" ]]; then
@ -9370,7 +9398,7 @@ run_server_defaults() {
fi
i=$((i + 1))
done
if ! "$match_found" && [[ $n -ge 10 ]] && [[ $certs_found -ne 0 ]]; then
if ! "$match_found" && [[ $n -ge 11 ]] && [[ $certs_found -ne 0 ]]; then
# A new certificate was found using TLSv1.1 without SNI.
# Check to see if the new certificate should be displayed.
# It should be displayed if it is either a match for the
@ -9427,7 +9455,7 @@ run_server_defaults() {
[[ -n "${previous_intermediates[certs_found]}" ]] && [[ -r $TEMPDIR/hostcert_issuer.pem ]] && \
previous_hostcert_issuer[certs_found]=$(cat $TEMPDIR/hostcert_issuer.pem)
previous_ordering_problem[certs_found]=$CERTIFICATE_LIST_ORDERING_PROBLEM
[[ $n -ge 10 ]] && sni_used[certs_found]="" || sni_used[certs_found]="$SNI"
[[ $n -ge 11 ]] && sni_used[certs_found]="" || sni_used[certs_found]="$SNI"
tls_version[certs_found]="$DETECTED_TLS_VERSION"
previous_hostcert_type[certs_found]=" ${certificate_type[n]}"
if [[ $DEBUG -ge 1 ]]; then
@ -10738,7 +10766,15 @@ get_pub_key_size() {
"$HAS_PKEY" || return 1
# OpenSSL displays the number of bits for RSA and ECC
pubkeybits=$($OPENSSL x509 -noout -pubkey -in $HOSTCERT 2>>$ERRFILE | $OPENSSL pkey -pubin -text 2>>$ERRFILE | awk -F'(' '/Public-Key/ { print $2 }')
pubkeybits=$($OPENSSL x509 -noout -pubkey -in $HOSTCERT 2>>$ERRFILE | $OPENSSL pkey -pubin -text 2>>$ERRFILE)
if [[ "$pubkeybits" =~ E[Dd]25519 ]]; then
echo "Server public key is 253 bit" >> $TMPFILE
return 0
elif [[ "$pubkeybits" =~ E[Dd]448 ]]; then
echo "Server public key is 456 bit" >> $TMPFILE
return 0
fi
pubkeybits=$(awk -F'(' '/Public-Key/ { print $2 }' <<< "$pubkeybits")
if [[ -n $pubkeybits ]]; then
# remainder e.g. "256 bit)"
pubkeybits="${pubkeybits//\)/}"
@ -14279,10 +14315,10 @@ prepare_tls_clienthello() {
if [[ 0x$tls_low_byte -le 0x03 ]]; then
extension_signature_algorithms="
00, 0d, # Type: signature_algorithms , see RFC 5246
00, 20, 00,1e, # lengths
00, 0d, # Type: signature_algorithms , see RFC 5246 and RFC 8422
00, 24, 00,22, # lengths
06,01, 06,02, 06,03, 05,01, 05,02, 05,03, 04,01, 04,02, 04,03,
03,01, 03,02, 03,03, 02,01, 02,02, 02,03"
03,01, 03,02, 03,03, 02,01, 02,02, 02,03, 08,07, 08,08"
else
extension_signature_algorithms="
00, 0d, # Type: signature_algorithms , see RFC 8446