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Check keyUsage and extended key usage extensions

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This commit prints the contents of the keyUsage and extended key usage extensions in certificates and checks the public keys in the certificates are not being used in a manner that is inconsistent with these extensions.
This commit is contained in:
David Cooper 2018-01-19 11:31:45 -05:00 committed by David Cooper
parent 7a10e5514f
commit f0c9875696
1 changed files with 47 additions and 9 deletions
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56
testssl.sh
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@ -6346,11 +6346,12 @@ certificate_info() {
local -i number_of_certificates=$2
local cipher=$3
local cert_keysize=$4
local ocsp_response=$5
local ocsp_response_status=$6
local sni_used=$7
local ct="$8"
local cert_sig_algo cert_sig_hash_algo cert_key_algo
local cert_type="$5"
local ocsp_response=$6
local ocsp_response_status=$7
local sni_used=$8
local ct="$9"
local cert_sig_algo cert_sig_hash_algo cert_key_algo cert_keyusage cert_ext_keyusage
local expire days2expire secs2warn ocsp_uri crl
local startdate enddate issuer_CN issuer_C issuer_O issuer sans san all_san="" cn
local issuer_DC issuerfinding cn_nosni=""
@ -6568,6 +6569,36 @@ certificate_info() {
fi
fi
out "$indent"; pr_bold " Server key usage ";
cert_keyusage=$($OPENSSL x509 -text -noout -in $HOSTCERT 2>>$ERRFILE | grep -A 1 "X509v3 Key Usage:" | tail -n +2 | sed 's/^[ \t]*//')
if [[ -n "$cert_keyusage" ]]; then
outln "$cert_keyusage"
if ( [[ " $cert_type " =~ " RSASig " ]] || [[ " $cert_type " =~ " DSA " ]] || [[ " $cert_type " =~ " ECDSA " ]] ) && \
[[ ! "$cert_keyusage" =~ "Digital Signature" ]]; then
prln_svrty_high "$indent -- certificate incorrectly used for digital signatures"
fi
if [[ " $cert_type " =~ " RSAKMK " ]] && [[ ! "$cert_keyusage" =~ "Key Encipherment" ]]; then
prln_svrty_high "$indent -- certificate incorrectly used for key encipherment"
fi
if ( [[ " $cert_type " =~ " DH " ]] || [[ " $cert_type " =~ " ECDH " ]] ) && \
[[ ! "$cert_keyusage" =~ "Key Agreement" ]]; then
prln_svrty_high "$indent -- certificate incorrectly used for key agreement"
fi
else
outln "(absent)"
fi
out "$indent"; pr_bold " Server extended key usage ";
cert_ext_keyusage="$($OPENSSL x509 -noout -text -in $HOSTCERT 2>>$ERRFILE | grep -A 1 "X509v3 Extended Key Usage: " | tail -1 | sed 's/^[ \t]*//')"
if [[ -n "$cert_ext_keyusage" ]]; then
outln "$cert_ext_keyusage"
if [[ ! "$cert_ext_keyusage" =~ "TLS Web Server Authentication" ]] && [[ ! "$cert_ext_keyusage" =~ "Any Extended Key Usage" ]]; then
prln_svrty_high "$indent -- certificate incorrectly used for TLS Web Server Authentication"
fi
else
outln "(absent)"
fi
out "$indent"; pr_bold " Fingerprint / Serial "
cert_fingerprint_sha1="$($OPENSSL x509 -noout -in $HOSTCERT -fingerprint -sha1 2>>$ERRFILE | sed 's/Fingerprint=//' | sed 's/://g')"
cert_fingerprint_serial="$($OPENSSL x509 -noout -in $HOSTCERT -serial 2>>$ERRFILE | sed 's/serial=//')"
@ -7005,9 +7036,9 @@ run_server_defaults() {
local sessticket_lifetime_hint="" lifetime unit
local -i i n
local -i certs_found=0
local -a previous_hostcert previous_intermediates keysize cipher
local -a previous_hostcert previous_hostcert_type previous_intermediates keysize cipher
local -a ocsp_response ocsp_response_status sni_used tls_version ct
local -a ciphers_to_test
local -a ciphers_to_test certificate_type
local -a -i success
local cn_nosni cn_sni sans_nosni sans_sni san tls_extensions
@ -7035,6 +7066,10 @@ run_server_defaults() {
ciphers_to_test[5]="aECDH"
ciphers_to_test[6]="aECDSA"
ciphers_to_test[7]="aGOST"
certificate_type[1]="RSASig" ; certificate_type[2]="RSAKMK"
certificate_type[3]="DSA"; certificate_type[4]="DH"
certificate_type[5]="ECDH" ; certificate_type[6]="ECDSA"
certificate_type[7]="GOST"
for (( n=1; n <= 14 ; n++ )); do
# Some servers use a different certificate if the ClientHello
@ -7043,7 +7078,7 @@ run_server_defaults() {
# try again, but only with TLSv1.1 and without SNI.
if [[ $n -ge 8 ]]; then
ciphers_to_test[n]=""
[[ ${success[n-7]} -eq 0 ]] && ciphers_to_test[n]="${ciphers_to_test[n-7]}"
[[ ${success[n-7]} -eq 0 ]] && ciphers_to_test[n]="${ciphers_to_test[n-7]}" && certificate_type[n]="${certificate_type[n-7]}"
fi
if [[ -n "${ciphers_to_test[n]}" ]] && [[ $(count_ciphers $($OPENSSL ciphers "${ciphers_to_test[n]}" 2>>$ERRFILE)) -ge 1 ]]; then
@ -7129,6 +7164,9 @@ run_server_defaults() {
previous_intermediates[certs_found]=$(cat $TEMPDIR/intermediatecerts.pem)
[[ $n -ge 8 ]] && sni_used[certs_found]="" || sni_used[certs_found]="$SNI"
tls_version[certs_found]="$DETECTED_TLS_VERSION"
previous_hostcert_type[certs_found]=" ${certificate_type[n]}"
else
previous_hostcert_type[i]+=" ${certificate_type[n]}"
fi
fi
fi
@ -7260,7 +7298,7 @@ run_server_defaults() {
for (( i=1; i <= certs_found; i++ )); do
echo "${previous_hostcert[i]}" > $HOSTCERT
echo "${previous_intermediates[i]}" > $TEMPDIR/intermediatecerts.pem
certificate_info "$i" "$certs_found" "${cipher[i]}" "${keysize[i]}" "${ocsp_response[i]}" "${ocsp_response_status[i]}" "${sni_used[i]}" "${ct[i]}"
certificate_info "$i" "$certs_found" "${cipher[i]}" "${keysize[i]}" "${previous_hostcert_type[i]}" "${ocsp_response[i]}" "${ocsp_response_status[i]}" "${sni_used[i]}" "${ct[i]}"
done
}