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https://github.com/mozilla/cipherscan.git
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add caching of intermediate CA certificates
This commit is contained in:
Hubert Kario
Hubert Kario
parent
3b14cd914f
commit
826f7b5541
94
cipherscan
94
cipherscan
@ -57,7 +57,7 @@ ratelimit() {
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}
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usage() {
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echo -e "usage: $0 [-a|--allciphers] [-b|--benchmark] [--capath directory] [-d|--delay seconds] [-D|--debug] [-j|--json] [-v|--verbose] [-o|--openssl file] [openssl s_client args] <target:port>
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echo -e "usage: $0 [-a|--allciphers] [-b|--benchmark] [--capath directory] [--saveca] [-d|--delay seconds] [-D|--debug] [-j|--json] [-v|--verbose] [-o|--openssl file] [openssl s_client args] <target:port>
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usage: $0 -h|--help
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$0 attempts to connect to a target site using all the ciphersuites it knows.
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@ -71,7 +71,8 @@ Use one of the options below:
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-a | --allciphers Test all known ciphers individually at the end.
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-b | --benchmark Activate benchmark mode.
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--capath use CAs from directory
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--capath use CAs from directory (must be in OpenSSL CAdir format)
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--saveca save intermediate certificates in CA directory
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-d | --delay Pause for n seconds between connections
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-D | --debug Output ALL the information.
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-h | --help Shows this help text.
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@ -99,6 +100,23 @@ debug(){
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fi
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}
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c_hash() {
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local h=$(${OPENSSLBIN} x509 -hash -noout -in "$1/$2" 2>/dev/null)
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for num in $(seq 0 100); do
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if [[ $1/${h}.${num} -ef $2 ]]; then
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# file already linked, ignore
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break
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fi
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if [[ ! -e $1/${h}.${num} ]]; then
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# file doesn't exist, create a link
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pushd "$1" > /dev/null
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ln -s "$2" "${h}.${num}"
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popd > /dev/null
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break
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fi
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done
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}
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# Connect to a target host with the selected ciphersuite
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test_cipher_on_target() {
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local sslcommand=$@
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@ -107,6 +125,7 @@ test_cipher_on_target() {
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protocols=""
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pfs=""
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previous_cipher=""
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certificates=""
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for tls_version in "-ssl2" "-ssl3" "-tls1" "-tls1_1" "-tls1_2"
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do
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# sslv2 client hello doesn't support SNI extension
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@ -154,6 +173,63 @@ test_cipher_on_target() {
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current_sigalg=None
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fi
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# collect certificate data
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current_certificates=""
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local certificate_count=$(grep --count -- '-----END CERTIFICATE-----'\
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<<<"$tmp")
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debug "server presented $certificate_count certificates"
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local i
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for ((i=0; i<$certificate_count; i=i+1 )); do
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# extract i'th certificate
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local cert=$(awk -v i=$i 'split_after == 1 {n++;split_after=0}
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/-----END CERTIFICATE-----/ {split_after=1}
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{if (n == i) print }
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' <<<"$tmp")
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# compute sha256 fingerprint of the certificate
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local sha256sum=$(${OPENSSLBIN} x509 -outform DER <<<"$cert" 2>/dev/null |\
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${OPENSSLBIN} dgst -sha256 -r 2>/dev/null| awk '{print $1}')
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# check if it is a CA certificate
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local isCA="False"
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if ${OPENSSLBIN} x509 -noout -text <<<"$cert" 2>/dev/null |\
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grep 'CA:TRUE' >/dev/null; then
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isCA="True"
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fi
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# build trust source for certificate verification
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local trust_source=()
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if [[ -n $CAPATH ]]; then
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trust_source=("-CApath" "$CAPATH")
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elif [[ -e $CACERTS ]]; then
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trust_source=("-CAfile" "$CACERTS")
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fi
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# check if the certificate is actually trusted (server may present
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# unrelated certificates that are not trusted (including self
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# signed ones)
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if ${OPENSSLBIN} verify "${trust_source[@]}" \
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-untrusted <(echo "$tmp") <(echo "$cert") 2>/dev/null | \
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grep 'OK$' >/dev/null; then
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# if the certificate is an intermediate CA it may be useful
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# for connecting to servers that are misconfigured so save it
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if [[ -n $CAPATH ]] && [[ $SAVECA == "True" ]] && [[ $isCA == "True" ]]; then
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if [[ ! -e "$CAPATH/${sha256sum}.pem" ]]; then
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echo "$cert" > "$CAPATH/${sha256sum}.pem"
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c_hash "$CAPATH" "${sha256sum}.pem"
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fi
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fi
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fi
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# save the sha sum for reporting
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if [ -n "${current_certificates}" ]; then
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current_certificates+=","
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fi
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current_certificates+="\"${sha256sum}\""
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done
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debug "current_certificates: $current_certificates"
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# parsing finished, report result
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if [[ -z "$current_protocol" || "$current_cipher" == '(NONE)' ]]; then
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# connection failed, try again with next TLS version
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@ -180,6 +256,7 @@ test_cipher_on_target() {
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trusted=$current_trusted
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tickethint=$current_tickethint
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ocspstaple=$current_ocspstaple
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certificates="$current_certificates"
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# grab the cipher and PFS key size
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done
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# if cipher is empty, that means none of the TLS version worked with
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@ -231,7 +308,7 @@ get_cipher_pref() {
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local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
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if [ -n "$CAPATH" ]; then
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sslcommand+=" -CApath $CAPATH"
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sslcommand+=" -CApath $CAPATH -showcerts"
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elif [ -e $CACERTS ]; then
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sslcommand+=" -CAfile $CACERTS"
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fi
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@ -243,6 +320,7 @@ get_cipher_pref() {
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# If the connection succeeded with the current cipher, benchmark and store
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if [ $success -eq 0 ]; then
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cipherspref=("${cipherspref[@]}" "$result")
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ciphercertificates=("${ciphercertificates[@]}" "$certificates")
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pciph=$(echo $result|awk '{print $1}')
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get_cipher_pref "!$pciph:$ciphersuite"
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return 0
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@ -349,6 +427,9 @@ display_results_in_json() {
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echo -n "\"pubkey\":[\"$(echo $cipher|awk '{print $3}'|sed 's/,/","/g')\"],"
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echo -n "\"sigalg\":[\"$(echo $cipher|awk '{print $4}'|sed 's/,/","/g')\"],"
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echo -n "\"trusted\":\"$(echo $cipher|awk '{print $5}'|sed 's/,/","/g')\","
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if [[ -n $CAPATH ]]; then
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echo -n "\"certificates\":[${ciphercertificates[$ctr]}],"
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fi
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echo -n "\"ticket_hint\":\"$(echo $cipher|awk '{print $6}')\","
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echo -n "\"ocsp_stapling\":\"$(echo $cipher|awk '{print $7}')\","
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pfs=$(echo $cipher|awk '{print $8}')
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@ -393,7 +474,7 @@ test_serverside_ordering() {
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local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
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if [ -n "$CAPATH" ]; then
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sslcommand+=" -CApath $CAPATH"
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sslcommand+=" -CApath $CAPATH -showcerts"
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elif [ -e "$CACERTS" ]; then
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sslcommand+=" -CAfile $CACERTS"
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fi
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@ -453,6 +534,10 @@ do
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CAPATH="$2"
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shift 2
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;;
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--saveca)
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SAVECA="True"
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shift 1
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;;
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--) # End of all options
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shift
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break
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@ -505,6 +590,7 @@ debug "sclientargs: $SCLIENTARGS"
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cipherspref=();
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ciphercertificates=()
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results=()
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# Call to the recursive loop that retrieves the cipher preferences
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