Common primes test phase 1
In response to your request in #572, this PR provides a starting point for addressing #120. It adds code to `run_logjam()` to try connecting to the server using any cipher that uses an ephemeral DH key. If successful, it gets the server's ephemeral key (in OpenSSL's PEM format) and then extracts the prime from the key and places it in `$dh_p`. So, all that needs to be done at this point is to compare `$dh_p` against a set of "bad" primes. I'm not sure if I'll be able to work on that part soon, so if someone else has the time, that would be great. I actually found the `-msg` option easy to use. I moved the code in `parse_tls_serverhello()` that extracts the DH ephemeral public key from the ServerKeyExchange message into a separate function. Then, if using OpenSSL with the `-msg` option, I extract the ServerKeyExchange message from `$TMPFILE` and call this new function to extract the key and convert it to PEM format. That way the new code in `run_logjam()` can use either `$OPENSSL` or `tls_sockets()`.
This commit is contained in:
David Cooper
GitHub
parent
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commit
ec3a644c4d
320
testssl.sh
320
testssl.sh
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@ -6830,6 +6830,159 @@ get_pub_key_size() {
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return 0
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return 0
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}
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}
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# Extract the DH ephemeral key from the ServerKeyExchange message
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get_dh_ephemeralkey() {
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local tls_serverkeyexchange_ascii="$1"
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local -i tls_serverkeyexchange_ascii_len offset
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local dh_p dh_g dh_y dh_param len1 key_bitstring tmp_der_key_file
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local -i i dh_p_len dh_g_len dh_y_len dh_param_len
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tls_serverkeyexchange_ascii_len=${#tls_serverkeyexchange_ascii}
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dh_p_len=2*$(hex2dec "${tls_serverkeyexchange_ascii:0:4}")
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offset=4+$dh_p_len
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if [[ $tls_serverkeyexchange_ascii_len -lt $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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return 1
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fi
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# Subtract any leading 0 bytes
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for (( i=4; i < offset; i=i+2 )); do
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[[ "${tls_serverkeyexchange_ascii:i:2}" != "00" ]] && break
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dh_p_len=$dh_p_len-2
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done
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if [[ $i -ge $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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return 1
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fi
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dh_p="${tls_serverkeyexchange_ascii:i:dh_p_len}"
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dh_g_len=2*$(hex2dec "${tls_serverkeyexchange_ascii:offset:4}")
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i=4+$offset
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offset+=4+$dh_g_len
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if [[ $tls_serverkeyexchange_ascii_len -lt $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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return 1
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fi
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# Subtract any leading 0 bytes
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for (( 1; i < offset; i=i+2 )); do
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[[ "${tls_serverkeyexchange_ascii:i:2}" != "00" ]] && break
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dh_g_len=$dh_g_len-2
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done
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if [[ $i -ge $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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return 1
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fi
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dh_g="${tls_serverkeyexchange_ascii:i:dh_g_len}"
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dh_y_len=2*$(hex2dec "${tls_serverkeyexchange_ascii:offset:4}")
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i=4+$offset
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offset+=4+$dh_y_len
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if [[ $tls_serverkeyexchange_ascii_len -lt $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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return 1
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fi
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# Subtract any leading 0 bytes
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for (( 1; i < offset; i=i+2 )); do
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[[ "${tls_serverkeyexchange_ascii:i:2}" != "00" ]] && break
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dh_y_len=$dh_y_len-2
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done
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if [[ $i -ge $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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return 1
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fi
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dh_y="${tls_serverkeyexchange_ascii:i:dh_y_len}"
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# The following code assumes that all lengths can be encoded using at most 2 bytes,
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# which just means that the encoded length of the public key must be less than
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# 65,536 bytes. If the length is anywhere close to that, it is almost certainly an
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# encoding error.
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if [[ $dh_p_len+$dh_g_len+$dh_y_len -ge 131000 ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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return 1
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fi
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# make ASN.1 INTEGER of p, g, and Y
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[[ "0x${dh_p:0:1}" -ge 8 ]] && dh_p_len+=2 && dh_p="00$dh_p"
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if [[ $dh_p_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_p_len/2)))"
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elif [[ $dh_p_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_p_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_p_len/2)))"
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fi
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dh_p="02${len1}$dh_p"
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[[ "0x${dh_g:0:1}" -ge 8 ]] && dh_g_len+=2 && dh_g="00$dh_g"
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if [[ $dh_g_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_g_len/2)))"
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elif [[ $dh_g_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_g_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_g_len/2)))"
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fi
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dh_g="02${len1}$dh_g"
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[[ "0x${dh_y:0:1}" -ge 8 ]] && dh_y_len+=2 && dh_y="00$dh_y"
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if [[ $dh_y_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_y_len/2)))"
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elif [[ $dh_y_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_y_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_y_len/2)))"
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fi
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dh_y="02${len1}$dh_y"
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# Make a SEQUENCE of p and g
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dh_param_len=${#dh_p}+${#dh_g}
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if [[ $dh_param_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_param_len/2)))"
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elif [[ $dh_param_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_param_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_param_len/2)))"
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fi
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dh_param="30${len1}${dh_p}${dh_g}"
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# Make a SEQUENCE of the paramters SEQUENCE and the OID
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dh_param_len=22+${#dh_param}
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if [[ $dh_param_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_param_len/2)))"
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elif [[ $dh_param_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_param_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_param_len/2)))"
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fi
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dh_param="30${len1}06092A864886F70D010301${dh_param}"
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# Encapsulate public key, y, in a BIT STRING
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dh_y_len=${#dh_y}+2
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if [[ $dh_y_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_y_len/2)))"
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elif [[ $dh_y_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_y_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_y_len/2)))"
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fi
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dh_y="03${len1}00$dh_y"
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# Create the public key SEQUENCE
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i=${#dh_param}+${#dh_y}
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if [[ $i -lt 256 ]]; then
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len1="$(printf "%02x" $((i/2)))"
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elif [[ $i -lt 512 ]]; then
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len1="81$(printf "%02x" $((i/2)))"
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else
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len1="82$(printf "%04x" $((i/2)))"
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fi
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key_bitstring="30${len1}${dh_param}${dh_y}"
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tmp_der_key_file=$(mktemp $TEMPDIR/pub_key_der.XXXXXX) || return 1
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asciihex_to_binary_file "$key_bitstring" "$tmp_der_key_file"
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key_bitstring="$($OPENSSL pkey -pubin -in $tmp_der_key_file -inform DER 2> $ERRFILE)"
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rm $tmp_der_key_file
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[[ -z "$key_bitstring" ]] && return 1
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out "$key_bitstring"
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return 0
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}
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# arg1: name of file with socket reply
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# arg1: name of file with socket reply
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# arg2: true if entire server hello should be parsed
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# arg2: true if entire server hello should be parsed
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parse_sslv2_serverhello() {
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parse_sslv2_serverhello() {
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@ -7032,9 +7185,9 @@ parse_tls_serverhello() {
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local -i curve_type named_curve
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local -i curve_type named_curve
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local -i dh_bits=0 msb mask
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local -i dh_bits=0 msb mask
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local tmp_der_certfile tmp_pem_certfile hostcert_issuer="" ocsp_response=""
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local tmp_der_certfile tmp_pem_certfile hostcert_issuer="" ocsp_response=""
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local len1 key_bitstring="" tmp_der_key_file
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local key_bitstring=""
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local dh_p dh_g dh_y dh_param ephemeral_param rfc7919_param
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local dh_p ephemeral_param rfc7919_param
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local -i dh_p_len dh_g_len dh_y_len dh_param_len
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local -i dh_p_len
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TLS_TIME=""
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TLS_TIME=""
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DETECTED_TLS_VERSION=""
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DETECTED_TLS_VERSION=""
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@ -7735,134 +7888,8 @@ parse_tls_serverhello() {
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dh_bits=$dh_bits-1
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dh_bits=$dh_bits-1
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done
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done
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dh_g_len=2*$(hex2dec "${tls_serverkeyexchange_ascii:offset:4}")
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key_bitstring="$(get_dh_ephemeralkey "$tls_serverkeyexchange_ascii")"
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i=4+$offset
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[[ $? -eq 0 ]] && echo "$key_bitstring" >> $TMPFILE
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offset+=4+$dh_g_len
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if [[ $tls_serverkeyexchange_ascii_len -lt $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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tmpfile_handle $FUNCNAME.txt
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return 1
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fi
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# Subtract any leading 0 bytes
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for (( 1; i < offset; i=i+2 )); do
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[[ "${tls_serverkeyexchange_ascii:i:2}" != "00" ]] && break
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dh_g_len=$dh_g_len-2
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done
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if [[ $i -ge $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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tmpfile_handle $FUNCNAME.txt
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return 1
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fi
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dh_g="${tls_serverkeyexchange_ascii:i:dh_g_len}"
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dh_y_len=2*$(hex2dec "${tls_serverkeyexchange_ascii:offset:4}")
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i=4+$offset
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offset+=4+$dh_y_len
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if [[ $tls_serverkeyexchange_ascii_len -lt $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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tmpfile_handle $FUNCNAME.txt
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return 1
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fi
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# Subtract any leading 0 bytes
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for (( 1; i < offset; i=i+2 )); do
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[[ "${tls_serverkeyexchange_ascii:i:2}" != "00" ]] && break
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dh_y_len=$dh_y_len-2
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done
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if [[ $i -ge $offset ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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tmpfile_handle $FUNCNAME.txt
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return 1
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fi
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dh_y="${tls_serverkeyexchange_ascii:i:dh_y_len}"
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# The following code assumes that all lengths can be encoded using at most 2 bytes,
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# which just means that the encoded length of the public key must be less than
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# 65,536 bytes. If the length is anywhere close to that, it is almost certainly an
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# encoding error.
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if [[ $dh_p_len+$dh_g_len+$dh_y_len -ge 131000 ]]; then
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debugme echo "Malformed ServerKeyExchange Handshake message in ServerHello."
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tmpfile_handle $FUNCNAME.txt
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return 1
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fi
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# make ASN.1 INTEGER of p, g, and Y
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[[ "0x${dh_p:0:1}" -ge 8 ]] && dh_p_len+=2 && dh_p="00$dh_p"
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if [[ $dh_p_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_p_len/2)))"
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elif [[ $dh_p_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_p_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_p_len/2)))"
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fi
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dh_p="02${len1}$dh_p"
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[[ "0x${dh_g:0:1}" -ge 8 ]] && dh_g_len+=2 && dh_g="00$dh_g"
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if [[ $dh_g_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_g_len/2)))"
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elif [[ $dh_g_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_g_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_g_len/2)))"
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fi
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dh_g="02${len1}$dh_g"
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[[ "0x${dh_y:0:1}" -ge 8 ]] && dh_y_len+=2 && dh_y="00$dh_y"
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if [[ $dh_y_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_y_len/2)))"
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elif [[ $dh_y_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_y_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_y_len/2)))"
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fi
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dh_y="02${len1}$dh_y"
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# Make a SEQUENCE of p and g
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dh_param_len=${#dh_p}+${#dh_g}
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if [[ $dh_param_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_param_len/2)))"
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elif [[ $dh_param_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_param_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_param_len/2)))"
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fi
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dh_param="30${len1}${dh_p}${dh_g}"
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# Make a SEQUENCE of the paramters SEQUENCE and the OID
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dh_param_len=22+${#dh_param}
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if [[ $dh_param_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_param_len/2)))"
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elif [[ $dh_param_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_param_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_param_len/2)))"
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fi
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dh_param="30${len1}06092A864886F70D010301${dh_param}"
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# Encapsulate public key, y, in a BIT STRING
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dh_y_len=${#dh_y}+2
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if [[ $dh_y_len -lt 256 ]]; then
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len1="$(printf "%02x" $((dh_y_len/2)))"
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elif [[ $dh_y_len -lt 512 ]]; then
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len1="81$(printf "%02x" $((dh_y_len/2)))"
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else
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len1="82$(printf "%04x" $((dh_y_len/2)))"
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fi
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dh_y="03${len1}00$dh_y"
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# Create the public key SEQUENCE
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i=${#dh_param}+${#dh_y}
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if [[ $i -lt 256 ]]; then
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len1="$(printf "%02x" $((i/2)))"
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elif [[ $i -lt 512 ]]; then
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len1="81$(printf "%02x" $((i/2)))"
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else
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len1="82$(printf "%04x" $((i/2)))"
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fi
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key_bitstring="30${len1}${dh_param}${dh_y}"
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tmp_der_key_file=$(mktemp $TEMPDIR/pub_key_der.XXXXXX) || return 1
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asciihex_to_binary_file "$key_bitstring" "$tmp_der_key_file"
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key_bitstring="$($OPENSSL pkey -pubin -in $tmp_der_key_file -inform DER 2> $ERRFILE)"
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rm $tmp_der_key_file
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[[ -n "$key_bitstring" ]] && echo "$key_bitstring" >> $TMPFILE
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# Check to see whether the ephemeral public key uses one of the groups from
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# Check to see whether the ephemeral public key uses one of the groups from
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# RFC 7919 for parameters
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# RFC 7919 for parameters
|
||||||
|
|
@ -9063,11 +9090,12 @@ run_logjam() {
|
||||||
local -i sclient_success=0
|
local -i sclient_success=0
|
||||||
local exportdhe_cipher_list="EXP1024-DHE-DSS-DES-CBC-SHA:EXP1024-DHE-DSS-RC4-SHA:EXP-EDH-RSA-DES-CBC-SHA:EXP-EDH-DSS-DES-CBC-SHA"
|
local exportdhe_cipher_list="EXP1024-DHE-DSS-DES-CBC-SHA:EXP1024-DHE-DSS-RC4-SHA:EXP-EDH-RSA-DES-CBC-SHA:EXP-EDH-DSS-DES-CBC-SHA"
|
||||||
local exportdhe_cipher_list_hex="00,63, 00,65, 00,14, 00,11"
|
local exportdhe_cipher_list_hex="00,63, 00,65, 00,14, 00,11"
|
||||||
local -i i nr_supported_ciphers=0
|
local -i i nr_supported_ciphers=0 server_key_exchange_len=0 ephemeral_pub_len=0
|
||||||
local addtl_warning="" hexc
|
local addtl_warning="" hexc
|
||||||
local cve="CVE-2015-4000"
|
local cve="CVE-2015-4000"
|
||||||
local cwe="CWE-310"
|
local cwe="CWE-310"
|
||||||
local hint=""
|
local hint=""
|
||||||
|
local server_key_exchange ephemeral_pub key_bitstring="" dh_p
|
||||||
local using_sockets=true
|
local using_sockets=true
|
||||||
|
|
||||||
"$SSL_NATIVE" && using_sockets=false
|
"$SSL_NATIVE" && using_sockets=false
|
||||||
|
|
@ -9135,6 +9163,34 @@ run_logjam() {
|
||||||
fi
|
fi
|
||||||
debugme echo $nr_supported_ciphers
|
debugme echo $nr_supported_ciphers
|
||||||
|
|
||||||
|
# Try all ciphers that use an ephemeral DH key. If successful, check whether the key uses a weak prime.
|
||||||
|
if "$using_sockets"; then
|
||||||
|
tls_sockets "03" "cc,15, 00,b3, 00,91, c0,97, 00,a3, 00,9f, cc,aa, c0,a3, c0,9f, 00,6b, 00,6a, 00,39, 00,38, 00,c4, 00,c3, 00,88, 00,87, 00,a7, 00,6d, 00,3a, 00,c5, 00,89, 00,ab, cc,ad, c0,a7, c0,43, c0,45, c0,47, c0,53, c0,57, c0,5b, c0,67, c0,6d, c0,7d, c0,81, c0,85, c0,91, 00,a2, 00,9e, c0,a2, c0,9e, 00,aa, c0,a6, 00,67, 00,40, 00,33, 00,32, 00,be, 00,bd, 00,9a, 00,99, 00,45, 00,44, 00,a6, 00,6c, 00,34, 00,bf, 00,9b, 00,46, 00,b2, 00,90, c0,96, c0,42, c0,44, c0,46, c0,52, c0,56, c0,5a, c0,66, c0,6c, c0,7c, c0,80, c0,84, c0,90, 00,66, 00,18, 00,8e, 00,16, 00,13, 00,1b, 00,8f, 00,63, 00,15, 00,12, 00,1a, 00,65, 00,14, 00,11, 00,19, 00,17, 00,b5, 00,b4, 00,2d" "ephemeralkey"
|
||||||
|
sclient_success=$?
|
||||||
|
if [[ $sclient_success -eq 0 ]] || [[ $sclient_success -eq 2 ]]; then
|
||||||
|
cp "$TEMPDIR/$NODEIP.parse_tls_serverhello.txt" $TMPFILE
|
||||||
|
key_bitstring="$(awk '/-----BEGIN PUBLIC KEY/,/-----END PUBLIC KEY/ { print $0 }' $TMPFILE)"
|
||||||
|
fi
|
||||||
|
else
|
||||||
|
$OPENSSL s_client $STARTTLS $BUGS -cipher kEDH -msg -connect $NODEIP:$PORT $PROXY $SNI >$TMPFILE 2>$ERRFILE </dev/null
|
||||||
|
sclient_connect_successful $? $TMPFILE
|
||||||
|
if [[ $? -eq 0 ]] && grep -q ServerKeyExchange $TMPFILE; then
|
||||||
|
server_key_exchange_len=$(hex2dec "$(grep ServerKeyExchange $TMPFILE | sed -e 's/<<< TLS 1.2 Handshake \[length //g' -e 's/], ServerKeyExchange//g')")
|
||||||
|
server_key_exchange_len=2+$server_key_exchange_len/16
|
||||||
|
server_key_exchange="$(grep -A $server_key_exchange_len ServerKeyExchange $TMPFILE | tail -n +2)"
|
||||||
|
server_key_exchange="$(toupper "$(strip_spaces "$(newline_to_spaces "$server_key_exchange")")")"
|
||||||
|
server_key_exchange="${server_key_exchange%%[!0-9A-F]*}"
|
||||||
|
server_key_exchange_len=${#server_key_exchange}
|
||||||
|
[[ $server_key_exchange_len -gt 8 ]] && [[ "${server_key_exchange:0:2}" == "0C" ]] && ephemeral_pub_len=$(hex2dec "${server_key_exchange:2:6}")
|
||||||
|
[[ $ephemeral_pub_len -le $server_key_exchange_len ]] && key_bitstring="$(get_dh_ephemeralkey "${server_key_exchange:8}")"
|
||||||
|
fi
|
||||||
|
fi
|
||||||
|
if [[ -n "$key_bitstring" ]]; then
|
||||||
|
dh_p="$($OPENSSL pkey -pubin -text -noout <<< "$key_bitstring" | awk '/prime:/,/generator:/' | tail -n +2 | head -n -1)"
|
||||||
|
dh_p="$(strip_spaces "$(colon_to_spaces "$(newline_to_spaces "$dh_p")")")"
|
||||||
|
# At this point the DH key's prime has been extracted into $dh_p. Compare is against known weak primes.
|
||||||
|
fi
|
||||||
|
|
||||||
tmpfile_handle $FUNCNAME.txt
|
tmpfile_handle $FUNCNAME.txt
|
||||||
return $sclient_success
|
return $sclient_success
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue