diff --git a/etc/client-simulation.wiresharked.md b/etc/client-simulation.wiresharked.md index b4c108f..5d5e69b 100644 --- a/etc/client-simulation.wiresharked.md +++ b/etc/client-simulation.wiresharked.md @@ -1,4 +1,4 @@ -The file `client-simulation.wiresharked.txt` contains client handshake data manually harvested from a network capture and displayed best with Wireshark. +The file `client-simulation.wiresharked.txt` contains client handshake data manually harvested from a network capture and displayed by Wireshark. The content needs to be added to `client-simulation.txt` which other part comes from the SSLlabs client API via `update_client_sim_data.pl` The whole process is manual but not too difficult. @@ -11,16 +11,17 @@ The whole process is manual but not too difficult. * If needed sort for ClientHello. * Look for the ClientHello which matches the source IP + destination you had in mind. Check the destination hostname in the SNI extension so that you can be sure, it's the right traffic. * Edit `client-simulation.wiresharked.txt` and insert a new section, preferably by copying a previous version of the client from it. -* Edit the *names* accordingly and *short*. The latter must not contain blanks. +* Edit the *names* accordingly and the *short* description. The latter must not contain blanks. * Retrieve *handshakebytes* by marking the "TLS 1.x Record Layer" --> Copy --> As a hex stream. -* For *ch_ciphers* mark "Cipher Suites" --> Copy --> As a hex stream, remove any leading GREASE ciphers (?a?a) and supply it to `~/utils/hexstream2cipher.sh`. For consistency reasons it is preferred you remove the TLS 1.3 ciphers before which start with TLS\*. -* *ciphersuites* are TLS 1.3 ciphersuites. You can identify them as they currently are like 0x130?. Retrieve them from above see `~/utils/hexstream2cipher.sh`. They start with TLS\*. +* For *ch_ciphers*: mark "Cipher Suites" --> Copy --> As a hex stream, remove any leading GREASE ciphers (?a?a) and supply it to `~/utils/hexstream2cipher.sh`. For consistency reasons it is preferred you remove the TLS 1.3 ciphers before which start with TLS\*. +* *ciphersuites* are TLS 1.3 ciphersuites. You can identify them as they currently are normallky like 0x13\*\*. Retrieve them from above see `~/utils/hexstream2cipher.sh`. They start with TLS\*. * Figure out *protos* and *tlsvers* by looking at the *supported_versions* TLS extension (43=0x002b). May work only with recent clients. Be careful as some do not list all TLS versions here (OpenSSL 1.1.1 listed only TLS 1.2/1.3). * Adjust *lowest_protocol* and *highest_protocol* accordingly. * For *curves* mark the "supported groups" TLS extension --> Copy --> As a hex stream, remove any leading GREASE ciphers (?a?a) and supply it to `~/utils/hexstream2curves.sh`. * Retrieve *alpn* by looking at the "alpn" TLS extension 16 (=0x0010). * Review TLS extension 13 (=0x000d) "signature_algorithm" whether any SHA1 signature algorithm is listed. If not *requiresSha2* is true. * Leave *maxDhBits*/*minDhBits* and *minRsaBits*/*maxRsaBit* at -1, unless you know for sure what the client can handle. -* Figure out the *services* by applying a good piece of human logic. A (modern) browser is probably "HTTP", OpenSSL or Java "ANY" whereas Thunderbird supports a variety of protocols. +* When using wireshark, copy also the ja3 and ja4 values accordingly, see e.g. like *java80442*. This could be used in the future. +* Figure out the *services* by applying a good piece of human logic or have a look at a different version of the client. A (modern) browser is probably "HTTP", OpenSSL or Java "ANY" whereas Thunderbird supports a variety of protocols. * When you're done copy your inserted section from `client-simulation.wiresharked.txt` into `client-simulation.txt`. * Before submitting a PR: test it yourself! You can also watch it again via wireshark.