Descriptografa o tráfego SSL com a ferramenta de linha de comando openssl 8

Question

Para as etapas finais do meu script, segui isso para obter a chave de criptografia do cliente para executar a descriptografia com

client.random xxd -p crnd.bin

5b689404b500456eef2f1a79ec782eb3eeaac3a8d7c02ae03c8426f363b1
8a33

server.random xxd - srnd.bin

5b6894043bb1289e158b0278ef66dc53c9fa71e75e900739af2657cd4476
ec1e

(echo -n expansão de chave; cat srnd.bin crnd.bin) > master_seed.key
xxd -p master_seed.key

6b657920657870616e73696f6e 5b6894043bb1289e158b0278ef66dc53c9
fa71e75e900739af2657cd4476ec1e 5b689404b500456eef2f1a79ec782e
b3eeaac3a8d7c02ae03c8426f363b18a33
note: as before the spaces are not there I added them for clarity

key=$(cat master_secret.hex)                                                                        
openssl dgst -sha256 -mac hmac -macopt hexkey:$key <master_seed.key -binary >a1
openssl dgst -sha256 -mac hmac -macopt hexkey:$key <a1 -binary >a2
openssl dgst -sha256 -mac hmac -macopt hexkey:$key <a2 -binary >a3
openssl dgst -sha256 -mac hmac -macopt hexkey:$key <a3 -binary >a4
##
cat a1 master_seed.key | openssl dgst -sha256 -mac hmac -macopt hexkey:$key -binary >k1
cat a2 master_seed.key | openssl dgst -sha256 -mac hmac -macopt hexkey:$key -binary >k2
cat a3 master_seed.key | openssl dgst -sha256 -mac hmac -macopt hexkey:$key -binary >k3
cat a4 master_seed.key | openssl dgst -sha256 -mac hmac -macopt hexkey:$key -binary >k4
cat k1 k2 k3 k4 | head -c104 | xxd -p -c104 > k1_k4.hex
truncate -s-1 k1_k4.hex

$cat k1_k4.hex
64666eafe1cbd51f2e2b50799b40f6007c3dc56fe0aac1312d35b5e8b6bf9af6ecf07e1dff27c784
4bf20108190203c4210ff9df6c4eb6e907ddd1f49646ab4b243c80a6ae9b4808ca94445e3d771d3e
06b71ee0deb4c1879986c4c6a4b78bf1c3c1083a6ddce9ff
dd bs=40 count=1 if=k1_k4.hex of=cmackey.hex 2>/dev/null
dd bs=40 count=1 skip=1 if=k1_k4.hex of=smackey.hex 2>/dev/null
dd bs=80 skip=1 if=k1_k4.hex 2>/dev/null | dd bs=64 count=1 of=cenckey.hex 2>/dev/null
dd bs=80 skip=1 if=k1_k4.hex 2>/dev/null | dd bs=64 skip=1 count=1 of=senckey.hex 2>/dev/null

$ cat cmackey.hex

64666eafe1cbd51f2e2b50799b40f6007c3dc56f

$ cat smackey.hex

e0aac1312d35b5e8b6bf9af6ecf07e1dff27c784

$ cat cenckey.hex

4bf20108190203c4210ff9df6c4eb6e907ddd1f49646ab4b243c80a6ae9b4808

$ cat senckey.hex

ca94445e3d771d3e06b71ee0deb4c1879986c4c6a4b78bf1c3c1083a6ddce9ff

Registro wireshark de handshake criptografado

TLSv1.2 Record Layer: Handshake Protocol: Encrypted Handshake Message
    Content Type: Handshake (22)
    Version: TLS 1.2 (0x0303)
    Length: 64
    Handshake Protocol: Encrypted Handshake Message

Handshake Protocol: Encrypted Handshake Message
16030300409a1bf36b786c3b5985617c76afd985d68ffdaf
6d9f1a25ef40159702b5adef402bdb5196ce76a93fd73049
3accf929447fa9c6f1172d6b4035f5578ebfe95c6d

Salvo apenas os dados criptografados (últimos 64 bytes para cenc.dat) $ xxd -p cenc.dat

9a1bf36b786c3b5985617c76afd985d6 8ffdaf6d9f1a25ef40159702b5ad
ef402bdb5196ce76a93fd730493accf929447fa9c6f1172d6b4035f5578e
bfe95c6d
Note: space added again for clarity

$ xxd -p iv.bin

9a1bf36b786c3b5985617c76afd985d6

$ xxd -p encmsg.bin

8ffdaf6d9f1a25ef40159702b5adef402bdb5196ce76a93fd730493accf9
29447fa9c6f1172d6b4035f5578ebfe95c6d

Último

$cat encmsg.bin | openssl aes-256-cbc -d -K $key -iv $iv -nopad |xxd
gives the same result of bad decrypted data not a finished (14) record

Dave, Ao comparar meu byte de saída para byte, não vejo nenhum problema com meus passos. Eu já passei por isso uma dúzia ou mais vezes manualmente e chamei meu script e obtive a mesma saída que está errada, como você observou, não decriptografa uma mensagem final. Você está vendo alguma coisa aqui? Obrigado