help request: want to know how to support sslv3 in apisix

[jujiale]

Description

Hello，for some reason，we need to support SSLv3 TLSv1 TLSv1.1 in our apisix, I added TLSv1 and TLSv1.1 ssl_ciphers. after doing this. I test it with my java client(specify TLS version)， it works fine，the following is my config:
`

ssl_protocols: "TLSv1 TLSv1.1 TLSv1.2 TLSv1.3"
ssl_ciphers: "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA"

`
the above config works fine. I test TLSv1 TLSv1.1 TLSv1.2 TLSv1.3 , all ok.

in my apisix machine, openssl version is v1.1.1s. I use the following command:
`

# openssl ciphers -v | grep SSLv3
DHE-RSA-AES256-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(256)  Mac=SHA1
DHE-RSA-AES128-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(128)  Mac=SHA1
SRP-RSA-AES-256-CBC-SHA SSLv3 Kx=SRP      Au=RSA  Enc=AES(256)  Mac=SHA1
SRP-AES-256-CBC-SHA     SSLv3 Kx=SRP      Au=SRP  Enc=AES(256)  Mac=SHA1
RSA-PSK-AES256-CBC-SHA  SSLv3 Kx=RSAPSK   Au=RSA  Enc=AES(256)  Mac=SHA1
DHE-PSK-AES256-CBC-SHA  SSLv3 Kx=DHEPSK   Au=PSK  Enc=AES(256)  Mac=SHA1
AES256-SHA              SSLv3 Kx=RSA      Au=RSA  Enc=AES(256)  Mac=SHA1
PSK-AES256-CBC-SHA      SSLv3 Kx=PSK      Au=PSK  Enc=AES(256)  Mac=SHA1
SRP-RSA-AES-128-CBC-SHA SSLv3 Kx=SRP      Au=RSA  Enc=AES(128)  Mac=SHA1
SRP-AES-128-CBC-SHA     SSLv3 Kx=SRP      Au=SRP  Enc=AES(128)  Mac=SHA1
RSA-PSK-AES128-CBC-SHA  SSLv3 Kx=RSAPSK   Au=RSA  Enc=AES(128)  Mac=SHA1
DHE-PSK-AES128-CBC-SHA  SSLv3 Kx=DHEPSK   Au=PSK  Enc=AES(128)  Mac=SHA1
AES128-SHA              SSLv3 Kx=RSA      Au=RSA  Enc=AES(128)  Mac=SHA1
PSK-AES128-CBC-SHA      SSLv3 Kx=PSK      Au=PSK  Enc=AES(128)  Mac=SHA1

`

then I add the cipher in ssl_ciphers and add protol SSLv3 in ssl_protocols:
`

ssl_protocols: SSLv3
ssl_ciphers: "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA"

`

I added crt and key in apisix ssl model，as below:

then I use java client specify SSLv3 ,send a request. the handshake is failed:

what more confuse me is when config ssl_protocols: TLSv1 TLSv1.1 TLSv1.2 TLSv1.3 SSLv3，I use java client specify SSLv3 ,send a request. the packet is indicate using TLSv1, I do not know why.

I want to know, how support SSLv3 in apisix, need your help, thanks

Environment

• APISIX version (run apisix version): 2.15.0
• Operating system (run uname -a):Linux 3.10.0-1160.71.1.el7.x86_64
• OpenResty / Nginx version (run openresty -V or nginx -V):openresty/1.21.4.2
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):3.5.0
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[kayx23]

ssl_protocols: TLSv1 TLSv1.1 TLSv1.2 TLSv1.3 SSLv3

No need to specify SSLv3. TLSv1.3 is enough.

[moonming]

SSLv3 is an outdated and insecure protocol, and it's recommended to use more secure versions like TLSv1.2 or TLSv1.3.

If you must enable SSLv3, you can first test the behavior of NGINX. Apache APISIX is consistent with NGINX in this ability.