Forcing a particular SSL protocol for an nginx proxying server
- by vitch
I am developing an application against a remote https web service. While developing I need to proxy requests from my local development server (running nginx on ubuntu) to the remote https web server. Here is the relevant nginx config:
server {
server_name project.dev;
listen 443;
ssl on;
ssl_certificate /etc/nginx/ssl/server.crt;
ssl_certificate_key /etc/nginx/ssl/server.key;
location / {
proxy_pass https://remote.server.com;
proxy_set_header Host remote.server.com;
proxy_redirect off;
}
}
The problem is that the remote HTTPS server can only accept connections over SSLv3 as can be seen from the following openssl calls.
Not working:
$ openssl s_client -connect remote.server.com:443
CONNECTED(00000003)
139849073899168:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 226 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
---
Working:
$ openssl s_client -connect remote.server.com:443 -ssl3
CONNECTED(00000003)
<snip>
---
SSL handshake has read 1562 bytes and written 359 bytes
---
New, TLSv1/SSLv3, Cipher is RC4-SHA
Server public key is 1024 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : SSLv3
Cipher : RC4-SHA
<snip>
With the current setup my nginx proxy gives a 502 Bad Gateway when I connect to it in a browser. Enabling debug in the error log I can see the message: [info] 1451#0: *16 peer closed connection in SSL handshake while SSL handshaking to upstream.
I tried adding ssl_protocols SSLv3; to the nginx configuration but that didn't help.
Does anyone know how I can set this up to work correctly?
