So for quite a few months I was pretty sure having HTTPS on multiple domains with the same IP was a no-go on nginx. I was wrong.
If you have a OpenSSL version >= 0.9.8f with SNI support compiled in and a half-way recent nginx version you are good to go. Just set up as many virtual domains as needed.
Quick example from memory (I'm quite positive it is correct though):
server {
server_name somedomain.example.com;
listen 443;
keepalive_timeout 70;
ssl on;
ssl_protocols SSLv3;
ssl_certificate /some/file.pem;
ssl_certificate_key /some/file.key;
}
server {
server_name someotherdomain.example.com;
listen 443;
keepalive_timeout 70;
ssl on;
ssl_protocols SSLv3;
ssl_certificate /some/other/file.pem;
ssl_certificate_key /some/other/file.key;
}
server {
server_name evenotherdomain.example.com;
}
Keep in mind though, that enabling SSL in any way leads to a kind of catch-all situation. Meaning if you access https://evenotherdomain.exmaple.com you will most likely end up on one of your SSL-enabled domains (domedomain.example.com or someotherdomain.example.com).
Here is what I did to prevent that:
server {
listen 443;
server_name evenotherdomain.example.com;
rewrite ^(.*) http://example.com$1 permanent;
}