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Feature #15215

HTTPS server name indication (SNI): explicit server_name in Net::HTTP

Added by aspettl (Aaron Spettl) 2 months ago. Updated 2 months ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
[ruby-core:89305]

Description

Current behavior and problem:
At the moment, the host name or IP address given in the URL is used to provide the server name for SNI in HTTPS connections. While this behavior is sufficient in most cases, establishing a connection to a fixed IP using a certain server name is not possible.

Proposed solution:
Decouple the server name used for SNI from the address used for connecting. Add a new ssl_server_name attribute in Net::HTTP that defaults to the address (so the default behavior stays exactly the same).

Notes

  • There are scenarios where a client would like to select a specific host when e.g. DNS round robin is configured. Examples: fallback strategies, monitoring of individual hosts.
  • This has nothing to do with the HTTP "Host" header, which one needs to set additionally.

For my "proposed solution", a patch is attached (or see https://github.com/ruby/ruby/pull/1977).
Please let me know about any ideas for improvement or other approaches, thanks!

ssl_server_name.patch (2.17 KB) ssl_server_name.patch Patch: Introduce new attribute ssl_server_name in Net::HTTP aspettl (Aaron Spettl), 10/07/2018 09:15 AM

History

#1 [ruby-core:89307] Updated by aspettl (Aaron Spettl) 2 months ago

aspettl (Aaron Spettl) wrote:

Proposed solution:
Decouple the server name used for SNI from the address used for connecting. Add a new ssl_server_name attribute in Net::HTTP that defaults to the address (so the default behavior stays exactly the same).

One comment on a corner case:
When ssl_server_name is set, then it is always used for verifying the certificate - even when OpenSSL is old and does not support SNI yet. In such a case, the certificate presented by the server will not match probably (and, thus, verification fails). I think this is desired behavior.

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