On Sat, 2008-06-21 at 00:17 +0200, Johannes Berg wrote: > On Sat, 2008-06-21 at 00:13 +0200, Johannes Berg wrote: > > > > Back to the original question - discount SSH - how do we get > > > > compression + SSL out of openssl.. > > > > > > I don't think it's possible. OpenSSL says, in the NOTES section of > > > SSL_COMP_add_compression_method(3): > > > > > > The TLS standard (or SSLv3) allows the integration of > > > compression methods into the communication. The TLS RFC does > > > however not specify compression methods or their corresponding > > > identifiers, so there is currently no compatible way to > > > integrate compression with unknown peers. It is therefore > > > currently not recommended to integrate compression into > > > applications. Applications for non-public use may agree on > > > certain compression methods. Using different compression methods > > > with the same identifier will lead to connection failure. > > > > However, there is http://tools.ietf.org/html/draft-ietf-tls-compression, > > but openssl doesn't support that (only zlib and rle) > > I'm way behind the times. > http://www.faqs.org/rfc/rfc3749.txt
Looking at OpenSSL code, I think the patch below will give 0.9.8 ability
to support deflate compression. I'm not sure if I should include that to
Dovecot though. At least not for v1.1. :)
diff -r 68a0be847980 src/login-common/ssl-proxy-openssl.c
--- a/src/login-common/ssl-proxy-openssl.c Fri Jun 20 12:20:17 2008 +0300
+++ b/src/login-common/ssl-proxy-openssl.c Sat Jun 21 04:29:51 2008 +0300
@@ -719,6 +719,7 @@
ssl_clean_free);
SSL_library_init();
SSL_load_error_strings();
+ (void)SSL_COMP_get_compression_methods();
extdata_index = SSL_get_ex_new_index(0, dovecot, NULL, NULL, NULL);
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