Merge branch 'ob/imap-send-ssl-verify'

Correctly connect to SSL/TLS sites that serve multiple hostnames on
a single IP by including Server Name Indication in the client-hello.

* ob/imap-send-ssl-verify:
imap-send: support Server Name Indication (RFC4366)

diff --git a/imap-send.c b/imap-send.c
index 43ac4e0bdfdba8850eff176b53d6bd071e8f424c..d9bcfb44dc334d86363fd60b576fcc2e2121f971 100644 (file)
--- a/imap-send.c
+++ b/imap-send.c
@@ -304,6 +304,17 @@ static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int ve
                return -1;
        }
 
+#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
+       /*
+        * SNI (RFC4366)
+        * OpenSSL does not document this function, but the implementation
+        * returns 1 on success, 0 on failure after calling SSLerr().
+        */
+       ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
+       if (ret != 1)
+               warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
+#endif
+
        ret = SSL_connect(sock->ssl);
        if (ret <= 0) {
                socket_perror("SSL_connect", sock, ret);