Streamline ephemeral key handling:
- drop support for ephemeral RSA keys (only allowed/needed
for export ciphers)
- drop pTmpKeys from the per-process SSLModConfigRec, and remove
the temp key generation at startup (unnecessary for DHE/ECDHE)
- unconditionally disable null and export-grade ciphers by always
prepending "!aNULL:!eNULL:!EXP:" to any cipher suite string
- do not configure per-connection SSL_tmp_*_callbacks, as it is
sufficient to set them for the SSL_CTX
- set default curve for ECDHE at startup, obviating the need
for a per-handshake callback, for the time being (and also
configure SSL_OP_SINGLE_ECDH_USE, previously left out)
For additional background, see
https://mail-archives.apache.org/mod_mbox/httpd-dev/201309.mbox/%3C52358ED1.2070704@velox.ch%3E
Follow-up fixes for r1526168:
- drop SSL_TMP_KEY_* constants from ssl_private.h, too
- make sure we also disable aNULL, eNULL and EXP ciphers
for per-directory SSLCipherSuite directives
- apply the same treatment to SSLProxyCipherSuite
Increase minimum required OpenSSL version to 0.9.8a (in preparation
for the next mod_ssl commit, which will rely on the get_rfcX_prime_Y
functions added in that release):
- remove obsolete #defines / macros
- in ssl_private.h, regroup definitions based on whether
they depend on TLS extension support or not
- for ECC and SRP support, set HAVE_X and change the rather awkward
#ifndef OPENSSL_NO_X lines accordingly
For the discussion prior to taking this step, see
https://mail-archives.apache.org/mod_mbox/httpd-dev/201309.mbox/%3C524275C7.9060408%40velox.ch%3E
Improve ephemeral key handling (companion to r1526168):
- allow to configure custom DHE or ECDHE parameters via the
SSLCertificateFile directive, and adapt its documentation
accordingly (addresses PR 49559)
- add standardized DH parameters from RFCs 2409 and 3526,
use them based on the length of the certificate's RSA/DSA key,
and add a FAQ entry for clients which limit DH support
to 1024 bits (such as Java 7 and earlier)
- move ssl_dh_GetParamFromFile() from ssl_engine_dh.c to
ssl_util_ssl.c, and add ssl_ec_GetParamFromFile()
- drop ssl_engine_dh.c from mod_ssl
For the standardized DH parameters, OpenSSL version 0.9.8a
or later is required, which was therefore made a new minimum
requirement in r1527294.
PR 55616 (add missing APLOGNO), part 2
Submitted by: kbrand
Reviewed/backported by: jim
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1542327 13f79535-47bb-0310-9956-ffa450edef68
