| commit | 6e678eeb6e76171712ae00d467321b6fe196152d | [log] [tgz] |
|---|---|---|
| author | David Benjamin <davidben@google.com> | Mon Apr 16 19:54:42 2018 -0400 |
| committer | Adam Langley <agl@google.com> | Wed May 02 19:21:56 2018 +0000 |
| tree | 4a51bf5c5edc3bd26a56d35cd23b5b3a078ef598 | |
| parent | 71666cb87c4de0bbc34df783e571bdc936f38b0b [diff] |
Remove legacy SHA-2 CBC ciphers. All CBC ciphers in TLS are broken and insecure. TLS 1.2 introduced AEAD-based ciphers which avoid their many problems. It also introduced new CBC ciphers based on HMAC-SHA256 and HMAC-SHA384 that share the same flaws as the original HMAC-SHA1 ones. These serve no purpose. Old clients don't support them, they have the highest overhead of all TLS ciphers, and new clients can use AEADs anyway. Remove them from libssl. This is the smaller, more easily reverted portion of the removal. If it survives a week or so, we can unwind a lot more code elsewhere in libcrypto. This removal will allow us to clear some indirect calls from crypto/cipher_extra/tls_cbc.c, aligning with the recommendations here: https://github.com/HACS-workshop/spectre-mitigations/blob/master/crypto_guidelines.md#2-avoid-indirect-branches-in-constant-time-code Update-Note: The following cipher suites are removed: - TLS_RSA_WITH_AES_128_CBC_SHA256 - TLS_RSA_WITH_AES_256_CBC_SHA256 - TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 - TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 - TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 - TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 Change-Id: I7ade0fc1fa2464626560d156659893899aab6f77 Reviewed-on: https://boringssl-review.googlesource.com/27944 Reviewed-by: Adam Langley <agl@google.com>
BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.
Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.
Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.
BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.
Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.
There are other files in this directory which might be helpful: