Overwrite boringSSL's default key exchange preferences with safe
defaults using feature flags:
* "kx-pq-supported" enables support for PQ key exchange algorithms.
Classical key exchange is still preferred, but will be upgraded to PQ
if requested.
* "kx-pq-preferred" enables preference for PQ key exchange,
with fallback to classical key exchange if requested.
* "kx-nist-required" disables non-NIST key exchange.
Each feature implies "kx-safe-default". When this feature is enabled,
don't compile bindings for `SSL_CTX_set1_curves()` and `SslCurve`. This
is to prevent the feature flags from silently overriding curve
preferences chosen by the user.
Ideally we'd allow both: that is, use "kx-*" to set defaults, but still
allow the user to manually override them. However, this doesn't work
because by the time the `SSL_CTX` is constructed, we don't yet know
whether we're the client or server. (The "kx-*" features set different
preferences for each.) If "kx-sfe-default" is set, then the curve
preferences are set just before initiating a TLS handshake
(`SslStreamBuilder::connect()`) or waiting for a TLS handshake
(`SslStreamBuilder::accept()`).
This commit modifies the Cargo `include` field for `boring-sys` to
include all the files necessary to actually build the FIPS-certified
revision of BoringSSL. Currently, some of these files are missing (see
#157 for details on this).
This branch improves on my previous approach in PR #158, which switched
from using a Cargo `include` to a Cargo `exclude`. Using `exclude`
rather than `include` resulted in a much larger crates.io package, but
at the time, I thought this was less likely to result in breakage in the
future, because I was concerned about the inability to verify that the
set of excludes/includes can build a new pinned `boringssl` git revision
without having to actually publish a crates.io release.
However, as @nox pointed out in [this comment][1], `cargo package` can
be used to verify a build with the `exclude`s/`include`s applied. This
branch therefore adds `cargo package` steps to CI that check that the
package can actually be built. This way, we are able to make a much
smaller change to the included files, resulting in a smaller package
published to crates.io.
On this branch, the package is 6.7MiB compressed, which is not much
larger than it was previously:
```
Finished dev [unoptimized + debuginfo] target(s) in 55.65s
Packaged 1851 files, 33.7MiB (6.7MiB compressed)
```
Fixes#157Closes#158
[1]: https://github.com/cloudflare/boring/pull/158#issuecomment-1693067112,
This was originally going to be fixed by #101, however that PR was closed and superseded by #117, which was missing this fix.
The original problem was caused by #97, which updated boringssl to a version that included [a change that removed hmac.h from ssl.h](05b360d797).
This PR adds an include for hmac.h, so it is again available through boring-sys.
Previously we were building from the deps directory with submodules. For publishing we were copying files in sumbodules into the package. With this we were making the package directory dirty with build artifacts and applied patches.
This commit change the build script's behaviour: sources are now copied to the output directory and then boringssl is built from there.
In addition, this commit adds files that were missing from the package for building with patches.
This longer path (inside the prebuilt toolchain included in the NDK)
has been the preferred sysroot since NDK r19. Newer NDKs no longer
have a top-level "sysroot" directory at all.
This reverts commit 1c1af4b38b, reversing
changes made to da32be1fa9.
SslContextBuilder::cert_store_mut returns a &mut X509StoreBuilder
backed by a X509Store that is already shared with an existing SslContext.
Manuel Olguín Muñoz