0.14.0-rc1: Adopt crypto provider API, use aws-lc-rs as default provider #441

cpu · 2024-07-08T20:07:09Z

This branch updates rustls-ffi to support the cryptography provider model established upsteam in rustls since version 0.22, and later refined in 0.23. By the end of the changeset rustls-ffi, the unit tests, the integration tests, and CI will support aws-lc-rs or *ring* as cryptography providers. We follow the precedent set upstream in Rustls 0.23 and make aws-lc-rs the default choice. We do not support a model where rustls-ffi is built with both crypto providers enabled. The Makefile/CMake build tooling only allows selecting one or the other.

Notably as this branch introduces a number of breaking API changes the version number is updated from 0.13.0 to 0.14.0-rc1. I've labelled this "rc1" while we figure out one remaining downstream issue in HTTPD mod_tls.

Resolves #366

TODO

update Rustls 0.23.4 -> 0.23.11
update Changelog.md to describe breaking changes (note: waiting on review feedback in case there are changes).
consider trimming CI matrix down?
attempt a demo using a 3rd party crypto provider
stage a downstream update in curl
stage a downstream update in mod-tls

cpu · 2024-07-08T20:13:43Z

I recommend reviewing this commit-by-commit. I've taken extra care to make sure each commit builds/tests cleanly along the way.

cpu · 2024-07-16T14:59:50Z

attempt a demo using a 3rd party crypto provider

I put together a rough proof of concept for this. I don't plan to "productionize" it at this time, but it was sufficient for proving the concept.

rustls-post-quantum-ffi is a new crate that I made that wraps up the Rust rustls-post-quantum provider. It exposes one fn, const void *rustls_post_quantum_ffi_crypto_provider(void), returning a void* to what is an Arc<CryptoProvider> under the hood.

I used that to quickly extend the rustls-ffi client.c demo so that it would use rustls_post_quantum_ffi_crypto_provider() in place of the AWS LC RS backend.

With that in place we can build client and observe it doing post-quantum KEX with Cloudflare's test server:

[daniel@blanc:~/Code/Rust/rustls-post-quantum-ffi]$ cargo capi install --prefix=/tmp/rustls-ffi
<snipped>
    Finished `release` profile [optimized] target(s) in 0.08s
  Installing pkg-config file
  Installing header file
  Installing static library
  Installing shared library

[daniel@blanc:~/Code/Rust/rustls-ffi]$ cargo capi install --prefix=/tmp/rustls-ffi
<snipped>
    Finished `release` profile [optimized] target(s) in 18.19s
    Building pkg-config files
  Populating uninstalled header directory
  Installing pkg-config file
  Installing header file
  Installing static library
  Installing shared library

[daniel@blanc:~/Code/Rust/rustls-ffi]$ tree /tmp/rustls-ffi/
/tmp/rustls-ffi/
├── include
│   ├── rustls.h
│   └── rustls-post-quantum-ffi.h
└── lib
    ├── librustls.a
    ├── librustls-post-quantum-ffi.a
    ├── librustls-post-quantum-ffi.so -> librustls-post-quantum-ffi.so.0.1.0
    ├── librustls-post-quantum-ffi.so.0.1.0
    ├── librustls.so -> librustls.so.0.14.0
    ├── librustls.so.0.14.0
    └── pkgconfig
        ├── rustls.pc
        └── rustls-post-quantum-ffi.pc

[daniel@blanc:~/Code/Rust/rustls-ffi]$ PKG_CONFIG_PATH=/tmp/rustls-ffi/lib/pkgconfig make --file=Makefile.pkg-config PROFILE=debug CRYPTO_PROVIDER=aws_lc_rs
<snipped>

[daniel@blanc:~/Code/Rust/rustls-ffi]$ LD_LIBRARY_PATH=/tmp/rustls-ffi/lib ldd target/client
	<snipped>
	librustls.so.0.14.0 => /tmp/rustls-ffi/lib/librustls.so.0.14.0 (0x00007ffff7085000)
	librustls-post-quantum-ffi.so.0.1.0 => /tmp/rustls-ffi/lib/librustls-post-quantum-ffi.so.0.1.0 (0x00007ffff6dee000)
	<snipped>

[daniel@blanc:~/Code/Rust/rustls-ffi]$ RUSTLS_PLATFORM_VERIFIER=1 LD_LIBRARY_PATH=/tmp/rustls-ffi/lib ./target/client pq.cloudflareresearch.com 443 /cdn-cgi/trace 2>/dev/null | grep "kex"
kex=X25519Kyber768Draft00
kex=X25519Kyber768Draft00
kex=X25519Kyber768Draft00

cpu · 2024-07-19T13:36:19Z

@ctz @jsha I'll be out of office next week. Is it possible you folks could take a look at this branch during that time so I can address feedback when I'm back? I think this is one where we want both reviews before merging. Thanks!

cpu · 2024-07-19T18:57:14Z

stage a downstream update in curl

Here's a WIP branch. For the time being I've left all of the vtls/rustls.c code using the interfaces that assume a clear default provider is available. That means whoever builds/installs the librustls.so/librustls.a that curl links choses the crypto provider. There are potentially more complicated options we could pursue where curl sets the default provider based on its own configuration, but its not clear if that's the direction the downstream project will want to go or not. Probably merits discussion.

cpu · 2024-07-19T21:31:37Z

stage a downstream update in mod-tls

This one needs a bit more work, but here's the start of a HTTPD branch that builds mod-tls w/ 0.14.0. Like the curl branch for now I've left everything using the default crypto provider.

The experience made me think that it would be nice to offer a simplified certified key construction and supported ciphersuite list construction that assumes the default provider. These were two places where the mod-tls diff required getting a handle on the default explicitly and passing it in. It'd be more convenient for rustls-ffi to do that work for you. I'll push a revision for this when I'm back in office.

cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from d29400b to b07551e

I noticed a Makefile omission where building with CRYPTO_PROVIDER=ring was causing aws-lc-rs to be built as well. The force push was for that fix.

src/connection.rs

src/crypto_provider.rs

src/server.rs

src/client.rs

src/crypto_provider.rs

src/acceptor.rs

cpu · 2024-07-29T17:05:06Z

consider trimming CI matrix down?

A full run is ~9m. That feels reasonable-ish to me, but it's also probably not necessary to build/test with both clang/gcc for each provider/platform choice. I'm going to leave this as-is until there's additional feedback to consider.

jsha

Reviewed up through 31aed7a. Looking great so far.

src/connection.rs

src/crypto_provider.rs

src/client.rs

src/crypto_provider.rs

jsha · 2024-07-30T01:13:47Z

Finished reviewing. Two last thoughts:

I think the test matrix should include a case that builds both ring and aws-lc-rs into the same binary, since that's supported.
Ideally the version string should say which crypto providers the package was built against, though that can be a followup.

cpu · 2024-07-30T17:37:35Z

I think the test matrix should include a case that builds both ring and aws-lc-rs into the same binary, since that's supported.

I should make this more clear in the PR description, but I've tried to not support this use-case. It's technically true that you can build the rustls-ffi Rust components manually activating both --features=ring and --features=aws_lc_rs, but the Makefile, Makefile.pkg-config, and CMake build configurations only support choosing one or the other (defaulting to aws_lc_rs if not specified) and will never activate both features at once. IMO those are the only supported ways to build rustls-ffi and so we don't support builds w/ both providers.

I did that on purpose because I couldn't come up with a use-case where you would want both crypto providers built in, and it makes life harder for consuming applications. When both features are enabled the various builder fns that rely on a default will error unless a process-wide default has been explicitly set. If only one of the two features are enabled, the process is implicit and doesn't require any updates in the consumer code. As a concrete example of this the WIP curl diff I staged (diff) requires minimal changes under this model. Notably it doesn't need new code to install either rustls_aws_lc_rs_crypto_provider() or rustls_ring_crypto_provider() as the default.

WDYT? Do you think I should revisit this aspect of the design?

cpu · 2024-07-30T17:38:25Z

Ideally the version string should say which crypto providers the package was built against, though that can be a followup.

Great idea. I included an additional commit for this near the end of the series.

cpu · 2024-07-30T17:46:54Z

IMO those are the only supported ways to build rustls-ffi and so we don't support builds w/ both providers.

Maybe this is an oversimplification w.rt. cargo-c builds and it is worth having coverage? 🤔

jsha · 2024-07-30T21:27:46Z

we don't support builds w/ both providers.

That's great, I support that. This makes me realize we need an update to the README discussing building with ring. That could be where we specifically document that building with both is unsupported.

cpu · 2024-07-31T13:19:12Z

@ctz Can I bug you for a second review? I'm out today but can finish up the changelog, README update, and other misc bits on ~Thurs if this looks good to everyone.

Cargo.toml

cpu · 2024-08-01T16:23:35Z

This makes me realize we need an update to the README discussing building with ring. That could be where we specifically document that building with both is unsupported.

Added a README update to discuss the crypto provider support, choosing one, and to mention both at once is unsupported.

update Changelog.md to describe breaking changes (note: waiting on review feedback in case there are changes).

Added extensive coverage of the added/breaking changes/removed updates to the CHANGELOG.md.

The experience made me think that it would be nice to offer a simplified certified key construction and supported ciphersuite list construction that assumes the default provider.

I reworked the rustls_signing_key update so that:

rustls_certified_key_build() retains the private_key and private_key_len arguments and uses the default crypto provider to create a rustls_signing_key to use for the certified key (or will error if not set).
a new rustls_certified_key_build_with_signing_key() fn is added that allows providing a rustls_signing_key constructed with a rustls_crypto_provider in place of the private_key and private_key_len arguments of rustls_certified_key_build(). The latter uses this function internally.

I also added a new rustls_default_supported_ciphersuites() fn to return the rustls_supported_ciphersuites of the default crypto provider (or an error if not set).

I think these two changes will make life easier for the downstream users that just want to work with the defaults and not handle a rustls_crypto_provider explicitly.

#422 - "Make rustls_client_config_builder_build fallible, rm NoneVerifier"

Lastly, I remembered this issue I had filed as a breaking change and rolled it into this branch. The crypto provider work already made rustls_client_config_builder_build fallible so it was straight forward to remove the NoneVerifier. A handful of tests needed to be updated to explicitly set a provider to avoid the new RUSTLS_RESULT_NO_SERVER_CERT_VERIFIER error returned by the builder operation when no verifier is set.

@jsha Did you want to give any of these updates another pass or is this safe to merge/release?

@jsha @ctz Thank you both for the reviews! Hopefully this is the last big API update for a while now that we have more parity between this repo and the Rustls 0.21+ crypto provider API.

Now that the `rustls_client_config_builder_build()` fn is fallible it makes more sense to return an error (`RUSTLS_RESULT_NO_SERVER_CERT_VERIFIER`) when the required server certificate verifier hasn't been set instead of using `NoneVerifier` and failing all certificate validations. This commit removes the `NoneVerifier` and updates the tests that were building a client config without specifying a verifier to use the platform verifier instead. A new unit test is added that ensures the correct error is returned when a config is built without a verifier.

* Adds a `rustls_crypto_provider` type for representing a `rustls::crypto::CryptoProvider`. * The `*ring*` specific provider can be retrieved with `rustls_ring_crypto_provider()`. * The process-wide default crypto provider (if any) can be retrieved with `rustls_crypto_provider_default()`. * `rustls_crypto_provider_ciphersuites_len()` and `rustls_crypto_provider_ciphersuites_get()` can be used to fetch `rustls_supported_ciphersuite` instances the provider supports. * `rustls_default_crypto_provider_ciphersuites_len()` and `rustls_default_crypto_provider_ciphersuites_get()` can be used to fetch `rustls_supported_ciphersuite` instances the _default_ provider supports. * Adds a `rustls_crypto_provider_builder` that can be constructed based on the process default (`rustls_crypto_provider_builder_new()`) or a specific `rustls_crypto_provider` (`rustls_crypto_provider_builder_new_with_base()`). * The builder's supported ciphersuites can be customized with `rustls_crypto_provider_builder_set_cipher_suites()` * The builder can be turned into a `rustls_crypto_provider` with `rustls_crypto_provider_builder_build()`, or it can be built and installed as the process-wide default using `rustls_crypto_provider_builder_build_as_default()`. For the functions that assume a default (e.g. `rustls_default_supported_ciphersuites_len/get()`, and `rustls_crypto_provider_builder_new()`) we make an attempt to install a default based on unambiguous feature state if none has been explicitly set at the time of use. This matches the upstream Rustls behaviour using a function like `ClientConfig::builder()` and makes life easier for existing applications. The existing rustls-ffi code is not yet updated to use these abstractions. Similarly, the `*ring*` backend is unconditionally offered, but will become optional in subsequent commits.

* `rustls_server_config_builder_new()` now uses the process default crypto provider instead of being hardcoded to `*ring*`. We defer constructing the `ServerConfig` to avoid a panic in the event the process default isn't constructed. This will be surfaced as an error at build time instead. Like the upstream `ServerConfig::builder()` we make an attempt to install a process default provider from `rustls_server_config_builder_new()` if one has not been set and a clear choice is available based on crate features. * `rustls_server_config_builder_new_custom()` now takes a `rustls_crypto_provider` as an argument in place of the list of custom ciphersuites. The ciphersuites can be customized when the provider is constructed. * `rustls_server_config_builder_build()` now uses an out param for the `ServerConfig` so we can return a suitable error if there is no crypto provider (e.g. because `rustls_server_config_builder_new()` was used but the process default wasn't set and couldn't be guessed by crate features). * The `server.c` test code is updated to account for the breaking change in the builder out param.

* `rustls_client_config_builder_new()` now uses the process default crypto provider instead of being hardcoded to `*ring*`. We defer constructing the `ClientConfig` to avoid a panic in the event the process default isn't constructed. This will be surfaced as an error at build time instead. Like the upstream `ClientConfig::builder()` if no process default provider has been set when `rustls_client_config_builder_new()` is called we try to set one based on an unambiguous default implied by crate features. * `rustls_client_config_builder_new_custom()` now takes a `rustls_crypto_provider` as an argument in place of the list of custom ciphersuites. The ciphersuites can be customized when the provider is constructed. * `rustls_client_config_builder_build()` now uses an out param for the `ClientConfig` so we can return a suitable error if there is no crypto provider (e.g. because `rustls_client_config_builder_new()` was used but the process default wasn't set and couldn't be inferred from crate features). * The `client.c` test binary is updated to account for the breaking change in the client config builder out-param.

The provider model replaces these.

The `Verifier` type previously had an unconditional dependency on the `*ring*` crypto provider. This commit converts it to use the crypto provider set up by the client config builder as appropriate.

This commit adds a new type, `rustls_signing_key`, that represents a `&dyn SigningKey` loaded by a `rustls_crypto_provider`. A new `rustls_crypto_provider_load_key` fn is added to create a `rustls_signing_key` from a pointer to a `rustls_crypto_provider`, and PEM content in-memory. Wiring this up will be done in a subsequent commit.

This breaks an unconditional dependency on `*ring*` for loading certified key private keys. The existing `rustls_certified_key_build()` fn is converted to use the process-default crypto provider for this purpose. Like other functions that use the implied default if we find no default has been set yet and a clear default is available based on crate features this function will install & use it. For more control over which crypto provider is used to load a private key a new `rustls_certified_key_build_with_signing_key()` fn is added that allows specifying a `rustls_crypto_provider` to use.

This breaks an unconditional dep on `*ring*` for both verifiers. The client/server test binaries do not require any update in this case since they are using the APIs that assume a process-wide default crypto provider has been set.

This breaks an unconditional dep on `*ring*` for the `rustls_platform_verifier` verifier. The `client.c` test binary is updated to use the fallible form of the verifier constructor that uses the default crypto provider.

My IDE (clion) wants to do this automatically and I agree with its choices w.r.t removing hard tabs and adding some more consistent whitespace.

This commit: * Makes the `*ring*` dep optional, behind a `ring` feature flag * Adds an optional (but default) dep on `aws-lc-rs` behind a `aws-lc-rs` feature flag. * Adds `nasm` to the Windows build runners for the `aws-lc-rs` default crypto provider. This build requirement may be relaxed in the future depending on whether the upstream project chooses to take a ring-like strategy of distributing pre-built content. * Updates the cbindgen config to respect these new features. * Updates Makefile/Makefile.pkg-config and CMake build systems to support specifying which crypto provider to use, piping through the correct Rust features and C defines to make it all work. * One acceptor unit test is updated: the list of expected supported ciphersuites differs between `ring` and `aws-lc-rs`, with the latter also offering a P-521 suite that isn't present in `*ring*`. * The client/server examples use the implied default and so require no adjustments.

Rather than using decimal constants, rely on the rustls `SignatureScheme` enum.

This commit updates the `test` and `pkg-config` CI workflows to take into account the variable `CRYPTO_PROVIDER` support.

This commit updates both `client.c` and `server.c` to respect a new `RUSTLS_CIPHERSUITE` env var. When set, the process-default cryptography provider's supported ciphersuites will be reduced to _just_ the one specified by name in the env var. The `client_server.rs` integration test is then updated to start a server that only supports one ciphersuite. Two clients are created, one with a matching ciphersuite and one without. We use each client to connect to the server and assert only the expected one with matching ciphersuite support works.

* Mentions which providers we support, and explicitly that we do not encourage/support building with both providers enabled. * Mentions how to select a provider with the supported build systems (Make, cmake, cargo-c). * Mentions the build requirements/supported platforms of the upstream providers. For e.g. on Windows aws-lc-rs presently requires nasm because at present it (sensibly) does not ship pre-generated binaries.

There are no breaking changes to account for.

Keeping as a release candidate while we debug one remaining issue with a downstream HTTPD mod_tls update.

cpu · 2024-09-09T15:42:15Z

Cargo: version 0.13.0 -> 0.14.0-rc1

I switched the version number from 0.14.0 to 0.14.0-rc1. Despite a bunch of debugging time I still haven't been able to get to the bottom of the HTTPD mod_tls TLS 1.2 resumption issue. Ctz agreed to take a look to see if he can spot what I'm missing. So far my debugging suggests the issue is in my HTTPD patch and not the rustls-ffi code, so I think merging this as-is and calling it a release candidate will make getting help easier. If Ctz comes up empty I'll beg/plead/bribe Icing@Apache to take a peek. When we get to the bottom of the problem we can cut a 0.14 with full confidence our two major downstream projects will be able to update w/o issue.

39 successful and 11 expected checks

Admin merging so I can fixup the required check names afterwards.

cpu · 2024-09-09T20:23:45Z

so I can fixup the required check names afterwards.

Done.

cpu · 2024-09-12T15:10:08Z

Ctz agreed to take a look to see if he can spot what I'm missing

Ctz to the rescue 🦸 🏆 It turns out to be the combination of a pre-existing mod_tls bug (a cache session callback returning the wrong len for the data written to the buff) and a defensive change in rustls 0.23.11 (a change that made a codec implementation detect trailing data). I will fix the mod_tls bug alongside the update PR and we're clear to cut a final release of rustls-ffi 0.14. 🎉

cpu self-assigned this Jul 8, 2024

cpu mentioned this pull request Jul 8, 2024

CryptoProvider support #366

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cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from d385354 to d29400b Compare July 8, 2024 20:12

cpu requested review from jsha and ctz July 19, 2024 13:36

cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from d29400b to b07551e Compare July 19, 2024 20:43

cpu mentioned this pull request Jul 27, 2024

Implement AEGIS-X Cipher family #445

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ctz reviewed Jul 29, 2024

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cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from b07551e to 945aa3d Compare July 29, 2024 16:53

cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from 945aa3d to 71afa4d Compare July 29, 2024 18:28

jsha requested changes Jul 30, 2024

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cpu mentioned this pull request Jul 30, 2024

MSRV >= 1.76: Tidy up crypto provider customization #450

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cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from 71afa4d to 8e7b45a Compare July 30, 2024 17:19

jsha approved these changes Jul 30, 2024

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cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from 8e7b45a to 174725b Compare August 1, 2024 16:15

ctz approved these changes Aug 1, 2024

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cpu added 19 commits September 9, 2024 09:48

cipher: remove hardcoded ring ciphersuites

aec3d3a

The provider model replaces these.

client: convert Verifier to provider

3e2fbec

The `Verifier` type previously had an unconditional dependency on the `*ring*` crypto provider. This commit converts it to use the crypto provider set up by the client config builder as appropriate.

cipher: convert platform verifier to provider

dd9ffab

This breaks an unconditional dep on `*ring*` for the `rustls_platform_verifier` verifier. The `client.c` test binary is updated to use the fallible form of the verifier constructor that uses the default crypto provider.

cmake: reformat CMakeLists files

f0c88c4

My IDE (clion) wants to do this automatically and I agree with its choices w.r.t removing hard tabs and adding some more consistent whitespace.

build: include crypto provider in rustls_version()

29edf5a

acceptor: tidy up expected sig scheme test

ed2303d

Rather than using decimal constants, rely on the rustls `SignatureScheme` enum.

ci: add aws-lc-rs/ring crypto provider coverage

9c9d00f

This commit updates the `test` and `pkg-config` CI workflows to take into account the variable `CRYPTO_PROVIDER` support.

Cargo: update rustls 0.23.4 -> 0.23.12

86b8435

There are no breaking changes to account for.

docs: add 0.14.0 changelog

1375c7b

cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from 2fba428 to d5b6b6f Compare September 9, 2024 14:17

Cargo: version 0.13.0 -> 0.14.0-rc1

a582386

Keeping as a release candidate while we debug one remaining issue with a downstream HTTPD mod_tls update.

cpu force-pushed the cpu-366-choose-your-own-crypto-adventure branch from d5b6b6f to a582386 Compare September 9, 2024 15:33

cpu changed the title ~~0.14.0: Adopt crypto provider API, use aws-lc-rs as default provider~~ 0.14.0-rc1: Adopt crypto provider API, use aws-lc-rs as default provider Sep 9, 2024

cpu marked this pull request as ready for review September 9, 2024 15:35

cpu merged commit 635c8f1 into rustls:main Sep 9, 2024
39 checks passed

cpu deleted the cpu-366-choose-your-own-crypto-adventure branch September 9, 2024 15:42

chenrui333 mentioned this pull request Sep 13, 2024

rustls-ffi 0.14.0 Homebrew/homebrew-core#189357

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0.14.0-rc1: Adopt crypto provider API, use aws-lc-rs as default provider #441

0.14.0-rc1: Adopt crypto provider API, use aws-lc-rs as default provider #441

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0.14.0-rc1: Adopt crypto provider API, use aws-lc-rs as default provider #441

0.14.0-rc1: Adopt crypto provider API, use aws-lc-rs as default provider #441

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