Make ASN1_EXTERN_FUNCS's parse callback CBS-based

Having to keep flipping back and forth between the calling conventions
when bridging rewritten types is tedious.

This does not rewrite the core of tasn_dec.cc (although at this point
much of it is already CBS-based), but it does suggest a calling
convention for it. Right now, the internal calling convention is the
double-pointer thing from d2i, with an extra twist that functions must
return 0 for error, 1 for success, and -1 for "success but parsed
nothing".

This proposes a CBS in/out param to return how bytes we consumed, and a
plain success/error return value. The -1 case can be modeled as
successfully consuming zero bytes.

For now, we still have to bridge the two inside tasn_dec.cc. Also for
this CL I have not yet rewritten the messy X509_NAME parser, or the
tasn_dec.cc parser.

There's also a messy situation where this object sometimes is called
with an existing object already there, and sometimes without one. I
don't see a good way to avoid that one, but hopefully it'll become less
and as important as we stop using the tasn system.

Bug: 42290418
Change-Id: I3969e19ade81aedf449b4baf139fe5f5b1dd867b
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/81776
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
4 files changed
tree: 9fc03934b8f93c2ebc702bcaa575e676d29065f0
  1. .bcr/
  2. .github/
  3. cmake/
  4. crypto/
  5. decrepit/
  6. docs/
  7. fuzz/
  8. gen/
  9. include/
  10. infra/
  11. pki/
  12. rust/
  13. ssl/
  14. third_party/
  15. tool/
  16. util/
  17. .bazelignore
  18. .bazelrc
  19. .bazelversion
  20. .clang-format
  21. .gitignore
  22. API-CONVENTIONS.md
  23. AUTHORS
  24. BREAKING-CHANGES.md
  25. BUILD.bazel
  26. build.json
  27. BUILDING.md
  28. CMakeLists.txt
  29. codereview.settings
  30. CONTRIBUTING.md
  31. FUZZING.md
  32. go.mod
  33. go.sum
  34. INCORPORATING.md
  35. LICENSE
  36. MODULE.bazel
  37. MODULE.bazel.lock
  38. PORTING.md
  39. PrivacyInfo.xcprivacy
  40. README.md
  41. SANDBOXING.md
  42. STYLE.md
README.md

BoringSSL

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.

Project links:

To file a security issue, use the Chromium process and mention in the report this is for BoringSSL. You can ignore the parts of the process that are specific to Chromium/Chrome.

There are other files in this directory which might be helpful: