boringssl

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Author	SHA1	Message	Date
David Benjamin	a6d321b11f	Tighten up supported PSS combinations in X.509. Matching Chromium, Go, and TLS 1.3, only allow SHA-256, SHA-384, and SHA-512 RSA-PSS signatures, where MGF-1 and message hash match and salt length is hash length. Sadly, we are stuck tolerating an explicit trailerField for now. See the certificates in cl/362617931. This also fixes an overflow bug in handling the salt length. On platforms with 64-bit long and 32-bit int, we would misinterpret, e.g, 2^62 + 32 as 32. Also clean up the error-handling of maskHash. It was previously handled in a very confusing way; syntax errors in maskHash would succeed and only be noticed later, in rsa_mgf1_decode. I haven't done it in this change, but as a followup, we can, like Chromium, reduce X.509 signature algorithms down to a single enum. Update-Note: Unusual RSA-PSS combinations in X.509 are no longer accepted. This same change (actually a slightly stricter version) has already landed in Chrome. Bug: 489 Change-Id: I85ca3a4e14f76358cac13e66163887f6dade1ace Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/53865 Auto-Submit: David Benjamin <davidben@google.com> Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: Adam Langley <agl@google.com>	3 years ago

Author

SHA1

Message

Date

David Benjamin

a6d321b11f

Tighten up supported PSS combinations in X.509.

Matching Chromium, Go, and TLS 1.3, only allow SHA-256, SHA-384, and
SHA-512 RSA-PSS signatures, where MGF-1 and message hash match and salt
length is hash length. Sadly, we are stuck tolerating an explicit
trailerField for now. See the certificates in cl/362617931.

This also fixes an overflow bug in handling the salt length. On
platforms with 64-bit long and 32-bit int, we would misinterpret, e.g,
2^62 + 32 as 32. Also clean up the error-handling of maskHash. It was
previously handled in a very confusing way; syntax errors in maskHash
would succeed and only be noticed later, in rsa_mgf1_decode.

I haven't done it in this change, but as a followup, we can, like
Chromium, reduce X.509 signature algorithms down to a single enum.

Update-Note: Unusual RSA-PSS combinations in X.509 are no longer
accepted. This same change (actually a slightly stricter version) has
already landed in Chrome.

Bug: 489
Change-Id: I85ca3a4e14f76358cac13e66163887f6dade1ace
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/53865
Auto-Submit: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>

3 years ago

1 Commits (d1b20a9580aebb6fbb0b1b2408cf1221d83afb71)