windows: add RtlCaptureContext, RtlLookupFunctionEntry, RtlVirtualUnwind and supporting types
windows: fix alignment of CONTEXT structs to match winnt.h as required by RtlCaptureContext (fxsave instr)
windows aarch64: fix __chkstk being defined twice if libc is not linked on msvc
Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>
This is simply a small convenience wrapper around
'meta.fieldInfo(T, .field).type'. However, this operation is common
enough that it makes sense to have its own function for.
Although RFC 8446 states:
> Each party MUST send a "close_notify" alert before closing its write
> side of the connection
In practice many servers do not do this. Also in practice, truncation
attacks are thwarted at the application layer by comparing the amount of
bytes received with the amount expected via the HTTP headers.
This allows for a more optimal std.crypto.tlcsprng codepath.
Without it a an "incorrect alignment" panic is triggered from
crypto.tlcsprng which aligns a threadlocal but it's actually
not aligned, thus detected by the safety check.
It appears that LLVM-IR does attribute the storage with alignment
but it is ultimately not respected in the final binary for netbsd
and dragonfly.
- per darwin-xnu source, fcntl F_GETPATH will return ENOSPC when path
exceeds either user-supplied buffer or system MAXPATHLEN
- macOS does not document this (and other) possible errno values
Previously, the code only checked Common Name, leading to unable to
validate valid certificates which relied on the subject_alt_name
extension for host name verification.
This commit also adds rsa_pss_rsae_* back to the signature algorithms
list in the ClientHello.
It appears to be implemented incorrectly in the wild and causes the read
connection to be closed even though that is a direct violation of RFC
8446 Section 6.1.
The writeEnd function variants are still there, ready to be used.
This commit adds `writeEnd` and `writeAllEnd` in order to send data and
also notify the server that there will be no more data written.
Unfortunately, it seems most TLS implementations in the wild get this
wrong and immediately close the socket when they see a close_notify,
rather than only ending the data stream on the application layer.
This commit introduces tls.Decoder and then uses it in tls.Client. The
purpose is to make it difficult to introduce vulnerabilities in the
parsing code. With this abstraction in place, bugs in the TLS
implementation will trip checks in the decoder, regardless of the actual
length of packets sent by the other party, so that we can have
confidence when using ReleaseFast builds.
The code we are borrowing from https://github.com/shiguredo/tls13-zig
requires an Allocator for doing RSA certificate verification. As a
stopgap measure, this commit uses a FixedBufferAllocator to avoid heap
allocation for these functions.
Thank you to @naoki9911 for providing this great resource which has been
extremely helpful for me when working on this standard library TLS
implementation. Until Zig has std.crypto.rsa officially, we will borrow
this implementation of RSA. 🙏
This is a streaming HTTP header parser. All it currently does is detect
the end of headers. This will be a non-allocating parser where one can
bring supply their own buffer if they want to handle custom headers.
This commit also improves std.http.Client to not return the HTTP headers
with the read functions.
Here's what I landed on for the TLS client. It's 16896 bytes
(max_ciphertext_record_len is 16640). I believe this is the theoretical
minimum size, give or take a few bytes.
These constraints are satisfied:
* a call to the readvAdvanced() function makes at most one call to the
underlying readv function
* iovecs are provided by the API, and used by the implementation for
underlying readv() calls to the socket
* the theoretical minimum number of memcpy() calls are issued in all
circumstances
* decryption is only performed once for any given TLS record
* large read buffers are fully exploited
This is accomplished by using the partial read buffer to storing both
cleartext and ciphertext.
The read function has been renamed to readAdvanced since it has slightly
different semantics than typical read functions, specifically regarding
the end-of-file. A higher level read function is implemented on top.
Now, API users may pass small buffers to the read function and
everything will work fine. This is done by re-decrypting the same
ciphertext record with each call to read() until the record is finished
being transmitted.
If the buffer supplied to read() is large enough, then any given
ciphertext record will only be decrypted once, since it decrypts
directly to the read() buffer and therefore does not need any memcpy. On
the other hand, if the buffer supplied to read() is small, then the
ciphertext is decrypted into a stack buffer, a subset is copied to the
read() buffer, and then the entire ciphertext record is saved for the
next call to read().
Only a little bit of generalized logic for DER encoding is needed and so
it can live inside the Certificate namespace.
This commit removes the generic "parse object id" function which is no
longer used in favor of more specific, smaller sets of object ids used
with ComptimeStringMap.
