openssl reads cert.pem in two-byte increments on Windows

[joshcooper]

Describe the Bug

openssl shipped in the runtime inefficiently reads cert.pem on Windows. A simple puppet --version results in 116k calls to ReadFile with a two-byte buffer as can be seen from Process Monitor:

Expected Behavior

It should use buffered reads

Steps to Reproduce

Steps to reproduce the behavior:

1. Install puppet-agent 8.4.0
2. Start process monitor and filter on process name ruby.exe
3. Run puppet --version

Environment

C:\ProgramData\PuppetLabs>ruby --version
ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw32]

C:\ProgramData\PuppetLabs>openssl version
OpenSSL 3.0.12 24 Oct 2023 (Library: OpenSSL 3.0.12 24 Oct 2023)

C:\ProgramData\PuppetLabs>puppet --version
8.4.0

Additional Context

This might be a bug in upstream openssl 3.0.x. Need to check if puppet-agent 7.x/openssl 1.1.1 has the same issue.

[joshcooper]

Can be reproduced using:

#include <openssl/ssl.h>

int main(int argc, char **argv)
{
    SSL_CTX* ctx = SSL_CTX_new(TLS_client_method());
    SSL_CTX_set_default_verify_file(ctx);
    return 0;
}

OpenSSL disabled file buffering when text mode is enabled: openssl/openssl#13190

To work around an issue in the UCRT: https://developercommunity.visualstudio.com/t/fseek-ftell-fail-in-text-mode-for-unix-style-text/425878

[joshcooper]

I submitted openssl/openssl#24249