Query regarding SSL_ERROR_SSL during SSL handshake

[Matt Caswell]

On 19/02/2020 05:16, Mahendra SP wrote:
> Hi All,
> 
> We are using Openssl version 1.0.2h. When we call SSL_do_handshake,
> sometimes we notice that handshake fails with error SSL_ERROR_SSL. 
> As per the documentation for this error, it is non recoverable and fatal
> error.  Documentation also mentions to check the error queue for further
> details. Does it mean, calling SSL_get_error after SSL_ERROR_SSL will
> give exact reason for this failure? 

OpenSSL has its own error stack. SSL_ERROR_SSL means that you should
look at that error stack for further details about what caused the
problem. For example you can use ERR_print_errors_fp() to print all the
error descriptions to stdout/stderr:

https://www.openssl.org/docs/man1.1.1/man3/ERR_print_errors_fp.html

You can get more fine grained control of the error stack using the
various ERR_* functions available. See:

https://www.openssl.org/docs/man1.1.1/man3/

Matt