I am using a Java program to call a Perl script which calls curl to upload a
file to a FTPS server. The FTPS server has a certificate which requires a pass
phrase. My Java program reads from standard error looking for the "Enter PEM
pass phrase:" prompt so I can then write the pass phrase to stdin.
The problem is the "Enter PEM pass phrase:" prompt is not present in standard
error or standard out. For example: from the Linux (Red Hat Enterprise 5.1)
bash shell prompt, I call curl and redirect standard error and standard output
to files. The "Enter PEM pass phrase:" prompt still appears at the console, and
is not present in either of the redirect files.
I am trying to understand how OpenSSL writes this prompt, especially to what
stream it writes it. I believe curl is calling
SSL_CTX_use_certificate_chain_file which issues the prompt, but I am not
certain about that. I do see the prompt in pem_lib.c method PEM_def_callback.
The prompt is written in ui_lib.c method UI_process, in the call
ui->meth->ui_write_string. At this point I don't understand what happens. I am
not a C programmer.
My ultimate problem is how to capture the "Enter PEM pass phrase:" prompt from
a Java program as described above. But my question for this list is, please
explain how the "Enter PEM pass phrase:" prompt is written, including where is
the code which actually writes.
Thanks
Robert O'Hearne
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