[nos-bbs] MD5 Authentication Response

Michael Fox - N6MEF n6mef at mefox.org
Sun Apr 15 15:30:42 EDT 2018



I'm trying to figure out how a generic (non-JNOS) client would respond to
the "Password [.] :" prompt issued by JNOS when MD5AUTHENTICATION is


The response from a JNOS client appears to be created in lines 358-361 of
telnet.c.  But I'm not knowledgeable enough about C to understand what it's


For example, suppose I was on a Linux or Windows machine (not running JNOS)
and I telnetted to a JNOS machine that has MD5 AUTHENTICATION defined.  I
enter my login at the login prompt.  Then I get the "Password [.] " prompt.
Given the challenge in the password prompt and given that I know my
password, how would I calculate (i.e. what commands would I run to generate)
the appropriate MD5 response to the prompt?



Michael - N6MEF

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