The edgeos_config module had a list of commands to filter out to avoid
load failures. This list had a single regular expression which caught
commands that attempted to set pre-encrypted passwords. This behavior is
undesirable for a few reasons.
* It's poorly documented. The documentation makes cryptic mention of a
return value that some commands might be filtered out, but offers no
explanation as to what they are or why.
* It's hard-coded. There's no way for the user to change or disable this
functionality, rendering the commands caught by that expression
completely unusable with the edgeos_config module.
* The obvious workaround is unsafe. The filter catches passwords that
are already encrypted, but is perfectly fine letting the user set
plain-text passwords. EdgeOS will encrypt them upon commit, but this
module encourages unsafe handling of secrets up to that point.
* It's a security vulnerability if the user doesn't know about this
behavior. While the module will warn if commands are filtered, the
user won't know what got filtered out until after the fact, and may
easily miss that warning if they are not vigilant. For something as
sensitive as setting a password, it's not hard to imagine naive use of
this module resulting in incorrect credentials being deployed.
* It provides no discernible benefit. Using the module without filtering
does not result in load failures. If those commands are indeed harmful
for some reason on (old?) versions of EdgeOS, it should be incumbent
upon the user to be scrupulous in what commands they issue, rather
than the module maintaining a blacklist of possible ways the user
might misuse their own system.
