[806][FIX] Ensure passwords are aphanumeric

[darius-m]

Special characters in passwords may break some functionality. Celery seems to have an issue with special characters (either + or /) that cause the worker to exit without displaying any errors. Attempts to URL-escape the password seem to fail since the value is interpolated at some point and Python throws an exception since some %XX escape codes are not valid syntax.

This change reimplements the validate_config function to check that the POSTGRES password / admin password and IRIS secret key / password salt are long (longer than 30 characters) alphanumeric strings. It should not affect users of the "scripts/iris_helper.sh" helper script since the values generated by it are 32 characters long.

The old implementation was removed because the function was not called and the check section not in self looks invalid.

Closes #806

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[whikernel]

Hi @darius-m

Thanks for this PR (and all the other ones, really helpful) - for this one I'm afraid we'd stuck some users that are already using IRIS and don't have the required password length. It's a bit of a breaking change since change the DB password isn't that straightforward.

[darius-m]

Hi @whikernel

I assumed the length may be an issue, and unfortunately I don't have a good idea how this should be handled. As a stop-gap, I added the environment variable that defines the minimum length, but it's not ideal either. I think the length requirement can be removed, if it can cause too many issues; the important part is making sure (various) special characters are avoided to not break Celery.

Also, the character set can be tweaked using regexes; instead of isalnum, the contents of the password can be checked using a regex (e.g., using ^[A-Za-z0-9_]+$ would also allow the _ character, which I think is not problematic, but I have not checked).