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Author SHA1 Message Date
Graham Christensen d10d8964f2 Users: add a validation step which lets the user's password be a Argon2 hashed sha1 hash. 
OWASP suggests expiring all passwords and requiring users to update their password.
However, we don't have a way to do this. They suggest this mechanism
as a good alternative:
https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#upgrading-legacy-hashes
 2021-04-16 12:32:13 -04:00
Graham Christensen 1da70030b7 Users: transparently upgrade passwords to Argon2 
Passwords that are sha1 will be transparently upgraded to argon2,
and future comparisons will use Argon2

Co-authored-by: Graham Christensen <graham@grahamc.com>
 2021-04-15 11:35:11 -04:00
Graham Christensen 29620df85e Passwords: check in constant time 
The default password comparison logic does not use
constant time validation. Switching to constant time
offers a meager improvement by removing a timing
oracle.

A prepatory step in moving to Argon2id password storage, since we'll need this change anyway after
for validating existing passwords.

Co-authored-by: Graham Christensen <graham@grahamc.com>
 2021-04-15 11:34:56 -04:00