The project I work on implements a number of security rules to match our client’s policies. One of them is that you cannot reuse a password unless you have chosen a number of intermediate passwords in between. I won’t go into the exact number of different passwords you must choose before being able to reuse one. Let’s just assume it is 50 intermediate passwords before reusing one.
I have a lot of database accounts in the development and test environment. It is a challenge to remember the passwords for all of them. So I choose a passwords format that makes it easy for me to remember them. This plan gets foiled every time I am forced to change my password for whatever reason. At that point I cannot change my password back to the well known format. I must have a lot of different passwords before reusing the one I know.
Since I am a developer, I figure I can write a script to help me with this problem. I loop through 50 iterations. I use a sequence to generate a random sequence. Then I ALTER USER to change the password in the loop. At the end, I change the password back to the one I want to reuse. I bang out this code really quickly. I am pleased when the script executes to completion. However, the script fails when it tries to reuse my password. I get an ORA-28007: “the password cannot be reused” error.
This perplexes me for a while. I am successfully changing my password to a bunch of unique values for 50 times. So I should be able to reuse the old one. I guess that maybe somebody has messed up the profile which restricts password reuse. No. The profile still says I can reuse after 50 different passwords are used. Then I see the problem. In addition to the PASSWORD_RESUSE_MAX parameter that makes me choose 50 intermediate passwords, there is also a PASSWORD_REUSE_TIME parameter that prevents me from reusing the same password too soon. I had forgot about that rule.
A true hacker does not give up so easily. I was trying to emulate a user switching the password a bunch of times. That was the wrong approach. Instead I need to switch my profile to a different one, such as the DEFAULT. Then I can bypass all the password rules. This feels wrong. But you have to do what you have to do. These are development accounts anyway.
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