Substring matching causes users to be rejected on signup?

[geeklibrarian]

Control Panel / Users and Groups

Create a user:

Full name: Scott W
User name: scottw

(Fill out the rest as needed)
Click on Register

User is added.

Now create another user:

Full name: Scott A
User name: scott

(Fill out the rest as needed)
Click on Register

The following error message results:

The login name you selected is already in use or is not valid. Please choose another.

I've been able to duplicate with any new user name by dropping the last letter from an existing user name (e.g. user name: "abcde" can't be added because user name: "abcdef" exists)

This is in a new instance, plone 3 beta on ploneout/windows, svn up'd on apr 6.

[limi]

Looks like substring matching of some sort. Wichert?

[gotcha]

Same bug exists in 2.5.2

/CMFPlone/RegistrationTool.py(227)isMemberIdAllowed()

results = pas.searchPrincipals(id=id)
if results:
   return 0

the call to searchPrincipals returns results in case of substrings

[laz]

Will check this one asap.

Maybe related to some other bugs I fixed at Sorrento ...

[laz]

not enough close related unfortunately, no time to fix this one :-(

[nouri]

Fixed in r15171 for Plone 3 -- leaving open for milestone 2.5.x

[nouri]

(In [15175]) Merge r15170:15174 from trunk into 2.5 branch. This fixes #6396