Description of problem:
Colon character permitted

Version-Release number of selected component (if applicable):
1.2.60

How reproducible:
Everytime

Steps to Reproduce:
1. Start the system-config-users utility from the Gnome menu
2. Select add new user button
3. Enter the user name as TEST
4. Enter a password of 123456 in both fields
5. Enter a colon as the first character in the path field and press OK
 
Actual results:
The user creates; but, the passwd file is messed up.

Expected results:
The colon character should be rejected.  Other fields i.e. the User name stop 
the colon character. 


Additional info:

I think the colon character is only accepted when input as the first character 
of the home directory or the shell path.  Now that passwd is corrupt the system-
config-user utility no longer loads.  The detail above may not be 100% accurate 
as I am locked out, due to passwd being corrupt.  I have tried to remeber the 
steps from memory.  When I am backup I will double check and repeat the test.