Question

PasswordRecovery control temporary password format

Asked by: akobes05

I was wondering if there was any way to limit the length, of even the possible characters, of the temporary password assigned by the PasswordRecovery control.  Some users just do not like seeing there temporary pasword be over 16 characters long.

- Thanks

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Asked On
2008-05-08 at 14:10:36ID23387724
Tags

password

,

passwordrecovery

,

control

,

temporary

,

format

Topics

Programming for ASP.NET

,

Microsoft Visual Basic.Net

,

.NET Framework 2.x

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: sajain84Posted on 2008-05-08 at 14:34:11ID: 21528672

Hi akobes05,

Asp.Net takes the password generation parameters from the Web.Config file.
If you want to change the minimum and maximum length, you'll have to do this via a regular expression.

The minimum length can be specified without the regular expression, but for the maximum length - the regular expression will be required.
In addition to the length, the regular expression can also be used to set rules to which the password should match.

Something like the code attached below.

The code below is not complete -- and is just a representation of how it should be.
The 8 is the minimum length and 10 is the maximum length.

You will also have to replace the regular expression with a different one suiting your needs.

Links:
More reading: http://www.securityguidanceshare.com/wiki/ASP.NET_2.0_Security_Questions_and_Answers_-_Authentication#How_do_I_enforce_strong_passwords_using_membership_feature_in_ASP.NET_2.0

Regular Expression Library:
http://regexlib.com/

<membership ...>
   <providers>
      <add passwordStrengthRegularExpression= 
                    "^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$" .../>
   </providers>
</membership>

                                              
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by: akobes05Posted on 2008-05-08 at 14:48:04ID: 21528751

Please correct me if I am wrong, but isn;t this used to enforce the passwords being entered when users register?  How is this used for the temporay password generated by the password recovery control?

Is there a way to just enforce the minimum pasword length on registration, but on password retrieveal limit the length of the auto generated password?

 

by: TornadoVPosted on 2008-05-08 at 20:02:32ID: 21530180

I'm not sure there is a way to control temporary password lenght, but why not create a more user friendly temporary password "by hand"?

IMHO this is a very elegant solution: http://forums.asp.net/p/965209/1206792.aspx#1206792
and here:
http://forums.asp.net/p/1029854/1412044.aspx

Hope this helps.

 

by: sajain84Posted on 2008-05-08 at 22:27:59ID: 21530544

Hmm ...

I'm sorry for my reply above -- I changed the web.config in a project of mine and it seemed to work for me.
I guess I should have tested it more thoroughly ...

Anyways, have you tried the following?
You will need to create the password here yourself.

Do let me know if it works for you.
Also, are you using the default Membership provider or a custom written one?

private void ResetPassword() {
	MembershipUser mu = ReturnMember(txtUsername.Text.Trim());
 
	if (mu == null) {
		return;
	}
 
	string newPassword = mu.ResetPassword();
	Membership.UpdateUser(mu);
	
	string friendlyPassword = GenerateNewFriendlyPassword(); // Your random password generation method here
	mu.ChangePassword(newPassword, friendlyPassword);
	Membership.UpdateUser(mu);
	
}

                                              
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by: sajain84Posted on 2008-05-08 at 22:32:45ID: 21530553

I'm sorry for this line of code in the snippet above:

MembershipUser mu = ReturnMember(txtUsername.Text.Trim());

The ReturnMember() method returns me a membership user I want to reset the password for.
You could substitute this with:

MembershipUser mu = Membership.GetUser(userName);

So, the proper code would be as follows:

private void ResetPassword(string userName) {
	MembershipUser mu = Membership.GetUser(userName);
 
	if (mu == null) {
		return;
	}
 
	string newPassword = mu.ResetPassword();
	Membership.UpdateUser(mu);
	
	string friendlyPassword = GenerateNewFriendlyPassword(); // Your random password generation method here
	mu.ChangePassword(newPassword, friendlyPassword);
	Membership.UpdateUser(mu);
	
}

                                              
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