check Linux password from /etc/shadow and C language

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Using the encrypted password of the shadow file

i have an application that uses the encrypted password that's in the /etc/shadow file. i copied the line for the particular username i was interested it in from shadow file and i pasted it into the password file of the application. the application is nagios. this application allowed that...

2. Shell Programming and Scripting

Users who have never changed their password from /etc/shadow.

Hello, I have to do a script which returns users who have never changed their password from /etc/shadow. Here is what have I done and I'm not sure if it's ok. I tried to return just users who doesn;t have password set or are locked. Can be there other kind of user who never changed the...

3. Red Hat

Shadow file password policy

Today i was going through some of security guides written on linux . Under shadow file security following points were mentioned. 1)The encrypted password stored under /etc/shadow file should have more than 14-25 characters. 2)Usernames in shadow file must satisfy to all the same rules as...

4. UNIX for Advanced & Expert Users

/etc/shadow encrypted password

Hi I wonder whether is possible to generate enrypted passwd for some user and paste it into /etc/shadow file ? What kind of encryption is used in /etc/shadow file ? ths for help.

5. Solaris

Password Recovery From /etc/shadow file

Is it possible to reset a normal user password , by editing password field in /etc/shadow file? Thanks

6. Solaris

hash password in shadow show 'x' ???

Hello, I want to know the reason behing the scene why some systems have hashed password in /etc/shadow file as "x" not the alienoid language like A1Dksxi3kaA.. (13 characters) As far as I understand, etc/password will show password as "x" and move all hashed password to etc/shadow....

7. Linux

Interpreting the encrypted shadow password?

We are currently using a script to copy the same encrypted password between our HP-UX and Solaris servers editing the trusted and shadow files directly. The encrypted password is only 13 characters long on both servers and decrypts the same way. Is there a way to copy this same string to Linux...

8. UNIX for Dummies Questions & Answers

shadow file after a password reset

hi, I had to reset a lost root password by editing the /etc/passwd and /etc/shadow files ( this is a xen vm file, so i mounted and chrooted the file ) after the reboot with an empty password on root , i have set a new password with passwd but it only changed the /etc/passwd file....

9. Shell Programming and Scripting

I want to append password in /etc/shadow file

Hi, I want to append password into /etc/shadow file using a shell script. My below script does add the users to both /etc/passwd and /etc/shadow but how can I add the hordcoded passwords to /etc/shadow file can some one help me ? # To add the groups into /etc/group file for a_user...

10. UNIX for Dummies Questions & Answers

remove shadow password

Does anyone know how to remove a stanza in the shadow password file if the user account has already been removed on an AIX box? I know it can be done by editing the file itself but I would prefer not to do it that way. cheers gizaa

LEARN ABOUT HPUX

grpck

pwck(1M)																  pwck(1M)

NAME

       pwck, grpck - password/group file checkers

SYNOPSIS

       [password [shadow]]

       [password]

       [file]

DESCRIPTION

       scans fields in the password and shadow files and reports any inconsistencies to standard error.  The checks include validation of the num-
       ber of fields, login name, user ID, group ID, and whether the login directory and optional program exist.  In addition, if the  root  entry
       shows  a  program,  it  can  only be one of: or The default password file is The default shadow file is For additional verification, use to
       check consistency between entries in the password and shadow files.

       verifies all entries in the group file and reports any inconsistencies to standard error.  This verification includes a check of the number
       of fields, group name, group ID, and whether all login names appear in the password file.  The default group file is

   Options
       recognizes the following options:

	      Check inconsistencies with the Protected Password database.
		      It calls

	      Check encrypted password lengths that are greater than 8 characters.

DIAGNOSTICS

       Group entries in with no login names are flagged.

WARNINGS

       Successful  password  file  validation is not sufficient for proper system operation.  To help maintain consistency with other system data-
       bases, editing of the password file with is discouraged.  HP recommends that you use or to edit

       HP-UX 11i Version 3 is the last release to support trusted systems functionality.

DEPENDENCIES

   NFS
       and check only the local password, shadow and group files.  The Network Information Service database is not checked.

AUTHOR

       was developed by AT&T and HP.

FILES

SEE ALSO

       authck(1M), pwconv(1M), vipw(1M), group(4), passwd(4), shadow(4).

STANDARDS CONFORMANCE

																	  pwck(1M)

Programming