Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: /etc/shadow update password entry! ( getspent? )
Top Forums Programming /etc/shadow update password entry! ( getspent? ) Post 302211361 by nighter on Thursday 3rd of July 2008 06:35:43 AM
Old 07-03-2008
/etc/shadow update password entry! ( getspent? )
Hi i just whant to update an password entry in /etc/shadow.
But dosen't get it to work. Something is wrong! in this code.

What i try do do is if user kalle exist in shadow.
I whant it to update it's password for just that entry.

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <shadow.h>
//#include <userpw.h>

int main()
{
// -------------------------- //
// ------- passwd file ------ //
// -------------------------- //
FILE* fp;
struct passwd *p;

memset(&p, 0, sizeof(p));

if (!(fp = fopen("/etc/passwd", "a"))) {
perror("Problem ");
return(1);
}

// --------------------------- //
// ----- Password Crypt ------ //
// --------------------------- //
char salt[2];
char password[8] = "password";
char t[11];

salt[0] = 'W'; salt[1] = 'M';
strcpy(t,(char *)crypt(password, salt));

// --------------------------- //
// ------ shadow file -------- //
// --------------------------- //

FILE* fps;
struct spwd *sp;
memset(&sp, 0, sizeof(sp));
if (!(fps = fopen("/etc/shadow", "rw"))) {
perror("Problem");
return(1);
}

char user[20] = "kalle";

/* Loop thru passwd file */
while ((p = getpwent()) != NULL) {
printf("%s\n",p->pw_name);

//IF user found
if (strcmp(p->pw_name, user) == 0 ) {

if(!(sp=getspnam(p->pw_name))){
printf("user missing in shadow file");
} else {
strcpy(sp->sp_pwdp,t);
prinf("run the train %s\n",sp->sp_pwdp);
putspent(sp,fps);
}


}

}


fclose(fps);

return( EXIT_SUCCESS );
}
 

10 More Discussions You Might Find Interesting

1. 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 (2 Replies)
Discussion started by: gizaa
2 Replies

2. 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... (5 Replies)
Discussion started by: modgil
5 Replies

3. 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.... (0 Replies)
Discussion started by: progressdll
0 Replies

4. Programming

userpw.h AIX ( delete entry from the shadow password database )

HI i need to delete an entry in /etc/security/passwd. can't find a way to do it with userpw.h api ( AIX ). the passwd file i delete like this. Write all entrys to passwd file except the one we are removing. can't find any function that works like getspent / getpwent do in AIX userpw api.... (4 Replies)
Discussion started by: nighter
4 Replies

5. 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.... (8 Replies)
Discussion started by: Smith
8 Replies

6. UNIX for Dummies Questions & Answers

shadow entry

In /etc/shadow ..we have all the user entries ..? Like when ever an user is created a corresponding entry is created in /etc/shadow...? (2 Replies)
Discussion started by: rachna
2 Replies

7. 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 Replies)
Discussion started by: ksvaisakh
6 Replies

8. 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. (1 Reply)
Discussion started by: presul
1 Replies

9. 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 Replies)
Discussion started by: catalint
3 Replies

10. 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... (5 Replies)
Discussion started by: SkySmart
5 Replies

LEARN ABOUT XFREE86

pwconv

pwconv(1M)                                                System Administration Commands                                                pwconv(1M)

NAME

       pwconv - installs and updates /etc/shadow with information from /etc/passwd

SYNOPSIS

       pwconv

DESCRIPTION

       The pwconv command creates and updates /etc/shadow with information from /etc/passwd.

       pwconv relies on a special value of 'x' in the password field of /etc/passwd. This value of 'x' indicates that the password for the user is
       already in /etc/shadow and should not be modified.

       If the /etc/shadow file does not exist, this command will create /etc/shadow with  information  from  /etc/passwd.  The  command  populates
       /etc/shadow  with  the  user's  login  name,  password,  and  password  aging  information. If password aging information does not exist in
       /etc/passwd for a given user, none will be added to  /etc/shadow. However, the last changed information will always be updated.

       If the  /etc/shadow file does exist, the following tasks will be performed:

                Entries that are in the  /etc/passwd file and not in the /etc/shadow file will be added to the /etc/shadow file.

                Entries that are in the  /etc/shadow file and not in the /etc/passwd file will be removed from /etc/shadow.

                Password attributes (for example, password and aging information)  that exist in an /etc/passwd entry will be moved to the  corre-
                sponding entry in  /etc/shadow.

       The pwconv command can only be used by the super-user.

FILES

       /etc/opasswd

       /etc/oshadow

       /etc/passwd

       /etc/shadow

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       passwd(1), passmgmt(1M), usermod(1M), passwd(4), attributes(5)

DIAGNOSTICS

       pwconv exits with one of the following values:

       0        SUCCESS.

       1        Permission denied.

       2        Invalid command syntax.

       3        Unexpected failure.  Conversion not done.

       4        Unexpected failure.  Password file(s) missing.

       5        Password file(s) busy.  Try again later.

       6        Bad entry in /etc/shadow file.

SunOS 5.10                                                          9 Mar 1993                                                          pwconv(1M)
All times are GMT -4. The time now is 11:23 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy