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authenticate_user(3x)					 authenticate_user(3x)

       authenticate_user - authenticate user

       #include <pwd.h>
       #include <auth.h>   /* For error codes */

       int authenticate_user(user, password, line)
       struct passwd *user;
       char *password;
       char *line;

       user    The UID.

	       The password for the UID.

       line    The name of the login line as it is listed in

       The  routine  authenticates  a username/UID against a supplied password
       and returns a nonnegative integer on success.  The  value  returned  is
       the  number of failed login authentication attempts since the last suc‐
       cessful login authentication (or zero if this feature is not  enabled).
       This  routine  is  found	 in  the  library  and loaded using the -lauth

       At all security levels higher than BSD, the login  fail	count  in  the
       auth database is incremented if authentication fails, and cleared if it
       succeeds.  In addition, the account must be marked enabled  for	logins
       as  defined by the Account Mask value for A_LOGIN.  See for information
       about the Account Mask values.

       If a non-NULL value is supplied for the argument and  the  argument  is
       not  the	 empty	string,	 the function also verifies that the specified
       user is allowed access through that line. In particular, accounts  with
       UID  equal  to  zero  will only return success if the specified line is
       marked secure in the file.

       The process must have read access to the auth database to  authenticate
       users in a secure environment.

       The  process must have read/write access to the auth database to update
       the authentication fail count.

       If auth information is  being  served  through  BIND,  the  process  is
       required	 to  obtain a Kerberos ticket for that service before invoking
       this function.

       extern int errno;
       struct passwd *pwd;
       int status;

       pwd = getpwnam("root");
       status = authenticate_user(pwd, "rootpass", "/dev/console");
       if(status < 0)
	    if(errno == EPERM)
		 puts("Login failed");
	    if(status > 0)
		 printf("%d failed attempts\n", status);

Return Values
       When successful, the routine returns the number of failed login authen‐
       tication attempts since last successful login authentication.

       When an error occurs, is set and a negative error code is returned. The
       error code returned may be the same as or it may be an  extended	 error
       code defined in

       On error return may be set to one of the following values:

       [EPERM]		 Either	 the  password	is  incorrect, the password is
			 expired, the specified line needs to be secure and is
			 not, or the account is disabled and a login authenti‐
			 cation is required.

       [EINVAL]		 No authentication information for user.

       [ENOSYS]		 Security subsystem not configured correctly.

       [EACCES]		 Process does not have read access  to	the  necessary

       On  error  return  the  return value may be the same as or, if errno is
       [EPERM], it may be one of the following additional values defined in

       [A_EBADPASS]	 The supplied password was incorrect.

       [A_ESOFTEXP]	 The accounts password has expired recently.

       [A_EHARDEXP]	 The accounts password expired quite some time ago.

       [A_ENOLOGIN]	 The account is not enabled.

       [A_EOPENLINE]	 The account requires a secure line and the  specified
			 line was not marked that way in

       If  the	system	is  operating  in the BSD security level, the password
       expiration, login fail count, and account disabling  features  are  not
       available (and therefore are not used in authentication computations).

See Also
       getauthuid(3), getpwent(3), auth(5), passwd(5yp), ttys(5)


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