08-09-2010
Quote:
Originally Posted by
hakermania
Sometimes there are persons that you allow them to log-in from your account, aren't they?
No, never. This is a very poor practice, when UNIX has such a wide arrays of better ways to share and restrict things.
Quote:
So, to conclude, there is NO way to check user login and password from C++. Is this right???
Better to use existing systems rather than try and craft your own; probably safer too, less likely to break when the security system changes a little and less prone to bugs of a very dangerous sort. PAM, the usual Linux authentication system, might be one way. sudo would be another, since it can be configured to ask you for your own password when you try to run 'sudo something'.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I'm trying to create a program that includes variety of duties. One of the duties includes deleting a user if the user name exist in the /etc/passwd file.
how do i make that happen. those of you that know about this shell programming, please tell me what i should do after the shell reads... (4 Replies)
Discussion started by: TRUEST
4 Replies
2. UNIX for Dummies Questions & Answers
Hi Group,
Can anyone assist me with this?
I am on AIX 5.2 ML06. I create the user and assign a passwd. But I do not want the user to change the passwd at all. I like him/her to use the passwd that I have set for him/her. Any ideas would be highly appreciated!!!
Thanks. (3 Replies)
Discussion started by: brookingsd
3 Replies
3. Shell Programming and Scripting
Hello,
My issue is that I want to look for specific users that have their first and last initial followed by four numbers. For example:
ab1234
I've already got the user ID's out of the passwd file
more passwd | awk -F ":" '{print $1}' > userids
I just need to know how to just pick... (8 Replies)
Discussion started by: LinuxRacr
8 Replies
4. UNIX for Dummies Questions & Answers
Hi,
/etc/passwd file has write permission only for the root user.
Now when a normal user changes the its own password using passwd command, how this information has been written to the /etc/passwd file when the user is not having write permission to this file.
~santosh (2 Replies)
Discussion started by: santosh149
2 Replies
5. Shell Programming and Scripting
Hey all,
i have to write a script in Unix that would help me in my department to search certain user ids valid in /etc/passwd file.. here goes the exact question & data to help analyze:
Amend a script to tell the user to enter a user id to be searched for in the /etc/passwd file. If there are no... (7 Replies)
Discussion started by: ally_d
7 Replies
6. Solaris
Hello All,
How to force user to change his login passwd on his first login in solaris 10 ?
while adding user do we need to set the password in theis case?? (7 Replies)
Discussion started by: saurabh84g
7 Replies
7. UNIX for Advanced & Expert Users
Besides doing some shell-script which loops through /etc/passwd, I was wondering if there was some command that would tell me, like an enhanced version of getent.
The Operating system is Solaris 10 (recent-ish revision) using Sun DS for LDAP. (5 Replies)
Discussion started by: ckmehta
5 Replies
8. Shell Programming and Scripting
Hi,
I've a user alias file in the below format.. I need to change all the ID's that come after the = sign (with some multiple ID's which are separated by comma's) to their respective users that are contained in the passwords file.. Whats the best way to go about this.. Some sort of sed command in... (2 Replies)
Discussion started by: Jazmania
2 Replies
9. UNIX for Dummies Questions & Answers
I have logged into a box with some userid,but in this box der is no entry for this userid in /etc/passwd file.this box is used by multiple users but none of them have their enteries in passwd file but for each user there is a directory in /home
like for user1 /home/user1
for user2... (5 Replies)
Discussion started by: Jcpratap
5 Replies
10. UNIX for Advanced & Expert Users
did a big mistake, changing root entry of /etc/passwd to
root:x:0:0:root:/root:/usr/bin/tmux split-window -v \; attach
as expected, now I can't login as root anymore. sudo ed /etc/passwd etc. doesn't work.
Any idea?
Use code tags to increase readability and follow the rules. (4 Replies)
Discussion started by: dodona
4 Replies
LEARN ABOUT NETBSD
pam_unix
PAM_UNIX(8) BSD System Manager's Manual PAM_UNIX(8)
NAME
pam_unix -- UNIX PAM module
SYNOPSIS
[service-name] module-type control-flag pam_unix [options]
DESCRIPTION
The UNIX authentication service module for PAM provides functionality for two PAM categories: authentication and account management. In
terms of the module-type parameter, they are the ``auth'' and ``account'' features. It also provides a null function for session management.
UNIX Authentication Module
The UNIX authentication component provides functions to verify the identity of a user (pam_sm_authenticate()), which obtains the relevant
passwd(5) entry. It prompts the user for a password and verifies that this is correct with crypt(3).
The following options may be passed to the authentication module:
debug syslog(3) debugging information at LOG_DEBUG level.
use_first_pass If the authentication module is not the first in the stack, and a previous module obtained the user's password, that password
is used to authenticate the user. If this fails, the authentication module returns failure without prompting the user for a
password. This option has no effect if the authentication module is the first in the stack, or if no previous modules
obtained the user's password.
try_first_pass This option is similar to the use_first_pass option, except that if the previously obtained password fails, the user is
prompted for another password.
auth_as_self This option will require the user to authenticate himself as the user given by getlogin(2), not as the account they are
attempting to access. This is primarily for services like su(1), where the user's ability to retype their own password might
be deemed sufficient.
nullok If the password database has no password for the entity being authenticated, then this option will forgo password prompting,
and silently allow authentication to succeed.
UNIX Account Management Module
The UNIX account management component provides a function to perform account management, pam_sm_acct_mgmt(). The function verifies that the
authenticated user is allowed to login to the local user account by checking the password expiry date.
The following options may be passed to the management module:
debug syslog(3) debugging information at LOG_DEBUG level.
UNIX Password Management Module
The UNIX password management component provides a function to perform account management, pam_sm_chauthtok(). The function changes the
user's password.
The following options may be passed to the password module:
debug syslog(3) debugging information at LOG_DEBUG level.
no_warn suppress warning messages to the user. These messages include reasons why the user's authentication attempt was declined.
passwd_db=name Change the user's password only the specified password database. Valid password database names are:
files local password file
nis NIS password database
FILES
/etc/master.passwd default UNIX password database.
SEE ALSO
passwd(1), getlogin(2), crypt(3), getpwent(3), syslog(3), nsswitch.conf(5), passwd(5), nis(8), pam(8)
BSD
February 26, 2005 BSD