Can anyone help me please. I want to disable SSH direct access for an AIX user.
For example, if I have USER1 and USER2. I want to disactivate direct access for USER2. The user must enter his login (USER1) and his password and then he can do
.
I have just set up a user on our system HP-Thru64. The user needs to be able to su to root after they login and this works fine. Users cannot login from root externally so you have to first connect as a user and then su. I am wondering is it possible for me to prevent the user from having telnet... (4 Replies)
Hi Guys....
I am a newbie to unix. I have a requirement. I have a server. I have to configure ssh to disable direct root login and then add a user with sudo access to this server.Then change the ssh port to 22315 and the server should permit the ssh only from my local machine ip.I also have to... (1 Reply)
Hey
Is there any way to differentiate if a user is logged directly into a UNIX functional account or if they have scsu'ed into the functional account?
Cheers
Paul (2 Replies)
I've run into an issue running rsync remotely via SSH/sudo ...
I get the error sudo: sorry, you must have a tty to run sudo
I know that I can disable the tty in sudoers file ( !requiretty),
but my question is: is there a security risk by disabling requiretty with SSH/rsync/sudo?
Is... (0 Replies)
Hi,
I am planning to disable SNMP in our AIX LPARs. wanted to see by disabling in a test LPAR.
before that, I would like to check disabling this SNMP will impact any of our application or database in anyway. what kind of other software depends on these SNMP daemons ?
Can you please let me... (9 Replies)
I would like to disable X11 session forcefully. I have tried the following things:
1. Setting appropriate DISPLAY variable in the /etc/environment file to be "0.0"
2. I have tried setting the sshd_config parameter X11Forwarding to be "no"
This session communication is happening by exchanging... (2 Replies)
Hello,
I would like to confirm whether the below procedure is correct.
disabled direct super user access on AIX server using below procedure. Please let me know if there is any additional step.
1) confirm the access to HMC, console to reach the LPARs
2) chuser rlogin=false root
... (3 Replies)
Hello. I recently upgraded to a new Power 8 server and running AIX 7.1.
I migrated from an IBM P520 and AIX 5.5.
My application on the P520 works best if I direct print, it doesn't work well with spooling. My IBM rep set up the new Power 8 server with spooling which is causing an issue.... (4 Replies)
Hi,
I have setup password less login to sudo for a particular group. if I do sudo /usr/local/sbin/group it will take me to the group without password. Recently i executed a command scl_source as source scl_source enable devtoolset-7. After that my sudo is asking password not sure why
sudo... (2 Replies)
Discussion started by: arunkumar_mca
2 Replies
LEARN ABOUT DEBIAN
pam_ssh
PAM_SSH(8) BSD System Manager's Manual PAM_SSH(8)NAME
pam_ssh -- authentication and session management with SSH private keys
DESCRIPTION
The SSH authentication service module for PAM, pam_ssh provides functionality for two PAM categories: authentication and session management.
SSH Authentication Module
The SSH authentication component verifies the identity of a user by prompting the user for a passphrase and verifying that it can decrypt at
least one of the user's SSH login keys using that passphrase.
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, then
that password is used to decrypt the user's SSH login keys. If this fails, then the authentication module returns
failure without prompting the user for a passphrase.
try_first_pass Similar to the use_first_pass option, except that if the previously obtained password fails to decrypt any of the SSH
login keys, then the user is prompted for an SSH passphrase.
try_first_pass has no effect if pam_ssh is the first module on the stack, or if no previous modules obtained the
user's password.
allow_blank_passphrase Allow SSH keys with no passphrase.
If neither use_first_pass nor try_first_pass is specified, pam_ssh will unconditionally ask for an SSH passphrase.
In addition to the above authentication procedure, all standard SSH keys (identity, id_rsa, id_dsa) for which the obtained password matches
will be decrypted.
SSH Session Management Module
The SSH session management component initiates sessions by starting an SSH agent, passing it any SSH login keys it decrypted during the
authentication phase, and sets the environment variables accordingly.
The SSH session management component terminates the session by killing the previously started SSH agent by sending it a SIGTERM.
The following options may be passed to the session management module:
debug syslog(3) debugging information at LOG_DEBUG level.
INFORMATION LEAKS
Be careful with the using the try_first_pass option when pam_ssh is the first authentication module because it will then leak information
about existing users without login keys: such users will not be asked for a specific SSH passphrase, whereas non-existing users and existing
users with login keys will be asked for a passphrase.
FILES
$HOME/.ssh/identity
$HOME/.ssh/id_rsa
$HOME/.ssh/id_dsa OpenSSH DSA/RSA keys decrypted by pam_ssh.
$HOME/.ssh/login-keys.d/ Location of (possibly symbolic links to) OpenSSH DSA/RSA keys used for authentication and decrypted by pam_ssh.
/var/log/auth.log Usual log file for syslog(3)SEE ALSO ssh-agent(1), syslog(3), pam.conf(5), pam(8).
AUTHORS
Andrew J. Korty <ajk@iu.edu> wrote pam_ssh. Dag-Erling Smorgrav wrote the original OpenPAM support code. Mark R V Murray wrote the original
version of this manual page. Jens Peter Secher introduced the login-key concept.
BSD November 26, 2001 BSD