It still doesn't let me explicitly allow/prevent people SFTP access though. They would merely have to re-direct to the alternate port, and that sort of info will need to be published to those people/servers that we do want to have SFTP access.
For a server to have access, we'd have to update the client side ssh_config I suppose, but that will mean any user of that server could then open the connection to the alternate SSH port that we want to protect by default.
Am I missing something? By the way, I'm hoping that any SSH connection with a command will execute /etc/profile first. Is that the case? If not, then I'm lost, because a user could just:-
Am I just depressing myself unnecessarily?
HI,
We are facing a problem while trying to login using ssh.
The user is able to login using telnet.
We are able to login as another user using ssh and then su to that user which is successfull.
What should i be checking for the user to be able to login directly using ssh.
Thanks in... (2 Replies)
I want to login to server using ssh or telnet and execute one command then exit to the shell
Please let me know how to write script for this? (1 Reply)
1)
ssh a@b
echo $USER it display the correct value as a (even though i have not defined it in .profile)
2)
remsh b -l a
echo $USER it does not display the value as a (variable is not set
any idea why $USER variable is not initialized when i login via remsh or rlogin but shows the... (10 Replies)
I wrote this korn script and ran into a hole. I can use find to exclude all the hidden directories and to use my include file/exclude files for running a full backup
find / -depth -ipath '/home/testuser/.*' -prune -o -print| grep -f include.mydirs | grep -v -f exclude.mydirs
but when I... (8 Replies)
I want to know if there is any way to set up a users home directory access with a restricted shell and allow them to SFTP to the directory. I want to allow the user to SSH into their home directory but no where else on the AIX server. I also want the user to be able to SFTP files to their home... (1 Reply)
Hi,
I want to suppress ssh login logs of a particular user to get logged in /var/adm/syslog/syslog.log
As am using a user to monitor a server over ssh in 5 miute interval..and that creating un-necessary logs in my syslog.log file .. Please help me if there any way I can suppress this logs only... (6 Replies)
Hi,
I am trying to restrict an ssh-user to execute unwanted commands using ssh from a remote host a. So for that I am using the forced command in the authorized_keys file that will allow the ssh-user to only execute a particular command.
If I did not set this, I am able to login via ssh and... (2 Replies)
HI Community.
I was trying to create ssh password less authentication for one user called night and it's not working for me.
These are the steps I followed:-
I have logged into the server and issued ssh-ketgen -t rsabash-3.2$ ssh-keygen -t rsa
Generating public/private rsa key pair.... (4 Replies)
hi
I have a few folders and a few files , for example
Directory A B C D E
Files 1 2 3 4 5
I want B directory and "2" File that does not sync
But other directories and file sync
What is the solution ?
Is there a way to sync time is under one minute?
os centos 6.8
thanks... (5 Replies)
As I do a ssh <nis_user>@server1 from server2, ssh prompts for certificates (as expected the first time), then it prompts for the users password, as soon as I enter the password, I get a Connection to server1 closed by remote host, and connection to server1 closed. and I disconnect back to the... (3 Replies)
Discussion started by: mrmurdock
3 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