07-05-2012
SCP requests password despite common key
I created both a DSA and an RSA key for communication between two SSH servers. Each server has the same DSA and RSA key in their .ssh folders. Yet when copying files from one server to another using a client terminal, I get a password prompt. Why is that? What should I do to bypass the password prompt on each instance of scp?
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PAM_SSH(8) BSD System Manager's Manual PAM_SSH(8)
NAME
pam_ssh -- authentication and session management with SSH private keys
SYNOPSIS
[service-name] module-type control-flag pam_ssh [options]
DESCRIPTION
The SSH authentication service module for PAM, pam_ssh provides functionality for two PAM categories: authentication and session management.
In terms of the module-type parameter, they are the ``auth'' and ``session'' features. It also provides null functions for the remaining
categories.
SSH Authentication Module
The SSH authentication component provides a function to verify the identity of a user (pam_sm_authenticate()), by prompting the user for a
passphrase and verifying that it can decrypt the target user's SSH key 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, 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.
keyfiles Specify the comma-separated list of files in $HOME/.ssh to check for SSH keys. The default is ``id_dsa,id_rsa,identity''.
nullok Allow empty passphrases.
SSH Session Management Module
The SSH session management component provides functions to initiate (pam_sm_open_session()) and terminate (pam_sm_close_session()) sessions.
The pam_sm_open_session() function starts an SSH agent, passing it any private keys it decrypted during the authentication phase, and sets
the environment variables the agent specifies. The pam_sm_close_session() function kills 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.
FILES
$HOME/.ssh/identity SSH1/OpenSSH RSA key
$HOME/.ssh/id_dsa OpenSSH DSA key
$HOME/.ssh2/id_rsa_* SSH2 RSA keys
$HOME/.ssh2/id_dsa_* SSH2 DSA keys
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.
BSD
November 26, 2001 BSD