By ssh -v -v ... Corona688 wants you to increase the verbosity of the command output. It's easier for debugging.
Ok thanks for the explanation. As i understand, the function of the below codes is as explained
As i am suspecting that the authorized_keys is getting deleted from server 2 after 24 hrs(hence it is again asking for password while doing ssh from server 1). Shall i first check for the deletion of that file first and then run these commands(ssh -v -v) if the file has been deleted?
I am trying to set up ssh/scp to be able to login in w/o using a password. The man pages for ssh and ssh-keygen explain how to do this.
So, using "rsa1" style, I created the public and private keys by way of ssh-keygen, then added the contents of "$HOME/.ssh/identity.pub" to a newly created... (6 Replies)
Hi Gurus,
Wanted to know if there is a way to enable passwordless login between specific users in a Solaris (5.9)server.
I copied the public key of first user into the $HOME/.ssh/authorized_keys file of the second user. But it didn't work out.
Note - Am talking about users in the same... (9 Replies)
Hi GUYS,
Me have 2 servers, eg:: A & B
id_dsa.pub key of B had been put in authorized_keys of A & Vice versa
Passwordless login going from A to B.
But while connecting from B to A ,its asking password
Any one please help me out.. (6 Replies)
Greetings!
I am trying to perform a passwordless SSH login from a HPUX 11.31 client to a HPUX 11.31 server. Whenever I do a "ssh -l root serverA" from the client, I am prompted for a password. Giving the password, I am able to successfully login. However I am trying to accomplish a... (9 Replies)
Hi,
I have two users login on my HPUX i.e user1 and user2.
Inorder to switch from user1 to user2 without password I generated key pair using keygen command for user id user1 and copied the its public key to the .ssh/authorized_keys file of user2.
ssh-keygen -b 2048 -t rsa
This... (5 Replies)
This is Solaris 10 and sorce+destination are non root user. Somehow it is broke and I am not able to fix it. Already checked permissions on both servers and authorized_keys entry of destination is same as id_rsa.pub of source server. I can not regenerate keys on source server because I do not know,... (0 Replies)
Hi,
I am in the process FTPing some of my report files from my production server to another FTP server through batch/Shell Script.
This is working fine with the password less authentication.
Once i place all my report files in the ftp server the end users need to download ... (3 Replies)
how can i use an expect script to do a passwordless ssh login and run a script on a bunch of remote hosts? I do not want to use public key authentication as this would require me to setup the keys on the clients etc.... (2 Replies)
Hi,
I am a newbie and has been given a task to connect to a windows server from a linux server (using putty of course; for file transfer) that too passwordless.
Searching through google I found "ssh-keygen" but this also couldn't work because as I tried ssh <username>@<windowsServerIP>, it says... (5 Replies)
Discussion started by: pratria
5 Replies
LEARN ABOUT CENTOS
ssh-keyscan
SSH-KEYSCAN(1) BSD General Commands Manual SSH-KEYSCAN(1)NAME
ssh-keyscan -- gather ssh public keys
SYNOPSIS
ssh-keyscan [-46Hv] [-f file] [-p port] [-T timeout] [-t type] [host | addrlist namelist] ...
DESCRIPTION
ssh-keyscan is a utility for gathering the public ssh host keys of a number of hosts. It was designed to aid in building and verifying
ssh_known_hosts files. ssh-keyscan provides a minimal interface suitable for use by shell and perl scripts.
ssh-keyscan uses non-blocking socket I/O to contact as many hosts as possible in parallel, so it is very efficient. The keys from a domain
of 1,000 hosts can be collected in tens of seconds, even when some of those hosts are down or do not run ssh. For scanning, one does not
need login access to the machines that are being scanned, nor does the scanning process involve any encryption.
The options are as follows:
-4 Forces ssh-keyscan to use IPv4 addresses only.
-6 Forces ssh-keyscan to use IPv6 addresses only.
-f file
Read hosts or addrlist namelist pairs from this file, one per line. If - is supplied instead of a filename, ssh-keyscan will read
hosts or addrlist namelist pairs from the standard input.
-H Hash all hostnames and addresses in the output. Hashed names may be used normally by ssh and sshd, but they do not reveal identify-
ing information should the file's contents be disclosed.
-p port
Port to connect to on the remote host.
-T timeout
Set the timeout for connection attempts. If timeout seconds have elapsed since a connection was initiated to a host or since the
last time anything was read from that host, then the connection is closed and the host in question considered unavailable. Default
is 5 seconds.
-t type
Specifies the type of the key to fetch from the scanned hosts. The possible values are ``rsa1'' for protocol version 1 and ``dsa'',
``ecdsa'' or ``rsa'' for protocol version 2. Multiple values may be specified by separating them with commas. The default is to
fetch ``rsa'' and ``ecdsa'' keys.
-v Verbose mode. Causes ssh-keyscan to print debugging messages about its progress.
SECURITY
If an ssh_known_hosts file is constructed using ssh-keyscan without verifying the keys, users will be vulnerable to man in the middle
attacks. On the other hand, if the security model allows such a risk, ssh-keyscan can help in the detection of tampered keyfiles or man in
the middle attacks which have begun after the ssh_known_hosts file was created.
FILES
Input format:
1.2.3.4,1.2.4.4 name.my.domain,name,n.my.domain,n,1.2.3.4,1.2.4.4
Output format for rsa1 keys:
host-or-namelist bits exponent modulus
Output format for rsa, dsa and ecdsa keys:
host-or-namelist keytype base64-encoded-key
Where keytype is either ``ecdsa-sha2-nistp256'', ``ecdsa-sha2-nistp384'', ``ecdsa-sha2-nistp521'', ``ssh-dss'' or ``ssh-rsa''.
/etc/ssh/ssh_known_hosts
EXAMPLES
Print the rsa host key for machine hostname:
$ ssh-keyscan hostname
Find all hosts from the file ssh_hosts which have new or different keys from those in the sorted file ssh_known_hosts:
$ ssh-keyscan -t rsa,dsa,ecdsa -f ssh_hosts |
sort -u - ssh_known_hosts | diff ssh_known_hosts -
SEE ALSO ssh(1), sshd(8)AUTHORS
David Mazieres <dm@lcs.mit.edu> wrote the initial version, and Wayne Davison <wayned@users.sourceforge.net> added support for protocol ver-
sion 2.
BUGS
It generates "Connection closed by remote host" messages on the consoles of all the machines it scans if the server is older than version
2.9. This is because it opens a connection to the ssh port, reads the public key, and drops the connection as soon as it gets the key.
BSD July 16, 2013 BSD