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Operating Systems AIX Passwordless SSH problem with AIX machines
# 1  
Old 12-27-2012
[Solved] Passwordless SSH problem with AIX machines
Hello,

I am trying to setup passwordless nophrase ssh between two machines for the user id: oraprod

here is what I did for a non-root user: oraprod

whoami:
oraprod



Machine A:

Code:
ssh-keygen -t dsa

cat ~/.ssh/id_rsa.pub

# GO TO MACHINE B
create
vi ~/.ssh/authorized_keys
paste from Machine A the contents of the file id_rsa.pub
save the file

cp authorized_keys authorized_keys2
chmod 777 authorized_keys
chmod 777 authorized_keys2

Code:
Machine A

drwxrwxrwx   2 oraprod  dba             256 Dec 27 12:51 .ssh

# cd .ssh
#
#
# pwd
/home/oraprod/.ssh
# ls -ltra
total 32
drwxr-xr-x   3 oraprod  dba             256 Dec 27 10:00 ..
-rw-r--r--   1 oraprod  dba             798 Dec 27 12:47 known_hosts
-rwxrwxrwx   1 oraprod  dba             395 Dec 27 12:50 authorized_keys
-rw-r--r--   1 oraprod  dba             397 Dec 27 12:51 id_rsa.pub
-rw-------   1 oraprod  dba            1675 Dec 27 12:51 id_rsa
drwxrwxrwx   2 oraprod  dba             256 Dec 27 12:51 .



Machine B

drwxrwxrwx   2 oraprod  dba             256 Dec 27 15:52 .ssh

$ cd ~/.ssh
$ ls
authorized_keys  id_rsa           id_rsa.pub       known_hosts
$ ls -ltra
total 32
drwxr-xr-x   4 oraprod  dba             256 Dec 27 13:37 ..
-rw-r--r--   1 oraprod  dba             400 Dec 27 15:48 known_hosts
-rw-r--r--   1 oraprod  dba             395 Dec 27 15:49 id_rsa.pub
-rw-------   1 oraprod  dba            1675 Dec 27 15:49 id_rsa
-rwxrwxrwx   1 oraprod  dba             397 Dec 27 15:52 authorized_keys
drwxrwxrwx   2 oraprod  dba             256 Dec 27 15:52 .
$


REPEAT THE SAME FOR MACHINE B



Now, i read that SSH is very particular about permissions so I have changed the permissions to



Code:
~/.ssh/authorized_keys  600
~/.ssh                  700
~                       755

Note that home directory permissions are very important as well... if your home directory is writable by other users, SSHD would not accept the key.

I am logged in to Machine A:
ssh Machine_B ls -ltra

it gives me message
connection closed by host 10.x.x.x

what seems to be the issue ?

stopsrc -g ssh and then startsrc -g ssh

Machine A & Machine B /etc/ssh/sshd_config
Code:
#       $OpenBSD: sshd_config,v 1.80 2008/07/02 02:24:18 djm Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options change a
# default value.

#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

# Disable legacy (protocol version 1) support in the server for new
# installations. In future the default will change to require explicit
# activation of protocol 1
Protocol 2

# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key

# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024

# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
#LogLevel INFO
# Authentication:

#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#RSAAuthentication yes
#PubkeyAuthentication yes
AuthorizedKeysFile      .ssh/authorized_keys

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
#  similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
# IgnoreUserKnownHosts yes
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
PermitEmptyPasswords yes

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes

#KerberosTicketCleanup yes
#KerberosGetAFSToken no

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes


#UsePAM no

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
#PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
#UsePrivilegeSeparation yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS yes
#PidFile /var/run/sshd.pid
#MaxStartups 10
#PermitTunnel no
#ChrootDirectory none

#Banner none


Subsystem       sftp    /usr/libexec/sftp-server

#       X11Forwarding no
#       AllowTcpForwarding no
#       ForceCommand cvs server


SSH ON LOCALHOST

Code:
# ssh localhost
The authenticity of host 'localhost (127.0.0.1)' can't be established.
RSA key fingerprint is 71:3b:ba:cb:d1:bf:94:41:a8:6f:3a:00:10:d0:65:ca.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (RSA) to the list of known hosts.
Permission denied (publickey,keyboard-interactive).


SSH -V ON MACHINE A FOR MACHINE B
Code:
with the username oraprod

machine A
# su - oraprod
$ ssh -v test1
OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Failed dlopen: /usr/krb5/lib/libkrb5.a(libkrb5.a.so):   0509-022 Cannot load module /usr/krb5/lib/libkrb5.a(libkrb5.a.so).
        0509-026 System error: A file or directory in the path name does not exist.

debug1: Error loading Kerberos, disabling Kerberos auth.
debug1: Connecting to test1 [10.1.1.120] port 22.
debug1: Connection established.
debug1: identity file /home/oraprod/.ssh/identity type -1
debug1: identity file /home/oraprod/.ssh/id_rsa type 1
debug1: identity file /home/oraprod/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2
debug1: match: OpenSSH_5.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'test1' is known and matches the RSA host key.
debug1: Found key in /home/oraprod/.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /home/oraprod/.ssh/identity
debug1: Offering public key: /home/oraprod/.ssh/id_rsa
Connection closed by 10.1.1.120
$


machine B

# su - oraprod
$ ssh -v standby
OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Failed dlopen: /usr/krb5/lib/libkrb5.a(libkrb5.a.so):   0509-022 Cannot load module /usr/krb5/lib/libkrb5.a(libkrb5.a.so).
        0509-026 System error: A file or directory in the path name does not exist.

debug1: Error loading Kerberos, disabling Kerberos auth.
debug1: Connecting to standby [10.1.1.105] port 22.
debug1: Connection established.
debug1: identity file /home/oraprod/.ssh/identity type -1
debug1: identity file /home/oraprod/.ssh/id_rsa type 1
debug1: identity file /home/oraprod/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2
debug1: match: OpenSSH_5.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'standby' is known and matches the RSA host key.
debug1: Found key in /home/oraprod/.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /home/oraprod/.ssh/identity
debug1: Offering public key: /home/oraprod/.ssh/id_rsa
Connection closed by 10.1.1.105
$


with the username root on machine A

#hostname
standby

# ssh -v test1

OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Failed dlopen: /usr/krb5/lib/libkrb5.a(libkrb5.a.so):   0509-022 Cannot load module /usr/krb5/lib/libkrb5.a(libkrb5.a.so).
        0509-026 System error: A file or directory in the path name does not exist.

debug1: Error loading Kerberos, disabling Kerberos auth.
debug1: Connecting to test1 [10.1.1.120] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /.ssh/identity type -1
debug1: identity file /.ssh/id_rsa type 1
debug1: identity file /.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2
debug1: match: OpenSSH_5.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'test1' is known and matches the RSA host key.
debug1: Found key in /.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /.ssh/identity
debug1: Offering public key: /.ssh/id_rsa
Connection closed by 10.1.1.120
#

#hostname
test1

# ssh -v standby
# ssh -v standby
OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Failed dlopen: /usr/krb5/lib/libkrb5.a(libkrb5.a.so):   0509-022 Cannot load module /usr/krb5/lib/libkrb5.a(libkrb5.a.so).
        0509-026 System error: A file or directory in the path name does not exist.

debug1: Error loading Kerberos, disabling Kerberos auth.
debug1: Connecting to standby [10.1.1.105] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /.ssh/identity type -1
debug1: identity file /.ssh/id_rsa type -1
debug1: identity file /.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2
debug1: match: OpenSSH_5.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'standby' is known and matches the RSA host key.
debug1: Found key in /.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /.ssh/identity
debug1: Trying private key: /.ssh/id_rsa
debug1: Trying private key: /.ssh/id_dsa
debug1: Next authentication method: keyboard-interactive
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: password
root@standby's password:
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
1 unsuccessful login attempt since last login.
Last unsuccessful login: Thu Dec 27 13:05:13 SAUST 2012 on ssh from test1
Last login: Thu Dec 27 12:58:04 SAUST 2012 on /dev/pts/2 from testserver
*******************************************************************************
*                                                                             *
*                                                                             *
*  Welcome to AIX Version 5.3!                                                *
*                                                                             *
*                                                                             *
*  Please see the README file in /usr/lpp/bos for information pertinent to    *
*  this release of the AIX Operating System.                                  *
*                                                                             *
*                                                                             *
*******************************************************************************
# hostname
standby


reference:
Code:
SSH on AIX | Unix Linux Forums | AIX
Passwordless root authentication via SSH | Unix Linux Forums | AIX
passwordless ssh for non-root user??? | Unix Linux Forums | AIX
Passwordless authentication via SSH | Unix Linux Forums | AIX
https://www.unix.com/aix/105864-passw...ation-aix.html
http://www.ibm.com/developerworks/li...eyc/index.html
http://www.ibm.com/developerworks/ai...ity/index.html
http://www.ibm.com/developerworks/fo...hreadID=192840
http://www.debian-administration.org/articles/152

http://rcsg-gsir.imsb-dsgi.nrc-cnrc....et/node31.html
http://unix.ittoolbox.com/groups/tec...in-aix-1551784

Last edited by filosophizer; 12-27-2012 at 08:37 AM..
# 2  
Old 12-27-2012
Quote:
Originally Posted by filosophizer
Now, i read that SSH is very particular about permissions so I have changed the permissions to
Can You please try:
Code:
chmod 644 ~/.ssh/authorized_keys


Code:
drwx------    2 root     system          256 Dec 27 14:05 .
drwxr-xr-x    8 root     system         4096 Dec 27 13:04 ..
-rw-r--r--    1 root     system          397 May 10 2012  authorized_keys
-rw-r--r--    1 root     system          396 Nov 28 2011  authorized_keys2
-rw-------    1 root     system          668 Apr 23 2012  id_dsa
-rw-r--r--    1 root     system          604 Apr 23 2012  id_dsa.pub
-rw-------    1 root     system         1679 Apr 23 2012  id_rsa
-rw-r--r--    1 root     system          396 Apr 23 2012  id_rsa.pub
-rw-r--r--    1 root     system         9923 Oct 30 10:10 known_hosts

# 3  
Old 12-27-2012
Quote:
Originally Posted by filosophizer
vi ~/.ssh/authorized_keys
paste from Machine A the contents of the file id_rsa.pub
save the file
Actually this might be the problem: if you have copied and pasted via X-Windows methods (marking it in one window and middle-click in the other) your file "authorized_keys" might have line breaks in it, while the original doesn't. Check this and - in case there are indeed line breaks - remove them by using the "SHIFT-J" (join lines) command in "vi", then remove the space character vi replaces the line break with.

I hope this helps.

bakunin
# 4  
Old 12-27-2012
what I did was Ftp the id_rsa.pub_copy to server and renamed it to authorized_keys

Code:
$ hostname
standby
$
$ ls -ltra
total 48
drwxr-xr-x   3 oraprod  dba             256 Dec 27 10:00 ..
-rw-r--r--   1 oraprod  dba             798 Dec 27 12:47 known_hosts
-rw-r--r--   1 oraprod  dba             397 Dec 27 12:51 id_rsa.pub
-rw-------   1 oraprod  dba            1675 Dec 27 12:51 id_rsa
-rw-------   1 oraprod  dba             395 Dec 27 15:00 authorized_keys2
-rw-r--r--   1 oraprod  dba             397 Dec 27 17:08 authorized_keys_S_105
-rw-r--r--   1 oraprod  dba             395 Dec 27 17:10 authorized_keys
drwx------   2 oraprod  dba             256 Dec 27 17:12 .

$ ls -ltra
total 72
drwx------   2 oraprod  dba             256 Dec 27 17:12 .ssh

$ ssh standby date
Connection closed by 10.1.1.105
$


$ hostname
test1
$
$
$ ls -ltra
total 48
drwxr-xr-x   4 oraprod  dba             256 Dec 27 13:37 ..
-rw-r--r--   1 oraprod  dba             400 Dec 27 15:48 known_hosts
-rw-r--r--   1 oraprod  dba             395 Dec 27 15:49 id_rsa.pub
-rw-------   1 oraprod  dba            1675 Dec 27 15:49 id_rsa
-rw-------   1 oraprod  dba             397 Dec 27 18:00 authorized_keys2
-rw-r--r--   1 oraprod  dba             395 Dec 27 20:07 authorized_keys_S
-rw-r--r--   1 oraprod  dba             397 Dec 27 20:10 authorized_keys
drwx------   2 oraprod  dba             256 Dec 27 20:12 .


$ ls -ltra
drwx------   2 oraprod  dba             256 Dec 27 20:12 .ssh

$ ssh standby date
Connection closed by 10.1.1.105

same problem even after changing the permissions and copying the file
it is not even asking for the password.
# 5  
Old 12-27-2012
Please post the log from the SSH-Server
Code:
/var/adm/authlog

and
Code:
lsuser -a login rlogin oraprod

Last edited by -=XrAy=-; 12-27-2012 at 11:02 AM..
# 6  
Old 12-27-2012
Machine A:

Code:
$ exit
# cat /var/adm/authlog
cat: 0652-050 Cannot open /var/adm/authlog.

# lsuser -a login rlogin oraprod
oraprod login=true rlogin=true

# ls -ltra /var/adm/authlog
ls: 0653-341 The file /var/adm/authlog does not exist.

Machine B:
Code:
# cat /var/adm/authlog
cat: 0652-050 Cannot open /var/adm/authlog.

# lsuser -a login rlogin oraprod
oraprod login=true rlogin=true

# ls -ltra /var/adm/authlog
ls: 0653-341 The file /var/adm/authlog does not exist.

# 7  
Old 12-27-2012
Quote:
Originally Posted by filosophizer
Machine A:
# cat /var/adm/authlog
cat: 0652-050 Cannot open /var/adm/authlog.
Please verify your Syslog-Setup (if you use syslog)
Code:
cat /etc/syslog.conf | grep auth
#       kern,user,mail,daemon, auth,... (see syslogd(AIX Commands Reference))
*.info;mail.none;user.notice;auth.none   /var/adm/syslog rotate size 5m files 10
auth.info                                /var/adm/authlog rotate size 5m files 10

If you need to change Your config, You can restart the syslogd with
Code:
stopsrc -s syslogd

and start again with
Code:
startsrc -s syslog
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