Question

Configure SSH for User Equivalence

Asked by: lbinsoon

Hi,
   During the installation of Oracle RAC 10g Release 2, OUI needs to copy files to and execute programs on the other nodes in the cluster. In order to allow OUI to do that, I must configure SSH2 to allow user equivalence. Establishing user equivalence with SSH2 provides a secure means of copying files and executing programs on other nodes in the cluster without requiring password prompts. After i had performed the below steps, when i "ssh2 oracle@serverA or B" i still prompt me for password. Anyone know where could have go wrong?

Thank You.

Below are the steps that i had performed:

#Both Node
mkdir ~/.ssh2
chmod 755 ~/.ssh2

ssh-keygen2 -t rsa
ssh-keygen2 -t dsa

#First Node
cat ~/.ssh2/id_rsa_2048_a.pub >> ~/.ssh2/authorized_keys
cat ~/.ssh2/id_dsa_2048_a.pub >> ~/.ssh2/authorized_keys

ssh2 oracle@serverA cat ~/.ssh2/id_rsa_2048_a.pub >> ~/.ssh2/authorized_keys
ssh2 oracle@serverA cat ~/.ssh2/id_dsa_2048_a.pub >> ~/.ssh2/authorized_keys
chmod 644 ~/.ssh/authorized_keys

#Second Node
cat ~/.ssh2/id_rsa_2048_a.pub >> ~/.ssh2/authorized_keys
cat ~/.ssh2/id_dsa_2048_a.pub >> ~/.ssh2/authorized_keys

ssh2 oracle@serverB cat ~/.ssh2/id_rsa_2048_a.pub >> ~/.ssh2/authorized_keys
ssh2 oracle@serverB cat ~/.ssh2/id_dsa_2048_a.pub >> ~/.ssh2/authorized_keys
chmod 644 ~/.ssh2/authorized_keys

#Both Node
exec ssh-agent2 $SHELL
/opt/ssh2/bin/ssh-add2

#Both Node
ssh2 oracle@serverB
ssh2 oracle@serverA

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Asked On
2006-08-16 at 21:02:32ID21957438
Tags

equivalence

,

ssh

,

user

Topic

Unix Network Security

Participating Experts
4
Points
50
Comments
15

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Answers

 

by: mr_egyptianPosted on 2006-08-17 at 00:37:48ID: 17332207

I think you'll need to generate keys to authenticate against with ssh-keygen. Here's a link I found for Red Hat. Probably pertinent regardless...

 

by: mr_egyptianPosted on 2006-08-17 at 00:45:37ID: 17332238

 

by: TintinPosted on 2006-08-17 at 14:23:54ID: 17337763

What OS are you running?

Generally your ssh settings all live under ~/.ssh

Doing ssh-keygen will create a .ssh directory for you if it doesn't exist.

I assume you have two ssh versions on your server if you are using ssh2 and ssh-keygen2, so perhaps .ssh2 is appropriate for your ssh version.

Generally, the most important factor is the permissions.  Make sure ~/.ssh2 has perms of 700.  Additionally, sometimes the home directory needs to have minimum perms of 755.

 

by: lbinsoonPosted on 2006-08-17 at 18:25:41ID: 17339228

Hi,
    I had already set to 755 for the .ssh2 folder.
    Do i miss out anything?

drwxr-xr-x   3 oracle10g dba          512 Aug 16 16:45 .ssh2

 

by: TintinPosted on 2006-08-17 at 18:34:50ID: 17339264

.ssh2 should be 770 and $HOME set to a minimum of 755 (of course this all depends on your ssh server and associated configuration)

 

by: lbinsoonPosted on 2006-08-17 at 19:09:30ID: 17339413

Hi,
   Seems like all the respective folders permission and right are in order.
   What could be the possible reason?

   Thank You.

 

by: TintinPosted on 2006-08-17 at 21:12:39ID: 17339929

What's the output of

ssh2 -v oracle@serverB

 

by: nociPosted on 2006-08-18 at 07:00:36ID: 17342380

Too much permissions will prevent ssh daemon from using a directory.

The .ssh/.ssh2 directory is considered private, and any world access bits set will prevent
sshd from using that directory.
Also the private key files there SHOULD be 700 or 600 otherwise they will not be used.

 

by: lbinsoonPosted on 2006-08-20 at 19:40:04ID: 17353359

Hi,
   As requested, pease refer to below:

serverB /appl/users/oracle10g >ssh2 -v oracle@slasun03
debug: SshConfig/sshconfig.c:3072/ssh2_parse_config_ext: Metaconfig parsing stopped at line 3.
debug: SshConfig/sshconfig.c:3364/ssh_config_read_file_ext: Read 2 params from config file.
debug: Ssh2/ssh2.c:1759/main: User config file not found, using defaults. (Looked for '/appl/users/oracle10g/.ssh2/ssh2_config')
debug: Connecting to slasun03, port 22... (SOCKS not used)
debug: Ssh2Transport/trcommon.c:3748/ssh_tr_create: My version: SSH-1.99-3.2.9 F-SECURE SSH 3.2.3
debug: client supports 4 auth methods: 'hostbased,publickey,keyboard-interactive,password'
debug: Ssh2Common/sshcommon.c:588/ssh_common_wrap: local ip = 10.51.101.5, local port = 40904
debug: Ssh2Common/sshcommon.c:590/ssh_common_wrap: remote ip = 10.51.101.3, remote port = 22
debug: SshConnection/sshconn.c:1945/ssh_conn_wrap: Wrapping...
debug: SshReadLine/sshreadline.c:2420/ssh_readline_eloop_initialize: Initializing ReadLine...
debug: Remote version: SSH-2.0-3.2.9 F-SECURE SSH 3.2.3
debug: Major: 3 Minor: 2 Revision: 9
debug: Ssh2Transport/trcommon.c:1377/ssh_tr_negotiate: lang s to c: `', lang c to s: `'
debug: Ssh2Transport/trcommon.c:1443/ssh_tr_negotiate: c_to_s: cipher aes128-cbc, mac hmac-sha1, compression none
debug: Ssh2Transport/trcommon.c:1446/ssh_tr_negotiate: s_to_c: cipher aes128-cbc, mac hmac-sha1, compression none
debug: Remote host key found from database.
debug: Ssh2Common/sshcommon.c:380/ssh_common_special: Received SSH_CROSS_STARTUP packet from connection protocol.
debug: Ssh2Common/sshcommon.c:430/ssh_common_special: Received SSH_CROSS_ALGORITHMS packet from connection protocol.
debug: server offers auth methods 'hostbased,password'.
debug: Ssh2AuthHostBasedClient/authc-hostbased.c:595/ssh_client_auth_hostbased: Starting hostbased auth...
debug: SshConfig/sshconfig.c:2979/ssh2_parse_config_ext: Unable to open /etc/ssh2/sshd2_config
debug: Ssh2AuthHostBasedClient/authc-hostbased.c:624/ssh_client_auth_hostbased: Failed to read config file /etc/ssh2/sshd2_config
debug: Host key pair is not specified, trying to use default 'hostkey'.
debug: SshHostKeyIO/sshhostkeyio.c:194/ssh_host_key_read_keys: Reading public host key from /etc/ssh2/hostkey.pub
debug: SshHostKeyIO/sshhostkeyio.c:279/ssh_host_key_read_keys: Host key algorithms (from disk): ssh-dss
debug: SshSigChld/sigchld.c:238/ssh_sigchld_register: Registering handler for pid 29971.
debug: Ssh2AuthHostBasedClient/authc-hostbased.c:133/hostbased_init_pubkey: Trying "hostbased" authentication with `ssh-dss' key.
debug: Ssh2AuthHostBasedClient/authc-hostbased.c:805/ssh_client_auth_hostkeys_initialized: Child: Execing ssh-signer...(path: /opt/ssh2/bin/ssh-signer2)
debug: Ssh2AuthHostBasedClient/authc-hostbased.c:448/auth_hostbased_received_packet: ssh-signer returned SSH_AUTH_HOSTBASED_SIGNATURE
debug: server offers auth methods 'hostbased,password'.
debug: Ssh2AuthHostBasedClient/authc-hostbased.c:667/ssh_client_auth_hostbased: Server rejected the signature.
debug: Ssh2AuthClient/sshauthc.c:319/ssh_authc_completion_proc: Method 'hostbased' disabled.
debug: Ssh2AuthHostBasedClient/authc-hostbased.c:110/hostbased_init_pubkey: No more keys to try.
debug: ssh_pipe_stream_destroy
debug: server offers auth methods 'hostbased,password'.
debug: Ssh2AuthPasswdClient/authc-passwd.c:105/ssh_client_auth_passwd: Starting password auth...
oracle's password:

 

by: nociPosted on 2006-08-22 at 04:13:44ID: 17362578

This is f-secure ssh, it doesn't work with the authorized keys file.

On the client side it needs to be configured differently, I have nome access to such a system
please see page 34 in this document:

http://www.symbolic.it/download/f-secure/docs/f-secure_ssh_client_unix.pdf#search=%22hostbased%22

 

by: ahoffmannPosted on 2006-08-28 at 05:07:46ID: 17403210

> .ssh2 should be 770 and $HOME set to a minimum of 755 ..
.ssh should be 700 and ~ (aka $HOME, sometimes) should be 750 or better (755 works in rare cases too)
ssh is pedantic, for obvious security reason ;-)

 

by: TintinPosted on 2006-08-28 at 16:05:27ID: 17408124

My mistake.  I meant 700 instead of 770.

20120131-EE-VQP-002

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