Question

SSH login without password fails

Asked by: rwiersma64

I'm trying to setup a password-less login using SSH on Solaris8
I've installed OpenSSH_3.6.1p1, SSH protocols 1.5/2.0 on 2 servers.
SSH works fine when providing remote passwords.

To set up password less logins I've done the following:

1) cd ~/.ssh
2) ssh-keygen -t dsa -f id_dsa
3) scp id_dsa.pub <remote-server>:~/.ssh/authorized_keys

Testing the password-less login fails since the test-command "ssh <remote-server> pwd" still prompts me for a password.

Anyone any clues?
Ron

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Asked On
2003-08-19 at 04:38:37ID20713692
Tags

ssh

,

password

,

without

,

login

Topic

Unix Network Security

Participating Experts
2
Points
250
Comments
9

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Answers

 

by: liddlerPosted on 2003-08-19 at 05:35:50ID: 9180429

First run
ssh -v -v <remote server >
and look at the output
Also on remote server, kill sshd and run
sshd -d -d
You may have to enable telnet while you do this, if it's disabled.
You can then get error messages from ssh in verbose mode (-v -v) and sshd in debug mode (-d -d)
typically, it it a file permission problem. ssh is very strict about file ownership / permissions.

If you don't understand the output from ssh or sshd, post it here for us to take a look

 

by: rwiersma64Posted on 2003-08-19 at 06:15:15ID: 9180644


Here's (part of) my "ssh -v -v output":
-----------------------------------------------
OpenSSH_3.6.1p1, SSH protocols 1.5/2.0, OpenSSL 0x0090702f
debug1: Reading configuration data /usr/local/etc/ssh_config
debug1: Rhosts Authentication disabled, originating port will not be trusted.
debug2: ssh_connect: needpriv 0
debug1: Connecting to aamfinance [10.56.29.244] port 22.
debug1: Connection established.
debug1: identity file /u01/app/oracle/.ssh/identity type -1
debug1: identity file /u01/app/oracle/.ssh/id_rsa type -1
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug2: key_type_from_name: unknown key type '-----END'
debug1: identity file /u01/app/oracle/.ssh/id_dsa type 2
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.6.1p1
debug1: match: OpenSSH_3.6.1p1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.6.1p1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 132/256
debug2: bits set: 1607/3191
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'aamfinance' is known and matches the RSA host key.
debug1: Found key in /u01/app/oracle/.ssh/known_hosts:1
debug2: bits set: 1530/3191
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /u01/app/oracle/.ssh/identity
debug1: Trying private key: /u01/app/oracle/.ssh/id_rsa
debug1: Offering public key: /u01/app/oracle/.ssh/id_dsa
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug2: we did not send a packet, disable method
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug2: we did not send a packet, disable method
debug1: Next authentication method: password
oracle@aamfinance's password:
debug2: we sent a password packet, wait for reply
Connection closed by 10.56.29.244
debug1: Calling cleanup 0x2c95c(0x0)

Here the complete "sshd -d -d output":
-------------------------------------------------
debug2: read_server_config: filename /usr/local/etc/sshd_config
debug1: sshd version OpenSSH_3.6.1p1
debug1: private host key: #0 type 0 RSA1
debug1: read PEM private key done: type RSA
debug1: private host key: #1 type 1 RSA
debug1: read PEM private key done: type DSA
debug1: private host key: #2 type 2 DSA
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
Generating 768 bit RSA key.
RSA key generation complete.
debug1: Server will not fork when running in debugging mode.
Connection from 10.72.28.216 port 36503
debug1: Client protocol version 2.0; client software version OpenSSH_3.6.1p1
debug1: match: OpenSSH_3.6.1p1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-1.99-OpenSSH_3.6.1p1
debug2: Network child is on pid 24249
debug1: permanently_set_uid: 1004/102
debug1: list_hostkey_types: ssh-rsa,ssh-dss
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
debug2: monitor_read: 0 used once, disabling now
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug2: dh_gen_key: priv key bits set: 129/256
debug2: bits set: 1578/3191
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug2: bits set: 1597/3191
debug2: monitor_read: 4 used once, disabling nowdebug1: SSH2_MSG_KEX_DH_GEX_REPLY sent

debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user oracle service ssh-connection method none
debug1: attempt 0 failures 0
debug2: monitor_read: 6 used once, disabling nowdebug2: input_userauth_request: setting up authctxt for oracle

debug1: Starting up PAM with username "oracle"debug2: input_userauth_request: try method none

debug1: PAM setting rhost to "aamfinance-qa"
debug2: monitor_read: 41 used once, disabling now
debug2: monitor_read: 3 used once, disabling now
Failed none for oracle from 10.72.28.216 port 36503 ssh2
Failed none for oracle from 10.72.28.216 port 36503 ssh2
debug1: userauth-request for user oracle service ssh-connection method publickey
debug1: attempt 1 failures 1
debug2: input_userauth_request: try method publickey
debug1: test whether pkalg/pkblob are acceptable
debug1: temporarily_use_uid: 1001/101 (e=0/1)
debug1: trying public key file /u01/app/oracle/.ssh/authorized_keys
Authentication refused: bad ownership or modes for file /u01/app/oracle/.ssh/authorized_keys
debug1: restore_uid: 0/1
debug1: temporarily_use_uid: 1001/101 (e=0/1)
debug1: trying public key file /u01/app/oracle/.ssh/authorized_keys2
Authentication refused: bad ownership or modes for file /u01/app/oracle/.ssh/authorized_keys2
debug1: restore_uid: 0/1
debug2: userauth_pubkey: authenticated 0 pkalg ssh-dss
Failed publickey for oracle from 10.72.28.216 port 36503 ssh2
debug1: userauth-request for user oracle service ssh-connection method keyboard-interactive
debug1: attempt 2 failures 2
debug2: input_userauth_request: try method keyboard-interactive
debug1: keyboard-interactive devs
debug1: auth2_challenge: user=oracle devs=
debug1: kbdint_alloc: devices ''
debug2: auth2_challenge_start: devices
Failed keyboard-interactive for oracle from 10.72.28.216 port 36503 ssh2

 

by: liddlerPosted on 2003-08-19 at 06:21:55ID: 9180688

>>Authentication refused: bad ownership or modes for file /u01/app/oracle/.ssh/authorized_keys2
That's the naughtly line, must be owned by oracle and only writeable by oracle, not by group.
If you are still not sure post the output of:
 ls -la /u01/app/oracle/.ssh

 

by: rwiersma64Posted on 2003-08-19 at 06:33:09ID: 9180760

ls -la output:
Total 10
drwxr-xr-x   2 oracle   dba          512 Aug 19 13:48 .
drwxrwxr-x   9 oracle   dba          512 Aug 19 14:45 ..
-rw-rw-r--   1 oracle   dba          610 Aug 19 11:46 authorized_keys
-rw-rw-r--   1 oracle   dba          610 Aug 19 13:48 authorized_keys2
-rw-rw-r--   1 oracle   dba          469 Aug 19 11:46 known_hosts

By the way: I already tried some chmod-variants but the last thing I read was the the authorized_keys* file ought to be 664, so that's what you see here.
So what you're saying is I have to change this to 600 ?
By the way2: the authorized_keys2 file was originally not present, I copied authorized_keys to authorized_keys2 myself (wich was another suggestion I read somewhere).

 

by: liddlerPosted on 2003-08-19 at 06:42:31ID: 9180841

644 will do, it the group write that ssh objects to.

 

by: rwiersma64Posted on 2003-08-19 at 06:47:13ID: 9180876

After chmod 600 ~/.ssh/*keys* I get:

debug1: trying public key file /u01/app/oracle/.ssh/authorized_keys
Authentication refused: bad ownership or modes for directory /u01/app/oracle
debug1: restore_uid: 0/1
debug1: temporarily_use_uid: 1001/101 (e=0/1)
debug1: trying public key file /u01/app/oracle/.ssh/authorized_keys2
Authentication refused: bad ownership or modes for directory /u01/app/oracle

 

by: liddlerPosted on 2003-08-19 at 07:10:37ID: 9181020

probably /u01/app/oracle had group write
chmod 755 /u01/app/oracle

 

by: rwiersma64Posted on 2003-08-19 at 07:30:49ID: 9181174

Thanks a lot, this did the trick (it always seems to easy afterwards).
But again, thanks a lot.
Kind regards,
Ron

 

by: ocastillaPosted on 2005-03-02 at 10:49:41ID: 13442566

Please,

Do yuo have the process to implement the SHA1 method to crypt on solaris 8 ?
I like to encrypt passwords or strings.

Regards
Oscar

20120131-EE-VQP-002

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