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@krmahadevan
Created October 28, 2011 05:59
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Steps to recreate the sshj issue
1. create a ‘~/.ssh/config’ file with the following content;
#
# All hosts defaults
#
Host *
Protocol 1,2
FallBackToRsh no
ForwardAgent yes
ForwardX11 yes
PasswordAuthentication yes
RhostsAuthentication no
RhostsRSAAuthentication no
RSAAuthentication yes
NoHostAuthenticationForLocalhost yes
StrictHostKeyChecking no
KeepAlive yes
2. now for this user id, connect to a remote UNIX machine. The moment you connect to a UNIX remote machine, you will see the RSA1 come up.
3. Verify that the key got added up to your ~/.ssh/known_hosts file.
4. Create a SSHv1 compatible key pair using the command "ssh-keygen -t rsa1".
This command will create identity(private key) and identity.pub (public key) and save it under ~/.ssh folder.
5. Verify that the public key looks like a sshv1 key by running cat ~/.ssh/identity.pub
6. Now try to do a passwordless setup to a remote machine, so that no password is asked by running scp ~/.ssh/identity.pub <username>@<machinename>:~/.ssh/
7. Now append it to the authorized keys by running cat ~/.ssh/identity.pub > ~/.ssh/authorized_keys on the remote machine.
8. Verify that the passwordless setup was indeed completed by running ssh <userName>@<machineName> from your local machine, and you shouldn't be prompted for a password.
9. Now try to run the following sample program to simulate the problem from your local machine.
SSHClient client = new SSHClient();
client.loadKnownHosts();
client.connect(REMOTE_MACHINE);
client.authPassword(USERNAME, PASSWORD);
Session session = client.startSession();
Command command = session.exec("who am i");
String output = command.getOutputAsString();
System.out.println(output);
session.close();
client.close();
@hierynomus
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Hi Krishnan,

Perfect. The known_hosts file only contains an RSA1 key, which is not supported for SSHv2. Could you run with the ConsoleKnownHostsVerifier?

Adapt the code to:

SSHClient client = new SSHClient();
client.addHostKeyVerifier(new ConsoleKnownHostsVerifier());
client.loadKnownHosts();
client.connect(REMOTE_MACHINE);
client.authPassword(USERNAME, PASSWORD);
Session session = client.startSession();
Command command = session.exec("who am i");
String output = command.getOutputAsString();
System.out.println(output);
session.close();
client.close();

This should prompt you to add the key to the known_hosts file :-)

Regards,
Jeroen

@krmahadevan
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krmahadevan commented Jan 18, 2012 via email

@krmahadevan
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@jeroen

I read on google that when code is executed via eclipse, the Console would always be null and there is no way of circumventing that.

But I see this come up even when I try to run my test from the command prompt

I used

mvn clean test -Dtest=TestBugFix

@hierynomus
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Hi Krishnan,

Via any non-interactive process (Eclipse or unit test through maven) the console will be null. Could you try connecting normally to the machine (ie. on the command line execute ssh -v -v -v USER@HOST.
And then accept the key if it asks for that, and post the logging of that?

Regards,
Jeroen

@krmahadevan
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@jeroen,

Here's what I see when I tried the command that you provided me with :

LM-MAA-00387425:bluefin-gui krmahadevan$ ssh -v -v -v krmahadevan@stage2sc5403.sc4.com
OpenSSH_5.2p1, OpenSSL 0.9.8r 8 Feb 2011
debug1: Reading configuration data /Users/krmahadevan/.ssh/config
debug1: Applying options for *
debug1: /Users/krmahadevan/.ssh/config line 6: Deprecated option "FallBackToRsh"
debug1: /Users/krmahadevan/.ssh/config line 10: Deprecated option "RhostsAuthentication"
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to stage2sc5403.sc4.com [10.15.24.241] port 22.
debug1: Connection established.
debug1: identity file /Users/krmahadevan/.ssh/identity type 0
debug1: identity file /Users/krmahadevan/.ssh/id_rsa type -1
debug1: identity file /Users/krmahadevan/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH_4*
debug1: Local version string SSH-1.5-OpenSSH_5.2
debug2: fd 3 setting O_NONBLOCK
debug1: Waiting for server public key.
debug1: Received server public key (768 bits) and host key (2048 bits).
debug3: check_host_in_hostfile: filename /Users/krmahadevan/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug3: check_host_in_hostfile: filename /Users/krmahadevan/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug1: Host 'stage2sc5403.sc4.com' is known and matches the RSA1 host key.
debug1: Found key in /Users/krmahadevan/.ssh/known_hosts:1
debug1: Encryption type: 3des
debug1: Sent encrypted session key.
debug2: cipher_init: set keylen (16 -> 32)
debug2: cipher_init: set keylen (16 -> 32)
debug1: Installing crc compensation attack detector.
debug1: Received encrypted confirmation.
debug1: RSA authentication using agent refused.
debug1: Trying RSA authentication with key '/Users/krmahadevan/.ssh/identity'
debug1: Received RSA challenge from server.
debug1: Sending response to host key RSA challenge.
debug1: Remote: RSA authentication accepted.
debug1: RSA authentication accepted by server.
debug1: Requesting pty.
debug2: x11_get_proto: /usr/X11R6/bin/xauth -f /tmp/ssh-zn3lvU4w5R/xauthfile generate /tmp/launch-aAEx0D/org.x:0 MIT-MAGIC-COOKIE-1 untrusted timeout 1200 2>/dev/null
Warning: untrusted X11 forwarding setup failed: xauth key data not generated
Warning: No xauth data; using fake authentication data for X11 forwarding.
debug1: Requesting X11 forwarding with authentication spoofing.
debug1: Remote: No xauth program; cannot forward with spoofing.
Warning: Remote host denied X11 forwarding.
debug2: fd 3 setting TCP_NODELAY
debug1: Requesting authentication agent forwarding.
debug1: Requesting shell.
debug1: Entering interactive session.
debug2: fd 0 setting O_NONBLOCK
debug1: fd 0 clearing O_NONBLOCK
Last login: Wed Jan 18 07:10:30 2012 from 10.239.62.229

Red Hat Enterprise Linux Server release 5.4 (Tikanga)
[krmahadevan@stage2sc5403 ~]$ exit

@krmahadevan
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@jeroen

Please let me know if you need any further info.

-Krishnan

@hierynomus
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Hi Krishnan,

Why is you local SSH client forcing the SSHv1 protocol? Have you configured it differently?

Regards,
Jeroen

@krmahadevan
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@jeroen,

I have a config file that is residing within my ".ssh" folder whose contents are as below

All hosts defaults

Host *
Protocol 1,2
FallBackToRsh no
ForwardAgent yes
ForwardX11 yes
PasswordAuthentication yes
RhostsAuthentication no
RhostsRSAAuthentication no
RSAAuthentication yes
NoHostAuthenticationForLocalhost yes
StrictHostKeyChecking no
KeepAlive yes

Would that be the reason behind the SSH Client forcing the SSHv1 protocol ? [ My very first post in this gist does talk about having it]

@hierynomus
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Could you remove that file, and try to connect again using the ssh command I provided? And send the logs.

@krmahadevan
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@jeroen,

As per your suggestion, I removed the "config" file and retried. However this file cannot be removed from my continuous integration server hosted on a linux box, and that box does have this "config" configuration file.

Here are the logs

LM-MAA-00387425:.ssh krmahadevan$ ssh -v -v -v krmahadevan@stage2sc5403.sc4.com
OpenSSH_5.2p1, OpenSSL 0.9.8r 8 Feb 2011
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to stage2sc5403.sc4.com [10.15.24.241] port 22.
debug1: Connection established.
debug1: identity file /Users/krmahadevan/.ssh/identity type 0
debug1: identity file /Users/krmahadevan/.ssh/id_rsa type -1
debug1: identity file /Users/krmahadevan/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH_4*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.2
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,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-group14-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,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
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@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
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
debug2: dh_gen_key: priv key bits set: 124/256
debug2: bits set: 518/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /Users/krmahadevan/.ssh/known_hosts
debug2: key_type_from_name: unknown key type '2048'
debug3: key_read: missing keytype
debug3: check_host_in_hostfile: filename /etc/ssh_known_hosts
debug3: check_host_in_hostfile: filename /Users/krmahadevan/.ssh/known_hosts
debug2: key_type_from_name: unknown key type '2048'
debug3: key_read: missing keytype
debug3: check_host_in_hostfile: filename /etc/ssh_known_hosts
debug3: check_host_in_hostfile: filename /Users/krmahadevan/.ssh/known_hosts
WARNING: RSA1 key found for host stage2sc5403.sc4.com
in /Users/krmahadevan/.ssh/known_hosts:1
RSA1 key fingerprint bc:0f:e7:87:b5:da:06:19:68:a6:76:38:e1:6b:70:1b.
+--[RSA1 2048]----+
| |
| |
| . |
| ..+ . |
| . *S o |
| . E ..o . |
| + *o .+ . |
| + =..+ |
| . ++. |
+-----------------+

debug3: check_host_in_hostfile: filename /Users/krmahadevan/.ssh/known_hosts2
debug3: check_host_in_hostfile: filename /etc/ssh_known_hosts2
debug3: check_host_in_hostfile: filename /Users/krmahadevan/.ssh/known_hosts
debug2: key_type_from_name: unknown key type '2048'
debug3: key_read: missing keytype
debug3: check_host_in_hostfile: filename /etc/ssh_known_hosts
debug2: no key of type 2 for host stage2sc5403.sc4.com
The authenticity of host 'stage2sc5403.sc4.com (10.15.24.241)' can't be established
but keys of different type are already known for this host.
RSA key fingerprint is ca:0b:b3:7f:53:5a:e3:bc:bf:44:63:d8:2d:26:c0:41.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'stage2sc5403.sc4.com,10.15.24.241' (RSA) to the list of known hosts.
debug2: bits set: 509/1024
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
debug2: key: /Users/krmahadevan/.ssh/id_rsa (0x0)
debug2: key: /Users/krmahadevan/.ssh/id_dsa (0x0)
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-with-mic,password
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /Users/krmahadevan/.ssh/id_rsa
debug3: no such identity: /Users/krmahadevan/.ssh/id_rsa
debug1: Trying private key: /Users/krmahadevan/.ssh/id_dsa
debug3: no such identity: /Users/krmahadevan/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
krmahadevan@stage2sc5403.sc4.com's password:
debug3: packet_send2: adding 48 (len 65 padlen 15 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Entering interactive session.
debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug2: channel 0: request shell confirm 1
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Last login: Wed Jan 18 22:03:35 2012 from 10.239.62.173

Red Hat Enterprise Linux Server release 5.4 (Tikanga)
[krmahadevan@stage2sc5403 ~]$

@hierynomus
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Could you get these same logs from your CI server?

@krmahadevan
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@jeroen,

Here are the logs from the CI server

[:1001]==>ssh -v -v -v coonradt@stage2sc5403.sc4.com
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
debug1: Reading configuration data /x/home/coonradt/.ssh/config
debug1: Applying options for *
debug1: /x/home/coonradt/.ssh/config line 6: Deprecated option "FallBackToRsh"
debug1: /x/home/coonradt/.ssh/config line 10: Deprecated option "RhostsAuthentication"
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to stage2sc5403.sc4.com [10.15.24.241] port 22.
debug1: Connection established.
debug1: identity file /x/home/coonradt/.ssh/identity type 0
debug3: Not a RSA1 key file /x/home/coonradt/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /x/home/coonradt/.ssh/id_rsa type 1
debug3: Not a RSA1 key file /x/home/coonradt/.ssh/id_dsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /x/home/coonradt/.ssh/id_dsa type 2
debug1: loaded 3 keys
debug1: Remote protocol version 1.99, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH*
debug1: Local version string SSH-1.5-OpenSSH_4.3
debug2: fd 3 setting O_NONBLOCK
debug1: Waiting for server public key.
debug1: Received server public key (768 bits) and host key (2048 bits).
debug3: check_host_in_hostfile: filename /x/home/coonradt/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 183
debug3: check_host_in_hostfile: filename /x/home/coonradt/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 183
debug1: Host 'stage2sc5403.sc4.com' is known and matches the RSA1 host key.
debug1: Found key in /x/home/coonradt/.ssh/known_hosts:183
debug1: Encryption type: 3des
debug1: Sent encrypted session key.
debug2: cipher_init: set keylen (16 -> 32)
debug2: cipher_init: set keylen (16 -> 32)
debug1: Installing crc compensation attack detector.
debug1: Received encrypted confirmation.
debug1: Trying RSA authentication with key '/x/home/coonradt/.ssh/identity'
debug1: Received RSA challenge from server.
debug1: Sending response to host key RSA challenge.
debug1: Remote: RSA authentication accepted.
debug1: RSA authentication accepted by server.
debug1: Requesting pty.
debug3: tty_make_modes: ospeed 9600
debug3: tty_make_modes: ispeed 9600
debug3: tty_make_modes: 1 3
debug3: tty_make_modes: 2 28
debug3: tty_make_modes: 3 127
debug3: tty_make_modes: 4 21
debug3: tty_make_modes: 5 4
debug3: tty_make_modes: 6 0
debug3: tty_make_modes: 7 0
debug3: tty_make_modes: 8 17
debug3: tty_make_modes: 9 19
debug3: tty_make_modes: 10 26
debug3: tty_make_modes: 12 18
debug3: tty_make_modes: 13 23
debug3: tty_make_modes: 14 22
debug3: tty_make_modes: 18 15
debug3: tty_make_modes: 30 0
debug3: tty_make_modes: 31 0
debug3: tty_make_modes: 32 0
debug3: tty_make_modes: 33 0
debug3: tty_make_modes: 34 0
debug3: tty_make_modes: 35 0
debug3: tty_make_modes: 36 1
debug3: tty_make_modes: 37 0
debug3: tty_make_modes: 38 1
debug3: tty_make_modes: 39 1
debug3: tty_make_modes: 40 0
debug3: tty_make_modes: 41 1
debug3: tty_make_modes: 50 1
debug3: tty_make_modes: 51 1
debug3: tty_make_modes: 52 0
debug3: tty_make_modes: 53 1
debug3: tty_make_modes: 54 1
debug3: tty_make_modes: 55 0
debug3: tty_make_modes: 56 0
debug3: tty_make_modes: 57 0
debug3: tty_make_modes: 58 0
debug3: tty_make_modes: 59 1
debug3: tty_make_modes: 60 1
debug3: tty_make_modes: 61 1
debug3: tty_make_modes: 62 1
debug3: tty_make_modes: 70 1
debug3: tty_make_modes: 71 0
debug3: tty_make_modes: 72 1
debug3: tty_make_modes: 73 0
debug3: tty_make_modes: 74 0
debug3: tty_make_modes: 75 0
debug3: tty_make_modes: 90 1
debug3: tty_make_modes: 91 1
debug3: tty_make_modes: 92 0
debug3: tty_make_modes: 93 0
debug2: fd 3 setting TCP_NODELAY
debug1: Requesting shell.
debug1: Entering interactive session.
debug2: fd 0 setting O_NONBLOCK
debug1: fd 0 clearing O_NONBLOCK
Last login: Mon Oct 24 16:59:19 2011 from 10.244.44.71
Red Hat Enterprise Linux Server release 5.4 (Tikanga)
-bash2-3.2$

@krmahadevan
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Jeroen,

Please let me know incase you require any further information from me on this.

@hierynomus
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Hi Krishan,

I know enough, somehow the SSH client on your CI machine is forcing SSHv1. However SSHv1 support is not yet built, and far as I know this is not supported in any of the open source SSH libraries. If you can find one, I'd be very grateful and will have an easier time building it in in SSHJ. For now I will continue on implementing SSHv1 support.

Regards,
Jeroen

@krmahadevan
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krmahadevan commented Jan 19, 2012 via email

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