trouble with chroot and sftp

[John R. <joh...@hm...>]

Hello,

I am trying to get chroot to work with rssh for sftp. sftp works fine for
users who use rssh as their shell, but only when chroot is not involved. If
I uncomment chrootpath and set it to what should be a valid chroot path,
sftp logins will terminate immediately after I enter the SFTP password.

If you know how to solve the above problem, great, but I'm more interested
in getting some useful logs that will help me troubleshoot this problem.
The only log entry that goes to the syslog is this one, which doesn't seem
very interesting:

rssh[22313]: chroot cmd line: /usr/lib/rssh/rssh_chroot_helper 2
"/usr/lib/openssh/sftp-server"

My question is, how do I get rssh to produce a useful error here?

Thanks.!

And here's some additional logging that I have, although I don't personally
see much there.

rssh -v

rssh 2.3.4

And here's some additional logging that I have, although I don't personally
see much value in either.

auth.log shows that the password was accepted, but that's about it.

Jul 17 14:23:41 myserver sshd[22611]: Accepted password for TEST_SFTP from
10.100.11.3 port 53593 ssh2
Jul 17 14:23:41 myserver sshd[22611]: pam_unix(sshd:session): session
opened for user TEST_SFTP by (uid=0)
Jul 17 14:23:42 myserver sshd[22755]: subsystem request for sftp by user
TEST_SFTP
Jul 17 14:23:42 myserver sshd[22755]: Received disconnect from 10.100.11.3:
11: disconnected by user
Jul 17 14:23:42 myserver sshd[22611]: pam_unix(sshd:session): session
closed for user TEST_SFTP


And here is the output of sftp -v myserver, on the client side.


sftp -v TEST_SFTP@ironman
OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to ironman [10.100.10.116] port 22.
debug1: Connection established.
debug1: identity file /home/jwr/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/jwr/.ssh/id_rsa-cert type -1
debug1: identity file /home/jwr/.ssh/id_dsa type -1
debug1: identity file /home/jwr/.ssh/id_dsa-cert type -1
debug1: identity file /home/jwr/.ssh/id_ecdsa type -1
debug1: identity file /home/jwr/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1
Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.1
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: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA
73:4d:12:ab:20:0a:59:0d:e7:6a:1d:41:71:50:eb:7c
debug1: Host 'ironman' is known and matches the ECDSA host key.
debug1: Found key in /home/jwr/.ssh/known_hosts:88
debug1: ssh_ecdsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/jwr/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/jwr/.ssh/id_dsa
debug1: Trying private key: /home/jwr/.ssh/id_ecdsa
debug1: Next authentication method: password
TEST_SFTP@ironman's password:
debug1: Authentication succeeded (password).
Authenticated to ironman ([10.100.10.116]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-...@op...
debug1: Entering interactive session.
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
debug1: Sending subsystem: sftp
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eo...@op... reply 0
debug1: channel 0: free: client-session, nchannels 1
debug1: fd 0 clearing O_NONBLOCK
Transferred: sent 2232, received 1648 bytes, in 0.4 seconds
Bytes per second: sent 6158.0, received 4546.7
debug1: Exit status 1
Connection closed