Network Security: Detailed info on Re: OpenSSH, Chroot, and Public Key issue

Subject:	Re: OpenSSH, Chroot, and Public Key issue
Date:	Tue, 16 Aug 2005 09:37:33 -0700 (PDT)

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I tried chrooting openssh, and found scponly (which also does sftp) to be a far simpler solution. It's a replacement shell for the user that does a chroot when the user logs in via ssh and only allows them to scp/sftp. I have it working with public key authentication as well.

http://www.sublimation.org/scponly/

It also has the nice feature of logging the requests the user makes to syslog.


On Mon, 15 Aug 2005, David Coley wrote:

Hello all,

I recently built a chroot jail from scratch.  I'm not using the /./ patch
but built a custom one based on the http://intmainvoid.nl/?chroot+shell
instructions.

Now everything is working for the chroot and the secure shell, except for
public key authentication.

Users who are not in the chroot can use public keys, those who are can't.

I would appreciate any help at all.  I've been working on this for days and
can not figure out what's wrong:

Chroot users are in the following directory:
/home/sftp/[username]/home/[username]/

I use the:
#!/bin/bash

# chrootshell spawns chroot shell
#
# (c) 2003-2005 Anne Jan Brouwer
#            GNU GPL

if [ "$1" = "-c" ]
then
      i=0
      PARAMETERS=""
      for parameter in $*
      do
              if [ $i -gt 0 ]
              then
                      PARAMETERS="$PARAMETERS $parameter"
              fi
              let i++
      done
      sudo /usr/sbin/chroot /home/$USER /bin/su - $USER -c "$PARAMETERS"
else
      sudo /usr/sbin/chroot /home/$USER /bin/su - $USER
fi

as my Chroot shell Script.

Below is my debug info from openssh.  Any help would be greatly appreciated:

OpenSSH_3.5p1, SSH protocols 1.5/2.0, OpenSSL 0x0090701f
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Rhosts Authentication disabled, originating port will not be
trusted.
debug1: ssh_connect: needpriv 0
debug1: Connecting to mydomain.com [204.92.116.50] port 22.
debug1: Connection established.
debug1: identity file /home/coley/.ssh/identity type -1
debug3: Not a RSA1 key file /home/coley/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug2: key_type_from_name: unknown key type 'Proc-Type:'
debug3: key_read: no key found
debug2: key_type_from_name: unknown key type 'DEK-Info:'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/coley/.ssh/id_rsa type 1
debug1: identity file /home/coley/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version
OpenSSH_3.6.1p2
debug1: match: OpenSSH_3.6.1p2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.5p1
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,r
ijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,r
ijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hm
ac-md5-96
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hm
ac-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,r
ijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,r
ijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hm
ac-md5-96
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hm
ac-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
debug1: dh_gen_key: priv key bits set: 118/256
debug1: bits set: 1559/3191
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/coley/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 4
debug3: check_host_in_hostfile: filename /home/coley/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 3
debug1: Host 'mydomain.com' is known and matches the RSA host key.
debug1: Found key in /home/coley/.ssh/known_hosts:4
debug1: bits set: 1611/3191
debug1: ssh_rsa_verify: signature correct
debug1: kex_derive_keys
debug1: newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: waiting for SSH2_MSG_NEWKEYS
debug1: newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: done: ssh_kex2.
debug1: send SSH2_MSG_SERVICE_REQUEST
debug1: service_accept: ssh-userauth
debug1: got SSH2_MSG_SERVICE_ACCEPT
debug1: authentications that can continue:
publickey,password,keyboard-interactive
debug3: start over, passed a different list
publickey,password,keyboard-interactive
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: next auth method to try is publickey
debug1: try privkey: /home/coley/.ssh/identity
debug3: no such identity: /home/coley/.ssh/identity
debug1: try pubkey: /home/coley/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: authentications that can continue:
publickey,password,keyboard-interactive
debug1: try privkey: /home/coley/.ssh/id_dsa
debug3: no such identity: /home/coley/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: next auth method to try is keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug1: authentications that can continue:
publickey,password,keyboard-interactive
debug3: userauth_kbdint: disable: no info_req_seen
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred:
debug3: authmethod_is_enabled password
debug1: next auth method to try is password

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