OpenSSH, Chroot, and Public Key issue

From: David Coley (dcoley_at_davidcoley.com)
Date: 08/16/05

  • Next message: kasinadhuni raja rao: "sftp"
    To: <secureshell@securityfocus.com>
    Date: Mon, 15 Aug 2005 19:05:41 -0400
    
    

    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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