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Re^2: Help Required - Problem Automating SFTP

by Kraythorne (Sexton)
on Jan 28, 2009 at 12:42 UTC ( #739530=note: print w/ replies, xml ) Need Help??


in reply to Re: Help Required - Problem Automating SFTP
in thread Help Required - Problem Automating SFTP

I can connect using filezilla without any problems - it's just command line that is giving me the problems.

I don't know if the error I'm getting is from my sshd service or the clients' sftp server?

If it's the clients server then what do I need to ask them to do to accept shell commands? If it's my end then what can I do?

It seems that I can connect to the client and be verified using the key they supplied, but then loose connection when I try to communicate :-(


Comment on Re^2: Help Required - Problem Automating SFTP
Re^3: Help Required - Problem Automating SFTP
by salva (Monsignor) on Jan 28, 2009 at 13:03 UTC
    does command line scp work?

    Run a couple of tests using scp and sftp commands with the verbose flag (-v) and post here the output.

      VERBOSE OUTPUT FROM SFTP

      Connecting to *Host_IP*...
      debug1: Reading configuration data /etc/ssh_config
      debug2: ssh_connect: needpriv 0
      debug1: Connecting to *Host_IP* *Host_IP* port *Port*.
      debug1: Connection established.
      debug3: Not a RSA1 key file C:\\id_cmf_mediatech.
      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
      debug2: key_type_from_name: unknown key type '-----END'
      debug3: key_read: missing keytype
      debug1: identity file C:\\id_cmf_mediatech type -1
      debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1
      debug1: match: OpenSSH_5.1 pat OpenSSH*
      debug1: Enabling compatibility mode for protocol 2.0
      debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
      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,aes128-ctr,aes192-ctr,aes256-ctr
      debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,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
      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-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-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,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
      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_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(1024<1024<8192) sent
      debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
      debug2: dh_gen_key: priv key bits set: 122/256
      debug2: bits set: 517/1024
      debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
      debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
      debug3: check_host_in_hostfile: filename /home/.ssh/known_hosts
      debug3: check_host_in_hostfile: match line 1
      debug1: Host '*Host_IP*' is known and matches the RSA host key.
      debug1: Found key in /home/.ssh/known_hosts:1
      debug2: bits set: 520/1024
      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: C:\\id_cmf_mediatech (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: C:\\id_cmf_mediatech
      debug1: read PEM private key done: type RSA
      debug3: sign_and_send_pubkey
      debug2: we sent a publickey packet, wait for reply
      debug1: Authentication succeeded (publickey).
      debug2: fd 4 setting O_NONBLOCK
      debug2: fd 5 setting O_NONBLOCK
      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: ssh_session2_setup: id 0
      debug1: Sending subsystem: sftp-server
      debug2: channel 0: request subsystem
      debug2: callback done
      debug2: channel 0: open confirm rwindow 0 rmax 32768
      Request for subsystem 'sftp-server' failed on channel 0
      Connection closed


      If I don't put in the '-s sftp-server' switch the debug ends:


      debug1: Entering interactive session.
      debug2: callback start
      debug2: ssh_session2_setup: id 0
      debug1: Sending subsystem: sftp
      debug2: channel 0: request subsystem
      debug2: callback done
      debug2: channel 0: open confirm rwindow 0 rmax 32768
      Request for subsystem 'sftp' failed on channel 0
      Connection closed

      Any Thoughts?
        That means that SFTP has been forbidden in the remote host configuration.

        But as you have said that FileZilla works, maybe they are allowing scp, so just try it!

        scp generates:

        exec: cp: Not Found

        Is that cos I'm using windows - searching the web makes it look like these are unix commands that I don't have installed?
        Using Putty pscp:

        *Host_IP*:c:/test.txt
        Looking up host "*host_IP*"
        Connecting to *host_IP port *port*
        Server version: SSH-2.0-OpenSSH_5.1
        We claim version: SSH-2.0-PuTTY_Release_0.60
        Using SSH protocol version 2
        Doing Diffie-Hellman group exchange
        Doing Diffie-Hellman key exchange with hash SHA-256
        Host key fingerprint is:
        ssh-rsa 2048 *fingerprint*
        Initialised AES-256 SDCTR client->server encryption
        Initialised HMAC-SHA1 client->server MAC algorithm
        Initialised AES-256 SDCTR server->client encryption
        Initialised HMAC-SHA1 server->client MAC algorithm
        Reading private key file "c:/id_cmf_mediatech.ppk"
        Using username "*mycompany*".
        Offered public key
        Offer of public key accepted
        Authenticating with public key "rsa-key-20081029"
        Access granted
        Opened channel for session
        Primary command failed; attempting fallback
        Started a shell/command
        Using SCP1
        Connected to *host_IP*

        Ok, this looks like it can get me a connection - how can I use this with Net::SFTP::Foreign to automate file downloads and moving files on the clients FTP site?
        Ok, the saga continues...

        This is the information I have back from the client:

        'We restrict external logins to sftp connections only and chroot the users into their home directories, i.e. you don’t see “/home/mediatech” when you log in, you just see “/”. Now the problem arises when you are chrooted, in this case the command line sftp won’t connect, when you are not chrooted command line sftp works fine. Unfortunately this server is shared with other external customers so it is considered good practice to have all accounts chrooted.

        I can’t find anything about why this is the case or how to fix it but I have found that psftp (command line sftp that comes with Putty) works. As far as I can see psftp is a generic command line sftp client that does everything Openssh sftp does. I assume that it would integrate into Perl scripts exactly the same as sftp would.'

        So my question is - Can I get Net::SFTP::Foreign to work with Putty psftp? If not is there another module I could use?

        Thanks
Re^3: Help Required - Problem Automating SFTP
by nimdokk (Vicar) on Jan 28, 2009 at 13:48 UTC
    In looking at those messages, it appears you are getting a connection and getting authenticated with SSH, but the remote host is not starting the session shell properly. Confirm all the settings with the remote host admin and have them check to make sure their server is up an responding (and allowing logins to start correctly). It could also be a permissions issue on the remote host if you don't have the appropriate permisions to the login directory, you might not be able to get in to the site even though you can authenticate properly.

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