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Subject: Re: libssh2 for SFTP

Re: libssh2 for SFTP

From: Steven Van Ingelgem <steven_at_vaningelgem.be>
Date: Mon, 24 Aug 2009 08:08:37 +0200

It seems on Linux #1 you use the openssh sftp version and not the libssh2
sftp example.

If I were you, I would try "which sftp" to determine what version you are
using.

2009/8/24 Shangguan, Xuan (FXSGSC) <Xuan.Shangguan_at_fujixerox.com>

> Hi all,
>
> I would like to use libssh2 to write a SFTP client. I compiled the
> "libssh2-1.2" under two Linux environment. Both build looked ok. I then
> build example "sftp" to test.
>
> [Question 1]: Different default results when run "sftp". Why? Note, I added
> some "-debug-" printf messages in Linux #2.
>
> Linux #1> sftp
> ---------------------
> usage: sftp [-1Cv] [-B buffer_size] [-b batchfile] [-F ssh_config]
> [-o ssh_option] [-P sftp_server_path] [-R num_requests]
> [-S program] [-s subsystem | sftp_server] host
> sftp [[user@]host[:file [file]]]
> sftp [[user@]host[:dir[/]]]
> sftp -b batchfile [user@]host
>
> Linux #2> sftp
> ----------------------
> -debug- argc = 1
> -debug- argv[0] = sftp
> -debug- username = username, password = password, sftppath = /tmp/TEST
> Fingerprint: 17 7E 8D C6 46 75 DE B4 30 8E 12 67 CB CC 8B F7
> Authentication methods: publickey,password,keyboard-interactive
> Authentication by password failed.
> all done
> [Question 2]: Different usage support and different results. Why? And why
> both failed?
>
> Linux #1> sftp -v sxuan_at_xx.xx.xx.xx
> ------------------------------------------------------
> Connecting to xx.xx.xx.xx...
> OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: Applying options for *
> debug1: Connecting to xx.xx.xx.xx [xx.xx.xx.xx] port 22.
> debug1: Connection established.
> debug1: identity file /home/sxuan/.ssh/id_rsa type -1
> debug1: identity file /home/sxuan/.ssh/id_dsa type -1
> debug1: loaded 2 keys
> debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
> debug1: match: OpenSSH_4.3 pat OpenSSH*
> debug1: Enabling compatibility mode for protocol 2.0
> debug1: Local version string SSH-2.0-OpenSSH_4.3
> debug1: SSH2_MSG_KEXINIT sent
> debug1: SSH2_MSG_KEXINIT received
> debug1: kex: server->client aes128-cbc hmac-md5 none
> 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
> debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
> debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
> debug1: Host 'xx.xx.xx.xx' is known and matches the RSA host key.
> debug1: Found key in /home/sxuan/.ssh/known_hosts:1
> debug1: ssh_rsa_verify: signature correct
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting SSH2_MSG_NEWKEYS
> debug1: SSH2_MSG_NEWKEYS received
> debug1: SSH2_MSG_SERVICE_REQUEST sent
> debug1: SSH2_MSG_SERVICE_ACCEPT received
> debug1: Authentications that can continue:
> publickey,gssapi-with-mic,password
> debug1: Next authentication method: gssapi-with-mic
> Address xx.xx.xx.xx maps to durian, but this does not map back to the
> address - POSSIBLE BREAK-IN ATTEMPT!
> debug1: Unspecified GSS failure. Minor code may provide more information
> No credentials cache found
> debug1: Next authentication method: publickey
> debug1: Trying private key: /home/sxuan/.ssh/id_rsa
> debug1: Trying private key: /home/sxuan/.ssh/id_dsa
> debug1: Next authentication method: password
> sxuan_at_xx.xx.xx.xx's <sxuan_at_xx.xx.xx.xx%27s> password:
> debug1: Authentication succeeded (password).
> debug1: channel 0: new [client-session]
> debug1: Entering interactive session.
> debug1: Sending environment.
> debug1: Sending env LANG = en_US.iso885915
> debug1: Sending subsystem: sftp
> Received message too long 1399157876
> -----------------------------------------------------
>
> Linux #2> sftp xx.xx.xx.xx sxuan ******* /home/sxuan/
> ------------------------------------------------------
> -debug- argc = 5
> -debug- argv[0] = sftp
> -debug- argv[1] = xx.xx.xx.xx
> -debug- argv[2] = sxuan
> -debug- argv[3] = *******
> -debug- argv[4] = /home/sxuan/
> -debug- username = sxuan, password = *******, sftppath = /home/sxuan/
> Fingerprint: 0B F2 D3 94 9D 0F 75 BE 69 15 33 42 B8 0D 88 CA
> Authentication methods: publickey,gssapi-with-mic,password
> libssh2_sftp_init()!
> Unable to init SFTP session
> all done
>
> [Question 3]: How to use "libssh2_trace()" to debug?
>
> Best regards,
> Xuan
>
>
>
>
>
> _______________________________________________
> libssh2-devel http://cool.haxx.se/cgi-bin/mailman/listinfo/libssh2-devel
>
>

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Received on 2009-08-24

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