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sftp session disconnects right after passwd enter [solved]
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DaggyStyle
Watchman
Watchman


Joined: 22 Mar 2006
Posts: 5273

PostPosted: Wed May 21, 2014 8:28 pm    Post subject: sftp session disconnects right after passwd enter [solved] Reply with quote

Greetings All,

I have a ssh server which allows sftp connections from the Internet while ssh connections from within the local net, here is the config:
Code:
Port 11111
Port 11113
Protocol 2
LogLevel DEBUG
PasswordAuthentication no
UsePAM yes
PrintMotd no
PrintLastLog no
Subsystem       sftp    /usr/lib64/misc/sftp-server
Match LocalPort 11113 Address *,!192.168.0.0/24
   ChrootDirectory /home/%u
   AllowTCPForwarding no
   X11Forwarding no
   AllowUsers sftp_user
   ForceCommand /usr/lib/openssh/sftp-server
   AuthenticationMethods publickey,password publickey,keyboard-interactive
   RSAAuthentication yes
   PubkeyAuthentication yes
AcceptEnv LANG LC_*


now when I try to connect I from outside the net to test it I see this in the client:
Code:
dagg@NCC-5001-D ~/.ssh/sftp_keys $ sftp -oPort=11113 -oIdentityFile=id_rsa sftp_user@111.111.111.111
Authenticated with partial success.
Password:
Connection closed

I'm sure the passwd is correct because su - sftp_user with that same passwd works and if I enter a worng passwd I'm prompted with another "Password: " line.

the server logs are:
Code:
May 21 22:56:30 NCC-5001-D sshd[30467]: debug1: Forked child 30708.
May 21 22:56:30 NCC-5001-D sshd[30708]: Set /proc/self/oom_score_adj to 0
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: rexec start in 7 out 7 newsock 7 pipe 9 sock 10
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: inetd sockets after dupping: 3, 3
May 21 22:56:30 NCC-5001-D sshd[30708]: Connection from 111.111.111.111 port 41017 on 192.168.0.1 port 11113
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: HPN Disabled: 0, HPN Buffer Size: 87380
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Client protocol version 2.0; client software version OpenSSH_6.6p1-hpn14v4
May 21 22:56:30 NCC-5001-D sshd[30708]: SSH: Server;Ltype: Version;Remote: 111.111.111.111-41017;Protocol: 2.0;Client: OpenSSH_6.6p1-hpn14v4
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: match: OpenSSH_6.6p1-hpn14v4 pat OpenSSH* compat 0x04000000
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Enabling compatibility mode for protocol 2.0
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Local version string SSH-2.0-OpenSSH_6.6p1-hpn14v4
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: permanently_set_uid: 22/22 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: SSH2_MSG_KEXINIT sent [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: SSH2_MSG_KEXINIT received [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: AUTH STATE IS 0 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: REQUESTED ENC.NAME is 'aes128-ctr' [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: SSH: Server;Ltype: Kex;Remote: 111.111.111.111-41017;Enc: aes128-ctr;MAC: hmac-md5-etm@openssh.com;Comp: none [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: REQUESTED ENC.NAME is 'aes128-ctr' [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: SSH2_MSG_NEWKEYS sent [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: expecting SSH2_MSG_NEWKEYS [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: SSH2_MSG_NEWKEYS received [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: KEX done [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: userauth-request for user sftp_user service ssh-connection method none [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: SSH: Server;Ltype: Authname;Remote: 111.111.111.111-41017;Name: sftp_user [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: attempt 0 failures 0 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is port
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is port
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is protocol
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is loglevel
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is passwordauthentication
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is usepam
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is printmotd
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is printlastlog
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is useprivilegeseparation
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is subsystem
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is match
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: connection from 192.168.0.1 matched 'LocalPort 11113' at line 176
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: connection from 111.111.111.111 matched 'Address *,!192.168.0.0/24' at line 176
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is chrootdirectory
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is allowtcpforwarding
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is x11forwarding
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is allowusers
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is forcecommand
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is authenticationmethods
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is rsaauthentication
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is pubkeyauthentication
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: Config token is acceptenv
May 21 22:56:30 NCC-5001-D sshd[30708]: error: Disabled method "password" in AuthenticationMethods list "publickey,password"
May 21 22:56:30 NCC-5001-D sshd[30708]: Authentication methods list "publickey,password" contains disabled method, skipping
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: authentication methods list 0: publickey,keyboard-interactive
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: PAM: initializing for "sftp_user"
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: PAM: setting PAM_RHOST to "red.unlimited.net"
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: PAM: setting PAM_TTY to "ssh"
May 21 22:56:30 NCC-5001-D sshd[30708]: error: Disabled method "password" in AuthenticationMethods list "publickey,password" [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: Authentication methods list "publickey,password" contains disabled method, skipping [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: authentication methods list 0: publickey,keyboard-interactive [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: userauth-request for user sftp_user service ssh-connection method publickey [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: attempt 1 failures 0 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: test whether pkalg/pkblob are acceptable [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: temporarily_use_uid: 1004/100 (e=0/0)
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: trying public key file /home/sftp_user/.ssh/authorized_keys
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: fd 4 clearing O_NONBLOCK
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: matching key found: file /home/sftp_user/.ssh/authorized_keys, line 1 RSA xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: restore_uid: 0/0
May 21 22:56:30 NCC-5001-D sshd[30708]: Postponed publickey for sftp_user from 111.111.111.111 port 41017 ssh2 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: userauth-request for user sftp_user service ssh-connection method publickey [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: attempt 2 failures 0 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: temporarily_use_uid: 1004/100 (e=0/0)
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: trying public key file /home/sftp_user/.ssh/authorized_keys
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: fd 4 clearing O_NONBLOCK
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: matching key found: file /home/sftp_user/.ssh/authorized_keys, line 1 RSA xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: restore_uid: 0/0
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: ssh_rsa_verify: signature correct
May 21 22:56:30 NCC-5001-D sshd[30708]: Partial publickey for sftp_user from 111.111.111.111 port 41017 ssh2: RSA xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: userauth-request for user sftp_user service ssh-connection method keyboard-interactive [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: attempt 3 failures 1 [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: keyboard-interactive devs  [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: auth2_challenge: user=sftp_user devs= [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: kbdint_alloc: devices 'pam' [preauth]
May 21 22:56:30 NCC-5001-D sshd[30708]: debug1: auth2_challenge_start: trying authentication method 'pam' [preauth]
May 21 22:56:31 NCC-5001-D sshd[30708]: Postponed keyboard-interactive for sftp_user from 111.111.111.111 port 41017 ssh2: RSA xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx [preauth]
May 21 22:56:34 NCC-5001-D sshd[30713]: debug1: do_pam_account: called
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: PAM: num PAM env strings 0
May 21 22:56:34 NCC-5001-D sshd[30708]: Postponed keyboard-interactive/pam for sftp_user from 111.111.111.111 port 41017 ssh2 [preauth]
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: do_pam_account: called
May 21 22:56:34 NCC-5001-D sshd[30708]: Accepted keyboard-interactive/pam for sftp_user from 111.111.111.111 port 41017 ssh2
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: monitor_child_preauth: sftp_user has been authenticated by privileged process
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: monitor_read_log: child log fd closed
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: PAM: establishing credentials
May 21 22:56:34 NCC-5001-D sshd[30708]: pam_unix(sshd:session): session opened for user sftp_user by (uid=0)
May 21 22:56:34 NCC-5001-D sshd[30708]: User child is on pid 30721
May 21 22:56:34 NCC-5001-D sshd[30721]: debug1: PAM: establishing credentials
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: do_cleanup
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: PAM: cleanup
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: PAM: closing session
May 21 22:56:34 NCC-5001-D sshd[30708]: pam_unix(sshd:session): session closed for user sftp_user
May 21 22:56:34 NCC-5001-D sshd[30708]: debug1: PAM: deleting credentials


why I'm not able to get a ftp cli?

Thanks.
_________________
Only two things are infinite, the universe and human stupidity and I'm not sure about the former - Albert Einstein


Last edited by DaggyStyle on Mon Jun 02, 2014 5:29 am; edited 1 time in total
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windex
n00b
n00b


Joined: 09 Dec 2012
Posts: 70

PostPosted: Sat May 31, 2014 12:51 am    Post subject: Reply with quote

Can you confirm that you're able to connect from localhost, and then from inside of your network?
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DaggyStyle
Watchman
Watchman


Joined: 22 Mar 2006
Posts: 5273

PostPosted: Sun Jun 01, 2014 7:05 pm    Post subject: Reply with quote

windex wrote:
Can you confirm that you're able to connect from localhost, and then from inside of your network?


good idea, will check
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DaggyStyle
Watchman
Watchman


Joined: 22 Mar 2006
Posts: 5273

PostPosted: Sun Jun 01, 2014 7:09 pm    Post subject: Reply with quote

removing the internet limitation didn't worked.
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DaggyStyle
Watchman
Watchman


Joined: 22 Mar 2006
Posts: 5273

PostPosted: Sun Jun 01, 2014 7:48 pm    Post subject: Reply with quote

ok, got some lead, this happens only of I set the ChrootDirectory directive
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windex
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n00b


Joined: 09 Dec 2012
Posts: 70

PostPosted: Mon Jun 02, 2014 2:02 am    Post subject: chrooting sshd Reply with quote

Can you please post the ChrootDirectory component of your sshd_config. If it's deemed sensitive, please
PM it to me instead. What specifically are you attempting to accomplish by chrooting? Can you please
confirm that you can chroot successfully into that folder?
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DaggyStyle
Watchman
Watchman


Joined: 22 Mar 2006
Posts: 5273

PostPosted: Mon Jun 02, 2014 5:29 am    Post subject: solved! Reply with quote

it seems that chrootdir behaves well only when paired with internal sftp instead of external binary.
here is the working config:
Code:
Port 11111
Port 11113
Protocol 2
LogLevel DEBUG
PasswordAuthentication no
UsePAM yes
PrintMotd no
PrintLastLog no
Subsystem       sftp    internal-sftp
Match LocalPort 11113 Address *,!192.168.0.0/24
   ChrootDirectory /home/%u
   AllowTCPForwarding no
   X11Forwarding no
   AllowUsers sftp_user
   ForceCommand internal-sftp
   AuthenticationMethods publickey,password publickey,keyboard-interactive
   RSAAuthentication yes
   PubkeyAuthentication yes
AcceptEnv LANG LC_*


I wonder why but it works and that is what I need it to do.
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