Server sFTP gagal memulai

10

Saya mengalami masalah dalam menjalankan sFTP sementara tidak ada masalah dengan ssh. Saya pada dasarnya membangun zlib, openssl, dan openssh untuk prosesor ARM menggunakan sistem file Linux yang sudah ada. Setelah mencari ide, ini sepertinya masalah umum, tapi saya belum membuat kemajuan. Saya hanya memiliki satu pengguna yang ditentukan, yang root dengan kata sandi kosong.

Saya menggunakan openssh versi 4.7p1, dan saya memodifikasi sshd_config dengan pengaturan berikut:

PermitRootLogin yes
PermitEmptyPasswords yes
UseDNS yes
UsePrivilegeSeparation no
SyslogFacility AUTH
LogLevel DEBUG3
Subsystem sftp /usr/local/libexec/sftp-server -f AUTH -l DEBUG3

Server sftp terletak di / usr / local / libexec dan memiliki izin berikut:

root@arm:/usr/local/libexec# ls -l
-rwxr-xr-x    1 root     root         65533 Oct  3 22:12 sftp-server
-rwx--x--x    1 root     root        233539 Oct  3 22:12 ssh-keysign

Saya tahu sftp-server sedang ditemukan (path diatur dalam sshd_config) karena jika saya mengganti nama sftp_server dapat dieksekusi, saya mendapatkan kesalahan berikut:

auth.err sshd[1698]: error: subsystem: cannot stat /usr/local/libexec/sftp-server: No such file or directory                                                        
auth.info sshd[1698]: subsystem request for sftp failed, subsystem not found   

Juga, init-skrip login target sangat sederhana dan terdiri dari satu file (etc / profile.d / local.sh), yang hanya berisi definisi untuk LD_LIBRARY_PATH, PATH dan PYTHONPATH seperti yang ditunjukkan di bawah ini:

#!/bin/sh
export LD_LIBRARY_PATH="/usr/local/lib"
export PATH="/usr/local/bin:/usr/local/libexec:${PATH}"
export PYTHONPATH="/home/root/python"

Seperti yang Anda lihat .bashrc, .profile, dll tidak ada di direktori home root:

root@arm:~# ls -la                                                                                                                                                                      
drwxr-xr-x    2 root     root          4096 Oct  4 14:57 .                                                                                                                                    
drwxr-xr-x    3 root     root          4096 Oct  4 01:11 ..                                                                                                                                   
-rw-------    1 root     root           120 Oct  4 01:21 .bash_history

Berikut ini adalah output log sistem ketika menggunakan FileZilla untuk terhubung ke server sftp pada target. Dari log nampaknya executable sftp-server ditemukan, tetapi proses anak segera keluar. Saya menggunakan argumen debug ketika memanggil sftp-server di sshd_config (Subsystem sftp / usr / local / libexec / sftp-server -f AUTH -l DEBUG3), tetapi tidak ada log yang ditangkap.

Oct  4 14:29:45 arm auth.info sshd[2070]: Connection from 192.168.1.12 port 45888                                                                                                       
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: Client protocol version 2.0; client software version PuTTY_Local:_Mar_28_2012_12:33:05                                               
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: no match: PuTTY_Local:_Mar_28_2012_12:33:05                                                                                          
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: Enabling compatibility mode for protocol 2.0                                                                                         
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: Local version string SSH-2.0-OpenSSH_4.7                                                                                             
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: fd 3 setting O_NONBLOCK                                                                                                              
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: list_hostkey_types: ssh-rsa,ssh-dss                                                                                                  
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: SSH2_MSG_KEXINIT sent                                                                                                                
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: SSH2_MSG_KEXINIT received                                                                                                            
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellma1
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: ssh-rsa,ssh-dss                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysr
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysr
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96         
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96         
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: none,[email protected]                                                                                             
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: none,[email protected]                                                                                             
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit:                                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit:                                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: first_kex_follows 0                                                                                               
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: reserved 0                                                                                                        
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellma1
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: ssh-rsa,ssh-dss                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: aes256-ctr,aes256-cbc,[email protected],aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,blowfish-ctr,blowfi8
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: aes256-ctr,aes256-cbc,[email protected],aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,blowfish-ctr,blowfi8
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: hmac-sha1,hmac-sha1-96,hmac-md5                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: hmac-sha1,hmac-sha1-96,hmac-md5                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: none,zlib                                                                                                         
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: none,zlib                                                                                                         
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit:                                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit:                                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: first_kex_follows 0                                                                                               
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_parse_kexinit: reserved 0                                                                                                        
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: mac_setup: found hmac-sha1                                                                                                           
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: kex: client->server aes256-ctr hmac-sha1 none                                                                                        
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: mac_setup: found hmac-sha1                                                                                                           
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: kex: server->client aes256-ctr hmac-sha1 none                                                                                        
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: SSH2_MSG_KEX_DH_GEX_REQUEST_OLD received                                                                                             
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent                                                                                                       
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: dh_gen_key: priv key bits set: 277/512                                                                                               
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: bits set: 2052/4096                                                                                                                  
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: bits set: 2036/4096                                                                                                                  
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent                                                                                                       
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: kex_derive_keys                                                                                                                      
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: set_newkeys: mode 1                                                                                                                  
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug2: cipher_init: set keylen (16 -> 32)                                                                                                   
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: SSH2_MSG_NEWKEYS sent                                                                                                                
Oct  4 14:29:45 arm auth.debug sshd[2070]: debug1: expecting SSH2_MSG_NEWKEYS                                                                                                           
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: set_newkeys: mode 0                                                                                                                  
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: cipher_init: set keylen (16 -> 32)                                                                                                   
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: SSH2_MSG_NEWKEYS received                                                                                                            
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: KEX done                                                                                                                             
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: userauth-request for user root service ssh-connection method none                                                                    
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: attempt 0 failures 0                                                                                                                 
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug3: Trying to reverse map address 192.168.1.12.                                                                                          
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: parse_server_config: config reprocess config len 302                                                                                 
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: input_userauth_request: setting up authctxt for root                                                                                 
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: input_userauth_request: try method none                                                                                              
Oct  4 14:29:46 arm auth.info sshd[2070]: Accepted none for root from 192.168.1.12 port 45888 ssh2                                                                                      
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: Entering interactive session for SSH2.                                                                                               
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: fd 4 setting O_NONBLOCK                                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: fd 5 setting O_NONBLOCK                                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: server_init_dispatch_20                                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: server_input_channel_open: ctype session rchan 256 win 2147483647 max 16384                                                          
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: input_session_request                                                                                                                
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: channel 0: new [server-session]                                                                                                      
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_new: init                                                                                                                    
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_new: session 0                                                                                                               
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_open: channel 0                                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_open: session 0: link with channel 0                                                                                         
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: server_input_channel_open: confirm session                                                                                           
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: server_input_channel_req: channel 0 request [email protected] reply 0                                               
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_by_channel: session 0 channel 0                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_input_channel_req: session 0 req [email protected]                                                          
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: server_input_channel_req: channel 0 request subsystem reply 1                                                                        
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_by_channel: session 0 channel 0                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_input_channel_req: session 0 req subsystem                                                                                   
Oct  4 14:29:46 arm auth.info sshd[2070]: subsystem request for sftp                                                                                                                    
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: subsystem: exec() /usr/local/libexec/sftp-server -f AUTH -l DEBUG3                                                                   
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: fd 3 setting TCP_NODELAY                                                                                                             
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: fd 7 setting O_NONBLOCK                                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug3: fd 7 is O_NONBLOCK                                                                                                                   
Oct  4 14:29:46 arm auth.debug sshd[2073]: debug1: permanently_set_uid: 0/0                                                                                                             
Oct  4 14:29:46 arm auth.debug sshd[2073]: debug3: channel 0: close_fds r -1 w -1 e -1 c -1                                                                                             
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: read<=0 rfd 7 len -1                                                                                                      
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: read failed                                                                                                               
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: close_read                                                                                                                
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: input open -> drain                                                                                                       
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: ibuf empty                                                                                                                
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: send eof                                                                                                                  
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: input drain -> closed                                                                                                     
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: notify_done: reading                                                                                                                 
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: Received SIGCHLD.                                                                                                                    
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_by_pid: pid 2073                                                                                                             
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_exit_message: session 0 channel 0 pid 2073                                                                                   
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: request exit-status confirm 0                                                                                             
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_exit_message: release channel 0                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: write failed                                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: close_write                                                                                                               
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: output open -> closed                                                                                                     
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: send close                                                                                                                
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug3: channel 0: will not send data after close                                                                                            
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: rcvd close                                                                                                                
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug3: channel 0: will not send data after close                                                                                            
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: is dead                                                                                                                   
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: gc: notify user                                                                                                           
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_by_channel: session 0 channel 0                                                                                              
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_close_by_channel: channel 0 child 0                                                                                          
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: session_close: session 0 pid 0                                                                                                       
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: gc: user detached                                                                                                         
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: is dead                                                                                                                   
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug2: channel 0: garbage collecting                                                                                                        
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: channel 0: free: server-session, nchannels 1                                                                                         
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug3: channel 0: status: The following connections are open:\r\n  #0 server-session (t4 r256 i3/0 o3/0 fd 7/7 cfd -1)\r\n                  
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug3: channel 0: close_fds r 7 w 7 e -1 c -1                                                                                               
Oct  4 14:29:46 arm auth.info sshd[2070]: Connection closed by 192.168.1.12                                                                                                             
Oct  4 14:29:46 arm auth.debug sshd[2070]: debug1: do_cleanup                                                                                                                           
Oct  4 14:29:46 arm auth.info sshd[2070]: Closing connection to 192.168.1.12 
Michael
sumber
Saya akan mengesampingkan FileZilla sebagai masalah. Coba dengan sftpperintah ( sftp host.name.here). Jika sesuatu gagal, itu mungkin juga memberi Anda info lebih baik.
Patrick
sedikit tidak berhubungan: OpenSSH 4.7p1 berusia 6 tahun - demi keamanan silakan gunakan sesuatu yang lebih baru. Adapun pertanyaan: Anda sftp-servertampaknya keluar sebelum waktunya:Oct 4 14:29:46 arm auth.debug sshd[2070]: debug1: Received SIGCHLD.
peterph
@ Peterph - Saya memperbarui ke openssh terbaru (6.3p1) kemarin dan mengalami masalah yang sama.
Michael
@ Patrick - Saya sudah mencoba perintah sftp dari host-to-target dan hasilnya sama. Server menutup koneksi setelah otentikasi.
Michael
@Michael, bisakah Anda menjalankan sshd strace -f?
peterph

Jawaban:

9

Meskipun ini lebih merupakan solusi alternatif daripada jawaban langsung untuk masalah Anda, saya akan mencoba menggunakan server sftp internal daripada yang eksternal. Karena ini adalah sistem tertanam, ini mungkin lebih masuk akal untuk dilakukan.

Di Anda sshd_config, cukup tambahkan:

Subsystem sftp internal-sftp

Dengan begitu Anda bisa meninggalkan biner sftp dan menghemat ruang.

Patrick
sumber
Tampaknya tidak berfungsi "kesalahan: subsistem: tidak dapat stat internal-sftp: Tidak ada file atau direktori." Tidak yakin mengapa ini terjadi, tetapi sepertinya itu bukan opsi kompilasi / konfigurasi ...
Michael
@Michael hrm, itu aneh. Mungkin ini adalah opsi waktu kompilasi. Tidak pernah melihat OpenSSH tanpanya.
Patrick
Saya memperbarui ke openssh terbaru (6.3p1) dan internal-sftp berfungsi seperti yang diharapkan.
Michael
Alasan yang mungkin untuk sftp-server gagal untuk memulai adalah ketika pengguna tidak memiliki shell, misalnya jika diset ke / bin / false. Dalam hal ini Anda harus menggunakan "internal-sftp".
Zrin