Difference between revisions of "Sftp chroot configuration"

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[[OpenSSH 4.9]]+ (2008) includes a built-in chroot for SFTP.
 +
  
 
== Configuration ==
 
== Configuration ==
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     [[ChrootDirectory]] [[%h]]
 
     [[ChrootDirectory]] [[%h]]
 
     ForceCommand [[internal-sftp]]
 
     ForceCommand [[internal-sftp]]
     AllowTCPForwarding no
+
     [[AllowTCPForwarding]] no
 
     X11Forwarding no
 
     X11Forwarding no
  
Line 40: Line 42:
 
=== 3) Review privileges from <code>[[ChrootDirectory]]</code>  directory ===
 
=== 3) Review privileges from <code>[[ChrootDirectory]]</code>  directory ===
  
== 4) [[Creating a new user]] ==
+
=== 4) [[Create a new user account]] ===
 
  [[useradd --create-home]] USERNAME
 
  [[useradd --create-home]] USERNAME
  su - USERNAME
+
  [[su]] - USERNAME
 
  [[mkdir -p]] ~/[[.ssh]]
 
  [[mkdir -p]] ~/[[.ssh]]
  [[chown]]
+
  [[chmod]] og-rxw [[~]]/.ssh
[[chmod]] og-rx /home/USERNAME/.ssh
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  [[touch]] ~/.ssh/[[authorized_keys]] && [[chmod]] og-rw ~/.ssh/authorized_keys
  [[touch]] ~/.ssh/authorized_keys && chmod og-r ~/.ssh/authorized_keys
+
[[passwd]] USERNAME
  
 
  [[mkdir -p]] /path/to/directory/upload
 
  [[mkdir -p]] /path/to/directory/upload
 
  chmod 777 /path/to/directory/upload
 
  chmod 777 /path/to/directory/upload
  
  Add user on [[Match]] section on [[sshd_config]] file
+
  Add user on [[Match]] section on [[/etc/ssh/sshd_config]] file
  
 
  [[sshd -t]]
 
  [[sshd -t]]
  [[systemctl restart]] sshd
+
  [[systemctl restart sshd]] && [[systemctl status sshd]]
  
 
== Logs ==
 
== Logs ==
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  'Match LocalPort' in configuration but 'lport' not in connection test specification.
 
  'Match LocalPort' in configuration but 'lport' not in connection test specification.
  
 +
See also: <code>[[LogLevel]]</code>
  
== Related commands ==
+
== Related terms ==
 
* <code>[[useradd]] -m USERNAME</code>
 
* <code>[[useradd]] -m USERNAME</code>
 +
* https://wiki.archlinux.org/index.php/SFTP_chroot
  
 
== See also ==
 
== See also ==

Latest revision as of 04:41, 27 August 2021

OpenSSH 4.9+ (2008) includes a built-in chroot for SFTP.


Configuration[edit]



1) Modify Subsystem to internal-sftp[edit]

Modify /etc/ssh/sshd_config file
#Subsystem sftp /usr/lib/openssh/sftp-server
Subsystem sftp internal-sftp


2) Create a user section at the end of the file (ssh can die respawning if placed after Subsystem line)[edit]

Match User john
   ChrootDirectory %h
   ForceCommand internal-sftp
   AllowTCPForwarding no
   X11Forwarding no

Others:

  • %u (User)
  • %h (home directory)


Multiple users:

 Match User USER1,USER2


With double Match rule

Match User john LocalPort 2222 
   ChrootDirectory %h
   ForceCommand internal-sftp
   AllowTCPForwarding no
   X11Forwarding no

3) Review privileges from ChrootDirectory directory[edit]

4) Create a new user account[edit]

useradd --create-home USERNAME
su - USERNAME
mkdir -p ~/.ssh
chmod og-rxw ~/.ssh
touch ~/.ssh/authorized_keys && chmod og-rw ~/.ssh/authorized_keys
passwd USERNAME
mkdir -p /path/to/directory/upload
chmod 777 /path/to/directory/upload
Add user on Match section on /etc/ssh/sshd_config file
sshd -t
systemctl restart sshd && systemctl status sshd

Logs[edit]

scp error

 protocol error: mtime.sec not present

sshd -T

'Match LocalPort' in configuration but 'lport' not in connection test specification.

See also: LogLevel

Related terms[edit]

See also[edit]

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