fs_setcrypt - Enables of disables the encryption of AFS file transfers
The fs setcrypt
command sets the status of network traffic encryption for
file traffic in the AFS client. This encryption applies to file traffic going
to and coming from the AFS File Server for users with valid tokens. This
command does not control the encryption used for authentication, which uses
Kerberos 5 or klog/kaserver. The complement of this command is fs
, which shows the status of encryption on the client.
The default encryption status is enabled on Windows. It is disabled on all
non-Windows clients by default. You may enable encryption by default on
non-Windows platforms by executing fs setcrypt -crypt on
after the client daemon starts. For example, on Linux, you can do this within
the SysV init script, or with systemd's ExecStartPost parameter.
This is a global setting and applies to all subsequent connections to an AFS
File Server from this Cache Manager. There is no way to enable or disable
encryption for specific connections.
AFS uses an encryption scheme called fcrypt, based on but slightly weaker than
DES, and there is currently no way to specify a different encryption
mechanism. Because fcrypt and DES are obsolete, the user must decide how much
to trust the encryption. Consider using a Virtual Private Network at the IP
level if better encryption is needed.
Encrypting file traffic requires a token. Unauthenticated connections or
connections authorized via IP-based ACLs will not be encrypted even when
encryption is turned on.
- -crypt <on/off>
- This is the only option to fs setcrypt. The -crypt option
takes either "on" or "off". "on" enables
encryption. "off" disables encryption. Since this is the only
option, the "-crypt" flag may be omitted.
0 and 1 or "true" and "false" are not supported as
replacements for "on" and "off".
- Prints the online help for this command. All other valid options are
This command produces no output other than error messages.
There are only four ways to invoke fs setcrypt
. Either of:
% fs setcrypt -crypt on
% fs setcrypt on
will enable encryption for authenticated connections and:
% fs setcrypt -crypt off
% fs setcrypt off
will disable encryption.
The issuer must be logged in as the local superuser root.
The description of the fcrypt encryption mechanism at
Copyright 2007 Jason Edgecombe <firstname.lastname@example.org>
This documentation is covered by the BSD License as written in the doc/LICENSE
file. This man page was written by Jason Edgecombe for OpenAFS.