Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-2.6

[linux-2.6] / fs / cifs / README

diff --git a/fs/cifs/README b/fs/cifs/README
index 621aa1a85971394d37424e2a50c9cf71c9aa2146..68b5c1169d9d7e3eff5a3aff67cfb60980fa2050 100644 (file)
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -483,6 +483,11 @@ A partial list of the supported mount options follows:
  sign           Must use packet signing (helps avoid unwanted data modification
                by intermediate systems in the route).  Note that signing
                does not work with lanman or plaintext authentication.
+ seal           Must seal (encrypt) all data on this mounted share before
+               sending on the network.  Requires support for Unix Extensions.
+               Note that this differs from the sign mount option in that it
+               causes encryption of data sent over this mounted share but other
+               shares mounted to the same server are unaffected.
  sec            Security mode.  Allowed values are:
                        none    attempt to connection as a null user (no name)
                        krb5    Use Kerberos version 5 authentication
@@ -637,8 +642,30 @@ The statistics for the number of total SMBs and oplock breaks are different in
 that they represent all for that share, not just those for which the server
 returned success.
        
-Also note that "cat /proc/fs/cifs/DebugData" will display information about 
+Also note that "cat /proc/fs/cifs/DebugData" will display information about
 the active sessions and the shares that are mounted.
-Enabling Kerberos (extended security) works when CONFIG_CIFS_EXPERIMENTAL is
-on but requires a user space helper (from the Samba project). NTLM and NTLMv2 and
-LANMAN support do not require this helper.
+
+Enabling Kerberos (extended security) works but requires version 1.2 or later
+of the helper program cifs.upcall to be present and to be configured in the
+/etc/request-key.conf file.  The cifs.upcall helper program is from the Samba
+project(http://www.samba.org). NTLM and NTLMv2 and LANMAN support do not
+require this helper. Note that NTLMv2 security (which does not require the
+cifs.upcall helper program), instead of using Kerberos, is sufficient for
+some use cases.
+
+Enabling DFS support (used to access shares transparently in an MS-DFS
+global name space) requires that CONFIG_CIFS_EXPERIMENTAL be enabled.  In
+addition, DFS support for target shares which are specified as UNC
+names which begin with host names (rather than IP addresses) requires
+a user space helper (such as cifs.upcall) to be present in order to
+translate host names to ip address, and the user space helper must also
+be configured in the file /etc/request-key.conf
+
+To use cifs Kerberos and DFS support, the Linux keyutils package should be
+installed and something like the following lines should be added to the
+/etc/request-key.conf file:
+
+create cifs.spnego * * /usr/local/sbin/cifs.upcall %k
+create dns_resolver * * /usr/local/sbin/cifs.upcall %k
+
+