linux-toradex.git/security/smack/smack.h, branch v3.0.18

LSM: separate LSM_AUDIT_DATA_DENTRY from LSM_AUDIT_DATA_PATH

2011-04-25T22:14:07+00:00

This patch separates and audit message that only contains a dentry from
one that contains a full path.  This allows us to make it harder to
misuse the interfaces or for the interfaces to be implemented wrong.

Signed-off-by: Eric Paris 
Acked-by: Casey Schaufler

LSM: split LSM_AUDIT_DATA_FS into _PATH and _INODE

2011-04-25T22:13:15+00:00

The lsm common audit code has wacky contortions making sure which pieces
of information are set based on if it was given a path, dentry, or
inode.  Split this into path and inode to get rid of some of the code
complexity.

Signed-off-by: Eric Paris 
Acked-by: Casey Schaufler

security:smack: kill unused SMACK_LIST_MAX, MAY_ANY and MAY_ANYWRITE

2011-02-10T03:58:11+00:00

Kill unused macros of SMACK_LIST_MAX, MAY_ANY and MAY_ANYWRITE.
v2: As Casey Schaufler's advice, also remove MAY_ANY.

Signed-off-by: Shan Wei 
Signed-off-by: Casey Schaufler

Subject: [PATCH] Smack: mmap controls for library containment

2011-01-17T16:05:27+00:00

  In the embedded world there are often situations
  where libraries are updated from a variety of sources,
  for a variety of reasons, and with any number of
  security characteristics. These differences
  might include privilege required for a given library
  provided interface to function properly, as occurs
  from time to time in graphics libraries. There are
  also cases where it is important to limit use of
  libraries based on the provider of the library and
  the security aware application may make choices
  based on that criteria.

  These issues are addressed by providing an additional
  Smack label that may optionally be assigned to an object,
  the SMACK64MMAP attribute. An mmap operation is allowed
  if there is no such attribute.

  If there is a SMACK64MMAP attribute the mmap is permitted
  only if a subject with that label has all of the access
  permitted a subject with the current task label.

  Security aware applications may from time to time
  wish to reduce their "privilege" to avoid accidental use
  of privilege. One case where this arises is the
  environment in which multiple sources provide libraries
  to perform the same functions. An application may know
  that it should eschew services made available from a
  particular vendor, or of a particular version.

  In support of this a secondary list of Smack rules has
  been added that is local to the task. This list is
  consulted only in the case where the global list has
  approved access. It can only further restrict access.
  Unlike the global last, if no entry is found on the
  local list access is granted. An application can add
  entries to its own list by writing to /smack/load-self.

  The changes appear large as they involve refactoring
  the list handling to accomodate there being more
  than one rule list.

Signed-off-by: Casey Schaufler

Smack: Transmute labels on specified directories

2010-12-07T22:04:02+00:00

In a situation where Smack access rules allow processes
with multiple labels to write to a directory it is easy
to get into a situation where the directory gets cluttered
with files that the owner can't deal with because while
they could be written to the directory a process at the
label of the directory can't write them. This is generally
the desired behavior, but when it isn't it is a real
issue.

This patch introduces a new attribute SMACK64TRANSMUTE that
instructs Smack to create the file with the label of the directory
under certain circumstances.

A new access mode, "t" for transmute, is made available to
Smack access rules, which are expanded from "rwxa" to "rwxat".
If a file is created in a directory marked as transmutable
and if access was granted to perform the operation by a rule
that included the transmute mode, then the file gets the
Smack label of the directory instead of the Smack label of the
creating process.

Note that this is equivalent to creating an empty file at the
label of the directory and then having the other process write
to it. The transmute scheme requires that both the access rule
allows transmutation and that the directory be explicitly marked.

Signed-off-by: Jarkko Sakkinen 
Signed-off-by: Casey Schaufler

This patch adds a new security attribute to Smack called

2010-12-02T14:43:39+00:00

SMACK64EXEC. It defines label that is used while task is
running.

Exception: in smack_task_wait() child task is checked
for write access to parent task using label inherited
from the task that forked it.

Fixed issues from previous submit:
- SMACK64EXEC was not read when SMACK64 was not set.
- inode security blob was not updated after setting
  SMACK64EXEC
- inode security blob was not updated when removing
  SMACK64EXEC

security: move LSM xattrnames to xattr.h

2010-08-02T05:34:57+00:00

Make the security extended attributes names global. Updated to move
the remaining Smack xattrs.

Signed-off-by: Mimi Zohar 
Acked-by: Serge Hallyn 
Signed-off-by: James Morris

security: Make lsm_priv union in lsm_audit.h anonymous

2009-07-09T22:58:39+00:00

Made the lsm_priv union in include/linux/lsm_audit.h
anonymous.

Signed-off-by: Thomas Liu 
Acked-by: Eric Paris 
Signed-off-by: James Morris

Move variable function in lsm_audit.h into SMACK private space

2009-07-09T22:54:14+00:00

Moved variable function in include/linux/lsm_audit.h into the
smack_audit_data struct since it is never used outside of it.

Also removed setting of function in the COMMON_AUDIT_DATA_INIT
macro because that variable is now private to SMACK.

Signed-off-by: Thomas Liu 
Acked-by: Eric Paris 
I-dont-see-any-problems-with-it: Casey Schaufler 
Signed-off-by: James Morris

smack: implement logging V3

2009-04-13T23:00:23+00:00

the following patch, add logging of Smack security decisions.
This is of course very useful to understand what your current smack policy does.
As suggested by Casey, it also now forbids labels with ', " or \

It introduces a '/smack/logging' switch :
0: no logging
1: log denied (default)
2: log accepted
3: log denied&accepted

Signed-off-by: Etienne Basset 
Acked-by: Casey Schaufler 
Acked-by: Eric Paris 
Signed-off-by: James Morris