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| author | Casey Schaufler <casey@schaufler-ca.com> | 2014-08-27 14:51:27 -0700 |
|---|---|---|
| committer | Casey Schaufler <casey@schaufler-ca.com> | 2014-08-28 13:11:56 -0700 |
| commit | d166c8024d620d654b12834fac354fb4203c6c22 (patch) | |
| tree | d804064cb7fce9448071691ae5a6260dc35674db /security/smack/smack.h | |
| parent | d83d2c26461d661384676a4eed935d925b0fcc34 (diff) | |
| download | lwn-d166c8024d620d654b12834fac354fb4203c6c22.tar.gz lwn-d166c8024d620d654b12834fac354fb4203c6c22.zip | |
Smack: Bring-up access mode
People keep asking me for permissive mode, and I keep saying "no".
Permissive mode is wrong for more reasons than I can enumerate,
but the compelling one is that it's once on, never off.
Nonetheless, there is an argument to be made for running a
process with lots of permissions, logging which are required,
and then locking the process down. There wasn't a way to do
that with Smack, but this provides it.
The notion is that you start out by giving the process an
appropriate Smack label, such as "ATBirds". You create rules
with a wide range of access and the "b" mode. On Tizen it
might be:
ATBirds System rwxalb
ATBirds User rwxalb
ATBirds _ rwxalb
User ATBirds wb
System ATBirds wb
Accesses that fail will generate audit records. Accesses
that succeed because of rules marked with a "b" generate
log messages identifying the rule, the program and as much
object information as is convenient.
When the system is properly configured and the programs
brought in line with the labeling scheme the "b" mode can
be removed from the rules. When the system is ready for
production the facility can be configured out.
This provides the developer the convenience of permissive
mode without creating a system that looks like it is
enforcing a policy while it is not.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack/smack.h')
| -rw-r--r-- | security/smack/smack.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h index 020307ef0972..2d13d5fb17ed 100644 --- a/security/smack/smack.h +++ b/security/smack/smack.h @@ -191,6 +191,7 @@ struct smk_port_label { */ #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */ #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */ +#define MAY_BRINGUP 0x00004000 /* Report use of this rule */ /* * Just to make the common cases easier to deal with @@ -200,9 +201,9 @@ struct smk_port_label { #define MAY_NOT 0 /* - * Number of access types used by Smack (rwxatl) + * Number of access types used by Smack (rwxatlb) */ -#define SMK_NUM_ACCESS_TYPE 6 +#define SMK_NUM_ACCESS_TYPE 7 /* SMACK data */ struct smack_audit_data { |