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AppArmor: Add ability to load extended policy 

Add the base support for the new policy extensions. This does not bring
any additional functionality, or change current semantics.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Kees Cook <kees@ubuntu.com>
This commit is contained in:
John Johansen 2012-02-16 07:07:53 -08:00
parent 57fa1e1809
commit ad5ff3db53
4 changed files with 50 additions and 1 deletions
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13
security/apparmor/include/apparmor.h
View File

@ -19,6 +19,19 @@
#include "match.h"
/*
* Class of mediation types in the AppArmor policy db
*/
#define AA_CLASS_ENTRY 0
#define AA_CLASS_UNKNOWN 1
#define AA_CLASS_FILE 2
#define AA_CLASS_CAP 3
#define AA_CLASS_NET 4
#define AA_CLASS_RLIMITS 5
#define AA_CLASS_DOMAIN 6
#define AA_CLASS_LAST AA_CLASS_DOMAIN
/* Control parameters settable through module/boot flags */
extern enum audit_mode aa_g_audit;
extern bool aa_g_audit_header;

13
security/apparmor/include/policy.h
View File

@ -129,6 +129,17 @@ struct aa_namespace {
struct list_head sub_ns;
};
/* struct aa_policydb - match engine for a policy
* dfa: dfa pattern match
* start: set of start states for the different classes of data
*/
struct aa_policydb {
/* Generic policy DFA specific rule types will be subsections of it */
struct aa_dfa *dfa;
unsigned int start[AA_CLASS_LAST + 1];
};
/* struct aa_profile - basic confinement data
* @base - base components of the profile (name, refcount, lists, lock ...)
* @parent: parent of profile
@ -143,6 +154,7 @@ struct aa_namespace {
* @flags: flags controlling profile behavior
* @path_flags: flags controlling path generation behavior
* @size: the memory consumed by this profiles rules
* @policy: general match rules governing policy
* @file: The set of rules governing basic file access and domain transitions
* @caps: capabilities for the profile
* @rlimits: rlimits for the profile
@ -179,6 +191,7 @@ struct aa_profile {
u32 path_flags;
int size;
struct aa_policydb policy;
struct aa_file_rules file;
struct aa_caps caps;
struct aa_rlimit rlimits;

1
security/apparmor/policy.c
View File

@ -749,6 +749,7 @@ static void free_profile(struct aa_profile *profile)
aa_free_sid(profile->sid);
aa_put_dfa(profile->xmatch);
aa_put_dfa(profile->policy.dfa);
aa_put_profile(profile->replacedby);

24
security/apparmor/policy_unpack.c
View File

@ -469,7 +469,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e)
{
struct aa_profile *profile = NULL;
const char *name = NULL;
int error = -EPROTO;
int i, error = -EPROTO;
kernel_cap_t tmpcap;
u32 tmp;
@ -562,6 +562,28 @@ static struct aa_profile *unpack_profile(struct aa_ext *e)
if (!unpack_rlimits(e, profile))
goto fail;
if (unpack_nameX(e, AA_STRUCT, "policydb")) {
/* generic policy dfa - optional and may be NULL */
profile->policy.dfa = unpack_dfa(e);
if (IS_ERR(profile->policy.dfa)) {
error = PTR_ERR(profile->policy.dfa);
profile->policy.dfa = NULL;
goto fail;
}
if (!unpack_u32(e, &profile->policy.start[0], "start"))
/* default start state */
profile->policy.start[0] = DFA_START;
/* setup class index */
for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) {
profile->policy.start[i] =
aa_dfa_next(profile->policy.dfa,
profile->policy.start[0],
i);
}
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
goto fail;
}
/* get file rules */
profile->file.dfa = unpack_dfa(e);
if (IS_ERR(profile->file.dfa)) {