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authorJohn Johansen <john.johansen@canonical.com>2012-02-16 07:07:53 -0800
committerJohn Johansen <john.johansen@canonical.com>2012-03-14 19:09:03 -0700
commitad5ff3db53c68c2f12936bc74ea5dfe0af943592 (patch)
tree72d9ac19fdca90d283a05f444870847ce5fb9f0c /security
parent57fa1e18091e66b7e1002816523cb218196a882e (diff)
downloadlinaro-lsk-ad5ff3db53c68c2f12936bc74ea5dfe0af943592.tar.gz
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>
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/include/apparmor.h13
-rw-r--r--security/apparmor/include/policy.h13
-rw-r--r--security/apparmor/policy.c1
-rw-r--r--security/apparmor/policy_unpack.c24
4 files changed, 50 insertions, 1 deletions
diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h
index 248c408ddc1..40aedd9f73e 100644
--- a/security/apparmor/include/apparmor.h
+++ b/security/apparmor/include/apparmor.h
@@ -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;
diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h
index aeda5cf5690..9e18e9609e2 100644
--- a/security/apparmor/include/policy.h
+++ b/security/apparmor/include/policy.h
@@ -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;
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 4f0eadee78b..73288d0b541 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -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);
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index c50634b724b..25fd51edc8d 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -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)) {