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Subject[PATCH 6/7] AppArmor: Add ability to load extended policy
Date
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>
---
security/apparmor/include/apparmor.h | 13 +++++++++++++
security/apparmor/include/policy.h | 13 +++++++++++++
security/apparmor/policy.c | 1 +
security/apparmor/policy_unpack.c | 22 ++++++++++++++++++++++
4 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h
index 248c408..40aedd9 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 aeda5cf..9e18e96 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 537e5dc..8b7febb 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -752,6 +752,7 @@ 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 6137b10..c7a6d03 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -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)) {
--
1.7.9


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