apparmor: add the ability to report a sha1 hash of loaded policy

Provide userspace the ability to introspect a sha1 hash value for each
profile currently loaded.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>

3 files changed, 38 insertions, 0 deletions

diff --git a/security/apparmor/include/apparmorfs.h b/security/apparmor/include/apparmorfs.h
index f91712cf1b3..414e56878dd 100644
--- a/security/apparmor/include/apparmorfs.h
+++ b/security/apparmor/include/apparmorfs.h
@@ -82,6 +82,7 @@ enum aafs_prof_type {
 	AAFS_PROF_NAME,
 	AAFS_PROF_MODE,
 	AAFS_PROF_ATTACH,
+	AAFS_PROF_HASH,
 	AAFS_PROF_SIZEOF,
 };
 
diff --git a/security/apparmor/include/crypto.h b/security/apparmor/include/crypto.h
new file mode 100644
index 00000000000..dc418e5024d
--- /dev/null
+++ b/security/apparmor/include/crypto.h
@@ -0,0 +1,36 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor policy loading interface function definitions.
+ *
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#ifndef __APPARMOR_CRYPTO_H
+#define __APPARMOR_CRYPTO_H
+
+#include "policy.h"
+
+#ifdef CONFIG_SECURITY_APPARMOR_HASH
+unsigned int aa_hash_size(void);
+int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
+			 size_t len);
+#else
+static inline int aa_calc_profile_hash(struct aa_profile *profile, u32 version,
+				       void *start, size_t len)
+{
+	return 0;
+}
+
+static inline unsigned int aa_hash_size(void)
+{
+	return 0;
+}
+#endif
+
+#endif /* __APPARMOR_CRYPTO_H */
diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h
index 59b36372ae4..f2d4b6348cb 100644
--- a/security/apparmor/include/policy.h
+++ b/security/apparmor/include/policy.h
@@ -219,6 +219,7 @@ struct aa_profile {
 	struct aa_caps caps;
 	struct aa_rlimit rlimits;
 
+	unsigned char *hash;
 	char *dirname;
 	struct dentry *dents[AAFS_PROF_SIZEOF];
 };