1 files changed, 123 insertions, 0 deletions
diff --git a/security/apparmor/crypto.c b/security/apparmor/crypto.c
new file mode 100644
index 000000000..b498ed302
--- /dev/null
+++ b/security/apparmor/crypto.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor policy loading interface function definitions.
+ *
+ * Copyright 2013 Canonical Ltd.
+ *
+ * Fns to provide a checksum of policy that has been loaded this can be
+ * compared to userspace policy compiles to check loaded policy is what
+ * it should be.
+ */
+
+#include <crypto/hash.h>
+
+#include "include/apparmor.h"
+#include "include/crypto.h"
+
+static unsigned int apparmor_hash_size;
+
+static struct crypto_shash *apparmor_tfm;
+
+unsigned int aa_hash_size(void)
+{
+	return apparmor_hash_size;
+}
+
+char *aa_calc_hash(void *data, size_t len)
+{
+	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
+	char *hash = NULL;
+	int error = -ENOMEM;
+
+	if (!apparmor_tfm)
+		return NULL;
+
+	hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
+	if (!hash)
+		goto fail;
+
+	desc->tfm = apparmor_tfm;
+
+	error = crypto_shash_init(desc);
+	if (error)
+		goto fail;
+	error = crypto_shash_update(desc, (u8 *) data, len);
+	if (error)
+		goto fail;
+	error = crypto_shash_final(desc, hash);
+	if (error)
+		goto fail;
+
+	return hash;
+
+fail:
+	kfree(hash);
+
+	return ERR_PTR(error);
+}
+
+int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
+			 size_t len)
+{
+	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
+	int error = -ENOMEM;
+	__le32 le32_version = cpu_to_le32(version);
+
+	if (!aa_g_hash_policy)
+		return 0;
+
+	if (!apparmor_tfm)
+		return 0;
+
+	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
+	if (!profile->hash)
+		goto fail;
+
+	desc->tfm = apparmor_tfm;
+
+	error = crypto_shash_init(desc);
+	if (error)
+		goto fail;
+	error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
+	if (error)
+		goto fail;
+	error = crypto_shash_update(desc, (u8 *) start, len);
+	if (error)
+		goto fail;
+	error = crypto_shash_final(desc, profile->hash);
+	if (error)
+		goto fail;
+
+	return 0;
+
+fail:
+	kfree(profile->hash);
+	profile->hash = NULL;
+
+	return error;
+}
+
+static int __init init_profile_hash(void)
+{
+	struct crypto_shash *tfm;
+
+	if (!apparmor_initialized)
+		return 0;
+
+	tfm = crypto_alloc_shash("sha1", 0, 0);
+	if (IS_ERR(tfm)) {
+		int error = PTR_ERR(tfm);
+		AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);
+		return error;
+	}
+	apparmor_tfm = tfm;
+	apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm);
+
+	aa_info_message("AppArmor sha1 policy hashing enabled");
+
+	return 0;
+}
+
+late_initcall(init_profile_hash);