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Message-Id: <20200224160215.4136-4-mic@digikod.net>
Date: Mon, 24 Feb 2020 17:02:08 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: linux-kernel@...r.kernel.org
Cc: Mickaël Salaün <mic@...ikod.net>,
Al Viro <viro@...iv.linux.org.uk>,
Andy Lutomirski <luto@...capital.net>,
Arnd Bergmann <arnd@...db.de>,
Casey Schaufler <casey@...aufler-ca.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
James Morris <jmorris@...ei.org>,
Jann Horn <jann@...jh.net>,
Jonathan Corbet <corbet@....net>,
Kees Cook <keescook@...omium.org>,
Michael Kerrisk <mtk.manpages@...il.com>,
Mickaël Salaün <mickael.salaun@....gouv.fr>,
"Serge E . Hallyn" <serge@...lyn.com>,
Shuah Khan <shuah@...nel.org>,
Vincent Dagonneau <vincent.dagonneau@....gouv.fr>,
kernel-hardening@...ts.openwall.com,
linux-api@...r.kernel.org,
linux-arch@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-fsdevel@...r.kernel.org,
linux-kselftest@...r.kernel.org,
linux-security-module@...r.kernel.org,
x86@...nel.org
Subject: [RFC PATCH v14 03/10] landlock: Set up the security framework and manage credentials
A process credentials point to a Landlock domain, which is underneath
implemented with a ruleset. In the following commits, this domain is
used to check and enforce the ptrace and filesystem security policies.
A domain is inherited from a parent to its child the same way a thread
inherits a seccomp policy.
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: James Morris <jmorris@...ei.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Serge E. Hallyn <serge@...lyn.com>
---
Changes since v13:
* totally get ride of the seccomp dependency
* only keep credential management and LSM setup.
Previous version:
https://lore.kernel.org/lkml/20191104172146.30797-4-mic@digikod.net/
---
security/Kconfig | 10 +++----
security/landlock/Makefile | 3 ++-
security/landlock/cred.c | 47 ++++++++++++++++++++++++++++++++
security/landlock/cred.h | 55 ++++++++++++++++++++++++++++++++++++++
security/landlock/setup.c | 30 +++++++++++++++++++++
security/landlock/setup.h | 18 +++++++++++++
6 files changed, 157 insertions(+), 6 deletions(-)
create mode 100644 security/landlock/cred.c
create mode 100644 security/landlock/cred.h
create mode 100644 security/landlock/setup.c
create mode 100644 security/landlock/setup.h
diff --git a/security/Kconfig b/security/Kconfig
index 9d9981394fb0..76547b5c694d 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -278,11 +278,11 @@ endchoice
config LSM
string "Ordered list of enabled LSMs"
- default "lockdown,yama,loadpin,safesetid,integrity,smack,selinux,tomoyo,apparmor" if DEFAULT_SECURITY_SMACK
- default "lockdown,yama,loadpin,safesetid,integrity,apparmor,selinux,smack,tomoyo" if DEFAULT_SECURITY_APPARMOR
- default "lockdown,yama,loadpin,safesetid,integrity,tomoyo" if DEFAULT_SECURITY_TOMOYO
- default "lockdown,yama,loadpin,safesetid,integrity" if DEFAULT_SECURITY_DAC
- default "lockdown,yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor"
+ default "landlock,lockdown,yama,loadpin,safesetid,integrity,smack,selinux,tomoyo,apparmor" if DEFAULT_SECURITY_SMACK
+ default "landlock,lockdown,yama,loadpin,safesetid,integrity,apparmor,selinux,smack,tomoyo" if DEFAULT_SECURITY_APPARMOR
+ default "landlock,lockdown,yama,loadpin,safesetid,integrity,tomoyo" if DEFAULT_SECURITY_TOMOYO
+ default "landlock,lockdown,yama,loadpin,safesetid,integrity" if DEFAULT_SECURITY_DAC
+ default "landlock,lockdown,yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor"
help
A comma-separated list of LSMs, in initialization order.
Any LSMs left off this list will be ignored. This can be
diff --git a/security/landlock/Makefile b/security/landlock/Makefile
index d846eba445bb..041ea242e627 100644
--- a/security/landlock/Makefile
+++ b/security/landlock/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_SECURITY_LANDLOCK) := landlock.o
-landlock-y := object.o ruleset.o
+landlock-y := setup.o object.o ruleset.o \
+ cred.o
diff --git a/security/landlock/cred.c b/security/landlock/cred.c
new file mode 100644
index 000000000000..69ef93e29a53
--- /dev/null
+++ b/security/landlock/cred.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Landlock LSM - Credential hooks
+ *
+ * Copyright © 2017-2019 Mickaël Salaün <mic@...ikod.net>
+ * Copyright © 2018-2019 ANSSI
+ */
+
+#include <linux/cred.h>
+#include <linux/lsm_hooks.h>
+
+#include "cred.h"
+#include "ruleset.h"
+#include "setup.h"
+
+static int hook_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ const struct landlock_cred_security *cred_old = landlock_cred(old);
+ struct landlock_cred_security *cred_new = landlock_cred(new);
+ struct landlock_ruleset *dom_old;
+
+ dom_old = cred_old->domain;
+ if (dom_old) {
+ landlock_get_ruleset(dom_old);
+ cred_new->domain = dom_old;
+ } else {
+ cred_new->domain = NULL;
+ }
+ return 0;
+}
+
+static void hook_cred_free(struct cred *cred)
+{
+ landlock_put_ruleset_enqueue(landlock_cred(cred)->domain);
+}
+
+static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
+ LSM_HOOK_INIT(cred_prepare, hook_cred_prepare),
+ LSM_HOOK_INIT(cred_free, hook_cred_free),
+};
+
+__init void landlock_add_hooks_cred(void)
+{
+ security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
+ LANDLOCK_NAME);
+}
diff --git a/security/landlock/cred.h b/security/landlock/cred.h
new file mode 100644
index 000000000000..1e24682ee27e
--- /dev/null
+++ b/security/landlock/cred.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Landlock LSM - Credential hooks
+ *
+ * Copyright © 2019 Mickaël Salaün <mic@...ikod.net>
+ * Copyright © 2019 ANSSI
+ */
+
+#ifndef _SECURITY_LANDLOCK_CRED_H
+#define _SECURITY_LANDLOCK_CRED_H
+
+#include <linux/cred.h>
+#include <linux/init.h>
+#include <linux/rcupdate.h>
+
+#include "ruleset.h"
+#include "setup.h"
+
+struct landlock_cred_security {
+ struct landlock_ruleset *domain;
+};
+
+static inline struct landlock_cred_security *landlock_cred(
+ const struct cred *cred)
+{
+ return cred->security + landlock_blob_sizes.lbs_cred;
+}
+
+static inline struct landlock_ruleset *landlock_get_current_domain(void)
+{
+ return landlock_cred(current_cred())->domain;
+}
+
+/*
+ * The caller needs an RCU lock.
+ */
+static inline struct landlock_ruleset *landlock_get_task_domain(
+ struct task_struct *task)
+{
+ return landlock_cred(__task_cred(task))->domain;
+}
+
+static inline bool landlocked(struct task_struct *task)
+{
+ bool has_dom;
+
+ rcu_read_lock();
+ has_dom = !!landlock_get_task_domain(task);
+ rcu_read_unlock();
+ return has_dom;
+}
+
+__init void landlock_add_hooks_cred(void);
+
+#endif /* _SECURITY_LANDLOCK_CRED_H */
diff --git a/security/landlock/setup.c b/security/landlock/setup.c
new file mode 100644
index 000000000000..fca5fa185465
--- /dev/null
+++ b/security/landlock/setup.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Landlock LSM - Security framework setup
+ *
+ * Copyright © 2016-2020 Mickaël Salaün <mic@...ikod.net>
+ * Copyright © 2018-2020 ANSSI
+ */
+
+#include <linux/init.h>
+#include <linux/lsm_hooks.h>
+
+#include "cred.h"
+#include "setup.h"
+
+struct lsm_blob_sizes landlock_blob_sizes __lsm_ro_after_init = {
+ .lbs_cred = sizeof(struct landlock_cred_security),
+};
+
+static int __init landlock_init(void)
+{
+ pr_info(LANDLOCK_NAME ": Registering hooks\n");
+ landlock_add_hooks_cred();
+ return 0;
+}
+
+DEFINE_LSM(LANDLOCK_NAME) = {
+ .name = LANDLOCK_NAME,
+ .init = landlock_init,
+ .blobs = &landlock_blob_sizes,
+};
diff --git a/security/landlock/setup.h b/security/landlock/setup.h
new file mode 100644
index 000000000000..52eb8d806376
--- /dev/null
+++ b/security/landlock/setup.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Landlock LSM - Security framework setup
+ *
+ * Copyright © 2016-2020 Mickaël Salaün <mic@...ikod.net>
+ * Copyright © 2018-2020 ANSSI
+ */
+
+#ifndef _SECURITY_LANDLOCK_SETUP_H
+#define _SECURITY_LANDLOCK_SETUP_H
+
+#include <linux/lsm_hooks.h>
+
+#define LANDLOCK_NAME "landlock"
+
+extern struct lsm_blob_sizes landlock_blob_sizes;
+
+#endif /* _SECURITY_LANDLOCK_SETUP_H */
--
2.25.0
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