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From: David Howells <dhowells@redhat.com>
To: torvalds@linux-foundation.org, viro@zeniv.linux.org.uk
Cc: Stephen Smalley <sds@tycho.nsa.gov>,
	dhowells@redhat.com, casey@schaufler-ca.comsds@tycho.nsa.gov,
	nicolas.dichtel@6wind.com, raven@themaw.net,
	christian@brauner.io, andres@anarazel.de, jlayton@redhat.com,
	dray@redhat.com, kzak@redhat.com, keyrings@vger.kernel.org,
	linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 10/17] selinux: Implement the watch_key security hook [ver #5]
Date: Wed, 18 Mar 2020 15:04:46 +0000	[thread overview]
Message-ID: <158454388633.2863966.17799427202351674141.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <158454378820.2863966.10496767254293183123.stgit@warthog.procyon.org.uk>

Implement the watch_key security hook to make sure that a key grants the
caller View permission in order to set a watch on a key.

For the moment, the watch_devices security hook is left unimplemented as
it's not obvious what the object should be since the queue is global and
didn't previously exist.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
---

 security/selinux/hooks.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 1659b59fb5d7..2c19ac4d7894 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6563,6 +6563,17 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
 	*_buffer = context;
 	return rc;
 }
+
+#ifdef CONFIG_KEY_NOTIFICATIONS
+static int selinux_watch_key(struct key *key)
+{
+	struct key_security_struct *ksec = key->security;
+	u32 sid = current_sid();
+
+	return avc_has_perm(&selinux_state,
+			    sid, ksec->sid, SECCLASS_KEY, KEY_NEED_VIEW, NULL);
+}
+#endif
 #endif
 
 #ifdef CONFIG_SECURITY_INFINIBAND
@@ -7078,6 +7089,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(key_free, selinux_key_free),
 	LSM_HOOK_INIT(key_permission, selinux_key_permission),
 	LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),
+#ifdef CONFIG_KEY_NOTIFICATIONS
+	LSM_HOOK_INIT(watch_key, selinux_watch_key),
+#endif
 #endif
 
 #ifdef CONFIG_AUDIT

WARNING: multiple messages have this Message-ID
From: David Howells <dhowells@redhat.com>
To: torvalds@linux-foundation.org, viro@zeniv.linux.org.uk
Cc: Stephen Smalley <sds@tycho.nsa.gov>,
	dhowells@redhat.com, casey@schaufler-ca.com, sds@tycho.nsa.gov,
	nicolas.dichtel@6wind.com, raven@themaw.net,
	christian@brauner.io, andres@anarazel.de, jlayton@redhat.com,
	dray@redhat.com, kzak@redhat.com, keyrings@vger.kernel.org,
	linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 10/17] selinux: Implement the watch_key security hook [ver #5]
Date: Wed, 18 Mar 2020 15:04:46 +0000	[thread overview]
Message-ID: <158454388633.2863966.17799427202351674141.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <158454378820.2863966.10496767254293183123.stgit@warthog.procyon.org.uk>

Implement the watch_key security hook to make sure that a key grants the
caller View permission in order to set a watch on a key.

For the moment, the watch_devices security hook is left unimplemented as
it's not obvious what the object should be since the queue is global and
didn't previously exist.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
---

 security/selinux/hooks.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 1659b59fb5d7..2c19ac4d7894 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6563,6 +6563,17 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
 	*_buffer = context;
 	return rc;
 }
+
+#ifdef CONFIG_KEY_NOTIFICATIONS
+static int selinux_watch_key(struct key *key)
+{
+	struct key_security_struct *ksec = key->security;
+	u32 sid = current_sid();
+
+	return avc_has_perm(&selinux_state,
+			    sid, ksec->sid, SECCLASS_KEY, KEY_NEED_VIEW, NULL);
+}
+#endif
 #endif
 
 #ifdef CONFIG_SECURITY_INFINIBAND
@@ -7078,6 +7089,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(key_free, selinux_key_free),
 	LSM_HOOK_INIT(key_permission, selinux_key_permission),
 	LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),
+#ifdef CONFIG_KEY_NOTIFICATIONS
+	LSM_HOOK_INIT(watch_key, selinux_watch_key),
+#endif
 #endif
 
 #ifdef CONFIG_AUDIT



  parent reply	other threads:[~2020-03-18 15:04 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-18 15:03 [PATCH 00/17] pipe: Keyrings, mount and superblock notifications " David Howells
2020-03-18 15:03 ` David Howells
2020-03-18 15:03 ` [PATCH 01/17] uapi: General notification queue definitions " David Howells
2020-03-18 15:03 ` [PATCH 02/17] security: Add hooks to rule on setting a watch " David Howells
2020-03-18 15:03   ` David Howells
2020-03-18 18:56   ` James Morris
2020-03-18 18:56     ` James Morris
2020-03-18 15:03 ` [PATCH 03/17] security: Add a hook for the point of notification insertion " David Howells
2020-03-18 15:03   ` David Howells
2020-03-18 18:57   ` James Morris
2020-03-18 18:57     ` James Morris
2020-03-18 15:03 ` [PATCH 04/17] pipe: Add O_NOTIFICATION_PIPE " David Howells
2020-03-18 15:03 ` [PATCH 05/17] pipe: Add general notification queue support " David Howells
2020-03-18 15:03   ` David Howells
2020-03-18 15:04 ` [PATCH 06/17] watch_queue: Add a key/keyring notification facility " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 19:04   ` James Morris
2020-03-18 19:04     ` James Morris
2020-03-18 15:04 ` [PATCH 07/17] Add sample notification program " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:04 ` [PATCH 08/17] pipe: Allow buffers to be marked read-whole-or-error for notifications " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:04 ` [PATCH 09/17] pipe: Add notification lossage handling " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:04 ` David Howells [this message]
2020-03-18 15:04   ` [PATCH 10/17] selinux: Implement the watch_key security hook " David Howells
2020-03-18 19:06   ` James Morris
2020-03-18 19:06     ` James Morris
2020-03-18 15:04 ` [PATCH 11/17] smack: Implement the watch_key and post_notification hooks " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:05 ` [PATCH 12/17] watch_queue: Add security hooks to rule on setting mount and sb watches " David Howells
2020-03-18 15:05   ` David Howells
2020-03-18 19:07   ` James Morris
2020-03-18 19:07     ` James Morris
2020-03-18 15:05 ` [PATCH 13/17] watch_queue: Implement mount topology and attribute change notifications " David Howells
2020-03-18 15:05   ` David Howells
2020-04-02 15:19   ` Miklos Szeredi
2020-04-02 15:19     ` Miklos Szeredi
2020-06-14  3:07     ` Ian Kent
2020-06-14  3:07       ` Ian Kent
2020-06-15  8:44       ` Miklos Szeredi
2020-06-15  8:44         ` Miklos Szeredi
2020-07-23 10:48   ` David Howells
2020-07-23 10:48     ` David Howells
2020-08-03  9:29     ` Miklos Szeredi
2020-08-03  9:29       ` Miklos Szeredi
2020-08-04 11:38       ` Ian Kent
2020-08-04 11:38         ` Ian Kent
2020-08-04 13:19         ` Miklos Szeredi
2020-08-04 13:19           ` Miklos Szeredi
2020-08-05  1:53           ` Ian Kent
2020-08-05  1:53             ` Ian Kent
2020-08-05  7:43             ` Miklos Szeredi
2020-08-05  7:43               ` Miklos Szeredi
2020-08-05 11:36               ` Ian Kent
2020-08-05 11:36                 ` Ian Kent
2020-08-05 11:56                 ` Miklos Szeredi
2020-08-05 11:56                   ` Miklos Szeredi
2020-07-24 10:19   ` David Howells
2020-07-24 10:19     ` David Howells
2020-07-24 10:44     ` Ian Kent
2020-07-24 10:44       ` Ian Kent
2020-07-24 11:36     ` David Howells
2020-07-24 11:36       ` David Howells
2020-08-03 10:02       ` Miklos Szeredi
2020-08-03 10:02         ` Miklos Szeredi
2020-08-03 10:08       ` David Howells
2020-08-03 10:08         ` David Howells
2020-08-03 10:18       ` David Howells
2020-08-03 10:18         ` David Howells
2020-08-03 11:17         ` Miklos Szeredi
2020-08-03 11:17           ` Miklos Szeredi
2020-08-03 11:49         ` David Howells
2020-08-03 11:49           ` David Howells
2020-08-03 12:01           ` Ian Kent
2020-08-03 12:01             ` Ian Kent
2020-08-03 12:31           ` David Howells
2020-08-03 12:31             ` David Howells
2020-08-03 14:30             ` Ian Kent
2020-08-03 14:30               ` Ian Kent
2020-03-18 15:05 ` [PATCH 14/17] watch_queue: sample: Display mount tree " David Howells
2020-03-18 15:05   ` David Howells
2020-03-18 15:05 ` [PATCH 15/17] watch_queue: Introduce a non-repeating system-unique superblock ID " David Howells
2020-03-18 15:05 ` [PATCH 16/17] watch_queue: Add superblock notifications " David Howells
2020-03-18 15:05   ` David Howells
2020-03-18 15:05 ` [PATCH 17/17] watch_queue: sample: Display " David Howells
2020-03-18 15:05   ` David Howells

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