Targeted at the 2.6.18 merge window, please apply. Has passed David's
testsuite.
From: Michael LeMay <[email protected]>
Introduce SELinux hooks to support the access key retention subsystem
within the kernel. Incorporate new flask headers from a modified version
of the SELinux reference policy, with support for the new security class
representing retained keys. Extend the "key_alloc" security hook with a
task parameter representing the intended ownership context for the key
being allocated. Attach security information to root's default keyrings
within the SELinux initialization routine.
Signed-off-by: Michael LeMay <[email protected]>
Signed-off-by: David Howells <[email protected]>
Signed-off-by: James Morris <[email protected]>
---
Documentation/keys.txt | 29 ++++++++++++
include/linux/key.h | 18 +++++--
include/linux/security.h | 10 ++--
kernel/user.c | 2
security/dummy.c | 2
security/keys/key.c | 8 +--
security/keys/keyring.c | 5 +-
security/keys/process_keys.c | 15 +++---
security/keys/request_key.c | 6 +-
security/keys/request_key_auth.c | 2
security/selinux/hooks.c | 64 +++++++++++++++++++++++++++
security/selinux/include/av_perm_to_string.h | 6 ++
security/selinux/include/av_permissions.h | 8 +++
security/selinux/include/class_to_string.h | 1
security/selinux/include/flask.h | 1
security/selinux/include/objsec.h | 5 ++
16 files changed, 155 insertions(+), 27 deletions(-)
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/Documentation/keys.txt linux-2.6.17-rc5-mm1/Documentation/keys.txt
--- linux-2.6.17-rc5-mm1.orig/Documentation/keys.txt 2006-05-31 09:47:43.000000000 -0400
+++ linux-2.6.17-rc5-mm1/Documentation/keys.txt 2006-06-02 09:42:07.000000000 -0400
@@ -19,6 +19,7 @@ This document has the following sections
- Key overview
- Key service overview
- Key access permissions
+ - SELinux support
- New procfs files
- Userspace system call interface
- Kernel services
@@ -232,6 +233,34 @@ For changing the ownership, group ID or
the key or having the sysadmin capability is sufficient.
+===============
+SELINUX SUPPORT
+===============
+
+The security class "key" has been added to SELinux so that mandatory access
+controls can be applied to keys created within various contexts. This support
+is preliminary, and is likely to change quite significantly in the near future.
+Currently, all of the basic permissions explained above are provided in SELinux
+as well; SE Linux is simply invoked after all basic permission checks have been
+performed.
+
+Each key is labeled with the same context as the task to which it belongs.
+Typically, this is the same task that was running when the key was created.
+The default keyrings are handled differently, but in a way that is very
+intuitive:
+
+ (*) The user and user session keyrings that are created when the user logs in
+ are currently labeled with the context of the login manager.
+
+ (*) The keyrings associated with new threads are each labeled with the context
+ of their associated thread, and both session and process keyrings are
+ handled similarly.
+
+Note, however, that the default keyrings associated with the root user are
+labeled with the default kernel context, since they are created early in the
+boot process, before root has a chance to log in.
+
+
================
NEW PROCFS FILES
================
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/include/linux/key.h linux-2.6.17-rc5-mm1/include/linux/key.h
--- linux-2.6.17-rc5-mm1.orig/include/linux/key.h 2006-05-31 09:48:38.000000000 -0400
+++ linux-2.6.17-rc5-mm1/include/linux/key.h 2006-05-31 10:03:00.000000000 -0400
@@ -246,8 +246,9 @@ extern void unregister_key_type(struct k
extern struct key *key_alloc(struct key_type *type,
const char *desc,
- uid_t uid, gid_t gid, key_perm_t perm,
- int not_in_quota);
+ uid_t uid, gid_t gid,
+ struct task_struct *ctx,
+ key_perm_t perm, int not_in_quota);
extern int key_payload_reserve(struct key *key, size_t datalen);
extern int key_instantiate_and_link(struct key *key,
const void *data,
@@ -297,7 +298,9 @@ extern int key_unlink(struct key *keyrin
struct key *key);
extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
- int not_in_quota, struct key *dest);
+ struct task_struct *ctx,
+ int not_in_quota,
+ struct key *dest);
extern int keyring_clear(struct key *keyring);
@@ -318,7 +321,8 @@ extern void keyring_replace_payload(stru
* the userspace interface
*/
extern struct key root_user_keyring, root_session_keyring;
-extern int alloc_uid_keyring(struct user_struct *user);
+extern int alloc_uid_keyring(struct user_struct *user,
+ struct task_struct *ctx);
extern void switch_uid_keyring(struct user_struct *new_user);
extern int copy_keys(unsigned long clone_flags, struct task_struct *tsk);
extern int copy_thread_group_keys(struct task_struct *tsk);
@@ -347,7 +351,7 @@ extern void key_init(void);
#define make_key_ref(k) ({ NULL; })
#define key_ref_to_ptr(k) ({ NULL; })
#define is_key_possessed(k) 0
-#define alloc_uid_keyring(u) 0
+#define alloc_uid_keyring(u,c) 0
#define switch_uid_keyring(u) do { } while(0)
#define __install_session_keyring(t, k) ({ NULL; })
#define copy_keys(f,t) 0
@@ -360,6 +364,10 @@ extern void key_init(void);
#define key_fsgid_changed(t) do { } while(0)
#define key_init() do { } while(0)
+/* Initial keyrings */
+extern struct key root_user_keyring;
+extern struct key root_session_keyring;
+
#endif /* CONFIG_KEYS */
#endif /* __KERNEL__ */
#endif /* _LINUX_KEY_H */
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/include/linux/security.h linux-2.6.17-rc5-mm1/include/linux/security.h
--- linux-2.6.17-rc5-mm1.orig/include/linux/security.h 2006-05-31 09:48:39.000000000 -0400
+++ linux-2.6.17-rc5-mm1/include/linux/security.h 2006-05-31 10:03:00.000000000 -0400
@@ -1305,7 +1305,7 @@ struct security_operations {
/* key management security hooks */
#ifdef CONFIG_KEYS
- int (*key_alloc)(struct key *key);
+ int (*key_alloc)(struct key *key, struct task_struct *tsk);
void (*key_free)(struct key *key);
int (*key_permission)(key_ref_t key_ref,
struct task_struct *context,
@@ -2980,9 +2980,10 @@ static inline int security_xfrm_policy_l
#ifdef CONFIG_KEYS
#ifdef CONFIG_SECURITY
-static inline int security_key_alloc(struct key *key)
+static inline int security_key_alloc(struct key *key,
+ struct task_struct *tsk)
{
- return security_ops->key_alloc(key);
+ return security_ops->key_alloc(key, tsk);
}
static inline void security_key_free(struct key *key)
@@ -2999,7 +3000,8 @@ static inline int security_key_permissio
#else
-static inline int security_key_alloc(struct key *key)
+static inline int security_key_alloc(struct key *key,
+ struct task_struct *tsk)
{
return 0;
}
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/kernel/user.c linux-2.6.17-rc5-mm1/kernel/user.c
--- linux-2.6.17-rc5-mm1.orig/kernel/user.c 2006-05-31 09:48:43.000000000 -0400
+++ linux-2.6.17-rc5-mm1/kernel/user.c 2006-05-31 10:03:00.000000000 -0400
@@ -148,7 +148,7 @@ struct user_struct * alloc_uid(uid_t uid
new->mq_bytes = 0;
new->locked_shm = 0;
- if (alloc_uid_keyring(new) < 0) {
+ if (alloc_uid_keyring(new, current) < 0) {
kmem_cache_free(uid_cachep, new);
return NULL;
}
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/dummy.c linux-2.6.17-rc5-mm1/security/dummy.c
--- linux-2.6.17-rc5-mm1.orig/security/dummy.c 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/dummy.c 2006-05-31 10:03:00.000000000 -0400
@@ -850,7 +850,7 @@ static int dummy_setprocattr(struct task
}
#ifdef CONFIG_KEYS
-static inline int dummy_key_alloc(struct key *key)
+static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx)
{
return 0;
}
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/keys/key.c linux-2.6.17-rc5-mm1/security/keys/key.c
--- linux-2.6.17-rc5-mm1.orig/security/keys/key.c 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/keys/key.c 2006-05-31 10:03:00.000000000 -0400
@@ -247,8 +247,8 @@ static inline void key_alloc_serial(stru
* instantiate the key or discard it before returning
*/
struct key *key_alloc(struct key_type *type, const char *desc,
- uid_t uid, gid_t gid, key_perm_t perm,
- int not_in_quota)
+ uid_t uid, gid_t gid, struct task_struct *ctx,
+ key_perm_t perm, int not_in_quota)
{
struct key_user *user = NULL;
struct key *key;
@@ -318,7 +318,7 @@ struct key *key_alloc(struct key_type *t
#endif
/* let the security module know about the key */
- ret = security_key_alloc(key);
+ ret = security_key_alloc(key, ctx);
if (ret < 0)
goto security_error;
@@ -822,7 +822,7 @@ key_ref_t key_create_or_update(key_ref_t
/* allocate a new key */
key = key_alloc(ktype, description, current->fsuid, current->fsgid,
- perm, not_in_quota);
+ current, perm, not_in_quota);
if (IS_ERR(key)) {
key_ref = ERR_PTR(PTR_ERR(key));
goto error_3;
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/keys/keyring.c linux-2.6.17-rc5-mm1/security/keys/keyring.c
--- linux-2.6.17-rc5-mm1.orig/security/keys/keyring.c 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/keys/keyring.c 2006-05-31 10:03:00.000000000 -0400
@@ -240,13 +240,14 @@ static long keyring_read(const struct ke
* allocate a keyring and link into the destination keyring
*/
struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
- int not_in_quota, struct key *dest)
+ struct task_struct *ctx, int not_in_quota,
+ struct key *dest)
{
struct key *keyring;
int ret;
keyring = key_alloc(&key_type_keyring, description,
- uid, gid,
+ uid, gid, ctx,
(KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
not_in_quota);
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/keys/process_keys.c linux-2.6.17-rc5-mm1/security/keys/process_keys.c
--- linux-2.6.17-rc5-mm1.orig/security/keys/process_keys.c 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/keys/process_keys.c 2006-05-31 10:03:00.000000000 -0400
@@ -67,7 +67,8 @@ struct key root_session_keyring = {
/*
* allocate the keyrings to be associated with a UID
*/
-int alloc_uid_keyring(struct user_struct *user)
+int alloc_uid_keyring(struct user_struct *user,
+ struct task_struct *ctx)
{
struct key *uid_keyring, *session_keyring;
char buf[20];
@@ -76,7 +77,7 @@ int alloc_uid_keyring(struct user_struct
/* concoct a default session keyring */
sprintf(buf, "_uid_ses.%u", user->uid);
- session_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, 0, NULL);
+ session_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx, 0, NULL);
if (IS_ERR(session_keyring)) {
ret = PTR_ERR(session_keyring);
goto error;
@@ -86,7 +87,7 @@ int alloc_uid_keyring(struct user_struct
* keyring */
sprintf(buf, "_uid.%u", user->uid);
- uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, 0,
+ uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx, 0,
session_keyring);
if (IS_ERR(uid_keyring)) {
key_put(session_keyring);
@@ -143,7 +144,7 @@ int install_thread_keyring(struct task_s
sprintf(buf, "_tid.%u", tsk->pid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, 1, NULL);
+ keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error;
@@ -177,7 +178,7 @@ int install_process_keyring(struct task_
if (!tsk->signal->process_keyring) {
sprintf(buf, "_pid.%u", tsk->tgid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, 1, NULL);
+ keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error;
@@ -217,7 +218,7 @@ static int install_session_keyring(struc
if (!keyring) {
sprintf(buf, "_ses.%u", tsk->tgid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, 1, NULL);
+ keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL);
if (IS_ERR(keyring))
return PTR_ERR(keyring);
}
@@ -727,7 +728,7 @@ long join_session_keyring(const char *na
keyring = find_keyring_by_name(name, 0);
if (PTR_ERR(keyring) == -ENOKEY) {
/* not found - try and create a new one */
- keyring = keyring_alloc(name, tsk->uid, tsk->gid, 0, NULL);
+ keyring = keyring_alloc(name, tsk->uid, tsk->gid, tsk, 0, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/keys/request_key_auth.c linux-2.6.17-rc5-mm1/security/keys/request_key_auth.c
--- linux-2.6.17-rc5-mm1.orig/security/keys/request_key_auth.c 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/keys/request_key_auth.c 2006-05-31 10:03:00.000000000 -0400
@@ -185,7 +185,7 @@ struct key *request_key_auth_new(struct
sprintf(desc, "%x", target->serial);
authkey = key_alloc(&key_type_request_key_auth, desc,
- current->fsuid, current->fsgid,
+ current->fsuid, current->fsgid, current,
KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
KEY_USR_VIEW, 1);
if (IS_ERR(authkey)) {
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/keys/request_key.c linux-2.6.17-rc5-mm1/security/keys/request_key.c
--- linux-2.6.17-rc5-mm1.orig/security/keys/request_key.c 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/keys/request_key.c 2006-05-31 10:03:00.000000000 -0400
@@ -48,7 +48,8 @@ static int call_sbin_request_key(struct
/* allocate a new session keyring */
sprintf(desc, "_req.%u", key->serial);
- keyring = keyring_alloc(desc, current->fsuid, current->fsgid, 1, NULL);
+ keyring = keyring_alloc(desc, current->fsuid, current->fsgid,
+ current, 1, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error_alloc;
@@ -137,7 +138,8 @@ static struct key *__request_key_constru
/* create a key and add it to the queue */
key = key_alloc(type, description,
- current->fsuid, current->fsgid, KEY_POS_ALL, 0);
+ current->fsuid, current->fsgid,
+ current, KEY_POS_ALL, 0);
if (IS_ERR(key))
goto alloc_failed;
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/selinux/hooks.c linux-2.6.17-rc5-mm1/security/selinux/hooks.c
--- linux-2.6.17-rc5-mm1.orig/security/selinux/hooks.c 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/selinux/hooks.c 2006-06-01 11:32:19.000000000 -0400
@@ -4252,6 +4252,57 @@ static int selinux_setprocattr(struct ta
return size;
}
+#ifdef CONFIG_KEYS
+
+static int selinux_key_alloc(struct key *k, struct task_struct *tsk)
+{
+ struct task_security_struct *tsec = tsk->security;
+ struct key_security_struct *ksec;
+
+ ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
+ if (!ksec)
+ return -ENOMEM;
+
+ ksec->obj = k;
+ ksec->sid = tsec->sid;
+ k->security = ksec;
+
+ return 0;
+}
+
+static void selinux_key_free(struct key *k)
+{
+ struct key_security_struct *ksec = k->security;
+
+ k->security = NULL;
+ kfree(ksec);
+}
+
+static int selinux_key_permission(key_ref_t key_ref,
+ struct task_struct *ctx,
+ key_perm_t perm)
+{
+ struct key *key;
+ struct task_security_struct *tsec;
+ struct key_security_struct *ksec;
+
+ key = key_ref_to_ptr(key_ref);
+
+ tsec = ctx->security;
+ ksec = key->security;
+
+ /* if no specific permissions are requested, we skip the
+ permission check. No serious, additional covert channels
+ appear to be created. */
+ if (perm == 0)
+ return 0;
+
+ return avc_has_perm(tsec->sid, ksec->sid,
+ SECCLASS_KEY, perm, NULL);
+}
+
+#endif
+
static struct security_operations selinux_ops = {
.ptrace = selinux_ptrace,
.capget = selinux_capget,
@@ -4404,6 +4455,12 @@ static struct security_operations selinu
.xfrm_state_free_security = selinux_xfrm_state_free,
.xfrm_policy_lookup = selinux_xfrm_policy_lookup,
#endif
+
+#ifdef CONFIG_KEYS
+ .key_alloc = selinux_key_alloc,
+ .key_free = selinux_key_free,
+ .key_permission = selinux_key_permission,
+#endif
};
static __init int selinux_init(void)
@@ -4439,6 +4496,13 @@ static __init int selinux_init(void)
} else {
printk(KERN_INFO "SELinux: Starting in permissive mode\n");
}
+
+#ifdef CONFIG_KEYS
+ /* Add security information to initial keyrings */
+ security_key_alloc(&root_user_keyring, current);
+ security_key_alloc(&root_session_keyring, current);
+#endif
+
return 0;
}
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/selinux/include/av_permissions.h linux-2.6.17-rc5-mm1/security/selinux/include/av_permissions.h
--- linux-2.6.17-rc5-mm1.orig/security/selinux/include/av_permissions.h 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/selinux/include/av_permissions.h 2006-06-01 10:42:18.000000000 -0400
@@ -959,3 +959,11 @@
#define PACKET__SEND 0x00000001UL
#define PACKET__RECV 0x00000002UL
#define PACKET__RELABELTO 0x00000004UL
+
+#define KEY__VIEW 0x00000001UL
+#define KEY__READ 0x00000002UL
+#define KEY__WRITE 0x00000004UL
+#define KEY__SEARCH 0x00000008UL
+#define KEY__LINK 0x00000010UL
+#define KEY__SETATTR 0x00000020UL
+
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/selinux/include/av_perm_to_string.h linux-2.6.17-rc5-mm1/security/selinux/include/av_perm_to_string.h
--- linux-2.6.17-rc5-mm1.orig/security/selinux/include/av_perm_to_string.h 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/selinux/include/av_perm_to_string.h 2006-06-01 10:42:18.000000000 -0400
@@ -242,3 +242,9 @@
S_(SECCLASS_PACKET, PACKET__SEND, "send")
S_(SECCLASS_PACKET, PACKET__RECV, "recv")
S_(SECCLASS_PACKET, PACKET__RELABELTO, "relabelto")
+ S_(SECCLASS_KEY, KEY__VIEW, "view")
+ S_(SECCLASS_KEY, KEY__READ, "read")
+ S_(SECCLASS_KEY, KEY__WRITE, "write")
+ S_(SECCLASS_KEY, KEY__SEARCH, "search")
+ S_(SECCLASS_KEY, KEY__LINK, "link")
+ S_(SECCLASS_KEY, KEY__SETATTR, "setattr")
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/selinux/include/class_to_string.h linux-2.6.17-rc5-mm1/security/selinux/include/class_to_string.h
--- linux-2.6.17-rc5-mm1.orig/security/selinux/include/class_to_string.h 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/selinux/include/class_to_string.h 2006-06-01 10:42:18.000000000 -0400
@@ -60,3 +60,4 @@
S_("netlink_kobject_uevent_socket")
S_("appletalk_socket")
S_("packet")
+ S_("key")
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/selinux/include/flask.h linux-2.6.17-rc5-mm1/security/selinux/include/flask.h
--- linux-2.6.17-rc5-mm1.orig/security/selinux/include/flask.h 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/selinux/include/flask.h 2006-06-01 10:42:18.000000000 -0400
@@ -62,6 +62,7 @@
#define SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET 55
#define SECCLASS_APPLETALK_SOCKET 56
#define SECCLASS_PACKET 57
+#define SECCLASS_KEY 58
/*
* Security identifier indices for initial entities
diff -uprN -X linux-2.6.17-rc5-mm1/Documentation/dontdiff linux-2.6.17-rc5-mm1.orig/security/selinux/include/objsec.h linux-2.6.17-rc5-mm1/security/selinux/include/objsec.h
--- linux-2.6.17-rc5-mm1.orig/security/selinux/include/objsec.h 2006-05-31 09:48:49.000000000 -0400
+++ linux-2.6.17-rc5-mm1/security/selinux/include/objsec.h 2006-05-31 10:03:00.000000000 -0400
@@ -99,6 +99,11 @@ struct sk_security_struct {
u32 peer_sid; /* SID of peer */
};
+struct key_security_struct {
+ struct key *obj; /* back pointer */
+ u32 sid; /* SID of key */
+};
+
extern unsigned int selinux_checkreqprot;
#endif /* _SELINUX_OBJSEC_H_ */
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