[PATCH] selinux: add hooks for key subsystem

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.

Has passed David's testsuite.

Signed-off-by: Michael LeMay <mdlemay@epoch.ncsc.mil>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 20 insertions, 16 deletions

diff --git a/security/keys/key.c b/security/keys/key.c
index 3fdc49c6a02c..14a15abb7735 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -247,8 +247,8 @@ static inline void key_alloc_serial(struct key *key)
  *   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 *type, const char *desc,
 #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 keyring_ref,
 
         /* 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 --git a/security/keys/keyring.c b/security/keys/keyring.c
index bffa924c1f88..1357207fc9df 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -240,13 +240,14 @@ static long keyring_read(const struct key *keyring,
  * 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 --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 217a0bef3c82..a50a91332fe1 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -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 *user)
         /* 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 *user)
          * 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_struct *tsk)
 
         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_struct *tsk)
         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(struct task_struct *tsk,
         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);
         }
@@ -717,7 +718,7 @@ long join_session_keyring(const char *name)
         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 --git a/security/keys/request_key.c b/security/keys/request_key.c
index f030a0ccbb93..eab66a06ca53 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -48,7 +48,8 @@ static int call_sbin_request_key(struct key *key,
         /* 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_construction(struct key_type *type,
 
         /* 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 --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index cce6ba6b0323..0ecc2e8d2bd0 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -148,7 +148,7 @@ struct key *request_key_auth_new(struct key *target, const char *callout_info)
         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)) {