keys: Handle there being no fallback destination keyring for request_key()

[safe/jmp/linux-2.6] / security / keys / internal.h

diff --git a/security/keys/internal.h b/security/keys/internal.h
index 6361d37..9fb679c 100644 (file)
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -12,8 +12,8 @@
 #ifndef _INTERNAL_H
 #define _INTERNAL_H
 
+#include <linux/sched.h>
 #include <linux/key-type.h>
-#include <linux/key-ui.h>
 
 static inline __attribute__((format(printf, 1, 2)))
 void no_printk(const char *fmt, ...)
@@ -26,7 +26,7 @@ void no_printk(const char *fmt, ...)
 #define kleave(FMT, ...) \
        printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
 #define kdebug(FMT, ...) \
-       printk(KERN_DEBUG "xxx" FMT"yyy\n", ##__VA_ARGS__)
+       printk(KERN_DEBUG "   "FMT"\n", ##__VA_ARGS__)
 #else
 #define kenter(FMT, ...) \
        no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
@@ -53,31 +53,39 @@ struct key_user {
        atomic_t                nkeys;          /* number of keys */
        atomic_t                nikeys;         /* number of instantiated keys */
        uid_t                   uid;
+       struct user_namespace   *user_ns;
        int                     qnkeys;         /* number of keys allocated to this user */
        int                     qnbytes;        /* number of bytes allocated to this user */
 };
 
-#define KEYQUOTA_MAX_KEYS      100
-#define KEYQUOTA_MAX_BYTES     10000
-#define KEYQUOTA_LINK_BYTES    4               /* a link in a keyring is worth 4 bytes */
-
 extern struct rb_root  key_user_tree;
 extern spinlock_t      key_user_lock;
 extern struct key_user root_key_user;
 
-extern struct key_user *key_user_lookup(uid_t uid);
+extern struct key_user *key_user_lookup(uid_t uid,
+                                       struct user_namespace *user_ns);
 extern void key_user_put(struct key_user *user);
 
+/*
+ * key quota limits
+ * - root has its own separate limits to everyone else
+ */
+extern unsigned key_quota_root_maxkeys;
+extern unsigned key_quota_root_maxbytes;
+extern unsigned key_quota_maxkeys;
+extern unsigned key_quota_maxbytes;
+
+#define KEYQUOTA_LINK_BYTES    4               /* a link in a keyring is worth 4 bytes */
 
 
 extern struct rb_root key_serial_tree;
 extern spinlock_t key_serial_lock;
-extern struct semaphore key_alloc_sem;
 extern struct mutex key_construction_mutex;
 extern wait_queue_head_t request_key_conswq;
 
 
-extern void keyring_publish_name(struct key *keyring);
+extern struct key_type *key_type_lookup(const char *type);
+extern void key_type_put(struct key_type *ktype);
 
 extern int __key_link(struct key *keyring, struct key *key);
 
@@ -92,7 +100,7 @@ extern struct key *keyring_search_instkey(struct key *keyring,
 typedef int (*key_match_func_t)(const struct key *, const void *);
 
 extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
-                                   struct task_struct *tsk,
+                                   const struct cred *cred,
                                    struct key_type *type,
                                    const void *description,
                                    key_match_func_t match);
@@ -100,12 +108,13 @@ extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
 extern key_ref_t search_process_keyrings(struct key_type *type,
                                         const void *description,
                                         key_match_func_t match,
-                                        struct task_struct *tsk);
+                                        const struct cred *cred);
 
-extern struct key *find_keyring_by_name(const char *name, key_serial_t bound);
+extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
 
-extern int install_thread_keyring(struct task_struct *tsk);
-extern int install_process_keyring(struct task_struct *tsk);
+extern int install_user_keyrings(void);
+extern int install_thread_keyring_to_cred(struct cred *);
+extern int install_process_keyring_to_cred(struct cred *);
 
 extern struct key *request_key_and_link(struct key_type *type,
                                        const char *description,
@@ -115,12 +124,39 @@ extern struct key *request_key_and_link(struct key_type *type,
                                        struct key *dest_keyring,
                                        unsigned long flags);
 
+extern key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
+                                key_perm_t perm);
+
+extern long join_session_keyring(const char *name);
+
+/*
+ * check to see whether permission is granted to use a key in the desired way
+ */
+extern int key_task_permission(const key_ref_t key_ref,
+                              const struct cred *cred,
+                              key_perm_t perm);
+
+static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
+{
+       return key_task_permission(key_ref, current_cred(), perm);
+}
+
+/* required permissions */
+#define        KEY_VIEW        0x01    /* require permission to view attributes */
+#define        KEY_READ        0x02    /* require permission to read content */
+#define        KEY_WRITE       0x04    /* require permission to update / modify */
+#define        KEY_SEARCH      0x08    /* require permission to search (keyring) or find (key) */
+#define        KEY_LINK        0x10    /* require permission to link */
+#define        KEY_SETATTR     0x20    /* require permission to change attributes */
+#define        KEY_ALL         0x3f    /* all the above permissions */
+
 /*
  * request_key authorisation
  */
 struct request_key_auth {
        struct key              *target_key;
-       struct task_struct      *context;
+       struct key              *dest_keyring;
+       const struct cred       *cred;
        void                    *callout_info;
        size_t                  callout_len;
        pid_t                   pid;
@@ -129,7 +165,8 @@ struct request_key_auth {
 extern struct key_type key_type_request_key_auth;
 extern struct key *request_key_auth_new(struct key *target,
                                        const void *callout_info,
-                                       size_t callout_len);
+                                       size_t callout_len,
+                                       struct key *dest_keyring);
 
 extern struct key *key_get_instantiation_authkey(key_serial_t target_id);