Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 291 insertions, 0 deletions

diff --git a/include/linux/key.h b/include/linux/key.h
new file mode 100644
index 00000000000..6aa46d0e812
--- /dev/null
+++ b/include/linux/key.h
@@ -0,0 +1,291 @@
+/* key.h: authentication token and access key management
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ *
+ * See Documentation/keys.txt for information on keys/keyrings.
+ */
+
+#ifndef _LINUX_KEY_H
+#define _LINUX_KEY_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/rbtree.h>
+#include <linux/spinlock.h>
+#include <asm/atomic.h>
+
+#ifdef __KERNEL__
+
+/* key handle serial number */
+typedef int32_t key_serial_t;
+
+/* key handle permissions mask */
+typedef uint32_t key_perm_t;
+
+struct key;
+
+#ifdef CONFIG_KEYS
+
+#undef KEY_DEBUGGING
+
+#define KEY_USR_VIEW	0x00010000	/* user can view a key's attributes */
+#define KEY_USR_READ	0x00020000	/* user can read key payload / view keyring */
+#define KEY_USR_WRITE	0x00040000	/* user can update key payload / add link to keyring */
+#define KEY_USR_SEARCH	0x00080000	/* user can find a key in search / search a keyring */
+#define KEY_USR_LINK	0x00100000	/* user can create a link to a key/keyring */
+#define KEY_USR_ALL	0x001f0000
+
+#define KEY_GRP_VIEW	0x00000100	/* group permissions... */
+#define KEY_GRP_READ	0x00000200
+#define KEY_GRP_WRITE	0x00000400
+#define KEY_GRP_SEARCH	0x00000800
+#define KEY_GRP_LINK	0x00001000
+#define KEY_GRP_ALL	0x00001f00
+
+#define KEY_OTH_VIEW	0x00000001	/* third party permissions... */
+#define KEY_OTH_READ	0x00000002
+#define KEY_OTH_WRITE	0x00000004
+#define KEY_OTH_SEARCH	0x00000008
+#define KEY_OTH_LINK	0x00000010
+#define KEY_OTH_ALL	0x0000001f
+
+struct seq_file;
+struct user_struct;
+struct signal_struct;
+
+struct key_type;
+struct key_owner;
+struct keyring_list;
+struct keyring_name;
+
+/*****************************************************************************/
+/*
+ * authentication token / access credential / keyring
+ * - types of key include:
+ *   - keyrings
+ *   - disk encryption IDs
+ *   - Kerberos TGTs and tickets
+ */
+struct key {
+	atomic_t		usage;		/* number of references */
+	key_serial_t		serial;		/* key serial number */
+	struct rb_node		serial_node;
+	struct key_type		*type;		/* type of key */
+	rwlock_t		lock;		/* examination vs change lock */
+	struct rw_semaphore	sem;		/* change vs change sem */
+	struct key_user		*user;		/* owner of this key */
+	time_t			expiry;		/* time at which key expires (or 0) */
+	uid_t			uid;
+	gid_t			gid;
+	key_perm_t		perm;		/* access permissions */
+	unsigned short		quotalen;	/* length added to quota */
+	unsigned short		datalen;	/* payload data length */
+	unsigned short		flags;		/* status flags (change with lock writelocked) */
+#define KEY_FLAG_INSTANTIATED	0x00000001	/* set if key has been instantiated */
+#define KEY_FLAG_DEAD		0x00000002	/* set if key type has been deleted */
+#define KEY_FLAG_REVOKED	0x00000004	/* set if key had been revoked */
+#define KEY_FLAG_IN_QUOTA	0x00000008	/* set if key consumes quota */
+#define KEY_FLAG_USER_CONSTRUCT	0x00000010	/* set if key is being constructed in userspace */
+#define KEY_FLAG_NEGATIVE	0x00000020	/* set if key is negative */
+
+#ifdef KEY_DEBUGGING
+	unsigned		magic;
+#define KEY_DEBUG_MAGIC		0x18273645u
+#define KEY_DEBUG_MAGIC_X	0xf8e9dacbu
+#endif
+
+	/* the description string
+	 * - this is used to match a key against search criteria
+	 * - this should be a printable string
+	 * - eg: for krb5 AFS, this might be "afs@REDHAT.COM"
+	 */
+	char			*description;
+
+	/* type specific data
+	 * - this is used by the keyring type to index the name
+	 */
+	union {
+		struct list_head	link;
+	} type_data;
+
+	/* key data
+	 * - this is used to hold the data actually used in cryptography or
+	 *   whatever
+	 */
+	union {
+		unsigned long		value;
+		void			*data;
+		struct keyring_list	*subscriptions;
+	} payload;
+};
+
+/*****************************************************************************/
+/*
+ * kernel managed key type definition
+ */
+struct key_type {
+	/* name of the type */
+	const char *name;
+
+	/* default payload length for quota precalculation (optional)
+	 * - this can be used instead of calling key_payload_reserve(), that
+	 *   function only needs to be called if the real datalen is different
+	 */
+	size_t def_datalen;
+
+	/* instantiate a key of this type
+	 * - this method should call key_payload_reserve() to determine if the
+	 *   user's quota will hold the payload
+	 */
+	int (*instantiate)(struct key *key, const void *data, size_t datalen);
+
+	/* duplicate a key of this type (optional)
+	 * - the source key will be locked against change
+	 * - the new description will be attached
+	 * - the quota will have been adjusted automatically from
+	 *   source->quotalen
+	 */
+	int (*duplicate)(struct key *key, const struct key *source);
+
+	/* update a key of this type (optional)
+	 * - this method should call key_payload_reserve() to recalculate the
+	 *   quota consumption
+	 * - the key must be locked against read when modifying
+	 */
+	int (*update)(struct key *key, const void *data, size_t datalen);
+
+	/* match a key against a description */
+	int (*match)(const struct key *key, const void *desc);
+
+	/* clear the data from a key (optional) */
+	void (*destroy)(struct key *key);
+
+	/* describe a key */
+	void (*describe)(const struct key *key, struct seq_file *p);
+
+	/* read a key's data (optional)
+	 * - permission checks will be done by the caller
+	 * - the key's semaphore will be readlocked by the caller
+	 * - should return the amount of data that could be read, no matter how
+	 *   much is copied into the buffer
+	 * - shouldn't do the copy if the buffer is NULL
+	 */
+	long (*read)(const struct key *key, char __user *buffer, size_t buflen);
+
+	/* internal fields */
+	struct list_head	link;		/* link in types list */
+};
+
+extern struct key_type key_type_keyring;
+
+extern int register_key_type(struct key_type *ktype);
+extern void unregister_key_type(struct key_type *ktype);
+
+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);
+extern int key_payload_reserve(struct key *key, size_t datalen);
+extern int key_instantiate_and_link(struct key *key,
+				    const void *data,
+				    size_t datalen,
+				    struct key *keyring);
+extern int key_negate_and_link(struct key *key,
+			       unsigned timeout,
+			       struct key *keyring);
+extern void key_revoke(struct key *key);
+extern void key_put(struct key *key);
+
+static inline struct key *key_get(struct key *key)
+{
+	if (key)
+		atomic_inc(&key->usage);
+	return key;
+}
+
+extern struct key *request_key(struct key_type *type,
+			       const char *description,
+			       const char *callout_info);
+
+extern int key_validate(struct key *key);
+
+extern struct key *key_create_or_update(struct key *keyring,
+					const char *type,
+					const char *description,
+					const void *payload,
+					size_t plen,
+					int not_in_quota);
+
+extern int key_update(struct key *key,
+		      const void *payload,
+		      size_t plen);
+
+extern int key_link(struct key *keyring,
+		    struct key *key);
+
+extern int key_unlink(struct key *keyring,
+		      struct key *key);
+
+extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
+				 int not_in_quota, struct key *dest);
+
+extern int keyring_clear(struct key *keyring);
+
+extern struct key *keyring_search(struct key *keyring,
+				  struct key_type *type,
+				  const char *description);
+
+extern struct key *search_process_keyrings(struct key_type *type,
+					   const char *description);
+
+extern int keyring_add_key(struct key *keyring,
+			   struct key *key);
+
+extern struct key *key_lookup(key_serial_t id);
+
+#define key_serial(key) ((key) ? (key)->serial : 0)
+
+/*
+ * the userspace interface
+ */
+extern struct key root_user_keyring, root_session_keyring;
+extern int alloc_uid_keyring(struct user_struct *user);
+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);
+extern void exit_keys(struct task_struct *tsk);
+extern void exit_thread_group_keys(struct signal_struct *tg);
+extern int suid_keys(struct task_struct *tsk);
+extern int exec_keys(struct task_struct *tsk);
+extern void key_fsuid_changed(struct task_struct *tsk);
+extern void key_fsgid_changed(struct task_struct *tsk);
+extern void key_init(void);
+
+#else /* CONFIG_KEYS */
+
+#define key_validate(k)			0
+#define key_serial(k)			0
+#define key_get(k) 			NULL
+#define key_put(k)			do { } while(0)
+#define alloc_uid_keyring(u)		0
+#define switch_uid_keyring(u)		do { } while(0)
+#define copy_keys(f,t)			0
+#define copy_thread_group_keys(t)	0
+#define exit_keys(t)			do { } while(0)
+#define exit_thread_group_keys(tg)	do { } while(0)
+#define suid_keys(t)			do { } while(0)
+#define exec_keys(t)			do { } while(0)
+#define key_fsuid_changed(t)		do { } while(0)
+#define key_fsgid_changed(t)		do { } while(0)
+#define key_init()			do { } while(0)
+
+#endif /* CONFIG_KEYS */
+#endif /* __KERNEL__ */
+#endif /* _LINUX_KEY_H */