2007-10-17 06:29:46 +00:00
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/* Authentication token and access key management
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2005-04-16 22:20:36 +00:00
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*
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2007-10-17 06:29:46 +00:00
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* Copyright (C) 2004, 2007 Red Hat, Inc. All Rights Reserved.
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2005-04-16 22:20:36 +00:00
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*
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* See Documentation/keys.txt for information on keys/keyrings.
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*/
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#ifndef _LINUX_KEY_H
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#define _LINUX_KEY_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/rbtree.h>
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2005-06-24 05:00:49 +00:00
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#include <linux/rcupdate.h>
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2008-04-29 08:01:32 +00:00
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#include <linux/sysctl.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/atomic.h>
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#ifdef __KERNEL__
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/* key handle serial number */
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typedef int32_t key_serial_t;
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/* key handle permissions mask */
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typedef uint32_t key_perm_t;
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struct key;
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#ifdef CONFIG_KEYS
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#undef KEY_DEBUGGING
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2005-09-28 16:03:15 +00:00
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#define KEY_POS_VIEW 0x01000000 /* possessor can view a key's attributes */
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#define KEY_POS_READ 0x02000000 /* possessor can read key payload / view keyring */
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#define KEY_POS_WRITE 0x04000000 /* possessor can update key payload / add link to keyring */
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#define KEY_POS_SEARCH 0x08000000 /* possessor can find a key in search / search a keyring */
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#define KEY_POS_LINK 0x10000000 /* possessor can create a link to a key/keyring */
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2005-10-30 23:02:44 +00:00
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#define KEY_POS_SETATTR 0x20000000 /* possessor can set key attributes */
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#define KEY_POS_ALL 0x3f000000
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2005-09-28 16:03:15 +00:00
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#define KEY_USR_VIEW 0x00010000 /* user permissions... */
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#define KEY_USR_READ 0x00020000
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#define KEY_USR_WRITE 0x00040000
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#define KEY_USR_SEARCH 0x00080000
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#define KEY_USR_LINK 0x00100000
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2005-10-30 23:02:44 +00:00
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#define KEY_USR_SETATTR 0x00200000
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#define KEY_USR_ALL 0x003f0000
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2005-04-16 22:20:36 +00:00
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#define KEY_GRP_VIEW 0x00000100 /* group permissions... */
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#define KEY_GRP_READ 0x00000200
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#define KEY_GRP_WRITE 0x00000400
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#define KEY_GRP_SEARCH 0x00000800
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#define KEY_GRP_LINK 0x00001000
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2005-10-30 23:02:44 +00:00
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#define KEY_GRP_SETATTR 0x00002000
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#define KEY_GRP_ALL 0x00003f00
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2005-04-16 22:20:36 +00:00
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#define KEY_OTH_VIEW 0x00000001 /* third party permissions... */
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#define KEY_OTH_READ 0x00000002
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#define KEY_OTH_WRITE 0x00000004
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#define KEY_OTH_SEARCH 0x00000008
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#define KEY_OTH_LINK 0x00000010
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2005-10-30 23:02:44 +00:00
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#define KEY_OTH_SETATTR 0x00000020
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#define KEY_OTH_ALL 0x0000003f
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2005-04-16 22:20:36 +00:00
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2008-04-29 08:01:28 +00:00
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#define KEY_PERM_UNDEF 0xffffffff
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2005-04-16 22:20:36 +00:00
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struct seq_file;
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struct user_struct;
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struct signal_struct;
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struct key_type;
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struct key_owner;
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struct keyring_list;
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struct keyring_name;
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2005-09-28 16:03:15 +00:00
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/*****************************************************************************/
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/*
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* key reference with possession attribute handling
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*
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* NOTE! key_ref_t is a typedef'd pointer to a type that is not actually
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* defined. This is because we abuse the bottom bit of the reference to carry a
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* flag to indicate whether the calling process possesses that key in one of
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* its keyrings.
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*
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* the key_ref_t has been made a separate type so that the compiler can reject
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* attempts to dereference it without proper conversion.
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*
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* the three functions are used to assemble and disassemble references
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*/
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typedef struct __key_reference_with_attributes *key_ref_t;
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static inline key_ref_t make_key_ref(const struct key *key,
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unsigned long possession)
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{
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return (key_ref_t) ((unsigned long) key | possession);
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}
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static inline struct key *key_ref_to_ptr(const key_ref_t key_ref)
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{
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return (struct key *) ((unsigned long) key_ref & ~1UL);
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}
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static inline unsigned long is_key_possessed(const key_ref_t key_ref)
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{
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return (unsigned long) key_ref & 1UL;
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}
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2005-04-16 22:20:36 +00:00
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/*****************************************************************************/
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/*
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* authentication token / access credential / keyring
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* - types of key include:
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* - keyrings
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* - disk encryption IDs
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* - Kerberos TGTs and tickets
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*/
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struct key {
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atomic_t usage; /* number of references */
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key_serial_t serial; /* key serial number */
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struct rb_node serial_node;
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struct key_type *type; /* type of key */
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struct rw_semaphore sem; /* change vs change sem */
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struct key_user *user; /* owner of this key */
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2005-10-30 23:02:44 +00:00
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void *security; /* security data for this key */
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2005-04-16 22:20:36 +00:00
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time_t expiry; /* time at which key expires (or 0) */
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uid_t uid;
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gid_t gid;
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key_perm_t perm; /* access permissions */
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unsigned short quotalen; /* length added to quota */
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2005-06-24 05:00:49 +00:00
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unsigned short datalen; /* payload data length
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* - may not match RCU dereferenced payload
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* - payload should contain own length
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*/
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2005-04-16 22:20:36 +00:00
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#ifdef KEY_DEBUGGING
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unsigned magic;
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#define KEY_DEBUG_MAGIC 0x18273645u
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#define KEY_DEBUG_MAGIC_X 0xf8e9dacbu
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#endif
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2005-06-24 05:00:49 +00:00
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unsigned long flags; /* status flags (change with bitops) */
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#define KEY_FLAG_INSTANTIATED 0 /* set if key has been instantiated */
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#define KEY_FLAG_DEAD 1 /* set if key type has been deleted */
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#define KEY_FLAG_REVOKED 2 /* set if key had been revoked */
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#define KEY_FLAG_IN_QUOTA 3 /* set if key consumes quota */
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#define KEY_FLAG_USER_CONSTRUCT 4 /* set if key is being constructed in userspace */
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#define KEY_FLAG_NEGATIVE 5 /* set if key is negative */
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2005-04-16 22:20:36 +00:00
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/* the description string
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* - this is used to match a key against search criteria
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* - this should be a printable string
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* - eg: for krb5 AFS, this might be "afs@REDHAT.COM"
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*/
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char *description;
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/* type specific data
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* - this is used by the keyring type to index the name
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*/
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union {
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struct list_head link;
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2007-04-26 22:46:23 +00:00
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unsigned long x[2];
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void *p[2];
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2005-04-16 22:20:36 +00:00
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} type_data;
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/* key data
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* - this is used to hold the data actually used in cryptography or
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* whatever
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*/
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union {
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unsigned long value;
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void *data;
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struct keyring_list *subscriptions;
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} payload;
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};
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extern struct key *key_alloc(struct key_type *type,
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const char *desc,
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2006-06-22 21:47:17 +00:00
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uid_t uid, gid_t gid,
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struct task_struct *ctx,
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2006-06-26 07:24:50 +00:00
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key_perm_t perm,
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unsigned long flags);
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#define KEY_ALLOC_IN_QUOTA 0x0000 /* add to quota, reject if would overrun */
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#define KEY_ALLOC_QUOTA_OVERRUN 0x0001 /* add to quota, permit even if overrun */
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#define KEY_ALLOC_NOT_IN_QUOTA 0x0002 /* not in quota */
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2005-04-16 22:20:36 +00:00
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extern void key_revoke(struct key *key);
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extern void key_put(struct key *key);
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static inline struct key *key_get(struct key *key)
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{
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if (key)
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atomic_inc(&key->usage);
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return key;
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}
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2005-09-28 16:03:15 +00:00
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static inline void key_ref_put(key_ref_t key_ref)
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{
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key_put(key_ref_to_ptr(key_ref));
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}
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2005-04-16 22:20:36 +00:00
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extern struct key *request_key(struct key_type *type,
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const char *description,
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const char *callout_info);
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2006-06-29 09:24:28 +00:00
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extern struct key *request_key_with_auxdata(struct key_type *type,
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const char *description,
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2008-04-29 08:01:24 +00:00
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const void *callout_info,
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size_t callout_len,
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2006-06-29 09:24:28 +00:00
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void *aux);
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2007-10-17 06:29:46 +00:00
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extern struct key *request_key_async(struct key_type *type,
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const char *description,
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2008-04-29 08:01:24 +00:00
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const void *callout_info,
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size_t callout_len);
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2007-10-17 06:29:46 +00:00
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extern struct key *request_key_async_with_auxdata(struct key_type *type,
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const char *description,
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2008-04-29 08:01:24 +00:00
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const void *callout_info,
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size_t callout_len,
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2007-10-17 06:29:46 +00:00
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void *aux);
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extern int wait_for_key_construction(struct key *key, bool intr);
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2005-04-16 22:20:36 +00:00
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extern int key_validate(struct key *key);
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2005-09-28 16:03:15 +00:00
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extern key_ref_t key_create_or_update(key_ref_t keyring,
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const char *type,
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const char *description,
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const void *payload,
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size_t plen,
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2008-04-29 08:01:28 +00:00
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key_perm_t perm,
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2006-06-26 07:24:50 +00:00
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unsigned long flags);
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2005-04-16 22:20:36 +00:00
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2005-09-28 16:03:15 +00:00
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extern int key_update(key_ref_t key,
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2005-04-16 22:20:36 +00:00
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const void *payload,
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size_t plen);
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extern int key_link(struct key *keyring,
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struct key *key);
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extern int key_unlink(struct key *keyring,
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struct key *key);
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extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
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2006-06-22 21:47:17 +00:00
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struct task_struct *ctx,
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2006-06-26 07:24:50 +00:00
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unsigned long flags,
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2006-06-22 21:47:17 +00:00
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struct key *dest);
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2005-04-16 22:20:36 +00:00
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extern int keyring_clear(struct key *keyring);
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2005-09-28 16:03:15 +00:00
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extern key_ref_t keyring_search(key_ref_t keyring,
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struct key_type *type,
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const char *description);
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2005-04-16 22:20:36 +00:00
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extern int keyring_add_key(struct key *keyring,
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struct key *key);
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extern struct key *key_lookup(key_serial_t id);
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2008-04-29 08:01:34 +00:00
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static inline key_serial_t key_serial(struct key *key)
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{
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return key ? key->serial : 0;
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}
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2005-04-16 22:20:36 +00:00
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2008-04-29 08:01:32 +00:00
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#ifdef CONFIG_SYSCTL
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extern ctl_table key_sysctls[];
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#endif
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2005-04-16 22:20:36 +00:00
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/*
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* the userspace interface
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*/
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extern void switch_uid_keyring(struct user_struct *new_user);
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extern int copy_keys(unsigned long clone_flags, struct task_struct *tsk);
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extern int copy_thread_group_keys(struct task_struct *tsk);
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extern void exit_keys(struct task_struct *tsk);
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extern void exit_thread_group_keys(struct signal_struct *tg);
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extern int suid_keys(struct task_struct *tsk);
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extern int exec_keys(struct task_struct *tsk);
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extern void key_fsuid_changed(struct task_struct *tsk);
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extern void key_fsgid_changed(struct task_struct *tsk);
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extern void key_init(void);
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KEYS: Alter use of key instantiation link-to-keyring argument
Alter the use of the key instantiation and negation functions' link-to-keyring
arguments. Currently this specifies a keyring in the target process to link
the key into, creating the keyring if it doesn't exist. This, however, can be
a problem for copy-on-write credentials as it means that the instantiating
process can alter the credentials of the requesting process.
This patch alters the behaviour such that:
(1) If keyctl_instantiate_key() or keyctl_negate_key() are given a specific
keyring by ID (ringid >= 0), then that keyring will be used.
(2) If keyctl_instantiate_key() or keyctl_negate_key() are given one of the
special constants that refer to the requesting process's keyrings
(KEY_SPEC_*_KEYRING, all <= 0), then:
(a) If sys_request_key() was given a keyring to use (destringid) then the
key will be attached to that keyring.
(b) If sys_request_key() was given a NULL keyring, then the key being
instantiated will be attached to the default keyring as set by
keyctl_set_reqkey_keyring().
(3) No extra link will be made.
Decision point (1) follows current behaviour, and allows those instantiators
who've searched for a specifically named keyring in the requestor's keyring so
as to partition the keys by type to still have their named keyrings.
Decision point (2) allows the requestor to make sure that the key or keys that
get produced by request_key() go where they want, whilst allowing the
instantiator to request that the key is retained. This is mainly useful for
situations where the instantiator makes a secondary request, the key for which
should be retained by the initial requestor:
+-----------+ +--------------+ +--------------+
| | | | | |
| Requestor |------->| Instantiator |------->| Instantiator |
| | | | | |
+-----------+ +--------------+ +--------------+
request_key() request_key()
This might be useful, for example, in Kerberos, where the requestor requests a
ticket, and then the ticket instantiator requests the TGT, which someone else
then has to go and fetch. The TGT, however, should be retained in the
keyrings of the requestor, not the first instantiator. To make this explict
an extra special keyring constant is also added.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>
2008-11-13 23:39:14 +00:00
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#define __install_session_keyring(keyring) \
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({ \
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struct key *old_session = current->signal->session_keyring; \
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current->signal->session_keyring = keyring; \
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old_session; \
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2005-06-24 05:00:51 +00:00
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})
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2005-04-16 22:20:36 +00:00
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#else /* CONFIG_KEYS */
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#define key_validate(k) 0
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#define key_serial(k) 0
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2005-06-24 05:00:51 +00:00
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#define key_get(k) ({ NULL; })
|
2008-10-12 04:10:50 +00:00
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#define key_revoke(k) do { } while(0)
|
2005-04-16 22:20:36 +00:00
|
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#define key_put(k) do { } while(0)
|
2005-09-28 16:03:15 +00:00
|
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#define key_ref_put(k) do { } while(0)
|
KEYS: Alter use of key instantiation link-to-keyring argument
Alter the use of the key instantiation and negation functions' link-to-keyring
arguments. Currently this specifies a keyring in the target process to link
the key into, creating the keyring if it doesn't exist. This, however, can be
a problem for copy-on-write credentials as it means that the instantiating
process can alter the credentials of the requesting process.
This patch alters the behaviour such that:
(1) If keyctl_instantiate_key() or keyctl_negate_key() are given a specific
keyring by ID (ringid >= 0), then that keyring will be used.
(2) If keyctl_instantiate_key() or keyctl_negate_key() are given one of the
special constants that refer to the requesting process's keyrings
(KEY_SPEC_*_KEYRING, all <= 0), then:
(a) If sys_request_key() was given a keyring to use (destringid) then the
key will be attached to that keyring.
(b) If sys_request_key() was given a NULL keyring, then the key being
instantiated will be attached to the default keyring as set by
keyctl_set_reqkey_keyring().
(3) No extra link will be made.
Decision point (1) follows current behaviour, and allows those instantiators
who've searched for a specifically named keyring in the requestor's keyring so
as to partition the keys by type to still have their named keyrings.
Decision point (2) allows the requestor to make sure that the key or keys that
get produced by request_key() go where they want, whilst allowing the
instantiator to request that the key is retained. This is mainly useful for
situations where the instantiator makes a secondary request, the key for which
should be retained by the initial requestor:
+-----------+ +--------------+ +--------------+
| | | | | |
| Requestor |------->| Instantiator |------->| Instantiator |
| | | | | |
+-----------+ +--------------+ +--------------+
request_key() request_key()
This might be useful, for example, in Kerberos, where the requestor requests a
ticket, and then the ticket instantiator requests the TGT, which someone else
then has to go and fetch. The TGT, however, should be retained in the
keyrings of the requestor, not the first instantiator. To make this explict
an extra special keyring constant is also added.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>
2008-11-13 23:39:14 +00:00
|
|
|
#define make_key_ref(k, p) NULL
|
|
|
|
#define key_ref_to_ptr(k) NULL
|
2005-09-28 16:03:15 +00:00
|
|
|
#define is_key_possessed(k) 0
|
2005-04-16 22:20:36 +00:00
|
|
|
#define switch_uid_keyring(u) do { } while(0)
|
KEYS: Alter use of key instantiation link-to-keyring argument
Alter the use of the key instantiation and negation functions' link-to-keyring
arguments. Currently this specifies a keyring in the target process to link
the key into, creating the keyring if it doesn't exist. This, however, can be
a problem for copy-on-write credentials as it means that the instantiating
process can alter the credentials of the requesting process.
This patch alters the behaviour such that:
(1) If keyctl_instantiate_key() or keyctl_negate_key() are given a specific
keyring by ID (ringid >= 0), then that keyring will be used.
(2) If keyctl_instantiate_key() or keyctl_negate_key() are given one of the
special constants that refer to the requesting process's keyrings
(KEY_SPEC_*_KEYRING, all <= 0), then:
(a) If sys_request_key() was given a keyring to use (destringid) then the
key will be attached to that keyring.
(b) If sys_request_key() was given a NULL keyring, then the key being
instantiated will be attached to the default keyring as set by
keyctl_set_reqkey_keyring().
(3) No extra link will be made.
Decision point (1) follows current behaviour, and allows those instantiators
who've searched for a specifically named keyring in the requestor's keyring so
as to partition the keys by type to still have their named keyrings.
Decision point (2) allows the requestor to make sure that the key or keys that
get produced by request_key() go where they want, whilst allowing the
instantiator to request that the key is retained. This is mainly useful for
situations where the instantiator makes a secondary request, the key for which
should be retained by the initial requestor:
+-----------+ +--------------+ +--------------+
| | | | | |
| Requestor |------->| Instantiator |------->| Instantiator |
| | | | | |
+-----------+ +--------------+ +--------------+
request_key() request_key()
This might be useful, for example, in Kerberos, where the requestor requests a
ticket, and then the ticket instantiator requests the TGT, which someone else
then has to go and fetch. The TGT, however, should be retained in the
keyrings of the requestor, not the first instantiator. To make this explict
an extra special keyring constant is also added.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>
2008-11-13 23:39:14 +00:00
|
|
|
#define __install_session_keyring(k) ({ NULL; })
|
2005-04-16 22:20:36 +00:00
|
|
|
#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 */
|