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#ifndef _LINUX_KEY_H#define _LINUX_KEY_H
#include <linux/types.h>#include <linux/list.h>#include <linux/rbtree.h>#include <linux/rcupdate.h>#include <linux/sysctl.h>#include <linux/rwsem.h>#include <linux/atomic.h>#include <linux/assoc_array.h>#include <linux/refcount.h>#include <linux/time64.h>
#ifdef __KERNEL__#include <linux/uidgid.h>
/* key handle serial number */typedef int32_t key_serial_t;
/* key handle permissions mask */typedef uint32_t key_perm_t;
struct key;struct net;
#ifdef CONFIG_KEYS
#undef KEY_DEBUGGING
#define KEY_POS_VIEW 0x01000000 /* possessor can view a key's attributes */#define KEY_POS_READ 0x02000000 /* possessor can read key payload / view keyring */#define KEY_POS_WRITE 0x04000000 /* possessor can update key payload / add link to keyring */#define KEY_POS_SEARCH 0x08000000 /* possessor can find a key in search / search a keyring */#define KEY_POS_LINK 0x10000000 /* possessor can create a link to a key/keyring */#define KEY_POS_SETATTR 0x20000000 /* possessor can set key attributes */#define KEY_POS_ALL 0x3f000000
#define KEY_USR_VIEW 0x00010000 /* user permissions... */#define KEY_USR_READ 0x00020000#define KEY_USR_WRITE 0x00040000#define KEY_USR_SEARCH 0x00080000#define KEY_USR_LINK 0x00100000#define KEY_USR_SETATTR 0x00200000#define KEY_USR_ALL 0x003f0000
#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_SETATTR 0x00002000#define KEY_GRP_ALL 0x00003f00
#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_SETATTR 0x00000020#define KEY_OTH_ALL 0x0000003f
#define KEY_PERM_UNDEF 0xffffffff
/* * The permissions required on a key that we're looking up. */enum key_need_perm { KEY_NEED_UNSPECIFIED, /* Needed permission unspecified */ KEY_NEED_VIEW, /* Require permission to view attributes */ KEY_NEED_READ, /* Require permission to read content */ KEY_NEED_WRITE, /* Require permission to update / modify */ KEY_NEED_SEARCH, /* Require permission to search (keyring) or find (key) */ KEY_NEED_LINK, /* Require permission to link */ KEY_NEED_SETATTR, /* Require permission to change attributes */ KEY_NEED_UNLINK, /* Require permission to unlink key */ KEY_SYSADMIN_OVERRIDE, /* Special: override by CAP_SYS_ADMIN */ KEY_AUTHTOKEN_OVERRIDE, /* Special: override by possession of auth token */ KEY_DEFER_PERM_CHECK, /* Special: permission check is deferred */};
enum key_lookup_flag { KEY_LOOKUP_CREATE = 0x01, KEY_LOOKUP_PARTIAL = 0x02, KEY_LOOKUP_ALL = (KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL),};
struct seq_file;struct user_struct;struct signal_struct;struct cred;
struct key_type;struct key_owner;struct key_tag;struct keyring_list;struct keyring_name;
struct key_tag { struct rcu_head rcu; refcount_t usage; bool removed; /* T when subject removed */};
struct keyring_index_key { /* [!] If this structure is altered, the union in struct key must change too! */ unsigned long hash; /* Hash value */ union { struct {#ifdef __LITTLE_ENDIAN /* Put desc_len at the LSB of x */ u16 desc_len; char desc[sizeof(long) - 2]; /* First few chars of description */#else char desc[sizeof(long) - 2]; /* First few chars of description */ u16 desc_len;#endif }; unsigned long x; }; struct key_type *type; struct key_tag *domain_tag; /* Domain of operation */ const char *description;};
union key_payload { void __rcu *rcu_data0; void *data[4];};
/*****************************************************************************//* * key reference with possession attribute handling * * NOTE! key_ref_t is a typedef'd pointer to a type that is not actually * defined. This is because we abuse the bottom bit of the reference to carry a * flag to indicate whether the calling process possesses that key in one of * its keyrings. * * the key_ref_t has been made a separate type so that the compiler can reject * attempts to dereference it without proper conversion. * * the three functions are used to assemble and disassemble references */typedef struct __key_reference_with_attributes *key_ref_t;
static inline key_ref_t make_key_ref(const struct key *key, bool possession){ return (key_ref_t) ((unsigned long) key | possession);}
static inline struct key *key_ref_to_ptr(const key_ref_t key_ref){ return (struct key *) ((unsigned long) key_ref & ~1UL);}
static inline bool is_key_possessed(const key_ref_t key_ref){ return (unsigned long) key_ref & 1UL;}
typedef int (*key_restrict_link_func_t)(struct key *dest_keyring, const struct key_type *type, const union key_payload *payload, struct key *restriction_key);
struct key_restriction { key_restrict_link_func_t check; struct key *key; struct key_type *keytype;};
enum key_state { KEY_IS_UNINSTANTIATED, KEY_IS_POSITIVE, /* Positively instantiated */};
/*****************************************************************************//* * authentication token / access credential / keyring * - types of key include: * - keyrings * - disk encryption IDs * - Kerberos TGTs and tickets */struct key { refcount_t usage; /* number of references */ key_serial_t serial; /* key serial number */ union { struct list_head graveyard_link; struct rb_node serial_node; };#ifdef CONFIG_KEY_NOTIFICATIONS struct watch_list *watchers; /* Entities watching this key for changes */#endif struct rw_semaphore sem; /* change vs change sem */ struct key_user *user; /* owner of this key */ void *security; /* security data for this key */ union { time64_t expiry; /* time at which key expires (or 0) */ time64_t revoked_at; /* time at which key was revoked */ }; time64_t last_used_at; /* last time used for LRU keyring discard */ kuid_t uid; kgid_t gid; key_perm_t perm; /* access permissions */ unsigned short quotalen; /* length added to quota */ unsigned short datalen; /* payload data length * - may not match RCU dereferenced payload * - payload should contain own length */ short state; /* Key state (+) or rejection error (-) */
#ifdef KEY_DEBUGGING unsigned magic;#define KEY_DEBUG_MAGIC 0x18273645u#endif
unsigned long flags; /* status flags (change with bitops) */#define KEY_FLAG_DEAD 0 /* set if key type has been deleted */#define KEY_FLAG_REVOKED 1 /* set if key had been revoked */#define KEY_FLAG_IN_QUOTA 2 /* set if key consumes quota */#define KEY_FLAG_USER_CONSTRUCT 3 /* set if key is being constructed in userspace */#define KEY_FLAG_ROOT_CAN_CLEAR 4 /* set if key can be cleared by root without permission */#define KEY_FLAG_INVALIDATED 5 /* set if key has been invalidated */#define KEY_FLAG_BUILTIN 6 /* set if key is built in to the kernel */#define KEY_FLAG_ROOT_CAN_INVAL 7 /* set if key can be invalidated by root without permission */#define KEY_FLAG_KEEP 8 /* set if key should not be removed */#define KEY_FLAG_UID_KEYRING 9 /* set if key is a user or user session keyring */#define KEY_FLAG_USER_ALIVE 10 /* set if final put has not happened on key yet */
/* the key type and key description string * - the desc is used to match a key against search criteria * - it should be a printable string * - eg: for krb5 AFS, this might be "afs@REDHAT.COM" */ union { struct keyring_index_key index_key; struct { unsigned long hash; unsigned long len_desc; struct key_type *type; /* type of key */ struct key_tag *domain_tag; /* Domain of operation */ char *description; }; };
/* key data * - this is used to hold the data actually used in cryptography or * whatever */ union { union key_payload payload; struct { /* Keyring bits */ struct list_head name_link; struct assoc_array keys; }; };
/* This is set on a keyring to restrict the addition of a link to a key * to it. If this structure isn't provided then it is assumed that the * keyring is open to any addition. It is ignored for non-keyring * keys. Only set this value using keyring_restrict(), keyring_alloc(), * or key_alloc(). * * This is intended for use with rings of trusted keys whereby addition * to the keyring needs to be controlled. KEY_ALLOC_BYPASS_RESTRICTION * overrides this, allowing the kernel to add extra keys without * restriction. */ struct key_restriction *restrict_link;};
extern struct key *key_alloc(struct key_type *type, const char *desc, kuid_t uid, kgid_t gid, const struct cred *cred, key_perm_t perm, unsigned long flags, struct key_restriction *restrict_link);
#define KEY_ALLOC_IN_QUOTA 0x0000 /* add to quota, reject if would overrun */#define KEY_ALLOC_QUOTA_OVERRUN 0x0001 /* add to quota, permit even if overrun */#define KEY_ALLOC_NOT_IN_QUOTA 0x0002 /* not in quota */#define KEY_ALLOC_BUILT_IN 0x0004 /* Key is built into kernel */#define KEY_ALLOC_BYPASS_RESTRICTION 0x0008 /* Override the check on restricted keyrings */#define KEY_ALLOC_UID_KEYRING 0x0010 /* allocating a user or user session keyring */#define KEY_ALLOC_SET_KEEP 0x0020 /* Set the KEEP flag on the key/keyring */
extern void key_revoke(struct key *key);extern void key_invalidate(struct key *key);extern void key_put(struct key *key);extern bool key_put_tag(struct key_tag *tag);extern void key_remove_domain(struct key_tag *domain_tag);
static inline struct key *__key_get(struct key *key){ refcount_inc(&key->usage); return key;}
static inline struct key *key_get(struct key *key){ return key ? __key_get(key) : key;}
static inline void key_ref_put(key_ref_t key_ref){ key_put(key_ref_to_ptr(key_ref));}
extern struct key *request_key_tag(struct key_type *type, const char *description, struct key_tag *domain_tag, const char *callout_info);
extern struct key *request_key_rcu(struct key_type *type, const char *description, struct key_tag *domain_tag);
extern struct key *request_key_with_auxdata(struct key_type *type, const char *description, struct key_tag *domain_tag, const void *callout_info, size_t callout_len, void *aux);
/** * request_key - Request a key and wait for construction * @type: Type of key. * @description: The searchable description of the key. * @callout_info: The data to pass to the instantiation upcall (or NULL). * * As for request_key_tag(), but with the default global domain tag. */static inline struct key *request_key(struct key_type *type, const char *description, const char *callout_info){ return request_key_tag(type, description, NULL, callout_info);}
#ifdef CONFIG_NET/** * request_key_net - Request a key for a net namespace and wait for construction * @type: Type of key. * @description: The searchable description of the key. * @net: The network namespace that is the key's domain of operation. * @callout_info: The data to pass to the instantiation upcall (or NULL). * * As for request_key() except that it does not add the returned key to a * keyring if found, new keys are always allocated in the user's quota, the * callout_info must be a NUL-terminated string and no auxiliary data can be * passed. Only keys that operate the specified network namespace are used. * * Furthermore, it then works as wait_for_key_construction() to wait for the * completion of keys undergoing construction with a non-interruptible wait. */#define request_key_net(type, description, net, callout_info) \ request_key_tag(type, description, net->key_domain, callout_info)
/** * request_key_net_rcu - Request a key for a net namespace under RCU conditions * @type: Type of key. * @description: The searchable description of the key. * @net: The network namespace that is the key's domain of operation. * * As for request_key_rcu() except that only keys that operate the specified * network namespace are used. */#define request_key_net_rcu(type, description, net) \ request_key_rcu(type, description, net->key_domain)#endif /* CONFIG_NET */
extern int wait_for_key_construction(struct key *key, bool intr);
extern int key_validate(const struct key *key);
extern key_ref_t key_create(key_ref_t keyring, const char *type, const char *description, const void *payload, size_t plen, key_perm_t perm, unsigned long flags);
extern key_ref_t key_create_or_update(key_ref_t keyring, const char *type, const char *description, const void *payload, size_t plen, key_perm_t perm, unsigned long flags);
extern int key_update(key_ref_t key, const void *payload, size_t plen);
extern int key_link(struct key *keyring, struct key *key);
extern int key_move(struct key *key, struct key *from_keyring, struct key *to_keyring, unsigned int flags);
extern int key_unlink(struct key *keyring, struct key *key);
extern struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid, const struct cred *cred, key_perm_t perm, unsigned long flags, struct key_restriction *restrict_link, struct key *dest);
extern int restrict_link_reject(struct key *keyring, const struct key_type *type, const union key_payload *payload, struct key *restriction_key);
extern int keyring_clear(struct key *keyring);
extern key_ref_t keyring_search(key_ref_t keyring, struct key_type *type, const char *description, bool recurse);
extern int keyring_restrict(key_ref_t keyring, const char *type, const char *restriction);
extern struct key *key_lookup(key_serial_t id);
static inline key_serial_t key_serial(const struct key *key){ return key ? key->serial : 0;}
extern void key_set_timeout(struct key *, unsigned);
extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags, enum key_need_perm need_perm);extern void key_free_user_ns(struct user_namespace *);
static inline short key_read_state(const struct key *key){ /* Barrier versus mark_key_instantiated(). */ return smp_load_acquire(&key->state);}
/** * key_is_positive - Determine if a key has been positively instantiated * @key: The key to check. * * Return true if the specified key has been positively instantiated, false * otherwise. */static inline bool key_is_positive(const struct key *key){ return key_read_state(key) == KEY_IS_POSITIVE;}
static inline bool key_is_negative(const struct key *key){ return key_read_state(key) < 0;}
#define dereference_key_rcu(KEY) \ (rcu_dereference((KEY)->payload.rcu_data0))
#define dereference_key_locked(KEY) \ (rcu_dereference_protected((KEY)->payload.rcu_data0, \ rwsem_is_locked(&((struct key *)(KEY))->sem)))
#define rcu_assign_keypointer(KEY, PAYLOAD) \do { \ rcu_assign_pointer((KEY)->payload.rcu_data0, (PAYLOAD)); \} while (0)
/* * the userspace interface */extern int install_thread_keyring_to_cred(struct cred *cred);extern void key_fsuid_changed(struct cred *new_cred);extern void key_fsgid_changed(struct cred *new_cred);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_revoke(k) do { } while(0)#define key_invalidate(k) do { } while(0)#define key_put(k) do { } while(0)#define key_ref_put(k) do { } while(0)#define make_key_ref(k, p) NULL#define key_ref_to_ptr(k) NULL#define is_key_possessed(k) 0#define key_fsuid_changed(c) do { } while(0)#define key_fsgid_changed(c) do { } while(0)#define key_init() do { } while(0)#define key_free_user_ns(ns) do { } while(0)#define key_remove_domain(d) do { } while(0)#define key_lookup(k) NULL
#endif /* CONFIG_KEYS */#endif /* __KERNEL__ */#endif /* _LINUX_KEY_H */