Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 309 insertions, 0 deletions

diff --git a/security/keys/internal.h b/security/keys/internal.h
new file mode 100644
index 000000000..d1b9c5957
--- /dev/null
+++ b/security/keys/internal.h
@@ -0,0 +1,309 @@
+/* Authentication token and access key management internal defs
+ *
+ * Copyright (C) 2003-5, 2007 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.
+ */
+
+#ifndef _INTERNAL_H
+#define _INTERNAL_H
+
+#include <linux/sched.h>
+#include <linux/wait_bit.h>
+#include <linux/cred.h>
+#include <linux/key-type.h>
+#include <linux/task_work.h>
+#include <linux/keyctl.h>
+#include <linux/refcount.h>
+#include <linux/compat.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+
+struct iovec;
+
+#ifdef __KDEBUG
+#define kenter(FMT, ...) \
+	printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) \
+	printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) \
+	printk(KERN_DEBUG "   "FMT"\n", ##__VA_ARGS__)
+#else
+#define kenter(FMT, ...) \
+	no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) \
+	no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) \
+	no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
+#endif
+
+extern struct key_type key_type_dead;
+extern struct key_type key_type_user;
+extern struct key_type key_type_logon;
+
+/*****************************************************************************/
+/*
+ * Keep track of keys for a user.
+ *
+ * This needs to be separate to user_struct to avoid a refcount-loop
+ * (user_struct pins some keyrings which pin this struct).
+ *
+ * We also keep track of keys under request from userspace for this UID here.
+ */
+struct key_user {
+	struct rb_node		node;
+	struct mutex		cons_lock;	/* construction initiation lock */
+	spinlock_t		lock;
+	refcount_t		usage;		/* for accessing qnkeys & qnbytes */
+	atomic_t		nkeys;		/* number of keys */
+	atomic_t		nikeys;		/* number of instantiated keys */
+	kuid_t			uid;
+	int			qnkeys;		/* number of keys allocated to this user */
+	int			qnbytes;	/* number of bytes allocated to this user */
+};
+
+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(kuid_t uid);
+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 kmem_cache *key_jar;
+extern struct rb_root key_serial_tree;
+extern spinlock_t key_serial_lock;
+extern struct mutex key_construction_mutex;
+extern wait_queue_head_t request_key_conswq;
+
+
+extern struct key_type *key_type_lookup(const char *type);
+extern void key_type_put(struct key_type *ktype);
+
+extern int __key_link_begin(struct key *keyring,
+			    const struct keyring_index_key *index_key,
+			    struct assoc_array_edit **_edit);
+extern int __key_link_check_live_key(struct key *keyring, struct key *key);
+extern void __key_link(struct key *key, struct assoc_array_edit **_edit);
+extern void __key_link_end(struct key *keyring,
+			   const struct keyring_index_key *index_key,
+			   struct assoc_array_edit *edit);
+
+extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
+				    const struct keyring_index_key *index_key);
+
+extern struct key *keyring_search_instkey(struct key *keyring,
+					  key_serial_t target_id);
+
+extern int iterate_over_keyring(const struct key *keyring,
+				int (*func)(const struct key *key, void *data),
+				void *data);
+
+struct keyring_search_context {
+	struct keyring_index_key index_key;
+	const struct cred	*cred;
+	struct key_match_data	match_data;
+	unsigned		flags;
+#define KEYRING_SEARCH_NO_STATE_CHECK	0x0001	/* Skip state checks */
+#define KEYRING_SEARCH_DO_STATE_CHECK	0x0002	/* Override NO_STATE_CHECK */
+#define KEYRING_SEARCH_NO_UPDATE_TIME	0x0004	/* Don't update times */
+#define KEYRING_SEARCH_NO_CHECK_PERM	0x0008	/* Don't check permissions */
+#define KEYRING_SEARCH_DETECT_TOO_DEEP	0x0010	/* Give an error on excessive depth */
+#define KEYRING_SEARCH_SKIP_EXPIRED	0x0020	/* Ignore expired keys (intention to replace) */
+
+	int (*iterator)(const void *object, void *iterator_data);
+
+	/* Internal stuff */
+	int			skipped_ret;
+	bool			possessed;
+	key_ref_t		result;
+	time64_t		now;
+};
+
+extern bool key_default_cmp(const struct key *key,
+			    const struct key_match_data *match_data);
+extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
+				    struct keyring_search_context *ctx);
+
+extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
+extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);
+
+extern struct key *find_keyring_by_name(const char *name, bool uid_keyring);
+
+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 int install_session_keyring_to_cred(struct cred *, struct key *);
+
+extern struct key *request_key_and_link(struct key_type *type,
+					const char *description,
+					const void *callout_info,
+					size_t callout_len,
+					void *aux,
+					struct key *dest_keyring,
+					unsigned long flags);
+
+extern bool lookup_user_key_possessed(const struct key *key,
+				      const struct key_match_data *match_data);
+extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
+				 key_perm_t perm);
+#define KEY_LOOKUP_CREATE	0x01
+#define KEY_LOOKUP_PARTIAL	0x02
+#define KEY_LOOKUP_FOR_UNLINK	0x04
+
+extern long join_session_keyring(const char *name);
+extern void key_change_session_keyring(struct callback_head *twork);
+
+extern struct work_struct key_gc_work;
+extern unsigned key_gc_delay;
+extern void keyring_gc(struct key *keyring, time64_t limit);
+extern void keyring_restriction_gc(struct key *keyring,
+				   struct key_type *dead_type);
+extern void key_schedule_gc(time64_t gc_at);
+extern void key_schedule_gc_links(void);
+extern void key_gc_keytype(struct key_type *ktype);
+
+extern int key_task_permission(const key_ref_t key_ref,
+			       const struct cred *cred,
+			       key_perm_t perm);
+
+/*
+ * Check to see whether permission is granted to use a key in the desired way.
+ */
+static inline int key_permission(const key_ref_t key_ref, unsigned perm)
+{
+	return key_task_permission(key_ref, current_cred(), perm);
+}
+
+extern struct key_type key_type_request_key_auth;
+extern struct key *request_key_auth_new(struct key *target,
+					const char *op,
+					const void *callout_info,
+					size_t callout_len,
+					struct key *dest_keyring);
+
+extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
+
+/*
+ * Determine whether a key is dead.
+ */
+static inline bool key_is_dead(const struct key *key, time64_t limit)
+{
+	return
+		key->flags & ((1 << KEY_FLAG_DEAD) |
+			      (1 << KEY_FLAG_INVALIDATED)) ||
+		(key->expiry > 0 && key->expiry <= limit);
+}
+
+/*
+ * keyctl() functions
+ */
+extern long keyctl_get_keyring_ID(key_serial_t, int);
+extern long keyctl_join_session_keyring(const char __user *);
+extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
+extern long keyctl_revoke_key(key_serial_t);
+extern long keyctl_keyring_clear(key_serial_t);
+extern long keyctl_keyring_link(key_serial_t, key_serial_t);
+extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
+extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
+extern long keyctl_keyring_search(key_serial_t, const char __user *,
+				  const char __user *, key_serial_t);
+extern long keyctl_read_key(key_serial_t, char __user *, size_t);
+extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
+extern long keyctl_setperm_key(key_serial_t, key_perm_t);
+extern long keyctl_instantiate_key(key_serial_t, const void __user *,
+				   size_t, key_serial_t);
+extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
+extern long keyctl_set_reqkey_keyring(int);
+extern long keyctl_set_timeout(key_serial_t, unsigned);
+extern long keyctl_assume_authority(key_serial_t);
+extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
+				size_t buflen);
+extern long keyctl_session_to_parent(void);
+extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
+extern long keyctl_instantiate_key_iov(key_serial_t,
+				       const struct iovec __user *,
+				       unsigned, key_serial_t);
+extern long keyctl_invalidate_key(key_serial_t);
+
+struct iov_iter;
+extern long keyctl_instantiate_key_common(key_serial_t,
+					  struct iov_iter *,
+					  key_serial_t);
+extern long keyctl_restrict_keyring(key_serial_t id,
+				    const char __user *_type,
+				    const char __user *_restriction);
+#ifdef CONFIG_PERSISTENT_KEYRINGS
+extern long keyctl_get_persistent(uid_t, key_serial_t);
+extern unsigned persistent_keyring_expiry;
+#else
+static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
+#ifdef CONFIG_KEY_DH_OPERATIONS
+extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
+			      size_t, struct keyctl_kdf_params __user *);
+extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
+				size_t, struct keyctl_kdf_params *);
+#ifdef CONFIG_KEYS_COMPAT
+extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
+				char __user *buffer, size_t buflen,
+				struct compat_keyctl_kdf_params __user *kdf);
+#endif
+#define KEYCTL_KDF_MAX_OUTPUT_LEN	1024	/* max length of KDF output */
+#define KEYCTL_KDF_MAX_OI_LEN		64	/* max length of otherinfo */
+#else
+static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
+				     char __user *buffer, size_t buflen,
+				     struct keyctl_kdf_params __user *kdf)
+{
+	return -EOPNOTSUPP;
+}
+
+#ifdef CONFIG_KEYS_COMPAT
+static inline long compat_keyctl_dh_compute(
+				struct keyctl_dh_params __user *params,
+				char __user *buffer, size_t buflen,
+				struct keyctl_kdf_params __user *kdf)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+#endif
+
+/*
+ * Debugging key validation
+ */
+#ifdef KEY_DEBUGGING
+extern void __key_check(const struct key *);
+
+static inline void key_check(const struct key *key)
+{
+	if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
+		__key_check(key);
+}
+
+#else
+
+#define key_check(key) do {} while(0)
+
+#endif
+#endif /* _INTERNAL_H */