1 /* Authentication token and access key management internal defs 2 * 3 * Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #ifndef _INTERNAL_H 13 #define _INTERNAL_H 14 15 #include <linux/sched.h> 16 #include <linux/key-type.h> 17 #include <linux/task_work.h> 18 #include <linux/keyctl.h> 19 20 struct iovec; 21 22 #ifdef __KDEBUG 23 #define kenter(FMT, ...) \ 24 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__) 25 #define kleave(FMT, ...) \ 26 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__) 27 #define kdebug(FMT, ...) \ 28 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__) 29 #else 30 #define kenter(FMT, ...) \ 31 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__) 32 #define kleave(FMT, ...) \ 33 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__) 34 #define kdebug(FMT, ...) \ 35 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__) 36 #endif 37 38 extern struct key_type key_type_dead; 39 extern struct key_type key_type_user; 40 extern struct key_type key_type_logon; 41 42 /*****************************************************************************/ 43 /* 44 * Keep track of keys for a user. 45 * 46 * This needs to be separate to user_struct to avoid a refcount-loop 47 * (user_struct pins some keyrings which pin this struct). 48 * 49 * We also keep track of keys under request from userspace for this UID here. 50 */ 51 struct key_user { 52 struct rb_node node; 53 struct mutex cons_lock; /* construction initiation lock */ 54 spinlock_t lock; 55 atomic_t usage; /* for accessing qnkeys & qnbytes */ 56 atomic_t nkeys; /* number of keys */ 57 atomic_t nikeys; /* number of instantiated keys */ 58 kuid_t uid; 59 int qnkeys; /* number of keys allocated to this user */ 60 int qnbytes; /* number of bytes allocated to this user */ 61 }; 62 63 extern struct rb_root key_user_tree; 64 extern spinlock_t key_user_lock; 65 extern struct key_user root_key_user; 66 67 extern struct key_user *key_user_lookup(kuid_t uid); 68 extern void key_user_put(struct key_user *user); 69 70 /* 71 * Key quota limits. 72 * - root has its own separate limits to everyone else 73 */ 74 extern unsigned key_quota_root_maxkeys; 75 extern unsigned key_quota_root_maxbytes; 76 extern unsigned key_quota_maxkeys; 77 extern unsigned key_quota_maxbytes; 78 79 #define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */ 80 81 82 extern struct kmem_cache *key_jar; 83 extern struct rb_root key_serial_tree; 84 extern spinlock_t key_serial_lock; 85 extern struct mutex key_construction_mutex; 86 extern wait_queue_head_t request_key_conswq; 87 88 89 extern struct key_type *key_type_lookup(const char *type); 90 extern void key_type_put(struct key_type *ktype); 91 92 extern int __key_link_begin(struct key *keyring, 93 const struct keyring_index_key *index_key, 94 struct assoc_array_edit **_edit); 95 extern int __key_link_check_live_key(struct key *keyring, struct key *key); 96 extern void __key_link(struct key *key, struct assoc_array_edit **_edit); 97 extern void __key_link_end(struct key *keyring, 98 const struct keyring_index_key *index_key, 99 struct assoc_array_edit *edit); 100 101 extern key_ref_t find_key_to_update(key_ref_t keyring_ref, 102 const struct keyring_index_key *index_key); 103 104 extern struct key *keyring_search_instkey(struct key *keyring, 105 key_serial_t target_id); 106 107 extern int iterate_over_keyring(const struct key *keyring, 108 int (*func)(const struct key *key, void *data), 109 void *data); 110 111 struct keyring_search_context { 112 struct keyring_index_key index_key; 113 const struct cred *cred; 114 struct key_match_data match_data; 115 unsigned flags; 116 #define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */ 117 #define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */ 118 #define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */ 119 #define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */ 120 #define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */ 121 #define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */ 122 123 int (*iterator)(const void *object, void *iterator_data); 124 125 /* Internal stuff */ 126 int skipped_ret; 127 bool possessed; 128 key_ref_t result; 129 struct timespec now; 130 }; 131 132 extern bool key_default_cmp(const struct key *key, 133 const struct key_match_data *match_data); 134 extern key_ref_t keyring_search_aux(key_ref_t keyring_ref, 135 struct keyring_search_context *ctx); 136 137 extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx); 138 extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx); 139 140 extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check); 141 142 extern int install_user_keyrings(void); 143 extern int install_thread_keyring_to_cred(struct cred *); 144 extern int install_process_keyring_to_cred(struct cred *); 145 extern int install_session_keyring_to_cred(struct cred *, struct key *); 146 147 extern struct key *request_key_and_link(struct key_type *type, 148 const char *description, 149 const void *callout_info, 150 size_t callout_len, 151 void *aux, 152 struct key *dest_keyring, 153 unsigned long flags); 154 155 extern bool lookup_user_key_possessed(const struct key *key, 156 const struct key_match_data *match_data); 157 extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags, 158 key_perm_t perm); 159 #define KEY_LOOKUP_CREATE 0x01 160 #define KEY_LOOKUP_PARTIAL 0x02 161 #define KEY_LOOKUP_FOR_UNLINK 0x04 162 163 extern long join_session_keyring(const char *name); 164 extern void key_change_session_keyring(struct callback_head *twork); 165 166 extern struct work_struct key_gc_work; 167 extern unsigned key_gc_delay; 168 extern void keyring_gc(struct key *keyring, time_t limit); 169 extern void key_schedule_gc(time_t gc_at); 170 extern void key_schedule_gc_links(void); 171 extern void key_gc_keytype(struct key_type *ktype); 172 173 extern int key_task_permission(const key_ref_t key_ref, 174 const struct cred *cred, 175 key_perm_t perm); 176 177 /* 178 * Check to see whether permission is granted to use a key in the desired way. 179 */ 180 static inline int key_permission(const key_ref_t key_ref, unsigned perm) 181 { 182 return key_task_permission(key_ref, current_cred(), perm); 183 } 184 185 /* 186 * Authorisation record for request_key(). 187 */ 188 struct request_key_auth { 189 struct key *target_key; 190 struct key *dest_keyring; 191 const struct cred *cred; 192 void *callout_info; 193 size_t callout_len; 194 pid_t pid; 195 }; 196 197 extern struct key_type key_type_request_key_auth; 198 extern struct key *request_key_auth_new(struct key *target, 199 const void *callout_info, 200 size_t callout_len, 201 struct key *dest_keyring); 202 203 extern struct key *key_get_instantiation_authkey(key_serial_t target_id); 204 205 /* 206 * Determine whether a key is dead. 207 */ 208 static inline bool key_is_dead(const struct key *key, time_t limit) 209 { 210 return 211 key->flags & ((1 << KEY_FLAG_DEAD) | 212 (1 << KEY_FLAG_INVALIDATED)) || 213 (key->expiry > 0 && key->expiry <= limit); 214 } 215 216 /* 217 * keyctl() functions 218 */ 219 extern long keyctl_get_keyring_ID(key_serial_t, int); 220 extern long keyctl_join_session_keyring(const char __user *); 221 extern long keyctl_update_key(key_serial_t, const void __user *, size_t); 222 extern long keyctl_revoke_key(key_serial_t); 223 extern long keyctl_keyring_clear(key_serial_t); 224 extern long keyctl_keyring_link(key_serial_t, key_serial_t); 225 extern long keyctl_keyring_unlink(key_serial_t, key_serial_t); 226 extern long keyctl_describe_key(key_serial_t, char __user *, size_t); 227 extern long keyctl_keyring_search(key_serial_t, const char __user *, 228 const char __user *, key_serial_t); 229 extern long keyctl_read_key(key_serial_t, char __user *, size_t); 230 extern long keyctl_chown_key(key_serial_t, uid_t, gid_t); 231 extern long keyctl_setperm_key(key_serial_t, key_perm_t); 232 extern long keyctl_instantiate_key(key_serial_t, const void __user *, 233 size_t, key_serial_t); 234 extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t); 235 extern long keyctl_set_reqkey_keyring(int); 236 extern long keyctl_set_timeout(key_serial_t, unsigned); 237 extern long keyctl_assume_authority(key_serial_t); 238 extern long keyctl_get_security(key_serial_t keyid, char __user *buffer, 239 size_t buflen); 240 extern long keyctl_session_to_parent(void); 241 extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t); 242 extern long keyctl_instantiate_key_iov(key_serial_t, 243 const struct iovec __user *, 244 unsigned, key_serial_t); 245 extern long keyctl_invalidate_key(key_serial_t); 246 247 struct iov_iter; 248 extern long keyctl_instantiate_key_common(key_serial_t, 249 struct iov_iter *, 250 key_serial_t); 251 #ifdef CONFIG_PERSISTENT_KEYRINGS 252 extern long keyctl_get_persistent(uid_t, key_serial_t); 253 extern unsigned persistent_keyring_expiry; 254 #else 255 static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring) 256 { 257 return -EOPNOTSUPP; 258 } 259 #endif 260 261 #ifdef CONFIG_KEY_DH_OPERATIONS 262 extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *, 263 size_t, void __user *); 264 #else 265 static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params, 266 char __user *buffer, size_t buflen, 267 void __user *reserved) 268 { 269 return -EOPNOTSUPP; 270 } 271 #endif 272 273 /* 274 * Debugging key validation 275 */ 276 #ifdef KEY_DEBUGGING 277 extern void __key_check(const struct key *); 278 279 static inline void key_check(const struct key *key) 280 { 281 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC)) 282 __key_check(key); 283 } 284 285 #else 286 287 #define key_check(key) do {} while(0) 288 289 #endif 290 291 #endif /* _INTERNAL_H */ 292