1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
6 * Casey Schaufler <casey@schaufler-ca.com>
9 #ifndef _SECURITY_SMACK_H
10 #define _SECURITY_SMACK_H
12 #include <linux/capability.h>
13 #include <linux/spinlock.h>
14 #include <linux/lsm_hooks.h>
16 #if IS_ENABLED(CONFIG_IPV6)
17 #include <linux/in6.h>
18 #endif /* CONFIG_IPV6 */
19 #include <net/netlabel.h>
20 #include <linux/list.h>
21 #include <linux/rculist.h>
22 #include <linux/lsm_audit.h>
23 #include <linux/msg.h>
26 * Use IPv6 port labeling if IPv6 is enabled and secmarks
29 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
30 #define SMACK_IPV6_PORT_LABELING 1
33 #if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
34 #define SMACK_IPV6_SECMARK_LABELING 1
38 * Smack labels were limited to 23 characters for a long time.
40 #define SMK_LABELLEN 24
41 #define SMK_LONGLABEL 256
44 * This is the repository for labels seen so that it is
45 * not necessary to keep allocating tiny chuncks of memory
46 * and so that they can be shared.
48 * Labels are never modified in place. Anytime a label
49 * is imported (e.g. xattrset on a file) the list is checked
50 * for it and it is added if it doesn't exist. The address
51 * is passed out in either case. Entries are added, but
54 * Since labels are hanging around anyway it doesn't
55 * hurt to maintain a secid for those awkward situations
56 * where kernel components that ought to use LSM independent
57 * interfaces don't. The secid should go away when all of
58 * these components have been repaired.
60 * The cipso value associated with the label gets stored here, too.
62 * Keep the access rules for this subject label here so that
63 * the entire set of rules does not need to be examined every
67 struct list_head list;
68 struct hlist_node smk_hashed;
71 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
72 struct list_head smk_rules; /* access rules */
73 struct mutex smk_rules_lock; /* lock for rules */
77 * Maximum number of bytes for the levels in a CIPSO IP option.
78 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
79 * bigger than can be used, and 24 is the next lower multiple
80 * of 8, and there are too many issues if there isn't space set
81 * aside for the terminating null byte.
83 #define SMK_CIPSOLEN 24
85 struct superblock_smack {
86 struct smack_known *smk_root;
87 struct smack_known *smk_floor;
88 struct smack_known *smk_hat;
89 struct smack_known *smk_default;
96 #define SMK_SB_INITIALIZED 0x01
97 #define SMK_SB_UNTRUSTED 0x02
100 struct smack_known *smk_out; /* outbound label */
101 struct smack_known *smk_in; /* inbound label */
102 struct smack_known *smk_packet; /* TCP peer label */
109 struct smack_known *smk_inode; /* label of the fso */
110 struct smack_known *smk_task; /* label of the task */
111 struct smack_known *smk_mmap; /* label of the mmap domain */
112 int smk_flags; /* smack inode flags */
116 struct smack_known *smk_task; /* label for access control */
117 struct smack_known *smk_forked; /* label when forked */
118 struct list_head smk_rules; /* per task access rules */
119 struct mutex smk_rules_lock; /* lock for the rules */
120 struct list_head smk_relabel; /* transit allowed labels */
123 #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
124 #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
125 #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
126 #define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
129 * A label access rule.
132 struct list_head list;
133 struct smack_known *smk_subject;
134 struct smack_known *smk_object;
139 * An entry in the table identifying IPv4 hosts.
141 struct smk_net4addr {
142 struct list_head list;
143 struct in_addr smk_host; /* network address */
144 struct in_addr smk_mask; /* network mask */
145 int smk_masks; /* mask size */
146 struct smack_known *smk_label; /* label */
150 * An entry in the table identifying IPv6 hosts.
152 struct smk_net6addr {
153 struct list_head list;
154 struct in6_addr smk_host; /* network address */
155 struct in6_addr smk_mask; /* network mask */
156 int smk_masks; /* mask size */
157 struct smack_known *smk_label; /* label */
161 * An entry in the table identifying ports.
163 struct smk_port_label {
164 struct list_head list;
165 struct sock *smk_sock; /* socket initialized on */
166 unsigned short smk_port; /* the port number */
167 struct smack_known *smk_in; /* inbound label */
168 struct smack_known *smk_out; /* outgoing label */
169 short smk_sock_type; /* Socket type */
173 struct smack_known_list_elem {
174 struct list_head list;
175 struct smack_known *smk_label;
178 /* Super block security struct flags for mount options */
179 #define FSDEFAULT_MNT 0x01
180 #define FSFLOOR_MNT 0x02
181 #define FSHAT_MNT 0x04
182 #define FSROOT_MNT 0x08
183 #define FSTRANS_MNT 0x10
185 #define NUM_SMK_MNT_OPTS 5
196 #define SMACK_DELETE_OPTION "-DELETE"
197 #define SMACK_CIPSO_OPTION "-CIPSO"
200 * How communications on this socket are treated.
201 * Usually it's determined by the underlying netlabel code
202 * but there are certain cases, including single label hosts
203 * and potentially single label interfaces for which the
204 * treatment can not be known in advance.
206 * The possibility of additional labeling schemes being
207 * introduced in the future exists as well.
209 #define SMACK_UNLABELED_SOCKET 0
210 #define SMACK_CIPSO_SOCKET 1
215 #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
216 #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
217 #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
218 #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
219 #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
221 * CIPSO 2.2 standard is 239, but Smack wants to use the
222 * categories in a structured way that limits the value to
223 * the bits in 23 bytes, hence the unusual number.
225 #define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
230 #define SMACK_PTRACE_DEFAULT 0
231 #define SMACK_PTRACE_EXACT 1
232 #define SMACK_PTRACE_DRACONIAN 2
233 #define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
236 * Flags for untraditional access modes.
237 * It shouldn't be necessary to avoid conflicts with definitions
238 * in fs.h, but do so anyway.
240 #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
241 #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
242 #define MAY_BRINGUP 0x00004000 /* Report use of this rule */
245 * The policy for delivering signals is configurable.
246 * It is usually "write", but can be "append".
248 #ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
249 #define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
251 #define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
254 #define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
255 #define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
256 #define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
259 * Just to make the common cases easier to deal with
261 #define MAY_ANYREAD (MAY_READ | MAY_EXEC)
262 #define MAY_READWRITE (MAY_READ | MAY_WRITE)
266 * Number of access types used by Smack (rwxatlb)
268 #define SMK_NUM_ACCESS_TYPE 7
271 struct smack_audit_data {
272 const char *function;
280 * Smack audit data; is empty if CONFIG_AUDIT not set
283 struct smk_audit_info {
285 struct common_audit_data a;
286 struct smack_audit_data sad;
291 * These functions are in smack_access.c
293 int smk_access_entry(char *, char *, struct list_head *);
294 int smk_access(struct smack_known *, struct smack_known *,
295 int, struct smk_audit_info *);
296 int smk_tskacc(struct task_smack *, struct smack_known *,
297 u32, struct smk_audit_info *);
298 int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
299 struct smack_known *smack_from_secid(const u32);
300 char *smk_parse_smack(const char *string, int len);
301 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
302 struct smack_known *smk_import_entry(const char *, int);
303 void smk_insert_entry(struct smack_known *skp);
304 struct smack_known *smk_find_entry(const char *);
305 bool smack_privileged(int cap);
306 bool smack_privileged_cred(int cap, const struct cred *cred);
307 void smk_destroy_label_list(struct list_head *list);
312 extern int smack_enabled;
313 extern int smack_cipso_direct;
314 extern int smack_cipso_mapped;
315 extern struct smack_known *smack_net_ambient;
316 extern struct smack_known *smack_syslog_label;
317 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
318 extern struct smack_known *smack_unconfined;
320 extern int smack_ptrace_rule;
321 extern struct lsm_blob_sizes smack_blob_sizes;
323 extern struct smack_known smack_known_floor;
324 extern struct smack_known smack_known_hat;
325 extern struct smack_known smack_known_huh;
326 extern struct smack_known smack_known_star;
327 extern struct smack_known smack_known_web;
329 extern struct mutex smack_known_lock;
330 extern struct list_head smack_known_list;
331 extern struct list_head smk_net4addr_list;
332 extern struct list_head smk_net6addr_list;
334 extern struct mutex smack_onlycap_lock;
335 extern struct list_head smack_onlycap_list;
337 #define SMACK_HASH_SLOTS 16
338 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
339 extern struct kmem_cache *smack_rule_cache;
341 static inline struct task_smack *smack_cred(const struct cred *cred)
343 return cred->security + smack_blob_sizes.lbs_cred;
346 static inline struct smack_known **smack_file(const struct file *file)
348 return (struct smack_known **)(file->f_security +
349 smack_blob_sizes.lbs_file);
352 static inline struct inode_smack *smack_inode(const struct inode *inode)
354 return inode->i_security + smack_blob_sizes.lbs_inode;
357 static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
359 return msg->security + smack_blob_sizes.lbs_msg_msg;
362 static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
364 return ipc->security + smack_blob_sizes.lbs_ipc;
368 * Is the directory transmuting?
370 static inline int smk_inode_transmutable(const struct inode *isp)
372 struct inode_smack *sip = smack_inode(isp);
373 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
377 * Present a pointer to the smack label entry in an inode blob.
379 static inline struct smack_known *smk_of_inode(const struct inode *isp)
381 struct inode_smack *sip = smack_inode(isp);
382 return sip->smk_inode;
386 * Present a pointer to the smack label entry in an task blob.
388 static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
390 return tsp->smk_task;
393 static inline struct smack_known *smk_of_task_struct(
394 const struct task_struct *t)
396 struct smack_known *skp;
397 const struct cred *cred;
401 cred = __task_cred(t);
402 skp = smk_of_task(smack_cred(cred));
410 * Present a pointer to the forked smack label entry in an task blob.
412 static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
414 return tsp->smk_forked;
418 * Present a pointer to the smack label in the current task blob.
420 static inline struct smack_known *smk_of_current(void)
422 return smk_of_task(smack_cred(current_cred()));
428 #define SMACK_AUDIT_DENIED 0x1
429 #define SMACK_AUDIT_ACCEPT 0x2
430 extern int log_policy;
432 void smack_log(char *subject_label, char *object_label,
434 int result, struct smk_audit_info *auditdata);
439 * some inline functions to set up audit data
440 * they do nothing if CONFIG_AUDIT is not set
443 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
446 memset(&a->sad, 0, sizeof(a->sad));
448 a->a.smack_audit_data = &a->sad;
449 a->a.smack_audit_data->function = func;
452 static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
453 char type, struct lsm_network_audit *net)
455 smk_ad_init(a, func, type);
456 memset(net, 0, sizeof(*net));
460 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
461 struct task_struct *t)
465 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
470 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
475 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
480 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
488 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
492 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
493 struct task_struct *t)
496 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
500 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
504 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
508 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
514 #endif /* _SECURITY_SMACK_H */