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v6.2
  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
  4 *
  5 * Author:
  6 *      Casey Schaufler <casey@schaufler-ca.com>
  7 */
  8
  9#ifndef _SECURITY_SMACK_H
 10#define _SECURITY_SMACK_H
 11
 12#include <linux/capability.h>
 13#include <linux/spinlock.h>
 14#include <linux/lsm_hooks.h>
 15#include <linux/in.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>
 24
 25/*
 26 * Use IPv6 port labeling if IPv6 is enabled and secmarks
 27 * are not being used.
 28 */
 29#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
 30#define SMACK_IPV6_PORT_LABELING 1
 31#endif
 32
 33#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
 34#define SMACK_IPV6_SECMARK_LABELING 1
 35#endif
 36
 37/*
 38 * Smack labels were limited to 23 characters for a long time.
 39 */
 40#define SMK_LABELLEN	24
 41#define SMK_LONGLABEL	256
 42
 43/*
 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.
 47 *
 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
 52 * never deleted.
 53 *
 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.
 59 *
 60 * The cipso value associated with the label gets stored here, too.
 61 *
 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
 64 * time.
 65 */
 66struct smack_known {
 67	struct list_head		list;
 68	struct hlist_node		smk_hashed;
 69	char				*smk_known;
 70	u32				smk_secid;
 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 */
 74};
 75
 76/*
 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.
 82 */
 83#define SMK_CIPSOLEN	24
 84
 85struct 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;
 90	int			smk_flags;
 91};
 92
 93/*
 94 * Superblock flags
 95 */
 96#define SMK_SB_INITIALIZED	0x01
 97#define SMK_SB_UNTRUSTED	0x02
 98
 99struct socket_smack {
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 */
103	int			smk_state;	/* netlabel socket states */
104};
105#define	SMK_NETLBL_UNSET	0
106#define	SMK_NETLBL_UNLABELED	1
107#define	SMK_NETLBL_LABELED	2
108#define	SMK_NETLBL_REQSKB	3
109
110/*
111 * Inode smack data
112 */
113struct inode_smack {
114	struct smack_known	*smk_inode;	/* label of the fso */
115	struct smack_known	*smk_task;	/* label of the task */
116	struct smack_known	*smk_mmap;	/* label of the mmap domain */
117	int			smk_flags;	/* smack inode flags */
118};
119
120struct task_smack {
121	struct smack_known	*smk_task;	/* label for access control */
122	struct smack_known	*smk_forked;	/* label when forked */
 
123	struct list_head	smk_rules;	/* per task access rules */
124	struct mutex		smk_rules_lock;	/* lock for the rules */
125	struct list_head	smk_relabel;	/* transit allowed labels */
126};
127
128#define	SMK_INODE_INSTANT	0x01	/* inode is instantiated */
129#define	SMK_INODE_TRANSMUTE	0x02	/* directory is transmuting */
130#define	SMK_INODE_CHANGED	0x04	/* smack was transmuted */
131#define	SMK_INODE_IMPURE	0x08	/* involved in an impure transaction */
132
133/*
134 * A label access rule.
135 */
136struct smack_rule {
137	struct list_head	list;
138	struct smack_known	*smk_subject;
139	struct smack_known	*smk_object;
140	int			smk_access;
141};
142
143/*
144 * An entry in the table identifying IPv4 hosts.
145 */
146struct smk_net4addr {
147	struct list_head	list;
148	struct in_addr		smk_host;	/* network address */
149	struct in_addr		smk_mask;	/* network mask */
150	int			smk_masks;	/* mask size */
151	struct smack_known	*smk_label;	/* label */
152};
153
154/*
155 * An entry in the table identifying IPv6 hosts.
156 */
157struct smk_net6addr {
158	struct list_head	list;
159	struct in6_addr		smk_host;	/* network address */
160	struct in6_addr		smk_mask;	/* network mask */
161	int			smk_masks;	/* mask size */
162	struct smack_known	*smk_label;	/* label */
163};
164
165/*
166 * An entry in the table identifying ports.
167 */
168struct smk_port_label {
169	struct list_head	list;
170	struct sock		*smk_sock;	/* socket initialized on */
171	unsigned short		smk_port;	/* the port number */
172	struct smack_known	*smk_in;	/* inbound label */
173	struct smack_known	*smk_out;	/* outgoing label */
174	short			smk_sock_type;	/* Socket type */
175	short			smk_can_reuse;
176};
177
178struct smack_known_list_elem {
179	struct list_head	list;
180	struct smack_known	*smk_label;
181};
182
183enum {
184	Opt_error = -1,
185	Opt_fsdefault = 0,
186	Opt_fsfloor = 1,
187	Opt_fshat = 2,
188	Opt_fsroot = 3,
189	Opt_fstransmute = 4,
190};
191
192#define SMACK_DELETE_OPTION	"-DELETE"
193#define SMACK_CIPSO_OPTION 	"-CIPSO"
194
195/*
196 * CIPSO defaults.
197 */
198#define SMACK_CIPSO_DOI_DEFAULT		3	/* Historical */
199#define SMACK_CIPSO_DOI_INVALID		-1	/* Not a DOI */
200#define SMACK_CIPSO_DIRECT_DEFAULT	250	/* Arbitrary */
201#define SMACK_CIPSO_MAPPED_DEFAULT	251	/* Also arbitrary */
202#define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
203/*
204 * CIPSO 2.2 standard is 239, but Smack wants to use the
205 * categories in a structured way that limits the value to
206 * the bits in 23 bytes, hence the unusual number.
207 */
208#define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */
209
210/*
211 * Ptrace rules
212 */
213#define SMACK_PTRACE_DEFAULT	0
214#define SMACK_PTRACE_EXACT	1
215#define SMACK_PTRACE_DRACONIAN	2
216#define SMACK_PTRACE_MAX	SMACK_PTRACE_DRACONIAN
217
218/*
219 * Flags for untraditional access modes.
220 * It shouldn't be necessary to avoid conflicts with definitions
221 * in fs.h, but do so anyway.
222 */
223#define MAY_TRANSMUTE	0x00001000	/* Controls directory labeling */
224#define MAY_LOCK	0x00002000	/* Locks should be writes, but ... */
225#define MAY_BRINGUP	0x00004000	/* Report use of this rule */
226
227/*
228 * The policy for delivering signals is configurable.
229 * It is usually "write", but can be "append".
230 */
231#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
232#define MAY_DELIVER	MAY_APPEND	/* Signal delivery requires append */
233#else
234#define MAY_DELIVER	MAY_WRITE	/* Signal delivery requires write */
235#endif
236
237#define SMACK_BRINGUP_ALLOW		1	/* Allow bringup mode */
238#define SMACK_UNCONFINED_SUBJECT	2	/* Allow unconfined label */
239#define SMACK_UNCONFINED_OBJECT		3	/* Allow unconfined label */
240
241/*
242 * Just to make the common cases easier to deal with
243 */
244#define MAY_ANYREAD	(MAY_READ | MAY_EXEC)
245#define MAY_READWRITE	(MAY_READ | MAY_WRITE)
246#define MAY_NOT		0
247
248/*
249 * Number of access types used by Smack (rwxatlb)
250 */
251#define SMK_NUM_ACCESS_TYPE 7
252
253/* SMACK data */
254struct smack_audit_data {
255	const char *function;
256	char *subject;
257	char *object;
258	char *request;
259	int result;
260};
261
262/*
263 * Smack audit data; is empty if CONFIG_AUDIT not set
264 * to save some stack
265 */
266struct smk_audit_info {
267#ifdef CONFIG_AUDIT
268	struct common_audit_data a;
269	struct smack_audit_data sad;
270#endif
271};
272
273/*
274 * These functions are in smack_access.c
275 */
276int smk_access_entry(char *, char *, struct list_head *);
277int smk_access(struct smack_known *, struct smack_known *,
278	       int, struct smk_audit_info *);
279int smk_tskacc(struct task_smack *, struct smack_known *,
280	       u32, struct smk_audit_info *);
281int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
282struct smack_known *smack_from_secid(const u32);
283char *smk_parse_smack(const char *string, int len);
284int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
285struct smack_known *smk_import_entry(const char *, int);
286void smk_insert_entry(struct smack_known *skp);
287struct smack_known *smk_find_entry(const char *);
288bool smack_privileged(int cap);
289bool smack_privileged_cred(int cap, const struct cred *cred);
290void smk_destroy_label_list(struct list_head *list);
291int smack_populate_secattr(struct smack_known *skp);
292
293/*
294 * Shared data.
295 */
296extern int smack_enabled __initdata;
297extern int smack_cipso_direct;
298extern int smack_cipso_mapped;
299extern struct smack_known *smack_net_ambient;
300extern struct smack_known *smack_syslog_label;
301#ifdef CONFIG_SECURITY_SMACK_BRINGUP
302extern struct smack_known *smack_unconfined;
303#endif
304extern int smack_ptrace_rule;
305extern struct lsm_blob_sizes smack_blob_sizes;
306
307extern struct smack_known smack_known_floor;
308extern struct smack_known smack_known_hat;
309extern struct smack_known smack_known_huh;
310extern struct smack_known smack_known_star;
311extern struct smack_known smack_known_web;
312
313extern struct mutex	smack_known_lock;
314extern struct list_head smack_known_list;
315extern struct list_head smk_net4addr_list;
316extern struct list_head smk_net6addr_list;
317
318extern struct mutex     smack_onlycap_lock;
319extern struct list_head smack_onlycap_list;
320
321#define SMACK_HASH_SLOTS 16
322extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
323extern struct kmem_cache *smack_rule_cache;
324
325static inline struct task_smack *smack_cred(const struct cred *cred)
326{
327	return cred->security + smack_blob_sizes.lbs_cred;
328}
329
330static inline struct smack_known **smack_file(const struct file *file)
331{
332	return (struct smack_known **)(file->f_security +
333				       smack_blob_sizes.lbs_file);
334}
335
336static inline struct inode_smack *smack_inode(const struct inode *inode)
337{
338	return inode->i_security + smack_blob_sizes.lbs_inode;
339}
340
341static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
342{
343	return msg->security + smack_blob_sizes.lbs_msg_msg;
344}
345
346static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
347{
348	return ipc->security + smack_blob_sizes.lbs_ipc;
349}
350
351static inline struct superblock_smack *smack_superblock(
352					const struct super_block *superblock)
353{
354	return superblock->s_security + smack_blob_sizes.lbs_superblock;
355}
356
357/*
358 * Is the directory transmuting?
359 */
360static inline int smk_inode_transmutable(const struct inode *isp)
361{
362	struct inode_smack *sip = smack_inode(isp);
363	return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
364}
365
366/*
367 * Present a pointer to the smack label entry in an inode blob.
368 */
369static inline struct smack_known *smk_of_inode(const struct inode *isp)
370{
371	struct inode_smack *sip = smack_inode(isp);
372	return sip->smk_inode;
373}
374
375/*
376 * Present a pointer to the smack label entry in an task blob.
377 */
378static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
379{
380	return tsp->smk_task;
381}
382
383static inline struct smack_known *smk_of_task_struct_obj(
384						const struct task_struct *t)
385{
386	struct smack_known *skp;
387	const struct cred *cred;
388
389	rcu_read_lock();
390
391	cred = __task_cred(t);
392	skp = smk_of_task(smack_cred(cred));
393
394	rcu_read_unlock();
395
396	return skp;
397}
398
399/*
400 * Present a pointer to the forked smack label entry in an task blob.
401 */
402static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
403{
404	return tsp->smk_forked;
405}
406
407/*
408 * Present a pointer to the smack label in the current task blob.
409 */
410static inline struct smack_known *smk_of_current(void)
411{
412	return smk_of_task(smack_cred(current_cred()));
413}
414
415/*
416 * logging functions
417 */
418#define SMACK_AUDIT_DENIED 0x1
419#define SMACK_AUDIT_ACCEPT 0x2
420extern int log_policy;
421
422void smack_log(char *subject_label, char *object_label,
423		int request,
424		int result, struct smk_audit_info *auditdata);
425
426#ifdef CONFIG_AUDIT
427
428/*
429 * some inline functions to set up audit data
430 * they do nothing if CONFIG_AUDIT is not set
431 *
432 */
433static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
434			       char type)
435{
436	memset(&a->sad, 0, sizeof(a->sad));
437	a->a.type = type;
438	a->a.smack_audit_data = &a->sad;
439	a->a.smack_audit_data->function = func;
440}
441
442static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
443				   char type, struct lsm_network_audit *net)
444{
445	smk_ad_init(a, func, type);
446	memset(net, 0, sizeof(*net));
447	a->a.u.net = net;
448}
449
450static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
451					 struct task_struct *t)
452{
453	a->a.u.tsk = t;
454}
455static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
456						    struct dentry *d)
457{
458	a->a.u.dentry = d;
459}
460static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
461					      struct inode *i)
462{
463	a->a.u.inode = i;
464}
465static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
466					     struct path p)
467{
468	a->a.u.path = p;
469}
470static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
471					    struct sock *sk)
472{
473	a->a.u.net->sk = sk;
474}
475
476#else /* no AUDIT */
477
478static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
479			       char type)
480{
481}
482static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
483					 struct task_struct *t)
484{
485}
486static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
487						    struct dentry *d)
488{
489}
490static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
491					      struct inode *i)
492{
493}
494static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
495					     struct path p)
496{
497}
498static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
499					    struct sock *sk)
500{
501}
502#endif
503
504#endif  /* _SECURITY_SMACK_H */
v6.8
  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
  4 *
  5 * Author:
  6 *      Casey Schaufler <casey@schaufler-ca.com>
  7 */
  8
  9#ifndef _SECURITY_SMACK_H
 10#define _SECURITY_SMACK_H
 11
 12#include <linux/capability.h>
 13#include <linux/spinlock.h>
 14#include <linux/lsm_hooks.h>
 15#include <linux/in.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>
 24
 25/*
 26 * Use IPv6 port labeling if IPv6 is enabled and secmarks
 27 * are not being used.
 28 */
 29#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
 30#define SMACK_IPV6_PORT_LABELING 1
 31#endif
 32
 33#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
 34#define SMACK_IPV6_SECMARK_LABELING 1
 35#endif
 36
 37/*
 38 * Smack labels were limited to 23 characters for a long time.
 39 */
 40#define SMK_LABELLEN	24
 41#define SMK_LONGLABEL	256
 42
 43/*
 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.
 47 *
 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
 52 * never deleted.
 53 *
 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.
 59 *
 60 * The cipso value associated with the label gets stored here, too.
 61 *
 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
 64 * time.
 65 */
 66struct smack_known {
 67	struct list_head		list;
 68	struct hlist_node		smk_hashed;
 69	char				*smk_known;
 70	u32				smk_secid;
 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 */
 74};
 75
 76/*
 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.
 82 */
 83#define SMK_CIPSOLEN	24
 84
 85struct 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;
 90	int			smk_flags;
 91};
 92
 93/*
 94 * Superblock flags
 95 */
 96#define SMK_SB_INITIALIZED	0x01
 97#define SMK_SB_UNTRUSTED	0x02
 98
 99struct socket_smack {
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 */
103	int			smk_state;	/* netlabel socket states */
104};
105#define	SMK_NETLBL_UNSET	0
106#define	SMK_NETLBL_UNLABELED	1
107#define	SMK_NETLBL_LABELED	2
108#define	SMK_NETLBL_REQSKB	3
109
110/*
111 * Inode smack data
112 */
113struct inode_smack {
114	struct smack_known	*smk_inode;	/* label of the fso */
115	struct smack_known	*smk_task;	/* label of the task */
116	struct smack_known	*smk_mmap;	/* label of the mmap domain */
117	int			smk_flags;	/* smack inode flags */
118};
119
120struct task_smack {
121	struct smack_known	*smk_task;	/* label for access control */
122	struct smack_known	*smk_forked;	/* label when forked */
123	struct smack_known	*smk_transmuted;/* label when transmuted */
124	struct list_head	smk_rules;	/* per task access rules */
125	struct mutex		smk_rules_lock;	/* lock for the rules */
126	struct list_head	smk_relabel;	/* transit allowed labels */
127};
128
129#define	SMK_INODE_INSTANT	0x01	/* inode is instantiated */
130#define	SMK_INODE_TRANSMUTE	0x02	/* directory is transmuting */
131#define	SMK_INODE_CHANGED	0x04	/* smack was transmuted (unused) */
132#define	SMK_INODE_IMPURE	0x08	/* involved in an impure transaction */
133
134/*
135 * A label access rule.
136 */
137struct smack_rule {
138	struct list_head	list;
139	struct smack_known	*smk_subject;
140	struct smack_known	*smk_object;
141	int			smk_access;
142};
143
144/*
145 * An entry in the table identifying IPv4 hosts.
146 */
147struct smk_net4addr {
148	struct list_head	list;
149	struct in_addr		smk_host;	/* network address */
150	struct in_addr		smk_mask;	/* network mask */
151	int			smk_masks;	/* mask size */
152	struct smack_known	*smk_label;	/* label */
153};
154
155/*
156 * An entry in the table identifying IPv6 hosts.
157 */
158struct smk_net6addr {
159	struct list_head	list;
160	struct in6_addr		smk_host;	/* network address */
161	struct in6_addr		smk_mask;	/* network mask */
162	int			smk_masks;	/* mask size */
163	struct smack_known	*smk_label;	/* label */
164};
165
166/*
167 * An entry in the table identifying ports.
168 */
169struct smk_port_label {
170	struct list_head	list;
171	struct sock		*smk_sock;	/* socket initialized on */
172	unsigned short		smk_port;	/* the port number */
173	struct smack_known	*smk_in;	/* inbound label */
174	struct smack_known	*smk_out;	/* outgoing label */
175	short			smk_sock_type;	/* Socket type */
176	short			smk_can_reuse;
177};
178
179struct smack_known_list_elem {
180	struct list_head	list;
181	struct smack_known	*smk_label;
182};
183
184enum {
185	Opt_error = -1,
186	Opt_fsdefault = 0,
187	Opt_fsfloor = 1,
188	Opt_fshat = 2,
189	Opt_fsroot = 3,
190	Opt_fstransmute = 4,
191};
192
193#define SMACK_DELETE_OPTION	"-DELETE"
194#define SMACK_CIPSO_OPTION 	"-CIPSO"
195
196/*
197 * CIPSO defaults.
198 */
199#define SMACK_CIPSO_DOI_DEFAULT		3	/* Historical */
200#define SMACK_CIPSO_DOI_INVALID		-1	/* Not a DOI */
201#define SMACK_CIPSO_DIRECT_DEFAULT	250	/* Arbitrary */
202#define SMACK_CIPSO_MAPPED_DEFAULT	251	/* Also arbitrary */
203#define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
204/*
205 * CIPSO 2.2 standard is 239, but Smack wants to use the
206 * categories in a structured way that limits the value to
207 * the bits in 23 bytes, hence the unusual number.
208 */
209#define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */
210
211/*
212 * Ptrace rules
213 */
214#define SMACK_PTRACE_DEFAULT	0
215#define SMACK_PTRACE_EXACT	1
216#define SMACK_PTRACE_DRACONIAN	2
217#define SMACK_PTRACE_MAX	SMACK_PTRACE_DRACONIAN
218
219/*
220 * Flags for untraditional access modes.
221 * It shouldn't be necessary to avoid conflicts with definitions
222 * in fs.h, but do so anyway.
223 */
224#define MAY_TRANSMUTE	0x00001000	/* Controls directory labeling */
225#define MAY_LOCK	0x00002000	/* Locks should be writes, but ... */
226#define MAY_BRINGUP	0x00004000	/* Report use of this rule */
227
228/*
229 * The policy for delivering signals is configurable.
230 * It is usually "write", but can be "append".
231 */
232#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
233#define MAY_DELIVER	MAY_APPEND	/* Signal delivery requires append */
234#else
235#define MAY_DELIVER	MAY_WRITE	/* Signal delivery requires write */
236#endif
237
238#define SMACK_BRINGUP_ALLOW		1	/* Allow bringup mode */
239#define SMACK_UNCONFINED_SUBJECT	2	/* Allow unconfined label */
240#define SMACK_UNCONFINED_OBJECT		3	/* Allow unconfined label */
241
242/*
243 * Just to make the common cases easier to deal with
244 */
245#define MAY_ANYREAD	(MAY_READ | MAY_EXEC)
246#define MAY_READWRITE	(MAY_READ | MAY_WRITE)
247#define MAY_NOT		0
248
249/*
250 * Number of access types used by Smack (rwxatlb)
251 */
252#define SMK_NUM_ACCESS_TYPE 7
253
254/* SMACK data */
255struct smack_audit_data {
256	const char *function;
257	char *subject;
258	char *object;
259	char *request;
260	int result;
261};
262
263/*
264 * Smack audit data; is empty if CONFIG_AUDIT not set
265 * to save some stack
266 */
267struct smk_audit_info {
268#ifdef CONFIG_AUDIT
269	struct common_audit_data a;
270	struct smack_audit_data sad;
271#endif
272};
273
274/*
275 * These functions are in smack_access.c
276 */
277int smk_access_entry(char *, char *, struct list_head *);
278int smk_access(struct smack_known *, struct smack_known *,
279	       int, struct smk_audit_info *);
280int smk_tskacc(struct task_smack *, struct smack_known *,
281	       u32, struct smk_audit_info *);
282int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
283struct smack_known *smack_from_secid(const u32);
284char *smk_parse_smack(const char *string, int len);
285int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
286struct smack_known *smk_import_entry(const char *, int);
287void smk_insert_entry(struct smack_known *skp);
288struct smack_known *smk_find_entry(const char *);
289bool smack_privileged(int cap);
290bool smack_privileged_cred(int cap, const struct cred *cred);
291void smk_destroy_label_list(struct list_head *list);
292int smack_populate_secattr(struct smack_known *skp);
293
294/*
295 * Shared data.
296 */
297extern int smack_enabled __initdata;
298extern int smack_cipso_direct;
299extern int smack_cipso_mapped;
300extern struct smack_known *smack_net_ambient;
301extern struct smack_known *smack_syslog_label;
302#ifdef CONFIG_SECURITY_SMACK_BRINGUP
303extern struct smack_known *smack_unconfined;
304#endif
305extern int smack_ptrace_rule;
306extern struct lsm_blob_sizes smack_blob_sizes;
307
308extern struct smack_known smack_known_floor;
309extern struct smack_known smack_known_hat;
310extern struct smack_known smack_known_huh;
311extern struct smack_known smack_known_star;
312extern struct smack_known smack_known_web;
313
314extern struct mutex	smack_known_lock;
315extern struct list_head smack_known_list;
316extern struct list_head smk_net4addr_list;
317extern struct list_head smk_net6addr_list;
318
319extern struct mutex     smack_onlycap_lock;
320extern struct list_head smack_onlycap_list;
321
322#define SMACK_HASH_SLOTS 16
323extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
324extern struct kmem_cache *smack_rule_cache;
325
326static inline struct task_smack *smack_cred(const struct cred *cred)
327{
328	return cred->security + smack_blob_sizes.lbs_cred;
329}
330
331static inline struct smack_known **smack_file(const struct file *file)
332{
333	return (struct smack_known **)(file->f_security +
334				       smack_blob_sizes.lbs_file);
335}
336
337static inline struct inode_smack *smack_inode(const struct inode *inode)
338{
339	return inode->i_security + smack_blob_sizes.lbs_inode;
340}
341
342static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
343{
344	return msg->security + smack_blob_sizes.lbs_msg_msg;
345}
346
347static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
348{
349	return ipc->security + smack_blob_sizes.lbs_ipc;
350}
351
352static inline struct superblock_smack *smack_superblock(
353					const struct super_block *superblock)
354{
355	return superblock->s_security + smack_blob_sizes.lbs_superblock;
356}
357
358/*
359 * Is the directory transmuting?
360 */
361static inline int smk_inode_transmutable(const struct inode *isp)
362{
363	struct inode_smack *sip = smack_inode(isp);
364	return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
365}
366
367/*
368 * Present a pointer to the smack label entry in an inode blob.
369 */
370static inline struct smack_known *smk_of_inode(const struct inode *isp)
371{
372	struct inode_smack *sip = smack_inode(isp);
373	return sip->smk_inode;
374}
375
376/*
377 * Present a pointer to the smack label entry in an task blob.
378 */
379static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
380{
381	return tsp->smk_task;
382}
383
384static inline struct smack_known *smk_of_task_struct_obj(
385						const struct task_struct *t)
386{
387	struct smack_known *skp;
388	const struct cred *cred;
389
390	rcu_read_lock();
391
392	cred = __task_cred(t);
393	skp = smk_of_task(smack_cred(cred));
394
395	rcu_read_unlock();
396
397	return skp;
398}
399
400/*
401 * Present a pointer to the forked smack label entry in an task blob.
402 */
403static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
404{
405	return tsp->smk_forked;
406}
407
408/*
409 * Present a pointer to the smack label in the current task blob.
410 */
411static inline struct smack_known *smk_of_current(void)
412{
413	return smk_of_task(smack_cred(current_cred()));
414}
415
416/*
417 * logging functions
418 */
419#define SMACK_AUDIT_DENIED 0x1
420#define SMACK_AUDIT_ACCEPT 0x2
421extern int log_policy;
422
423void smack_log(char *subject_label, char *object_label,
424		int request,
425		int result, struct smk_audit_info *auditdata);
426
427#ifdef CONFIG_AUDIT
428
429/*
430 * some inline functions to set up audit data
431 * they do nothing if CONFIG_AUDIT is not set
432 *
433 */
434static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
435			       char type)
436{
437	memset(&a->sad, 0, sizeof(a->sad));
438	a->a.type = type;
439	a->a.smack_audit_data = &a->sad;
440	a->a.smack_audit_data->function = func;
441}
442
443static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
444				   char type, struct lsm_network_audit *net)
445{
446	smk_ad_init(a, func, type);
447	memset(net, 0, sizeof(*net));
448	a->a.u.net = net;
449}
450
451static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
452					 struct task_struct *t)
453{
454	a->a.u.tsk = t;
455}
456static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
457						    struct dentry *d)
458{
459	a->a.u.dentry = d;
460}
461static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
462					      struct inode *i)
463{
464	a->a.u.inode = i;
465}
466static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
467					     struct path p)
468{
469	a->a.u.path = p;
470}
471static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
472					    struct sock *sk)
473{
474	a->a.u.net->sk = sk;
475}
476
477#else /* no AUDIT */
478
479static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
480			       char type)
481{
482}
483static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
484					 struct task_struct *t)
485{
486}
487static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
488						    struct dentry *d)
489{
490}
491static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
492					      struct inode *i)
493{
494}
495static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
496					     struct path p)
497{
498}
499static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
500					    struct sock *sk)
501{
502}
503#endif
504
505#endif  /* _SECURITY_SMACK_H */