Loading...
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Author:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 *
11 */
12
13#ifndef _SECURITY_SMACK_H
14#define _SECURITY_SMACK_H
15
16#include <linux/capability.h>
17#include <linux/spinlock.h>
18#include <linux/lsm_hooks.h>
19#include <linux/in.h>
20#if IS_ENABLED(CONFIG_IPV6)
21#include <linux/in6.h>
22#endif /* CONFIG_IPV6 */
23#include <net/netlabel.h>
24#include <linux/list.h>
25#include <linux/rculist.h>
26#include <linux/lsm_audit.h>
27
28/*
29 * Use IPv6 port labeling if IPv6 is enabled and secmarks
30 * are not being used.
31 */
32#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
33#define SMACK_IPV6_PORT_LABELING 1
34#endif
35
36#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
37#define SMACK_IPV6_SECMARK_LABELING 1
38#endif
39
40/*
41 * Smack labels were limited to 23 characters for a long time.
42 */
43#define SMK_LABELLEN 24
44#define SMK_LONGLABEL 256
45
46/*
47 * This is the repository for labels seen so that it is
48 * not necessary to keep allocating tiny chuncks of memory
49 * and so that they can be shared.
50 *
51 * Labels are never modified in place. Anytime a label
52 * is imported (e.g. xattrset on a file) the list is checked
53 * for it and it is added if it doesn't exist. The address
54 * is passed out in either case. Entries are added, but
55 * never deleted.
56 *
57 * Since labels are hanging around anyway it doesn't
58 * hurt to maintain a secid for those awkward situations
59 * where kernel components that ought to use LSM independent
60 * interfaces don't. The secid should go away when all of
61 * these components have been repaired.
62 *
63 * The cipso value associated with the label gets stored here, too.
64 *
65 * Keep the access rules for this subject label here so that
66 * the entire set of rules does not need to be examined every
67 * time.
68 */
69struct smack_known {
70 struct list_head list;
71 struct hlist_node smk_hashed;
72 char *smk_known;
73 u32 smk_secid;
74 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
75 struct list_head smk_rules; /* access rules */
76 struct mutex smk_rules_lock; /* lock for rules */
77};
78
79/*
80 * Maximum number of bytes for the levels in a CIPSO IP option.
81 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
82 * bigger than can be used, and 24 is the next lower multiple
83 * of 8, and there are too many issues if there isn't space set
84 * aside for the terminating null byte.
85 */
86#define SMK_CIPSOLEN 24
87
88struct superblock_smack {
89 struct smack_known *smk_root;
90 struct smack_known *smk_floor;
91 struct smack_known *smk_hat;
92 struct smack_known *smk_default;
93 int smk_flags;
94};
95
96/*
97 * Superblock flags
98 */
99#define SMK_SB_INITIALIZED 0x01
100#define SMK_SB_UNTRUSTED 0x02
101
102struct socket_smack {
103 struct smack_known *smk_out; /* outbound label */
104 struct smack_known *smk_in; /* inbound label */
105 struct smack_known *smk_packet; /* TCP peer label */
106};
107
108/*
109 * Inode smack data
110 */
111struct inode_smack {
112 struct smack_known *smk_inode; /* label of the fso */
113 struct smack_known *smk_task; /* label of the task */
114 struct smack_known *smk_mmap; /* label of the mmap domain */
115 struct mutex smk_lock; /* initialization lock */
116 int smk_flags; /* smack inode flags */
117 struct rcu_head smk_rcu; /* for freeing inode_smack */
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#if IS_ENABLED(CONFIG_IPV6)
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#endif /* CONFIG_IPV6 */
166
167#ifdef SMACK_IPV6_PORT_LABELING
168/*
169 * An entry in the table identifying ports.
170 */
171struct smk_port_label {
172 struct list_head list;
173 struct sock *smk_sock; /* socket initialized on */
174 unsigned short smk_port; /* the port number */
175 struct smack_known *smk_in; /* inbound label */
176 struct smack_known *smk_out; /* outgoing label */
177 short smk_sock_type; /* Socket type */
178 short smk_can_reuse;
179};
180#endif /* SMACK_IPV6_PORT_LABELING */
181
182struct smack_known_list_elem {
183 struct list_head list;
184 struct smack_known *smk_label;
185};
186
187/* Super block security struct flags for mount options */
188#define FSDEFAULT_MNT 0x01
189#define FSFLOOR_MNT 0x02
190#define FSHAT_MNT 0x04
191#define FSROOT_MNT 0x08
192#define FSTRANS_MNT 0x10
193
194#define NUM_SMK_MNT_OPTS 5
195
196enum {
197 Opt_error = -1,
198 Opt_fsdefault = 1,
199 Opt_fsfloor = 2,
200 Opt_fshat = 3,
201 Opt_fsroot = 4,
202 Opt_fstransmute = 5,
203};
204
205/*
206 * Mount options
207 */
208#define SMK_FSDEFAULT "smackfsdef="
209#define SMK_FSFLOOR "smackfsfloor="
210#define SMK_FSHAT "smackfshat="
211#define SMK_FSROOT "smackfsroot="
212#define SMK_FSTRANS "smackfstransmute="
213
214#define SMACK_DELETE_OPTION "-DELETE"
215#define SMACK_CIPSO_OPTION "-CIPSO"
216
217/*
218 * How communications on this socket are treated.
219 * Usually it's determined by the underlying netlabel code
220 * but there are certain cases, including single label hosts
221 * and potentially single label interfaces for which the
222 * treatment can not be known in advance.
223 *
224 * The possibility of additional labeling schemes being
225 * introduced in the future exists as well.
226 */
227#define SMACK_UNLABELED_SOCKET 0
228#define SMACK_CIPSO_SOCKET 1
229
230/*
231 * CIPSO defaults.
232 */
233#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
234#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
235#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
236#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
237#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
238/*
239 * CIPSO 2.2 standard is 239, but Smack wants to use the
240 * categories in a structured way that limits the value to
241 * the bits in 23 bytes, hence the unusual number.
242 */
243#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
244
245/*
246 * Ptrace rules
247 */
248#define SMACK_PTRACE_DEFAULT 0
249#define SMACK_PTRACE_EXACT 1
250#define SMACK_PTRACE_DRACONIAN 2
251#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
252
253/*
254 * Flags for untraditional access modes.
255 * It shouldn't be necessary to avoid conflicts with definitions
256 * in fs.h, but do so anyway.
257 */
258#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
259#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
260#define MAY_BRINGUP 0x00004000 /* Report use of this rule */
261
262/*
263 * The policy for delivering signals is configurable.
264 * It is usually "write", but can be "append".
265 */
266#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
267#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
268#else
269#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
270#endif
271
272#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
273#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
274#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
275
276/*
277 * Just to make the common cases easier to deal with
278 */
279#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
280#define MAY_READWRITE (MAY_READ | MAY_WRITE)
281#define MAY_NOT 0
282
283/*
284 * Number of access types used by Smack (rwxatlb)
285 */
286#define SMK_NUM_ACCESS_TYPE 7
287
288/* SMACK data */
289struct smack_audit_data {
290 const char *function;
291 char *subject;
292 char *object;
293 char *request;
294 int result;
295};
296
297/*
298 * Smack audit data; is empty if CONFIG_AUDIT not set
299 * to save some stack
300 */
301struct smk_audit_info {
302#ifdef CONFIG_AUDIT
303 struct common_audit_data a;
304 struct smack_audit_data sad;
305#endif
306};
307
308/*
309 * These functions are in smack_access.c
310 */
311int smk_access_entry(char *, char *, struct list_head *);
312int smk_access(struct smack_known *, struct smack_known *,
313 int, struct smk_audit_info *);
314int smk_tskacc(struct task_smack *, struct smack_known *,
315 u32, struct smk_audit_info *);
316int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
317struct smack_known *smack_from_secid(const u32);
318char *smk_parse_smack(const char *string, int len);
319int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
320struct smack_known *smk_import_entry(const char *, int);
321void smk_insert_entry(struct smack_known *skp);
322struct smack_known *smk_find_entry(const char *);
323bool smack_privileged(int cap);
324bool smack_privileged_cred(int cap, const struct cred *cred);
325void smk_destroy_label_list(struct list_head *list);
326
327/*
328 * Shared data.
329 */
330extern int smack_enabled;
331extern int smack_cipso_direct;
332extern int smack_cipso_mapped;
333extern struct smack_known *smack_net_ambient;
334extern struct smack_known *smack_syslog_label;
335#ifdef CONFIG_SECURITY_SMACK_BRINGUP
336extern struct smack_known *smack_unconfined;
337#endif
338extern int smack_ptrace_rule;
339
340extern struct smack_known smack_known_floor;
341extern struct smack_known smack_known_hat;
342extern struct smack_known smack_known_huh;
343extern struct smack_known smack_known_star;
344extern struct smack_known smack_known_web;
345
346extern struct mutex smack_known_lock;
347extern struct list_head smack_known_list;
348extern struct list_head smk_net4addr_list;
349#if IS_ENABLED(CONFIG_IPV6)
350extern struct list_head smk_net6addr_list;
351#endif /* CONFIG_IPV6 */
352
353extern struct mutex smack_onlycap_lock;
354extern struct list_head smack_onlycap_list;
355
356#define SMACK_HASH_SLOTS 16
357extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
358
359/*
360 * Is the directory transmuting?
361 */
362static inline int smk_inode_transmutable(const struct inode *isp)
363{
364 struct inode_smack *sip = isp->i_security;
365 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
366}
367
368/*
369 * Present a pointer to the smack label entry in an inode blob.
370 */
371static inline struct smack_known *smk_of_inode(const struct inode *isp)
372{
373 struct inode_smack *sip = isp->i_security;
374 return sip->smk_inode;
375}
376
377/*
378 * Present a pointer to the smack label entry in an task blob.
379 */
380static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
381{
382 return tsp->smk_task;
383}
384
385static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
386{
387 struct smack_known *skp;
388
389 rcu_read_lock();
390 skp = smk_of_task(__task_cred(t)->security);
391 rcu_read_unlock();
392 return skp;
393}
394
395/*
396 * Present a pointer to the forked smack label entry in an task blob.
397 */
398static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
399{
400 return tsp->smk_forked;
401}
402
403/*
404 * Present a pointer to the smack label in the current task blob.
405 */
406static inline struct smack_known *smk_of_current(void)
407{
408 return smk_of_task(current_security());
409}
410
411/*
412 * logging functions
413 */
414#define SMACK_AUDIT_DENIED 0x1
415#define SMACK_AUDIT_ACCEPT 0x2
416extern int log_policy;
417
418void smack_log(char *subject_label, char *object_label,
419 int request,
420 int result, struct smk_audit_info *auditdata);
421
422#ifdef CONFIG_AUDIT
423
424/*
425 * some inline functions to set up audit data
426 * they do nothing if CONFIG_AUDIT is not set
427 *
428 */
429static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
430 char type)
431{
432 memset(&a->sad, 0, sizeof(a->sad));
433 a->a.type = type;
434 a->a.smack_audit_data = &a->sad;
435 a->a.smack_audit_data->function = func;
436}
437
438static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
439 char type, struct lsm_network_audit *net)
440{
441 smk_ad_init(a, func, type);
442 memset(net, 0, sizeof(*net));
443 a->a.u.net = net;
444}
445
446static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
447 struct task_struct *t)
448{
449 a->a.u.tsk = t;
450}
451static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
452 struct dentry *d)
453{
454 a->a.u.dentry = d;
455}
456static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
457 struct inode *i)
458{
459 a->a.u.inode = i;
460}
461static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
462 struct path p)
463{
464 a->a.u.path = p;
465}
466static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
467 struct sock *sk)
468{
469 a->a.u.net->sk = sk;
470}
471
472#else /* no AUDIT */
473
474static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
475 char type)
476{
477}
478static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
479 struct task_struct *t)
480{
481}
482static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
483 struct dentry *d)
484{
485}
486static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
487 struct vfsmount *m)
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 */
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Author:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 *
11 */
12
13#ifndef _SECURITY_SMACK_H
14#define _SECURITY_SMACK_H
15
16#include <linux/capability.h>
17#include <linux/spinlock.h>
18#include <linux/lsm_hooks.h>
19#include <linux/in.h>
20#if IS_ENABLED(CONFIG_IPV6)
21#include <linux/in6.h>
22#endif /* CONFIG_IPV6 */
23#include <net/netlabel.h>
24#include <linux/list.h>
25#include <linux/rculist.h>
26#include <linux/lsm_audit.h>
27
28/*
29 * Use IPv6 port labeling if IPv6 is enabled and secmarks
30 * are not being used.
31 */
32#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
33#define SMACK_IPV6_PORT_LABELING 1
34#endif
35
36#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
37#define SMACK_IPV6_SECMARK_LABELING 1
38#endif
39
40/*
41 * Smack labels were limited to 23 characters for a long time.
42 */
43#define SMK_LABELLEN 24
44#define SMK_LONGLABEL 256
45
46/*
47 * This is the repository for labels seen so that it is
48 * not necessary to keep allocating tiny chuncks of memory
49 * and so that they can be shared.
50 *
51 * Labels are never modified in place. Anytime a label
52 * is imported (e.g. xattrset on a file) the list is checked
53 * for it and it is added if it doesn't exist. The address
54 * is passed out in either case. Entries are added, but
55 * never deleted.
56 *
57 * Since labels are hanging around anyway it doesn't
58 * hurt to maintain a secid for those awkward situations
59 * where kernel components that ought to use LSM independent
60 * interfaces don't. The secid should go away when all of
61 * these components have been repaired.
62 *
63 * The cipso value associated with the label gets stored here, too.
64 *
65 * Keep the access rules for this subject label here so that
66 * the entire set of rules does not need to be examined every
67 * time.
68 */
69struct smack_known {
70 struct list_head list;
71 struct hlist_node smk_hashed;
72 char *smk_known;
73 u32 smk_secid;
74 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
75 struct list_head smk_rules; /* access rules */
76 struct mutex smk_rules_lock; /* lock for rules */
77};
78
79/*
80 * Maximum number of bytes for the levels in a CIPSO IP option.
81 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
82 * bigger than can be used, and 24 is the next lower multiple
83 * of 8, and there are too many issues if there isn't space set
84 * aside for the terminating null byte.
85 */
86#define SMK_CIPSOLEN 24
87
88struct superblock_smack {
89 struct smack_known *smk_root;
90 struct smack_known *smk_floor;
91 struct smack_known *smk_hat;
92 struct smack_known *smk_default;
93 int smk_flags;
94};
95
96/*
97 * Superblock flags
98 */
99#define SMK_SB_INITIALIZED 0x01
100#define SMK_SB_UNTRUSTED 0x02
101
102struct socket_smack {
103 struct smack_known *smk_out; /* outbound label */
104 struct smack_known *smk_in; /* inbound label */
105 struct smack_known *smk_packet; /* TCP peer label */
106};
107
108/*
109 * Inode smack data
110 */
111struct inode_smack {
112 struct smack_known *smk_inode; /* label of the fso */
113 struct smack_known *smk_task; /* label of the task */
114 struct smack_known *smk_mmap; /* label of the mmap domain */
115 struct mutex smk_lock; /* initialization lock */
116 int smk_flags; /* smack inode flags */
117};
118
119struct task_smack {
120 struct smack_known *smk_task; /* label for access control */
121 struct smack_known *smk_forked; /* label when forked */
122 struct list_head smk_rules; /* per task access rules */
123 struct mutex smk_rules_lock; /* lock for the rules */
124 struct list_head smk_relabel; /* transit allowed labels */
125};
126
127#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
128#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
129#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
130#define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
131
132/*
133 * A label access rule.
134 */
135struct smack_rule {
136 struct list_head list;
137 struct smack_known *smk_subject;
138 struct smack_known *smk_object;
139 int smk_access;
140};
141
142/*
143 * An entry in the table identifying IPv4 hosts.
144 */
145struct smk_net4addr {
146 struct list_head list;
147 struct in_addr smk_host; /* network address */
148 struct in_addr smk_mask; /* network mask */
149 int smk_masks; /* mask size */
150 struct smack_known *smk_label; /* label */
151};
152
153#if IS_ENABLED(CONFIG_IPV6)
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#endif /* CONFIG_IPV6 */
165
166#ifdef SMACK_IPV6_PORT_LABELING
167/*
168 * An entry in the table identifying ports.
169 */
170struct smk_port_label {
171 struct list_head list;
172 struct sock *smk_sock; /* socket initialized on */
173 unsigned short smk_port; /* the port number */
174 struct smack_known *smk_in; /* inbound label */
175 struct smack_known *smk_out; /* outgoing label */
176};
177#endif /* SMACK_IPV6_PORT_LABELING */
178
179struct smack_known_list_elem {
180 struct list_head list;
181 struct smack_known *smk_label;
182};
183
184/* Super block security struct flags for mount options */
185#define FSDEFAULT_MNT 0x01
186#define FSFLOOR_MNT 0x02
187#define FSHAT_MNT 0x04
188#define FSROOT_MNT 0x08
189#define FSTRANS_MNT 0x10
190
191#define NUM_SMK_MNT_OPTS 5
192
193enum {
194 Opt_error = -1,
195 Opt_fsdefault = 1,
196 Opt_fsfloor = 2,
197 Opt_fshat = 3,
198 Opt_fsroot = 4,
199 Opt_fstransmute = 5,
200};
201
202/*
203 * Mount options
204 */
205#define SMK_FSDEFAULT "smackfsdef="
206#define SMK_FSFLOOR "smackfsfloor="
207#define SMK_FSHAT "smackfshat="
208#define SMK_FSROOT "smackfsroot="
209#define SMK_FSTRANS "smackfstransmute="
210
211#define SMACK_DELETE_OPTION "-DELETE"
212#define SMACK_CIPSO_OPTION "-CIPSO"
213
214/*
215 * How communications on this socket are treated.
216 * Usually it's determined by the underlying netlabel code
217 * but there are certain cases, including single label hosts
218 * and potentially single label interfaces for which the
219 * treatment can not be known in advance.
220 *
221 * The possibility of additional labeling schemes being
222 * introduced in the future exists as well.
223 */
224#define SMACK_UNLABELED_SOCKET 0
225#define SMACK_CIPSO_SOCKET 1
226
227/*
228 * CIPSO defaults.
229 */
230#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
231#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
232#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
233#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
234#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
235/*
236 * CIPSO 2.2 standard is 239, but Smack wants to use the
237 * categories in a structured way that limits the value to
238 * the bits in 23 bytes, hence the unusual number.
239 */
240#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
241
242/*
243 * Ptrace rules
244 */
245#define SMACK_PTRACE_DEFAULT 0
246#define SMACK_PTRACE_EXACT 1
247#define SMACK_PTRACE_DRACONIAN 2
248#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
249
250/*
251 * Flags for untraditional access modes.
252 * It shouldn't be necessary to avoid conflicts with definitions
253 * in fs.h, but do so anyway.
254 */
255#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
256#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
257#define MAY_BRINGUP 0x00004000 /* Report use of this rule */
258
259/*
260 * The policy for delivering signals is configurable.
261 * It is usually "write", but can be "append".
262 */
263#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
264#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
265#else
266#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
267#endif
268
269#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
270#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
271#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
272
273/*
274 * Just to make the common cases easier to deal with
275 */
276#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
277#define MAY_READWRITE (MAY_READ | MAY_WRITE)
278#define MAY_NOT 0
279
280/*
281 * Number of access types used by Smack (rwxatlb)
282 */
283#define SMK_NUM_ACCESS_TYPE 7
284
285/* SMACK data */
286struct smack_audit_data {
287 const char *function;
288 char *subject;
289 char *object;
290 char *request;
291 int result;
292};
293
294/*
295 * Smack audit data; is empty if CONFIG_AUDIT not set
296 * to save some stack
297 */
298struct smk_audit_info {
299#ifdef CONFIG_AUDIT
300 struct common_audit_data a;
301 struct smack_audit_data sad;
302#endif
303};
304
305/*
306 * These functions are in smack_access.c
307 */
308int smk_access_entry(char *, char *, struct list_head *);
309int smk_access(struct smack_known *, struct smack_known *,
310 int, struct smk_audit_info *);
311int smk_tskacc(struct task_smack *, struct smack_known *,
312 u32, struct smk_audit_info *);
313int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
314struct smack_known *smack_from_secid(const u32);
315char *smk_parse_smack(const char *string, int len);
316int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
317struct smack_known *smk_import_entry(const char *, int);
318void smk_insert_entry(struct smack_known *skp);
319struct smack_known *smk_find_entry(const char *);
320int smack_privileged(int cap);
321void smk_destroy_label_list(struct list_head *list);
322
323/*
324 * Shared data.
325 */
326extern int smack_enabled;
327extern int smack_cipso_direct;
328extern int smack_cipso_mapped;
329extern struct smack_known *smack_net_ambient;
330extern struct smack_known *smack_syslog_label;
331#ifdef CONFIG_SECURITY_SMACK_BRINGUP
332extern struct smack_known *smack_unconfined;
333#endif
334extern int smack_ptrace_rule;
335
336extern struct smack_known smack_known_floor;
337extern struct smack_known smack_known_hat;
338extern struct smack_known smack_known_huh;
339extern struct smack_known smack_known_star;
340extern struct smack_known smack_known_web;
341
342extern struct mutex smack_known_lock;
343extern struct list_head smack_known_list;
344extern struct list_head smk_net4addr_list;
345#if IS_ENABLED(CONFIG_IPV6)
346extern struct list_head smk_net6addr_list;
347#endif /* CONFIG_IPV6 */
348
349extern struct mutex smack_onlycap_lock;
350extern struct list_head smack_onlycap_list;
351
352#define SMACK_HASH_SLOTS 16
353extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
354
355/*
356 * Is the directory transmuting?
357 */
358static inline int smk_inode_transmutable(const struct inode *isp)
359{
360 struct inode_smack *sip = isp->i_security;
361 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
362}
363
364/*
365 * Present a pointer to the smack label entry in an inode blob.
366 */
367static inline struct smack_known *smk_of_inode(const struct inode *isp)
368{
369 struct inode_smack *sip = isp->i_security;
370 return sip->smk_inode;
371}
372
373/*
374 * Present a pointer to the smack label entry in an task blob.
375 */
376static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
377{
378 return tsp->smk_task;
379}
380
381static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
382{
383 struct smack_known *skp;
384
385 rcu_read_lock();
386 skp = smk_of_task(__task_cred(t)->security);
387 rcu_read_unlock();
388 return skp;
389}
390
391/*
392 * Present a pointer to the forked smack label entry in an task blob.
393 */
394static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
395{
396 return tsp->smk_forked;
397}
398
399/*
400 * Present a pointer to the smack label in the current task blob.
401 */
402static inline struct smack_known *smk_of_current(void)
403{
404 return smk_of_task(current_security());
405}
406
407/*
408 * logging functions
409 */
410#define SMACK_AUDIT_DENIED 0x1
411#define SMACK_AUDIT_ACCEPT 0x2
412extern int log_policy;
413
414void smack_log(char *subject_label, char *object_label,
415 int request,
416 int result, struct smk_audit_info *auditdata);
417
418#ifdef CONFIG_AUDIT
419
420/*
421 * some inline functions to set up audit data
422 * they do nothing if CONFIG_AUDIT is not set
423 *
424 */
425static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
426 char type)
427{
428 memset(&a->sad, 0, sizeof(a->sad));
429 a->a.type = type;
430 a->a.smack_audit_data = &a->sad;
431 a->a.smack_audit_data->function = func;
432}
433
434static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
435 char type, struct lsm_network_audit *net)
436{
437 smk_ad_init(a, func, type);
438 memset(net, 0, sizeof(*net));
439 a->a.u.net = net;
440}
441
442static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
443 struct task_struct *t)
444{
445 a->a.u.tsk = t;
446}
447static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
448 struct dentry *d)
449{
450 a->a.u.dentry = d;
451}
452static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
453 struct inode *i)
454{
455 a->a.u.inode = i;
456}
457static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
458 struct path p)
459{
460 a->a.u.path = p;
461}
462static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
463 struct sock *sk)
464{
465 a->a.u.net->sk = sk;
466}
467
468#else /* no AUDIT */
469
470static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
471 char type)
472{
473}
474static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
475 struct task_struct *t)
476{
477}
478static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
479 struct dentry *d)
480{
481}
482static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
483 struct vfsmount *m)
484{
485}
486static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
487 struct inode *i)
488{
489}
490static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
491 struct path p)
492{
493}
494static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
495 struct sock *sk)
496{
497}
498#endif
499
500#endif /* _SECURITY_SMACK_H */