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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/* 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 */