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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
183/* Super block security struct flags for mount options */
184#define FSDEFAULT_MNT 0x01
185#define FSFLOOR_MNT 0x02
186#define FSHAT_MNT 0x04
187#define FSROOT_MNT 0x08
188#define FSTRANS_MNT 0x10
189
190#define NUM_SMK_MNT_OPTS 5
191
192enum {
193 Opt_error = -1,
194 Opt_fsdefault = 0,
195 Opt_fsfloor = 1,
196 Opt_fshat = 2,
197 Opt_fsroot = 3,
198 Opt_fstransmute = 4,
199};
200
201#define SMACK_DELETE_OPTION "-DELETE"
202#define SMACK_CIPSO_OPTION "-CIPSO"
203
204/*
205 * CIPSO defaults.
206 */
207#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
208#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
209#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
210#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
211#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
212/*
213 * CIPSO 2.2 standard is 239, but Smack wants to use the
214 * categories in a structured way that limits the value to
215 * the bits in 23 bytes, hence the unusual number.
216 */
217#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
218
219/*
220 * Ptrace rules
221 */
222#define SMACK_PTRACE_DEFAULT 0
223#define SMACK_PTRACE_EXACT 1
224#define SMACK_PTRACE_DRACONIAN 2
225#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
226
227/*
228 * Flags for untraditional access modes.
229 * It shouldn't be necessary to avoid conflicts with definitions
230 * in fs.h, but do so anyway.
231 */
232#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
233#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
234#define MAY_BRINGUP 0x00004000 /* Report use of this rule */
235
236/*
237 * The policy for delivering signals is configurable.
238 * It is usually "write", but can be "append".
239 */
240#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
241#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
242#else
243#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
244#endif
245
246#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
247#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
248#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
249
250/*
251 * Just to make the common cases easier to deal with
252 */
253#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
254#define MAY_READWRITE (MAY_READ | MAY_WRITE)
255#define MAY_NOT 0
256
257/*
258 * Number of access types used by Smack (rwxatlb)
259 */
260#define SMK_NUM_ACCESS_TYPE 7
261
262/* SMACK data */
263struct smack_audit_data {
264 const char *function;
265 char *subject;
266 char *object;
267 char *request;
268 int result;
269};
270
271/*
272 * Smack audit data; is empty if CONFIG_AUDIT not set
273 * to save some stack
274 */
275struct smk_audit_info {
276#ifdef CONFIG_AUDIT
277 struct common_audit_data a;
278 struct smack_audit_data sad;
279#endif
280};
281
282/*
283 * These functions are in smack_access.c
284 */
285int smk_access_entry(char *, char *, struct list_head *);
286int smk_access(struct smack_known *, struct smack_known *,
287 int, struct smk_audit_info *);
288int smk_tskacc(struct task_smack *, struct smack_known *,
289 u32, struct smk_audit_info *);
290int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
291struct smack_known *smack_from_secid(const u32);
292char *smk_parse_smack(const char *string, int len);
293int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
294struct smack_known *smk_import_entry(const char *, int);
295void smk_insert_entry(struct smack_known *skp);
296struct smack_known *smk_find_entry(const char *);
297bool smack_privileged(int cap);
298bool smack_privileged_cred(int cap, const struct cred *cred);
299void smk_destroy_label_list(struct list_head *list);
300int smack_populate_secattr(struct smack_known *skp);
301
302/*
303 * Shared data.
304 */
305extern int smack_enabled;
306extern int smack_cipso_direct;
307extern int smack_cipso_mapped;
308extern struct smack_known *smack_net_ambient;
309extern struct smack_known *smack_syslog_label;
310#ifdef CONFIG_SECURITY_SMACK_BRINGUP
311extern struct smack_known *smack_unconfined;
312#endif
313extern int smack_ptrace_rule;
314extern struct lsm_blob_sizes smack_blob_sizes;
315
316extern struct smack_known smack_known_floor;
317extern struct smack_known smack_known_hat;
318extern struct smack_known smack_known_huh;
319extern struct smack_known smack_known_star;
320extern struct smack_known smack_known_web;
321
322extern struct mutex smack_known_lock;
323extern struct list_head smack_known_list;
324extern struct list_head smk_net4addr_list;
325extern struct list_head smk_net6addr_list;
326
327extern struct mutex smack_onlycap_lock;
328extern struct list_head smack_onlycap_list;
329
330#define SMACK_HASH_SLOTS 16
331extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
332extern struct kmem_cache *smack_rule_cache;
333
334static inline struct task_smack *smack_cred(const struct cred *cred)
335{
336 return cred->security + smack_blob_sizes.lbs_cred;
337}
338
339static inline struct smack_known **smack_file(const struct file *file)
340{
341 return (struct smack_known **)(file->f_security +
342 smack_blob_sizes.lbs_file);
343}
344
345static inline struct inode_smack *smack_inode(const struct inode *inode)
346{
347 return inode->i_security + smack_blob_sizes.lbs_inode;
348}
349
350static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
351{
352 return msg->security + smack_blob_sizes.lbs_msg_msg;
353}
354
355static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
356{
357 return ipc->security + smack_blob_sizes.lbs_ipc;
358}
359
360static inline struct superblock_smack *smack_superblock(
361 const struct super_block *superblock)
362{
363 return superblock->s_security + smack_blob_sizes.lbs_superblock;
364}
365
366/*
367 * Is the directory transmuting?
368 */
369static inline int smk_inode_transmutable(const struct inode *isp)
370{
371 struct inode_smack *sip = smack_inode(isp);
372 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
373}
374
375/*
376 * Present a pointer to the smack label entry in an inode blob.
377 */
378static inline struct smack_known *smk_of_inode(const struct inode *isp)
379{
380 struct inode_smack *sip = smack_inode(isp);
381 return sip->smk_inode;
382}
383
384/*
385 * Present a pointer to the smack label entry in an task blob.
386 */
387static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
388{
389 return tsp->smk_task;
390}
391
392static inline struct smack_known *smk_of_task_struct_subj(
393 const struct task_struct *t)
394{
395 struct smack_known *skp;
396 const struct cred *cred;
397
398 rcu_read_lock();
399
400 cred = rcu_dereference(t->cred);
401 skp = smk_of_task(smack_cred(cred));
402
403 rcu_read_unlock();
404
405 return skp;
406}
407
408static inline struct smack_known *smk_of_task_struct_obj(
409 const struct task_struct *t)
410{
411 struct smack_known *skp;
412 const struct cred *cred;
413
414 rcu_read_lock();
415
416 cred = __task_cred(t);
417 skp = smk_of_task(smack_cred(cred));
418
419 rcu_read_unlock();
420
421 return skp;
422}
423
424/*
425 * Present a pointer to the forked smack label entry in an task blob.
426 */
427static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
428{
429 return tsp->smk_forked;
430}
431
432/*
433 * Present a pointer to the smack label in the current task blob.
434 */
435static inline struct smack_known *smk_of_current(void)
436{
437 return smk_of_task(smack_cred(current_cred()));
438}
439
440/*
441 * logging functions
442 */
443#define SMACK_AUDIT_DENIED 0x1
444#define SMACK_AUDIT_ACCEPT 0x2
445extern int log_policy;
446
447void smack_log(char *subject_label, char *object_label,
448 int request,
449 int result, struct smk_audit_info *auditdata);
450
451#ifdef CONFIG_AUDIT
452
453/*
454 * some inline functions to set up audit data
455 * they do nothing if CONFIG_AUDIT is not set
456 *
457 */
458static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
459 char type)
460{
461 memset(&a->sad, 0, sizeof(a->sad));
462 a->a.type = type;
463 a->a.smack_audit_data = &a->sad;
464 a->a.smack_audit_data->function = func;
465}
466
467static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
468 char type, struct lsm_network_audit *net)
469{
470 smk_ad_init(a, func, type);
471 memset(net, 0, sizeof(*net));
472 a->a.u.net = net;
473}
474
475static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
476 struct task_struct *t)
477{
478 a->a.u.tsk = t;
479}
480static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
481 struct dentry *d)
482{
483 a->a.u.dentry = d;
484}
485static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
486 struct inode *i)
487{
488 a->a.u.inode = i;
489}
490static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
491 struct path p)
492{
493 a->a.u.path = p;
494}
495static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
496 struct sock *sk)
497{
498 a->a.u.net->sk = sk;
499}
500
501#else /* no AUDIT */
502
503static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
504 char type)
505{
506}
507static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
508 struct task_struct *t)
509{
510}
511static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
512 struct dentry *d)
513{
514}
515static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
516 struct inode *i)
517{
518}
519static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
520 struct path p)
521{
522}
523static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
524 struct sock *sk)
525{
526}
527#endif
528
529#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};
104
105/*
106 * Inode smack data
107 */
108struct inode_smack {
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 struct mutex smk_lock; /* initialization lock */
113 int smk_flags; /* smack inode flags */
114 struct rcu_head smk_rcu; /* for freeing inode_smack */
115};
116
117struct task_smack {
118 struct smack_known *smk_task; /* label for access control */
119 struct smack_known *smk_forked; /* label when forked */
120 struct list_head smk_rules; /* per task access rules */
121 struct mutex smk_rules_lock; /* lock for the rules */
122 struct list_head smk_relabel; /* transit allowed labels */
123};
124
125#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
126#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
127#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
128#define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
129
130/*
131 * A label access rule.
132 */
133struct smack_rule {
134 struct list_head list;
135 struct smack_known *smk_subject;
136 struct smack_known *smk_object;
137 int smk_access;
138};
139
140/*
141 * An entry in the table identifying IPv4 hosts.
142 */
143struct smk_net4addr {
144 struct list_head list;
145 struct in_addr smk_host; /* network address */
146 struct in_addr smk_mask; /* network mask */
147 int smk_masks; /* mask size */
148 struct smack_known *smk_label; /* label */
149};
150
151#if IS_ENABLED(CONFIG_IPV6)
152/*
153 * An entry in the table identifying IPv6 hosts.
154 */
155struct smk_net6addr {
156 struct list_head list;
157 struct in6_addr smk_host; /* network address */
158 struct in6_addr smk_mask; /* network mask */
159 int smk_masks; /* mask size */
160 struct smack_known *smk_label; /* label */
161};
162#endif /* CONFIG_IPV6 */
163
164#ifdef SMACK_IPV6_PORT_LABELING
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#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 = 0,
196 Opt_fsfloor = 1,
197 Opt_fshat = 2,
198 Opt_fsroot = 3,
199 Opt_fstransmute = 4,
200};
201
202#define SMACK_DELETE_OPTION "-DELETE"
203#define SMACK_CIPSO_OPTION "-CIPSO"
204
205/*
206 * How communications on this socket are treated.
207 * Usually it's determined by the underlying netlabel code
208 * but there are certain cases, including single label hosts
209 * and potentially single label interfaces for which the
210 * treatment can not be known in advance.
211 *
212 * The possibility of additional labeling schemes being
213 * introduced in the future exists as well.
214 */
215#define SMACK_UNLABELED_SOCKET 0
216#define SMACK_CIPSO_SOCKET 1
217
218/*
219 * CIPSO defaults.
220 */
221#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
222#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
223#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
224#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
225#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
226/*
227 * CIPSO 2.2 standard is 239, but Smack wants to use the
228 * categories in a structured way that limits the value to
229 * the bits in 23 bytes, hence the unusual number.
230 */
231#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
232
233/*
234 * Ptrace rules
235 */
236#define SMACK_PTRACE_DEFAULT 0
237#define SMACK_PTRACE_EXACT 1
238#define SMACK_PTRACE_DRACONIAN 2
239#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
240
241/*
242 * Flags for untraditional access modes.
243 * It shouldn't be necessary to avoid conflicts with definitions
244 * in fs.h, but do so anyway.
245 */
246#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
247#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
248#define MAY_BRINGUP 0x00004000 /* Report use of this rule */
249
250/*
251 * The policy for delivering signals is configurable.
252 * It is usually "write", but can be "append".
253 */
254#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
255#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
256#else
257#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
258#endif
259
260#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
261#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
262#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
263
264/*
265 * Just to make the common cases easier to deal with
266 */
267#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
268#define MAY_READWRITE (MAY_READ | MAY_WRITE)
269#define MAY_NOT 0
270
271/*
272 * Number of access types used by Smack (rwxatlb)
273 */
274#define SMK_NUM_ACCESS_TYPE 7
275
276/* SMACK data */
277struct smack_audit_data {
278 const char *function;
279 char *subject;
280 char *object;
281 char *request;
282 int result;
283};
284
285/*
286 * Smack audit data; is empty if CONFIG_AUDIT not set
287 * to save some stack
288 */
289struct smk_audit_info {
290#ifdef CONFIG_AUDIT
291 struct common_audit_data a;
292 struct smack_audit_data sad;
293#endif
294};
295
296/*
297 * These functions are in smack_access.c
298 */
299int smk_access_entry(char *, char *, struct list_head *);
300int smk_access(struct smack_known *, struct smack_known *,
301 int, struct smk_audit_info *);
302int smk_tskacc(struct task_smack *, struct smack_known *,
303 u32, struct smk_audit_info *);
304int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
305struct smack_known *smack_from_secid(const u32);
306char *smk_parse_smack(const char *string, int len);
307int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
308struct smack_known *smk_import_entry(const char *, int);
309void smk_insert_entry(struct smack_known *skp);
310struct smack_known *smk_find_entry(const char *);
311bool smack_privileged(int cap);
312bool smack_privileged_cred(int cap, const struct cred *cred);
313void smk_destroy_label_list(struct list_head *list);
314
315/*
316 * Shared data.
317 */
318extern int smack_enabled;
319extern int smack_cipso_direct;
320extern int smack_cipso_mapped;
321extern struct smack_known *smack_net_ambient;
322extern struct smack_known *smack_syslog_label;
323#ifdef CONFIG_SECURITY_SMACK_BRINGUP
324extern struct smack_known *smack_unconfined;
325#endif
326extern int smack_ptrace_rule;
327extern struct lsm_blob_sizes smack_blob_sizes;
328
329extern struct smack_known smack_known_floor;
330extern struct smack_known smack_known_hat;
331extern struct smack_known smack_known_huh;
332extern struct smack_known smack_known_star;
333extern struct smack_known smack_known_web;
334
335extern struct mutex smack_known_lock;
336extern struct list_head smack_known_list;
337extern struct list_head smk_net4addr_list;
338#if IS_ENABLED(CONFIG_IPV6)
339extern struct list_head smk_net6addr_list;
340#endif /* CONFIG_IPV6 */
341
342extern struct mutex smack_onlycap_lock;
343extern struct list_head smack_onlycap_list;
344
345#define SMACK_HASH_SLOTS 16
346extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
347extern struct kmem_cache *smack_rule_cache;
348
349static inline struct task_smack *smack_cred(const struct cred *cred)
350{
351 return cred->security + smack_blob_sizes.lbs_cred;
352}
353
354static inline struct smack_known **smack_file(const struct file *file)
355{
356 return (struct smack_known **)(file->f_security +
357 smack_blob_sizes.lbs_file);
358}
359
360static inline struct inode_smack *smack_inode(const struct inode *inode)
361{
362 return inode->i_security + smack_blob_sizes.lbs_inode;
363}
364
365static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
366{
367 return msg->security + smack_blob_sizes.lbs_msg_msg;
368}
369
370static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
371{
372 return ipc->security + smack_blob_sizes.lbs_ipc;
373}
374
375/*
376 * Is the directory transmuting?
377 */
378static inline int smk_inode_transmutable(const struct inode *isp)
379{
380 struct inode_smack *sip = smack_inode(isp);
381 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
382}
383
384/*
385 * Present a pointer to the smack label entry in an inode blob.
386 */
387static inline struct smack_known *smk_of_inode(const struct inode *isp)
388{
389 struct inode_smack *sip = smack_inode(isp);
390 return sip->smk_inode;
391}
392
393/*
394 * Present a pointer to the smack label entry in an task blob.
395 */
396static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
397{
398 return tsp->smk_task;
399}
400
401static inline struct smack_known *smk_of_task_struct(
402 const struct task_struct *t)
403{
404 struct smack_known *skp;
405 const struct cred *cred;
406
407 rcu_read_lock();
408
409 cred = __task_cred(t);
410 skp = smk_of_task(smack_cred(cred));
411
412 rcu_read_unlock();
413
414 return skp;
415}
416
417/*
418 * Present a pointer to the forked smack label entry in an task blob.
419 */
420static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
421{
422 return tsp->smk_forked;
423}
424
425/*
426 * Present a pointer to the smack label in the current task blob.
427 */
428static inline struct smack_known *smk_of_current(void)
429{
430 return smk_of_task(smack_cred(current_cred()));
431}
432
433/*
434 * logging functions
435 */
436#define SMACK_AUDIT_DENIED 0x1
437#define SMACK_AUDIT_ACCEPT 0x2
438extern int log_policy;
439
440void smack_log(char *subject_label, char *object_label,
441 int request,
442 int result, struct smk_audit_info *auditdata);
443
444#ifdef CONFIG_AUDIT
445
446/*
447 * some inline functions to set up audit data
448 * they do nothing if CONFIG_AUDIT is not set
449 *
450 */
451static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
452 char type)
453{
454 memset(&a->sad, 0, sizeof(a->sad));
455 a->a.type = type;
456 a->a.smack_audit_data = &a->sad;
457 a->a.smack_audit_data->function = func;
458}
459
460static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
461 char type, struct lsm_network_audit *net)
462{
463 smk_ad_init(a, func, type);
464 memset(net, 0, sizeof(*net));
465 a->a.u.net = net;
466}
467
468static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
469 struct task_struct *t)
470{
471 a->a.u.tsk = t;
472}
473static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
474 struct dentry *d)
475{
476 a->a.u.dentry = d;
477}
478static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
479 struct inode *i)
480{
481 a->a.u.inode = i;
482}
483static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
484 struct path p)
485{
486 a->a.u.path = p;
487}
488static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
489 struct sock *sk)
490{
491 a->a.u.net->sk = sk;
492}
493
494#else /* no AUDIT */
495
496static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
497 char type)
498{
499}
500static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
501 struct task_struct *t)
502{
503}
504static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
505 struct dentry *d)
506{
507}
508static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
509 struct vfsmount *m)
510{
511}
512static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
513 struct inode *i)
514{
515}
516static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
517 struct path p)
518{
519}
520static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
521 struct sock *sk)
522{
523}
524#endif
525
526#endif /* _SECURITY_SMACK_H */