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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/security.h>
19#include <linux/in.h>
20#include <net/netlabel.h>
21#include <linux/list.h>
22#include <linux/rculist.h>
23#include <linux/lsm_audit.h>
24
25/*
26 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
27 * bigger than can be used, and 24 is the next lower multiple
28 * of 8, and there are too many issues if there isn't space set
29 * aside for the terminating null byte.
30 */
31#define SMK_MAXLEN 23
32#define SMK_LABELLEN (SMK_MAXLEN+1)
33
34struct superblock_smack {
35 char *smk_root;
36 char *smk_floor;
37 char *smk_hat;
38 char *smk_default;
39 int smk_initialized;
40 spinlock_t smk_sblock; /* for initialization */
41};
42
43struct socket_smack {
44 char *smk_out; /* outbound label */
45 char *smk_in; /* inbound label */
46 char smk_packet[SMK_LABELLEN]; /* TCP peer label */
47};
48
49/*
50 * Inode smack data
51 */
52struct inode_smack {
53 char *smk_inode; /* label of the fso */
54 char *smk_task; /* label of the task */
55 char *smk_mmap; /* label of the mmap domain */
56 struct mutex smk_lock; /* initialization lock */
57 int smk_flags; /* smack inode flags */
58};
59
60struct task_smack {
61 char *smk_task; /* label for access control */
62 char *smk_forked; /* label when forked */
63 struct list_head smk_rules; /* per task access rules */
64 struct mutex smk_rules_lock; /* lock for the rules */
65};
66
67#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
68#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
69
70/*
71 * A label access rule.
72 */
73struct smack_rule {
74 struct list_head list;
75 char *smk_subject;
76 char *smk_object;
77 int smk_access;
78};
79
80/*
81 * An entry in the table mapping smack values to
82 * CIPSO level/category-set values.
83 */
84struct smack_cipso {
85 int smk_level;
86 char smk_catset[SMK_LABELLEN];
87};
88
89/*
90 * An entry in the table identifying hosts.
91 */
92struct smk_netlbladdr {
93 struct list_head list;
94 struct sockaddr_in smk_host; /* network address */
95 struct in_addr smk_mask; /* network mask */
96 char *smk_label; /* label */
97};
98
99/*
100 * This is the repository for labels seen so that it is
101 * not necessary to keep allocating tiny chuncks of memory
102 * and so that they can be shared.
103 *
104 * Labels are never modified in place. Anytime a label
105 * is imported (e.g. xattrset on a file) the list is checked
106 * for it and it is added if it doesn't exist. The address
107 * is passed out in either case. Entries are added, but
108 * never deleted.
109 *
110 * Since labels are hanging around anyway it doesn't
111 * hurt to maintain a secid for those awkward situations
112 * where kernel components that ought to use LSM independent
113 * interfaces don't. The secid should go away when all of
114 * these components have been repaired.
115 *
116 * If there is a cipso value associated with the label it
117 * gets stored here, too. This will most likely be rare as
118 * the cipso direct mapping in used internally.
119 */
120struct smack_known {
121 struct list_head list;
122 char smk_known[SMK_LABELLEN];
123 u32 smk_secid;
124 struct smack_cipso *smk_cipso;
125 spinlock_t smk_cipsolock; /* for changing cipso map */
126};
127
128/*
129 * Mount options
130 */
131#define SMK_FSDEFAULT "smackfsdef="
132#define SMK_FSFLOOR "smackfsfloor="
133#define SMK_FSHAT "smackfshat="
134#define SMK_FSROOT "smackfsroot="
135
136#define SMACK_CIPSO_OPTION "-CIPSO"
137
138/*
139 * How communications on this socket are treated.
140 * Usually it's determined by the underlying netlabel code
141 * but there are certain cases, including single label hosts
142 * and potentially single label interfaces for which the
143 * treatment can not be known in advance.
144 *
145 * The possibility of additional labeling schemes being
146 * introduced in the future exists as well.
147 */
148#define SMACK_UNLABELED_SOCKET 0
149#define SMACK_CIPSO_SOCKET 1
150
151/*
152 * smackfs magic number
153 * smackfs macic number
154 */
155#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
156
157/*
158 * CIPSO defaults.
159 */
160#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
161#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
162#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
163#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
164#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
165#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
166
167/*
168 * Flag for transmute access
169 */
170#define MAY_TRANSMUTE 64
171/*
172 * Just to make the common cases easier to deal with
173 */
174#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
175#define MAY_READWRITE (MAY_READ | MAY_WRITE)
176#define MAY_NOT 0
177
178/*
179 * Number of access types used by Smack (rwxa)
180 */
181#define SMK_NUM_ACCESS_TYPE 4
182
183/*
184 * Smack audit data; is empty if CONFIG_AUDIT not set
185 * to save some stack
186 */
187struct smk_audit_info {
188#ifdef CONFIG_AUDIT
189 struct common_audit_data a;
190#endif
191};
192/*
193 * These functions are in smack_lsm.c
194 */
195struct inode_smack *new_inode_smack(char *);
196
197/*
198 * These functions are in smack_access.c
199 */
200int smk_access_entry(char *, char *, struct list_head *);
201int smk_access(char *, char *, int, struct smk_audit_info *);
202int smk_curacc(char *, u32, struct smk_audit_info *);
203int smack_to_cipso(const char *, struct smack_cipso *);
204void smack_from_cipso(u32, char *, char *);
205char *smack_from_secid(const u32);
206char *smk_import(const char *, int);
207struct smack_known *smk_import_entry(const char *, int);
208u32 smack_to_secid(const char *);
209
210/*
211 * Shared data.
212 */
213extern int smack_cipso_direct;
214extern char *smack_net_ambient;
215extern char *smack_onlycap;
216extern const char *smack_cipso_option;
217
218extern struct smack_known smack_known_floor;
219extern struct smack_known smack_known_hat;
220extern struct smack_known smack_known_huh;
221extern struct smack_known smack_known_invalid;
222extern struct smack_known smack_known_star;
223extern struct smack_known smack_known_web;
224
225extern struct list_head smack_known_list;
226extern struct list_head smack_rule_list;
227extern struct list_head smk_netlbladdr_list;
228
229extern struct security_operations smack_ops;
230
231/*
232 * Stricly for CIPSO level manipulation.
233 * Set the category bit number in a smack label sized buffer.
234 */
235static inline void smack_catset_bit(int cat, char *catsetp)
236{
237 if (cat > SMK_LABELLEN * 8)
238 return;
239
240 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
241}
242
243/*
244 * Is the directory transmuting?
245 */
246static inline int smk_inode_transmutable(const struct inode *isp)
247{
248 struct inode_smack *sip = isp->i_security;
249 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
250}
251
252/*
253 * Present a pointer to the smack label in an inode blob.
254 */
255static inline char *smk_of_inode(const struct inode *isp)
256{
257 struct inode_smack *sip = isp->i_security;
258 return sip->smk_inode;
259}
260
261/*
262 * Present a pointer to the smack label in an task blob.
263 */
264static inline char *smk_of_task(const struct task_smack *tsp)
265{
266 return tsp->smk_task;
267}
268
269/*
270 * Present a pointer to the forked smack label in an task blob.
271 */
272static inline char *smk_of_forked(const struct task_smack *tsp)
273{
274 return tsp->smk_forked;
275}
276
277/*
278 * Present a pointer to the smack label in the current task blob.
279 */
280static inline char *smk_of_current(void)
281{
282 return smk_of_task(current_security());
283}
284
285/*
286 * logging functions
287 */
288#define SMACK_AUDIT_DENIED 0x1
289#define SMACK_AUDIT_ACCEPT 0x2
290extern int log_policy;
291
292void smack_log(char *subject_label, char *object_label,
293 int request,
294 int result, struct smk_audit_info *auditdata);
295
296#ifdef CONFIG_AUDIT
297
298/*
299 * some inline functions to set up audit data
300 * they do nothing if CONFIG_AUDIT is not set
301 *
302 */
303static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
304 char type)
305{
306 memset(a, 0, sizeof(*a));
307 a->a.type = type;
308 a->a.smack_audit_data.function = func;
309}
310
311static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
312 struct task_struct *t)
313{
314 a->a.u.tsk = t;
315}
316static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
317 struct dentry *d)
318{
319 a->a.u.dentry = d;
320}
321static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
322 struct inode *i)
323{
324 a->a.u.inode = i;
325}
326static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
327 struct path p)
328{
329 a->a.u.path = p;
330}
331static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
332 struct sock *sk)
333{
334 a->a.u.net.sk = sk;
335}
336
337#else /* no AUDIT */
338
339static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
340 char type)
341{
342}
343static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
344 struct task_struct *t)
345{
346}
347static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
348 struct dentry *d)
349{
350}
351static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
352 struct vfsmount *m)
353{
354}
355static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
356 struct inode *i)
357{
358}
359static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
360 struct path p)
361{
362}
363static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
364 struct sock *sk)
365{
366}
367#endif
368
369#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/security.h>
19#include <linux/in.h>
20#include <net/netlabel.h>
21#include <linux/list.h>
22#include <linux/rculist.h>
23#include <linux/lsm_audit.h>
24
25/*
26 * Smack labels were limited to 23 characters for a long time.
27 */
28#define SMK_LABELLEN 24
29#define SMK_LONGLABEL 256
30
31/*
32 * Maximum number of bytes for the levels in a CIPSO IP option.
33 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
34 * bigger than can be used, and 24 is the next lower multiple
35 * of 8, and there are too many issues if there isn't space set
36 * aside for the terminating null byte.
37 */
38#define SMK_CIPSOLEN 24
39
40struct superblock_smack {
41 char *smk_root;
42 char *smk_floor;
43 char *smk_hat;
44 char *smk_default;
45 int smk_initialized;
46 spinlock_t smk_sblock; /* for initialization */
47};
48
49struct socket_smack {
50 char *smk_out; /* outbound label */
51 char *smk_in; /* inbound label */
52 char *smk_packet; /* TCP peer label */
53};
54
55/*
56 * Inode smack data
57 */
58struct inode_smack {
59 char *smk_inode; /* label of the fso */
60 char *smk_task; /* label of the task */
61 char *smk_mmap; /* label of the mmap domain */
62 struct mutex smk_lock; /* initialization lock */
63 int smk_flags; /* smack inode flags */
64};
65
66struct task_smack {
67 char *smk_task; /* label for access control */
68 char *smk_forked; /* label when forked */
69 struct list_head smk_rules; /* per task access rules */
70 struct mutex smk_rules_lock; /* lock for the rules */
71};
72
73#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
74#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
75#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
76
77/*
78 * A label access rule.
79 */
80struct smack_rule {
81 struct list_head list;
82 char *smk_subject;
83 char *smk_object;
84 int smk_access;
85};
86
87/*
88 * An entry in the table identifying hosts.
89 */
90struct smk_netlbladdr {
91 struct list_head list;
92 struct sockaddr_in smk_host; /* network address */
93 struct in_addr smk_mask; /* network mask */
94 char *smk_label; /* label */
95};
96
97/*
98 * This is the repository for labels seen so that it is
99 * not necessary to keep allocating tiny chuncks of memory
100 * and so that they can be shared.
101 *
102 * Labels are never modified in place. Anytime a label
103 * is imported (e.g. xattrset on a file) the list is checked
104 * for it and it is added if it doesn't exist. The address
105 * is passed out in either case. Entries are added, but
106 * never deleted.
107 *
108 * Since labels are hanging around anyway it doesn't
109 * hurt to maintain a secid for those awkward situations
110 * where kernel components that ought to use LSM independent
111 * interfaces don't. The secid should go away when all of
112 * these components have been repaired.
113 *
114 * The cipso value associated with the label gets stored here, too.
115 *
116 * Keep the access rules for this subject label here so that
117 * the entire set of rules does not need to be examined every
118 * time.
119 */
120struct smack_known {
121 struct list_head list;
122 char *smk_known;
123 u32 smk_secid;
124 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
125 struct list_head smk_rules; /* access rules */
126 struct mutex smk_rules_lock; /* lock for rules */
127};
128
129/*
130 * Mount options
131 */
132#define SMK_FSDEFAULT "smackfsdef="
133#define SMK_FSFLOOR "smackfsfloor="
134#define SMK_FSHAT "smackfshat="
135#define SMK_FSROOT "smackfsroot="
136
137#define SMACK_CIPSO_OPTION "-CIPSO"
138
139/*
140 * How communications on this socket are treated.
141 * Usually it's determined by the underlying netlabel code
142 * but there are certain cases, including single label hosts
143 * and potentially single label interfaces for which the
144 * treatment can not be known in advance.
145 *
146 * The possibility of additional labeling schemes being
147 * introduced in the future exists as well.
148 */
149#define SMACK_UNLABELED_SOCKET 0
150#define SMACK_CIPSO_SOCKET 1
151
152/*
153 * smackfs magic number
154 */
155#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
156
157/*
158 * CIPSO defaults.
159 */
160#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
161#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
162#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
163#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
164#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
165#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
166#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
167
168/*
169 * Flag for transmute access
170 */
171#define MAY_TRANSMUTE 64
172/*
173 * Just to make the common cases easier to deal with
174 */
175#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
176#define MAY_READWRITE (MAY_READ | MAY_WRITE)
177#define MAY_NOT 0
178
179/*
180 * Number of access types used by Smack (rwxat)
181 */
182#define SMK_NUM_ACCESS_TYPE 5
183
184/* SMACK data */
185struct smack_audit_data {
186 const char *function;
187 char *subject;
188 char *object;
189 char *request;
190 int result;
191};
192
193/*
194 * Smack audit data; is empty if CONFIG_AUDIT not set
195 * to save some stack
196 */
197struct smk_audit_info {
198#ifdef CONFIG_AUDIT
199 struct common_audit_data a;
200 struct smack_audit_data sad;
201#endif
202};
203/*
204 * These functions are in smack_lsm.c
205 */
206struct inode_smack *new_inode_smack(char *);
207
208/*
209 * These functions are in smack_access.c
210 */
211int smk_access_entry(char *, char *, struct list_head *);
212int smk_access(char *, char *, int, struct smk_audit_info *);
213int smk_curacc(char *, u32, struct smk_audit_info *);
214char *smack_from_secid(const u32);
215char *smk_parse_smack(const char *string, int len);
216int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
217char *smk_import(const char *, int);
218struct smack_known *smk_import_entry(const char *, int);
219struct smack_known *smk_find_entry(const char *);
220u32 smack_to_secid(const char *);
221
222/*
223 * Shared data.
224 */
225extern int smack_cipso_direct;
226extern int smack_cipso_mapped;
227extern char *smack_net_ambient;
228extern char *smack_onlycap;
229extern const char *smack_cipso_option;
230
231extern struct smack_known smack_known_floor;
232extern struct smack_known smack_known_hat;
233extern struct smack_known smack_known_huh;
234extern struct smack_known smack_known_invalid;
235extern struct smack_known smack_known_star;
236extern struct smack_known smack_known_web;
237
238extern struct mutex smack_known_lock;
239extern struct list_head smack_known_list;
240extern struct list_head smk_netlbladdr_list;
241
242extern struct security_operations smack_ops;
243
244/*
245 * Is the directory transmuting?
246 */
247static inline int smk_inode_transmutable(const struct inode *isp)
248{
249 struct inode_smack *sip = isp->i_security;
250 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
251}
252
253/*
254 * Present a pointer to the smack label in an inode blob.
255 */
256static inline char *smk_of_inode(const struct inode *isp)
257{
258 struct inode_smack *sip = isp->i_security;
259 return sip->smk_inode;
260}
261
262/*
263 * Present a pointer to the smack label in an task blob.
264 */
265static inline char *smk_of_task(const struct task_smack *tsp)
266{
267 return tsp->smk_task;
268}
269
270/*
271 * Present a pointer to the forked smack label in an task blob.
272 */
273static inline char *smk_of_forked(const struct task_smack *tsp)
274{
275 return tsp->smk_forked;
276}
277
278/*
279 * Present a pointer to the smack label in the current task blob.
280 */
281static inline char *smk_of_current(void)
282{
283 return smk_of_task(current_security());
284}
285
286/*
287 * logging functions
288 */
289#define SMACK_AUDIT_DENIED 0x1
290#define SMACK_AUDIT_ACCEPT 0x2
291extern int log_policy;
292
293void smack_log(char *subject_label, char *object_label,
294 int request,
295 int result, struct smk_audit_info *auditdata);
296
297#ifdef CONFIG_AUDIT
298
299/*
300 * some inline functions to set up audit data
301 * they do nothing if CONFIG_AUDIT is not set
302 *
303 */
304static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
305 char type)
306{
307 memset(&a->sad, 0, sizeof(a->sad));
308 a->a.type = type;
309 a->a.smack_audit_data = &a->sad;
310 a->a.smack_audit_data->function = func;
311}
312
313static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
314 char type, struct lsm_network_audit *net)
315{
316 smk_ad_init(a, func, type);
317 memset(net, 0, sizeof(*net));
318 a->a.u.net = net;
319}
320
321static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
322 struct task_struct *t)
323{
324 a->a.u.tsk = t;
325}
326static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
327 struct dentry *d)
328{
329 a->a.u.dentry = d;
330}
331static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
332 struct inode *i)
333{
334 a->a.u.inode = i;
335}
336static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
337 struct path p)
338{
339 a->a.u.path = p;
340}
341static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
342 struct sock *sk)
343{
344 a->a.u.net->sk = sk;
345}
346
347#else /* no AUDIT */
348
349static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
350 char type)
351{
352}
353static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
354 struct task_struct *t)
355{
356}
357static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
358 struct dentry *d)
359{
360}
361static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
362 struct vfsmount *m)
363{
364}
365static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
366 struct inode *i)
367{
368}
369static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
370 struct path p)
371{
372}
373static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
374 struct sock *sk)
375{
376}
377#endif
378
379#endif /* _SECURITY_SMACK_H */