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Casey Schauflere114e472008-02-04 22:29:50 -08001/*
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>
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +020018#include <linux/security.h>
Casey Schaufler6d3dc072008-12-31 12:54:12 -050019#include <linux/in.h>
Casey Schauflere114e472008-02-04 22:29:50 -080020#include <net/netlabel.h>
Etienne Basset7198e2e2009-03-24 20:53:24 +010021#include <linux/list.h>
22#include <linux/rculist.h>
Etienne Bassetecfcc532009-04-08 20:40:06 +020023#include <linux/lsm_audit.h>
Casey Schauflere114e472008-02-04 22:29:50 -080024
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
Casey Schauflere114e472008-02-04 22:29:50 -080034struct 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 struct mutex smk_lock; /* initialization lock */
55 int smk_flags; /* smack inode flags */
56};
57
58#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
59
60/*
61 * A label access rule.
62 */
63struct smack_rule {
Etienne Basset7198e2e2009-03-24 20:53:24 +010064 struct list_head list;
65 char *smk_subject;
66 char *smk_object;
67 int smk_access;
Casey Schauflere114e472008-02-04 22:29:50 -080068};
69
70/*
71 * An entry in the table mapping smack values to
72 * CIPSO level/category-set values.
73 */
74struct smack_cipso {
75 int smk_level;
76 char smk_catset[SMK_LABELLEN];
77};
78
79/*
Casey Schaufler6d3dc072008-12-31 12:54:12 -050080 * An entry in the table identifying hosts.
81 */
82struct smk_netlbladdr {
Etienne Basset7198e2e2009-03-24 20:53:24 +010083 struct list_head list;
Casey Schaufler6d3dc072008-12-31 12:54:12 -050084 struct sockaddr_in smk_host; /* network address */
85 struct in_addr smk_mask; /* network mask */
86 char *smk_label; /* label */
87};
88
89/*
Casey Schauflere114e472008-02-04 22:29:50 -080090 * This is the repository for labels seen so that it is
91 * not necessary to keep allocating tiny chuncks of memory
92 * and so that they can be shared.
93 *
94 * Labels are never modified in place. Anytime a label
95 * is imported (e.g. xattrset on a file) the list is checked
96 * for it and it is added if it doesn't exist. The address
97 * is passed out in either case. Entries are added, but
98 * never deleted.
99 *
100 * Since labels are hanging around anyway it doesn't
101 * hurt to maintain a secid for those awkward situations
102 * where kernel components that ought to use LSM independent
103 * interfaces don't. The secid should go away when all of
104 * these components have been repaired.
105 *
106 * If there is a cipso value associated with the label it
107 * gets stored here, too. This will most likely be rare as
108 * the cipso direct mapping in used internally.
109 */
110struct smack_known {
Etienne Basset7198e2e2009-03-24 20:53:24 +0100111 struct list_head list;
Casey Schauflere114e472008-02-04 22:29:50 -0800112 char smk_known[SMK_LABELLEN];
113 u32 smk_secid;
114 struct smack_cipso *smk_cipso;
115 spinlock_t smk_cipsolock; /* for changing cipso map */
116};
117
118/*
119 * Mount options
120 */
121#define SMK_FSDEFAULT "smackfsdef="
122#define SMK_FSFLOOR "smackfsfloor="
123#define SMK_FSHAT "smackfshat="
124#define SMK_FSROOT "smackfsroot="
125
126/*
127 * xattr names
128 */
129#define XATTR_SMACK_SUFFIX "SMACK64"
130#define XATTR_SMACK_IPIN "SMACK64IPIN"
131#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
132#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
133#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
134#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
135
Etienne Basset43031542009-03-27 17:11:01 -0400136#define SMACK_CIPSO_OPTION "-CIPSO"
137
Casey Schauflere114e472008-02-04 22:29:50 -0800138/*
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500139 * 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
Casey Schauflere114e472008-02-04 22:29:50 -0800153 * smackfs macic number
154 */
155#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
156
157/*
158 * A limit on the number of entries in the lists
159 * makes some of the list administration easier.
160 */
161#define SMACK_LIST_MAX 10000
162
163/*
164 * CIPSO defaults.
165 */
166#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500167#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
Casey Schauflere114e472008-02-04 22:29:50 -0800168#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
169#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
170#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
171#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
172
173/*
174 * Just to make the common cases easier to deal with
175 */
176#define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
177#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
178#define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND)
179#define MAY_READWRITE (MAY_READ | MAY_WRITE)
180#define MAY_NOT 0
181
182/*
Etienne Bassetecfcc532009-04-08 20:40:06 +0200183 * Number of access types used by Smack (rwxa)
184 */
185#define SMK_NUM_ACCESS_TYPE 4
186
187/*
188 * Smack audit data; is empty if CONFIG_AUDIT not set
189 * to save some stack
190 */
191struct smk_audit_info {
192#ifdef CONFIG_AUDIT
193 struct common_audit_data a;
194#endif
195};
196/*
Casey Schauflere114e472008-02-04 22:29:50 -0800197 * These functions are in smack_lsm.c
198 */
199struct inode_smack *new_inode_smack(char *);
200
201/*
202 * These functions are in smack_access.c
203 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200204int smk_access(char *, char *, int, struct smk_audit_info *);
205int smk_curacc(char *, u32, struct smk_audit_info *);
Casey Schauflere114e472008-02-04 22:29:50 -0800206int smack_to_cipso(const char *, struct smack_cipso *);
207void smack_from_cipso(u32, char *, char *);
208char *smack_from_secid(const u32);
209char *smk_import(const char *, int);
210struct smack_known *smk_import_entry(const char *, int);
211u32 smack_to_secid(const char *);
212
213/*
214 * Shared data.
215 */
216extern int smack_cipso_direct;
Casey Schauflere114e472008-02-04 22:29:50 -0800217extern char *smack_net_ambient;
Casey Schaufler15446232008-07-30 15:37:11 -0700218extern char *smack_onlycap;
Etienne Basset43031542009-03-27 17:11:01 -0400219extern const char *smack_cipso_option;
Casey Schauflere114e472008-02-04 22:29:50 -0800220
Casey Schauflere114e472008-02-04 22:29:50 -0800221extern struct smack_known smack_known_floor;
222extern struct smack_known smack_known_hat;
223extern struct smack_known smack_known_huh;
224extern struct smack_known smack_known_invalid;
225extern struct smack_known smack_known_star;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500226extern struct smack_known smack_known_web;
Casey Schauflere114e472008-02-04 22:29:50 -0800227
Etienne Basset7198e2e2009-03-24 20:53:24 +0100228extern struct list_head smack_known_list;
229extern struct list_head smack_rule_list;
230extern struct list_head smk_netlbladdr_list;
231
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +0200232extern struct security_operations smack_ops;
Casey Schauflere114e472008-02-04 22:29:50 -0800233
234/*
235 * Stricly for CIPSO level manipulation.
236 * Set the category bit number in a smack label sized buffer.
237 */
238static inline void smack_catset_bit(int cat, char *catsetp)
239{
240 if (cat > SMK_LABELLEN * 8)
241 return;
242
243 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
244}
245
246/*
247 * Present a pointer to the smack label in an inode blob.
248 */
249static inline char *smk_of_inode(const struct inode *isp)
250{
251 struct inode_smack *sip = isp->i_security;
252 return sip->smk_inode;
253}
254
Etienne Bassetecfcc532009-04-08 20:40:06 +0200255/*
256 * logging functions
257 */
258#define SMACK_AUDIT_DENIED 0x1
259#define SMACK_AUDIT_ACCEPT 0x2
260extern int log_policy;
261
262void smack_log(char *subject_label, char *object_label,
263 int request,
264 int result, struct smk_audit_info *auditdata);
265
266#ifdef CONFIG_AUDIT
267
268/*
269 * some inline functions to set up audit data
270 * they do nothing if CONFIG_AUDIT is not set
271 *
272 */
273static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
274 char type)
275{
276 memset(a, 0, sizeof(*a));
277 a->a.type = type;
278 a->a.function = func;
279}
280
281static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
282 struct task_struct *t)
283{
284 a->a.u.tsk = t;
285}
286static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
287 struct dentry *d)
288{
289 a->a.u.fs.path.dentry = d;
290}
291static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
292 struct vfsmount *m)
293{
294 a->a.u.fs.path.mnt = m;
295}
296static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
297 struct inode *i)
298{
299 a->a.u.fs.inode = i;
300}
301static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
302 struct path p)
303{
304 a->a.u.fs.path = p;
305}
306static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
307 struct sock *sk)
308{
309 a->a.u.net.sk = sk;
310}
311
312#else /* no AUDIT */
313
314static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
315 char type)
316{
317}
318static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
319 struct task_struct *t)
320{
321}
322static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
323 struct dentry *d)
324{
325}
326static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
327 struct vfsmount *m)
328{
329}
330static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
331 struct inode *i)
332{
333}
334static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
335 struct path p)
336{
337}
338static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
339 struct sock *sk)
340{
341}
342#endif
343
Casey Schauflere114e472008-02-04 22:29:50 -0800344#endif /* _SECURITY_SMACK_H */