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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 {
Casey Schaufler272cd7a2011-09-20 12:24:36 -070044 char *smk_out; /* outbound label */
45 char *smk_in; /* inbound label */
46 char *smk_packet; /* TCP peer label */
Casey Schauflere114e472008-02-04 22:29:50 -080047};
48
49/*
50 * Inode smack data
51 */
52struct inode_smack {
53 char *smk_inode; /* label of the fso */
Casey Schaufler676dac42010-12-02 06:43:39 -080054 char *smk_task; /* label of the task */
Casey Schaufler7898e1f2011-01-17 08:05:27 -080055 char *smk_mmap; /* label of the mmap domain */
Casey Schauflere114e472008-02-04 22:29:50 -080056 struct mutex smk_lock; /* initialization lock */
57 int smk_flags; /* smack inode flags */
58};
59
Casey Schaufler676dac42010-12-02 06:43:39 -080060struct task_smack {
Casey Schaufler7898e1f2011-01-17 08:05:27 -080061 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 */
Casey Schaufler676dac42010-12-02 06:43:39 -080065};
66
Casey Schauflere114e472008-02-04 22:29:50 -080067#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +020068#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
Casey Schauflere114e472008-02-04 22:29:50 -080069
70/*
71 * A label access rule.
72 */
73struct smack_rule {
Etienne Basset7198e2e2009-03-24 20:53:24 +010074 struct list_head list;
75 char *smk_subject;
76 char *smk_object;
77 int smk_access;
Casey Schauflere114e472008-02-04 22:29:50 -080078};
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/*
Casey Schaufler6d3dc072008-12-31 12:54:12 -050090 * An entry in the table identifying hosts.
91 */
92struct smk_netlbladdr {
Etienne Basset7198e2e2009-03-24 20:53:24 +010093 struct list_head list;
Casey Schaufler6d3dc072008-12-31 12:54:12 -050094 struct sockaddr_in smk_host; /* network address */
95 struct in_addr smk_mask; /* network mask */
96 char *smk_label; /* label */
97};
98
99/*
Casey Schauflere114e472008-02-04 22:29:50 -0800100 * 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.
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700119 *
120 * Keep the access rules for this subject label here so that
121 * the entire set of rules does not need to be examined every
122 * time.
Casey Schauflere114e472008-02-04 22:29:50 -0800123 */
124struct smack_known {
Etienne Basset7198e2e2009-03-24 20:53:24 +0100125 struct list_head list;
Casey Schauflere114e472008-02-04 22:29:50 -0800126 char smk_known[SMK_LABELLEN];
127 u32 smk_secid;
128 struct smack_cipso *smk_cipso;
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700129 spinlock_t smk_cipsolock; /* for changing cipso map */
130 struct list_head smk_rules; /* access rules */
131 struct mutex smk_rules_lock; /* lock for the rules */
Casey Schauflere114e472008-02-04 22:29:50 -0800132};
133
134/*
135 * Mount options
136 */
137#define SMK_FSDEFAULT "smackfsdef="
138#define SMK_FSFLOOR "smackfsfloor="
139#define SMK_FSHAT "smackfshat="
140#define SMK_FSROOT "smackfsroot="
141
Etienne Basset43031542009-03-27 17:11:01 -0400142#define SMACK_CIPSO_OPTION "-CIPSO"
143
Casey Schauflere114e472008-02-04 22:29:50 -0800144/*
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500145 * How communications on this socket are treated.
146 * Usually it's determined by the underlying netlabel code
147 * but there are certain cases, including single label hosts
148 * and potentially single label interfaces for which the
149 * treatment can not be known in advance.
150 *
151 * The possibility of additional labeling schemes being
152 * introduced in the future exists as well.
153 */
154#define SMACK_UNLABELED_SOCKET 0
155#define SMACK_CIPSO_SOCKET 1
156
157/*
158 * smackfs magic number
Casey Schauflere114e472008-02-04 22:29:50 -0800159 */
160#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
161
162/*
Casey Schauflere114e472008-02-04 22:29:50 -0800163 * CIPSO defaults.
164 */
165#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500166#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
Casey Schauflere114e472008-02-04 22:29:50 -0800167#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
168#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
169#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
170#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
171
172/*
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200173 * Flag for transmute access
174 */
175#define MAY_TRANSMUTE 64
176/*
Casey Schauflere114e472008-02-04 22:29:50 -0800177 * Just to make the common cases easier to deal with
178 */
Casey Schauflere114e472008-02-04 22:29:50 -0800179#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
Casey Schauflere114e472008-02-04 22:29:50 -0800180#define MAY_READWRITE (MAY_READ | MAY_WRITE)
181#define MAY_NOT 0
182
183/*
Casey Schauflerce8a4322011-09-29 18:21:01 -0700184 * Number of access types used by Smack (rwxat)
Etienne Bassetecfcc532009-04-08 20:40:06 +0200185 */
Casey Schauflerce8a4322011-09-29 18:21:01 -0700186#define SMK_NUM_ACCESS_TYPE 5
Etienne Bassetecfcc532009-04-08 20:40:06 +0200187
Eric Paris3b3b0e42012-04-03 09:37:02 -0700188/* SMACK data */
189struct smack_audit_data {
190 const char *function;
191 char *subject;
192 char *object;
193 char *request;
194 int result;
195};
196
Etienne Bassetecfcc532009-04-08 20:40:06 +0200197/*
198 * Smack audit data; is empty if CONFIG_AUDIT not set
199 * to save some stack
200 */
201struct smk_audit_info {
202#ifdef CONFIG_AUDIT
203 struct common_audit_data a;
Eric Paris3b3b0e42012-04-03 09:37:02 -0700204 struct smack_audit_data sad;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200205#endif
206};
207/*
Casey Schauflere114e472008-02-04 22:29:50 -0800208 * These functions are in smack_lsm.c
209 */
210struct inode_smack *new_inode_smack(char *);
211
212/*
213 * These functions are in smack_access.c
214 */
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800215int smk_access_entry(char *, char *, struct list_head *);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200216int smk_access(char *, char *, int, struct smk_audit_info *);
217int smk_curacc(char *, u32, struct smk_audit_info *);
Casey Schauflere114e472008-02-04 22:29:50 -0800218int smack_to_cipso(const char *, struct smack_cipso *);
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700219char *smack_from_cipso(u32, char *);
Casey Schauflere114e472008-02-04 22:29:50 -0800220char *smack_from_secid(const u32);
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300221void smk_parse_smack(const char *string, int len, char *smack);
Casey Schauflere114e472008-02-04 22:29:50 -0800222char *smk_import(const char *, int);
223struct smack_known *smk_import_entry(const char *, int);
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700224struct smack_known *smk_find_entry(const char *);
Casey Schauflere114e472008-02-04 22:29:50 -0800225u32 smack_to_secid(const char *);
226
227/*
228 * Shared data.
229 */
230extern int smack_cipso_direct;
Casey Schauflere114e472008-02-04 22:29:50 -0800231extern char *smack_net_ambient;
Casey Schaufler15446232008-07-30 15:37:11 -0700232extern char *smack_onlycap;
Etienne Basset43031542009-03-27 17:11:01 -0400233extern const char *smack_cipso_option;
Casey Schauflere114e472008-02-04 22:29:50 -0800234
Casey Schauflere114e472008-02-04 22:29:50 -0800235extern struct smack_known smack_known_floor;
236extern struct smack_known smack_known_hat;
237extern struct smack_known smack_known_huh;
238extern struct smack_known smack_known_invalid;
239extern struct smack_known smack_known_star;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500240extern struct smack_known smack_known_web;
Casey Schauflere114e472008-02-04 22:29:50 -0800241
Etienne Basset7198e2e2009-03-24 20:53:24 +0100242extern struct list_head smack_known_list;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100243extern struct list_head smk_netlbladdr_list;
244
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +0200245extern struct security_operations smack_ops;
Casey Schauflere114e472008-02-04 22:29:50 -0800246
247/*
248 * Stricly for CIPSO level manipulation.
249 * Set the category bit number in a smack label sized buffer.
250 */
251static inline void smack_catset_bit(int cat, char *catsetp)
252{
253 if (cat > SMK_LABELLEN * 8)
254 return;
255
256 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
257}
258
259/*
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200260 * Is the directory transmuting?
261 */
262static inline int smk_inode_transmutable(const struct inode *isp)
263{
264 struct inode_smack *sip = isp->i_security;
265 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
266}
267
268/*
Casey Schauflere114e472008-02-04 22:29:50 -0800269 * Present a pointer to the smack label in an inode blob.
270 */
271static inline char *smk_of_inode(const struct inode *isp)
272{
273 struct inode_smack *sip = isp->i_security;
274 return sip->smk_inode;
275}
276
Etienne Bassetecfcc532009-04-08 20:40:06 +0200277/*
Casey Schaufler676dac42010-12-02 06:43:39 -0800278 * Present a pointer to the smack label in an task blob.
279 */
280static inline char *smk_of_task(const struct task_smack *tsp)
281{
282 return tsp->smk_task;
283}
284
285/*
286 * Present a pointer to the forked smack label in an task blob.
287 */
288static inline char *smk_of_forked(const struct task_smack *tsp)
289{
290 return tsp->smk_forked;
291}
292
293/*
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200294 * Present a pointer to the smack label in the current task blob.
Casey Schaufler676dac42010-12-02 06:43:39 -0800295 */
296static inline char *smk_of_current(void)
297{
298 return smk_of_task(current_security());
299}
300
301/*
Etienne Bassetecfcc532009-04-08 20:40:06 +0200302 * logging functions
303 */
304#define SMACK_AUDIT_DENIED 0x1
305#define SMACK_AUDIT_ACCEPT 0x2
306extern int log_policy;
307
308void smack_log(char *subject_label, char *object_label,
309 int request,
310 int result, struct smk_audit_info *auditdata);
311
312#ifdef CONFIG_AUDIT
313
314/*
315 * some inline functions to set up audit data
316 * they do nothing if CONFIG_AUDIT is not set
317 *
318 */
319static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
320 char type)
321{
322 memset(a, 0, sizeof(*a));
323 a->a.type = type;
Eric Paris3b3b0e42012-04-03 09:37:02 -0700324 a->a.smack_audit_data = &a->sad;
325 a->a.smack_audit_data->function = func;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200326}
327
Eric Paris48c62af2012-04-02 13:15:44 -0400328static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
329 char type, struct lsm_network_audit *net)
330{
331 smk_ad_init(a, func, type);
332 memset(net, 0, sizeof(*net));
333 a->a.u.net = net;
334}
335
Etienne Bassetecfcc532009-04-08 20:40:06 +0200336static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
337 struct task_struct *t)
338{
339 a->a.u.tsk = t;
340}
341static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
342 struct dentry *d)
343{
Eric Parisa2694342011-04-25 13:10:27 -0400344 a->a.u.dentry = d;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200345}
346static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
347 struct inode *i)
348{
Eric Parisf48b7392011-04-25 12:54:27 -0400349 a->a.u.inode = i;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200350}
351static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
352 struct path p)
353{
Eric Parisf48b7392011-04-25 12:54:27 -0400354 a->a.u.path = p;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200355}
356static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
357 struct sock *sk)
358{
Eric Paris48c62af2012-04-02 13:15:44 -0400359 a->a.u.net->sk = sk;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200360}
361
362#else /* no AUDIT */
363
364static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
365 char type)
366{
367}
368static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
369 struct task_struct *t)
370{
371}
372static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
373 struct dentry *d)
374{
375}
376static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
377 struct vfsmount *m)
378{
379}
380static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
381 struct inode *i)
382{
383}
384static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
385 struct path p)
386{
387}
388static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
389 struct sock *sk)
390{
391}
392#endif
393
Casey Schauflere114e472008-02-04 22:29:50 -0800394#endif /* _SECURITY_SMACK_H */