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Linux/security/smack/smack.h

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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  * 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  * This is the repository for labels seen so that it is
 33  * not necessary to keep allocating tiny chuncks of memory
 34  * and so that they can be shared.
 35  *
 36  * Labels are never modified in place. Anytime a label
 37  * is imported (e.g. xattrset on a file) the list is checked
 38  * for it and it is added if it doesn't exist. The address
 39  * is passed out in either case. Entries are added, but
 40  * never deleted.
 41  *
 42  * Since labels are hanging around anyway it doesn't
 43  * hurt to maintain a secid for those awkward situations
 44  * where kernel components that ought to use LSM independent
 45  * interfaces don't. The secid should go away when all of
 46  * these components have been repaired.
 47  *
 48  * The cipso value associated with the label gets stored here, too.
 49  *
 50  * Keep the access rules for this subject label here so that
 51  * the entire set of rules does not need to be examined every
 52  * time.
 53  */
 54 struct smack_known {
 55         struct list_head                list;
 56         struct hlist_node               smk_hashed;
 57         char                            *smk_known;
 58         u32                             smk_secid;
 59         struct netlbl_lsm_secattr       smk_netlabel;   /* on wire labels */
 60         struct list_head                smk_rules;      /* access rules */
 61         struct mutex                    smk_rules_lock; /* lock for rules */
 62 };
 63 
 64 /*
 65  * Maximum number of bytes for the levels in a CIPSO IP option.
 66  * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
 67  * bigger than can be used, and 24 is the next lower multiple
 68  * of 8, and there are too many issues if there isn't space set
 69  * aside for the terminating null byte.
 70  */
 71 #define SMK_CIPSOLEN    24
 72 
 73 struct superblock_smack {
 74         struct smack_known      *smk_root;
 75         struct smack_known      *smk_floor;
 76         struct smack_known      *smk_hat;
 77         struct smack_known      *smk_default;
 78         int                     smk_initialized;
 79 };
 80 
 81 struct socket_smack {
 82         struct smack_known      *smk_out;       /* outbound label */
 83         struct smack_known      *smk_in;        /* inbound label */
 84         struct smack_known      *smk_packet;    /* TCP peer label */
 85 };
 86 
 87 /*
 88  * Inode smack data
 89  */
 90 struct inode_smack {
 91         struct smack_known      *smk_inode;     /* label of the fso */
 92         struct smack_known      *smk_task;      /* label of the task */
 93         struct smack_known      *smk_mmap;      /* label of the mmap domain */
 94         struct mutex            smk_lock;       /* initialization lock */
 95         int                     smk_flags;      /* smack inode flags */
 96 };
 97 
 98 struct task_smack {
 99         struct smack_known      *smk_task;      /* label for access control */
100         struct smack_known      *smk_forked;    /* label when forked */
101         struct list_head        smk_rules;      /* per task access rules */
102         struct mutex            smk_rules_lock; /* lock for the rules */
103 };
104 
105 #define SMK_INODE_INSTANT       0x01    /* inode is instantiated */
106 #define SMK_INODE_TRANSMUTE     0x02    /* directory is transmuting */
107 #define SMK_INODE_CHANGED       0x04    /* smack was transmuted */
108 
109 /*
110  * A label access rule.
111  */
112 struct smack_rule {
113         struct list_head        list;
114         struct smack_known      *smk_subject;
115         struct smack_known      *smk_object;
116         int                     smk_access;
117 };
118 
119 /*
120  * An entry in the table identifying hosts.
121  */
122 struct smk_netlbladdr {
123         struct list_head        list;
124         struct sockaddr_in      smk_host;       /* network address */
125         struct in_addr          smk_mask;       /* network mask */
126         struct smack_known      *smk_label;     /* label */
127 };
128 
129 /*
130  * An entry in the table identifying ports.
131  */
132 struct smk_port_label {
133         struct list_head        list;
134         struct sock             *smk_sock;      /* socket initialized on */
135         unsigned short          smk_port;       /* the port number */
136         struct smack_known      *smk_in;        /* inbound label */
137         struct smack_known      *smk_out;       /* outgoing label */
138 };
139 
140 /*
141  * Mount options
142  */
143 #define SMK_FSDEFAULT   "smackfsdef="
144 #define SMK_FSFLOOR     "smackfsfloor="
145 #define SMK_FSHAT       "smackfshat="
146 #define SMK_FSROOT      "smackfsroot="
147 #define SMK_FSTRANS     "smackfstransmute="
148 
149 #define SMACK_CIPSO_OPTION      "-CIPSO"
150 
151 /*
152  * How communications on this socket are treated.
153  * Usually it's determined by the underlying netlabel code
154  * but there are certain cases, including single label hosts
155  * and potentially single label interfaces for which the
156  * treatment can not be known in advance.
157  *
158  * The possibility of additional labeling schemes being
159  * introduced in the future exists as well.
160  */
161 #define SMACK_UNLABELED_SOCKET  0
162 #define SMACK_CIPSO_SOCKET      1
163 
164 /*
165  * CIPSO defaults.
166  */
167 #define SMACK_CIPSO_DOI_DEFAULT         3       /* Historical */
168 #define SMACK_CIPSO_DOI_INVALID         -1      /* Not a DOI */
169 #define SMACK_CIPSO_DIRECT_DEFAULT      250     /* Arbitrary */
170 #define SMACK_CIPSO_MAPPED_DEFAULT      251     /* Also arbitrary */
171 #define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
172 /*
173  * CIPSO 2.2 standard is 239, but Smack wants to use the
174  * categories in a structured way that limits the value to
175  * the bits in 23 bytes, hence the unusual number.
176  */
177 #define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */
178 
179 /*
180  * Ptrace rules
181  */
182 #define SMACK_PTRACE_DEFAULT    0
183 #define SMACK_PTRACE_EXACT      1
184 #define SMACK_PTRACE_DRACONIAN  2
185 #define SMACK_PTRACE_MAX        SMACK_PTRACE_DRACONIAN
186 
187 /*
188  * Flags for untraditional access modes.
189  * It shouldn't be necessary to avoid conflicts with definitions
190  * in fs.h, but do so anyway.
191  */
192 #define MAY_TRANSMUTE   0x00001000      /* Controls directory labeling */
193 #define MAY_LOCK        0x00002000      /* Locks should be writes, but ... */
194 #define MAY_BRINGUP     0x00004000      /* Report use of this rule */
195 
196 /*
197  * Just to make the common cases easier to deal with
198  */
199 #define MAY_ANYREAD     (MAY_READ | MAY_EXEC)
200 #define MAY_READWRITE   (MAY_READ | MAY_WRITE)
201 #define MAY_NOT         0
202 
203 /*
204  * Number of access types used by Smack (rwxatlb)
205  */
206 #define SMK_NUM_ACCESS_TYPE 7
207 
208 /* SMACK data */
209 struct smack_audit_data {
210         const char *function;
211         char *subject;
212         char *object;
213         char *request;
214         int result;
215 };
216 
217 /*
218  * Smack audit data; is empty if CONFIG_AUDIT not set
219  * to save some stack
220  */
221 struct smk_audit_info {
222 #ifdef CONFIG_AUDIT
223         struct common_audit_data a;
224         struct smack_audit_data sad;
225 #endif
226 };
227 /*
228  * These functions are in smack_lsm.c
229  */
230 struct inode_smack *new_inode_smack(struct smack_known *);
231 
232 /*
233  * These functions are in smack_access.c
234  */
235 int smk_access_entry(char *, char *, struct list_head *);
236 int smk_access(struct smack_known *, struct smack_known *,
237                int, struct smk_audit_info *);
238 int smk_tskacc(struct task_smack *, struct smack_known *,
239                u32, struct smk_audit_info *);
240 int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
241 struct smack_known *smack_from_secid(const u32);
242 char *smk_parse_smack(const char *string, int len);
243 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
244 struct smack_known *smk_import_entry(const char *, int);
245 void smk_insert_entry(struct smack_known *skp);
246 struct smack_known *smk_find_entry(const char *);
247 
248 /*
249  * Shared data.
250  */
251 extern int smack_cipso_direct;
252 extern int smack_cipso_mapped;
253 extern struct smack_known *smack_net_ambient;
254 extern struct smack_known *smack_onlycap;
255 extern struct smack_known *smack_syslog_label;
256 extern struct smack_known smack_cipso_option;
257 extern int smack_ptrace_rule;
258 
259 extern struct smack_known smack_known_floor;
260 extern struct smack_known smack_known_hat;
261 extern struct smack_known smack_known_huh;
262 extern struct smack_known smack_known_invalid;
263 extern struct smack_known smack_known_star;
264 extern struct smack_known smack_known_web;
265 
266 extern struct mutex     smack_known_lock;
267 extern struct list_head smack_known_list;
268 extern struct list_head smk_netlbladdr_list;
269 
270 extern struct security_operations smack_ops;
271 
272 #define SMACK_HASH_SLOTS 16
273 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
274 
275 /*
276  * Is the directory transmuting?
277  */
278 static inline int smk_inode_transmutable(const struct inode *isp)
279 {
280         struct inode_smack *sip = isp->i_security;
281         return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
282 }
283 
284 /*
285  * Present a pointer to the smack label entry in an inode blob.
286  */
287 static inline struct smack_known *smk_of_inode(const struct inode *isp)
288 {
289         struct inode_smack *sip = isp->i_security;
290         return sip->smk_inode;
291 }
292 
293 /*
294  * Present a pointer to the smack label entry in an task blob.
295  */
296 static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
297 {
298         return tsp->smk_task;
299 }
300 
301 static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
302 {
303         struct smack_known *skp;
304 
305         rcu_read_lock();
306         skp = smk_of_task(__task_cred(t)->security);
307         rcu_read_unlock();
308         return skp;
309 }
310 
311 /*
312  * Present a pointer to the forked smack label entry in an task blob.
313  */
314 static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
315 {
316         return tsp->smk_forked;
317 }
318 
319 /*
320  * Present a pointer to the smack label in the current task blob.
321  */
322 static inline struct smack_known *smk_of_current(void)
323 {
324         return smk_of_task(current_security());
325 }
326 
327 /*
328  * Is the task privileged and allowed to be privileged
329  * by the onlycap rule.
330  */
331 static inline int smack_privileged(int cap)
332 {
333         struct smack_known *skp = smk_of_current();
334 
335         if (!capable(cap))
336                 return 0;
337         if (smack_onlycap == NULL || smack_onlycap == skp)
338                 return 1;
339         return 0;
340 }
341 
342 /*
343  * logging functions
344  */
345 #define SMACK_AUDIT_DENIED 0x1
346 #define SMACK_AUDIT_ACCEPT 0x2
347 extern int log_policy;
348 
349 void smack_log(char *subject_label, char *object_label,
350                 int request,
351                 int result, struct smk_audit_info *auditdata);
352 
353 #ifdef CONFIG_AUDIT
354 
355 /*
356  * some inline functions to set up audit data
357  * they do nothing if CONFIG_AUDIT is not set
358  *
359  */
360 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
361                                char type)
362 {
363         memset(&a->sad, 0, sizeof(a->sad));
364         a->a.type = type;
365         a->a.smack_audit_data = &a->sad;
366         a->a.smack_audit_data->function = func;
367 }
368 
369 static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
370                                    char type, struct lsm_network_audit *net)
371 {
372         smk_ad_init(a, func, type);
373         memset(net, 0, sizeof(*net));
374         a->a.u.net = net;
375 }
376 
377 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
378                                          struct task_struct *t)
379 {
380         a->a.u.tsk = t;
381 }
382 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
383                                                     struct dentry *d)
384 {
385         a->a.u.dentry = d;
386 }
387 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
388                                               struct inode *i)
389 {
390         a->a.u.inode = i;
391 }
392 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
393                                              struct path p)
394 {
395         a->a.u.path = p;
396 }
397 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
398                                             struct sock *sk)
399 {
400         a->a.u.net->sk = sk;
401 }
402 
403 #else /* no AUDIT */
404 
405 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
406                                char type)
407 {
408 }
409 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
410                                          struct task_struct *t)
411 {
412 }
413 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
414                                                     struct dentry *d)
415 {
416 }
417 static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
418                                                  struct vfsmount *m)
419 {
420 }
421 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
422                                               struct inode *i)
423 {
424 }
425 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
426                                              struct path p)
427 {
428 }
429 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
430                                             struct sock *sk)
431 {
432 }
433 #endif
434 
435 #endif  /* _SECURITY_SMACK_H */
436 

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