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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/lsm_hooks.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 #define SMK_INODE_IMPURE        0x08    /* involved in an impure transaction */
109 
110 /*
111  * A label access rule.
112  */
113 struct smack_rule {
114         struct list_head        list;
115         struct smack_known      *smk_subject;
116         struct smack_known      *smk_object;
117         int                     smk_access;
118 };
119 
120 /*
121  * An entry in the table identifying hosts.
122  */
123 struct smk_netlbladdr {
124         struct list_head        list;
125         struct sockaddr_in      smk_host;       /* network address */
126         struct in_addr          smk_mask;       /* network mask */
127         struct smack_known      *smk_label;     /* label */
128 };
129 
130 /*
131  * An entry in the table identifying ports.
132  */
133 struct smk_port_label {
134         struct list_head        list;
135         struct sock             *smk_sock;      /* socket initialized on */
136         unsigned short          smk_port;       /* the port number */
137         struct smack_known      *smk_in;        /* inbound label */
138         struct smack_known      *smk_out;       /* outgoing label */
139 };
140 
141 struct smack_onlycap {
142         struct list_head        list;
143         struct smack_known      *smk_label;
144 };
145 
146 /*
147  * Mount options
148  */
149 #define SMK_FSDEFAULT   "smackfsdef="
150 #define SMK_FSFLOOR     "smackfsfloor="
151 #define SMK_FSHAT       "smackfshat="
152 #define SMK_FSROOT      "smackfsroot="
153 #define SMK_FSTRANS     "smackfstransmute="
154 
155 #define SMACK_CIPSO_OPTION      "-CIPSO"
156 
157 /*
158  * How communications on this socket are treated.
159  * Usually it's determined by the underlying netlabel code
160  * but there are certain cases, including single label hosts
161  * and potentially single label interfaces for which the
162  * treatment can not be known in advance.
163  *
164  * The possibility of additional labeling schemes being
165  * introduced in the future exists as well.
166  */
167 #define SMACK_UNLABELED_SOCKET  0
168 #define SMACK_CIPSO_SOCKET      1
169 
170 /*
171  * CIPSO defaults.
172  */
173 #define SMACK_CIPSO_DOI_DEFAULT         3       /* Historical */
174 #define SMACK_CIPSO_DOI_INVALID         -1      /* Not a DOI */
175 #define SMACK_CIPSO_DIRECT_DEFAULT      250     /* Arbitrary */
176 #define SMACK_CIPSO_MAPPED_DEFAULT      251     /* Also arbitrary */
177 #define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
178 /*
179  * CIPSO 2.2 standard is 239, but Smack wants to use the
180  * categories in a structured way that limits the value to
181  * the bits in 23 bytes, hence the unusual number.
182  */
183 #define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */
184 
185 /*
186  * Ptrace rules
187  */
188 #define SMACK_PTRACE_DEFAULT    0
189 #define SMACK_PTRACE_EXACT      1
190 #define SMACK_PTRACE_DRACONIAN  2
191 #define SMACK_PTRACE_MAX        SMACK_PTRACE_DRACONIAN
192 
193 /*
194  * Flags for untraditional access modes.
195  * It shouldn't be necessary to avoid conflicts with definitions
196  * in fs.h, but do so anyway.
197  */
198 #define MAY_TRANSMUTE   0x00001000      /* Controls directory labeling */
199 #define MAY_LOCK        0x00002000      /* Locks should be writes, but ... */
200 #define MAY_BRINGUP     0x00004000      /* Report use of this rule */
201 
202 #define SMACK_BRINGUP_ALLOW             1       /* Allow bringup mode */
203 #define SMACK_UNCONFINED_SUBJECT        2       /* Allow unconfined label */
204 #define SMACK_UNCONFINED_OBJECT         3       /* Allow unconfined label */
205 
206 /*
207  * Just to make the common cases easier to deal with
208  */
209 #define MAY_ANYREAD     (MAY_READ | MAY_EXEC)
210 #define MAY_READWRITE   (MAY_READ | MAY_WRITE)
211 #define MAY_NOT         0
212 
213 /*
214  * Number of access types used by Smack (rwxatlb)
215  */
216 #define SMK_NUM_ACCESS_TYPE 7
217 
218 /* SMACK data */
219 struct smack_audit_data {
220         const char *function;
221         char *subject;
222         char *object;
223         char *request;
224         int result;
225 };
226 
227 /*
228  * Smack audit data; is empty if CONFIG_AUDIT not set
229  * to save some stack
230  */
231 struct smk_audit_info {
232 #ifdef CONFIG_AUDIT
233         struct common_audit_data a;
234         struct smack_audit_data sad;
235 #endif
236 };
237 /*
238  * These functions are in smack_lsm.c
239  */
240 struct inode_smack *new_inode_smack(struct smack_known *);
241 
242 /*
243  * These functions are in smack_access.c
244  */
245 int smk_access_entry(char *, char *, struct list_head *);
246 int smk_access(struct smack_known *, struct smack_known *,
247                int, struct smk_audit_info *);
248 int smk_tskacc(struct task_smack *, struct smack_known *,
249                u32, struct smk_audit_info *);
250 int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
251 struct smack_known *smack_from_secid(const u32);
252 char *smk_parse_smack(const char *string, int len);
253 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
254 struct smack_known *smk_import_entry(const char *, int);
255 void smk_insert_entry(struct smack_known *skp);
256 struct smack_known *smk_find_entry(const char *);
257 int smack_privileged(int cap);
258 
259 /*
260  * Shared data.
261  */
262 extern int smack_enabled;
263 extern int smack_cipso_direct;
264 extern int smack_cipso_mapped;
265 extern struct smack_known *smack_net_ambient;
266 extern struct smack_known *smack_syslog_label;
267 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
268 extern struct smack_known *smack_unconfined;
269 #endif
270 extern struct smack_known smack_cipso_option;
271 extern int smack_ptrace_rule;
272 
273 extern struct smack_known smack_known_floor;
274 extern struct smack_known smack_known_hat;
275 extern struct smack_known smack_known_huh;
276 extern struct smack_known smack_known_invalid;
277 extern struct smack_known smack_known_star;
278 extern struct smack_known smack_known_web;
279 
280 extern struct mutex     smack_known_lock;
281 extern struct list_head smack_known_list;
282 extern struct list_head smk_netlbladdr_list;
283 
284 extern struct mutex     smack_onlycap_lock;
285 extern struct list_head smack_onlycap_list;
286 
287 #define SMACK_HASH_SLOTS 16
288 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
289 
290 /*
291  * Is the directory transmuting?
292  */
293 static inline int smk_inode_transmutable(const struct inode *isp)
294 {
295         struct inode_smack *sip = isp->i_security;
296         return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
297 }
298 
299 /*
300  * Present a pointer to the smack label entry in an inode blob.
301  */
302 static inline struct smack_known *smk_of_inode(const struct inode *isp)
303 {
304         struct inode_smack *sip = isp->i_security;
305         return sip->smk_inode;
306 }
307 
308 /*
309  * Present a pointer to the smack label entry in an task blob.
310  */
311 static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
312 {
313         return tsp->smk_task;
314 }
315 
316 static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
317 {
318         struct smack_known *skp;
319 
320         rcu_read_lock();
321         skp = smk_of_task(__task_cred(t)->security);
322         rcu_read_unlock();
323         return skp;
324 }
325 
326 /*
327  * Present a pointer to the forked smack label entry in an task blob.
328  */
329 static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
330 {
331         return tsp->smk_forked;
332 }
333 
334 /*
335  * Present a pointer to the smack label in the current task blob.
336  */
337 static inline struct smack_known *smk_of_current(void)
338 {
339         return smk_of_task(current_security());
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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