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Linux/security/selinux/ss/policydb.h

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  1 /*
  2  * A policy database (policydb) specifies the
  3  * configuration data for the security policy.
  4  *
  5  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
  6  */
  7 
  8 /*
  9  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
 10  *
 11  *      Support for enhanced MLS infrastructure.
 12  *
 13  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
 14  *
 15  *      Added conditional policy language extensions
 16  *
 17  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
 18  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
 19  *      This program is free software; you can redistribute it and/or modify
 20  *      it under the terms of the GNU General Public License as published by
 21  *      the Free Software Foundation, version 2.
 22  */
 23 
 24 #ifndef _SS_POLICYDB_H_
 25 #define _SS_POLICYDB_H_
 26 
 27 #include <linux/flex_array.h>
 28 
 29 #include "symtab.h"
 30 #include "avtab.h"
 31 #include "sidtab.h"
 32 #include "ebitmap.h"
 33 #include "mls_types.h"
 34 #include "context.h"
 35 #include "constraint.h"
 36 
 37 /*
 38  * A datum type is defined for each kind of symbol
 39  * in the configuration data:  individual permissions,
 40  * common prefixes for access vectors, classes,
 41  * users, roles, types, sensitivities, categories, etc.
 42  */
 43 
 44 /* Permission attributes */
 45 struct perm_datum {
 46         u32 value;              /* permission bit + 1 */
 47 };
 48 
 49 /* Attributes of a common prefix for access vectors */
 50 struct common_datum {
 51         u32 value;                      /* internal common value */
 52         struct symtab permissions;      /* common permissions */
 53 };
 54 
 55 /* Class attributes */
 56 struct class_datum {
 57         u32 value;                      /* class value */
 58         char *comkey;                   /* common name */
 59         struct common_datum *comdatum;  /* common datum */
 60         struct symtab permissions;      /* class-specific permission symbol table */
 61         struct constraint_node *constraints;    /* constraints on class permissions */
 62         struct constraint_node *validatetrans;  /* special transition rules */
 63 /* Options how a new object user, role, and type should be decided */
 64 #define DEFAULT_SOURCE         1
 65 #define DEFAULT_TARGET         2
 66         char default_user;
 67         char default_role;
 68         char default_type;
 69 /* Options how a new object range should be decided */
 70 #define DEFAULT_SOURCE_LOW     1
 71 #define DEFAULT_SOURCE_HIGH    2
 72 #define DEFAULT_SOURCE_LOW_HIGH        3
 73 #define DEFAULT_TARGET_LOW     4
 74 #define DEFAULT_TARGET_HIGH    5
 75 #define DEFAULT_TARGET_LOW_HIGH        6
 76         char default_range;
 77 };
 78 
 79 /* Role attributes */
 80 struct role_datum {
 81         u32 value;                      /* internal role value */
 82         u32 bounds;                     /* boundary of role */
 83         struct ebitmap dominates;       /* set of roles dominated by this role */
 84         struct ebitmap types;           /* set of authorized types for role */
 85 };
 86 
 87 struct role_trans {
 88         u32 role;               /* current role */
 89         u32 type;               /* program executable type, or new object type */
 90         u32 tclass;             /* process class, or new object class */
 91         u32 new_role;           /* new role */
 92         struct role_trans *next;
 93 };
 94 
 95 struct filename_trans {
 96         u32 stype;              /* current process */
 97         u32 ttype;              /* parent dir context */
 98         u16 tclass;             /* class of new object */
 99         const char *name;       /* last path component */
100 };
101 
102 struct filename_trans_datum {
103         u32 otype;              /* expected of new object */
104 };
105 
106 struct role_allow {
107         u32 role;               /* current role */
108         u32 new_role;           /* new role */
109         struct role_allow *next;
110 };
111 
112 /* Type attributes */
113 struct type_datum {
114         u32 value;              /* internal type value */
115         u32 bounds;             /* boundary of type */
116         unsigned char primary;  /* primary name? */
117         unsigned char attribute;/* attribute ?*/
118 };
119 
120 /* User attributes */
121 struct user_datum {
122         u32 value;                      /* internal user value */
123         u32 bounds;                     /* bounds of user */
124         struct ebitmap roles;           /* set of authorized roles for user */
125         struct mls_range range;         /* MLS range (min - max) for user */
126         struct mls_level dfltlevel;     /* default login MLS level for user */
127 };
128 
129 
130 /* Sensitivity attributes */
131 struct level_datum {
132         struct mls_level *level;        /* sensitivity and associated categories */
133         unsigned char isalias;  /* is this sensitivity an alias for another? */
134 };
135 
136 /* Category attributes */
137 struct cat_datum {
138         u32 value;              /* internal category bit + 1 */
139         unsigned char isalias;  /* is this category an alias for another? */
140 };
141 
142 struct range_trans {
143         u32 source_type;
144         u32 target_type;
145         u32 target_class;
146 };
147 
148 /* Boolean data type */
149 struct cond_bool_datum {
150         __u32 value;            /* internal type value */
151         int state;
152 };
153 
154 struct cond_node;
155 
156 /*
157  * type set preserves data needed to determine constraint info from
158  * policy source. This is not used by the kernel policy but allows
159  * utilities such as audit2allow to determine constraint denials.
160  */
161 struct type_set {
162         struct ebitmap types;
163         struct ebitmap negset;
164         u32 flags;
165 };
166 
167 /*
168  * The configuration data includes security contexts for
169  * initial SIDs, unlabeled file systems, TCP and UDP port numbers,
170  * network interfaces, and nodes.  This structure stores the
171  * relevant data for one such entry.  Entries of the same kind
172  * (e.g. all initial SIDs) are linked together into a list.
173  */
174 struct ocontext {
175         union {
176                 char *name;     /* name of initial SID, fs, netif, fstype, path */
177                 struct {
178                         u8 protocol;
179                         u16 low_port;
180                         u16 high_port;
181                 } port;         /* TCP or UDP port information */
182                 struct {
183                         u32 addr;
184                         u32 mask;
185                 } node;         /* node information */
186                 struct {
187                         u32 addr[4];
188                         u32 mask[4];
189                 } node6;        /* IPv6 node information */
190         } u;
191         union {
192                 u32 sclass;  /* security class for genfs */
193                 u32 behavior;  /* labeling behavior for fs_use */
194         } v;
195         struct context context[2];      /* security context(s) */
196         u32 sid[2];     /* SID(s) */
197         struct ocontext *next;
198 };
199 
200 struct genfs {
201         char *fstype;
202         struct ocontext *head;
203         struct genfs *next;
204 };
205 
206 /* symbol table array indices */
207 #define SYM_COMMONS 0
208 #define SYM_CLASSES 1
209 #define SYM_ROLES   2
210 #define SYM_TYPES   3
211 #define SYM_USERS   4
212 #define SYM_BOOLS   5
213 #define SYM_LEVELS  6
214 #define SYM_CATS    7
215 #define SYM_NUM     8
216 
217 /* object context array indices */
218 #define OCON_ISID  0    /* initial SIDs */
219 #define OCON_FS    1    /* unlabeled file systems */
220 #define OCON_PORT  2    /* TCP and UDP port numbers */
221 #define OCON_NETIF 3    /* network interfaces */
222 #define OCON_NODE  4    /* nodes */
223 #define OCON_FSUSE 5    /* fs_use */
224 #define OCON_NODE6 6    /* IPv6 nodes */
225 #define OCON_NUM   7
226 
227 /* The policy database */
228 struct policydb {
229         int mls_enabled;
230 
231         /* symbol tables */
232         struct symtab symtab[SYM_NUM];
233 #define p_commons symtab[SYM_COMMONS]
234 #define p_classes symtab[SYM_CLASSES]
235 #define p_roles symtab[SYM_ROLES]
236 #define p_types symtab[SYM_TYPES]
237 #define p_users symtab[SYM_USERS]
238 #define p_bools symtab[SYM_BOOLS]
239 #define p_levels symtab[SYM_LEVELS]
240 #define p_cats symtab[SYM_CATS]
241 
242         /* symbol names indexed by (value - 1) */
243         struct flex_array *sym_val_to_name[SYM_NUM];
244 
245         /* class, role, and user attributes indexed by (value - 1) */
246         struct class_datum **class_val_to_struct;
247         struct role_datum **role_val_to_struct;
248         struct user_datum **user_val_to_struct;
249         struct flex_array *type_val_to_struct_array;
250 
251         /* type enforcement access vectors and transitions */
252         struct avtab te_avtab;
253 
254         /* role transitions */
255         struct role_trans *role_tr;
256 
257         /* file transitions with the last path component */
258         /* quickly exclude lookups when parent ttype has no rules */
259         struct ebitmap filename_trans_ttypes;
260         /* actual set of filename_trans rules */
261         struct hashtab *filename_trans;
262 
263         /* bools indexed by (value - 1) */
264         struct cond_bool_datum **bool_val_to_struct;
265         /* type enforcement conditional access vectors and transitions */
266         struct avtab te_cond_avtab;
267         /* linked list indexing te_cond_avtab by conditional */
268         struct cond_node *cond_list;
269 
270         /* role allows */
271         struct role_allow *role_allow;
272 
273         /* security contexts of initial SIDs, unlabeled file systems,
274            TCP or UDP port numbers, network interfaces and nodes */
275         struct ocontext *ocontexts[OCON_NUM];
276 
277         /* security contexts for files in filesystems that cannot support
278            a persistent label mapping or use another
279            fixed labeling behavior. */
280         struct genfs *genfs;
281 
282         /* range transitions table (range_trans_key -> mls_range) */
283         struct hashtab *range_tr;
284 
285         /* type -> attribute reverse mapping */
286         struct flex_array *type_attr_map_array;
287 
288         struct ebitmap policycaps;
289 
290         struct ebitmap permissive_map;
291 
292         /* length of this policy when it was loaded */
293         size_t len;
294 
295         unsigned int policyvers;
296 
297         unsigned int reject_unknown : 1;
298         unsigned int allow_unknown : 1;
299 
300         u16 process_class;
301         u32 process_trans_perms;
302 };
303 
304 extern void policydb_destroy(struct policydb *p);
305 extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
306 extern int policydb_context_isvalid(struct policydb *p, struct context *c);
307 extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
308 extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
309 extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
310 extern int policydb_read(struct policydb *p, void *fp);
311 extern int policydb_write(struct policydb *p, void *fp);
312 
313 #define PERM_SYMTAB_SIZE 32
314 
315 #define POLICYDB_CONFIG_MLS    1
316 
317 /* the config flags related to unknown classes/perms are bits 2 and 3 */
318 #define REJECT_UNKNOWN  0x00000002
319 #define ALLOW_UNKNOWN   0x00000004
320 
321 #define OBJECT_R "object_r"
322 #define OBJECT_R_VAL 1
323 
324 #define POLICYDB_MAGIC SELINUX_MAGIC
325 #define POLICYDB_STRING "SE Linux"
326 
327 struct policy_file {
328         char *data;
329         size_t len;
330 };
331 
332 struct policy_data {
333         struct policydb *p;
334         void *fp;
335 };
336 
337 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
338 {
339         if (bytes > fp->len)
340                 return -EINVAL;
341 
342         memcpy(buf, fp->data, bytes);
343         fp->data += bytes;
344         fp->len -= bytes;
345         return 0;
346 }
347 
348 static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp)
349 {
350         size_t len = bytes * num;
351 
352         memcpy(fp->data, buf, len);
353         fp->data += len;
354         fp->len -= len;
355 
356         return 0;
357 }
358 
359 static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr)
360 {
361         struct flex_array *fa = p->sym_val_to_name[sym_num];
362 
363         return flex_array_get_ptr(fa, element_nr);
364 }
365 
366 extern u16 string_to_security_class(struct policydb *p, const char *name);
367 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name);
368 
369 #endif  /* _SS_POLICYDB_H_ */
370 
371 

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