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e114e473 CS |
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 | * Authors: | |
9 | * Casey Schaufler <casey@schaufler-ca.com> | |
10 | * Ahmed S. Darwish <darwish.07@gmail.com> | |
11 | * | |
12 | * Special thanks to the authors of selinuxfs. | |
13 | * | |
14 | * Karl MacMillan <kmacmillan@tresys.com> | |
15 | * James Morris <jmorris@redhat.com> | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/security.h> | |
22 | #include <linux/mutex.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
6d3dc07c | 24 | #include <net/net_namespace.h> |
e114e473 CS |
25 | #include <net/cipso_ipv4.h> |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/ctype.h> | |
4bc87e62 | 28 | #include <linux/audit.h> |
958d2c2f | 29 | #include <linux/magic.h> |
e114e473 CS |
30 | #include "smack.h" |
31 | ||
32 | /* | |
33 | * smackfs pseudo filesystem. | |
34 | */ | |
35 | ||
36 | enum smk_inos { | |
37 | SMK_ROOT_INO = 2, | |
38 | SMK_LOAD = 3, /* load policy */ | |
39 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
40 | SMK_DOI = 5, /* CIPSO DOI */ | |
41 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
42 | SMK_AMBIENT = 7, /* internet ambient label */ | |
6d3dc07c | 43 | SMK_NETLBLADDR = 8, /* single label hosts */ |
15446235 | 44 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
ecfcc53f | 45 | SMK_LOGGING = 10, /* logging */ |
7898e1f8 | 46 | SMK_LOAD_SELF = 11, /* task specific rules */ |
828716c2 | 47 | SMK_ACCESSES = 12, /* access policy */ |
f7112e6c CS |
48 | SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ |
49 | SMK_LOAD2 = 14, /* load policy with long labels */ | |
50 | SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ | |
51 | SMK_ACCESS2 = 16, /* make an access check with long labels */ | |
52 | SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ | |
449543b0 | 53 | SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ |
e05b6f98 | 54 | SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ |
e114e473 CS |
55 | }; |
56 | ||
57 | /* | |
58 | * List locks | |
59 | */ | |
e114e473 | 60 | static DEFINE_MUTEX(smack_cipso_lock); |
4bc87e62 | 61 | static DEFINE_MUTEX(smack_ambient_lock); |
6d3dc07c | 62 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
63 | |
64 | /* | |
65 | * This is the "ambient" label for network traffic. | |
66 | * If it isn't somehow marked, use this. | |
67 | * It can be reset via smackfs/ambient | |
68 | */ | |
f7112e6c | 69 | char *smack_net_ambient; |
e114e473 | 70 | |
e114e473 CS |
71 | /* |
72 | * This is the level in a CIPSO header that indicates a | |
73 | * smack label is contained directly in the category set. | |
74 | * It can be reset via smackfs/direct | |
75 | */ | |
76 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
77 | ||
f7112e6c CS |
78 | /* |
79 | * This is the level in a CIPSO header that indicates a | |
80 | * secid is contained directly in the category set. | |
81 | * It can be reset via smackfs/mapped | |
82 | */ | |
83 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; | |
84 | ||
15446235 CS |
85 | /* |
86 | * Unless a process is running with this label even | |
87 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
88 | * privilege to violate MAC policy. If no label is | |
89 | * designated (the NULL case) capabilities apply to | |
90 | * everyone. It is expected that the hat (^) label | |
91 | * will be used if any label is used. | |
92 | */ | |
93 | char *smack_onlycap; | |
94 | ||
6d3dc07c CS |
95 | /* |
96 | * Certain IP addresses may be designated as single label hosts. | |
97 | * Packets are sent there unlabeled, but only from tasks that | |
98 | * can write to the specified label. | |
99 | */ | |
7198e2ee EB |
100 | |
101 | LIST_HEAD(smk_netlbladdr_list); | |
272cd7a8 CS |
102 | |
103 | /* | |
104 | * Rule lists are maintained for each label. | |
f7112e6c | 105 | * This master list is just for reading /smack/load and /smack/load2. |
272cd7a8 CS |
106 | */ |
107 | struct smack_master_list { | |
108 | struct list_head list; | |
109 | struct smack_rule *smk_rule; | |
110 | }; | |
111 | ||
7198e2ee | 112 | LIST_HEAD(smack_rule_list); |
6d3dc07c | 113 | |
e05b6f98 RK |
114 | struct smack_parsed_rule { |
115 | char *smk_subject; | |
116 | char *smk_object; | |
117 | int smk_access1; | |
118 | int smk_access2; | |
119 | }; | |
120 | ||
e114e473 | 121 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 122 | |
4303154e EB |
123 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
124 | ||
e114e473 CS |
125 | /* |
126 | * Values for parsing cipso rules | |
127 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
128 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
129 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
130 | */ |
131 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
132 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
133 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
134 | ||
135 | /* | |
136 | * Values for parsing MAC rules | |
137 | * SMK_ACCESS: Maximum possible combination of access permissions | |
138 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
139 | * SMK_LOADLEN: Smack rule length | |
140 | */ | |
5c6d1125 JS |
141 | #define SMK_OACCESS "rwxa" |
142 | #define SMK_ACCESS "rwxat" | |
143 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) | |
144 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
145 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
146 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 147 | |
f7112e6c CS |
148 | /* |
149 | * Stricly for CIPSO level manipulation. | |
150 | * Set the category bit number in a smack label sized buffer. | |
151 | */ | |
152 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) | |
153 | { | |
154 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) | |
155 | return; | |
156 | ||
157 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
158 | } | |
159 | ||
6d3dc07c CS |
160 | /** |
161 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
162 | * @nap: structure to fill | |
163 | */ | |
164 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
165 | { | |
166 | nap->loginuid = audit_get_loginuid(current); | |
167 | nap->sessionid = audit_get_sessionid(current); | |
676dac4b | 168 | nap->secid = smack_to_secid(smk_of_current()); |
6d3dc07c CS |
169 | } |
170 | ||
171 | /* | |
f7112e6c | 172 | * Value for parsing single label host rules |
6d3dc07c | 173 | * "1.2.3.4 X" |
6d3dc07c CS |
174 | */ |
175 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 176 | |
e114e473 | 177 | /** |
e05b6f98 RK |
178 | * smk_set_access - add a rule to the rule list or replace an old rule |
179 | * @srp: the rule to add or replace | |
7898e1f8 CS |
180 | * @rule_list: the list of rules |
181 | * @rule_lock: the rule list lock | |
e05b6f98 | 182 | * @global: if non-zero, indicates a global rule |
e114e473 CS |
183 | * |
184 | * Looks through the current subject/object/access list for | |
185 | * the subject/object pair and replaces the access that was | |
186 | * there. If the pair isn't found add it with the specified | |
187 | * access. | |
81ea714b SL |
188 | * |
189 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
190 | * during the allocation of the new pair to add. | |
e114e473 | 191 | */ |
e05b6f98 RK |
192 | static int smk_set_access(struct smack_parsed_rule *srp, |
193 | struct list_head *rule_list, | |
194 | struct mutex *rule_lock, int global) | |
e114e473 | 195 | { |
7198e2ee | 196 | struct smack_rule *sp; |
e05b6f98 | 197 | struct smack_master_list *smlp; |
7898e1f8 | 198 | int found = 0; |
e05b6f98 | 199 | int rc = 0; |
e114e473 | 200 | |
7898e1f8 CS |
201 | mutex_lock(rule_lock); |
202 | ||
272cd7a8 CS |
203 | /* |
204 | * Because the object label is less likely to match | |
205 | * than the subject label check it first | |
206 | */ | |
7898e1f8 | 207 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
208 | if (sp->smk_object == srp->smk_object && |
209 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee | 210 | found = 1; |
e05b6f98 RK |
211 | sp->smk_access |= srp->smk_access1; |
212 | sp->smk_access &= ~srp->smk_access2; | |
e114e473 CS |
213 | break; |
214 | } | |
e114e473 CS |
215 | } |
216 | ||
e05b6f98 RK |
217 | if (found == 0) { |
218 | sp = kzalloc(sizeof(*sp), GFP_KERNEL); | |
219 | if (sp == NULL) { | |
220 | rc = -ENOMEM; | |
221 | goto out; | |
222 | } | |
223 | ||
224 | sp->smk_subject = srp->smk_subject; | |
225 | sp->smk_object = srp->smk_object; | |
226 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; | |
227 | ||
228 | list_add_rcu(&sp->list, rule_list); | |
229 | /* | |
230 | * If this is a global as opposed to self and a new rule | |
231 | * it needs to get added for reporting. | |
232 | */ | |
233 | if (global) { | |
234 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
235 | if (smlp != NULL) { | |
236 | smlp->smk_rule = sp; | |
237 | list_add_rcu(&smlp->list, &smack_rule_list); | |
238 | } else | |
239 | rc = -ENOMEM; | |
240 | } | |
241 | } | |
242 | ||
243 | out: | |
7898e1f8 | 244 | mutex_unlock(rule_lock); |
e05b6f98 RK |
245 | return rc; |
246 | } | |
247 | ||
248 | /** | |
249 | * smk_perm_from_str - parse smack accesses from a text string | |
250 | * @string: a text string that contains a Smack accesses code | |
251 | * | |
252 | * Returns an integer with respective bits set for specified accesses. | |
253 | */ | |
254 | static int smk_perm_from_str(const char *string) | |
255 | { | |
256 | int perm = 0; | |
257 | const char *cp; | |
e114e473 | 258 | |
e05b6f98 RK |
259 | for (cp = string; ; cp++) |
260 | switch (*cp) { | |
261 | case '-': | |
262 | break; | |
263 | case 'r': | |
264 | case 'R': | |
265 | perm |= MAY_READ; | |
266 | break; | |
267 | case 'w': | |
268 | case 'W': | |
269 | perm |= MAY_WRITE; | |
270 | break; | |
271 | case 'x': | |
272 | case 'X': | |
273 | perm |= MAY_EXEC; | |
274 | break; | |
275 | case 'a': | |
276 | case 'A': | |
277 | perm |= MAY_APPEND; | |
278 | break; | |
279 | case 't': | |
280 | case 'T': | |
281 | perm |= MAY_TRANSMUTE; | |
282 | break; | |
283 | default: | |
284 | return perm; | |
285 | } | |
e114e473 CS |
286 | } |
287 | ||
288 | /** | |
f7112e6c CS |
289 | * smk_fill_rule - Fill Smack rule from strings |
290 | * @subject: subject label string | |
291 | * @object: object label string | |
e05b6f98 RK |
292 | * @access1: access string |
293 | * @access2: string with permissions to be removed | |
0e94ae17 JS |
294 | * @rule: Smack rule |
295 | * @import: if non-zero, import labels | |
3518721a | 296 | * @len: label length limit |
f7112e6c CS |
297 | * |
298 | * Returns 0 on success, -1 on failure | |
e114e473 | 299 | */ |
f7112e6c | 300 | static int smk_fill_rule(const char *subject, const char *object, |
e05b6f98 RK |
301 | const char *access1, const char *access2, |
302 | struct smack_parsed_rule *rule, int import, | |
303 | int len) | |
e114e473 | 304 | { |
f7112e6c | 305 | const char *cp; |
0e94ae17 | 306 | struct smack_known *skp; |
e114e473 | 307 | |
0e94ae17 | 308 | if (import) { |
3518721a | 309 | rule->smk_subject = smk_import(subject, len); |
0e94ae17 JS |
310 | if (rule->smk_subject == NULL) |
311 | return -1; | |
312 | ||
3518721a | 313 | rule->smk_object = smk_import(object, len); |
0e94ae17 JS |
314 | if (rule->smk_object == NULL) |
315 | return -1; | |
316 | } else { | |
3518721a | 317 | cp = smk_parse_smack(subject, len); |
f7112e6c CS |
318 | if (cp == NULL) |
319 | return -1; | |
320 | skp = smk_find_entry(cp); | |
321 | kfree(cp); | |
0e94ae17 JS |
322 | if (skp == NULL) |
323 | return -1; | |
324 | rule->smk_subject = skp->smk_known; | |
325 | ||
3518721a | 326 | cp = smk_parse_smack(object, len); |
f7112e6c CS |
327 | if (cp == NULL) |
328 | return -1; | |
329 | skp = smk_find_entry(cp); | |
330 | kfree(cp); | |
0e94ae17 JS |
331 | if (skp == NULL) |
332 | return -1; | |
333 | rule->smk_object = skp->smk_known; | |
334 | } | |
7198e2ee | 335 | |
e05b6f98 RK |
336 | rule->smk_access1 = smk_perm_from_str(access1); |
337 | if (access2) | |
338 | rule->smk_access2 = smk_perm_from_str(access2); | |
339 | else | |
340 | rule->smk_access2 = ~rule->smk_access1; | |
e114e473 | 341 | |
3518721a | 342 | return 0; |
f7112e6c | 343 | } |
e114e473 | 344 | |
f7112e6c CS |
345 | /** |
346 | * smk_parse_rule - parse Smack rule from load string | |
347 | * @data: string to be parsed whose size is SMK_LOADLEN | |
348 | * @rule: Smack rule | |
349 | * @import: if non-zero, import labels | |
350 | * | |
351 | * Returns 0 on success, -1 on errors. | |
352 | */ | |
e05b6f98 RK |
353 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
354 | int import) | |
f7112e6c CS |
355 | { |
356 | int rc; | |
e114e473 | 357 | |
f7112e6c | 358 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
e05b6f98 RK |
359 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
360 | import, SMK_LABELLEN); | |
f7112e6c CS |
361 | return rc; |
362 | } | |
e114e473 | 363 | |
f7112e6c CS |
364 | /** |
365 | * smk_parse_long_rule - parse Smack rule from rule string | |
366 | * @data: string to be parsed, null terminated | |
e05b6f98 | 367 | * @rule: Will be filled with Smack parsed rule |
f7112e6c | 368 | * @import: if non-zero, import labels |
e05b6f98 | 369 | * @change: if non-zero, data is from /smack/change-rule |
f7112e6c CS |
370 | * |
371 | * Returns 0 on success, -1 on failure | |
372 | */ | |
e05b6f98 RK |
373 | static int smk_parse_long_rule(const char *data, struct smack_parsed_rule *rule, |
374 | int import, int change) | |
f7112e6c CS |
375 | { |
376 | char *subject; | |
377 | char *object; | |
e05b6f98 RK |
378 | char *access1; |
379 | char *access2; | |
f7112e6c CS |
380 | int datalen; |
381 | int rc = -1; | |
5c6d1125 | 382 | |
3b9fc372 | 383 | /* This is inefficient */ |
f7112e6c | 384 | datalen = strlen(data); |
3b9fc372 AC |
385 | |
386 | /* Our first element can be 64 + \0 with no spaces */ | |
387 | subject = kzalloc(datalen + 1, GFP_KERNEL); | |
f7112e6c CS |
388 | if (subject == NULL) |
389 | return -1; | |
390 | object = kzalloc(datalen, GFP_KERNEL); | |
391 | if (object == NULL) | |
392 | goto free_out_s; | |
e05b6f98 RK |
393 | access1 = kzalloc(datalen, GFP_KERNEL); |
394 | if (access1 == NULL) | |
f7112e6c | 395 | goto free_out_o; |
e05b6f98 RK |
396 | access2 = kzalloc(datalen, GFP_KERNEL); |
397 | if (access2 == NULL) | |
398 | goto free_out_a; | |
399 | ||
400 | if (change) { | |
401 | if (sscanf(data, "%s %s %s %s", | |
402 | subject, object, access1, access2) == 4) | |
403 | rc = smk_fill_rule(subject, object, access1, access2, | |
404 | rule, import, 0); | |
405 | } else { | |
406 | if (sscanf(data, "%s %s %s", subject, object, access1) == 3) | |
407 | rc = smk_fill_rule(subject, object, access1, NULL, | |
408 | rule, import, 0); | |
409 | } | |
f7112e6c | 410 | |
e05b6f98 RK |
411 | kfree(access2); |
412 | free_out_a: | |
413 | kfree(access1); | |
f7112e6c CS |
414 | free_out_o: |
415 | kfree(object); | |
416 | free_out_s: | |
417 | kfree(subject); | |
418 | return rc; | |
828716c2 JS |
419 | } |
420 | ||
f7112e6c CS |
421 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
422 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
e05b6f98 | 423 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
828716c2 | 424 | /** |
f7112e6c | 425 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
426 | * @file: file pointer, not actually used |
427 | * @buf: where to get the data from | |
428 | * @count: bytes sent | |
429 | * @ppos: where to start - must be 0 | |
430 | * @rule_list: the list of rules to write to | |
431 | * @rule_lock: lock for the rule list | |
e05b6f98 | 432 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 JS |
433 | * |
434 | * Get one smack access rule from above. | |
f7112e6c CS |
435 | * The format for SMK_LONG_FMT is: |
436 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
437 | * The format for SMK_FIXED24_FMT is exactly: | |
438 | * "subject object rwxat" | |
e05b6f98 RK |
439 | * The format for SMK_CHANGE_FMT is: |
440 | * "subject<whitespace>object<whitespace> | |
441 | * acc_enable<whitespace>acc_disable[<whitespace>...]" | |
828716c2 | 442 | */ |
f7112e6c CS |
443 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
444 | size_t count, loff_t *ppos, | |
445 | struct list_head *rule_list, | |
446 | struct mutex *rule_lock, int format) | |
828716c2 | 447 | { |
272cd7a8 | 448 | struct smack_known *skp; |
e05b6f98 | 449 | struct smack_parsed_rule *rule; |
828716c2 | 450 | char *data; |
f7112e6c | 451 | int datalen; |
828716c2 | 452 | int rc = -EINVAL; |
272cd7a8 | 453 | int load = 0; |
828716c2 JS |
454 | |
455 | /* | |
456 | * No partial writes. | |
457 | * Enough data must be present. | |
458 | */ | |
459 | if (*ppos != 0) | |
460 | return -EINVAL; | |
828716c2 | 461 | |
f7112e6c CS |
462 | if (format == SMK_FIXED24_FMT) { |
463 | /* | |
464 | * Minor hack for backward compatibility | |
465 | */ | |
466 | if (count != SMK_OLOADLEN && count != SMK_LOADLEN) | |
467 | return -EINVAL; | |
468 | datalen = SMK_LOADLEN; | |
469 | } else | |
470 | datalen = count + 1; | |
471 | ||
472 | data = kzalloc(datalen, GFP_KERNEL); | |
828716c2 JS |
473 | if (data == NULL) |
474 | return -ENOMEM; | |
475 | ||
476 | if (copy_from_user(data, buf, count) != 0) { | |
477 | rc = -EFAULT; | |
478 | goto out; | |
479 | } | |
480 | ||
828716c2 JS |
481 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
482 | if (rule == NULL) { | |
483 | rc = -ENOMEM; | |
484 | goto out; | |
485 | } | |
486 | ||
f7112e6c CS |
487 | if (format == SMK_LONG_FMT) { |
488 | /* | |
489 | * Be sure the data string is terminated. | |
490 | */ | |
491 | data[count] = '\0'; | |
e05b6f98 RK |
492 | if (smk_parse_long_rule(data, rule, 1, 0)) |
493 | goto out_free_rule; | |
494 | } else if (format == SMK_CHANGE_FMT) { | |
495 | data[count] = '\0'; | |
496 | if (smk_parse_long_rule(data, rule, 1, 1)) | |
f7112e6c CS |
497 | goto out_free_rule; |
498 | } else { | |
499 | /* | |
500 | * More on the minor hack for backward compatibility | |
501 | */ | |
502 | if (count == (SMK_OLOADLEN)) | |
503 | data[SMK_OLOADLEN] = '-'; | |
504 | if (smk_parse_rule(data, rule, 1)) | |
505 | goto out_free_rule; | |
506 | } | |
507 | ||
828716c2 | 508 | |
272cd7a8 CS |
509 | if (rule_list == NULL) { |
510 | load = 1; | |
511 | skp = smk_find_entry(rule->smk_subject); | |
512 | rule_list = &skp->smk_rules; | |
513 | rule_lock = &skp->smk_rules_lock; | |
514 | } | |
515 | ||
e05b6f98 RK |
516 | rc = smk_set_access(rule, rule_list, rule_lock, load); |
517 | if (rc == 0) { | |
518 | rc = count; | |
7898e1f8 | 519 | goto out; |
272cd7a8 | 520 | } |
e114e473 | 521 | |
7198e2ee EB |
522 | out_free_rule: |
523 | kfree(rule); | |
e114e473 CS |
524 | out: |
525 | kfree(data); | |
526 | return rc; | |
527 | } | |
528 | ||
7898e1f8 | 529 | /* |
40809565 | 530 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
531 | */ |
532 | ||
40809565 CS |
533 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
534 | struct list_head *head) | |
7898e1f8 | 535 | { |
272cd7a8 CS |
536 | struct list_head *list; |
537 | ||
538 | /* | |
539 | * This is 0 the first time through. | |
540 | */ | |
541 | if (s->index == 0) | |
40809565 | 542 | s->private = head; |
272cd7a8 CS |
543 | |
544 | if (s->private == NULL) | |
7898e1f8 | 545 | return NULL; |
272cd7a8 CS |
546 | |
547 | list = s->private; | |
548 | if (list_empty(list)) | |
7898e1f8 | 549 | return NULL; |
272cd7a8 CS |
550 | |
551 | if (s->index == 0) | |
552 | return list->next; | |
553 | return list; | |
7898e1f8 CS |
554 | } |
555 | ||
40809565 CS |
556 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
557 | struct list_head *head) | |
7898e1f8 CS |
558 | { |
559 | struct list_head *list = v; | |
560 | ||
40809565 | 561 | if (list_is_last(list, head)) { |
272cd7a8 | 562 | s->private = NULL; |
7898e1f8 CS |
563 | return NULL; |
564 | } | |
272cd7a8 | 565 | s->private = list->next; |
7898e1f8 CS |
566 | return list->next; |
567 | } | |
568 | ||
40809565 CS |
569 | static void smk_seq_stop(struct seq_file *s, void *v) |
570 | { | |
571 | /* No-op */ | |
572 | } | |
573 | ||
f7112e6c | 574 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 575 | { |
f7112e6c CS |
576 | /* |
577 | * Don't show any rules with label names too long for | |
578 | * interface file (/smack/load or /smack/load2) | |
579 | * because you should expect to be able to write | |
580 | * anything you read back. | |
581 | */ | |
582 | if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max) | |
583 | return; | |
7898e1f8 | 584 | |
65ee7f45 RK |
585 | if (srp->smk_access == 0) |
586 | return; | |
587 | ||
f7112e6c | 588 | seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object); |
7898e1f8 CS |
589 | |
590 | seq_putc(s, ' '); | |
591 | ||
592 | if (srp->smk_access & MAY_READ) | |
593 | seq_putc(s, 'r'); | |
594 | if (srp->smk_access & MAY_WRITE) | |
595 | seq_putc(s, 'w'); | |
596 | if (srp->smk_access & MAY_EXEC) | |
597 | seq_putc(s, 'x'); | |
598 | if (srp->smk_access & MAY_APPEND) | |
599 | seq_putc(s, 'a'); | |
600 | if (srp->smk_access & MAY_TRANSMUTE) | |
601 | seq_putc(s, 't'); | |
7898e1f8 CS |
602 | |
603 | seq_putc(s, '\n'); | |
f7112e6c CS |
604 | } |
605 | ||
606 | /* | |
607 | * Seq_file read operations for /smack/load | |
608 | */ | |
609 | ||
610 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
611 | { | |
612 | return smk_seq_start(s, pos, &smack_rule_list); | |
613 | } | |
614 | ||
615 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
616 | { | |
617 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
618 | } | |
619 | ||
620 | static int load_seq_show(struct seq_file *s, void *v) | |
621 | { | |
622 | struct list_head *list = v; | |
623 | struct smack_master_list *smlp = | |
624 | list_entry(list, struct smack_master_list, list); | |
625 | ||
626 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
627 | |
628 | return 0; | |
629 | } | |
630 | ||
7898e1f8 | 631 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
632 | .start = load2_seq_start, |
633 | .next = load2_seq_next, | |
7898e1f8 | 634 | .show = load_seq_show, |
40809565 | 635 | .stop = smk_seq_stop, |
7898e1f8 CS |
636 | }; |
637 | ||
638 | /** | |
639 | * smk_open_load - open() for /smack/load | |
640 | * @inode: inode structure representing file | |
641 | * @file: "load" file pointer | |
642 | * | |
643 | * For reading, use load_seq_* seq_file reading operations. | |
644 | */ | |
645 | static int smk_open_load(struct inode *inode, struct file *file) | |
646 | { | |
647 | return seq_open(file, &load_seq_ops); | |
648 | } | |
649 | ||
650 | /** | |
651 | * smk_write_load - write() for /smack/load | |
652 | * @file: file pointer, not actually used | |
653 | * @buf: where to get the data from | |
654 | * @count: bytes sent | |
655 | * @ppos: where to start - must be 0 | |
656 | * | |
657 | */ | |
658 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
659 | size_t count, loff_t *ppos) | |
660 | { | |
7898e1f8 CS |
661 | /* |
662 | * Must have privilege. | |
663 | * No partial writes. | |
664 | * Enough data must be present. | |
665 | */ | |
1880eff7 | 666 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
667 | return -EPERM; |
668 | ||
f7112e6c CS |
669 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
670 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
671 | } |
672 | ||
e114e473 CS |
673 | static const struct file_operations smk_load_ops = { |
674 | .open = smk_open_load, | |
675 | .read = seq_read, | |
676 | .llseek = seq_lseek, | |
677 | .write = smk_write_load, | |
cb622bbb | 678 | .release = seq_release, |
e114e473 CS |
679 | }; |
680 | ||
681 | /** | |
682 | * smk_cipso_doi - initialize the CIPSO domain | |
683 | */ | |
30aa4faf | 684 | static void smk_cipso_doi(void) |
e114e473 CS |
685 | { |
686 | int rc; | |
687 | struct cipso_v4_doi *doip; | |
6d3dc07c | 688 | struct netlbl_audit nai; |
e114e473 | 689 | |
6d3dc07c | 690 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 691 | |
6d3dc07c | 692 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
693 | if (rc != 0) |
694 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
695 | __func__, __LINE__, rc); | |
696 | ||
697 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
698 | if (doip == NULL) | |
699 | panic("smack: Failed to initialize cipso DOI.\n"); | |
700 | doip->map.std = NULL; | |
701 | doip->doi = smk_cipso_doi_value; | |
702 | doip->type = CIPSO_V4_MAP_PASS; | |
703 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
704 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
705 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
706 | ||
6d3dc07c | 707 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 708 | if (rc != 0) { |
6c2e8ac0 PM |
709 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
710 | __func__, __LINE__, rc); | |
711 | kfree(doip); | |
712 | return; | |
713 | } | |
6d3dc07c | 714 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
715 | if (rc != 0) { |
716 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 717 | __func__, __LINE__, rc); |
b1edeb10 | 718 | kfree(doip); |
6c2e8ac0 | 719 | return; |
b1edeb10 | 720 | } |
e114e473 CS |
721 | } |
722 | ||
4bc87e62 CS |
723 | /** |
724 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 725 | * @oldambient: previous domain string |
4bc87e62 | 726 | */ |
30aa4faf | 727 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
728 | { |
729 | int rc; | |
6d3dc07c | 730 | struct netlbl_audit nai; |
4bc87e62 | 731 | |
6d3dc07c | 732 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
733 | |
734 | if (oldambient != NULL) { | |
6d3dc07c | 735 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
736 | if (rc != 0) |
737 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
738 | __func__, __LINE__, rc); | |
739 | } | |
f7112e6c CS |
740 | if (smack_net_ambient == NULL) |
741 | smack_net_ambient = smack_known_floor.smk_known; | |
4bc87e62 | 742 | |
6d3dc07c CS |
743 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
744 | NULL, NULL, &nai); | |
4bc87e62 CS |
745 | if (rc != 0) |
746 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
747 | __func__, __LINE__, rc); | |
748 | } | |
749 | ||
e114e473 CS |
750 | /* |
751 | * Seq_file read operations for /smack/cipso | |
752 | */ | |
753 | ||
754 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
755 | { | |
40809565 | 756 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
757 | } |
758 | ||
759 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
760 | { | |
40809565 | 761 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
762 | } |
763 | ||
764 | /* | |
765 | * Print cipso labels in format: | |
766 | * label level[/cat[,cat]] | |
767 | */ | |
768 | static int cipso_seq_show(struct seq_file *s, void *v) | |
769 | { | |
7198e2ee EB |
770 | struct list_head *list = v; |
771 | struct smack_known *skp = | |
772 | list_entry(list, struct smack_known, list); | |
f7112e6c | 773 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 774 | char sep = '/'; |
e114e473 | 775 | int i; |
e114e473 | 776 | |
f7112e6c CS |
777 | /* |
778 | * Don't show a label that could not have been set using | |
779 | * /smack/cipso. This is in support of the notion that | |
780 | * anything read from /smack/cipso ought to be writeable | |
781 | * to /smack/cipso. | |
782 | * | |
783 | * /smack/cipso2 should be used instead. | |
784 | */ | |
785 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
786 | return 0; |
787 | ||
f7112e6c | 788 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 789 | |
f7112e6c CS |
790 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; |
791 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
792 | seq_printf(s, "%c%d", sep, i); | |
793 | sep = ','; | |
794 | } | |
e114e473 CS |
795 | |
796 | seq_putc(s, '\n'); | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
88e9d34c | 801 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 802 | .start = cipso_seq_start, |
e114e473 CS |
803 | .next = cipso_seq_next, |
804 | .show = cipso_seq_show, | |
40809565 | 805 | .stop = smk_seq_stop, |
e114e473 CS |
806 | }; |
807 | ||
808 | /** | |
809 | * smk_open_cipso - open() for /smack/cipso | |
810 | * @inode: inode structure representing file | |
811 | * @file: "cipso" file pointer | |
812 | * | |
813 | * Connect our cipso_seq_* operations with /smack/cipso | |
814 | * file_operations | |
815 | */ | |
816 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
817 | { | |
818 | return seq_open(file, &cipso_seq_ops); | |
819 | } | |
820 | ||
821 | /** | |
f7112e6c | 822 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 823 | * @file: file pointer, not actually used |
e114e473 CS |
824 | * @buf: where to get the data from |
825 | * @count: bytes sent | |
826 | * @ppos: where to start | |
f7112e6c | 827 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
828 | * |
829 | * Accepts only one cipso rule per write call. | |
830 | * Returns number of bytes written or error code, as appropriate | |
831 | */ | |
f7112e6c CS |
832 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
833 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
834 | { |
835 | struct smack_known *skp; | |
f7112e6c CS |
836 | struct netlbl_lsm_secattr ncats; |
837 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 838 | int maplevel; |
f7112e6c | 839 | unsigned int cat; |
e114e473 CS |
840 | int catlen; |
841 | ssize_t rc = -EINVAL; | |
842 | char *data = NULL; | |
843 | char *rule; | |
844 | int ret; | |
845 | int i; | |
846 | ||
847 | /* | |
848 | * Must have privilege. | |
849 | * No partial writes. | |
850 | * Enough data must be present. | |
851 | */ | |
1880eff7 | 852 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
853 | return -EPERM; |
854 | if (*ppos != 0) | |
855 | return -EINVAL; | |
f7112e6c CS |
856 | if (format == SMK_FIXED24_FMT && |
857 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
858 | return -EINVAL; |
859 | ||
860 | data = kzalloc(count + 1, GFP_KERNEL); | |
861 | if (data == NULL) | |
862 | return -ENOMEM; | |
863 | ||
864 | if (copy_from_user(data, buf, count) != 0) { | |
865 | rc = -EFAULT; | |
866 | goto unlockedout; | |
867 | } | |
868 | ||
869 | data[count] = '\0'; | |
870 | rule = data; | |
871 | /* | |
872 | * Only allow one writer at a time. Writes should be | |
873 | * quite rare and small in any case. | |
874 | */ | |
875 | mutex_lock(&smack_cipso_lock); | |
876 | ||
877 | skp = smk_import_entry(rule, 0); | |
878 | if (skp == NULL) | |
879 | goto out; | |
880 | ||
f7112e6c CS |
881 | if (format == SMK_FIXED24_FMT) |
882 | rule += SMK_LABELLEN; | |
883 | else | |
884 | rule += strlen(skp->smk_known); | |
885 | ||
e114e473 CS |
886 | ret = sscanf(rule, "%d", &maplevel); |
887 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
888 | goto out; | |
889 | ||
890 | rule += SMK_DIGITLEN; | |
891 | ret = sscanf(rule, "%d", &catlen); | |
892 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
893 | goto out; | |
894 | ||
f7112e6c CS |
895 | if (format == SMK_FIXED24_FMT && |
896 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
897 | goto out; |
898 | ||
899 | memset(mapcatset, 0, sizeof(mapcatset)); | |
900 | ||
901 | for (i = 0; i < catlen; i++) { | |
902 | rule += SMK_DIGITLEN; | |
f7112e6c | 903 | ret = sscanf(rule, "%u", &cat); |
e114e473 CS |
904 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) |
905 | goto out; | |
906 | ||
907 | smack_catset_bit(cat, mapcatset); | |
908 | } | |
909 | ||
f7112e6c CS |
910 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
911 | if (rc >= 0) { | |
912 | netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat); | |
913 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; | |
914 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
915 | rc = count; | |
e114e473 CS |
916 | } |
917 | ||
e114e473 CS |
918 | out: |
919 | mutex_unlock(&smack_cipso_lock); | |
920 | unlockedout: | |
921 | kfree(data); | |
922 | return rc; | |
923 | } | |
924 | ||
f7112e6c CS |
925 | /** |
926 | * smk_write_cipso - write() for /smack/cipso | |
927 | * @file: file pointer, not actually used | |
928 | * @buf: where to get the data from | |
929 | * @count: bytes sent | |
930 | * @ppos: where to start | |
931 | * | |
932 | * Accepts only one cipso rule per write call. | |
933 | * Returns number of bytes written or error code, as appropriate | |
934 | */ | |
935 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
936 | size_t count, loff_t *ppos) | |
937 | { | |
938 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
939 | } | |
940 | ||
e114e473 CS |
941 | static const struct file_operations smk_cipso_ops = { |
942 | .open = smk_open_cipso, | |
943 | .read = seq_read, | |
944 | .llseek = seq_lseek, | |
945 | .write = smk_write_cipso, | |
946 | .release = seq_release, | |
947 | }; | |
948 | ||
f7112e6c CS |
949 | /* |
950 | * Seq_file read operations for /smack/cipso2 | |
951 | */ | |
952 | ||
953 | /* | |
954 | * Print cipso labels in format: | |
955 | * label level[/cat[,cat]] | |
956 | */ | |
957 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
958 | { | |
959 | struct list_head *list = v; | |
960 | struct smack_known *skp = | |
961 | list_entry(list, struct smack_known, list); | |
962 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; | |
963 | char sep = '/'; | |
964 | int i; | |
965 | ||
966 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
967 | ||
968 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; | |
969 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
970 | seq_printf(s, "%c%d", sep, i); | |
971 | sep = ','; | |
972 | } | |
973 | ||
974 | seq_putc(s, '\n'); | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
979 | static const struct seq_operations cipso2_seq_ops = { | |
980 | .start = cipso_seq_start, | |
981 | .next = cipso_seq_next, | |
982 | .show = cipso2_seq_show, | |
983 | .stop = smk_seq_stop, | |
984 | }; | |
985 | ||
986 | /** | |
987 | * smk_open_cipso2 - open() for /smack/cipso2 | |
988 | * @inode: inode structure representing file | |
989 | * @file: "cipso2" file pointer | |
990 | * | |
991 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
992 | * file_operations | |
993 | */ | |
994 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
995 | { | |
996 | return seq_open(file, &cipso2_seq_ops); | |
997 | } | |
998 | ||
999 | /** | |
1000 | * smk_write_cipso2 - write() for /smack/cipso2 | |
1001 | * @file: file pointer, not actually used | |
1002 | * @buf: where to get the data from | |
1003 | * @count: bytes sent | |
1004 | * @ppos: where to start | |
1005 | * | |
1006 | * Accepts only one cipso rule per write call. | |
1007 | * Returns number of bytes written or error code, as appropriate | |
1008 | */ | |
1009 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1010 | size_t count, loff_t *ppos) | |
1011 | { | |
1012 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1013 | } | |
1014 | ||
1015 | static const struct file_operations smk_cipso2_ops = { | |
1016 | .open = smk_open_cipso2, | |
1017 | .read = seq_read, | |
1018 | .llseek = seq_lseek, | |
1019 | .write = smk_write_cipso2, | |
1020 | .release = seq_release, | |
1021 | }; | |
1022 | ||
6d3dc07c CS |
1023 | /* |
1024 | * Seq_file read operations for /smack/netlabel | |
1025 | */ | |
1026 | ||
1027 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
1028 | { | |
40809565 | 1029 | return smk_seq_start(s, pos, &smk_netlbladdr_list); |
6d3dc07c CS |
1030 | } |
1031 | ||
1032 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1033 | { | |
40809565 | 1034 | return smk_seq_next(s, v, pos, &smk_netlbladdr_list); |
6d3dc07c | 1035 | } |
6d3dc07c CS |
1036 | #define BEBITS (sizeof(__be32) * 8) |
1037 | ||
1038 | /* | |
1039 | * Print host/label pairs | |
1040 | */ | |
1041 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
1042 | { | |
7198e2ee EB |
1043 | struct list_head *list = v; |
1044 | struct smk_netlbladdr *skp = | |
1045 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 1046 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 1047 | int maskn; |
1048 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 1049 | |
113a0e45 | 1050 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
1051 | |
1052 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
1053 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | ||
88e9d34c | 1058 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c | 1059 | .start = netlbladdr_seq_start, |
6d3dc07c CS |
1060 | .next = netlbladdr_seq_next, |
1061 | .show = netlbladdr_seq_show, | |
40809565 | 1062 | .stop = smk_seq_stop, |
6d3dc07c CS |
1063 | }; |
1064 | ||
1065 | /** | |
1066 | * smk_open_netlbladdr - open() for /smack/netlabel | |
1067 | * @inode: inode structure representing file | |
1068 | * @file: "netlabel" file pointer | |
1069 | * | |
1070 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
1071 | * file_operations | |
1072 | */ | |
1073 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
1074 | { | |
1075 | return seq_open(file, &netlbladdr_seq_ops); | |
1076 | } | |
1077 | ||
113a0e45 | 1078 | /** |
1079 | * smk_netlbladdr_insert | |
1080 | * @new : netlabel to insert | |
1081 | * | |
1082 | * This helper insert netlabel in the smack_netlbladdrs list | |
1083 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
1084 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
1085 | * | |
113a0e45 | 1086 | */ |
1087 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
1088 | { | |
7198e2ee | 1089 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 1090 | |
7198e2ee EB |
1091 | if (list_empty(&smk_netlbladdr_list)) { |
1092 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1093 | return; |
1094 | } | |
1095 | ||
05725f7e JP |
1096 | m = list_entry_rcu(smk_netlbladdr_list.next, |
1097 | struct smk_netlbladdr, list); | |
7198e2ee | 1098 | |
113a0e45 | 1099 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
1100 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
1101 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1102 | return; |
1103 | } | |
7198e2ee EB |
1104 | |
1105 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
1106 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
1107 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1108 | return; |
1109 | } | |
05725f7e JP |
1110 | m_next = list_entry_rcu(m->list.next, |
1111 | struct smk_netlbladdr, list); | |
7198e2ee EB |
1112 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
1113 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1114 | return; |
1115 | } | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | ||
6d3dc07c CS |
1120 | /** |
1121 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 1122 | * @file: file pointer, not actually used |
6d3dc07c CS |
1123 | * @buf: where to get the data from |
1124 | * @count: bytes sent | |
1125 | * @ppos: where to start | |
1126 | * | |
1127 | * Accepts only one netlbladdr per write call. | |
1128 | * Returns number of bytes written or error code, as appropriate | |
1129 | */ | |
1130 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
1131 | size_t count, loff_t *ppos) | |
1132 | { | |
1133 | struct smk_netlbladdr *skp; | |
1134 | struct sockaddr_in newname; | |
f7112e6c | 1135 | char *smack; |
6d3dc07c | 1136 | char *sp; |
f7112e6c | 1137 | char *data; |
6d3dc07c CS |
1138 | char *host = (char *)&newname.sin_addr.s_addr; |
1139 | int rc; | |
1140 | struct netlbl_audit audit_info; | |
1141 | struct in_addr mask; | |
1142 | unsigned int m; | |
7198e2ee | 1143 | int found; |
113a0e45 | 1144 | u32 mask_bits = (1<<31); |
6d3dc07c | 1145 | __be32 nsa; |
113a0e45 | 1146 | u32 temp_mask; |
6d3dc07c CS |
1147 | |
1148 | /* | |
1149 | * Must have privilege. | |
1150 | * No partial writes. | |
1151 | * Enough data must be present. | |
1152 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1153 | * "<addr, as a.b.c.d><space><label>" | |
1154 | */ | |
1880eff7 | 1155 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1156 | return -EPERM; |
1157 | if (*ppos != 0) | |
1158 | return -EINVAL; | |
f7112e6c | 1159 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1160 | return -EINVAL; |
f7112e6c CS |
1161 | |
1162 | data = kzalloc(count + 1, GFP_KERNEL); | |
1163 | if (data == NULL) | |
1164 | return -ENOMEM; | |
1165 | ||
1166 | if (copy_from_user(data, buf, count) != 0) { | |
1167 | rc = -EFAULT; | |
1168 | goto free_data_out; | |
1169 | } | |
1170 | ||
1171 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1172 | if (smack == NULL) { | |
1173 | rc = -ENOMEM; | |
1174 | goto free_data_out; | |
1175 | } | |
6d3dc07c CS |
1176 | |
1177 | data[count] = '\0'; | |
1178 | ||
1179 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
1180 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
1181 | if (rc != 6) { | |
1182 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1183 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1184 | if (rc != 5) { |
1185 | rc = -EINVAL; | |
1186 | goto free_out; | |
1187 | } | |
6d3dc07c CS |
1188 | m = BEBITS; |
1189 | } | |
f7112e6c CS |
1190 | if (m > BEBITS) { |
1191 | rc = -EINVAL; | |
1192 | goto free_out; | |
1193 | } | |
6d3dc07c | 1194 | |
f7112e6c CS |
1195 | /* |
1196 | * If smack begins with '-', it is an option, don't import it | |
1197 | */ | |
4303154e EB |
1198 | if (smack[0] != '-') { |
1199 | sp = smk_import(smack, 0); | |
f7112e6c CS |
1200 | if (sp == NULL) { |
1201 | rc = -EINVAL; | |
1202 | goto free_out; | |
1203 | } | |
4303154e EB |
1204 | } else { |
1205 | /* check known options */ | |
1206 | if (strcmp(smack, smack_cipso_option) == 0) | |
1207 | sp = (char *)smack_cipso_option; | |
f7112e6c CS |
1208 | else { |
1209 | rc = -EINVAL; | |
1210 | goto free_out; | |
1211 | } | |
4303154e | 1212 | } |
6d3dc07c | 1213 | |
113a0e45 | 1214 | for (temp_mask = 0; m > 0; m--) { |
1215 | temp_mask |= mask_bits; | |
1216 | mask_bits >>= 1; | |
6d3dc07c | 1217 | } |
113a0e45 | 1218 | mask.s_addr = cpu_to_be32(temp_mask); |
1219 | ||
1220 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1221 | /* |
1222 | * Only allow one writer at a time. Writes should be | |
1223 | * quite rare and small in any case. | |
1224 | */ | |
1225 | mutex_lock(&smk_netlbladdr_lock); | |
1226 | ||
1227 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1228 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
1229 | found = 0; |
1230 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 1231 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
1232 | skp->smk_mask.s_addr == mask.s_addr) { |
1233 | found = 1; | |
6d3dc07c | 1234 | break; |
7198e2ee EB |
1235 | } |
1236 | } | |
6d3dc07c CS |
1237 | smk_netlabel_audit_set(&audit_info); |
1238 | ||
7198e2ee | 1239 | if (found == 0) { |
6d3dc07c CS |
1240 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
1241 | if (skp == NULL) | |
1242 | rc = -ENOMEM; | |
1243 | else { | |
1244 | rc = 0; | |
1245 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
1246 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 1247 | skp->smk_label = sp; |
113a0e45 | 1248 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
1249 | } |
1250 | } else { | |
4303154e | 1251 | /* we delete the unlabeled entry, only if the previous label |
25985edc | 1252 | * wasn't the special CIPSO option */ |
4303154e EB |
1253 | if (skp->smk_label != smack_cipso_option) |
1254 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
1255 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
1256 | PF_INET, &audit_info); | |
1257 | else | |
1258 | rc = 0; | |
6d3dc07c CS |
1259 | skp->smk_label = sp; |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * Now tell netlabel about the single label nature of | |
1264 | * this host so that incoming packets get labeled. | |
4303154e | 1265 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1266 | */ |
4303154e | 1267 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
1268 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
1269 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
1270 | smack_to_secid(skp->smk_label), &audit_info); | |
1271 | ||
1272 | if (rc == 0) | |
1273 | rc = count; | |
1274 | ||
1275 | mutex_unlock(&smk_netlbladdr_lock); | |
1276 | ||
f7112e6c CS |
1277 | free_out: |
1278 | kfree(smack); | |
1279 | free_data_out: | |
1280 | kfree(data); | |
1281 | ||
6d3dc07c CS |
1282 | return rc; |
1283 | } | |
1284 | ||
1285 | static const struct file_operations smk_netlbladdr_ops = { | |
1286 | .open = smk_open_netlbladdr, | |
1287 | .read = seq_read, | |
1288 | .llseek = seq_lseek, | |
1289 | .write = smk_write_netlbladdr, | |
1290 | .release = seq_release, | |
1291 | }; | |
1292 | ||
e114e473 CS |
1293 | /** |
1294 | * smk_read_doi - read() for /smack/doi | |
1295 | * @filp: file pointer, not actually used | |
1296 | * @buf: where to put the result | |
1297 | * @count: maximum to send along | |
1298 | * @ppos: where to start | |
1299 | * | |
1300 | * Returns number of bytes read or error code, as appropriate | |
1301 | */ | |
1302 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1303 | size_t count, loff_t *ppos) | |
1304 | { | |
1305 | char temp[80]; | |
1306 | ssize_t rc; | |
1307 | ||
1308 | if (*ppos != 0) | |
1309 | return 0; | |
1310 | ||
1311 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1312 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1313 | ||
1314 | return rc; | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1319 | * @file: file pointer, not actually used |
e114e473 CS |
1320 | * @buf: where to get the data from |
1321 | * @count: bytes sent | |
1322 | * @ppos: where to start | |
1323 | * | |
1324 | * Returns number of bytes written or error code, as appropriate | |
1325 | */ | |
1326 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1327 | size_t count, loff_t *ppos) | |
1328 | { | |
1329 | char temp[80]; | |
1330 | int i; | |
1331 | ||
1880eff7 | 1332 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1333 | return -EPERM; |
1334 | ||
1335 | if (count >= sizeof(temp) || count == 0) | |
1336 | return -EINVAL; | |
1337 | ||
1338 | if (copy_from_user(temp, buf, count) != 0) | |
1339 | return -EFAULT; | |
1340 | ||
1341 | temp[count] = '\0'; | |
1342 | ||
1343 | if (sscanf(temp, "%d", &i) != 1) | |
1344 | return -EINVAL; | |
1345 | ||
1346 | smk_cipso_doi_value = i; | |
1347 | ||
1348 | smk_cipso_doi(); | |
1349 | ||
1350 | return count; | |
1351 | } | |
1352 | ||
1353 | static const struct file_operations smk_doi_ops = { | |
1354 | .read = smk_read_doi, | |
1355 | .write = smk_write_doi, | |
6038f373 | 1356 | .llseek = default_llseek, |
e114e473 CS |
1357 | }; |
1358 | ||
1359 | /** | |
1360 | * smk_read_direct - read() for /smack/direct | |
1361 | * @filp: file pointer, not actually used | |
1362 | * @buf: where to put the result | |
1363 | * @count: maximum to send along | |
1364 | * @ppos: where to start | |
1365 | * | |
1366 | * Returns number of bytes read or error code, as appropriate | |
1367 | */ | |
1368 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1369 | size_t count, loff_t *ppos) | |
1370 | { | |
1371 | char temp[80]; | |
1372 | ssize_t rc; | |
1373 | ||
1374 | if (*ppos != 0) | |
1375 | return 0; | |
1376 | ||
1377 | sprintf(temp, "%d", smack_cipso_direct); | |
1378 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1379 | ||
1380 | return rc; | |
1381 | } | |
1382 | ||
1383 | /** | |
1384 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1385 | * @file: file pointer, not actually used |
e114e473 CS |
1386 | * @buf: where to get the data from |
1387 | * @count: bytes sent | |
1388 | * @ppos: where to start | |
1389 | * | |
1390 | * Returns number of bytes written or error code, as appropriate | |
1391 | */ | |
1392 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1393 | size_t count, loff_t *ppos) | |
1394 | { | |
f7112e6c | 1395 | struct smack_known *skp; |
e114e473 CS |
1396 | char temp[80]; |
1397 | int i; | |
1398 | ||
1880eff7 | 1399 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1400 | return -EPERM; |
1401 | ||
1402 | if (count >= sizeof(temp) || count == 0) | |
1403 | return -EINVAL; | |
1404 | ||
1405 | if (copy_from_user(temp, buf, count) != 0) | |
1406 | return -EFAULT; | |
1407 | ||
1408 | temp[count] = '\0'; | |
1409 | ||
1410 | if (sscanf(temp, "%d", &i) != 1) | |
1411 | return -EINVAL; | |
1412 | ||
f7112e6c CS |
1413 | /* |
1414 | * Don't do anything if the value hasn't actually changed. | |
1415 | * If it is changing reset the level on entries that were | |
1416 | * set up to be direct when they were created. | |
1417 | */ | |
1418 | if (smack_cipso_direct != i) { | |
1419 | mutex_lock(&smack_known_lock); | |
1420 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1421 | if (skp->smk_netlabel.attr.mls.lvl == | |
1422 | smack_cipso_direct) | |
1423 | skp->smk_netlabel.attr.mls.lvl = i; | |
1424 | smack_cipso_direct = i; | |
1425 | mutex_unlock(&smack_known_lock); | |
1426 | } | |
e114e473 CS |
1427 | |
1428 | return count; | |
1429 | } | |
1430 | ||
1431 | static const struct file_operations smk_direct_ops = { | |
1432 | .read = smk_read_direct, | |
1433 | .write = smk_write_direct, | |
6038f373 | 1434 | .llseek = default_llseek, |
e114e473 CS |
1435 | }; |
1436 | ||
f7112e6c CS |
1437 | /** |
1438 | * smk_read_mapped - read() for /smack/mapped | |
1439 | * @filp: file pointer, not actually used | |
1440 | * @buf: where to put the result | |
1441 | * @count: maximum to send along | |
1442 | * @ppos: where to start | |
1443 | * | |
1444 | * Returns number of bytes read or error code, as appropriate | |
1445 | */ | |
1446 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1447 | size_t count, loff_t *ppos) | |
1448 | { | |
1449 | char temp[80]; | |
1450 | ssize_t rc; | |
1451 | ||
1452 | if (*ppos != 0) | |
1453 | return 0; | |
1454 | ||
1455 | sprintf(temp, "%d", smack_cipso_mapped); | |
1456 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1457 | ||
1458 | return rc; | |
1459 | } | |
1460 | ||
1461 | /** | |
1462 | * smk_write_mapped - write() for /smack/mapped | |
1463 | * @file: file pointer, not actually used | |
1464 | * @buf: where to get the data from | |
1465 | * @count: bytes sent | |
1466 | * @ppos: where to start | |
1467 | * | |
1468 | * Returns number of bytes written or error code, as appropriate | |
1469 | */ | |
1470 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1471 | size_t count, loff_t *ppos) | |
1472 | { | |
1473 | struct smack_known *skp; | |
1474 | char temp[80]; | |
1475 | int i; | |
1476 | ||
1880eff7 | 1477 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1478 | return -EPERM; |
1479 | ||
1480 | if (count >= sizeof(temp) || count == 0) | |
1481 | return -EINVAL; | |
1482 | ||
1483 | if (copy_from_user(temp, buf, count) != 0) | |
1484 | return -EFAULT; | |
1485 | ||
1486 | temp[count] = '\0'; | |
1487 | ||
1488 | if (sscanf(temp, "%d", &i) != 1) | |
1489 | return -EINVAL; | |
1490 | ||
1491 | /* | |
1492 | * Don't do anything if the value hasn't actually changed. | |
1493 | * If it is changing reset the level on entries that were | |
1494 | * set up to be mapped when they were created. | |
1495 | */ | |
1496 | if (smack_cipso_mapped != i) { | |
1497 | mutex_lock(&smack_known_lock); | |
1498 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1499 | if (skp->smk_netlabel.attr.mls.lvl == | |
1500 | smack_cipso_mapped) | |
1501 | skp->smk_netlabel.attr.mls.lvl = i; | |
1502 | smack_cipso_mapped = i; | |
1503 | mutex_unlock(&smack_known_lock); | |
1504 | } | |
1505 | ||
1506 | return count; | |
1507 | } | |
1508 | ||
1509 | static const struct file_operations smk_mapped_ops = { | |
1510 | .read = smk_read_mapped, | |
1511 | .write = smk_write_mapped, | |
1512 | .llseek = default_llseek, | |
1513 | }; | |
1514 | ||
e114e473 CS |
1515 | /** |
1516 | * smk_read_ambient - read() for /smack/ambient | |
1517 | * @filp: file pointer, not actually used | |
1518 | * @buf: where to put the result | |
1519 | * @cn: maximum to send along | |
1520 | * @ppos: where to start | |
1521 | * | |
1522 | * Returns number of bytes read or error code, as appropriate | |
1523 | */ | |
1524 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1525 | size_t cn, loff_t *ppos) | |
1526 | { | |
1527 | ssize_t rc; | |
e114e473 CS |
1528 | int asize; |
1529 | ||
1530 | if (*ppos != 0) | |
1531 | return 0; | |
1532 | /* | |
1533 | * Being careful to avoid a problem in the case where | |
1534 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1535 | */ |
4bc87e62 | 1536 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1537 | |
4bc87e62 CS |
1538 | asize = strlen(smack_net_ambient) + 1; |
1539 | ||
1540 | if (cn >= asize) | |
1541 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1542 | smack_net_ambient, asize); | |
1543 | else | |
1544 | rc = -EINVAL; | |
e114e473 | 1545 | |
4bc87e62 | 1546 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1547 | |
1548 | return rc; | |
1549 | } | |
1550 | ||
1551 | /** | |
1552 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1553 | * @file: file pointer, not actually used |
e114e473 CS |
1554 | * @buf: where to get the data from |
1555 | * @count: bytes sent | |
1556 | * @ppos: where to start | |
1557 | * | |
1558 | * Returns number of bytes written or error code, as appropriate | |
1559 | */ | |
1560 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1561 | size_t count, loff_t *ppos) | |
1562 | { | |
4bc87e62 | 1563 | char *oldambient; |
f7112e6c CS |
1564 | char *smack = NULL; |
1565 | char *data; | |
1566 | int rc = count; | |
e114e473 | 1567 | |
1880eff7 | 1568 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1569 | return -EPERM; |
1570 | ||
f7112e6c CS |
1571 | data = kzalloc(count + 1, GFP_KERNEL); |
1572 | if (data == NULL) | |
1573 | return -ENOMEM; | |
e114e473 | 1574 | |
f7112e6c CS |
1575 | if (copy_from_user(data, buf, count) != 0) { |
1576 | rc = -EFAULT; | |
1577 | goto out; | |
1578 | } | |
e114e473 | 1579 | |
f7112e6c CS |
1580 | smack = smk_import(data, count); |
1581 | if (smack == NULL) { | |
1582 | rc = -EINVAL; | |
1583 | goto out; | |
1584 | } | |
e114e473 | 1585 | |
4bc87e62 CS |
1586 | mutex_lock(&smack_ambient_lock); |
1587 | ||
1588 | oldambient = smack_net_ambient; | |
e114e473 | 1589 | smack_net_ambient = smack; |
4bc87e62 CS |
1590 | smk_unlbl_ambient(oldambient); |
1591 | ||
1592 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1593 | |
f7112e6c CS |
1594 | out: |
1595 | kfree(data); | |
1596 | return rc; | |
e114e473 CS |
1597 | } |
1598 | ||
1599 | static const struct file_operations smk_ambient_ops = { | |
1600 | .read = smk_read_ambient, | |
1601 | .write = smk_write_ambient, | |
6038f373 | 1602 | .llseek = default_llseek, |
e114e473 CS |
1603 | }; |
1604 | ||
15446235 CS |
1605 | /** |
1606 | * smk_read_onlycap - read() for /smack/onlycap | |
1607 | * @filp: file pointer, not actually used | |
1608 | * @buf: where to put the result | |
1609 | * @cn: maximum to send along | |
1610 | * @ppos: where to start | |
1611 | * | |
1612 | * Returns number of bytes read or error code, as appropriate | |
1613 | */ | |
1614 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1615 | size_t cn, loff_t *ppos) | |
1616 | { | |
1617 | char *smack = ""; | |
1618 | ssize_t rc = -EINVAL; | |
1619 | int asize; | |
1620 | ||
1621 | if (*ppos != 0) | |
1622 | return 0; | |
1623 | ||
1624 | if (smack_onlycap != NULL) | |
1625 | smack = smack_onlycap; | |
1626 | ||
1627 | asize = strlen(smack) + 1; | |
1628 | ||
1629 | if (cn >= asize) | |
1630 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1631 | ||
1632 | return rc; | |
1633 | } | |
1634 | ||
1635 | /** | |
1636 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1637 | * @file: file pointer, not actually used |
15446235 CS |
1638 | * @buf: where to get the data from |
1639 | * @count: bytes sent | |
1640 | * @ppos: where to start | |
1641 | * | |
1642 | * Returns number of bytes written or error code, as appropriate | |
1643 | */ | |
1644 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1645 | size_t count, loff_t *ppos) | |
1646 | { | |
f7112e6c | 1647 | char *data; |
676dac4b | 1648 | char *sp = smk_of_task(current->cred->security); |
f7112e6c | 1649 | int rc = count; |
15446235 | 1650 | |
1880eff7 | 1651 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
1652 | return -EPERM; |
1653 | ||
1654 | /* | |
1655 | * This can be done using smk_access() but is done | |
1656 | * explicitly for clarity. The smk_access() implementation | |
1657 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1658 | */ | |
1659 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1660 | return -EPERM; | |
1661 | ||
f7112e6c CS |
1662 | data = kzalloc(count, GFP_KERNEL); |
1663 | if (data == NULL) | |
1664 | return -ENOMEM; | |
15446235 CS |
1665 | |
1666 | /* | |
1667 | * Should the null string be passed in unset the onlycap value. | |
1668 | * This seems like something to be careful with as usually | |
1669 | * smk_import only expects to return NULL for errors. It | |
1670 | * is usually the case that a nullstring or "\n" would be | |
1671 | * bad to pass to smk_import but in fact this is useful here. | |
f7112e6c CS |
1672 | * |
1673 | * smk_import will also reject a label beginning with '-', | |
1674 | * so "-usecapabilities" will also work. | |
15446235 | 1675 | */ |
f7112e6c CS |
1676 | if (copy_from_user(data, buf, count) != 0) |
1677 | rc = -EFAULT; | |
1678 | else | |
1679 | smack_onlycap = smk_import(data, count); | |
15446235 | 1680 | |
f7112e6c CS |
1681 | kfree(data); |
1682 | return rc; | |
15446235 CS |
1683 | } |
1684 | ||
1685 | static const struct file_operations smk_onlycap_ops = { | |
1686 | .read = smk_read_onlycap, | |
1687 | .write = smk_write_onlycap, | |
6038f373 | 1688 | .llseek = default_llseek, |
15446235 CS |
1689 | }; |
1690 | ||
ecfcc53f EB |
1691 | /** |
1692 | * smk_read_logging - read() for /smack/logging | |
1693 | * @filp: file pointer, not actually used | |
1694 | * @buf: where to put the result | |
1695 | * @cn: maximum to send along | |
1696 | * @ppos: where to start | |
1697 | * | |
1698 | * Returns number of bytes read or error code, as appropriate | |
1699 | */ | |
1700 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1701 | size_t count, loff_t *ppos) | |
1702 | { | |
1703 | char temp[32]; | |
1704 | ssize_t rc; | |
1705 | ||
1706 | if (*ppos != 0) | |
1707 | return 0; | |
1708 | ||
1709 | sprintf(temp, "%d\n", log_policy); | |
1710 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1711 | return rc; | |
1712 | } | |
1713 | ||
1714 | /** | |
1715 | * smk_write_logging - write() for /smack/logging | |
1716 | * @file: file pointer, not actually used | |
1717 | * @buf: where to get the data from | |
1718 | * @count: bytes sent | |
1719 | * @ppos: where to start | |
1720 | * | |
1721 | * Returns number of bytes written or error code, as appropriate | |
1722 | */ | |
1723 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1724 | size_t count, loff_t *ppos) | |
1725 | { | |
1726 | char temp[32]; | |
1727 | int i; | |
1728 | ||
1880eff7 | 1729 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
1730 | return -EPERM; |
1731 | ||
1732 | if (count >= sizeof(temp) || count == 0) | |
1733 | return -EINVAL; | |
1734 | ||
1735 | if (copy_from_user(temp, buf, count) != 0) | |
1736 | return -EFAULT; | |
1737 | ||
1738 | temp[count] = '\0'; | |
1739 | ||
1740 | if (sscanf(temp, "%d", &i) != 1) | |
1741 | return -EINVAL; | |
1742 | if (i < 0 || i > 3) | |
1743 | return -EINVAL; | |
1744 | log_policy = i; | |
1745 | return count; | |
1746 | } | |
1747 | ||
1748 | ||
1749 | ||
1750 | static const struct file_operations smk_logging_ops = { | |
1751 | .read = smk_read_logging, | |
1752 | .write = smk_write_logging, | |
6038f373 | 1753 | .llseek = default_llseek, |
ecfcc53f | 1754 | }; |
7898e1f8 CS |
1755 | |
1756 | /* | |
1757 | * Seq_file read operations for /smack/load-self | |
1758 | */ | |
1759 | ||
1760 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
1761 | { | |
1762 | struct task_smack *tsp = current_security(); | |
1763 | ||
40809565 | 1764 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
1765 | } |
1766 | ||
1767 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1768 | { | |
1769 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 1770 | |
40809565 | 1771 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
1772 | } |
1773 | ||
1774 | static int load_self_seq_show(struct seq_file *s, void *v) | |
1775 | { | |
1776 | struct list_head *list = v; | |
1777 | struct smack_rule *srp = | |
1778 | list_entry(list, struct smack_rule, list); | |
1779 | ||
f7112e6c | 1780 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
1781 | |
1782 | return 0; | |
1783 | } | |
1784 | ||
7898e1f8 CS |
1785 | static const struct seq_operations load_self_seq_ops = { |
1786 | .start = load_self_seq_start, | |
1787 | .next = load_self_seq_next, | |
1788 | .show = load_self_seq_show, | |
40809565 | 1789 | .stop = smk_seq_stop, |
7898e1f8 CS |
1790 | }; |
1791 | ||
1792 | ||
1793 | /** | |
f7112e6c | 1794 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
1795 | * @inode: inode structure representing file |
1796 | * @file: "load" file pointer | |
1797 | * | |
1798 | * For reading, use load_seq_* seq_file reading operations. | |
1799 | */ | |
1800 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
1801 | { | |
1802 | return seq_open(file, &load_self_seq_ops); | |
1803 | } | |
1804 | ||
1805 | /** | |
1806 | * smk_write_load_self - write() for /smack/load-self | |
1807 | * @file: file pointer, not actually used | |
1808 | * @buf: where to get the data from | |
1809 | * @count: bytes sent | |
1810 | * @ppos: where to start - must be 0 | |
1811 | * | |
1812 | */ | |
1813 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
1814 | size_t count, loff_t *ppos) | |
1815 | { | |
1816 | struct task_smack *tsp = current_security(); | |
1817 | ||
f7112e6c CS |
1818 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
1819 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
1820 | } |
1821 | ||
1822 | static const struct file_operations smk_load_self_ops = { | |
1823 | .open = smk_open_load_self, | |
1824 | .read = seq_read, | |
1825 | .llseek = seq_lseek, | |
1826 | .write = smk_write_load_self, | |
1827 | .release = seq_release, | |
1828 | }; | |
828716c2 JS |
1829 | |
1830 | /** | |
f7112e6c | 1831 | * smk_user_access - handle access check transaction |
828716c2 JS |
1832 | * @file: file pointer |
1833 | * @buf: data from user space | |
1834 | * @count: bytes sent | |
1835 | * @ppos: where to start - must be 0 | |
1836 | */ | |
f7112e6c CS |
1837 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
1838 | size_t count, loff_t *ppos, int format) | |
828716c2 | 1839 | { |
e05b6f98 | 1840 | struct smack_parsed_rule rule; |
828716c2 | 1841 | char *data; |
f7112e6c | 1842 | char *cod; |
f8859d98 | 1843 | int res; |
828716c2 | 1844 | |
828716c2 JS |
1845 | data = simple_transaction_get(file, buf, count); |
1846 | if (IS_ERR(data)) | |
1847 | return PTR_ERR(data); | |
1848 | ||
f7112e6c CS |
1849 | if (format == SMK_FIXED24_FMT) { |
1850 | if (count < SMK_LOADLEN) | |
1851 | return -EINVAL; | |
1852 | res = smk_parse_rule(data, &rule, 0); | |
1853 | } else { | |
1854 | /* | |
1855 | * Copy the data to make sure the string is terminated. | |
1856 | */ | |
1857 | cod = kzalloc(count + 1, GFP_KERNEL); | |
1858 | if (cod == NULL) | |
1859 | return -ENOMEM; | |
1860 | memcpy(cod, data, count); | |
1861 | cod[count] = '\0'; | |
e05b6f98 | 1862 | res = smk_parse_long_rule(cod, &rule, 0, 0); |
f7112e6c CS |
1863 | kfree(cod); |
1864 | } | |
1865 | ||
1866 | if (res) | |
828716c2 JS |
1867 | return -EINVAL; |
1868 | ||
e05b6f98 | 1869 | res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access1, |
f8859d98 JS |
1870 | NULL); |
1871 | data[0] = res == 0 ? '1' : '0'; | |
1872 | data[1] = '\0'; | |
828716c2 | 1873 | |
d86b2b61 | 1874 | simple_transaction_set(file, 2); |
f7112e6c CS |
1875 | |
1876 | if (format == SMK_FIXED24_FMT) | |
1877 | return SMK_LOADLEN; | |
1878 | return count; | |
1879 | } | |
1880 | ||
1881 | /** | |
1882 | * smk_write_access - handle access check transaction | |
1883 | * @file: file pointer | |
1884 | * @buf: data from user space | |
1885 | * @count: bytes sent | |
1886 | * @ppos: where to start - must be 0 | |
1887 | */ | |
1888 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
1889 | size_t count, loff_t *ppos) | |
1890 | { | |
1891 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
1892 | } |
1893 | ||
1894 | static const struct file_operations smk_access_ops = { | |
1895 | .write = smk_write_access, | |
1896 | .read = simple_transaction_read, | |
1897 | .release = simple_transaction_release, | |
1898 | .llseek = generic_file_llseek, | |
1899 | }; | |
1900 | ||
f7112e6c CS |
1901 | |
1902 | /* | |
1903 | * Seq_file read operations for /smack/load2 | |
1904 | */ | |
1905 | ||
1906 | static int load2_seq_show(struct seq_file *s, void *v) | |
1907 | { | |
1908 | struct list_head *list = v; | |
1909 | struct smack_master_list *smlp = | |
1910 | list_entry(list, struct smack_master_list, list); | |
1911 | ||
1912 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
1913 | ||
1914 | return 0; | |
1915 | } | |
1916 | ||
1917 | static const struct seq_operations load2_seq_ops = { | |
1918 | .start = load2_seq_start, | |
1919 | .next = load2_seq_next, | |
1920 | .show = load2_seq_show, | |
1921 | .stop = smk_seq_stop, | |
1922 | }; | |
1923 | ||
1924 | /** | |
1925 | * smk_open_load2 - open() for /smack/load2 | |
1926 | * @inode: inode structure representing file | |
1927 | * @file: "load2" file pointer | |
1928 | * | |
1929 | * For reading, use load2_seq_* seq_file reading operations. | |
1930 | */ | |
1931 | static int smk_open_load2(struct inode *inode, struct file *file) | |
1932 | { | |
1933 | return seq_open(file, &load2_seq_ops); | |
1934 | } | |
1935 | ||
1936 | /** | |
1937 | * smk_write_load2 - write() for /smack/load2 | |
1938 | * @file: file pointer, not actually used | |
1939 | * @buf: where to get the data from | |
1940 | * @count: bytes sent | |
1941 | * @ppos: where to start - must be 0 | |
1942 | * | |
1943 | */ | |
1944 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
1945 | size_t count, loff_t *ppos) | |
1946 | { | |
1947 | /* | |
1948 | * Must have privilege. | |
1949 | */ | |
1880eff7 | 1950 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1951 | return -EPERM; |
1952 | ||
1953 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
1954 | SMK_LONG_FMT); | |
1955 | } | |
1956 | ||
1957 | static const struct file_operations smk_load2_ops = { | |
1958 | .open = smk_open_load2, | |
1959 | .read = seq_read, | |
1960 | .llseek = seq_lseek, | |
1961 | .write = smk_write_load2, | |
1962 | .release = seq_release, | |
1963 | }; | |
1964 | ||
1965 | /* | |
1966 | * Seq_file read operations for /smack/load-self2 | |
1967 | */ | |
1968 | ||
1969 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
1970 | { | |
1971 | struct task_smack *tsp = current_security(); | |
1972 | ||
1973 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
1974 | } | |
1975 | ||
1976 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1977 | { | |
1978 | struct task_smack *tsp = current_security(); | |
1979 | ||
1980 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
1981 | } | |
1982 | ||
1983 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
1984 | { | |
1985 | struct list_head *list = v; | |
1986 | struct smack_rule *srp = | |
1987 | list_entry(list, struct smack_rule, list); | |
1988 | ||
1989 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
1990 | ||
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | static const struct seq_operations load_self2_seq_ops = { | |
1995 | .start = load_self2_seq_start, | |
1996 | .next = load_self2_seq_next, | |
1997 | .show = load_self2_seq_show, | |
1998 | .stop = smk_seq_stop, | |
1999 | }; | |
2000 | ||
2001 | /** | |
2002 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2003 | * @inode: inode structure representing file | |
2004 | * @file: "load" file pointer | |
2005 | * | |
2006 | * For reading, use load_seq_* seq_file reading operations. | |
2007 | */ | |
2008 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2009 | { | |
2010 | return seq_open(file, &load_self2_seq_ops); | |
2011 | } | |
2012 | ||
2013 | /** | |
2014 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2015 | * @file: file pointer, not actually used | |
2016 | * @buf: where to get the data from | |
2017 | * @count: bytes sent | |
2018 | * @ppos: where to start - must be 0 | |
2019 | * | |
2020 | */ | |
2021 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2022 | size_t count, loff_t *ppos) | |
2023 | { | |
2024 | struct task_smack *tsp = current_security(); | |
2025 | ||
2026 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2027 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2028 | } | |
2029 | ||
2030 | static const struct file_operations smk_load_self2_ops = { | |
2031 | .open = smk_open_load_self2, | |
2032 | .read = seq_read, | |
2033 | .llseek = seq_lseek, | |
2034 | .write = smk_write_load_self2, | |
2035 | .release = seq_release, | |
2036 | }; | |
2037 | ||
2038 | /** | |
2039 | * smk_write_access2 - handle access check transaction | |
2040 | * @file: file pointer | |
2041 | * @buf: data from user space | |
2042 | * @count: bytes sent | |
2043 | * @ppos: where to start - must be 0 | |
2044 | */ | |
2045 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2046 | size_t count, loff_t *ppos) | |
2047 | { | |
2048 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2049 | } | |
2050 | ||
2051 | static const struct file_operations smk_access2_ops = { | |
2052 | .write = smk_write_access2, | |
2053 | .read = simple_transaction_read, | |
2054 | .release = simple_transaction_release, | |
2055 | .llseek = generic_file_llseek, | |
2056 | }; | |
2057 | ||
449543b0 RK |
2058 | /** |
2059 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2060 | * @file: file pointer | |
2061 | * @buf: data from user space | |
2062 | * @count: bytes sent | |
2063 | * @ppos: where to start - must be 0 | |
2064 | */ | |
2065 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2066 | size_t count, loff_t *ppos) | |
2067 | { | |
2068 | char *data = NULL; | |
2069 | const char *cp = NULL; | |
2070 | struct smack_known *skp; | |
2071 | struct smack_rule *sp; | |
2072 | struct list_head *rule_list; | |
2073 | struct mutex *rule_lock; | |
2074 | int rc = count; | |
2075 | ||
2076 | if (*ppos != 0) | |
2077 | return -EINVAL; | |
2078 | ||
2079 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2080 | return -EPERM; | |
2081 | ||
2082 | if (count == 0 || count > SMK_LONGLABEL) | |
2083 | return -EINVAL; | |
2084 | ||
2085 | data = kzalloc(count, GFP_KERNEL); | |
2086 | if (data == NULL) | |
2087 | return -ENOMEM; | |
2088 | ||
2089 | if (copy_from_user(data, buf, count) != 0) { | |
2090 | rc = -EFAULT; | |
2091 | goto free_out; | |
2092 | } | |
2093 | ||
2094 | cp = smk_parse_smack(data, count); | |
2095 | if (cp == NULL) { | |
2096 | rc = -EINVAL; | |
2097 | goto free_out; | |
2098 | } | |
2099 | ||
2100 | skp = smk_find_entry(cp); | |
d15d9fad | 2101 | if (skp == NULL) |
449543b0 | 2102 | goto free_out; |
449543b0 RK |
2103 | |
2104 | rule_list = &skp->smk_rules; | |
2105 | rule_lock = &skp->smk_rules_lock; | |
2106 | ||
2107 | mutex_lock(rule_lock); | |
2108 | ||
2109 | list_for_each_entry_rcu(sp, rule_list, list) | |
2110 | sp->smk_access = 0; | |
2111 | ||
2112 | mutex_unlock(rule_lock); | |
2113 | ||
2114 | free_out: | |
2115 | kfree(data); | |
2116 | kfree(cp); | |
2117 | return rc; | |
2118 | } | |
2119 | ||
2120 | static const struct file_operations smk_revoke_subj_ops = { | |
2121 | .write = smk_write_revoke_subj, | |
2122 | .read = simple_transaction_read, | |
2123 | .release = simple_transaction_release, | |
2124 | .llseek = generic_file_llseek, | |
2125 | }; | |
2126 | ||
e9307237 CS |
2127 | static struct kset *smackfs_kset; |
2128 | /** | |
2129 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2130 | * | |
2131 | */ | |
2132 | static int smk_init_sysfs(void) | |
2133 | { | |
2134 | smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj); | |
2135 | if (!smackfs_kset) | |
2136 | return -ENOMEM; | |
2137 | return 0; | |
2138 | } | |
2139 | ||
e05b6f98 RK |
2140 | /** |
2141 | * smk_write_change_rule - write() for /smack/change-rule | |
2142 | * @file: file pointer | |
2143 | * @buf: data from user space | |
2144 | * @count: bytes sent | |
2145 | * @ppos: where to start - must be 0 | |
2146 | */ | |
2147 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2148 | size_t count, loff_t *ppos) | |
2149 | { | |
2150 | /* | |
2151 | * Must have privilege. | |
2152 | */ | |
2153 | if (!capable(CAP_MAC_ADMIN)) | |
2154 | return -EPERM; | |
2155 | ||
2156 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2157 | SMK_CHANGE_FMT); | |
2158 | } | |
2159 | ||
2160 | static const struct file_operations smk_change_rule_ops = { | |
2161 | .write = smk_write_change_rule, | |
2162 | .read = simple_transaction_read, | |
2163 | .release = simple_transaction_release, | |
2164 | .llseek = generic_file_llseek, | |
2165 | }; | |
2166 | ||
e114e473 CS |
2167 | /** |
2168 | * smk_fill_super - fill the /smackfs superblock | |
2169 | * @sb: the empty superblock | |
2170 | * @data: unused | |
2171 | * @silent: unused | |
2172 | * | |
2173 | * Fill in the well known entries for /smack | |
2174 | * | |
2175 | * Returns 0 on success, an error code on failure | |
2176 | */ | |
2177 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2178 | { | |
2179 | int rc; | |
2180 | struct inode *root_inode; | |
2181 | ||
2182 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
2183 | [SMK_LOAD] = { |
2184 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2185 | [SMK_CIPSO] = { | |
2186 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2187 | [SMK_DOI] = { | |
2188 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2189 | [SMK_DIRECT] = { | |
2190 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2191 | [SMK_AMBIENT] = { | |
2192 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
2193 | [SMK_NETLBLADDR] = { | |
2194 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
2195 | [SMK_ONLYCAP] = { | |
2196 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2197 | [SMK_LOGGING] = { | |
2198 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2199 | [SMK_LOAD_SELF] = { | |
2200 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2201 | [SMK_ACCESSES] = { |
0e94ae17 | 2202 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2203 | [SMK_MAPPED] = { |
2204 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2205 | [SMK_LOAD2] = { | |
2206 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2207 | [SMK_LOAD_SELF2] = { | |
2208 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2209 | [SMK_ACCESS2] = { | |
2210 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2211 | [SMK_CIPSO2] = { | |
2212 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2213 | [SMK_REVOKE_SUBJ] = { |
2214 | "revoke-subject", &smk_revoke_subj_ops, | |
2215 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2216 | [SMK_CHANGE_RULE] = { |
2217 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2218 | /* last one */ |
2219 | {""} | |
e114e473 CS |
2220 | }; |
2221 | ||
2222 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2223 | if (rc != 0) { | |
2224 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2225 | __func__, rc); | |
2226 | return rc; | |
2227 | } | |
2228 | ||
2229 | root_inode = sb->s_root->d_inode; | |
e114e473 CS |
2230 | |
2231 | return 0; | |
2232 | } | |
2233 | ||
2234 | /** | |
fc14f2fe | 2235 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2236 | * @fs_type: passed along without comment |
2237 | * @flags: passed along without comment | |
2238 | * @dev_name: passed along without comment | |
2239 | * @data: passed along without comment | |
e114e473 CS |
2240 | * |
2241 | * Just passes everything along. | |
2242 | * | |
2243 | * Returns what the lower level code does. | |
2244 | */ | |
fc14f2fe AV |
2245 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2246 | int flags, const char *dev_name, void *data) | |
e114e473 | 2247 | { |
fc14f2fe | 2248 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2249 | } |
2250 | ||
2251 | static struct file_system_type smk_fs_type = { | |
2252 | .name = "smackfs", | |
fc14f2fe | 2253 | .mount = smk_mount, |
e114e473 CS |
2254 | .kill_sb = kill_litter_super, |
2255 | }; | |
2256 | ||
2257 | static struct vfsmount *smackfs_mount; | |
2258 | ||
f7112e6c CS |
2259 | static int __init smk_preset_netlabel(struct smack_known *skp) |
2260 | { | |
2261 | skp->smk_netlabel.domain = skp->smk_known; | |
2262 | skp->smk_netlabel.flags = | |
2263 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
2264 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
2265 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
2266 | } | |
2267 | ||
e114e473 CS |
2268 | /** |
2269 | * init_smk_fs - get the smackfs superblock | |
2270 | * | |
2271 | * register the smackfs | |
2272 | * | |
076c54c5 AD |
2273 | * Do not register smackfs if Smack wasn't enabled |
2274 | * on boot. We can not put this method normally under the | |
2275 | * smack_init() code path since the security subsystem get | |
2276 | * initialized before the vfs caches. | |
2277 | * | |
2278 | * Returns true if we were not chosen on boot or if | |
2279 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2280 | */ |
2281 | static int __init init_smk_fs(void) | |
2282 | { | |
2283 | int err; | |
f7112e6c | 2284 | int rc; |
e114e473 | 2285 | |
076c54c5 AD |
2286 | if (!security_module_enable(&smack_ops)) |
2287 | return 0; | |
2288 | ||
e9307237 CS |
2289 | err = smk_init_sysfs(); |
2290 | if (err) | |
2291 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
2292 | ||
e114e473 CS |
2293 | err = register_filesystem(&smk_fs_type); |
2294 | if (!err) { | |
2295 | smackfs_mount = kern_mount(&smk_fs_type); | |
2296 | if (IS_ERR(smackfs_mount)) { | |
2297 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
2298 | err = PTR_ERR(smackfs_mount); | |
2299 | smackfs_mount = NULL; | |
2300 | } | |
2301 | } | |
2302 | ||
e114e473 | 2303 | smk_cipso_doi(); |
4bc87e62 | 2304 | smk_unlbl_ambient(NULL); |
e114e473 | 2305 | |
f7112e6c CS |
2306 | rc = smk_preset_netlabel(&smack_known_floor); |
2307 | if (err == 0 && rc < 0) | |
2308 | err = rc; | |
2309 | rc = smk_preset_netlabel(&smack_known_hat); | |
2310 | if (err == 0 && rc < 0) | |
2311 | err = rc; | |
2312 | rc = smk_preset_netlabel(&smack_known_huh); | |
2313 | if (err == 0 && rc < 0) | |
2314 | err = rc; | |
2315 | rc = smk_preset_netlabel(&smack_known_invalid); | |
2316 | if (err == 0 && rc < 0) | |
2317 | err = rc; | |
2318 | rc = smk_preset_netlabel(&smack_known_star); | |
2319 | if (err == 0 && rc < 0) | |
2320 | err = rc; | |
2321 | rc = smk_preset_netlabel(&smack_known_web); | |
2322 | if (err == 0 && rc < 0) | |
2323 | err = rc; | |
2324 | ||
e114e473 CS |
2325 | return err; |
2326 | } | |
2327 | ||
2328 | __initcall(init_smk_fs); |