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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 | */ | |
2f823ff8 | 69 | struct smack_known *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 | 114 | struct smack_parsed_rule { |
2f823ff8 | 115 | struct smack_known *smk_subject; |
e05b6f98 RK |
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 | { | |
2f823ff8 CS |
166 | struct smack_known *skp = smk_of_current(); |
167 | ||
6d3dc07c CS |
168 | nap->loginuid = audit_get_loginuid(current); |
169 | nap->sessionid = audit_get_sessionid(current); | |
2f823ff8 | 170 | nap->secid = skp->smk_secid; |
6d3dc07c CS |
171 | } |
172 | ||
173 | /* | |
f7112e6c | 174 | * Value for parsing single label host rules |
6d3dc07c | 175 | * "1.2.3.4 X" |
6d3dc07c CS |
176 | */ |
177 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 178 | |
e114e473 | 179 | /** |
e05b6f98 RK |
180 | * smk_set_access - add a rule to the rule list or replace an old rule |
181 | * @srp: the rule to add or replace | |
7898e1f8 CS |
182 | * @rule_list: the list of rules |
183 | * @rule_lock: the rule list lock | |
e05b6f98 | 184 | * @global: if non-zero, indicates a global rule |
e114e473 CS |
185 | * |
186 | * Looks through the current subject/object/access list for | |
187 | * the subject/object pair and replaces the access that was | |
188 | * there. If the pair isn't found add it with the specified | |
189 | * access. | |
81ea714b SL |
190 | * |
191 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
192 | * during the allocation of the new pair to add. | |
e114e473 | 193 | */ |
e05b6f98 RK |
194 | static int smk_set_access(struct smack_parsed_rule *srp, |
195 | struct list_head *rule_list, | |
196 | struct mutex *rule_lock, int global) | |
e114e473 | 197 | { |
7198e2ee | 198 | struct smack_rule *sp; |
e05b6f98 | 199 | struct smack_master_list *smlp; |
7898e1f8 | 200 | int found = 0; |
e05b6f98 | 201 | int rc = 0; |
e114e473 | 202 | |
7898e1f8 CS |
203 | mutex_lock(rule_lock); |
204 | ||
272cd7a8 CS |
205 | /* |
206 | * Because the object label is less likely to match | |
207 | * than the subject label check it first | |
208 | */ | |
7898e1f8 | 209 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
210 | if (sp->smk_object == srp->smk_object && |
211 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee | 212 | found = 1; |
e05b6f98 RK |
213 | sp->smk_access |= srp->smk_access1; |
214 | sp->smk_access &= ~srp->smk_access2; | |
e114e473 CS |
215 | break; |
216 | } | |
e114e473 CS |
217 | } |
218 | ||
e05b6f98 RK |
219 | if (found == 0) { |
220 | sp = kzalloc(sizeof(*sp), GFP_KERNEL); | |
221 | if (sp == NULL) { | |
222 | rc = -ENOMEM; | |
223 | goto out; | |
224 | } | |
225 | ||
226 | sp->smk_subject = srp->smk_subject; | |
227 | sp->smk_object = srp->smk_object; | |
228 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; | |
229 | ||
230 | list_add_rcu(&sp->list, rule_list); | |
231 | /* | |
232 | * If this is a global as opposed to self and a new rule | |
233 | * it needs to get added for reporting. | |
234 | */ | |
235 | if (global) { | |
236 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
237 | if (smlp != NULL) { | |
238 | smlp->smk_rule = sp; | |
239 | list_add_rcu(&smlp->list, &smack_rule_list); | |
240 | } else | |
241 | rc = -ENOMEM; | |
242 | } | |
243 | } | |
244 | ||
245 | out: | |
7898e1f8 | 246 | mutex_unlock(rule_lock); |
e05b6f98 RK |
247 | return rc; |
248 | } | |
249 | ||
250 | /** | |
251 | * smk_perm_from_str - parse smack accesses from a text string | |
252 | * @string: a text string that contains a Smack accesses code | |
253 | * | |
254 | * Returns an integer with respective bits set for specified accesses. | |
255 | */ | |
256 | static int smk_perm_from_str(const char *string) | |
257 | { | |
258 | int perm = 0; | |
259 | const char *cp; | |
e114e473 | 260 | |
e05b6f98 RK |
261 | for (cp = string; ; cp++) |
262 | switch (*cp) { | |
263 | case '-': | |
264 | break; | |
265 | case 'r': | |
266 | case 'R': | |
267 | perm |= MAY_READ; | |
268 | break; | |
269 | case 'w': | |
270 | case 'W': | |
271 | perm |= MAY_WRITE; | |
272 | break; | |
273 | case 'x': | |
274 | case 'X': | |
275 | perm |= MAY_EXEC; | |
276 | break; | |
277 | case 'a': | |
278 | case 'A': | |
279 | perm |= MAY_APPEND; | |
280 | break; | |
281 | case 't': | |
282 | case 'T': | |
283 | perm |= MAY_TRANSMUTE; | |
284 | break; | |
285 | default: | |
286 | return perm; | |
287 | } | |
e114e473 CS |
288 | } |
289 | ||
290 | /** | |
f7112e6c CS |
291 | * smk_fill_rule - Fill Smack rule from strings |
292 | * @subject: subject label string | |
293 | * @object: object label string | |
e05b6f98 RK |
294 | * @access1: access string |
295 | * @access2: string with permissions to be removed | |
0e94ae17 JS |
296 | * @rule: Smack rule |
297 | * @import: if non-zero, import labels | |
3518721a | 298 | * @len: label length limit |
f7112e6c CS |
299 | * |
300 | * Returns 0 on success, -1 on failure | |
e114e473 | 301 | */ |
f7112e6c | 302 | static int smk_fill_rule(const char *subject, const char *object, |
e05b6f98 RK |
303 | const char *access1, const char *access2, |
304 | struct smack_parsed_rule *rule, int import, | |
305 | int len) | |
e114e473 | 306 | { |
f7112e6c | 307 | const char *cp; |
0e94ae17 | 308 | struct smack_known *skp; |
e114e473 | 309 | |
0e94ae17 | 310 | if (import) { |
2f823ff8 | 311 | rule->smk_subject = smk_import_entry(subject, len); |
0e94ae17 JS |
312 | if (rule->smk_subject == NULL) |
313 | return -1; | |
314 | ||
3518721a | 315 | rule->smk_object = smk_import(object, len); |
0e94ae17 JS |
316 | if (rule->smk_object == NULL) |
317 | return -1; | |
318 | } else { | |
3518721a | 319 | cp = smk_parse_smack(subject, len); |
f7112e6c CS |
320 | if (cp == NULL) |
321 | return -1; | |
322 | skp = smk_find_entry(cp); | |
323 | kfree(cp); | |
0e94ae17 JS |
324 | if (skp == NULL) |
325 | return -1; | |
2f823ff8 | 326 | rule->smk_subject = skp; |
0e94ae17 | 327 | |
3518721a | 328 | cp = smk_parse_smack(object, len); |
f7112e6c CS |
329 | if (cp == NULL) |
330 | return -1; | |
331 | skp = smk_find_entry(cp); | |
332 | kfree(cp); | |
0e94ae17 JS |
333 | if (skp == NULL) |
334 | return -1; | |
335 | rule->smk_object = skp->smk_known; | |
336 | } | |
7198e2ee | 337 | |
e05b6f98 RK |
338 | rule->smk_access1 = smk_perm_from_str(access1); |
339 | if (access2) | |
340 | rule->smk_access2 = smk_perm_from_str(access2); | |
341 | else | |
342 | rule->smk_access2 = ~rule->smk_access1; | |
e114e473 | 343 | |
3518721a | 344 | return 0; |
f7112e6c | 345 | } |
e114e473 | 346 | |
f7112e6c CS |
347 | /** |
348 | * smk_parse_rule - parse Smack rule from load string | |
349 | * @data: string to be parsed whose size is SMK_LOADLEN | |
350 | * @rule: Smack rule | |
351 | * @import: if non-zero, import labels | |
352 | * | |
353 | * Returns 0 on success, -1 on errors. | |
354 | */ | |
e05b6f98 RK |
355 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
356 | int import) | |
f7112e6c CS |
357 | { |
358 | int rc; | |
e114e473 | 359 | |
f7112e6c | 360 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
e05b6f98 RK |
361 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
362 | import, SMK_LABELLEN); | |
f7112e6c CS |
363 | return rc; |
364 | } | |
e114e473 | 365 | |
f7112e6c CS |
366 | /** |
367 | * smk_parse_long_rule - parse Smack rule from rule string | |
368 | * @data: string to be parsed, null terminated | |
e05b6f98 | 369 | * @rule: Will be filled with Smack parsed rule |
f7112e6c | 370 | * @import: if non-zero, import labels |
10289b0f | 371 | * @tokens: numer of substrings expected in data |
f7112e6c | 372 | * |
10289b0f | 373 | * Returns number of processed bytes on success, -1 on failure. |
f7112e6c | 374 | */ |
10289b0f RK |
375 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
376 | int import, int tokens) | |
f7112e6c | 377 | { |
10289b0f RK |
378 | ssize_t cnt = 0; |
379 | char *tok[4]; | |
380 | int i; | |
381 | ||
382 | /* | |
383 | * Parsing the rule in-place, filling all white-spaces with '\0' | |
384 | */ | |
385 | for (i = 0; i < tokens; ++i) { | |
386 | while (isspace(data[cnt])) | |
387 | data[cnt++] = '\0'; | |
388 | ||
389 | if (data[cnt] == '\0') | |
390 | /* Unexpected end of data */ | |
391 | return -1; | |
392 | ||
393 | tok[i] = data + cnt; | |
394 | ||
395 | while (data[cnt] && !isspace(data[cnt])) | |
396 | ++cnt; | |
e05b6f98 | 397 | } |
10289b0f RK |
398 | while (isspace(data[cnt])) |
399 | data[cnt++] = '\0'; | |
f7112e6c | 400 | |
10289b0f RK |
401 | while (i < 4) |
402 | tok[i++] = NULL; | |
403 | ||
404 | if (smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0)) | |
405 | return -1; | |
406 | ||
407 | return cnt; | |
828716c2 JS |
408 | } |
409 | ||
f7112e6c CS |
410 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
411 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
e05b6f98 | 412 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
828716c2 | 413 | /** |
f7112e6c | 414 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
415 | * @file: file pointer, not actually used |
416 | * @buf: where to get the data from | |
417 | * @count: bytes sent | |
418 | * @ppos: where to start - must be 0 | |
419 | * @rule_list: the list of rules to write to | |
420 | * @rule_lock: lock for the rule list | |
e05b6f98 | 421 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 JS |
422 | * |
423 | * Get one smack access rule from above. | |
f7112e6c CS |
424 | * The format for SMK_LONG_FMT is: |
425 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
426 | * The format for SMK_FIXED24_FMT is exactly: | |
427 | * "subject object rwxat" | |
e05b6f98 RK |
428 | * The format for SMK_CHANGE_FMT is: |
429 | * "subject<whitespace>object<whitespace> | |
430 | * acc_enable<whitespace>acc_disable[<whitespace>...]" | |
828716c2 | 431 | */ |
f7112e6c CS |
432 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
433 | size_t count, loff_t *ppos, | |
434 | struct list_head *rule_list, | |
435 | struct mutex *rule_lock, int format) | |
828716c2 | 436 | { |
470043ba | 437 | struct smack_parsed_rule rule; |
828716c2 | 438 | char *data; |
10289b0f RK |
439 | int rc; |
440 | int trunc = 0; | |
441 | int tokens; | |
442 | ssize_t cnt = 0; | |
828716c2 JS |
443 | |
444 | /* | |
445 | * No partial writes. | |
446 | * Enough data must be present. | |
447 | */ | |
448 | if (*ppos != 0) | |
449 | return -EINVAL; | |
828716c2 | 450 | |
f7112e6c CS |
451 | if (format == SMK_FIXED24_FMT) { |
452 | /* | |
453 | * Minor hack for backward compatibility | |
454 | */ | |
455 | if (count != SMK_OLOADLEN && count != SMK_LOADLEN) | |
456 | return -EINVAL; | |
10289b0f RK |
457 | } else { |
458 | if (count >= PAGE_SIZE) { | |
459 | count = PAGE_SIZE - 1; | |
460 | trunc = 1; | |
461 | } | |
462 | } | |
f7112e6c | 463 | |
10289b0f | 464 | data = kmalloc(count + 1, GFP_KERNEL); |
828716c2 JS |
465 | if (data == NULL) |
466 | return -ENOMEM; | |
467 | ||
468 | if (copy_from_user(data, buf, count) != 0) { | |
469 | rc = -EFAULT; | |
470 | goto out; | |
471 | } | |
472 | ||
10289b0f RK |
473 | /* |
474 | * In case of parsing only part of user buf, | |
475 | * avoid having partial rule at the data buffer | |
476 | */ | |
477 | if (trunc) { | |
478 | while (count > 0 && (data[count - 1] != '\n')) | |
479 | --count; | |
480 | if (count == 0) { | |
481 | rc = -EINVAL; | |
470043ba | 482 | goto out; |
10289b0f | 483 | } |
f7112e6c CS |
484 | } |
485 | ||
10289b0f RK |
486 | data[count] = '\0'; |
487 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); | |
488 | while (cnt < count) { | |
489 | if (format == SMK_FIXED24_FMT) { | |
490 | rc = smk_parse_rule(data, &rule, 1); | |
491 | if (rc != 0) { | |
492 | rc = -EINVAL; | |
493 | goto out; | |
494 | } | |
495 | cnt = count; | |
496 | } else { | |
497 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); | |
498 | if (rc <= 0) { | |
499 | rc = -EINVAL; | |
500 | goto out; | |
501 | } | |
502 | cnt += rc; | |
503 | } | |
504 | ||
505 | if (rule_list == NULL) | |
506 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, | |
507 | &rule.smk_subject->smk_rules_lock, 1); | |
508 | else | |
509 | rc = smk_set_access(&rule, rule_list, rule_lock, 0); | |
510 | ||
511 | if (rc) | |
512 | goto out; | |
272cd7a8 CS |
513 | } |
514 | ||
10289b0f | 515 | rc = cnt; |
e114e473 CS |
516 | out: |
517 | kfree(data); | |
518 | return rc; | |
519 | } | |
520 | ||
7898e1f8 | 521 | /* |
40809565 | 522 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
523 | */ |
524 | ||
40809565 CS |
525 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
526 | struct list_head *head) | |
7898e1f8 | 527 | { |
272cd7a8 CS |
528 | struct list_head *list; |
529 | ||
530 | /* | |
531 | * This is 0 the first time through. | |
532 | */ | |
533 | if (s->index == 0) | |
40809565 | 534 | s->private = head; |
272cd7a8 CS |
535 | |
536 | if (s->private == NULL) | |
7898e1f8 | 537 | return NULL; |
272cd7a8 CS |
538 | |
539 | list = s->private; | |
540 | if (list_empty(list)) | |
7898e1f8 | 541 | return NULL; |
272cd7a8 CS |
542 | |
543 | if (s->index == 0) | |
544 | return list->next; | |
545 | return list; | |
7898e1f8 CS |
546 | } |
547 | ||
40809565 CS |
548 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
549 | struct list_head *head) | |
7898e1f8 CS |
550 | { |
551 | struct list_head *list = v; | |
552 | ||
40809565 | 553 | if (list_is_last(list, head)) { |
272cd7a8 | 554 | s->private = NULL; |
7898e1f8 CS |
555 | return NULL; |
556 | } | |
272cd7a8 | 557 | s->private = list->next; |
7898e1f8 CS |
558 | return list->next; |
559 | } | |
560 | ||
40809565 CS |
561 | static void smk_seq_stop(struct seq_file *s, void *v) |
562 | { | |
563 | /* No-op */ | |
564 | } | |
565 | ||
f7112e6c | 566 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 567 | { |
f7112e6c CS |
568 | /* |
569 | * Don't show any rules with label names too long for | |
570 | * interface file (/smack/load or /smack/load2) | |
571 | * because you should expect to be able to write | |
572 | * anything you read back. | |
573 | */ | |
2f823ff8 CS |
574 | if (strlen(srp->smk_subject->smk_known) >= max || |
575 | strlen(srp->smk_object) >= max) | |
f7112e6c | 576 | return; |
7898e1f8 | 577 | |
65ee7f45 RK |
578 | if (srp->smk_access == 0) |
579 | return; | |
580 | ||
2f823ff8 | 581 | seq_printf(s, "%s %s", srp->smk_subject->smk_known, srp->smk_object); |
7898e1f8 CS |
582 | |
583 | seq_putc(s, ' '); | |
584 | ||
585 | if (srp->smk_access & MAY_READ) | |
586 | seq_putc(s, 'r'); | |
587 | if (srp->smk_access & MAY_WRITE) | |
588 | seq_putc(s, 'w'); | |
589 | if (srp->smk_access & MAY_EXEC) | |
590 | seq_putc(s, 'x'); | |
591 | if (srp->smk_access & MAY_APPEND) | |
592 | seq_putc(s, 'a'); | |
593 | if (srp->smk_access & MAY_TRANSMUTE) | |
594 | seq_putc(s, 't'); | |
7898e1f8 CS |
595 | |
596 | seq_putc(s, '\n'); | |
f7112e6c CS |
597 | } |
598 | ||
599 | /* | |
600 | * Seq_file read operations for /smack/load | |
601 | */ | |
602 | ||
603 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
604 | { | |
605 | return smk_seq_start(s, pos, &smack_rule_list); | |
606 | } | |
607 | ||
608 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
609 | { | |
610 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
611 | } | |
612 | ||
613 | static int load_seq_show(struct seq_file *s, void *v) | |
614 | { | |
615 | struct list_head *list = v; | |
616 | struct smack_master_list *smlp = | |
617 | list_entry(list, struct smack_master_list, list); | |
618 | ||
619 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
620 | |
621 | return 0; | |
622 | } | |
623 | ||
7898e1f8 | 624 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
625 | .start = load2_seq_start, |
626 | .next = load2_seq_next, | |
7898e1f8 | 627 | .show = load_seq_show, |
40809565 | 628 | .stop = smk_seq_stop, |
7898e1f8 CS |
629 | }; |
630 | ||
631 | /** | |
632 | * smk_open_load - open() for /smack/load | |
633 | * @inode: inode structure representing file | |
634 | * @file: "load" file pointer | |
635 | * | |
636 | * For reading, use load_seq_* seq_file reading operations. | |
637 | */ | |
638 | static int smk_open_load(struct inode *inode, struct file *file) | |
639 | { | |
640 | return seq_open(file, &load_seq_ops); | |
641 | } | |
642 | ||
643 | /** | |
644 | * smk_write_load - write() for /smack/load | |
645 | * @file: file pointer, not actually used | |
646 | * @buf: where to get the data from | |
647 | * @count: bytes sent | |
648 | * @ppos: where to start - must be 0 | |
649 | * | |
650 | */ | |
651 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
652 | size_t count, loff_t *ppos) | |
653 | { | |
7898e1f8 CS |
654 | /* |
655 | * Must have privilege. | |
656 | * No partial writes. | |
657 | * Enough data must be present. | |
658 | */ | |
1880eff7 | 659 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
660 | return -EPERM; |
661 | ||
f7112e6c CS |
662 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
663 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
664 | } |
665 | ||
e114e473 CS |
666 | static const struct file_operations smk_load_ops = { |
667 | .open = smk_open_load, | |
668 | .read = seq_read, | |
669 | .llseek = seq_lseek, | |
670 | .write = smk_write_load, | |
cb622bbb | 671 | .release = seq_release, |
e114e473 CS |
672 | }; |
673 | ||
674 | /** | |
675 | * smk_cipso_doi - initialize the CIPSO domain | |
676 | */ | |
30aa4faf | 677 | static void smk_cipso_doi(void) |
e114e473 CS |
678 | { |
679 | int rc; | |
680 | struct cipso_v4_doi *doip; | |
6d3dc07c | 681 | struct netlbl_audit nai; |
e114e473 | 682 | |
6d3dc07c | 683 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 684 | |
6d3dc07c | 685 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
686 | if (rc != 0) |
687 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
688 | __func__, __LINE__, rc); | |
689 | ||
690 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
691 | if (doip == NULL) | |
692 | panic("smack: Failed to initialize cipso DOI.\n"); | |
693 | doip->map.std = NULL; | |
694 | doip->doi = smk_cipso_doi_value; | |
695 | doip->type = CIPSO_V4_MAP_PASS; | |
696 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
697 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
698 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
699 | ||
6d3dc07c | 700 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 701 | if (rc != 0) { |
6c2e8ac0 PM |
702 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
703 | __func__, __LINE__, rc); | |
704 | kfree(doip); | |
705 | return; | |
706 | } | |
6d3dc07c | 707 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
708 | if (rc != 0) { |
709 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 710 | __func__, __LINE__, rc); |
b1edeb10 | 711 | kfree(doip); |
6c2e8ac0 | 712 | return; |
b1edeb10 | 713 | } |
e114e473 CS |
714 | } |
715 | ||
4bc87e62 CS |
716 | /** |
717 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 718 | * @oldambient: previous domain string |
4bc87e62 | 719 | */ |
30aa4faf | 720 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
721 | { |
722 | int rc; | |
6d3dc07c | 723 | struct netlbl_audit nai; |
4bc87e62 | 724 | |
6d3dc07c | 725 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
726 | |
727 | if (oldambient != NULL) { | |
6d3dc07c | 728 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
729 | if (rc != 0) |
730 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
731 | __func__, __LINE__, rc); | |
732 | } | |
f7112e6c | 733 | if (smack_net_ambient == NULL) |
2f823ff8 | 734 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 735 | |
2f823ff8 | 736 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 737 | NULL, NULL, &nai); |
4bc87e62 CS |
738 | if (rc != 0) |
739 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
740 | __func__, __LINE__, rc); | |
741 | } | |
742 | ||
e114e473 CS |
743 | /* |
744 | * Seq_file read operations for /smack/cipso | |
745 | */ | |
746 | ||
747 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
748 | { | |
40809565 | 749 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
750 | } |
751 | ||
752 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
753 | { | |
40809565 | 754 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
755 | } |
756 | ||
757 | /* | |
758 | * Print cipso labels in format: | |
759 | * label level[/cat[,cat]] | |
760 | */ | |
761 | static int cipso_seq_show(struct seq_file *s, void *v) | |
762 | { | |
7198e2ee EB |
763 | struct list_head *list = v; |
764 | struct smack_known *skp = | |
765 | list_entry(list, struct smack_known, list); | |
f7112e6c | 766 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 767 | char sep = '/'; |
e114e473 | 768 | int i; |
e114e473 | 769 | |
f7112e6c CS |
770 | /* |
771 | * Don't show a label that could not have been set using | |
772 | * /smack/cipso. This is in support of the notion that | |
773 | * anything read from /smack/cipso ought to be writeable | |
774 | * to /smack/cipso. | |
775 | * | |
776 | * /smack/cipso2 should be used instead. | |
777 | */ | |
778 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
779 | return 0; |
780 | ||
f7112e6c | 781 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 782 | |
f7112e6c CS |
783 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; |
784 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
785 | seq_printf(s, "%c%d", sep, i); | |
786 | sep = ','; | |
787 | } | |
e114e473 CS |
788 | |
789 | seq_putc(s, '\n'); | |
790 | ||
791 | return 0; | |
792 | } | |
793 | ||
88e9d34c | 794 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 795 | .start = cipso_seq_start, |
e114e473 CS |
796 | .next = cipso_seq_next, |
797 | .show = cipso_seq_show, | |
40809565 | 798 | .stop = smk_seq_stop, |
e114e473 CS |
799 | }; |
800 | ||
801 | /** | |
802 | * smk_open_cipso - open() for /smack/cipso | |
803 | * @inode: inode structure representing file | |
804 | * @file: "cipso" file pointer | |
805 | * | |
806 | * Connect our cipso_seq_* operations with /smack/cipso | |
807 | * file_operations | |
808 | */ | |
809 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
810 | { | |
811 | return seq_open(file, &cipso_seq_ops); | |
812 | } | |
813 | ||
814 | /** | |
f7112e6c | 815 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 816 | * @file: file pointer, not actually used |
e114e473 CS |
817 | * @buf: where to get the data from |
818 | * @count: bytes sent | |
819 | * @ppos: where to start | |
f7112e6c | 820 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
821 | * |
822 | * Accepts only one cipso rule per write call. | |
823 | * Returns number of bytes written or error code, as appropriate | |
824 | */ | |
f7112e6c CS |
825 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
826 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
827 | { |
828 | struct smack_known *skp; | |
f7112e6c CS |
829 | struct netlbl_lsm_secattr ncats; |
830 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 831 | int maplevel; |
f7112e6c | 832 | unsigned int cat; |
e114e473 CS |
833 | int catlen; |
834 | ssize_t rc = -EINVAL; | |
835 | char *data = NULL; | |
836 | char *rule; | |
837 | int ret; | |
838 | int i; | |
839 | ||
840 | /* | |
841 | * Must have privilege. | |
842 | * No partial writes. | |
843 | * Enough data must be present. | |
844 | */ | |
1880eff7 | 845 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
846 | return -EPERM; |
847 | if (*ppos != 0) | |
848 | return -EINVAL; | |
f7112e6c CS |
849 | if (format == SMK_FIXED24_FMT && |
850 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
851 | return -EINVAL; |
852 | ||
853 | data = kzalloc(count + 1, GFP_KERNEL); | |
854 | if (data == NULL) | |
855 | return -ENOMEM; | |
856 | ||
857 | if (copy_from_user(data, buf, count) != 0) { | |
858 | rc = -EFAULT; | |
859 | goto unlockedout; | |
860 | } | |
861 | ||
862 | data[count] = '\0'; | |
863 | rule = data; | |
864 | /* | |
865 | * Only allow one writer at a time. Writes should be | |
866 | * quite rare and small in any case. | |
867 | */ | |
868 | mutex_lock(&smack_cipso_lock); | |
869 | ||
870 | skp = smk_import_entry(rule, 0); | |
871 | if (skp == NULL) | |
872 | goto out; | |
873 | ||
f7112e6c CS |
874 | if (format == SMK_FIXED24_FMT) |
875 | rule += SMK_LABELLEN; | |
876 | else | |
0fcfee61 | 877 | rule += strlen(skp->smk_known) + 1; |
f7112e6c | 878 | |
e114e473 CS |
879 | ret = sscanf(rule, "%d", &maplevel); |
880 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
881 | goto out; | |
882 | ||
883 | rule += SMK_DIGITLEN; | |
884 | ret = sscanf(rule, "%d", &catlen); | |
885 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
886 | goto out; | |
887 | ||
f7112e6c CS |
888 | if (format == SMK_FIXED24_FMT && |
889 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
890 | goto out; |
891 | ||
892 | memset(mapcatset, 0, sizeof(mapcatset)); | |
893 | ||
894 | for (i = 0; i < catlen; i++) { | |
895 | rule += SMK_DIGITLEN; | |
f7112e6c | 896 | ret = sscanf(rule, "%u", &cat); |
677264e8 | 897 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
898 | goto out; |
899 | ||
900 | smack_catset_bit(cat, mapcatset); | |
901 | } | |
902 | ||
f7112e6c CS |
903 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
904 | if (rc >= 0) { | |
905 | netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat); | |
906 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; | |
907 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
908 | rc = count; | |
e114e473 CS |
909 | } |
910 | ||
e114e473 CS |
911 | out: |
912 | mutex_unlock(&smack_cipso_lock); | |
913 | unlockedout: | |
914 | kfree(data); | |
915 | return rc; | |
916 | } | |
917 | ||
f7112e6c CS |
918 | /** |
919 | * smk_write_cipso - write() for /smack/cipso | |
920 | * @file: file pointer, not actually used | |
921 | * @buf: where to get the data from | |
922 | * @count: bytes sent | |
923 | * @ppos: where to start | |
924 | * | |
925 | * Accepts only one cipso rule per write call. | |
926 | * Returns number of bytes written or error code, as appropriate | |
927 | */ | |
928 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
929 | size_t count, loff_t *ppos) | |
930 | { | |
931 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
932 | } | |
933 | ||
e114e473 CS |
934 | static const struct file_operations smk_cipso_ops = { |
935 | .open = smk_open_cipso, | |
936 | .read = seq_read, | |
937 | .llseek = seq_lseek, | |
938 | .write = smk_write_cipso, | |
939 | .release = seq_release, | |
940 | }; | |
941 | ||
f7112e6c CS |
942 | /* |
943 | * Seq_file read operations for /smack/cipso2 | |
944 | */ | |
945 | ||
946 | /* | |
947 | * Print cipso labels in format: | |
948 | * label level[/cat[,cat]] | |
949 | */ | |
950 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
951 | { | |
952 | struct list_head *list = v; | |
953 | struct smack_known *skp = | |
954 | list_entry(list, struct smack_known, list); | |
955 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; | |
956 | char sep = '/'; | |
957 | int i; | |
958 | ||
959 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
960 | ||
961 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; | |
962 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
963 | seq_printf(s, "%c%d", sep, i); | |
964 | sep = ','; | |
965 | } | |
966 | ||
967 | seq_putc(s, '\n'); | |
968 | ||
969 | return 0; | |
970 | } | |
971 | ||
972 | static const struct seq_operations cipso2_seq_ops = { | |
973 | .start = cipso_seq_start, | |
974 | .next = cipso_seq_next, | |
975 | .show = cipso2_seq_show, | |
976 | .stop = smk_seq_stop, | |
977 | }; | |
978 | ||
979 | /** | |
980 | * smk_open_cipso2 - open() for /smack/cipso2 | |
981 | * @inode: inode structure representing file | |
982 | * @file: "cipso2" file pointer | |
983 | * | |
984 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
985 | * file_operations | |
986 | */ | |
987 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
988 | { | |
989 | return seq_open(file, &cipso2_seq_ops); | |
990 | } | |
991 | ||
992 | /** | |
993 | * smk_write_cipso2 - write() for /smack/cipso2 | |
994 | * @file: file pointer, not actually used | |
995 | * @buf: where to get the data from | |
996 | * @count: bytes sent | |
997 | * @ppos: where to start | |
998 | * | |
999 | * Accepts only one cipso rule per write call. | |
1000 | * Returns number of bytes written or error code, as appropriate | |
1001 | */ | |
1002 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1003 | size_t count, loff_t *ppos) | |
1004 | { | |
1005 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1006 | } | |
1007 | ||
1008 | static const struct file_operations smk_cipso2_ops = { | |
1009 | .open = smk_open_cipso2, | |
1010 | .read = seq_read, | |
1011 | .llseek = seq_lseek, | |
1012 | .write = smk_write_cipso2, | |
1013 | .release = seq_release, | |
1014 | }; | |
1015 | ||
6d3dc07c CS |
1016 | /* |
1017 | * Seq_file read operations for /smack/netlabel | |
1018 | */ | |
1019 | ||
1020 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
1021 | { | |
40809565 | 1022 | return smk_seq_start(s, pos, &smk_netlbladdr_list); |
6d3dc07c CS |
1023 | } |
1024 | ||
1025 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1026 | { | |
40809565 | 1027 | return smk_seq_next(s, v, pos, &smk_netlbladdr_list); |
6d3dc07c | 1028 | } |
6d3dc07c CS |
1029 | #define BEBITS (sizeof(__be32) * 8) |
1030 | ||
1031 | /* | |
1032 | * Print host/label pairs | |
1033 | */ | |
1034 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
1035 | { | |
7198e2ee EB |
1036 | struct list_head *list = v; |
1037 | struct smk_netlbladdr *skp = | |
1038 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 1039 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 1040 | int maskn; |
1041 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 1042 | |
113a0e45 | 1043 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
1044 | |
1045 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
1046 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
1047 | ||
1048 | return 0; | |
1049 | } | |
1050 | ||
88e9d34c | 1051 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c | 1052 | .start = netlbladdr_seq_start, |
6d3dc07c CS |
1053 | .next = netlbladdr_seq_next, |
1054 | .show = netlbladdr_seq_show, | |
40809565 | 1055 | .stop = smk_seq_stop, |
6d3dc07c CS |
1056 | }; |
1057 | ||
1058 | /** | |
1059 | * smk_open_netlbladdr - open() for /smack/netlabel | |
1060 | * @inode: inode structure representing file | |
1061 | * @file: "netlabel" file pointer | |
1062 | * | |
1063 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
1064 | * file_operations | |
1065 | */ | |
1066 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
1067 | { | |
1068 | return seq_open(file, &netlbladdr_seq_ops); | |
1069 | } | |
1070 | ||
113a0e45 | 1071 | /** |
1072 | * smk_netlbladdr_insert | |
1073 | * @new : netlabel to insert | |
1074 | * | |
1075 | * This helper insert netlabel in the smack_netlbladdrs list | |
1076 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
1077 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
1078 | * | |
113a0e45 | 1079 | */ |
1080 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
1081 | { | |
7198e2ee | 1082 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 1083 | |
7198e2ee EB |
1084 | if (list_empty(&smk_netlbladdr_list)) { |
1085 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1086 | return; |
1087 | } | |
1088 | ||
05725f7e JP |
1089 | m = list_entry_rcu(smk_netlbladdr_list.next, |
1090 | struct smk_netlbladdr, list); | |
7198e2ee | 1091 | |
113a0e45 | 1092 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
1093 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
1094 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1095 | return; |
1096 | } | |
7198e2ee EB |
1097 | |
1098 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
1099 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
1100 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1101 | return; |
1102 | } | |
05725f7e JP |
1103 | m_next = list_entry_rcu(m->list.next, |
1104 | struct smk_netlbladdr, list); | |
7198e2ee EB |
1105 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
1106 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1107 | return; |
1108 | } | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | ||
6d3dc07c CS |
1113 | /** |
1114 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 1115 | * @file: file pointer, not actually used |
6d3dc07c CS |
1116 | * @buf: where to get the data from |
1117 | * @count: bytes sent | |
1118 | * @ppos: where to start | |
1119 | * | |
1120 | * Accepts only one netlbladdr per write call. | |
1121 | * Returns number of bytes written or error code, as appropriate | |
1122 | */ | |
1123 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
1124 | size_t count, loff_t *ppos) | |
1125 | { | |
1126 | struct smk_netlbladdr *skp; | |
1127 | struct sockaddr_in newname; | |
f7112e6c | 1128 | char *smack; |
6d3dc07c | 1129 | char *sp; |
f7112e6c | 1130 | char *data; |
6d3dc07c CS |
1131 | char *host = (char *)&newname.sin_addr.s_addr; |
1132 | int rc; | |
1133 | struct netlbl_audit audit_info; | |
1134 | struct in_addr mask; | |
1135 | unsigned int m; | |
7198e2ee | 1136 | int found; |
113a0e45 | 1137 | u32 mask_bits = (1<<31); |
6d3dc07c | 1138 | __be32 nsa; |
113a0e45 | 1139 | u32 temp_mask; |
6d3dc07c CS |
1140 | |
1141 | /* | |
1142 | * Must have privilege. | |
1143 | * No partial writes. | |
1144 | * Enough data must be present. | |
1145 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1146 | * "<addr, as a.b.c.d><space><label>" | |
1147 | */ | |
1880eff7 | 1148 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1149 | return -EPERM; |
1150 | if (*ppos != 0) | |
1151 | return -EINVAL; | |
f7112e6c | 1152 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1153 | return -EINVAL; |
f7112e6c CS |
1154 | |
1155 | data = kzalloc(count + 1, GFP_KERNEL); | |
1156 | if (data == NULL) | |
1157 | return -ENOMEM; | |
1158 | ||
1159 | if (copy_from_user(data, buf, count) != 0) { | |
1160 | rc = -EFAULT; | |
1161 | goto free_data_out; | |
1162 | } | |
1163 | ||
1164 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1165 | if (smack == NULL) { | |
1166 | rc = -ENOMEM; | |
1167 | goto free_data_out; | |
1168 | } | |
6d3dc07c CS |
1169 | |
1170 | data[count] = '\0'; | |
1171 | ||
1172 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
1173 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
1174 | if (rc != 6) { | |
1175 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1176 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1177 | if (rc != 5) { |
1178 | rc = -EINVAL; | |
1179 | goto free_out; | |
1180 | } | |
6d3dc07c CS |
1181 | m = BEBITS; |
1182 | } | |
f7112e6c CS |
1183 | if (m > BEBITS) { |
1184 | rc = -EINVAL; | |
1185 | goto free_out; | |
1186 | } | |
6d3dc07c | 1187 | |
f7112e6c CS |
1188 | /* |
1189 | * If smack begins with '-', it is an option, don't import it | |
1190 | */ | |
4303154e EB |
1191 | if (smack[0] != '-') { |
1192 | sp = smk_import(smack, 0); | |
f7112e6c CS |
1193 | if (sp == NULL) { |
1194 | rc = -EINVAL; | |
1195 | goto free_out; | |
1196 | } | |
4303154e EB |
1197 | } else { |
1198 | /* check known options */ | |
1199 | if (strcmp(smack, smack_cipso_option) == 0) | |
1200 | sp = (char *)smack_cipso_option; | |
f7112e6c CS |
1201 | else { |
1202 | rc = -EINVAL; | |
1203 | goto free_out; | |
1204 | } | |
4303154e | 1205 | } |
6d3dc07c | 1206 | |
113a0e45 | 1207 | for (temp_mask = 0; m > 0; m--) { |
1208 | temp_mask |= mask_bits; | |
1209 | mask_bits >>= 1; | |
6d3dc07c | 1210 | } |
113a0e45 | 1211 | mask.s_addr = cpu_to_be32(temp_mask); |
1212 | ||
1213 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1214 | /* |
1215 | * Only allow one writer at a time. Writes should be | |
1216 | * quite rare and small in any case. | |
1217 | */ | |
1218 | mutex_lock(&smk_netlbladdr_lock); | |
1219 | ||
1220 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1221 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
1222 | found = 0; |
1223 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 1224 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
1225 | skp->smk_mask.s_addr == mask.s_addr) { |
1226 | found = 1; | |
6d3dc07c | 1227 | break; |
7198e2ee EB |
1228 | } |
1229 | } | |
6d3dc07c CS |
1230 | smk_netlabel_audit_set(&audit_info); |
1231 | ||
7198e2ee | 1232 | if (found == 0) { |
6d3dc07c CS |
1233 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
1234 | if (skp == NULL) | |
1235 | rc = -ENOMEM; | |
1236 | else { | |
1237 | rc = 0; | |
1238 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
1239 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 1240 | skp->smk_label = sp; |
113a0e45 | 1241 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
1242 | } |
1243 | } else { | |
4303154e | 1244 | /* we delete the unlabeled entry, only if the previous label |
25985edc | 1245 | * wasn't the special CIPSO option */ |
4303154e EB |
1246 | if (skp->smk_label != smack_cipso_option) |
1247 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
1248 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
1249 | PF_INET, &audit_info); | |
1250 | else | |
1251 | rc = 0; | |
6d3dc07c CS |
1252 | skp->smk_label = sp; |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Now tell netlabel about the single label nature of | |
1257 | * this host so that incoming packets get labeled. | |
4303154e | 1258 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1259 | */ |
4303154e | 1260 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
1261 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
1262 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
1263 | smack_to_secid(skp->smk_label), &audit_info); | |
1264 | ||
1265 | if (rc == 0) | |
1266 | rc = count; | |
1267 | ||
1268 | mutex_unlock(&smk_netlbladdr_lock); | |
1269 | ||
f7112e6c CS |
1270 | free_out: |
1271 | kfree(smack); | |
1272 | free_data_out: | |
1273 | kfree(data); | |
1274 | ||
6d3dc07c CS |
1275 | return rc; |
1276 | } | |
1277 | ||
1278 | static const struct file_operations smk_netlbladdr_ops = { | |
1279 | .open = smk_open_netlbladdr, | |
1280 | .read = seq_read, | |
1281 | .llseek = seq_lseek, | |
1282 | .write = smk_write_netlbladdr, | |
1283 | .release = seq_release, | |
1284 | }; | |
1285 | ||
e114e473 CS |
1286 | /** |
1287 | * smk_read_doi - read() for /smack/doi | |
1288 | * @filp: file pointer, not actually used | |
1289 | * @buf: where to put the result | |
1290 | * @count: maximum to send along | |
1291 | * @ppos: where to start | |
1292 | * | |
1293 | * Returns number of bytes read or error code, as appropriate | |
1294 | */ | |
1295 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1296 | size_t count, loff_t *ppos) | |
1297 | { | |
1298 | char temp[80]; | |
1299 | ssize_t rc; | |
1300 | ||
1301 | if (*ppos != 0) | |
1302 | return 0; | |
1303 | ||
1304 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1305 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1306 | ||
1307 | return rc; | |
1308 | } | |
1309 | ||
1310 | /** | |
1311 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1312 | * @file: file pointer, not actually used |
e114e473 CS |
1313 | * @buf: where to get the data from |
1314 | * @count: bytes sent | |
1315 | * @ppos: where to start | |
1316 | * | |
1317 | * Returns number of bytes written or error code, as appropriate | |
1318 | */ | |
1319 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1320 | size_t count, loff_t *ppos) | |
1321 | { | |
1322 | char temp[80]; | |
1323 | int i; | |
1324 | ||
1880eff7 | 1325 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1326 | return -EPERM; |
1327 | ||
1328 | if (count >= sizeof(temp) || count == 0) | |
1329 | return -EINVAL; | |
1330 | ||
1331 | if (copy_from_user(temp, buf, count) != 0) | |
1332 | return -EFAULT; | |
1333 | ||
1334 | temp[count] = '\0'; | |
1335 | ||
1336 | if (sscanf(temp, "%d", &i) != 1) | |
1337 | return -EINVAL; | |
1338 | ||
1339 | smk_cipso_doi_value = i; | |
1340 | ||
1341 | smk_cipso_doi(); | |
1342 | ||
1343 | return count; | |
1344 | } | |
1345 | ||
1346 | static const struct file_operations smk_doi_ops = { | |
1347 | .read = smk_read_doi, | |
1348 | .write = smk_write_doi, | |
6038f373 | 1349 | .llseek = default_llseek, |
e114e473 CS |
1350 | }; |
1351 | ||
1352 | /** | |
1353 | * smk_read_direct - read() for /smack/direct | |
1354 | * @filp: file pointer, not actually used | |
1355 | * @buf: where to put the result | |
1356 | * @count: maximum to send along | |
1357 | * @ppos: where to start | |
1358 | * | |
1359 | * Returns number of bytes read or error code, as appropriate | |
1360 | */ | |
1361 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1362 | size_t count, loff_t *ppos) | |
1363 | { | |
1364 | char temp[80]; | |
1365 | ssize_t rc; | |
1366 | ||
1367 | if (*ppos != 0) | |
1368 | return 0; | |
1369 | ||
1370 | sprintf(temp, "%d", smack_cipso_direct); | |
1371 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1372 | ||
1373 | return rc; | |
1374 | } | |
1375 | ||
1376 | /** | |
1377 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1378 | * @file: file pointer, not actually used |
e114e473 CS |
1379 | * @buf: where to get the data from |
1380 | * @count: bytes sent | |
1381 | * @ppos: where to start | |
1382 | * | |
1383 | * Returns number of bytes written or error code, as appropriate | |
1384 | */ | |
1385 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1386 | size_t count, loff_t *ppos) | |
1387 | { | |
f7112e6c | 1388 | struct smack_known *skp; |
e114e473 CS |
1389 | char temp[80]; |
1390 | int i; | |
1391 | ||
1880eff7 | 1392 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1393 | return -EPERM; |
1394 | ||
1395 | if (count >= sizeof(temp) || count == 0) | |
1396 | return -EINVAL; | |
1397 | ||
1398 | if (copy_from_user(temp, buf, count) != 0) | |
1399 | return -EFAULT; | |
1400 | ||
1401 | temp[count] = '\0'; | |
1402 | ||
1403 | if (sscanf(temp, "%d", &i) != 1) | |
1404 | return -EINVAL; | |
1405 | ||
f7112e6c CS |
1406 | /* |
1407 | * Don't do anything if the value hasn't actually changed. | |
1408 | * If it is changing reset the level on entries that were | |
1409 | * set up to be direct when they were created. | |
1410 | */ | |
1411 | if (smack_cipso_direct != i) { | |
1412 | mutex_lock(&smack_known_lock); | |
1413 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1414 | if (skp->smk_netlabel.attr.mls.lvl == | |
1415 | smack_cipso_direct) | |
1416 | skp->smk_netlabel.attr.mls.lvl = i; | |
1417 | smack_cipso_direct = i; | |
1418 | mutex_unlock(&smack_known_lock); | |
1419 | } | |
e114e473 CS |
1420 | |
1421 | return count; | |
1422 | } | |
1423 | ||
1424 | static const struct file_operations smk_direct_ops = { | |
1425 | .read = smk_read_direct, | |
1426 | .write = smk_write_direct, | |
6038f373 | 1427 | .llseek = default_llseek, |
e114e473 CS |
1428 | }; |
1429 | ||
f7112e6c CS |
1430 | /** |
1431 | * smk_read_mapped - read() for /smack/mapped | |
1432 | * @filp: file pointer, not actually used | |
1433 | * @buf: where to put the result | |
1434 | * @count: maximum to send along | |
1435 | * @ppos: where to start | |
1436 | * | |
1437 | * Returns number of bytes read or error code, as appropriate | |
1438 | */ | |
1439 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1440 | size_t count, loff_t *ppos) | |
1441 | { | |
1442 | char temp[80]; | |
1443 | ssize_t rc; | |
1444 | ||
1445 | if (*ppos != 0) | |
1446 | return 0; | |
1447 | ||
1448 | sprintf(temp, "%d", smack_cipso_mapped); | |
1449 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1450 | ||
1451 | return rc; | |
1452 | } | |
1453 | ||
1454 | /** | |
1455 | * smk_write_mapped - write() for /smack/mapped | |
1456 | * @file: file pointer, not actually used | |
1457 | * @buf: where to get the data from | |
1458 | * @count: bytes sent | |
1459 | * @ppos: where to start | |
1460 | * | |
1461 | * Returns number of bytes written or error code, as appropriate | |
1462 | */ | |
1463 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1464 | size_t count, loff_t *ppos) | |
1465 | { | |
1466 | struct smack_known *skp; | |
1467 | char temp[80]; | |
1468 | int i; | |
1469 | ||
1880eff7 | 1470 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1471 | return -EPERM; |
1472 | ||
1473 | if (count >= sizeof(temp) || count == 0) | |
1474 | return -EINVAL; | |
1475 | ||
1476 | if (copy_from_user(temp, buf, count) != 0) | |
1477 | return -EFAULT; | |
1478 | ||
1479 | temp[count] = '\0'; | |
1480 | ||
1481 | if (sscanf(temp, "%d", &i) != 1) | |
1482 | return -EINVAL; | |
1483 | ||
1484 | /* | |
1485 | * Don't do anything if the value hasn't actually changed. | |
1486 | * If it is changing reset the level on entries that were | |
1487 | * set up to be mapped when they were created. | |
1488 | */ | |
1489 | if (smack_cipso_mapped != i) { | |
1490 | mutex_lock(&smack_known_lock); | |
1491 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1492 | if (skp->smk_netlabel.attr.mls.lvl == | |
1493 | smack_cipso_mapped) | |
1494 | skp->smk_netlabel.attr.mls.lvl = i; | |
1495 | smack_cipso_mapped = i; | |
1496 | mutex_unlock(&smack_known_lock); | |
1497 | } | |
1498 | ||
1499 | return count; | |
1500 | } | |
1501 | ||
1502 | static const struct file_operations smk_mapped_ops = { | |
1503 | .read = smk_read_mapped, | |
1504 | .write = smk_write_mapped, | |
1505 | .llseek = default_llseek, | |
1506 | }; | |
1507 | ||
e114e473 CS |
1508 | /** |
1509 | * smk_read_ambient - read() for /smack/ambient | |
1510 | * @filp: file pointer, not actually used | |
1511 | * @buf: where to put the result | |
1512 | * @cn: maximum to send along | |
1513 | * @ppos: where to start | |
1514 | * | |
1515 | * Returns number of bytes read or error code, as appropriate | |
1516 | */ | |
1517 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1518 | size_t cn, loff_t *ppos) | |
1519 | { | |
1520 | ssize_t rc; | |
e114e473 CS |
1521 | int asize; |
1522 | ||
1523 | if (*ppos != 0) | |
1524 | return 0; | |
1525 | /* | |
1526 | * Being careful to avoid a problem in the case where | |
1527 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1528 | */ |
4bc87e62 | 1529 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1530 | |
2f823ff8 | 1531 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1532 | |
1533 | if (cn >= asize) | |
1534 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1535 | smack_net_ambient->smk_known, |
1536 | asize); | |
4bc87e62 CS |
1537 | else |
1538 | rc = -EINVAL; | |
e114e473 | 1539 | |
4bc87e62 | 1540 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1541 | |
1542 | return rc; | |
1543 | } | |
1544 | ||
1545 | /** | |
1546 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1547 | * @file: file pointer, not actually used |
e114e473 CS |
1548 | * @buf: where to get the data from |
1549 | * @count: bytes sent | |
1550 | * @ppos: where to start | |
1551 | * | |
1552 | * Returns number of bytes written or error code, as appropriate | |
1553 | */ | |
1554 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1555 | size_t count, loff_t *ppos) | |
1556 | { | |
2f823ff8 | 1557 | struct smack_known *skp; |
4bc87e62 | 1558 | char *oldambient; |
f7112e6c CS |
1559 | char *data; |
1560 | int rc = count; | |
e114e473 | 1561 | |
1880eff7 | 1562 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1563 | return -EPERM; |
1564 | ||
f7112e6c CS |
1565 | data = kzalloc(count + 1, GFP_KERNEL); |
1566 | if (data == NULL) | |
1567 | return -ENOMEM; | |
e114e473 | 1568 | |
f7112e6c CS |
1569 | if (copy_from_user(data, buf, count) != 0) { |
1570 | rc = -EFAULT; | |
1571 | goto out; | |
1572 | } | |
e114e473 | 1573 | |
2f823ff8 CS |
1574 | skp = smk_import_entry(data, count); |
1575 | if (skp == NULL) { | |
f7112e6c CS |
1576 | rc = -EINVAL; |
1577 | goto out; | |
1578 | } | |
e114e473 | 1579 | |
4bc87e62 CS |
1580 | mutex_lock(&smack_ambient_lock); |
1581 | ||
2f823ff8 CS |
1582 | oldambient = smack_net_ambient->smk_known; |
1583 | smack_net_ambient = skp; | |
4bc87e62 CS |
1584 | smk_unlbl_ambient(oldambient); |
1585 | ||
1586 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1587 | |
f7112e6c CS |
1588 | out: |
1589 | kfree(data); | |
1590 | return rc; | |
e114e473 CS |
1591 | } |
1592 | ||
1593 | static const struct file_operations smk_ambient_ops = { | |
1594 | .read = smk_read_ambient, | |
1595 | .write = smk_write_ambient, | |
6038f373 | 1596 | .llseek = default_llseek, |
e114e473 CS |
1597 | }; |
1598 | ||
15446235 CS |
1599 | /** |
1600 | * smk_read_onlycap - read() for /smack/onlycap | |
1601 | * @filp: file pointer, not actually used | |
1602 | * @buf: where to put the result | |
1603 | * @cn: maximum to send along | |
1604 | * @ppos: where to start | |
1605 | * | |
1606 | * Returns number of bytes read or error code, as appropriate | |
1607 | */ | |
1608 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1609 | size_t cn, loff_t *ppos) | |
1610 | { | |
1611 | char *smack = ""; | |
1612 | ssize_t rc = -EINVAL; | |
1613 | int asize; | |
1614 | ||
1615 | if (*ppos != 0) | |
1616 | return 0; | |
1617 | ||
1618 | if (smack_onlycap != NULL) | |
1619 | smack = smack_onlycap; | |
1620 | ||
1621 | asize = strlen(smack) + 1; | |
1622 | ||
1623 | if (cn >= asize) | |
1624 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1625 | ||
1626 | return rc; | |
1627 | } | |
1628 | ||
1629 | /** | |
1630 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1631 | * @file: file pointer, not actually used |
15446235 CS |
1632 | * @buf: where to get the data from |
1633 | * @count: bytes sent | |
1634 | * @ppos: where to start | |
1635 | * | |
1636 | * Returns number of bytes written or error code, as appropriate | |
1637 | */ | |
1638 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1639 | size_t count, loff_t *ppos) | |
1640 | { | |
f7112e6c | 1641 | char *data; |
2f823ff8 | 1642 | struct smack_known *skp = smk_of_task(current->cred->security); |
f7112e6c | 1643 | int rc = count; |
15446235 | 1644 | |
1880eff7 | 1645 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
1646 | return -EPERM; |
1647 | ||
1648 | /* | |
1649 | * This can be done using smk_access() but is done | |
1650 | * explicitly for clarity. The smk_access() implementation | |
1651 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1652 | */ | |
2f823ff8 | 1653 | if (smack_onlycap != NULL && smack_onlycap != skp->smk_known) |
15446235 CS |
1654 | return -EPERM; |
1655 | ||
f7112e6c CS |
1656 | data = kzalloc(count, GFP_KERNEL); |
1657 | if (data == NULL) | |
1658 | return -ENOMEM; | |
15446235 CS |
1659 | |
1660 | /* | |
1661 | * Should the null string be passed in unset the onlycap value. | |
1662 | * This seems like something to be careful with as usually | |
1663 | * smk_import only expects to return NULL for errors. It | |
1664 | * is usually the case that a nullstring or "\n" would be | |
1665 | * bad to pass to smk_import but in fact this is useful here. | |
f7112e6c CS |
1666 | * |
1667 | * smk_import will also reject a label beginning with '-', | |
1668 | * so "-usecapabilities" will also work. | |
15446235 | 1669 | */ |
f7112e6c CS |
1670 | if (copy_from_user(data, buf, count) != 0) |
1671 | rc = -EFAULT; | |
1672 | else | |
1673 | smack_onlycap = smk_import(data, count); | |
15446235 | 1674 | |
f7112e6c CS |
1675 | kfree(data); |
1676 | return rc; | |
15446235 CS |
1677 | } |
1678 | ||
1679 | static const struct file_operations smk_onlycap_ops = { | |
1680 | .read = smk_read_onlycap, | |
1681 | .write = smk_write_onlycap, | |
6038f373 | 1682 | .llseek = default_llseek, |
15446235 CS |
1683 | }; |
1684 | ||
ecfcc53f EB |
1685 | /** |
1686 | * smk_read_logging - read() for /smack/logging | |
1687 | * @filp: file pointer, not actually used | |
1688 | * @buf: where to put the result | |
1689 | * @cn: maximum to send along | |
1690 | * @ppos: where to start | |
1691 | * | |
1692 | * Returns number of bytes read or error code, as appropriate | |
1693 | */ | |
1694 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1695 | size_t count, loff_t *ppos) | |
1696 | { | |
1697 | char temp[32]; | |
1698 | ssize_t rc; | |
1699 | ||
1700 | if (*ppos != 0) | |
1701 | return 0; | |
1702 | ||
1703 | sprintf(temp, "%d\n", log_policy); | |
1704 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1705 | return rc; | |
1706 | } | |
1707 | ||
1708 | /** | |
1709 | * smk_write_logging - write() for /smack/logging | |
1710 | * @file: file pointer, not actually used | |
1711 | * @buf: where to get the data from | |
1712 | * @count: bytes sent | |
1713 | * @ppos: where to start | |
1714 | * | |
1715 | * Returns number of bytes written or error code, as appropriate | |
1716 | */ | |
1717 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1718 | size_t count, loff_t *ppos) | |
1719 | { | |
1720 | char temp[32]; | |
1721 | int i; | |
1722 | ||
1880eff7 | 1723 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
1724 | return -EPERM; |
1725 | ||
1726 | if (count >= sizeof(temp) || count == 0) | |
1727 | return -EINVAL; | |
1728 | ||
1729 | if (copy_from_user(temp, buf, count) != 0) | |
1730 | return -EFAULT; | |
1731 | ||
1732 | temp[count] = '\0'; | |
1733 | ||
1734 | if (sscanf(temp, "%d", &i) != 1) | |
1735 | return -EINVAL; | |
1736 | if (i < 0 || i > 3) | |
1737 | return -EINVAL; | |
1738 | log_policy = i; | |
1739 | return count; | |
1740 | } | |
1741 | ||
1742 | ||
1743 | ||
1744 | static const struct file_operations smk_logging_ops = { | |
1745 | .read = smk_read_logging, | |
1746 | .write = smk_write_logging, | |
6038f373 | 1747 | .llseek = default_llseek, |
ecfcc53f | 1748 | }; |
7898e1f8 CS |
1749 | |
1750 | /* | |
1751 | * Seq_file read operations for /smack/load-self | |
1752 | */ | |
1753 | ||
1754 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
1755 | { | |
1756 | struct task_smack *tsp = current_security(); | |
1757 | ||
40809565 | 1758 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
1759 | } |
1760 | ||
1761 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1762 | { | |
1763 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 1764 | |
40809565 | 1765 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
1766 | } |
1767 | ||
1768 | static int load_self_seq_show(struct seq_file *s, void *v) | |
1769 | { | |
1770 | struct list_head *list = v; | |
1771 | struct smack_rule *srp = | |
1772 | list_entry(list, struct smack_rule, list); | |
1773 | ||
f7112e6c | 1774 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
1775 | |
1776 | return 0; | |
1777 | } | |
1778 | ||
7898e1f8 CS |
1779 | static const struct seq_operations load_self_seq_ops = { |
1780 | .start = load_self_seq_start, | |
1781 | .next = load_self_seq_next, | |
1782 | .show = load_self_seq_show, | |
40809565 | 1783 | .stop = smk_seq_stop, |
7898e1f8 CS |
1784 | }; |
1785 | ||
1786 | ||
1787 | /** | |
f7112e6c | 1788 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
1789 | * @inode: inode structure representing file |
1790 | * @file: "load" file pointer | |
1791 | * | |
1792 | * For reading, use load_seq_* seq_file reading operations. | |
1793 | */ | |
1794 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
1795 | { | |
1796 | return seq_open(file, &load_self_seq_ops); | |
1797 | } | |
1798 | ||
1799 | /** | |
1800 | * smk_write_load_self - write() for /smack/load-self | |
1801 | * @file: file pointer, not actually used | |
1802 | * @buf: where to get the data from | |
1803 | * @count: bytes sent | |
1804 | * @ppos: where to start - must be 0 | |
1805 | * | |
1806 | */ | |
1807 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
1808 | size_t count, loff_t *ppos) | |
1809 | { | |
1810 | struct task_smack *tsp = current_security(); | |
1811 | ||
f7112e6c CS |
1812 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
1813 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
1814 | } |
1815 | ||
1816 | static const struct file_operations smk_load_self_ops = { | |
1817 | .open = smk_open_load_self, | |
1818 | .read = seq_read, | |
1819 | .llseek = seq_lseek, | |
1820 | .write = smk_write_load_self, | |
1821 | .release = seq_release, | |
1822 | }; | |
828716c2 JS |
1823 | |
1824 | /** | |
f7112e6c | 1825 | * smk_user_access - handle access check transaction |
828716c2 JS |
1826 | * @file: file pointer |
1827 | * @buf: data from user space | |
1828 | * @count: bytes sent | |
1829 | * @ppos: where to start - must be 0 | |
1830 | */ | |
f7112e6c CS |
1831 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
1832 | size_t count, loff_t *ppos, int format) | |
828716c2 | 1833 | { |
e05b6f98 | 1834 | struct smack_parsed_rule rule; |
828716c2 | 1835 | char *data; |
f8859d98 | 1836 | int res; |
828716c2 | 1837 | |
828716c2 JS |
1838 | data = simple_transaction_get(file, buf, count); |
1839 | if (IS_ERR(data)) | |
1840 | return PTR_ERR(data); | |
1841 | ||
f7112e6c CS |
1842 | if (format == SMK_FIXED24_FMT) { |
1843 | if (count < SMK_LOADLEN) | |
1844 | return -EINVAL; | |
1845 | res = smk_parse_rule(data, &rule, 0); | |
1846 | } else { | |
1847 | /* | |
10289b0f | 1848 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 1849 | */ |
10289b0f | 1850 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
1851 | } |
1852 | ||
10289b0f | 1853 | if (res < 0) |
828716c2 JS |
1854 | return -EINVAL; |
1855 | ||
2f823ff8 CS |
1856 | res = smk_access(rule.smk_subject, rule.smk_object, |
1857 | rule.smk_access1, NULL); | |
f8859d98 JS |
1858 | data[0] = res == 0 ? '1' : '0'; |
1859 | data[1] = '\0'; | |
828716c2 | 1860 | |
d86b2b61 | 1861 | simple_transaction_set(file, 2); |
f7112e6c CS |
1862 | |
1863 | if (format == SMK_FIXED24_FMT) | |
1864 | return SMK_LOADLEN; | |
1865 | return count; | |
1866 | } | |
1867 | ||
1868 | /** | |
1869 | * smk_write_access - handle access check transaction | |
1870 | * @file: file pointer | |
1871 | * @buf: data from user space | |
1872 | * @count: bytes sent | |
1873 | * @ppos: where to start - must be 0 | |
1874 | */ | |
1875 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
1876 | size_t count, loff_t *ppos) | |
1877 | { | |
1878 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
1879 | } |
1880 | ||
1881 | static const struct file_operations smk_access_ops = { | |
1882 | .write = smk_write_access, | |
1883 | .read = simple_transaction_read, | |
1884 | .release = simple_transaction_release, | |
1885 | .llseek = generic_file_llseek, | |
1886 | }; | |
1887 | ||
f7112e6c CS |
1888 | |
1889 | /* | |
1890 | * Seq_file read operations for /smack/load2 | |
1891 | */ | |
1892 | ||
1893 | static int load2_seq_show(struct seq_file *s, void *v) | |
1894 | { | |
1895 | struct list_head *list = v; | |
1896 | struct smack_master_list *smlp = | |
1897 | list_entry(list, struct smack_master_list, list); | |
1898 | ||
1899 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
1900 | ||
1901 | return 0; | |
1902 | } | |
1903 | ||
1904 | static const struct seq_operations load2_seq_ops = { | |
1905 | .start = load2_seq_start, | |
1906 | .next = load2_seq_next, | |
1907 | .show = load2_seq_show, | |
1908 | .stop = smk_seq_stop, | |
1909 | }; | |
1910 | ||
1911 | /** | |
1912 | * smk_open_load2 - open() for /smack/load2 | |
1913 | * @inode: inode structure representing file | |
1914 | * @file: "load2" file pointer | |
1915 | * | |
1916 | * For reading, use load2_seq_* seq_file reading operations. | |
1917 | */ | |
1918 | static int smk_open_load2(struct inode *inode, struct file *file) | |
1919 | { | |
1920 | return seq_open(file, &load2_seq_ops); | |
1921 | } | |
1922 | ||
1923 | /** | |
1924 | * smk_write_load2 - write() for /smack/load2 | |
1925 | * @file: file pointer, not actually used | |
1926 | * @buf: where to get the data from | |
1927 | * @count: bytes sent | |
1928 | * @ppos: where to start - must be 0 | |
1929 | * | |
1930 | */ | |
1931 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
1932 | size_t count, loff_t *ppos) | |
1933 | { | |
1934 | /* | |
1935 | * Must have privilege. | |
1936 | */ | |
1880eff7 | 1937 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1938 | return -EPERM; |
1939 | ||
1940 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
1941 | SMK_LONG_FMT); | |
1942 | } | |
1943 | ||
1944 | static const struct file_operations smk_load2_ops = { | |
1945 | .open = smk_open_load2, | |
1946 | .read = seq_read, | |
1947 | .llseek = seq_lseek, | |
1948 | .write = smk_write_load2, | |
1949 | .release = seq_release, | |
1950 | }; | |
1951 | ||
1952 | /* | |
1953 | * Seq_file read operations for /smack/load-self2 | |
1954 | */ | |
1955 | ||
1956 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
1957 | { | |
1958 | struct task_smack *tsp = current_security(); | |
1959 | ||
1960 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
1961 | } | |
1962 | ||
1963 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1964 | { | |
1965 | struct task_smack *tsp = current_security(); | |
1966 | ||
1967 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
1968 | } | |
1969 | ||
1970 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
1971 | { | |
1972 | struct list_head *list = v; | |
1973 | struct smack_rule *srp = | |
1974 | list_entry(list, struct smack_rule, list); | |
1975 | ||
1976 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
1977 | ||
1978 | return 0; | |
1979 | } | |
1980 | ||
1981 | static const struct seq_operations load_self2_seq_ops = { | |
1982 | .start = load_self2_seq_start, | |
1983 | .next = load_self2_seq_next, | |
1984 | .show = load_self2_seq_show, | |
1985 | .stop = smk_seq_stop, | |
1986 | }; | |
1987 | ||
1988 | /** | |
1989 | * smk_open_load_self2 - open() for /smack/load-self2 | |
1990 | * @inode: inode structure representing file | |
1991 | * @file: "load" file pointer | |
1992 | * | |
1993 | * For reading, use load_seq_* seq_file reading operations. | |
1994 | */ | |
1995 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
1996 | { | |
1997 | return seq_open(file, &load_self2_seq_ops); | |
1998 | } | |
1999 | ||
2000 | /** | |
2001 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2002 | * @file: file pointer, not actually used | |
2003 | * @buf: where to get the data from | |
2004 | * @count: bytes sent | |
2005 | * @ppos: where to start - must be 0 | |
2006 | * | |
2007 | */ | |
2008 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2009 | size_t count, loff_t *ppos) | |
2010 | { | |
2011 | struct task_smack *tsp = current_security(); | |
2012 | ||
2013 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2014 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2015 | } | |
2016 | ||
2017 | static const struct file_operations smk_load_self2_ops = { | |
2018 | .open = smk_open_load_self2, | |
2019 | .read = seq_read, | |
2020 | .llseek = seq_lseek, | |
2021 | .write = smk_write_load_self2, | |
2022 | .release = seq_release, | |
2023 | }; | |
2024 | ||
2025 | /** | |
2026 | * smk_write_access2 - handle access check transaction | |
2027 | * @file: file pointer | |
2028 | * @buf: data from user space | |
2029 | * @count: bytes sent | |
2030 | * @ppos: where to start - must be 0 | |
2031 | */ | |
2032 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2033 | size_t count, loff_t *ppos) | |
2034 | { | |
2035 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2036 | } | |
2037 | ||
2038 | static const struct file_operations smk_access2_ops = { | |
2039 | .write = smk_write_access2, | |
2040 | .read = simple_transaction_read, | |
2041 | .release = simple_transaction_release, | |
2042 | .llseek = generic_file_llseek, | |
2043 | }; | |
2044 | ||
449543b0 RK |
2045 | /** |
2046 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2047 | * @file: file pointer | |
2048 | * @buf: data from user space | |
2049 | * @count: bytes sent | |
2050 | * @ppos: where to start - must be 0 | |
2051 | */ | |
2052 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2053 | size_t count, loff_t *ppos) | |
2054 | { | |
2055 | char *data = NULL; | |
2056 | const char *cp = NULL; | |
2057 | struct smack_known *skp; | |
2058 | struct smack_rule *sp; | |
2059 | struct list_head *rule_list; | |
2060 | struct mutex *rule_lock; | |
2061 | int rc = count; | |
2062 | ||
2063 | if (*ppos != 0) | |
2064 | return -EINVAL; | |
2065 | ||
2066 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2067 | return -EPERM; | |
2068 | ||
2069 | if (count == 0 || count > SMK_LONGLABEL) | |
2070 | return -EINVAL; | |
2071 | ||
2072 | data = kzalloc(count, GFP_KERNEL); | |
2073 | if (data == NULL) | |
2074 | return -ENOMEM; | |
2075 | ||
2076 | if (copy_from_user(data, buf, count) != 0) { | |
2077 | rc = -EFAULT; | |
2078 | goto free_out; | |
2079 | } | |
2080 | ||
2081 | cp = smk_parse_smack(data, count); | |
2082 | if (cp == NULL) { | |
2083 | rc = -EINVAL; | |
2084 | goto free_out; | |
2085 | } | |
2086 | ||
2087 | skp = smk_find_entry(cp); | |
d15d9fad | 2088 | if (skp == NULL) |
449543b0 | 2089 | goto free_out; |
449543b0 RK |
2090 | |
2091 | rule_list = &skp->smk_rules; | |
2092 | rule_lock = &skp->smk_rules_lock; | |
2093 | ||
2094 | mutex_lock(rule_lock); | |
2095 | ||
2096 | list_for_each_entry_rcu(sp, rule_list, list) | |
2097 | sp->smk_access = 0; | |
2098 | ||
2099 | mutex_unlock(rule_lock); | |
2100 | ||
2101 | free_out: | |
2102 | kfree(data); | |
2103 | kfree(cp); | |
2104 | return rc; | |
2105 | } | |
2106 | ||
2107 | static const struct file_operations smk_revoke_subj_ops = { | |
2108 | .write = smk_write_revoke_subj, | |
2109 | .read = simple_transaction_read, | |
2110 | .release = simple_transaction_release, | |
2111 | .llseek = generic_file_llseek, | |
2112 | }; | |
2113 | ||
e9307237 CS |
2114 | static struct kset *smackfs_kset; |
2115 | /** | |
2116 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2117 | * | |
2118 | */ | |
2119 | static int smk_init_sysfs(void) | |
2120 | { | |
2121 | smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj); | |
2122 | if (!smackfs_kset) | |
2123 | return -ENOMEM; | |
2124 | return 0; | |
2125 | } | |
2126 | ||
e05b6f98 RK |
2127 | /** |
2128 | * smk_write_change_rule - write() for /smack/change-rule | |
2129 | * @file: file pointer | |
2130 | * @buf: data from user space | |
2131 | * @count: bytes sent | |
2132 | * @ppos: where to start - must be 0 | |
2133 | */ | |
2134 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2135 | size_t count, loff_t *ppos) | |
2136 | { | |
2137 | /* | |
2138 | * Must have privilege. | |
2139 | */ | |
2140 | if (!capable(CAP_MAC_ADMIN)) | |
2141 | return -EPERM; | |
2142 | ||
2143 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2144 | SMK_CHANGE_FMT); | |
2145 | } | |
2146 | ||
2147 | static const struct file_operations smk_change_rule_ops = { | |
2148 | .write = smk_write_change_rule, | |
2149 | .read = simple_transaction_read, | |
2150 | .release = simple_transaction_release, | |
2151 | .llseek = generic_file_llseek, | |
2152 | }; | |
2153 | ||
e114e473 CS |
2154 | /** |
2155 | * smk_fill_super - fill the /smackfs superblock | |
2156 | * @sb: the empty superblock | |
2157 | * @data: unused | |
2158 | * @silent: unused | |
2159 | * | |
2160 | * Fill in the well known entries for /smack | |
2161 | * | |
2162 | * Returns 0 on success, an error code on failure | |
2163 | */ | |
2164 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2165 | { | |
2166 | int rc; | |
2167 | struct inode *root_inode; | |
2168 | ||
2169 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
2170 | [SMK_LOAD] = { |
2171 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2172 | [SMK_CIPSO] = { | |
2173 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2174 | [SMK_DOI] = { | |
2175 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2176 | [SMK_DIRECT] = { | |
2177 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2178 | [SMK_AMBIENT] = { | |
2179 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
2180 | [SMK_NETLBLADDR] = { | |
2181 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
2182 | [SMK_ONLYCAP] = { | |
2183 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2184 | [SMK_LOGGING] = { | |
2185 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2186 | [SMK_LOAD_SELF] = { | |
2187 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2188 | [SMK_ACCESSES] = { |
0e94ae17 | 2189 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2190 | [SMK_MAPPED] = { |
2191 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2192 | [SMK_LOAD2] = { | |
2193 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2194 | [SMK_LOAD_SELF2] = { | |
2195 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2196 | [SMK_ACCESS2] = { | |
2197 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2198 | [SMK_CIPSO2] = { | |
2199 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2200 | [SMK_REVOKE_SUBJ] = { |
2201 | "revoke-subject", &smk_revoke_subj_ops, | |
2202 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2203 | [SMK_CHANGE_RULE] = { |
2204 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2205 | /* last one */ |
2206 | {""} | |
e114e473 CS |
2207 | }; |
2208 | ||
2209 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2210 | if (rc != 0) { | |
2211 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2212 | __func__, rc); | |
2213 | return rc; | |
2214 | } | |
2215 | ||
2216 | root_inode = sb->s_root->d_inode; | |
e114e473 CS |
2217 | |
2218 | return 0; | |
2219 | } | |
2220 | ||
2221 | /** | |
fc14f2fe | 2222 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2223 | * @fs_type: passed along without comment |
2224 | * @flags: passed along without comment | |
2225 | * @dev_name: passed along without comment | |
2226 | * @data: passed along without comment | |
e114e473 CS |
2227 | * |
2228 | * Just passes everything along. | |
2229 | * | |
2230 | * Returns what the lower level code does. | |
2231 | */ | |
fc14f2fe AV |
2232 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2233 | int flags, const char *dev_name, void *data) | |
e114e473 | 2234 | { |
fc14f2fe | 2235 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2236 | } |
2237 | ||
2238 | static struct file_system_type smk_fs_type = { | |
2239 | .name = "smackfs", | |
fc14f2fe | 2240 | .mount = smk_mount, |
e114e473 CS |
2241 | .kill_sb = kill_litter_super, |
2242 | }; | |
2243 | ||
2244 | static struct vfsmount *smackfs_mount; | |
2245 | ||
f7112e6c CS |
2246 | static int __init smk_preset_netlabel(struct smack_known *skp) |
2247 | { | |
2248 | skp->smk_netlabel.domain = skp->smk_known; | |
2249 | skp->smk_netlabel.flags = | |
2250 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
2251 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
2252 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
2253 | } | |
2254 | ||
e114e473 CS |
2255 | /** |
2256 | * init_smk_fs - get the smackfs superblock | |
2257 | * | |
2258 | * register the smackfs | |
2259 | * | |
076c54c5 AD |
2260 | * Do not register smackfs if Smack wasn't enabled |
2261 | * on boot. We can not put this method normally under the | |
2262 | * smack_init() code path since the security subsystem get | |
2263 | * initialized before the vfs caches. | |
2264 | * | |
2265 | * Returns true if we were not chosen on boot or if | |
2266 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2267 | */ |
2268 | static int __init init_smk_fs(void) | |
2269 | { | |
2270 | int err; | |
f7112e6c | 2271 | int rc; |
e114e473 | 2272 | |
076c54c5 AD |
2273 | if (!security_module_enable(&smack_ops)) |
2274 | return 0; | |
2275 | ||
e9307237 CS |
2276 | err = smk_init_sysfs(); |
2277 | if (err) | |
2278 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
2279 | ||
e114e473 CS |
2280 | err = register_filesystem(&smk_fs_type); |
2281 | if (!err) { | |
2282 | smackfs_mount = kern_mount(&smk_fs_type); | |
2283 | if (IS_ERR(smackfs_mount)) { | |
2284 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
2285 | err = PTR_ERR(smackfs_mount); | |
2286 | smackfs_mount = NULL; | |
2287 | } | |
2288 | } | |
2289 | ||
e114e473 | 2290 | smk_cipso_doi(); |
4bc87e62 | 2291 | smk_unlbl_ambient(NULL); |
e114e473 | 2292 | |
f7112e6c CS |
2293 | rc = smk_preset_netlabel(&smack_known_floor); |
2294 | if (err == 0 && rc < 0) | |
2295 | err = rc; | |
2296 | rc = smk_preset_netlabel(&smack_known_hat); | |
2297 | if (err == 0 && rc < 0) | |
2298 | err = rc; | |
2299 | rc = smk_preset_netlabel(&smack_known_huh); | |
2300 | if (err == 0 && rc < 0) | |
2301 | err = rc; | |
2302 | rc = smk_preset_netlabel(&smack_known_invalid); | |
2303 | if (err == 0 && rc < 0) | |
2304 | err = rc; | |
2305 | rc = smk_preset_netlabel(&smack_known_star); | |
2306 | if (err == 0 && rc < 0) | |
2307 | err = rc; | |
2308 | rc = smk_preset_netlabel(&smack_known_web); | |
2309 | if (err == 0 && rc < 0) | |
2310 | err = rc; | |
2311 | ||
e114e473 CS |
2312 | return err; |
2313 | } | |
2314 | ||
2315 | __initcall(init_smk_fs); |