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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) */ |
00f84f3f | 55 | SMK_SYSLOG = 20, /* change syslog label) */ |
66867818 | 56 | SMK_PTRACE = 21, /* set ptrace rule */ |
e114e473 CS |
57 | }; |
58 | ||
59 | /* | |
60 | * List locks | |
61 | */ | |
e114e473 | 62 | static DEFINE_MUTEX(smack_cipso_lock); |
4bc87e62 | 63 | static DEFINE_MUTEX(smack_ambient_lock); |
00f84f3f | 64 | static DEFINE_MUTEX(smack_syslog_lock); |
6d3dc07c | 65 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
66 | |
67 | /* | |
68 | * This is the "ambient" label for network traffic. | |
69 | * If it isn't somehow marked, use this. | |
70 | * It can be reset via smackfs/ambient | |
71 | */ | |
2f823ff8 | 72 | struct smack_known *smack_net_ambient; |
e114e473 | 73 | |
e114e473 CS |
74 | /* |
75 | * This is the level in a CIPSO header that indicates a | |
76 | * smack label is contained directly in the category set. | |
77 | * It can be reset via smackfs/direct | |
78 | */ | |
79 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
80 | ||
f7112e6c CS |
81 | /* |
82 | * This is the level in a CIPSO header that indicates a | |
83 | * secid is contained directly in the category set. | |
84 | * It can be reset via smackfs/mapped | |
85 | */ | |
86 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; | |
87 | ||
15446235 CS |
88 | /* |
89 | * Unless a process is running with this label even | |
90 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
91 | * privilege to violate MAC policy. If no label is | |
92 | * designated (the NULL case) capabilities apply to | |
93 | * everyone. It is expected that the hat (^) label | |
94 | * will be used if any label is used. | |
95 | */ | |
00f84f3f CS |
96 | struct smack_known *smack_onlycap; |
97 | ||
98 | /* | |
99 | * If this value is set restrict syslog use to the label specified. | |
100 | * It can be reset via smackfs/syslog | |
101 | */ | |
102 | struct smack_known *smack_syslog_label; | |
15446235 | 103 | |
66867818 LP |
104 | /* |
105 | * Ptrace current rule | |
106 | * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) | |
107 | * SMACK_PTRACE_EXACT labels must match, but can be overriden with | |
108 | * CAP_SYS_PTRACE | |
109 | * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect | |
110 | */ | |
111 | int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; | |
112 | ||
6d3dc07c CS |
113 | /* |
114 | * Certain IP addresses may be designated as single label hosts. | |
115 | * Packets are sent there unlabeled, but only from tasks that | |
116 | * can write to the specified label. | |
117 | */ | |
7198e2ee EB |
118 | |
119 | LIST_HEAD(smk_netlbladdr_list); | |
272cd7a8 CS |
120 | |
121 | /* | |
122 | * Rule lists are maintained for each label. | |
f7112e6c | 123 | * This master list is just for reading /smack/load and /smack/load2. |
272cd7a8 CS |
124 | */ |
125 | struct smack_master_list { | |
126 | struct list_head list; | |
127 | struct smack_rule *smk_rule; | |
128 | }; | |
129 | ||
7198e2ee | 130 | LIST_HEAD(smack_rule_list); |
6d3dc07c | 131 | |
e05b6f98 | 132 | struct smack_parsed_rule { |
2f823ff8 | 133 | struct smack_known *smk_subject; |
21c7eae2 | 134 | struct smack_known *smk_object; |
e05b6f98 RK |
135 | int smk_access1; |
136 | int smk_access2; | |
137 | }; | |
138 | ||
e114e473 | 139 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 140 | |
21c7eae2 LP |
141 | struct smack_known smack_cipso_option = { |
142 | .smk_known = SMACK_CIPSO_OPTION, | |
143 | .smk_secid = 0, | |
144 | }; | |
4303154e | 145 | |
e114e473 CS |
146 | /* |
147 | * Values for parsing cipso rules | |
148 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
149 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
150 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
151 | */ |
152 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
153 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
154 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
155 | ||
156 | /* | |
157 | * Values for parsing MAC rules | |
158 | * SMK_ACCESS: Maximum possible combination of access permissions | |
159 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
160 | * SMK_LOADLEN: Smack rule length | |
161 | */ | |
5c6d1125 | 162 | #define SMK_OACCESS "rwxa" |
c0ab6e56 | 163 | #define SMK_ACCESS "rwxatl" |
5c6d1125 JS |
164 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
165 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
166 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
167 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 168 | |
f7112e6c CS |
169 | /* |
170 | * Stricly for CIPSO level manipulation. | |
171 | * Set the category bit number in a smack label sized buffer. | |
172 | */ | |
173 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) | |
174 | { | |
175 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) | |
176 | return; | |
177 | ||
178 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
179 | } | |
180 | ||
6d3dc07c CS |
181 | /** |
182 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
183 | * @nap: structure to fill | |
184 | */ | |
185 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
186 | { | |
2f823ff8 CS |
187 | struct smack_known *skp = smk_of_current(); |
188 | ||
6d3dc07c CS |
189 | nap->loginuid = audit_get_loginuid(current); |
190 | nap->sessionid = audit_get_sessionid(current); | |
2f823ff8 | 191 | nap->secid = skp->smk_secid; |
6d3dc07c CS |
192 | } |
193 | ||
194 | /* | |
f7112e6c | 195 | * Value for parsing single label host rules |
6d3dc07c | 196 | * "1.2.3.4 X" |
6d3dc07c CS |
197 | */ |
198 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 199 | |
e114e473 | 200 | /** |
e05b6f98 RK |
201 | * smk_set_access - add a rule to the rule list or replace an old rule |
202 | * @srp: the rule to add or replace | |
7898e1f8 CS |
203 | * @rule_list: the list of rules |
204 | * @rule_lock: the rule list lock | |
e05b6f98 | 205 | * @global: if non-zero, indicates a global rule |
e114e473 CS |
206 | * |
207 | * Looks through the current subject/object/access list for | |
208 | * the subject/object pair and replaces the access that was | |
209 | * there. If the pair isn't found add it with the specified | |
210 | * access. | |
81ea714b SL |
211 | * |
212 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
213 | * during the allocation of the new pair to add. | |
e114e473 | 214 | */ |
e05b6f98 RK |
215 | static int smk_set_access(struct smack_parsed_rule *srp, |
216 | struct list_head *rule_list, | |
217 | struct mutex *rule_lock, int global) | |
e114e473 | 218 | { |
7198e2ee | 219 | struct smack_rule *sp; |
e05b6f98 | 220 | struct smack_master_list *smlp; |
7898e1f8 | 221 | int found = 0; |
e05b6f98 | 222 | int rc = 0; |
e114e473 | 223 | |
7898e1f8 CS |
224 | mutex_lock(rule_lock); |
225 | ||
272cd7a8 CS |
226 | /* |
227 | * Because the object label is less likely to match | |
228 | * than the subject label check it first | |
229 | */ | |
7898e1f8 | 230 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
231 | if (sp->smk_object == srp->smk_object && |
232 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee | 233 | found = 1; |
e05b6f98 RK |
234 | sp->smk_access |= srp->smk_access1; |
235 | sp->smk_access &= ~srp->smk_access2; | |
e114e473 CS |
236 | break; |
237 | } | |
e114e473 CS |
238 | } |
239 | ||
e05b6f98 RK |
240 | if (found == 0) { |
241 | sp = kzalloc(sizeof(*sp), GFP_KERNEL); | |
242 | if (sp == NULL) { | |
243 | rc = -ENOMEM; | |
244 | goto out; | |
245 | } | |
246 | ||
247 | sp->smk_subject = srp->smk_subject; | |
248 | sp->smk_object = srp->smk_object; | |
249 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; | |
250 | ||
251 | list_add_rcu(&sp->list, rule_list); | |
252 | /* | |
253 | * If this is a global as opposed to self and a new rule | |
254 | * it needs to get added for reporting. | |
255 | */ | |
256 | if (global) { | |
257 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
258 | if (smlp != NULL) { | |
259 | smlp->smk_rule = sp; | |
260 | list_add_rcu(&smlp->list, &smack_rule_list); | |
261 | } else | |
262 | rc = -ENOMEM; | |
263 | } | |
264 | } | |
265 | ||
266 | out: | |
7898e1f8 | 267 | mutex_unlock(rule_lock); |
e05b6f98 RK |
268 | return rc; |
269 | } | |
270 | ||
271 | /** | |
272 | * smk_perm_from_str - parse smack accesses from a text string | |
273 | * @string: a text string that contains a Smack accesses code | |
274 | * | |
275 | * Returns an integer with respective bits set for specified accesses. | |
276 | */ | |
277 | static int smk_perm_from_str(const char *string) | |
278 | { | |
279 | int perm = 0; | |
280 | const char *cp; | |
e114e473 | 281 | |
e05b6f98 RK |
282 | for (cp = string; ; cp++) |
283 | switch (*cp) { | |
284 | case '-': | |
285 | break; | |
286 | case 'r': | |
287 | case 'R': | |
288 | perm |= MAY_READ; | |
289 | break; | |
290 | case 'w': | |
291 | case 'W': | |
292 | perm |= MAY_WRITE; | |
293 | break; | |
294 | case 'x': | |
295 | case 'X': | |
296 | perm |= MAY_EXEC; | |
297 | break; | |
298 | case 'a': | |
299 | case 'A': | |
300 | perm |= MAY_APPEND; | |
301 | break; | |
302 | case 't': | |
303 | case 'T': | |
304 | perm |= MAY_TRANSMUTE; | |
305 | break; | |
c0ab6e56 CS |
306 | case 'l': |
307 | case 'L': | |
308 | perm |= MAY_LOCK; | |
309 | break; | |
d166c802 CS |
310 | case 'b': |
311 | case 'B': | |
312 | perm |= MAY_BRINGUP; | |
313 | break; | |
e05b6f98 RK |
314 | default: |
315 | return perm; | |
316 | } | |
e114e473 CS |
317 | } |
318 | ||
319 | /** | |
f7112e6c CS |
320 | * smk_fill_rule - Fill Smack rule from strings |
321 | * @subject: subject label string | |
322 | * @object: object label string | |
e05b6f98 RK |
323 | * @access1: access string |
324 | * @access2: string with permissions to be removed | |
0e94ae17 JS |
325 | * @rule: Smack rule |
326 | * @import: if non-zero, import labels | |
3518721a | 327 | * @len: label length limit |
f7112e6c | 328 | * |
398ce073 JS |
329 | * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject |
330 | * or object is missing. | |
e114e473 | 331 | */ |
f7112e6c | 332 | static int smk_fill_rule(const char *subject, const char *object, |
e05b6f98 RK |
333 | const char *access1, const char *access2, |
334 | struct smack_parsed_rule *rule, int import, | |
335 | int len) | |
e114e473 | 336 | { |
f7112e6c | 337 | const char *cp; |
0e94ae17 | 338 | struct smack_known *skp; |
e114e473 | 339 | |
0e94ae17 | 340 | if (import) { |
2f823ff8 | 341 | rule->smk_subject = smk_import_entry(subject, len); |
0e94ae17 | 342 | if (rule->smk_subject == NULL) |
398ce073 | 343 | return -EINVAL; |
0e94ae17 | 344 | |
21c7eae2 | 345 | rule->smk_object = smk_import_entry(object, len); |
0e94ae17 | 346 | if (rule->smk_object == NULL) |
398ce073 | 347 | return -EINVAL; |
0e94ae17 | 348 | } else { |
3518721a | 349 | cp = smk_parse_smack(subject, len); |
f7112e6c | 350 | if (cp == NULL) |
398ce073 | 351 | return -EINVAL; |
f7112e6c CS |
352 | skp = smk_find_entry(cp); |
353 | kfree(cp); | |
0e94ae17 | 354 | if (skp == NULL) |
398ce073 | 355 | return -ENOENT; |
2f823ff8 | 356 | rule->smk_subject = skp; |
0e94ae17 | 357 | |
3518721a | 358 | cp = smk_parse_smack(object, len); |
f7112e6c | 359 | if (cp == NULL) |
398ce073 | 360 | return -EINVAL; |
f7112e6c CS |
361 | skp = smk_find_entry(cp); |
362 | kfree(cp); | |
0e94ae17 | 363 | if (skp == NULL) |
398ce073 | 364 | return -ENOENT; |
21c7eae2 | 365 | rule->smk_object = skp; |
0e94ae17 | 366 | } |
7198e2ee | 367 | |
e05b6f98 RK |
368 | rule->smk_access1 = smk_perm_from_str(access1); |
369 | if (access2) | |
370 | rule->smk_access2 = smk_perm_from_str(access2); | |
371 | else | |
372 | rule->smk_access2 = ~rule->smk_access1; | |
e114e473 | 373 | |
3518721a | 374 | return 0; |
f7112e6c | 375 | } |
e114e473 | 376 | |
f7112e6c CS |
377 | /** |
378 | * smk_parse_rule - parse Smack rule from load string | |
379 | * @data: string to be parsed whose size is SMK_LOADLEN | |
380 | * @rule: Smack rule | |
381 | * @import: if non-zero, import labels | |
382 | * | |
383 | * Returns 0 on success, -1 on errors. | |
384 | */ | |
e05b6f98 RK |
385 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
386 | int import) | |
f7112e6c CS |
387 | { |
388 | int rc; | |
e114e473 | 389 | |
f7112e6c | 390 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
e05b6f98 RK |
391 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
392 | import, SMK_LABELLEN); | |
f7112e6c CS |
393 | return rc; |
394 | } | |
e114e473 | 395 | |
f7112e6c CS |
396 | /** |
397 | * smk_parse_long_rule - parse Smack rule from rule string | |
398 | * @data: string to be parsed, null terminated | |
e05b6f98 | 399 | * @rule: Will be filled with Smack parsed rule |
f7112e6c | 400 | * @import: if non-zero, import labels |
10289b0f | 401 | * @tokens: numer of substrings expected in data |
f7112e6c | 402 | * |
10289b0f | 403 | * Returns number of processed bytes on success, -1 on failure. |
f7112e6c | 404 | */ |
10289b0f RK |
405 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
406 | int import, int tokens) | |
f7112e6c | 407 | { |
10289b0f RK |
408 | ssize_t cnt = 0; |
409 | char *tok[4]; | |
398ce073 | 410 | int rc; |
10289b0f RK |
411 | int i; |
412 | ||
413 | /* | |
414 | * Parsing the rule in-place, filling all white-spaces with '\0' | |
415 | */ | |
416 | for (i = 0; i < tokens; ++i) { | |
417 | while (isspace(data[cnt])) | |
418 | data[cnt++] = '\0'; | |
419 | ||
420 | if (data[cnt] == '\0') | |
421 | /* Unexpected end of data */ | |
422 | return -1; | |
423 | ||
424 | tok[i] = data + cnt; | |
425 | ||
426 | while (data[cnt] && !isspace(data[cnt])) | |
427 | ++cnt; | |
e05b6f98 | 428 | } |
10289b0f RK |
429 | while (isspace(data[cnt])) |
430 | data[cnt++] = '\0'; | |
f7112e6c | 431 | |
10289b0f RK |
432 | while (i < 4) |
433 | tok[i++] = NULL; | |
434 | ||
398ce073 JS |
435 | rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
436 | return rc == 0 ? cnt : rc; | |
828716c2 JS |
437 | } |
438 | ||
f7112e6c CS |
439 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
440 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
e05b6f98 | 441 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
828716c2 | 442 | /** |
f7112e6c | 443 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
444 | * @file: file pointer, not actually used |
445 | * @buf: where to get the data from | |
446 | * @count: bytes sent | |
447 | * @ppos: where to start - must be 0 | |
448 | * @rule_list: the list of rules to write to | |
449 | * @rule_lock: lock for the rule list | |
e05b6f98 | 450 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 JS |
451 | * |
452 | * Get one smack access rule from above. | |
f7112e6c CS |
453 | * The format for SMK_LONG_FMT is: |
454 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
455 | * The format for SMK_FIXED24_FMT is exactly: | |
456 | * "subject object rwxat" | |
e05b6f98 RK |
457 | * The format for SMK_CHANGE_FMT is: |
458 | * "subject<whitespace>object<whitespace> | |
459 | * acc_enable<whitespace>acc_disable[<whitespace>...]" | |
828716c2 | 460 | */ |
f7112e6c CS |
461 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
462 | size_t count, loff_t *ppos, | |
463 | struct list_head *rule_list, | |
464 | struct mutex *rule_lock, int format) | |
828716c2 | 465 | { |
470043ba | 466 | struct smack_parsed_rule rule; |
828716c2 | 467 | char *data; |
10289b0f RK |
468 | int rc; |
469 | int trunc = 0; | |
470 | int tokens; | |
471 | ssize_t cnt = 0; | |
828716c2 JS |
472 | |
473 | /* | |
474 | * No partial writes. | |
475 | * Enough data must be present. | |
476 | */ | |
477 | if (*ppos != 0) | |
478 | return -EINVAL; | |
828716c2 | 479 | |
f7112e6c CS |
480 | if (format == SMK_FIXED24_FMT) { |
481 | /* | |
482 | * Minor hack for backward compatibility | |
483 | */ | |
c0ab6e56 | 484 | if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
f7112e6c | 485 | return -EINVAL; |
10289b0f RK |
486 | } else { |
487 | if (count >= PAGE_SIZE) { | |
488 | count = PAGE_SIZE - 1; | |
489 | trunc = 1; | |
490 | } | |
491 | } | |
f7112e6c | 492 | |
10289b0f | 493 | data = kmalloc(count + 1, GFP_KERNEL); |
828716c2 JS |
494 | if (data == NULL) |
495 | return -ENOMEM; | |
496 | ||
497 | if (copy_from_user(data, buf, count) != 0) { | |
498 | rc = -EFAULT; | |
499 | goto out; | |
500 | } | |
501 | ||
10289b0f RK |
502 | /* |
503 | * In case of parsing only part of user buf, | |
504 | * avoid having partial rule at the data buffer | |
505 | */ | |
506 | if (trunc) { | |
507 | while (count > 0 && (data[count - 1] != '\n')) | |
508 | --count; | |
509 | if (count == 0) { | |
510 | rc = -EINVAL; | |
470043ba | 511 | goto out; |
10289b0f | 512 | } |
f7112e6c CS |
513 | } |
514 | ||
10289b0f RK |
515 | data[count] = '\0'; |
516 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); | |
517 | while (cnt < count) { | |
518 | if (format == SMK_FIXED24_FMT) { | |
519 | rc = smk_parse_rule(data, &rule, 1); | |
520 | if (rc != 0) { | |
521 | rc = -EINVAL; | |
522 | goto out; | |
523 | } | |
524 | cnt = count; | |
525 | } else { | |
526 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); | |
527 | if (rc <= 0) { | |
528 | rc = -EINVAL; | |
529 | goto out; | |
530 | } | |
531 | cnt += rc; | |
532 | } | |
533 | ||
534 | if (rule_list == NULL) | |
535 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, | |
536 | &rule.smk_subject->smk_rules_lock, 1); | |
537 | else | |
538 | rc = smk_set_access(&rule, rule_list, rule_lock, 0); | |
539 | ||
540 | if (rc) | |
541 | goto out; | |
272cd7a8 CS |
542 | } |
543 | ||
10289b0f | 544 | rc = cnt; |
e114e473 CS |
545 | out: |
546 | kfree(data); | |
547 | return rc; | |
548 | } | |
549 | ||
7898e1f8 | 550 | /* |
40809565 | 551 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
552 | */ |
553 | ||
40809565 CS |
554 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
555 | struct list_head *head) | |
7898e1f8 | 556 | { |
272cd7a8 CS |
557 | struct list_head *list; |
558 | ||
559 | /* | |
560 | * This is 0 the first time through. | |
561 | */ | |
562 | if (s->index == 0) | |
40809565 | 563 | s->private = head; |
272cd7a8 CS |
564 | |
565 | if (s->private == NULL) | |
7898e1f8 | 566 | return NULL; |
272cd7a8 CS |
567 | |
568 | list = s->private; | |
569 | if (list_empty(list)) | |
7898e1f8 | 570 | return NULL; |
272cd7a8 CS |
571 | |
572 | if (s->index == 0) | |
573 | return list->next; | |
574 | return list; | |
7898e1f8 CS |
575 | } |
576 | ||
40809565 CS |
577 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
578 | struct list_head *head) | |
7898e1f8 CS |
579 | { |
580 | struct list_head *list = v; | |
581 | ||
40809565 | 582 | if (list_is_last(list, head)) { |
272cd7a8 | 583 | s->private = NULL; |
7898e1f8 CS |
584 | return NULL; |
585 | } | |
272cd7a8 | 586 | s->private = list->next; |
7898e1f8 CS |
587 | return list->next; |
588 | } | |
589 | ||
40809565 CS |
590 | static void smk_seq_stop(struct seq_file *s, void *v) |
591 | { | |
592 | /* No-op */ | |
593 | } | |
594 | ||
f7112e6c | 595 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 596 | { |
f7112e6c CS |
597 | /* |
598 | * Don't show any rules with label names too long for | |
599 | * interface file (/smack/load or /smack/load2) | |
600 | * because you should expect to be able to write | |
601 | * anything you read back. | |
602 | */ | |
2f823ff8 | 603 | if (strlen(srp->smk_subject->smk_known) >= max || |
21c7eae2 | 604 | strlen(srp->smk_object->smk_known) >= max) |
f7112e6c | 605 | return; |
7898e1f8 | 606 | |
65ee7f45 RK |
607 | if (srp->smk_access == 0) |
608 | return; | |
609 | ||
21c7eae2 LP |
610 | seq_printf(s, "%s %s", |
611 | srp->smk_subject->smk_known, | |
612 | srp->smk_object->smk_known); | |
7898e1f8 CS |
613 | |
614 | seq_putc(s, ' '); | |
615 | ||
616 | if (srp->smk_access & MAY_READ) | |
617 | seq_putc(s, 'r'); | |
618 | if (srp->smk_access & MAY_WRITE) | |
619 | seq_putc(s, 'w'); | |
620 | if (srp->smk_access & MAY_EXEC) | |
621 | seq_putc(s, 'x'); | |
622 | if (srp->smk_access & MAY_APPEND) | |
623 | seq_putc(s, 'a'); | |
624 | if (srp->smk_access & MAY_TRANSMUTE) | |
625 | seq_putc(s, 't'); | |
c0ab6e56 CS |
626 | if (srp->smk_access & MAY_LOCK) |
627 | seq_putc(s, 'l'); | |
d166c802 CS |
628 | if (srp->smk_access & MAY_BRINGUP) |
629 | seq_putc(s, 'b'); | |
7898e1f8 CS |
630 | |
631 | seq_putc(s, '\n'); | |
f7112e6c CS |
632 | } |
633 | ||
634 | /* | |
635 | * Seq_file read operations for /smack/load | |
636 | */ | |
637 | ||
638 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
639 | { | |
640 | return smk_seq_start(s, pos, &smack_rule_list); | |
641 | } | |
642 | ||
643 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
644 | { | |
645 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
646 | } | |
647 | ||
648 | static int load_seq_show(struct seq_file *s, void *v) | |
649 | { | |
650 | struct list_head *list = v; | |
651 | struct smack_master_list *smlp = | |
652 | list_entry(list, struct smack_master_list, list); | |
653 | ||
654 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
655 | |
656 | return 0; | |
657 | } | |
658 | ||
7898e1f8 | 659 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
660 | .start = load2_seq_start, |
661 | .next = load2_seq_next, | |
7898e1f8 | 662 | .show = load_seq_show, |
40809565 | 663 | .stop = smk_seq_stop, |
7898e1f8 CS |
664 | }; |
665 | ||
666 | /** | |
667 | * smk_open_load - open() for /smack/load | |
668 | * @inode: inode structure representing file | |
669 | * @file: "load" file pointer | |
670 | * | |
671 | * For reading, use load_seq_* seq_file reading operations. | |
672 | */ | |
673 | static int smk_open_load(struct inode *inode, struct file *file) | |
674 | { | |
675 | return seq_open(file, &load_seq_ops); | |
676 | } | |
677 | ||
678 | /** | |
679 | * smk_write_load - write() for /smack/load | |
680 | * @file: file pointer, not actually used | |
681 | * @buf: where to get the data from | |
682 | * @count: bytes sent | |
683 | * @ppos: where to start - must be 0 | |
684 | * | |
685 | */ | |
686 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
687 | size_t count, loff_t *ppos) | |
688 | { | |
7898e1f8 CS |
689 | /* |
690 | * Must have privilege. | |
691 | * No partial writes. | |
692 | * Enough data must be present. | |
693 | */ | |
1880eff7 | 694 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
695 | return -EPERM; |
696 | ||
f7112e6c CS |
697 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
698 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
699 | } |
700 | ||
e114e473 CS |
701 | static const struct file_operations smk_load_ops = { |
702 | .open = smk_open_load, | |
703 | .read = seq_read, | |
704 | .llseek = seq_lseek, | |
705 | .write = smk_write_load, | |
cb622bbb | 706 | .release = seq_release, |
e114e473 CS |
707 | }; |
708 | ||
709 | /** | |
710 | * smk_cipso_doi - initialize the CIPSO domain | |
711 | */ | |
30aa4faf | 712 | static void smk_cipso_doi(void) |
e114e473 CS |
713 | { |
714 | int rc; | |
715 | struct cipso_v4_doi *doip; | |
6d3dc07c | 716 | struct netlbl_audit nai; |
e114e473 | 717 | |
6d3dc07c | 718 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 719 | |
6d3dc07c | 720 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
721 | if (rc != 0) |
722 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
723 | __func__, __LINE__, rc); | |
724 | ||
725 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
726 | if (doip == NULL) | |
727 | panic("smack: Failed to initialize cipso DOI.\n"); | |
728 | doip->map.std = NULL; | |
729 | doip->doi = smk_cipso_doi_value; | |
730 | doip->type = CIPSO_V4_MAP_PASS; | |
731 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
732 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
733 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
734 | ||
6d3dc07c | 735 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 736 | if (rc != 0) { |
6c2e8ac0 PM |
737 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
738 | __func__, __LINE__, rc); | |
739 | kfree(doip); | |
740 | return; | |
741 | } | |
6d3dc07c | 742 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
743 | if (rc != 0) { |
744 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 745 | __func__, __LINE__, rc); |
b1edeb10 | 746 | kfree(doip); |
6c2e8ac0 | 747 | return; |
b1edeb10 | 748 | } |
e114e473 CS |
749 | } |
750 | ||
4bc87e62 CS |
751 | /** |
752 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 753 | * @oldambient: previous domain string |
4bc87e62 | 754 | */ |
30aa4faf | 755 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
756 | { |
757 | int rc; | |
6d3dc07c | 758 | struct netlbl_audit nai; |
4bc87e62 | 759 | |
6d3dc07c | 760 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
761 | |
762 | if (oldambient != NULL) { | |
6d3dc07c | 763 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
764 | if (rc != 0) |
765 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
766 | __func__, __LINE__, rc); | |
767 | } | |
f7112e6c | 768 | if (smack_net_ambient == NULL) |
2f823ff8 | 769 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 770 | |
2f823ff8 | 771 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 772 | NULL, NULL, &nai); |
4bc87e62 CS |
773 | if (rc != 0) |
774 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
775 | __func__, __LINE__, rc); | |
776 | } | |
777 | ||
e114e473 CS |
778 | /* |
779 | * Seq_file read operations for /smack/cipso | |
780 | */ | |
781 | ||
782 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
783 | { | |
40809565 | 784 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
785 | } |
786 | ||
787 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
788 | { | |
40809565 | 789 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
790 | } |
791 | ||
792 | /* | |
793 | * Print cipso labels in format: | |
794 | * label level[/cat[,cat]] | |
795 | */ | |
796 | static int cipso_seq_show(struct seq_file *s, void *v) | |
797 | { | |
7198e2ee EB |
798 | struct list_head *list = v; |
799 | struct smack_known *skp = | |
800 | list_entry(list, struct smack_known, list); | |
4fbe63d1 | 801 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 802 | char sep = '/'; |
e114e473 | 803 | int i; |
e114e473 | 804 | |
f7112e6c CS |
805 | /* |
806 | * Don't show a label that could not have been set using | |
807 | * /smack/cipso. This is in support of the notion that | |
808 | * anything read from /smack/cipso ought to be writeable | |
809 | * to /smack/cipso. | |
810 | * | |
811 | * /smack/cipso2 should be used instead. | |
812 | */ | |
813 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
814 | return 0; |
815 | ||
f7112e6c | 816 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 817 | |
4fbe63d1 PM |
818 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
819 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
820 | seq_printf(s, "%c%d", sep, i); |
821 | sep = ','; | |
822 | } | |
e114e473 CS |
823 | |
824 | seq_putc(s, '\n'); | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
88e9d34c | 829 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 830 | .start = cipso_seq_start, |
e114e473 CS |
831 | .next = cipso_seq_next, |
832 | .show = cipso_seq_show, | |
40809565 | 833 | .stop = smk_seq_stop, |
e114e473 CS |
834 | }; |
835 | ||
836 | /** | |
837 | * smk_open_cipso - open() for /smack/cipso | |
838 | * @inode: inode structure representing file | |
839 | * @file: "cipso" file pointer | |
840 | * | |
841 | * Connect our cipso_seq_* operations with /smack/cipso | |
842 | * file_operations | |
843 | */ | |
844 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
845 | { | |
846 | return seq_open(file, &cipso_seq_ops); | |
847 | } | |
848 | ||
849 | /** | |
f7112e6c | 850 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 851 | * @file: file pointer, not actually used |
e114e473 CS |
852 | * @buf: where to get the data from |
853 | * @count: bytes sent | |
854 | * @ppos: where to start | |
f7112e6c | 855 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
856 | * |
857 | * Accepts only one cipso rule per write call. | |
858 | * Returns number of bytes written or error code, as appropriate | |
859 | */ | |
f7112e6c CS |
860 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
861 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
862 | { |
863 | struct smack_known *skp; | |
f7112e6c CS |
864 | struct netlbl_lsm_secattr ncats; |
865 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 866 | int maplevel; |
f7112e6c | 867 | unsigned int cat; |
e114e473 CS |
868 | int catlen; |
869 | ssize_t rc = -EINVAL; | |
870 | char *data = NULL; | |
871 | char *rule; | |
872 | int ret; | |
873 | int i; | |
874 | ||
875 | /* | |
876 | * Must have privilege. | |
877 | * No partial writes. | |
878 | * Enough data must be present. | |
879 | */ | |
1880eff7 | 880 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
881 | return -EPERM; |
882 | if (*ppos != 0) | |
883 | return -EINVAL; | |
f7112e6c CS |
884 | if (format == SMK_FIXED24_FMT && |
885 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
886 | return -EINVAL; |
887 | ||
888 | data = kzalloc(count + 1, GFP_KERNEL); | |
889 | if (data == NULL) | |
890 | return -ENOMEM; | |
891 | ||
892 | if (copy_from_user(data, buf, count) != 0) { | |
893 | rc = -EFAULT; | |
894 | goto unlockedout; | |
895 | } | |
896 | ||
897 | data[count] = '\0'; | |
898 | rule = data; | |
899 | /* | |
900 | * Only allow one writer at a time. Writes should be | |
901 | * quite rare and small in any case. | |
902 | */ | |
903 | mutex_lock(&smack_cipso_lock); | |
904 | ||
905 | skp = smk_import_entry(rule, 0); | |
906 | if (skp == NULL) | |
907 | goto out; | |
908 | ||
f7112e6c CS |
909 | if (format == SMK_FIXED24_FMT) |
910 | rule += SMK_LABELLEN; | |
911 | else | |
0fcfee61 | 912 | rule += strlen(skp->smk_known) + 1; |
f7112e6c | 913 | |
e114e473 CS |
914 | ret = sscanf(rule, "%d", &maplevel); |
915 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
916 | goto out; | |
917 | ||
918 | rule += SMK_DIGITLEN; | |
919 | ret = sscanf(rule, "%d", &catlen); | |
920 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
921 | goto out; | |
922 | ||
f7112e6c CS |
923 | if (format == SMK_FIXED24_FMT && |
924 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
925 | goto out; |
926 | ||
927 | memset(mapcatset, 0, sizeof(mapcatset)); | |
928 | ||
929 | for (i = 0; i < catlen; i++) { | |
930 | rule += SMK_DIGITLEN; | |
f7112e6c | 931 | ret = sscanf(rule, "%u", &cat); |
677264e8 | 932 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
933 | goto out; |
934 | ||
935 | smack_catset_bit(cat, mapcatset); | |
936 | } | |
937 | ||
f7112e6c CS |
938 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
939 | if (rc >= 0) { | |
4fbe63d1 | 940 | netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat); |
f7112e6c CS |
941 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
942 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
943 | rc = count; | |
e114e473 CS |
944 | } |
945 | ||
e114e473 CS |
946 | out: |
947 | mutex_unlock(&smack_cipso_lock); | |
948 | unlockedout: | |
949 | kfree(data); | |
950 | return rc; | |
951 | } | |
952 | ||
f7112e6c CS |
953 | /** |
954 | * smk_write_cipso - write() for /smack/cipso | |
955 | * @file: file pointer, not actually used | |
956 | * @buf: where to get the data from | |
957 | * @count: bytes sent | |
958 | * @ppos: where to start | |
959 | * | |
960 | * Accepts only one cipso rule per write call. | |
961 | * Returns number of bytes written or error code, as appropriate | |
962 | */ | |
963 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
964 | size_t count, loff_t *ppos) | |
965 | { | |
966 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
967 | } | |
968 | ||
e114e473 CS |
969 | static const struct file_operations smk_cipso_ops = { |
970 | .open = smk_open_cipso, | |
971 | .read = seq_read, | |
972 | .llseek = seq_lseek, | |
973 | .write = smk_write_cipso, | |
974 | .release = seq_release, | |
975 | }; | |
976 | ||
f7112e6c CS |
977 | /* |
978 | * Seq_file read operations for /smack/cipso2 | |
979 | */ | |
980 | ||
981 | /* | |
982 | * Print cipso labels in format: | |
983 | * label level[/cat[,cat]] | |
984 | */ | |
985 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
986 | { | |
987 | struct list_head *list = v; | |
988 | struct smack_known *skp = | |
989 | list_entry(list, struct smack_known, list); | |
4fbe63d1 | 990 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
f7112e6c CS |
991 | char sep = '/'; |
992 | int i; | |
993 | ||
994 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
995 | ||
4fbe63d1 PM |
996 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
997 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
998 | seq_printf(s, "%c%d", sep, i); |
999 | sep = ','; | |
1000 | } | |
1001 | ||
1002 | seq_putc(s, '\n'); | |
1003 | ||
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | static const struct seq_operations cipso2_seq_ops = { | |
1008 | .start = cipso_seq_start, | |
1009 | .next = cipso_seq_next, | |
1010 | .show = cipso2_seq_show, | |
1011 | .stop = smk_seq_stop, | |
1012 | }; | |
1013 | ||
1014 | /** | |
1015 | * smk_open_cipso2 - open() for /smack/cipso2 | |
1016 | * @inode: inode structure representing file | |
1017 | * @file: "cipso2" file pointer | |
1018 | * | |
1019 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
1020 | * file_operations | |
1021 | */ | |
1022 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
1023 | { | |
1024 | return seq_open(file, &cipso2_seq_ops); | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * smk_write_cipso2 - write() for /smack/cipso2 | |
1029 | * @file: file pointer, not actually used | |
1030 | * @buf: where to get the data from | |
1031 | * @count: bytes sent | |
1032 | * @ppos: where to start | |
1033 | * | |
1034 | * Accepts only one cipso rule per write call. | |
1035 | * Returns number of bytes written or error code, as appropriate | |
1036 | */ | |
1037 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1038 | size_t count, loff_t *ppos) | |
1039 | { | |
1040 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1041 | } | |
1042 | ||
1043 | static const struct file_operations smk_cipso2_ops = { | |
1044 | .open = smk_open_cipso2, | |
1045 | .read = seq_read, | |
1046 | .llseek = seq_lseek, | |
1047 | .write = smk_write_cipso2, | |
1048 | .release = seq_release, | |
1049 | }; | |
1050 | ||
6d3dc07c CS |
1051 | /* |
1052 | * Seq_file read operations for /smack/netlabel | |
1053 | */ | |
1054 | ||
1055 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
1056 | { | |
40809565 | 1057 | return smk_seq_start(s, pos, &smk_netlbladdr_list); |
6d3dc07c CS |
1058 | } |
1059 | ||
1060 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1061 | { | |
40809565 | 1062 | return smk_seq_next(s, v, pos, &smk_netlbladdr_list); |
6d3dc07c | 1063 | } |
6d3dc07c CS |
1064 | #define BEBITS (sizeof(__be32) * 8) |
1065 | ||
1066 | /* | |
1067 | * Print host/label pairs | |
1068 | */ | |
1069 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
1070 | { | |
7198e2ee EB |
1071 | struct list_head *list = v; |
1072 | struct smk_netlbladdr *skp = | |
1073 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 1074 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 1075 | int maskn; |
1076 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 1077 | |
113a0e45 | 1078 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
1079 | |
1080 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
21c7eae2 | 1081 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label->smk_known); |
6d3dc07c CS |
1082 | |
1083 | return 0; | |
1084 | } | |
1085 | ||
88e9d34c | 1086 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c | 1087 | .start = netlbladdr_seq_start, |
6d3dc07c CS |
1088 | .next = netlbladdr_seq_next, |
1089 | .show = netlbladdr_seq_show, | |
40809565 | 1090 | .stop = smk_seq_stop, |
6d3dc07c CS |
1091 | }; |
1092 | ||
1093 | /** | |
1094 | * smk_open_netlbladdr - open() for /smack/netlabel | |
1095 | * @inode: inode structure representing file | |
1096 | * @file: "netlabel" file pointer | |
1097 | * | |
1098 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
1099 | * file_operations | |
1100 | */ | |
1101 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
1102 | { | |
1103 | return seq_open(file, &netlbladdr_seq_ops); | |
1104 | } | |
1105 | ||
113a0e45 | 1106 | /** |
1107 | * smk_netlbladdr_insert | |
1108 | * @new : netlabel to insert | |
1109 | * | |
1110 | * This helper insert netlabel in the smack_netlbladdrs list | |
1111 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
1112 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
1113 | * | |
113a0e45 | 1114 | */ |
1115 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
1116 | { | |
7198e2ee | 1117 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 1118 | |
7198e2ee EB |
1119 | if (list_empty(&smk_netlbladdr_list)) { |
1120 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1121 | return; |
1122 | } | |
1123 | ||
05725f7e JP |
1124 | m = list_entry_rcu(smk_netlbladdr_list.next, |
1125 | struct smk_netlbladdr, list); | |
7198e2ee | 1126 | |
113a0e45 | 1127 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
1128 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
1129 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1130 | return; |
1131 | } | |
7198e2ee EB |
1132 | |
1133 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
1134 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
1135 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1136 | return; |
1137 | } | |
05725f7e JP |
1138 | m_next = list_entry_rcu(m->list.next, |
1139 | struct smk_netlbladdr, list); | |
7198e2ee EB |
1140 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
1141 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1142 | return; |
1143 | } | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | ||
6d3dc07c CS |
1148 | /** |
1149 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 1150 | * @file: file pointer, not actually used |
6d3dc07c CS |
1151 | * @buf: where to get the data from |
1152 | * @count: bytes sent | |
1153 | * @ppos: where to start | |
1154 | * | |
1155 | * Accepts only one netlbladdr per write call. | |
1156 | * Returns number of bytes written or error code, as appropriate | |
1157 | */ | |
1158 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
1159 | size_t count, loff_t *ppos) | |
1160 | { | |
21c7eae2 | 1161 | struct smk_netlbladdr *snp; |
6d3dc07c | 1162 | struct sockaddr_in newname; |
f7112e6c | 1163 | char *smack; |
21c7eae2 | 1164 | struct smack_known *skp; |
f7112e6c | 1165 | char *data; |
6d3dc07c CS |
1166 | char *host = (char *)&newname.sin_addr.s_addr; |
1167 | int rc; | |
1168 | struct netlbl_audit audit_info; | |
1169 | struct in_addr mask; | |
1170 | unsigned int m; | |
7198e2ee | 1171 | int found; |
113a0e45 | 1172 | u32 mask_bits = (1<<31); |
6d3dc07c | 1173 | __be32 nsa; |
113a0e45 | 1174 | u32 temp_mask; |
6d3dc07c CS |
1175 | |
1176 | /* | |
1177 | * Must have privilege. | |
1178 | * No partial writes. | |
1179 | * Enough data must be present. | |
1180 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1181 | * "<addr, as a.b.c.d><space><label>" | |
1182 | */ | |
1880eff7 | 1183 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1184 | return -EPERM; |
1185 | if (*ppos != 0) | |
1186 | return -EINVAL; | |
f7112e6c | 1187 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1188 | return -EINVAL; |
f7112e6c CS |
1189 | |
1190 | data = kzalloc(count + 1, GFP_KERNEL); | |
1191 | if (data == NULL) | |
1192 | return -ENOMEM; | |
1193 | ||
1194 | if (copy_from_user(data, buf, count) != 0) { | |
1195 | rc = -EFAULT; | |
1196 | goto free_data_out; | |
1197 | } | |
1198 | ||
1199 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1200 | if (smack == NULL) { | |
1201 | rc = -ENOMEM; | |
1202 | goto free_data_out; | |
1203 | } | |
6d3dc07c CS |
1204 | |
1205 | data[count] = '\0'; | |
1206 | ||
ec554fa7 | 1207 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
6d3dc07c CS |
1208 | &host[0], &host[1], &host[2], &host[3], &m, smack); |
1209 | if (rc != 6) { | |
1210 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1211 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1212 | if (rc != 5) { |
1213 | rc = -EINVAL; | |
1214 | goto free_out; | |
1215 | } | |
6d3dc07c CS |
1216 | m = BEBITS; |
1217 | } | |
f7112e6c CS |
1218 | if (m > BEBITS) { |
1219 | rc = -EINVAL; | |
1220 | goto free_out; | |
1221 | } | |
6d3dc07c | 1222 | |
f7112e6c CS |
1223 | /* |
1224 | * If smack begins with '-', it is an option, don't import it | |
1225 | */ | |
4303154e | 1226 | if (smack[0] != '-') { |
21c7eae2 LP |
1227 | skp = smk_import_entry(smack, 0); |
1228 | if (skp == NULL) { | |
f7112e6c CS |
1229 | rc = -EINVAL; |
1230 | goto free_out; | |
1231 | } | |
4303154e EB |
1232 | } else { |
1233 | /* check known options */ | |
21c7eae2 LP |
1234 | if (strcmp(smack, smack_cipso_option.smk_known) == 0) |
1235 | skp = &smack_cipso_option; | |
f7112e6c CS |
1236 | else { |
1237 | rc = -EINVAL; | |
1238 | goto free_out; | |
1239 | } | |
4303154e | 1240 | } |
6d3dc07c | 1241 | |
113a0e45 | 1242 | for (temp_mask = 0; m > 0; m--) { |
1243 | temp_mask |= mask_bits; | |
1244 | mask_bits >>= 1; | |
6d3dc07c | 1245 | } |
113a0e45 | 1246 | mask.s_addr = cpu_to_be32(temp_mask); |
1247 | ||
1248 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1249 | /* |
1250 | * Only allow one writer at a time. Writes should be | |
1251 | * quite rare and small in any case. | |
1252 | */ | |
1253 | mutex_lock(&smk_netlbladdr_lock); | |
1254 | ||
1255 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1256 | /* try to find if the prefix is already in the list */ |
7198e2ee | 1257 | found = 0; |
21c7eae2 LP |
1258 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) { |
1259 | if (snp->smk_host.sin_addr.s_addr == nsa && | |
1260 | snp->smk_mask.s_addr == mask.s_addr) { | |
7198e2ee | 1261 | found = 1; |
6d3dc07c | 1262 | break; |
7198e2ee EB |
1263 | } |
1264 | } | |
6d3dc07c CS |
1265 | smk_netlabel_audit_set(&audit_info); |
1266 | ||
7198e2ee | 1267 | if (found == 0) { |
21c7eae2 LP |
1268 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
1269 | if (snp == NULL) | |
6d3dc07c CS |
1270 | rc = -ENOMEM; |
1271 | else { | |
1272 | rc = 0; | |
21c7eae2 LP |
1273 | snp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; |
1274 | snp->smk_mask.s_addr = mask.s_addr; | |
1275 | snp->smk_label = skp; | |
1276 | smk_netlbladdr_insert(snp); | |
6d3dc07c CS |
1277 | } |
1278 | } else { | |
4303154e | 1279 | /* we delete the unlabeled entry, only if the previous label |
25985edc | 1280 | * wasn't the special CIPSO option */ |
21c7eae2 | 1281 | if (snp->smk_label != &smack_cipso_option) |
4303154e | 1282 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
21c7eae2 | 1283 | &snp->smk_host.sin_addr, &snp->smk_mask, |
4303154e EB |
1284 | PF_INET, &audit_info); |
1285 | else | |
1286 | rc = 0; | |
21c7eae2 | 1287 | snp->smk_label = skp; |
6d3dc07c CS |
1288 | } |
1289 | ||
1290 | /* | |
1291 | * Now tell netlabel about the single label nature of | |
1292 | * this host so that incoming packets get labeled. | |
4303154e | 1293 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1294 | */ |
21c7eae2 | 1295 | if (rc == 0 && skp != &smack_cipso_option) |
6d3dc07c | 1296 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
21c7eae2 LP |
1297 | &snp->smk_host.sin_addr, &snp->smk_mask, PF_INET, |
1298 | snp->smk_label->smk_secid, &audit_info); | |
6d3dc07c CS |
1299 | |
1300 | if (rc == 0) | |
1301 | rc = count; | |
1302 | ||
1303 | mutex_unlock(&smk_netlbladdr_lock); | |
1304 | ||
f7112e6c CS |
1305 | free_out: |
1306 | kfree(smack); | |
1307 | free_data_out: | |
1308 | kfree(data); | |
1309 | ||
6d3dc07c CS |
1310 | return rc; |
1311 | } | |
1312 | ||
1313 | static const struct file_operations smk_netlbladdr_ops = { | |
1314 | .open = smk_open_netlbladdr, | |
1315 | .read = seq_read, | |
1316 | .llseek = seq_lseek, | |
1317 | .write = smk_write_netlbladdr, | |
1318 | .release = seq_release, | |
1319 | }; | |
1320 | ||
e114e473 CS |
1321 | /** |
1322 | * smk_read_doi - read() for /smack/doi | |
1323 | * @filp: file pointer, not actually used | |
1324 | * @buf: where to put the result | |
1325 | * @count: maximum to send along | |
1326 | * @ppos: where to start | |
1327 | * | |
1328 | * Returns number of bytes read or error code, as appropriate | |
1329 | */ | |
1330 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1331 | size_t count, loff_t *ppos) | |
1332 | { | |
1333 | char temp[80]; | |
1334 | ssize_t rc; | |
1335 | ||
1336 | if (*ppos != 0) | |
1337 | return 0; | |
1338 | ||
1339 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1340 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1341 | ||
1342 | return rc; | |
1343 | } | |
1344 | ||
1345 | /** | |
1346 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1347 | * @file: file pointer, not actually used |
e114e473 CS |
1348 | * @buf: where to get the data from |
1349 | * @count: bytes sent | |
1350 | * @ppos: where to start | |
1351 | * | |
1352 | * Returns number of bytes written or error code, as appropriate | |
1353 | */ | |
1354 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1355 | size_t count, loff_t *ppos) | |
1356 | { | |
1357 | char temp[80]; | |
1358 | int i; | |
1359 | ||
1880eff7 | 1360 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1361 | return -EPERM; |
1362 | ||
1363 | if (count >= sizeof(temp) || count == 0) | |
1364 | return -EINVAL; | |
1365 | ||
1366 | if (copy_from_user(temp, buf, count) != 0) | |
1367 | return -EFAULT; | |
1368 | ||
1369 | temp[count] = '\0'; | |
1370 | ||
1371 | if (sscanf(temp, "%d", &i) != 1) | |
1372 | return -EINVAL; | |
1373 | ||
1374 | smk_cipso_doi_value = i; | |
1375 | ||
1376 | smk_cipso_doi(); | |
1377 | ||
1378 | return count; | |
1379 | } | |
1380 | ||
1381 | static const struct file_operations smk_doi_ops = { | |
1382 | .read = smk_read_doi, | |
1383 | .write = smk_write_doi, | |
6038f373 | 1384 | .llseek = default_llseek, |
e114e473 CS |
1385 | }; |
1386 | ||
1387 | /** | |
1388 | * smk_read_direct - read() for /smack/direct | |
1389 | * @filp: file pointer, not actually used | |
1390 | * @buf: where to put the result | |
1391 | * @count: maximum to send along | |
1392 | * @ppos: where to start | |
1393 | * | |
1394 | * Returns number of bytes read or error code, as appropriate | |
1395 | */ | |
1396 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1397 | size_t count, loff_t *ppos) | |
1398 | { | |
1399 | char temp[80]; | |
1400 | ssize_t rc; | |
1401 | ||
1402 | if (*ppos != 0) | |
1403 | return 0; | |
1404 | ||
1405 | sprintf(temp, "%d", smack_cipso_direct); | |
1406 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1407 | ||
1408 | return rc; | |
1409 | } | |
1410 | ||
1411 | /** | |
1412 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1413 | * @file: file pointer, not actually used |
e114e473 CS |
1414 | * @buf: where to get the data from |
1415 | * @count: bytes sent | |
1416 | * @ppos: where to start | |
1417 | * | |
1418 | * Returns number of bytes written or error code, as appropriate | |
1419 | */ | |
1420 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1421 | size_t count, loff_t *ppos) | |
1422 | { | |
f7112e6c | 1423 | struct smack_known *skp; |
e114e473 CS |
1424 | char temp[80]; |
1425 | int i; | |
1426 | ||
1880eff7 | 1427 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1428 | return -EPERM; |
1429 | ||
1430 | if (count >= sizeof(temp) || count == 0) | |
1431 | return -EINVAL; | |
1432 | ||
1433 | if (copy_from_user(temp, buf, count) != 0) | |
1434 | return -EFAULT; | |
1435 | ||
1436 | temp[count] = '\0'; | |
1437 | ||
1438 | if (sscanf(temp, "%d", &i) != 1) | |
1439 | return -EINVAL; | |
1440 | ||
f7112e6c CS |
1441 | /* |
1442 | * Don't do anything if the value hasn't actually changed. | |
1443 | * If it is changing reset the level on entries that were | |
1444 | * set up to be direct when they were created. | |
1445 | */ | |
1446 | if (smack_cipso_direct != i) { | |
1447 | mutex_lock(&smack_known_lock); | |
1448 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1449 | if (skp->smk_netlabel.attr.mls.lvl == | |
1450 | smack_cipso_direct) | |
1451 | skp->smk_netlabel.attr.mls.lvl = i; | |
1452 | smack_cipso_direct = i; | |
1453 | mutex_unlock(&smack_known_lock); | |
1454 | } | |
e114e473 CS |
1455 | |
1456 | return count; | |
1457 | } | |
1458 | ||
1459 | static const struct file_operations smk_direct_ops = { | |
1460 | .read = smk_read_direct, | |
1461 | .write = smk_write_direct, | |
6038f373 | 1462 | .llseek = default_llseek, |
e114e473 CS |
1463 | }; |
1464 | ||
f7112e6c CS |
1465 | /** |
1466 | * smk_read_mapped - read() for /smack/mapped | |
1467 | * @filp: file pointer, not actually used | |
1468 | * @buf: where to put the result | |
1469 | * @count: maximum to send along | |
1470 | * @ppos: where to start | |
1471 | * | |
1472 | * Returns number of bytes read or error code, as appropriate | |
1473 | */ | |
1474 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1475 | size_t count, loff_t *ppos) | |
1476 | { | |
1477 | char temp[80]; | |
1478 | ssize_t rc; | |
1479 | ||
1480 | if (*ppos != 0) | |
1481 | return 0; | |
1482 | ||
1483 | sprintf(temp, "%d", smack_cipso_mapped); | |
1484 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1485 | ||
1486 | return rc; | |
1487 | } | |
1488 | ||
1489 | /** | |
1490 | * smk_write_mapped - write() for /smack/mapped | |
1491 | * @file: file pointer, not actually used | |
1492 | * @buf: where to get the data from | |
1493 | * @count: bytes sent | |
1494 | * @ppos: where to start | |
1495 | * | |
1496 | * Returns number of bytes written or error code, as appropriate | |
1497 | */ | |
1498 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1499 | size_t count, loff_t *ppos) | |
1500 | { | |
1501 | struct smack_known *skp; | |
1502 | char temp[80]; | |
1503 | int i; | |
1504 | ||
1880eff7 | 1505 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1506 | return -EPERM; |
1507 | ||
1508 | if (count >= sizeof(temp) || count == 0) | |
1509 | return -EINVAL; | |
1510 | ||
1511 | if (copy_from_user(temp, buf, count) != 0) | |
1512 | return -EFAULT; | |
1513 | ||
1514 | temp[count] = '\0'; | |
1515 | ||
1516 | if (sscanf(temp, "%d", &i) != 1) | |
1517 | return -EINVAL; | |
1518 | ||
1519 | /* | |
1520 | * Don't do anything if the value hasn't actually changed. | |
1521 | * If it is changing reset the level on entries that were | |
1522 | * set up to be mapped when they were created. | |
1523 | */ | |
1524 | if (smack_cipso_mapped != i) { | |
1525 | mutex_lock(&smack_known_lock); | |
1526 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1527 | if (skp->smk_netlabel.attr.mls.lvl == | |
1528 | smack_cipso_mapped) | |
1529 | skp->smk_netlabel.attr.mls.lvl = i; | |
1530 | smack_cipso_mapped = i; | |
1531 | mutex_unlock(&smack_known_lock); | |
1532 | } | |
1533 | ||
1534 | return count; | |
1535 | } | |
1536 | ||
1537 | static const struct file_operations smk_mapped_ops = { | |
1538 | .read = smk_read_mapped, | |
1539 | .write = smk_write_mapped, | |
1540 | .llseek = default_llseek, | |
1541 | }; | |
1542 | ||
e114e473 CS |
1543 | /** |
1544 | * smk_read_ambient - read() for /smack/ambient | |
1545 | * @filp: file pointer, not actually used | |
1546 | * @buf: where to put the result | |
1547 | * @cn: maximum to send along | |
1548 | * @ppos: where to start | |
1549 | * | |
1550 | * Returns number of bytes read or error code, as appropriate | |
1551 | */ | |
1552 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1553 | size_t cn, loff_t *ppos) | |
1554 | { | |
1555 | ssize_t rc; | |
e114e473 CS |
1556 | int asize; |
1557 | ||
1558 | if (*ppos != 0) | |
1559 | return 0; | |
1560 | /* | |
1561 | * Being careful to avoid a problem in the case where | |
1562 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1563 | */ |
4bc87e62 | 1564 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1565 | |
2f823ff8 | 1566 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1567 | |
1568 | if (cn >= asize) | |
1569 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1570 | smack_net_ambient->smk_known, |
1571 | asize); | |
4bc87e62 CS |
1572 | else |
1573 | rc = -EINVAL; | |
e114e473 | 1574 | |
4bc87e62 | 1575 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1576 | |
1577 | return rc; | |
1578 | } | |
1579 | ||
1580 | /** | |
1581 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1582 | * @file: file pointer, not actually used |
e114e473 CS |
1583 | * @buf: where to get the data from |
1584 | * @count: bytes sent | |
1585 | * @ppos: where to start | |
1586 | * | |
1587 | * Returns number of bytes written or error code, as appropriate | |
1588 | */ | |
1589 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1590 | size_t count, loff_t *ppos) | |
1591 | { | |
2f823ff8 | 1592 | struct smack_known *skp; |
4bc87e62 | 1593 | char *oldambient; |
f7112e6c CS |
1594 | char *data; |
1595 | int rc = count; | |
e114e473 | 1596 | |
1880eff7 | 1597 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1598 | return -EPERM; |
1599 | ||
f7112e6c CS |
1600 | data = kzalloc(count + 1, GFP_KERNEL); |
1601 | if (data == NULL) | |
1602 | return -ENOMEM; | |
e114e473 | 1603 | |
f7112e6c CS |
1604 | if (copy_from_user(data, buf, count) != 0) { |
1605 | rc = -EFAULT; | |
1606 | goto out; | |
1607 | } | |
e114e473 | 1608 | |
2f823ff8 CS |
1609 | skp = smk_import_entry(data, count); |
1610 | if (skp == NULL) { | |
f7112e6c CS |
1611 | rc = -EINVAL; |
1612 | goto out; | |
1613 | } | |
e114e473 | 1614 | |
4bc87e62 CS |
1615 | mutex_lock(&smack_ambient_lock); |
1616 | ||
2f823ff8 CS |
1617 | oldambient = smack_net_ambient->smk_known; |
1618 | smack_net_ambient = skp; | |
4bc87e62 CS |
1619 | smk_unlbl_ambient(oldambient); |
1620 | ||
1621 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1622 | |
f7112e6c CS |
1623 | out: |
1624 | kfree(data); | |
1625 | return rc; | |
e114e473 CS |
1626 | } |
1627 | ||
1628 | static const struct file_operations smk_ambient_ops = { | |
1629 | .read = smk_read_ambient, | |
1630 | .write = smk_write_ambient, | |
6038f373 | 1631 | .llseek = default_llseek, |
e114e473 CS |
1632 | }; |
1633 | ||
15446235 | 1634 | /** |
00f84f3f | 1635 | * smk_read_onlycap - read() for smackfs/onlycap |
15446235 CS |
1636 | * @filp: file pointer, not actually used |
1637 | * @buf: where to put the result | |
1638 | * @cn: maximum to send along | |
1639 | * @ppos: where to start | |
1640 | * | |
1641 | * Returns number of bytes read or error code, as appropriate | |
1642 | */ | |
1643 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1644 | size_t cn, loff_t *ppos) | |
1645 | { | |
1646 | char *smack = ""; | |
1647 | ssize_t rc = -EINVAL; | |
1648 | int asize; | |
1649 | ||
1650 | if (*ppos != 0) | |
1651 | return 0; | |
1652 | ||
1653 | if (smack_onlycap != NULL) | |
00f84f3f | 1654 | smack = smack_onlycap->smk_known; |
15446235 CS |
1655 | |
1656 | asize = strlen(smack) + 1; | |
1657 | ||
1658 | if (cn >= asize) | |
1659 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1660 | ||
1661 | return rc; | |
1662 | } | |
1663 | ||
1664 | /** | |
00f84f3f | 1665 | * smk_write_onlycap - write() for smackfs/onlycap |
251a2a95 | 1666 | * @file: file pointer, not actually used |
15446235 CS |
1667 | * @buf: where to get the data from |
1668 | * @count: bytes sent | |
1669 | * @ppos: where to start | |
1670 | * | |
1671 | * Returns number of bytes written or error code, as appropriate | |
1672 | */ | |
1673 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1674 | size_t count, loff_t *ppos) | |
1675 | { | |
f7112e6c | 1676 | char *data; |
2f823ff8 | 1677 | struct smack_known *skp = smk_of_task(current->cred->security); |
f7112e6c | 1678 | int rc = count; |
15446235 | 1679 | |
1880eff7 | 1680 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
1681 | return -EPERM; |
1682 | ||
1683 | /* | |
1684 | * This can be done using smk_access() but is done | |
1685 | * explicitly for clarity. The smk_access() implementation | |
1686 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1687 | */ | |
00f84f3f | 1688 | if (smack_onlycap != NULL && smack_onlycap != skp) |
15446235 CS |
1689 | return -EPERM; |
1690 | ||
b862e561 | 1691 | data = kzalloc(count + 1, GFP_KERNEL); |
f7112e6c CS |
1692 | if (data == NULL) |
1693 | return -ENOMEM; | |
15446235 CS |
1694 | |
1695 | /* | |
1696 | * Should the null string be passed in unset the onlycap value. | |
1697 | * This seems like something to be careful with as usually | |
1698 | * smk_import only expects to return NULL for errors. It | |
1699 | * is usually the case that a nullstring or "\n" would be | |
1700 | * bad to pass to smk_import but in fact this is useful here. | |
f7112e6c CS |
1701 | * |
1702 | * smk_import will also reject a label beginning with '-', | |
1703 | * so "-usecapabilities" will also work. | |
15446235 | 1704 | */ |
f7112e6c CS |
1705 | if (copy_from_user(data, buf, count) != 0) |
1706 | rc = -EFAULT; | |
1707 | else | |
00f84f3f | 1708 | smack_onlycap = smk_import_entry(data, count); |
15446235 | 1709 | |
f7112e6c CS |
1710 | kfree(data); |
1711 | return rc; | |
15446235 CS |
1712 | } |
1713 | ||
1714 | static const struct file_operations smk_onlycap_ops = { | |
1715 | .read = smk_read_onlycap, | |
1716 | .write = smk_write_onlycap, | |
6038f373 | 1717 | .llseek = default_llseek, |
15446235 CS |
1718 | }; |
1719 | ||
ecfcc53f EB |
1720 | /** |
1721 | * smk_read_logging - read() for /smack/logging | |
1722 | * @filp: file pointer, not actually used | |
1723 | * @buf: where to put the result | |
1724 | * @cn: maximum to send along | |
1725 | * @ppos: where to start | |
1726 | * | |
1727 | * Returns number of bytes read or error code, as appropriate | |
1728 | */ | |
1729 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1730 | size_t count, loff_t *ppos) | |
1731 | { | |
1732 | char temp[32]; | |
1733 | ssize_t rc; | |
1734 | ||
1735 | if (*ppos != 0) | |
1736 | return 0; | |
1737 | ||
1738 | sprintf(temp, "%d\n", log_policy); | |
1739 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1740 | return rc; | |
1741 | } | |
1742 | ||
1743 | /** | |
1744 | * smk_write_logging - write() for /smack/logging | |
1745 | * @file: file pointer, not actually used | |
1746 | * @buf: where to get the data from | |
1747 | * @count: bytes sent | |
1748 | * @ppos: where to start | |
1749 | * | |
1750 | * Returns number of bytes written or error code, as appropriate | |
1751 | */ | |
1752 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1753 | size_t count, loff_t *ppos) | |
1754 | { | |
1755 | char temp[32]; | |
1756 | int i; | |
1757 | ||
1880eff7 | 1758 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
1759 | return -EPERM; |
1760 | ||
1761 | if (count >= sizeof(temp) || count == 0) | |
1762 | return -EINVAL; | |
1763 | ||
1764 | if (copy_from_user(temp, buf, count) != 0) | |
1765 | return -EFAULT; | |
1766 | ||
1767 | temp[count] = '\0'; | |
1768 | ||
1769 | if (sscanf(temp, "%d", &i) != 1) | |
1770 | return -EINVAL; | |
1771 | if (i < 0 || i > 3) | |
1772 | return -EINVAL; | |
1773 | log_policy = i; | |
1774 | return count; | |
1775 | } | |
1776 | ||
1777 | ||
1778 | ||
1779 | static const struct file_operations smk_logging_ops = { | |
1780 | .read = smk_read_logging, | |
1781 | .write = smk_write_logging, | |
6038f373 | 1782 | .llseek = default_llseek, |
ecfcc53f | 1783 | }; |
7898e1f8 CS |
1784 | |
1785 | /* | |
1786 | * Seq_file read operations for /smack/load-self | |
1787 | */ | |
1788 | ||
1789 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
1790 | { | |
1791 | struct task_smack *tsp = current_security(); | |
1792 | ||
40809565 | 1793 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
1794 | } |
1795 | ||
1796 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1797 | { | |
1798 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 1799 | |
40809565 | 1800 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
1801 | } |
1802 | ||
1803 | static int load_self_seq_show(struct seq_file *s, void *v) | |
1804 | { | |
1805 | struct list_head *list = v; | |
1806 | struct smack_rule *srp = | |
1807 | list_entry(list, struct smack_rule, list); | |
1808 | ||
f7112e6c | 1809 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
1810 | |
1811 | return 0; | |
1812 | } | |
1813 | ||
7898e1f8 CS |
1814 | static const struct seq_operations load_self_seq_ops = { |
1815 | .start = load_self_seq_start, | |
1816 | .next = load_self_seq_next, | |
1817 | .show = load_self_seq_show, | |
40809565 | 1818 | .stop = smk_seq_stop, |
7898e1f8 CS |
1819 | }; |
1820 | ||
1821 | ||
1822 | /** | |
f7112e6c | 1823 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
1824 | * @inode: inode structure representing file |
1825 | * @file: "load" file pointer | |
1826 | * | |
1827 | * For reading, use load_seq_* seq_file reading operations. | |
1828 | */ | |
1829 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
1830 | { | |
1831 | return seq_open(file, &load_self_seq_ops); | |
1832 | } | |
1833 | ||
1834 | /** | |
1835 | * smk_write_load_self - write() for /smack/load-self | |
1836 | * @file: file pointer, not actually used | |
1837 | * @buf: where to get the data from | |
1838 | * @count: bytes sent | |
1839 | * @ppos: where to start - must be 0 | |
1840 | * | |
1841 | */ | |
1842 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
1843 | size_t count, loff_t *ppos) | |
1844 | { | |
1845 | struct task_smack *tsp = current_security(); | |
1846 | ||
f7112e6c CS |
1847 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
1848 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
1849 | } |
1850 | ||
1851 | static const struct file_operations smk_load_self_ops = { | |
1852 | .open = smk_open_load_self, | |
1853 | .read = seq_read, | |
1854 | .llseek = seq_lseek, | |
1855 | .write = smk_write_load_self, | |
1856 | .release = seq_release, | |
1857 | }; | |
828716c2 JS |
1858 | |
1859 | /** | |
f7112e6c | 1860 | * smk_user_access - handle access check transaction |
828716c2 JS |
1861 | * @file: file pointer |
1862 | * @buf: data from user space | |
1863 | * @count: bytes sent | |
1864 | * @ppos: where to start - must be 0 | |
1865 | */ | |
f7112e6c CS |
1866 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
1867 | size_t count, loff_t *ppos, int format) | |
828716c2 | 1868 | { |
e05b6f98 | 1869 | struct smack_parsed_rule rule; |
828716c2 | 1870 | char *data; |
f8859d98 | 1871 | int res; |
828716c2 | 1872 | |
828716c2 JS |
1873 | data = simple_transaction_get(file, buf, count); |
1874 | if (IS_ERR(data)) | |
1875 | return PTR_ERR(data); | |
1876 | ||
f7112e6c CS |
1877 | if (format == SMK_FIXED24_FMT) { |
1878 | if (count < SMK_LOADLEN) | |
1879 | return -EINVAL; | |
1880 | res = smk_parse_rule(data, &rule, 0); | |
1881 | } else { | |
1882 | /* | |
10289b0f | 1883 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 1884 | */ |
10289b0f | 1885 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
1886 | } |
1887 | ||
398ce073 JS |
1888 | if (res >= 0) |
1889 | res = smk_access(rule.smk_subject, rule.smk_object, | |
1890 | rule.smk_access1, NULL); | |
1891 | else if (res != -ENOENT) | |
828716c2 JS |
1892 | return -EINVAL; |
1893 | ||
d166c802 CS |
1894 | /* |
1895 | * smk_access() can return a value > 0 in the "bringup" case. | |
1896 | */ | |
1897 | data[0] = res >= 0 ? '1' : '0'; | |
f8859d98 | 1898 | data[1] = '\0'; |
828716c2 | 1899 | |
d86b2b61 | 1900 | simple_transaction_set(file, 2); |
f7112e6c CS |
1901 | |
1902 | if (format == SMK_FIXED24_FMT) | |
1903 | return SMK_LOADLEN; | |
1904 | return count; | |
1905 | } | |
1906 | ||
1907 | /** | |
1908 | * smk_write_access - handle access check transaction | |
1909 | * @file: file pointer | |
1910 | * @buf: data from user space | |
1911 | * @count: bytes sent | |
1912 | * @ppos: where to start - must be 0 | |
1913 | */ | |
1914 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
1915 | size_t count, loff_t *ppos) | |
1916 | { | |
1917 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
1918 | } |
1919 | ||
1920 | static const struct file_operations smk_access_ops = { | |
1921 | .write = smk_write_access, | |
1922 | .read = simple_transaction_read, | |
1923 | .release = simple_transaction_release, | |
1924 | .llseek = generic_file_llseek, | |
1925 | }; | |
1926 | ||
f7112e6c CS |
1927 | |
1928 | /* | |
1929 | * Seq_file read operations for /smack/load2 | |
1930 | */ | |
1931 | ||
1932 | static int load2_seq_show(struct seq_file *s, void *v) | |
1933 | { | |
1934 | struct list_head *list = v; | |
1935 | struct smack_master_list *smlp = | |
1936 | list_entry(list, struct smack_master_list, list); | |
1937 | ||
1938 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
1939 | ||
1940 | return 0; | |
1941 | } | |
1942 | ||
1943 | static const struct seq_operations load2_seq_ops = { | |
1944 | .start = load2_seq_start, | |
1945 | .next = load2_seq_next, | |
1946 | .show = load2_seq_show, | |
1947 | .stop = smk_seq_stop, | |
1948 | }; | |
1949 | ||
1950 | /** | |
1951 | * smk_open_load2 - open() for /smack/load2 | |
1952 | * @inode: inode structure representing file | |
1953 | * @file: "load2" file pointer | |
1954 | * | |
1955 | * For reading, use load2_seq_* seq_file reading operations. | |
1956 | */ | |
1957 | static int smk_open_load2(struct inode *inode, struct file *file) | |
1958 | { | |
1959 | return seq_open(file, &load2_seq_ops); | |
1960 | } | |
1961 | ||
1962 | /** | |
1963 | * smk_write_load2 - write() for /smack/load2 | |
1964 | * @file: file pointer, not actually used | |
1965 | * @buf: where to get the data from | |
1966 | * @count: bytes sent | |
1967 | * @ppos: where to start - must be 0 | |
1968 | * | |
1969 | */ | |
1970 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
1971 | size_t count, loff_t *ppos) | |
1972 | { | |
1973 | /* | |
1974 | * Must have privilege. | |
1975 | */ | |
1880eff7 | 1976 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1977 | return -EPERM; |
1978 | ||
1979 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
1980 | SMK_LONG_FMT); | |
1981 | } | |
1982 | ||
1983 | static const struct file_operations smk_load2_ops = { | |
1984 | .open = smk_open_load2, | |
1985 | .read = seq_read, | |
1986 | .llseek = seq_lseek, | |
1987 | .write = smk_write_load2, | |
1988 | .release = seq_release, | |
1989 | }; | |
1990 | ||
1991 | /* | |
1992 | * Seq_file read operations for /smack/load-self2 | |
1993 | */ | |
1994 | ||
1995 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
1996 | { | |
1997 | struct task_smack *tsp = current_security(); | |
1998 | ||
1999 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
2000 | } | |
2001 | ||
2002 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2003 | { | |
2004 | struct task_smack *tsp = current_security(); | |
2005 | ||
2006 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
2007 | } | |
2008 | ||
2009 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
2010 | { | |
2011 | struct list_head *list = v; | |
2012 | struct smack_rule *srp = | |
2013 | list_entry(list, struct smack_rule, list); | |
2014 | ||
2015 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
2016 | ||
2017 | return 0; | |
2018 | } | |
2019 | ||
2020 | static const struct seq_operations load_self2_seq_ops = { | |
2021 | .start = load_self2_seq_start, | |
2022 | .next = load_self2_seq_next, | |
2023 | .show = load_self2_seq_show, | |
2024 | .stop = smk_seq_stop, | |
2025 | }; | |
2026 | ||
2027 | /** | |
2028 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2029 | * @inode: inode structure representing file | |
2030 | * @file: "load" file pointer | |
2031 | * | |
2032 | * For reading, use load_seq_* seq_file reading operations. | |
2033 | */ | |
2034 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2035 | { | |
2036 | return seq_open(file, &load_self2_seq_ops); | |
2037 | } | |
2038 | ||
2039 | /** | |
2040 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2041 | * @file: file pointer, not actually used | |
2042 | * @buf: where to get the data from | |
2043 | * @count: bytes sent | |
2044 | * @ppos: where to start - must be 0 | |
2045 | * | |
2046 | */ | |
2047 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2048 | size_t count, loff_t *ppos) | |
2049 | { | |
2050 | struct task_smack *tsp = current_security(); | |
2051 | ||
2052 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2053 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2054 | } | |
2055 | ||
2056 | static const struct file_operations smk_load_self2_ops = { | |
2057 | .open = smk_open_load_self2, | |
2058 | .read = seq_read, | |
2059 | .llseek = seq_lseek, | |
2060 | .write = smk_write_load_self2, | |
2061 | .release = seq_release, | |
2062 | }; | |
2063 | ||
2064 | /** | |
2065 | * smk_write_access2 - handle access check transaction | |
2066 | * @file: file pointer | |
2067 | * @buf: data from user space | |
2068 | * @count: bytes sent | |
2069 | * @ppos: where to start - must be 0 | |
2070 | */ | |
2071 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2072 | size_t count, loff_t *ppos) | |
2073 | { | |
2074 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2075 | } | |
2076 | ||
2077 | static const struct file_operations smk_access2_ops = { | |
2078 | .write = smk_write_access2, | |
2079 | .read = simple_transaction_read, | |
2080 | .release = simple_transaction_release, | |
2081 | .llseek = generic_file_llseek, | |
2082 | }; | |
2083 | ||
449543b0 RK |
2084 | /** |
2085 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2086 | * @file: file pointer | |
2087 | * @buf: data from user space | |
2088 | * @count: bytes sent | |
2089 | * @ppos: where to start - must be 0 | |
2090 | */ | |
2091 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2092 | size_t count, loff_t *ppos) | |
2093 | { | |
2094 | char *data = NULL; | |
2095 | const char *cp = NULL; | |
2096 | struct smack_known *skp; | |
2097 | struct smack_rule *sp; | |
2098 | struct list_head *rule_list; | |
2099 | struct mutex *rule_lock; | |
2100 | int rc = count; | |
2101 | ||
2102 | if (*ppos != 0) | |
2103 | return -EINVAL; | |
2104 | ||
2105 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2106 | return -EPERM; | |
2107 | ||
2108 | if (count == 0 || count > SMK_LONGLABEL) | |
2109 | return -EINVAL; | |
2110 | ||
2111 | data = kzalloc(count, GFP_KERNEL); | |
2112 | if (data == NULL) | |
2113 | return -ENOMEM; | |
2114 | ||
2115 | if (copy_from_user(data, buf, count) != 0) { | |
2116 | rc = -EFAULT; | |
2117 | goto free_out; | |
2118 | } | |
2119 | ||
2120 | cp = smk_parse_smack(data, count); | |
2121 | if (cp == NULL) { | |
2122 | rc = -EINVAL; | |
2123 | goto free_out; | |
2124 | } | |
2125 | ||
2126 | skp = smk_find_entry(cp); | |
d15d9fad | 2127 | if (skp == NULL) |
449543b0 | 2128 | goto free_out; |
449543b0 RK |
2129 | |
2130 | rule_list = &skp->smk_rules; | |
2131 | rule_lock = &skp->smk_rules_lock; | |
2132 | ||
2133 | mutex_lock(rule_lock); | |
2134 | ||
2135 | list_for_each_entry_rcu(sp, rule_list, list) | |
2136 | sp->smk_access = 0; | |
2137 | ||
2138 | mutex_unlock(rule_lock); | |
2139 | ||
2140 | free_out: | |
2141 | kfree(data); | |
2142 | kfree(cp); | |
2143 | return rc; | |
2144 | } | |
2145 | ||
2146 | static const struct file_operations smk_revoke_subj_ops = { | |
2147 | .write = smk_write_revoke_subj, | |
2148 | .read = simple_transaction_read, | |
2149 | .release = simple_transaction_release, | |
2150 | .llseek = generic_file_llseek, | |
2151 | }; | |
2152 | ||
e9307237 CS |
2153 | static struct kset *smackfs_kset; |
2154 | /** | |
2155 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2156 | * | |
2157 | */ | |
2158 | static int smk_init_sysfs(void) | |
2159 | { | |
2160 | smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj); | |
2161 | if (!smackfs_kset) | |
2162 | return -ENOMEM; | |
2163 | return 0; | |
2164 | } | |
2165 | ||
e05b6f98 RK |
2166 | /** |
2167 | * smk_write_change_rule - write() for /smack/change-rule | |
2168 | * @file: file pointer | |
2169 | * @buf: data from user space | |
2170 | * @count: bytes sent | |
2171 | * @ppos: where to start - must be 0 | |
2172 | */ | |
2173 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2174 | size_t count, loff_t *ppos) | |
2175 | { | |
2176 | /* | |
2177 | * Must have privilege. | |
2178 | */ | |
4afde48b | 2179 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e05b6f98 RK |
2180 | return -EPERM; |
2181 | ||
2182 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2183 | SMK_CHANGE_FMT); | |
2184 | } | |
2185 | ||
2186 | static const struct file_operations smk_change_rule_ops = { | |
2187 | .write = smk_write_change_rule, | |
2188 | .read = simple_transaction_read, | |
2189 | .release = simple_transaction_release, | |
2190 | .llseek = generic_file_llseek, | |
2191 | }; | |
2192 | ||
e114e473 | 2193 | /** |
00f84f3f CS |
2194 | * smk_read_syslog - read() for smackfs/syslog |
2195 | * @filp: file pointer, not actually used | |
2196 | * @buf: where to put the result | |
2197 | * @cn: maximum to send along | |
2198 | * @ppos: where to start | |
2199 | * | |
2200 | * Returns number of bytes read or error code, as appropriate | |
2201 | */ | |
2202 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, | |
2203 | size_t cn, loff_t *ppos) | |
2204 | { | |
2205 | struct smack_known *skp; | |
2206 | ssize_t rc = -EINVAL; | |
2207 | int asize; | |
2208 | ||
2209 | if (*ppos != 0) | |
2210 | return 0; | |
2211 | ||
2212 | if (smack_syslog_label == NULL) | |
2213 | skp = &smack_known_star; | |
2214 | else | |
2215 | skp = smack_syslog_label; | |
2216 | ||
2217 | asize = strlen(skp->smk_known) + 1; | |
2218 | ||
2219 | if (cn >= asize) | |
2220 | rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, | |
2221 | asize); | |
2222 | ||
2223 | return rc; | |
2224 | } | |
2225 | ||
2226 | /** | |
2227 | * smk_write_syslog - write() for smackfs/syslog | |
2228 | * @file: file pointer, not actually used | |
2229 | * @buf: where to get the data from | |
2230 | * @count: bytes sent | |
2231 | * @ppos: where to start | |
2232 | * | |
2233 | * Returns number of bytes written or error code, as appropriate | |
2234 | */ | |
2235 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, | |
2236 | size_t count, loff_t *ppos) | |
2237 | { | |
2238 | char *data; | |
2239 | struct smack_known *skp; | |
2240 | int rc = count; | |
2241 | ||
2242 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2243 | return -EPERM; | |
2244 | ||
b862e561 | 2245 | data = kzalloc(count + 1, GFP_KERNEL); |
00f84f3f CS |
2246 | if (data == NULL) |
2247 | return -ENOMEM; | |
2248 | ||
2249 | if (copy_from_user(data, buf, count) != 0) | |
2250 | rc = -EFAULT; | |
2251 | else { | |
2252 | skp = smk_import_entry(data, count); | |
2253 | if (skp == NULL) | |
2254 | rc = -EINVAL; | |
2255 | else | |
2256 | smack_syslog_label = smk_import_entry(data, count); | |
2257 | } | |
2258 | ||
2259 | kfree(data); | |
2260 | return rc; | |
2261 | } | |
2262 | ||
2263 | static const struct file_operations smk_syslog_ops = { | |
2264 | .read = smk_read_syslog, | |
2265 | .write = smk_write_syslog, | |
2266 | .llseek = default_llseek, | |
2267 | }; | |
2268 | ||
2269 | ||
66867818 LP |
2270 | /** |
2271 | * smk_read_ptrace - read() for /smack/ptrace | |
2272 | * @filp: file pointer, not actually used | |
2273 | * @buf: where to put the result | |
2274 | * @count: maximum to send along | |
2275 | * @ppos: where to start | |
2276 | * | |
2277 | * Returns number of bytes read or error code, as appropriate | |
2278 | */ | |
2279 | static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, | |
2280 | size_t count, loff_t *ppos) | |
2281 | { | |
2282 | char temp[32]; | |
2283 | ssize_t rc; | |
2284 | ||
2285 | if (*ppos != 0) | |
2286 | return 0; | |
2287 | ||
2288 | sprintf(temp, "%d\n", smack_ptrace_rule); | |
2289 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2290 | return rc; | |
2291 | } | |
2292 | ||
2293 | /** | |
2294 | * smk_write_ptrace - write() for /smack/ptrace | |
2295 | * @file: file pointer | |
2296 | * @buf: data from user space | |
2297 | * @count: bytes sent | |
2298 | * @ppos: where to start - must be 0 | |
2299 | */ | |
2300 | static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, | |
2301 | size_t count, loff_t *ppos) | |
2302 | { | |
2303 | char temp[32]; | |
2304 | int i; | |
2305 | ||
2306 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2307 | return -EPERM; | |
2308 | ||
2309 | if (*ppos != 0 || count >= sizeof(temp) || count == 0) | |
2310 | return -EINVAL; | |
2311 | ||
2312 | if (copy_from_user(temp, buf, count) != 0) | |
2313 | return -EFAULT; | |
2314 | ||
2315 | temp[count] = '\0'; | |
2316 | ||
2317 | if (sscanf(temp, "%d", &i) != 1) | |
2318 | return -EINVAL; | |
2319 | if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) | |
2320 | return -EINVAL; | |
2321 | smack_ptrace_rule = i; | |
2322 | ||
2323 | return count; | |
2324 | } | |
2325 | ||
2326 | static const struct file_operations smk_ptrace_ops = { | |
2327 | .write = smk_write_ptrace, | |
2328 | .read = smk_read_ptrace, | |
2329 | .llseek = default_llseek, | |
2330 | }; | |
2331 | ||
00f84f3f CS |
2332 | /** |
2333 | * smk_fill_super - fill the smackfs superblock | |
e114e473 CS |
2334 | * @sb: the empty superblock |
2335 | * @data: unused | |
2336 | * @silent: unused | |
2337 | * | |
00f84f3f | 2338 | * Fill in the well known entries for the smack filesystem |
e114e473 CS |
2339 | * |
2340 | * Returns 0 on success, an error code on failure | |
2341 | */ | |
2342 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2343 | { | |
2344 | int rc; | |
2345 | struct inode *root_inode; | |
2346 | ||
2347 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
2348 | [SMK_LOAD] = { |
2349 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2350 | [SMK_CIPSO] = { | |
2351 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2352 | [SMK_DOI] = { | |
2353 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2354 | [SMK_DIRECT] = { | |
2355 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2356 | [SMK_AMBIENT] = { | |
2357 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
2358 | [SMK_NETLBLADDR] = { | |
2359 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
2360 | [SMK_ONLYCAP] = { | |
2361 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2362 | [SMK_LOGGING] = { | |
2363 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2364 | [SMK_LOAD_SELF] = { | |
2365 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2366 | [SMK_ACCESSES] = { |
0e94ae17 | 2367 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2368 | [SMK_MAPPED] = { |
2369 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2370 | [SMK_LOAD2] = { | |
2371 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2372 | [SMK_LOAD_SELF2] = { | |
2373 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2374 | [SMK_ACCESS2] = { | |
2375 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2376 | [SMK_CIPSO2] = { | |
2377 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2378 | [SMK_REVOKE_SUBJ] = { |
2379 | "revoke-subject", &smk_revoke_subj_ops, | |
2380 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2381 | [SMK_CHANGE_RULE] = { |
2382 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
00f84f3f CS |
2383 | [SMK_SYSLOG] = { |
2384 | "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, | |
66867818 LP |
2385 | [SMK_PTRACE] = { |
2386 | "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2387 | /* last one */ |
2388 | {""} | |
e114e473 CS |
2389 | }; |
2390 | ||
2391 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2392 | if (rc != 0) { | |
2393 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2394 | __func__, rc); | |
2395 | return rc; | |
2396 | } | |
2397 | ||
2398 | root_inode = sb->s_root->d_inode; | |
e114e473 CS |
2399 | |
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | /** | |
fc14f2fe | 2404 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2405 | * @fs_type: passed along without comment |
2406 | * @flags: passed along without comment | |
2407 | * @dev_name: passed along without comment | |
2408 | * @data: passed along without comment | |
e114e473 CS |
2409 | * |
2410 | * Just passes everything along. | |
2411 | * | |
2412 | * Returns what the lower level code does. | |
2413 | */ | |
fc14f2fe AV |
2414 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2415 | int flags, const char *dev_name, void *data) | |
e114e473 | 2416 | { |
fc14f2fe | 2417 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2418 | } |
2419 | ||
2420 | static struct file_system_type smk_fs_type = { | |
2421 | .name = "smackfs", | |
fc14f2fe | 2422 | .mount = smk_mount, |
e114e473 CS |
2423 | .kill_sb = kill_litter_super, |
2424 | }; | |
2425 | ||
2426 | static struct vfsmount *smackfs_mount; | |
2427 | ||
f7112e6c CS |
2428 | static int __init smk_preset_netlabel(struct smack_known *skp) |
2429 | { | |
2430 | skp->smk_netlabel.domain = skp->smk_known; | |
2431 | skp->smk_netlabel.flags = | |
2432 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
2433 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
2434 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
2435 | } | |
2436 | ||
e114e473 CS |
2437 | /** |
2438 | * init_smk_fs - get the smackfs superblock | |
2439 | * | |
2440 | * register the smackfs | |
2441 | * | |
076c54c5 AD |
2442 | * Do not register smackfs if Smack wasn't enabled |
2443 | * on boot. We can not put this method normally under the | |
2444 | * smack_init() code path since the security subsystem get | |
2445 | * initialized before the vfs caches. | |
2446 | * | |
2447 | * Returns true if we were not chosen on boot or if | |
2448 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2449 | */ |
2450 | static int __init init_smk_fs(void) | |
2451 | { | |
2452 | int err; | |
f7112e6c | 2453 | int rc; |
e114e473 | 2454 | |
076c54c5 AD |
2455 | if (!security_module_enable(&smack_ops)) |
2456 | return 0; | |
2457 | ||
e9307237 CS |
2458 | err = smk_init_sysfs(); |
2459 | if (err) | |
2460 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
2461 | ||
e114e473 CS |
2462 | err = register_filesystem(&smk_fs_type); |
2463 | if (!err) { | |
2464 | smackfs_mount = kern_mount(&smk_fs_type); | |
2465 | if (IS_ERR(smackfs_mount)) { | |
2466 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
2467 | err = PTR_ERR(smackfs_mount); | |
2468 | smackfs_mount = NULL; | |
2469 | } | |
2470 | } | |
2471 | ||
e114e473 | 2472 | smk_cipso_doi(); |
4bc87e62 | 2473 | smk_unlbl_ambient(NULL); |
e114e473 | 2474 | |
f7112e6c CS |
2475 | rc = smk_preset_netlabel(&smack_known_floor); |
2476 | if (err == 0 && rc < 0) | |
2477 | err = rc; | |
2478 | rc = smk_preset_netlabel(&smack_known_hat); | |
2479 | if (err == 0 && rc < 0) | |
2480 | err = rc; | |
2481 | rc = smk_preset_netlabel(&smack_known_huh); | |
2482 | if (err == 0 && rc < 0) | |
2483 | err = rc; | |
2484 | rc = smk_preset_netlabel(&smack_known_invalid); | |
2485 | if (err == 0 && rc < 0) | |
2486 | err = rc; | |
2487 | rc = smk_preset_netlabel(&smack_known_star); | |
2488 | if (err == 0 && rc < 0) | |
2489 | err = rc; | |
2490 | rc = smk_preset_netlabel(&smack_known_web); | |
2491 | if (err == 0 && rc < 0) | |
2492 | err = rc; | |
2493 | ||
e114e473 CS |
2494 | return err; |
2495 | } | |
2496 | ||
2497 | __initcall(init_smk_fs); |