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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 | ||
21abb1ec | 32 | #define BEBITS (sizeof(__be32) * 8) |
e114e473 CS |
33 | /* |
34 | * smackfs pseudo filesystem. | |
35 | */ | |
36 | ||
37 | enum smk_inos { | |
38 | SMK_ROOT_INO = 2, | |
39 | SMK_LOAD = 3, /* load policy */ | |
40 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
41 | SMK_DOI = 5, /* CIPSO DOI */ | |
42 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
43 | SMK_AMBIENT = 7, /* internet ambient label */ | |
21abb1ec | 44 | SMK_NET4ADDR = 8, /* single label hosts */ |
15446235 | 45 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
ecfcc53f | 46 | SMK_LOGGING = 10, /* logging */ |
7898e1f8 | 47 | SMK_LOAD_SELF = 11, /* task specific rules */ |
828716c2 | 48 | SMK_ACCESSES = 12, /* access policy */ |
f7112e6c CS |
49 | SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ |
50 | SMK_LOAD2 = 14, /* load policy with long labels */ | |
51 | SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ | |
52 | SMK_ACCESS2 = 16, /* make an access check with long labels */ | |
53 | SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ | |
449543b0 | 54 | SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ |
e05b6f98 | 55 | SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ |
00f84f3f | 56 | SMK_SYSLOG = 20, /* change syslog label) */ |
66867818 | 57 | SMK_PTRACE = 21, /* set ptrace rule */ |
bf4b2fee CS |
58 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
59 | SMK_UNCONFINED = 22, /* define an unconfined label */ | |
60 | #endif | |
21abb1ec CS |
61 | #if IS_ENABLED(CONFIG_IPV6) |
62 | SMK_NET6ADDR = 23, /* single label IPv6 hosts */ | |
63 | #endif /* CONFIG_IPV6 */ | |
e114e473 CS |
64 | }; |
65 | ||
66 | /* | |
67 | * List locks | |
68 | */ | |
e114e473 | 69 | static DEFINE_MUTEX(smack_cipso_lock); |
4bc87e62 | 70 | static DEFINE_MUTEX(smack_ambient_lock); |
21abb1ec CS |
71 | static DEFINE_MUTEX(smk_net4addr_lock); |
72 | #if IS_ENABLED(CONFIG_IPV6) | |
73 | static DEFINE_MUTEX(smk_net6addr_lock); | |
74 | #endif /* CONFIG_IPV6 */ | |
e114e473 CS |
75 | |
76 | /* | |
77 | * This is the "ambient" label for network traffic. | |
78 | * If it isn't somehow marked, use this. | |
79 | * It can be reset via smackfs/ambient | |
80 | */ | |
2f823ff8 | 81 | struct smack_known *smack_net_ambient; |
e114e473 | 82 | |
e114e473 CS |
83 | /* |
84 | * This is the level in a CIPSO header that indicates a | |
85 | * smack label is contained directly in the category set. | |
86 | * It can be reset via smackfs/direct | |
87 | */ | |
88 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
89 | ||
f7112e6c CS |
90 | /* |
91 | * This is the level in a CIPSO header that indicates a | |
92 | * secid is contained directly in the category set. | |
93 | * It can be reset via smackfs/mapped | |
94 | */ | |
95 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; | |
96 | ||
bf4b2fee CS |
97 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
98 | /* | |
99 | * Allow one label to be unconfined. This is for | |
100 | * debugging and application bring-up purposes only. | |
101 | * It is bad and wrong, but everyone seems to expect | |
102 | * to have it. | |
103 | */ | |
104 | struct smack_known *smack_unconfined; | |
105 | #endif | |
106 | ||
00f84f3f CS |
107 | /* |
108 | * If this value is set restrict syslog use to the label specified. | |
109 | * It can be reset via smackfs/syslog | |
110 | */ | |
111 | struct smack_known *smack_syslog_label; | |
15446235 | 112 | |
66867818 LP |
113 | /* |
114 | * Ptrace current rule | |
115 | * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) | |
116 | * SMACK_PTRACE_EXACT labels must match, but can be overriden with | |
117 | * CAP_SYS_PTRACE | |
118 | * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect | |
119 | */ | |
120 | int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; | |
121 | ||
6d3dc07c CS |
122 | /* |
123 | * Certain IP addresses may be designated as single label hosts. | |
124 | * Packets are sent there unlabeled, but only from tasks that | |
125 | * can write to the specified label. | |
126 | */ | |
7198e2ee | 127 | |
21abb1ec CS |
128 | LIST_HEAD(smk_net4addr_list); |
129 | #if IS_ENABLED(CONFIG_IPV6) | |
130 | LIST_HEAD(smk_net6addr_list); | |
131 | #endif /* CONFIG_IPV6 */ | |
272cd7a8 CS |
132 | |
133 | /* | |
134 | * Rule lists are maintained for each label. | |
f7112e6c | 135 | * This master list is just for reading /smack/load and /smack/load2. |
272cd7a8 CS |
136 | */ |
137 | struct smack_master_list { | |
138 | struct list_head list; | |
139 | struct smack_rule *smk_rule; | |
140 | }; | |
141 | ||
1eddfe8e | 142 | static LIST_HEAD(smack_rule_list); |
6d3dc07c | 143 | |
e05b6f98 | 144 | struct smack_parsed_rule { |
2f823ff8 | 145 | struct smack_known *smk_subject; |
21c7eae2 | 146 | struct smack_known *smk_object; |
e05b6f98 RK |
147 | int smk_access1; |
148 | int smk_access2; | |
149 | }; | |
150 | ||
e114e473 | 151 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 152 | |
e114e473 CS |
153 | /* |
154 | * Values for parsing cipso rules | |
155 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
156 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
157 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
158 | */ |
159 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
160 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
161 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
162 | ||
163 | /* | |
164 | * Values for parsing MAC rules | |
165 | * SMK_ACCESS: Maximum possible combination of access permissions | |
166 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
167 | * SMK_LOADLEN: Smack rule length | |
168 | */ | |
5c6d1125 | 169 | #define SMK_OACCESS "rwxa" |
c0ab6e56 | 170 | #define SMK_ACCESS "rwxatl" |
5c6d1125 JS |
171 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
172 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
173 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
174 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 175 | |
f7112e6c CS |
176 | /* |
177 | * Stricly for CIPSO level manipulation. | |
178 | * Set the category bit number in a smack label sized buffer. | |
179 | */ | |
180 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) | |
181 | { | |
182 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) | |
183 | return; | |
184 | ||
185 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
186 | } | |
187 | ||
6d3dc07c CS |
188 | /** |
189 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
190 | * @nap: structure to fill | |
191 | */ | |
192 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
193 | { | |
2f823ff8 CS |
194 | struct smack_known *skp = smk_of_current(); |
195 | ||
6d3dc07c CS |
196 | nap->loginuid = audit_get_loginuid(current); |
197 | nap->sessionid = audit_get_sessionid(current); | |
2f823ff8 | 198 | nap->secid = skp->smk_secid; |
6d3dc07c CS |
199 | } |
200 | ||
201 | /* | |
f7112e6c | 202 | * Value for parsing single label host rules |
6d3dc07c | 203 | * "1.2.3.4 X" |
6d3dc07c CS |
204 | */ |
205 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 206 | |
e114e473 | 207 | /** |
e05b6f98 RK |
208 | * smk_set_access - add a rule to the rule list or replace an old rule |
209 | * @srp: the rule to add or replace | |
7898e1f8 CS |
210 | * @rule_list: the list of rules |
211 | * @rule_lock: the rule list lock | |
e05b6f98 | 212 | * @global: if non-zero, indicates a global rule |
e114e473 CS |
213 | * |
214 | * Looks through the current subject/object/access list for | |
215 | * the subject/object pair and replaces the access that was | |
216 | * there. If the pair isn't found add it with the specified | |
217 | * access. | |
81ea714b SL |
218 | * |
219 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
220 | * during the allocation of the new pair to add. | |
e114e473 | 221 | */ |
e05b6f98 RK |
222 | static int smk_set_access(struct smack_parsed_rule *srp, |
223 | struct list_head *rule_list, | |
224 | struct mutex *rule_lock, int global) | |
e114e473 | 225 | { |
7198e2ee | 226 | struct smack_rule *sp; |
e05b6f98 | 227 | struct smack_master_list *smlp; |
7898e1f8 | 228 | int found = 0; |
e05b6f98 | 229 | int rc = 0; |
e114e473 | 230 | |
7898e1f8 CS |
231 | mutex_lock(rule_lock); |
232 | ||
272cd7a8 CS |
233 | /* |
234 | * Because the object label is less likely to match | |
235 | * than the subject label check it first | |
236 | */ | |
7898e1f8 | 237 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
238 | if (sp->smk_object == srp->smk_object && |
239 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee | 240 | found = 1; |
e05b6f98 RK |
241 | sp->smk_access |= srp->smk_access1; |
242 | sp->smk_access &= ~srp->smk_access2; | |
e114e473 CS |
243 | break; |
244 | } | |
e114e473 CS |
245 | } |
246 | ||
e05b6f98 RK |
247 | if (found == 0) { |
248 | sp = kzalloc(sizeof(*sp), GFP_KERNEL); | |
249 | if (sp == NULL) { | |
250 | rc = -ENOMEM; | |
251 | goto out; | |
252 | } | |
253 | ||
254 | sp->smk_subject = srp->smk_subject; | |
255 | sp->smk_object = srp->smk_object; | |
256 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; | |
257 | ||
258 | list_add_rcu(&sp->list, rule_list); | |
259 | /* | |
260 | * If this is a global as opposed to self and a new rule | |
261 | * it needs to get added for reporting. | |
262 | */ | |
263 | if (global) { | |
264 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
265 | if (smlp != NULL) { | |
266 | smlp->smk_rule = sp; | |
267 | list_add_rcu(&smlp->list, &smack_rule_list); | |
268 | } else | |
269 | rc = -ENOMEM; | |
270 | } | |
271 | } | |
272 | ||
273 | out: | |
7898e1f8 | 274 | mutex_unlock(rule_lock); |
e05b6f98 RK |
275 | return rc; |
276 | } | |
277 | ||
278 | /** | |
279 | * smk_perm_from_str - parse smack accesses from a text string | |
280 | * @string: a text string that contains a Smack accesses code | |
281 | * | |
282 | * Returns an integer with respective bits set for specified accesses. | |
283 | */ | |
284 | static int smk_perm_from_str(const char *string) | |
285 | { | |
286 | int perm = 0; | |
287 | const char *cp; | |
e114e473 | 288 | |
e05b6f98 RK |
289 | for (cp = string; ; cp++) |
290 | switch (*cp) { | |
291 | case '-': | |
292 | break; | |
293 | case 'r': | |
294 | case 'R': | |
295 | perm |= MAY_READ; | |
296 | break; | |
297 | case 'w': | |
298 | case 'W': | |
299 | perm |= MAY_WRITE; | |
300 | break; | |
301 | case 'x': | |
302 | case 'X': | |
303 | perm |= MAY_EXEC; | |
304 | break; | |
305 | case 'a': | |
306 | case 'A': | |
307 | perm |= MAY_APPEND; | |
308 | break; | |
309 | case 't': | |
310 | case 'T': | |
311 | perm |= MAY_TRANSMUTE; | |
312 | break; | |
c0ab6e56 CS |
313 | case 'l': |
314 | case 'L': | |
315 | perm |= MAY_LOCK; | |
316 | break; | |
d166c802 CS |
317 | case 'b': |
318 | case 'B': | |
319 | perm |= MAY_BRINGUP; | |
320 | break; | |
e05b6f98 RK |
321 | default: |
322 | return perm; | |
323 | } | |
e114e473 CS |
324 | } |
325 | ||
326 | /** | |
f7112e6c CS |
327 | * smk_fill_rule - Fill Smack rule from strings |
328 | * @subject: subject label string | |
329 | * @object: object label string | |
e05b6f98 RK |
330 | * @access1: access string |
331 | * @access2: string with permissions to be removed | |
0e94ae17 JS |
332 | * @rule: Smack rule |
333 | * @import: if non-zero, import labels | |
3518721a | 334 | * @len: label length limit |
f7112e6c | 335 | * |
e774ad68 | 336 | * Returns 0 on success, appropriate error code on failure. |
e114e473 | 337 | */ |
f7112e6c | 338 | static int smk_fill_rule(const char *subject, const char *object, |
e05b6f98 RK |
339 | const char *access1, const char *access2, |
340 | struct smack_parsed_rule *rule, int import, | |
341 | int len) | |
e114e473 | 342 | { |
f7112e6c | 343 | const char *cp; |
0e94ae17 | 344 | struct smack_known *skp; |
e114e473 | 345 | |
0e94ae17 | 346 | if (import) { |
2f823ff8 | 347 | rule->smk_subject = smk_import_entry(subject, len); |
e774ad68 LP |
348 | if (IS_ERR(rule->smk_subject)) |
349 | return PTR_ERR(rule->smk_subject); | |
0e94ae17 | 350 | |
21c7eae2 | 351 | rule->smk_object = smk_import_entry(object, len); |
e774ad68 LP |
352 | if (IS_ERR(rule->smk_object)) |
353 | return PTR_ERR(rule->smk_object); | |
0e94ae17 | 354 | } else { |
3518721a | 355 | cp = smk_parse_smack(subject, len); |
e774ad68 LP |
356 | if (IS_ERR(cp)) |
357 | return PTR_ERR(cp); | |
f7112e6c CS |
358 | skp = smk_find_entry(cp); |
359 | kfree(cp); | |
0e94ae17 | 360 | if (skp == NULL) |
398ce073 | 361 | return -ENOENT; |
2f823ff8 | 362 | rule->smk_subject = skp; |
0e94ae17 | 363 | |
3518721a | 364 | cp = smk_parse_smack(object, len); |
e774ad68 LP |
365 | if (IS_ERR(cp)) |
366 | return PTR_ERR(cp); | |
f7112e6c CS |
367 | skp = smk_find_entry(cp); |
368 | kfree(cp); | |
0e94ae17 | 369 | if (skp == NULL) |
398ce073 | 370 | return -ENOENT; |
21c7eae2 | 371 | rule->smk_object = skp; |
0e94ae17 | 372 | } |
7198e2ee | 373 | |
e05b6f98 RK |
374 | rule->smk_access1 = smk_perm_from_str(access1); |
375 | if (access2) | |
376 | rule->smk_access2 = smk_perm_from_str(access2); | |
377 | else | |
378 | rule->smk_access2 = ~rule->smk_access1; | |
e114e473 | 379 | |
3518721a | 380 | return 0; |
f7112e6c | 381 | } |
e114e473 | 382 | |
f7112e6c CS |
383 | /** |
384 | * smk_parse_rule - parse Smack rule from load string | |
385 | * @data: string to be parsed whose size is SMK_LOADLEN | |
386 | * @rule: Smack rule | |
387 | * @import: if non-zero, import labels | |
388 | * | |
389 | * Returns 0 on success, -1 on errors. | |
390 | */ | |
e05b6f98 RK |
391 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
392 | int import) | |
f7112e6c CS |
393 | { |
394 | int rc; | |
e114e473 | 395 | |
f7112e6c | 396 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
e05b6f98 RK |
397 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
398 | import, SMK_LABELLEN); | |
f7112e6c CS |
399 | return rc; |
400 | } | |
e114e473 | 401 | |
f7112e6c CS |
402 | /** |
403 | * smk_parse_long_rule - parse Smack rule from rule string | |
404 | * @data: string to be parsed, null terminated | |
e05b6f98 | 405 | * @rule: Will be filled with Smack parsed rule |
f7112e6c | 406 | * @import: if non-zero, import labels |
10289b0f | 407 | * @tokens: numer of substrings expected in data |
f7112e6c | 408 | * |
e774ad68 | 409 | * Returns number of processed bytes on success, -ERRNO on failure. |
f7112e6c | 410 | */ |
10289b0f RK |
411 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
412 | int import, int tokens) | |
f7112e6c | 413 | { |
10289b0f RK |
414 | ssize_t cnt = 0; |
415 | char *tok[4]; | |
398ce073 | 416 | int rc; |
10289b0f RK |
417 | int i; |
418 | ||
419 | /* | |
420 | * Parsing the rule in-place, filling all white-spaces with '\0' | |
421 | */ | |
422 | for (i = 0; i < tokens; ++i) { | |
423 | while (isspace(data[cnt])) | |
424 | data[cnt++] = '\0'; | |
425 | ||
426 | if (data[cnt] == '\0') | |
427 | /* Unexpected end of data */ | |
e774ad68 | 428 | return -EINVAL; |
10289b0f RK |
429 | |
430 | tok[i] = data + cnt; | |
431 | ||
432 | while (data[cnt] && !isspace(data[cnt])) | |
433 | ++cnt; | |
e05b6f98 | 434 | } |
10289b0f RK |
435 | while (isspace(data[cnt])) |
436 | data[cnt++] = '\0'; | |
f7112e6c | 437 | |
10289b0f RK |
438 | while (i < 4) |
439 | tok[i++] = NULL; | |
440 | ||
398ce073 JS |
441 | rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
442 | return rc == 0 ? cnt : rc; | |
828716c2 JS |
443 | } |
444 | ||
f7112e6c CS |
445 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
446 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
e05b6f98 | 447 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
828716c2 | 448 | /** |
f7112e6c | 449 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
450 | * @file: file pointer, not actually used |
451 | * @buf: where to get the data from | |
452 | * @count: bytes sent | |
453 | * @ppos: where to start - must be 0 | |
454 | * @rule_list: the list of rules to write to | |
455 | * @rule_lock: lock for the rule list | |
e05b6f98 | 456 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 JS |
457 | * |
458 | * Get one smack access rule from above. | |
f7112e6c CS |
459 | * The format for SMK_LONG_FMT is: |
460 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
461 | * The format for SMK_FIXED24_FMT is exactly: | |
462 | * "subject object rwxat" | |
e05b6f98 RK |
463 | * The format for SMK_CHANGE_FMT is: |
464 | * "subject<whitespace>object<whitespace> | |
465 | * acc_enable<whitespace>acc_disable[<whitespace>...]" | |
828716c2 | 466 | */ |
f7112e6c CS |
467 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
468 | size_t count, loff_t *ppos, | |
469 | struct list_head *rule_list, | |
470 | struct mutex *rule_lock, int format) | |
828716c2 | 471 | { |
470043ba | 472 | struct smack_parsed_rule rule; |
828716c2 | 473 | char *data; |
10289b0f RK |
474 | int rc; |
475 | int trunc = 0; | |
476 | int tokens; | |
477 | ssize_t cnt = 0; | |
828716c2 JS |
478 | |
479 | /* | |
480 | * No partial writes. | |
481 | * Enough data must be present. | |
482 | */ | |
483 | if (*ppos != 0) | |
484 | return -EINVAL; | |
828716c2 | 485 | |
f7112e6c CS |
486 | if (format == SMK_FIXED24_FMT) { |
487 | /* | |
488 | * Minor hack for backward compatibility | |
489 | */ | |
c0ab6e56 | 490 | if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
f7112e6c | 491 | return -EINVAL; |
10289b0f RK |
492 | } else { |
493 | if (count >= PAGE_SIZE) { | |
494 | count = PAGE_SIZE - 1; | |
495 | trunc = 1; | |
496 | } | |
497 | } | |
f7112e6c | 498 | |
10289b0f | 499 | data = kmalloc(count + 1, GFP_KERNEL); |
828716c2 JS |
500 | if (data == NULL) |
501 | return -ENOMEM; | |
502 | ||
503 | if (copy_from_user(data, buf, count) != 0) { | |
504 | rc = -EFAULT; | |
505 | goto out; | |
506 | } | |
507 | ||
10289b0f RK |
508 | /* |
509 | * In case of parsing only part of user buf, | |
510 | * avoid having partial rule at the data buffer | |
511 | */ | |
512 | if (trunc) { | |
513 | while (count > 0 && (data[count - 1] != '\n')) | |
514 | --count; | |
515 | if (count == 0) { | |
516 | rc = -EINVAL; | |
470043ba | 517 | goto out; |
10289b0f | 518 | } |
f7112e6c CS |
519 | } |
520 | ||
10289b0f RK |
521 | data[count] = '\0'; |
522 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); | |
523 | while (cnt < count) { | |
524 | if (format == SMK_FIXED24_FMT) { | |
525 | rc = smk_parse_rule(data, &rule, 1); | |
e774ad68 | 526 | if (rc < 0) |
10289b0f | 527 | goto out; |
10289b0f RK |
528 | cnt = count; |
529 | } else { | |
530 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); | |
e774ad68 LP |
531 | if (rc < 0) |
532 | goto out; | |
533 | if (rc == 0) { | |
10289b0f RK |
534 | rc = -EINVAL; |
535 | goto out; | |
536 | } | |
537 | cnt += rc; | |
538 | } | |
539 | ||
540 | if (rule_list == NULL) | |
541 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, | |
542 | &rule.smk_subject->smk_rules_lock, 1); | |
543 | else | |
544 | rc = smk_set_access(&rule, rule_list, rule_lock, 0); | |
545 | ||
546 | if (rc) | |
547 | goto out; | |
272cd7a8 CS |
548 | } |
549 | ||
10289b0f | 550 | rc = cnt; |
e114e473 CS |
551 | out: |
552 | kfree(data); | |
553 | return rc; | |
554 | } | |
555 | ||
7898e1f8 | 556 | /* |
40809565 | 557 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
558 | */ |
559 | ||
40809565 CS |
560 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
561 | struct list_head *head) | |
7898e1f8 | 562 | { |
272cd7a8 | 563 | struct list_head *list; |
01fa8474 RK |
564 | int i = *pos; |
565 | ||
566 | rcu_read_lock(); | |
567 | for (list = rcu_dereference(list_next_rcu(head)); | |
568 | list != head; | |
569 | list = rcu_dereference(list_next_rcu(list))) { | |
570 | if (i-- == 0) | |
571 | return list; | |
572 | } | |
272cd7a8 | 573 | |
01fa8474 | 574 | return NULL; |
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 | ||
01fa8474 RK |
582 | ++*pos; |
583 | list = rcu_dereference(list_next_rcu(list)); | |
584 | ||
585 | return (list == head) ? NULL : list; | |
7898e1f8 CS |
586 | } |
587 | ||
40809565 CS |
588 | static void smk_seq_stop(struct seq_file *s, void *v) |
589 | { | |
01fa8474 | 590 | rcu_read_unlock(); |
40809565 CS |
591 | } |
592 | ||
f7112e6c | 593 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 594 | { |
f7112e6c CS |
595 | /* |
596 | * Don't show any rules with label names too long for | |
597 | * interface file (/smack/load or /smack/load2) | |
598 | * because you should expect to be able to write | |
599 | * anything you read back. | |
600 | */ | |
2f823ff8 | 601 | if (strlen(srp->smk_subject->smk_known) >= max || |
21c7eae2 | 602 | strlen(srp->smk_object->smk_known) >= max) |
f7112e6c | 603 | return; |
7898e1f8 | 604 | |
65ee7f45 RK |
605 | if (srp->smk_access == 0) |
606 | return; | |
607 | ||
21c7eae2 LP |
608 | seq_printf(s, "%s %s", |
609 | srp->smk_subject->smk_known, | |
610 | srp->smk_object->smk_known); | |
7898e1f8 CS |
611 | |
612 | seq_putc(s, ' '); | |
613 | ||
614 | if (srp->smk_access & MAY_READ) | |
615 | seq_putc(s, 'r'); | |
616 | if (srp->smk_access & MAY_WRITE) | |
617 | seq_putc(s, 'w'); | |
618 | if (srp->smk_access & MAY_EXEC) | |
619 | seq_putc(s, 'x'); | |
620 | if (srp->smk_access & MAY_APPEND) | |
621 | seq_putc(s, 'a'); | |
622 | if (srp->smk_access & MAY_TRANSMUTE) | |
623 | seq_putc(s, 't'); | |
c0ab6e56 CS |
624 | if (srp->smk_access & MAY_LOCK) |
625 | seq_putc(s, 'l'); | |
d166c802 CS |
626 | if (srp->smk_access & MAY_BRINGUP) |
627 | seq_putc(s, 'b'); | |
7898e1f8 CS |
628 | |
629 | seq_putc(s, '\n'); | |
f7112e6c CS |
630 | } |
631 | ||
632 | /* | |
633 | * Seq_file read operations for /smack/load | |
634 | */ | |
635 | ||
636 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
637 | { | |
638 | return smk_seq_start(s, pos, &smack_rule_list); | |
639 | } | |
640 | ||
641 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
642 | { | |
643 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
644 | } | |
645 | ||
646 | static int load_seq_show(struct seq_file *s, void *v) | |
647 | { | |
648 | struct list_head *list = v; | |
649 | struct smack_master_list *smlp = | |
01fa8474 | 650 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
651 | |
652 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
653 | |
654 | return 0; | |
655 | } | |
656 | ||
7898e1f8 | 657 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
658 | .start = load2_seq_start, |
659 | .next = load2_seq_next, | |
7898e1f8 | 660 | .show = load_seq_show, |
40809565 | 661 | .stop = smk_seq_stop, |
7898e1f8 CS |
662 | }; |
663 | ||
664 | /** | |
665 | * smk_open_load - open() for /smack/load | |
666 | * @inode: inode structure representing file | |
667 | * @file: "load" file pointer | |
668 | * | |
669 | * For reading, use load_seq_* seq_file reading operations. | |
670 | */ | |
671 | static int smk_open_load(struct inode *inode, struct file *file) | |
672 | { | |
673 | return seq_open(file, &load_seq_ops); | |
674 | } | |
675 | ||
676 | /** | |
677 | * smk_write_load - write() for /smack/load | |
678 | * @file: file pointer, not actually used | |
679 | * @buf: where to get the data from | |
680 | * @count: bytes sent | |
681 | * @ppos: where to start - must be 0 | |
682 | * | |
683 | */ | |
684 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
685 | size_t count, loff_t *ppos) | |
686 | { | |
7898e1f8 CS |
687 | /* |
688 | * Must have privilege. | |
689 | * No partial writes. | |
690 | * Enough data must be present. | |
691 | */ | |
1880eff7 | 692 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
693 | return -EPERM; |
694 | ||
f7112e6c CS |
695 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
696 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
697 | } |
698 | ||
e114e473 CS |
699 | static const struct file_operations smk_load_ops = { |
700 | .open = smk_open_load, | |
701 | .read = seq_read, | |
702 | .llseek = seq_lseek, | |
703 | .write = smk_write_load, | |
cb622bbb | 704 | .release = seq_release, |
e114e473 CS |
705 | }; |
706 | ||
707 | /** | |
708 | * smk_cipso_doi - initialize the CIPSO domain | |
709 | */ | |
30aa4faf | 710 | static void smk_cipso_doi(void) |
e114e473 CS |
711 | { |
712 | int rc; | |
713 | struct cipso_v4_doi *doip; | |
6d3dc07c | 714 | struct netlbl_audit nai; |
e114e473 | 715 | |
6d3dc07c | 716 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 717 | |
6d3dc07c | 718 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
719 | if (rc != 0) |
720 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
721 | __func__, __LINE__, rc); | |
722 | ||
723 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
724 | if (doip == NULL) | |
725 | panic("smack: Failed to initialize cipso DOI.\n"); | |
726 | doip->map.std = NULL; | |
727 | doip->doi = smk_cipso_doi_value; | |
728 | doip->type = CIPSO_V4_MAP_PASS; | |
729 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
730 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
731 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
732 | ||
6d3dc07c | 733 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 734 | if (rc != 0) { |
6c2e8ac0 PM |
735 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
736 | __func__, __LINE__, rc); | |
737 | kfree(doip); | |
738 | return; | |
739 | } | |
6d3dc07c | 740 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
741 | if (rc != 0) { |
742 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 743 | __func__, __LINE__, rc); |
b1edeb10 | 744 | kfree(doip); |
6c2e8ac0 | 745 | return; |
b1edeb10 | 746 | } |
e114e473 CS |
747 | } |
748 | ||
4bc87e62 CS |
749 | /** |
750 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 751 | * @oldambient: previous domain string |
4bc87e62 | 752 | */ |
30aa4faf | 753 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
754 | { |
755 | int rc; | |
6d3dc07c | 756 | struct netlbl_audit nai; |
4bc87e62 | 757 | |
6d3dc07c | 758 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
759 | |
760 | if (oldambient != NULL) { | |
6d3dc07c | 761 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
762 | if (rc != 0) |
763 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
764 | __func__, __LINE__, rc); | |
765 | } | |
f7112e6c | 766 | if (smack_net_ambient == NULL) |
2f823ff8 | 767 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 768 | |
2f823ff8 | 769 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 770 | NULL, NULL, &nai); |
4bc87e62 CS |
771 | if (rc != 0) |
772 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
773 | __func__, __LINE__, rc); | |
774 | } | |
775 | ||
e114e473 CS |
776 | /* |
777 | * Seq_file read operations for /smack/cipso | |
778 | */ | |
779 | ||
780 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
781 | { | |
40809565 | 782 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
783 | } |
784 | ||
785 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
786 | { | |
40809565 | 787 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
788 | } |
789 | ||
790 | /* | |
791 | * Print cipso labels in format: | |
792 | * label level[/cat[,cat]] | |
793 | */ | |
794 | static int cipso_seq_show(struct seq_file *s, void *v) | |
795 | { | |
7198e2ee EB |
796 | struct list_head *list = v; |
797 | struct smack_known *skp = | |
01fa8474 | 798 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 799 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 800 | char sep = '/'; |
e114e473 | 801 | int i; |
e114e473 | 802 | |
f7112e6c CS |
803 | /* |
804 | * Don't show a label that could not have been set using | |
805 | * /smack/cipso. This is in support of the notion that | |
806 | * anything read from /smack/cipso ought to be writeable | |
807 | * to /smack/cipso. | |
808 | * | |
809 | * /smack/cipso2 should be used instead. | |
810 | */ | |
811 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
812 | return 0; |
813 | ||
f7112e6c | 814 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 815 | |
4fbe63d1 PM |
816 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
817 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
818 | seq_printf(s, "%c%d", sep, i); |
819 | sep = ','; | |
820 | } | |
e114e473 CS |
821 | |
822 | seq_putc(s, '\n'); | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
88e9d34c | 827 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 828 | .start = cipso_seq_start, |
e114e473 CS |
829 | .next = cipso_seq_next, |
830 | .show = cipso_seq_show, | |
40809565 | 831 | .stop = smk_seq_stop, |
e114e473 CS |
832 | }; |
833 | ||
834 | /** | |
835 | * smk_open_cipso - open() for /smack/cipso | |
836 | * @inode: inode structure representing file | |
837 | * @file: "cipso" file pointer | |
838 | * | |
839 | * Connect our cipso_seq_* operations with /smack/cipso | |
840 | * file_operations | |
841 | */ | |
842 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
843 | { | |
844 | return seq_open(file, &cipso_seq_ops); | |
845 | } | |
846 | ||
847 | /** | |
f7112e6c | 848 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 849 | * @file: file pointer, not actually used |
e114e473 CS |
850 | * @buf: where to get the data from |
851 | * @count: bytes sent | |
852 | * @ppos: where to start | |
f7112e6c | 853 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
854 | * |
855 | * Accepts only one cipso rule per write call. | |
856 | * Returns number of bytes written or error code, as appropriate | |
857 | */ | |
f7112e6c CS |
858 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
859 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
860 | { |
861 | struct smack_known *skp; | |
f7112e6c CS |
862 | struct netlbl_lsm_secattr ncats; |
863 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 864 | int maplevel; |
f7112e6c | 865 | unsigned int cat; |
e114e473 CS |
866 | int catlen; |
867 | ssize_t rc = -EINVAL; | |
868 | char *data = NULL; | |
869 | char *rule; | |
870 | int ret; | |
871 | int i; | |
872 | ||
873 | /* | |
874 | * Must have privilege. | |
875 | * No partial writes. | |
876 | * Enough data must be present. | |
877 | */ | |
1880eff7 | 878 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
879 | return -EPERM; |
880 | if (*ppos != 0) | |
881 | return -EINVAL; | |
f7112e6c CS |
882 | if (format == SMK_FIXED24_FMT && |
883 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
884 | return -EINVAL; |
885 | ||
886 | data = kzalloc(count + 1, GFP_KERNEL); | |
887 | if (data == NULL) | |
888 | return -ENOMEM; | |
889 | ||
890 | if (copy_from_user(data, buf, count) != 0) { | |
891 | rc = -EFAULT; | |
892 | goto unlockedout; | |
893 | } | |
894 | ||
895 | data[count] = '\0'; | |
896 | rule = data; | |
897 | /* | |
898 | * Only allow one writer at a time. Writes should be | |
899 | * quite rare and small in any case. | |
900 | */ | |
901 | mutex_lock(&smack_cipso_lock); | |
902 | ||
903 | skp = smk_import_entry(rule, 0); | |
e774ad68 LP |
904 | if (IS_ERR(skp)) { |
905 | rc = PTR_ERR(skp); | |
e114e473 | 906 | goto out; |
e774ad68 | 907 | } |
e114e473 | 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 = | |
01fa8474 | 989 | list_entry_rcu(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 | ||
21abb1ec | 1055 | static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
6d3dc07c | 1056 | { |
21abb1ec | 1057 | return smk_seq_start(s, pos, &smk_net4addr_list); |
6d3dc07c CS |
1058 | } |
1059 | ||
21abb1ec | 1060 | static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
6d3dc07c | 1061 | { |
21abb1ec | 1062 | return smk_seq_next(s, v, pos, &smk_net4addr_list); |
6d3dc07c | 1063 | } |
6d3dc07c CS |
1064 | |
1065 | /* | |
1066 | * Print host/label pairs | |
1067 | */ | |
21abb1ec | 1068 | static int net4addr_seq_show(struct seq_file *s, void *v) |
6d3dc07c | 1069 | { |
7198e2ee | 1070 | struct list_head *list = v; |
21abb1ec CS |
1071 | struct smk_net4addr *skp = |
1072 | list_entry_rcu(list, struct smk_net4addr, list); | |
1073 | char *kp = SMACK_CIPSO_OPTION; | |
6d3dc07c | 1074 | |
21abb1ec CS |
1075 | if (skp->smk_label != NULL) |
1076 | kp = skp->smk_label->smk_known; | |
1077 | seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr, | |
1078 | skp->smk_masks, kp); | |
6d3dc07c CS |
1079 | |
1080 | return 0; | |
1081 | } | |
1082 | ||
21abb1ec CS |
1083 | static const struct seq_operations net4addr_seq_ops = { |
1084 | .start = net4addr_seq_start, | |
1085 | .next = net4addr_seq_next, | |
1086 | .show = net4addr_seq_show, | |
40809565 | 1087 | .stop = smk_seq_stop, |
6d3dc07c CS |
1088 | }; |
1089 | ||
1090 | /** | |
21abb1ec | 1091 | * smk_open_net4addr - open() for /smack/netlabel |
6d3dc07c CS |
1092 | * @inode: inode structure representing file |
1093 | * @file: "netlabel" file pointer | |
1094 | * | |
21abb1ec | 1095 | * Connect our net4addr_seq_* operations with /smack/netlabel |
6d3dc07c CS |
1096 | * file_operations |
1097 | */ | |
21abb1ec | 1098 | static int smk_open_net4addr(struct inode *inode, struct file *file) |
6d3dc07c | 1099 | { |
21abb1ec | 1100 | return seq_open(file, &net4addr_seq_ops); |
6d3dc07c CS |
1101 | } |
1102 | ||
113a0e45 | 1103 | /** |
21abb1ec | 1104 | * smk_net4addr_insert |
113a0e45 | 1105 | * @new : netlabel to insert |
1106 | * | |
21abb1ec | 1107 | * This helper insert netlabel in the smack_net4addrs list |
113a0e45 | 1108 | * sorted by netmask length (longest to smallest) |
21abb1ec | 1109 | * locked by &smk_net4addr_lock in smk_write_net4addr |
7198e2ee | 1110 | * |
113a0e45 | 1111 | */ |
21abb1ec | 1112 | static void smk_net4addr_insert(struct smk_net4addr *new) |
113a0e45 | 1113 | { |
21abb1ec CS |
1114 | struct smk_net4addr *m; |
1115 | struct smk_net4addr *m_next; | |
113a0e45 | 1116 | |
21abb1ec CS |
1117 | if (list_empty(&smk_net4addr_list)) { |
1118 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1119 | return; |
1120 | } | |
1121 | ||
21abb1ec CS |
1122 | m = list_entry_rcu(smk_net4addr_list.next, |
1123 | struct smk_net4addr, list); | |
7198e2ee | 1124 | |
113a0e45 | 1125 | /* the comparison '>' is a bit hacky, but works */ |
21abb1ec CS |
1126 | if (new->smk_masks > m->smk_masks) { |
1127 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1128 | return; |
1129 | } | |
7198e2ee | 1130 | |
21abb1ec CS |
1131 | list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
1132 | if (list_is_last(&m->list, &smk_net4addr_list)) { | |
7198e2ee | 1133 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1134 | return; |
1135 | } | |
05725f7e | 1136 | m_next = list_entry_rcu(m->list.next, |
21abb1ec CS |
1137 | struct smk_net4addr, list); |
1138 | if (new->smk_masks > m_next->smk_masks) { | |
7198e2ee | 1139 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1140 | return; |
1141 | } | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | ||
6d3dc07c | 1146 | /** |
21abb1ec | 1147 | * smk_write_net4addr - write() for /smack/netlabel |
251a2a95 | 1148 | * @file: file pointer, not actually used |
6d3dc07c CS |
1149 | * @buf: where to get the data from |
1150 | * @count: bytes sent | |
1151 | * @ppos: where to start | |
1152 | * | |
21abb1ec | 1153 | * Accepts only one net4addr per write call. |
6d3dc07c CS |
1154 | * Returns number of bytes written or error code, as appropriate |
1155 | */ | |
21abb1ec | 1156 | static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
6d3dc07c CS |
1157 | size_t count, loff_t *ppos) |
1158 | { | |
21abb1ec | 1159 | struct smk_net4addr *snp; |
6d3dc07c | 1160 | struct sockaddr_in newname; |
f7112e6c | 1161 | char *smack; |
21abb1ec | 1162 | struct smack_known *skp = NULL; |
f7112e6c | 1163 | char *data; |
6d3dc07c CS |
1164 | char *host = (char *)&newname.sin_addr.s_addr; |
1165 | int rc; | |
1166 | struct netlbl_audit audit_info; | |
1167 | struct in_addr mask; | |
1168 | unsigned int m; | |
21abb1ec | 1169 | unsigned int masks; |
7198e2ee | 1170 | int found; |
113a0e45 | 1171 | u32 mask_bits = (1<<31); |
6d3dc07c | 1172 | __be32 nsa; |
113a0e45 | 1173 | u32 temp_mask; |
6d3dc07c CS |
1174 | |
1175 | /* | |
1176 | * Must have privilege. | |
1177 | * No partial writes. | |
1178 | * Enough data must be present. | |
1179 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1180 | * "<addr, as a.b.c.d><space><label>" | |
1181 | */ | |
1880eff7 | 1182 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1183 | return -EPERM; |
1184 | if (*ppos != 0) | |
1185 | return -EINVAL; | |
f7112e6c | 1186 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1187 | return -EINVAL; |
f7112e6c CS |
1188 | |
1189 | data = kzalloc(count + 1, GFP_KERNEL); | |
1190 | if (data == NULL) | |
1191 | return -ENOMEM; | |
1192 | ||
1193 | if (copy_from_user(data, buf, count) != 0) { | |
1194 | rc = -EFAULT; | |
1195 | goto free_data_out; | |
1196 | } | |
1197 | ||
1198 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1199 | if (smack == NULL) { | |
1200 | rc = -ENOMEM; | |
1201 | goto free_data_out; | |
1202 | } | |
6d3dc07c CS |
1203 | |
1204 | data[count] = '\0'; | |
1205 | ||
ec554fa7 | 1206 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
21abb1ec | 1207 | &host[0], &host[1], &host[2], &host[3], &masks, smack); |
6d3dc07c CS |
1208 | if (rc != 6) { |
1209 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1210 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1211 | if (rc != 5) { |
1212 | rc = -EINVAL; | |
1213 | goto free_out; | |
1214 | } | |
6d3dc07c | 1215 | m = BEBITS; |
21abb1ec | 1216 | masks = 32; |
6d3dc07c | 1217 | } |
21abb1ec | 1218 | if (masks > BEBITS) { |
f7112e6c CS |
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 | 1227 | skp = smk_import_entry(smack, 0); |
e774ad68 LP |
1228 | if (IS_ERR(skp)) { |
1229 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1230 | goto free_out; |
1231 | } | |
4303154e | 1232 | } else { |
21abb1ec CS |
1233 | /* |
1234 | * Only the -CIPSO option is supported for IPv4 | |
1235 | */ | |
1236 | if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { | |
f7112e6c CS |
1237 | rc = -EINVAL; |
1238 | goto free_out; | |
1239 | } | |
4303154e | 1240 | } |
6d3dc07c | 1241 | |
21abb1ec | 1242 | for (m = masks, temp_mask = 0; m > 0; m--) { |
113a0e45 | 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 | */ | |
21abb1ec | 1253 | mutex_lock(&smk_net4addr_lock); |
6d3dc07c CS |
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; |
21abb1ec CS |
1258 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
1259 | if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { | |
7198e2ee | 1260 | found = 1; |
6d3dc07c | 1261 | break; |
7198e2ee EB |
1262 | } |
1263 | } | |
6d3dc07c CS |
1264 | smk_netlabel_audit_set(&audit_info); |
1265 | ||
7198e2ee | 1266 | if (found == 0) { |
21c7eae2 LP |
1267 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
1268 | if (snp == NULL) | |
6d3dc07c CS |
1269 | rc = -ENOMEM; |
1270 | else { | |
1271 | rc = 0; | |
21abb1ec | 1272 | snp->smk_host.s_addr = newname.sin_addr.s_addr; |
21c7eae2 LP |
1273 | snp->smk_mask.s_addr = mask.s_addr; |
1274 | snp->smk_label = skp; | |
21abb1ec CS |
1275 | snp->smk_masks = masks; |
1276 | smk_net4addr_insert(snp); | |
6d3dc07c CS |
1277 | } |
1278 | } else { | |
21abb1ec CS |
1279 | /* |
1280 | * Delete the unlabeled entry, only if the previous label | |
1281 | * wasn't the special CIPSO option | |
1282 | */ | |
1283 | if (snp->smk_label != NULL) | |
4303154e | 1284 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
21abb1ec | 1285 | &snp->smk_host, &snp->smk_mask, |
4303154e EB |
1286 | PF_INET, &audit_info); |
1287 | else | |
1288 | rc = 0; | |
21c7eae2 | 1289 | snp->smk_label = skp; |
6d3dc07c CS |
1290 | } |
1291 | ||
1292 | /* | |
1293 | * Now tell netlabel about the single label nature of | |
1294 | * this host so that incoming packets get labeled. | |
4303154e | 1295 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1296 | */ |
21abb1ec | 1297 | if (rc == 0 && skp != NULL) |
6d3dc07c | 1298 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
21abb1ec | 1299 | &snp->smk_host, &snp->smk_mask, PF_INET, |
21c7eae2 | 1300 | snp->smk_label->smk_secid, &audit_info); |
6d3dc07c CS |
1301 | |
1302 | if (rc == 0) | |
1303 | rc = count; | |
1304 | ||
21abb1ec CS |
1305 | mutex_unlock(&smk_net4addr_lock); |
1306 | ||
1307 | free_out: | |
1308 | kfree(smack); | |
1309 | free_data_out: | |
1310 | kfree(data); | |
1311 | ||
1312 | return rc; | |
1313 | } | |
1314 | ||
1315 | static const struct file_operations smk_net4addr_ops = { | |
1316 | .open = smk_open_net4addr, | |
1317 | .read = seq_read, | |
1318 | .llseek = seq_lseek, | |
1319 | .write = smk_write_net4addr, | |
1320 | .release = seq_release, | |
1321 | }; | |
1322 | ||
1323 | #if IS_ENABLED(CONFIG_IPV6) | |
1324 | /* | |
1325 | * Seq_file read operations for /smack/netlabel6 | |
1326 | */ | |
1327 | ||
1328 | static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) | |
1329 | { | |
1330 | return smk_seq_start(s, pos, &smk_net6addr_list); | |
1331 | } | |
1332 | ||
1333 | static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1334 | { | |
1335 | return smk_seq_next(s, v, pos, &smk_net6addr_list); | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Print host/label pairs | |
1340 | */ | |
1341 | static int net6addr_seq_show(struct seq_file *s, void *v) | |
1342 | { | |
1343 | struct list_head *list = v; | |
1344 | struct smk_net6addr *skp = | |
1345 | list_entry(list, struct smk_net6addr, list); | |
1346 | ||
1347 | if (skp->smk_label != NULL) | |
1348 | seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks, | |
1349 | skp->smk_label->smk_known); | |
1350 | ||
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | static const struct seq_operations net6addr_seq_ops = { | |
1355 | .start = net6addr_seq_start, | |
1356 | .next = net6addr_seq_next, | |
1357 | .show = net6addr_seq_show, | |
1358 | .stop = smk_seq_stop, | |
1359 | }; | |
1360 | ||
1361 | /** | |
1362 | * smk_open_net6addr - open() for /smack/netlabel | |
1363 | * @inode: inode structure representing file | |
1364 | * @file: "netlabel" file pointer | |
1365 | * | |
1366 | * Connect our net6addr_seq_* operations with /smack/netlabel | |
1367 | * file_operations | |
1368 | */ | |
1369 | static int smk_open_net6addr(struct inode *inode, struct file *file) | |
1370 | { | |
1371 | return seq_open(file, &net6addr_seq_ops); | |
1372 | } | |
1373 | ||
1374 | /** | |
1375 | * smk_net6addr_insert | |
1376 | * @new : entry to insert | |
1377 | * | |
1378 | * This inserts an entry in the smack_net6addrs list | |
1379 | * sorted by netmask length (longest to smallest) | |
1380 | * locked by &smk_net6addr_lock in smk_write_net6addr | |
1381 | * | |
1382 | */ | |
1383 | static void smk_net6addr_insert(struct smk_net6addr *new) | |
1384 | { | |
1385 | struct smk_net6addr *m_next; | |
1386 | struct smk_net6addr *m; | |
1387 | ||
1388 | if (list_empty(&smk_net6addr_list)) { | |
1389 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1390 | return; | |
1391 | } | |
1392 | ||
1393 | m = list_entry_rcu(smk_net6addr_list.next, | |
1394 | struct smk_net6addr, list); | |
1395 | ||
1396 | if (new->smk_masks > m->smk_masks) { | |
1397 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1398 | return; | |
1399 | } | |
1400 | ||
1401 | list_for_each_entry_rcu(m, &smk_net6addr_list, list) { | |
1402 | if (list_is_last(&m->list, &smk_net6addr_list)) { | |
1403 | list_add_rcu(&new->list, &m->list); | |
1404 | return; | |
1405 | } | |
1406 | m_next = list_entry_rcu(m->list.next, | |
1407 | struct smk_net6addr, list); | |
1408 | if (new->smk_masks > m_next->smk_masks) { | |
1409 | list_add_rcu(&new->list, &m->list); | |
1410 | return; | |
1411 | } | |
1412 | } | |
1413 | } | |
1414 | ||
1415 | ||
1416 | /** | |
1417 | * smk_write_net6addr - write() for /smack/netlabel | |
1418 | * @file: file pointer, not actually used | |
1419 | * @buf: where to get the data from | |
1420 | * @count: bytes sent | |
1421 | * @ppos: where to start | |
1422 | * | |
1423 | * Accepts only one net6addr per write call. | |
1424 | * Returns number of bytes written or error code, as appropriate | |
1425 | */ | |
1426 | static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, | |
1427 | size_t count, loff_t *ppos) | |
1428 | { | |
1429 | struct smk_net6addr *snp; | |
1430 | struct in6_addr newname; | |
1431 | struct in6_addr fullmask; | |
1432 | struct smack_known *skp = NULL; | |
1433 | char *smack; | |
1434 | char *data; | |
1435 | int rc = 0; | |
1436 | int found = 0; | |
1437 | int i; | |
1438 | unsigned int scanned[8]; | |
1439 | unsigned int m; | |
1440 | unsigned int mask = 128; | |
1441 | ||
1442 | /* | |
1443 | * Must have privilege. | |
1444 | * No partial writes. | |
1445 | * Enough data must be present. | |
1446 | * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" | |
1447 | * "<addr, as a:b:c:d:e:f:g:h><space><label>" | |
1448 | */ | |
1449 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
1450 | return -EPERM; | |
1451 | if (*ppos != 0) | |
1452 | return -EINVAL; | |
1453 | if (count < SMK_NETLBLADDRMIN) | |
1454 | return -EINVAL; | |
1455 | ||
1456 | data = kzalloc(count + 1, GFP_KERNEL); | |
1457 | if (data == NULL) | |
1458 | return -ENOMEM; | |
1459 | ||
1460 | if (copy_from_user(data, buf, count) != 0) { | |
1461 | rc = -EFAULT; | |
1462 | goto free_data_out; | |
1463 | } | |
1464 | ||
1465 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1466 | if (smack == NULL) { | |
1467 | rc = -ENOMEM; | |
1468 | goto free_data_out; | |
1469 | } | |
1470 | ||
1471 | data[count] = '\0'; | |
1472 | ||
1473 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s", | |
1474 | &scanned[0], &scanned[1], &scanned[2], &scanned[3], | |
1475 | &scanned[4], &scanned[5], &scanned[6], &scanned[7], | |
1476 | &mask, smack); | |
1477 | if (i != 10) { | |
1478 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s", | |
1479 | &scanned[0], &scanned[1], &scanned[2], | |
1480 | &scanned[3], &scanned[4], &scanned[5], | |
1481 | &scanned[6], &scanned[7], smack); | |
1482 | if (i != 9) { | |
1483 | rc = -EINVAL; | |
1484 | goto free_out; | |
1485 | } | |
1486 | } | |
1487 | if (mask > 128) { | |
1488 | rc = -EINVAL; | |
1489 | goto free_out; | |
1490 | } | |
1491 | for (i = 0; i < 8; i++) { | |
1492 | if (scanned[i] > 0xffff) { | |
1493 | rc = -EINVAL; | |
1494 | goto free_out; | |
1495 | } | |
1496 | newname.s6_addr16[i] = htons(scanned[i]); | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * If smack begins with '-', it is an option, don't import it | |
1501 | */ | |
1502 | if (smack[0] != '-') { | |
1503 | skp = smk_import_entry(smack, 0); | |
5f2bfe2f LP |
1504 | if (IS_ERR(skp)) { |
1505 | rc = PTR_ERR(skp); | |
21abb1ec CS |
1506 | goto free_out; |
1507 | } | |
1508 | } else { | |
1509 | /* | |
1510 | * Only -DELETE is supported for IPv6 | |
1511 | */ | |
1512 | if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { | |
1513 | rc = -EINVAL; | |
1514 | goto free_out; | |
1515 | } | |
1516 | } | |
1517 | ||
1518 | for (i = 0, m = mask; i < 8; i++) { | |
1519 | if (m >= 16) { | |
1520 | fullmask.s6_addr16[i] = 0xffff; | |
1521 | m -= 16; | |
1522 | } else if (m > 0) { | |
1523 | fullmask.s6_addr16[i] = (1 << m) - 1; | |
1524 | m = 0; | |
1525 | } else | |
1526 | fullmask.s6_addr16[i] = 0; | |
1527 | newname.s6_addr16[i] &= fullmask.s6_addr16[i]; | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * Only allow one writer at a time. Writes should be | |
1532 | * quite rare and small in any case. | |
1533 | */ | |
1534 | mutex_lock(&smk_net6addr_lock); | |
1535 | /* | |
1536 | * Try to find the prefix in the list | |
1537 | */ | |
1538 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
1539 | if (mask != snp->smk_masks) | |
1540 | continue; | |
1541 | for (found = 1, i = 0; i < 8; i++) { | |
1542 | if (newname.s6_addr16[i] != | |
1543 | snp->smk_host.s6_addr16[i]) { | |
1544 | found = 0; | |
1545 | break; | |
1546 | } | |
1547 | } | |
1548 | if (found == 1) | |
1549 | break; | |
1550 | } | |
1551 | if (found == 0) { | |
1552 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); | |
1553 | if (snp == NULL) | |
1554 | rc = -ENOMEM; | |
1555 | else { | |
1556 | snp->smk_host = newname; | |
1557 | snp->smk_mask = fullmask; | |
1558 | snp->smk_masks = mask; | |
1559 | snp->smk_label = skp; | |
1560 | smk_net6addr_insert(snp); | |
1561 | } | |
1562 | } else { | |
1563 | snp->smk_label = skp; | |
1564 | } | |
1565 | ||
1566 | if (rc == 0) | |
1567 | rc = count; | |
1568 | ||
1569 | mutex_unlock(&smk_net6addr_lock); | |
6d3dc07c | 1570 | |
f7112e6c CS |
1571 | free_out: |
1572 | kfree(smack); | |
1573 | free_data_out: | |
1574 | kfree(data); | |
1575 | ||
6d3dc07c CS |
1576 | return rc; |
1577 | } | |
1578 | ||
21abb1ec CS |
1579 | static const struct file_operations smk_net6addr_ops = { |
1580 | .open = smk_open_net6addr, | |
6d3dc07c CS |
1581 | .read = seq_read, |
1582 | .llseek = seq_lseek, | |
21abb1ec | 1583 | .write = smk_write_net6addr, |
6d3dc07c CS |
1584 | .release = seq_release, |
1585 | }; | |
21abb1ec | 1586 | #endif /* CONFIG_IPV6 */ |
6d3dc07c | 1587 | |
e114e473 CS |
1588 | /** |
1589 | * smk_read_doi - read() for /smack/doi | |
1590 | * @filp: file pointer, not actually used | |
1591 | * @buf: where to put the result | |
1592 | * @count: maximum to send along | |
1593 | * @ppos: where to start | |
1594 | * | |
1595 | * Returns number of bytes read or error code, as appropriate | |
1596 | */ | |
1597 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1598 | size_t count, loff_t *ppos) | |
1599 | { | |
1600 | char temp[80]; | |
1601 | ssize_t rc; | |
1602 | ||
1603 | if (*ppos != 0) | |
1604 | return 0; | |
1605 | ||
1606 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1607 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1608 | ||
1609 | return rc; | |
1610 | } | |
1611 | ||
1612 | /** | |
1613 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1614 | * @file: file pointer, not actually used |
e114e473 CS |
1615 | * @buf: where to get the data from |
1616 | * @count: bytes sent | |
1617 | * @ppos: where to start | |
1618 | * | |
1619 | * Returns number of bytes written or error code, as appropriate | |
1620 | */ | |
1621 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1622 | size_t count, loff_t *ppos) | |
1623 | { | |
1624 | char temp[80]; | |
1625 | int i; | |
1626 | ||
1880eff7 | 1627 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1628 | return -EPERM; |
1629 | ||
1630 | if (count >= sizeof(temp) || count == 0) | |
1631 | return -EINVAL; | |
1632 | ||
1633 | if (copy_from_user(temp, buf, count) != 0) | |
1634 | return -EFAULT; | |
1635 | ||
1636 | temp[count] = '\0'; | |
1637 | ||
1638 | if (sscanf(temp, "%d", &i) != 1) | |
1639 | return -EINVAL; | |
1640 | ||
1641 | smk_cipso_doi_value = i; | |
1642 | ||
1643 | smk_cipso_doi(); | |
1644 | ||
1645 | return count; | |
1646 | } | |
1647 | ||
1648 | static const struct file_operations smk_doi_ops = { | |
1649 | .read = smk_read_doi, | |
1650 | .write = smk_write_doi, | |
6038f373 | 1651 | .llseek = default_llseek, |
e114e473 CS |
1652 | }; |
1653 | ||
1654 | /** | |
1655 | * smk_read_direct - read() for /smack/direct | |
1656 | * @filp: file pointer, not actually used | |
1657 | * @buf: where to put the result | |
1658 | * @count: maximum to send along | |
1659 | * @ppos: where to start | |
1660 | * | |
1661 | * Returns number of bytes read or error code, as appropriate | |
1662 | */ | |
1663 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1664 | size_t count, loff_t *ppos) | |
1665 | { | |
1666 | char temp[80]; | |
1667 | ssize_t rc; | |
1668 | ||
1669 | if (*ppos != 0) | |
1670 | return 0; | |
1671 | ||
1672 | sprintf(temp, "%d", smack_cipso_direct); | |
1673 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1674 | ||
1675 | return rc; | |
1676 | } | |
1677 | ||
1678 | /** | |
1679 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1680 | * @file: file pointer, not actually used |
e114e473 CS |
1681 | * @buf: where to get the data from |
1682 | * @count: bytes sent | |
1683 | * @ppos: where to start | |
1684 | * | |
1685 | * Returns number of bytes written or error code, as appropriate | |
1686 | */ | |
1687 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1688 | size_t count, loff_t *ppos) | |
1689 | { | |
f7112e6c | 1690 | struct smack_known *skp; |
e114e473 CS |
1691 | char temp[80]; |
1692 | int i; | |
1693 | ||
1880eff7 | 1694 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1695 | return -EPERM; |
1696 | ||
1697 | if (count >= sizeof(temp) || count == 0) | |
1698 | return -EINVAL; | |
1699 | ||
1700 | if (copy_from_user(temp, buf, count) != 0) | |
1701 | return -EFAULT; | |
1702 | ||
1703 | temp[count] = '\0'; | |
1704 | ||
1705 | if (sscanf(temp, "%d", &i) != 1) | |
1706 | return -EINVAL; | |
1707 | ||
f7112e6c CS |
1708 | /* |
1709 | * Don't do anything if the value hasn't actually changed. | |
1710 | * If it is changing reset the level on entries that were | |
1711 | * set up to be direct when they were created. | |
1712 | */ | |
1713 | if (smack_cipso_direct != i) { | |
1714 | mutex_lock(&smack_known_lock); | |
1715 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1716 | if (skp->smk_netlabel.attr.mls.lvl == | |
1717 | smack_cipso_direct) | |
1718 | skp->smk_netlabel.attr.mls.lvl = i; | |
1719 | smack_cipso_direct = i; | |
1720 | mutex_unlock(&smack_known_lock); | |
1721 | } | |
e114e473 CS |
1722 | |
1723 | return count; | |
1724 | } | |
1725 | ||
1726 | static const struct file_operations smk_direct_ops = { | |
1727 | .read = smk_read_direct, | |
1728 | .write = smk_write_direct, | |
6038f373 | 1729 | .llseek = default_llseek, |
e114e473 CS |
1730 | }; |
1731 | ||
f7112e6c CS |
1732 | /** |
1733 | * smk_read_mapped - read() for /smack/mapped | |
1734 | * @filp: file pointer, not actually used | |
1735 | * @buf: where to put the result | |
1736 | * @count: maximum to send along | |
1737 | * @ppos: where to start | |
1738 | * | |
1739 | * Returns number of bytes read or error code, as appropriate | |
1740 | */ | |
1741 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1742 | size_t count, loff_t *ppos) | |
1743 | { | |
1744 | char temp[80]; | |
1745 | ssize_t rc; | |
1746 | ||
1747 | if (*ppos != 0) | |
1748 | return 0; | |
1749 | ||
1750 | sprintf(temp, "%d", smack_cipso_mapped); | |
1751 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1752 | ||
1753 | return rc; | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * smk_write_mapped - write() for /smack/mapped | |
1758 | * @file: file pointer, not actually used | |
1759 | * @buf: where to get the data from | |
1760 | * @count: bytes sent | |
1761 | * @ppos: where to start | |
1762 | * | |
1763 | * Returns number of bytes written or error code, as appropriate | |
1764 | */ | |
1765 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1766 | size_t count, loff_t *ppos) | |
1767 | { | |
1768 | struct smack_known *skp; | |
1769 | char temp[80]; | |
1770 | int i; | |
1771 | ||
1880eff7 | 1772 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1773 | return -EPERM; |
1774 | ||
1775 | if (count >= sizeof(temp) || count == 0) | |
1776 | return -EINVAL; | |
1777 | ||
1778 | if (copy_from_user(temp, buf, count) != 0) | |
1779 | return -EFAULT; | |
1780 | ||
1781 | temp[count] = '\0'; | |
1782 | ||
1783 | if (sscanf(temp, "%d", &i) != 1) | |
1784 | return -EINVAL; | |
1785 | ||
1786 | /* | |
1787 | * Don't do anything if the value hasn't actually changed. | |
1788 | * If it is changing reset the level on entries that were | |
1789 | * set up to be mapped when they were created. | |
1790 | */ | |
1791 | if (smack_cipso_mapped != i) { | |
1792 | mutex_lock(&smack_known_lock); | |
1793 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1794 | if (skp->smk_netlabel.attr.mls.lvl == | |
1795 | smack_cipso_mapped) | |
1796 | skp->smk_netlabel.attr.mls.lvl = i; | |
1797 | smack_cipso_mapped = i; | |
1798 | mutex_unlock(&smack_known_lock); | |
1799 | } | |
1800 | ||
1801 | return count; | |
1802 | } | |
1803 | ||
1804 | static const struct file_operations smk_mapped_ops = { | |
1805 | .read = smk_read_mapped, | |
1806 | .write = smk_write_mapped, | |
1807 | .llseek = default_llseek, | |
1808 | }; | |
1809 | ||
e114e473 CS |
1810 | /** |
1811 | * smk_read_ambient - read() for /smack/ambient | |
1812 | * @filp: file pointer, not actually used | |
1813 | * @buf: where to put the result | |
1814 | * @cn: maximum to send along | |
1815 | * @ppos: where to start | |
1816 | * | |
1817 | * Returns number of bytes read or error code, as appropriate | |
1818 | */ | |
1819 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1820 | size_t cn, loff_t *ppos) | |
1821 | { | |
1822 | ssize_t rc; | |
e114e473 CS |
1823 | int asize; |
1824 | ||
1825 | if (*ppos != 0) | |
1826 | return 0; | |
1827 | /* | |
1828 | * Being careful to avoid a problem in the case where | |
1829 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1830 | */ |
4bc87e62 | 1831 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1832 | |
2f823ff8 | 1833 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1834 | |
1835 | if (cn >= asize) | |
1836 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1837 | smack_net_ambient->smk_known, |
1838 | asize); | |
4bc87e62 CS |
1839 | else |
1840 | rc = -EINVAL; | |
e114e473 | 1841 | |
4bc87e62 | 1842 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1843 | |
1844 | return rc; | |
1845 | } | |
1846 | ||
1847 | /** | |
1848 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1849 | * @file: file pointer, not actually used |
e114e473 CS |
1850 | * @buf: where to get the data from |
1851 | * @count: bytes sent | |
1852 | * @ppos: where to start | |
1853 | * | |
1854 | * Returns number of bytes written or error code, as appropriate | |
1855 | */ | |
1856 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1857 | size_t count, loff_t *ppos) | |
1858 | { | |
2f823ff8 | 1859 | struct smack_known *skp; |
4bc87e62 | 1860 | char *oldambient; |
f7112e6c CS |
1861 | char *data; |
1862 | int rc = count; | |
e114e473 | 1863 | |
1880eff7 | 1864 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1865 | return -EPERM; |
1866 | ||
f7112e6c CS |
1867 | data = kzalloc(count + 1, GFP_KERNEL); |
1868 | if (data == NULL) | |
1869 | return -ENOMEM; | |
e114e473 | 1870 | |
f7112e6c CS |
1871 | if (copy_from_user(data, buf, count) != 0) { |
1872 | rc = -EFAULT; | |
1873 | goto out; | |
1874 | } | |
e114e473 | 1875 | |
2f823ff8 | 1876 | skp = smk_import_entry(data, count); |
e774ad68 LP |
1877 | if (IS_ERR(skp)) { |
1878 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1879 | goto out; |
1880 | } | |
e114e473 | 1881 | |
4bc87e62 CS |
1882 | mutex_lock(&smack_ambient_lock); |
1883 | ||
2f823ff8 CS |
1884 | oldambient = smack_net_ambient->smk_known; |
1885 | smack_net_ambient = skp; | |
4bc87e62 CS |
1886 | smk_unlbl_ambient(oldambient); |
1887 | ||
1888 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1889 | |
f7112e6c CS |
1890 | out: |
1891 | kfree(data); | |
1892 | return rc; | |
e114e473 CS |
1893 | } |
1894 | ||
1895 | static const struct file_operations smk_ambient_ops = { | |
1896 | .read = smk_read_ambient, | |
1897 | .write = smk_write_ambient, | |
6038f373 | 1898 | .llseek = default_llseek, |
e114e473 CS |
1899 | }; |
1900 | ||
c0d77c88 RK |
1901 | /* |
1902 | * Seq_file operations for /smack/onlycap | |
15446235 | 1903 | */ |
c0d77c88 | 1904 | static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
15446235 | 1905 | { |
c0d77c88 RK |
1906 | return smk_seq_start(s, pos, &smack_onlycap_list); |
1907 | } | |
15446235 | 1908 | |
c0d77c88 RK |
1909 | static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1910 | { | |
1911 | return smk_seq_next(s, v, pos, &smack_onlycap_list); | |
1912 | } | |
15446235 | 1913 | |
c0d77c88 RK |
1914 | static int onlycap_seq_show(struct seq_file *s, void *v) |
1915 | { | |
1916 | struct list_head *list = v; | |
1917 | struct smack_onlycap *sop = | |
1918 | list_entry_rcu(list, struct smack_onlycap, list); | |
15446235 | 1919 | |
c0d77c88 RK |
1920 | seq_puts(s, sop->smk_label->smk_known); |
1921 | seq_putc(s, ' '); | |
15446235 | 1922 | |
c0d77c88 RK |
1923 | return 0; |
1924 | } | |
15446235 | 1925 | |
c0d77c88 RK |
1926 | static const struct seq_operations onlycap_seq_ops = { |
1927 | .start = onlycap_seq_start, | |
1928 | .next = onlycap_seq_next, | |
1929 | .show = onlycap_seq_show, | |
1930 | .stop = smk_seq_stop, | |
1931 | }; | |
1932 | ||
1933 | static int smk_open_onlycap(struct inode *inode, struct file *file) | |
1934 | { | |
1935 | return seq_open(file, &onlycap_seq_ops); | |
1936 | } | |
1937 | ||
1938 | /** | |
1939 | * smk_list_swap_rcu - swap public list with a private one in RCU-safe way | |
1940 | * The caller must hold appropriate mutex to prevent concurrent modifications | |
1941 | * to the public list. | |
1942 | * Private list is assumed to be not accessible to other threads yet. | |
1943 | * | |
1944 | * @public: public list | |
1945 | * @private: private list | |
1946 | */ | |
1947 | static void smk_list_swap_rcu(struct list_head *public, | |
1948 | struct list_head *private) | |
1949 | { | |
1950 | struct list_head *first, *last; | |
1951 | ||
1952 | if (list_empty(public)) { | |
1953 | list_splice_init_rcu(private, public, synchronize_rcu); | |
1954 | } else { | |
1955 | /* Remember public list before replacing it */ | |
1956 | first = public->next; | |
1957 | last = public->prev; | |
1958 | ||
1959 | /* Publish private list in place of public in RCU-safe way */ | |
1960 | private->prev->next = public; | |
1961 | private->next->prev = public; | |
1962 | rcu_assign_pointer(public->next, private->next); | |
1963 | public->prev = private->prev; | |
1964 | ||
1965 | synchronize_rcu(); | |
1966 | ||
1967 | /* When all readers are done with the old public list, | |
1968 | * attach it in place of private */ | |
1969 | private->next = first; | |
1970 | private->prev = last; | |
1971 | first->prev = private; | |
1972 | last->next = private; | |
1973 | } | |
15446235 CS |
1974 | } |
1975 | ||
1976 | /** | |
00f84f3f | 1977 | * smk_write_onlycap - write() for smackfs/onlycap |
251a2a95 | 1978 | * @file: file pointer, not actually used |
15446235 CS |
1979 | * @buf: where to get the data from |
1980 | * @count: bytes sent | |
1981 | * @ppos: where to start | |
1982 | * | |
1983 | * Returns number of bytes written or error code, as appropriate | |
1984 | */ | |
1985 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1986 | size_t count, loff_t *ppos) | |
1987 | { | |
f7112e6c | 1988 | char *data; |
c0d77c88 RK |
1989 | char *data_parse; |
1990 | char *tok; | |
1991 | struct smack_known *skp; | |
1992 | struct smack_onlycap *sop; | |
1993 | struct smack_onlycap *sop2; | |
1994 | LIST_HEAD(list_tmp); | |
f7112e6c | 1995 | int rc = count; |
15446235 | 1996 | |
1880eff7 | 1997 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
1998 | return -EPERM; |
1999 | ||
b862e561 | 2000 | data = kzalloc(count + 1, GFP_KERNEL); |
f7112e6c CS |
2001 | if (data == NULL) |
2002 | return -ENOMEM; | |
15446235 | 2003 | |
e774ad68 | 2004 | if (copy_from_user(data, buf, count) != 0) { |
c0d77c88 RK |
2005 | kfree(data); |
2006 | return -EFAULT; | |
e774ad68 LP |
2007 | } |
2008 | ||
c0d77c88 RK |
2009 | data_parse = data; |
2010 | while ((tok = strsep(&data_parse, " ")) != NULL) { | |
2011 | if (!*tok) | |
2012 | continue; | |
2013 | ||
2014 | skp = smk_import_entry(tok, 0); | |
2015 | if (IS_ERR(skp)) { | |
2016 | rc = PTR_ERR(skp); | |
2017 | break; | |
2018 | } | |
2019 | ||
2020 | sop = kzalloc(sizeof(*sop), GFP_KERNEL); | |
2021 | if (sop == NULL) { | |
2022 | rc = -ENOMEM; | |
2023 | break; | |
2024 | } | |
2025 | ||
2026 | sop->smk_label = skp; | |
2027 | list_add_rcu(&sop->list, &list_tmp); | |
2028 | } | |
2029 | kfree(data); | |
2030 | ||
15446235 | 2031 | /* |
e774ad68 LP |
2032 | * Clear the smack_onlycap on invalid label errors. This means |
2033 | * that we can pass a null string to unset the onlycap value. | |
f7112e6c | 2034 | * |
e774ad68 | 2035 | * Importing will also reject a label beginning with '-', |
f7112e6c | 2036 | * so "-usecapabilities" will also work. |
e774ad68 LP |
2037 | * |
2038 | * But do so only on invalid label, not on system errors. | |
c0d77c88 | 2039 | * The invalid label must be first to count as clearing attempt. |
15446235 | 2040 | */ |
c0d77c88 RK |
2041 | if (rc == -EINVAL && list_empty(&list_tmp)) |
2042 | rc = count; | |
2043 | ||
2044 | if (rc >= 0) { | |
2045 | mutex_lock(&smack_onlycap_lock); | |
2046 | smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); | |
2047 | mutex_unlock(&smack_onlycap_lock); | |
e774ad68 LP |
2048 | } |
2049 | ||
c0d77c88 RK |
2050 | list_for_each_entry_safe(sop, sop2, &list_tmp, list) |
2051 | kfree(sop); | |
15446235 | 2052 | |
f7112e6c | 2053 | return rc; |
15446235 CS |
2054 | } |
2055 | ||
2056 | static const struct file_operations smk_onlycap_ops = { | |
c0d77c88 RK |
2057 | .open = smk_open_onlycap, |
2058 | .read = seq_read, | |
15446235 | 2059 | .write = smk_write_onlycap, |
c0d77c88 RK |
2060 | .llseek = seq_lseek, |
2061 | .release = seq_release, | |
15446235 CS |
2062 | }; |
2063 | ||
bf4b2fee CS |
2064 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2065 | /** | |
2066 | * smk_read_unconfined - read() for smackfs/unconfined | |
2067 | * @filp: file pointer, not actually used | |
2068 | * @buf: where to put the result | |
2069 | * @cn: maximum to send along | |
2070 | * @ppos: where to start | |
2071 | * | |
2072 | * Returns number of bytes read or error code, as appropriate | |
2073 | */ | |
2074 | static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, | |
2075 | size_t cn, loff_t *ppos) | |
2076 | { | |
2077 | char *smack = ""; | |
2078 | ssize_t rc = -EINVAL; | |
2079 | int asize; | |
2080 | ||
2081 | if (*ppos != 0) | |
2082 | return 0; | |
2083 | ||
2084 | if (smack_unconfined != NULL) | |
2085 | smack = smack_unconfined->smk_known; | |
2086 | ||
2087 | asize = strlen(smack) + 1; | |
2088 | ||
2089 | if (cn >= asize) | |
2090 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
2091 | ||
2092 | return rc; | |
2093 | } | |
2094 | ||
2095 | /** | |
2096 | * smk_write_unconfined - write() for smackfs/unconfined | |
2097 | * @file: file pointer, not actually used | |
2098 | * @buf: where to get the data from | |
2099 | * @count: bytes sent | |
2100 | * @ppos: where to start | |
2101 | * | |
2102 | * Returns number of bytes written or error code, as appropriate | |
2103 | */ | |
2104 | static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, | |
2105 | size_t count, loff_t *ppos) | |
2106 | { | |
2107 | char *data; | |
e774ad68 | 2108 | struct smack_known *skp; |
bf4b2fee CS |
2109 | int rc = count; |
2110 | ||
2111 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2112 | return -EPERM; | |
2113 | ||
2114 | data = kzalloc(count + 1, GFP_KERNEL); | |
2115 | if (data == NULL) | |
2116 | return -ENOMEM; | |
2117 | ||
e774ad68 LP |
2118 | if (copy_from_user(data, buf, count) != 0) { |
2119 | rc = -EFAULT; | |
2120 | goto freeout; | |
2121 | } | |
2122 | ||
bf4b2fee | 2123 | /* |
e774ad68 LP |
2124 | * Clear the smack_unconfined on invalid label errors. This means |
2125 | * that we can pass a null string to unset the unconfined value. | |
bf4b2fee | 2126 | * |
e774ad68 | 2127 | * Importing will also reject a label beginning with '-', |
bf4b2fee | 2128 | * so "-confine" will also work. |
e774ad68 LP |
2129 | * |
2130 | * But do so only on invalid label, not on system errors. | |
bf4b2fee | 2131 | */ |
e774ad68 LP |
2132 | skp = smk_import_entry(data, count); |
2133 | if (PTR_ERR(skp) == -EINVAL) | |
2134 | skp = NULL; | |
2135 | else if (IS_ERR(skp)) { | |
2136 | rc = PTR_ERR(skp); | |
2137 | goto freeout; | |
2138 | } | |
2139 | ||
2140 | smack_unconfined = skp; | |
bf4b2fee | 2141 | |
e774ad68 | 2142 | freeout: |
bf4b2fee CS |
2143 | kfree(data); |
2144 | return rc; | |
2145 | } | |
2146 | ||
2147 | static const struct file_operations smk_unconfined_ops = { | |
2148 | .read = smk_read_unconfined, | |
2149 | .write = smk_write_unconfined, | |
2150 | .llseek = default_llseek, | |
2151 | }; | |
2152 | #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ | |
2153 | ||
ecfcc53f EB |
2154 | /** |
2155 | * smk_read_logging - read() for /smack/logging | |
2156 | * @filp: file pointer, not actually used | |
2157 | * @buf: where to put the result | |
2158 | * @cn: maximum to send along | |
2159 | * @ppos: where to start | |
2160 | * | |
2161 | * Returns number of bytes read or error code, as appropriate | |
2162 | */ | |
2163 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
2164 | size_t count, loff_t *ppos) | |
2165 | { | |
2166 | char temp[32]; | |
2167 | ssize_t rc; | |
2168 | ||
2169 | if (*ppos != 0) | |
2170 | return 0; | |
2171 | ||
2172 | sprintf(temp, "%d\n", log_policy); | |
2173 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2174 | return rc; | |
2175 | } | |
2176 | ||
2177 | /** | |
2178 | * smk_write_logging - write() for /smack/logging | |
2179 | * @file: file pointer, not actually used | |
2180 | * @buf: where to get the data from | |
2181 | * @count: bytes sent | |
2182 | * @ppos: where to start | |
2183 | * | |
2184 | * Returns number of bytes written or error code, as appropriate | |
2185 | */ | |
2186 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
2187 | size_t count, loff_t *ppos) | |
2188 | { | |
2189 | char temp[32]; | |
2190 | int i; | |
2191 | ||
1880eff7 | 2192 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
2193 | return -EPERM; |
2194 | ||
2195 | if (count >= sizeof(temp) || count == 0) | |
2196 | return -EINVAL; | |
2197 | ||
2198 | if (copy_from_user(temp, buf, count) != 0) | |
2199 | return -EFAULT; | |
2200 | ||
2201 | temp[count] = '\0'; | |
2202 | ||
2203 | if (sscanf(temp, "%d", &i) != 1) | |
2204 | return -EINVAL; | |
2205 | if (i < 0 || i > 3) | |
2206 | return -EINVAL; | |
2207 | log_policy = i; | |
2208 | return count; | |
2209 | } | |
2210 | ||
2211 | ||
2212 | ||
2213 | static const struct file_operations smk_logging_ops = { | |
2214 | .read = smk_read_logging, | |
2215 | .write = smk_write_logging, | |
6038f373 | 2216 | .llseek = default_llseek, |
ecfcc53f | 2217 | }; |
7898e1f8 CS |
2218 | |
2219 | /* | |
2220 | * Seq_file read operations for /smack/load-self | |
2221 | */ | |
2222 | ||
2223 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
2224 | { | |
2225 | struct task_smack *tsp = current_security(); | |
2226 | ||
40809565 | 2227 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
2228 | } |
2229 | ||
2230 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2231 | { | |
2232 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 2233 | |
40809565 | 2234 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
2235 | } |
2236 | ||
2237 | static int load_self_seq_show(struct seq_file *s, void *v) | |
2238 | { | |
2239 | struct list_head *list = v; | |
2240 | struct smack_rule *srp = | |
01fa8474 | 2241 | list_entry_rcu(list, struct smack_rule, list); |
7898e1f8 | 2242 | |
f7112e6c | 2243 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
2244 | |
2245 | return 0; | |
2246 | } | |
2247 | ||
7898e1f8 CS |
2248 | static const struct seq_operations load_self_seq_ops = { |
2249 | .start = load_self_seq_start, | |
2250 | .next = load_self_seq_next, | |
2251 | .show = load_self_seq_show, | |
40809565 | 2252 | .stop = smk_seq_stop, |
7898e1f8 CS |
2253 | }; |
2254 | ||
2255 | ||
2256 | /** | |
f7112e6c | 2257 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
2258 | * @inode: inode structure representing file |
2259 | * @file: "load" file pointer | |
2260 | * | |
2261 | * For reading, use load_seq_* seq_file reading operations. | |
2262 | */ | |
2263 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
2264 | { | |
2265 | return seq_open(file, &load_self_seq_ops); | |
2266 | } | |
2267 | ||
2268 | /** | |
2269 | * smk_write_load_self - write() for /smack/load-self | |
2270 | * @file: file pointer, not actually used | |
2271 | * @buf: where to get the data from | |
2272 | * @count: bytes sent | |
2273 | * @ppos: where to start - must be 0 | |
2274 | * | |
2275 | */ | |
2276 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
2277 | size_t count, loff_t *ppos) | |
2278 | { | |
2279 | struct task_smack *tsp = current_security(); | |
2280 | ||
f7112e6c CS |
2281 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
2282 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
2283 | } |
2284 | ||
2285 | static const struct file_operations smk_load_self_ops = { | |
2286 | .open = smk_open_load_self, | |
2287 | .read = seq_read, | |
2288 | .llseek = seq_lseek, | |
2289 | .write = smk_write_load_self, | |
2290 | .release = seq_release, | |
2291 | }; | |
828716c2 JS |
2292 | |
2293 | /** | |
f7112e6c | 2294 | * smk_user_access - handle access check transaction |
828716c2 JS |
2295 | * @file: file pointer |
2296 | * @buf: data from user space | |
2297 | * @count: bytes sent | |
2298 | * @ppos: where to start - must be 0 | |
2299 | */ | |
f7112e6c CS |
2300 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
2301 | size_t count, loff_t *ppos, int format) | |
828716c2 | 2302 | { |
e05b6f98 | 2303 | struct smack_parsed_rule rule; |
828716c2 | 2304 | char *data; |
f8859d98 | 2305 | int res; |
828716c2 | 2306 | |
828716c2 JS |
2307 | data = simple_transaction_get(file, buf, count); |
2308 | if (IS_ERR(data)) | |
2309 | return PTR_ERR(data); | |
2310 | ||
f7112e6c CS |
2311 | if (format == SMK_FIXED24_FMT) { |
2312 | if (count < SMK_LOADLEN) | |
2313 | return -EINVAL; | |
2314 | res = smk_parse_rule(data, &rule, 0); | |
2315 | } else { | |
2316 | /* | |
10289b0f | 2317 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 2318 | */ |
10289b0f | 2319 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
2320 | } |
2321 | ||
398ce073 JS |
2322 | if (res >= 0) |
2323 | res = smk_access(rule.smk_subject, rule.smk_object, | |
2324 | rule.smk_access1, NULL); | |
2325 | else if (res != -ENOENT) | |
e774ad68 | 2326 | return res; |
828716c2 | 2327 | |
d166c802 CS |
2328 | /* |
2329 | * smk_access() can return a value > 0 in the "bringup" case. | |
2330 | */ | |
2331 | data[0] = res >= 0 ? '1' : '0'; | |
f8859d98 | 2332 | data[1] = '\0'; |
828716c2 | 2333 | |
d86b2b61 | 2334 | simple_transaction_set(file, 2); |
f7112e6c CS |
2335 | |
2336 | if (format == SMK_FIXED24_FMT) | |
2337 | return SMK_LOADLEN; | |
2338 | return count; | |
2339 | } | |
2340 | ||
2341 | /** | |
2342 | * smk_write_access - handle access check transaction | |
2343 | * @file: file pointer | |
2344 | * @buf: data from user space | |
2345 | * @count: bytes sent | |
2346 | * @ppos: where to start - must be 0 | |
2347 | */ | |
2348 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
2349 | size_t count, loff_t *ppos) | |
2350 | { | |
2351 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
2352 | } |
2353 | ||
2354 | static const struct file_operations smk_access_ops = { | |
2355 | .write = smk_write_access, | |
2356 | .read = simple_transaction_read, | |
2357 | .release = simple_transaction_release, | |
2358 | .llseek = generic_file_llseek, | |
2359 | }; | |
2360 | ||
f7112e6c CS |
2361 | |
2362 | /* | |
2363 | * Seq_file read operations for /smack/load2 | |
2364 | */ | |
2365 | ||
2366 | static int load2_seq_show(struct seq_file *s, void *v) | |
2367 | { | |
2368 | struct list_head *list = v; | |
2369 | struct smack_master_list *smlp = | |
01fa8474 | 2370 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
2371 | |
2372 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
2373 | ||
2374 | return 0; | |
2375 | } | |
2376 | ||
2377 | static const struct seq_operations load2_seq_ops = { | |
2378 | .start = load2_seq_start, | |
2379 | .next = load2_seq_next, | |
2380 | .show = load2_seq_show, | |
2381 | .stop = smk_seq_stop, | |
2382 | }; | |
2383 | ||
2384 | /** | |
2385 | * smk_open_load2 - open() for /smack/load2 | |
2386 | * @inode: inode structure representing file | |
2387 | * @file: "load2" file pointer | |
2388 | * | |
2389 | * For reading, use load2_seq_* seq_file reading operations. | |
2390 | */ | |
2391 | static int smk_open_load2(struct inode *inode, struct file *file) | |
2392 | { | |
2393 | return seq_open(file, &load2_seq_ops); | |
2394 | } | |
2395 | ||
2396 | /** | |
2397 | * smk_write_load2 - write() for /smack/load2 | |
2398 | * @file: file pointer, not actually used | |
2399 | * @buf: where to get the data from | |
2400 | * @count: bytes sent | |
2401 | * @ppos: where to start - must be 0 | |
2402 | * | |
2403 | */ | |
2404 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
2405 | size_t count, loff_t *ppos) | |
2406 | { | |
2407 | /* | |
2408 | * Must have privilege. | |
2409 | */ | |
1880eff7 | 2410 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
2411 | return -EPERM; |
2412 | ||
2413 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2414 | SMK_LONG_FMT); | |
2415 | } | |
2416 | ||
2417 | static const struct file_operations smk_load2_ops = { | |
2418 | .open = smk_open_load2, | |
2419 | .read = seq_read, | |
2420 | .llseek = seq_lseek, | |
2421 | .write = smk_write_load2, | |
2422 | .release = seq_release, | |
2423 | }; | |
2424 | ||
2425 | /* | |
2426 | * Seq_file read operations for /smack/load-self2 | |
2427 | */ | |
2428 | ||
2429 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
2430 | { | |
2431 | struct task_smack *tsp = current_security(); | |
2432 | ||
2433 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
2434 | } | |
2435 | ||
2436 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2437 | { | |
2438 | struct task_smack *tsp = current_security(); | |
2439 | ||
2440 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
2441 | } | |
2442 | ||
2443 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
2444 | { | |
2445 | struct list_head *list = v; | |
2446 | struct smack_rule *srp = | |
01fa8474 | 2447 | list_entry_rcu(list, struct smack_rule, list); |
f7112e6c CS |
2448 | |
2449 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
2450 | ||
2451 | return 0; | |
2452 | } | |
2453 | ||
2454 | static const struct seq_operations load_self2_seq_ops = { | |
2455 | .start = load_self2_seq_start, | |
2456 | .next = load_self2_seq_next, | |
2457 | .show = load_self2_seq_show, | |
2458 | .stop = smk_seq_stop, | |
2459 | }; | |
2460 | ||
2461 | /** | |
2462 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2463 | * @inode: inode structure representing file | |
2464 | * @file: "load" file pointer | |
2465 | * | |
2466 | * For reading, use load_seq_* seq_file reading operations. | |
2467 | */ | |
2468 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2469 | { | |
2470 | return seq_open(file, &load_self2_seq_ops); | |
2471 | } | |
2472 | ||
2473 | /** | |
2474 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2475 | * @file: file pointer, not actually used | |
2476 | * @buf: where to get the data from | |
2477 | * @count: bytes sent | |
2478 | * @ppos: where to start - must be 0 | |
2479 | * | |
2480 | */ | |
2481 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2482 | size_t count, loff_t *ppos) | |
2483 | { | |
2484 | struct task_smack *tsp = current_security(); | |
2485 | ||
2486 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2487 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2488 | } | |
2489 | ||
2490 | static const struct file_operations smk_load_self2_ops = { | |
2491 | .open = smk_open_load_self2, | |
2492 | .read = seq_read, | |
2493 | .llseek = seq_lseek, | |
2494 | .write = smk_write_load_self2, | |
2495 | .release = seq_release, | |
2496 | }; | |
2497 | ||
2498 | /** | |
2499 | * smk_write_access2 - handle access check transaction | |
2500 | * @file: file pointer | |
2501 | * @buf: data from user space | |
2502 | * @count: bytes sent | |
2503 | * @ppos: where to start - must be 0 | |
2504 | */ | |
2505 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2506 | size_t count, loff_t *ppos) | |
2507 | { | |
2508 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2509 | } | |
2510 | ||
2511 | static const struct file_operations smk_access2_ops = { | |
2512 | .write = smk_write_access2, | |
2513 | .read = simple_transaction_read, | |
2514 | .release = simple_transaction_release, | |
2515 | .llseek = generic_file_llseek, | |
2516 | }; | |
2517 | ||
449543b0 RK |
2518 | /** |
2519 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2520 | * @file: file pointer | |
2521 | * @buf: data from user space | |
2522 | * @count: bytes sent | |
2523 | * @ppos: where to start - must be 0 | |
2524 | */ | |
2525 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2526 | size_t count, loff_t *ppos) | |
2527 | { | |
54302094 DC |
2528 | char *data; |
2529 | const char *cp; | |
449543b0 RK |
2530 | struct smack_known *skp; |
2531 | struct smack_rule *sp; | |
2532 | struct list_head *rule_list; | |
2533 | struct mutex *rule_lock; | |
2534 | int rc = count; | |
2535 | ||
2536 | if (*ppos != 0) | |
2537 | return -EINVAL; | |
2538 | ||
2539 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2540 | return -EPERM; | |
2541 | ||
2542 | if (count == 0 || count > SMK_LONGLABEL) | |
2543 | return -EINVAL; | |
2544 | ||
2545 | data = kzalloc(count, GFP_KERNEL); | |
2546 | if (data == NULL) | |
2547 | return -ENOMEM; | |
2548 | ||
2549 | if (copy_from_user(data, buf, count) != 0) { | |
2550 | rc = -EFAULT; | |
54302094 | 2551 | goto out_data; |
449543b0 RK |
2552 | } |
2553 | ||
2554 | cp = smk_parse_smack(data, count); | |
e774ad68 LP |
2555 | if (IS_ERR(cp)) { |
2556 | rc = PTR_ERR(cp); | |
54302094 | 2557 | goto out_data; |
449543b0 RK |
2558 | } |
2559 | ||
2560 | skp = smk_find_entry(cp); | |
d15d9fad | 2561 | if (skp == NULL) |
54302094 | 2562 | goto out_cp; |
449543b0 RK |
2563 | |
2564 | rule_list = &skp->smk_rules; | |
2565 | rule_lock = &skp->smk_rules_lock; | |
2566 | ||
2567 | mutex_lock(rule_lock); | |
2568 | ||
2569 | list_for_each_entry_rcu(sp, rule_list, list) | |
2570 | sp->smk_access = 0; | |
2571 | ||
2572 | mutex_unlock(rule_lock); | |
2573 | ||
54302094 | 2574 | out_cp: |
449543b0 | 2575 | kfree(cp); |
54302094 DC |
2576 | out_data: |
2577 | kfree(data); | |
2578 | ||
449543b0 RK |
2579 | return rc; |
2580 | } | |
2581 | ||
2582 | static const struct file_operations smk_revoke_subj_ops = { | |
2583 | .write = smk_write_revoke_subj, | |
2584 | .read = simple_transaction_read, | |
2585 | .release = simple_transaction_release, | |
2586 | .llseek = generic_file_llseek, | |
2587 | }; | |
2588 | ||
e9307237 CS |
2589 | /** |
2590 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2591 | * | |
2592 | */ | |
2593 | static int smk_init_sysfs(void) | |
2594 | { | |
ca70d27e | 2595 | return sysfs_create_mount_point(fs_kobj, "smackfs"); |
e9307237 CS |
2596 | } |
2597 | ||
e05b6f98 RK |
2598 | /** |
2599 | * smk_write_change_rule - write() for /smack/change-rule | |
2600 | * @file: file pointer | |
2601 | * @buf: data from user space | |
2602 | * @count: bytes sent | |
2603 | * @ppos: where to start - must be 0 | |
2604 | */ | |
2605 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2606 | size_t count, loff_t *ppos) | |
2607 | { | |
2608 | /* | |
2609 | * Must have privilege. | |
2610 | */ | |
4afde48b | 2611 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e05b6f98 RK |
2612 | return -EPERM; |
2613 | ||
2614 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2615 | SMK_CHANGE_FMT); | |
2616 | } | |
2617 | ||
2618 | static const struct file_operations smk_change_rule_ops = { | |
2619 | .write = smk_write_change_rule, | |
2620 | .read = simple_transaction_read, | |
2621 | .release = simple_transaction_release, | |
2622 | .llseek = generic_file_llseek, | |
2623 | }; | |
2624 | ||
e114e473 | 2625 | /** |
00f84f3f CS |
2626 | * smk_read_syslog - read() for smackfs/syslog |
2627 | * @filp: file pointer, not actually used | |
2628 | * @buf: where to put the result | |
2629 | * @cn: maximum to send along | |
2630 | * @ppos: where to start | |
2631 | * | |
2632 | * Returns number of bytes read or error code, as appropriate | |
2633 | */ | |
2634 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, | |
2635 | size_t cn, loff_t *ppos) | |
2636 | { | |
2637 | struct smack_known *skp; | |
2638 | ssize_t rc = -EINVAL; | |
2639 | int asize; | |
2640 | ||
2641 | if (*ppos != 0) | |
2642 | return 0; | |
2643 | ||
2644 | if (smack_syslog_label == NULL) | |
2645 | skp = &smack_known_star; | |
2646 | else | |
2647 | skp = smack_syslog_label; | |
2648 | ||
2649 | asize = strlen(skp->smk_known) + 1; | |
2650 | ||
2651 | if (cn >= asize) | |
2652 | rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, | |
2653 | asize); | |
2654 | ||
2655 | return rc; | |
2656 | } | |
2657 | ||
2658 | /** | |
2659 | * smk_write_syslog - write() for smackfs/syslog | |
2660 | * @file: file pointer, not actually used | |
2661 | * @buf: where to get the data from | |
2662 | * @count: bytes sent | |
2663 | * @ppos: where to start | |
2664 | * | |
2665 | * Returns number of bytes written or error code, as appropriate | |
2666 | */ | |
2667 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, | |
2668 | size_t count, loff_t *ppos) | |
2669 | { | |
2670 | char *data; | |
2671 | struct smack_known *skp; | |
2672 | int rc = count; | |
2673 | ||
2674 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2675 | return -EPERM; | |
2676 | ||
b862e561 | 2677 | data = kzalloc(count + 1, GFP_KERNEL); |
00f84f3f CS |
2678 | if (data == NULL) |
2679 | return -ENOMEM; | |
2680 | ||
2681 | if (copy_from_user(data, buf, count) != 0) | |
2682 | rc = -EFAULT; | |
2683 | else { | |
2684 | skp = smk_import_entry(data, count); | |
e774ad68 LP |
2685 | if (IS_ERR(skp)) |
2686 | rc = PTR_ERR(skp); | |
00f84f3f | 2687 | else |
e774ad68 | 2688 | smack_syslog_label = skp; |
00f84f3f CS |
2689 | } |
2690 | ||
2691 | kfree(data); | |
2692 | return rc; | |
2693 | } | |
2694 | ||
2695 | static const struct file_operations smk_syslog_ops = { | |
2696 | .read = smk_read_syslog, | |
2697 | .write = smk_write_syslog, | |
2698 | .llseek = default_llseek, | |
2699 | }; | |
2700 | ||
2701 | ||
66867818 LP |
2702 | /** |
2703 | * smk_read_ptrace - read() for /smack/ptrace | |
2704 | * @filp: file pointer, not actually used | |
2705 | * @buf: where to put the result | |
2706 | * @count: maximum to send along | |
2707 | * @ppos: where to start | |
2708 | * | |
2709 | * Returns number of bytes read or error code, as appropriate | |
2710 | */ | |
2711 | static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, | |
2712 | size_t count, loff_t *ppos) | |
2713 | { | |
2714 | char temp[32]; | |
2715 | ssize_t rc; | |
2716 | ||
2717 | if (*ppos != 0) | |
2718 | return 0; | |
2719 | ||
2720 | sprintf(temp, "%d\n", smack_ptrace_rule); | |
2721 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2722 | return rc; | |
2723 | } | |
2724 | ||
2725 | /** | |
2726 | * smk_write_ptrace - write() for /smack/ptrace | |
2727 | * @file: file pointer | |
2728 | * @buf: data from user space | |
2729 | * @count: bytes sent | |
2730 | * @ppos: where to start - must be 0 | |
2731 | */ | |
2732 | static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, | |
2733 | size_t count, loff_t *ppos) | |
2734 | { | |
2735 | char temp[32]; | |
2736 | int i; | |
2737 | ||
2738 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2739 | return -EPERM; | |
2740 | ||
2741 | if (*ppos != 0 || count >= sizeof(temp) || count == 0) | |
2742 | return -EINVAL; | |
2743 | ||
2744 | if (copy_from_user(temp, buf, count) != 0) | |
2745 | return -EFAULT; | |
2746 | ||
2747 | temp[count] = '\0'; | |
2748 | ||
2749 | if (sscanf(temp, "%d", &i) != 1) | |
2750 | return -EINVAL; | |
2751 | if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) | |
2752 | return -EINVAL; | |
2753 | smack_ptrace_rule = i; | |
2754 | ||
2755 | return count; | |
2756 | } | |
2757 | ||
2758 | static const struct file_operations smk_ptrace_ops = { | |
2759 | .write = smk_write_ptrace, | |
2760 | .read = smk_read_ptrace, | |
2761 | .llseek = default_llseek, | |
2762 | }; | |
2763 | ||
00f84f3f CS |
2764 | /** |
2765 | * smk_fill_super - fill the smackfs superblock | |
e114e473 CS |
2766 | * @sb: the empty superblock |
2767 | * @data: unused | |
2768 | * @silent: unused | |
2769 | * | |
00f84f3f | 2770 | * Fill in the well known entries for the smack filesystem |
e114e473 CS |
2771 | * |
2772 | * Returns 0 on success, an error code on failure | |
2773 | */ | |
2774 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2775 | { | |
2776 | int rc; | |
2777 | struct inode *root_inode; | |
2778 | ||
2779 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
2780 | [SMK_LOAD] = { |
2781 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2782 | [SMK_CIPSO] = { | |
2783 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2784 | [SMK_DOI] = { | |
2785 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2786 | [SMK_DIRECT] = { | |
2787 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2788 | [SMK_AMBIENT] = { | |
2789 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
21abb1ec CS |
2790 | [SMK_NET4ADDR] = { |
2791 | "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2792 | [SMK_ONLYCAP] = { |
2793 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2794 | [SMK_LOGGING] = { | |
2795 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2796 | [SMK_LOAD_SELF] = { | |
2797 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2798 | [SMK_ACCESSES] = { |
0e94ae17 | 2799 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2800 | [SMK_MAPPED] = { |
2801 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2802 | [SMK_LOAD2] = { | |
2803 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2804 | [SMK_LOAD_SELF2] = { | |
2805 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2806 | [SMK_ACCESS2] = { | |
2807 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2808 | [SMK_CIPSO2] = { | |
2809 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2810 | [SMK_REVOKE_SUBJ] = { |
2811 | "revoke-subject", &smk_revoke_subj_ops, | |
2812 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2813 | [SMK_CHANGE_RULE] = { |
2814 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
00f84f3f CS |
2815 | [SMK_SYSLOG] = { |
2816 | "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, | |
66867818 LP |
2817 | [SMK_PTRACE] = { |
2818 | "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, | |
bf4b2fee CS |
2819 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2820 | [SMK_UNCONFINED] = { | |
2821 | "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, | |
2822 | #endif | |
21abb1ec CS |
2823 | #if IS_ENABLED(CONFIG_IPV6) |
2824 | [SMK_NET6ADDR] = { | |
2825 | "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR}, | |
2826 | #endif /* CONFIG_IPV6 */ | |
7898e1f8 CS |
2827 | /* last one */ |
2828 | {""} | |
e114e473 CS |
2829 | }; |
2830 | ||
2831 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2832 | if (rc != 0) { | |
2833 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2834 | __func__, rc); | |
2835 | return rc; | |
2836 | } | |
2837 | ||
ce0b16dd | 2838 | root_inode = d_inode(sb->s_root); |
e114e473 CS |
2839 | |
2840 | return 0; | |
2841 | } | |
2842 | ||
2843 | /** | |
fc14f2fe | 2844 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2845 | * @fs_type: passed along without comment |
2846 | * @flags: passed along without comment | |
2847 | * @dev_name: passed along without comment | |
2848 | * @data: passed along without comment | |
e114e473 CS |
2849 | * |
2850 | * Just passes everything along. | |
2851 | * | |
2852 | * Returns what the lower level code does. | |
2853 | */ | |
fc14f2fe AV |
2854 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2855 | int flags, const char *dev_name, void *data) | |
e114e473 | 2856 | { |
fc14f2fe | 2857 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2858 | } |
2859 | ||
2860 | static struct file_system_type smk_fs_type = { | |
2861 | .name = "smackfs", | |
fc14f2fe | 2862 | .mount = smk_mount, |
e114e473 CS |
2863 | .kill_sb = kill_litter_super, |
2864 | }; | |
2865 | ||
2866 | static struct vfsmount *smackfs_mount; | |
2867 | ||
f7112e6c CS |
2868 | static int __init smk_preset_netlabel(struct smack_known *skp) |
2869 | { | |
2870 | skp->smk_netlabel.domain = skp->smk_known; | |
2871 | skp->smk_netlabel.flags = | |
2872 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
2873 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
2874 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
2875 | } | |
2876 | ||
e114e473 CS |
2877 | /** |
2878 | * init_smk_fs - get the smackfs superblock | |
2879 | * | |
2880 | * register the smackfs | |
2881 | * | |
076c54c5 AD |
2882 | * Do not register smackfs if Smack wasn't enabled |
2883 | * on boot. We can not put this method normally under the | |
2884 | * smack_init() code path since the security subsystem get | |
2885 | * initialized before the vfs caches. | |
2886 | * | |
2887 | * Returns true if we were not chosen on boot or if | |
2888 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2889 | */ |
2890 | static int __init init_smk_fs(void) | |
2891 | { | |
2892 | int err; | |
f7112e6c | 2893 | int rc; |
e114e473 | 2894 | |
b1d9e6b0 | 2895 | if (!security_module_enable("smack")) |
076c54c5 AD |
2896 | return 0; |
2897 | ||
e9307237 CS |
2898 | err = smk_init_sysfs(); |
2899 | if (err) | |
2900 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
2901 | ||
e114e473 CS |
2902 | err = register_filesystem(&smk_fs_type); |
2903 | if (!err) { | |
2904 | smackfs_mount = kern_mount(&smk_fs_type); | |
2905 | if (IS_ERR(smackfs_mount)) { | |
2906 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
2907 | err = PTR_ERR(smackfs_mount); | |
2908 | smackfs_mount = NULL; | |
2909 | } | |
2910 | } | |
2911 | ||
e114e473 | 2912 | smk_cipso_doi(); |
4bc87e62 | 2913 | smk_unlbl_ambient(NULL); |
e114e473 | 2914 | |
f7112e6c CS |
2915 | rc = smk_preset_netlabel(&smack_known_floor); |
2916 | if (err == 0 && rc < 0) | |
2917 | err = rc; | |
2918 | rc = smk_preset_netlabel(&smack_known_hat); | |
2919 | if (err == 0 && rc < 0) | |
2920 | err = rc; | |
2921 | rc = smk_preset_netlabel(&smack_known_huh); | |
2922 | if (err == 0 && rc < 0) | |
2923 | err = rc; | |
2924 | rc = smk_preset_netlabel(&smack_known_invalid); | |
2925 | if (err == 0 && rc < 0) | |
2926 | err = rc; | |
2927 | rc = smk_preset_netlabel(&smack_known_star); | |
2928 | if (err == 0 && rc < 0) | |
2929 | err = rc; | |
2930 | rc = smk_preset_netlabel(&smack_known_web); | |
2931 | if (err == 0 && rc < 0) | |
2932 | err = rc; | |
2933 | ||
e114e473 CS |
2934 | return err; |
2935 | } | |
2936 | ||
2937 | __initcall(init_smk_fs); |