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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 */ | |
38416e53 | 64 | SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */ |
e114e473 CS |
65 | }; |
66 | ||
67 | /* | |
68 | * List locks | |
69 | */ | |
2e962e2f | 70 | static DEFINE_MUTEX(smack_master_list_lock); |
e114e473 | 71 | static DEFINE_MUTEX(smack_cipso_lock); |
4bc87e62 | 72 | static DEFINE_MUTEX(smack_ambient_lock); |
21abb1ec CS |
73 | static DEFINE_MUTEX(smk_net4addr_lock); |
74 | #if IS_ENABLED(CONFIG_IPV6) | |
75 | static DEFINE_MUTEX(smk_net6addr_lock); | |
76 | #endif /* CONFIG_IPV6 */ | |
e114e473 CS |
77 | |
78 | /* | |
79 | * This is the "ambient" label for network traffic. | |
80 | * If it isn't somehow marked, use this. | |
81 | * It can be reset via smackfs/ambient | |
82 | */ | |
2f823ff8 | 83 | struct smack_known *smack_net_ambient; |
e114e473 | 84 | |
e114e473 CS |
85 | /* |
86 | * This is the level in a CIPSO header that indicates a | |
87 | * smack label is contained directly in the category set. | |
88 | * It can be reset via smackfs/direct | |
89 | */ | |
90 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
91 | ||
f7112e6c CS |
92 | /* |
93 | * This is the level in a CIPSO header that indicates a | |
94 | * secid is contained directly in the category set. | |
95 | * It can be reset via smackfs/mapped | |
96 | */ | |
97 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; | |
98 | ||
bf4b2fee CS |
99 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
100 | /* | |
101 | * Allow one label to be unconfined. This is for | |
102 | * debugging and application bring-up purposes only. | |
103 | * It is bad and wrong, but everyone seems to expect | |
104 | * to have it. | |
105 | */ | |
106 | struct smack_known *smack_unconfined; | |
107 | #endif | |
108 | ||
00f84f3f CS |
109 | /* |
110 | * If this value is set restrict syslog use to the label specified. | |
111 | * It can be reset via smackfs/syslog | |
112 | */ | |
113 | struct smack_known *smack_syslog_label; | |
15446235 | 114 | |
66867818 LP |
115 | /* |
116 | * Ptrace current rule | |
117 | * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) | |
118 | * SMACK_PTRACE_EXACT labels must match, but can be overriden with | |
119 | * CAP_SYS_PTRACE | |
120 | * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect | |
121 | */ | |
122 | int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; | |
123 | ||
6d3dc07c CS |
124 | /* |
125 | * Certain IP addresses may be designated as single label hosts. | |
126 | * Packets are sent there unlabeled, but only from tasks that | |
127 | * can write to the specified label. | |
128 | */ | |
7198e2ee | 129 | |
21abb1ec CS |
130 | LIST_HEAD(smk_net4addr_list); |
131 | #if IS_ENABLED(CONFIG_IPV6) | |
132 | LIST_HEAD(smk_net6addr_list); | |
133 | #endif /* CONFIG_IPV6 */ | |
272cd7a8 CS |
134 | |
135 | /* | |
136 | * Rule lists are maintained for each label. | |
f7112e6c | 137 | * This master list is just for reading /smack/load and /smack/load2. |
272cd7a8 CS |
138 | */ |
139 | struct smack_master_list { | |
140 | struct list_head list; | |
141 | struct smack_rule *smk_rule; | |
142 | }; | |
143 | ||
1eddfe8e | 144 | static LIST_HEAD(smack_rule_list); |
6d3dc07c | 145 | |
e05b6f98 | 146 | struct smack_parsed_rule { |
2f823ff8 | 147 | struct smack_known *smk_subject; |
21c7eae2 | 148 | struct smack_known *smk_object; |
e05b6f98 RK |
149 | int smk_access1; |
150 | int smk_access2; | |
151 | }; | |
152 | ||
e114e473 | 153 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 154 | |
e114e473 CS |
155 | /* |
156 | * Values for parsing cipso rules | |
157 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
158 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
159 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
160 | */ |
161 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
162 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
163 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
164 | ||
165 | /* | |
166 | * Values for parsing MAC rules | |
167 | * SMK_ACCESS: Maximum possible combination of access permissions | |
168 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
169 | * SMK_LOADLEN: Smack rule length | |
170 | */ | |
5c6d1125 | 171 | #define SMK_OACCESS "rwxa" |
c0ab6e56 | 172 | #define SMK_ACCESS "rwxatl" |
5c6d1125 JS |
173 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
174 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
175 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
176 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 177 | |
f7112e6c CS |
178 | /* |
179 | * Stricly for CIPSO level manipulation. | |
180 | * Set the category bit number in a smack label sized buffer. | |
181 | */ | |
182 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) | |
183 | { | |
184 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) | |
185 | return; | |
186 | ||
187 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
188 | } | |
189 | ||
6d3dc07c CS |
190 | /** |
191 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
192 | * @nap: structure to fill | |
193 | */ | |
194 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
195 | { | |
2f823ff8 CS |
196 | struct smack_known *skp = smk_of_current(); |
197 | ||
6d3dc07c CS |
198 | nap->loginuid = audit_get_loginuid(current); |
199 | nap->sessionid = audit_get_sessionid(current); | |
2f823ff8 | 200 | nap->secid = skp->smk_secid; |
6d3dc07c CS |
201 | } |
202 | ||
203 | /* | |
f7112e6c | 204 | * Value for parsing single label host rules |
6d3dc07c | 205 | * "1.2.3.4 X" |
6d3dc07c CS |
206 | */ |
207 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 208 | |
e114e473 | 209 | /** |
e05b6f98 RK |
210 | * smk_set_access - add a rule to the rule list or replace an old rule |
211 | * @srp: the rule to add or replace | |
7898e1f8 CS |
212 | * @rule_list: the list of rules |
213 | * @rule_lock: the rule list lock | |
e05b6f98 | 214 | * @global: if non-zero, indicates a global rule |
e114e473 CS |
215 | * |
216 | * Looks through the current subject/object/access list for | |
217 | * the subject/object pair and replaces the access that was | |
218 | * there. If the pair isn't found add it with the specified | |
219 | * access. | |
81ea714b SL |
220 | * |
221 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
222 | * during the allocation of the new pair to add. | |
e114e473 | 223 | */ |
e05b6f98 RK |
224 | static int smk_set_access(struct smack_parsed_rule *srp, |
225 | struct list_head *rule_list, | |
226 | struct mutex *rule_lock, int global) | |
e114e473 | 227 | { |
7198e2ee | 228 | struct smack_rule *sp; |
e05b6f98 | 229 | struct smack_master_list *smlp; |
7898e1f8 | 230 | int found = 0; |
e05b6f98 | 231 | int rc = 0; |
e114e473 | 232 | |
7898e1f8 CS |
233 | mutex_lock(rule_lock); |
234 | ||
272cd7a8 CS |
235 | /* |
236 | * Because the object label is less likely to match | |
237 | * than the subject label check it first | |
238 | */ | |
7898e1f8 | 239 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
240 | if (sp->smk_object == srp->smk_object && |
241 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee | 242 | found = 1; |
e05b6f98 RK |
243 | sp->smk_access |= srp->smk_access1; |
244 | sp->smk_access &= ~srp->smk_access2; | |
e114e473 CS |
245 | break; |
246 | } | |
e114e473 CS |
247 | } |
248 | ||
e05b6f98 RK |
249 | if (found == 0) { |
250 | sp = kzalloc(sizeof(*sp), GFP_KERNEL); | |
251 | if (sp == NULL) { | |
252 | rc = -ENOMEM; | |
253 | goto out; | |
254 | } | |
255 | ||
256 | sp->smk_subject = srp->smk_subject; | |
257 | sp->smk_object = srp->smk_object; | |
258 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; | |
259 | ||
260 | list_add_rcu(&sp->list, rule_list); | |
261 | /* | |
262 | * If this is a global as opposed to self and a new rule | |
263 | * it needs to get added for reporting. | |
264 | */ | |
265 | if (global) { | |
2e962e2f | 266 | mutex_unlock(rule_lock); |
e05b6f98 RK |
267 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); |
268 | if (smlp != NULL) { | |
269 | smlp->smk_rule = sp; | |
2e962e2f | 270 | mutex_lock(&smack_master_list_lock); |
e05b6f98 | 271 | list_add_rcu(&smlp->list, &smack_rule_list); |
2e962e2f | 272 | mutex_unlock(&smack_master_list_lock); |
e05b6f98 RK |
273 | } else |
274 | rc = -ENOMEM; | |
2e962e2f | 275 | return rc; |
e05b6f98 RK |
276 | } |
277 | } | |
278 | ||
279 | out: | |
7898e1f8 | 280 | mutex_unlock(rule_lock); |
e05b6f98 RK |
281 | return rc; |
282 | } | |
283 | ||
284 | /** | |
285 | * smk_perm_from_str - parse smack accesses from a text string | |
286 | * @string: a text string that contains a Smack accesses code | |
287 | * | |
288 | * Returns an integer with respective bits set for specified accesses. | |
289 | */ | |
290 | static int smk_perm_from_str(const char *string) | |
291 | { | |
292 | int perm = 0; | |
293 | const char *cp; | |
e114e473 | 294 | |
e05b6f98 RK |
295 | for (cp = string; ; cp++) |
296 | switch (*cp) { | |
297 | case '-': | |
298 | break; | |
299 | case 'r': | |
300 | case 'R': | |
301 | perm |= MAY_READ; | |
302 | break; | |
303 | case 'w': | |
304 | case 'W': | |
305 | perm |= MAY_WRITE; | |
306 | break; | |
307 | case 'x': | |
308 | case 'X': | |
309 | perm |= MAY_EXEC; | |
310 | break; | |
311 | case 'a': | |
312 | case 'A': | |
313 | perm |= MAY_APPEND; | |
314 | break; | |
315 | case 't': | |
316 | case 'T': | |
317 | perm |= MAY_TRANSMUTE; | |
318 | break; | |
c0ab6e56 CS |
319 | case 'l': |
320 | case 'L': | |
321 | perm |= MAY_LOCK; | |
322 | break; | |
d166c802 CS |
323 | case 'b': |
324 | case 'B': | |
325 | perm |= MAY_BRINGUP; | |
326 | break; | |
e05b6f98 RK |
327 | default: |
328 | return perm; | |
329 | } | |
e114e473 CS |
330 | } |
331 | ||
332 | /** | |
f7112e6c CS |
333 | * smk_fill_rule - Fill Smack rule from strings |
334 | * @subject: subject label string | |
335 | * @object: object label string | |
e05b6f98 RK |
336 | * @access1: access string |
337 | * @access2: string with permissions to be removed | |
0e94ae17 JS |
338 | * @rule: Smack rule |
339 | * @import: if non-zero, import labels | |
3518721a | 340 | * @len: label length limit |
f7112e6c | 341 | * |
e774ad68 | 342 | * Returns 0 on success, appropriate error code on failure. |
e114e473 | 343 | */ |
f7112e6c | 344 | static int smk_fill_rule(const char *subject, const char *object, |
e05b6f98 RK |
345 | const char *access1, const char *access2, |
346 | struct smack_parsed_rule *rule, int import, | |
347 | int len) | |
e114e473 | 348 | { |
f7112e6c | 349 | const char *cp; |
0e94ae17 | 350 | struct smack_known *skp; |
e114e473 | 351 | |
0e94ae17 | 352 | if (import) { |
2f823ff8 | 353 | rule->smk_subject = smk_import_entry(subject, len); |
e774ad68 LP |
354 | if (IS_ERR(rule->smk_subject)) |
355 | return PTR_ERR(rule->smk_subject); | |
0e94ae17 | 356 | |
21c7eae2 | 357 | rule->smk_object = smk_import_entry(object, len); |
e774ad68 LP |
358 | if (IS_ERR(rule->smk_object)) |
359 | return PTR_ERR(rule->smk_object); | |
0e94ae17 | 360 | } else { |
3518721a | 361 | cp = smk_parse_smack(subject, len); |
e774ad68 LP |
362 | if (IS_ERR(cp)) |
363 | return PTR_ERR(cp); | |
f7112e6c CS |
364 | skp = smk_find_entry(cp); |
365 | kfree(cp); | |
0e94ae17 | 366 | if (skp == NULL) |
398ce073 | 367 | return -ENOENT; |
2f823ff8 | 368 | rule->smk_subject = skp; |
0e94ae17 | 369 | |
3518721a | 370 | cp = smk_parse_smack(object, len); |
e774ad68 LP |
371 | if (IS_ERR(cp)) |
372 | return PTR_ERR(cp); | |
f7112e6c CS |
373 | skp = smk_find_entry(cp); |
374 | kfree(cp); | |
0e94ae17 | 375 | if (skp == NULL) |
398ce073 | 376 | return -ENOENT; |
21c7eae2 | 377 | rule->smk_object = skp; |
0e94ae17 | 378 | } |
7198e2ee | 379 | |
e05b6f98 RK |
380 | rule->smk_access1 = smk_perm_from_str(access1); |
381 | if (access2) | |
382 | rule->smk_access2 = smk_perm_from_str(access2); | |
383 | else | |
384 | rule->smk_access2 = ~rule->smk_access1; | |
e114e473 | 385 | |
3518721a | 386 | return 0; |
f7112e6c | 387 | } |
e114e473 | 388 | |
f7112e6c CS |
389 | /** |
390 | * smk_parse_rule - parse Smack rule from load string | |
391 | * @data: string to be parsed whose size is SMK_LOADLEN | |
392 | * @rule: Smack rule | |
393 | * @import: if non-zero, import labels | |
394 | * | |
395 | * Returns 0 on success, -1 on errors. | |
396 | */ | |
e05b6f98 RK |
397 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
398 | int import) | |
f7112e6c CS |
399 | { |
400 | int rc; | |
e114e473 | 401 | |
f7112e6c | 402 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
e05b6f98 RK |
403 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
404 | import, SMK_LABELLEN); | |
f7112e6c CS |
405 | return rc; |
406 | } | |
e114e473 | 407 | |
f7112e6c CS |
408 | /** |
409 | * smk_parse_long_rule - parse Smack rule from rule string | |
410 | * @data: string to be parsed, null terminated | |
e05b6f98 | 411 | * @rule: Will be filled with Smack parsed rule |
f7112e6c | 412 | * @import: if non-zero, import labels |
10289b0f | 413 | * @tokens: numer of substrings expected in data |
f7112e6c | 414 | * |
e774ad68 | 415 | * Returns number of processed bytes on success, -ERRNO on failure. |
f7112e6c | 416 | */ |
10289b0f RK |
417 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
418 | int import, int tokens) | |
f7112e6c | 419 | { |
10289b0f RK |
420 | ssize_t cnt = 0; |
421 | char *tok[4]; | |
398ce073 | 422 | int rc; |
10289b0f RK |
423 | int i; |
424 | ||
425 | /* | |
426 | * Parsing the rule in-place, filling all white-spaces with '\0' | |
427 | */ | |
428 | for (i = 0; i < tokens; ++i) { | |
429 | while (isspace(data[cnt])) | |
430 | data[cnt++] = '\0'; | |
431 | ||
432 | if (data[cnt] == '\0') | |
433 | /* Unexpected end of data */ | |
e774ad68 | 434 | return -EINVAL; |
10289b0f RK |
435 | |
436 | tok[i] = data + cnt; | |
437 | ||
438 | while (data[cnt] && !isspace(data[cnt])) | |
439 | ++cnt; | |
e05b6f98 | 440 | } |
10289b0f RK |
441 | while (isspace(data[cnt])) |
442 | data[cnt++] = '\0'; | |
f7112e6c | 443 | |
10289b0f RK |
444 | while (i < 4) |
445 | tok[i++] = NULL; | |
446 | ||
398ce073 JS |
447 | rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
448 | return rc == 0 ? cnt : rc; | |
828716c2 JS |
449 | } |
450 | ||
f7112e6c CS |
451 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
452 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
e05b6f98 | 453 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
828716c2 | 454 | /** |
f7112e6c | 455 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
456 | * @file: file pointer, not actually used |
457 | * @buf: where to get the data from | |
458 | * @count: bytes sent | |
459 | * @ppos: where to start - must be 0 | |
460 | * @rule_list: the list of rules to write to | |
461 | * @rule_lock: lock for the rule list | |
e05b6f98 | 462 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 JS |
463 | * |
464 | * Get one smack access rule from above. | |
f7112e6c CS |
465 | * The format for SMK_LONG_FMT is: |
466 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
467 | * The format for SMK_FIXED24_FMT is exactly: | |
468 | * "subject object rwxat" | |
e05b6f98 RK |
469 | * The format for SMK_CHANGE_FMT is: |
470 | * "subject<whitespace>object<whitespace> | |
471 | * acc_enable<whitespace>acc_disable[<whitespace>...]" | |
828716c2 | 472 | */ |
f7112e6c CS |
473 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
474 | size_t count, loff_t *ppos, | |
475 | struct list_head *rule_list, | |
476 | struct mutex *rule_lock, int format) | |
828716c2 | 477 | { |
470043ba | 478 | struct smack_parsed_rule rule; |
828716c2 | 479 | char *data; |
10289b0f RK |
480 | int rc; |
481 | int trunc = 0; | |
482 | int tokens; | |
483 | ssize_t cnt = 0; | |
828716c2 JS |
484 | |
485 | /* | |
486 | * No partial writes. | |
487 | * Enough data must be present. | |
488 | */ | |
489 | if (*ppos != 0) | |
490 | return -EINVAL; | |
828716c2 | 491 | |
f7112e6c CS |
492 | if (format == SMK_FIXED24_FMT) { |
493 | /* | |
494 | * Minor hack for backward compatibility | |
495 | */ | |
c0ab6e56 | 496 | if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
f7112e6c | 497 | return -EINVAL; |
10289b0f RK |
498 | } else { |
499 | if (count >= PAGE_SIZE) { | |
500 | count = PAGE_SIZE - 1; | |
501 | trunc = 1; | |
502 | } | |
503 | } | |
f7112e6c | 504 | |
16e5c1fc AV |
505 | data = memdup_user_nul(buf, count); |
506 | if (IS_ERR(data)) | |
507 | return PTR_ERR(data); | |
828716c2 | 508 | |
10289b0f RK |
509 | /* |
510 | * In case of parsing only part of user buf, | |
511 | * avoid having partial rule at the data buffer | |
512 | */ | |
513 | if (trunc) { | |
514 | while (count > 0 && (data[count - 1] != '\n')) | |
515 | --count; | |
516 | if (count == 0) { | |
517 | rc = -EINVAL; | |
470043ba | 518 | goto out; |
10289b0f | 519 | } |
f7112e6c CS |
520 | } |
521 | ||
10289b0f RK |
522 | data[count] = '\0'; |
523 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); | |
524 | while (cnt < count) { | |
525 | if (format == SMK_FIXED24_FMT) { | |
526 | rc = smk_parse_rule(data, &rule, 1); | |
e774ad68 | 527 | if (rc < 0) |
10289b0f | 528 | goto out; |
10289b0f RK |
529 | cnt = count; |
530 | } else { | |
531 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); | |
e774ad68 LP |
532 | if (rc < 0) |
533 | goto out; | |
534 | if (rc == 0) { | |
10289b0f RK |
535 | rc = -EINVAL; |
536 | goto out; | |
537 | } | |
538 | cnt += rc; | |
539 | } | |
540 | ||
541 | if (rule_list == NULL) | |
542 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, | |
543 | &rule.smk_subject->smk_rules_lock, 1); | |
544 | else | |
545 | rc = smk_set_access(&rule, rule_list, rule_lock, 0); | |
546 | ||
547 | if (rc) | |
548 | goto out; | |
272cd7a8 CS |
549 | } |
550 | ||
10289b0f | 551 | rc = cnt; |
e114e473 CS |
552 | out: |
553 | kfree(data); | |
554 | return rc; | |
555 | } | |
556 | ||
7898e1f8 | 557 | /* |
40809565 | 558 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
559 | */ |
560 | ||
40809565 CS |
561 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
562 | struct list_head *head) | |
7898e1f8 | 563 | { |
272cd7a8 | 564 | struct list_head *list; |
01fa8474 RK |
565 | int i = *pos; |
566 | ||
567 | rcu_read_lock(); | |
568 | for (list = rcu_dereference(list_next_rcu(head)); | |
569 | list != head; | |
570 | list = rcu_dereference(list_next_rcu(list))) { | |
571 | if (i-- == 0) | |
572 | return list; | |
573 | } | |
272cd7a8 | 574 | |
01fa8474 | 575 | return NULL; |
7898e1f8 CS |
576 | } |
577 | ||
40809565 CS |
578 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
579 | struct list_head *head) | |
7898e1f8 CS |
580 | { |
581 | struct list_head *list = v; | |
582 | ||
01fa8474 RK |
583 | ++*pos; |
584 | list = rcu_dereference(list_next_rcu(list)); | |
585 | ||
586 | return (list == head) ? NULL : list; | |
7898e1f8 CS |
587 | } |
588 | ||
40809565 CS |
589 | static void smk_seq_stop(struct seq_file *s, void *v) |
590 | { | |
01fa8474 | 591 | rcu_read_unlock(); |
40809565 CS |
592 | } |
593 | ||
f7112e6c | 594 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 595 | { |
f7112e6c CS |
596 | /* |
597 | * Don't show any rules with label names too long for | |
598 | * interface file (/smack/load or /smack/load2) | |
599 | * because you should expect to be able to write | |
600 | * anything you read back. | |
601 | */ | |
2f823ff8 | 602 | if (strlen(srp->smk_subject->smk_known) >= max || |
21c7eae2 | 603 | strlen(srp->smk_object->smk_known) >= max) |
f7112e6c | 604 | return; |
7898e1f8 | 605 | |
65ee7f45 RK |
606 | if (srp->smk_access == 0) |
607 | return; | |
608 | ||
21c7eae2 LP |
609 | seq_printf(s, "%s %s", |
610 | srp->smk_subject->smk_known, | |
611 | srp->smk_object->smk_known); | |
7898e1f8 CS |
612 | |
613 | seq_putc(s, ' '); | |
614 | ||
615 | if (srp->smk_access & MAY_READ) | |
616 | seq_putc(s, 'r'); | |
617 | if (srp->smk_access & MAY_WRITE) | |
618 | seq_putc(s, 'w'); | |
619 | if (srp->smk_access & MAY_EXEC) | |
620 | seq_putc(s, 'x'); | |
621 | if (srp->smk_access & MAY_APPEND) | |
622 | seq_putc(s, 'a'); | |
623 | if (srp->smk_access & MAY_TRANSMUTE) | |
624 | seq_putc(s, 't'); | |
c0ab6e56 CS |
625 | if (srp->smk_access & MAY_LOCK) |
626 | seq_putc(s, 'l'); | |
d166c802 CS |
627 | if (srp->smk_access & MAY_BRINGUP) |
628 | seq_putc(s, 'b'); | |
7898e1f8 CS |
629 | |
630 | seq_putc(s, '\n'); | |
f7112e6c CS |
631 | } |
632 | ||
633 | /* | |
634 | * Seq_file read operations for /smack/load | |
635 | */ | |
636 | ||
637 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
638 | { | |
639 | return smk_seq_start(s, pos, &smack_rule_list); | |
640 | } | |
641 | ||
642 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
643 | { | |
644 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
645 | } | |
646 | ||
647 | static int load_seq_show(struct seq_file *s, void *v) | |
648 | { | |
649 | struct list_head *list = v; | |
650 | struct smack_master_list *smlp = | |
01fa8474 | 651 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
652 | |
653 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
654 | |
655 | return 0; | |
656 | } | |
657 | ||
7898e1f8 | 658 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
659 | .start = load2_seq_start, |
660 | .next = load2_seq_next, | |
7898e1f8 | 661 | .show = load_seq_show, |
40809565 | 662 | .stop = smk_seq_stop, |
7898e1f8 CS |
663 | }; |
664 | ||
665 | /** | |
666 | * smk_open_load - open() for /smack/load | |
667 | * @inode: inode structure representing file | |
668 | * @file: "load" file pointer | |
669 | * | |
670 | * For reading, use load_seq_* seq_file reading operations. | |
671 | */ | |
672 | static int smk_open_load(struct inode *inode, struct file *file) | |
673 | { | |
674 | return seq_open(file, &load_seq_ops); | |
675 | } | |
676 | ||
677 | /** | |
678 | * smk_write_load - write() for /smack/load | |
679 | * @file: file pointer, not actually used | |
680 | * @buf: where to get the data from | |
681 | * @count: bytes sent | |
682 | * @ppos: where to start - must be 0 | |
683 | * | |
684 | */ | |
685 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
686 | size_t count, loff_t *ppos) | |
687 | { | |
7898e1f8 CS |
688 | /* |
689 | * Must have privilege. | |
690 | * No partial writes. | |
691 | * Enough data must be present. | |
692 | */ | |
1880eff7 | 693 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
694 | return -EPERM; |
695 | ||
f7112e6c CS |
696 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
697 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
698 | } |
699 | ||
e114e473 CS |
700 | static const struct file_operations smk_load_ops = { |
701 | .open = smk_open_load, | |
702 | .read = seq_read, | |
703 | .llseek = seq_lseek, | |
704 | .write = smk_write_load, | |
cb622bbb | 705 | .release = seq_release, |
e114e473 CS |
706 | }; |
707 | ||
708 | /** | |
709 | * smk_cipso_doi - initialize the CIPSO domain | |
710 | */ | |
30aa4faf | 711 | static void smk_cipso_doi(void) |
e114e473 CS |
712 | { |
713 | int rc; | |
714 | struct cipso_v4_doi *doip; | |
6d3dc07c | 715 | struct netlbl_audit nai; |
e114e473 | 716 | |
6d3dc07c | 717 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 718 | |
6d3dc07c | 719 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
720 | if (rc != 0) |
721 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
722 | __func__, __LINE__, rc); | |
723 | ||
724 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
725 | if (doip == NULL) | |
726 | panic("smack: Failed to initialize cipso DOI.\n"); | |
727 | doip->map.std = NULL; | |
728 | doip->doi = smk_cipso_doi_value; | |
729 | doip->type = CIPSO_V4_MAP_PASS; | |
730 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
731 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
732 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
733 | ||
6d3dc07c | 734 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 735 | if (rc != 0) { |
6c2e8ac0 PM |
736 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
737 | __func__, __LINE__, rc); | |
738 | kfree(doip); | |
739 | return; | |
740 | } | |
6d3dc07c | 741 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
742 | if (rc != 0) { |
743 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 744 | __func__, __LINE__, rc); |
b1edeb10 | 745 | kfree(doip); |
6c2e8ac0 | 746 | return; |
b1edeb10 | 747 | } |
e114e473 CS |
748 | } |
749 | ||
4bc87e62 CS |
750 | /** |
751 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 752 | * @oldambient: previous domain string |
4bc87e62 | 753 | */ |
30aa4faf | 754 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
755 | { |
756 | int rc; | |
6d3dc07c | 757 | struct netlbl_audit nai; |
4bc87e62 | 758 | |
6d3dc07c | 759 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
760 | |
761 | if (oldambient != NULL) { | |
6d3dc07c | 762 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
763 | if (rc != 0) |
764 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
765 | __func__, __LINE__, rc); | |
766 | } | |
f7112e6c | 767 | if (smack_net_ambient == NULL) |
2f823ff8 | 768 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 769 | |
2f823ff8 | 770 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 771 | NULL, NULL, &nai); |
4bc87e62 CS |
772 | if (rc != 0) |
773 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
774 | __func__, __LINE__, rc); | |
775 | } | |
776 | ||
e114e473 CS |
777 | /* |
778 | * Seq_file read operations for /smack/cipso | |
779 | */ | |
780 | ||
781 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
782 | { | |
40809565 | 783 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
784 | } |
785 | ||
786 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
787 | { | |
40809565 | 788 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
789 | } |
790 | ||
791 | /* | |
792 | * Print cipso labels in format: | |
793 | * label level[/cat[,cat]] | |
794 | */ | |
795 | static int cipso_seq_show(struct seq_file *s, void *v) | |
796 | { | |
7198e2ee EB |
797 | struct list_head *list = v; |
798 | struct smack_known *skp = | |
01fa8474 | 799 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 800 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 801 | char sep = '/'; |
e114e473 | 802 | int i; |
e114e473 | 803 | |
f7112e6c CS |
804 | /* |
805 | * Don't show a label that could not have been set using | |
806 | * /smack/cipso. This is in support of the notion that | |
807 | * anything read from /smack/cipso ought to be writeable | |
808 | * to /smack/cipso. | |
809 | * | |
810 | * /smack/cipso2 should be used instead. | |
811 | */ | |
812 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
813 | return 0; |
814 | ||
f7112e6c | 815 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 816 | |
4fbe63d1 PM |
817 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
818 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
819 | seq_printf(s, "%c%d", sep, i); |
820 | sep = ','; | |
821 | } | |
e114e473 CS |
822 | |
823 | seq_putc(s, '\n'); | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
88e9d34c | 828 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 829 | .start = cipso_seq_start, |
e114e473 CS |
830 | .next = cipso_seq_next, |
831 | .show = cipso_seq_show, | |
40809565 | 832 | .stop = smk_seq_stop, |
e114e473 CS |
833 | }; |
834 | ||
835 | /** | |
836 | * smk_open_cipso - open() for /smack/cipso | |
837 | * @inode: inode structure representing file | |
838 | * @file: "cipso" file pointer | |
839 | * | |
840 | * Connect our cipso_seq_* operations with /smack/cipso | |
841 | * file_operations | |
842 | */ | |
843 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
844 | { | |
845 | return seq_open(file, &cipso_seq_ops); | |
846 | } | |
847 | ||
848 | /** | |
f7112e6c | 849 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 850 | * @file: file pointer, not actually used |
e114e473 CS |
851 | * @buf: where to get the data from |
852 | * @count: bytes sent | |
853 | * @ppos: where to start | |
f7112e6c | 854 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
855 | * |
856 | * Accepts only one cipso rule per write call. | |
857 | * Returns number of bytes written or error code, as appropriate | |
858 | */ | |
f7112e6c CS |
859 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
860 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
861 | { |
862 | struct smack_known *skp; | |
f7112e6c CS |
863 | struct netlbl_lsm_secattr ncats; |
864 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 865 | int maplevel; |
f7112e6c | 866 | unsigned int cat; |
e114e473 CS |
867 | int catlen; |
868 | ssize_t rc = -EINVAL; | |
869 | char *data = NULL; | |
870 | char *rule; | |
871 | int ret; | |
872 | int i; | |
873 | ||
874 | /* | |
875 | * Must have privilege. | |
876 | * No partial writes. | |
877 | * Enough data must be present. | |
878 | */ | |
1880eff7 | 879 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
880 | return -EPERM; |
881 | if (*ppos != 0) | |
882 | return -EINVAL; | |
f7112e6c CS |
883 | if (format == SMK_FIXED24_FMT && |
884 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
885 | return -EINVAL; |
886 | ||
16e5c1fc AV |
887 | data = memdup_user_nul(buf, count); |
888 | if (IS_ERR(data)) | |
889 | return PTR_ERR(data); | |
e114e473 | 890 | |
e114e473 CS |
891 | rule = data; |
892 | /* | |
893 | * Only allow one writer at a time. Writes should be | |
894 | * quite rare and small in any case. | |
895 | */ | |
896 | mutex_lock(&smack_cipso_lock); | |
897 | ||
898 | skp = smk_import_entry(rule, 0); | |
e774ad68 LP |
899 | if (IS_ERR(skp)) { |
900 | rc = PTR_ERR(skp); | |
e114e473 | 901 | goto out; |
e774ad68 | 902 | } |
e114e473 | 903 | |
f7112e6c CS |
904 | if (format == SMK_FIXED24_FMT) |
905 | rule += SMK_LABELLEN; | |
906 | else | |
0fcfee61 | 907 | rule += strlen(skp->smk_known) + 1; |
f7112e6c | 908 | |
e114e473 CS |
909 | ret = sscanf(rule, "%d", &maplevel); |
910 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
911 | goto out; | |
912 | ||
913 | rule += SMK_DIGITLEN; | |
914 | ret = sscanf(rule, "%d", &catlen); | |
915 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
916 | goto out; | |
917 | ||
f7112e6c CS |
918 | if (format == SMK_FIXED24_FMT && |
919 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
920 | goto out; |
921 | ||
922 | memset(mapcatset, 0, sizeof(mapcatset)); | |
923 | ||
924 | for (i = 0; i < catlen; i++) { | |
925 | rule += SMK_DIGITLEN; | |
f7112e6c | 926 | ret = sscanf(rule, "%u", &cat); |
677264e8 | 927 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
928 | goto out; |
929 | ||
930 | smack_catset_bit(cat, mapcatset); | |
931 | } | |
932 | ||
f7112e6c CS |
933 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
934 | if (rc >= 0) { | |
4fbe63d1 | 935 | netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat); |
f7112e6c CS |
936 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
937 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
938 | rc = count; | |
e114e473 CS |
939 | } |
940 | ||
e114e473 CS |
941 | out: |
942 | mutex_unlock(&smack_cipso_lock); | |
e114e473 CS |
943 | kfree(data); |
944 | return rc; | |
945 | } | |
946 | ||
f7112e6c CS |
947 | /** |
948 | * smk_write_cipso - write() for /smack/cipso | |
949 | * @file: file pointer, not actually used | |
950 | * @buf: where to get the data from | |
951 | * @count: bytes sent | |
952 | * @ppos: where to start | |
953 | * | |
954 | * Accepts only one cipso rule per write call. | |
955 | * Returns number of bytes written or error code, as appropriate | |
956 | */ | |
957 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
958 | size_t count, loff_t *ppos) | |
959 | { | |
960 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
961 | } | |
962 | ||
e114e473 CS |
963 | static const struct file_operations smk_cipso_ops = { |
964 | .open = smk_open_cipso, | |
965 | .read = seq_read, | |
966 | .llseek = seq_lseek, | |
967 | .write = smk_write_cipso, | |
968 | .release = seq_release, | |
969 | }; | |
970 | ||
f7112e6c CS |
971 | /* |
972 | * Seq_file read operations for /smack/cipso2 | |
973 | */ | |
974 | ||
975 | /* | |
976 | * Print cipso labels in format: | |
977 | * label level[/cat[,cat]] | |
978 | */ | |
979 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
980 | { | |
981 | struct list_head *list = v; | |
982 | struct smack_known *skp = | |
01fa8474 | 983 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 984 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
f7112e6c CS |
985 | char sep = '/'; |
986 | int i; | |
987 | ||
988 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
989 | ||
4fbe63d1 PM |
990 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
991 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
992 | seq_printf(s, "%c%d", sep, i); |
993 | sep = ','; | |
994 | } | |
995 | ||
996 | seq_putc(s, '\n'); | |
997 | ||
998 | return 0; | |
999 | } | |
1000 | ||
1001 | static const struct seq_operations cipso2_seq_ops = { | |
1002 | .start = cipso_seq_start, | |
1003 | .next = cipso_seq_next, | |
1004 | .show = cipso2_seq_show, | |
1005 | .stop = smk_seq_stop, | |
1006 | }; | |
1007 | ||
1008 | /** | |
1009 | * smk_open_cipso2 - open() for /smack/cipso2 | |
1010 | * @inode: inode structure representing file | |
1011 | * @file: "cipso2" file pointer | |
1012 | * | |
1013 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
1014 | * file_operations | |
1015 | */ | |
1016 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
1017 | { | |
1018 | return seq_open(file, &cipso2_seq_ops); | |
1019 | } | |
1020 | ||
1021 | /** | |
1022 | * smk_write_cipso2 - write() for /smack/cipso2 | |
1023 | * @file: file pointer, not actually used | |
1024 | * @buf: where to get the data from | |
1025 | * @count: bytes sent | |
1026 | * @ppos: where to start | |
1027 | * | |
1028 | * Accepts only one cipso rule per write call. | |
1029 | * Returns number of bytes written or error code, as appropriate | |
1030 | */ | |
1031 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1032 | size_t count, loff_t *ppos) | |
1033 | { | |
1034 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1035 | } | |
1036 | ||
1037 | static const struct file_operations smk_cipso2_ops = { | |
1038 | .open = smk_open_cipso2, | |
1039 | .read = seq_read, | |
1040 | .llseek = seq_lseek, | |
1041 | .write = smk_write_cipso2, | |
1042 | .release = seq_release, | |
1043 | }; | |
1044 | ||
6d3dc07c CS |
1045 | /* |
1046 | * Seq_file read operations for /smack/netlabel | |
1047 | */ | |
1048 | ||
21abb1ec | 1049 | static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
6d3dc07c | 1050 | { |
21abb1ec | 1051 | return smk_seq_start(s, pos, &smk_net4addr_list); |
6d3dc07c CS |
1052 | } |
1053 | ||
21abb1ec | 1054 | static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
6d3dc07c | 1055 | { |
21abb1ec | 1056 | return smk_seq_next(s, v, pos, &smk_net4addr_list); |
6d3dc07c | 1057 | } |
6d3dc07c CS |
1058 | |
1059 | /* | |
1060 | * Print host/label pairs | |
1061 | */ | |
21abb1ec | 1062 | static int net4addr_seq_show(struct seq_file *s, void *v) |
6d3dc07c | 1063 | { |
7198e2ee | 1064 | struct list_head *list = v; |
21abb1ec CS |
1065 | struct smk_net4addr *skp = |
1066 | list_entry_rcu(list, struct smk_net4addr, list); | |
1067 | char *kp = SMACK_CIPSO_OPTION; | |
6d3dc07c | 1068 | |
21abb1ec CS |
1069 | if (skp->smk_label != NULL) |
1070 | kp = skp->smk_label->smk_known; | |
1071 | seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr, | |
1072 | skp->smk_masks, kp); | |
6d3dc07c CS |
1073 | |
1074 | return 0; | |
1075 | } | |
1076 | ||
21abb1ec CS |
1077 | static const struct seq_operations net4addr_seq_ops = { |
1078 | .start = net4addr_seq_start, | |
1079 | .next = net4addr_seq_next, | |
1080 | .show = net4addr_seq_show, | |
40809565 | 1081 | .stop = smk_seq_stop, |
6d3dc07c CS |
1082 | }; |
1083 | ||
1084 | /** | |
21abb1ec | 1085 | * smk_open_net4addr - open() for /smack/netlabel |
6d3dc07c CS |
1086 | * @inode: inode structure representing file |
1087 | * @file: "netlabel" file pointer | |
1088 | * | |
21abb1ec | 1089 | * Connect our net4addr_seq_* operations with /smack/netlabel |
6d3dc07c CS |
1090 | * file_operations |
1091 | */ | |
21abb1ec | 1092 | static int smk_open_net4addr(struct inode *inode, struct file *file) |
6d3dc07c | 1093 | { |
21abb1ec | 1094 | return seq_open(file, &net4addr_seq_ops); |
6d3dc07c CS |
1095 | } |
1096 | ||
113a0e45 | 1097 | /** |
21abb1ec | 1098 | * smk_net4addr_insert |
113a0e45 | 1099 | * @new : netlabel to insert |
1100 | * | |
21abb1ec | 1101 | * This helper insert netlabel in the smack_net4addrs list |
113a0e45 | 1102 | * sorted by netmask length (longest to smallest) |
21abb1ec | 1103 | * locked by &smk_net4addr_lock in smk_write_net4addr |
7198e2ee | 1104 | * |
113a0e45 | 1105 | */ |
21abb1ec | 1106 | static void smk_net4addr_insert(struct smk_net4addr *new) |
113a0e45 | 1107 | { |
21abb1ec CS |
1108 | struct smk_net4addr *m; |
1109 | struct smk_net4addr *m_next; | |
113a0e45 | 1110 | |
21abb1ec CS |
1111 | if (list_empty(&smk_net4addr_list)) { |
1112 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1113 | return; |
1114 | } | |
1115 | ||
21abb1ec CS |
1116 | m = list_entry_rcu(smk_net4addr_list.next, |
1117 | struct smk_net4addr, list); | |
7198e2ee | 1118 | |
113a0e45 | 1119 | /* the comparison '>' is a bit hacky, but works */ |
21abb1ec CS |
1120 | if (new->smk_masks > m->smk_masks) { |
1121 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1122 | return; |
1123 | } | |
7198e2ee | 1124 | |
21abb1ec CS |
1125 | list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
1126 | if (list_is_last(&m->list, &smk_net4addr_list)) { | |
7198e2ee | 1127 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1128 | return; |
1129 | } | |
05725f7e | 1130 | m_next = list_entry_rcu(m->list.next, |
21abb1ec CS |
1131 | struct smk_net4addr, list); |
1132 | if (new->smk_masks > m_next->smk_masks) { | |
7198e2ee | 1133 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1134 | return; |
1135 | } | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | ||
6d3dc07c | 1140 | /** |
21abb1ec | 1141 | * smk_write_net4addr - write() for /smack/netlabel |
251a2a95 | 1142 | * @file: file pointer, not actually used |
6d3dc07c CS |
1143 | * @buf: where to get the data from |
1144 | * @count: bytes sent | |
1145 | * @ppos: where to start | |
1146 | * | |
21abb1ec | 1147 | * Accepts only one net4addr per write call. |
6d3dc07c CS |
1148 | * Returns number of bytes written or error code, as appropriate |
1149 | */ | |
21abb1ec | 1150 | static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
6d3dc07c CS |
1151 | size_t count, loff_t *ppos) |
1152 | { | |
21abb1ec | 1153 | struct smk_net4addr *snp; |
6d3dc07c | 1154 | struct sockaddr_in newname; |
f7112e6c | 1155 | char *smack; |
21abb1ec | 1156 | struct smack_known *skp = NULL; |
f7112e6c | 1157 | char *data; |
6d3dc07c CS |
1158 | char *host = (char *)&newname.sin_addr.s_addr; |
1159 | int rc; | |
1160 | struct netlbl_audit audit_info; | |
1161 | struct in_addr mask; | |
1162 | unsigned int m; | |
21abb1ec | 1163 | unsigned int masks; |
7198e2ee | 1164 | int found; |
113a0e45 | 1165 | u32 mask_bits = (1<<31); |
6d3dc07c | 1166 | __be32 nsa; |
113a0e45 | 1167 | u32 temp_mask; |
6d3dc07c CS |
1168 | |
1169 | /* | |
1170 | * Must have privilege. | |
1171 | * No partial writes. | |
1172 | * Enough data must be present. | |
1173 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1174 | * "<addr, as a.b.c.d><space><label>" | |
1175 | */ | |
1880eff7 | 1176 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1177 | return -EPERM; |
1178 | if (*ppos != 0) | |
1179 | return -EINVAL; | |
f7112e6c | 1180 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1181 | return -EINVAL; |
f7112e6c | 1182 | |
16e5c1fc AV |
1183 | data = memdup_user_nul(buf, count); |
1184 | if (IS_ERR(data)) | |
1185 | return PTR_ERR(data); | |
f7112e6c CS |
1186 | |
1187 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1188 | if (smack == NULL) { | |
1189 | rc = -ENOMEM; | |
1190 | goto free_data_out; | |
1191 | } | |
6d3dc07c | 1192 | |
ec554fa7 | 1193 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
21abb1ec | 1194 | &host[0], &host[1], &host[2], &host[3], &masks, smack); |
6d3dc07c CS |
1195 | if (rc != 6) { |
1196 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1197 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1198 | if (rc != 5) { |
1199 | rc = -EINVAL; | |
1200 | goto free_out; | |
1201 | } | |
6d3dc07c | 1202 | m = BEBITS; |
21abb1ec | 1203 | masks = 32; |
6d3dc07c | 1204 | } |
21abb1ec | 1205 | if (masks > BEBITS) { |
f7112e6c CS |
1206 | rc = -EINVAL; |
1207 | goto free_out; | |
1208 | } | |
6d3dc07c | 1209 | |
f7112e6c CS |
1210 | /* |
1211 | * If smack begins with '-', it is an option, don't import it | |
1212 | */ | |
4303154e | 1213 | if (smack[0] != '-') { |
21c7eae2 | 1214 | skp = smk_import_entry(smack, 0); |
e774ad68 LP |
1215 | if (IS_ERR(skp)) { |
1216 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1217 | goto free_out; |
1218 | } | |
4303154e | 1219 | } else { |
21abb1ec CS |
1220 | /* |
1221 | * Only the -CIPSO option is supported for IPv4 | |
1222 | */ | |
1223 | if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { | |
f7112e6c CS |
1224 | rc = -EINVAL; |
1225 | goto free_out; | |
1226 | } | |
4303154e | 1227 | } |
6d3dc07c | 1228 | |
21abb1ec | 1229 | for (m = masks, temp_mask = 0; m > 0; m--) { |
113a0e45 | 1230 | temp_mask |= mask_bits; |
1231 | mask_bits >>= 1; | |
6d3dc07c | 1232 | } |
113a0e45 | 1233 | mask.s_addr = cpu_to_be32(temp_mask); |
1234 | ||
1235 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1236 | /* |
1237 | * Only allow one writer at a time. Writes should be | |
1238 | * quite rare and small in any case. | |
1239 | */ | |
21abb1ec | 1240 | mutex_lock(&smk_net4addr_lock); |
6d3dc07c CS |
1241 | |
1242 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1243 | /* try to find if the prefix is already in the list */ |
7198e2ee | 1244 | found = 0; |
21abb1ec CS |
1245 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
1246 | if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { | |
7198e2ee | 1247 | found = 1; |
6d3dc07c | 1248 | break; |
7198e2ee EB |
1249 | } |
1250 | } | |
6d3dc07c CS |
1251 | smk_netlabel_audit_set(&audit_info); |
1252 | ||
7198e2ee | 1253 | if (found == 0) { |
21c7eae2 LP |
1254 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
1255 | if (snp == NULL) | |
6d3dc07c CS |
1256 | rc = -ENOMEM; |
1257 | else { | |
1258 | rc = 0; | |
21abb1ec | 1259 | snp->smk_host.s_addr = newname.sin_addr.s_addr; |
21c7eae2 LP |
1260 | snp->smk_mask.s_addr = mask.s_addr; |
1261 | snp->smk_label = skp; | |
21abb1ec CS |
1262 | snp->smk_masks = masks; |
1263 | smk_net4addr_insert(snp); | |
6d3dc07c CS |
1264 | } |
1265 | } else { | |
21abb1ec CS |
1266 | /* |
1267 | * Delete the unlabeled entry, only if the previous label | |
1268 | * wasn't the special CIPSO option | |
1269 | */ | |
1270 | if (snp->smk_label != NULL) | |
4303154e | 1271 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
21abb1ec | 1272 | &snp->smk_host, &snp->smk_mask, |
4303154e EB |
1273 | PF_INET, &audit_info); |
1274 | else | |
1275 | rc = 0; | |
21c7eae2 | 1276 | snp->smk_label = skp; |
6d3dc07c CS |
1277 | } |
1278 | ||
1279 | /* | |
1280 | * Now tell netlabel about the single label nature of | |
1281 | * this host so that incoming packets get labeled. | |
4303154e | 1282 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1283 | */ |
21abb1ec | 1284 | if (rc == 0 && skp != NULL) |
6d3dc07c | 1285 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
21abb1ec | 1286 | &snp->smk_host, &snp->smk_mask, PF_INET, |
21c7eae2 | 1287 | snp->smk_label->smk_secid, &audit_info); |
6d3dc07c CS |
1288 | |
1289 | if (rc == 0) | |
1290 | rc = count; | |
1291 | ||
21abb1ec CS |
1292 | mutex_unlock(&smk_net4addr_lock); |
1293 | ||
1294 | free_out: | |
1295 | kfree(smack); | |
1296 | free_data_out: | |
1297 | kfree(data); | |
1298 | ||
1299 | return rc; | |
1300 | } | |
1301 | ||
1302 | static const struct file_operations smk_net4addr_ops = { | |
1303 | .open = smk_open_net4addr, | |
1304 | .read = seq_read, | |
1305 | .llseek = seq_lseek, | |
1306 | .write = smk_write_net4addr, | |
1307 | .release = seq_release, | |
1308 | }; | |
1309 | ||
1310 | #if IS_ENABLED(CONFIG_IPV6) | |
1311 | /* | |
1312 | * Seq_file read operations for /smack/netlabel6 | |
1313 | */ | |
1314 | ||
1315 | static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) | |
1316 | { | |
1317 | return smk_seq_start(s, pos, &smk_net6addr_list); | |
1318 | } | |
1319 | ||
1320 | static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1321 | { | |
1322 | return smk_seq_next(s, v, pos, &smk_net6addr_list); | |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * Print host/label pairs | |
1327 | */ | |
1328 | static int net6addr_seq_show(struct seq_file *s, void *v) | |
1329 | { | |
1330 | struct list_head *list = v; | |
1331 | struct smk_net6addr *skp = | |
1332 | list_entry(list, struct smk_net6addr, list); | |
1333 | ||
1334 | if (skp->smk_label != NULL) | |
1335 | seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks, | |
1336 | skp->smk_label->smk_known); | |
1337 | ||
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | static const struct seq_operations net6addr_seq_ops = { | |
1342 | .start = net6addr_seq_start, | |
1343 | .next = net6addr_seq_next, | |
1344 | .show = net6addr_seq_show, | |
1345 | .stop = smk_seq_stop, | |
1346 | }; | |
1347 | ||
1348 | /** | |
1349 | * smk_open_net6addr - open() for /smack/netlabel | |
1350 | * @inode: inode structure representing file | |
1351 | * @file: "netlabel" file pointer | |
1352 | * | |
1353 | * Connect our net6addr_seq_* operations with /smack/netlabel | |
1354 | * file_operations | |
1355 | */ | |
1356 | static int smk_open_net6addr(struct inode *inode, struct file *file) | |
1357 | { | |
1358 | return seq_open(file, &net6addr_seq_ops); | |
1359 | } | |
1360 | ||
1361 | /** | |
1362 | * smk_net6addr_insert | |
1363 | * @new : entry to insert | |
1364 | * | |
1365 | * This inserts an entry in the smack_net6addrs list | |
1366 | * sorted by netmask length (longest to smallest) | |
1367 | * locked by &smk_net6addr_lock in smk_write_net6addr | |
1368 | * | |
1369 | */ | |
1370 | static void smk_net6addr_insert(struct smk_net6addr *new) | |
1371 | { | |
1372 | struct smk_net6addr *m_next; | |
1373 | struct smk_net6addr *m; | |
1374 | ||
1375 | if (list_empty(&smk_net6addr_list)) { | |
1376 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1377 | return; | |
1378 | } | |
1379 | ||
1380 | m = list_entry_rcu(smk_net6addr_list.next, | |
1381 | struct smk_net6addr, list); | |
1382 | ||
1383 | if (new->smk_masks > m->smk_masks) { | |
1384 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1385 | return; | |
1386 | } | |
1387 | ||
1388 | list_for_each_entry_rcu(m, &smk_net6addr_list, list) { | |
1389 | if (list_is_last(&m->list, &smk_net6addr_list)) { | |
1390 | list_add_rcu(&new->list, &m->list); | |
1391 | return; | |
1392 | } | |
1393 | m_next = list_entry_rcu(m->list.next, | |
1394 | struct smk_net6addr, list); | |
1395 | if (new->smk_masks > m_next->smk_masks) { | |
1396 | list_add_rcu(&new->list, &m->list); | |
1397 | return; | |
1398 | } | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | ||
1403 | /** | |
1404 | * smk_write_net6addr - write() for /smack/netlabel | |
1405 | * @file: file pointer, not actually used | |
1406 | * @buf: where to get the data from | |
1407 | * @count: bytes sent | |
1408 | * @ppos: where to start | |
1409 | * | |
1410 | * Accepts only one net6addr per write call. | |
1411 | * Returns number of bytes written or error code, as appropriate | |
1412 | */ | |
1413 | static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, | |
1414 | size_t count, loff_t *ppos) | |
1415 | { | |
1416 | struct smk_net6addr *snp; | |
1417 | struct in6_addr newname; | |
1418 | struct in6_addr fullmask; | |
1419 | struct smack_known *skp = NULL; | |
1420 | char *smack; | |
1421 | char *data; | |
1422 | int rc = 0; | |
1423 | int found = 0; | |
1424 | int i; | |
1425 | unsigned int scanned[8]; | |
1426 | unsigned int m; | |
1427 | unsigned int mask = 128; | |
1428 | ||
1429 | /* | |
1430 | * Must have privilege. | |
1431 | * No partial writes. | |
1432 | * Enough data must be present. | |
1433 | * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" | |
1434 | * "<addr, as a:b:c:d:e:f:g:h><space><label>" | |
1435 | */ | |
1436 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
1437 | return -EPERM; | |
1438 | if (*ppos != 0) | |
1439 | return -EINVAL; | |
1440 | if (count < SMK_NETLBLADDRMIN) | |
1441 | return -EINVAL; | |
1442 | ||
16e5c1fc AV |
1443 | data = memdup_user_nul(buf, count); |
1444 | if (IS_ERR(data)) | |
1445 | return PTR_ERR(data); | |
21abb1ec CS |
1446 | |
1447 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1448 | if (smack == NULL) { | |
1449 | rc = -ENOMEM; | |
1450 | goto free_data_out; | |
1451 | } | |
1452 | ||
21abb1ec CS |
1453 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s", |
1454 | &scanned[0], &scanned[1], &scanned[2], &scanned[3], | |
1455 | &scanned[4], &scanned[5], &scanned[6], &scanned[7], | |
1456 | &mask, smack); | |
1457 | if (i != 10) { | |
1458 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s", | |
1459 | &scanned[0], &scanned[1], &scanned[2], | |
1460 | &scanned[3], &scanned[4], &scanned[5], | |
1461 | &scanned[6], &scanned[7], smack); | |
1462 | if (i != 9) { | |
1463 | rc = -EINVAL; | |
1464 | goto free_out; | |
1465 | } | |
1466 | } | |
1467 | if (mask > 128) { | |
1468 | rc = -EINVAL; | |
1469 | goto free_out; | |
1470 | } | |
1471 | for (i = 0; i < 8; i++) { | |
1472 | if (scanned[i] > 0xffff) { | |
1473 | rc = -EINVAL; | |
1474 | goto free_out; | |
1475 | } | |
1476 | newname.s6_addr16[i] = htons(scanned[i]); | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * If smack begins with '-', it is an option, don't import it | |
1481 | */ | |
1482 | if (smack[0] != '-') { | |
1483 | skp = smk_import_entry(smack, 0); | |
5f2bfe2f LP |
1484 | if (IS_ERR(skp)) { |
1485 | rc = PTR_ERR(skp); | |
21abb1ec CS |
1486 | goto free_out; |
1487 | } | |
1488 | } else { | |
1489 | /* | |
1490 | * Only -DELETE is supported for IPv6 | |
1491 | */ | |
1492 | if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { | |
1493 | rc = -EINVAL; | |
1494 | goto free_out; | |
1495 | } | |
1496 | } | |
1497 | ||
1498 | for (i = 0, m = mask; i < 8; i++) { | |
1499 | if (m >= 16) { | |
1500 | fullmask.s6_addr16[i] = 0xffff; | |
1501 | m -= 16; | |
1502 | } else if (m > 0) { | |
1503 | fullmask.s6_addr16[i] = (1 << m) - 1; | |
1504 | m = 0; | |
1505 | } else | |
1506 | fullmask.s6_addr16[i] = 0; | |
1507 | newname.s6_addr16[i] &= fullmask.s6_addr16[i]; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * Only allow one writer at a time. Writes should be | |
1512 | * quite rare and small in any case. | |
1513 | */ | |
1514 | mutex_lock(&smk_net6addr_lock); | |
1515 | /* | |
1516 | * Try to find the prefix in the list | |
1517 | */ | |
1518 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
1519 | if (mask != snp->smk_masks) | |
1520 | continue; | |
1521 | for (found = 1, i = 0; i < 8; i++) { | |
1522 | if (newname.s6_addr16[i] != | |
1523 | snp->smk_host.s6_addr16[i]) { | |
1524 | found = 0; | |
1525 | break; | |
1526 | } | |
1527 | } | |
1528 | if (found == 1) | |
1529 | break; | |
1530 | } | |
1531 | if (found == 0) { | |
1532 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); | |
1533 | if (snp == NULL) | |
1534 | rc = -ENOMEM; | |
1535 | else { | |
1536 | snp->smk_host = newname; | |
1537 | snp->smk_mask = fullmask; | |
1538 | snp->smk_masks = mask; | |
1539 | snp->smk_label = skp; | |
1540 | smk_net6addr_insert(snp); | |
1541 | } | |
1542 | } else { | |
1543 | snp->smk_label = skp; | |
1544 | } | |
1545 | ||
1546 | if (rc == 0) | |
1547 | rc = count; | |
1548 | ||
1549 | mutex_unlock(&smk_net6addr_lock); | |
6d3dc07c | 1550 | |
f7112e6c CS |
1551 | free_out: |
1552 | kfree(smack); | |
1553 | free_data_out: | |
1554 | kfree(data); | |
1555 | ||
6d3dc07c CS |
1556 | return rc; |
1557 | } | |
1558 | ||
21abb1ec CS |
1559 | static const struct file_operations smk_net6addr_ops = { |
1560 | .open = smk_open_net6addr, | |
6d3dc07c CS |
1561 | .read = seq_read, |
1562 | .llseek = seq_lseek, | |
21abb1ec | 1563 | .write = smk_write_net6addr, |
6d3dc07c CS |
1564 | .release = seq_release, |
1565 | }; | |
21abb1ec | 1566 | #endif /* CONFIG_IPV6 */ |
6d3dc07c | 1567 | |
e114e473 CS |
1568 | /** |
1569 | * smk_read_doi - read() for /smack/doi | |
1570 | * @filp: file pointer, not actually used | |
1571 | * @buf: where to put the result | |
1572 | * @count: maximum to send along | |
1573 | * @ppos: where to start | |
1574 | * | |
1575 | * Returns number of bytes read or error code, as appropriate | |
1576 | */ | |
1577 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1578 | size_t count, loff_t *ppos) | |
1579 | { | |
1580 | char temp[80]; | |
1581 | ssize_t rc; | |
1582 | ||
1583 | if (*ppos != 0) | |
1584 | return 0; | |
1585 | ||
1586 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1587 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1588 | ||
1589 | return rc; | |
1590 | } | |
1591 | ||
1592 | /** | |
1593 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1594 | * @file: file pointer, not actually used |
e114e473 CS |
1595 | * @buf: where to get the data from |
1596 | * @count: bytes sent | |
1597 | * @ppos: where to start | |
1598 | * | |
1599 | * Returns number of bytes written or error code, as appropriate | |
1600 | */ | |
1601 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1602 | size_t count, loff_t *ppos) | |
1603 | { | |
1604 | char temp[80]; | |
1605 | int i; | |
1606 | ||
1880eff7 | 1607 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1608 | return -EPERM; |
1609 | ||
1610 | if (count >= sizeof(temp) || count == 0) | |
1611 | return -EINVAL; | |
1612 | ||
1613 | if (copy_from_user(temp, buf, count) != 0) | |
1614 | return -EFAULT; | |
1615 | ||
1616 | temp[count] = '\0'; | |
1617 | ||
1618 | if (sscanf(temp, "%d", &i) != 1) | |
1619 | return -EINVAL; | |
1620 | ||
1621 | smk_cipso_doi_value = i; | |
1622 | ||
1623 | smk_cipso_doi(); | |
1624 | ||
1625 | return count; | |
1626 | } | |
1627 | ||
1628 | static const struct file_operations smk_doi_ops = { | |
1629 | .read = smk_read_doi, | |
1630 | .write = smk_write_doi, | |
6038f373 | 1631 | .llseek = default_llseek, |
e114e473 CS |
1632 | }; |
1633 | ||
1634 | /** | |
1635 | * smk_read_direct - read() for /smack/direct | |
1636 | * @filp: file pointer, not actually used | |
1637 | * @buf: where to put the result | |
1638 | * @count: maximum to send along | |
1639 | * @ppos: where to start | |
1640 | * | |
1641 | * Returns number of bytes read or error code, as appropriate | |
1642 | */ | |
1643 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1644 | size_t count, loff_t *ppos) | |
1645 | { | |
1646 | char temp[80]; | |
1647 | ssize_t rc; | |
1648 | ||
1649 | if (*ppos != 0) | |
1650 | return 0; | |
1651 | ||
1652 | sprintf(temp, "%d", smack_cipso_direct); | |
1653 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1654 | ||
1655 | return rc; | |
1656 | } | |
1657 | ||
1658 | /** | |
1659 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1660 | * @file: file pointer, not actually used |
e114e473 CS |
1661 | * @buf: where to get the data from |
1662 | * @count: bytes sent | |
1663 | * @ppos: where to start | |
1664 | * | |
1665 | * Returns number of bytes written or error code, as appropriate | |
1666 | */ | |
1667 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1668 | size_t count, loff_t *ppos) | |
1669 | { | |
f7112e6c | 1670 | struct smack_known *skp; |
e114e473 CS |
1671 | char temp[80]; |
1672 | int i; | |
1673 | ||
1880eff7 | 1674 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1675 | return -EPERM; |
1676 | ||
1677 | if (count >= sizeof(temp) || count == 0) | |
1678 | return -EINVAL; | |
1679 | ||
1680 | if (copy_from_user(temp, buf, count) != 0) | |
1681 | return -EFAULT; | |
1682 | ||
1683 | temp[count] = '\0'; | |
1684 | ||
1685 | if (sscanf(temp, "%d", &i) != 1) | |
1686 | return -EINVAL; | |
1687 | ||
f7112e6c CS |
1688 | /* |
1689 | * Don't do anything if the value hasn't actually changed. | |
1690 | * If it is changing reset the level on entries that were | |
1691 | * set up to be direct when they were created. | |
1692 | */ | |
1693 | if (smack_cipso_direct != i) { | |
1694 | mutex_lock(&smack_known_lock); | |
1695 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1696 | if (skp->smk_netlabel.attr.mls.lvl == | |
1697 | smack_cipso_direct) | |
1698 | skp->smk_netlabel.attr.mls.lvl = i; | |
1699 | smack_cipso_direct = i; | |
1700 | mutex_unlock(&smack_known_lock); | |
1701 | } | |
e114e473 CS |
1702 | |
1703 | return count; | |
1704 | } | |
1705 | ||
1706 | static const struct file_operations smk_direct_ops = { | |
1707 | .read = smk_read_direct, | |
1708 | .write = smk_write_direct, | |
6038f373 | 1709 | .llseek = default_llseek, |
e114e473 CS |
1710 | }; |
1711 | ||
f7112e6c CS |
1712 | /** |
1713 | * smk_read_mapped - read() for /smack/mapped | |
1714 | * @filp: file pointer, not actually used | |
1715 | * @buf: where to put the result | |
1716 | * @count: maximum to send along | |
1717 | * @ppos: where to start | |
1718 | * | |
1719 | * Returns number of bytes read or error code, as appropriate | |
1720 | */ | |
1721 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1722 | size_t count, loff_t *ppos) | |
1723 | { | |
1724 | char temp[80]; | |
1725 | ssize_t rc; | |
1726 | ||
1727 | if (*ppos != 0) | |
1728 | return 0; | |
1729 | ||
1730 | sprintf(temp, "%d", smack_cipso_mapped); | |
1731 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1732 | ||
1733 | return rc; | |
1734 | } | |
1735 | ||
1736 | /** | |
1737 | * smk_write_mapped - write() for /smack/mapped | |
1738 | * @file: file pointer, not actually used | |
1739 | * @buf: where to get the data from | |
1740 | * @count: bytes sent | |
1741 | * @ppos: where to start | |
1742 | * | |
1743 | * Returns number of bytes written or error code, as appropriate | |
1744 | */ | |
1745 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1746 | size_t count, loff_t *ppos) | |
1747 | { | |
1748 | struct smack_known *skp; | |
1749 | char temp[80]; | |
1750 | int i; | |
1751 | ||
1880eff7 | 1752 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1753 | return -EPERM; |
1754 | ||
1755 | if (count >= sizeof(temp) || count == 0) | |
1756 | return -EINVAL; | |
1757 | ||
1758 | if (copy_from_user(temp, buf, count) != 0) | |
1759 | return -EFAULT; | |
1760 | ||
1761 | temp[count] = '\0'; | |
1762 | ||
1763 | if (sscanf(temp, "%d", &i) != 1) | |
1764 | return -EINVAL; | |
1765 | ||
1766 | /* | |
1767 | * Don't do anything if the value hasn't actually changed. | |
1768 | * If it is changing reset the level on entries that were | |
1769 | * set up to be mapped when they were created. | |
1770 | */ | |
1771 | if (smack_cipso_mapped != i) { | |
1772 | mutex_lock(&smack_known_lock); | |
1773 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1774 | if (skp->smk_netlabel.attr.mls.lvl == | |
1775 | smack_cipso_mapped) | |
1776 | skp->smk_netlabel.attr.mls.lvl = i; | |
1777 | smack_cipso_mapped = i; | |
1778 | mutex_unlock(&smack_known_lock); | |
1779 | } | |
1780 | ||
1781 | return count; | |
1782 | } | |
1783 | ||
1784 | static const struct file_operations smk_mapped_ops = { | |
1785 | .read = smk_read_mapped, | |
1786 | .write = smk_write_mapped, | |
1787 | .llseek = default_llseek, | |
1788 | }; | |
1789 | ||
e114e473 CS |
1790 | /** |
1791 | * smk_read_ambient - read() for /smack/ambient | |
1792 | * @filp: file pointer, not actually used | |
1793 | * @buf: where to put the result | |
1794 | * @cn: maximum to send along | |
1795 | * @ppos: where to start | |
1796 | * | |
1797 | * Returns number of bytes read or error code, as appropriate | |
1798 | */ | |
1799 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1800 | size_t cn, loff_t *ppos) | |
1801 | { | |
1802 | ssize_t rc; | |
e114e473 CS |
1803 | int asize; |
1804 | ||
1805 | if (*ppos != 0) | |
1806 | return 0; | |
1807 | /* | |
1808 | * Being careful to avoid a problem in the case where | |
1809 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1810 | */ |
4bc87e62 | 1811 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1812 | |
2f823ff8 | 1813 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1814 | |
1815 | if (cn >= asize) | |
1816 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1817 | smack_net_ambient->smk_known, |
1818 | asize); | |
4bc87e62 CS |
1819 | else |
1820 | rc = -EINVAL; | |
e114e473 | 1821 | |
4bc87e62 | 1822 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1823 | |
1824 | return rc; | |
1825 | } | |
1826 | ||
1827 | /** | |
1828 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1829 | * @file: file pointer, not actually used |
e114e473 CS |
1830 | * @buf: where to get the data from |
1831 | * @count: bytes sent | |
1832 | * @ppos: where to start | |
1833 | * | |
1834 | * Returns number of bytes written or error code, as appropriate | |
1835 | */ | |
1836 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1837 | size_t count, loff_t *ppos) | |
1838 | { | |
2f823ff8 | 1839 | struct smack_known *skp; |
4bc87e62 | 1840 | char *oldambient; |
f7112e6c CS |
1841 | char *data; |
1842 | int rc = count; | |
e114e473 | 1843 | |
1880eff7 | 1844 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1845 | return -EPERM; |
1846 | ||
16e5c1fc AV |
1847 | data = memdup_user_nul(buf, count); |
1848 | if (IS_ERR(data)) | |
1849 | return PTR_ERR(data); | |
e114e473 | 1850 | |
2f823ff8 | 1851 | skp = smk_import_entry(data, count); |
e774ad68 LP |
1852 | if (IS_ERR(skp)) { |
1853 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1854 | goto out; |
1855 | } | |
e114e473 | 1856 | |
4bc87e62 CS |
1857 | mutex_lock(&smack_ambient_lock); |
1858 | ||
2f823ff8 CS |
1859 | oldambient = smack_net_ambient->smk_known; |
1860 | smack_net_ambient = skp; | |
4bc87e62 CS |
1861 | smk_unlbl_ambient(oldambient); |
1862 | ||
1863 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1864 | |
f7112e6c CS |
1865 | out: |
1866 | kfree(data); | |
1867 | return rc; | |
e114e473 CS |
1868 | } |
1869 | ||
1870 | static const struct file_operations smk_ambient_ops = { | |
1871 | .read = smk_read_ambient, | |
1872 | .write = smk_write_ambient, | |
6038f373 | 1873 | .llseek = default_llseek, |
e114e473 CS |
1874 | }; |
1875 | ||
c0d77c88 RK |
1876 | /* |
1877 | * Seq_file operations for /smack/onlycap | |
15446235 | 1878 | */ |
c0d77c88 | 1879 | static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
15446235 | 1880 | { |
c0d77c88 RK |
1881 | return smk_seq_start(s, pos, &smack_onlycap_list); |
1882 | } | |
15446235 | 1883 | |
c0d77c88 RK |
1884 | static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1885 | { | |
1886 | return smk_seq_next(s, v, pos, &smack_onlycap_list); | |
1887 | } | |
15446235 | 1888 | |
c0d77c88 RK |
1889 | static int onlycap_seq_show(struct seq_file *s, void *v) |
1890 | { | |
1891 | struct list_head *list = v; | |
38416e53 ZJ |
1892 | struct smack_known_list_elem *sklep = |
1893 | list_entry_rcu(list, struct smack_known_list_elem, list); | |
15446235 | 1894 | |
38416e53 | 1895 | seq_puts(s, sklep->smk_label->smk_known); |
c0d77c88 | 1896 | seq_putc(s, ' '); |
15446235 | 1897 | |
c0d77c88 RK |
1898 | return 0; |
1899 | } | |
15446235 | 1900 | |
c0d77c88 RK |
1901 | static const struct seq_operations onlycap_seq_ops = { |
1902 | .start = onlycap_seq_start, | |
1903 | .next = onlycap_seq_next, | |
1904 | .show = onlycap_seq_show, | |
1905 | .stop = smk_seq_stop, | |
1906 | }; | |
1907 | ||
1908 | static int smk_open_onlycap(struct inode *inode, struct file *file) | |
1909 | { | |
1910 | return seq_open(file, &onlycap_seq_ops); | |
1911 | } | |
1912 | ||
1913 | /** | |
1914 | * smk_list_swap_rcu - swap public list with a private one in RCU-safe way | |
1915 | * The caller must hold appropriate mutex to prevent concurrent modifications | |
1916 | * to the public list. | |
1917 | * Private list is assumed to be not accessible to other threads yet. | |
1918 | * | |
1919 | * @public: public list | |
1920 | * @private: private list | |
1921 | */ | |
1922 | static void smk_list_swap_rcu(struct list_head *public, | |
1923 | struct list_head *private) | |
1924 | { | |
1925 | struct list_head *first, *last; | |
1926 | ||
1927 | if (list_empty(public)) { | |
1928 | list_splice_init_rcu(private, public, synchronize_rcu); | |
1929 | } else { | |
1930 | /* Remember public list before replacing it */ | |
1931 | first = public->next; | |
1932 | last = public->prev; | |
1933 | ||
1934 | /* Publish private list in place of public in RCU-safe way */ | |
1935 | private->prev->next = public; | |
1936 | private->next->prev = public; | |
1937 | rcu_assign_pointer(public->next, private->next); | |
1938 | public->prev = private->prev; | |
1939 | ||
1940 | synchronize_rcu(); | |
1941 | ||
1942 | /* When all readers are done with the old public list, | |
1943 | * attach it in place of private */ | |
1944 | private->next = first; | |
1945 | private->prev = last; | |
1946 | first->prev = private; | |
1947 | last->next = private; | |
1948 | } | |
15446235 CS |
1949 | } |
1950 | ||
38416e53 ZJ |
1951 | /** |
1952 | * smk_parse_label_list - parse list of Smack labels, separated by spaces | |
1953 | * | |
1954 | * @data: the string to parse | |
1955 | * @private: destination list | |
1956 | * | |
1957 | * Returns zero on success or error code, as appropriate | |
1958 | */ | |
1959 | static int smk_parse_label_list(char *data, struct list_head *list) | |
1960 | { | |
1961 | char *tok; | |
1962 | struct smack_known *skp; | |
1963 | struct smack_known_list_elem *sklep; | |
1964 | ||
1965 | while ((tok = strsep(&data, " ")) != NULL) { | |
1966 | if (!*tok) | |
1967 | continue; | |
1968 | ||
1969 | skp = smk_import_entry(tok, 0); | |
1970 | if (IS_ERR(skp)) | |
1971 | return PTR_ERR(skp); | |
1972 | ||
1973 | sklep = kzalloc(sizeof(*sklep), GFP_KERNEL); | |
1974 | if (sklep == NULL) | |
1975 | return -ENOMEM; | |
1976 | ||
1977 | sklep->smk_label = skp; | |
1978 | list_add(&sklep->list, list); | |
1979 | } | |
1980 | ||
1981 | return 0; | |
1982 | } | |
1983 | ||
1984 | /** | |
1985 | * smk_destroy_label_list - destroy a list of smack_known_list_elem | |
1986 | * @head: header pointer of the list to destroy | |
1987 | */ | |
1988 | void smk_destroy_label_list(struct list_head *list) | |
1989 | { | |
1990 | struct smack_known_list_elem *sklep; | |
1991 | struct smack_known_list_elem *sklep2; | |
1992 | ||
1993 | list_for_each_entry_safe(sklep, sklep2, list, list) | |
1994 | kfree(sklep); | |
1995 | ||
1996 | INIT_LIST_HEAD(list); | |
1997 | } | |
1998 | ||
15446235 | 1999 | /** |
00f84f3f | 2000 | * smk_write_onlycap - write() for smackfs/onlycap |
251a2a95 | 2001 | * @file: file pointer, not actually used |
15446235 CS |
2002 | * @buf: where to get the data from |
2003 | * @count: bytes sent | |
2004 | * @ppos: where to start | |
2005 | * | |
2006 | * Returns number of bytes written or error code, as appropriate | |
2007 | */ | |
2008 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
2009 | size_t count, loff_t *ppos) | |
2010 | { | |
f7112e6c | 2011 | char *data; |
c0d77c88 | 2012 | LIST_HEAD(list_tmp); |
38416e53 | 2013 | int rc; |
15446235 | 2014 | |
1880eff7 | 2015 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
2016 | return -EPERM; |
2017 | ||
16e5c1fc AV |
2018 | data = memdup_user_nul(buf, count); |
2019 | if (IS_ERR(data)) | |
2020 | return PTR_ERR(data); | |
e774ad68 | 2021 | |
38416e53 | 2022 | rc = smk_parse_label_list(data, &list_tmp); |
c0d77c88 RK |
2023 | kfree(data); |
2024 | ||
15446235 | 2025 | /* |
e774ad68 LP |
2026 | * Clear the smack_onlycap on invalid label errors. This means |
2027 | * that we can pass a null string to unset the onlycap value. | |
f7112e6c | 2028 | * |
e774ad68 | 2029 | * Importing will also reject a label beginning with '-', |
f7112e6c | 2030 | * so "-usecapabilities" will also work. |
e774ad68 LP |
2031 | * |
2032 | * But do so only on invalid label, not on system errors. | |
c0d77c88 | 2033 | * The invalid label must be first to count as clearing attempt. |
15446235 | 2034 | */ |
38416e53 | 2035 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { |
c0d77c88 RK |
2036 | mutex_lock(&smack_onlycap_lock); |
2037 | smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); | |
2038 | mutex_unlock(&smack_onlycap_lock); | |
38416e53 | 2039 | rc = count; |
e774ad68 LP |
2040 | } |
2041 | ||
38416e53 | 2042 | smk_destroy_label_list(&list_tmp); |
15446235 | 2043 | |
f7112e6c | 2044 | return rc; |
15446235 CS |
2045 | } |
2046 | ||
2047 | static const struct file_operations smk_onlycap_ops = { | |
c0d77c88 RK |
2048 | .open = smk_open_onlycap, |
2049 | .read = seq_read, | |
15446235 | 2050 | .write = smk_write_onlycap, |
c0d77c88 RK |
2051 | .llseek = seq_lseek, |
2052 | .release = seq_release, | |
15446235 CS |
2053 | }; |
2054 | ||
bf4b2fee CS |
2055 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2056 | /** | |
2057 | * smk_read_unconfined - read() for smackfs/unconfined | |
2058 | * @filp: file pointer, not actually used | |
2059 | * @buf: where to put the result | |
2060 | * @cn: maximum to send along | |
2061 | * @ppos: where to start | |
2062 | * | |
2063 | * Returns number of bytes read or error code, as appropriate | |
2064 | */ | |
2065 | static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, | |
2066 | size_t cn, loff_t *ppos) | |
2067 | { | |
2068 | char *smack = ""; | |
2069 | ssize_t rc = -EINVAL; | |
2070 | int asize; | |
2071 | ||
2072 | if (*ppos != 0) | |
2073 | return 0; | |
2074 | ||
2075 | if (smack_unconfined != NULL) | |
2076 | smack = smack_unconfined->smk_known; | |
2077 | ||
2078 | asize = strlen(smack) + 1; | |
2079 | ||
2080 | if (cn >= asize) | |
2081 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
2082 | ||
2083 | return rc; | |
2084 | } | |
2085 | ||
2086 | /** | |
2087 | * smk_write_unconfined - write() for smackfs/unconfined | |
2088 | * @file: file pointer, not actually used | |
2089 | * @buf: where to get the data from | |
2090 | * @count: bytes sent | |
2091 | * @ppos: where to start | |
2092 | * | |
2093 | * Returns number of bytes written or error code, as appropriate | |
2094 | */ | |
2095 | static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, | |
2096 | size_t count, loff_t *ppos) | |
2097 | { | |
2098 | char *data; | |
e774ad68 | 2099 | struct smack_known *skp; |
bf4b2fee CS |
2100 | int rc = count; |
2101 | ||
2102 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2103 | return -EPERM; | |
2104 | ||
16e5c1fc AV |
2105 | data = memdup_user_nul(buf, count); |
2106 | if (IS_ERR(data)) | |
2107 | return PTR_ERR(data); | |
e774ad68 | 2108 | |
bf4b2fee | 2109 | /* |
e774ad68 LP |
2110 | * Clear the smack_unconfined on invalid label errors. This means |
2111 | * that we can pass a null string to unset the unconfined value. | |
bf4b2fee | 2112 | * |
e774ad68 | 2113 | * Importing will also reject a label beginning with '-', |
bf4b2fee | 2114 | * so "-confine" will also work. |
e774ad68 LP |
2115 | * |
2116 | * But do so only on invalid label, not on system errors. | |
bf4b2fee | 2117 | */ |
e774ad68 LP |
2118 | skp = smk_import_entry(data, count); |
2119 | if (PTR_ERR(skp) == -EINVAL) | |
2120 | skp = NULL; | |
2121 | else if (IS_ERR(skp)) { | |
2122 | rc = PTR_ERR(skp); | |
2123 | goto freeout; | |
2124 | } | |
2125 | ||
2126 | smack_unconfined = skp; | |
bf4b2fee | 2127 | |
e774ad68 | 2128 | freeout: |
bf4b2fee CS |
2129 | kfree(data); |
2130 | return rc; | |
2131 | } | |
2132 | ||
2133 | static const struct file_operations smk_unconfined_ops = { | |
2134 | .read = smk_read_unconfined, | |
2135 | .write = smk_write_unconfined, | |
2136 | .llseek = default_llseek, | |
2137 | }; | |
2138 | #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ | |
2139 | ||
ecfcc53f EB |
2140 | /** |
2141 | * smk_read_logging - read() for /smack/logging | |
2142 | * @filp: file pointer, not actually used | |
2143 | * @buf: where to put the result | |
2144 | * @cn: maximum to send along | |
2145 | * @ppos: where to start | |
2146 | * | |
2147 | * Returns number of bytes read or error code, as appropriate | |
2148 | */ | |
2149 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
2150 | size_t count, loff_t *ppos) | |
2151 | { | |
2152 | char temp[32]; | |
2153 | ssize_t rc; | |
2154 | ||
2155 | if (*ppos != 0) | |
2156 | return 0; | |
2157 | ||
2158 | sprintf(temp, "%d\n", log_policy); | |
2159 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2160 | return rc; | |
2161 | } | |
2162 | ||
2163 | /** | |
2164 | * smk_write_logging - write() for /smack/logging | |
2165 | * @file: file pointer, not actually used | |
2166 | * @buf: where to get the data from | |
2167 | * @count: bytes sent | |
2168 | * @ppos: where to start | |
2169 | * | |
2170 | * Returns number of bytes written or error code, as appropriate | |
2171 | */ | |
2172 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
2173 | size_t count, loff_t *ppos) | |
2174 | { | |
2175 | char temp[32]; | |
2176 | int i; | |
2177 | ||
1880eff7 | 2178 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
2179 | return -EPERM; |
2180 | ||
2181 | if (count >= sizeof(temp) || count == 0) | |
2182 | return -EINVAL; | |
2183 | ||
2184 | if (copy_from_user(temp, buf, count) != 0) | |
2185 | return -EFAULT; | |
2186 | ||
2187 | temp[count] = '\0'; | |
2188 | ||
2189 | if (sscanf(temp, "%d", &i) != 1) | |
2190 | return -EINVAL; | |
2191 | if (i < 0 || i > 3) | |
2192 | return -EINVAL; | |
2193 | log_policy = i; | |
2194 | return count; | |
2195 | } | |
2196 | ||
2197 | ||
2198 | ||
2199 | static const struct file_operations smk_logging_ops = { | |
2200 | .read = smk_read_logging, | |
2201 | .write = smk_write_logging, | |
6038f373 | 2202 | .llseek = default_llseek, |
ecfcc53f | 2203 | }; |
7898e1f8 CS |
2204 | |
2205 | /* | |
2206 | * Seq_file read operations for /smack/load-self | |
2207 | */ | |
2208 | ||
2209 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
2210 | { | |
2211 | struct task_smack *tsp = current_security(); | |
2212 | ||
40809565 | 2213 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
2214 | } |
2215 | ||
2216 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2217 | { | |
2218 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 2219 | |
40809565 | 2220 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
2221 | } |
2222 | ||
2223 | static int load_self_seq_show(struct seq_file *s, void *v) | |
2224 | { | |
2225 | struct list_head *list = v; | |
2226 | struct smack_rule *srp = | |
01fa8474 | 2227 | list_entry_rcu(list, struct smack_rule, list); |
7898e1f8 | 2228 | |
f7112e6c | 2229 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
2230 | |
2231 | return 0; | |
2232 | } | |
2233 | ||
7898e1f8 CS |
2234 | static const struct seq_operations load_self_seq_ops = { |
2235 | .start = load_self_seq_start, | |
2236 | .next = load_self_seq_next, | |
2237 | .show = load_self_seq_show, | |
40809565 | 2238 | .stop = smk_seq_stop, |
7898e1f8 CS |
2239 | }; |
2240 | ||
2241 | ||
2242 | /** | |
f7112e6c | 2243 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
2244 | * @inode: inode structure representing file |
2245 | * @file: "load" file pointer | |
2246 | * | |
2247 | * For reading, use load_seq_* seq_file reading operations. | |
2248 | */ | |
2249 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
2250 | { | |
2251 | return seq_open(file, &load_self_seq_ops); | |
2252 | } | |
2253 | ||
2254 | /** | |
2255 | * smk_write_load_self - write() for /smack/load-self | |
2256 | * @file: file pointer, not actually used | |
2257 | * @buf: where to get the data from | |
2258 | * @count: bytes sent | |
2259 | * @ppos: where to start - must be 0 | |
2260 | * | |
2261 | */ | |
2262 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
2263 | size_t count, loff_t *ppos) | |
2264 | { | |
2265 | struct task_smack *tsp = current_security(); | |
2266 | ||
f7112e6c CS |
2267 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
2268 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
2269 | } |
2270 | ||
2271 | static const struct file_operations smk_load_self_ops = { | |
2272 | .open = smk_open_load_self, | |
2273 | .read = seq_read, | |
2274 | .llseek = seq_lseek, | |
2275 | .write = smk_write_load_self, | |
2276 | .release = seq_release, | |
2277 | }; | |
828716c2 JS |
2278 | |
2279 | /** | |
f7112e6c | 2280 | * smk_user_access - handle access check transaction |
828716c2 JS |
2281 | * @file: file pointer |
2282 | * @buf: data from user space | |
2283 | * @count: bytes sent | |
2284 | * @ppos: where to start - must be 0 | |
2285 | */ | |
f7112e6c CS |
2286 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
2287 | size_t count, loff_t *ppos, int format) | |
828716c2 | 2288 | { |
e05b6f98 | 2289 | struct smack_parsed_rule rule; |
828716c2 | 2290 | char *data; |
f8859d98 | 2291 | int res; |
828716c2 | 2292 | |
828716c2 JS |
2293 | data = simple_transaction_get(file, buf, count); |
2294 | if (IS_ERR(data)) | |
2295 | return PTR_ERR(data); | |
2296 | ||
f7112e6c CS |
2297 | if (format == SMK_FIXED24_FMT) { |
2298 | if (count < SMK_LOADLEN) | |
2299 | return -EINVAL; | |
2300 | res = smk_parse_rule(data, &rule, 0); | |
2301 | } else { | |
2302 | /* | |
10289b0f | 2303 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 2304 | */ |
10289b0f | 2305 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
2306 | } |
2307 | ||
398ce073 JS |
2308 | if (res >= 0) |
2309 | res = smk_access(rule.smk_subject, rule.smk_object, | |
2310 | rule.smk_access1, NULL); | |
2311 | else if (res != -ENOENT) | |
e774ad68 | 2312 | return res; |
828716c2 | 2313 | |
d166c802 CS |
2314 | /* |
2315 | * smk_access() can return a value > 0 in the "bringup" case. | |
2316 | */ | |
2317 | data[0] = res >= 0 ? '1' : '0'; | |
f8859d98 | 2318 | data[1] = '\0'; |
828716c2 | 2319 | |
d86b2b61 | 2320 | simple_transaction_set(file, 2); |
f7112e6c CS |
2321 | |
2322 | if (format == SMK_FIXED24_FMT) | |
2323 | return SMK_LOADLEN; | |
2324 | return count; | |
2325 | } | |
2326 | ||
2327 | /** | |
2328 | * smk_write_access - handle access check transaction | |
2329 | * @file: file pointer | |
2330 | * @buf: data from user space | |
2331 | * @count: bytes sent | |
2332 | * @ppos: where to start - must be 0 | |
2333 | */ | |
2334 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
2335 | size_t count, loff_t *ppos) | |
2336 | { | |
2337 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
2338 | } |
2339 | ||
2340 | static const struct file_operations smk_access_ops = { | |
2341 | .write = smk_write_access, | |
2342 | .read = simple_transaction_read, | |
2343 | .release = simple_transaction_release, | |
2344 | .llseek = generic_file_llseek, | |
2345 | }; | |
2346 | ||
f7112e6c CS |
2347 | |
2348 | /* | |
2349 | * Seq_file read operations for /smack/load2 | |
2350 | */ | |
2351 | ||
2352 | static int load2_seq_show(struct seq_file *s, void *v) | |
2353 | { | |
2354 | struct list_head *list = v; | |
2355 | struct smack_master_list *smlp = | |
01fa8474 | 2356 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
2357 | |
2358 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
2359 | ||
2360 | return 0; | |
2361 | } | |
2362 | ||
2363 | static const struct seq_operations load2_seq_ops = { | |
2364 | .start = load2_seq_start, | |
2365 | .next = load2_seq_next, | |
2366 | .show = load2_seq_show, | |
2367 | .stop = smk_seq_stop, | |
2368 | }; | |
2369 | ||
2370 | /** | |
2371 | * smk_open_load2 - open() for /smack/load2 | |
2372 | * @inode: inode structure representing file | |
2373 | * @file: "load2" file pointer | |
2374 | * | |
2375 | * For reading, use load2_seq_* seq_file reading operations. | |
2376 | */ | |
2377 | static int smk_open_load2(struct inode *inode, struct file *file) | |
2378 | { | |
2379 | return seq_open(file, &load2_seq_ops); | |
2380 | } | |
2381 | ||
2382 | /** | |
2383 | * smk_write_load2 - write() for /smack/load2 | |
2384 | * @file: file pointer, not actually used | |
2385 | * @buf: where to get the data from | |
2386 | * @count: bytes sent | |
2387 | * @ppos: where to start - must be 0 | |
2388 | * | |
2389 | */ | |
2390 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
2391 | size_t count, loff_t *ppos) | |
2392 | { | |
2393 | /* | |
2394 | * Must have privilege. | |
2395 | */ | |
1880eff7 | 2396 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
2397 | return -EPERM; |
2398 | ||
2399 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2400 | SMK_LONG_FMT); | |
2401 | } | |
2402 | ||
2403 | static const struct file_operations smk_load2_ops = { | |
2404 | .open = smk_open_load2, | |
2405 | .read = seq_read, | |
2406 | .llseek = seq_lseek, | |
2407 | .write = smk_write_load2, | |
2408 | .release = seq_release, | |
2409 | }; | |
2410 | ||
2411 | /* | |
2412 | * Seq_file read operations for /smack/load-self2 | |
2413 | */ | |
2414 | ||
2415 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
2416 | { | |
2417 | struct task_smack *tsp = current_security(); | |
2418 | ||
2419 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
2420 | } | |
2421 | ||
2422 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2423 | { | |
2424 | struct task_smack *tsp = current_security(); | |
2425 | ||
2426 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
2427 | } | |
2428 | ||
2429 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
2430 | { | |
2431 | struct list_head *list = v; | |
2432 | struct smack_rule *srp = | |
01fa8474 | 2433 | list_entry_rcu(list, struct smack_rule, list); |
f7112e6c CS |
2434 | |
2435 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
2436 | ||
2437 | return 0; | |
2438 | } | |
2439 | ||
2440 | static const struct seq_operations load_self2_seq_ops = { | |
2441 | .start = load_self2_seq_start, | |
2442 | .next = load_self2_seq_next, | |
2443 | .show = load_self2_seq_show, | |
2444 | .stop = smk_seq_stop, | |
2445 | }; | |
2446 | ||
2447 | /** | |
2448 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2449 | * @inode: inode structure representing file | |
2450 | * @file: "load" file pointer | |
2451 | * | |
2452 | * For reading, use load_seq_* seq_file reading operations. | |
2453 | */ | |
2454 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2455 | { | |
2456 | return seq_open(file, &load_self2_seq_ops); | |
2457 | } | |
2458 | ||
2459 | /** | |
2460 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2461 | * @file: file pointer, not actually used | |
2462 | * @buf: where to get the data from | |
2463 | * @count: bytes sent | |
2464 | * @ppos: where to start - must be 0 | |
2465 | * | |
2466 | */ | |
2467 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2468 | size_t count, loff_t *ppos) | |
2469 | { | |
2470 | struct task_smack *tsp = current_security(); | |
2471 | ||
2472 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2473 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2474 | } | |
2475 | ||
2476 | static const struct file_operations smk_load_self2_ops = { | |
2477 | .open = smk_open_load_self2, | |
2478 | .read = seq_read, | |
2479 | .llseek = seq_lseek, | |
2480 | .write = smk_write_load_self2, | |
2481 | .release = seq_release, | |
2482 | }; | |
2483 | ||
2484 | /** | |
2485 | * smk_write_access2 - handle access check transaction | |
2486 | * @file: file pointer | |
2487 | * @buf: data from user space | |
2488 | * @count: bytes sent | |
2489 | * @ppos: where to start - must be 0 | |
2490 | */ | |
2491 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2492 | size_t count, loff_t *ppos) | |
2493 | { | |
2494 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2495 | } | |
2496 | ||
2497 | static const struct file_operations smk_access2_ops = { | |
2498 | .write = smk_write_access2, | |
2499 | .read = simple_transaction_read, | |
2500 | .release = simple_transaction_release, | |
2501 | .llseek = generic_file_llseek, | |
2502 | }; | |
2503 | ||
449543b0 RK |
2504 | /** |
2505 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2506 | * @file: file pointer | |
2507 | * @buf: data from user space | |
2508 | * @count: bytes sent | |
2509 | * @ppos: where to start - must be 0 | |
2510 | */ | |
2511 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2512 | size_t count, loff_t *ppos) | |
2513 | { | |
54302094 DC |
2514 | char *data; |
2515 | const char *cp; | |
449543b0 RK |
2516 | struct smack_known *skp; |
2517 | struct smack_rule *sp; | |
2518 | struct list_head *rule_list; | |
2519 | struct mutex *rule_lock; | |
2520 | int rc = count; | |
2521 | ||
2522 | if (*ppos != 0) | |
2523 | return -EINVAL; | |
2524 | ||
2525 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2526 | return -EPERM; | |
2527 | ||
2528 | if (count == 0 || count > SMK_LONGLABEL) | |
2529 | return -EINVAL; | |
2530 | ||
63e24c49 ME |
2531 | data = memdup_user(buf, count); |
2532 | if (IS_ERR(data)) | |
2533 | return PTR_ERR(data); | |
449543b0 RK |
2534 | |
2535 | cp = smk_parse_smack(data, count); | |
e774ad68 LP |
2536 | if (IS_ERR(cp)) { |
2537 | rc = PTR_ERR(cp); | |
54302094 | 2538 | goto out_data; |
449543b0 RK |
2539 | } |
2540 | ||
2541 | skp = smk_find_entry(cp); | |
d15d9fad | 2542 | if (skp == NULL) |
54302094 | 2543 | goto out_cp; |
449543b0 RK |
2544 | |
2545 | rule_list = &skp->smk_rules; | |
2546 | rule_lock = &skp->smk_rules_lock; | |
2547 | ||
2548 | mutex_lock(rule_lock); | |
2549 | ||
2550 | list_for_each_entry_rcu(sp, rule_list, list) | |
2551 | sp->smk_access = 0; | |
2552 | ||
2553 | mutex_unlock(rule_lock); | |
2554 | ||
54302094 | 2555 | out_cp: |
449543b0 | 2556 | kfree(cp); |
54302094 DC |
2557 | out_data: |
2558 | kfree(data); | |
2559 | ||
449543b0 RK |
2560 | return rc; |
2561 | } | |
2562 | ||
2563 | static const struct file_operations smk_revoke_subj_ops = { | |
2564 | .write = smk_write_revoke_subj, | |
2565 | .read = simple_transaction_read, | |
2566 | .release = simple_transaction_release, | |
2567 | .llseek = generic_file_llseek, | |
2568 | }; | |
2569 | ||
e9307237 CS |
2570 | /** |
2571 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2572 | * | |
2573 | */ | |
2574 | static int smk_init_sysfs(void) | |
2575 | { | |
ca70d27e | 2576 | return sysfs_create_mount_point(fs_kobj, "smackfs"); |
e9307237 CS |
2577 | } |
2578 | ||
e05b6f98 RK |
2579 | /** |
2580 | * smk_write_change_rule - write() for /smack/change-rule | |
2581 | * @file: file pointer | |
2582 | * @buf: data from user space | |
2583 | * @count: bytes sent | |
2584 | * @ppos: where to start - must be 0 | |
2585 | */ | |
2586 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2587 | size_t count, loff_t *ppos) | |
2588 | { | |
2589 | /* | |
2590 | * Must have privilege. | |
2591 | */ | |
4afde48b | 2592 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e05b6f98 RK |
2593 | return -EPERM; |
2594 | ||
2595 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2596 | SMK_CHANGE_FMT); | |
2597 | } | |
2598 | ||
2599 | static const struct file_operations smk_change_rule_ops = { | |
2600 | .write = smk_write_change_rule, | |
2601 | .read = simple_transaction_read, | |
2602 | .release = simple_transaction_release, | |
2603 | .llseek = generic_file_llseek, | |
2604 | }; | |
2605 | ||
e114e473 | 2606 | /** |
00f84f3f CS |
2607 | * smk_read_syslog - read() for smackfs/syslog |
2608 | * @filp: file pointer, not actually used | |
2609 | * @buf: where to put the result | |
2610 | * @cn: maximum to send along | |
2611 | * @ppos: where to start | |
2612 | * | |
2613 | * Returns number of bytes read or error code, as appropriate | |
2614 | */ | |
2615 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, | |
2616 | size_t cn, loff_t *ppos) | |
2617 | { | |
2618 | struct smack_known *skp; | |
2619 | ssize_t rc = -EINVAL; | |
2620 | int asize; | |
2621 | ||
2622 | if (*ppos != 0) | |
2623 | return 0; | |
2624 | ||
2625 | if (smack_syslog_label == NULL) | |
2626 | skp = &smack_known_star; | |
2627 | else | |
2628 | skp = smack_syslog_label; | |
2629 | ||
2630 | asize = strlen(skp->smk_known) + 1; | |
2631 | ||
2632 | if (cn >= asize) | |
2633 | rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, | |
2634 | asize); | |
2635 | ||
2636 | return rc; | |
2637 | } | |
2638 | ||
2639 | /** | |
2640 | * smk_write_syslog - write() for smackfs/syslog | |
2641 | * @file: file pointer, not actually used | |
2642 | * @buf: where to get the data from | |
2643 | * @count: bytes sent | |
2644 | * @ppos: where to start | |
2645 | * | |
2646 | * Returns number of bytes written or error code, as appropriate | |
2647 | */ | |
2648 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, | |
2649 | size_t count, loff_t *ppos) | |
2650 | { | |
2651 | char *data; | |
2652 | struct smack_known *skp; | |
2653 | int rc = count; | |
2654 | ||
2655 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2656 | return -EPERM; | |
2657 | ||
16e5c1fc AV |
2658 | data = memdup_user_nul(buf, count); |
2659 | if (IS_ERR(data)) | |
2660 | return PTR_ERR(data); | |
00f84f3f | 2661 | |
16e5c1fc AV |
2662 | skp = smk_import_entry(data, count); |
2663 | if (IS_ERR(skp)) | |
2664 | rc = PTR_ERR(skp); | |
2665 | else | |
2666 | smack_syslog_label = skp; | |
00f84f3f CS |
2667 | |
2668 | kfree(data); | |
2669 | return rc; | |
2670 | } | |
2671 | ||
2672 | static const struct file_operations smk_syslog_ops = { | |
2673 | .read = smk_read_syslog, | |
2674 | .write = smk_write_syslog, | |
2675 | .llseek = default_llseek, | |
2676 | }; | |
2677 | ||
38416e53 ZJ |
2678 | /* |
2679 | * Seq_file read operations for /smack/relabel-self | |
2680 | */ | |
2681 | ||
2682 | static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos) | |
2683 | { | |
2684 | struct task_smack *tsp = current_security(); | |
2685 | ||
2686 | return smk_seq_start(s, pos, &tsp->smk_relabel); | |
2687 | } | |
2688 | ||
2689 | static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2690 | { | |
2691 | struct task_smack *tsp = current_security(); | |
2692 | ||
2693 | return smk_seq_next(s, v, pos, &tsp->smk_relabel); | |
2694 | } | |
2695 | ||
2696 | static int relabel_self_seq_show(struct seq_file *s, void *v) | |
2697 | { | |
2698 | struct list_head *list = v; | |
2699 | struct smack_known_list_elem *sklep = | |
2700 | list_entry(list, struct smack_known_list_elem, list); | |
2701 | ||
2702 | seq_puts(s, sklep->smk_label->smk_known); | |
2703 | seq_putc(s, ' '); | |
2704 | ||
2705 | return 0; | |
2706 | } | |
2707 | ||
2708 | static const struct seq_operations relabel_self_seq_ops = { | |
2709 | .start = relabel_self_seq_start, | |
2710 | .next = relabel_self_seq_next, | |
2711 | .show = relabel_self_seq_show, | |
2712 | .stop = smk_seq_stop, | |
2713 | }; | |
2714 | ||
2715 | /** | |
2716 | * smk_open_relabel_self - open() for /smack/relabel-self | |
2717 | * @inode: inode structure representing file | |
2718 | * @file: "relabel-self" file pointer | |
2719 | * | |
2720 | * Connect our relabel_self_seq_* operations with /smack/relabel-self | |
2721 | * file_operations | |
2722 | */ | |
2723 | static int smk_open_relabel_self(struct inode *inode, struct file *file) | |
2724 | { | |
2725 | return seq_open(file, &relabel_self_seq_ops); | |
2726 | } | |
2727 | ||
2728 | /** | |
2729 | * smk_write_relabel_self - write() for /smack/relabel-self | |
2730 | * @file: file pointer, not actually used | |
2731 | * @buf: where to get the data from | |
2732 | * @count: bytes sent | |
2733 | * @ppos: where to start - must be 0 | |
2734 | * | |
2735 | */ | |
2736 | static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, | |
2737 | size_t count, loff_t *ppos) | |
2738 | { | |
2739 | struct task_smack *tsp = current_security(); | |
2740 | char *data; | |
2741 | int rc; | |
2742 | LIST_HEAD(list_tmp); | |
2743 | ||
2744 | /* | |
2745 | * Must have privilege. | |
2746 | */ | |
2747 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2748 | return -EPERM; | |
2749 | ||
2750 | /* | |
2751 | * Enough data must be present. | |
2752 | */ | |
2753 | if (*ppos != 0) | |
2754 | return -EINVAL; | |
2755 | ||
16e5c1fc AV |
2756 | data = memdup_user_nul(buf, count); |
2757 | if (IS_ERR(data)) | |
2758 | return PTR_ERR(data); | |
38416e53 ZJ |
2759 | |
2760 | rc = smk_parse_label_list(data, &list_tmp); | |
2761 | kfree(data); | |
2762 | ||
2763 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { | |
2764 | smk_destroy_label_list(&tsp->smk_relabel); | |
2765 | list_splice(&list_tmp, &tsp->smk_relabel); | |
2766 | return count; | |
2767 | } | |
2768 | ||
2769 | smk_destroy_label_list(&list_tmp); | |
2770 | return rc; | |
2771 | } | |
2772 | ||
2773 | static const struct file_operations smk_relabel_self_ops = { | |
2774 | .open = smk_open_relabel_self, | |
2775 | .read = seq_read, | |
2776 | .llseek = seq_lseek, | |
2777 | .write = smk_write_relabel_self, | |
2778 | .release = seq_release, | |
2779 | }; | |
00f84f3f | 2780 | |
66867818 LP |
2781 | /** |
2782 | * smk_read_ptrace - read() for /smack/ptrace | |
2783 | * @filp: file pointer, not actually used | |
2784 | * @buf: where to put the result | |
2785 | * @count: maximum to send along | |
2786 | * @ppos: where to start | |
2787 | * | |
2788 | * Returns number of bytes read or error code, as appropriate | |
2789 | */ | |
2790 | static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, | |
2791 | size_t count, loff_t *ppos) | |
2792 | { | |
2793 | char temp[32]; | |
2794 | ssize_t rc; | |
2795 | ||
2796 | if (*ppos != 0) | |
2797 | return 0; | |
2798 | ||
2799 | sprintf(temp, "%d\n", smack_ptrace_rule); | |
2800 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2801 | return rc; | |
2802 | } | |
2803 | ||
2804 | /** | |
2805 | * smk_write_ptrace - write() for /smack/ptrace | |
2806 | * @file: file pointer | |
2807 | * @buf: data from user space | |
2808 | * @count: bytes sent | |
2809 | * @ppos: where to start - must be 0 | |
2810 | */ | |
2811 | static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, | |
2812 | size_t count, loff_t *ppos) | |
2813 | { | |
2814 | char temp[32]; | |
2815 | int i; | |
2816 | ||
2817 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2818 | return -EPERM; | |
2819 | ||
2820 | if (*ppos != 0 || count >= sizeof(temp) || count == 0) | |
2821 | return -EINVAL; | |
2822 | ||
2823 | if (copy_from_user(temp, buf, count) != 0) | |
2824 | return -EFAULT; | |
2825 | ||
2826 | temp[count] = '\0'; | |
2827 | ||
2828 | if (sscanf(temp, "%d", &i) != 1) | |
2829 | return -EINVAL; | |
2830 | if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) | |
2831 | return -EINVAL; | |
2832 | smack_ptrace_rule = i; | |
2833 | ||
2834 | return count; | |
2835 | } | |
2836 | ||
2837 | static const struct file_operations smk_ptrace_ops = { | |
2838 | .write = smk_write_ptrace, | |
2839 | .read = smk_read_ptrace, | |
2840 | .llseek = default_llseek, | |
2841 | }; | |
2842 | ||
00f84f3f CS |
2843 | /** |
2844 | * smk_fill_super - fill the smackfs superblock | |
e114e473 CS |
2845 | * @sb: the empty superblock |
2846 | * @data: unused | |
2847 | * @silent: unused | |
2848 | * | |
00f84f3f | 2849 | * Fill in the well known entries for the smack filesystem |
e114e473 CS |
2850 | * |
2851 | * Returns 0 on success, an error code on failure | |
2852 | */ | |
2853 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2854 | { | |
2855 | int rc; | |
2856 | struct inode *root_inode; | |
2857 | ||
cda37124 | 2858 | static const struct tree_descr smack_files[] = { |
7898e1f8 CS |
2859 | [SMK_LOAD] = { |
2860 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2861 | [SMK_CIPSO] = { | |
2862 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2863 | [SMK_DOI] = { | |
2864 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2865 | [SMK_DIRECT] = { | |
2866 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2867 | [SMK_AMBIENT] = { | |
2868 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
21abb1ec CS |
2869 | [SMK_NET4ADDR] = { |
2870 | "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2871 | [SMK_ONLYCAP] = { |
2872 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2873 | [SMK_LOGGING] = { | |
2874 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2875 | [SMK_LOAD_SELF] = { | |
2876 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2877 | [SMK_ACCESSES] = { |
0e94ae17 | 2878 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2879 | [SMK_MAPPED] = { |
2880 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2881 | [SMK_LOAD2] = { | |
2882 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2883 | [SMK_LOAD_SELF2] = { | |
2884 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2885 | [SMK_ACCESS2] = { | |
2886 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2887 | [SMK_CIPSO2] = { | |
2888 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2889 | [SMK_REVOKE_SUBJ] = { |
2890 | "revoke-subject", &smk_revoke_subj_ops, | |
2891 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2892 | [SMK_CHANGE_RULE] = { |
2893 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
00f84f3f CS |
2894 | [SMK_SYSLOG] = { |
2895 | "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, | |
66867818 LP |
2896 | [SMK_PTRACE] = { |
2897 | "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, | |
bf4b2fee CS |
2898 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2899 | [SMK_UNCONFINED] = { | |
2900 | "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, | |
2901 | #endif | |
21abb1ec CS |
2902 | #if IS_ENABLED(CONFIG_IPV6) |
2903 | [SMK_NET6ADDR] = { | |
2904 | "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR}, | |
2905 | #endif /* CONFIG_IPV6 */ | |
38416e53 ZJ |
2906 | [SMK_RELABEL_SELF] = { |
2907 | "relabel-self", &smk_relabel_self_ops, | |
2908 | S_IRUGO|S_IWUGO}, | |
7898e1f8 CS |
2909 | /* last one */ |
2910 | {""} | |
e114e473 CS |
2911 | }; |
2912 | ||
2913 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2914 | if (rc != 0) { | |
2915 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2916 | __func__, rc); | |
2917 | return rc; | |
2918 | } | |
2919 | ||
ce0b16dd | 2920 | root_inode = d_inode(sb->s_root); |
e114e473 CS |
2921 | |
2922 | return 0; | |
2923 | } | |
2924 | ||
2925 | /** | |
fc14f2fe | 2926 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2927 | * @fs_type: passed along without comment |
2928 | * @flags: passed along without comment | |
2929 | * @dev_name: passed along without comment | |
2930 | * @data: passed along without comment | |
e114e473 CS |
2931 | * |
2932 | * Just passes everything along. | |
2933 | * | |
2934 | * Returns what the lower level code does. | |
2935 | */ | |
fc14f2fe AV |
2936 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2937 | int flags, const char *dev_name, void *data) | |
e114e473 | 2938 | { |
fc14f2fe | 2939 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2940 | } |
2941 | ||
2942 | static struct file_system_type smk_fs_type = { | |
2943 | .name = "smackfs", | |
fc14f2fe | 2944 | .mount = smk_mount, |
e114e473 CS |
2945 | .kill_sb = kill_litter_super, |
2946 | }; | |
2947 | ||
2948 | static struct vfsmount *smackfs_mount; | |
2949 | ||
f7112e6c CS |
2950 | static int __init smk_preset_netlabel(struct smack_known *skp) |
2951 | { | |
2952 | skp->smk_netlabel.domain = skp->smk_known; | |
2953 | skp->smk_netlabel.flags = | |
2954 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
2955 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
2956 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
2957 | } | |
2958 | ||
e114e473 CS |
2959 | /** |
2960 | * init_smk_fs - get the smackfs superblock | |
2961 | * | |
2962 | * register the smackfs | |
2963 | * | |
076c54c5 AD |
2964 | * Do not register smackfs if Smack wasn't enabled |
2965 | * on boot. We can not put this method normally under the | |
2966 | * smack_init() code path since the security subsystem get | |
2967 | * initialized before the vfs caches. | |
2968 | * | |
2969 | * Returns true if we were not chosen on boot or if | |
2970 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2971 | */ |
2972 | static int __init init_smk_fs(void) | |
2973 | { | |
2974 | int err; | |
f7112e6c | 2975 | int rc; |
e114e473 | 2976 | |
d21b7b04 | 2977 | if (smack_enabled == 0) |
076c54c5 AD |
2978 | return 0; |
2979 | ||
e9307237 CS |
2980 | err = smk_init_sysfs(); |
2981 | if (err) | |
2982 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
2983 | ||
e114e473 CS |
2984 | err = register_filesystem(&smk_fs_type); |
2985 | if (!err) { | |
2986 | smackfs_mount = kern_mount(&smk_fs_type); | |
2987 | if (IS_ERR(smackfs_mount)) { | |
2988 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
2989 | err = PTR_ERR(smackfs_mount); | |
2990 | smackfs_mount = NULL; | |
2991 | } | |
2992 | } | |
2993 | ||
e114e473 | 2994 | smk_cipso_doi(); |
4bc87e62 | 2995 | smk_unlbl_ambient(NULL); |
e114e473 | 2996 | |
f7112e6c CS |
2997 | rc = smk_preset_netlabel(&smack_known_floor); |
2998 | if (err == 0 && rc < 0) | |
2999 | err = rc; | |
3000 | rc = smk_preset_netlabel(&smack_known_hat); | |
3001 | if (err == 0 && rc < 0) | |
3002 | err = rc; | |
3003 | rc = smk_preset_netlabel(&smack_known_huh); | |
f7112e6c CS |
3004 | if (err == 0 && rc < 0) |
3005 | err = rc; | |
3006 | rc = smk_preset_netlabel(&smack_known_star); | |
3007 | if (err == 0 && rc < 0) | |
3008 | err = rc; | |
3009 | rc = smk_preset_netlabel(&smack_known_web); | |
3010 | if (err == 0 && rc < 0) | |
3011 | err = rc; | |
3012 | ||
e114e473 CS |
3013 | return err; |
3014 | } | |
3015 | ||
3016 | __initcall(init_smk_fs); |