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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 | */ | |
e114e473 | 70 | static DEFINE_MUTEX(smack_cipso_lock); |
4bc87e62 | 71 | static DEFINE_MUTEX(smack_ambient_lock); |
21abb1ec CS |
72 | static DEFINE_MUTEX(smk_net4addr_lock); |
73 | #if IS_ENABLED(CONFIG_IPV6) | |
74 | static DEFINE_MUTEX(smk_net6addr_lock); | |
75 | #endif /* CONFIG_IPV6 */ | |
e114e473 CS |
76 | |
77 | /* | |
78 | * This is the "ambient" label for network traffic. | |
79 | * If it isn't somehow marked, use this. | |
80 | * It can be reset via smackfs/ambient | |
81 | */ | |
2f823ff8 | 82 | struct smack_known *smack_net_ambient; |
e114e473 | 83 | |
e114e473 CS |
84 | /* |
85 | * This is the level in a CIPSO header that indicates a | |
86 | * smack label is contained directly in the category set. | |
87 | * It can be reset via smackfs/direct | |
88 | */ | |
89 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
90 | ||
f7112e6c CS |
91 | /* |
92 | * This is the level in a CIPSO header that indicates a | |
93 | * secid is contained directly in the category set. | |
94 | * It can be reset via smackfs/mapped | |
95 | */ | |
96 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; | |
97 | ||
bf4b2fee CS |
98 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
99 | /* | |
100 | * Allow one label to be unconfined. This is for | |
101 | * debugging and application bring-up purposes only. | |
102 | * It is bad and wrong, but everyone seems to expect | |
103 | * to have it. | |
104 | */ | |
105 | struct smack_known *smack_unconfined; | |
106 | #endif | |
107 | ||
00f84f3f CS |
108 | /* |
109 | * If this value is set restrict syslog use to the label specified. | |
110 | * It can be reset via smackfs/syslog | |
111 | */ | |
112 | struct smack_known *smack_syslog_label; | |
15446235 | 113 | |
66867818 LP |
114 | /* |
115 | * Ptrace current rule | |
116 | * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) | |
117 | * SMACK_PTRACE_EXACT labels must match, but can be overriden with | |
118 | * CAP_SYS_PTRACE | |
119 | * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect | |
120 | */ | |
121 | int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; | |
122 | ||
6d3dc07c CS |
123 | /* |
124 | * Certain IP addresses may be designated as single label hosts. | |
125 | * Packets are sent there unlabeled, but only from tasks that | |
126 | * can write to the specified label. | |
127 | */ | |
7198e2ee | 128 | |
21abb1ec CS |
129 | LIST_HEAD(smk_net4addr_list); |
130 | #if IS_ENABLED(CONFIG_IPV6) | |
131 | LIST_HEAD(smk_net6addr_list); | |
132 | #endif /* CONFIG_IPV6 */ | |
272cd7a8 CS |
133 | |
134 | /* | |
135 | * Rule lists are maintained for each label. | |
f7112e6c | 136 | * This master list is just for reading /smack/load and /smack/load2. |
272cd7a8 CS |
137 | */ |
138 | struct smack_master_list { | |
139 | struct list_head list; | |
140 | struct smack_rule *smk_rule; | |
141 | }; | |
142 | ||
1eddfe8e | 143 | static LIST_HEAD(smack_rule_list); |
6d3dc07c | 144 | |
e05b6f98 | 145 | struct smack_parsed_rule { |
2f823ff8 | 146 | struct smack_known *smk_subject; |
21c7eae2 | 147 | struct smack_known *smk_object; |
e05b6f98 RK |
148 | int smk_access1; |
149 | int smk_access2; | |
150 | }; | |
151 | ||
e114e473 | 152 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 153 | |
e114e473 CS |
154 | /* |
155 | * Values for parsing cipso rules | |
156 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
157 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
158 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
159 | */ |
160 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
161 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
162 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
163 | ||
164 | /* | |
165 | * Values for parsing MAC rules | |
166 | * SMK_ACCESS: Maximum possible combination of access permissions | |
167 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
168 | * SMK_LOADLEN: Smack rule length | |
169 | */ | |
5c6d1125 | 170 | #define SMK_OACCESS "rwxa" |
c0ab6e56 | 171 | #define SMK_ACCESS "rwxatl" |
5c6d1125 JS |
172 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
173 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
174 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
175 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 176 | |
f7112e6c CS |
177 | /* |
178 | * Stricly for CIPSO level manipulation. | |
179 | * Set the category bit number in a smack label sized buffer. | |
180 | */ | |
181 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) | |
182 | { | |
183 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) | |
184 | return; | |
185 | ||
186 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
187 | } | |
188 | ||
6d3dc07c CS |
189 | /** |
190 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
191 | * @nap: structure to fill | |
192 | */ | |
193 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
194 | { | |
2f823ff8 CS |
195 | struct smack_known *skp = smk_of_current(); |
196 | ||
6d3dc07c CS |
197 | nap->loginuid = audit_get_loginuid(current); |
198 | nap->sessionid = audit_get_sessionid(current); | |
2f823ff8 | 199 | nap->secid = skp->smk_secid; |
6d3dc07c CS |
200 | } |
201 | ||
202 | /* | |
f7112e6c | 203 | * Value for parsing single label host rules |
6d3dc07c | 204 | * "1.2.3.4 X" |
6d3dc07c CS |
205 | */ |
206 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 207 | |
e114e473 | 208 | /** |
e05b6f98 RK |
209 | * smk_set_access - add a rule to the rule list or replace an old rule |
210 | * @srp: the rule to add or replace | |
7898e1f8 CS |
211 | * @rule_list: the list of rules |
212 | * @rule_lock: the rule list lock | |
e05b6f98 | 213 | * @global: if non-zero, indicates a global rule |
e114e473 CS |
214 | * |
215 | * Looks through the current subject/object/access list for | |
216 | * the subject/object pair and replaces the access that was | |
217 | * there. If the pair isn't found add it with the specified | |
218 | * access. | |
81ea714b SL |
219 | * |
220 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
221 | * during the allocation of the new pair to add. | |
e114e473 | 222 | */ |
e05b6f98 RK |
223 | static int smk_set_access(struct smack_parsed_rule *srp, |
224 | struct list_head *rule_list, | |
225 | struct mutex *rule_lock, int global) | |
e114e473 | 226 | { |
7198e2ee | 227 | struct smack_rule *sp; |
e05b6f98 | 228 | struct smack_master_list *smlp; |
7898e1f8 | 229 | int found = 0; |
e05b6f98 | 230 | int rc = 0; |
e114e473 | 231 | |
7898e1f8 CS |
232 | mutex_lock(rule_lock); |
233 | ||
272cd7a8 CS |
234 | /* |
235 | * Because the object label is less likely to match | |
236 | * than the subject label check it first | |
237 | */ | |
7898e1f8 | 238 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
239 | if (sp->smk_object == srp->smk_object && |
240 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee | 241 | found = 1; |
e05b6f98 RK |
242 | sp->smk_access |= srp->smk_access1; |
243 | sp->smk_access &= ~srp->smk_access2; | |
e114e473 CS |
244 | break; |
245 | } | |
e114e473 CS |
246 | } |
247 | ||
e05b6f98 RK |
248 | if (found == 0) { |
249 | sp = kzalloc(sizeof(*sp), GFP_KERNEL); | |
250 | if (sp == NULL) { | |
251 | rc = -ENOMEM; | |
252 | goto out; | |
253 | } | |
254 | ||
255 | sp->smk_subject = srp->smk_subject; | |
256 | sp->smk_object = srp->smk_object; | |
257 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; | |
258 | ||
259 | list_add_rcu(&sp->list, rule_list); | |
260 | /* | |
261 | * If this is a global as opposed to self and a new rule | |
262 | * it needs to get added for reporting. | |
263 | */ | |
264 | if (global) { | |
265 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
266 | if (smlp != NULL) { | |
267 | smlp->smk_rule = sp; | |
268 | list_add_rcu(&smlp->list, &smack_rule_list); | |
269 | } else | |
270 | rc = -ENOMEM; | |
271 | } | |
272 | } | |
273 | ||
274 | out: | |
7898e1f8 | 275 | mutex_unlock(rule_lock); |
e05b6f98 RK |
276 | return rc; |
277 | } | |
278 | ||
279 | /** | |
280 | * smk_perm_from_str - parse smack accesses from a text string | |
281 | * @string: a text string that contains a Smack accesses code | |
282 | * | |
283 | * Returns an integer with respective bits set for specified accesses. | |
284 | */ | |
285 | static int smk_perm_from_str(const char *string) | |
286 | { | |
287 | int perm = 0; | |
288 | const char *cp; | |
e114e473 | 289 | |
e05b6f98 RK |
290 | for (cp = string; ; cp++) |
291 | switch (*cp) { | |
292 | case '-': | |
293 | break; | |
294 | case 'r': | |
295 | case 'R': | |
296 | perm |= MAY_READ; | |
297 | break; | |
298 | case 'w': | |
299 | case 'W': | |
300 | perm |= MAY_WRITE; | |
301 | break; | |
302 | case 'x': | |
303 | case 'X': | |
304 | perm |= MAY_EXEC; | |
305 | break; | |
306 | case 'a': | |
307 | case 'A': | |
308 | perm |= MAY_APPEND; | |
309 | break; | |
310 | case 't': | |
311 | case 'T': | |
312 | perm |= MAY_TRANSMUTE; | |
313 | break; | |
c0ab6e56 CS |
314 | case 'l': |
315 | case 'L': | |
316 | perm |= MAY_LOCK; | |
317 | break; | |
d166c802 CS |
318 | case 'b': |
319 | case 'B': | |
320 | perm |= MAY_BRINGUP; | |
321 | break; | |
e05b6f98 RK |
322 | default: |
323 | return perm; | |
324 | } | |
e114e473 CS |
325 | } |
326 | ||
327 | /** | |
f7112e6c CS |
328 | * smk_fill_rule - Fill Smack rule from strings |
329 | * @subject: subject label string | |
330 | * @object: object label string | |
e05b6f98 RK |
331 | * @access1: access string |
332 | * @access2: string with permissions to be removed | |
0e94ae17 JS |
333 | * @rule: Smack rule |
334 | * @import: if non-zero, import labels | |
3518721a | 335 | * @len: label length limit |
f7112e6c | 336 | * |
e774ad68 | 337 | * Returns 0 on success, appropriate error code on failure. |
e114e473 | 338 | */ |
f7112e6c | 339 | static int smk_fill_rule(const char *subject, const char *object, |
e05b6f98 RK |
340 | const char *access1, const char *access2, |
341 | struct smack_parsed_rule *rule, int import, | |
342 | int len) | |
e114e473 | 343 | { |
f7112e6c | 344 | const char *cp; |
0e94ae17 | 345 | struct smack_known *skp; |
e114e473 | 346 | |
0e94ae17 | 347 | if (import) { |
2f823ff8 | 348 | rule->smk_subject = smk_import_entry(subject, len); |
e774ad68 LP |
349 | if (IS_ERR(rule->smk_subject)) |
350 | return PTR_ERR(rule->smk_subject); | |
0e94ae17 | 351 | |
21c7eae2 | 352 | rule->smk_object = smk_import_entry(object, len); |
e774ad68 LP |
353 | if (IS_ERR(rule->smk_object)) |
354 | return PTR_ERR(rule->smk_object); | |
0e94ae17 | 355 | } else { |
3518721a | 356 | cp = smk_parse_smack(subject, len); |
e774ad68 LP |
357 | if (IS_ERR(cp)) |
358 | return PTR_ERR(cp); | |
f7112e6c CS |
359 | skp = smk_find_entry(cp); |
360 | kfree(cp); | |
0e94ae17 | 361 | if (skp == NULL) |
398ce073 | 362 | return -ENOENT; |
2f823ff8 | 363 | rule->smk_subject = skp; |
0e94ae17 | 364 | |
3518721a | 365 | cp = smk_parse_smack(object, len); |
e774ad68 LP |
366 | if (IS_ERR(cp)) |
367 | return PTR_ERR(cp); | |
f7112e6c CS |
368 | skp = smk_find_entry(cp); |
369 | kfree(cp); | |
0e94ae17 | 370 | if (skp == NULL) |
398ce073 | 371 | return -ENOENT; |
21c7eae2 | 372 | rule->smk_object = skp; |
0e94ae17 | 373 | } |
7198e2ee | 374 | |
e05b6f98 RK |
375 | rule->smk_access1 = smk_perm_from_str(access1); |
376 | if (access2) | |
377 | rule->smk_access2 = smk_perm_from_str(access2); | |
378 | else | |
379 | rule->smk_access2 = ~rule->smk_access1; | |
e114e473 | 380 | |
3518721a | 381 | return 0; |
f7112e6c | 382 | } |
e114e473 | 383 | |
f7112e6c CS |
384 | /** |
385 | * smk_parse_rule - parse Smack rule from load string | |
386 | * @data: string to be parsed whose size is SMK_LOADLEN | |
387 | * @rule: Smack rule | |
388 | * @import: if non-zero, import labels | |
389 | * | |
390 | * Returns 0 on success, -1 on errors. | |
391 | */ | |
e05b6f98 RK |
392 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
393 | int import) | |
f7112e6c CS |
394 | { |
395 | int rc; | |
e114e473 | 396 | |
f7112e6c | 397 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
e05b6f98 RK |
398 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
399 | import, SMK_LABELLEN); | |
f7112e6c CS |
400 | return rc; |
401 | } | |
e114e473 | 402 | |
f7112e6c CS |
403 | /** |
404 | * smk_parse_long_rule - parse Smack rule from rule string | |
405 | * @data: string to be parsed, null terminated | |
e05b6f98 | 406 | * @rule: Will be filled with Smack parsed rule |
f7112e6c | 407 | * @import: if non-zero, import labels |
10289b0f | 408 | * @tokens: numer of substrings expected in data |
f7112e6c | 409 | * |
e774ad68 | 410 | * Returns number of processed bytes on success, -ERRNO on failure. |
f7112e6c | 411 | */ |
10289b0f RK |
412 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
413 | int import, int tokens) | |
f7112e6c | 414 | { |
10289b0f RK |
415 | ssize_t cnt = 0; |
416 | char *tok[4]; | |
398ce073 | 417 | int rc; |
10289b0f RK |
418 | int i; |
419 | ||
420 | /* | |
421 | * Parsing the rule in-place, filling all white-spaces with '\0' | |
422 | */ | |
423 | for (i = 0; i < tokens; ++i) { | |
424 | while (isspace(data[cnt])) | |
425 | data[cnt++] = '\0'; | |
426 | ||
427 | if (data[cnt] == '\0') | |
428 | /* Unexpected end of data */ | |
e774ad68 | 429 | return -EINVAL; |
10289b0f RK |
430 | |
431 | tok[i] = data + cnt; | |
432 | ||
433 | while (data[cnt] && !isspace(data[cnt])) | |
434 | ++cnt; | |
e05b6f98 | 435 | } |
10289b0f RK |
436 | while (isspace(data[cnt])) |
437 | data[cnt++] = '\0'; | |
f7112e6c | 438 | |
10289b0f RK |
439 | while (i < 4) |
440 | tok[i++] = NULL; | |
441 | ||
398ce073 JS |
442 | rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
443 | return rc == 0 ? cnt : rc; | |
828716c2 JS |
444 | } |
445 | ||
f7112e6c CS |
446 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
447 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
e05b6f98 | 448 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
828716c2 | 449 | /** |
f7112e6c | 450 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
451 | * @file: file pointer, not actually used |
452 | * @buf: where to get the data from | |
453 | * @count: bytes sent | |
454 | * @ppos: where to start - must be 0 | |
455 | * @rule_list: the list of rules to write to | |
456 | * @rule_lock: lock for the rule list | |
e05b6f98 | 457 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 JS |
458 | * |
459 | * Get one smack access rule from above. | |
f7112e6c CS |
460 | * The format for SMK_LONG_FMT is: |
461 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
462 | * The format for SMK_FIXED24_FMT is exactly: | |
463 | * "subject object rwxat" | |
e05b6f98 RK |
464 | * The format for SMK_CHANGE_FMT is: |
465 | * "subject<whitespace>object<whitespace> | |
466 | * acc_enable<whitespace>acc_disable[<whitespace>...]" | |
828716c2 | 467 | */ |
f7112e6c CS |
468 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
469 | size_t count, loff_t *ppos, | |
470 | struct list_head *rule_list, | |
471 | struct mutex *rule_lock, int format) | |
828716c2 | 472 | { |
470043ba | 473 | struct smack_parsed_rule rule; |
828716c2 | 474 | char *data; |
10289b0f RK |
475 | int rc; |
476 | int trunc = 0; | |
477 | int tokens; | |
478 | ssize_t cnt = 0; | |
828716c2 JS |
479 | |
480 | /* | |
481 | * No partial writes. | |
482 | * Enough data must be present. | |
483 | */ | |
484 | if (*ppos != 0) | |
485 | return -EINVAL; | |
828716c2 | 486 | |
f7112e6c CS |
487 | if (format == SMK_FIXED24_FMT) { |
488 | /* | |
489 | * Minor hack for backward compatibility | |
490 | */ | |
c0ab6e56 | 491 | if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
f7112e6c | 492 | return -EINVAL; |
10289b0f RK |
493 | } else { |
494 | if (count >= PAGE_SIZE) { | |
495 | count = PAGE_SIZE - 1; | |
496 | trunc = 1; | |
497 | } | |
498 | } | |
f7112e6c | 499 | |
16e5c1fc AV |
500 | data = memdup_user_nul(buf, count); |
501 | if (IS_ERR(data)) | |
502 | return PTR_ERR(data); | |
828716c2 | 503 | |
10289b0f RK |
504 | /* |
505 | * In case of parsing only part of user buf, | |
506 | * avoid having partial rule at the data buffer | |
507 | */ | |
508 | if (trunc) { | |
509 | while (count > 0 && (data[count - 1] != '\n')) | |
510 | --count; | |
511 | if (count == 0) { | |
512 | rc = -EINVAL; | |
470043ba | 513 | goto out; |
10289b0f | 514 | } |
f7112e6c CS |
515 | } |
516 | ||
10289b0f RK |
517 | data[count] = '\0'; |
518 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); | |
519 | while (cnt < count) { | |
520 | if (format == SMK_FIXED24_FMT) { | |
521 | rc = smk_parse_rule(data, &rule, 1); | |
e774ad68 | 522 | if (rc < 0) |
10289b0f | 523 | goto out; |
10289b0f RK |
524 | cnt = count; |
525 | } else { | |
526 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); | |
e774ad68 LP |
527 | if (rc < 0) |
528 | goto out; | |
529 | if (rc == 0) { | |
10289b0f RK |
530 | rc = -EINVAL; |
531 | goto out; | |
532 | } | |
533 | cnt += rc; | |
534 | } | |
535 | ||
536 | if (rule_list == NULL) | |
537 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, | |
538 | &rule.smk_subject->smk_rules_lock, 1); | |
539 | else | |
540 | rc = smk_set_access(&rule, rule_list, rule_lock, 0); | |
541 | ||
542 | if (rc) | |
543 | goto out; | |
272cd7a8 CS |
544 | } |
545 | ||
10289b0f | 546 | rc = cnt; |
e114e473 CS |
547 | out: |
548 | kfree(data); | |
549 | return rc; | |
550 | } | |
551 | ||
7898e1f8 | 552 | /* |
40809565 | 553 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
554 | */ |
555 | ||
40809565 CS |
556 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
557 | struct list_head *head) | |
7898e1f8 | 558 | { |
272cd7a8 | 559 | struct list_head *list; |
01fa8474 RK |
560 | int i = *pos; |
561 | ||
562 | rcu_read_lock(); | |
563 | for (list = rcu_dereference(list_next_rcu(head)); | |
564 | list != head; | |
565 | list = rcu_dereference(list_next_rcu(list))) { | |
566 | if (i-- == 0) | |
567 | return list; | |
568 | } | |
272cd7a8 | 569 | |
01fa8474 | 570 | return NULL; |
7898e1f8 CS |
571 | } |
572 | ||
40809565 CS |
573 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
574 | struct list_head *head) | |
7898e1f8 CS |
575 | { |
576 | struct list_head *list = v; | |
577 | ||
01fa8474 RK |
578 | ++*pos; |
579 | list = rcu_dereference(list_next_rcu(list)); | |
580 | ||
581 | return (list == head) ? NULL : list; | |
7898e1f8 CS |
582 | } |
583 | ||
40809565 CS |
584 | static void smk_seq_stop(struct seq_file *s, void *v) |
585 | { | |
01fa8474 | 586 | rcu_read_unlock(); |
40809565 CS |
587 | } |
588 | ||
f7112e6c | 589 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 590 | { |
f7112e6c CS |
591 | /* |
592 | * Don't show any rules with label names too long for | |
593 | * interface file (/smack/load or /smack/load2) | |
594 | * because you should expect to be able to write | |
595 | * anything you read back. | |
596 | */ | |
2f823ff8 | 597 | if (strlen(srp->smk_subject->smk_known) >= max || |
21c7eae2 | 598 | strlen(srp->smk_object->smk_known) >= max) |
f7112e6c | 599 | return; |
7898e1f8 | 600 | |
65ee7f45 RK |
601 | if (srp->smk_access == 0) |
602 | return; | |
603 | ||
21c7eae2 LP |
604 | seq_printf(s, "%s %s", |
605 | srp->smk_subject->smk_known, | |
606 | srp->smk_object->smk_known); | |
7898e1f8 CS |
607 | |
608 | seq_putc(s, ' '); | |
609 | ||
610 | if (srp->smk_access & MAY_READ) | |
611 | seq_putc(s, 'r'); | |
612 | if (srp->smk_access & MAY_WRITE) | |
613 | seq_putc(s, 'w'); | |
614 | if (srp->smk_access & MAY_EXEC) | |
615 | seq_putc(s, 'x'); | |
616 | if (srp->smk_access & MAY_APPEND) | |
617 | seq_putc(s, 'a'); | |
618 | if (srp->smk_access & MAY_TRANSMUTE) | |
619 | seq_putc(s, 't'); | |
c0ab6e56 CS |
620 | if (srp->smk_access & MAY_LOCK) |
621 | seq_putc(s, 'l'); | |
d166c802 CS |
622 | if (srp->smk_access & MAY_BRINGUP) |
623 | seq_putc(s, 'b'); | |
7898e1f8 CS |
624 | |
625 | seq_putc(s, '\n'); | |
f7112e6c CS |
626 | } |
627 | ||
628 | /* | |
629 | * Seq_file read operations for /smack/load | |
630 | */ | |
631 | ||
632 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
633 | { | |
634 | return smk_seq_start(s, pos, &smack_rule_list); | |
635 | } | |
636 | ||
637 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
638 | { | |
639 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
640 | } | |
641 | ||
642 | static int load_seq_show(struct seq_file *s, void *v) | |
643 | { | |
644 | struct list_head *list = v; | |
645 | struct smack_master_list *smlp = | |
01fa8474 | 646 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
647 | |
648 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
649 | |
650 | return 0; | |
651 | } | |
652 | ||
7898e1f8 | 653 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
654 | .start = load2_seq_start, |
655 | .next = load2_seq_next, | |
7898e1f8 | 656 | .show = load_seq_show, |
40809565 | 657 | .stop = smk_seq_stop, |
7898e1f8 CS |
658 | }; |
659 | ||
660 | /** | |
661 | * smk_open_load - open() for /smack/load | |
662 | * @inode: inode structure representing file | |
663 | * @file: "load" file pointer | |
664 | * | |
665 | * For reading, use load_seq_* seq_file reading operations. | |
666 | */ | |
667 | static int smk_open_load(struct inode *inode, struct file *file) | |
668 | { | |
669 | return seq_open(file, &load_seq_ops); | |
670 | } | |
671 | ||
672 | /** | |
673 | * smk_write_load - write() for /smack/load | |
674 | * @file: file pointer, not actually used | |
675 | * @buf: where to get the data from | |
676 | * @count: bytes sent | |
677 | * @ppos: where to start - must be 0 | |
678 | * | |
679 | */ | |
680 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
681 | size_t count, loff_t *ppos) | |
682 | { | |
7898e1f8 CS |
683 | /* |
684 | * Must have privilege. | |
685 | * No partial writes. | |
686 | * Enough data must be present. | |
687 | */ | |
1880eff7 | 688 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
689 | return -EPERM; |
690 | ||
f7112e6c CS |
691 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
692 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
693 | } |
694 | ||
e114e473 CS |
695 | static const struct file_operations smk_load_ops = { |
696 | .open = smk_open_load, | |
697 | .read = seq_read, | |
698 | .llseek = seq_lseek, | |
699 | .write = smk_write_load, | |
cb622bbb | 700 | .release = seq_release, |
e114e473 CS |
701 | }; |
702 | ||
703 | /** | |
704 | * smk_cipso_doi - initialize the CIPSO domain | |
705 | */ | |
30aa4faf | 706 | static void smk_cipso_doi(void) |
e114e473 CS |
707 | { |
708 | int rc; | |
709 | struct cipso_v4_doi *doip; | |
6d3dc07c | 710 | struct netlbl_audit nai; |
e114e473 | 711 | |
6d3dc07c | 712 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 713 | |
6d3dc07c | 714 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
715 | if (rc != 0) |
716 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
717 | __func__, __LINE__, rc); | |
718 | ||
719 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
720 | if (doip == NULL) | |
721 | panic("smack: Failed to initialize cipso DOI.\n"); | |
722 | doip->map.std = NULL; | |
723 | doip->doi = smk_cipso_doi_value; | |
724 | doip->type = CIPSO_V4_MAP_PASS; | |
725 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
726 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
727 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
728 | ||
6d3dc07c | 729 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 730 | if (rc != 0) { |
6c2e8ac0 PM |
731 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
732 | __func__, __LINE__, rc); | |
733 | kfree(doip); | |
734 | return; | |
735 | } | |
6d3dc07c | 736 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
737 | if (rc != 0) { |
738 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 739 | __func__, __LINE__, rc); |
b1edeb10 | 740 | kfree(doip); |
6c2e8ac0 | 741 | return; |
b1edeb10 | 742 | } |
e114e473 CS |
743 | } |
744 | ||
4bc87e62 CS |
745 | /** |
746 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 747 | * @oldambient: previous domain string |
4bc87e62 | 748 | */ |
30aa4faf | 749 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
750 | { |
751 | int rc; | |
6d3dc07c | 752 | struct netlbl_audit nai; |
4bc87e62 | 753 | |
6d3dc07c | 754 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
755 | |
756 | if (oldambient != NULL) { | |
6d3dc07c | 757 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
758 | if (rc != 0) |
759 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
760 | __func__, __LINE__, rc); | |
761 | } | |
f7112e6c | 762 | if (smack_net_ambient == NULL) |
2f823ff8 | 763 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 764 | |
2f823ff8 | 765 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 766 | NULL, NULL, &nai); |
4bc87e62 CS |
767 | if (rc != 0) |
768 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
769 | __func__, __LINE__, rc); | |
770 | } | |
771 | ||
e114e473 CS |
772 | /* |
773 | * Seq_file read operations for /smack/cipso | |
774 | */ | |
775 | ||
776 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
777 | { | |
40809565 | 778 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
779 | } |
780 | ||
781 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
782 | { | |
40809565 | 783 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
784 | } |
785 | ||
786 | /* | |
787 | * Print cipso labels in format: | |
788 | * label level[/cat[,cat]] | |
789 | */ | |
790 | static int cipso_seq_show(struct seq_file *s, void *v) | |
791 | { | |
7198e2ee EB |
792 | struct list_head *list = v; |
793 | struct smack_known *skp = | |
01fa8474 | 794 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 795 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 796 | char sep = '/'; |
e114e473 | 797 | int i; |
e114e473 | 798 | |
f7112e6c CS |
799 | /* |
800 | * Don't show a label that could not have been set using | |
801 | * /smack/cipso. This is in support of the notion that | |
802 | * anything read from /smack/cipso ought to be writeable | |
803 | * to /smack/cipso. | |
804 | * | |
805 | * /smack/cipso2 should be used instead. | |
806 | */ | |
807 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
808 | return 0; |
809 | ||
f7112e6c | 810 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 811 | |
4fbe63d1 PM |
812 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
813 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
814 | seq_printf(s, "%c%d", sep, i); |
815 | sep = ','; | |
816 | } | |
e114e473 CS |
817 | |
818 | seq_putc(s, '\n'); | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
88e9d34c | 823 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 824 | .start = cipso_seq_start, |
e114e473 CS |
825 | .next = cipso_seq_next, |
826 | .show = cipso_seq_show, | |
40809565 | 827 | .stop = smk_seq_stop, |
e114e473 CS |
828 | }; |
829 | ||
830 | /** | |
831 | * smk_open_cipso - open() for /smack/cipso | |
832 | * @inode: inode structure representing file | |
833 | * @file: "cipso" file pointer | |
834 | * | |
835 | * Connect our cipso_seq_* operations with /smack/cipso | |
836 | * file_operations | |
837 | */ | |
838 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
839 | { | |
840 | return seq_open(file, &cipso_seq_ops); | |
841 | } | |
842 | ||
843 | /** | |
f7112e6c | 844 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 845 | * @file: file pointer, not actually used |
e114e473 CS |
846 | * @buf: where to get the data from |
847 | * @count: bytes sent | |
848 | * @ppos: where to start | |
f7112e6c | 849 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
850 | * |
851 | * Accepts only one cipso rule per write call. | |
852 | * Returns number of bytes written or error code, as appropriate | |
853 | */ | |
f7112e6c CS |
854 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
855 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
856 | { |
857 | struct smack_known *skp; | |
f7112e6c CS |
858 | struct netlbl_lsm_secattr ncats; |
859 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 860 | int maplevel; |
f7112e6c | 861 | unsigned int cat; |
e114e473 CS |
862 | int catlen; |
863 | ssize_t rc = -EINVAL; | |
864 | char *data = NULL; | |
865 | char *rule; | |
866 | int ret; | |
867 | int i; | |
868 | ||
869 | /* | |
870 | * Must have privilege. | |
871 | * No partial writes. | |
872 | * Enough data must be present. | |
873 | */ | |
1880eff7 | 874 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
875 | return -EPERM; |
876 | if (*ppos != 0) | |
877 | return -EINVAL; | |
f7112e6c CS |
878 | if (format == SMK_FIXED24_FMT && |
879 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
880 | return -EINVAL; |
881 | ||
16e5c1fc AV |
882 | data = memdup_user_nul(buf, count); |
883 | if (IS_ERR(data)) | |
884 | return PTR_ERR(data); | |
e114e473 | 885 | |
e114e473 CS |
886 | rule = data; |
887 | /* | |
888 | * Only allow one writer at a time. Writes should be | |
889 | * quite rare and small in any case. | |
890 | */ | |
891 | mutex_lock(&smack_cipso_lock); | |
892 | ||
893 | skp = smk_import_entry(rule, 0); | |
e774ad68 LP |
894 | if (IS_ERR(skp)) { |
895 | rc = PTR_ERR(skp); | |
e114e473 | 896 | goto out; |
e774ad68 | 897 | } |
e114e473 | 898 | |
f7112e6c CS |
899 | if (format == SMK_FIXED24_FMT) |
900 | rule += SMK_LABELLEN; | |
901 | else | |
0fcfee61 | 902 | rule += strlen(skp->smk_known) + 1; |
f7112e6c | 903 | |
e114e473 CS |
904 | ret = sscanf(rule, "%d", &maplevel); |
905 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
906 | goto out; | |
907 | ||
908 | rule += SMK_DIGITLEN; | |
909 | ret = sscanf(rule, "%d", &catlen); | |
910 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
911 | goto out; | |
912 | ||
f7112e6c CS |
913 | if (format == SMK_FIXED24_FMT && |
914 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
915 | goto out; |
916 | ||
917 | memset(mapcatset, 0, sizeof(mapcatset)); | |
918 | ||
919 | for (i = 0; i < catlen; i++) { | |
920 | rule += SMK_DIGITLEN; | |
f7112e6c | 921 | ret = sscanf(rule, "%u", &cat); |
677264e8 | 922 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
923 | goto out; |
924 | ||
925 | smack_catset_bit(cat, mapcatset); | |
926 | } | |
927 | ||
f7112e6c CS |
928 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
929 | if (rc >= 0) { | |
4fbe63d1 | 930 | netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat); |
f7112e6c CS |
931 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
932 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
933 | rc = count; | |
e114e473 CS |
934 | } |
935 | ||
e114e473 CS |
936 | out: |
937 | mutex_unlock(&smack_cipso_lock); | |
e114e473 CS |
938 | kfree(data); |
939 | return rc; | |
940 | } | |
941 | ||
f7112e6c CS |
942 | /** |
943 | * smk_write_cipso - write() for /smack/cipso | |
944 | * @file: file pointer, not actually used | |
945 | * @buf: where to get the data from | |
946 | * @count: bytes sent | |
947 | * @ppos: where to start | |
948 | * | |
949 | * Accepts only one cipso rule per write call. | |
950 | * Returns number of bytes written or error code, as appropriate | |
951 | */ | |
952 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
953 | size_t count, loff_t *ppos) | |
954 | { | |
955 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
956 | } | |
957 | ||
e114e473 CS |
958 | static const struct file_operations smk_cipso_ops = { |
959 | .open = smk_open_cipso, | |
960 | .read = seq_read, | |
961 | .llseek = seq_lseek, | |
962 | .write = smk_write_cipso, | |
963 | .release = seq_release, | |
964 | }; | |
965 | ||
f7112e6c CS |
966 | /* |
967 | * Seq_file read operations for /smack/cipso2 | |
968 | */ | |
969 | ||
970 | /* | |
971 | * Print cipso labels in format: | |
972 | * label level[/cat[,cat]] | |
973 | */ | |
974 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
975 | { | |
976 | struct list_head *list = v; | |
977 | struct smack_known *skp = | |
01fa8474 | 978 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 979 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
f7112e6c CS |
980 | char sep = '/'; |
981 | int i; | |
982 | ||
983 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
984 | ||
4fbe63d1 PM |
985 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
986 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
987 | seq_printf(s, "%c%d", sep, i); |
988 | sep = ','; | |
989 | } | |
990 | ||
991 | seq_putc(s, '\n'); | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
996 | static const struct seq_operations cipso2_seq_ops = { | |
997 | .start = cipso_seq_start, | |
998 | .next = cipso_seq_next, | |
999 | .show = cipso2_seq_show, | |
1000 | .stop = smk_seq_stop, | |
1001 | }; | |
1002 | ||
1003 | /** | |
1004 | * smk_open_cipso2 - open() for /smack/cipso2 | |
1005 | * @inode: inode structure representing file | |
1006 | * @file: "cipso2" file pointer | |
1007 | * | |
1008 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
1009 | * file_operations | |
1010 | */ | |
1011 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
1012 | { | |
1013 | return seq_open(file, &cipso2_seq_ops); | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * smk_write_cipso2 - write() for /smack/cipso2 | |
1018 | * @file: file pointer, not actually used | |
1019 | * @buf: where to get the data from | |
1020 | * @count: bytes sent | |
1021 | * @ppos: where to start | |
1022 | * | |
1023 | * Accepts only one cipso rule per write call. | |
1024 | * Returns number of bytes written or error code, as appropriate | |
1025 | */ | |
1026 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1027 | size_t count, loff_t *ppos) | |
1028 | { | |
1029 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1030 | } | |
1031 | ||
1032 | static const struct file_operations smk_cipso2_ops = { | |
1033 | .open = smk_open_cipso2, | |
1034 | .read = seq_read, | |
1035 | .llseek = seq_lseek, | |
1036 | .write = smk_write_cipso2, | |
1037 | .release = seq_release, | |
1038 | }; | |
1039 | ||
6d3dc07c CS |
1040 | /* |
1041 | * Seq_file read operations for /smack/netlabel | |
1042 | */ | |
1043 | ||
21abb1ec | 1044 | static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
6d3dc07c | 1045 | { |
21abb1ec | 1046 | return smk_seq_start(s, pos, &smk_net4addr_list); |
6d3dc07c CS |
1047 | } |
1048 | ||
21abb1ec | 1049 | static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
6d3dc07c | 1050 | { |
21abb1ec | 1051 | return smk_seq_next(s, v, pos, &smk_net4addr_list); |
6d3dc07c | 1052 | } |
6d3dc07c CS |
1053 | |
1054 | /* | |
1055 | * Print host/label pairs | |
1056 | */ | |
21abb1ec | 1057 | static int net4addr_seq_show(struct seq_file *s, void *v) |
6d3dc07c | 1058 | { |
7198e2ee | 1059 | struct list_head *list = v; |
21abb1ec CS |
1060 | struct smk_net4addr *skp = |
1061 | list_entry_rcu(list, struct smk_net4addr, list); | |
1062 | char *kp = SMACK_CIPSO_OPTION; | |
6d3dc07c | 1063 | |
21abb1ec CS |
1064 | if (skp->smk_label != NULL) |
1065 | kp = skp->smk_label->smk_known; | |
1066 | seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr, | |
1067 | skp->smk_masks, kp); | |
6d3dc07c CS |
1068 | |
1069 | return 0; | |
1070 | } | |
1071 | ||
21abb1ec CS |
1072 | static const struct seq_operations net4addr_seq_ops = { |
1073 | .start = net4addr_seq_start, | |
1074 | .next = net4addr_seq_next, | |
1075 | .show = net4addr_seq_show, | |
40809565 | 1076 | .stop = smk_seq_stop, |
6d3dc07c CS |
1077 | }; |
1078 | ||
1079 | /** | |
21abb1ec | 1080 | * smk_open_net4addr - open() for /smack/netlabel |
6d3dc07c CS |
1081 | * @inode: inode structure representing file |
1082 | * @file: "netlabel" file pointer | |
1083 | * | |
21abb1ec | 1084 | * Connect our net4addr_seq_* operations with /smack/netlabel |
6d3dc07c CS |
1085 | * file_operations |
1086 | */ | |
21abb1ec | 1087 | static int smk_open_net4addr(struct inode *inode, struct file *file) |
6d3dc07c | 1088 | { |
21abb1ec | 1089 | return seq_open(file, &net4addr_seq_ops); |
6d3dc07c CS |
1090 | } |
1091 | ||
113a0e45 | 1092 | /** |
21abb1ec | 1093 | * smk_net4addr_insert |
113a0e45 | 1094 | * @new : netlabel to insert |
1095 | * | |
21abb1ec | 1096 | * This helper insert netlabel in the smack_net4addrs list |
113a0e45 | 1097 | * sorted by netmask length (longest to smallest) |
21abb1ec | 1098 | * locked by &smk_net4addr_lock in smk_write_net4addr |
7198e2ee | 1099 | * |
113a0e45 | 1100 | */ |
21abb1ec | 1101 | static void smk_net4addr_insert(struct smk_net4addr *new) |
113a0e45 | 1102 | { |
21abb1ec CS |
1103 | struct smk_net4addr *m; |
1104 | struct smk_net4addr *m_next; | |
113a0e45 | 1105 | |
21abb1ec CS |
1106 | if (list_empty(&smk_net4addr_list)) { |
1107 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1108 | return; |
1109 | } | |
1110 | ||
21abb1ec CS |
1111 | m = list_entry_rcu(smk_net4addr_list.next, |
1112 | struct smk_net4addr, list); | |
7198e2ee | 1113 | |
113a0e45 | 1114 | /* the comparison '>' is a bit hacky, but works */ |
21abb1ec CS |
1115 | if (new->smk_masks > m->smk_masks) { |
1116 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1117 | return; |
1118 | } | |
7198e2ee | 1119 | |
21abb1ec CS |
1120 | list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
1121 | if (list_is_last(&m->list, &smk_net4addr_list)) { | |
7198e2ee | 1122 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1123 | return; |
1124 | } | |
05725f7e | 1125 | m_next = list_entry_rcu(m->list.next, |
21abb1ec CS |
1126 | struct smk_net4addr, list); |
1127 | if (new->smk_masks > m_next->smk_masks) { | |
7198e2ee | 1128 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1129 | return; |
1130 | } | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | ||
6d3dc07c | 1135 | /** |
21abb1ec | 1136 | * smk_write_net4addr - write() for /smack/netlabel |
251a2a95 | 1137 | * @file: file pointer, not actually used |
6d3dc07c CS |
1138 | * @buf: where to get the data from |
1139 | * @count: bytes sent | |
1140 | * @ppos: where to start | |
1141 | * | |
21abb1ec | 1142 | * Accepts only one net4addr per write call. |
6d3dc07c CS |
1143 | * Returns number of bytes written or error code, as appropriate |
1144 | */ | |
21abb1ec | 1145 | static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
6d3dc07c CS |
1146 | size_t count, loff_t *ppos) |
1147 | { | |
21abb1ec | 1148 | struct smk_net4addr *snp; |
6d3dc07c | 1149 | struct sockaddr_in newname; |
f7112e6c | 1150 | char *smack; |
21abb1ec | 1151 | struct smack_known *skp = NULL; |
f7112e6c | 1152 | char *data; |
6d3dc07c CS |
1153 | char *host = (char *)&newname.sin_addr.s_addr; |
1154 | int rc; | |
1155 | struct netlbl_audit audit_info; | |
1156 | struct in_addr mask; | |
1157 | unsigned int m; | |
21abb1ec | 1158 | unsigned int masks; |
7198e2ee | 1159 | int found; |
113a0e45 | 1160 | u32 mask_bits = (1<<31); |
6d3dc07c | 1161 | __be32 nsa; |
113a0e45 | 1162 | u32 temp_mask; |
6d3dc07c CS |
1163 | |
1164 | /* | |
1165 | * Must have privilege. | |
1166 | * No partial writes. | |
1167 | * Enough data must be present. | |
1168 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1169 | * "<addr, as a.b.c.d><space><label>" | |
1170 | */ | |
1880eff7 | 1171 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1172 | return -EPERM; |
1173 | if (*ppos != 0) | |
1174 | return -EINVAL; | |
f7112e6c | 1175 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1176 | return -EINVAL; |
f7112e6c | 1177 | |
16e5c1fc AV |
1178 | data = memdup_user_nul(buf, count); |
1179 | if (IS_ERR(data)) | |
1180 | return PTR_ERR(data); | |
f7112e6c CS |
1181 | |
1182 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1183 | if (smack == NULL) { | |
1184 | rc = -ENOMEM; | |
1185 | goto free_data_out; | |
1186 | } | |
6d3dc07c | 1187 | |
ec554fa7 | 1188 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
21abb1ec | 1189 | &host[0], &host[1], &host[2], &host[3], &masks, smack); |
6d3dc07c CS |
1190 | if (rc != 6) { |
1191 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1192 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1193 | if (rc != 5) { |
1194 | rc = -EINVAL; | |
1195 | goto free_out; | |
1196 | } | |
6d3dc07c | 1197 | m = BEBITS; |
21abb1ec | 1198 | masks = 32; |
6d3dc07c | 1199 | } |
21abb1ec | 1200 | if (masks > BEBITS) { |
f7112e6c CS |
1201 | rc = -EINVAL; |
1202 | goto free_out; | |
1203 | } | |
6d3dc07c | 1204 | |
f7112e6c CS |
1205 | /* |
1206 | * If smack begins with '-', it is an option, don't import it | |
1207 | */ | |
4303154e | 1208 | if (smack[0] != '-') { |
21c7eae2 | 1209 | skp = smk_import_entry(smack, 0); |
e774ad68 LP |
1210 | if (IS_ERR(skp)) { |
1211 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1212 | goto free_out; |
1213 | } | |
4303154e | 1214 | } else { |
21abb1ec CS |
1215 | /* |
1216 | * Only the -CIPSO option is supported for IPv4 | |
1217 | */ | |
1218 | if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { | |
f7112e6c CS |
1219 | rc = -EINVAL; |
1220 | goto free_out; | |
1221 | } | |
4303154e | 1222 | } |
6d3dc07c | 1223 | |
21abb1ec | 1224 | for (m = masks, temp_mask = 0; m > 0; m--) { |
113a0e45 | 1225 | temp_mask |= mask_bits; |
1226 | mask_bits >>= 1; | |
6d3dc07c | 1227 | } |
113a0e45 | 1228 | mask.s_addr = cpu_to_be32(temp_mask); |
1229 | ||
1230 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1231 | /* |
1232 | * Only allow one writer at a time. Writes should be | |
1233 | * quite rare and small in any case. | |
1234 | */ | |
21abb1ec | 1235 | mutex_lock(&smk_net4addr_lock); |
6d3dc07c CS |
1236 | |
1237 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1238 | /* try to find if the prefix is already in the list */ |
7198e2ee | 1239 | found = 0; |
21abb1ec CS |
1240 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
1241 | if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { | |
7198e2ee | 1242 | found = 1; |
6d3dc07c | 1243 | break; |
7198e2ee EB |
1244 | } |
1245 | } | |
6d3dc07c CS |
1246 | smk_netlabel_audit_set(&audit_info); |
1247 | ||
7198e2ee | 1248 | if (found == 0) { |
21c7eae2 LP |
1249 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
1250 | if (snp == NULL) | |
6d3dc07c CS |
1251 | rc = -ENOMEM; |
1252 | else { | |
1253 | rc = 0; | |
21abb1ec | 1254 | snp->smk_host.s_addr = newname.sin_addr.s_addr; |
21c7eae2 LP |
1255 | snp->smk_mask.s_addr = mask.s_addr; |
1256 | snp->smk_label = skp; | |
21abb1ec CS |
1257 | snp->smk_masks = masks; |
1258 | smk_net4addr_insert(snp); | |
6d3dc07c CS |
1259 | } |
1260 | } else { | |
21abb1ec CS |
1261 | /* |
1262 | * Delete the unlabeled entry, only if the previous label | |
1263 | * wasn't the special CIPSO option | |
1264 | */ | |
1265 | if (snp->smk_label != NULL) | |
4303154e | 1266 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
21abb1ec | 1267 | &snp->smk_host, &snp->smk_mask, |
4303154e EB |
1268 | PF_INET, &audit_info); |
1269 | else | |
1270 | rc = 0; | |
21c7eae2 | 1271 | snp->smk_label = skp; |
6d3dc07c CS |
1272 | } |
1273 | ||
1274 | /* | |
1275 | * Now tell netlabel about the single label nature of | |
1276 | * this host so that incoming packets get labeled. | |
4303154e | 1277 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1278 | */ |
21abb1ec | 1279 | if (rc == 0 && skp != NULL) |
6d3dc07c | 1280 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
21abb1ec | 1281 | &snp->smk_host, &snp->smk_mask, PF_INET, |
21c7eae2 | 1282 | snp->smk_label->smk_secid, &audit_info); |
6d3dc07c CS |
1283 | |
1284 | if (rc == 0) | |
1285 | rc = count; | |
1286 | ||
21abb1ec CS |
1287 | mutex_unlock(&smk_net4addr_lock); |
1288 | ||
1289 | free_out: | |
1290 | kfree(smack); | |
1291 | free_data_out: | |
1292 | kfree(data); | |
1293 | ||
1294 | return rc; | |
1295 | } | |
1296 | ||
1297 | static const struct file_operations smk_net4addr_ops = { | |
1298 | .open = smk_open_net4addr, | |
1299 | .read = seq_read, | |
1300 | .llseek = seq_lseek, | |
1301 | .write = smk_write_net4addr, | |
1302 | .release = seq_release, | |
1303 | }; | |
1304 | ||
1305 | #if IS_ENABLED(CONFIG_IPV6) | |
1306 | /* | |
1307 | * Seq_file read operations for /smack/netlabel6 | |
1308 | */ | |
1309 | ||
1310 | static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) | |
1311 | { | |
1312 | return smk_seq_start(s, pos, &smk_net6addr_list); | |
1313 | } | |
1314 | ||
1315 | static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1316 | { | |
1317 | return smk_seq_next(s, v, pos, &smk_net6addr_list); | |
1318 | } | |
1319 | ||
1320 | /* | |
1321 | * Print host/label pairs | |
1322 | */ | |
1323 | static int net6addr_seq_show(struct seq_file *s, void *v) | |
1324 | { | |
1325 | struct list_head *list = v; | |
1326 | struct smk_net6addr *skp = | |
1327 | list_entry(list, struct smk_net6addr, list); | |
1328 | ||
1329 | if (skp->smk_label != NULL) | |
1330 | seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks, | |
1331 | skp->smk_label->smk_known); | |
1332 | ||
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | static const struct seq_operations net6addr_seq_ops = { | |
1337 | .start = net6addr_seq_start, | |
1338 | .next = net6addr_seq_next, | |
1339 | .show = net6addr_seq_show, | |
1340 | .stop = smk_seq_stop, | |
1341 | }; | |
1342 | ||
1343 | /** | |
1344 | * smk_open_net6addr - open() for /smack/netlabel | |
1345 | * @inode: inode structure representing file | |
1346 | * @file: "netlabel" file pointer | |
1347 | * | |
1348 | * Connect our net6addr_seq_* operations with /smack/netlabel | |
1349 | * file_operations | |
1350 | */ | |
1351 | static int smk_open_net6addr(struct inode *inode, struct file *file) | |
1352 | { | |
1353 | return seq_open(file, &net6addr_seq_ops); | |
1354 | } | |
1355 | ||
1356 | /** | |
1357 | * smk_net6addr_insert | |
1358 | * @new : entry to insert | |
1359 | * | |
1360 | * This inserts an entry in the smack_net6addrs list | |
1361 | * sorted by netmask length (longest to smallest) | |
1362 | * locked by &smk_net6addr_lock in smk_write_net6addr | |
1363 | * | |
1364 | */ | |
1365 | static void smk_net6addr_insert(struct smk_net6addr *new) | |
1366 | { | |
1367 | struct smk_net6addr *m_next; | |
1368 | struct smk_net6addr *m; | |
1369 | ||
1370 | if (list_empty(&smk_net6addr_list)) { | |
1371 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1372 | return; | |
1373 | } | |
1374 | ||
1375 | m = list_entry_rcu(smk_net6addr_list.next, | |
1376 | struct smk_net6addr, list); | |
1377 | ||
1378 | if (new->smk_masks > m->smk_masks) { | |
1379 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1380 | return; | |
1381 | } | |
1382 | ||
1383 | list_for_each_entry_rcu(m, &smk_net6addr_list, list) { | |
1384 | if (list_is_last(&m->list, &smk_net6addr_list)) { | |
1385 | list_add_rcu(&new->list, &m->list); | |
1386 | return; | |
1387 | } | |
1388 | m_next = list_entry_rcu(m->list.next, | |
1389 | struct smk_net6addr, list); | |
1390 | if (new->smk_masks > m_next->smk_masks) { | |
1391 | list_add_rcu(&new->list, &m->list); | |
1392 | return; | |
1393 | } | |
1394 | } | |
1395 | } | |
1396 | ||
1397 | ||
1398 | /** | |
1399 | * smk_write_net6addr - write() for /smack/netlabel | |
1400 | * @file: file pointer, not actually used | |
1401 | * @buf: where to get the data from | |
1402 | * @count: bytes sent | |
1403 | * @ppos: where to start | |
1404 | * | |
1405 | * Accepts only one net6addr per write call. | |
1406 | * Returns number of bytes written or error code, as appropriate | |
1407 | */ | |
1408 | static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, | |
1409 | size_t count, loff_t *ppos) | |
1410 | { | |
1411 | struct smk_net6addr *snp; | |
1412 | struct in6_addr newname; | |
1413 | struct in6_addr fullmask; | |
1414 | struct smack_known *skp = NULL; | |
1415 | char *smack; | |
1416 | char *data; | |
1417 | int rc = 0; | |
1418 | int found = 0; | |
1419 | int i; | |
1420 | unsigned int scanned[8]; | |
1421 | unsigned int m; | |
1422 | unsigned int mask = 128; | |
1423 | ||
1424 | /* | |
1425 | * Must have privilege. | |
1426 | * No partial writes. | |
1427 | * Enough data must be present. | |
1428 | * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" | |
1429 | * "<addr, as a:b:c:d:e:f:g:h><space><label>" | |
1430 | */ | |
1431 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
1432 | return -EPERM; | |
1433 | if (*ppos != 0) | |
1434 | return -EINVAL; | |
1435 | if (count < SMK_NETLBLADDRMIN) | |
1436 | return -EINVAL; | |
1437 | ||
16e5c1fc AV |
1438 | data = memdup_user_nul(buf, count); |
1439 | if (IS_ERR(data)) | |
1440 | return PTR_ERR(data); | |
21abb1ec CS |
1441 | |
1442 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1443 | if (smack == NULL) { | |
1444 | rc = -ENOMEM; | |
1445 | goto free_data_out; | |
1446 | } | |
1447 | ||
21abb1ec CS |
1448 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s", |
1449 | &scanned[0], &scanned[1], &scanned[2], &scanned[3], | |
1450 | &scanned[4], &scanned[5], &scanned[6], &scanned[7], | |
1451 | &mask, smack); | |
1452 | if (i != 10) { | |
1453 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s", | |
1454 | &scanned[0], &scanned[1], &scanned[2], | |
1455 | &scanned[3], &scanned[4], &scanned[5], | |
1456 | &scanned[6], &scanned[7], smack); | |
1457 | if (i != 9) { | |
1458 | rc = -EINVAL; | |
1459 | goto free_out; | |
1460 | } | |
1461 | } | |
1462 | if (mask > 128) { | |
1463 | rc = -EINVAL; | |
1464 | goto free_out; | |
1465 | } | |
1466 | for (i = 0; i < 8; i++) { | |
1467 | if (scanned[i] > 0xffff) { | |
1468 | rc = -EINVAL; | |
1469 | goto free_out; | |
1470 | } | |
1471 | newname.s6_addr16[i] = htons(scanned[i]); | |
1472 | } | |
1473 | ||
1474 | /* | |
1475 | * If smack begins with '-', it is an option, don't import it | |
1476 | */ | |
1477 | if (smack[0] != '-') { | |
1478 | skp = smk_import_entry(smack, 0); | |
5f2bfe2f LP |
1479 | if (IS_ERR(skp)) { |
1480 | rc = PTR_ERR(skp); | |
21abb1ec CS |
1481 | goto free_out; |
1482 | } | |
1483 | } else { | |
1484 | /* | |
1485 | * Only -DELETE is supported for IPv6 | |
1486 | */ | |
1487 | if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { | |
1488 | rc = -EINVAL; | |
1489 | goto free_out; | |
1490 | } | |
1491 | } | |
1492 | ||
1493 | for (i = 0, m = mask; i < 8; i++) { | |
1494 | if (m >= 16) { | |
1495 | fullmask.s6_addr16[i] = 0xffff; | |
1496 | m -= 16; | |
1497 | } else if (m > 0) { | |
1498 | fullmask.s6_addr16[i] = (1 << m) - 1; | |
1499 | m = 0; | |
1500 | } else | |
1501 | fullmask.s6_addr16[i] = 0; | |
1502 | newname.s6_addr16[i] &= fullmask.s6_addr16[i]; | |
1503 | } | |
1504 | ||
1505 | /* | |
1506 | * Only allow one writer at a time. Writes should be | |
1507 | * quite rare and small in any case. | |
1508 | */ | |
1509 | mutex_lock(&smk_net6addr_lock); | |
1510 | /* | |
1511 | * Try to find the prefix in the list | |
1512 | */ | |
1513 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
1514 | if (mask != snp->smk_masks) | |
1515 | continue; | |
1516 | for (found = 1, i = 0; i < 8; i++) { | |
1517 | if (newname.s6_addr16[i] != | |
1518 | snp->smk_host.s6_addr16[i]) { | |
1519 | found = 0; | |
1520 | break; | |
1521 | } | |
1522 | } | |
1523 | if (found == 1) | |
1524 | break; | |
1525 | } | |
1526 | if (found == 0) { | |
1527 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); | |
1528 | if (snp == NULL) | |
1529 | rc = -ENOMEM; | |
1530 | else { | |
1531 | snp->smk_host = newname; | |
1532 | snp->smk_mask = fullmask; | |
1533 | snp->smk_masks = mask; | |
1534 | snp->smk_label = skp; | |
1535 | smk_net6addr_insert(snp); | |
1536 | } | |
1537 | } else { | |
1538 | snp->smk_label = skp; | |
1539 | } | |
1540 | ||
1541 | if (rc == 0) | |
1542 | rc = count; | |
1543 | ||
1544 | mutex_unlock(&smk_net6addr_lock); | |
6d3dc07c | 1545 | |
f7112e6c CS |
1546 | free_out: |
1547 | kfree(smack); | |
1548 | free_data_out: | |
1549 | kfree(data); | |
1550 | ||
6d3dc07c CS |
1551 | return rc; |
1552 | } | |
1553 | ||
21abb1ec CS |
1554 | static const struct file_operations smk_net6addr_ops = { |
1555 | .open = smk_open_net6addr, | |
6d3dc07c CS |
1556 | .read = seq_read, |
1557 | .llseek = seq_lseek, | |
21abb1ec | 1558 | .write = smk_write_net6addr, |
6d3dc07c CS |
1559 | .release = seq_release, |
1560 | }; | |
21abb1ec | 1561 | #endif /* CONFIG_IPV6 */ |
6d3dc07c | 1562 | |
e114e473 CS |
1563 | /** |
1564 | * smk_read_doi - read() for /smack/doi | |
1565 | * @filp: file pointer, not actually used | |
1566 | * @buf: where to put the result | |
1567 | * @count: maximum to send along | |
1568 | * @ppos: where to start | |
1569 | * | |
1570 | * Returns number of bytes read or error code, as appropriate | |
1571 | */ | |
1572 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1573 | size_t count, loff_t *ppos) | |
1574 | { | |
1575 | char temp[80]; | |
1576 | ssize_t rc; | |
1577 | ||
1578 | if (*ppos != 0) | |
1579 | return 0; | |
1580 | ||
1581 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1582 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1583 | ||
1584 | return rc; | |
1585 | } | |
1586 | ||
1587 | /** | |
1588 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1589 | * @file: file pointer, not actually used |
e114e473 CS |
1590 | * @buf: where to get the data from |
1591 | * @count: bytes sent | |
1592 | * @ppos: where to start | |
1593 | * | |
1594 | * Returns number of bytes written or error code, as appropriate | |
1595 | */ | |
1596 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1597 | size_t count, loff_t *ppos) | |
1598 | { | |
1599 | char temp[80]; | |
1600 | int i; | |
1601 | ||
1880eff7 | 1602 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1603 | return -EPERM; |
1604 | ||
1605 | if (count >= sizeof(temp) || count == 0) | |
1606 | return -EINVAL; | |
1607 | ||
1608 | if (copy_from_user(temp, buf, count) != 0) | |
1609 | return -EFAULT; | |
1610 | ||
1611 | temp[count] = '\0'; | |
1612 | ||
1613 | if (sscanf(temp, "%d", &i) != 1) | |
1614 | return -EINVAL; | |
1615 | ||
1616 | smk_cipso_doi_value = i; | |
1617 | ||
1618 | smk_cipso_doi(); | |
1619 | ||
1620 | return count; | |
1621 | } | |
1622 | ||
1623 | static const struct file_operations smk_doi_ops = { | |
1624 | .read = smk_read_doi, | |
1625 | .write = smk_write_doi, | |
6038f373 | 1626 | .llseek = default_llseek, |
e114e473 CS |
1627 | }; |
1628 | ||
1629 | /** | |
1630 | * smk_read_direct - read() for /smack/direct | |
1631 | * @filp: file pointer, not actually used | |
1632 | * @buf: where to put the result | |
1633 | * @count: maximum to send along | |
1634 | * @ppos: where to start | |
1635 | * | |
1636 | * Returns number of bytes read or error code, as appropriate | |
1637 | */ | |
1638 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1639 | size_t count, loff_t *ppos) | |
1640 | { | |
1641 | char temp[80]; | |
1642 | ssize_t rc; | |
1643 | ||
1644 | if (*ppos != 0) | |
1645 | return 0; | |
1646 | ||
1647 | sprintf(temp, "%d", smack_cipso_direct); | |
1648 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1649 | ||
1650 | return rc; | |
1651 | } | |
1652 | ||
1653 | /** | |
1654 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1655 | * @file: file pointer, not actually used |
e114e473 CS |
1656 | * @buf: where to get the data from |
1657 | * @count: bytes sent | |
1658 | * @ppos: where to start | |
1659 | * | |
1660 | * Returns number of bytes written or error code, as appropriate | |
1661 | */ | |
1662 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1663 | size_t count, loff_t *ppos) | |
1664 | { | |
f7112e6c | 1665 | struct smack_known *skp; |
e114e473 CS |
1666 | char temp[80]; |
1667 | int i; | |
1668 | ||
1880eff7 | 1669 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1670 | return -EPERM; |
1671 | ||
1672 | if (count >= sizeof(temp) || count == 0) | |
1673 | return -EINVAL; | |
1674 | ||
1675 | if (copy_from_user(temp, buf, count) != 0) | |
1676 | return -EFAULT; | |
1677 | ||
1678 | temp[count] = '\0'; | |
1679 | ||
1680 | if (sscanf(temp, "%d", &i) != 1) | |
1681 | return -EINVAL; | |
1682 | ||
f7112e6c CS |
1683 | /* |
1684 | * Don't do anything if the value hasn't actually changed. | |
1685 | * If it is changing reset the level on entries that were | |
1686 | * set up to be direct when they were created. | |
1687 | */ | |
1688 | if (smack_cipso_direct != i) { | |
1689 | mutex_lock(&smack_known_lock); | |
1690 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1691 | if (skp->smk_netlabel.attr.mls.lvl == | |
1692 | smack_cipso_direct) | |
1693 | skp->smk_netlabel.attr.mls.lvl = i; | |
1694 | smack_cipso_direct = i; | |
1695 | mutex_unlock(&smack_known_lock); | |
1696 | } | |
e114e473 CS |
1697 | |
1698 | return count; | |
1699 | } | |
1700 | ||
1701 | static const struct file_operations smk_direct_ops = { | |
1702 | .read = smk_read_direct, | |
1703 | .write = smk_write_direct, | |
6038f373 | 1704 | .llseek = default_llseek, |
e114e473 CS |
1705 | }; |
1706 | ||
f7112e6c CS |
1707 | /** |
1708 | * smk_read_mapped - read() for /smack/mapped | |
1709 | * @filp: file pointer, not actually used | |
1710 | * @buf: where to put the result | |
1711 | * @count: maximum to send along | |
1712 | * @ppos: where to start | |
1713 | * | |
1714 | * Returns number of bytes read or error code, as appropriate | |
1715 | */ | |
1716 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1717 | size_t count, loff_t *ppos) | |
1718 | { | |
1719 | char temp[80]; | |
1720 | ssize_t rc; | |
1721 | ||
1722 | if (*ppos != 0) | |
1723 | return 0; | |
1724 | ||
1725 | sprintf(temp, "%d", smack_cipso_mapped); | |
1726 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1727 | ||
1728 | return rc; | |
1729 | } | |
1730 | ||
1731 | /** | |
1732 | * smk_write_mapped - write() for /smack/mapped | |
1733 | * @file: file pointer, not actually used | |
1734 | * @buf: where to get the data from | |
1735 | * @count: bytes sent | |
1736 | * @ppos: where to start | |
1737 | * | |
1738 | * Returns number of bytes written or error code, as appropriate | |
1739 | */ | |
1740 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1741 | size_t count, loff_t *ppos) | |
1742 | { | |
1743 | struct smack_known *skp; | |
1744 | char temp[80]; | |
1745 | int i; | |
1746 | ||
1880eff7 | 1747 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1748 | return -EPERM; |
1749 | ||
1750 | if (count >= sizeof(temp) || count == 0) | |
1751 | return -EINVAL; | |
1752 | ||
1753 | if (copy_from_user(temp, buf, count) != 0) | |
1754 | return -EFAULT; | |
1755 | ||
1756 | temp[count] = '\0'; | |
1757 | ||
1758 | if (sscanf(temp, "%d", &i) != 1) | |
1759 | return -EINVAL; | |
1760 | ||
1761 | /* | |
1762 | * Don't do anything if the value hasn't actually changed. | |
1763 | * If it is changing reset the level on entries that were | |
1764 | * set up to be mapped when they were created. | |
1765 | */ | |
1766 | if (smack_cipso_mapped != i) { | |
1767 | mutex_lock(&smack_known_lock); | |
1768 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1769 | if (skp->smk_netlabel.attr.mls.lvl == | |
1770 | smack_cipso_mapped) | |
1771 | skp->smk_netlabel.attr.mls.lvl = i; | |
1772 | smack_cipso_mapped = i; | |
1773 | mutex_unlock(&smack_known_lock); | |
1774 | } | |
1775 | ||
1776 | return count; | |
1777 | } | |
1778 | ||
1779 | static const struct file_operations smk_mapped_ops = { | |
1780 | .read = smk_read_mapped, | |
1781 | .write = smk_write_mapped, | |
1782 | .llseek = default_llseek, | |
1783 | }; | |
1784 | ||
e114e473 CS |
1785 | /** |
1786 | * smk_read_ambient - read() for /smack/ambient | |
1787 | * @filp: file pointer, not actually used | |
1788 | * @buf: where to put the result | |
1789 | * @cn: maximum to send along | |
1790 | * @ppos: where to start | |
1791 | * | |
1792 | * Returns number of bytes read or error code, as appropriate | |
1793 | */ | |
1794 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1795 | size_t cn, loff_t *ppos) | |
1796 | { | |
1797 | ssize_t rc; | |
e114e473 CS |
1798 | int asize; |
1799 | ||
1800 | if (*ppos != 0) | |
1801 | return 0; | |
1802 | /* | |
1803 | * Being careful to avoid a problem in the case where | |
1804 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1805 | */ |
4bc87e62 | 1806 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1807 | |
2f823ff8 | 1808 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1809 | |
1810 | if (cn >= asize) | |
1811 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1812 | smack_net_ambient->smk_known, |
1813 | asize); | |
4bc87e62 CS |
1814 | else |
1815 | rc = -EINVAL; | |
e114e473 | 1816 | |
4bc87e62 | 1817 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1818 | |
1819 | return rc; | |
1820 | } | |
1821 | ||
1822 | /** | |
1823 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1824 | * @file: file pointer, not actually used |
e114e473 CS |
1825 | * @buf: where to get the data from |
1826 | * @count: bytes sent | |
1827 | * @ppos: where to start | |
1828 | * | |
1829 | * Returns number of bytes written or error code, as appropriate | |
1830 | */ | |
1831 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1832 | size_t count, loff_t *ppos) | |
1833 | { | |
2f823ff8 | 1834 | struct smack_known *skp; |
4bc87e62 | 1835 | char *oldambient; |
f7112e6c CS |
1836 | char *data; |
1837 | int rc = count; | |
e114e473 | 1838 | |
1880eff7 | 1839 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1840 | return -EPERM; |
1841 | ||
16e5c1fc AV |
1842 | data = memdup_user_nul(buf, count); |
1843 | if (IS_ERR(data)) | |
1844 | return PTR_ERR(data); | |
e114e473 | 1845 | |
2f823ff8 | 1846 | skp = smk_import_entry(data, count); |
e774ad68 LP |
1847 | if (IS_ERR(skp)) { |
1848 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1849 | goto out; |
1850 | } | |
e114e473 | 1851 | |
4bc87e62 CS |
1852 | mutex_lock(&smack_ambient_lock); |
1853 | ||
2f823ff8 CS |
1854 | oldambient = smack_net_ambient->smk_known; |
1855 | smack_net_ambient = skp; | |
4bc87e62 CS |
1856 | smk_unlbl_ambient(oldambient); |
1857 | ||
1858 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1859 | |
f7112e6c CS |
1860 | out: |
1861 | kfree(data); | |
1862 | return rc; | |
e114e473 CS |
1863 | } |
1864 | ||
1865 | static const struct file_operations smk_ambient_ops = { | |
1866 | .read = smk_read_ambient, | |
1867 | .write = smk_write_ambient, | |
6038f373 | 1868 | .llseek = default_llseek, |
e114e473 CS |
1869 | }; |
1870 | ||
c0d77c88 RK |
1871 | /* |
1872 | * Seq_file operations for /smack/onlycap | |
15446235 | 1873 | */ |
c0d77c88 | 1874 | static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
15446235 | 1875 | { |
c0d77c88 RK |
1876 | return smk_seq_start(s, pos, &smack_onlycap_list); |
1877 | } | |
15446235 | 1878 | |
c0d77c88 RK |
1879 | static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1880 | { | |
1881 | return smk_seq_next(s, v, pos, &smack_onlycap_list); | |
1882 | } | |
15446235 | 1883 | |
c0d77c88 RK |
1884 | static int onlycap_seq_show(struct seq_file *s, void *v) |
1885 | { | |
1886 | struct list_head *list = v; | |
38416e53 ZJ |
1887 | struct smack_known_list_elem *sklep = |
1888 | list_entry_rcu(list, struct smack_known_list_elem, list); | |
15446235 | 1889 | |
38416e53 | 1890 | seq_puts(s, sklep->smk_label->smk_known); |
c0d77c88 | 1891 | seq_putc(s, ' '); |
15446235 | 1892 | |
c0d77c88 RK |
1893 | return 0; |
1894 | } | |
15446235 | 1895 | |
c0d77c88 RK |
1896 | static const struct seq_operations onlycap_seq_ops = { |
1897 | .start = onlycap_seq_start, | |
1898 | .next = onlycap_seq_next, | |
1899 | .show = onlycap_seq_show, | |
1900 | .stop = smk_seq_stop, | |
1901 | }; | |
1902 | ||
1903 | static int smk_open_onlycap(struct inode *inode, struct file *file) | |
1904 | { | |
1905 | return seq_open(file, &onlycap_seq_ops); | |
1906 | } | |
1907 | ||
1908 | /** | |
1909 | * smk_list_swap_rcu - swap public list with a private one in RCU-safe way | |
1910 | * The caller must hold appropriate mutex to prevent concurrent modifications | |
1911 | * to the public list. | |
1912 | * Private list is assumed to be not accessible to other threads yet. | |
1913 | * | |
1914 | * @public: public list | |
1915 | * @private: private list | |
1916 | */ | |
1917 | static void smk_list_swap_rcu(struct list_head *public, | |
1918 | struct list_head *private) | |
1919 | { | |
1920 | struct list_head *first, *last; | |
1921 | ||
1922 | if (list_empty(public)) { | |
1923 | list_splice_init_rcu(private, public, synchronize_rcu); | |
1924 | } else { | |
1925 | /* Remember public list before replacing it */ | |
1926 | first = public->next; | |
1927 | last = public->prev; | |
1928 | ||
1929 | /* Publish private list in place of public in RCU-safe way */ | |
1930 | private->prev->next = public; | |
1931 | private->next->prev = public; | |
1932 | rcu_assign_pointer(public->next, private->next); | |
1933 | public->prev = private->prev; | |
1934 | ||
1935 | synchronize_rcu(); | |
1936 | ||
1937 | /* When all readers are done with the old public list, | |
1938 | * attach it in place of private */ | |
1939 | private->next = first; | |
1940 | private->prev = last; | |
1941 | first->prev = private; | |
1942 | last->next = private; | |
1943 | } | |
15446235 CS |
1944 | } |
1945 | ||
38416e53 ZJ |
1946 | /** |
1947 | * smk_parse_label_list - parse list of Smack labels, separated by spaces | |
1948 | * | |
1949 | * @data: the string to parse | |
1950 | * @private: destination list | |
1951 | * | |
1952 | * Returns zero on success or error code, as appropriate | |
1953 | */ | |
1954 | static int smk_parse_label_list(char *data, struct list_head *list) | |
1955 | { | |
1956 | char *tok; | |
1957 | struct smack_known *skp; | |
1958 | struct smack_known_list_elem *sklep; | |
1959 | ||
1960 | while ((tok = strsep(&data, " ")) != NULL) { | |
1961 | if (!*tok) | |
1962 | continue; | |
1963 | ||
1964 | skp = smk_import_entry(tok, 0); | |
1965 | if (IS_ERR(skp)) | |
1966 | return PTR_ERR(skp); | |
1967 | ||
1968 | sklep = kzalloc(sizeof(*sklep), GFP_KERNEL); | |
1969 | if (sklep == NULL) | |
1970 | return -ENOMEM; | |
1971 | ||
1972 | sklep->smk_label = skp; | |
1973 | list_add(&sklep->list, list); | |
1974 | } | |
1975 | ||
1976 | return 0; | |
1977 | } | |
1978 | ||
1979 | /** | |
1980 | * smk_destroy_label_list - destroy a list of smack_known_list_elem | |
1981 | * @head: header pointer of the list to destroy | |
1982 | */ | |
1983 | void smk_destroy_label_list(struct list_head *list) | |
1984 | { | |
1985 | struct smack_known_list_elem *sklep; | |
1986 | struct smack_known_list_elem *sklep2; | |
1987 | ||
1988 | list_for_each_entry_safe(sklep, sklep2, list, list) | |
1989 | kfree(sklep); | |
1990 | ||
1991 | INIT_LIST_HEAD(list); | |
1992 | } | |
1993 | ||
15446235 | 1994 | /** |
00f84f3f | 1995 | * smk_write_onlycap - write() for smackfs/onlycap |
251a2a95 | 1996 | * @file: file pointer, not actually used |
15446235 CS |
1997 | * @buf: where to get the data from |
1998 | * @count: bytes sent | |
1999 | * @ppos: where to start | |
2000 | * | |
2001 | * Returns number of bytes written or error code, as appropriate | |
2002 | */ | |
2003 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
2004 | size_t count, loff_t *ppos) | |
2005 | { | |
f7112e6c | 2006 | char *data; |
c0d77c88 | 2007 | LIST_HEAD(list_tmp); |
38416e53 | 2008 | int rc; |
15446235 | 2009 | |
1880eff7 | 2010 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
2011 | return -EPERM; |
2012 | ||
16e5c1fc AV |
2013 | data = memdup_user_nul(buf, count); |
2014 | if (IS_ERR(data)) | |
2015 | return PTR_ERR(data); | |
e774ad68 | 2016 | |
38416e53 | 2017 | rc = smk_parse_label_list(data, &list_tmp); |
c0d77c88 RK |
2018 | kfree(data); |
2019 | ||
15446235 | 2020 | /* |
e774ad68 LP |
2021 | * Clear the smack_onlycap on invalid label errors. This means |
2022 | * that we can pass a null string to unset the onlycap value. | |
f7112e6c | 2023 | * |
e774ad68 | 2024 | * Importing will also reject a label beginning with '-', |
f7112e6c | 2025 | * so "-usecapabilities" will also work. |
e774ad68 LP |
2026 | * |
2027 | * But do so only on invalid label, not on system errors. | |
c0d77c88 | 2028 | * The invalid label must be first to count as clearing attempt. |
15446235 | 2029 | */ |
38416e53 | 2030 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { |
c0d77c88 RK |
2031 | mutex_lock(&smack_onlycap_lock); |
2032 | smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); | |
2033 | mutex_unlock(&smack_onlycap_lock); | |
38416e53 | 2034 | rc = count; |
e774ad68 LP |
2035 | } |
2036 | ||
38416e53 | 2037 | smk_destroy_label_list(&list_tmp); |
15446235 | 2038 | |
f7112e6c | 2039 | return rc; |
15446235 CS |
2040 | } |
2041 | ||
2042 | static const struct file_operations smk_onlycap_ops = { | |
c0d77c88 RK |
2043 | .open = smk_open_onlycap, |
2044 | .read = seq_read, | |
15446235 | 2045 | .write = smk_write_onlycap, |
c0d77c88 RK |
2046 | .llseek = seq_lseek, |
2047 | .release = seq_release, | |
15446235 CS |
2048 | }; |
2049 | ||
bf4b2fee CS |
2050 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2051 | /** | |
2052 | * smk_read_unconfined - read() for smackfs/unconfined | |
2053 | * @filp: file pointer, not actually used | |
2054 | * @buf: where to put the result | |
2055 | * @cn: maximum to send along | |
2056 | * @ppos: where to start | |
2057 | * | |
2058 | * Returns number of bytes read or error code, as appropriate | |
2059 | */ | |
2060 | static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, | |
2061 | size_t cn, loff_t *ppos) | |
2062 | { | |
2063 | char *smack = ""; | |
2064 | ssize_t rc = -EINVAL; | |
2065 | int asize; | |
2066 | ||
2067 | if (*ppos != 0) | |
2068 | return 0; | |
2069 | ||
2070 | if (smack_unconfined != NULL) | |
2071 | smack = smack_unconfined->smk_known; | |
2072 | ||
2073 | asize = strlen(smack) + 1; | |
2074 | ||
2075 | if (cn >= asize) | |
2076 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
2077 | ||
2078 | return rc; | |
2079 | } | |
2080 | ||
2081 | /** | |
2082 | * smk_write_unconfined - write() for smackfs/unconfined | |
2083 | * @file: file pointer, not actually used | |
2084 | * @buf: where to get the data from | |
2085 | * @count: bytes sent | |
2086 | * @ppos: where to start | |
2087 | * | |
2088 | * Returns number of bytes written or error code, as appropriate | |
2089 | */ | |
2090 | static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, | |
2091 | size_t count, loff_t *ppos) | |
2092 | { | |
2093 | char *data; | |
e774ad68 | 2094 | struct smack_known *skp; |
bf4b2fee CS |
2095 | int rc = count; |
2096 | ||
2097 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2098 | return -EPERM; | |
2099 | ||
16e5c1fc AV |
2100 | data = memdup_user_nul(buf, count); |
2101 | if (IS_ERR(data)) | |
2102 | return PTR_ERR(data); | |
e774ad68 | 2103 | |
bf4b2fee | 2104 | /* |
e774ad68 LP |
2105 | * Clear the smack_unconfined on invalid label errors. This means |
2106 | * that we can pass a null string to unset the unconfined value. | |
bf4b2fee | 2107 | * |
e774ad68 | 2108 | * Importing will also reject a label beginning with '-', |
bf4b2fee | 2109 | * so "-confine" will also work. |
e774ad68 LP |
2110 | * |
2111 | * But do so only on invalid label, not on system errors. | |
bf4b2fee | 2112 | */ |
e774ad68 LP |
2113 | skp = smk_import_entry(data, count); |
2114 | if (PTR_ERR(skp) == -EINVAL) | |
2115 | skp = NULL; | |
2116 | else if (IS_ERR(skp)) { | |
2117 | rc = PTR_ERR(skp); | |
2118 | goto freeout; | |
2119 | } | |
2120 | ||
2121 | smack_unconfined = skp; | |
bf4b2fee | 2122 | |
e774ad68 | 2123 | freeout: |
bf4b2fee CS |
2124 | kfree(data); |
2125 | return rc; | |
2126 | } | |
2127 | ||
2128 | static const struct file_operations smk_unconfined_ops = { | |
2129 | .read = smk_read_unconfined, | |
2130 | .write = smk_write_unconfined, | |
2131 | .llseek = default_llseek, | |
2132 | }; | |
2133 | #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ | |
2134 | ||
ecfcc53f EB |
2135 | /** |
2136 | * smk_read_logging - read() for /smack/logging | |
2137 | * @filp: file pointer, not actually used | |
2138 | * @buf: where to put the result | |
2139 | * @cn: maximum to send along | |
2140 | * @ppos: where to start | |
2141 | * | |
2142 | * Returns number of bytes read or error code, as appropriate | |
2143 | */ | |
2144 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
2145 | size_t count, loff_t *ppos) | |
2146 | { | |
2147 | char temp[32]; | |
2148 | ssize_t rc; | |
2149 | ||
2150 | if (*ppos != 0) | |
2151 | return 0; | |
2152 | ||
2153 | sprintf(temp, "%d\n", log_policy); | |
2154 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2155 | return rc; | |
2156 | } | |
2157 | ||
2158 | /** | |
2159 | * smk_write_logging - write() for /smack/logging | |
2160 | * @file: file pointer, not actually used | |
2161 | * @buf: where to get the data from | |
2162 | * @count: bytes sent | |
2163 | * @ppos: where to start | |
2164 | * | |
2165 | * Returns number of bytes written or error code, as appropriate | |
2166 | */ | |
2167 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
2168 | size_t count, loff_t *ppos) | |
2169 | { | |
2170 | char temp[32]; | |
2171 | int i; | |
2172 | ||
1880eff7 | 2173 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
2174 | return -EPERM; |
2175 | ||
2176 | if (count >= sizeof(temp) || count == 0) | |
2177 | return -EINVAL; | |
2178 | ||
2179 | if (copy_from_user(temp, buf, count) != 0) | |
2180 | return -EFAULT; | |
2181 | ||
2182 | temp[count] = '\0'; | |
2183 | ||
2184 | if (sscanf(temp, "%d", &i) != 1) | |
2185 | return -EINVAL; | |
2186 | if (i < 0 || i > 3) | |
2187 | return -EINVAL; | |
2188 | log_policy = i; | |
2189 | return count; | |
2190 | } | |
2191 | ||
2192 | ||
2193 | ||
2194 | static const struct file_operations smk_logging_ops = { | |
2195 | .read = smk_read_logging, | |
2196 | .write = smk_write_logging, | |
6038f373 | 2197 | .llseek = default_llseek, |
ecfcc53f | 2198 | }; |
7898e1f8 CS |
2199 | |
2200 | /* | |
2201 | * Seq_file read operations for /smack/load-self | |
2202 | */ | |
2203 | ||
2204 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
2205 | { | |
2206 | struct task_smack *tsp = current_security(); | |
2207 | ||
40809565 | 2208 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
2209 | } |
2210 | ||
2211 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2212 | { | |
2213 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 2214 | |
40809565 | 2215 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
2216 | } |
2217 | ||
2218 | static int load_self_seq_show(struct seq_file *s, void *v) | |
2219 | { | |
2220 | struct list_head *list = v; | |
2221 | struct smack_rule *srp = | |
01fa8474 | 2222 | list_entry_rcu(list, struct smack_rule, list); |
7898e1f8 | 2223 | |
f7112e6c | 2224 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
2225 | |
2226 | return 0; | |
2227 | } | |
2228 | ||
7898e1f8 CS |
2229 | static const struct seq_operations load_self_seq_ops = { |
2230 | .start = load_self_seq_start, | |
2231 | .next = load_self_seq_next, | |
2232 | .show = load_self_seq_show, | |
40809565 | 2233 | .stop = smk_seq_stop, |
7898e1f8 CS |
2234 | }; |
2235 | ||
2236 | ||
2237 | /** | |
f7112e6c | 2238 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
2239 | * @inode: inode structure representing file |
2240 | * @file: "load" file pointer | |
2241 | * | |
2242 | * For reading, use load_seq_* seq_file reading operations. | |
2243 | */ | |
2244 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
2245 | { | |
2246 | return seq_open(file, &load_self_seq_ops); | |
2247 | } | |
2248 | ||
2249 | /** | |
2250 | * smk_write_load_self - write() for /smack/load-self | |
2251 | * @file: file pointer, not actually used | |
2252 | * @buf: where to get the data from | |
2253 | * @count: bytes sent | |
2254 | * @ppos: where to start - must be 0 | |
2255 | * | |
2256 | */ | |
2257 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
2258 | size_t count, loff_t *ppos) | |
2259 | { | |
2260 | struct task_smack *tsp = current_security(); | |
2261 | ||
f7112e6c CS |
2262 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
2263 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
2264 | } |
2265 | ||
2266 | static const struct file_operations smk_load_self_ops = { | |
2267 | .open = smk_open_load_self, | |
2268 | .read = seq_read, | |
2269 | .llseek = seq_lseek, | |
2270 | .write = smk_write_load_self, | |
2271 | .release = seq_release, | |
2272 | }; | |
828716c2 JS |
2273 | |
2274 | /** | |
f7112e6c | 2275 | * smk_user_access - handle access check transaction |
828716c2 JS |
2276 | * @file: file pointer |
2277 | * @buf: data from user space | |
2278 | * @count: bytes sent | |
2279 | * @ppos: where to start - must be 0 | |
2280 | */ | |
f7112e6c CS |
2281 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
2282 | size_t count, loff_t *ppos, int format) | |
828716c2 | 2283 | { |
e05b6f98 | 2284 | struct smack_parsed_rule rule; |
828716c2 | 2285 | char *data; |
f8859d98 | 2286 | int res; |
828716c2 | 2287 | |
828716c2 JS |
2288 | data = simple_transaction_get(file, buf, count); |
2289 | if (IS_ERR(data)) | |
2290 | return PTR_ERR(data); | |
2291 | ||
f7112e6c CS |
2292 | if (format == SMK_FIXED24_FMT) { |
2293 | if (count < SMK_LOADLEN) | |
2294 | return -EINVAL; | |
2295 | res = smk_parse_rule(data, &rule, 0); | |
2296 | } else { | |
2297 | /* | |
10289b0f | 2298 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 2299 | */ |
10289b0f | 2300 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
2301 | } |
2302 | ||
398ce073 JS |
2303 | if (res >= 0) |
2304 | res = smk_access(rule.smk_subject, rule.smk_object, | |
2305 | rule.smk_access1, NULL); | |
2306 | else if (res != -ENOENT) | |
e774ad68 | 2307 | return res; |
828716c2 | 2308 | |
d166c802 CS |
2309 | /* |
2310 | * smk_access() can return a value > 0 in the "bringup" case. | |
2311 | */ | |
2312 | data[0] = res >= 0 ? '1' : '0'; | |
f8859d98 | 2313 | data[1] = '\0'; |
828716c2 | 2314 | |
d86b2b61 | 2315 | simple_transaction_set(file, 2); |
f7112e6c CS |
2316 | |
2317 | if (format == SMK_FIXED24_FMT) | |
2318 | return SMK_LOADLEN; | |
2319 | return count; | |
2320 | } | |
2321 | ||
2322 | /** | |
2323 | * smk_write_access - handle access check transaction | |
2324 | * @file: file pointer | |
2325 | * @buf: data from user space | |
2326 | * @count: bytes sent | |
2327 | * @ppos: where to start - must be 0 | |
2328 | */ | |
2329 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
2330 | size_t count, loff_t *ppos) | |
2331 | { | |
2332 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
2333 | } |
2334 | ||
2335 | static const struct file_operations smk_access_ops = { | |
2336 | .write = smk_write_access, | |
2337 | .read = simple_transaction_read, | |
2338 | .release = simple_transaction_release, | |
2339 | .llseek = generic_file_llseek, | |
2340 | }; | |
2341 | ||
f7112e6c CS |
2342 | |
2343 | /* | |
2344 | * Seq_file read operations for /smack/load2 | |
2345 | */ | |
2346 | ||
2347 | static int load2_seq_show(struct seq_file *s, void *v) | |
2348 | { | |
2349 | struct list_head *list = v; | |
2350 | struct smack_master_list *smlp = | |
01fa8474 | 2351 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
2352 | |
2353 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
2354 | ||
2355 | return 0; | |
2356 | } | |
2357 | ||
2358 | static const struct seq_operations load2_seq_ops = { | |
2359 | .start = load2_seq_start, | |
2360 | .next = load2_seq_next, | |
2361 | .show = load2_seq_show, | |
2362 | .stop = smk_seq_stop, | |
2363 | }; | |
2364 | ||
2365 | /** | |
2366 | * smk_open_load2 - open() for /smack/load2 | |
2367 | * @inode: inode structure representing file | |
2368 | * @file: "load2" file pointer | |
2369 | * | |
2370 | * For reading, use load2_seq_* seq_file reading operations. | |
2371 | */ | |
2372 | static int smk_open_load2(struct inode *inode, struct file *file) | |
2373 | { | |
2374 | return seq_open(file, &load2_seq_ops); | |
2375 | } | |
2376 | ||
2377 | /** | |
2378 | * smk_write_load2 - write() for /smack/load2 | |
2379 | * @file: file pointer, not actually used | |
2380 | * @buf: where to get the data from | |
2381 | * @count: bytes sent | |
2382 | * @ppos: where to start - must be 0 | |
2383 | * | |
2384 | */ | |
2385 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
2386 | size_t count, loff_t *ppos) | |
2387 | { | |
2388 | /* | |
2389 | * Must have privilege. | |
2390 | */ | |
1880eff7 | 2391 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
2392 | return -EPERM; |
2393 | ||
2394 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2395 | SMK_LONG_FMT); | |
2396 | } | |
2397 | ||
2398 | static const struct file_operations smk_load2_ops = { | |
2399 | .open = smk_open_load2, | |
2400 | .read = seq_read, | |
2401 | .llseek = seq_lseek, | |
2402 | .write = smk_write_load2, | |
2403 | .release = seq_release, | |
2404 | }; | |
2405 | ||
2406 | /* | |
2407 | * Seq_file read operations for /smack/load-self2 | |
2408 | */ | |
2409 | ||
2410 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
2411 | { | |
2412 | struct task_smack *tsp = current_security(); | |
2413 | ||
2414 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
2415 | } | |
2416 | ||
2417 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2418 | { | |
2419 | struct task_smack *tsp = current_security(); | |
2420 | ||
2421 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
2422 | } | |
2423 | ||
2424 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
2425 | { | |
2426 | struct list_head *list = v; | |
2427 | struct smack_rule *srp = | |
01fa8474 | 2428 | list_entry_rcu(list, struct smack_rule, list); |
f7112e6c CS |
2429 | |
2430 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
2431 | ||
2432 | return 0; | |
2433 | } | |
2434 | ||
2435 | static const struct seq_operations load_self2_seq_ops = { | |
2436 | .start = load_self2_seq_start, | |
2437 | .next = load_self2_seq_next, | |
2438 | .show = load_self2_seq_show, | |
2439 | .stop = smk_seq_stop, | |
2440 | }; | |
2441 | ||
2442 | /** | |
2443 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2444 | * @inode: inode structure representing file | |
2445 | * @file: "load" file pointer | |
2446 | * | |
2447 | * For reading, use load_seq_* seq_file reading operations. | |
2448 | */ | |
2449 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2450 | { | |
2451 | return seq_open(file, &load_self2_seq_ops); | |
2452 | } | |
2453 | ||
2454 | /** | |
2455 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2456 | * @file: file pointer, not actually used | |
2457 | * @buf: where to get the data from | |
2458 | * @count: bytes sent | |
2459 | * @ppos: where to start - must be 0 | |
2460 | * | |
2461 | */ | |
2462 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2463 | size_t count, loff_t *ppos) | |
2464 | { | |
2465 | struct task_smack *tsp = current_security(); | |
2466 | ||
2467 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2468 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2469 | } | |
2470 | ||
2471 | static const struct file_operations smk_load_self2_ops = { | |
2472 | .open = smk_open_load_self2, | |
2473 | .read = seq_read, | |
2474 | .llseek = seq_lseek, | |
2475 | .write = smk_write_load_self2, | |
2476 | .release = seq_release, | |
2477 | }; | |
2478 | ||
2479 | /** | |
2480 | * smk_write_access2 - handle access check transaction | |
2481 | * @file: file pointer | |
2482 | * @buf: data from user space | |
2483 | * @count: bytes sent | |
2484 | * @ppos: where to start - must be 0 | |
2485 | */ | |
2486 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2487 | size_t count, loff_t *ppos) | |
2488 | { | |
2489 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2490 | } | |
2491 | ||
2492 | static const struct file_operations smk_access2_ops = { | |
2493 | .write = smk_write_access2, | |
2494 | .read = simple_transaction_read, | |
2495 | .release = simple_transaction_release, | |
2496 | .llseek = generic_file_llseek, | |
2497 | }; | |
2498 | ||
449543b0 RK |
2499 | /** |
2500 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2501 | * @file: file pointer | |
2502 | * @buf: data from user space | |
2503 | * @count: bytes sent | |
2504 | * @ppos: where to start - must be 0 | |
2505 | */ | |
2506 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2507 | size_t count, loff_t *ppos) | |
2508 | { | |
54302094 DC |
2509 | char *data; |
2510 | const char *cp; | |
449543b0 RK |
2511 | struct smack_known *skp; |
2512 | struct smack_rule *sp; | |
2513 | struct list_head *rule_list; | |
2514 | struct mutex *rule_lock; | |
2515 | int rc = count; | |
2516 | ||
2517 | if (*ppos != 0) | |
2518 | return -EINVAL; | |
2519 | ||
2520 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2521 | return -EPERM; | |
2522 | ||
2523 | if (count == 0 || count > SMK_LONGLABEL) | |
2524 | return -EINVAL; | |
2525 | ||
2526 | data = kzalloc(count, GFP_KERNEL); | |
2527 | if (data == NULL) | |
2528 | return -ENOMEM; | |
2529 | ||
2530 | if (copy_from_user(data, buf, count) != 0) { | |
2531 | rc = -EFAULT; | |
54302094 | 2532 | goto out_data; |
449543b0 RK |
2533 | } |
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 | ||
2858 | static 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); | |
3004 | if (err == 0 && rc < 0) | |
3005 | err = rc; | |
3006 | rc = smk_preset_netlabel(&smack_known_invalid); | |
3007 | if (err == 0 && rc < 0) | |
3008 | err = rc; | |
3009 | rc = smk_preset_netlabel(&smack_known_star); | |
3010 | if (err == 0 && rc < 0) | |
3011 | err = rc; | |
3012 | rc = smk_preset_netlabel(&smack_known_web); | |
3013 | if (err == 0 && rc < 0) | |
3014 | err = rc; | |
3015 | ||
e114e473 CS |
3016 | return err; |
3017 | } | |
3018 | ||
3019 | __initcall(init_smk_fs); |