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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 | |
10289b0f | 500 | data = kmalloc(count + 1, GFP_KERNEL); |
828716c2 JS |
501 | if (data == NULL) |
502 | return -ENOMEM; | |
503 | ||
504 | if (copy_from_user(data, buf, count) != 0) { | |
505 | rc = -EFAULT; | |
506 | goto out; | |
507 | } | |
508 | ||
10289b0f RK |
509 | /* |
510 | * In case of parsing only part of user buf, | |
511 | * avoid having partial rule at the data buffer | |
512 | */ | |
513 | if (trunc) { | |
514 | while (count > 0 && (data[count - 1] != '\n')) | |
515 | --count; | |
516 | if (count == 0) { | |
517 | rc = -EINVAL; | |
470043ba | 518 | goto out; |
10289b0f | 519 | } |
f7112e6c CS |
520 | } |
521 | ||
10289b0f RK |
522 | data[count] = '\0'; |
523 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); | |
524 | while (cnt < count) { | |
525 | if (format == SMK_FIXED24_FMT) { | |
526 | rc = smk_parse_rule(data, &rule, 1); | |
e774ad68 | 527 | if (rc < 0) |
10289b0f | 528 | goto out; |
10289b0f RK |
529 | cnt = count; |
530 | } else { | |
531 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); | |
e774ad68 LP |
532 | if (rc < 0) |
533 | goto out; | |
534 | if (rc == 0) { | |
10289b0f RK |
535 | rc = -EINVAL; |
536 | goto out; | |
537 | } | |
538 | cnt += rc; | |
539 | } | |
540 | ||
541 | if (rule_list == NULL) | |
542 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, | |
543 | &rule.smk_subject->smk_rules_lock, 1); | |
544 | else | |
545 | rc = smk_set_access(&rule, rule_list, rule_lock, 0); | |
546 | ||
547 | if (rc) | |
548 | goto out; | |
272cd7a8 CS |
549 | } |
550 | ||
10289b0f | 551 | rc = cnt; |
e114e473 CS |
552 | out: |
553 | kfree(data); | |
554 | return rc; | |
555 | } | |
556 | ||
7898e1f8 | 557 | /* |
40809565 | 558 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
559 | */ |
560 | ||
40809565 CS |
561 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
562 | struct list_head *head) | |
7898e1f8 | 563 | { |
272cd7a8 | 564 | struct list_head *list; |
01fa8474 RK |
565 | int i = *pos; |
566 | ||
567 | rcu_read_lock(); | |
568 | for (list = rcu_dereference(list_next_rcu(head)); | |
569 | list != head; | |
570 | list = rcu_dereference(list_next_rcu(list))) { | |
571 | if (i-- == 0) | |
572 | return list; | |
573 | } | |
272cd7a8 | 574 | |
01fa8474 | 575 | return NULL; |
7898e1f8 CS |
576 | } |
577 | ||
40809565 CS |
578 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
579 | struct list_head *head) | |
7898e1f8 CS |
580 | { |
581 | struct list_head *list = v; | |
582 | ||
01fa8474 RK |
583 | ++*pos; |
584 | list = rcu_dereference(list_next_rcu(list)); | |
585 | ||
586 | return (list == head) ? NULL : list; | |
7898e1f8 CS |
587 | } |
588 | ||
40809565 CS |
589 | static void smk_seq_stop(struct seq_file *s, void *v) |
590 | { | |
01fa8474 | 591 | rcu_read_unlock(); |
40809565 CS |
592 | } |
593 | ||
f7112e6c | 594 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 595 | { |
f7112e6c CS |
596 | /* |
597 | * Don't show any rules with label names too long for | |
598 | * interface file (/smack/load or /smack/load2) | |
599 | * because you should expect to be able to write | |
600 | * anything you read back. | |
601 | */ | |
2f823ff8 | 602 | if (strlen(srp->smk_subject->smk_known) >= max || |
21c7eae2 | 603 | strlen(srp->smk_object->smk_known) >= max) |
f7112e6c | 604 | return; |
7898e1f8 | 605 | |
65ee7f45 RK |
606 | if (srp->smk_access == 0) |
607 | return; | |
608 | ||
21c7eae2 LP |
609 | seq_printf(s, "%s %s", |
610 | srp->smk_subject->smk_known, | |
611 | srp->smk_object->smk_known); | |
7898e1f8 CS |
612 | |
613 | seq_putc(s, ' '); | |
614 | ||
615 | if (srp->smk_access & MAY_READ) | |
616 | seq_putc(s, 'r'); | |
617 | if (srp->smk_access & MAY_WRITE) | |
618 | seq_putc(s, 'w'); | |
619 | if (srp->smk_access & MAY_EXEC) | |
620 | seq_putc(s, 'x'); | |
621 | if (srp->smk_access & MAY_APPEND) | |
622 | seq_putc(s, 'a'); | |
623 | if (srp->smk_access & MAY_TRANSMUTE) | |
624 | seq_putc(s, 't'); | |
c0ab6e56 CS |
625 | if (srp->smk_access & MAY_LOCK) |
626 | seq_putc(s, 'l'); | |
d166c802 CS |
627 | if (srp->smk_access & MAY_BRINGUP) |
628 | seq_putc(s, 'b'); | |
7898e1f8 CS |
629 | |
630 | seq_putc(s, '\n'); | |
f7112e6c CS |
631 | } |
632 | ||
633 | /* | |
634 | * Seq_file read operations for /smack/load | |
635 | */ | |
636 | ||
637 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
638 | { | |
639 | return smk_seq_start(s, pos, &smack_rule_list); | |
640 | } | |
641 | ||
642 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
643 | { | |
644 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
645 | } | |
646 | ||
647 | static int load_seq_show(struct seq_file *s, void *v) | |
648 | { | |
649 | struct list_head *list = v; | |
650 | struct smack_master_list *smlp = | |
01fa8474 | 651 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
652 | |
653 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
654 | |
655 | return 0; | |
656 | } | |
657 | ||
7898e1f8 | 658 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
659 | .start = load2_seq_start, |
660 | .next = load2_seq_next, | |
7898e1f8 | 661 | .show = load_seq_show, |
40809565 | 662 | .stop = smk_seq_stop, |
7898e1f8 CS |
663 | }; |
664 | ||
665 | /** | |
666 | * smk_open_load - open() for /smack/load | |
667 | * @inode: inode structure representing file | |
668 | * @file: "load" file pointer | |
669 | * | |
670 | * For reading, use load_seq_* seq_file reading operations. | |
671 | */ | |
672 | static int smk_open_load(struct inode *inode, struct file *file) | |
673 | { | |
674 | return seq_open(file, &load_seq_ops); | |
675 | } | |
676 | ||
677 | /** | |
678 | * smk_write_load - write() for /smack/load | |
679 | * @file: file pointer, not actually used | |
680 | * @buf: where to get the data from | |
681 | * @count: bytes sent | |
682 | * @ppos: where to start - must be 0 | |
683 | * | |
684 | */ | |
685 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
686 | size_t count, loff_t *ppos) | |
687 | { | |
7898e1f8 CS |
688 | /* |
689 | * Must have privilege. | |
690 | * No partial writes. | |
691 | * Enough data must be present. | |
692 | */ | |
1880eff7 | 693 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
694 | return -EPERM; |
695 | ||
f7112e6c CS |
696 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
697 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
698 | } |
699 | ||
e114e473 CS |
700 | static const struct file_operations smk_load_ops = { |
701 | .open = smk_open_load, | |
702 | .read = seq_read, | |
703 | .llseek = seq_lseek, | |
704 | .write = smk_write_load, | |
cb622bbb | 705 | .release = seq_release, |
e114e473 CS |
706 | }; |
707 | ||
708 | /** | |
709 | * smk_cipso_doi - initialize the CIPSO domain | |
710 | */ | |
30aa4faf | 711 | static void smk_cipso_doi(void) |
e114e473 CS |
712 | { |
713 | int rc; | |
714 | struct cipso_v4_doi *doip; | |
6d3dc07c | 715 | struct netlbl_audit nai; |
e114e473 | 716 | |
6d3dc07c | 717 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 718 | |
6d3dc07c | 719 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
720 | if (rc != 0) |
721 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
722 | __func__, __LINE__, rc); | |
723 | ||
724 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
725 | if (doip == NULL) | |
726 | panic("smack: Failed to initialize cipso DOI.\n"); | |
727 | doip->map.std = NULL; | |
728 | doip->doi = smk_cipso_doi_value; | |
729 | doip->type = CIPSO_V4_MAP_PASS; | |
730 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
731 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
732 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
733 | ||
6d3dc07c | 734 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 735 | if (rc != 0) { |
6c2e8ac0 PM |
736 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
737 | __func__, __LINE__, rc); | |
738 | kfree(doip); | |
739 | return; | |
740 | } | |
6d3dc07c | 741 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
742 | if (rc != 0) { |
743 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 744 | __func__, __LINE__, rc); |
b1edeb10 | 745 | kfree(doip); |
6c2e8ac0 | 746 | return; |
b1edeb10 | 747 | } |
e114e473 CS |
748 | } |
749 | ||
4bc87e62 CS |
750 | /** |
751 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 752 | * @oldambient: previous domain string |
4bc87e62 | 753 | */ |
30aa4faf | 754 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
755 | { |
756 | int rc; | |
6d3dc07c | 757 | struct netlbl_audit nai; |
4bc87e62 | 758 | |
6d3dc07c | 759 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
760 | |
761 | if (oldambient != NULL) { | |
6d3dc07c | 762 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
763 | if (rc != 0) |
764 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
765 | __func__, __LINE__, rc); | |
766 | } | |
f7112e6c | 767 | if (smack_net_ambient == NULL) |
2f823ff8 | 768 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 769 | |
2f823ff8 | 770 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 771 | NULL, NULL, &nai); |
4bc87e62 CS |
772 | if (rc != 0) |
773 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
774 | __func__, __LINE__, rc); | |
775 | } | |
776 | ||
e114e473 CS |
777 | /* |
778 | * Seq_file read operations for /smack/cipso | |
779 | */ | |
780 | ||
781 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
782 | { | |
40809565 | 783 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
784 | } |
785 | ||
786 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
787 | { | |
40809565 | 788 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
789 | } |
790 | ||
791 | /* | |
792 | * Print cipso labels in format: | |
793 | * label level[/cat[,cat]] | |
794 | */ | |
795 | static int cipso_seq_show(struct seq_file *s, void *v) | |
796 | { | |
7198e2ee EB |
797 | struct list_head *list = v; |
798 | struct smack_known *skp = | |
01fa8474 | 799 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 800 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 801 | char sep = '/'; |
e114e473 | 802 | int i; |
e114e473 | 803 | |
f7112e6c CS |
804 | /* |
805 | * Don't show a label that could not have been set using | |
806 | * /smack/cipso. This is in support of the notion that | |
807 | * anything read from /smack/cipso ought to be writeable | |
808 | * to /smack/cipso. | |
809 | * | |
810 | * /smack/cipso2 should be used instead. | |
811 | */ | |
812 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
813 | return 0; |
814 | ||
f7112e6c | 815 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 816 | |
4fbe63d1 PM |
817 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
818 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
819 | seq_printf(s, "%c%d", sep, i); |
820 | sep = ','; | |
821 | } | |
e114e473 CS |
822 | |
823 | seq_putc(s, '\n'); | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
88e9d34c | 828 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 829 | .start = cipso_seq_start, |
e114e473 CS |
830 | .next = cipso_seq_next, |
831 | .show = cipso_seq_show, | |
40809565 | 832 | .stop = smk_seq_stop, |
e114e473 CS |
833 | }; |
834 | ||
835 | /** | |
836 | * smk_open_cipso - open() for /smack/cipso | |
837 | * @inode: inode structure representing file | |
838 | * @file: "cipso" file pointer | |
839 | * | |
840 | * Connect our cipso_seq_* operations with /smack/cipso | |
841 | * file_operations | |
842 | */ | |
843 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
844 | { | |
845 | return seq_open(file, &cipso_seq_ops); | |
846 | } | |
847 | ||
848 | /** | |
f7112e6c | 849 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 850 | * @file: file pointer, not actually used |
e114e473 CS |
851 | * @buf: where to get the data from |
852 | * @count: bytes sent | |
853 | * @ppos: where to start | |
f7112e6c | 854 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
855 | * |
856 | * Accepts only one cipso rule per write call. | |
857 | * Returns number of bytes written or error code, as appropriate | |
858 | */ | |
f7112e6c CS |
859 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
860 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
861 | { |
862 | struct smack_known *skp; | |
f7112e6c CS |
863 | struct netlbl_lsm_secattr ncats; |
864 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 865 | int maplevel; |
f7112e6c | 866 | unsigned int cat; |
e114e473 CS |
867 | int catlen; |
868 | ssize_t rc = -EINVAL; | |
869 | char *data = NULL; | |
870 | char *rule; | |
871 | int ret; | |
872 | int i; | |
873 | ||
874 | /* | |
875 | * Must have privilege. | |
876 | * No partial writes. | |
877 | * Enough data must be present. | |
878 | */ | |
1880eff7 | 879 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
880 | return -EPERM; |
881 | if (*ppos != 0) | |
882 | return -EINVAL; | |
f7112e6c CS |
883 | if (format == SMK_FIXED24_FMT && |
884 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
885 | return -EINVAL; |
886 | ||
887 | data = kzalloc(count + 1, GFP_KERNEL); | |
888 | if (data == NULL) | |
889 | return -ENOMEM; | |
890 | ||
891 | if (copy_from_user(data, buf, count) != 0) { | |
892 | rc = -EFAULT; | |
893 | goto unlockedout; | |
894 | } | |
895 | ||
896 | data[count] = '\0'; | |
897 | rule = data; | |
898 | /* | |
899 | * Only allow one writer at a time. Writes should be | |
900 | * quite rare and small in any case. | |
901 | */ | |
902 | mutex_lock(&smack_cipso_lock); | |
903 | ||
904 | skp = smk_import_entry(rule, 0); | |
e774ad68 LP |
905 | if (IS_ERR(skp)) { |
906 | rc = PTR_ERR(skp); | |
e114e473 | 907 | goto out; |
e774ad68 | 908 | } |
e114e473 | 909 | |
f7112e6c CS |
910 | if (format == SMK_FIXED24_FMT) |
911 | rule += SMK_LABELLEN; | |
912 | else | |
0fcfee61 | 913 | rule += strlen(skp->smk_known) + 1; |
f7112e6c | 914 | |
e114e473 CS |
915 | ret = sscanf(rule, "%d", &maplevel); |
916 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
917 | goto out; | |
918 | ||
919 | rule += SMK_DIGITLEN; | |
920 | ret = sscanf(rule, "%d", &catlen); | |
921 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
922 | goto out; | |
923 | ||
f7112e6c CS |
924 | if (format == SMK_FIXED24_FMT && |
925 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
926 | goto out; |
927 | ||
928 | memset(mapcatset, 0, sizeof(mapcatset)); | |
929 | ||
930 | for (i = 0; i < catlen; i++) { | |
931 | rule += SMK_DIGITLEN; | |
f7112e6c | 932 | ret = sscanf(rule, "%u", &cat); |
677264e8 | 933 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
934 | goto out; |
935 | ||
936 | smack_catset_bit(cat, mapcatset); | |
937 | } | |
938 | ||
f7112e6c CS |
939 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
940 | if (rc >= 0) { | |
4fbe63d1 | 941 | netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat); |
f7112e6c CS |
942 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
943 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
944 | rc = count; | |
e114e473 CS |
945 | } |
946 | ||
e114e473 CS |
947 | out: |
948 | mutex_unlock(&smack_cipso_lock); | |
949 | unlockedout: | |
950 | kfree(data); | |
951 | return rc; | |
952 | } | |
953 | ||
f7112e6c CS |
954 | /** |
955 | * smk_write_cipso - write() for /smack/cipso | |
956 | * @file: file pointer, not actually used | |
957 | * @buf: where to get the data from | |
958 | * @count: bytes sent | |
959 | * @ppos: where to start | |
960 | * | |
961 | * Accepts only one cipso rule per write call. | |
962 | * Returns number of bytes written or error code, as appropriate | |
963 | */ | |
964 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
965 | size_t count, loff_t *ppos) | |
966 | { | |
967 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
968 | } | |
969 | ||
e114e473 CS |
970 | static const struct file_operations smk_cipso_ops = { |
971 | .open = smk_open_cipso, | |
972 | .read = seq_read, | |
973 | .llseek = seq_lseek, | |
974 | .write = smk_write_cipso, | |
975 | .release = seq_release, | |
976 | }; | |
977 | ||
f7112e6c CS |
978 | /* |
979 | * Seq_file read operations for /smack/cipso2 | |
980 | */ | |
981 | ||
982 | /* | |
983 | * Print cipso labels in format: | |
984 | * label level[/cat[,cat]] | |
985 | */ | |
986 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
987 | { | |
988 | struct list_head *list = v; | |
989 | struct smack_known *skp = | |
01fa8474 | 990 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 991 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
f7112e6c CS |
992 | char sep = '/'; |
993 | int i; | |
994 | ||
995 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
996 | ||
4fbe63d1 PM |
997 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
998 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
999 | seq_printf(s, "%c%d", sep, i); |
1000 | sep = ','; | |
1001 | } | |
1002 | ||
1003 | seq_putc(s, '\n'); | |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | static const struct seq_operations cipso2_seq_ops = { | |
1009 | .start = cipso_seq_start, | |
1010 | .next = cipso_seq_next, | |
1011 | .show = cipso2_seq_show, | |
1012 | .stop = smk_seq_stop, | |
1013 | }; | |
1014 | ||
1015 | /** | |
1016 | * smk_open_cipso2 - open() for /smack/cipso2 | |
1017 | * @inode: inode structure representing file | |
1018 | * @file: "cipso2" file pointer | |
1019 | * | |
1020 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
1021 | * file_operations | |
1022 | */ | |
1023 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
1024 | { | |
1025 | return seq_open(file, &cipso2_seq_ops); | |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * smk_write_cipso2 - write() for /smack/cipso2 | |
1030 | * @file: file pointer, not actually used | |
1031 | * @buf: where to get the data from | |
1032 | * @count: bytes sent | |
1033 | * @ppos: where to start | |
1034 | * | |
1035 | * Accepts only one cipso rule per write call. | |
1036 | * Returns number of bytes written or error code, as appropriate | |
1037 | */ | |
1038 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1039 | size_t count, loff_t *ppos) | |
1040 | { | |
1041 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1042 | } | |
1043 | ||
1044 | static const struct file_operations smk_cipso2_ops = { | |
1045 | .open = smk_open_cipso2, | |
1046 | .read = seq_read, | |
1047 | .llseek = seq_lseek, | |
1048 | .write = smk_write_cipso2, | |
1049 | .release = seq_release, | |
1050 | }; | |
1051 | ||
6d3dc07c CS |
1052 | /* |
1053 | * Seq_file read operations for /smack/netlabel | |
1054 | */ | |
1055 | ||
21abb1ec | 1056 | static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
6d3dc07c | 1057 | { |
21abb1ec | 1058 | return smk_seq_start(s, pos, &smk_net4addr_list); |
6d3dc07c CS |
1059 | } |
1060 | ||
21abb1ec | 1061 | static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
6d3dc07c | 1062 | { |
21abb1ec | 1063 | return smk_seq_next(s, v, pos, &smk_net4addr_list); |
6d3dc07c | 1064 | } |
6d3dc07c CS |
1065 | |
1066 | /* | |
1067 | * Print host/label pairs | |
1068 | */ | |
21abb1ec | 1069 | static int net4addr_seq_show(struct seq_file *s, void *v) |
6d3dc07c | 1070 | { |
7198e2ee | 1071 | struct list_head *list = v; |
21abb1ec CS |
1072 | struct smk_net4addr *skp = |
1073 | list_entry_rcu(list, struct smk_net4addr, list); | |
1074 | char *kp = SMACK_CIPSO_OPTION; | |
6d3dc07c | 1075 | |
21abb1ec CS |
1076 | if (skp->smk_label != NULL) |
1077 | kp = skp->smk_label->smk_known; | |
1078 | seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr, | |
1079 | skp->smk_masks, kp); | |
6d3dc07c CS |
1080 | |
1081 | return 0; | |
1082 | } | |
1083 | ||
21abb1ec CS |
1084 | static const struct seq_operations net4addr_seq_ops = { |
1085 | .start = net4addr_seq_start, | |
1086 | .next = net4addr_seq_next, | |
1087 | .show = net4addr_seq_show, | |
40809565 | 1088 | .stop = smk_seq_stop, |
6d3dc07c CS |
1089 | }; |
1090 | ||
1091 | /** | |
21abb1ec | 1092 | * smk_open_net4addr - open() for /smack/netlabel |
6d3dc07c CS |
1093 | * @inode: inode structure representing file |
1094 | * @file: "netlabel" file pointer | |
1095 | * | |
21abb1ec | 1096 | * Connect our net4addr_seq_* operations with /smack/netlabel |
6d3dc07c CS |
1097 | * file_operations |
1098 | */ | |
21abb1ec | 1099 | static int smk_open_net4addr(struct inode *inode, struct file *file) |
6d3dc07c | 1100 | { |
21abb1ec | 1101 | return seq_open(file, &net4addr_seq_ops); |
6d3dc07c CS |
1102 | } |
1103 | ||
113a0e45 | 1104 | /** |
21abb1ec | 1105 | * smk_net4addr_insert |
113a0e45 | 1106 | * @new : netlabel to insert |
1107 | * | |
21abb1ec | 1108 | * This helper insert netlabel in the smack_net4addrs list |
113a0e45 | 1109 | * sorted by netmask length (longest to smallest) |
21abb1ec | 1110 | * locked by &smk_net4addr_lock in smk_write_net4addr |
7198e2ee | 1111 | * |
113a0e45 | 1112 | */ |
21abb1ec | 1113 | static void smk_net4addr_insert(struct smk_net4addr *new) |
113a0e45 | 1114 | { |
21abb1ec CS |
1115 | struct smk_net4addr *m; |
1116 | struct smk_net4addr *m_next; | |
113a0e45 | 1117 | |
21abb1ec CS |
1118 | if (list_empty(&smk_net4addr_list)) { |
1119 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1120 | return; |
1121 | } | |
1122 | ||
21abb1ec CS |
1123 | m = list_entry_rcu(smk_net4addr_list.next, |
1124 | struct smk_net4addr, list); | |
7198e2ee | 1125 | |
113a0e45 | 1126 | /* the comparison '>' is a bit hacky, but works */ |
21abb1ec CS |
1127 | if (new->smk_masks > m->smk_masks) { |
1128 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1129 | return; |
1130 | } | |
7198e2ee | 1131 | |
21abb1ec CS |
1132 | list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
1133 | if (list_is_last(&m->list, &smk_net4addr_list)) { | |
7198e2ee | 1134 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1135 | return; |
1136 | } | |
05725f7e | 1137 | m_next = list_entry_rcu(m->list.next, |
21abb1ec CS |
1138 | struct smk_net4addr, list); |
1139 | if (new->smk_masks > m_next->smk_masks) { | |
7198e2ee | 1140 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1141 | return; |
1142 | } | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | ||
6d3dc07c | 1147 | /** |
21abb1ec | 1148 | * smk_write_net4addr - write() for /smack/netlabel |
251a2a95 | 1149 | * @file: file pointer, not actually used |
6d3dc07c CS |
1150 | * @buf: where to get the data from |
1151 | * @count: bytes sent | |
1152 | * @ppos: where to start | |
1153 | * | |
21abb1ec | 1154 | * Accepts only one net4addr per write call. |
6d3dc07c CS |
1155 | * Returns number of bytes written or error code, as appropriate |
1156 | */ | |
21abb1ec | 1157 | static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
6d3dc07c CS |
1158 | size_t count, loff_t *ppos) |
1159 | { | |
21abb1ec | 1160 | struct smk_net4addr *snp; |
6d3dc07c | 1161 | struct sockaddr_in newname; |
f7112e6c | 1162 | char *smack; |
21abb1ec | 1163 | struct smack_known *skp = NULL; |
f7112e6c | 1164 | char *data; |
6d3dc07c CS |
1165 | char *host = (char *)&newname.sin_addr.s_addr; |
1166 | int rc; | |
1167 | struct netlbl_audit audit_info; | |
1168 | struct in_addr mask; | |
1169 | unsigned int m; | |
21abb1ec | 1170 | unsigned int masks; |
7198e2ee | 1171 | int found; |
113a0e45 | 1172 | u32 mask_bits = (1<<31); |
6d3dc07c | 1173 | __be32 nsa; |
113a0e45 | 1174 | u32 temp_mask; |
6d3dc07c CS |
1175 | |
1176 | /* | |
1177 | * Must have privilege. | |
1178 | * No partial writes. | |
1179 | * Enough data must be present. | |
1180 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1181 | * "<addr, as a.b.c.d><space><label>" | |
1182 | */ | |
1880eff7 | 1183 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1184 | return -EPERM; |
1185 | if (*ppos != 0) | |
1186 | return -EINVAL; | |
f7112e6c | 1187 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1188 | return -EINVAL; |
f7112e6c CS |
1189 | |
1190 | data = kzalloc(count + 1, GFP_KERNEL); | |
1191 | if (data == NULL) | |
1192 | return -ENOMEM; | |
1193 | ||
1194 | if (copy_from_user(data, buf, count) != 0) { | |
1195 | rc = -EFAULT; | |
1196 | goto free_data_out; | |
1197 | } | |
1198 | ||
1199 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1200 | if (smack == NULL) { | |
1201 | rc = -ENOMEM; | |
1202 | goto free_data_out; | |
1203 | } | |
6d3dc07c CS |
1204 | |
1205 | data[count] = '\0'; | |
1206 | ||
ec554fa7 | 1207 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
21abb1ec | 1208 | &host[0], &host[1], &host[2], &host[3], &masks, smack); |
6d3dc07c CS |
1209 | if (rc != 6) { |
1210 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1211 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1212 | if (rc != 5) { |
1213 | rc = -EINVAL; | |
1214 | goto free_out; | |
1215 | } | |
6d3dc07c | 1216 | m = BEBITS; |
21abb1ec | 1217 | masks = 32; |
6d3dc07c | 1218 | } |
21abb1ec | 1219 | if (masks > BEBITS) { |
f7112e6c CS |
1220 | rc = -EINVAL; |
1221 | goto free_out; | |
1222 | } | |
6d3dc07c | 1223 | |
f7112e6c CS |
1224 | /* |
1225 | * If smack begins with '-', it is an option, don't import it | |
1226 | */ | |
4303154e | 1227 | if (smack[0] != '-') { |
21c7eae2 | 1228 | skp = smk_import_entry(smack, 0); |
e774ad68 LP |
1229 | if (IS_ERR(skp)) { |
1230 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1231 | goto free_out; |
1232 | } | |
4303154e | 1233 | } else { |
21abb1ec CS |
1234 | /* |
1235 | * Only the -CIPSO option is supported for IPv4 | |
1236 | */ | |
1237 | if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { | |
f7112e6c CS |
1238 | rc = -EINVAL; |
1239 | goto free_out; | |
1240 | } | |
4303154e | 1241 | } |
6d3dc07c | 1242 | |
21abb1ec | 1243 | for (m = masks, temp_mask = 0; m > 0; m--) { |
113a0e45 | 1244 | temp_mask |= mask_bits; |
1245 | mask_bits >>= 1; | |
6d3dc07c | 1246 | } |
113a0e45 | 1247 | mask.s_addr = cpu_to_be32(temp_mask); |
1248 | ||
1249 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1250 | /* |
1251 | * Only allow one writer at a time. Writes should be | |
1252 | * quite rare and small in any case. | |
1253 | */ | |
21abb1ec | 1254 | mutex_lock(&smk_net4addr_lock); |
6d3dc07c CS |
1255 | |
1256 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1257 | /* try to find if the prefix is already in the list */ |
7198e2ee | 1258 | found = 0; |
21abb1ec CS |
1259 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
1260 | if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { | |
7198e2ee | 1261 | found = 1; |
6d3dc07c | 1262 | break; |
7198e2ee EB |
1263 | } |
1264 | } | |
6d3dc07c CS |
1265 | smk_netlabel_audit_set(&audit_info); |
1266 | ||
7198e2ee | 1267 | if (found == 0) { |
21c7eae2 LP |
1268 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
1269 | if (snp == NULL) | |
6d3dc07c CS |
1270 | rc = -ENOMEM; |
1271 | else { | |
1272 | rc = 0; | |
21abb1ec | 1273 | snp->smk_host.s_addr = newname.sin_addr.s_addr; |
21c7eae2 LP |
1274 | snp->smk_mask.s_addr = mask.s_addr; |
1275 | snp->smk_label = skp; | |
21abb1ec CS |
1276 | snp->smk_masks = masks; |
1277 | smk_net4addr_insert(snp); | |
6d3dc07c CS |
1278 | } |
1279 | } else { | |
21abb1ec CS |
1280 | /* |
1281 | * Delete the unlabeled entry, only if the previous label | |
1282 | * wasn't the special CIPSO option | |
1283 | */ | |
1284 | if (snp->smk_label != NULL) | |
4303154e | 1285 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
21abb1ec | 1286 | &snp->smk_host, &snp->smk_mask, |
4303154e EB |
1287 | PF_INET, &audit_info); |
1288 | else | |
1289 | rc = 0; | |
21c7eae2 | 1290 | snp->smk_label = skp; |
6d3dc07c CS |
1291 | } |
1292 | ||
1293 | /* | |
1294 | * Now tell netlabel about the single label nature of | |
1295 | * this host so that incoming packets get labeled. | |
4303154e | 1296 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1297 | */ |
21abb1ec | 1298 | if (rc == 0 && skp != NULL) |
6d3dc07c | 1299 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
21abb1ec | 1300 | &snp->smk_host, &snp->smk_mask, PF_INET, |
21c7eae2 | 1301 | snp->smk_label->smk_secid, &audit_info); |
6d3dc07c CS |
1302 | |
1303 | if (rc == 0) | |
1304 | rc = count; | |
1305 | ||
21abb1ec CS |
1306 | mutex_unlock(&smk_net4addr_lock); |
1307 | ||
1308 | free_out: | |
1309 | kfree(smack); | |
1310 | free_data_out: | |
1311 | kfree(data); | |
1312 | ||
1313 | return rc; | |
1314 | } | |
1315 | ||
1316 | static const struct file_operations smk_net4addr_ops = { | |
1317 | .open = smk_open_net4addr, | |
1318 | .read = seq_read, | |
1319 | .llseek = seq_lseek, | |
1320 | .write = smk_write_net4addr, | |
1321 | .release = seq_release, | |
1322 | }; | |
1323 | ||
1324 | #if IS_ENABLED(CONFIG_IPV6) | |
1325 | /* | |
1326 | * Seq_file read operations for /smack/netlabel6 | |
1327 | */ | |
1328 | ||
1329 | static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) | |
1330 | { | |
1331 | return smk_seq_start(s, pos, &smk_net6addr_list); | |
1332 | } | |
1333 | ||
1334 | static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1335 | { | |
1336 | return smk_seq_next(s, v, pos, &smk_net6addr_list); | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Print host/label pairs | |
1341 | */ | |
1342 | static int net6addr_seq_show(struct seq_file *s, void *v) | |
1343 | { | |
1344 | struct list_head *list = v; | |
1345 | struct smk_net6addr *skp = | |
1346 | list_entry(list, struct smk_net6addr, list); | |
1347 | ||
1348 | if (skp->smk_label != NULL) | |
1349 | seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks, | |
1350 | skp->smk_label->smk_known); | |
1351 | ||
1352 | return 0; | |
1353 | } | |
1354 | ||
1355 | static const struct seq_operations net6addr_seq_ops = { | |
1356 | .start = net6addr_seq_start, | |
1357 | .next = net6addr_seq_next, | |
1358 | .show = net6addr_seq_show, | |
1359 | .stop = smk_seq_stop, | |
1360 | }; | |
1361 | ||
1362 | /** | |
1363 | * smk_open_net6addr - open() for /smack/netlabel | |
1364 | * @inode: inode structure representing file | |
1365 | * @file: "netlabel" file pointer | |
1366 | * | |
1367 | * Connect our net6addr_seq_* operations with /smack/netlabel | |
1368 | * file_operations | |
1369 | */ | |
1370 | static int smk_open_net6addr(struct inode *inode, struct file *file) | |
1371 | { | |
1372 | return seq_open(file, &net6addr_seq_ops); | |
1373 | } | |
1374 | ||
1375 | /** | |
1376 | * smk_net6addr_insert | |
1377 | * @new : entry to insert | |
1378 | * | |
1379 | * This inserts an entry in the smack_net6addrs list | |
1380 | * sorted by netmask length (longest to smallest) | |
1381 | * locked by &smk_net6addr_lock in smk_write_net6addr | |
1382 | * | |
1383 | */ | |
1384 | static void smk_net6addr_insert(struct smk_net6addr *new) | |
1385 | { | |
1386 | struct smk_net6addr *m_next; | |
1387 | struct smk_net6addr *m; | |
1388 | ||
1389 | if (list_empty(&smk_net6addr_list)) { | |
1390 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1391 | return; | |
1392 | } | |
1393 | ||
1394 | m = list_entry_rcu(smk_net6addr_list.next, | |
1395 | struct smk_net6addr, list); | |
1396 | ||
1397 | if (new->smk_masks > m->smk_masks) { | |
1398 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1399 | return; | |
1400 | } | |
1401 | ||
1402 | list_for_each_entry_rcu(m, &smk_net6addr_list, list) { | |
1403 | if (list_is_last(&m->list, &smk_net6addr_list)) { | |
1404 | list_add_rcu(&new->list, &m->list); | |
1405 | return; | |
1406 | } | |
1407 | m_next = list_entry_rcu(m->list.next, | |
1408 | struct smk_net6addr, list); | |
1409 | if (new->smk_masks > m_next->smk_masks) { | |
1410 | list_add_rcu(&new->list, &m->list); | |
1411 | return; | |
1412 | } | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | ||
1417 | /** | |
1418 | * smk_write_net6addr - write() for /smack/netlabel | |
1419 | * @file: file pointer, not actually used | |
1420 | * @buf: where to get the data from | |
1421 | * @count: bytes sent | |
1422 | * @ppos: where to start | |
1423 | * | |
1424 | * Accepts only one net6addr per write call. | |
1425 | * Returns number of bytes written or error code, as appropriate | |
1426 | */ | |
1427 | static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, | |
1428 | size_t count, loff_t *ppos) | |
1429 | { | |
1430 | struct smk_net6addr *snp; | |
1431 | struct in6_addr newname; | |
1432 | struct in6_addr fullmask; | |
1433 | struct smack_known *skp = NULL; | |
1434 | char *smack; | |
1435 | char *data; | |
1436 | int rc = 0; | |
1437 | int found = 0; | |
1438 | int i; | |
1439 | unsigned int scanned[8]; | |
1440 | unsigned int m; | |
1441 | unsigned int mask = 128; | |
1442 | ||
1443 | /* | |
1444 | * Must have privilege. | |
1445 | * No partial writes. | |
1446 | * Enough data must be present. | |
1447 | * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" | |
1448 | * "<addr, as a:b:c:d:e:f:g:h><space><label>" | |
1449 | */ | |
1450 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
1451 | return -EPERM; | |
1452 | if (*ppos != 0) | |
1453 | return -EINVAL; | |
1454 | if (count < SMK_NETLBLADDRMIN) | |
1455 | return -EINVAL; | |
1456 | ||
1457 | data = kzalloc(count + 1, GFP_KERNEL); | |
1458 | if (data == NULL) | |
1459 | return -ENOMEM; | |
1460 | ||
1461 | if (copy_from_user(data, buf, count) != 0) { | |
1462 | rc = -EFAULT; | |
1463 | goto free_data_out; | |
1464 | } | |
1465 | ||
1466 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1467 | if (smack == NULL) { | |
1468 | rc = -ENOMEM; | |
1469 | goto free_data_out; | |
1470 | } | |
1471 | ||
1472 | data[count] = '\0'; | |
1473 | ||
1474 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s", | |
1475 | &scanned[0], &scanned[1], &scanned[2], &scanned[3], | |
1476 | &scanned[4], &scanned[5], &scanned[6], &scanned[7], | |
1477 | &mask, smack); | |
1478 | if (i != 10) { | |
1479 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s", | |
1480 | &scanned[0], &scanned[1], &scanned[2], | |
1481 | &scanned[3], &scanned[4], &scanned[5], | |
1482 | &scanned[6], &scanned[7], smack); | |
1483 | if (i != 9) { | |
1484 | rc = -EINVAL; | |
1485 | goto free_out; | |
1486 | } | |
1487 | } | |
1488 | if (mask > 128) { | |
1489 | rc = -EINVAL; | |
1490 | goto free_out; | |
1491 | } | |
1492 | for (i = 0; i < 8; i++) { | |
1493 | if (scanned[i] > 0xffff) { | |
1494 | rc = -EINVAL; | |
1495 | goto free_out; | |
1496 | } | |
1497 | newname.s6_addr16[i] = htons(scanned[i]); | |
1498 | } | |
1499 | ||
1500 | /* | |
1501 | * If smack begins with '-', it is an option, don't import it | |
1502 | */ | |
1503 | if (smack[0] != '-') { | |
1504 | skp = smk_import_entry(smack, 0); | |
5f2bfe2f LP |
1505 | if (IS_ERR(skp)) { |
1506 | rc = PTR_ERR(skp); | |
21abb1ec CS |
1507 | goto free_out; |
1508 | } | |
1509 | } else { | |
1510 | /* | |
1511 | * Only -DELETE is supported for IPv6 | |
1512 | */ | |
1513 | if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { | |
1514 | rc = -EINVAL; | |
1515 | goto free_out; | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | for (i = 0, m = mask; i < 8; i++) { | |
1520 | if (m >= 16) { | |
1521 | fullmask.s6_addr16[i] = 0xffff; | |
1522 | m -= 16; | |
1523 | } else if (m > 0) { | |
1524 | fullmask.s6_addr16[i] = (1 << m) - 1; | |
1525 | m = 0; | |
1526 | } else | |
1527 | fullmask.s6_addr16[i] = 0; | |
1528 | newname.s6_addr16[i] &= fullmask.s6_addr16[i]; | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Only allow one writer at a time. Writes should be | |
1533 | * quite rare and small in any case. | |
1534 | */ | |
1535 | mutex_lock(&smk_net6addr_lock); | |
1536 | /* | |
1537 | * Try to find the prefix in the list | |
1538 | */ | |
1539 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
1540 | if (mask != snp->smk_masks) | |
1541 | continue; | |
1542 | for (found = 1, i = 0; i < 8; i++) { | |
1543 | if (newname.s6_addr16[i] != | |
1544 | snp->smk_host.s6_addr16[i]) { | |
1545 | found = 0; | |
1546 | break; | |
1547 | } | |
1548 | } | |
1549 | if (found == 1) | |
1550 | break; | |
1551 | } | |
1552 | if (found == 0) { | |
1553 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); | |
1554 | if (snp == NULL) | |
1555 | rc = -ENOMEM; | |
1556 | else { | |
1557 | snp->smk_host = newname; | |
1558 | snp->smk_mask = fullmask; | |
1559 | snp->smk_masks = mask; | |
1560 | snp->smk_label = skp; | |
1561 | smk_net6addr_insert(snp); | |
1562 | } | |
1563 | } else { | |
1564 | snp->smk_label = skp; | |
1565 | } | |
1566 | ||
1567 | if (rc == 0) | |
1568 | rc = count; | |
1569 | ||
1570 | mutex_unlock(&smk_net6addr_lock); | |
6d3dc07c | 1571 | |
f7112e6c CS |
1572 | free_out: |
1573 | kfree(smack); | |
1574 | free_data_out: | |
1575 | kfree(data); | |
1576 | ||
6d3dc07c CS |
1577 | return rc; |
1578 | } | |
1579 | ||
21abb1ec CS |
1580 | static const struct file_operations smk_net6addr_ops = { |
1581 | .open = smk_open_net6addr, | |
6d3dc07c CS |
1582 | .read = seq_read, |
1583 | .llseek = seq_lseek, | |
21abb1ec | 1584 | .write = smk_write_net6addr, |
6d3dc07c CS |
1585 | .release = seq_release, |
1586 | }; | |
21abb1ec | 1587 | #endif /* CONFIG_IPV6 */ |
6d3dc07c | 1588 | |
e114e473 CS |
1589 | /** |
1590 | * smk_read_doi - read() for /smack/doi | |
1591 | * @filp: file pointer, not actually used | |
1592 | * @buf: where to put the result | |
1593 | * @count: maximum to send along | |
1594 | * @ppos: where to start | |
1595 | * | |
1596 | * Returns number of bytes read or error code, as appropriate | |
1597 | */ | |
1598 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1599 | size_t count, loff_t *ppos) | |
1600 | { | |
1601 | char temp[80]; | |
1602 | ssize_t rc; | |
1603 | ||
1604 | if (*ppos != 0) | |
1605 | return 0; | |
1606 | ||
1607 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1608 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1609 | ||
1610 | return rc; | |
1611 | } | |
1612 | ||
1613 | /** | |
1614 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1615 | * @file: file pointer, not actually used |
e114e473 CS |
1616 | * @buf: where to get the data from |
1617 | * @count: bytes sent | |
1618 | * @ppos: where to start | |
1619 | * | |
1620 | * Returns number of bytes written or error code, as appropriate | |
1621 | */ | |
1622 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1623 | size_t count, loff_t *ppos) | |
1624 | { | |
1625 | char temp[80]; | |
1626 | int i; | |
1627 | ||
1880eff7 | 1628 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1629 | return -EPERM; |
1630 | ||
1631 | if (count >= sizeof(temp) || count == 0) | |
1632 | return -EINVAL; | |
1633 | ||
1634 | if (copy_from_user(temp, buf, count) != 0) | |
1635 | return -EFAULT; | |
1636 | ||
1637 | temp[count] = '\0'; | |
1638 | ||
1639 | if (sscanf(temp, "%d", &i) != 1) | |
1640 | return -EINVAL; | |
1641 | ||
1642 | smk_cipso_doi_value = i; | |
1643 | ||
1644 | smk_cipso_doi(); | |
1645 | ||
1646 | return count; | |
1647 | } | |
1648 | ||
1649 | static const struct file_operations smk_doi_ops = { | |
1650 | .read = smk_read_doi, | |
1651 | .write = smk_write_doi, | |
6038f373 | 1652 | .llseek = default_llseek, |
e114e473 CS |
1653 | }; |
1654 | ||
1655 | /** | |
1656 | * smk_read_direct - read() for /smack/direct | |
1657 | * @filp: file pointer, not actually used | |
1658 | * @buf: where to put the result | |
1659 | * @count: maximum to send along | |
1660 | * @ppos: where to start | |
1661 | * | |
1662 | * Returns number of bytes read or error code, as appropriate | |
1663 | */ | |
1664 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1665 | size_t count, loff_t *ppos) | |
1666 | { | |
1667 | char temp[80]; | |
1668 | ssize_t rc; | |
1669 | ||
1670 | if (*ppos != 0) | |
1671 | return 0; | |
1672 | ||
1673 | sprintf(temp, "%d", smack_cipso_direct); | |
1674 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1675 | ||
1676 | return rc; | |
1677 | } | |
1678 | ||
1679 | /** | |
1680 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1681 | * @file: file pointer, not actually used |
e114e473 CS |
1682 | * @buf: where to get the data from |
1683 | * @count: bytes sent | |
1684 | * @ppos: where to start | |
1685 | * | |
1686 | * Returns number of bytes written or error code, as appropriate | |
1687 | */ | |
1688 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1689 | size_t count, loff_t *ppos) | |
1690 | { | |
f7112e6c | 1691 | struct smack_known *skp; |
e114e473 CS |
1692 | char temp[80]; |
1693 | int i; | |
1694 | ||
1880eff7 | 1695 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1696 | return -EPERM; |
1697 | ||
1698 | if (count >= sizeof(temp) || count == 0) | |
1699 | return -EINVAL; | |
1700 | ||
1701 | if (copy_from_user(temp, buf, count) != 0) | |
1702 | return -EFAULT; | |
1703 | ||
1704 | temp[count] = '\0'; | |
1705 | ||
1706 | if (sscanf(temp, "%d", &i) != 1) | |
1707 | return -EINVAL; | |
1708 | ||
f7112e6c CS |
1709 | /* |
1710 | * Don't do anything if the value hasn't actually changed. | |
1711 | * If it is changing reset the level on entries that were | |
1712 | * set up to be direct when they were created. | |
1713 | */ | |
1714 | if (smack_cipso_direct != i) { | |
1715 | mutex_lock(&smack_known_lock); | |
1716 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1717 | if (skp->smk_netlabel.attr.mls.lvl == | |
1718 | smack_cipso_direct) | |
1719 | skp->smk_netlabel.attr.mls.lvl = i; | |
1720 | smack_cipso_direct = i; | |
1721 | mutex_unlock(&smack_known_lock); | |
1722 | } | |
e114e473 CS |
1723 | |
1724 | return count; | |
1725 | } | |
1726 | ||
1727 | static const struct file_operations smk_direct_ops = { | |
1728 | .read = smk_read_direct, | |
1729 | .write = smk_write_direct, | |
6038f373 | 1730 | .llseek = default_llseek, |
e114e473 CS |
1731 | }; |
1732 | ||
f7112e6c CS |
1733 | /** |
1734 | * smk_read_mapped - read() for /smack/mapped | |
1735 | * @filp: file pointer, not actually used | |
1736 | * @buf: where to put the result | |
1737 | * @count: maximum to send along | |
1738 | * @ppos: where to start | |
1739 | * | |
1740 | * Returns number of bytes read or error code, as appropriate | |
1741 | */ | |
1742 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1743 | size_t count, loff_t *ppos) | |
1744 | { | |
1745 | char temp[80]; | |
1746 | ssize_t rc; | |
1747 | ||
1748 | if (*ppos != 0) | |
1749 | return 0; | |
1750 | ||
1751 | sprintf(temp, "%d", smack_cipso_mapped); | |
1752 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1753 | ||
1754 | return rc; | |
1755 | } | |
1756 | ||
1757 | /** | |
1758 | * smk_write_mapped - write() for /smack/mapped | |
1759 | * @file: file pointer, not actually used | |
1760 | * @buf: where to get the data from | |
1761 | * @count: bytes sent | |
1762 | * @ppos: where to start | |
1763 | * | |
1764 | * Returns number of bytes written or error code, as appropriate | |
1765 | */ | |
1766 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1767 | size_t count, loff_t *ppos) | |
1768 | { | |
1769 | struct smack_known *skp; | |
1770 | char temp[80]; | |
1771 | int i; | |
1772 | ||
1880eff7 | 1773 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1774 | return -EPERM; |
1775 | ||
1776 | if (count >= sizeof(temp) || count == 0) | |
1777 | return -EINVAL; | |
1778 | ||
1779 | if (copy_from_user(temp, buf, count) != 0) | |
1780 | return -EFAULT; | |
1781 | ||
1782 | temp[count] = '\0'; | |
1783 | ||
1784 | if (sscanf(temp, "%d", &i) != 1) | |
1785 | return -EINVAL; | |
1786 | ||
1787 | /* | |
1788 | * Don't do anything if the value hasn't actually changed. | |
1789 | * If it is changing reset the level on entries that were | |
1790 | * set up to be mapped when they were created. | |
1791 | */ | |
1792 | if (smack_cipso_mapped != i) { | |
1793 | mutex_lock(&smack_known_lock); | |
1794 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1795 | if (skp->smk_netlabel.attr.mls.lvl == | |
1796 | smack_cipso_mapped) | |
1797 | skp->smk_netlabel.attr.mls.lvl = i; | |
1798 | smack_cipso_mapped = i; | |
1799 | mutex_unlock(&smack_known_lock); | |
1800 | } | |
1801 | ||
1802 | return count; | |
1803 | } | |
1804 | ||
1805 | static const struct file_operations smk_mapped_ops = { | |
1806 | .read = smk_read_mapped, | |
1807 | .write = smk_write_mapped, | |
1808 | .llseek = default_llseek, | |
1809 | }; | |
1810 | ||
e114e473 CS |
1811 | /** |
1812 | * smk_read_ambient - read() for /smack/ambient | |
1813 | * @filp: file pointer, not actually used | |
1814 | * @buf: where to put the result | |
1815 | * @cn: maximum to send along | |
1816 | * @ppos: where to start | |
1817 | * | |
1818 | * Returns number of bytes read or error code, as appropriate | |
1819 | */ | |
1820 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1821 | size_t cn, loff_t *ppos) | |
1822 | { | |
1823 | ssize_t rc; | |
e114e473 CS |
1824 | int asize; |
1825 | ||
1826 | if (*ppos != 0) | |
1827 | return 0; | |
1828 | /* | |
1829 | * Being careful to avoid a problem in the case where | |
1830 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1831 | */ |
4bc87e62 | 1832 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1833 | |
2f823ff8 | 1834 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1835 | |
1836 | if (cn >= asize) | |
1837 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1838 | smack_net_ambient->smk_known, |
1839 | asize); | |
4bc87e62 CS |
1840 | else |
1841 | rc = -EINVAL; | |
e114e473 | 1842 | |
4bc87e62 | 1843 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1844 | |
1845 | return rc; | |
1846 | } | |
1847 | ||
1848 | /** | |
1849 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1850 | * @file: file pointer, not actually used |
e114e473 CS |
1851 | * @buf: where to get the data from |
1852 | * @count: bytes sent | |
1853 | * @ppos: where to start | |
1854 | * | |
1855 | * Returns number of bytes written or error code, as appropriate | |
1856 | */ | |
1857 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1858 | size_t count, loff_t *ppos) | |
1859 | { | |
2f823ff8 | 1860 | struct smack_known *skp; |
4bc87e62 | 1861 | char *oldambient; |
f7112e6c CS |
1862 | char *data; |
1863 | int rc = count; | |
e114e473 | 1864 | |
1880eff7 | 1865 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1866 | return -EPERM; |
1867 | ||
f7112e6c CS |
1868 | data = kzalloc(count + 1, GFP_KERNEL); |
1869 | if (data == NULL) | |
1870 | return -ENOMEM; | |
e114e473 | 1871 | |
f7112e6c CS |
1872 | if (copy_from_user(data, buf, count) != 0) { |
1873 | rc = -EFAULT; | |
1874 | goto out; | |
1875 | } | |
e114e473 | 1876 | |
2f823ff8 | 1877 | skp = smk_import_entry(data, count); |
e774ad68 LP |
1878 | if (IS_ERR(skp)) { |
1879 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1880 | goto out; |
1881 | } | |
e114e473 | 1882 | |
4bc87e62 CS |
1883 | mutex_lock(&smack_ambient_lock); |
1884 | ||
2f823ff8 CS |
1885 | oldambient = smack_net_ambient->smk_known; |
1886 | smack_net_ambient = skp; | |
4bc87e62 CS |
1887 | smk_unlbl_ambient(oldambient); |
1888 | ||
1889 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1890 | |
f7112e6c CS |
1891 | out: |
1892 | kfree(data); | |
1893 | return rc; | |
e114e473 CS |
1894 | } |
1895 | ||
1896 | static const struct file_operations smk_ambient_ops = { | |
1897 | .read = smk_read_ambient, | |
1898 | .write = smk_write_ambient, | |
6038f373 | 1899 | .llseek = default_llseek, |
e114e473 CS |
1900 | }; |
1901 | ||
c0d77c88 RK |
1902 | /* |
1903 | * Seq_file operations for /smack/onlycap | |
15446235 | 1904 | */ |
c0d77c88 | 1905 | static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
15446235 | 1906 | { |
c0d77c88 RK |
1907 | return smk_seq_start(s, pos, &smack_onlycap_list); |
1908 | } | |
15446235 | 1909 | |
c0d77c88 RK |
1910 | static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1911 | { | |
1912 | return smk_seq_next(s, v, pos, &smack_onlycap_list); | |
1913 | } | |
15446235 | 1914 | |
c0d77c88 RK |
1915 | static int onlycap_seq_show(struct seq_file *s, void *v) |
1916 | { | |
1917 | struct list_head *list = v; | |
38416e53 ZJ |
1918 | struct smack_known_list_elem *sklep = |
1919 | list_entry_rcu(list, struct smack_known_list_elem, list); | |
15446235 | 1920 | |
38416e53 | 1921 | seq_puts(s, sklep->smk_label->smk_known); |
c0d77c88 | 1922 | seq_putc(s, ' '); |
15446235 | 1923 | |
c0d77c88 RK |
1924 | return 0; |
1925 | } | |
15446235 | 1926 | |
c0d77c88 RK |
1927 | static const struct seq_operations onlycap_seq_ops = { |
1928 | .start = onlycap_seq_start, | |
1929 | .next = onlycap_seq_next, | |
1930 | .show = onlycap_seq_show, | |
1931 | .stop = smk_seq_stop, | |
1932 | }; | |
1933 | ||
1934 | static int smk_open_onlycap(struct inode *inode, struct file *file) | |
1935 | { | |
1936 | return seq_open(file, &onlycap_seq_ops); | |
1937 | } | |
1938 | ||
1939 | /** | |
1940 | * smk_list_swap_rcu - swap public list with a private one in RCU-safe way | |
1941 | * The caller must hold appropriate mutex to prevent concurrent modifications | |
1942 | * to the public list. | |
1943 | * Private list is assumed to be not accessible to other threads yet. | |
1944 | * | |
1945 | * @public: public list | |
1946 | * @private: private list | |
1947 | */ | |
1948 | static void smk_list_swap_rcu(struct list_head *public, | |
1949 | struct list_head *private) | |
1950 | { | |
1951 | struct list_head *first, *last; | |
1952 | ||
1953 | if (list_empty(public)) { | |
1954 | list_splice_init_rcu(private, public, synchronize_rcu); | |
1955 | } else { | |
1956 | /* Remember public list before replacing it */ | |
1957 | first = public->next; | |
1958 | last = public->prev; | |
1959 | ||
1960 | /* Publish private list in place of public in RCU-safe way */ | |
1961 | private->prev->next = public; | |
1962 | private->next->prev = public; | |
1963 | rcu_assign_pointer(public->next, private->next); | |
1964 | public->prev = private->prev; | |
1965 | ||
1966 | synchronize_rcu(); | |
1967 | ||
1968 | /* When all readers are done with the old public list, | |
1969 | * attach it in place of private */ | |
1970 | private->next = first; | |
1971 | private->prev = last; | |
1972 | first->prev = private; | |
1973 | last->next = private; | |
1974 | } | |
15446235 CS |
1975 | } |
1976 | ||
38416e53 ZJ |
1977 | /** |
1978 | * smk_parse_label_list - parse list of Smack labels, separated by spaces | |
1979 | * | |
1980 | * @data: the string to parse | |
1981 | * @private: destination list | |
1982 | * | |
1983 | * Returns zero on success or error code, as appropriate | |
1984 | */ | |
1985 | static int smk_parse_label_list(char *data, struct list_head *list) | |
1986 | { | |
1987 | char *tok; | |
1988 | struct smack_known *skp; | |
1989 | struct smack_known_list_elem *sklep; | |
1990 | ||
1991 | while ((tok = strsep(&data, " ")) != NULL) { | |
1992 | if (!*tok) | |
1993 | continue; | |
1994 | ||
1995 | skp = smk_import_entry(tok, 0); | |
1996 | if (IS_ERR(skp)) | |
1997 | return PTR_ERR(skp); | |
1998 | ||
1999 | sklep = kzalloc(sizeof(*sklep), GFP_KERNEL); | |
2000 | if (sklep == NULL) | |
2001 | return -ENOMEM; | |
2002 | ||
2003 | sklep->smk_label = skp; | |
2004 | list_add(&sklep->list, list); | |
2005 | } | |
2006 | ||
2007 | return 0; | |
2008 | } | |
2009 | ||
2010 | /** | |
2011 | * smk_destroy_label_list - destroy a list of smack_known_list_elem | |
2012 | * @head: header pointer of the list to destroy | |
2013 | */ | |
2014 | void smk_destroy_label_list(struct list_head *list) | |
2015 | { | |
2016 | struct smack_known_list_elem *sklep; | |
2017 | struct smack_known_list_elem *sklep2; | |
2018 | ||
2019 | list_for_each_entry_safe(sklep, sklep2, list, list) | |
2020 | kfree(sklep); | |
2021 | ||
2022 | INIT_LIST_HEAD(list); | |
2023 | } | |
2024 | ||
15446235 | 2025 | /** |
00f84f3f | 2026 | * smk_write_onlycap - write() for smackfs/onlycap |
251a2a95 | 2027 | * @file: file pointer, not actually used |
15446235 CS |
2028 | * @buf: where to get the data from |
2029 | * @count: bytes sent | |
2030 | * @ppos: where to start | |
2031 | * | |
2032 | * Returns number of bytes written or error code, as appropriate | |
2033 | */ | |
2034 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
2035 | size_t count, loff_t *ppos) | |
2036 | { | |
f7112e6c | 2037 | char *data; |
c0d77c88 | 2038 | LIST_HEAD(list_tmp); |
38416e53 | 2039 | int rc; |
15446235 | 2040 | |
1880eff7 | 2041 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
2042 | return -EPERM; |
2043 | ||
b862e561 | 2044 | data = kzalloc(count + 1, GFP_KERNEL); |
f7112e6c CS |
2045 | if (data == NULL) |
2046 | return -ENOMEM; | |
15446235 | 2047 | |
e774ad68 | 2048 | if (copy_from_user(data, buf, count) != 0) { |
c0d77c88 RK |
2049 | kfree(data); |
2050 | return -EFAULT; | |
e774ad68 LP |
2051 | } |
2052 | ||
38416e53 | 2053 | rc = smk_parse_label_list(data, &list_tmp); |
c0d77c88 RK |
2054 | kfree(data); |
2055 | ||
15446235 | 2056 | /* |
e774ad68 LP |
2057 | * Clear the smack_onlycap on invalid label errors. This means |
2058 | * that we can pass a null string to unset the onlycap value. | |
f7112e6c | 2059 | * |
e774ad68 | 2060 | * Importing will also reject a label beginning with '-', |
f7112e6c | 2061 | * so "-usecapabilities" will also work. |
e774ad68 LP |
2062 | * |
2063 | * But do so only on invalid label, not on system errors. | |
c0d77c88 | 2064 | * The invalid label must be first to count as clearing attempt. |
15446235 | 2065 | */ |
38416e53 | 2066 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { |
c0d77c88 RK |
2067 | mutex_lock(&smack_onlycap_lock); |
2068 | smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); | |
2069 | mutex_unlock(&smack_onlycap_lock); | |
38416e53 | 2070 | rc = count; |
e774ad68 LP |
2071 | } |
2072 | ||
38416e53 | 2073 | smk_destroy_label_list(&list_tmp); |
15446235 | 2074 | |
f7112e6c | 2075 | return rc; |
15446235 CS |
2076 | } |
2077 | ||
2078 | static const struct file_operations smk_onlycap_ops = { | |
c0d77c88 RK |
2079 | .open = smk_open_onlycap, |
2080 | .read = seq_read, | |
15446235 | 2081 | .write = smk_write_onlycap, |
c0d77c88 RK |
2082 | .llseek = seq_lseek, |
2083 | .release = seq_release, | |
15446235 CS |
2084 | }; |
2085 | ||
bf4b2fee CS |
2086 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2087 | /** | |
2088 | * smk_read_unconfined - read() for smackfs/unconfined | |
2089 | * @filp: file pointer, not actually used | |
2090 | * @buf: where to put the result | |
2091 | * @cn: maximum to send along | |
2092 | * @ppos: where to start | |
2093 | * | |
2094 | * Returns number of bytes read or error code, as appropriate | |
2095 | */ | |
2096 | static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, | |
2097 | size_t cn, loff_t *ppos) | |
2098 | { | |
2099 | char *smack = ""; | |
2100 | ssize_t rc = -EINVAL; | |
2101 | int asize; | |
2102 | ||
2103 | if (*ppos != 0) | |
2104 | return 0; | |
2105 | ||
2106 | if (smack_unconfined != NULL) | |
2107 | smack = smack_unconfined->smk_known; | |
2108 | ||
2109 | asize = strlen(smack) + 1; | |
2110 | ||
2111 | if (cn >= asize) | |
2112 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
2113 | ||
2114 | return rc; | |
2115 | } | |
2116 | ||
2117 | /** | |
2118 | * smk_write_unconfined - write() for smackfs/unconfined | |
2119 | * @file: file pointer, not actually used | |
2120 | * @buf: where to get the data from | |
2121 | * @count: bytes sent | |
2122 | * @ppos: where to start | |
2123 | * | |
2124 | * Returns number of bytes written or error code, as appropriate | |
2125 | */ | |
2126 | static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, | |
2127 | size_t count, loff_t *ppos) | |
2128 | { | |
2129 | char *data; | |
e774ad68 | 2130 | struct smack_known *skp; |
bf4b2fee CS |
2131 | int rc = count; |
2132 | ||
2133 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2134 | return -EPERM; | |
2135 | ||
2136 | data = kzalloc(count + 1, GFP_KERNEL); | |
2137 | if (data == NULL) | |
2138 | return -ENOMEM; | |
2139 | ||
e774ad68 LP |
2140 | if (copy_from_user(data, buf, count) != 0) { |
2141 | rc = -EFAULT; | |
2142 | goto freeout; | |
2143 | } | |
2144 | ||
bf4b2fee | 2145 | /* |
e774ad68 LP |
2146 | * Clear the smack_unconfined on invalid label errors. This means |
2147 | * that we can pass a null string to unset the unconfined value. | |
bf4b2fee | 2148 | * |
e774ad68 | 2149 | * Importing will also reject a label beginning with '-', |
bf4b2fee | 2150 | * so "-confine" will also work. |
e774ad68 LP |
2151 | * |
2152 | * But do so only on invalid label, not on system errors. | |
bf4b2fee | 2153 | */ |
e774ad68 LP |
2154 | skp = smk_import_entry(data, count); |
2155 | if (PTR_ERR(skp) == -EINVAL) | |
2156 | skp = NULL; | |
2157 | else if (IS_ERR(skp)) { | |
2158 | rc = PTR_ERR(skp); | |
2159 | goto freeout; | |
2160 | } | |
2161 | ||
2162 | smack_unconfined = skp; | |
bf4b2fee | 2163 | |
e774ad68 | 2164 | freeout: |
bf4b2fee CS |
2165 | kfree(data); |
2166 | return rc; | |
2167 | } | |
2168 | ||
2169 | static const struct file_operations smk_unconfined_ops = { | |
2170 | .read = smk_read_unconfined, | |
2171 | .write = smk_write_unconfined, | |
2172 | .llseek = default_llseek, | |
2173 | }; | |
2174 | #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ | |
2175 | ||
ecfcc53f EB |
2176 | /** |
2177 | * smk_read_logging - read() for /smack/logging | |
2178 | * @filp: file pointer, not actually used | |
2179 | * @buf: where to put the result | |
2180 | * @cn: maximum to send along | |
2181 | * @ppos: where to start | |
2182 | * | |
2183 | * Returns number of bytes read or error code, as appropriate | |
2184 | */ | |
2185 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
2186 | size_t count, loff_t *ppos) | |
2187 | { | |
2188 | char temp[32]; | |
2189 | ssize_t rc; | |
2190 | ||
2191 | if (*ppos != 0) | |
2192 | return 0; | |
2193 | ||
2194 | sprintf(temp, "%d\n", log_policy); | |
2195 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2196 | return rc; | |
2197 | } | |
2198 | ||
2199 | /** | |
2200 | * smk_write_logging - write() for /smack/logging | |
2201 | * @file: file pointer, not actually used | |
2202 | * @buf: where to get the data from | |
2203 | * @count: bytes sent | |
2204 | * @ppos: where to start | |
2205 | * | |
2206 | * Returns number of bytes written or error code, as appropriate | |
2207 | */ | |
2208 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
2209 | size_t count, loff_t *ppos) | |
2210 | { | |
2211 | char temp[32]; | |
2212 | int i; | |
2213 | ||
1880eff7 | 2214 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
2215 | return -EPERM; |
2216 | ||
2217 | if (count >= sizeof(temp) || count == 0) | |
2218 | return -EINVAL; | |
2219 | ||
2220 | if (copy_from_user(temp, buf, count) != 0) | |
2221 | return -EFAULT; | |
2222 | ||
2223 | temp[count] = '\0'; | |
2224 | ||
2225 | if (sscanf(temp, "%d", &i) != 1) | |
2226 | return -EINVAL; | |
2227 | if (i < 0 || i > 3) | |
2228 | return -EINVAL; | |
2229 | log_policy = i; | |
2230 | return count; | |
2231 | } | |
2232 | ||
2233 | ||
2234 | ||
2235 | static const struct file_operations smk_logging_ops = { | |
2236 | .read = smk_read_logging, | |
2237 | .write = smk_write_logging, | |
6038f373 | 2238 | .llseek = default_llseek, |
ecfcc53f | 2239 | }; |
7898e1f8 CS |
2240 | |
2241 | /* | |
2242 | * Seq_file read operations for /smack/load-self | |
2243 | */ | |
2244 | ||
2245 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
2246 | { | |
2247 | struct task_smack *tsp = current_security(); | |
2248 | ||
40809565 | 2249 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
2250 | } |
2251 | ||
2252 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2253 | { | |
2254 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 2255 | |
40809565 | 2256 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
2257 | } |
2258 | ||
2259 | static int load_self_seq_show(struct seq_file *s, void *v) | |
2260 | { | |
2261 | struct list_head *list = v; | |
2262 | struct smack_rule *srp = | |
01fa8474 | 2263 | list_entry_rcu(list, struct smack_rule, list); |
7898e1f8 | 2264 | |
f7112e6c | 2265 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
2266 | |
2267 | return 0; | |
2268 | } | |
2269 | ||
7898e1f8 CS |
2270 | static const struct seq_operations load_self_seq_ops = { |
2271 | .start = load_self_seq_start, | |
2272 | .next = load_self_seq_next, | |
2273 | .show = load_self_seq_show, | |
40809565 | 2274 | .stop = smk_seq_stop, |
7898e1f8 CS |
2275 | }; |
2276 | ||
2277 | ||
2278 | /** | |
f7112e6c | 2279 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
2280 | * @inode: inode structure representing file |
2281 | * @file: "load" file pointer | |
2282 | * | |
2283 | * For reading, use load_seq_* seq_file reading operations. | |
2284 | */ | |
2285 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
2286 | { | |
2287 | return seq_open(file, &load_self_seq_ops); | |
2288 | } | |
2289 | ||
2290 | /** | |
2291 | * smk_write_load_self - write() for /smack/load-self | |
2292 | * @file: file pointer, not actually used | |
2293 | * @buf: where to get the data from | |
2294 | * @count: bytes sent | |
2295 | * @ppos: where to start - must be 0 | |
2296 | * | |
2297 | */ | |
2298 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
2299 | size_t count, loff_t *ppos) | |
2300 | { | |
2301 | struct task_smack *tsp = current_security(); | |
2302 | ||
f7112e6c CS |
2303 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
2304 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
2305 | } |
2306 | ||
2307 | static const struct file_operations smk_load_self_ops = { | |
2308 | .open = smk_open_load_self, | |
2309 | .read = seq_read, | |
2310 | .llseek = seq_lseek, | |
2311 | .write = smk_write_load_self, | |
2312 | .release = seq_release, | |
2313 | }; | |
828716c2 JS |
2314 | |
2315 | /** | |
f7112e6c | 2316 | * smk_user_access - handle access check transaction |
828716c2 JS |
2317 | * @file: file pointer |
2318 | * @buf: data from user space | |
2319 | * @count: bytes sent | |
2320 | * @ppos: where to start - must be 0 | |
2321 | */ | |
f7112e6c CS |
2322 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
2323 | size_t count, loff_t *ppos, int format) | |
828716c2 | 2324 | { |
e05b6f98 | 2325 | struct smack_parsed_rule rule; |
828716c2 | 2326 | char *data; |
f8859d98 | 2327 | int res; |
828716c2 | 2328 | |
828716c2 JS |
2329 | data = simple_transaction_get(file, buf, count); |
2330 | if (IS_ERR(data)) | |
2331 | return PTR_ERR(data); | |
2332 | ||
f7112e6c CS |
2333 | if (format == SMK_FIXED24_FMT) { |
2334 | if (count < SMK_LOADLEN) | |
2335 | return -EINVAL; | |
2336 | res = smk_parse_rule(data, &rule, 0); | |
2337 | } else { | |
2338 | /* | |
10289b0f | 2339 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 2340 | */ |
10289b0f | 2341 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
2342 | } |
2343 | ||
398ce073 JS |
2344 | if (res >= 0) |
2345 | res = smk_access(rule.smk_subject, rule.smk_object, | |
2346 | rule.smk_access1, NULL); | |
2347 | else if (res != -ENOENT) | |
e774ad68 | 2348 | return res; |
828716c2 | 2349 | |
d166c802 CS |
2350 | /* |
2351 | * smk_access() can return a value > 0 in the "bringup" case. | |
2352 | */ | |
2353 | data[0] = res >= 0 ? '1' : '0'; | |
f8859d98 | 2354 | data[1] = '\0'; |
828716c2 | 2355 | |
d86b2b61 | 2356 | simple_transaction_set(file, 2); |
f7112e6c CS |
2357 | |
2358 | if (format == SMK_FIXED24_FMT) | |
2359 | return SMK_LOADLEN; | |
2360 | return count; | |
2361 | } | |
2362 | ||
2363 | /** | |
2364 | * smk_write_access - handle access check transaction | |
2365 | * @file: file pointer | |
2366 | * @buf: data from user space | |
2367 | * @count: bytes sent | |
2368 | * @ppos: where to start - must be 0 | |
2369 | */ | |
2370 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
2371 | size_t count, loff_t *ppos) | |
2372 | { | |
2373 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
2374 | } |
2375 | ||
2376 | static const struct file_operations smk_access_ops = { | |
2377 | .write = smk_write_access, | |
2378 | .read = simple_transaction_read, | |
2379 | .release = simple_transaction_release, | |
2380 | .llseek = generic_file_llseek, | |
2381 | }; | |
2382 | ||
f7112e6c CS |
2383 | |
2384 | /* | |
2385 | * Seq_file read operations for /smack/load2 | |
2386 | */ | |
2387 | ||
2388 | static int load2_seq_show(struct seq_file *s, void *v) | |
2389 | { | |
2390 | struct list_head *list = v; | |
2391 | struct smack_master_list *smlp = | |
01fa8474 | 2392 | list_entry_rcu(list, struct smack_master_list, list); |
f7112e6c CS |
2393 | |
2394 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
2395 | ||
2396 | return 0; | |
2397 | } | |
2398 | ||
2399 | static const struct seq_operations load2_seq_ops = { | |
2400 | .start = load2_seq_start, | |
2401 | .next = load2_seq_next, | |
2402 | .show = load2_seq_show, | |
2403 | .stop = smk_seq_stop, | |
2404 | }; | |
2405 | ||
2406 | /** | |
2407 | * smk_open_load2 - open() for /smack/load2 | |
2408 | * @inode: inode structure representing file | |
2409 | * @file: "load2" file pointer | |
2410 | * | |
2411 | * For reading, use load2_seq_* seq_file reading operations. | |
2412 | */ | |
2413 | static int smk_open_load2(struct inode *inode, struct file *file) | |
2414 | { | |
2415 | return seq_open(file, &load2_seq_ops); | |
2416 | } | |
2417 | ||
2418 | /** | |
2419 | * smk_write_load2 - write() for /smack/load2 | |
2420 | * @file: file pointer, not actually used | |
2421 | * @buf: where to get the data from | |
2422 | * @count: bytes sent | |
2423 | * @ppos: where to start - must be 0 | |
2424 | * | |
2425 | */ | |
2426 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
2427 | size_t count, loff_t *ppos) | |
2428 | { | |
2429 | /* | |
2430 | * Must have privilege. | |
2431 | */ | |
1880eff7 | 2432 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
2433 | return -EPERM; |
2434 | ||
2435 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2436 | SMK_LONG_FMT); | |
2437 | } | |
2438 | ||
2439 | static const struct file_operations smk_load2_ops = { | |
2440 | .open = smk_open_load2, | |
2441 | .read = seq_read, | |
2442 | .llseek = seq_lseek, | |
2443 | .write = smk_write_load2, | |
2444 | .release = seq_release, | |
2445 | }; | |
2446 | ||
2447 | /* | |
2448 | * Seq_file read operations for /smack/load-self2 | |
2449 | */ | |
2450 | ||
2451 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
2452 | { | |
2453 | struct task_smack *tsp = current_security(); | |
2454 | ||
2455 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
2456 | } | |
2457 | ||
2458 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2459 | { | |
2460 | struct task_smack *tsp = current_security(); | |
2461 | ||
2462 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
2463 | } | |
2464 | ||
2465 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
2466 | { | |
2467 | struct list_head *list = v; | |
2468 | struct smack_rule *srp = | |
01fa8474 | 2469 | list_entry_rcu(list, struct smack_rule, list); |
f7112e6c CS |
2470 | |
2471 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
2472 | ||
2473 | return 0; | |
2474 | } | |
2475 | ||
2476 | static const struct seq_operations load_self2_seq_ops = { | |
2477 | .start = load_self2_seq_start, | |
2478 | .next = load_self2_seq_next, | |
2479 | .show = load_self2_seq_show, | |
2480 | .stop = smk_seq_stop, | |
2481 | }; | |
2482 | ||
2483 | /** | |
2484 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2485 | * @inode: inode structure representing file | |
2486 | * @file: "load" file pointer | |
2487 | * | |
2488 | * For reading, use load_seq_* seq_file reading operations. | |
2489 | */ | |
2490 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2491 | { | |
2492 | return seq_open(file, &load_self2_seq_ops); | |
2493 | } | |
2494 | ||
2495 | /** | |
2496 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2497 | * @file: file pointer, not actually used | |
2498 | * @buf: where to get the data from | |
2499 | * @count: bytes sent | |
2500 | * @ppos: where to start - must be 0 | |
2501 | * | |
2502 | */ | |
2503 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2504 | size_t count, loff_t *ppos) | |
2505 | { | |
2506 | struct task_smack *tsp = current_security(); | |
2507 | ||
2508 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2509 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2510 | } | |
2511 | ||
2512 | static const struct file_operations smk_load_self2_ops = { | |
2513 | .open = smk_open_load_self2, | |
2514 | .read = seq_read, | |
2515 | .llseek = seq_lseek, | |
2516 | .write = smk_write_load_self2, | |
2517 | .release = seq_release, | |
2518 | }; | |
2519 | ||
2520 | /** | |
2521 | * smk_write_access2 - handle access check transaction | |
2522 | * @file: file pointer | |
2523 | * @buf: data from user space | |
2524 | * @count: bytes sent | |
2525 | * @ppos: where to start - must be 0 | |
2526 | */ | |
2527 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2528 | size_t count, loff_t *ppos) | |
2529 | { | |
2530 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2531 | } | |
2532 | ||
2533 | static const struct file_operations smk_access2_ops = { | |
2534 | .write = smk_write_access2, | |
2535 | .read = simple_transaction_read, | |
2536 | .release = simple_transaction_release, | |
2537 | .llseek = generic_file_llseek, | |
2538 | }; | |
2539 | ||
449543b0 RK |
2540 | /** |
2541 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2542 | * @file: file pointer | |
2543 | * @buf: data from user space | |
2544 | * @count: bytes sent | |
2545 | * @ppos: where to start - must be 0 | |
2546 | */ | |
2547 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2548 | size_t count, loff_t *ppos) | |
2549 | { | |
54302094 DC |
2550 | char *data; |
2551 | const char *cp; | |
449543b0 RK |
2552 | struct smack_known *skp; |
2553 | struct smack_rule *sp; | |
2554 | struct list_head *rule_list; | |
2555 | struct mutex *rule_lock; | |
2556 | int rc = count; | |
2557 | ||
2558 | if (*ppos != 0) | |
2559 | return -EINVAL; | |
2560 | ||
2561 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2562 | return -EPERM; | |
2563 | ||
2564 | if (count == 0 || count > SMK_LONGLABEL) | |
2565 | return -EINVAL; | |
2566 | ||
2567 | data = kzalloc(count, GFP_KERNEL); | |
2568 | if (data == NULL) | |
2569 | return -ENOMEM; | |
2570 | ||
2571 | if (copy_from_user(data, buf, count) != 0) { | |
2572 | rc = -EFAULT; | |
54302094 | 2573 | goto out_data; |
449543b0 RK |
2574 | } |
2575 | ||
2576 | cp = smk_parse_smack(data, count); | |
e774ad68 LP |
2577 | if (IS_ERR(cp)) { |
2578 | rc = PTR_ERR(cp); | |
54302094 | 2579 | goto out_data; |
449543b0 RK |
2580 | } |
2581 | ||
2582 | skp = smk_find_entry(cp); | |
d15d9fad | 2583 | if (skp == NULL) |
54302094 | 2584 | goto out_cp; |
449543b0 RK |
2585 | |
2586 | rule_list = &skp->smk_rules; | |
2587 | rule_lock = &skp->smk_rules_lock; | |
2588 | ||
2589 | mutex_lock(rule_lock); | |
2590 | ||
2591 | list_for_each_entry_rcu(sp, rule_list, list) | |
2592 | sp->smk_access = 0; | |
2593 | ||
2594 | mutex_unlock(rule_lock); | |
2595 | ||
54302094 | 2596 | out_cp: |
449543b0 | 2597 | kfree(cp); |
54302094 DC |
2598 | out_data: |
2599 | kfree(data); | |
2600 | ||
449543b0 RK |
2601 | return rc; |
2602 | } | |
2603 | ||
2604 | static const struct file_operations smk_revoke_subj_ops = { | |
2605 | .write = smk_write_revoke_subj, | |
2606 | .read = simple_transaction_read, | |
2607 | .release = simple_transaction_release, | |
2608 | .llseek = generic_file_llseek, | |
2609 | }; | |
2610 | ||
e9307237 CS |
2611 | /** |
2612 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2613 | * | |
2614 | */ | |
2615 | static int smk_init_sysfs(void) | |
2616 | { | |
ca70d27e | 2617 | return sysfs_create_mount_point(fs_kobj, "smackfs"); |
e9307237 CS |
2618 | } |
2619 | ||
e05b6f98 RK |
2620 | /** |
2621 | * smk_write_change_rule - write() for /smack/change-rule | |
2622 | * @file: file pointer | |
2623 | * @buf: data from user space | |
2624 | * @count: bytes sent | |
2625 | * @ppos: where to start - must be 0 | |
2626 | */ | |
2627 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2628 | size_t count, loff_t *ppos) | |
2629 | { | |
2630 | /* | |
2631 | * Must have privilege. | |
2632 | */ | |
4afde48b | 2633 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e05b6f98 RK |
2634 | return -EPERM; |
2635 | ||
2636 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2637 | SMK_CHANGE_FMT); | |
2638 | } | |
2639 | ||
2640 | static const struct file_operations smk_change_rule_ops = { | |
2641 | .write = smk_write_change_rule, | |
2642 | .read = simple_transaction_read, | |
2643 | .release = simple_transaction_release, | |
2644 | .llseek = generic_file_llseek, | |
2645 | }; | |
2646 | ||
e114e473 | 2647 | /** |
00f84f3f CS |
2648 | * smk_read_syslog - read() for smackfs/syslog |
2649 | * @filp: file pointer, not actually used | |
2650 | * @buf: where to put the result | |
2651 | * @cn: maximum to send along | |
2652 | * @ppos: where to start | |
2653 | * | |
2654 | * Returns number of bytes read or error code, as appropriate | |
2655 | */ | |
2656 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, | |
2657 | size_t cn, loff_t *ppos) | |
2658 | { | |
2659 | struct smack_known *skp; | |
2660 | ssize_t rc = -EINVAL; | |
2661 | int asize; | |
2662 | ||
2663 | if (*ppos != 0) | |
2664 | return 0; | |
2665 | ||
2666 | if (smack_syslog_label == NULL) | |
2667 | skp = &smack_known_star; | |
2668 | else | |
2669 | skp = smack_syslog_label; | |
2670 | ||
2671 | asize = strlen(skp->smk_known) + 1; | |
2672 | ||
2673 | if (cn >= asize) | |
2674 | rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, | |
2675 | asize); | |
2676 | ||
2677 | return rc; | |
2678 | } | |
2679 | ||
2680 | /** | |
2681 | * smk_write_syslog - write() for smackfs/syslog | |
2682 | * @file: file pointer, not actually used | |
2683 | * @buf: where to get the data from | |
2684 | * @count: bytes sent | |
2685 | * @ppos: where to start | |
2686 | * | |
2687 | * Returns number of bytes written or error code, as appropriate | |
2688 | */ | |
2689 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, | |
2690 | size_t count, loff_t *ppos) | |
2691 | { | |
2692 | char *data; | |
2693 | struct smack_known *skp; | |
2694 | int rc = count; | |
2695 | ||
2696 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2697 | return -EPERM; | |
2698 | ||
b862e561 | 2699 | data = kzalloc(count + 1, GFP_KERNEL); |
00f84f3f CS |
2700 | if (data == NULL) |
2701 | return -ENOMEM; | |
2702 | ||
2703 | if (copy_from_user(data, buf, count) != 0) | |
2704 | rc = -EFAULT; | |
2705 | else { | |
2706 | skp = smk_import_entry(data, count); | |
e774ad68 LP |
2707 | if (IS_ERR(skp)) |
2708 | rc = PTR_ERR(skp); | |
00f84f3f | 2709 | else |
e774ad68 | 2710 | smack_syslog_label = skp; |
00f84f3f CS |
2711 | } |
2712 | ||
2713 | kfree(data); | |
2714 | return rc; | |
2715 | } | |
2716 | ||
2717 | static const struct file_operations smk_syslog_ops = { | |
2718 | .read = smk_read_syslog, | |
2719 | .write = smk_write_syslog, | |
2720 | .llseek = default_llseek, | |
2721 | }; | |
2722 | ||
38416e53 ZJ |
2723 | /* |
2724 | * Seq_file read operations for /smack/relabel-self | |
2725 | */ | |
2726 | ||
2727 | static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos) | |
2728 | { | |
2729 | struct task_smack *tsp = current_security(); | |
2730 | ||
2731 | return smk_seq_start(s, pos, &tsp->smk_relabel); | |
2732 | } | |
2733 | ||
2734 | static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2735 | { | |
2736 | struct task_smack *tsp = current_security(); | |
2737 | ||
2738 | return smk_seq_next(s, v, pos, &tsp->smk_relabel); | |
2739 | } | |
2740 | ||
2741 | static int relabel_self_seq_show(struct seq_file *s, void *v) | |
2742 | { | |
2743 | struct list_head *list = v; | |
2744 | struct smack_known_list_elem *sklep = | |
2745 | list_entry(list, struct smack_known_list_elem, list); | |
2746 | ||
2747 | seq_puts(s, sklep->smk_label->smk_known); | |
2748 | seq_putc(s, ' '); | |
2749 | ||
2750 | return 0; | |
2751 | } | |
2752 | ||
2753 | static const struct seq_operations relabel_self_seq_ops = { | |
2754 | .start = relabel_self_seq_start, | |
2755 | .next = relabel_self_seq_next, | |
2756 | .show = relabel_self_seq_show, | |
2757 | .stop = smk_seq_stop, | |
2758 | }; | |
2759 | ||
2760 | /** | |
2761 | * smk_open_relabel_self - open() for /smack/relabel-self | |
2762 | * @inode: inode structure representing file | |
2763 | * @file: "relabel-self" file pointer | |
2764 | * | |
2765 | * Connect our relabel_self_seq_* operations with /smack/relabel-self | |
2766 | * file_operations | |
2767 | */ | |
2768 | static int smk_open_relabel_self(struct inode *inode, struct file *file) | |
2769 | { | |
2770 | return seq_open(file, &relabel_self_seq_ops); | |
2771 | } | |
2772 | ||
2773 | /** | |
2774 | * smk_write_relabel_self - write() for /smack/relabel-self | |
2775 | * @file: file pointer, not actually used | |
2776 | * @buf: where to get the data from | |
2777 | * @count: bytes sent | |
2778 | * @ppos: where to start - must be 0 | |
2779 | * | |
2780 | */ | |
2781 | static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, | |
2782 | size_t count, loff_t *ppos) | |
2783 | { | |
2784 | struct task_smack *tsp = current_security(); | |
2785 | char *data; | |
2786 | int rc; | |
2787 | LIST_HEAD(list_tmp); | |
2788 | ||
2789 | /* | |
2790 | * Must have privilege. | |
2791 | */ | |
2792 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2793 | return -EPERM; | |
2794 | ||
2795 | /* | |
2796 | * Enough data must be present. | |
2797 | */ | |
2798 | if (*ppos != 0) | |
2799 | return -EINVAL; | |
2800 | ||
2801 | data = kzalloc(count + 1, GFP_KERNEL); | |
2802 | if (data == NULL) | |
2803 | return -ENOMEM; | |
2804 | ||
2805 | if (copy_from_user(data, buf, count) != 0) { | |
2806 | kfree(data); | |
2807 | return -EFAULT; | |
2808 | } | |
2809 | ||
2810 | rc = smk_parse_label_list(data, &list_tmp); | |
2811 | kfree(data); | |
2812 | ||
2813 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { | |
2814 | smk_destroy_label_list(&tsp->smk_relabel); | |
2815 | list_splice(&list_tmp, &tsp->smk_relabel); | |
2816 | return count; | |
2817 | } | |
2818 | ||
2819 | smk_destroy_label_list(&list_tmp); | |
2820 | return rc; | |
2821 | } | |
2822 | ||
2823 | static const struct file_operations smk_relabel_self_ops = { | |
2824 | .open = smk_open_relabel_self, | |
2825 | .read = seq_read, | |
2826 | .llseek = seq_lseek, | |
2827 | .write = smk_write_relabel_self, | |
2828 | .release = seq_release, | |
2829 | }; | |
00f84f3f | 2830 | |
66867818 LP |
2831 | /** |
2832 | * smk_read_ptrace - read() for /smack/ptrace | |
2833 | * @filp: file pointer, not actually used | |
2834 | * @buf: where to put the result | |
2835 | * @count: maximum to send along | |
2836 | * @ppos: where to start | |
2837 | * | |
2838 | * Returns number of bytes read or error code, as appropriate | |
2839 | */ | |
2840 | static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, | |
2841 | size_t count, loff_t *ppos) | |
2842 | { | |
2843 | char temp[32]; | |
2844 | ssize_t rc; | |
2845 | ||
2846 | if (*ppos != 0) | |
2847 | return 0; | |
2848 | ||
2849 | sprintf(temp, "%d\n", smack_ptrace_rule); | |
2850 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2851 | return rc; | |
2852 | } | |
2853 | ||
2854 | /** | |
2855 | * smk_write_ptrace - write() for /smack/ptrace | |
2856 | * @file: file pointer | |
2857 | * @buf: data from user space | |
2858 | * @count: bytes sent | |
2859 | * @ppos: where to start - must be 0 | |
2860 | */ | |
2861 | static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, | |
2862 | size_t count, loff_t *ppos) | |
2863 | { | |
2864 | char temp[32]; | |
2865 | int i; | |
2866 | ||
2867 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2868 | return -EPERM; | |
2869 | ||
2870 | if (*ppos != 0 || count >= sizeof(temp) || count == 0) | |
2871 | return -EINVAL; | |
2872 | ||
2873 | if (copy_from_user(temp, buf, count) != 0) | |
2874 | return -EFAULT; | |
2875 | ||
2876 | temp[count] = '\0'; | |
2877 | ||
2878 | if (sscanf(temp, "%d", &i) != 1) | |
2879 | return -EINVAL; | |
2880 | if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) | |
2881 | return -EINVAL; | |
2882 | smack_ptrace_rule = i; | |
2883 | ||
2884 | return count; | |
2885 | } | |
2886 | ||
2887 | static const struct file_operations smk_ptrace_ops = { | |
2888 | .write = smk_write_ptrace, | |
2889 | .read = smk_read_ptrace, | |
2890 | .llseek = default_llseek, | |
2891 | }; | |
2892 | ||
00f84f3f CS |
2893 | /** |
2894 | * smk_fill_super - fill the smackfs superblock | |
e114e473 CS |
2895 | * @sb: the empty superblock |
2896 | * @data: unused | |
2897 | * @silent: unused | |
2898 | * | |
00f84f3f | 2899 | * Fill in the well known entries for the smack filesystem |
e114e473 CS |
2900 | * |
2901 | * Returns 0 on success, an error code on failure | |
2902 | */ | |
2903 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2904 | { | |
2905 | int rc; | |
2906 | struct inode *root_inode; | |
2907 | ||
2908 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
2909 | [SMK_LOAD] = { |
2910 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2911 | [SMK_CIPSO] = { | |
2912 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2913 | [SMK_DOI] = { | |
2914 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2915 | [SMK_DIRECT] = { | |
2916 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2917 | [SMK_AMBIENT] = { | |
2918 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
21abb1ec CS |
2919 | [SMK_NET4ADDR] = { |
2920 | "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2921 | [SMK_ONLYCAP] = { |
2922 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2923 | [SMK_LOGGING] = { | |
2924 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2925 | [SMK_LOAD_SELF] = { | |
2926 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2927 | [SMK_ACCESSES] = { |
0e94ae17 | 2928 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2929 | [SMK_MAPPED] = { |
2930 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2931 | [SMK_LOAD2] = { | |
2932 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2933 | [SMK_LOAD_SELF2] = { | |
2934 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2935 | [SMK_ACCESS2] = { | |
2936 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2937 | [SMK_CIPSO2] = { | |
2938 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2939 | [SMK_REVOKE_SUBJ] = { |
2940 | "revoke-subject", &smk_revoke_subj_ops, | |
2941 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2942 | [SMK_CHANGE_RULE] = { |
2943 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
00f84f3f CS |
2944 | [SMK_SYSLOG] = { |
2945 | "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, | |
66867818 LP |
2946 | [SMK_PTRACE] = { |
2947 | "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, | |
bf4b2fee CS |
2948 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2949 | [SMK_UNCONFINED] = { | |
2950 | "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, | |
2951 | #endif | |
21abb1ec CS |
2952 | #if IS_ENABLED(CONFIG_IPV6) |
2953 | [SMK_NET6ADDR] = { | |
2954 | "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR}, | |
2955 | #endif /* CONFIG_IPV6 */ | |
38416e53 ZJ |
2956 | [SMK_RELABEL_SELF] = { |
2957 | "relabel-self", &smk_relabel_self_ops, | |
2958 | S_IRUGO|S_IWUGO}, | |
7898e1f8 CS |
2959 | /* last one */ |
2960 | {""} | |
e114e473 CS |
2961 | }; |
2962 | ||
2963 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2964 | if (rc != 0) { | |
2965 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2966 | __func__, rc); | |
2967 | return rc; | |
2968 | } | |
2969 | ||
ce0b16dd | 2970 | root_inode = d_inode(sb->s_root); |
e114e473 CS |
2971 | |
2972 | return 0; | |
2973 | } | |
2974 | ||
2975 | /** | |
fc14f2fe | 2976 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2977 | * @fs_type: passed along without comment |
2978 | * @flags: passed along without comment | |
2979 | * @dev_name: passed along without comment | |
2980 | * @data: passed along without comment | |
e114e473 CS |
2981 | * |
2982 | * Just passes everything along. | |
2983 | * | |
2984 | * Returns what the lower level code does. | |
2985 | */ | |
fc14f2fe AV |
2986 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2987 | int flags, const char *dev_name, void *data) | |
e114e473 | 2988 | { |
fc14f2fe | 2989 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2990 | } |
2991 | ||
2992 | static struct file_system_type smk_fs_type = { | |
2993 | .name = "smackfs", | |
fc14f2fe | 2994 | .mount = smk_mount, |
e114e473 CS |
2995 | .kill_sb = kill_litter_super, |
2996 | }; | |
2997 | ||
2998 | static struct vfsmount *smackfs_mount; | |
2999 | ||
f7112e6c CS |
3000 | static int __init smk_preset_netlabel(struct smack_known *skp) |
3001 | { | |
3002 | skp->smk_netlabel.domain = skp->smk_known; | |
3003 | skp->smk_netlabel.flags = | |
3004 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
3005 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
3006 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
3007 | } | |
3008 | ||
e114e473 CS |
3009 | /** |
3010 | * init_smk_fs - get the smackfs superblock | |
3011 | * | |
3012 | * register the smackfs | |
3013 | * | |
076c54c5 AD |
3014 | * Do not register smackfs if Smack wasn't enabled |
3015 | * on boot. We can not put this method normally under the | |
3016 | * smack_init() code path since the security subsystem get | |
3017 | * initialized before the vfs caches. | |
3018 | * | |
3019 | * Returns true if we were not chosen on boot or if | |
3020 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
3021 | */ |
3022 | static int __init init_smk_fs(void) | |
3023 | { | |
3024 | int err; | |
f7112e6c | 3025 | int rc; |
e114e473 | 3026 | |
d21b7b04 | 3027 | if (smack_enabled == 0) |
076c54c5 AD |
3028 | return 0; |
3029 | ||
e9307237 CS |
3030 | err = smk_init_sysfs(); |
3031 | if (err) | |
3032 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
3033 | ||
e114e473 CS |
3034 | err = register_filesystem(&smk_fs_type); |
3035 | if (!err) { | |
3036 | smackfs_mount = kern_mount(&smk_fs_type); | |
3037 | if (IS_ERR(smackfs_mount)) { | |
3038 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
3039 | err = PTR_ERR(smackfs_mount); | |
3040 | smackfs_mount = NULL; | |
3041 | } | |
3042 | } | |
3043 | ||
e114e473 | 3044 | smk_cipso_doi(); |
4bc87e62 | 3045 | smk_unlbl_ambient(NULL); |
e114e473 | 3046 | |
f7112e6c CS |
3047 | rc = smk_preset_netlabel(&smack_known_floor); |
3048 | if (err == 0 && rc < 0) | |
3049 | err = rc; | |
3050 | rc = smk_preset_netlabel(&smack_known_hat); | |
3051 | if (err == 0 && rc < 0) | |
3052 | err = rc; | |
3053 | rc = smk_preset_netlabel(&smack_known_huh); | |
3054 | if (err == 0 && rc < 0) | |
3055 | err = rc; | |
3056 | rc = smk_preset_netlabel(&smack_known_invalid); | |
3057 | if (err == 0 && rc < 0) | |
3058 | err = rc; | |
3059 | rc = smk_preset_netlabel(&smack_known_star); | |
3060 | if (err == 0 && rc < 0) | |
3061 | err = rc; | |
3062 | rc = smk_preset_netlabel(&smack_known_web); | |
3063 | if (err == 0 && rc < 0) | |
3064 | err = rc; | |
3065 | ||
e114e473 CS |
3066 | return err; |
3067 | } | |
3068 | ||
3069 | __initcall(init_smk_fs); |