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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e114e473 CS |
2 | /* |
3 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
4 | * | |
e114e473 CS |
5 | * Authors: |
6 | * Casey Schaufler <casey@schaufler-ca.com> | |
7 | * Ahmed S. Darwish <darwish.07@gmail.com> | |
8 | * | |
9 | * Special thanks to the authors of selinuxfs. | |
10 | * | |
11 | * Karl MacMillan <kmacmillan@tresys.com> | |
12 | * James Morris <jmorris@redhat.com> | |
e114e473 CS |
13 | */ |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/security.h> | |
18 | #include <linux/mutex.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
6d3dc07c | 20 | #include <net/net_namespace.h> |
e114e473 CS |
21 | #include <net/cipso_ipv4.h> |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/ctype.h> | |
4bc87e62 | 24 | #include <linux/audit.h> |
958d2c2f | 25 | #include <linux/magic.h> |
70f8d9c5 | 26 | #include <linux/mount.h> |
5afdd0f1 | 27 | #include <linux/fs_context.h> |
e114e473 CS |
28 | #include "smack.h" |
29 | ||
21abb1ec | 30 | #define BEBITS (sizeof(__be32) * 8) |
e114e473 CS |
31 | /* |
32 | * smackfs pseudo filesystem. | |
33 | */ | |
34 | ||
35 | enum smk_inos { | |
36 | SMK_ROOT_INO = 2, | |
37 | SMK_LOAD = 3, /* load policy */ | |
38 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
39 | SMK_DOI = 5, /* CIPSO DOI */ | |
40 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
41 | SMK_AMBIENT = 7, /* internet ambient label */ | |
21abb1ec | 42 | SMK_NET4ADDR = 8, /* single label hosts */ |
15446235 | 43 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
ecfcc53f | 44 | SMK_LOGGING = 10, /* logging */ |
7898e1f8 | 45 | SMK_LOAD_SELF = 11, /* task specific rules */ |
828716c2 | 46 | SMK_ACCESSES = 12, /* access policy */ |
f7112e6c CS |
47 | SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ |
48 | SMK_LOAD2 = 14, /* load policy with long labels */ | |
49 | SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ | |
50 | SMK_ACCESS2 = 16, /* make an access check with long labels */ | |
51 | SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ | |
449543b0 | 52 | SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ |
e05b6f98 | 53 | SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ |
00f84f3f | 54 | SMK_SYSLOG = 20, /* change syslog label) */ |
66867818 | 55 | SMK_PTRACE = 21, /* set ptrace rule */ |
bf4b2fee CS |
56 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
57 | SMK_UNCONFINED = 22, /* define an unconfined label */ | |
58 | #endif | |
21abb1ec CS |
59 | #if IS_ENABLED(CONFIG_IPV6) |
60 | SMK_NET6ADDR = 23, /* single label IPv6 hosts */ | |
61 | #endif /* CONFIG_IPV6 */ | |
38416e53 | 62 | SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */ |
e114e473 CS |
63 | }; |
64 | ||
65 | /* | |
66 | * List locks | |
67 | */ | |
e114e473 | 68 | static DEFINE_MUTEX(smack_cipso_lock); |
4bc87e62 | 69 | static DEFINE_MUTEX(smack_ambient_lock); |
21abb1ec CS |
70 | static DEFINE_MUTEX(smk_net4addr_lock); |
71 | #if IS_ENABLED(CONFIG_IPV6) | |
72 | static DEFINE_MUTEX(smk_net6addr_lock); | |
73 | #endif /* CONFIG_IPV6 */ | |
e114e473 CS |
74 | |
75 | /* | |
76 | * This is the "ambient" label for network traffic. | |
77 | * If it isn't somehow marked, use this. | |
78 | * It can be reset via smackfs/ambient | |
79 | */ | |
2f823ff8 | 80 | struct smack_known *smack_net_ambient; |
e114e473 | 81 | |
e114e473 CS |
82 | /* |
83 | * This is the level in a CIPSO header that indicates a | |
84 | * smack label is contained directly in the category set. | |
85 | * It can be reset via smackfs/direct | |
86 | */ | |
87 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
88 | ||
f7112e6c CS |
89 | /* |
90 | * This is the level in a CIPSO header that indicates a | |
91 | * secid is contained directly in the category set. | |
92 | * It can be reset via smackfs/mapped | |
93 | */ | |
94 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; | |
95 | ||
bf4b2fee CS |
96 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
97 | /* | |
98 | * Allow one label to be unconfined. This is for | |
99 | * debugging and application bring-up purposes only. | |
100 | * It is bad and wrong, but everyone seems to expect | |
101 | * to have it. | |
102 | */ | |
103 | struct smack_known *smack_unconfined; | |
104 | #endif | |
105 | ||
00f84f3f CS |
106 | /* |
107 | * If this value is set restrict syslog use to the label specified. | |
108 | * It can be reset via smackfs/syslog | |
109 | */ | |
110 | struct smack_known *smack_syslog_label; | |
15446235 | 111 | |
66867818 LP |
112 | /* |
113 | * Ptrace current rule | |
114 | * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) | |
115 | * SMACK_PTRACE_EXACT labels must match, but can be overriden with | |
116 | * CAP_SYS_PTRACE | |
c47b6584 | 117 | * SMACK_PTRACE_DRACONIAN labels must match, CAP_SYS_PTRACE has no effect |
66867818 LP |
118 | */ |
119 | int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; | |
120 | ||
6d3dc07c CS |
121 | /* |
122 | * Certain IP addresses may be designated as single label hosts. | |
123 | * Packets are sent there unlabeled, but only from tasks that | |
124 | * can write to the specified label. | |
125 | */ | |
7198e2ee | 126 | |
21abb1ec CS |
127 | LIST_HEAD(smk_net4addr_list); |
128 | #if IS_ENABLED(CONFIG_IPV6) | |
129 | LIST_HEAD(smk_net6addr_list); | |
130 | #endif /* CONFIG_IPV6 */ | |
272cd7a8 CS |
131 | |
132 | /* | |
133 | * Rule lists are maintained for each label. | |
272cd7a8 | 134 | */ |
e05b6f98 | 135 | struct smack_parsed_rule { |
2f823ff8 | 136 | struct smack_known *smk_subject; |
21c7eae2 | 137 | struct smack_known *smk_object; |
e05b6f98 RK |
138 | int smk_access1; |
139 | int smk_access2; | |
140 | }; | |
141 | ||
e114e473 | 142 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 143 | |
e114e473 CS |
144 | /* |
145 | * Values for parsing cipso rules | |
146 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
147 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
148 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
149 | */ |
150 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
151 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
152 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
153 | ||
154 | /* | |
155 | * Values for parsing MAC rules | |
156 | * SMK_ACCESS: Maximum possible combination of access permissions | |
157 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
158 | * SMK_LOADLEN: Smack rule length | |
159 | */ | |
5c6d1125 | 160 | #define SMK_OACCESS "rwxa" |
c0ab6e56 | 161 | #define SMK_ACCESS "rwxatl" |
5c6d1125 JS |
162 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
163 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
164 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
165 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 166 | |
f7112e6c CS |
167 | /* |
168 | * Stricly for CIPSO level manipulation. | |
169 | * Set the category bit number in a smack label sized buffer. | |
170 | */ | |
171 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) | |
172 | { | |
173 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) | |
174 | return; | |
175 | ||
176 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
177 | } | |
178 | ||
6d3dc07c CS |
179 | /** |
180 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
181 | * @nap: structure to fill | |
182 | */ | |
183 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
184 | { | |
2f823ff8 CS |
185 | struct smack_known *skp = smk_of_current(); |
186 | ||
6d3dc07c CS |
187 | nap->loginuid = audit_get_loginuid(current); |
188 | nap->sessionid = audit_get_sessionid(current); | |
2f823ff8 | 189 | nap->secid = skp->smk_secid; |
6d3dc07c CS |
190 | } |
191 | ||
192 | /* | |
f7112e6c | 193 | * Value for parsing single label host rules |
6d3dc07c | 194 | * "1.2.3.4 X" |
6d3dc07c CS |
195 | */ |
196 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 197 | |
e114e473 | 198 | /** |
e05b6f98 RK |
199 | * smk_set_access - add a rule to the rule list or replace an old rule |
200 | * @srp: the rule to add or replace | |
7898e1f8 CS |
201 | * @rule_list: the list of rules |
202 | * @rule_lock: the rule list lock | |
e114e473 CS |
203 | * |
204 | * Looks through the current subject/object/access list for | |
205 | * the subject/object pair and replaces the access that was | |
206 | * there. If the pair isn't found add it with the specified | |
207 | * access. | |
81ea714b SL |
208 | * |
209 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
210 | * during the allocation of the new pair to add. | |
e114e473 | 211 | */ |
e05b6f98 RK |
212 | static int smk_set_access(struct smack_parsed_rule *srp, |
213 | struct list_head *rule_list, | |
460d95a1 | 214 | struct mutex *rule_lock) |
e114e473 | 215 | { |
7198e2ee | 216 | struct smack_rule *sp; |
7898e1f8 | 217 | int found = 0; |
e05b6f98 | 218 | int rc = 0; |
e114e473 | 219 | |
7898e1f8 CS |
220 | mutex_lock(rule_lock); |
221 | ||
272cd7a8 CS |
222 | /* |
223 | * Because the object label is less likely to match | |
224 | * than the subject label check it first | |
225 | */ | |
7898e1f8 | 226 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
227 | if (sp->smk_object == srp->smk_object && |
228 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee | 229 | found = 1; |
e05b6f98 RK |
230 | sp->smk_access |= srp->smk_access1; |
231 | sp->smk_access &= ~srp->smk_access2; | |
e114e473 CS |
232 | break; |
233 | } | |
e114e473 CS |
234 | } |
235 | ||
e05b6f98 | 236 | if (found == 0) { |
4e328b08 | 237 | sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL); |
e05b6f98 RK |
238 | if (sp == NULL) { |
239 | rc = -ENOMEM; | |
240 | goto out; | |
241 | } | |
242 | ||
243 | sp->smk_subject = srp->smk_subject; | |
244 | sp->smk_object = srp->smk_object; | |
245 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; | |
246 | ||
247 | list_add_rcu(&sp->list, rule_list); | |
e05b6f98 RK |
248 | } |
249 | ||
250 | out: | |
7898e1f8 | 251 | mutex_unlock(rule_lock); |
e05b6f98 RK |
252 | return rc; |
253 | } | |
254 | ||
255 | /** | |
256 | * smk_perm_from_str - parse smack accesses from a text string | |
257 | * @string: a text string that contains a Smack accesses code | |
258 | * | |
259 | * Returns an integer with respective bits set for specified accesses. | |
260 | */ | |
261 | static int smk_perm_from_str(const char *string) | |
262 | { | |
263 | int perm = 0; | |
264 | const char *cp; | |
e114e473 | 265 | |
e05b6f98 RK |
266 | for (cp = string; ; cp++) |
267 | switch (*cp) { | |
268 | case '-': | |
269 | break; | |
270 | case 'r': | |
271 | case 'R': | |
272 | perm |= MAY_READ; | |
273 | break; | |
274 | case 'w': | |
275 | case 'W': | |
276 | perm |= MAY_WRITE; | |
277 | break; | |
278 | case 'x': | |
279 | case 'X': | |
280 | perm |= MAY_EXEC; | |
281 | break; | |
282 | case 'a': | |
283 | case 'A': | |
284 | perm |= MAY_APPEND; | |
285 | break; | |
286 | case 't': | |
287 | case 'T': | |
288 | perm |= MAY_TRANSMUTE; | |
289 | break; | |
c0ab6e56 CS |
290 | case 'l': |
291 | case 'L': | |
292 | perm |= MAY_LOCK; | |
293 | break; | |
d166c802 CS |
294 | case 'b': |
295 | case 'B': | |
296 | perm |= MAY_BRINGUP; | |
297 | break; | |
e05b6f98 RK |
298 | default: |
299 | return perm; | |
300 | } | |
e114e473 CS |
301 | } |
302 | ||
303 | /** | |
f7112e6c CS |
304 | * smk_fill_rule - Fill Smack rule from strings |
305 | * @subject: subject label string | |
306 | * @object: object label string | |
e05b6f98 RK |
307 | * @access1: access string |
308 | * @access2: string with permissions to be removed | |
0e94ae17 JS |
309 | * @rule: Smack rule |
310 | * @import: if non-zero, import labels | |
3518721a | 311 | * @len: label length limit |
f7112e6c | 312 | * |
e774ad68 | 313 | * Returns 0 on success, appropriate error code on failure. |
e114e473 | 314 | */ |
f7112e6c | 315 | static int smk_fill_rule(const char *subject, const char *object, |
e05b6f98 RK |
316 | const char *access1, const char *access2, |
317 | struct smack_parsed_rule *rule, int import, | |
318 | int len) | |
e114e473 | 319 | { |
f7112e6c | 320 | const char *cp; |
0e94ae17 | 321 | struct smack_known *skp; |
e114e473 | 322 | |
0e94ae17 | 323 | if (import) { |
2f823ff8 | 324 | rule->smk_subject = smk_import_entry(subject, len); |
e774ad68 LP |
325 | if (IS_ERR(rule->smk_subject)) |
326 | return PTR_ERR(rule->smk_subject); | |
0e94ae17 | 327 | |
21c7eae2 | 328 | rule->smk_object = smk_import_entry(object, len); |
e774ad68 LP |
329 | if (IS_ERR(rule->smk_object)) |
330 | return PTR_ERR(rule->smk_object); | |
0e94ae17 | 331 | } else { |
3518721a | 332 | cp = smk_parse_smack(subject, len); |
e774ad68 LP |
333 | if (IS_ERR(cp)) |
334 | return PTR_ERR(cp); | |
f7112e6c CS |
335 | skp = smk_find_entry(cp); |
336 | kfree(cp); | |
0e94ae17 | 337 | if (skp == NULL) |
398ce073 | 338 | return -ENOENT; |
2f823ff8 | 339 | rule->smk_subject = skp; |
0e94ae17 | 340 | |
3518721a | 341 | cp = smk_parse_smack(object, len); |
e774ad68 LP |
342 | if (IS_ERR(cp)) |
343 | return PTR_ERR(cp); | |
f7112e6c CS |
344 | skp = smk_find_entry(cp); |
345 | kfree(cp); | |
0e94ae17 | 346 | if (skp == NULL) |
398ce073 | 347 | return -ENOENT; |
21c7eae2 | 348 | rule->smk_object = skp; |
0e94ae17 | 349 | } |
7198e2ee | 350 | |
e05b6f98 RK |
351 | rule->smk_access1 = smk_perm_from_str(access1); |
352 | if (access2) | |
353 | rule->smk_access2 = smk_perm_from_str(access2); | |
354 | else | |
355 | rule->smk_access2 = ~rule->smk_access1; | |
e114e473 | 356 | |
3518721a | 357 | return 0; |
f7112e6c | 358 | } |
e114e473 | 359 | |
f7112e6c CS |
360 | /** |
361 | * smk_parse_rule - parse Smack rule from load string | |
362 | * @data: string to be parsed whose size is SMK_LOADLEN | |
363 | * @rule: Smack rule | |
364 | * @import: if non-zero, import labels | |
365 | * | |
366 | * Returns 0 on success, -1 on errors. | |
367 | */ | |
e05b6f98 RK |
368 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
369 | int import) | |
f7112e6c CS |
370 | { |
371 | int rc; | |
e114e473 | 372 | |
f7112e6c | 373 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
e05b6f98 RK |
374 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
375 | import, SMK_LABELLEN); | |
f7112e6c CS |
376 | return rc; |
377 | } | |
e114e473 | 378 | |
f7112e6c CS |
379 | /** |
380 | * smk_parse_long_rule - parse Smack rule from rule string | |
381 | * @data: string to be parsed, null terminated | |
e05b6f98 | 382 | * @rule: Will be filled with Smack parsed rule |
f7112e6c | 383 | * @import: if non-zero, import labels |
2e08fb55 | 384 | * @tokens: number of substrings expected in data |
f7112e6c | 385 | * |
e774ad68 | 386 | * Returns number of processed bytes on success, -ERRNO on failure. |
f7112e6c | 387 | */ |
10289b0f RK |
388 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
389 | int import, int tokens) | |
f7112e6c | 390 | { |
10289b0f RK |
391 | ssize_t cnt = 0; |
392 | char *tok[4]; | |
398ce073 | 393 | int rc; |
10289b0f RK |
394 | int i; |
395 | ||
396 | /* | |
397 | * Parsing the rule in-place, filling all white-spaces with '\0' | |
398 | */ | |
399 | for (i = 0; i < tokens; ++i) { | |
400 | while (isspace(data[cnt])) | |
401 | data[cnt++] = '\0'; | |
402 | ||
403 | if (data[cnt] == '\0') | |
404 | /* Unexpected end of data */ | |
e774ad68 | 405 | return -EINVAL; |
10289b0f RK |
406 | |
407 | tok[i] = data + cnt; | |
408 | ||
409 | while (data[cnt] && !isspace(data[cnt])) | |
410 | ++cnt; | |
e05b6f98 | 411 | } |
10289b0f RK |
412 | while (isspace(data[cnt])) |
413 | data[cnt++] = '\0'; | |
f7112e6c | 414 | |
10289b0f RK |
415 | while (i < 4) |
416 | tok[i++] = NULL; | |
417 | ||
398ce073 JS |
418 | rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
419 | return rc == 0 ? cnt : rc; | |
828716c2 JS |
420 | } |
421 | ||
f7112e6c CS |
422 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
423 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
e05b6f98 | 424 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
828716c2 | 425 | /** |
f7112e6c | 426 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
427 | * @file: file pointer, not actually used |
428 | * @buf: where to get the data from | |
429 | * @count: bytes sent | |
430 | * @ppos: where to start - must be 0 | |
431 | * @rule_list: the list of rules to write to | |
432 | * @rule_lock: lock for the rule list | |
e05b6f98 | 433 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 JS |
434 | * |
435 | * Get one smack access rule from above. | |
f7112e6c CS |
436 | * The format for SMK_LONG_FMT is: |
437 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
438 | * The format for SMK_FIXED24_FMT is exactly: | |
439 | * "subject object rwxat" | |
e05b6f98 RK |
440 | * The format for SMK_CHANGE_FMT is: |
441 | * "subject<whitespace>object<whitespace> | |
442 | * acc_enable<whitespace>acc_disable[<whitespace>...]" | |
828716c2 | 443 | */ |
f7112e6c CS |
444 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
445 | size_t count, loff_t *ppos, | |
446 | struct list_head *rule_list, | |
447 | struct mutex *rule_lock, int format) | |
828716c2 | 448 | { |
470043ba | 449 | struct smack_parsed_rule rule; |
828716c2 | 450 | char *data; |
10289b0f RK |
451 | int rc; |
452 | int trunc = 0; | |
453 | int tokens; | |
454 | ssize_t cnt = 0; | |
828716c2 JS |
455 | |
456 | /* | |
457 | * No partial writes. | |
458 | * Enough data must be present. | |
459 | */ | |
460 | if (*ppos != 0) | |
461 | return -EINVAL; | |
828716c2 | 462 | |
f7112e6c CS |
463 | if (format == SMK_FIXED24_FMT) { |
464 | /* | |
465 | * Minor hack for backward compatibility | |
466 | */ | |
c0ab6e56 | 467 | if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
f7112e6c | 468 | return -EINVAL; |
10289b0f RK |
469 | } else { |
470 | if (count >= PAGE_SIZE) { | |
471 | count = PAGE_SIZE - 1; | |
472 | trunc = 1; | |
473 | } | |
474 | } | |
f7112e6c | 475 | |
16e5c1fc AV |
476 | data = memdup_user_nul(buf, count); |
477 | if (IS_ERR(data)) | |
478 | return PTR_ERR(data); | |
828716c2 | 479 | |
10289b0f RK |
480 | /* |
481 | * In case of parsing only part of user buf, | |
482 | * avoid having partial rule at the data buffer | |
483 | */ | |
484 | if (trunc) { | |
485 | while (count > 0 && (data[count - 1] != '\n')) | |
486 | --count; | |
487 | if (count == 0) { | |
488 | rc = -EINVAL; | |
470043ba | 489 | goto out; |
10289b0f | 490 | } |
f7112e6c CS |
491 | } |
492 | ||
10289b0f RK |
493 | data[count] = '\0'; |
494 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); | |
495 | while (cnt < count) { | |
496 | if (format == SMK_FIXED24_FMT) { | |
497 | rc = smk_parse_rule(data, &rule, 1); | |
e774ad68 | 498 | if (rc < 0) |
10289b0f | 499 | goto out; |
10289b0f RK |
500 | cnt = count; |
501 | } else { | |
502 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); | |
e774ad68 LP |
503 | if (rc < 0) |
504 | goto out; | |
505 | if (rc == 0) { | |
10289b0f RK |
506 | rc = -EINVAL; |
507 | goto out; | |
508 | } | |
509 | cnt += rc; | |
510 | } | |
511 | ||
512 | if (rule_list == NULL) | |
513 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, | |
460d95a1 | 514 | &rule.smk_subject->smk_rules_lock); |
10289b0f | 515 | else |
460d95a1 | 516 | rc = smk_set_access(&rule, rule_list, rule_lock); |
10289b0f RK |
517 | |
518 | if (rc) | |
519 | goto out; | |
272cd7a8 CS |
520 | } |
521 | ||
10289b0f | 522 | rc = cnt; |
e114e473 CS |
523 | out: |
524 | kfree(data); | |
525 | return rc; | |
526 | } | |
527 | ||
7898e1f8 | 528 | /* |
40809565 | 529 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
530 | */ |
531 | ||
40809565 CS |
532 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
533 | struct list_head *head) | |
7898e1f8 | 534 | { |
272cd7a8 | 535 | struct list_head *list; |
01fa8474 RK |
536 | int i = *pos; |
537 | ||
538 | rcu_read_lock(); | |
539 | for (list = rcu_dereference(list_next_rcu(head)); | |
540 | list != head; | |
541 | list = rcu_dereference(list_next_rcu(list))) { | |
542 | if (i-- == 0) | |
543 | return list; | |
544 | } | |
272cd7a8 | 545 | |
01fa8474 | 546 | return NULL; |
7898e1f8 CS |
547 | } |
548 | ||
40809565 CS |
549 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
550 | struct list_head *head) | |
7898e1f8 CS |
551 | { |
552 | struct list_head *list = v; | |
553 | ||
01fa8474 RK |
554 | ++*pos; |
555 | list = rcu_dereference(list_next_rcu(list)); | |
556 | ||
557 | return (list == head) ? NULL : list; | |
7898e1f8 CS |
558 | } |
559 | ||
40809565 CS |
560 | static void smk_seq_stop(struct seq_file *s, void *v) |
561 | { | |
01fa8474 | 562 | rcu_read_unlock(); |
40809565 CS |
563 | } |
564 | ||
f7112e6c | 565 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 566 | { |
f7112e6c CS |
567 | /* |
568 | * Don't show any rules with label names too long for | |
569 | * interface file (/smack/load or /smack/load2) | |
570 | * because you should expect to be able to write | |
571 | * anything you read back. | |
572 | */ | |
2f823ff8 | 573 | if (strlen(srp->smk_subject->smk_known) >= max || |
21c7eae2 | 574 | strlen(srp->smk_object->smk_known) >= max) |
f7112e6c | 575 | return; |
7898e1f8 | 576 | |
65ee7f45 RK |
577 | if (srp->smk_access == 0) |
578 | return; | |
579 | ||
21c7eae2 LP |
580 | seq_printf(s, "%s %s", |
581 | srp->smk_subject->smk_known, | |
582 | srp->smk_object->smk_known); | |
7898e1f8 CS |
583 | |
584 | seq_putc(s, ' '); | |
585 | ||
586 | if (srp->smk_access & MAY_READ) | |
587 | seq_putc(s, 'r'); | |
588 | if (srp->smk_access & MAY_WRITE) | |
589 | seq_putc(s, 'w'); | |
590 | if (srp->smk_access & MAY_EXEC) | |
591 | seq_putc(s, 'x'); | |
592 | if (srp->smk_access & MAY_APPEND) | |
593 | seq_putc(s, 'a'); | |
594 | if (srp->smk_access & MAY_TRANSMUTE) | |
595 | seq_putc(s, 't'); | |
c0ab6e56 CS |
596 | if (srp->smk_access & MAY_LOCK) |
597 | seq_putc(s, 'l'); | |
d166c802 CS |
598 | if (srp->smk_access & MAY_BRINGUP) |
599 | seq_putc(s, 'b'); | |
7898e1f8 CS |
600 | |
601 | seq_putc(s, '\n'); | |
f7112e6c CS |
602 | } |
603 | ||
604 | /* | |
605 | * Seq_file read operations for /smack/load | |
606 | */ | |
607 | ||
608 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
609 | { | |
460d95a1 | 610 | return smk_seq_start(s, pos, &smack_known_list); |
f7112e6c CS |
611 | } |
612 | ||
613 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
614 | { | |
460d95a1 | 615 | return smk_seq_next(s, v, pos, &smack_known_list); |
f7112e6c CS |
616 | } |
617 | ||
618 | static int load_seq_show(struct seq_file *s, void *v) | |
619 | { | |
620 | struct list_head *list = v; | |
460d95a1 VG |
621 | struct smack_rule *srp; |
622 | struct smack_known *skp = | |
623 | list_entry_rcu(list, struct smack_known, list); | |
f7112e6c | 624 | |
460d95a1 VG |
625 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) |
626 | smk_rule_show(s, srp, SMK_LABELLEN); | |
7898e1f8 CS |
627 | |
628 | return 0; | |
629 | } | |
630 | ||
7898e1f8 | 631 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
632 | .start = load2_seq_start, |
633 | .next = load2_seq_next, | |
7898e1f8 | 634 | .show = load_seq_show, |
40809565 | 635 | .stop = smk_seq_stop, |
7898e1f8 CS |
636 | }; |
637 | ||
638 | /** | |
639 | * smk_open_load - open() for /smack/load | |
640 | * @inode: inode structure representing file | |
641 | * @file: "load" file pointer | |
642 | * | |
643 | * For reading, use load_seq_* seq_file reading operations. | |
644 | */ | |
645 | static int smk_open_load(struct inode *inode, struct file *file) | |
646 | { | |
647 | return seq_open(file, &load_seq_ops); | |
648 | } | |
649 | ||
650 | /** | |
651 | * smk_write_load - write() for /smack/load | |
652 | * @file: file pointer, not actually used | |
653 | * @buf: where to get the data from | |
654 | * @count: bytes sent | |
655 | * @ppos: where to start - must be 0 | |
656 | * | |
657 | */ | |
658 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
659 | size_t count, loff_t *ppos) | |
660 | { | |
7898e1f8 CS |
661 | /* |
662 | * Must have privilege. | |
663 | * No partial writes. | |
664 | * Enough data must be present. | |
665 | */ | |
1880eff7 | 666 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
667 | return -EPERM; |
668 | ||
f7112e6c CS |
669 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
670 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
671 | } |
672 | ||
e114e473 CS |
673 | static const struct file_operations smk_load_ops = { |
674 | .open = smk_open_load, | |
675 | .read = seq_read, | |
676 | .llseek = seq_lseek, | |
677 | .write = smk_write_load, | |
cb622bbb | 678 | .release = seq_release, |
e114e473 CS |
679 | }; |
680 | ||
681 | /** | |
682 | * smk_cipso_doi - initialize the CIPSO domain | |
683 | */ | |
30aa4faf | 684 | static void smk_cipso_doi(void) |
e114e473 CS |
685 | { |
686 | int rc; | |
687 | struct cipso_v4_doi *doip; | |
6d3dc07c | 688 | struct netlbl_audit nai; |
e114e473 | 689 | |
6d3dc07c | 690 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 691 | |
6d3dc07c | 692 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
693 | if (rc != 0) |
694 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
695 | __func__, __LINE__, rc); | |
696 | ||
f91488ee | 697 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL); |
e114e473 CS |
698 | doip->map.std = NULL; |
699 | doip->doi = smk_cipso_doi_value; | |
700 | doip->type = CIPSO_V4_MAP_PASS; | |
701 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
702 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
703 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
704 | ||
6d3dc07c | 705 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 706 | if (rc != 0) { |
6c2e8ac0 PM |
707 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
708 | __func__, __LINE__, rc); | |
709 | kfree(doip); | |
710 | return; | |
711 | } | |
6d3dc07c | 712 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
713 | if (rc != 0) { |
714 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 715 | __func__, __LINE__, rc); |
0934ad42 | 716 | netlbl_cfg_cipsov4_del(doip->doi, &nai); |
6c2e8ac0 | 717 | return; |
b1edeb10 | 718 | } |
e114e473 CS |
719 | } |
720 | ||
4bc87e62 CS |
721 | /** |
722 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 723 | * @oldambient: previous domain string |
4bc87e62 | 724 | */ |
30aa4faf | 725 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
726 | { |
727 | int rc; | |
6d3dc07c | 728 | struct netlbl_audit nai; |
4bc87e62 | 729 | |
6d3dc07c | 730 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
731 | |
732 | if (oldambient != NULL) { | |
6d3dc07c | 733 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
734 | if (rc != 0) |
735 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
736 | __func__, __LINE__, rc); | |
737 | } | |
f7112e6c | 738 | if (smack_net_ambient == NULL) |
2f823ff8 | 739 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 740 | |
2f823ff8 | 741 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 742 | NULL, NULL, &nai); |
4bc87e62 CS |
743 | if (rc != 0) |
744 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
745 | __func__, __LINE__, rc); | |
746 | } | |
747 | ||
e114e473 CS |
748 | /* |
749 | * Seq_file read operations for /smack/cipso | |
750 | */ | |
751 | ||
752 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
753 | { | |
40809565 | 754 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
755 | } |
756 | ||
757 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
758 | { | |
40809565 | 759 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
760 | } |
761 | ||
762 | /* | |
763 | * Print cipso labels in format: | |
764 | * label level[/cat[,cat]] | |
765 | */ | |
766 | static int cipso_seq_show(struct seq_file *s, void *v) | |
767 | { | |
7198e2ee EB |
768 | struct list_head *list = v; |
769 | struct smack_known *skp = | |
01fa8474 | 770 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 771 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 772 | char sep = '/'; |
e114e473 | 773 | int i; |
e114e473 | 774 | |
f7112e6c CS |
775 | /* |
776 | * Don't show a label that could not have been set using | |
777 | * /smack/cipso. This is in support of the notion that | |
778 | * anything read from /smack/cipso ought to be writeable | |
779 | * to /smack/cipso. | |
780 | * | |
781 | * /smack/cipso2 should be used instead. | |
782 | */ | |
783 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
784 | return 0; |
785 | ||
f7112e6c | 786 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 787 | |
4fbe63d1 PM |
788 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
789 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
790 | seq_printf(s, "%c%d", sep, i); |
791 | sep = ','; | |
792 | } | |
e114e473 CS |
793 | |
794 | seq_putc(s, '\n'); | |
795 | ||
796 | return 0; | |
797 | } | |
798 | ||
88e9d34c | 799 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 800 | .start = cipso_seq_start, |
e114e473 CS |
801 | .next = cipso_seq_next, |
802 | .show = cipso_seq_show, | |
40809565 | 803 | .stop = smk_seq_stop, |
e114e473 CS |
804 | }; |
805 | ||
806 | /** | |
807 | * smk_open_cipso - open() for /smack/cipso | |
808 | * @inode: inode structure representing file | |
809 | * @file: "cipso" file pointer | |
810 | * | |
811 | * Connect our cipso_seq_* operations with /smack/cipso | |
812 | * file_operations | |
813 | */ | |
814 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
815 | { | |
816 | return seq_open(file, &cipso_seq_ops); | |
817 | } | |
818 | ||
819 | /** | |
f7112e6c | 820 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 821 | * @file: file pointer, not actually used |
e114e473 CS |
822 | * @buf: where to get the data from |
823 | * @count: bytes sent | |
824 | * @ppos: where to start | |
f7112e6c | 825 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
826 | * |
827 | * Accepts only one cipso rule per write call. | |
828 | * Returns number of bytes written or error code, as appropriate | |
829 | */ | |
f7112e6c CS |
830 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
831 | size_t count, loff_t *ppos, int format) | |
e114e473 | 832 | { |
ccfd889a | 833 | struct netlbl_lsm_catmap *old_cat, *new_cat = NULL; |
e114e473 | 834 | struct smack_known *skp; |
f7112e6c CS |
835 | struct netlbl_lsm_secattr ncats; |
836 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 837 | int maplevel; |
f7112e6c | 838 | unsigned int cat; |
e114e473 CS |
839 | int catlen; |
840 | ssize_t rc = -EINVAL; | |
841 | char *data = NULL; | |
842 | char *rule; | |
843 | int ret; | |
844 | int i; | |
845 | ||
846 | /* | |
847 | * Must have privilege. | |
848 | * No partial writes. | |
849 | * Enough data must be present. | |
850 | */ | |
1880eff7 | 851 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
852 | return -EPERM; |
853 | if (*ppos != 0) | |
854 | return -EINVAL; | |
f7112e6c CS |
855 | if (format == SMK_FIXED24_FMT && |
856 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 | 857 | return -EINVAL; |
49ec114a TH |
858 | if (count > PAGE_SIZE) |
859 | return -EINVAL; | |
e114e473 | 860 | |
16e5c1fc AV |
861 | data = memdup_user_nul(buf, count); |
862 | if (IS_ERR(data)) | |
863 | return PTR_ERR(data); | |
e114e473 | 864 | |
e114e473 CS |
865 | rule = data; |
866 | /* | |
867 | * Only allow one writer at a time. Writes should be | |
868 | * quite rare and small in any case. | |
869 | */ | |
870 | mutex_lock(&smack_cipso_lock); | |
871 | ||
872 | skp = smk_import_entry(rule, 0); | |
e774ad68 LP |
873 | if (IS_ERR(skp)) { |
874 | rc = PTR_ERR(skp); | |
e114e473 | 875 | goto out; |
e774ad68 | 876 | } |
e114e473 | 877 | |
f7112e6c CS |
878 | if (format == SMK_FIXED24_FMT) |
879 | rule += SMK_LABELLEN; | |
880 | else | |
0fcfee61 | 881 | rule += strlen(skp->smk_known) + 1; |
f7112e6c | 882 | |
84e99e58 CS |
883 | if (rule > data + count) { |
884 | rc = -EOVERFLOW; | |
885 | goto out; | |
886 | } | |
887 | ||
e114e473 | 888 | ret = sscanf(rule, "%d", &maplevel); |
42a2df3e | 889 | if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL) |
e114e473 CS |
890 | goto out; |
891 | ||
892 | rule += SMK_DIGITLEN; | |
84e99e58 CS |
893 | if (rule > data + count) { |
894 | rc = -EOVERFLOW; | |
895 | goto out; | |
896 | } | |
897 | ||
e114e473 | 898 | ret = sscanf(rule, "%d", &catlen); |
3ad49d37 | 899 | if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
900 | goto out; |
901 | ||
f7112e6c CS |
902 | if (format == SMK_FIXED24_FMT && |
903 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
904 | goto out; |
905 | ||
906 | memset(mapcatset, 0, sizeof(mapcatset)); | |
907 | ||
908 | for (i = 0; i < catlen; i++) { | |
909 | rule += SMK_DIGITLEN; | |
a6bd4f6d DC |
910 | if (rule > data + count) { |
911 | rc = -EOVERFLOW; | |
912 | goto out; | |
913 | } | |
f7112e6c | 914 | ret = sscanf(rule, "%u", &cat); |
677264e8 | 915 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
916 | goto out; |
917 | ||
918 | smack_catset_bit(cat, mapcatset); | |
919 | } | |
ccfd889a DA |
920 | ncats.flags = 0; |
921 | if (catlen == 0) { | |
922 | ncats.attr.mls.cat = NULL; | |
923 | ncats.attr.mls.lvl = maplevel; | |
924 | new_cat = netlbl_catmap_alloc(GFP_ATOMIC); | |
925 | if (new_cat) | |
926 | new_cat->next = ncats.attr.mls.cat; | |
927 | ncats.attr.mls.cat = new_cat; | |
928 | skp->smk_netlabel.flags &= ~(1U << 3); | |
929 | rc = 0; | |
930 | } else { | |
931 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); | |
932 | } | |
f7112e6c | 933 | if (rc >= 0) { |
0817534f | 934 | old_cat = skp->smk_netlabel.attr.mls.cat; |
2749749a | 935 | rcu_assign_pointer(skp->smk_netlabel.attr.mls.cat, ncats.attr.mls.cat); |
f7112e6c | 936 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; |
0817534f PG |
937 | synchronize_rcu(); |
938 | netlbl_catmap_free(old_cat); | |
f7112e6c | 939 | rc = count; |
322dd63c CS |
940 | /* |
941 | * This mapping may have been cached, so clear the cache. | |
942 | */ | |
943 | netlbl_cache_invalidate(); | |
e114e473 CS |
944 | } |
945 | ||
e114e473 CS |
946 | out: |
947 | mutex_unlock(&smack_cipso_lock); | |
e114e473 CS |
948 | kfree(data); |
949 | return rc; | |
950 | } | |
951 | ||
f7112e6c CS |
952 | /** |
953 | * smk_write_cipso - write() for /smack/cipso | |
954 | * @file: file pointer, not actually used | |
955 | * @buf: where to get the data from | |
956 | * @count: bytes sent | |
957 | * @ppos: where to start | |
958 | * | |
959 | * Accepts only one cipso rule per write call. | |
960 | * Returns number of bytes written or error code, as appropriate | |
961 | */ | |
962 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
963 | size_t count, loff_t *ppos) | |
964 | { | |
965 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
966 | } | |
967 | ||
e114e473 CS |
968 | static const struct file_operations smk_cipso_ops = { |
969 | .open = smk_open_cipso, | |
970 | .read = seq_read, | |
971 | .llseek = seq_lseek, | |
972 | .write = smk_write_cipso, | |
973 | .release = seq_release, | |
974 | }; | |
975 | ||
f7112e6c CS |
976 | /* |
977 | * Seq_file read operations for /smack/cipso2 | |
978 | */ | |
979 | ||
980 | /* | |
981 | * Print cipso labels in format: | |
982 | * label level[/cat[,cat]] | |
983 | */ | |
984 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
985 | { | |
986 | struct list_head *list = v; | |
987 | struct smack_known *skp = | |
01fa8474 | 988 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 989 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
f7112e6c CS |
990 | char sep = '/'; |
991 | int i; | |
992 | ||
993 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
994 | ||
4fbe63d1 PM |
995 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
996 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
997 | seq_printf(s, "%c%d", sep, i); |
998 | sep = ','; | |
999 | } | |
1000 | ||
1001 | seq_putc(s, '\n'); | |
1002 | ||
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | static const struct seq_operations cipso2_seq_ops = { | |
1007 | .start = cipso_seq_start, | |
1008 | .next = cipso_seq_next, | |
1009 | .show = cipso2_seq_show, | |
1010 | .stop = smk_seq_stop, | |
1011 | }; | |
1012 | ||
1013 | /** | |
1014 | * smk_open_cipso2 - open() for /smack/cipso2 | |
1015 | * @inode: inode structure representing file | |
1016 | * @file: "cipso2" file pointer | |
1017 | * | |
1018 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
1019 | * file_operations | |
1020 | */ | |
1021 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
1022 | { | |
1023 | return seq_open(file, &cipso2_seq_ops); | |
1024 | } | |
1025 | ||
1026 | /** | |
1027 | * smk_write_cipso2 - write() for /smack/cipso2 | |
1028 | * @file: file pointer, not actually used | |
1029 | * @buf: where to get the data from | |
1030 | * @count: bytes sent | |
1031 | * @ppos: where to start | |
1032 | * | |
1033 | * Accepts only one cipso rule per write call. | |
1034 | * Returns number of bytes written or error code, as appropriate | |
1035 | */ | |
1036 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1037 | size_t count, loff_t *ppos) | |
1038 | { | |
1039 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1040 | } | |
1041 | ||
1042 | static const struct file_operations smk_cipso2_ops = { | |
1043 | .open = smk_open_cipso2, | |
1044 | .read = seq_read, | |
1045 | .llseek = seq_lseek, | |
1046 | .write = smk_write_cipso2, | |
1047 | .release = seq_release, | |
1048 | }; | |
1049 | ||
6d3dc07c CS |
1050 | /* |
1051 | * Seq_file read operations for /smack/netlabel | |
1052 | */ | |
1053 | ||
21abb1ec | 1054 | static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
6d3dc07c | 1055 | { |
21abb1ec | 1056 | return smk_seq_start(s, pos, &smk_net4addr_list); |
6d3dc07c CS |
1057 | } |
1058 | ||
21abb1ec | 1059 | static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
6d3dc07c | 1060 | { |
21abb1ec | 1061 | return smk_seq_next(s, v, pos, &smk_net4addr_list); |
6d3dc07c | 1062 | } |
6d3dc07c CS |
1063 | |
1064 | /* | |
1065 | * Print host/label pairs | |
1066 | */ | |
21abb1ec | 1067 | static int net4addr_seq_show(struct seq_file *s, void *v) |
6d3dc07c | 1068 | { |
7198e2ee | 1069 | struct list_head *list = v; |
21abb1ec CS |
1070 | struct smk_net4addr *skp = |
1071 | list_entry_rcu(list, struct smk_net4addr, list); | |
1072 | char *kp = SMACK_CIPSO_OPTION; | |
6d3dc07c | 1073 | |
21abb1ec CS |
1074 | if (skp->smk_label != NULL) |
1075 | kp = skp->smk_label->smk_known; | |
1076 | seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr, | |
1077 | skp->smk_masks, kp); | |
6d3dc07c CS |
1078 | |
1079 | return 0; | |
1080 | } | |
1081 | ||
21abb1ec CS |
1082 | static const struct seq_operations net4addr_seq_ops = { |
1083 | .start = net4addr_seq_start, | |
1084 | .next = net4addr_seq_next, | |
1085 | .show = net4addr_seq_show, | |
40809565 | 1086 | .stop = smk_seq_stop, |
6d3dc07c CS |
1087 | }; |
1088 | ||
1089 | /** | |
21abb1ec | 1090 | * smk_open_net4addr - open() for /smack/netlabel |
6d3dc07c CS |
1091 | * @inode: inode structure representing file |
1092 | * @file: "netlabel" file pointer | |
1093 | * | |
21abb1ec | 1094 | * Connect our net4addr_seq_* operations with /smack/netlabel |
6d3dc07c CS |
1095 | * file_operations |
1096 | */ | |
21abb1ec | 1097 | static int smk_open_net4addr(struct inode *inode, struct file *file) |
6d3dc07c | 1098 | { |
21abb1ec | 1099 | return seq_open(file, &net4addr_seq_ops); |
6d3dc07c CS |
1100 | } |
1101 | ||
113a0e45 | 1102 | /** |
21abb1ec | 1103 | * smk_net4addr_insert |
113a0e45 | 1104 | * @new : netlabel to insert |
1105 | * | |
21abb1ec | 1106 | * This helper insert netlabel in the smack_net4addrs list |
113a0e45 | 1107 | * sorted by netmask length (longest to smallest) |
21abb1ec | 1108 | * locked by &smk_net4addr_lock in smk_write_net4addr |
7198e2ee | 1109 | * |
113a0e45 | 1110 | */ |
21abb1ec | 1111 | static void smk_net4addr_insert(struct smk_net4addr *new) |
113a0e45 | 1112 | { |
21abb1ec CS |
1113 | struct smk_net4addr *m; |
1114 | struct smk_net4addr *m_next; | |
113a0e45 | 1115 | |
21abb1ec CS |
1116 | if (list_empty(&smk_net4addr_list)) { |
1117 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1118 | return; |
1119 | } | |
1120 | ||
21abb1ec CS |
1121 | m = list_entry_rcu(smk_net4addr_list.next, |
1122 | struct smk_net4addr, list); | |
7198e2ee | 1123 | |
113a0e45 | 1124 | /* the comparison '>' is a bit hacky, but works */ |
21abb1ec CS |
1125 | if (new->smk_masks > m->smk_masks) { |
1126 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1127 | return; |
1128 | } | |
7198e2ee | 1129 | |
21abb1ec CS |
1130 | list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
1131 | if (list_is_last(&m->list, &smk_net4addr_list)) { | |
7198e2ee | 1132 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1133 | return; |
1134 | } | |
05725f7e | 1135 | m_next = list_entry_rcu(m->list.next, |
21abb1ec CS |
1136 | struct smk_net4addr, list); |
1137 | if (new->smk_masks > m_next->smk_masks) { | |
7198e2ee | 1138 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1139 | return; |
1140 | } | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | ||
6d3dc07c | 1145 | /** |
21abb1ec | 1146 | * smk_write_net4addr - write() for /smack/netlabel |
251a2a95 | 1147 | * @file: file pointer, not actually used |
6d3dc07c CS |
1148 | * @buf: where to get the data from |
1149 | * @count: bytes sent | |
1150 | * @ppos: where to start | |
1151 | * | |
21abb1ec | 1152 | * Accepts only one net4addr per write call. |
6d3dc07c CS |
1153 | * Returns number of bytes written or error code, as appropriate |
1154 | */ | |
21abb1ec | 1155 | static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
6d3dc07c CS |
1156 | size_t count, loff_t *ppos) |
1157 | { | |
21abb1ec | 1158 | struct smk_net4addr *snp; |
6d3dc07c | 1159 | struct sockaddr_in newname; |
f7112e6c | 1160 | char *smack; |
21abb1ec | 1161 | struct smack_known *skp = NULL; |
f7112e6c | 1162 | char *data; |
6d3dc07c CS |
1163 | char *host = (char *)&newname.sin_addr.s_addr; |
1164 | int rc; | |
1165 | struct netlbl_audit audit_info; | |
1166 | struct in_addr mask; | |
1167 | unsigned int m; | |
21abb1ec | 1168 | unsigned int masks; |
7198e2ee | 1169 | int found; |
113a0e45 | 1170 | u32 mask_bits = (1<<31); |
6d3dc07c | 1171 | __be32 nsa; |
113a0e45 | 1172 | u32 temp_mask; |
6d3dc07c CS |
1173 | |
1174 | /* | |
1175 | * Must have privilege. | |
1176 | * No partial writes. | |
1177 | * Enough data must be present. | |
1178 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1179 | * "<addr, as a.b.c.d><space><label>" | |
1180 | */ | |
1880eff7 | 1181 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1182 | return -EPERM; |
1183 | if (*ppos != 0) | |
1184 | return -EINVAL; | |
7ef4c19d | 1185 | if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
6d3dc07c | 1186 | return -EINVAL; |
f7112e6c | 1187 | |
16e5c1fc AV |
1188 | data = memdup_user_nul(buf, count); |
1189 | if (IS_ERR(data)) | |
1190 | return PTR_ERR(data); | |
f7112e6c CS |
1191 | |
1192 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1193 | if (smack == NULL) { | |
1194 | rc = -ENOMEM; | |
1195 | goto free_data_out; | |
1196 | } | |
6d3dc07c | 1197 | |
ec554fa7 | 1198 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
21abb1ec | 1199 | &host[0], &host[1], &host[2], &host[3], &masks, smack); |
6d3dc07c CS |
1200 | if (rc != 6) { |
1201 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1202 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1203 | if (rc != 5) { |
1204 | rc = -EINVAL; | |
1205 | goto free_out; | |
1206 | } | |
21abb1ec | 1207 | masks = 32; |
6d3dc07c | 1208 | } |
21abb1ec | 1209 | if (masks > BEBITS) { |
f7112e6c CS |
1210 | rc = -EINVAL; |
1211 | goto free_out; | |
1212 | } | |
6d3dc07c | 1213 | |
f7112e6c CS |
1214 | /* |
1215 | * If smack begins with '-', it is an option, don't import it | |
1216 | */ | |
4303154e | 1217 | if (smack[0] != '-') { |
21c7eae2 | 1218 | skp = smk_import_entry(smack, 0); |
e774ad68 LP |
1219 | if (IS_ERR(skp)) { |
1220 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1221 | goto free_out; |
1222 | } | |
4303154e | 1223 | } else { |
21abb1ec CS |
1224 | /* |
1225 | * Only the -CIPSO option is supported for IPv4 | |
1226 | */ | |
1227 | if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { | |
f7112e6c CS |
1228 | rc = -EINVAL; |
1229 | goto free_out; | |
1230 | } | |
4303154e | 1231 | } |
6d3dc07c | 1232 | |
21abb1ec | 1233 | for (m = masks, temp_mask = 0; m > 0; m--) { |
113a0e45 | 1234 | temp_mask |= mask_bits; |
1235 | mask_bits >>= 1; | |
6d3dc07c | 1236 | } |
113a0e45 | 1237 | mask.s_addr = cpu_to_be32(temp_mask); |
1238 | ||
1239 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1240 | /* |
1241 | * Only allow one writer at a time. Writes should be | |
1242 | * quite rare and small in any case. | |
1243 | */ | |
21abb1ec | 1244 | mutex_lock(&smk_net4addr_lock); |
6d3dc07c CS |
1245 | |
1246 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1247 | /* try to find if the prefix is already in the list */ |
7198e2ee | 1248 | found = 0; |
21abb1ec CS |
1249 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
1250 | if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { | |
7198e2ee | 1251 | found = 1; |
6d3dc07c | 1252 | break; |
7198e2ee EB |
1253 | } |
1254 | } | |
6d3dc07c CS |
1255 | smk_netlabel_audit_set(&audit_info); |
1256 | ||
7198e2ee | 1257 | if (found == 0) { |
21c7eae2 LP |
1258 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
1259 | if (snp == NULL) | |
6d3dc07c CS |
1260 | rc = -ENOMEM; |
1261 | else { | |
1262 | rc = 0; | |
21abb1ec | 1263 | snp->smk_host.s_addr = newname.sin_addr.s_addr; |
21c7eae2 LP |
1264 | snp->smk_mask.s_addr = mask.s_addr; |
1265 | snp->smk_label = skp; | |
21abb1ec CS |
1266 | snp->smk_masks = masks; |
1267 | smk_net4addr_insert(snp); | |
6d3dc07c CS |
1268 | } |
1269 | } else { | |
21abb1ec CS |
1270 | /* |
1271 | * Delete the unlabeled entry, only if the previous label | |
1272 | * wasn't the special CIPSO option | |
1273 | */ | |
1274 | if (snp->smk_label != NULL) | |
4303154e | 1275 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
21abb1ec | 1276 | &snp->smk_host, &snp->smk_mask, |
4303154e EB |
1277 | PF_INET, &audit_info); |
1278 | else | |
1279 | rc = 0; | |
21c7eae2 | 1280 | snp->smk_label = skp; |
6d3dc07c CS |
1281 | } |
1282 | ||
1283 | /* | |
1284 | * Now tell netlabel about the single label nature of | |
1285 | * this host so that incoming packets get labeled. | |
4303154e | 1286 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1287 | */ |
21abb1ec | 1288 | if (rc == 0 && skp != NULL) |
6d3dc07c | 1289 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
21abb1ec | 1290 | &snp->smk_host, &snp->smk_mask, PF_INET, |
21c7eae2 | 1291 | snp->smk_label->smk_secid, &audit_info); |
6d3dc07c CS |
1292 | |
1293 | if (rc == 0) | |
1294 | rc = count; | |
1295 | ||
21abb1ec CS |
1296 | mutex_unlock(&smk_net4addr_lock); |
1297 | ||
1298 | free_out: | |
1299 | kfree(smack); | |
1300 | free_data_out: | |
1301 | kfree(data); | |
1302 | ||
1303 | return rc; | |
1304 | } | |
1305 | ||
1306 | static const struct file_operations smk_net4addr_ops = { | |
1307 | .open = smk_open_net4addr, | |
1308 | .read = seq_read, | |
1309 | .llseek = seq_lseek, | |
1310 | .write = smk_write_net4addr, | |
1311 | .release = seq_release, | |
1312 | }; | |
1313 | ||
1314 | #if IS_ENABLED(CONFIG_IPV6) | |
1315 | /* | |
1316 | * Seq_file read operations for /smack/netlabel6 | |
1317 | */ | |
1318 | ||
1319 | static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) | |
1320 | { | |
1321 | return smk_seq_start(s, pos, &smk_net6addr_list); | |
1322 | } | |
1323 | ||
1324 | static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1325 | { | |
1326 | return smk_seq_next(s, v, pos, &smk_net6addr_list); | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * Print host/label pairs | |
1331 | */ | |
1332 | static int net6addr_seq_show(struct seq_file *s, void *v) | |
1333 | { | |
1334 | struct list_head *list = v; | |
1335 | struct smk_net6addr *skp = | |
1336 | list_entry(list, struct smk_net6addr, list); | |
1337 | ||
1338 | if (skp->smk_label != NULL) | |
1339 | seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks, | |
1340 | skp->smk_label->smk_known); | |
1341 | ||
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | static const struct seq_operations net6addr_seq_ops = { | |
1346 | .start = net6addr_seq_start, | |
1347 | .next = net6addr_seq_next, | |
1348 | .show = net6addr_seq_show, | |
1349 | .stop = smk_seq_stop, | |
1350 | }; | |
1351 | ||
1352 | /** | |
1353 | * smk_open_net6addr - open() for /smack/netlabel | |
1354 | * @inode: inode structure representing file | |
1355 | * @file: "netlabel" file pointer | |
1356 | * | |
1357 | * Connect our net6addr_seq_* operations with /smack/netlabel | |
1358 | * file_operations | |
1359 | */ | |
1360 | static int smk_open_net6addr(struct inode *inode, struct file *file) | |
1361 | { | |
1362 | return seq_open(file, &net6addr_seq_ops); | |
1363 | } | |
1364 | ||
1365 | /** | |
1366 | * smk_net6addr_insert | |
1367 | * @new : entry to insert | |
1368 | * | |
1369 | * This inserts an entry in the smack_net6addrs list | |
1370 | * sorted by netmask length (longest to smallest) | |
1371 | * locked by &smk_net6addr_lock in smk_write_net6addr | |
1372 | * | |
1373 | */ | |
1374 | static void smk_net6addr_insert(struct smk_net6addr *new) | |
1375 | { | |
1376 | struct smk_net6addr *m_next; | |
1377 | struct smk_net6addr *m; | |
1378 | ||
1379 | if (list_empty(&smk_net6addr_list)) { | |
1380 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1381 | return; | |
1382 | } | |
1383 | ||
1384 | m = list_entry_rcu(smk_net6addr_list.next, | |
1385 | struct smk_net6addr, list); | |
1386 | ||
1387 | if (new->smk_masks > m->smk_masks) { | |
1388 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1389 | return; | |
1390 | } | |
1391 | ||
1392 | list_for_each_entry_rcu(m, &smk_net6addr_list, list) { | |
1393 | if (list_is_last(&m->list, &smk_net6addr_list)) { | |
1394 | list_add_rcu(&new->list, &m->list); | |
1395 | return; | |
1396 | } | |
1397 | m_next = list_entry_rcu(m->list.next, | |
1398 | struct smk_net6addr, list); | |
1399 | if (new->smk_masks > m_next->smk_masks) { | |
1400 | list_add_rcu(&new->list, &m->list); | |
1401 | return; | |
1402 | } | |
1403 | } | |
1404 | } | |
1405 | ||
1406 | ||
1407 | /** | |
1408 | * smk_write_net6addr - write() for /smack/netlabel | |
1409 | * @file: file pointer, not actually used | |
1410 | * @buf: where to get the data from | |
1411 | * @count: bytes sent | |
1412 | * @ppos: where to start | |
1413 | * | |
1414 | * Accepts only one net6addr per write call. | |
1415 | * Returns number of bytes written or error code, as appropriate | |
1416 | */ | |
1417 | static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, | |
1418 | size_t count, loff_t *ppos) | |
1419 | { | |
1420 | struct smk_net6addr *snp; | |
1421 | struct in6_addr newname; | |
1422 | struct in6_addr fullmask; | |
1423 | struct smack_known *skp = NULL; | |
1424 | char *smack; | |
1425 | char *data; | |
1426 | int rc = 0; | |
1427 | int found = 0; | |
1428 | int i; | |
1429 | unsigned int scanned[8]; | |
1430 | unsigned int m; | |
1431 | unsigned int mask = 128; | |
1432 | ||
1433 | /* | |
1434 | * Must have privilege. | |
1435 | * No partial writes. | |
1436 | * Enough data must be present. | |
1437 | * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" | |
1438 | * "<addr, as a:b:c:d:e:f:g:h><space><label>" | |
1439 | */ | |
1440 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
1441 | return -EPERM; | |
1442 | if (*ppos != 0) | |
1443 | return -EINVAL; | |
7ef4c19d | 1444 | if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
21abb1ec CS |
1445 | return -EINVAL; |
1446 | ||
16e5c1fc AV |
1447 | data = memdup_user_nul(buf, count); |
1448 | if (IS_ERR(data)) | |
1449 | return PTR_ERR(data); | |
21abb1ec CS |
1450 | |
1451 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1452 | if (smack == NULL) { | |
1453 | rc = -ENOMEM; | |
1454 | goto free_data_out; | |
1455 | } | |
1456 | ||
21abb1ec CS |
1457 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s", |
1458 | &scanned[0], &scanned[1], &scanned[2], &scanned[3], | |
1459 | &scanned[4], &scanned[5], &scanned[6], &scanned[7], | |
1460 | &mask, smack); | |
1461 | if (i != 10) { | |
1462 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s", | |
1463 | &scanned[0], &scanned[1], &scanned[2], | |
1464 | &scanned[3], &scanned[4], &scanned[5], | |
1465 | &scanned[6], &scanned[7], smack); | |
1466 | if (i != 9) { | |
1467 | rc = -EINVAL; | |
1468 | goto free_out; | |
1469 | } | |
1470 | } | |
1471 | if (mask > 128) { | |
1472 | rc = -EINVAL; | |
1473 | goto free_out; | |
1474 | } | |
1475 | for (i = 0; i < 8; i++) { | |
1476 | if (scanned[i] > 0xffff) { | |
1477 | rc = -EINVAL; | |
1478 | goto free_out; | |
1479 | } | |
1480 | newname.s6_addr16[i] = htons(scanned[i]); | |
1481 | } | |
1482 | ||
1483 | /* | |
1484 | * If smack begins with '-', it is an option, don't import it | |
1485 | */ | |
1486 | if (smack[0] != '-') { | |
1487 | skp = smk_import_entry(smack, 0); | |
5f2bfe2f LP |
1488 | if (IS_ERR(skp)) { |
1489 | rc = PTR_ERR(skp); | |
21abb1ec CS |
1490 | goto free_out; |
1491 | } | |
1492 | } else { | |
1493 | /* | |
1494 | * Only -DELETE is supported for IPv6 | |
1495 | */ | |
1496 | if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { | |
1497 | rc = -EINVAL; | |
1498 | goto free_out; | |
1499 | } | |
1500 | } | |
1501 | ||
1502 | for (i = 0, m = mask; i < 8; i++) { | |
1503 | if (m >= 16) { | |
1504 | fullmask.s6_addr16[i] = 0xffff; | |
1505 | m -= 16; | |
1506 | } else if (m > 0) { | |
1507 | fullmask.s6_addr16[i] = (1 << m) - 1; | |
1508 | m = 0; | |
1509 | } else | |
1510 | fullmask.s6_addr16[i] = 0; | |
1511 | newname.s6_addr16[i] &= fullmask.s6_addr16[i]; | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * Only allow one writer at a time. Writes should be | |
1516 | * quite rare and small in any case. | |
1517 | */ | |
1518 | mutex_lock(&smk_net6addr_lock); | |
1519 | /* | |
1520 | * Try to find the prefix in the list | |
1521 | */ | |
1522 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
1523 | if (mask != snp->smk_masks) | |
1524 | continue; | |
1525 | for (found = 1, i = 0; i < 8; i++) { | |
1526 | if (newname.s6_addr16[i] != | |
1527 | snp->smk_host.s6_addr16[i]) { | |
1528 | found = 0; | |
1529 | break; | |
1530 | } | |
1531 | } | |
1532 | if (found == 1) | |
1533 | break; | |
1534 | } | |
1535 | if (found == 0) { | |
1536 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); | |
1537 | if (snp == NULL) | |
1538 | rc = -ENOMEM; | |
1539 | else { | |
1540 | snp->smk_host = newname; | |
1541 | snp->smk_mask = fullmask; | |
1542 | snp->smk_masks = mask; | |
1543 | snp->smk_label = skp; | |
1544 | smk_net6addr_insert(snp); | |
1545 | } | |
1546 | } else { | |
1547 | snp->smk_label = skp; | |
1548 | } | |
1549 | ||
1550 | if (rc == 0) | |
1551 | rc = count; | |
1552 | ||
1553 | mutex_unlock(&smk_net6addr_lock); | |
6d3dc07c | 1554 | |
f7112e6c CS |
1555 | free_out: |
1556 | kfree(smack); | |
1557 | free_data_out: | |
1558 | kfree(data); | |
1559 | ||
6d3dc07c CS |
1560 | return rc; |
1561 | } | |
1562 | ||
21abb1ec CS |
1563 | static const struct file_operations smk_net6addr_ops = { |
1564 | .open = smk_open_net6addr, | |
6d3dc07c CS |
1565 | .read = seq_read, |
1566 | .llseek = seq_lseek, | |
21abb1ec | 1567 | .write = smk_write_net6addr, |
6d3dc07c CS |
1568 | .release = seq_release, |
1569 | }; | |
21abb1ec | 1570 | #endif /* CONFIG_IPV6 */ |
6d3dc07c | 1571 | |
e114e473 CS |
1572 | /** |
1573 | * smk_read_doi - read() for /smack/doi | |
1574 | * @filp: file pointer, not actually used | |
1575 | * @buf: where to put the result | |
1576 | * @count: maximum to send along | |
1577 | * @ppos: where to start | |
1578 | * | |
1579 | * Returns number of bytes read or error code, as appropriate | |
1580 | */ | |
1581 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1582 | size_t count, loff_t *ppos) | |
1583 | { | |
1584 | char temp[80]; | |
1585 | ssize_t rc; | |
1586 | ||
1587 | if (*ppos != 0) | |
1588 | return 0; | |
1589 | ||
1590 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1591 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1592 | ||
1593 | return rc; | |
1594 | } | |
1595 | ||
1596 | /** | |
1597 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1598 | * @file: file pointer, not actually used |
e114e473 CS |
1599 | * @buf: where to get the data from |
1600 | * @count: bytes sent | |
1601 | * @ppos: where to start | |
1602 | * | |
1603 | * Returns number of bytes written or error code, as appropriate | |
1604 | */ | |
1605 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1606 | size_t count, loff_t *ppos) | |
1607 | { | |
1608 | char temp[80]; | |
1609 | int i; | |
1610 | ||
1880eff7 | 1611 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1612 | return -EPERM; |
1613 | ||
1614 | if (count >= sizeof(temp) || count == 0) | |
1615 | return -EINVAL; | |
1616 | ||
1617 | if (copy_from_user(temp, buf, count) != 0) | |
1618 | return -EFAULT; | |
1619 | ||
1620 | temp[count] = '\0'; | |
1621 | ||
1622 | if (sscanf(temp, "%d", &i) != 1) | |
1623 | return -EINVAL; | |
1624 | ||
1625 | smk_cipso_doi_value = i; | |
1626 | ||
1627 | smk_cipso_doi(); | |
1628 | ||
1629 | return count; | |
1630 | } | |
1631 | ||
1632 | static const struct file_operations smk_doi_ops = { | |
1633 | .read = smk_read_doi, | |
1634 | .write = smk_write_doi, | |
6038f373 | 1635 | .llseek = default_llseek, |
e114e473 CS |
1636 | }; |
1637 | ||
1638 | /** | |
1639 | * smk_read_direct - read() for /smack/direct | |
1640 | * @filp: file pointer, not actually used | |
1641 | * @buf: where to put the result | |
1642 | * @count: maximum to send along | |
1643 | * @ppos: where to start | |
1644 | * | |
1645 | * Returns number of bytes read or error code, as appropriate | |
1646 | */ | |
1647 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1648 | size_t count, loff_t *ppos) | |
1649 | { | |
1650 | char temp[80]; | |
1651 | ssize_t rc; | |
1652 | ||
1653 | if (*ppos != 0) | |
1654 | return 0; | |
1655 | ||
1656 | sprintf(temp, "%d", smack_cipso_direct); | |
1657 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1658 | ||
1659 | return rc; | |
1660 | } | |
1661 | ||
1662 | /** | |
1663 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1664 | * @file: file pointer, not actually used |
e114e473 CS |
1665 | * @buf: where to get the data from |
1666 | * @count: bytes sent | |
1667 | * @ppos: where to start | |
1668 | * | |
1669 | * Returns number of bytes written or error code, as appropriate | |
1670 | */ | |
1671 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1672 | size_t count, loff_t *ppos) | |
1673 | { | |
f7112e6c | 1674 | struct smack_known *skp; |
e114e473 CS |
1675 | char temp[80]; |
1676 | int i; | |
1677 | ||
1880eff7 | 1678 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1679 | return -EPERM; |
1680 | ||
1681 | if (count >= sizeof(temp) || count == 0) | |
1682 | return -EINVAL; | |
1683 | ||
1684 | if (copy_from_user(temp, buf, count) != 0) | |
1685 | return -EFAULT; | |
1686 | ||
1687 | temp[count] = '\0'; | |
1688 | ||
1689 | if (sscanf(temp, "%d", &i) != 1) | |
1690 | return -EINVAL; | |
1691 | ||
f7112e6c CS |
1692 | /* |
1693 | * Don't do anything if the value hasn't actually changed. | |
1694 | * If it is changing reset the level on entries that were | |
1695 | * set up to be direct when they were created. | |
1696 | */ | |
1697 | if (smack_cipso_direct != i) { | |
1698 | mutex_lock(&smack_known_lock); | |
1699 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1700 | if (skp->smk_netlabel.attr.mls.lvl == | |
1701 | smack_cipso_direct) | |
1702 | skp->smk_netlabel.attr.mls.lvl = i; | |
1703 | smack_cipso_direct = i; | |
1704 | mutex_unlock(&smack_known_lock); | |
1705 | } | |
e114e473 CS |
1706 | |
1707 | return count; | |
1708 | } | |
1709 | ||
1710 | static const struct file_operations smk_direct_ops = { | |
1711 | .read = smk_read_direct, | |
1712 | .write = smk_write_direct, | |
6038f373 | 1713 | .llseek = default_llseek, |
e114e473 CS |
1714 | }; |
1715 | ||
f7112e6c CS |
1716 | /** |
1717 | * smk_read_mapped - read() for /smack/mapped | |
1718 | * @filp: file pointer, not actually used | |
1719 | * @buf: where to put the result | |
1720 | * @count: maximum to send along | |
1721 | * @ppos: where to start | |
1722 | * | |
1723 | * Returns number of bytes read or error code, as appropriate | |
1724 | */ | |
1725 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1726 | size_t count, loff_t *ppos) | |
1727 | { | |
1728 | char temp[80]; | |
1729 | ssize_t rc; | |
1730 | ||
1731 | if (*ppos != 0) | |
1732 | return 0; | |
1733 | ||
1734 | sprintf(temp, "%d", smack_cipso_mapped); | |
1735 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1736 | ||
1737 | return rc; | |
1738 | } | |
1739 | ||
1740 | /** | |
1741 | * smk_write_mapped - write() for /smack/mapped | |
1742 | * @file: file pointer, not actually used | |
1743 | * @buf: where to get the data from | |
1744 | * @count: bytes sent | |
1745 | * @ppos: where to start | |
1746 | * | |
1747 | * Returns number of bytes written or error code, as appropriate | |
1748 | */ | |
1749 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1750 | size_t count, loff_t *ppos) | |
1751 | { | |
1752 | struct smack_known *skp; | |
1753 | char temp[80]; | |
1754 | int i; | |
1755 | ||
1880eff7 | 1756 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1757 | return -EPERM; |
1758 | ||
1759 | if (count >= sizeof(temp) || count == 0) | |
1760 | return -EINVAL; | |
1761 | ||
1762 | if (copy_from_user(temp, buf, count) != 0) | |
1763 | return -EFAULT; | |
1764 | ||
1765 | temp[count] = '\0'; | |
1766 | ||
1767 | if (sscanf(temp, "%d", &i) != 1) | |
1768 | return -EINVAL; | |
1769 | ||
1770 | /* | |
1771 | * Don't do anything if the value hasn't actually changed. | |
1772 | * If it is changing reset the level on entries that were | |
1773 | * set up to be mapped when they were created. | |
1774 | */ | |
1775 | if (smack_cipso_mapped != i) { | |
1776 | mutex_lock(&smack_known_lock); | |
1777 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1778 | if (skp->smk_netlabel.attr.mls.lvl == | |
1779 | smack_cipso_mapped) | |
1780 | skp->smk_netlabel.attr.mls.lvl = i; | |
1781 | smack_cipso_mapped = i; | |
1782 | mutex_unlock(&smack_known_lock); | |
1783 | } | |
1784 | ||
1785 | return count; | |
1786 | } | |
1787 | ||
1788 | static const struct file_operations smk_mapped_ops = { | |
1789 | .read = smk_read_mapped, | |
1790 | .write = smk_write_mapped, | |
1791 | .llseek = default_llseek, | |
1792 | }; | |
1793 | ||
e114e473 CS |
1794 | /** |
1795 | * smk_read_ambient - read() for /smack/ambient | |
1796 | * @filp: file pointer, not actually used | |
1797 | * @buf: where to put the result | |
1798 | * @cn: maximum to send along | |
1799 | * @ppos: where to start | |
1800 | * | |
1801 | * Returns number of bytes read or error code, as appropriate | |
1802 | */ | |
1803 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1804 | size_t cn, loff_t *ppos) | |
1805 | { | |
1806 | ssize_t rc; | |
e114e473 CS |
1807 | int asize; |
1808 | ||
1809 | if (*ppos != 0) | |
1810 | return 0; | |
1811 | /* | |
1812 | * Being careful to avoid a problem in the case where | |
1813 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1814 | */ |
4bc87e62 | 1815 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1816 | |
2f823ff8 | 1817 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1818 | |
1819 | if (cn >= asize) | |
1820 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1821 | smack_net_ambient->smk_known, |
1822 | asize); | |
4bc87e62 CS |
1823 | else |
1824 | rc = -EINVAL; | |
e114e473 | 1825 | |
4bc87e62 | 1826 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1827 | |
1828 | return rc; | |
1829 | } | |
1830 | ||
1831 | /** | |
1832 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1833 | * @file: file pointer, not actually used |
e114e473 CS |
1834 | * @buf: where to get the data from |
1835 | * @count: bytes sent | |
1836 | * @ppos: where to start | |
1837 | * | |
1838 | * Returns number of bytes written or error code, as appropriate | |
1839 | */ | |
1840 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1841 | size_t count, loff_t *ppos) | |
1842 | { | |
2f823ff8 | 1843 | struct smack_known *skp; |
4bc87e62 | 1844 | char *oldambient; |
f7112e6c CS |
1845 | char *data; |
1846 | int rc = count; | |
e114e473 | 1847 | |
1880eff7 | 1848 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1849 | return -EPERM; |
1850 | ||
7ef4c19d ST |
1851 | /* Enough data must be present */ |
1852 | if (count == 0 || count > PAGE_SIZE) | |
1853 | return -EINVAL; | |
1854 | ||
16e5c1fc AV |
1855 | data = memdup_user_nul(buf, count); |
1856 | if (IS_ERR(data)) | |
1857 | return PTR_ERR(data); | |
e114e473 | 1858 | |
2f823ff8 | 1859 | skp = smk_import_entry(data, count); |
e774ad68 LP |
1860 | if (IS_ERR(skp)) { |
1861 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1862 | goto out; |
1863 | } | |
e114e473 | 1864 | |
4bc87e62 CS |
1865 | mutex_lock(&smack_ambient_lock); |
1866 | ||
2f823ff8 CS |
1867 | oldambient = smack_net_ambient->smk_known; |
1868 | smack_net_ambient = skp; | |
4bc87e62 CS |
1869 | smk_unlbl_ambient(oldambient); |
1870 | ||
1871 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1872 | |
f7112e6c CS |
1873 | out: |
1874 | kfree(data); | |
1875 | return rc; | |
e114e473 CS |
1876 | } |
1877 | ||
1878 | static const struct file_operations smk_ambient_ops = { | |
1879 | .read = smk_read_ambient, | |
1880 | .write = smk_write_ambient, | |
6038f373 | 1881 | .llseek = default_llseek, |
e114e473 CS |
1882 | }; |
1883 | ||
c0d77c88 RK |
1884 | /* |
1885 | * Seq_file operations for /smack/onlycap | |
15446235 | 1886 | */ |
c0d77c88 | 1887 | static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
15446235 | 1888 | { |
c0d77c88 RK |
1889 | return smk_seq_start(s, pos, &smack_onlycap_list); |
1890 | } | |
15446235 | 1891 | |
c0d77c88 RK |
1892 | static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1893 | { | |
1894 | return smk_seq_next(s, v, pos, &smack_onlycap_list); | |
1895 | } | |
15446235 | 1896 | |
c0d77c88 RK |
1897 | static int onlycap_seq_show(struct seq_file *s, void *v) |
1898 | { | |
1899 | struct list_head *list = v; | |
38416e53 ZJ |
1900 | struct smack_known_list_elem *sklep = |
1901 | list_entry_rcu(list, struct smack_known_list_elem, list); | |
15446235 | 1902 | |
38416e53 | 1903 | seq_puts(s, sklep->smk_label->smk_known); |
c0d77c88 | 1904 | seq_putc(s, ' '); |
15446235 | 1905 | |
c0d77c88 RK |
1906 | return 0; |
1907 | } | |
15446235 | 1908 | |
c0d77c88 RK |
1909 | static const struct seq_operations onlycap_seq_ops = { |
1910 | .start = onlycap_seq_start, | |
1911 | .next = onlycap_seq_next, | |
1912 | .show = onlycap_seq_show, | |
1913 | .stop = smk_seq_stop, | |
1914 | }; | |
1915 | ||
1916 | static int smk_open_onlycap(struct inode *inode, struct file *file) | |
1917 | { | |
1918 | return seq_open(file, &onlycap_seq_ops); | |
1919 | } | |
1920 | ||
1921 | /** | |
1922 | * smk_list_swap_rcu - swap public list with a private one in RCU-safe way | |
1923 | * The caller must hold appropriate mutex to prevent concurrent modifications | |
1924 | * to the public list. | |
1925 | * Private list is assumed to be not accessible to other threads yet. | |
1926 | * | |
1927 | * @public: public list | |
1928 | * @private: private list | |
1929 | */ | |
1930 | static void smk_list_swap_rcu(struct list_head *public, | |
1931 | struct list_head *private) | |
1932 | { | |
1933 | struct list_head *first, *last; | |
1934 | ||
1935 | if (list_empty(public)) { | |
1936 | list_splice_init_rcu(private, public, synchronize_rcu); | |
1937 | } else { | |
1938 | /* Remember public list before replacing it */ | |
1939 | first = public->next; | |
1940 | last = public->prev; | |
1941 | ||
1942 | /* Publish private list in place of public in RCU-safe way */ | |
1943 | private->prev->next = public; | |
1944 | private->next->prev = public; | |
1945 | rcu_assign_pointer(public->next, private->next); | |
1946 | public->prev = private->prev; | |
1947 | ||
1948 | synchronize_rcu(); | |
1949 | ||
1950 | /* When all readers are done with the old public list, | |
1951 | * attach it in place of private */ | |
1952 | private->next = first; | |
1953 | private->prev = last; | |
1954 | first->prev = private; | |
1955 | last->next = private; | |
1956 | } | |
15446235 CS |
1957 | } |
1958 | ||
38416e53 ZJ |
1959 | /** |
1960 | * smk_parse_label_list - parse list of Smack labels, separated by spaces | |
1961 | * | |
1962 | * @data: the string to parse | |
7da31b85 | 1963 | * @list: destination list |
38416e53 ZJ |
1964 | * |
1965 | * Returns zero on success or error code, as appropriate | |
1966 | */ | |
1967 | static int smk_parse_label_list(char *data, struct list_head *list) | |
1968 | { | |
1969 | char *tok; | |
1970 | struct smack_known *skp; | |
1971 | struct smack_known_list_elem *sklep; | |
1972 | ||
1973 | while ((tok = strsep(&data, " ")) != NULL) { | |
1974 | if (!*tok) | |
1975 | continue; | |
1976 | ||
1977 | skp = smk_import_entry(tok, 0); | |
1978 | if (IS_ERR(skp)) | |
1979 | return PTR_ERR(skp); | |
1980 | ||
1981 | sklep = kzalloc(sizeof(*sklep), GFP_KERNEL); | |
1982 | if (sklep == NULL) | |
1983 | return -ENOMEM; | |
1984 | ||
1985 | sklep->smk_label = skp; | |
1986 | list_add(&sklep->list, list); | |
1987 | } | |
1988 | ||
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | /** | |
1993 | * smk_destroy_label_list - destroy a list of smack_known_list_elem | |
7da31b85 | 1994 | * @list: header pointer of the list to destroy |
38416e53 ZJ |
1995 | */ |
1996 | void smk_destroy_label_list(struct list_head *list) | |
1997 | { | |
1998 | struct smack_known_list_elem *sklep; | |
1999 | struct smack_known_list_elem *sklep2; | |
2000 | ||
2001 | list_for_each_entry_safe(sklep, sklep2, list, list) | |
2002 | kfree(sklep); | |
2003 | ||
2004 | INIT_LIST_HEAD(list); | |
2005 | } | |
2006 | ||
15446235 | 2007 | /** |
00f84f3f | 2008 | * smk_write_onlycap - write() for smackfs/onlycap |
251a2a95 | 2009 | * @file: file pointer, not actually used |
15446235 CS |
2010 | * @buf: where to get the data from |
2011 | * @count: bytes sent | |
2012 | * @ppos: where to start | |
2013 | * | |
2014 | * Returns number of bytes written or error code, as appropriate | |
2015 | */ | |
2016 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
2017 | size_t count, loff_t *ppos) | |
2018 | { | |
f7112e6c | 2019 | char *data; |
c0d77c88 | 2020 | LIST_HEAD(list_tmp); |
38416e53 | 2021 | int rc; |
15446235 | 2022 | |
1880eff7 | 2023 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
2024 | return -EPERM; |
2025 | ||
7ef4c19d ST |
2026 | if (count > PAGE_SIZE) |
2027 | return -EINVAL; | |
2028 | ||
16e5c1fc AV |
2029 | data = memdup_user_nul(buf, count); |
2030 | if (IS_ERR(data)) | |
2031 | return PTR_ERR(data); | |
e774ad68 | 2032 | |
38416e53 | 2033 | rc = smk_parse_label_list(data, &list_tmp); |
c0d77c88 RK |
2034 | kfree(data); |
2035 | ||
15446235 | 2036 | /* |
e774ad68 LP |
2037 | * Clear the smack_onlycap on invalid label errors. This means |
2038 | * that we can pass a null string to unset the onlycap value. | |
f7112e6c | 2039 | * |
e774ad68 | 2040 | * Importing will also reject a label beginning with '-', |
f7112e6c | 2041 | * so "-usecapabilities" will also work. |
e774ad68 LP |
2042 | * |
2043 | * But do so only on invalid label, not on system errors. | |
c0d77c88 | 2044 | * The invalid label must be first to count as clearing attempt. |
15446235 | 2045 | */ |
38416e53 | 2046 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { |
c0d77c88 RK |
2047 | mutex_lock(&smack_onlycap_lock); |
2048 | smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); | |
2049 | mutex_unlock(&smack_onlycap_lock); | |
38416e53 | 2050 | rc = count; |
e774ad68 LP |
2051 | } |
2052 | ||
38416e53 | 2053 | smk_destroy_label_list(&list_tmp); |
15446235 | 2054 | |
f7112e6c | 2055 | return rc; |
15446235 CS |
2056 | } |
2057 | ||
2058 | static const struct file_operations smk_onlycap_ops = { | |
c0d77c88 RK |
2059 | .open = smk_open_onlycap, |
2060 | .read = seq_read, | |
15446235 | 2061 | .write = smk_write_onlycap, |
c0d77c88 RK |
2062 | .llseek = seq_lseek, |
2063 | .release = seq_release, | |
15446235 CS |
2064 | }; |
2065 | ||
bf4b2fee CS |
2066 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2067 | /** | |
2068 | * smk_read_unconfined - read() for smackfs/unconfined | |
2069 | * @filp: file pointer, not actually used | |
2070 | * @buf: where to put the result | |
2071 | * @cn: maximum to send along | |
2072 | * @ppos: where to start | |
2073 | * | |
2074 | * Returns number of bytes read or error code, as appropriate | |
2075 | */ | |
2076 | static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, | |
2077 | size_t cn, loff_t *ppos) | |
2078 | { | |
2079 | char *smack = ""; | |
2080 | ssize_t rc = -EINVAL; | |
2081 | int asize; | |
2082 | ||
2083 | if (*ppos != 0) | |
2084 | return 0; | |
2085 | ||
2086 | if (smack_unconfined != NULL) | |
2087 | smack = smack_unconfined->smk_known; | |
2088 | ||
2089 | asize = strlen(smack) + 1; | |
2090 | ||
2091 | if (cn >= asize) | |
2092 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
2093 | ||
2094 | return rc; | |
2095 | } | |
2096 | ||
2097 | /** | |
2098 | * smk_write_unconfined - write() for smackfs/unconfined | |
2099 | * @file: file pointer, not actually used | |
2100 | * @buf: where to get the data from | |
2101 | * @count: bytes sent | |
2102 | * @ppos: where to start | |
2103 | * | |
2104 | * Returns number of bytes written or error code, as appropriate | |
2105 | */ | |
2106 | static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, | |
2107 | size_t count, loff_t *ppos) | |
2108 | { | |
2109 | char *data; | |
e774ad68 | 2110 | struct smack_known *skp; |
bf4b2fee CS |
2111 | int rc = count; |
2112 | ||
2113 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2114 | return -EPERM; | |
2115 | ||
7ef4c19d ST |
2116 | if (count > PAGE_SIZE) |
2117 | return -EINVAL; | |
2118 | ||
16e5c1fc AV |
2119 | data = memdup_user_nul(buf, count); |
2120 | if (IS_ERR(data)) | |
2121 | return PTR_ERR(data); | |
e774ad68 | 2122 | |
bf4b2fee | 2123 | /* |
e774ad68 LP |
2124 | * Clear the smack_unconfined on invalid label errors. This means |
2125 | * that we can pass a null string to unset the unconfined value. | |
bf4b2fee | 2126 | * |
e774ad68 | 2127 | * Importing will also reject a label beginning with '-', |
bf4b2fee | 2128 | * so "-confine" will also work. |
e774ad68 LP |
2129 | * |
2130 | * But do so only on invalid label, not on system errors. | |
bf4b2fee | 2131 | */ |
e774ad68 LP |
2132 | skp = smk_import_entry(data, count); |
2133 | if (PTR_ERR(skp) == -EINVAL) | |
2134 | skp = NULL; | |
2135 | else if (IS_ERR(skp)) { | |
2136 | rc = PTR_ERR(skp); | |
2137 | goto freeout; | |
2138 | } | |
2139 | ||
2140 | smack_unconfined = skp; | |
bf4b2fee | 2141 | |
e774ad68 | 2142 | freeout: |
bf4b2fee CS |
2143 | kfree(data); |
2144 | return rc; | |
2145 | } | |
2146 | ||
2147 | static const struct file_operations smk_unconfined_ops = { | |
2148 | .read = smk_read_unconfined, | |
2149 | .write = smk_write_unconfined, | |
2150 | .llseek = default_llseek, | |
2151 | }; | |
2152 | #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ | |
2153 | ||
ecfcc53f EB |
2154 | /** |
2155 | * smk_read_logging - read() for /smack/logging | |
2156 | * @filp: file pointer, not actually used | |
2157 | * @buf: where to put the result | |
7da31b85 | 2158 | * @count: maximum to send along |
ecfcc53f EB |
2159 | * @ppos: where to start |
2160 | * | |
2161 | * Returns number of bytes read or error code, as appropriate | |
2162 | */ | |
2163 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
2164 | size_t count, loff_t *ppos) | |
2165 | { | |
2166 | char temp[32]; | |
2167 | ssize_t rc; | |
2168 | ||
2169 | if (*ppos != 0) | |
2170 | return 0; | |
2171 | ||
2172 | sprintf(temp, "%d\n", log_policy); | |
2173 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2174 | return rc; | |
2175 | } | |
2176 | ||
2177 | /** | |
2178 | * smk_write_logging - write() for /smack/logging | |
2179 | * @file: file pointer, not actually used | |
2180 | * @buf: where to get the data from | |
2181 | * @count: bytes sent | |
2182 | * @ppos: where to start | |
2183 | * | |
2184 | * Returns number of bytes written or error code, as appropriate | |
2185 | */ | |
2186 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
2187 | size_t count, loff_t *ppos) | |
2188 | { | |
2189 | char temp[32]; | |
2190 | int i; | |
2191 | ||
1880eff7 | 2192 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
2193 | return -EPERM; |
2194 | ||
2195 | if (count >= sizeof(temp) || count == 0) | |
2196 | return -EINVAL; | |
2197 | ||
2198 | if (copy_from_user(temp, buf, count) != 0) | |
2199 | return -EFAULT; | |
2200 | ||
2201 | temp[count] = '\0'; | |
2202 | ||
2203 | if (sscanf(temp, "%d", &i) != 1) | |
2204 | return -EINVAL; | |
2205 | if (i < 0 || i > 3) | |
2206 | return -EINVAL; | |
2207 | log_policy = i; | |
2208 | return count; | |
2209 | } | |
2210 | ||
2211 | ||
2212 | ||
2213 | static const struct file_operations smk_logging_ops = { | |
2214 | .read = smk_read_logging, | |
2215 | .write = smk_write_logging, | |
6038f373 | 2216 | .llseek = default_llseek, |
ecfcc53f | 2217 | }; |
7898e1f8 CS |
2218 | |
2219 | /* | |
2220 | * Seq_file read operations for /smack/load-self | |
2221 | */ | |
2222 | ||
2223 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
2224 | { | |
b17103a8 | 2225 | struct task_smack *tsp = smack_cred(current_cred()); |
7898e1f8 | 2226 | |
40809565 | 2227 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
2228 | } |
2229 | ||
2230 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2231 | { | |
b17103a8 | 2232 | struct task_smack *tsp = smack_cred(current_cred()); |
7898e1f8 | 2233 | |
40809565 | 2234 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
2235 | } |
2236 | ||
2237 | static int load_self_seq_show(struct seq_file *s, void *v) | |
2238 | { | |
2239 | struct list_head *list = v; | |
2240 | struct smack_rule *srp = | |
01fa8474 | 2241 | list_entry_rcu(list, struct smack_rule, list); |
7898e1f8 | 2242 | |
f7112e6c | 2243 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
2244 | |
2245 | return 0; | |
2246 | } | |
2247 | ||
7898e1f8 CS |
2248 | static const struct seq_operations load_self_seq_ops = { |
2249 | .start = load_self_seq_start, | |
2250 | .next = load_self_seq_next, | |
2251 | .show = load_self_seq_show, | |
40809565 | 2252 | .stop = smk_seq_stop, |
7898e1f8 CS |
2253 | }; |
2254 | ||
2255 | ||
2256 | /** | |
f7112e6c | 2257 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
2258 | * @inode: inode structure representing file |
2259 | * @file: "load" file pointer | |
2260 | * | |
2261 | * For reading, use load_seq_* seq_file reading operations. | |
2262 | */ | |
2263 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
2264 | { | |
2265 | return seq_open(file, &load_self_seq_ops); | |
2266 | } | |
2267 | ||
2268 | /** | |
2269 | * smk_write_load_self - write() for /smack/load-self | |
2270 | * @file: file pointer, not actually used | |
2271 | * @buf: where to get the data from | |
2272 | * @count: bytes sent | |
2273 | * @ppos: where to start - must be 0 | |
2274 | * | |
2275 | */ | |
2276 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
2277 | size_t count, loff_t *ppos) | |
2278 | { | |
b17103a8 | 2279 | struct task_smack *tsp = smack_cred(current_cred()); |
7898e1f8 | 2280 | |
f7112e6c CS |
2281 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
2282 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
2283 | } |
2284 | ||
2285 | static const struct file_operations smk_load_self_ops = { | |
2286 | .open = smk_open_load_self, | |
2287 | .read = seq_read, | |
2288 | .llseek = seq_lseek, | |
2289 | .write = smk_write_load_self, | |
2290 | .release = seq_release, | |
2291 | }; | |
828716c2 JS |
2292 | |
2293 | /** | |
f7112e6c | 2294 | * smk_user_access - handle access check transaction |
828716c2 JS |
2295 | * @file: file pointer |
2296 | * @buf: data from user space | |
2297 | * @count: bytes sent | |
2298 | * @ppos: where to start - must be 0 | |
7da31b85 | 2299 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 | 2300 | */ |
f7112e6c CS |
2301 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
2302 | size_t count, loff_t *ppos, int format) | |
828716c2 | 2303 | { |
e05b6f98 | 2304 | struct smack_parsed_rule rule; |
828716c2 | 2305 | char *data; |
f8859d98 | 2306 | int res; |
828716c2 | 2307 | |
828716c2 JS |
2308 | data = simple_transaction_get(file, buf, count); |
2309 | if (IS_ERR(data)) | |
2310 | return PTR_ERR(data); | |
2311 | ||
f7112e6c CS |
2312 | if (format == SMK_FIXED24_FMT) { |
2313 | if (count < SMK_LOADLEN) | |
2314 | return -EINVAL; | |
2315 | res = smk_parse_rule(data, &rule, 0); | |
2316 | } else { | |
2317 | /* | |
10289b0f | 2318 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 2319 | */ |
10289b0f | 2320 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
2321 | } |
2322 | ||
398ce073 JS |
2323 | if (res >= 0) |
2324 | res = smk_access(rule.smk_subject, rule.smk_object, | |
2325 | rule.smk_access1, NULL); | |
2326 | else if (res != -ENOENT) | |
e774ad68 | 2327 | return res; |
828716c2 | 2328 | |
d166c802 CS |
2329 | /* |
2330 | * smk_access() can return a value > 0 in the "bringup" case. | |
2331 | */ | |
2332 | data[0] = res >= 0 ? '1' : '0'; | |
f8859d98 | 2333 | data[1] = '\0'; |
828716c2 | 2334 | |
d86b2b61 | 2335 | simple_transaction_set(file, 2); |
f7112e6c CS |
2336 | |
2337 | if (format == SMK_FIXED24_FMT) | |
2338 | return SMK_LOADLEN; | |
2339 | return count; | |
2340 | } | |
2341 | ||
2342 | /** | |
2343 | * smk_write_access - handle access check transaction | |
2344 | * @file: file pointer | |
2345 | * @buf: data from user space | |
2346 | * @count: bytes sent | |
2347 | * @ppos: where to start - must be 0 | |
2348 | */ | |
2349 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
2350 | size_t count, loff_t *ppos) | |
2351 | { | |
2352 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
2353 | } |
2354 | ||
2355 | static const struct file_operations smk_access_ops = { | |
2356 | .write = smk_write_access, | |
2357 | .read = simple_transaction_read, | |
2358 | .release = simple_transaction_release, | |
2359 | .llseek = generic_file_llseek, | |
2360 | }; | |
2361 | ||
f7112e6c CS |
2362 | |
2363 | /* | |
2364 | * Seq_file read operations for /smack/load2 | |
2365 | */ | |
2366 | ||
2367 | static int load2_seq_show(struct seq_file *s, void *v) | |
2368 | { | |
2369 | struct list_head *list = v; | |
460d95a1 VG |
2370 | struct smack_rule *srp; |
2371 | struct smack_known *skp = | |
2372 | list_entry_rcu(list, struct smack_known, list); | |
f7112e6c | 2373 | |
460d95a1 VG |
2374 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) |
2375 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
f7112e6c CS |
2376 | |
2377 | return 0; | |
2378 | } | |
2379 | ||
2380 | static const struct seq_operations load2_seq_ops = { | |
2381 | .start = load2_seq_start, | |
2382 | .next = load2_seq_next, | |
2383 | .show = load2_seq_show, | |
2384 | .stop = smk_seq_stop, | |
2385 | }; | |
2386 | ||
2387 | /** | |
2388 | * smk_open_load2 - open() for /smack/load2 | |
2389 | * @inode: inode structure representing file | |
2390 | * @file: "load2" file pointer | |
2391 | * | |
2392 | * For reading, use load2_seq_* seq_file reading operations. | |
2393 | */ | |
2394 | static int smk_open_load2(struct inode *inode, struct file *file) | |
2395 | { | |
2396 | return seq_open(file, &load2_seq_ops); | |
2397 | } | |
2398 | ||
2399 | /** | |
2400 | * smk_write_load2 - write() for /smack/load2 | |
2401 | * @file: file pointer, not actually used | |
2402 | * @buf: where to get the data from | |
2403 | * @count: bytes sent | |
2404 | * @ppos: where to start - must be 0 | |
2405 | * | |
2406 | */ | |
2407 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
2408 | size_t count, loff_t *ppos) | |
2409 | { | |
2410 | /* | |
2411 | * Must have privilege. | |
2412 | */ | |
1880eff7 | 2413 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
2414 | return -EPERM; |
2415 | ||
2416 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2417 | SMK_LONG_FMT); | |
2418 | } | |
2419 | ||
2420 | static const struct file_operations smk_load2_ops = { | |
2421 | .open = smk_open_load2, | |
2422 | .read = seq_read, | |
2423 | .llseek = seq_lseek, | |
2424 | .write = smk_write_load2, | |
2425 | .release = seq_release, | |
2426 | }; | |
2427 | ||
2428 | /* | |
2429 | * Seq_file read operations for /smack/load-self2 | |
2430 | */ | |
2431 | ||
2432 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
2433 | { | |
b17103a8 | 2434 | struct task_smack *tsp = smack_cred(current_cred()); |
f7112e6c CS |
2435 | |
2436 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
2437 | } | |
2438 | ||
2439 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2440 | { | |
b17103a8 | 2441 | struct task_smack *tsp = smack_cred(current_cred()); |
f7112e6c CS |
2442 | |
2443 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
2444 | } | |
2445 | ||
2446 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
2447 | { | |
2448 | struct list_head *list = v; | |
2449 | struct smack_rule *srp = | |
01fa8474 | 2450 | list_entry_rcu(list, struct smack_rule, list); |
f7112e6c CS |
2451 | |
2452 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
2453 | ||
2454 | return 0; | |
2455 | } | |
2456 | ||
2457 | static const struct seq_operations load_self2_seq_ops = { | |
2458 | .start = load_self2_seq_start, | |
2459 | .next = load_self2_seq_next, | |
2460 | .show = load_self2_seq_show, | |
2461 | .stop = smk_seq_stop, | |
2462 | }; | |
2463 | ||
2464 | /** | |
2465 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2466 | * @inode: inode structure representing file | |
2467 | * @file: "load" file pointer | |
2468 | * | |
2469 | * For reading, use load_seq_* seq_file reading operations. | |
2470 | */ | |
2471 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2472 | { | |
2473 | return seq_open(file, &load_self2_seq_ops); | |
2474 | } | |
2475 | ||
2476 | /** | |
2477 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2478 | * @file: file pointer, not actually used | |
2479 | * @buf: where to get the data from | |
2480 | * @count: bytes sent | |
2481 | * @ppos: where to start - must be 0 | |
2482 | * | |
2483 | */ | |
2484 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2485 | size_t count, loff_t *ppos) | |
2486 | { | |
b17103a8 | 2487 | struct task_smack *tsp = smack_cred(current_cred()); |
f7112e6c CS |
2488 | |
2489 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2490 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2491 | } | |
2492 | ||
2493 | static const struct file_operations smk_load_self2_ops = { | |
2494 | .open = smk_open_load_self2, | |
2495 | .read = seq_read, | |
2496 | .llseek = seq_lseek, | |
2497 | .write = smk_write_load_self2, | |
2498 | .release = seq_release, | |
2499 | }; | |
2500 | ||
2501 | /** | |
2502 | * smk_write_access2 - handle access check transaction | |
2503 | * @file: file pointer | |
2504 | * @buf: data from user space | |
2505 | * @count: bytes sent | |
2506 | * @ppos: where to start - must be 0 | |
2507 | */ | |
2508 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2509 | size_t count, loff_t *ppos) | |
2510 | { | |
2511 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2512 | } | |
2513 | ||
2514 | static const struct file_operations smk_access2_ops = { | |
2515 | .write = smk_write_access2, | |
2516 | .read = simple_transaction_read, | |
2517 | .release = simple_transaction_release, | |
2518 | .llseek = generic_file_llseek, | |
2519 | }; | |
2520 | ||
449543b0 RK |
2521 | /** |
2522 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2523 | * @file: file pointer | |
2524 | * @buf: data from user space | |
2525 | * @count: bytes sent | |
2526 | * @ppos: where to start - must be 0 | |
2527 | */ | |
2528 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2529 | size_t count, loff_t *ppos) | |
2530 | { | |
54302094 DC |
2531 | char *data; |
2532 | const char *cp; | |
449543b0 RK |
2533 | struct smack_known *skp; |
2534 | struct smack_rule *sp; | |
2535 | struct list_head *rule_list; | |
2536 | struct mutex *rule_lock; | |
2537 | int rc = count; | |
2538 | ||
2539 | if (*ppos != 0) | |
2540 | return -EINVAL; | |
2541 | ||
2542 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2543 | return -EPERM; | |
2544 | ||
2545 | if (count == 0 || count > SMK_LONGLABEL) | |
2546 | return -EINVAL; | |
2547 | ||
63e24c49 ME |
2548 | data = memdup_user(buf, count); |
2549 | if (IS_ERR(data)) | |
2550 | return PTR_ERR(data); | |
449543b0 RK |
2551 | |
2552 | cp = smk_parse_smack(data, count); | |
e774ad68 LP |
2553 | if (IS_ERR(cp)) { |
2554 | rc = PTR_ERR(cp); | |
54302094 | 2555 | goto out_data; |
449543b0 RK |
2556 | } |
2557 | ||
2558 | skp = smk_find_entry(cp); | |
d15d9fad | 2559 | if (skp == NULL) |
54302094 | 2560 | goto out_cp; |
449543b0 RK |
2561 | |
2562 | rule_list = &skp->smk_rules; | |
2563 | rule_lock = &skp->smk_rules_lock; | |
2564 | ||
2565 | mutex_lock(rule_lock); | |
2566 | ||
2567 | list_for_each_entry_rcu(sp, rule_list, list) | |
2568 | sp->smk_access = 0; | |
2569 | ||
2570 | mutex_unlock(rule_lock); | |
2571 | ||
54302094 | 2572 | out_cp: |
449543b0 | 2573 | kfree(cp); |
54302094 DC |
2574 | out_data: |
2575 | kfree(data); | |
2576 | ||
449543b0 RK |
2577 | return rc; |
2578 | } | |
2579 | ||
2580 | static const struct file_operations smk_revoke_subj_ops = { | |
2581 | .write = smk_write_revoke_subj, | |
2582 | .read = simple_transaction_read, | |
2583 | .release = simple_transaction_release, | |
2584 | .llseek = generic_file_llseek, | |
2585 | }; | |
2586 | ||
e9307237 CS |
2587 | /** |
2588 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2589 | * | |
2590 | */ | |
2591 | static int smk_init_sysfs(void) | |
2592 | { | |
ca70d27e | 2593 | return sysfs_create_mount_point(fs_kobj, "smackfs"); |
e9307237 CS |
2594 | } |
2595 | ||
e05b6f98 RK |
2596 | /** |
2597 | * smk_write_change_rule - write() for /smack/change-rule | |
2598 | * @file: file pointer | |
2599 | * @buf: data from user space | |
2600 | * @count: bytes sent | |
2601 | * @ppos: where to start - must be 0 | |
2602 | */ | |
2603 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2604 | size_t count, loff_t *ppos) | |
2605 | { | |
2606 | /* | |
2607 | * Must have privilege. | |
2608 | */ | |
4afde48b | 2609 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e05b6f98 RK |
2610 | return -EPERM; |
2611 | ||
2612 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2613 | SMK_CHANGE_FMT); | |
2614 | } | |
2615 | ||
2616 | static const struct file_operations smk_change_rule_ops = { | |
2617 | .write = smk_write_change_rule, | |
2618 | .read = simple_transaction_read, | |
2619 | .release = simple_transaction_release, | |
2620 | .llseek = generic_file_llseek, | |
2621 | }; | |
2622 | ||
e114e473 | 2623 | /** |
00f84f3f CS |
2624 | * smk_read_syslog - read() for smackfs/syslog |
2625 | * @filp: file pointer, not actually used | |
2626 | * @buf: where to put the result | |
2627 | * @cn: maximum to send along | |
2628 | * @ppos: where to start | |
2629 | * | |
2630 | * Returns number of bytes read or error code, as appropriate | |
2631 | */ | |
2632 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, | |
2633 | size_t cn, loff_t *ppos) | |
2634 | { | |
2635 | struct smack_known *skp; | |
2636 | ssize_t rc = -EINVAL; | |
2637 | int asize; | |
2638 | ||
2639 | if (*ppos != 0) | |
2640 | return 0; | |
2641 | ||
2642 | if (smack_syslog_label == NULL) | |
2643 | skp = &smack_known_star; | |
2644 | else | |
2645 | skp = smack_syslog_label; | |
2646 | ||
2647 | asize = strlen(skp->smk_known) + 1; | |
2648 | ||
2649 | if (cn >= asize) | |
2650 | rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, | |
2651 | asize); | |
2652 | ||
2653 | return rc; | |
2654 | } | |
2655 | ||
2656 | /** | |
2657 | * smk_write_syslog - write() for smackfs/syslog | |
2658 | * @file: file pointer, not actually used | |
2659 | * @buf: where to get the data from | |
2660 | * @count: bytes sent | |
2661 | * @ppos: where to start | |
2662 | * | |
2663 | * Returns number of bytes written or error code, as appropriate | |
2664 | */ | |
2665 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, | |
2666 | size_t count, loff_t *ppos) | |
2667 | { | |
2668 | char *data; | |
2669 | struct smack_known *skp; | |
2670 | int rc = count; | |
2671 | ||
2672 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2673 | return -EPERM; | |
2674 | ||
7ef4c19d ST |
2675 | /* Enough data must be present */ |
2676 | if (count == 0 || count > PAGE_SIZE) | |
2677 | return -EINVAL; | |
2678 | ||
16e5c1fc AV |
2679 | data = memdup_user_nul(buf, count); |
2680 | if (IS_ERR(data)) | |
2681 | return PTR_ERR(data); | |
00f84f3f | 2682 | |
16e5c1fc AV |
2683 | skp = smk_import_entry(data, count); |
2684 | if (IS_ERR(skp)) | |
2685 | rc = PTR_ERR(skp); | |
2686 | else | |
2687 | smack_syslog_label = skp; | |
00f84f3f CS |
2688 | |
2689 | kfree(data); | |
2690 | return rc; | |
2691 | } | |
2692 | ||
2693 | static const struct file_operations smk_syslog_ops = { | |
2694 | .read = smk_read_syslog, | |
2695 | .write = smk_write_syslog, | |
2696 | .llseek = default_llseek, | |
2697 | }; | |
2698 | ||
38416e53 ZJ |
2699 | /* |
2700 | * Seq_file read operations for /smack/relabel-self | |
2701 | */ | |
2702 | ||
2703 | static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos) | |
2704 | { | |
b17103a8 | 2705 | struct task_smack *tsp = smack_cred(current_cred()); |
38416e53 ZJ |
2706 | |
2707 | return smk_seq_start(s, pos, &tsp->smk_relabel); | |
2708 | } | |
2709 | ||
2710 | static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2711 | { | |
b17103a8 | 2712 | struct task_smack *tsp = smack_cred(current_cred()); |
38416e53 ZJ |
2713 | |
2714 | return smk_seq_next(s, v, pos, &tsp->smk_relabel); | |
2715 | } | |
2716 | ||
2717 | static int relabel_self_seq_show(struct seq_file *s, void *v) | |
2718 | { | |
2719 | struct list_head *list = v; | |
2720 | struct smack_known_list_elem *sklep = | |
2721 | list_entry(list, struct smack_known_list_elem, list); | |
2722 | ||
2723 | seq_puts(s, sklep->smk_label->smk_known); | |
2724 | seq_putc(s, ' '); | |
2725 | ||
2726 | return 0; | |
2727 | } | |
2728 | ||
2729 | static const struct seq_operations relabel_self_seq_ops = { | |
2730 | .start = relabel_self_seq_start, | |
2731 | .next = relabel_self_seq_next, | |
2732 | .show = relabel_self_seq_show, | |
2733 | .stop = smk_seq_stop, | |
2734 | }; | |
2735 | ||
2736 | /** | |
2737 | * smk_open_relabel_self - open() for /smack/relabel-self | |
2738 | * @inode: inode structure representing file | |
2739 | * @file: "relabel-self" file pointer | |
2740 | * | |
2741 | * Connect our relabel_self_seq_* operations with /smack/relabel-self | |
2742 | * file_operations | |
2743 | */ | |
2744 | static int smk_open_relabel_self(struct inode *inode, struct file *file) | |
2745 | { | |
2746 | return seq_open(file, &relabel_self_seq_ops); | |
2747 | } | |
2748 | ||
2749 | /** | |
2750 | * smk_write_relabel_self - write() for /smack/relabel-self | |
2751 | * @file: file pointer, not actually used | |
2752 | * @buf: where to get the data from | |
2753 | * @count: bytes sent | |
2754 | * @ppos: where to start - must be 0 | |
2755 | * | |
2756 | */ | |
2757 | static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, | |
2758 | size_t count, loff_t *ppos) | |
2759 | { | |
38416e53 ZJ |
2760 | char *data; |
2761 | int rc; | |
2762 | LIST_HEAD(list_tmp); | |
2763 | ||
2764 | /* | |
2765 | * Must have privilege. | |
2766 | */ | |
2767 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2768 | return -EPERM; | |
2769 | ||
2770 | /* | |
7ef4c19d | 2771 | * No partial write. |
38416e53 ZJ |
2772 | * Enough data must be present. |
2773 | */ | |
2774 | if (*ppos != 0) | |
2775 | return -EINVAL; | |
7ef4c19d ST |
2776 | if (count == 0 || count > PAGE_SIZE) |
2777 | return -EINVAL; | |
38416e53 | 2778 | |
16e5c1fc AV |
2779 | data = memdup_user_nul(buf, count); |
2780 | if (IS_ERR(data)) | |
2781 | return PTR_ERR(data); | |
38416e53 ZJ |
2782 | |
2783 | rc = smk_parse_label_list(data, &list_tmp); | |
2784 | kfree(data); | |
2785 | ||
2786 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { | |
beb4ee67 EB |
2787 | struct cred *new; |
2788 | struct task_smack *tsp; | |
2789 | ||
2790 | new = prepare_creds(); | |
2791 | if (!new) { | |
2792 | rc = -ENOMEM; | |
2793 | goto out; | |
2794 | } | |
2795 | tsp = smack_cred(new); | |
38416e53 ZJ |
2796 | smk_destroy_label_list(&tsp->smk_relabel); |
2797 | list_splice(&list_tmp, &tsp->smk_relabel); | |
beb4ee67 | 2798 | commit_creds(new); |
38416e53 ZJ |
2799 | return count; |
2800 | } | |
beb4ee67 | 2801 | out: |
38416e53 ZJ |
2802 | smk_destroy_label_list(&list_tmp); |
2803 | return rc; | |
2804 | } | |
2805 | ||
2806 | static const struct file_operations smk_relabel_self_ops = { | |
2807 | .open = smk_open_relabel_self, | |
2808 | .read = seq_read, | |
2809 | .llseek = seq_lseek, | |
2810 | .write = smk_write_relabel_self, | |
2811 | .release = seq_release, | |
2812 | }; | |
00f84f3f | 2813 | |
66867818 LP |
2814 | /** |
2815 | * smk_read_ptrace - read() for /smack/ptrace | |
2816 | * @filp: file pointer, not actually used | |
2817 | * @buf: where to put the result | |
2818 | * @count: maximum to send along | |
2819 | * @ppos: where to start | |
2820 | * | |
2821 | * Returns number of bytes read or error code, as appropriate | |
2822 | */ | |
2823 | static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, | |
2824 | size_t count, loff_t *ppos) | |
2825 | { | |
2826 | char temp[32]; | |
2827 | ssize_t rc; | |
2828 | ||
2829 | if (*ppos != 0) | |
2830 | return 0; | |
2831 | ||
2832 | sprintf(temp, "%d\n", smack_ptrace_rule); | |
2833 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2834 | return rc; | |
2835 | } | |
2836 | ||
2837 | /** | |
2838 | * smk_write_ptrace - write() for /smack/ptrace | |
2839 | * @file: file pointer | |
2840 | * @buf: data from user space | |
2841 | * @count: bytes sent | |
2842 | * @ppos: where to start - must be 0 | |
2843 | */ | |
2844 | static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, | |
2845 | size_t count, loff_t *ppos) | |
2846 | { | |
2847 | char temp[32]; | |
2848 | int i; | |
2849 | ||
2850 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2851 | return -EPERM; | |
2852 | ||
2853 | if (*ppos != 0 || count >= sizeof(temp) || count == 0) | |
2854 | return -EINVAL; | |
2855 | ||
2856 | if (copy_from_user(temp, buf, count) != 0) | |
2857 | return -EFAULT; | |
2858 | ||
2859 | temp[count] = '\0'; | |
2860 | ||
2861 | if (sscanf(temp, "%d", &i) != 1) | |
2862 | return -EINVAL; | |
2863 | if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) | |
2864 | return -EINVAL; | |
2865 | smack_ptrace_rule = i; | |
2866 | ||
2867 | return count; | |
2868 | } | |
2869 | ||
2870 | static const struct file_operations smk_ptrace_ops = { | |
2871 | .write = smk_write_ptrace, | |
2872 | .read = smk_read_ptrace, | |
2873 | .llseek = default_llseek, | |
2874 | }; | |
2875 | ||
00f84f3f CS |
2876 | /** |
2877 | * smk_fill_super - fill the smackfs superblock | |
e114e473 | 2878 | * @sb: the empty superblock |
5afdd0f1 | 2879 | * @fc: unused |
e114e473 | 2880 | * |
00f84f3f | 2881 | * Fill in the well known entries for the smack filesystem |
e114e473 CS |
2882 | * |
2883 | * Returns 0 on success, an error code on failure | |
2884 | */ | |
5afdd0f1 | 2885 | static int smk_fill_super(struct super_block *sb, struct fs_context *fc) |
e114e473 CS |
2886 | { |
2887 | int rc; | |
e114e473 | 2888 | |
cda37124 | 2889 | static const struct tree_descr smack_files[] = { |
7898e1f8 CS |
2890 | [SMK_LOAD] = { |
2891 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2892 | [SMK_CIPSO] = { | |
2893 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2894 | [SMK_DOI] = { | |
2895 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2896 | [SMK_DIRECT] = { | |
2897 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2898 | [SMK_AMBIENT] = { | |
2899 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
21abb1ec CS |
2900 | [SMK_NET4ADDR] = { |
2901 | "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2902 | [SMK_ONLYCAP] = { |
2903 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2904 | [SMK_LOGGING] = { | |
2905 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2906 | [SMK_LOAD_SELF] = { | |
2907 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2908 | [SMK_ACCESSES] = { |
0e94ae17 | 2909 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2910 | [SMK_MAPPED] = { |
2911 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2912 | [SMK_LOAD2] = { | |
2913 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2914 | [SMK_LOAD_SELF2] = { | |
2915 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2916 | [SMK_ACCESS2] = { | |
2917 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2918 | [SMK_CIPSO2] = { | |
2919 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2920 | [SMK_REVOKE_SUBJ] = { |
2921 | "revoke-subject", &smk_revoke_subj_ops, | |
2922 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2923 | [SMK_CHANGE_RULE] = { |
2924 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
00f84f3f CS |
2925 | [SMK_SYSLOG] = { |
2926 | "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, | |
66867818 LP |
2927 | [SMK_PTRACE] = { |
2928 | "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, | |
bf4b2fee CS |
2929 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2930 | [SMK_UNCONFINED] = { | |
2931 | "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, | |
2932 | #endif | |
21abb1ec CS |
2933 | #if IS_ENABLED(CONFIG_IPV6) |
2934 | [SMK_NET6ADDR] = { | |
2935 | "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR}, | |
2936 | #endif /* CONFIG_IPV6 */ | |
38416e53 ZJ |
2937 | [SMK_RELABEL_SELF] = { |
2938 | "relabel-self", &smk_relabel_self_ops, | |
2939 | S_IRUGO|S_IWUGO}, | |
7898e1f8 CS |
2940 | /* last one */ |
2941 | {""} | |
e114e473 CS |
2942 | }; |
2943 | ||
2944 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2945 | if (rc != 0) { | |
2946 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2947 | __func__, rc); | |
2948 | return rc; | |
2949 | } | |
2950 | ||
e114e473 CS |
2951 | return 0; |
2952 | } | |
2953 | ||
2954 | /** | |
5afdd0f1 DH |
2955 | * smk_get_tree - get the smackfs superblock |
2956 | * @fc: The mount context, including any options | |
e114e473 CS |
2957 | * |
2958 | * Just passes everything along. | |
2959 | * | |
2960 | * Returns what the lower level code does. | |
2961 | */ | |
5afdd0f1 | 2962 | static int smk_get_tree(struct fs_context *fc) |
e114e473 | 2963 | { |
5afdd0f1 DH |
2964 | return get_tree_single(fc, smk_fill_super); |
2965 | } | |
2966 | ||
2967 | static const struct fs_context_operations smk_context_ops = { | |
2968 | .get_tree = smk_get_tree, | |
2969 | }; | |
2970 | ||
2971 | /** | |
2972 | * smk_init_fs_context - Initialise a filesystem context for smackfs | |
2973 | * @fc: The blank mount context | |
2974 | */ | |
2975 | static int smk_init_fs_context(struct fs_context *fc) | |
2976 | { | |
2977 | fc->ops = &smk_context_ops; | |
2978 | return 0; | |
e114e473 CS |
2979 | } |
2980 | ||
2981 | static struct file_system_type smk_fs_type = { | |
2982 | .name = "smackfs", | |
5afdd0f1 | 2983 | .init_fs_context = smk_init_fs_context, |
e114e473 CS |
2984 | .kill_sb = kill_litter_super, |
2985 | }; | |
2986 | ||
2987 | static struct vfsmount *smackfs_mount; | |
2988 | ||
2989 | /** | |
2990 | * init_smk_fs - get the smackfs superblock | |
2991 | * | |
2992 | * register the smackfs | |
2993 | * | |
076c54c5 AD |
2994 | * Do not register smackfs if Smack wasn't enabled |
2995 | * on boot. We can not put this method normally under the | |
2996 | * smack_init() code path since the security subsystem get | |
2997 | * initialized before the vfs caches. | |
2998 | * | |
2999 | * Returns true if we were not chosen on boot or if | |
3000 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
3001 | */ |
3002 | static int __init init_smk_fs(void) | |
3003 | { | |
3004 | int err; | |
f7112e6c | 3005 | int rc; |
e114e473 | 3006 | |
d21b7b04 | 3007 | if (smack_enabled == 0) |
076c54c5 AD |
3008 | return 0; |
3009 | ||
e9307237 CS |
3010 | err = smk_init_sysfs(); |
3011 | if (err) | |
3012 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
3013 | ||
e114e473 CS |
3014 | err = register_filesystem(&smk_fs_type); |
3015 | if (!err) { | |
3016 | smackfs_mount = kern_mount(&smk_fs_type); | |
3017 | if (IS_ERR(smackfs_mount)) { | |
3018 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
3019 | err = PTR_ERR(smackfs_mount); | |
3020 | smackfs_mount = NULL; | |
3021 | } | |
3022 | } | |
3023 | ||
e114e473 | 3024 | smk_cipso_doi(); |
4bc87e62 | 3025 | smk_unlbl_ambient(NULL); |
e114e473 | 3026 | |
322dd63c | 3027 | rc = smack_populate_secattr(&smack_known_floor); |
f7112e6c CS |
3028 | if (err == 0 && rc < 0) |
3029 | err = rc; | |
322dd63c | 3030 | rc = smack_populate_secattr(&smack_known_hat); |
f7112e6c CS |
3031 | if (err == 0 && rc < 0) |
3032 | err = rc; | |
322dd63c | 3033 | rc = smack_populate_secattr(&smack_known_huh); |
f7112e6c CS |
3034 | if (err == 0 && rc < 0) |
3035 | err = rc; | |
322dd63c | 3036 | rc = smack_populate_secattr(&smack_known_star); |
f7112e6c CS |
3037 | if (err == 0 && rc < 0) |
3038 | err = rc; | |
322dd63c | 3039 | rc = smack_populate_secattr(&smack_known_web); |
f7112e6c CS |
3040 | if (err == 0 && rc < 0) |
3041 | err = rc; | |
3042 | ||
e114e473 CS |
3043 | return err; |
3044 | } | |
3045 | ||
3046 | __initcall(init_smk_fs); |