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