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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 | ||
f91488ee | 696 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL); |
e114e473 CS |
697 | doip->map.std = NULL; |
698 | doip->doi = smk_cipso_doi_value; | |
699 | doip->type = CIPSO_V4_MAP_PASS; | |
700 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
701 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
702 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
703 | ||
6d3dc07c | 704 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 705 | if (rc != 0) { |
6c2e8ac0 PM |
706 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
707 | __func__, __LINE__, rc); | |
708 | kfree(doip); | |
709 | return; | |
710 | } | |
6d3dc07c | 711 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
712 | if (rc != 0) { |
713 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 714 | __func__, __LINE__, rc); |
0934ad42 | 715 | netlbl_cfg_cipsov4_del(doip->doi, &nai); |
6c2e8ac0 | 716 | return; |
b1edeb10 | 717 | } |
e114e473 CS |
718 | } |
719 | ||
4bc87e62 CS |
720 | /** |
721 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 722 | * @oldambient: previous domain string |
4bc87e62 | 723 | */ |
30aa4faf | 724 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
725 | { |
726 | int rc; | |
6d3dc07c | 727 | struct netlbl_audit nai; |
4bc87e62 | 728 | |
6d3dc07c | 729 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
730 | |
731 | if (oldambient != NULL) { | |
6d3dc07c | 732 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
733 | if (rc != 0) |
734 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
735 | __func__, __LINE__, rc); | |
736 | } | |
f7112e6c | 737 | if (smack_net_ambient == NULL) |
2f823ff8 | 738 | smack_net_ambient = &smack_known_floor; |
4bc87e62 | 739 | |
2f823ff8 | 740 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
6d3dc07c | 741 | NULL, NULL, &nai); |
4bc87e62 CS |
742 | if (rc != 0) |
743 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
744 | __func__, __LINE__, rc); | |
745 | } | |
746 | ||
e114e473 CS |
747 | /* |
748 | * Seq_file read operations for /smack/cipso | |
749 | */ | |
750 | ||
751 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
752 | { | |
40809565 | 753 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
754 | } |
755 | ||
756 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
757 | { | |
40809565 | 758 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
759 | } |
760 | ||
761 | /* | |
762 | * Print cipso labels in format: | |
763 | * label level[/cat[,cat]] | |
764 | */ | |
765 | static int cipso_seq_show(struct seq_file *s, void *v) | |
766 | { | |
7198e2ee EB |
767 | struct list_head *list = v; |
768 | struct smack_known *skp = | |
01fa8474 | 769 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 770 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 771 | char sep = '/'; |
e114e473 | 772 | int i; |
e114e473 | 773 | |
f7112e6c CS |
774 | /* |
775 | * Don't show a label that could not have been set using | |
776 | * /smack/cipso. This is in support of the notion that | |
777 | * anything read from /smack/cipso ought to be writeable | |
778 | * to /smack/cipso. | |
779 | * | |
780 | * /smack/cipso2 should be used instead. | |
781 | */ | |
782 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
783 | return 0; |
784 | ||
f7112e6c | 785 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 786 | |
4fbe63d1 PM |
787 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
788 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
789 | seq_printf(s, "%c%d", sep, i); |
790 | sep = ','; | |
791 | } | |
e114e473 CS |
792 | |
793 | seq_putc(s, '\n'); | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
88e9d34c | 798 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 799 | .start = cipso_seq_start, |
e114e473 CS |
800 | .next = cipso_seq_next, |
801 | .show = cipso_seq_show, | |
40809565 | 802 | .stop = smk_seq_stop, |
e114e473 CS |
803 | }; |
804 | ||
805 | /** | |
806 | * smk_open_cipso - open() for /smack/cipso | |
807 | * @inode: inode structure representing file | |
808 | * @file: "cipso" file pointer | |
809 | * | |
810 | * Connect our cipso_seq_* operations with /smack/cipso | |
811 | * file_operations | |
812 | */ | |
813 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
814 | { | |
815 | return seq_open(file, &cipso_seq_ops); | |
816 | } | |
817 | ||
818 | /** | |
f7112e6c | 819 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 820 | * @file: file pointer, not actually used |
e114e473 CS |
821 | * @buf: where to get the data from |
822 | * @count: bytes sent | |
823 | * @ppos: where to start | |
f7112e6c | 824 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
825 | * |
826 | * Accepts only one cipso rule per write call. | |
827 | * Returns number of bytes written or error code, as appropriate | |
828 | */ | |
f7112e6c CS |
829 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
830 | size_t count, loff_t *ppos, int format) | |
e114e473 | 831 | { |
0817534f | 832 | struct netlbl_lsm_catmap *old_cat; |
e114e473 | 833 | struct smack_known *skp; |
f7112e6c CS |
834 | struct netlbl_lsm_secattr ncats; |
835 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 836 | int maplevel; |
f7112e6c | 837 | unsigned int cat; |
e114e473 CS |
838 | int catlen; |
839 | ssize_t rc = -EINVAL; | |
840 | char *data = NULL; | |
841 | char *rule; | |
842 | int ret; | |
843 | int i; | |
844 | ||
845 | /* | |
846 | * Must have privilege. | |
847 | * No partial writes. | |
848 | * Enough data must be present. | |
849 | */ | |
1880eff7 | 850 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
851 | return -EPERM; |
852 | if (*ppos != 0) | |
853 | return -EINVAL; | |
f7112e6c CS |
854 | if (format == SMK_FIXED24_FMT && |
855 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 | 856 | return -EINVAL; |
49ec114a TH |
857 | if (count > PAGE_SIZE) |
858 | return -EINVAL; | |
e114e473 | 859 | |
16e5c1fc AV |
860 | data = memdup_user_nul(buf, count); |
861 | if (IS_ERR(data)) | |
862 | return PTR_ERR(data); | |
e114e473 | 863 | |
e114e473 CS |
864 | rule = data; |
865 | /* | |
866 | * Only allow one writer at a time. Writes should be | |
867 | * quite rare and small in any case. | |
868 | */ | |
869 | mutex_lock(&smack_cipso_lock); | |
870 | ||
871 | skp = smk_import_entry(rule, 0); | |
e774ad68 LP |
872 | if (IS_ERR(skp)) { |
873 | rc = PTR_ERR(skp); | |
e114e473 | 874 | goto out; |
e774ad68 | 875 | } |
e114e473 | 876 | |
f7112e6c CS |
877 | if (format == SMK_FIXED24_FMT) |
878 | rule += SMK_LABELLEN; | |
879 | else | |
0fcfee61 | 880 | rule += strlen(skp->smk_known) + 1; |
f7112e6c | 881 | |
84e99e58 CS |
882 | if (rule > data + count) { |
883 | rc = -EOVERFLOW; | |
884 | goto out; | |
885 | } | |
886 | ||
e114e473 | 887 | ret = sscanf(rule, "%d", &maplevel); |
42a2df3e | 888 | if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL) |
e114e473 CS |
889 | goto out; |
890 | ||
891 | rule += SMK_DIGITLEN; | |
84e99e58 CS |
892 | if (rule > data + count) { |
893 | rc = -EOVERFLOW; | |
894 | goto out; | |
895 | } | |
896 | ||
e114e473 CS |
897 | ret = sscanf(rule, "%d", &catlen); |
898 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
899 | goto out; | |
900 | ||
f7112e6c CS |
901 | if (format == SMK_FIXED24_FMT && |
902 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
903 | goto out; |
904 | ||
905 | memset(mapcatset, 0, sizeof(mapcatset)); | |
906 | ||
907 | for (i = 0; i < catlen; i++) { | |
908 | rule += SMK_DIGITLEN; | |
a6bd4f6d DC |
909 | if (rule > data + count) { |
910 | rc = -EOVERFLOW; | |
911 | goto out; | |
912 | } | |
f7112e6c | 913 | ret = sscanf(rule, "%u", &cat); |
677264e8 | 914 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
e114e473 CS |
915 | goto out; |
916 | ||
917 | smack_catset_bit(cat, mapcatset); | |
918 | } | |
919 | ||
f7112e6c CS |
920 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
921 | if (rc >= 0) { | |
0817534f | 922 | old_cat = skp->smk_netlabel.attr.mls.cat; |
f7112e6c CS |
923 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
924 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
0817534f PG |
925 | synchronize_rcu(); |
926 | netlbl_catmap_free(old_cat); | |
f7112e6c | 927 | rc = count; |
322dd63c CS |
928 | /* |
929 | * This mapping may have been cached, so clear the cache. | |
930 | */ | |
931 | netlbl_cache_invalidate(); | |
e114e473 CS |
932 | } |
933 | ||
e114e473 CS |
934 | out: |
935 | mutex_unlock(&smack_cipso_lock); | |
e114e473 CS |
936 | kfree(data); |
937 | return rc; | |
938 | } | |
939 | ||
f7112e6c CS |
940 | /** |
941 | * smk_write_cipso - write() for /smack/cipso | |
942 | * @file: file pointer, not actually used | |
943 | * @buf: where to get the data from | |
944 | * @count: bytes sent | |
945 | * @ppos: where to start | |
946 | * | |
947 | * Accepts only one cipso rule per write call. | |
948 | * Returns number of bytes written or error code, as appropriate | |
949 | */ | |
950 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
951 | size_t count, loff_t *ppos) | |
952 | { | |
953 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
954 | } | |
955 | ||
e114e473 CS |
956 | static const struct file_operations smk_cipso_ops = { |
957 | .open = smk_open_cipso, | |
958 | .read = seq_read, | |
959 | .llseek = seq_lseek, | |
960 | .write = smk_write_cipso, | |
961 | .release = seq_release, | |
962 | }; | |
963 | ||
f7112e6c CS |
964 | /* |
965 | * Seq_file read operations for /smack/cipso2 | |
966 | */ | |
967 | ||
968 | /* | |
969 | * Print cipso labels in format: | |
970 | * label level[/cat[,cat]] | |
971 | */ | |
972 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
973 | { | |
974 | struct list_head *list = v; | |
975 | struct smack_known *skp = | |
01fa8474 | 976 | list_entry_rcu(list, struct smack_known, list); |
4fbe63d1 | 977 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
f7112e6c CS |
978 | char sep = '/'; |
979 | int i; | |
980 | ||
981 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
982 | ||
4fbe63d1 PM |
983 | for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
984 | i = netlbl_catmap_walk(cmp, i + 1)) { | |
f7112e6c CS |
985 | seq_printf(s, "%c%d", sep, i); |
986 | sep = ','; | |
987 | } | |
988 | ||
989 | seq_putc(s, '\n'); | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | static const struct seq_operations cipso2_seq_ops = { | |
995 | .start = cipso_seq_start, | |
996 | .next = cipso_seq_next, | |
997 | .show = cipso2_seq_show, | |
998 | .stop = smk_seq_stop, | |
999 | }; | |
1000 | ||
1001 | /** | |
1002 | * smk_open_cipso2 - open() for /smack/cipso2 | |
1003 | * @inode: inode structure representing file | |
1004 | * @file: "cipso2" file pointer | |
1005 | * | |
1006 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
1007 | * file_operations | |
1008 | */ | |
1009 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
1010 | { | |
1011 | return seq_open(file, &cipso2_seq_ops); | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * smk_write_cipso2 - write() for /smack/cipso2 | |
1016 | * @file: file pointer, not actually used | |
1017 | * @buf: where to get the data from | |
1018 | * @count: bytes sent | |
1019 | * @ppos: where to start | |
1020 | * | |
1021 | * Accepts only one cipso rule per write call. | |
1022 | * Returns number of bytes written or error code, as appropriate | |
1023 | */ | |
1024 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
1025 | size_t count, loff_t *ppos) | |
1026 | { | |
1027 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
1028 | } | |
1029 | ||
1030 | static const struct file_operations smk_cipso2_ops = { | |
1031 | .open = smk_open_cipso2, | |
1032 | .read = seq_read, | |
1033 | .llseek = seq_lseek, | |
1034 | .write = smk_write_cipso2, | |
1035 | .release = seq_release, | |
1036 | }; | |
1037 | ||
6d3dc07c CS |
1038 | /* |
1039 | * Seq_file read operations for /smack/netlabel | |
1040 | */ | |
1041 | ||
21abb1ec | 1042 | static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
6d3dc07c | 1043 | { |
21abb1ec | 1044 | return smk_seq_start(s, pos, &smk_net4addr_list); |
6d3dc07c CS |
1045 | } |
1046 | ||
21abb1ec | 1047 | static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
6d3dc07c | 1048 | { |
21abb1ec | 1049 | return smk_seq_next(s, v, pos, &smk_net4addr_list); |
6d3dc07c | 1050 | } |
6d3dc07c CS |
1051 | |
1052 | /* | |
1053 | * Print host/label pairs | |
1054 | */ | |
21abb1ec | 1055 | static int net4addr_seq_show(struct seq_file *s, void *v) |
6d3dc07c | 1056 | { |
7198e2ee | 1057 | struct list_head *list = v; |
21abb1ec CS |
1058 | struct smk_net4addr *skp = |
1059 | list_entry_rcu(list, struct smk_net4addr, list); | |
1060 | char *kp = SMACK_CIPSO_OPTION; | |
6d3dc07c | 1061 | |
21abb1ec CS |
1062 | if (skp->smk_label != NULL) |
1063 | kp = skp->smk_label->smk_known; | |
1064 | seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr, | |
1065 | skp->smk_masks, kp); | |
6d3dc07c CS |
1066 | |
1067 | return 0; | |
1068 | } | |
1069 | ||
21abb1ec CS |
1070 | static const struct seq_operations net4addr_seq_ops = { |
1071 | .start = net4addr_seq_start, | |
1072 | .next = net4addr_seq_next, | |
1073 | .show = net4addr_seq_show, | |
40809565 | 1074 | .stop = smk_seq_stop, |
6d3dc07c CS |
1075 | }; |
1076 | ||
1077 | /** | |
21abb1ec | 1078 | * smk_open_net4addr - open() for /smack/netlabel |
6d3dc07c CS |
1079 | * @inode: inode structure representing file |
1080 | * @file: "netlabel" file pointer | |
1081 | * | |
21abb1ec | 1082 | * Connect our net4addr_seq_* operations with /smack/netlabel |
6d3dc07c CS |
1083 | * file_operations |
1084 | */ | |
21abb1ec | 1085 | static int smk_open_net4addr(struct inode *inode, struct file *file) |
6d3dc07c | 1086 | { |
21abb1ec | 1087 | return seq_open(file, &net4addr_seq_ops); |
6d3dc07c CS |
1088 | } |
1089 | ||
113a0e45 | 1090 | /** |
21abb1ec | 1091 | * smk_net4addr_insert |
113a0e45 | 1092 | * @new : netlabel to insert |
1093 | * | |
21abb1ec | 1094 | * This helper insert netlabel in the smack_net4addrs list |
113a0e45 | 1095 | * sorted by netmask length (longest to smallest) |
21abb1ec | 1096 | * locked by &smk_net4addr_lock in smk_write_net4addr |
7198e2ee | 1097 | * |
113a0e45 | 1098 | */ |
21abb1ec | 1099 | static void smk_net4addr_insert(struct smk_net4addr *new) |
113a0e45 | 1100 | { |
21abb1ec CS |
1101 | struct smk_net4addr *m; |
1102 | struct smk_net4addr *m_next; | |
113a0e45 | 1103 | |
21abb1ec CS |
1104 | if (list_empty(&smk_net4addr_list)) { |
1105 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1106 | return; |
1107 | } | |
1108 | ||
21abb1ec CS |
1109 | m = list_entry_rcu(smk_net4addr_list.next, |
1110 | struct smk_net4addr, list); | |
7198e2ee | 1111 | |
113a0e45 | 1112 | /* the comparison '>' is a bit hacky, but works */ |
21abb1ec CS |
1113 | if (new->smk_masks > m->smk_masks) { |
1114 | list_add_rcu(&new->list, &smk_net4addr_list); | |
113a0e45 | 1115 | return; |
1116 | } | |
7198e2ee | 1117 | |
21abb1ec CS |
1118 | list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
1119 | if (list_is_last(&m->list, &smk_net4addr_list)) { | |
7198e2ee | 1120 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1121 | return; |
1122 | } | |
05725f7e | 1123 | m_next = list_entry_rcu(m->list.next, |
21abb1ec CS |
1124 | struct smk_net4addr, list); |
1125 | if (new->smk_masks > m_next->smk_masks) { | |
7198e2ee | 1126 | list_add_rcu(&new->list, &m->list); |
113a0e45 | 1127 | return; |
1128 | } | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | ||
6d3dc07c | 1133 | /** |
21abb1ec | 1134 | * smk_write_net4addr - write() for /smack/netlabel |
251a2a95 | 1135 | * @file: file pointer, not actually used |
6d3dc07c CS |
1136 | * @buf: where to get the data from |
1137 | * @count: bytes sent | |
1138 | * @ppos: where to start | |
1139 | * | |
21abb1ec | 1140 | * Accepts only one net4addr per write call. |
6d3dc07c CS |
1141 | * Returns number of bytes written or error code, as appropriate |
1142 | */ | |
21abb1ec | 1143 | static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
6d3dc07c CS |
1144 | size_t count, loff_t *ppos) |
1145 | { | |
21abb1ec | 1146 | struct smk_net4addr *snp; |
6d3dc07c | 1147 | struct sockaddr_in newname; |
f7112e6c | 1148 | char *smack; |
21abb1ec | 1149 | struct smack_known *skp = NULL; |
f7112e6c | 1150 | char *data; |
6d3dc07c CS |
1151 | char *host = (char *)&newname.sin_addr.s_addr; |
1152 | int rc; | |
1153 | struct netlbl_audit audit_info; | |
1154 | struct in_addr mask; | |
1155 | unsigned int m; | |
21abb1ec | 1156 | unsigned int masks; |
7198e2ee | 1157 | int found; |
113a0e45 | 1158 | u32 mask_bits = (1<<31); |
6d3dc07c | 1159 | __be32 nsa; |
113a0e45 | 1160 | u32 temp_mask; |
6d3dc07c CS |
1161 | |
1162 | /* | |
1163 | * Must have privilege. | |
1164 | * No partial writes. | |
1165 | * Enough data must be present. | |
1166 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1167 | * "<addr, as a.b.c.d><space><label>" | |
1168 | */ | |
1880eff7 | 1169 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1170 | return -EPERM; |
1171 | if (*ppos != 0) | |
1172 | return -EINVAL; | |
7ef4c19d | 1173 | if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
6d3dc07c | 1174 | return -EINVAL; |
f7112e6c | 1175 | |
16e5c1fc AV |
1176 | data = memdup_user_nul(buf, count); |
1177 | if (IS_ERR(data)) | |
1178 | return PTR_ERR(data); | |
f7112e6c CS |
1179 | |
1180 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1181 | if (smack == NULL) { | |
1182 | rc = -ENOMEM; | |
1183 | goto free_data_out; | |
1184 | } | |
6d3dc07c | 1185 | |
ec554fa7 | 1186 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
21abb1ec | 1187 | &host[0], &host[1], &host[2], &host[3], &masks, smack); |
6d3dc07c CS |
1188 | if (rc != 6) { |
1189 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1190 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1191 | if (rc != 5) { |
1192 | rc = -EINVAL; | |
1193 | goto free_out; | |
1194 | } | |
6d3dc07c | 1195 | m = BEBITS; |
21abb1ec | 1196 | masks = 32; |
6d3dc07c | 1197 | } |
21abb1ec | 1198 | if (masks > BEBITS) { |
f7112e6c CS |
1199 | rc = -EINVAL; |
1200 | goto free_out; | |
1201 | } | |
6d3dc07c | 1202 | |
f7112e6c CS |
1203 | /* |
1204 | * If smack begins with '-', it is an option, don't import it | |
1205 | */ | |
4303154e | 1206 | if (smack[0] != '-') { |
21c7eae2 | 1207 | skp = smk_import_entry(smack, 0); |
e774ad68 LP |
1208 | if (IS_ERR(skp)) { |
1209 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1210 | goto free_out; |
1211 | } | |
4303154e | 1212 | } else { |
21abb1ec CS |
1213 | /* |
1214 | * Only the -CIPSO option is supported for IPv4 | |
1215 | */ | |
1216 | if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { | |
f7112e6c CS |
1217 | rc = -EINVAL; |
1218 | goto free_out; | |
1219 | } | |
4303154e | 1220 | } |
6d3dc07c | 1221 | |
21abb1ec | 1222 | for (m = masks, temp_mask = 0; m > 0; m--) { |
113a0e45 | 1223 | temp_mask |= mask_bits; |
1224 | mask_bits >>= 1; | |
6d3dc07c | 1225 | } |
113a0e45 | 1226 | mask.s_addr = cpu_to_be32(temp_mask); |
1227 | ||
1228 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1229 | /* |
1230 | * Only allow one writer at a time. Writes should be | |
1231 | * quite rare and small in any case. | |
1232 | */ | |
21abb1ec | 1233 | mutex_lock(&smk_net4addr_lock); |
6d3dc07c CS |
1234 | |
1235 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1236 | /* try to find if the prefix is already in the list */ |
7198e2ee | 1237 | found = 0; |
21abb1ec CS |
1238 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
1239 | if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { | |
7198e2ee | 1240 | found = 1; |
6d3dc07c | 1241 | break; |
7198e2ee EB |
1242 | } |
1243 | } | |
6d3dc07c CS |
1244 | smk_netlabel_audit_set(&audit_info); |
1245 | ||
7198e2ee | 1246 | if (found == 0) { |
21c7eae2 LP |
1247 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
1248 | if (snp == NULL) | |
6d3dc07c CS |
1249 | rc = -ENOMEM; |
1250 | else { | |
1251 | rc = 0; | |
21abb1ec | 1252 | snp->smk_host.s_addr = newname.sin_addr.s_addr; |
21c7eae2 LP |
1253 | snp->smk_mask.s_addr = mask.s_addr; |
1254 | snp->smk_label = skp; | |
21abb1ec CS |
1255 | snp->smk_masks = masks; |
1256 | smk_net4addr_insert(snp); | |
6d3dc07c CS |
1257 | } |
1258 | } else { | |
21abb1ec CS |
1259 | /* |
1260 | * Delete the unlabeled entry, only if the previous label | |
1261 | * wasn't the special CIPSO option | |
1262 | */ | |
1263 | if (snp->smk_label != NULL) | |
4303154e | 1264 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
21abb1ec | 1265 | &snp->smk_host, &snp->smk_mask, |
4303154e EB |
1266 | PF_INET, &audit_info); |
1267 | else | |
1268 | rc = 0; | |
21c7eae2 | 1269 | snp->smk_label = skp; |
6d3dc07c CS |
1270 | } |
1271 | ||
1272 | /* | |
1273 | * Now tell netlabel about the single label nature of | |
1274 | * this host so that incoming packets get labeled. | |
4303154e | 1275 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1276 | */ |
21abb1ec | 1277 | if (rc == 0 && skp != NULL) |
6d3dc07c | 1278 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
21abb1ec | 1279 | &snp->smk_host, &snp->smk_mask, PF_INET, |
21c7eae2 | 1280 | snp->smk_label->smk_secid, &audit_info); |
6d3dc07c CS |
1281 | |
1282 | if (rc == 0) | |
1283 | rc = count; | |
1284 | ||
21abb1ec CS |
1285 | mutex_unlock(&smk_net4addr_lock); |
1286 | ||
1287 | free_out: | |
1288 | kfree(smack); | |
1289 | free_data_out: | |
1290 | kfree(data); | |
1291 | ||
1292 | return rc; | |
1293 | } | |
1294 | ||
1295 | static const struct file_operations smk_net4addr_ops = { | |
1296 | .open = smk_open_net4addr, | |
1297 | .read = seq_read, | |
1298 | .llseek = seq_lseek, | |
1299 | .write = smk_write_net4addr, | |
1300 | .release = seq_release, | |
1301 | }; | |
1302 | ||
1303 | #if IS_ENABLED(CONFIG_IPV6) | |
1304 | /* | |
1305 | * Seq_file read operations for /smack/netlabel6 | |
1306 | */ | |
1307 | ||
1308 | static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) | |
1309 | { | |
1310 | return smk_seq_start(s, pos, &smk_net6addr_list); | |
1311 | } | |
1312 | ||
1313 | static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1314 | { | |
1315 | return smk_seq_next(s, v, pos, &smk_net6addr_list); | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Print host/label pairs | |
1320 | */ | |
1321 | static int net6addr_seq_show(struct seq_file *s, void *v) | |
1322 | { | |
1323 | struct list_head *list = v; | |
1324 | struct smk_net6addr *skp = | |
1325 | list_entry(list, struct smk_net6addr, list); | |
1326 | ||
1327 | if (skp->smk_label != NULL) | |
1328 | seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks, | |
1329 | skp->smk_label->smk_known); | |
1330 | ||
1331 | return 0; | |
1332 | } | |
1333 | ||
1334 | static const struct seq_operations net6addr_seq_ops = { | |
1335 | .start = net6addr_seq_start, | |
1336 | .next = net6addr_seq_next, | |
1337 | .show = net6addr_seq_show, | |
1338 | .stop = smk_seq_stop, | |
1339 | }; | |
1340 | ||
1341 | /** | |
1342 | * smk_open_net6addr - open() for /smack/netlabel | |
1343 | * @inode: inode structure representing file | |
1344 | * @file: "netlabel" file pointer | |
1345 | * | |
1346 | * Connect our net6addr_seq_* operations with /smack/netlabel | |
1347 | * file_operations | |
1348 | */ | |
1349 | static int smk_open_net6addr(struct inode *inode, struct file *file) | |
1350 | { | |
1351 | return seq_open(file, &net6addr_seq_ops); | |
1352 | } | |
1353 | ||
1354 | /** | |
1355 | * smk_net6addr_insert | |
1356 | * @new : entry to insert | |
1357 | * | |
1358 | * This inserts an entry in the smack_net6addrs list | |
1359 | * sorted by netmask length (longest to smallest) | |
1360 | * locked by &smk_net6addr_lock in smk_write_net6addr | |
1361 | * | |
1362 | */ | |
1363 | static void smk_net6addr_insert(struct smk_net6addr *new) | |
1364 | { | |
1365 | struct smk_net6addr *m_next; | |
1366 | struct smk_net6addr *m; | |
1367 | ||
1368 | if (list_empty(&smk_net6addr_list)) { | |
1369 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1370 | return; | |
1371 | } | |
1372 | ||
1373 | m = list_entry_rcu(smk_net6addr_list.next, | |
1374 | struct smk_net6addr, list); | |
1375 | ||
1376 | if (new->smk_masks > m->smk_masks) { | |
1377 | list_add_rcu(&new->list, &smk_net6addr_list); | |
1378 | return; | |
1379 | } | |
1380 | ||
1381 | list_for_each_entry_rcu(m, &smk_net6addr_list, list) { | |
1382 | if (list_is_last(&m->list, &smk_net6addr_list)) { | |
1383 | list_add_rcu(&new->list, &m->list); | |
1384 | return; | |
1385 | } | |
1386 | m_next = list_entry_rcu(m->list.next, | |
1387 | struct smk_net6addr, list); | |
1388 | if (new->smk_masks > m_next->smk_masks) { | |
1389 | list_add_rcu(&new->list, &m->list); | |
1390 | return; | |
1391 | } | |
1392 | } | |
1393 | } | |
1394 | ||
1395 | ||
1396 | /** | |
1397 | * smk_write_net6addr - write() for /smack/netlabel | |
1398 | * @file: file pointer, not actually used | |
1399 | * @buf: where to get the data from | |
1400 | * @count: bytes sent | |
1401 | * @ppos: where to start | |
1402 | * | |
1403 | * Accepts only one net6addr per write call. | |
1404 | * Returns number of bytes written or error code, as appropriate | |
1405 | */ | |
1406 | static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, | |
1407 | size_t count, loff_t *ppos) | |
1408 | { | |
1409 | struct smk_net6addr *snp; | |
1410 | struct in6_addr newname; | |
1411 | struct in6_addr fullmask; | |
1412 | struct smack_known *skp = NULL; | |
1413 | char *smack; | |
1414 | char *data; | |
1415 | int rc = 0; | |
1416 | int found = 0; | |
1417 | int i; | |
1418 | unsigned int scanned[8]; | |
1419 | unsigned int m; | |
1420 | unsigned int mask = 128; | |
1421 | ||
1422 | /* | |
1423 | * Must have privilege. | |
1424 | * No partial writes. | |
1425 | * Enough data must be present. | |
1426 | * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" | |
1427 | * "<addr, as a:b:c:d:e:f:g:h><space><label>" | |
1428 | */ | |
1429 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
1430 | return -EPERM; | |
1431 | if (*ppos != 0) | |
1432 | return -EINVAL; | |
7ef4c19d | 1433 | if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
21abb1ec CS |
1434 | return -EINVAL; |
1435 | ||
16e5c1fc AV |
1436 | data = memdup_user_nul(buf, count); |
1437 | if (IS_ERR(data)) | |
1438 | return PTR_ERR(data); | |
21abb1ec CS |
1439 | |
1440 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1441 | if (smack == NULL) { | |
1442 | rc = -ENOMEM; | |
1443 | goto free_data_out; | |
1444 | } | |
1445 | ||
21abb1ec CS |
1446 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s", |
1447 | &scanned[0], &scanned[1], &scanned[2], &scanned[3], | |
1448 | &scanned[4], &scanned[5], &scanned[6], &scanned[7], | |
1449 | &mask, smack); | |
1450 | if (i != 10) { | |
1451 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s", | |
1452 | &scanned[0], &scanned[1], &scanned[2], | |
1453 | &scanned[3], &scanned[4], &scanned[5], | |
1454 | &scanned[6], &scanned[7], smack); | |
1455 | if (i != 9) { | |
1456 | rc = -EINVAL; | |
1457 | goto free_out; | |
1458 | } | |
1459 | } | |
1460 | if (mask > 128) { | |
1461 | rc = -EINVAL; | |
1462 | goto free_out; | |
1463 | } | |
1464 | for (i = 0; i < 8; i++) { | |
1465 | if (scanned[i] > 0xffff) { | |
1466 | rc = -EINVAL; | |
1467 | goto free_out; | |
1468 | } | |
1469 | newname.s6_addr16[i] = htons(scanned[i]); | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * If smack begins with '-', it is an option, don't import it | |
1474 | */ | |
1475 | if (smack[0] != '-') { | |
1476 | skp = smk_import_entry(smack, 0); | |
5f2bfe2f LP |
1477 | if (IS_ERR(skp)) { |
1478 | rc = PTR_ERR(skp); | |
21abb1ec CS |
1479 | goto free_out; |
1480 | } | |
1481 | } else { | |
1482 | /* | |
1483 | * Only -DELETE is supported for IPv6 | |
1484 | */ | |
1485 | if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { | |
1486 | rc = -EINVAL; | |
1487 | goto free_out; | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | for (i = 0, m = mask; i < 8; i++) { | |
1492 | if (m >= 16) { | |
1493 | fullmask.s6_addr16[i] = 0xffff; | |
1494 | m -= 16; | |
1495 | } else if (m > 0) { | |
1496 | fullmask.s6_addr16[i] = (1 << m) - 1; | |
1497 | m = 0; | |
1498 | } else | |
1499 | fullmask.s6_addr16[i] = 0; | |
1500 | newname.s6_addr16[i] &= fullmask.s6_addr16[i]; | |
1501 | } | |
1502 | ||
1503 | /* | |
1504 | * Only allow one writer at a time. Writes should be | |
1505 | * quite rare and small in any case. | |
1506 | */ | |
1507 | mutex_lock(&smk_net6addr_lock); | |
1508 | /* | |
1509 | * Try to find the prefix in the list | |
1510 | */ | |
1511 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
1512 | if (mask != snp->smk_masks) | |
1513 | continue; | |
1514 | for (found = 1, i = 0; i < 8; i++) { | |
1515 | if (newname.s6_addr16[i] != | |
1516 | snp->smk_host.s6_addr16[i]) { | |
1517 | found = 0; | |
1518 | break; | |
1519 | } | |
1520 | } | |
1521 | if (found == 1) | |
1522 | break; | |
1523 | } | |
1524 | if (found == 0) { | |
1525 | snp = kzalloc(sizeof(*snp), GFP_KERNEL); | |
1526 | if (snp == NULL) | |
1527 | rc = -ENOMEM; | |
1528 | else { | |
1529 | snp->smk_host = newname; | |
1530 | snp->smk_mask = fullmask; | |
1531 | snp->smk_masks = mask; | |
1532 | snp->smk_label = skp; | |
1533 | smk_net6addr_insert(snp); | |
1534 | } | |
1535 | } else { | |
1536 | snp->smk_label = skp; | |
1537 | } | |
1538 | ||
1539 | if (rc == 0) | |
1540 | rc = count; | |
1541 | ||
1542 | mutex_unlock(&smk_net6addr_lock); | |
6d3dc07c | 1543 | |
f7112e6c CS |
1544 | free_out: |
1545 | kfree(smack); | |
1546 | free_data_out: | |
1547 | kfree(data); | |
1548 | ||
6d3dc07c CS |
1549 | return rc; |
1550 | } | |
1551 | ||
21abb1ec CS |
1552 | static const struct file_operations smk_net6addr_ops = { |
1553 | .open = smk_open_net6addr, | |
6d3dc07c CS |
1554 | .read = seq_read, |
1555 | .llseek = seq_lseek, | |
21abb1ec | 1556 | .write = smk_write_net6addr, |
6d3dc07c CS |
1557 | .release = seq_release, |
1558 | }; | |
21abb1ec | 1559 | #endif /* CONFIG_IPV6 */ |
6d3dc07c | 1560 | |
e114e473 CS |
1561 | /** |
1562 | * smk_read_doi - read() for /smack/doi | |
1563 | * @filp: file pointer, not actually used | |
1564 | * @buf: where to put the result | |
1565 | * @count: maximum to send along | |
1566 | * @ppos: where to start | |
1567 | * | |
1568 | * Returns number of bytes read or error code, as appropriate | |
1569 | */ | |
1570 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1571 | size_t count, loff_t *ppos) | |
1572 | { | |
1573 | char temp[80]; | |
1574 | ssize_t rc; | |
1575 | ||
1576 | if (*ppos != 0) | |
1577 | return 0; | |
1578 | ||
1579 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1580 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1581 | ||
1582 | return rc; | |
1583 | } | |
1584 | ||
1585 | /** | |
1586 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1587 | * @file: file pointer, not actually used |
e114e473 CS |
1588 | * @buf: where to get the data from |
1589 | * @count: bytes sent | |
1590 | * @ppos: where to start | |
1591 | * | |
1592 | * Returns number of bytes written or error code, as appropriate | |
1593 | */ | |
1594 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1595 | size_t count, loff_t *ppos) | |
1596 | { | |
1597 | char temp[80]; | |
1598 | int i; | |
1599 | ||
1880eff7 | 1600 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1601 | return -EPERM; |
1602 | ||
1603 | if (count >= sizeof(temp) || count == 0) | |
1604 | return -EINVAL; | |
1605 | ||
1606 | if (copy_from_user(temp, buf, count) != 0) | |
1607 | return -EFAULT; | |
1608 | ||
1609 | temp[count] = '\0'; | |
1610 | ||
1611 | if (sscanf(temp, "%d", &i) != 1) | |
1612 | return -EINVAL; | |
1613 | ||
1614 | smk_cipso_doi_value = i; | |
1615 | ||
1616 | smk_cipso_doi(); | |
1617 | ||
1618 | return count; | |
1619 | } | |
1620 | ||
1621 | static const struct file_operations smk_doi_ops = { | |
1622 | .read = smk_read_doi, | |
1623 | .write = smk_write_doi, | |
6038f373 | 1624 | .llseek = default_llseek, |
e114e473 CS |
1625 | }; |
1626 | ||
1627 | /** | |
1628 | * smk_read_direct - read() for /smack/direct | |
1629 | * @filp: file pointer, not actually used | |
1630 | * @buf: where to put the result | |
1631 | * @count: maximum to send along | |
1632 | * @ppos: where to start | |
1633 | * | |
1634 | * Returns number of bytes read or error code, as appropriate | |
1635 | */ | |
1636 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1637 | size_t count, loff_t *ppos) | |
1638 | { | |
1639 | char temp[80]; | |
1640 | ssize_t rc; | |
1641 | ||
1642 | if (*ppos != 0) | |
1643 | return 0; | |
1644 | ||
1645 | sprintf(temp, "%d", smack_cipso_direct); | |
1646 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1647 | ||
1648 | return rc; | |
1649 | } | |
1650 | ||
1651 | /** | |
1652 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1653 | * @file: file pointer, not actually used |
e114e473 CS |
1654 | * @buf: where to get the data from |
1655 | * @count: bytes sent | |
1656 | * @ppos: where to start | |
1657 | * | |
1658 | * Returns number of bytes written or error code, as appropriate | |
1659 | */ | |
1660 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1661 | size_t count, loff_t *ppos) | |
1662 | { | |
f7112e6c | 1663 | struct smack_known *skp; |
e114e473 CS |
1664 | char temp[80]; |
1665 | int i; | |
1666 | ||
1880eff7 | 1667 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1668 | return -EPERM; |
1669 | ||
1670 | if (count >= sizeof(temp) || count == 0) | |
1671 | return -EINVAL; | |
1672 | ||
1673 | if (copy_from_user(temp, buf, count) != 0) | |
1674 | return -EFAULT; | |
1675 | ||
1676 | temp[count] = '\0'; | |
1677 | ||
1678 | if (sscanf(temp, "%d", &i) != 1) | |
1679 | return -EINVAL; | |
1680 | ||
f7112e6c CS |
1681 | /* |
1682 | * Don't do anything if the value hasn't actually changed. | |
1683 | * If it is changing reset the level on entries that were | |
1684 | * set up to be direct when they were created. | |
1685 | */ | |
1686 | if (smack_cipso_direct != i) { | |
1687 | mutex_lock(&smack_known_lock); | |
1688 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1689 | if (skp->smk_netlabel.attr.mls.lvl == | |
1690 | smack_cipso_direct) | |
1691 | skp->smk_netlabel.attr.mls.lvl = i; | |
1692 | smack_cipso_direct = i; | |
1693 | mutex_unlock(&smack_known_lock); | |
1694 | } | |
e114e473 CS |
1695 | |
1696 | return count; | |
1697 | } | |
1698 | ||
1699 | static const struct file_operations smk_direct_ops = { | |
1700 | .read = smk_read_direct, | |
1701 | .write = smk_write_direct, | |
6038f373 | 1702 | .llseek = default_llseek, |
e114e473 CS |
1703 | }; |
1704 | ||
f7112e6c CS |
1705 | /** |
1706 | * smk_read_mapped - read() for /smack/mapped | |
1707 | * @filp: file pointer, not actually used | |
1708 | * @buf: where to put the result | |
1709 | * @count: maximum to send along | |
1710 | * @ppos: where to start | |
1711 | * | |
1712 | * Returns number of bytes read or error code, as appropriate | |
1713 | */ | |
1714 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1715 | size_t count, loff_t *ppos) | |
1716 | { | |
1717 | char temp[80]; | |
1718 | ssize_t rc; | |
1719 | ||
1720 | if (*ppos != 0) | |
1721 | return 0; | |
1722 | ||
1723 | sprintf(temp, "%d", smack_cipso_mapped); | |
1724 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1725 | ||
1726 | return rc; | |
1727 | } | |
1728 | ||
1729 | /** | |
1730 | * smk_write_mapped - write() for /smack/mapped | |
1731 | * @file: file pointer, not actually used | |
1732 | * @buf: where to get the data from | |
1733 | * @count: bytes sent | |
1734 | * @ppos: where to start | |
1735 | * | |
1736 | * Returns number of bytes written or error code, as appropriate | |
1737 | */ | |
1738 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1739 | size_t count, loff_t *ppos) | |
1740 | { | |
1741 | struct smack_known *skp; | |
1742 | char temp[80]; | |
1743 | int i; | |
1744 | ||
1880eff7 | 1745 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1746 | return -EPERM; |
1747 | ||
1748 | if (count >= sizeof(temp) || count == 0) | |
1749 | return -EINVAL; | |
1750 | ||
1751 | if (copy_from_user(temp, buf, count) != 0) | |
1752 | return -EFAULT; | |
1753 | ||
1754 | temp[count] = '\0'; | |
1755 | ||
1756 | if (sscanf(temp, "%d", &i) != 1) | |
1757 | return -EINVAL; | |
1758 | ||
1759 | /* | |
1760 | * Don't do anything if the value hasn't actually changed. | |
1761 | * If it is changing reset the level on entries that were | |
1762 | * set up to be mapped when they were created. | |
1763 | */ | |
1764 | if (smack_cipso_mapped != i) { | |
1765 | mutex_lock(&smack_known_lock); | |
1766 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1767 | if (skp->smk_netlabel.attr.mls.lvl == | |
1768 | smack_cipso_mapped) | |
1769 | skp->smk_netlabel.attr.mls.lvl = i; | |
1770 | smack_cipso_mapped = i; | |
1771 | mutex_unlock(&smack_known_lock); | |
1772 | } | |
1773 | ||
1774 | return count; | |
1775 | } | |
1776 | ||
1777 | static const struct file_operations smk_mapped_ops = { | |
1778 | .read = smk_read_mapped, | |
1779 | .write = smk_write_mapped, | |
1780 | .llseek = default_llseek, | |
1781 | }; | |
1782 | ||
e114e473 CS |
1783 | /** |
1784 | * smk_read_ambient - read() for /smack/ambient | |
1785 | * @filp: file pointer, not actually used | |
1786 | * @buf: where to put the result | |
1787 | * @cn: maximum to send along | |
1788 | * @ppos: where to start | |
1789 | * | |
1790 | * Returns number of bytes read or error code, as appropriate | |
1791 | */ | |
1792 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1793 | size_t cn, loff_t *ppos) | |
1794 | { | |
1795 | ssize_t rc; | |
e114e473 CS |
1796 | int asize; |
1797 | ||
1798 | if (*ppos != 0) | |
1799 | return 0; | |
1800 | /* | |
1801 | * Being careful to avoid a problem in the case where | |
1802 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1803 | */ |
4bc87e62 | 1804 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1805 | |
2f823ff8 | 1806 | asize = strlen(smack_net_ambient->smk_known) + 1; |
4bc87e62 CS |
1807 | |
1808 | if (cn >= asize) | |
1809 | rc = simple_read_from_buffer(buf, cn, ppos, | |
2f823ff8 CS |
1810 | smack_net_ambient->smk_known, |
1811 | asize); | |
4bc87e62 CS |
1812 | else |
1813 | rc = -EINVAL; | |
e114e473 | 1814 | |
4bc87e62 | 1815 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1816 | |
1817 | return rc; | |
1818 | } | |
1819 | ||
1820 | /** | |
1821 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1822 | * @file: file pointer, not actually used |
e114e473 CS |
1823 | * @buf: where to get the data from |
1824 | * @count: bytes sent | |
1825 | * @ppos: where to start | |
1826 | * | |
1827 | * Returns number of bytes written or error code, as appropriate | |
1828 | */ | |
1829 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1830 | size_t count, loff_t *ppos) | |
1831 | { | |
2f823ff8 | 1832 | struct smack_known *skp; |
4bc87e62 | 1833 | char *oldambient; |
f7112e6c CS |
1834 | char *data; |
1835 | int rc = count; | |
e114e473 | 1836 | |
1880eff7 | 1837 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1838 | return -EPERM; |
1839 | ||
7ef4c19d ST |
1840 | /* Enough data must be present */ |
1841 | if (count == 0 || count > PAGE_SIZE) | |
1842 | return -EINVAL; | |
1843 | ||
16e5c1fc AV |
1844 | data = memdup_user_nul(buf, count); |
1845 | if (IS_ERR(data)) | |
1846 | return PTR_ERR(data); | |
e114e473 | 1847 | |
2f823ff8 | 1848 | skp = smk_import_entry(data, count); |
e774ad68 LP |
1849 | if (IS_ERR(skp)) { |
1850 | rc = PTR_ERR(skp); | |
f7112e6c CS |
1851 | goto out; |
1852 | } | |
e114e473 | 1853 | |
4bc87e62 CS |
1854 | mutex_lock(&smack_ambient_lock); |
1855 | ||
2f823ff8 CS |
1856 | oldambient = smack_net_ambient->smk_known; |
1857 | smack_net_ambient = skp; | |
4bc87e62 CS |
1858 | smk_unlbl_ambient(oldambient); |
1859 | ||
1860 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1861 | |
f7112e6c CS |
1862 | out: |
1863 | kfree(data); | |
1864 | return rc; | |
e114e473 CS |
1865 | } |
1866 | ||
1867 | static const struct file_operations smk_ambient_ops = { | |
1868 | .read = smk_read_ambient, | |
1869 | .write = smk_write_ambient, | |
6038f373 | 1870 | .llseek = default_llseek, |
e114e473 CS |
1871 | }; |
1872 | ||
c0d77c88 RK |
1873 | /* |
1874 | * Seq_file operations for /smack/onlycap | |
15446235 | 1875 | */ |
c0d77c88 | 1876 | static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
15446235 | 1877 | { |
c0d77c88 RK |
1878 | return smk_seq_start(s, pos, &smack_onlycap_list); |
1879 | } | |
15446235 | 1880 | |
c0d77c88 RK |
1881 | static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1882 | { | |
1883 | return smk_seq_next(s, v, pos, &smack_onlycap_list); | |
1884 | } | |
15446235 | 1885 | |
c0d77c88 RK |
1886 | static int onlycap_seq_show(struct seq_file *s, void *v) |
1887 | { | |
1888 | struct list_head *list = v; | |
38416e53 ZJ |
1889 | struct smack_known_list_elem *sklep = |
1890 | list_entry_rcu(list, struct smack_known_list_elem, list); | |
15446235 | 1891 | |
38416e53 | 1892 | seq_puts(s, sklep->smk_label->smk_known); |
c0d77c88 | 1893 | seq_putc(s, ' '); |
15446235 | 1894 | |
c0d77c88 RK |
1895 | return 0; |
1896 | } | |
15446235 | 1897 | |
c0d77c88 RK |
1898 | static const struct seq_operations onlycap_seq_ops = { |
1899 | .start = onlycap_seq_start, | |
1900 | .next = onlycap_seq_next, | |
1901 | .show = onlycap_seq_show, | |
1902 | .stop = smk_seq_stop, | |
1903 | }; | |
1904 | ||
1905 | static int smk_open_onlycap(struct inode *inode, struct file *file) | |
1906 | { | |
1907 | return seq_open(file, &onlycap_seq_ops); | |
1908 | } | |
1909 | ||
1910 | /** | |
1911 | * smk_list_swap_rcu - swap public list with a private one in RCU-safe way | |
1912 | * The caller must hold appropriate mutex to prevent concurrent modifications | |
1913 | * to the public list. | |
1914 | * Private list is assumed to be not accessible to other threads yet. | |
1915 | * | |
1916 | * @public: public list | |
1917 | * @private: private list | |
1918 | */ | |
1919 | static void smk_list_swap_rcu(struct list_head *public, | |
1920 | struct list_head *private) | |
1921 | { | |
1922 | struct list_head *first, *last; | |
1923 | ||
1924 | if (list_empty(public)) { | |
1925 | list_splice_init_rcu(private, public, synchronize_rcu); | |
1926 | } else { | |
1927 | /* Remember public list before replacing it */ | |
1928 | first = public->next; | |
1929 | last = public->prev; | |
1930 | ||
1931 | /* Publish private list in place of public in RCU-safe way */ | |
1932 | private->prev->next = public; | |
1933 | private->next->prev = public; | |
1934 | rcu_assign_pointer(public->next, private->next); | |
1935 | public->prev = private->prev; | |
1936 | ||
1937 | synchronize_rcu(); | |
1938 | ||
1939 | /* When all readers are done with the old public list, | |
1940 | * attach it in place of private */ | |
1941 | private->next = first; | |
1942 | private->prev = last; | |
1943 | first->prev = private; | |
1944 | last->next = private; | |
1945 | } | |
15446235 CS |
1946 | } |
1947 | ||
38416e53 ZJ |
1948 | /** |
1949 | * smk_parse_label_list - parse list of Smack labels, separated by spaces | |
1950 | * | |
1951 | * @data: the string to parse | |
7da31b85 | 1952 | * @list: destination list |
38416e53 ZJ |
1953 | * |
1954 | * Returns zero on success or error code, as appropriate | |
1955 | */ | |
1956 | static int smk_parse_label_list(char *data, struct list_head *list) | |
1957 | { | |
1958 | char *tok; | |
1959 | struct smack_known *skp; | |
1960 | struct smack_known_list_elem *sklep; | |
1961 | ||
1962 | while ((tok = strsep(&data, " ")) != NULL) { | |
1963 | if (!*tok) | |
1964 | continue; | |
1965 | ||
1966 | skp = smk_import_entry(tok, 0); | |
1967 | if (IS_ERR(skp)) | |
1968 | return PTR_ERR(skp); | |
1969 | ||
1970 | sklep = kzalloc(sizeof(*sklep), GFP_KERNEL); | |
1971 | if (sklep == NULL) | |
1972 | return -ENOMEM; | |
1973 | ||
1974 | sklep->smk_label = skp; | |
1975 | list_add(&sklep->list, list); | |
1976 | } | |
1977 | ||
1978 | return 0; | |
1979 | } | |
1980 | ||
1981 | /** | |
1982 | * smk_destroy_label_list - destroy a list of smack_known_list_elem | |
7da31b85 | 1983 | * @list: header pointer of the list to destroy |
38416e53 ZJ |
1984 | */ |
1985 | void smk_destroy_label_list(struct list_head *list) | |
1986 | { | |
1987 | struct smack_known_list_elem *sklep; | |
1988 | struct smack_known_list_elem *sklep2; | |
1989 | ||
1990 | list_for_each_entry_safe(sklep, sklep2, list, list) | |
1991 | kfree(sklep); | |
1992 | ||
1993 | INIT_LIST_HEAD(list); | |
1994 | } | |
1995 | ||
15446235 | 1996 | /** |
00f84f3f | 1997 | * smk_write_onlycap - write() for smackfs/onlycap |
251a2a95 | 1998 | * @file: file pointer, not actually used |
15446235 CS |
1999 | * @buf: where to get the data from |
2000 | * @count: bytes sent | |
2001 | * @ppos: where to start | |
2002 | * | |
2003 | * Returns number of bytes written or error code, as appropriate | |
2004 | */ | |
2005 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
2006 | size_t count, loff_t *ppos) | |
2007 | { | |
f7112e6c | 2008 | char *data; |
c0d77c88 | 2009 | LIST_HEAD(list_tmp); |
38416e53 | 2010 | int rc; |
15446235 | 2011 | |
1880eff7 | 2012 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
2013 | return -EPERM; |
2014 | ||
7ef4c19d ST |
2015 | if (count > PAGE_SIZE) |
2016 | return -EINVAL; | |
2017 | ||
16e5c1fc AV |
2018 | data = memdup_user_nul(buf, count); |
2019 | if (IS_ERR(data)) | |
2020 | return PTR_ERR(data); | |
e774ad68 | 2021 | |
38416e53 | 2022 | rc = smk_parse_label_list(data, &list_tmp); |
c0d77c88 RK |
2023 | kfree(data); |
2024 | ||
15446235 | 2025 | /* |
e774ad68 LP |
2026 | * Clear the smack_onlycap on invalid label errors. This means |
2027 | * that we can pass a null string to unset the onlycap value. | |
f7112e6c | 2028 | * |
e774ad68 | 2029 | * Importing will also reject a label beginning with '-', |
f7112e6c | 2030 | * so "-usecapabilities" will also work. |
e774ad68 LP |
2031 | * |
2032 | * But do so only on invalid label, not on system errors. | |
c0d77c88 | 2033 | * The invalid label must be first to count as clearing attempt. |
15446235 | 2034 | */ |
38416e53 | 2035 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { |
c0d77c88 RK |
2036 | mutex_lock(&smack_onlycap_lock); |
2037 | smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); | |
2038 | mutex_unlock(&smack_onlycap_lock); | |
38416e53 | 2039 | rc = count; |
e774ad68 LP |
2040 | } |
2041 | ||
38416e53 | 2042 | smk_destroy_label_list(&list_tmp); |
15446235 | 2043 | |
f7112e6c | 2044 | return rc; |
15446235 CS |
2045 | } |
2046 | ||
2047 | static const struct file_operations smk_onlycap_ops = { | |
c0d77c88 RK |
2048 | .open = smk_open_onlycap, |
2049 | .read = seq_read, | |
15446235 | 2050 | .write = smk_write_onlycap, |
c0d77c88 RK |
2051 | .llseek = seq_lseek, |
2052 | .release = seq_release, | |
15446235 CS |
2053 | }; |
2054 | ||
bf4b2fee CS |
2055 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2056 | /** | |
2057 | * smk_read_unconfined - read() for smackfs/unconfined | |
2058 | * @filp: file pointer, not actually used | |
2059 | * @buf: where to put the result | |
2060 | * @cn: maximum to send along | |
2061 | * @ppos: where to start | |
2062 | * | |
2063 | * Returns number of bytes read or error code, as appropriate | |
2064 | */ | |
2065 | static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, | |
2066 | size_t cn, loff_t *ppos) | |
2067 | { | |
2068 | char *smack = ""; | |
2069 | ssize_t rc = -EINVAL; | |
2070 | int asize; | |
2071 | ||
2072 | if (*ppos != 0) | |
2073 | return 0; | |
2074 | ||
2075 | if (smack_unconfined != NULL) | |
2076 | smack = smack_unconfined->smk_known; | |
2077 | ||
2078 | asize = strlen(smack) + 1; | |
2079 | ||
2080 | if (cn >= asize) | |
2081 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
2082 | ||
2083 | return rc; | |
2084 | } | |
2085 | ||
2086 | /** | |
2087 | * smk_write_unconfined - write() for smackfs/unconfined | |
2088 | * @file: file pointer, not actually used | |
2089 | * @buf: where to get the data from | |
2090 | * @count: bytes sent | |
2091 | * @ppos: where to start | |
2092 | * | |
2093 | * Returns number of bytes written or error code, as appropriate | |
2094 | */ | |
2095 | static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, | |
2096 | size_t count, loff_t *ppos) | |
2097 | { | |
2098 | char *data; | |
e774ad68 | 2099 | struct smack_known *skp; |
bf4b2fee CS |
2100 | int rc = count; |
2101 | ||
2102 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2103 | return -EPERM; | |
2104 | ||
7ef4c19d ST |
2105 | if (count > PAGE_SIZE) |
2106 | return -EINVAL; | |
2107 | ||
16e5c1fc AV |
2108 | data = memdup_user_nul(buf, count); |
2109 | if (IS_ERR(data)) | |
2110 | return PTR_ERR(data); | |
e774ad68 | 2111 | |
bf4b2fee | 2112 | /* |
e774ad68 LP |
2113 | * Clear the smack_unconfined on invalid label errors. This means |
2114 | * that we can pass a null string to unset the unconfined value. | |
bf4b2fee | 2115 | * |
e774ad68 | 2116 | * Importing will also reject a label beginning with '-', |
bf4b2fee | 2117 | * so "-confine" will also work. |
e774ad68 LP |
2118 | * |
2119 | * But do so only on invalid label, not on system errors. | |
bf4b2fee | 2120 | */ |
e774ad68 LP |
2121 | skp = smk_import_entry(data, count); |
2122 | if (PTR_ERR(skp) == -EINVAL) | |
2123 | skp = NULL; | |
2124 | else if (IS_ERR(skp)) { | |
2125 | rc = PTR_ERR(skp); | |
2126 | goto freeout; | |
2127 | } | |
2128 | ||
2129 | smack_unconfined = skp; | |
bf4b2fee | 2130 | |
e774ad68 | 2131 | freeout: |
bf4b2fee CS |
2132 | kfree(data); |
2133 | return rc; | |
2134 | } | |
2135 | ||
2136 | static const struct file_operations smk_unconfined_ops = { | |
2137 | .read = smk_read_unconfined, | |
2138 | .write = smk_write_unconfined, | |
2139 | .llseek = default_llseek, | |
2140 | }; | |
2141 | #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ | |
2142 | ||
ecfcc53f EB |
2143 | /** |
2144 | * smk_read_logging - read() for /smack/logging | |
2145 | * @filp: file pointer, not actually used | |
2146 | * @buf: where to put the result | |
7da31b85 | 2147 | * @count: maximum to send along |
ecfcc53f EB |
2148 | * @ppos: where to start |
2149 | * | |
2150 | * Returns number of bytes read or error code, as appropriate | |
2151 | */ | |
2152 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
2153 | size_t count, loff_t *ppos) | |
2154 | { | |
2155 | char temp[32]; | |
2156 | ssize_t rc; | |
2157 | ||
2158 | if (*ppos != 0) | |
2159 | return 0; | |
2160 | ||
2161 | sprintf(temp, "%d\n", log_policy); | |
2162 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2163 | return rc; | |
2164 | } | |
2165 | ||
2166 | /** | |
2167 | * smk_write_logging - write() for /smack/logging | |
2168 | * @file: file pointer, not actually used | |
2169 | * @buf: where to get the data from | |
2170 | * @count: bytes sent | |
2171 | * @ppos: where to start | |
2172 | * | |
2173 | * Returns number of bytes written or error code, as appropriate | |
2174 | */ | |
2175 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
2176 | size_t count, loff_t *ppos) | |
2177 | { | |
2178 | char temp[32]; | |
2179 | int i; | |
2180 | ||
1880eff7 | 2181 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
2182 | return -EPERM; |
2183 | ||
2184 | if (count >= sizeof(temp) || count == 0) | |
2185 | return -EINVAL; | |
2186 | ||
2187 | if (copy_from_user(temp, buf, count) != 0) | |
2188 | return -EFAULT; | |
2189 | ||
2190 | temp[count] = '\0'; | |
2191 | ||
2192 | if (sscanf(temp, "%d", &i) != 1) | |
2193 | return -EINVAL; | |
2194 | if (i < 0 || i > 3) | |
2195 | return -EINVAL; | |
2196 | log_policy = i; | |
2197 | return count; | |
2198 | } | |
2199 | ||
2200 | ||
2201 | ||
2202 | static const struct file_operations smk_logging_ops = { | |
2203 | .read = smk_read_logging, | |
2204 | .write = smk_write_logging, | |
6038f373 | 2205 | .llseek = default_llseek, |
ecfcc53f | 2206 | }; |
7898e1f8 CS |
2207 | |
2208 | /* | |
2209 | * Seq_file read operations for /smack/load-self | |
2210 | */ | |
2211 | ||
2212 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
2213 | { | |
b17103a8 | 2214 | struct task_smack *tsp = smack_cred(current_cred()); |
7898e1f8 | 2215 | |
40809565 | 2216 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
2217 | } |
2218 | ||
2219 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2220 | { | |
b17103a8 | 2221 | struct task_smack *tsp = smack_cred(current_cred()); |
7898e1f8 | 2222 | |
40809565 | 2223 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
2224 | } |
2225 | ||
2226 | static int load_self_seq_show(struct seq_file *s, void *v) | |
2227 | { | |
2228 | struct list_head *list = v; | |
2229 | struct smack_rule *srp = | |
01fa8474 | 2230 | list_entry_rcu(list, struct smack_rule, list); |
7898e1f8 | 2231 | |
f7112e6c | 2232 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
2233 | |
2234 | return 0; | |
2235 | } | |
2236 | ||
7898e1f8 CS |
2237 | static const struct seq_operations load_self_seq_ops = { |
2238 | .start = load_self_seq_start, | |
2239 | .next = load_self_seq_next, | |
2240 | .show = load_self_seq_show, | |
40809565 | 2241 | .stop = smk_seq_stop, |
7898e1f8 CS |
2242 | }; |
2243 | ||
2244 | ||
2245 | /** | |
f7112e6c | 2246 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
2247 | * @inode: inode structure representing file |
2248 | * @file: "load" file pointer | |
2249 | * | |
2250 | * For reading, use load_seq_* seq_file reading operations. | |
2251 | */ | |
2252 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
2253 | { | |
2254 | return seq_open(file, &load_self_seq_ops); | |
2255 | } | |
2256 | ||
2257 | /** | |
2258 | * smk_write_load_self - write() for /smack/load-self | |
2259 | * @file: file pointer, not actually used | |
2260 | * @buf: where to get the data from | |
2261 | * @count: bytes sent | |
2262 | * @ppos: where to start - must be 0 | |
2263 | * | |
2264 | */ | |
2265 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
2266 | size_t count, loff_t *ppos) | |
2267 | { | |
b17103a8 | 2268 | struct task_smack *tsp = smack_cred(current_cred()); |
7898e1f8 | 2269 | |
f7112e6c CS |
2270 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
2271 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
2272 | } |
2273 | ||
2274 | static const struct file_operations smk_load_self_ops = { | |
2275 | .open = smk_open_load_self, | |
2276 | .read = seq_read, | |
2277 | .llseek = seq_lseek, | |
2278 | .write = smk_write_load_self, | |
2279 | .release = seq_release, | |
2280 | }; | |
828716c2 JS |
2281 | |
2282 | /** | |
f7112e6c | 2283 | * smk_user_access - handle access check transaction |
828716c2 JS |
2284 | * @file: file pointer |
2285 | * @buf: data from user space | |
2286 | * @count: bytes sent | |
2287 | * @ppos: where to start - must be 0 | |
7da31b85 | 2288 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
828716c2 | 2289 | */ |
f7112e6c CS |
2290 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
2291 | size_t count, loff_t *ppos, int format) | |
828716c2 | 2292 | { |
e05b6f98 | 2293 | struct smack_parsed_rule rule; |
828716c2 | 2294 | char *data; |
f8859d98 | 2295 | int res; |
828716c2 | 2296 | |
828716c2 JS |
2297 | data = simple_transaction_get(file, buf, count); |
2298 | if (IS_ERR(data)) | |
2299 | return PTR_ERR(data); | |
2300 | ||
f7112e6c CS |
2301 | if (format == SMK_FIXED24_FMT) { |
2302 | if (count < SMK_LOADLEN) | |
2303 | return -EINVAL; | |
2304 | res = smk_parse_rule(data, &rule, 0); | |
2305 | } else { | |
2306 | /* | |
10289b0f | 2307 | * simple_transaction_get() returns null-terminated data |
f7112e6c | 2308 | */ |
10289b0f | 2309 | res = smk_parse_long_rule(data, &rule, 0, 3); |
f7112e6c CS |
2310 | } |
2311 | ||
398ce073 JS |
2312 | if (res >= 0) |
2313 | res = smk_access(rule.smk_subject, rule.smk_object, | |
2314 | rule.smk_access1, NULL); | |
2315 | else if (res != -ENOENT) | |
e774ad68 | 2316 | return res; |
828716c2 | 2317 | |
d166c802 CS |
2318 | /* |
2319 | * smk_access() can return a value > 0 in the "bringup" case. | |
2320 | */ | |
2321 | data[0] = res >= 0 ? '1' : '0'; | |
f8859d98 | 2322 | data[1] = '\0'; |
828716c2 | 2323 | |
d86b2b61 | 2324 | simple_transaction_set(file, 2); |
f7112e6c CS |
2325 | |
2326 | if (format == SMK_FIXED24_FMT) | |
2327 | return SMK_LOADLEN; | |
2328 | return count; | |
2329 | } | |
2330 | ||
2331 | /** | |
2332 | * smk_write_access - handle access check transaction | |
2333 | * @file: file pointer | |
2334 | * @buf: data from user space | |
2335 | * @count: bytes sent | |
2336 | * @ppos: where to start - must be 0 | |
2337 | */ | |
2338 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
2339 | size_t count, loff_t *ppos) | |
2340 | { | |
2341 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
2342 | } |
2343 | ||
2344 | static const struct file_operations smk_access_ops = { | |
2345 | .write = smk_write_access, | |
2346 | .read = simple_transaction_read, | |
2347 | .release = simple_transaction_release, | |
2348 | .llseek = generic_file_llseek, | |
2349 | }; | |
2350 | ||
f7112e6c CS |
2351 | |
2352 | /* | |
2353 | * Seq_file read operations for /smack/load2 | |
2354 | */ | |
2355 | ||
2356 | static int load2_seq_show(struct seq_file *s, void *v) | |
2357 | { | |
2358 | struct list_head *list = v; | |
460d95a1 VG |
2359 | struct smack_rule *srp; |
2360 | struct smack_known *skp = | |
2361 | list_entry_rcu(list, struct smack_known, list); | |
f7112e6c | 2362 | |
460d95a1 VG |
2363 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) |
2364 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
f7112e6c CS |
2365 | |
2366 | return 0; | |
2367 | } | |
2368 | ||
2369 | static const struct seq_operations load2_seq_ops = { | |
2370 | .start = load2_seq_start, | |
2371 | .next = load2_seq_next, | |
2372 | .show = load2_seq_show, | |
2373 | .stop = smk_seq_stop, | |
2374 | }; | |
2375 | ||
2376 | /** | |
2377 | * smk_open_load2 - open() for /smack/load2 | |
2378 | * @inode: inode structure representing file | |
2379 | * @file: "load2" file pointer | |
2380 | * | |
2381 | * For reading, use load2_seq_* seq_file reading operations. | |
2382 | */ | |
2383 | static int smk_open_load2(struct inode *inode, struct file *file) | |
2384 | { | |
2385 | return seq_open(file, &load2_seq_ops); | |
2386 | } | |
2387 | ||
2388 | /** | |
2389 | * smk_write_load2 - write() for /smack/load2 | |
2390 | * @file: file pointer, not actually used | |
2391 | * @buf: where to get the data from | |
2392 | * @count: bytes sent | |
2393 | * @ppos: where to start - must be 0 | |
2394 | * | |
2395 | */ | |
2396 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
2397 | size_t count, loff_t *ppos) | |
2398 | { | |
2399 | /* | |
2400 | * Must have privilege. | |
2401 | */ | |
1880eff7 | 2402 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
2403 | return -EPERM; |
2404 | ||
2405 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2406 | SMK_LONG_FMT); | |
2407 | } | |
2408 | ||
2409 | static const struct file_operations smk_load2_ops = { | |
2410 | .open = smk_open_load2, | |
2411 | .read = seq_read, | |
2412 | .llseek = seq_lseek, | |
2413 | .write = smk_write_load2, | |
2414 | .release = seq_release, | |
2415 | }; | |
2416 | ||
2417 | /* | |
2418 | * Seq_file read operations for /smack/load-self2 | |
2419 | */ | |
2420 | ||
2421 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
2422 | { | |
b17103a8 | 2423 | struct task_smack *tsp = smack_cred(current_cred()); |
f7112e6c CS |
2424 | |
2425 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
2426 | } | |
2427 | ||
2428 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2429 | { | |
b17103a8 | 2430 | struct task_smack *tsp = smack_cred(current_cred()); |
f7112e6c CS |
2431 | |
2432 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
2433 | } | |
2434 | ||
2435 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
2436 | { | |
2437 | struct list_head *list = v; | |
2438 | struct smack_rule *srp = | |
01fa8474 | 2439 | list_entry_rcu(list, struct smack_rule, list); |
f7112e6c CS |
2440 | |
2441 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
2442 | ||
2443 | return 0; | |
2444 | } | |
2445 | ||
2446 | static const struct seq_operations load_self2_seq_ops = { | |
2447 | .start = load_self2_seq_start, | |
2448 | .next = load_self2_seq_next, | |
2449 | .show = load_self2_seq_show, | |
2450 | .stop = smk_seq_stop, | |
2451 | }; | |
2452 | ||
2453 | /** | |
2454 | * smk_open_load_self2 - open() for /smack/load-self2 | |
2455 | * @inode: inode structure representing file | |
2456 | * @file: "load" file pointer | |
2457 | * | |
2458 | * For reading, use load_seq_* seq_file reading operations. | |
2459 | */ | |
2460 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
2461 | { | |
2462 | return seq_open(file, &load_self2_seq_ops); | |
2463 | } | |
2464 | ||
2465 | /** | |
2466 | * smk_write_load_self2 - write() for /smack/load-self2 | |
2467 | * @file: file pointer, not actually used | |
2468 | * @buf: where to get the data from | |
2469 | * @count: bytes sent | |
2470 | * @ppos: where to start - must be 0 | |
2471 | * | |
2472 | */ | |
2473 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
2474 | size_t count, loff_t *ppos) | |
2475 | { | |
b17103a8 | 2476 | struct task_smack *tsp = smack_cred(current_cred()); |
f7112e6c CS |
2477 | |
2478 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
2479 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
2480 | } | |
2481 | ||
2482 | static const struct file_operations smk_load_self2_ops = { | |
2483 | .open = smk_open_load_self2, | |
2484 | .read = seq_read, | |
2485 | .llseek = seq_lseek, | |
2486 | .write = smk_write_load_self2, | |
2487 | .release = seq_release, | |
2488 | }; | |
2489 | ||
2490 | /** | |
2491 | * smk_write_access2 - handle access check transaction | |
2492 | * @file: file pointer | |
2493 | * @buf: data from user space | |
2494 | * @count: bytes sent | |
2495 | * @ppos: where to start - must be 0 | |
2496 | */ | |
2497 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
2498 | size_t count, loff_t *ppos) | |
2499 | { | |
2500 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
2501 | } | |
2502 | ||
2503 | static const struct file_operations smk_access2_ops = { | |
2504 | .write = smk_write_access2, | |
2505 | .read = simple_transaction_read, | |
2506 | .release = simple_transaction_release, | |
2507 | .llseek = generic_file_llseek, | |
2508 | }; | |
2509 | ||
449543b0 RK |
2510 | /** |
2511 | * smk_write_revoke_subj - write() for /smack/revoke-subject | |
2512 | * @file: file pointer | |
2513 | * @buf: data from user space | |
2514 | * @count: bytes sent | |
2515 | * @ppos: where to start - must be 0 | |
2516 | */ | |
2517 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, | |
2518 | size_t count, loff_t *ppos) | |
2519 | { | |
54302094 DC |
2520 | char *data; |
2521 | const char *cp; | |
449543b0 RK |
2522 | struct smack_known *skp; |
2523 | struct smack_rule *sp; | |
2524 | struct list_head *rule_list; | |
2525 | struct mutex *rule_lock; | |
2526 | int rc = count; | |
2527 | ||
2528 | if (*ppos != 0) | |
2529 | return -EINVAL; | |
2530 | ||
2531 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2532 | return -EPERM; | |
2533 | ||
2534 | if (count == 0 || count > SMK_LONGLABEL) | |
2535 | return -EINVAL; | |
2536 | ||
63e24c49 ME |
2537 | data = memdup_user(buf, count); |
2538 | if (IS_ERR(data)) | |
2539 | return PTR_ERR(data); | |
449543b0 RK |
2540 | |
2541 | cp = smk_parse_smack(data, count); | |
e774ad68 LP |
2542 | if (IS_ERR(cp)) { |
2543 | rc = PTR_ERR(cp); | |
54302094 | 2544 | goto out_data; |
449543b0 RK |
2545 | } |
2546 | ||
2547 | skp = smk_find_entry(cp); | |
d15d9fad | 2548 | if (skp == NULL) |
54302094 | 2549 | goto out_cp; |
449543b0 RK |
2550 | |
2551 | rule_list = &skp->smk_rules; | |
2552 | rule_lock = &skp->smk_rules_lock; | |
2553 | ||
2554 | mutex_lock(rule_lock); | |
2555 | ||
2556 | list_for_each_entry_rcu(sp, rule_list, list) | |
2557 | sp->smk_access = 0; | |
2558 | ||
2559 | mutex_unlock(rule_lock); | |
2560 | ||
54302094 | 2561 | out_cp: |
449543b0 | 2562 | kfree(cp); |
54302094 DC |
2563 | out_data: |
2564 | kfree(data); | |
2565 | ||
449543b0 RK |
2566 | return rc; |
2567 | } | |
2568 | ||
2569 | static const struct file_operations smk_revoke_subj_ops = { | |
2570 | .write = smk_write_revoke_subj, | |
2571 | .read = simple_transaction_read, | |
2572 | .release = simple_transaction_release, | |
2573 | .llseek = generic_file_llseek, | |
2574 | }; | |
2575 | ||
e9307237 CS |
2576 | /** |
2577 | * smk_init_sysfs - initialize /sys/fs/smackfs | |
2578 | * | |
2579 | */ | |
2580 | static int smk_init_sysfs(void) | |
2581 | { | |
ca70d27e | 2582 | return sysfs_create_mount_point(fs_kobj, "smackfs"); |
e9307237 CS |
2583 | } |
2584 | ||
e05b6f98 RK |
2585 | /** |
2586 | * smk_write_change_rule - write() for /smack/change-rule | |
2587 | * @file: file pointer | |
2588 | * @buf: data from user space | |
2589 | * @count: bytes sent | |
2590 | * @ppos: where to start - must be 0 | |
2591 | */ | |
2592 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, | |
2593 | size_t count, loff_t *ppos) | |
2594 | { | |
2595 | /* | |
2596 | * Must have privilege. | |
2597 | */ | |
4afde48b | 2598 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e05b6f98 RK |
2599 | return -EPERM; |
2600 | ||
2601 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
2602 | SMK_CHANGE_FMT); | |
2603 | } | |
2604 | ||
2605 | static const struct file_operations smk_change_rule_ops = { | |
2606 | .write = smk_write_change_rule, | |
2607 | .read = simple_transaction_read, | |
2608 | .release = simple_transaction_release, | |
2609 | .llseek = generic_file_llseek, | |
2610 | }; | |
2611 | ||
e114e473 | 2612 | /** |
00f84f3f CS |
2613 | * smk_read_syslog - read() for smackfs/syslog |
2614 | * @filp: file pointer, not actually used | |
2615 | * @buf: where to put the result | |
2616 | * @cn: maximum to send along | |
2617 | * @ppos: where to start | |
2618 | * | |
2619 | * Returns number of bytes read or error code, as appropriate | |
2620 | */ | |
2621 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, | |
2622 | size_t cn, loff_t *ppos) | |
2623 | { | |
2624 | struct smack_known *skp; | |
2625 | ssize_t rc = -EINVAL; | |
2626 | int asize; | |
2627 | ||
2628 | if (*ppos != 0) | |
2629 | return 0; | |
2630 | ||
2631 | if (smack_syslog_label == NULL) | |
2632 | skp = &smack_known_star; | |
2633 | else | |
2634 | skp = smack_syslog_label; | |
2635 | ||
2636 | asize = strlen(skp->smk_known) + 1; | |
2637 | ||
2638 | if (cn >= asize) | |
2639 | rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, | |
2640 | asize); | |
2641 | ||
2642 | return rc; | |
2643 | } | |
2644 | ||
2645 | /** | |
2646 | * smk_write_syslog - write() for smackfs/syslog | |
2647 | * @file: file pointer, not actually used | |
2648 | * @buf: where to get the data from | |
2649 | * @count: bytes sent | |
2650 | * @ppos: where to start | |
2651 | * | |
2652 | * Returns number of bytes written or error code, as appropriate | |
2653 | */ | |
2654 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, | |
2655 | size_t count, loff_t *ppos) | |
2656 | { | |
2657 | char *data; | |
2658 | struct smack_known *skp; | |
2659 | int rc = count; | |
2660 | ||
2661 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2662 | return -EPERM; | |
2663 | ||
7ef4c19d ST |
2664 | /* Enough data must be present */ |
2665 | if (count == 0 || count > PAGE_SIZE) | |
2666 | return -EINVAL; | |
2667 | ||
16e5c1fc AV |
2668 | data = memdup_user_nul(buf, count); |
2669 | if (IS_ERR(data)) | |
2670 | return PTR_ERR(data); | |
00f84f3f | 2671 | |
16e5c1fc AV |
2672 | skp = smk_import_entry(data, count); |
2673 | if (IS_ERR(skp)) | |
2674 | rc = PTR_ERR(skp); | |
2675 | else | |
2676 | smack_syslog_label = skp; | |
00f84f3f CS |
2677 | |
2678 | kfree(data); | |
2679 | return rc; | |
2680 | } | |
2681 | ||
2682 | static const struct file_operations smk_syslog_ops = { | |
2683 | .read = smk_read_syslog, | |
2684 | .write = smk_write_syslog, | |
2685 | .llseek = default_llseek, | |
2686 | }; | |
2687 | ||
38416e53 ZJ |
2688 | /* |
2689 | * Seq_file read operations for /smack/relabel-self | |
2690 | */ | |
2691 | ||
2692 | static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos) | |
2693 | { | |
b17103a8 | 2694 | struct task_smack *tsp = smack_cred(current_cred()); |
38416e53 ZJ |
2695 | |
2696 | return smk_seq_start(s, pos, &tsp->smk_relabel); | |
2697 | } | |
2698 | ||
2699 | static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2700 | { | |
b17103a8 | 2701 | struct task_smack *tsp = smack_cred(current_cred()); |
38416e53 ZJ |
2702 | |
2703 | return smk_seq_next(s, v, pos, &tsp->smk_relabel); | |
2704 | } | |
2705 | ||
2706 | static int relabel_self_seq_show(struct seq_file *s, void *v) | |
2707 | { | |
2708 | struct list_head *list = v; | |
2709 | struct smack_known_list_elem *sklep = | |
2710 | list_entry(list, struct smack_known_list_elem, list); | |
2711 | ||
2712 | seq_puts(s, sklep->smk_label->smk_known); | |
2713 | seq_putc(s, ' '); | |
2714 | ||
2715 | return 0; | |
2716 | } | |
2717 | ||
2718 | static const struct seq_operations relabel_self_seq_ops = { | |
2719 | .start = relabel_self_seq_start, | |
2720 | .next = relabel_self_seq_next, | |
2721 | .show = relabel_self_seq_show, | |
2722 | .stop = smk_seq_stop, | |
2723 | }; | |
2724 | ||
2725 | /** | |
2726 | * smk_open_relabel_self - open() for /smack/relabel-self | |
2727 | * @inode: inode structure representing file | |
2728 | * @file: "relabel-self" file pointer | |
2729 | * | |
2730 | * Connect our relabel_self_seq_* operations with /smack/relabel-self | |
2731 | * file_operations | |
2732 | */ | |
2733 | static int smk_open_relabel_self(struct inode *inode, struct file *file) | |
2734 | { | |
2735 | return seq_open(file, &relabel_self_seq_ops); | |
2736 | } | |
2737 | ||
2738 | /** | |
2739 | * smk_write_relabel_self - write() for /smack/relabel-self | |
2740 | * @file: file pointer, not actually used | |
2741 | * @buf: where to get the data from | |
2742 | * @count: bytes sent | |
2743 | * @ppos: where to start - must be 0 | |
2744 | * | |
2745 | */ | |
2746 | static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, | |
2747 | size_t count, loff_t *ppos) | |
2748 | { | |
38416e53 ZJ |
2749 | char *data; |
2750 | int rc; | |
2751 | LIST_HEAD(list_tmp); | |
2752 | ||
2753 | /* | |
2754 | * Must have privilege. | |
2755 | */ | |
2756 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2757 | return -EPERM; | |
2758 | ||
2759 | /* | |
7ef4c19d | 2760 | * No partial write. |
38416e53 ZJ |
2761 | * Enough data must be present. |
2762 | */ | |
2763 | if (*ppos != 0) | |
2764 | return -EINVAL; | |
7ef4c19d ST |
2765 | if (count == 0 || count > PAGE_SIZE) |
2766 | return -EINVAL; | |
38416e53 | 2767 | |
16e5c1fc AV |
2768 | data = memdup_user_nul(buf, count); |
2769 | if (IS_ERR(data)) | |
2770 | return PTR_ERR(data); | |
38416e53 ZJ |
2771 | |
2772 | rc = smk_parse_label_list(data, &list_tmp); | |
2773 | kfree(data); | |
2774 | ||
2775 | if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { | |
beb4ee67 EB |
2776 | struct cred *new; |
2777 | struct task_smack *tsp; | |
2778 | ||
2779 | new = prepare_creds(); | |
2780 | if (!new) { | |
2781 | rc = -ENOMEM; | |
2782 | goto out; | |
2783 | } | |
2784 | tsp = smack_cred(new); | |
38416e53 ZJ |
2785 | smk_destroy_label_list(&tsp->smk_relabel); |
2786 | list_splice(&list_tmp, &tsp->smk_relabel); | |
beb4ee67 | 2787 | commit_creds(new); |
38416e53 ZJ |
2788 | return count; |
2789 | } | |
beb4ee67 | 2790 | out: |
38416e53 ZJ |
2791 | smk_destroy_label_list(&list_tmp); |
2792 | return rc; | |
2793 | } | |
2794 | ||
2795 | static const struct file_operations smk_relabel_self_ops = { | |
2796 | .open = smk_open_relabel_self, | |
2797 | .read = seq_read, | |
2798 | .llseek = seq_lseek, | |
2799 | .write = smk_write_relabel_self, | |
2800 | .release = seq_release, | |
2801 | }; | |
00f84f3f | 2802 | |
66867818 LP |
2803 | /** |
2804 | * smk_read_ptrace - read() for /smack/ptrace | |
2805 | * @filp: file pointer, not actually used | |
2806 | * @buf: where to put the result | |
2807 | * @count: maximum to send along | |
2808 | * @ppos: where to start | |
2809 | * | |
2810 | * Returns number of bytes read or error code, as appropriate | |
2811 | */ | |
2812 | static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, | |
2813 | size_t count, loff_t *ppos) | |
2814 | { | |
2815 | char temp[32]; | |
2816 | ssize_t rc; | |
2817 | ||
2818 | if (*ppos != 0) | |
2819 | return 0; | |
2820 | ||
2821 | sprintf(temp, "%d\n", smack_ptrace_rule); | |
2822 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
2823 | return rc; | |
2824 | } | |
2825 | ||
2826 | /** | |
2827 | * smk_write_ptrace - write() for /smack/ptrace | |
2828 | * @file: file pointer | |
2829 | * @buf: data from user space | |
2830 | * @count: bytes sent | |
2831 | * @ppos: where to start - must be 0 | |
2832 | */ | |
2833 | static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, | |
2834 | size_t count, loff_t *ppos) | |
2835 | { | |
2836 | char temp[32]; | |
2837 | int i; | |
2838 | ||
2839 | if (!smack_privileged(CAP_MAC_ADMIN)) | |
2840 | return -EPERM; | |
2841 | ||
2842 | if (*ppos != 0 || count >= sizeof(temp) || count == 0) | |
2843 | return -EINVAL; | |
2844 | ||
2845 | if (copy_from_user(temp, buf, count) != 0) | |
2846 | return -EFAULT; | |
2847 | ||
2848 | temp[count] = '\0'; | |
2849 | ||
2850 | if (sscanf(temp, "%d", &i) != 1) | |
2851 | return -EINVAL; | |
2852 | if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) | |
2853 | return -EINVAL; | |
2854 | smack_ptrace_rule = i; | |
2855 | ||
2856 | return count; | |
2857 | } | |
2858 | ||
2859 | static const struct file_operations smk_ptrace_ops = { | |
2860 | .write = smk_write_ptrace, | |
2861 | .read = smk_read_ptrace, | |
2862 | .llseek = default_llseek, | |
2863 | }; | |
2864 | ||
00f84f3f CS |
2865 | /** |
2866 | * smk_fill_super - fill the smackfs superblock | |
e114e473 | 2867 | * @sb: the empty superblock |
5afdd0f1 | 2868 | * @fc: unused |
e114e473 | 2869 | * |
00f84f3f | 2870 | * Fill in the well known entries for the smack filesystem |
e114e473 CS |
2871 | * |
2872 | * Returns 0 on success, an error code on failure | |
2873 | */ | |
5afdd0f1 | 2874 | static int smk_fill_super(struct super_block *sb, struct fs_context *fc) |
e114e473 CS |
2875 | { |
2876 | int rc; | |
e114e473 | 2877 | |
cda37124 | 2878 | static const struct tree_descr smack_files[] = { |
7898e1f8 CS |
2879 | [SMK_LOAD] = { |
2880 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2881 | [SMK_CIPSO] = { | |
2882 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2883 | [SMK_DOI] = { | |
2884 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2885 | [SMK_DIRECT] = { | |
2886 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2887 | [SMK_AMBIENT] = { | |
2888 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
21abb1ec CS |
2889 | [SMK_NET4ADDR] = { |
2890 | "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2891 | [SMK_ONLYCAP] = { |
2892 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2893 | [SMK_LOGGING] = { | |
2894 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2895 | [SMK_LOAD_SELF] = { | |
2896 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2897 | [SMK_ACCESSES] = { |
0e94ae17 | 2898 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2899 | [SMK_MAPPED] = { |
2900 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2901 | [SMK_LOAD2] = { | |
2902 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2903 | [SMK_LOAD_SELF2] = { | |
2904 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2905 | [SMK_ACCESS2] = { | |
2906 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2907 | [SMK_CIPSO2] = { | |
2908 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
449543b0 RK |
2909 | [SMK_REVOKE_SUBJ] = { |
2910 | "revoke-subject", &smk_revoke_subj_ops, | |
2911 | S_IRUGO|S_IWUSR}, | |
e05b6f98 RK |
2912 | [SMK_CHANGE_RULE] = { |
2913 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, | |
00f84f3f CS |
2914 | [SMK_SYSLOG] = { |
2915 | "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, | |
66867818 LP |
2916 | [SMK_PTRACE] = { |
2917 | "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, | |
bf4b2fee CS |
2918 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2919 | [SMK_UNCONFINED] = { | |
2920 | "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, | |
2921 | #endif | |
21abb1ec CS |
2922 | #if IS_ENABLED(CONFIG_IPV6) |
2923 | [SMK_NET6ADDR] = { | |
2924 | "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR}, | |
2925 | #endif /* CONFIG_IPV6 */ | |
38416e53 ZJ |
2926 | [SMK_RELABEL_SELF] = { |
2927 | "relabel-self", &smk_relabel_self_ops, | |
2928 | S_IRUGO|S_IWUGO}, | |
7898e1f8 CS |
2929 | /* last one */ |
2930 | {""} | |
e114e473 CS |
2931 | }; |
2932 | ||
2933 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2934 | if (rc != 0) { | |
2935 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2936 | __func__, rc); | |
2937 | return rc; | |
2938 | } | |
2939 | ||
e114e473 CS |
2940 | return 0; |
2941 | } | |
2942 | ||
2943 | /** | |
5afdd0f1 DH |
2944 | * smk_get_tree - get the smackfs superblock |
2945 | * @fc: The mount context, including any options | |
e114e473 CS |
2946 | * |
2947 | * Just passes everything along. | |
2948 | * | |
2949 | * Returns what the lower level code does. | |
2950 | */ | |
5afdd0f1 | 2951 | static int smk_get_tree(struct fs_context *fc) |
e114e473 | 2952 | { |
5afdd0f1 DH |
2953 | return get_tree_single(fc, smk_fill_super); |
2954 | } | |
2955 | ||
2956 | static const struct fs_context_operations smk_context_ops = { | |
2957 | .get_tree = smk_get_tree, | |
2958 | }; | |
2959 | ||
2960 | /** | |
2961 | * smk_init_fs_context - Initialise a filesystem context for smackfs | |
2962 | * @fc: The blank mount context | |
2963 | */ | |
2964 | static int smk_init_fs_context(struct fs_context *fc) | |
2965 | { | |
2966 | fc->ops = &smk_context_ops; | |
2967 | return 0; | |
e114e473 CS |
2968 | } |
2969 | ||
2970 | static struct file_system_type smk_fs_type = { | |
2971 | .name = "smackfs", | |
5afdd0f1 | 2972 | .init_fs_context = smk_init_fs_context, |
e114e473 CS |
2973 | .kill_sb = kill_litter_super, |
2974 | }; | |
2975 | ||
2976 | static struct vfsmount *smackfs_mount; | |
2977 | ||
2978 | /** | |
2979 | * init_smk_fs - get the smackfs superblock | |
2980 | * | |
2981 | * register the smackfs | |
2982 | * | |
076c54c5 AD |
2983 | * Do not register smackfs if Smack wasn't enabled |
2984 | * on boot. We can not put this method normally under the | |
2985 | * smack_init() code path since the security subsystem get | |
2986 | * initialized before the vfs caches. | |
2987 | * | |
2988 | * Returns true if we were not chosen on boot or if | |
2989 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2990 | */ |
2991 | static int __init init_smk_fs(void) | |
2992 | { | |
2993 | int err; | |
f7112e6c | 2994 | int rc; |
e114e473 | 2995 | |
d21b7b04 | 2996 | if (smack_enabled == 0) |
076c54c5 AD |
2997 | return 0; |
2998 | ||
e9307237 CS |
2999 | err = smk_init_sysfs(); |
3000 | if (err) | |
3001 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); | |
3002 | ||
e114e473 CS |
3003 | err = register_filesystem(&smk_fs_type); |
3004 | if (!err) { | |
3005 | smackfs_mount = kern_mount(&smk_fs_type); | |
3006 | if (IS_ERR(smackfs_mount)) { | |
3007 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
3008 | err = PTR_ERR(smackfs_mount); | |
3009 | smackfs_mount = NULL; | |
3010 | } | |
3011 | } | |
3012 | ||
e114e473 | 3013 | smk_cipso_doi(); |
4bc87e62 | 3014 | smk_unlbl_ambient(NULL); |
e114e473 | 3015 | |
322dd63c | 3016 | rc = smack_populate_secattr(&smack_known_floor); |
f7112e6c CS |
3017 | if (err == 0 && rc < 0) |
3018 | err = rc; | |
322dd63c | 3019 | rc = smack_populate_secattr(&smack_known_hat); |
f7112e6c CS |
3020 | if (err == 0 && rc < 0) |
3021 | err = rc; | |
322dd63c | 3022 | rc = smack_populate_secattr(&smack_known_huh); |
f7112e6c CS |
3023 | if (err == 0 && rc < 0) |
3024 | err = rc; | |
322dd63c | 3025 | rc = smack_populate_secattr(&smack_known_star); |
f7112e6c CS |
3026 | if (err == 0 && rc < 0) |
3027 | err = rc; | |
322dd63c | 3028 | rc = smack_populate_secattr(&smack_known_web); |
f7112e6c CS |
3029 | if (err == 0 && rc < 0) |
3030 | err = rc; | |
3031 | ||
e114e473 CS |
3032 | return err; |
3033 | } | |
3034 | ||
3035 | __initcall(init_smk_fs); |