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Casey Schauflere114e472008-02-04 22:29:50 -08001/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Authors:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
11 *
12 * Special thanks to the authors of selinuxfs.
13 *
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/vmalloc.h>
21#include <linux/security.h>
22#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Casey Schaufler6d3dc072008-12-31 12:54:12 -050024#include <net/net_namespace.h>
Casey Schauflere114e472008-02-04 22:29:50 -080025#include <net/cipso_ipv4.h>
26#include <linux/seq_file.h>
27#include <linux/ctype.h>
Casey Schaufler4bc87e62008-02-15 15:24:25 -080028#include <linux/audit.h>
Casey Schaufler958d2c22013-04-02 11:41:18 -070029#include <linux/magic.h>
Casey Schauflere114e472008-02-04 22:29:50 -080030#include "smack.h"
31
32/*
33 * smackfs pseudo filesystem.
34 */
35
36enum smk_inos {
37 SMK_ROOT_INO = 2,
38 SMK_LOAD = 3, /* load policy */
39 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
40 SMK_DOI = 5, /* CIPSO DOI */
41 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
42 SMK_AMBIENT = 7, /* internet ambient label */
Casey Schaufler6d3dc072008-12-31 12:54:12 -050043 SMK_NETLBLADDR = 8, /* single label hosts */
Casey Schaufler15446232008-07-30 15:37:11 -070044 SMK_ONLYCAP = 9, /* the only "capable" label */
Etienne Bassetecfcc532009-04-08 20:40:06 +020045 SMK_LOGGING = 10, /* logging */
Casey Schaufler7898e1f2011-01-17 08:05:27 -080046 SMK_LOAD_SELF = 11, /* task specific rules */
Jarkko Sakkinen828716c2011-09-08 10:12:01 +030047 SMK_ACCESSES = 12, /* access policy */
Casey Schauflerf7112e62012-05-06 15:22:02 -070048 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
49 SMK_LOAD2 = 14, /* load policy with long labels */
50 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
51 SMK_ACCESS2 = 16, /* make an access check with long labels */
52 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
Rafal Krypa449543b2012-07-11 17:49:30 +020053 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
Rafal Krypae05b6f92013-01-10 19:42:00 +010054 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
Casey Schaufler00f84f32013-12-23 11:07:10 -080055 SMK_SYSLOG = 20, /* change syslog label) */
Casey Schauflere114e472008-02-04 22:29:50 -080056};
57
58/*
59 * List locks
60 */
Casey Schauflere114e472008-02-04 22:29:50 -080061static DEFINE_MUTEX(smack_cipso_lock);
Casey Schaufler4bc87e62008-02-15 15:24:25 -080062static DEFINE_MUTEX(smack_ambient_lock);
Casey Schaufler00f84f32013-12-23 11:07:10 -080063static DEFINE_MUTEX(smack_syslog_lock);
Casey Schaufler6d3dc072008-12-31 12:54:12 -050064static DEFINE_MUTEX(smk_netlbladdr_lock);
Casey Schauflere114e472008-02-04 22:29:50 -080065
66/*
67 * This is the "ambient" label for network traffic.
68 * If it isn't somehow marked, use this.
69 * It can be reset via smackfs/ambient
70 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -070071struct smack_known *smack_net_ambient;
Casey Schauflere114e472008-02-04 22:29:50 -080072
73/*
Casey Schauflere114e472008-02-04 22:29:50 -080074 * This is the level in a CIPSO header that indicates a
75 * smack label is contained directly in the category set.
76 * It can be reset via smackfs/direct
77 */
78int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
79
Casey Schaufler15446232008-07-30 15:37:11 -070080/*
Casey Schauflerf7112e62012-05-06 15:22:02 -070081 * This is the level in a CIPSO header that indicates a
82 * secid is contained directly in the category set.
83 * It can be reset via smackfs/mapped
84 */
85int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
86
87/*
Casey Schaufler15446232008-07-30 15:37:11 -070088 * Unless a process is running with this label even
89 * having CAP_MAC_OVERRIDE isn't enough to grant
90 * privilege to violate MAC policy. If no label is
91 * designated (the NULL case) capabilities apply to
92 * everyone. It is expected that the hat (^) label
93 * will be used if any label is used.
94 */
Casey Schaufler00f84f32013-12-23 11:07:10 -080095struct smack_known *smack_onlycap;
96
97/*
98 * If this value is set restrict syslog use to the label specified.
99 * It can be reset via smackfs/syslog
100 */
101struct smack_known *smack_syslog_label;
Casey Schaufler15446232008-07-30 15:37:11 -0700102
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500103/*
104 * Certain IP addresses may be designated as single label hosts.
105 * Packets are sent there unlabeled, but only from tasks that
106 * can write to the specified label.
107 */
Etienne Basset7198e2e2009-03-24 20:53:24 +0100108
109LIST_HEAD(smk_netlbladdr_list);
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700110
111/*
112 * Rule lists are maintained for each label.
Casey Schauflerf7112e62012-05-06 15:22:02 -0700113 * This master list is just for reading /smack/load and /smack/load2.
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700114 */
115struct smack_master_list {
116 struct list_head list;
117 struct smack_rule *smk_rule;
118};
119
Etienne Basset7198e2e2009-03-24 20:53:24 +0100120LIST_HEAD(smack_rule_list);
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500121
Rafal Krypae05b6f92013-01-10 19:42:00 +0100122struct smack_parsed_rule {
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700123 struct smack_known *smk_subject;
Rafal Krypae05b6f92013-01-10 19:42:00 +0100124 char *smk_object;
125 int smk_access1;
126 int smk_access2;
127};
128
Casey Schauflere114e472008-02-04 22:29:50 -0800129static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
Casey Schauflere114e472008-02-04 22:29:50 -0800130
Etienne Basset43031542009-03-27 17:11:01 -0400131const char *smack_cipso_option = SMACK_CIPSO_OPTION;
132
Casey Schauflere114e472008-02-04 22:29:50 -0800133/*
Casey Schauflere114e472008-02-04 22:29:50 -0800134 * Values for parsing cipso rules
135 * SMK_DIGITLEN: Length of a digit field in a rule.
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700136 * SMK_CIPSOMIN: Minimum possible cipso rule length.
137 * SMK_CIPSOMAX: Maximum possible cipso rule length.
Casey Schauflere114e472008-02-04 22:29:50 -0800138 */
139#define SMK_DIGITLEN 4
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700140#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
141#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
142
143/*
144 * Values for parsing MAC rules
145 * SMK_ACCESS: Maximum possible combination of access permissions
146 * SMK_ACCESSLEN: Maximum length for a rule access field
147 * SMK_LOADLEN: Smack rule length
148 */
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200149#define SMK_OACCESS "rwxa"
Casey Schauflerc0ab6e52013-10-11 18:06:39 -0700150#define SMK_ACCESS "rwxatl"
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200151#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
152#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
153#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
154#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700155
Casey Schauflerf7112e62012-05-06 15:22:02 -0700156/*
157 * Stricly for CIPSO level manipulation.
158 * Set the category bit number in a smack label sized buffer.
159 */
160static inline void smack_catset_bit(unsigned int cat, char *catsetp)
161{
162 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
163 return;
164
165 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
166}
167
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500168/**
169 * smk_netlabel_audit_set - fill a netlbl_audit struct
170 * @nap: structure to fill
171 */
172static void smk_netlabel_audit_set(struct netlbl_audit *nap)
173{
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700174 struct smack_known *skp = smk_of_current();
175
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500176 nap->loginuid = audit_get_loginuid(current);
177 nap->sessionid = audit_get_sessionid(current);
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700178 nap->secid = skp->smk_secid;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500179}
180
181/*
Casey Schauflerf7112e62012-05-06 15:22:02 -0700182 * Value for parsing single label host rules
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500183 * "1.2.3.4 X"
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500184 */
185#define SMK_NETLBLADDRMIN 9
Casey Schauflere114e472008-02-04 22:29:50 -0800186
Casey Schauflere114e472008-02-04 22:29:50 -0800187/**
Rafal Krypae05b6f92013-01-10 19:42:00 +0100188 * smk_set_access - add a rule to the rule list or replace an old rule
189 * @srp: the rule to add or replace
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800190 * @rule_list: the list of rules
191 * @rule_lock: the rule list lock
Rafal Krypae05b6f92013-01-10 19:42:00 +0100192 * @global: if non-zero, indicates a global rule
Casey Schauflere114e472008-02-04 22:29:50 -0800193 *
194 * Looks through the current subject/object/access list for
195 * the subject/object pair and replaces the access that was
196 * there. If the pair isn't found add it with the specified
197 * access.
Sergio Luis81ea7142008-12-22 01:16:15 -0300198 *
199 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
200 * during the allocation of the new pair to add.
Casey Schauflere114e472008-02-04 22:29:50 -0800201 */
Rafal Krypae05b6f92013-01-10 19:42:00 +0100202static int smk_set_access(struct smack_parsed_rule *srp,
203 struct list_head *rule_list,
204 struct mutex *rule_lock, int global)
Casey Schauflere114e472008-02-04 22:29:50 -0800205{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100206 struct smack_rule *sp;
Rafal Krypae05b6f92013-01-10 19:42:00 +0100207 struct smack_master_list *smlp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800208 int found = 0;
Rafal Krypae05b6f92013-01-10 19:42:00 +0100209 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800210
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800211 mutex_lock(rule_lock);
212
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700213 /*
214 * Because the object label is less likely to match
215 * than the subject label check it first
216 */
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800217 list_for_each_entry_rcu(sp, rule_list, list) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700218 if (sp->smk_object == srp->smk_object &&
219 sp->smk_subject == srp->smk_subject) {
Etienne Basset7198e2e2009-03-24 20:53:24 +0100220 found = 1;
Rafal Krypae05b6f92013-01-10 19:42:00 +0100221 sp->smk_access |= srp->smk_access1;
222 sp->smk_access &= ~srp->smk_access2;
Casey Schauflere114e472008-02-04 22:29:50 -0800223 break;
224 }
Casey Schauflere114e472008-02-04 22:29:50 -0800225 }
226
Rafal Krypae05b6f92013-01-10 19:42:00 +0100227 if (found == 0) {
228 sp = kzalloc(sizeof(*sp), GFP_KERNEL);
229 if (sp == NULL) {
230 rc = -ENOMEM;
231 goto out;
232 }
233
234 sp->smk_subject = srp->smk_subject;
235 sp->smk_object = srp->smk_object;
236 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
237
238 list_add_rcu(&sp->list, rule_list);
239 /*
240 * If this is a global as opposed to self and a new rule
241 * it needs to get added for reporting.
242 */
243 if (global) {
244 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
245 if (smlp != NULL) {
246 smlp->smk_rule = sp;
247 list_add_rcu(&smlp->list, &smack_rule_list);
248 } else
249 rc = -ENOMEM;
250 }
251 }
252
253out:
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800254 mutex_unlock(rule_lock);
Rafal Krypae05b6f92013-01-10 19:42:00 +0100255 return rc;
256}
Casey Schauflere114e472008-02-04 22:29:50 -0800257
Rafal Krypae05b6f92013-01-10 19:42:00 +0100258/**
259 * smk_perm_from_str - parse smack accesses from a text string
260 * @string: a text string that contains a Smack accesses code
261 *
262 * Returns an integer with respective bits set for specified accesses.
263 */
264static int smk_perm_from_str(const char *string)
265{
266 int perm = 0;
267 const char *cp;
268
269 for (cp = string; ; cp++)
270 switch (*cp) {
271 case '-':
272 break;
273 case 'r':
274 case 'R':
275 perm |= MAY_READ;
276 break;
277 case 'w':
278 case 'W':
279 perm |= MAY_WRITE;
280 break;
281 case 'x':
282 case 'X':
283 perm |= MAY_EXEC;
284 break;
285 case 'a':
286 case 'A':
287 perm |= MAY_APPEND;
288 break;
289 case 't':
290 case 'T':
291 perm |= MAY_TRANSMUTE;
292 break;
Casey Schauflerc0ab6e52013-10-11 18:06:39 -0700293 case 'l':
294 case 'L':
295 perm |= MAY_LOCK;
296 break;
Rafal Krypae05b6f92013-01-10 19:42:00 +0100297 default:
298 return perm;
299 }
Casey Schauflere114e472008-02-04 22:29:50 -0800300}
301
302/**
Casey Schauflerf7112e62012-05-06 15:22:02 -0700303 * smk_fill_rule - Fill Smack rule from strings
304 * @subject: subject label string
305 * @object: object label string
Rafal Krypae05b6f92013-01-10 19:42:00 +0100306 * @access1: access string
307 * @access2: string with permissions to be removed
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300308 * @rule: Smack rule
309 * @import: if non-zero, import labels
Casey Schaufler35187212012-06-18 19:01:36 -0700310 * @len: label length limit
Casey Schauflerf7112e62012-05-06 15:22:02 -0700311 *
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200312 * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject
313 * or object is missing.
Jarkko Sakkinen828716c2011-09-08 10:12:01 +0300314 */
Casey Schauflerf7112e62012-05-06 15:22:02 -0700315static int smk_fill_rule(const char *subject, const char *object,
Rafal Krypae05b6f92013-01-10 19:42:00 +0100316 const char *access1, const char *access2,
317 struct smack_parsed_rule *rule, int import,
318 int len)
Jarkko Sakkinen828716c2011-09-08 10:12:01 +0300319{
Casey Schauflerf7112e62012-05-06 15:22:02 -0700320 const char *cp;
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300321 struct smack_known *skp;
Jarkko Sakkinen828716c2011-09-08 10:12:01 +0300322
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300323 if (import) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700324 rule->smk_subject = smk_import_entry(subject, len);
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300325 if (rule->smk_subject == NULL)
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200326 return -EINVAL;
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300327
Casey Schaufler35187212012-06-18 19:01:36 -0700328 rule->smk_object = smk_import(object, len);
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300329 if (rule->smk_object == NULL)
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200330 return -EINVAL;
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300331 } else {
Casey Schaufler35187212012-06-18 19:01:36 -0700332 cp = smk_parse_smack(subject, len);
Casey Schauflerf7112e62012-05-06 15:22:02 -0700333 if (cp == NULL)
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200334 return -EINVAL;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700335 skp = smk_find_entry(cp);
336 kfree(cp);
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300337 if (skp == NULL)
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200338 return -ENOENT;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700339 rule->smk_subject = skp;
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300340
Casey Schaufler35187212012-06-18 19:01:36 -0700341 cp = smk_parse_smack(object, len);
Casey Schauflerf7112e62012-05-06 15:22:02 -0700342 if (cp == NULL)
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200343 return -EINVAL;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700344 skp = smk_find_entry(cp);
345 kfree(cp);
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300346 if (skp == NULL)
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200347 return -ENOENT;
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +0300348 rule->smk_object = skp->smk_known;
349 }
Jarkko Sakkinen828716c2011-09-08 10:12:01 +0300350
Rafal Krypae05b6f92013-01-10 19:42:00 +0100351 rule->smk_access1 = smk_perm_from_str(access1);
352 if (access2)
353 rule->smk_access2 = smk_perm_from_str(access2);
354 else
355 rule->smk_access2 = ~rule->smk_access1;
Jarkko Sakkinen828716c2011-09-08 10:12:01 +0300356
Casey Schaufler35187212012-06-18 19:01:36 -0700357 return 0;
Jarkko Sakkinen828716c2011-09-08 10:12:01 +0300358}
359
360/**
Casey Schauflerf7112e62012-05-06 15:22:02 -0700361 * smk_parse_rule - parse Smack rule from load string
362 * @data: string to be parsed whose size is SMK_LOADLEN
363 * @rule: Smack rule
364 * @import: if non-zero, import labels
365 *
366 * Returns 0 on success, -1 on errors.
367 */
Rafal Krypae05b6f92013-01-10 19:42:00 +0100368static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
369 int import)
Casey Schauflerf7112e62012-05-06 15:22:02 -0700370{
371 int rc;
372
373 rc = smk_fill_rule(data, data + SMK_LABELLEN,
Rafal Krypae05b6f92013-01-10 19:42:00 +0100374 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
375 import, SMK_LABELLEN);
Casey Schauflerf7112e62012-05-06 15:22:02 -0700376 return rc;
377}
378
379/**
380 * smk_parse_long_rule - parse Smack rule from rule string
381 * @data: string to be parsed, null terminated
Rafal Krypae05b6f92013-01-10 19:42:00 +0100382 * @rule: Will be filled with Smack parsed rule
Casey Schauflerf7112e62012-05-06 15:22:02 -0700383 * @import: if non-zero, import labels
Rafal Krypa10289b02013-08-09 11:47:07 +0200384 * @tokens: numer of substrings expected in data
Casey Schauflerf7112e62012-05-06 15:22:02 -0700385 *
Rafal Krypa10289b02013-08-09 11:47:07 +0200386 * Returns number of processed bytes on success, -1 on failure.
Casey Schauflerf7112e62012-05-06 15:22:02 -0700387 */
Rafal Krypa10289b02013-08-09 11:47:07 +0200388static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
389 int import, int tokens)
Casey Schauflerf7112e62012-05-06 15:22:02 -0700390{
Rafal Krypa10289b02013-08-09 11:47:07 +0200391 ssize_t cnt = 0;
392 char *tok[4];
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200393 int rc;
Rafal Krypa10289b02013-08-09 11:47:07 +0200394 int i;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700395
Rafal Krypa10289b02013-08-09 11:47:07 +0200396 /*
397 * Parsing the rule in-place, filling all white-spaces with '\0'
398 */
399 for (i = 0; i < tokens; ++i) {
400 while (isspace(data[cnt]))
401 data[cnt++] = '\0';
Alan Cox3b9fc372012-07-26 14:47:11 -0700402
Rafal Krypa10289b02013-08-09 11:47:07 +0200403 if (data[cnt] == '\0')
404 /* Unexpected end of data */
405 return -1;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700406
Rafal Krypa10289b02013-08-09 11:47:07 +0200407 tok[i] = data + cnt;
408
409 while (data[cnt] && !isspace(data[cnt]))
410 ++cnt;
Rafal Krypae05b6f92013-01-10 19:42:00 +0100411 }
Rafal Krypa10289b02013-08-09 11:47:07 +0200412 while (isspace(data[cnt]))
413 data[cnt++] = '\0';
Casey Schauflerf7112e62012-05-06 15:22:02 -0700414
Rafal Krypa10289b02013-08-09 11:47:07 +0200415 while (i < 4)
416 tok[i++] = NULL;
417
Jarkko Sakkinen398ce072013-11-28 19:16:46 +0200418 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
419 return rc == 0 ? cnt : rc;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700420}
421
422#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
423#define SMK_LONG_FMT 1 /* Variable long label format */
Rafal Krypae05b6f92013-01-10 19:42:00 +0100424#define SMK_CHANGE_FMT 2 /* Rule modification format */
Casey Schauflerf7112e62012-05-06 15:22:02 -0700425/**
426 * smk_write_rules_list - write() for any /smack rule file
Randy Dunlap251a2a92009-02-18 11:42:33 -0800427 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -0800428 * @buf: where to get the data from
429 * @count: bytes sent
430 * @ppos: where to start - must be 0
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800431 * @rule_list: the list of rules to write to
432 * @rule_lock: lock for the rule list
Rafal Krypae05b6f92013-01-10 19:42:00 +0100433 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
Casey Schauflere114e472008-02-04 22:29:50 -0800434 *
435 * Get one smack access rule from above.
Casey Schauflerf7112e62012-05-06 15:22:02 -0700436 * The format for SMK_LONG_FMT is:
437 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
438 * The format for SMK_FIXED24_FMT is exactly:
439 * "subject object rwxat"
Rafal Krypae05b6f92013-01-10 19:42:00 +0100440 * The format for SMK_CHANGE_FMT is:
441 * "subject<whitespace>object<whitespace>
442 * acc_enable<whitespace>acc_disable[<whitespace>...]"
Casey Schauflere114e472008-02-04 22:29:50 -0800443 */
Casey Schauflerf7112e62012-05-06 15:22:02 -0700444static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
445 size_t count, loff_t *ppos,
446 struct list_head *rule_list,
447 struct mutex *rule_lock, int format)
Casey Schauflere114e472008-02-04 22:29:50 -0800448{
Tomasz Stanislawski470043b2013-06-06 09:30:50 +0200449 struct smack_parsed_rule rule;
Casey Schauflere114e472008-02-04 22:29:50 -0800450 char *data;
Rafal Krypa10289b02013-08-09 11:47:07 +0200451 int rc;
452 int trunc = 0;
453 int tokens;
454 ssize_t cnt = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800455
456 /*
Casey Schauflere114e472008-02-04 22:29:50 -0800457 * No partial writes.
458 * Enough data must be present.
459 */
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200460 if (*ppos != 0)
461 return -EINVAL;
Casey Schauflere114e472008-02-04 22:29:50 -0800462
Casey Schauflerf7112e62012-05-06 15:22:02 -0700463 if (format == SMK_FIXED24_FMT) {
464 /*
465 * Minor hack for backward compatibility
466 */
Casey Schauflerc0ab6e52013-10-11 18:06:39 -0700467 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
Casey Schauflerf7112e62012-05-06 15:22:02 -0700468 return -EINVAL;
Rafal Krypa10289b02013-08-09 11:47:07 +0200469 } else {
470 if (count >= PAGE_SIZE) {
471 count = PAGE_SIZE - 1;
472 trunc = 1;
473 }
474 }
Casey Schauflerf7112e62012-05-06 15:22:02 -0700475
Rafal Krypa10289b02013-08-09 11:47:07 +0200476 data = kmalloc(count + 1, GFP_KERNEL);
Casey Schauflere114e472008-02-04 22:29:50 -0800477 if (data == NULL)
478 return -ENOMEM;
479
480 if (copy_from_user(data, buf, count) != 0) {
481 rc = -EFAULT;
482 goto out;
483 }
484
Rafal Krypa10289b02013-08-09 11:47:07 +0200485 /*
486 * In case of parsing only part of user buf,
487 * avoid having partial rule at the data buffer
488 */
489 if (trunc) {
490 while (count > 0 && (data[count - 1] != '\n'))
491 --count;
492 if (count == 0) {
493 rc = -EINVAL;
Tomasz Stanislawski470043b2013-06-06 09:30:50 +0200494 goto out;
Rafal Krypa10289b02013-08-09 11:47:07 +0200495 }
496 }
497
498 data[count] = '\0';
499 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
500 while (cnt < count) {
501 if (format == SMK_FIXED24_FMT) {
502 rc = smk_parse_rule(data, &rule, 1);
503 if (rc != 0) {
504 rc = -EINVAL;
505 goto out;
506 }
507 cnt = count;
508 } else {
509 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
510 if (rc <= 0) {
511 rc = -EINVAL;
512 goto out;
513 }
514 cnt += rc;
515 }
516
517 if (rule_list == NULL)
518 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
519 &rule.smk_subject->smk_rules_lock, 1);
520 else
521 rc = smk_set_access(&rule, rule_list, rule_lock, 0);
522
523 if (rc)
Tomasz Stanislawski470043b2013-06-06 09:30:50 +0200524 goto out;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700525 }
526
Rafal Krypa10289b02013-08-09 11:47:07 +0200527 rc = cnt;
Casey Schauflere114e472008-02-04 22:29:50 -0800528out:
529 kfree(data);
530 return rc;
531}
532
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800533/*
Casey Schaufler40809562011-11-10 15:02:22 -0800534 * Core logic for smackfs seq list operations.
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800535 */
536
Casey Schaufler40809562011-11-10 15:02:22 -0800537static void *smk_seq_start(struct seq_file *s, loff_t *pos,
538 struct list_head *head)
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800539{
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700540 struct list_head *list;
541
542 /*
543 * This is 0 the first time through.
544 */
545 if (s->index == 0)
Casey Schaufler40809562011-11-10 15:02:22 -0800546 s->private = head;
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700547
548 if (s->private == NULL)
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800549 return NULL;
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700550
551 list = s->private;
552 if (list_empty(list))
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800553 return NULL;
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700554
555 if (s->index == 0)
556 return list->next;
557 return list;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800558}
559
Casey Schaufler40809562011-11-10 15:02:22 -0800560static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
561 struct list_head *head)
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800562{
563 struct list_head *list = v;
564
Casey Schaufler40809562011-11-10 15:02:22 -0800565 if (list_is_last(list, head)) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700566 s->private = NULL;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800567 return NULL;
568 }
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700569 s->private = list->next;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800570 return list->next;
571}
572
Casey Schaufler40809562011-11-10 15:02:22 -0800573static void smk_seq_stop(struct seq_file *s, void *v)
574{
575 /* No-op */
576}
577
Casey Schauflerf7112e62012-05-06 15:22:02 -0700578static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
Casey Schaufler40809562011-11-10 15:02:22 -0800579{
Casey Schauflerf7112e62012-05-06 15:22:02 -0700580 /*
581 * Don't show any rules with label names too long for
582 * interface file (/smack/load or /smack/load2)
583 * because you should expect to be able to write
584 * anything you read back.
585 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700586 if (strlen(srp->smk_subject->smk_known) >= max ||
587 strlen(srp->smk_object) >= max)
Casey Schauflerf7112e62012-05-06 15:22:02 -0700588 return;
Casey Schaufler40809562011-11-10 15:02:22 -0800589
Rafal Krypa65ee7f42012-07-09 19:36:34 +0200590 if (srp->smk_access == 0)
591 return;
592
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700593 seq_printf(s, "%s %s", srp->smk_subject->smk_known, srp->smk_object);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800594
595 seq_putc(s, ' ');
596
597 if (srp->smk_access & MAY_READ)
598 seq_putc(s, 'r');
599 if (srp->smk_access & MAY_WRITE)
600 seq_putc(s, 'w');
601 if (srp->smk_access & MAY_EXEC)
602 seq_putc(s, 'x');
603 if (srp->smk_access & MAY_APPEND)
604 seq_putc(s, 'a');
605 if (srp->smk_access & MAY_TRANSMUTE)
606 seq_putc(s, 't');
Casey Schauflerc0ab6e52013-10-11 18:06:39 -0700607 if (srp->smk_access & MAY_LOCK)
608 seq_putc(s, 'l');
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800609
610 seq_putc(s, '\n');
Casey Schauflerf7112e62012-05-06 15:22:02 -0700611}
612
613/*
614 * Seq_file read operations for /smack/load
615 */
616
617static void *load2_seq_start(struct seq_file *s, loff_t *pos)
618{
619 return smk_seq_start(s, pos, &smack_rule_list);
620}
621
622static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
623{
624 return smk_seq_next(s, v, pos, &smack_rule_list);
625}
626
627static int load_seq_show(struct seq_file *s, void *v)
628{
629 struct list_head *list = v;
630 struct smack_master_list *smlp =
631 list_entry(list, struct smack_master_list, list);
632
633 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800634
635 return 0;
636}
637
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800638static const struct seq_operations load_seq_ops = {
Casey Schauflerf7112e62012-05-06 15:22:02 -0700639 .start = load2_seq_start,
640 .next = load2_seq_next,
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800641 .show = load_seq_show,
Casey Schaufler40809562011-11-10 15:02:22 -0800642 .stop = smk_seq_stop,
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800643};
644
645/**
646 * smk_open_load - open() for /smack/load
647 * @inode: inode structure representing file
648 * @file: "load" file pointer
649 *
650 * For reading, use load_seq_* seq_file reading operations.
651 */
652static int smk_open_load(struct inode *inode, struct file *file)
653{
654 return seq_open(file, &load_seq_ops);
655}
656
657/**
658 * smk_write_load - write() for /smack/load
659 * @file: file pointer, not actually used
660 * @buf: where to get the data from
661 * @count: bytes sent
662 * @ppos: where to start - must be 0
663 *
664 */
665static ssize_t smk_write_load(struct file *file, const char __user *buf,
666 size_t count, loff_t *ppos)
667{
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800668 /*
669 * Must have privilege.
670 * No partial writes.
671 * Enough data must be present.
672 */
Casey Schaufler1880eff2012-06-05 15:28:30 -0700673 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800674 return -EPERM;
675
Casey Schauflerf7112e62012-05-06 15:22:02 -0700676 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
677 SMK_FIXED24_FMT);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800678}
679
Casey Schauflere114e472008-02-04 22:29:50 -0800680static const struct file_operations smk_load_ops = {
681 .open = smk_open_load,
682 .read = seq_read,
683 .llseek = seq_lseek,
684 .write = smk_write_load,
Ahmed S. Darwishcb622bb2008-03-24 12:29:49 -0700685 .release = seq_release,
Casey Schauflere114e472008-02-04 22:29:50 -0800686};
687
688/**
689 * smk_cipso_doi - initialize the CIPSO domain
690 */
Casey Schaufler30aa4fa2008-04-28 02:13:43 -0700691static void smk_cipso_doi(void)
Casey Schauflere114e472008-02-04 22:29:50 -0800692{
693 int rc;
694 struct cipso_v4_doi *doip;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500695 struct netlbl_audit nai;
Casey Schauflere114e472008-02-04 22:29:50 -0800696
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500697 smk_netlabel_audit_set(&nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800698
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500699 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
Casey Schauflere114e472008-02-04 22:29:50 -0800700 if (rc != 0)
701 printk(KERN_WARNING "%s:%d remove rc = %d\n",
702 __func__, __LINE__, rc);
703
704 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
705 if (doip == NULL)
706 panic("smack: Failed to initialize cipso DOI.\n");
707 doip->map.std = NULL;
708 doip->doi = smk_cipso_doi_value;
709 doip->type = CIPSO_V4_MAP_PASS;
710 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
711 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
712 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
713
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500714 rc = netlbl_cfg_cipsov4_add(doip, &nai);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400715 if (rc != 0) {
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500716 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
Casey Schauflere114e472008-02-04 22:29:50 -0800717 __func__, __LINE__, rc);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400718 kfree(doip);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500719 return;
720 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500721 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500722 if (rc != 0) {
723 printk(KERN_WARNING "%s:%d map add rc = %d\n",
724 __func__, __LINE__, rc);
725 kfree(doip);
726 return;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400727 }
Casey Schauflere114e472008-02-04 22:29:50 -0800728}
729
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800730/**
731 * smk_unlbl_ambient - initialize the unlabeled domain
Randy Dunlap251a2a92009-02-18 11:42:33 -0800732 * @oldambient: previous domain string
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800733 */
Casey Schaufler30aa4fa2008-04-28 02:13:43 -0700734static void smk_unlbl_ambient(char *oldambient)
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800735{
736 int rc;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500737 struct netlbl_audit nai;
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800738
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500739 smk_netlabel_audit_set(&nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800740
741 if (oldambient != NULL) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500742 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800743 if (rc != 0)
744 printk(KERN_WARNING "%s:%d remove rc = %d\n",
745 __func__, __LINE__, rc);
746 }
Casey Schauflerf7112e62012-05-06 15:22:02 -0700747 if (smack_net_ambient == NULL)
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700748 smack_net_ambient = &smack_known_floor;
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800749
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700750 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500751 NULL, NULL, &nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800752 if (rc != 0)
753 printk(KERN_WARNING "%s:%d add rc = %d\n",
754 __func__, __LINE__, rc);
755}
756
Casey Schauflere114e472008-02-04 22:29:50 -0800757/*
758 * Seq_file read operations for /smack/cipso
759 */
760
761static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
762{
Casey Schaufler40809562011-11-10 15:02:22 -0800763 return smk_seq_start(s, pos, &smack_known_list);
Casey Schauflere114e472008-02-04 22:29:50 -0800764}
765
766static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
767{
Casey Schaufler40809562011-11-10 15:02:22 -0800768 return smk_seq_next(s, v, pos, &smack_known_list);
Casey Schauflere114e472008-02-04 22:29:50 -0800769}
770
771/*
772 * Print cipso labels in format:
773 * label level[/cat[,cat]]
774 */
775static int cipso_seq_show(struct seq_file *s, void *v)
776{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100777 struct list_head *list = v;
778 struct smack_known *skp =
779 list_entry(list, struct smack_known, list);
Casey Schauflerf7112e62012-05-06 15:22:02 -0700780 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
Casey Schauflere114e472008-02-04 22:29:50 -0800781 char sep = '/';
Casey Schauflere114e472008-02-04 22:29:50 -0800782 int i;
Casey Schauflere114e472008-02-04 22:29:50 -0800783
Casey Schauflerf7112e62012-05-06 15:22:02 -0700784 /*
785 * Don't show a label that could not have been set using
786 * /smack/cipso. This is in support of the notion that
787 * anything read from /smack/cipso ought to be writeable
788 * to /smack/cipso.
789 *
790 * /smack/cipso2 should be used instead.
791 */
792 if (strlen(skp->smk_known) >= SMK_LABELLEN)
Casey Schauflere114e472008-02-04 22:29:50 -0800793 return 0;
794
Casey Schauflerf7112e62012-05-06 15:22:02 -0700795 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
Casey Schauflere114e472008-02-04 22:29:50 -0800796
Casey Schauflerf7112e62012-05-06 15:22:02 -0700797 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
798 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
799 seq_printf(s, "%c%d", sep, i);
800 sep = ',';
801 }
Casey Schauflere114e472008-02-04 22:29:50 -0800802
803 seq_putc(s, '\n');
804
805 return 0;
806}
807
James Morris88e9d342009-09-22 16:43:43 -0700808static const struct seq_operations cipso_seq_ops = {
Casey Schauflere114e472008-02-04 22:29:50 -0800809 .start = cipso_seq_start,
Casey Schauflere114e472008-02-04 22:29:50 -0800810 .next = cipso_seq_next,
811 .show = cipso_seq_show,
Casey Schaufler40809562011-11-10 15:02:22 -0800812 .stop = smk_seq_stop,
Casey Schauflere114e472008-02-04 22:29:50 -0800813};
814
815/**
816 * smk_open_cipso - open() for /smack/cipso
817 * @inode: inode structure representing file
818 * @file: "cipso" file pointer
819 *
820 * Connect our cipso_seq_* operations with /smack/cipso
821 * file_operations
822 */
823static int smk_open_cipso(struct inode *inode, struct file *file)
824{
825 return seq_open(file, &cipso_seq_ops);
826}
827
828/**
Casey Schauflerf7112e62012-05-06 15:22:02 -0700829 * smk_set_cipso - do the work for write() for cipso and cipso2
Randy Dunlap251a2a92009-02-18 11:42:33 -0800830 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -0800831 * @buf: where to get the data from
832 * @count: bytes sent
833 * @ppos: where to start
Casey Schauflerf7112e62012-05-06 15:22:02 -0700834 * @format: /smack/cipso or /smack/cipso2
Casey Schauflere114e472008-02-04 22:29:50 -0800835 *
836 * Accepts only one cipso rule per write call.
837 * Returns number of bytes written or error code, as appropriate
838 */
Casey Schauflerf7112e62012-05-06 15:22:02 -0700839static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
840 size_t count, loff_t *ppos, int format)
Casey Schauflere114e472008-02-04 22:29:50 -0800841{
842 struct smack_known *skp;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700843 struct netlbl_lsm_secattr ncats;
844 char mapcatset[SMK_CIPSOLEN];
Casey Schauflere114e472008-02-04 22:29:50 -0800845 int maplevel;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700846 unsigned int cat;
Casey Schauflere114e472008-02-04 22:29:50 -0800847 int catlen;
848 ssize_t rc = -EINVAL;
849 char *data = NULL;
850 char *rule;
851 int ret;
852 int i;
853
854 /*
855 * Must have privilege.
856 * No partial writes.
857 * Enough data must be present.
858 */
Casey Schaufler1880eff2012-06-05 15:28:30 -0700859 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflere114e472008-02-04 22:29:50 -0800860 return -EPERM;
861 if (*ppos != 0)
862 return -EINVAL;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700863 if (format == SMK_FIXED24_FMT &&
864 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
Casey Schauflere114e472008-02-04 22:29:50 -0800865 return -EINVAL;
866
867 data = kzalloc(count + 1, GFP_KERNEL);
868 if (data == NULL)
869 return -ENOMEM;
870
871 if (copy_from_user(data, buf, count) != 0) {
872 rc = -EFAULT;
873 goto unlockedout;
874 }
875
876 data[count] = '\0';
877 rule = data;
878 /*
879 * Only allow one writer at a time. Writes should be
880 * quite rare and small in any case.
881 */
882 mutex_lock(&smack_cipso_lock);
883
884 skp = smk_import_entry(rule, 0);
885 if (skp == NULL)
886 goto out;
887
Casey Schauflerf7112e62012-05-06 15:22:02 -0700888 if (format == SMK_FIXED24_FMT)
889 rule += SMK_LABELLEN;
890 else
Passion,Zhao0fcfee62013-06-03 11:42:24 +0800891 rule += strlen(skp->smk_known) + 1;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700892
Casey Schauflere114e472008-02-04 22:29:50 -0800893 ret = sscanf(rule, "%d", &maplevel);
894 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
895 goto out;
896
897 rule += SMK_DIGITLEN;
898 ret = sscanf(rule, "%d", &catlen);
899 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
900 goto out;
901
Casey Schauflerf7112e62012-05-06 15:22:02 -0700902 if (format == SMK_FIXED24_FMT &&
903 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
Casey Schauflere114e472008-02-04 22:29:50 -0800904 goto out;
905
906 memset(mapcatset, 0, sizeof(mapcatset));
907
908 for (i = 0; i < catlen; i++) {
909 rule += SMK_DIGITLEN;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700910 ret = sscanf(rule, "%u", &cat);
Casey Schaufler677264e2013-06-28 13:47:07 -0700911 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
Casey Schauflere114e472008-02-04 22:29:50 -0800912 goto out;
913
914 smack_catset_bit(cat, mapcatset);
915 }
916
Casey Schauflerf7112e62012-05-06 15:22:02 -0700917 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
918 if (rc >= 0) {
919 netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat);
920 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
921 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
922 rc = count;
Casey Schauflere114e472008-02-04 22:29:50 -0800923 }
924
Casey Schauflere114e472008-02-04 22:29:50 -0800925out:
926 mutex_unlock(&smack_cipso_lock);
927unlockedout:
928 kfree(data);
929 return rc;
930}
931
Casey Schauflerf7112e62012-05-06 15:22:02 -0700932/**
933 * smk_write_cipso - write() for /smack/cipso
934 * @file: file pointer, not actually used
935 * @buf: where to get the data from
936 * @count: bytes sent
937 * @ppos: where to start
938 *
939 * Accepts only one cipso rule per write call.
940 * Returns number of bytes written or error code, as appropriate
941 */
942static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
943 size_t count, loff_t *ppos)
944{
945 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
946}
947
Casey Schauflere114e472008-02-04 22:29:50 -0800948static const struct file_operations smk_cipso_ops = {
949 .open = smk_open_cipso,
950 .read = seq_read,
951 .llseek = seq_lseek,
952 .write = smk_write_cipso,
953 .release = seq_release,
954};
955
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500956/*
Casey Schauflerf7112e62012-05-06 15:22:02 -0700957 * Seq_file read operations for /smack/cipso2
958 */
959
960/*
961 * Print cipso labels in format:
962 * label level[/cat[,cat]]
963 */
964static int cipso2_seq_show(struct seq_file *s, void *v)
965{
966 struct list_head *list = v;
967 struct smack_known *skp =
968 list_entry(list, struct smack_known, list);
969 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
970 char sep = '/';
971 int i;
972
973 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
974
975 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
976 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
977 seq_printf(s, "%c%d", sep, i);
978 sep = ',';
979 }
980
981 seq_putc(s, '\n');
982
983 return 0;
984}
985
986static const struct seq_operations cipso2_seq_ops = {
987 .start = cipso_seq_start,
988 .next = cipso_seq_next,
989 .show = cipso2_seq_show,
990 .stop = smk_seq_stop,
991};
992
993/**
994 * smk_open_cipso2 - open() for /smack/cipso2
995 * @inode: inode structure representing file
996 * @file: "cipso2" file pointer
997 *
998 * Connect our cipso_seq_* operations with /smack/cipso2
999 * file_operations
1000 */
1001static int smk_open_cipso2(struct inode *inode, struct file *file)
1002{
1003 return seq_open(file, &cipso2_seq_ops);
1004}
1005
1006/**
1007 * smk_write_cipso2 - write() for /smack/cipso2
1008 * @file: file pointer, not actually used
1009 * @buf: where to get the data from
1010 * @count: bytes sent
1011 * @ppos: where to start
1012 *
1013 * Accepts only one cipso rule per write call.
1014 * Returns number of bytes written or error code, as appropriate
1015 */
1016static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1017 size_t count, loff_t *ppos)
1018{
1019 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1020}
1021
1022static const struct file_operations smk_cipso2_ops = {
1023 .open = smk_open_cipso2,
1024 .read = seq_read,
1025 .llseek = seq_lseek,
1026 .write = smk_write_cipso2,
1027 .release = seq_release,
1028};
1029
1030/*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001031 * Seq_file read operations for /smack/netlabel
1032 */
1033
1034static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
1035{
Casey Schaufler40809562011-11-10 15:02:22 -08001036 return smk_seq_start(s, pos, &smk_netlbladdr_list);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001037}
1038
1039static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1040{
Casey Schaufler40809562011-11-10 15:02:22 -08001041 return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001042}
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001043#define BEBITS (sizeof(__be32) * 8)
1044
1045/*
1046 * Print host/label pairs
1047 */
1048static int netlbladdr_seq_show(struct seq_file *s, void *v)
1049{
Etienne Basset7198e2e2009-03-24 20:53:24 +01001050 struct list_head *list = v;
1051 struct smk_netlbladdr *skp =
1052 list_entry(list, struct smk_netlbladdr, list);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001053 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
etienne113a0e42009-03-04 07:33:51 +01001054 int maskn;
1055 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001056
etienne113a0e42009-03-04 07:33:51 +01001057 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001058
1059 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
1060 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
1061
1062 return 0;
1063}
1064
James Morris88e9d342009-09-22 16:43:43 -07001065static const struct seq_operations netlbladdr_seq_ops = {
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001066 .start = netlbladdr_seq_start,
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001067 .next = netlbladdr_seq_next,
1068 .show = netlbladdr_seq_show,
Casey Schaufler40809562011-11-10 15:02:22 -08001069 .stop = smk_seq_stop,
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001070};
1071
1072/**
1073 * smk_open_netlbladdr - open() for /smack/netlabel
1074 * @inode: inode structure representing file
1075 * @file: "netlabel" file pointer
1076 *
1077 * Connect our netlbladdr_seq_* operations with /smack/netlabel
1078 * file_operations
1079 */
1080static int smk_open_netlbladdr(struct inode *inode, struct file *file)
1081{
1082 return seq_open(file, &netlbladdr_seq_ops);
1083}
1084
1085/**
etienne113a0e42009-03-04 07:33:51 +01001086 * smk_netlbladdr_insert
1087 * @new : netlabel to insert
1088 *
1089 * This helper insert netlabel in the smack_netlbladdrs list
1090 * sorted by netmask length (longest to smallest)
Etienne Basset7198e2e2009-03-24 20:53:24 +01001091 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
1092 *
etienne113a0e42009-03-04 07:33:51 +01001093 */
1094static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
1095{
Etienne Basset7198e2e2009-03-24 20:53:24 +01001096 struct smk_netlbladdr *m, *m_next;
etienne113a0e42009-03-04 07:33:51 +01001097
Etienne Basset7198e2e2009-03-24 20:53:24 +01001098 if (list_empty(&smk_netlbladdr_list)) {
1099 list_add_rcu(&new->list, &smk_netlbladdr_list);
etienne113a0e42009-03-04 07:33:51 +01001100 return;
1101 }
1102
Jiri Pirko05725f72009-04-14 20:17:16 +02001103 m = list_entry_rcu(smk_netlbladdr_list.next,
1104 struct smk_netlbladdr, list);
Etienne Basset7198e2e2009-03-24 20:53:24 +01001105
etienne113a0e42009-03-04 07:33:51 +01001106 /* the comparison '>' is a bit hacky, but works */
Etienne Basset7198e2e2009-03-24 20:53:24 +01001107 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
1108 list_add_rcu(&new->list, &smk_netlbladdr_list);
etienne113a0e42009-03-04 07:33:51 +01001109 return;
1110 }
Etienne Basset7198e2e2009-03-24 20:53:24 +01001111
1112 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
1113 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
1114 list_add_rcu(&new->list, &m->list);
etienne113a0e42009-03-04 07:33:51 +01001115 return;
1116 }
Jiri Pirko05725f72009-04-14 20:17:16 +02001117 m_next = list_entry_rcu(m->list.next,
1118 struct smk_netlbladdr, list);
Etienne Basset7198e2e2009-03-24 20:53:24 +01001119 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
1120 list_add_rcu(&new->list, &m->list);
etienne113a0e42009-03-04 07:33:51 +01001121 return;
1122 }
1123 }
1124}
1125
1126
1127/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001128 * smk_write_netlbladdr - write() for /smack/netlabel
Randy Dunlap251a2a92009-02-18 11:42:33 -08001129 * @file: file pointer, not actually used
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001130 * @buf: where to get the data from
1131 * @count: bytes sent
1132 * @ppos: where to start
1133 *
1134 * Accepts only one netlbladdr per write call.
1135 * Returns number of bytes written or error code, as appropriate
1136 */
1137static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
1138 size_t count, loff_t *ppos)
1139{
1140 struct smk_netlbladdr *skp;
1141 struct sockaddr_in newname;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001142 char *smack;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001143 char *sp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001144 char *data;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001145 char *host = (char *)&newname.sin_addr.s_addr;
1146 int rc;
1147 struct netlbl_audit audit_info;
1148 struct in_addr mask;
1149 unsigned int m;
Etienne Basset7198e2e2009-03-24 20:53:24 +01001150 int found;
etienne113a0e42009-03-04 07:33:51 +01001151 u32 mask_bits = (1<<31);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001152 __be32 nsa;
etienne113a0e42009-03-04 07:33:51 +01001153 u32 temp_mask;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001154
1155 /*
1156 * Must have privilege.
1157 * No partial writes.
1158 * Enough data must be present.
1159 * "<addr/mask, as a.b.c.d/e><space><label>"
1160 * "<addr, as a.b.c.d><space><label>"
1161 */
Casey Schaufler1880eff2012-06-05 15:28:30 -07001162 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001163 return -EPERM;
1164 if (*ppos != 0)
1165 return -EINVAL;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001166 if (count < SMK_NETLBLADDRMIN)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001167 return -EINVAL;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001168
1169 data = kzalloc(count + 1, GFP_KERNEL);
1170 if (data == NULL)
1171 return -ENOMEM;
1172
1173 if (copy_from_user(data, buf, count) != 0) {
1174 rc = -EFAULT;
1175 goto free_data_out;
1176 }
1177
1178 smack = kzalloc(count + 1, GFP_KERNEL);
1179 if (smack == NULL) {
1180 rc = -ENOMEM;
1181 goto free_data_out;
1182 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001183
1184 data[count] = '\0';
1185
1186 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
1187 &host[0], &host[1], &host[2], &host[3], &m, smack);
1188 if (rc != 6) {
1189 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1190 &host[0], &host[1], &host[2], &host[3], smack);
Casey Schauflerf7112e62012-05-06 15:22:02 -07001191 if (rc != 5) {
1192 rc = -EINVAL;
1193 goto free_out;
1194 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001195 m = BEBITS;
1196 }
Casey Schauflerf7112e62012-05-06 15:22:02 -07001197 if (m > BEBITS) {
1198 rc = -EINVAL;
1199 goto free_out;
1200 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001201
Casey Schauflerf7112e62012-05-06 15:22:02 -07001202 /*
1203 * If smack begins with '-', it is an option, don't import it
1204 */
Etienne Basset43031542009-03-27 17:11:01 -04001205 if (smack[0] != '-') {
1206 sp = smk_import(smack, 0);
Casey Schauflerf7112e62012-05-06 15:22:02 -07001207 if (sp == NULL) {
1208 rc = -EINVAL;
1209 goto free_out;
1210 }
Etienne Basset43031542009-03-27 17:11:01 -04001211 } else {
1212 /* check known options */
1213 if (strcmp(smack, smack_cipso_option) == 0)
1214 sp = (char *)smack_cipso_option;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001215 else {
1216 rc = -EINVAL;
1217 goto free_out;
1218 }
Etienne Basset43031542009-03-27 17:11:01 -04001219 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001220
etienne113a0e42009-03-04 07:33:51 +01001221 for (temp_mask = 0; m > 0; m--) {
1222 temp_mask |= mask_bits;
1223 mask_bits >>= 1;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001224 }
etienne113a0e42009-03-04 07:33:51 +01001225 mask.s_addr = cpu_to_be32(temp_mask);
1226
1227 newname.sin_addr.s_addr &= mask.s_addr;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001228 /*
1229 * Only allow one writer at a time. Writes should be
1230 * quite rare and small in any case.
1231 */
1232 mutex_lock(&smk_netlbladdr_lock);
1233
1234 nsa = newname.sin_addr.s_addr;
etienne113a0e42009-03-04 07:33:51 +01001235 /* try to find if the prefix is already in the list */
Etienne Basset7198e2e2009-03-24 20:53:24 +01001236 found = 0;
1237 list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001238 if (skp->smk_host.sin_addr.s_addr == nsa &&
Etienne Basset7198e2e2009-03-24 20:53:24 +01001239 skp->smk_mask.s_addr == mask.s_addr) {
1240 found = 1;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001241 break;
Etienne Basset7198e2e2009-03-24 20:53:24 +01001242 }
1243 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001244 smk_netlabel_audit_set(&audit_info);
1245
Etienne Basset7198e2e2009-03-24 20:53:24 +01001246 if (found == 0) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001247 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
1248 if (skp == NULL)
1249 rc = -ENOMEM;
1250 else {
1251 rc = 0;
1252 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
1253 skp->smk_mask.s_addr = mask.s_addr;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001254 skp->smk_label = sp;
etienne113a0e42009-03-04 07:33:51 +01001255 smk_netlbladdr_insert(skp);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001256 }
1257 } else {
Etienne Basset43031542009-03-27 17:11:01 -04001258 /* we delete the unlabeled entry, only if the previous label
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001259 * wasn't the special CIPSO option */
Etienne Basset43031542009-03-27 17:11:01 -04001260 if (skp->smk_label != smack_cipso_option)
1261 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1262 &skp->smk_host.sin_addr, &skp->smk_mask,
1263 PF_INET, &audit_info);
1264 else
1265 rc = 0;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001266 skp->smk_label = sp;
1267 }
1268
1269 /*
1270 * Now tell netlabel about the single label nature of
1271 * this host so that incoming packets get labeled.
Etienne Basset43031542009-03-27 17:11:01 -04001272 * but only if we didn't get the special CIPSO option
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001273 */
Etienne Basset43031542009-03-27 17:11:01 -04001274 if (rc == 0 && sp != smack_cipso_option)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001275 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1276 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
1277 smack_to_secid(skp->smk_label), &audit_info);
1278
1279 if (rc == 0)
1280 rc = count;
1281
1282 mutex_unlock(&smk_netlbladdr_lock);
1283
Casey Schauflerf7112e62012-05-06 15:22:02 -07001284free_out:
1285 kfree(smack);
1286free_data_out:
1287 kfree(data);
1288
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001289 return rc;
1290}
1291
1292static const struct file_operations smk_netlbladdr_ops = {
1293 .open = smk_open_netlbladdr,
1294 .read = seq_read,
1295 .llseek = seq_lseek,
1296 .write = smk_write_netlbladdr,
1297 .release = seq_release,
1298};
1299
Casey Schauflere114e472008-02-04 22:29:50 -08001300/**
1301 * smk_read_doi - read() for /smack/doi
1302 * @filp: file pointer, not actually used
1303 * @buf: where to put the result
1304 * @count: maximum to send along
1305 * @ppos: where to start
1306 *
1307 * Returns number of bytes read or error code, as appropriate
1308 */
1309static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1310 size_t count, loff_t *ppos)
1311{
1312 char temp[80];
1313 ssize_t rc;
1314
1315 if (*ppos != 0)
1316 return 0;
1317
1318 sprintf(temp, "%d", smk_cipso_doi_value);
1319 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1320
1321 return rc;
1322}
1323
1324/**
1325 * smk_write_doi - write() for /smack/doi
Randy Dunlap251a2a92009-02-18 11:42:33 -08001326 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -08001327 * @buf: where to get the data from
1328 * @count: bytes sent
1329 * @ppos: where to start
1330 *
1331 * Returns number of bytes written or error code, as appropriate
1332 */
1333static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1334 size_t count, loff_t *ppos)
1335{
1336 char temp[80];
1337 int i;
1338
Casey Schaufler1880eff2012-06-05 15:28:30 -07001339 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflere114e472008-02-04 22:29:50 -08001340 return -EPERM;
1341
1342 if (count >= sizeof(temp) || count == 0)
1343 return -EINVAL;
1344
1345 if (copy_from_user(temp, buf, count) != 0)
1346 return -EFAULT;
1347
1348 temp[count] = '\0';
1349
1350 if (sscanf(temp, "%d", &i) != 1)
1351 return -EINVAL;
1352
1353 smk_cipso_doi_value = i;
1354
1355 smk_cipso_doi();
1356
1357 return count;
1358}
1359
1360static const struct file_operations smk_doi_ops = {
1361 .read = smk_read_doi,
1362 .write = smk_write_doi,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001363 .llseek = default_llseek,
Casey Schauflere114e472008-02-04 22:29:50 -08001364};
1365
1366/**
1367 * smk_read_direct - read() for /smack/direct
1368 * @filp: file pointer, not actually used
1369 * @buf: where to put the result
1370 * @count: maximum to send along
1371 * @ppos: where to start
1372 *
1373 * Returns number of bytes read or error code, as appropriate
1374 */
1375static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1376 size_t count, loff_t *ppos)
1377{
1378 char temp[80];
1379 ssize_t rc;
1380
1381 if (*ppos != 0)
1382 return 0;
1383
1384 sprintf(temp, "%d", smack_cipso_direct);
1385 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1386
1387 return rc;
1388}
1389
1390/**
1391 * smk_write_direct - write() for /smack/direct
Randy Dunlap251a2a92009-02-18 11:42:33 -08001392 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -08001393 * @buf: where to get the data from
1394 * @count: bytes sent
1395 * @ppos: where to start
1396 *
1397 * Returns number of bytes written or error code, as appropriate
1398 */
1399static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1400 size_t count, loff_t *ppos)
1401{
Casey Schauflerf7112e62012-05-06 15:22:02 -07001402 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08001403 char temp[80];
1404 int i;
1405
Casey Schaufler1880eff2012-06-05 15:28:30 -07001406 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflere114e472008-02-04 22:29:50 -08001407 return -EPERM;
1408
1409 if (count >= sizeof(temp) || count == 0)
1410 return -EINVAL;
1411
1412 if (copy_from_user(temp, buf, count) != 0)
1413 return -EFAULT;
1414
1415 temp[count] = '\0';
1416
1417 if (sscanf(temp, "%d", &i) != 1)
1418 return -EINVAL;
1419
Casey Schauflerf7112e62012-05-06 15:22:02 -07001420 /*
1421 * Don't do anything if the value hasn't actually changed.
1422 * If it is changing reset the level on entries that were
1423 * set up to be direct when they were created.
1424 */
1425 if (smack_cipso_direct != i) {
1426 mutex_lock(&smack_known_lock);
1427 list_for_each_entry_rcu(skp, &smack_known_list, list)
1428 if (skp->smk_netlabel.attr.mls.lvl ==
1429 smack_cipso_direct)
1430 skp->smk_netlabel.attr.mls.lvl = i;
1431 smack_cipso_direct = i;
1432 mutex_unlock(&smack_known_lock);
1433 }
Casey Schauflere114e472008-02-04 22:29:50 -08001434
1435 return count;
1436}
1437
1438static const struct file_operations smk_direct_ops = {
1439 .read = smk_read_direct,
1440 .write = smk_write_direct,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001441 .llseek = default_llseek,
Casey Schauflere114e472008-02-04 22:29:50 -08001442};
1443
1444/**
Casey Schauflerf7112e62012-05-06 15:22:02 -07001445 * smk_read_mapped - read() for /smack/mapped
1446 * @filp: file pointer, not actually used
1447 * @buf: where to put the result
1448 * @count: maximum to send along
1449 * @ppos: where to start
1450 *
1451 * Returns number of bytes read or error code, as appropriate
1452 */
1453static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1454 size_t count, loff_t *ppos)
1455{
1456 char temp[80];
1457 ssize_t rc;
1458
1459 if (*ppos != 0)
1460 return 0;
1461
1462 sprintf(temp, "%d", smack_cipso_mapped);
1463 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1464
1465 return rc;
1466}
1467
1468/**
1469 * smk_write_mapped - write() for /smack/mapped
1470 * @file: file pointer, not actually used
1471 * @buf: where to get the data from
1472 * @count: bytes sent
1473 * @ppos: where to start
1474 *
1475 * Returns number of bytes written or error code, as appropriate
1476 */
1477static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1478 size_t count, loff_t *ppos)
1479{
1480 struct smack_known *skp;
1481 char temp[80];
1482 int i;
1483
Casey Schaufler1880eff2012-06-05 15:28:30 -07001484 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflerf7112e62012-05-06 15:22:02 -07001485 return -EPERM;
1486
1487 if (count >= sizeof(temp) || count == 0)
1488 return -EINVAL;
1489
1490 if (copy_from_user(temp, buf, count) != 0)
1491 return -EFAULT;
1492
1493 temp[count] = '\0';
1494
1495 if (sscanf(temp, "%d", &i) != 1)
1496 return -EINVAL;
1497
1498 /*
1499 * Don't do anything if the value hasn't actually changed.
1500 * If it is changing reset the level on entries that were
1501 * set up to be mapped when they were created.
1502 */
1503 if (smack_cipso_mapped != i) {
1504 mutex_lock(&smack_known_lock);
1505 list_for_each_entry_rcu(skp, &smack_known_list, list)
1506 if (skp->smk_netlabel.attr.mls.lvl ==
1507 smack_cipso_mapped)
1508 skp->smk_netlabel.attr.mls.lvl = i;
1509 smack_cipso_mapped = i;
1510 mutex_unlock(&smack_known_lock);
1511 }
1512
1513 return count;
1514}
1515
1516static const struct file_operations smk_mapped_ops = {
1517 .read = smk_read_mapped,
1518 .write = smk_write_mapped,
1519 .llseek = default_llseek,
1520};
1521
1522/**
Casey Schauflere114e472008-02-04 22:29:50 -08001523 * smk_read_ambient - read() for /smack/ambient
1524 * @filp: file pointer, not actually used
1525 * @buf: where to put the result
1526 * @cn: maximum to send along
1527 * @ppos: where to start
1528 *
1529 * Returns number of bytes read or error code, as appropriate
1530 */
1531static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1532 size_t cn, loff_t *ppos)
1533{
1534 ssize_t rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001535 int asize;
1536
1537 if (*ppos != 0)
1538 return 0;
1539 /*
1540 * Being careful to avoid a problem in the case where
1541 * smack_net_ambient gets changed in midstream.
Casey Schauflere114e472008-02-04 22:29:50 -08001542 */
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001543 mutex_lock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -08001544
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001545 asize = strlen(smack_net_ambient->smk_known) + 1;
Casey Schauflere114e472008-02-04 22:29:50 -08001546
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001547 if (cn >= asize)
1548 rc = simple_read_from_buffer(buf, cn, ppos,
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001549 smack_net_ambient->smk_known,
1550 asize);
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001551 else
1552 rc = -EINVAL;
1553
1554 mutex_unlock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -08001555
1556 return rc;
1557}
1558
1559/**
1560 * smk_write_ambient - write() for /smack/ambient
Randy Dunlap251a2a92009-02-18 11:42:33 -08001561 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -08001562 * @buf: where to get the data from
1563 * @count: bytes sent
1564 * @ppos: where to start
1565 *
1566 * Returns number of bytes written or error code, as appropriate
1567 */
1568static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1569 size_t count, loff_t *ppos)
1570{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001571 struct smack_known *skp;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001572 char *oldambient;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001573 char *data;
1574 int rc = count;
Casey Schauflere114e472008-02-04 22:29:50 -08001575
Casey Schaufler1880eff2012-06-05 15:28:30 -07001576 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflere114e472008-02-04 22:29:50 -08001577 return -EPERM;
1578
Casey Schauflerf7112e62012-05-06 15:22:02 -07001579 data = kzalloc(count + 1, GFP_KERNEL);
1580 if (data == NULL)
1581 return -ENOMEM;
Casey Schauflere114e472008-02-04 22:29:50 -08001582
Casey Schauflerf7112e62012-05-06 15:22:02 -07001583 if (copy_from_user(data, buf, count) != 0) {
1584 rc = -EFAULT;
1585 goto out;
1586 }
Casey Schauflere114e472008-02-04 22:29:50 -08001587
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001588 skp = smk_import_entry(data, count);
1589 if (skp == NULL) {
Casey Schauflerf7112e62012-05-06 15:22:02 -07001590 rc = -EINVAL;
1591 goto out;
1592 }
Casey Schauflere114e472008-02-04 22:29:50 -08001593
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001594 mutex_lock(&smack_ambient_lock);
1595
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001596 oldambient = smack_net_ambient->smk_known;
1597 smack_net_ambient = skp;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001598 smk_unlbl_ambient(oldambient);
1599
1600 mutex_unlock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -08001601
Casey Schauflerf7112e62012-05-06 15:22:02 -07001602out:
1603 kfree(data);
1604 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001605}
1606
1607static const struct file_operations smk_ambient_ops = {
1608 .read = smk_read_ambient,
1609 .write = smk_write_ambient,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001610 .llseek = default_llseek,
Casey Schauflere114e472008-02-04 22:29:50 -08001611};
1612
Casey Schaufler15446232008-07-30 15:37:11 -07001613/**
Casey Schaufler00f84f32013-12-23 11:07:10 -08001614 * smk_read_onlycap - read() for smackfs/onlycap
Casey Schaufler15446232008-07-30 15:37:11 -07001615 * @filp: file pointer, not actually used
1616 * @buf: where to put the result
1617 * @cn: maximum to send along
1618 * @ppos: where to start
1619 *
1620 * Returns number of bytes read or error code, as appropriate
1621 */
1622static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1623 size_t cn, loff_t *ppos)
1624{
1625 char *smack = "";
1626 ssize_t rc = -EINVAL;
1627 int asize;
1628
1629 if (*ppos != 0)
1630 return 0;
1631
1632 if (smack_onlycap != NULL)
Casey Schaufler00f84f32013-12-23 11:07:10 -08001633 smack = smack_onlycap->smk_known;
Casey Schaufler15446232008-07-30 15:37:11 -07001634
1635 asize = strlen(smack) + 1;
1636
1637 if (cn >= asize)
1638 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1639
1640 return rc;
1641}
1642
1643/**
Casey Schaufler00f84f32013-12-23 11:07:10 -08001644 * smk_write_onlycap - write() for smackfs/onlycap
Randy Dunlap251a2a92009-02-18 11:42:33 -08001645 * @file: file pointer, not actually used
Casey Schaufler15446232008-07-30 15:37:11 -07001646 * @buf: where to get the data from
1647 * @count: bytes sent
1648 * @ppos: where to start
1649 *
1650 * Returns number of bytes written or error code, as appropriate
1651 */
1652static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1653 size_t count, loff_t *ppos)
1654{
Casey Schauflerf7112e62012-05-06 15:22:02 -07001655 char *data;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001656 struct smack_known *skp = smk_of_task(current->cred->security);
Casey Schauflerf7112e62012-05-06 15:22:02 -07001657 int rc = count;
Casey Schaufler15446232008-07-30 15:37:11 -07001658
Casey Schaufler1880eff2012-06-05 15:28:30 -07001659 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schaufler15446232008-07-30 15:37:11 -07001660 return -EPERM;
1661
1662 /*
1663 * This can be done using smk_access() but is done
1664 * explicitly for clarity. The smk_access() implementation
1665 * would use smk_access(smack_onlycap, MAY_WRITE)
1666 */
Casey Schaufler00f84f32013-12-23 11:07:10 -08001667 if (smack_onlycap != NULL && smack_onlycap != skp)
Casey Schaufler15446232008-07-30 15:37:11 -07001668 return -EPERM;
1669
Casey Schauflerf7112e62012-05-06 15:22:02 -07001670 data = kzalloc(count, GFP_KERNEL);
1671 if (data == NULL)
1672 return -ENOMEM;
Casey Schaufler15446232008-07-30 15:37:11 -07001673
1674 /*
1675 * Should the null string be passed in unset the onlycap value.
1676 * This seems like something to be careful with as usually
1677 * smk_import only expects to return NULL for errors. It
1678 * is usually the case that a nullstring or "\n" would be
1679 * bad to pass to smk_import but in fact this is useful here.
Casey Schauflerf7112e62012-05-06 15:22:02 -07001680 *
1681 * smk_import will also reject a label beginning with '-',
1682 * so "-usecapabilities" will also work.
Casey Schaufler15446232008-07-30 15:37:11 -07001683 */
Casey Schauflerf7112e62012-05-06 15:22:02 -07001684 if (copy_from_user(data, buf, count) != 0)
1685 rc = -EFAULT;
1686 else
Casey Schaufler00f84f32013-12-23 11:07:10 -08001687 smack_onlycap = smk_import_entry(data, count);
Casey Schaufler15446232008-07-30 15:37:11 -07001688
Casey Schauflerf7112e62012-05-06 15:22:02 -07001689 kfree(data);
1690 return rc;
Casey Schaufler15446232008-07-30 15:37:11 -07001691}
1692
1693static const struct file_operations smk_onlycap_ops = {
1694 .read = smk_read_onlycap,
1695 .write = smk_write_onlycap,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001696 .llseek = default_llseek,
Casey Schaufler15446232008-07-30 15:37:11 -07001697};
1698
Casey Schauflere114e472008-02-04 22:29:50 -08001699/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02001700 * smk_read_logging - read() for /smack/logging
1701 * @filp: file pointer, not actually used
1702 * @buf: where to put the result
1703 * @cn: maximum to send along
1704 * @ppos: where to start
1705 *
1706 * Returns number of bytes read or error code, as appropriate
1707 */
1708static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1709 size_t count, loff_t *ppos)
1710{
1711 char temp[32];
1712 ssize_t rc;
1713
1714 if (*ppos != 0)
1715 return 0;
1716
1717 sprintf(temp, "%d\n", log_policy);
1718 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1719 return rc;
1720}
1721
1722/**
1723 * smk_write_logging - write() for /smack/logging
1724 * @file: file pointer, not actually used
1725 * @buf: where to get the data from
1726 * @count: bytes sent
1727 * @ppos: where to start
1728 *
1729 * Returns number of bytes written or error code, as appropriate
1730 */
1731static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1732 size_t count, loff_t *ppos)
1733{
1734 char temp[32];
1735 int i;
1736
Casey Schaufler1880eff2012-06-05 15:28:30 -07001737 if (!smack_privileged(CAP_MAC_ADMIN))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001738 return -EPERM;
1739
1740 if (count >= sizeof(temp) || count == 0)
1741 return -EINVAL;
1742
1743 if (copy_from_user(temp, buf, count) != 0)
1744 return -EFAULT;
1745
1746 temp[count] = '\0';
1747
1748 if (sscanf(temp, "%d", &i) != 1)
1749 return -EINVAL;
1750 if (i < 0 || i > 3)
1751 return -EINVAL;
1752 log_policy = i;
1753 return count;
1754}
1755
1756
1757
1758static const struct file_operations smk_logging_ops = {
1759 .read = smk_read_logging,
1760 .write = smk_write_logging,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001761 .llseek = default_llseek,
Etienne Bassetecfcc532009-04-08 20:40:06 +02001762};
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001763
1764/*
1765 * Seq_file read operations for /smack/load-self
1766 */
1767
1768static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1769{
1770 struct task_smack *tsp = current_security();
1771
Casey Schaufler40809562011-11-10 15:02:22 -08001772 return smk_seq_start(s, pos, &tsp->smk_rules);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001773}
1774
1775static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1776{
1777 struct task_smack *tsp = current_security();
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001778
Casey Schaufler40809562011-11-10 15:02:22 -08001779 return smk_seq_next(s, v, pos, &tsp->smk_rules);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001780}
1781
1782static int load_self_seq_show(struct seq_file *s, void *v)
1783{
1784 struct list_head *list = v;
1785 struct smack_rule *srp =
1786 list_entry(list, struct smack_rule, list);
1787
Casey Schauflerf7112e62012-05-06 15:22:02 -07001788 smk_rule_show(s, srp, SMK_LABELLEN);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001789
1790 return 0;
1791}
1792
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001793static const struct seq_operations load_self_seq_ops = {
1794 .start = load_self_seq_start,
1795 .next = load_self_seq_next,
1796 .show = load_self_seq_show,
Casey Schaufler40809562011-11-10 15:02:22 -08001797 .stop = smk_seq_stop,
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001798};
1799
1800
1801/**
Casey Schauflerf7112e62012-05-06 15:22:02 -07001802 * smk_open_load_self - open() for /smack/load-self2
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001803 * @inode: inode structure representing file
1804 * @file: "load" file pointer
1805 *
1806 * For reading, use load_seq_* seq_file reading operations.
1807 */
1808static int smk_open_load_self(struct inode *inode, struct file *file)
1809{
1810 return seq_open(file, &load_self_seq_ops);
1811}
1812
1813/**
1814 * smk_write_load_self - write() for /smack/load-self
1815 * @file: file pointer, not actually used
1816 * @buf: where to get the data from
1817 * @count: bytes sent
1818 * @ppos: where to start - must be 0
1819 *
1820 */
1821static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1822 size_t count, loff_t *ppos)
1823{
1824 struct task_smack *tsp = current_security();
1825
Casey Schauflerf7112e62012-05-06 15:22:02 -07001826 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1827 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001828}
1829
1830static const struct file_operations smk_load_self_ops = {
1831 .open = smk_open_load_self,
1832 .read = seq_read,
1833 .llseek = seq_lseek,
1834 .write = smk_write_load_self,
1835 .release = seq_release,
1836};
Jarkko Sakkinen828716c2011-09-08 10:12:01 +03001837
1838/**
Casey Schauflerf7112e62012-05-06 15:22:02 -07001839 * smk_user_access - handle access check transaction
1840 * @file: file pointer
1841 * @buf: data from user space
1842 * @count: bytes sent
1843 * @ppos: where to start - must be 0
1844 */
1845static ssize_t smk_user_access(struct file *file, const char __user *buf,
1846 size_t count, loff_t *ppos, int format)
1847{
Rafal Krypae05b6f92013-01-10 19:42:00 +01001848 struct smack_parsed_rule rule;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001849 char *data;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001850 int res;
1851
1852 data = simple_transaction_get(file, buf, count);
1853 if (IS_ERR(data))
1854 return PTR_ERR(data);
1855
1856 if (format == SMK_FIXED24_FMT) {
1857 if (count < SMK_LOADLEN)
1858 return -EINVAL;
1859 res = smk_parse_rule(data, &rule, 0);
1860 } else {
1861 /*
Rafal Krypa10289b02013-08-09 11:47:07 +02001862 * simple_transaction_get() returns null-terminated data
Casey Schauflerf7112e62012-05-06 15:22:02 -07001863 */
Rafal Krypa10289b02013-08-09 11:47:07 +02001864 res = smk_parse_long_rule(data, &rule, 0, 3);
Casey Schauflerf7112e62012-05-06 15:22:02 -07001865 }
1866
Jarkko Sakkinen398ce072013-11-28 19:16:46 +02001867 if (res >= 0)
1868 res = smk_access(rule.smk_subject, rule.smk_object,
1869 rule.smk_access1, NULL);
1870 else if (res != -ENOENT)
Casey Schauflerf7112e62012-05-06 15:22:02 -07001871 return -EINVAL;
1872
Casey Schauflerf7112e62012-05-06 15:22:02 -07001873 data[0] = res == 0 ? '1' : '0';
1874 data[1] = '\0';
1875
1876 simple_transaction_set(file, 2);
1877
1878 if (format == SMK_FIXED24_FMT)
1879 return SMK_LOADLEN;
1880 return count;
1881}
1882
1883/**
Jarkko Sakkinen828716c2011-09-08 10:12:01 +03001884 * smk_write_access - handle access check transaction
1885 * @file: file pointer
1886 * @buf: data from user space
1887 * @count: bytes sent
1888 * @ppos: where to start - must be 0
1889 */
1890static ssize_t smk_write_access(struct file *file, const char __user *buf,
1891 size_t count, loff_t *ppos)
1892{
Casey Schauflerf7112e62012-05-06 15:22:02 -07001893 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
Jarkko Sakkinen828716c2011-09-08 10:12:01 +03001894}
1895
1896static const struct file_operations smk_access_ops = {
1897 .write = smk_write_access,
1898 .read = simple_transaction_read,
1899 .release = simple_transaction_release,
1900 .llseek = generic_file_llseek,
1901};
1902
Casey Schauflerf7112e62012-05-06 15:22:02 -07001903
1904/*
1905 * Seq_file read operations for /smack/load2
1906 */
1907
1908static int load2_seq_show(struct seq_file *s, void *v)
1909{
1910 struct list_head *list = v;
1911 struct smack_master_list *smlp =
1912 list_entry(list, struct smack_master_list, list);
1913
1914 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
1915
1916 return 0;
1917}
1918
1919static const struct seq_operations load2_seq_ops = {
1920 .start = load2_seq_start,
1921 .next = load2_seq_next,
1922 .show = load2_seq_show,
1923 .stop = smk_seq_stop,
1924};
1925
1926/**
1927 * smk_open_load2 - open() for /smack/load2
1928 * @inode: inode structure representing file
1929 * @file: "load2" file pointer
1930 *
1931 * For reading, use load2_seq_* seq_file reading operations.
1932 */
1933static int smk_open_load2(struct inode *inode, struct file *file)
1934{
1935 return seq_open(file, &load2_seq_ops);
1936}
1937
1938/**
1939 * smk_write_load2 - write() for /smack/load2
1940 * @file: file pointer, not actually used
1941 * @buf: where to get the data from
1942 * @count: bytes sent
1943 * @ppos: where to start - must be 0
1944 *
1945 */
1946static ssize_t smk_write_load2(struct file *file, const char __user *buf,
1947 size_t count, loff_t *ppos)
1948{
1949 /*
1950 * Must have privilege.
1951 */
Casey Schaufler1880eff2012-06-05 15:28:30 -07001952 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflerf7112e62012-05-06 15:22:02 -07001953 return -EPERM;
1954
1955 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
1956 SMK_LONG_FMT);
1957}
1958
1959static const struct file_operations smk_load2_ops = {
1960 .open = smk_open_load2,
1961 .read = seq_read,
1962 .llseek = seq_lseek,
1963 .write = smk_write_load2,
1964 .release = seq_release,
1965};
1966
1967/*
1968 * Seq_file read operations for /smack/load-self2
1969 */
1970
1971static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
1972{
1973 struct task_smack *tsp = current_security();
1974
1975 return smk_seq_start(s, pos, &tsp->smk_rules);
1976}
1977
1978static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
1979{
1980 struct task_smack *tsp = current_security();
1981
1982 return smk_seq_next(s, v, pos, &tsp->smk_rules);
1983}
1984
1985static int load_self2_seq_show(struct seq_file *s, void *v)
1986{
1987 struct list_head *list = v;
1988 struct smack_rule *srp =
1989 list_entry(list, struct smack_rule, list);
1990
1991 smk_rule_show(s, srp, SMK_LONGLABEL);
1992
1993 return 0;
1994}
1995
1996static const struct seq_operations load_self2_seq_ops = {
1997 .start = load_self2_seq_start,
1998 .next = load_self2_seq_next,
1999 .show = load_self2_seq_show,
2000 .stop = smk_seq_stop,
2001};
2002
2003/**
2004 * smk_open_load_self2 - open() for /smack/load-self2
2005 * @inode: inode structure representing file
2006 * @file: "load" file pointer
2007 *
2008 * For reading, use load_seq_* seq_file reading operations.
2009 */
2010static int smk_open_load_self2(struct inode *inode, struct file *file)
2011{
2012 return seq_open(file, &load_self2_seq_ops);
2013}
2014
2015/**
2016 * smk_write_load_self2 - write() for /smack/load-self2
2017 * @file: file pointer, not actually used
2018 * @buf: where to get the data from
2019 * @count: bytes sent
2020 * @ppos: where to start - must be 0
2021 *
2022 */
2023static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2024 size_t count, loff_t *ppos)
2025{
2026 struct task_smack *tsp = current_security();
2027
2028 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2029 &tsp->smk_rules_lock, SMK_LONG_FMT);
2030}
2031
2032static const struct file_operations smk_load_self2_ops = {
2033 .open = smk_open_load_self2,
2034 .read = seq_read,
2035 .llseek = seq_lseek,
2036 .write = smk_write_load_self2,
2037 .release = seq_release,
2038};
2039
2040/**
2041 * smk_write_access2 - handle access check transaction
2042 * @file: file pointer
2043 * @buf: data from user space
2044 * @count: bytes sent
2045 * @ppos: where to start - must be 0
2046 */
2047static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2048 size_t count, loff_t *ppos)
2049{
2050 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2051}
2052
2053static const struct file_operations smk_access2_ops = {
2054 .write = smk_write_access2,
2055 .read = simple_transaction_read,
2056 .release = simple_transaction_release,
2057 .llseek = generic_file_llseek,
2058};
2059
Etienne Bassetecfcc532009-04-08 20:40:06 +02002060/**
Rafal Krypa449543b2012-07-11 17:49:30 +02002061 * smk_write_revoke_subj - write() for /smack/revoke-subject
2062 * @file: file pointer
2063 * @buf: data from user space
2064 * @count: bytes sent
2065 * @ppos: where to start - must be 0
2066 */
2067static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2068 size_t count, loff_t *ppos)
2069{
2070 char *data = NULL;
2071 const char *cp = NULL;
2072 struct smack_known *skp;
2073 struct smack_rule *sp;
2074 struct list_head *rule_list;
2075 struct mutex *rule_lock;
2076 int rc = count;
2077
2078 if (*ppos != 0)
2079 return -EINVAL;
2080
2081 if (!smack_privileged(CAP_MAC_ADMIN))
2082 return -EPERM;
2083
2084 if (count == 0 || count > SMK_LONGLABEL)
2085 return -EINVAL;
2086
2087 data = kzalloc(count, GFP_KERNEL);
2088 if (data == NULL)
2089 return -ENOMEM;
2090
2091 if (copy_from_user(data, buf, count) != 0) {
2092 rc = -EFAULT;
2093 goto free_out;
2094 }
2095
2096 cp = smk_parse_smack(data, count);
2097 if (cp == NULL) {
2098 rc = -EINVAL;
2099 goto free_out;
2100 }
2101
2102 skp = smk_find_entry(cp);
Rafal Krypad15d9fad2012-11-27 16:28:11 +01002103 if (skp == NULL)
Rafal Krypa449543b2012-07-11 17:49:30 +02002104 goto free_out;
Rafal Krypa449543b2012-07-11 17:49:30 +02002105
2106 rule_list = &skp->smk_rules;
2107 rule_lock = &skp->smk_rules_lock;
2108
2109 mutex_lock(rule_lock);
2110
2111 list_for_each_entry_rcu(sp, rule_list, list)
2112 sp->smk_access = 0;
2113
2114 mutex_unlock(rule_lock);
2115
2116free_out:
2117 kfree(data);
2118 kfree(cp);
2119 return rc;
2120}
2121
2122static const struct file_operations smk_revoke_subj_ops = {
2123 .write = smk_write_revoke_subj,
2124 .read = simple_transaction_read,
2125 .release = simple_transaction_release,
2126 .llseek = generic_file_llseek,
2127};
2128
Casey Schauflere9307232012-11-01 18:14:32 -07002129static struct kset *smackfs_kset;
2130/**
2131 * smk_init_sysfs - initialize /sys/fs/smackfs
2132 *
2133 */
2134static int smk_init_sysfs(void)
2135{
2136 smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj);
2137 if (!smackfs_kset)
2138 return -ENOMEM;
2139 return 0;
2140}
2141
Rafal Krypa449543b2012-07-11 17:49:30 +02002142/**
Rafal Krypae05b6f92013-01-10 19:42:00 +01002143 * smk_write_change_rule - write() for /smack/change-rule
2144 * @file: file pointer
2145 * @buf: data from user space
2146 * @count: bytes sent
2147 * @ppos: where to start - must be 0
2148 */
2149static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2150 size_t count, loff_t *ppos)
2151{
2152 /*
2153 * Must have privilege.
2154 */
Casey Schaufler4afde482013-12-19 13:23:26 -08002155 if (!smack_privileged(CAP_MAC_ADMIN))
Rafal Krypae05b6f92013-01-10 19:42:00 +01002156 return -EPERM;
2157
2158 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2159 SMK_CHANGE_FMT);
2160}
2161
2162static const struct file_operations smk_change_rule_ops = {
2163 .write = smk_write_change_rule,
2164 .read = simple_transaction_read,
2165 .release = simple_transaction_release,
2166 .llseek = generic_file_llseek,
2167};
2168
2169/**
Casey Schaufler00f84f32013-12-23 11:07:10 -08002170 * smk_read_syslog - read() for smackfs/syslog
2171 * @filp: file pointer, not actually used
2172 * @buf: where to put the result
2173 * @cn: maximum to send along
2174 * @ppos: where to start
2175 *
2176 * Returns number of bytes read or error code, as appropriate
2177 */
2178static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2179 size_t cn, loff_t *ppos)
2180{
2181 struct smack_known *skp;
2182 ssize_t rc = -EINVAL;
2183 int asize;
2184
2185 if (*ppos != 0)
2186 return 0;
2187
2188 if (smack_syslog_label == NULL)
2189 skp = &smack_known_star;
2190 else
2191 skp = smack_syslog_label;
2192
2193 asize = strlen(skp->smk_known) + 1;
2194
2195 if (cn >= asize)
2196 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2197 asize);
2198
2199 return rc;
2200}
2201
2202/**
2203 * smk_write_syslog - write() for smackfs/syslog
2204 * @file: file pointer, not actually used
2205 * @buf: where to get the data from
2206 * @count: bytes sent
2207 * @ppos: where to start
2208 *
2209 * Returns number of bytes written or error code, as appropriate
2210 */
2211static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2212 size_t count, loff_t *ppos)
2213{
2214 char *data;
2215 struct smack_known *skp;
2216 int rc = count;
2217
2218 if (!smack_privileged(CAP_MAC_ADMIN))
2219 return -EPERM;
2220
2221 data = kzalloc(count, GFP_KERNEL);
2222 if (data == NULL)
2223 return -ENOMEM;
2224
2225 if (copy_from_user(data, buf, count) != 0)
2226 rc = -EFAULT;
2227 else {
2228 skp = smk_import_entry(data, count);
2229 if (skp == NULL)
2230 rc = -EINVAL;
2231 else
2232 smack_syslog_label = smk_import_entry(data, count);
2233 }
2234
2235 kfree(data);
2236 return rc;
2237}
2238
2239static const struct file_operations smk_syslog_ops = {
2240 .read = smk_read_syslog,
2241 .write = smk_write_syslog,
2242 .llseek = default_llseek,
2243};
2244
2245
2246/**
2247 * smk_fill_super - fill the smackfs superblock
Casey Schauflere114e472008-02-04 22:29:50 -08002248 * @sb: the empty superblock
2249 * @data: unused
2250 * @silent: unused
2251 *
Casey Schaufler00f84f32013-12-23 11:07:10 -08002252 * Fill in the well known entries for the smack filesystem
Casey Schauflere114e472008-02-04 22:29:50 -08002253 *
2254 * Returns 0 on success, an error code on failure
2255 */
2256static int smk_fill_super(struct super_block *sb, void *data, int silent)
2257{
2258 int rc;
2259 struct inode *root_inode;
2260
2261 static struct tree_descr smack_files[] = {
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002262 [SMK_LOAD] = {
2263 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2264 [SMK_CIPSO] = {
2265 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2266 [SMK_DOI] = {
2267 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2268 [SMK_DIRECT] = {
2269 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2270 [SMK_AMBIENT] = {
2271 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2272 [SMK_NETLBLADDR] = {
2273 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
2274 [SMK_ONLYCAP] = {
2275 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2276 [SMK_LOGGING] = {
2277 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2278 [SMK_LOAD_SELF] = {
2279 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
Jarkko Sakkinen828716c2011-09-08 10:12:01 +03002280 [SMK_ACCESSES] = {
Jarkko Sakkinen0e94ae12011-10-18 21:21:36 +03002281 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
Casey Schauflerf7112e62012-05-06 15:22:02 -07002282 [SMK_MAPPED] = {
2283 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2284 [SMK_LOAD2] = {
2285 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2286 [SMK_LOAD_SELF2] = {
2287 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2288 [SMK_ACCESS2] = {
2289 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2290 [SMK_CIPSO2] = {
2291 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
Rafal Krypa449543b2012-07-11 17:49:30 +02002292 [SMK_REVOKE_SUBJ] = {
2293 "revoke-subject", &smk_revoke_subj_ops,
2294 S_IRUGO|S_IWUSR},
Rafal Krypae05b6f92013-01-10 19:42:00 +01002295 [SMK_CHANGE_RULE] = {
2296 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
Casey Schaufler00f84f32013-12-23 11:07:10 -08002297 [SMK_SYSLOG] = {
2298 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002299 /* last one */
2300 {""}
Casey Schauflere114e472008-02-04 22:29:50 -08002301 };
2302
2303 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2304 if (rc != 0) {
2305 printk(KERN_ERR "%s failed %d while creating inodes\n",
2306 __func__, rc);
2307 return rc;
2308 }
2309
2310 root_inode = sb->s_root->d_inode;
Casey Schauflere114e472008-02-04 22:29:50 -08002311
2312 return 0;
2313}
2314
2315/**
Al Virofc14f2f2010-07-25 01:48:30 +04002316 * smk_mount - get the smackfs superblock
Casey Schauflere114e472008-02-04 22:29:50 -08002317 * @fs_type: passed along without comment
2318 * @flags: passed along without comment
2319 * @dev_name: passed along without comment
2320 * @data: passed along without comment
Casey Schauflere114e472008-02-04 22:29:50 -08002321 *
2322 * Just passes everything along.
2323 *
2324 * Returns what the lower level code does.
2325 */
Al Virofc14f2f2010-07-25 01:48:30 +04002326static struct dentry *smk_mount(struct file_system_type *fs_type,
2327 int flags, const char *dev_name, void *data)
Casey Schauflere114e472008-02-04 22:29:50 -08002328{
Al Virofc14f2f2010-07-25 01:48:30 +04002329 return mount_single(fs_type, flags, data, smk_fill_super);
Casey Schauflere114e472008-02-04 22:29:50 -08002330}
2331
2332static struct file_system_type smk_fs_type = {
2333 .name = "smackfs",
Al Virofc14f2f2010-07-25 01:48:30 +04002334 .mount = smk_mount,
Casey Schauflere114e472008-02-04 22:29:50 -08002335 .kill_sb = kill_litter_super,
2336};
2337
2338static struct vfsmount *smackfs_mount;
2339
Casey Schauflerf7112e62012-05-06 15:22:02 -07002340static int __init smk_preset_netlabel(struct smack_known *skp)
2341{
2342 skp->smk_netlabel.domain = skp->smk_known;
2343 skp->smk_netlabel.flags =
2344 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2345 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2346 &skp->smk_netlabel, strlen(skp->smk_known));
2347}
2348
Casey Schauflere114e472008-02-04 22:29:50 -08002349/**
2350 * init_smk_fs - get the smackfs superblock
2351 *
2352 * register the smackfs
2353 *
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02002354 * Do not register smackfs if Smack wasn't enabled
2355 * on boot. We can not put this method normally under the
2356 * smack_init() code path since the security subsystem get
2357 * initialized before the vfs caches.
2358 *
2359 * Returns true if we were not chosen on boot or if
2360 * we were chosen and filesystem registration succeeded.
Casey Schauflere114e472008-02-04 22:29:50 -08002361 */
2362static int __init init_smk_fs(void)
2363{
2364 int err;
Casey Schauflerf7112e62012-05-06 15:22:02 -07002365 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002366
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02002367 if (!security_module_enable(&smack_ops))
2368 return 0;
2369
Casey Schauflere9307232012-11-01 18:14:32 -07002370 err = smk_init_sysfs();
2371 if (err)
2372 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2373
Casey Schauflere114e472008-02-04 22:29:50 -08002374 err = register_filesystem(&smk_fs_type);
2375 if (!err) {
2376 smackfs_mount = kern_mount(&smk_fs_type);
2377 if (IS_ERR(smackfs_mount)) {
2378 printk(KERN_ERR "smackfs: could not mount!\n");
2379 err = PTR_ERR(smackfs_mount);
2380 smackfs_mount = NULL;
2381 }
2382 }
2383
Casey Schauflere114e472008-02-04 22:29:50 -08002384 smk_cipso_doi();
Casey Schaufler4bc87e62008-02-15 15:24:25 -08002385 smk_unlbl_ambient(NULL);
Casey Schauflere114e472008-02-04 22:29:50 -08002386
Casey Schauflerf7112e62012-05-06 15:22:02 -07002387 rc = smk_preset_netlabel(&smack_known_floor);
2388 if (err == 0 && rc < 0)
2389 err = rc;
2390 rc = smk_preset_netlabel(&smack_known_hat);
2391 if (err == 0 && rc < 0)
2392 err = rc;
2393 rc = smk_preset_netlabel(&smack_known_huh);
2394 if (err == 0 && rc < 0)
2395 err = rc;
2396 rc = smk_preset_netlabel(&smack_known_invalid);
2397 if (err == 0 && rc < 0)
2398 err = rc;
2399 rc = smk_preset_netlabel(&smack_known_star);
2400 if (err == 0 && rc < 0)
2401 err = rc;
2402 rc = smk_preset_netlabel(&smack_known_web);
2403 if (err == 0 && rc < 0)
2404 err = rc;
2405
Casey Schauflere114e472008-02-04 22:29:50 -08002406 return err;
2407}
2408
2409__initcall(init_smk_fs);