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-rw-r--r--security/Kconfig1
-rw-r--r--security/Makefile2
-rw-r--r--security/smack/Kconfig10
-rw-r--r--security/smack/Makefile7
-rw-r--r--security/smack/smack.h220
-rw-r--r--security/smack/smack_access.c356
-rw-r--r--security/smack/smack_lsm.c2518
-rw-r--r--security/smack/smackfs.c981
8 files changed, 4095 insertions, 0 deletions
diff --git a/security/Kconfig b/security/Kconfig
index 389e151e3b68..25ffe1b9dc98 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -105,6 +105,7 @@ config SECURITY_ROOTPLUG
105 If you are unsure how to answer this question, answer N. 105 If you are unsure how to answer this question, answer N.
106 106
107source security/selinux/Kconfig 107source security/selinux/Kconfig
108source security/smack/Kconfig
108 109
109endmenu 110endmenu
110 111
diff --git a/security/Makefile b/security/Makefile
index ef87df2f50a4..9e8b02525014 100644
--- a/security/Makefile
+++ b/security/Makefile
@@ -4,6 +4,7 @@
4 4
5obj-$(CONFIG_KEYS) += keys/ 5obj-$(CONFIG_KEYS) += keys/
6subdir-$(CONFIG_SECURITY_SELINUX) += selinux 6subdir-$(CONFIG_SECURITY_SELINUX) += selinux
7subdir-$(CONFIG_SECURITY_SMACK) += smack
7 8
8# if we don't select a security model, use the default capabilities 9# if we don't select a security model, use the default capabilities
9ifneq ($(CONFIG_SECURITY),y) 10ifneq ($(CONFIG_SECURITY),y)
@@ -14,5 +15,6 @@ endif
14obj-$(CONFIG_SECURITY) += security.o dummy.o inode.o 15obj-$(CONFIG_SECURITY) += security.o dummy.o inode.o
15# Must precede capability.o in order to stack properly. 16# Must precede capability.o in order to stack properly.
16obj-$(CONFIG_SECURITY_SELINUX) += selinux/built-in.o 17obj-$(CONFIG_SECURITY_SELINUX) += selinux/built-in.o
18obj-$(CONFIG_SECURITY_SMACK) += commoncap.o smack/built-in.o
17obj-$(CONFIG_SECURITY_CAPABILITIES) += commoncap.o capability.o 19obj-$(CONFIG_SECURITY_CAPABILITIES) += commoncap.o capability.o
18obj-$(CONFIG_SECURITY_ROOTPLUG) += commoncap.o root_plug.o 20obj-$(CONFIG_SECURITY_ROOTPLUG) += commoncap.o root_plug.o
diff --git a/security/smack/Kconfig b/security/smack/Kconfig
new file mode 100644
index 000000000000..603b08784341
--- /dev/null
+++ b/security/smack/Kconfig
@@ -0,0 +1,10 @@
1config SECURITY_SMACK
2 bool "Simplified Mandatory Access Control Kernel Support"
3 depends on NETLABEL && SECURITY_NETWORK
4 default n
5 help
6 This selects the Simplified Mandatory Access Control Kernel.
7 Smack is useful for sensitivity, integrity, and a variety
8 of other mandatory security schemes.
9 If you are unsure how to answer this question, answer N.
10
diff --git a/security/smack/Makefile b/security/smack/Makefile
new file mode 100644
index 000000000000..67a63aaec827
--- /dev/null
+++ b/security/smack/Makefile
@@ -0,0 +1,7 @@
1#
2# Makefile for the SMACK LSM
3#
4
5obj-$(CONFIG_SECURITY_SMACK) := smack.o
6
7smack-y := smack_lsm.o smack_access.o smackfs.o
diff --git a/security/smack/smack.h b/security/smack/smack.h
new file mode 100644
index 000000000000..a21a0e907ab3
--- /dev/null
+++ b/security/smack/smack.h
@@ -0,0 +1,220 @@
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Author:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 *
11 */
12
13#ifndef _SECURITY_SMACK_H
14#define _SECURITY_SMACK_H
15
16#include <linux/capability.h>
17#include <linux/spinlock.h>
18#include <net/netlabel.h>
19
20/*
21 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
22 * bigger than can be used, and 24 is the next lower multiple
23 * of 8, and there are too many issues if there isn't space set
24 * aside for the terminating null byte.
25 */
26#define SMK_MAXLEN 23
27#define SMK_LABELLEN (SMK_MAXLEN+1)
28
29/*
30 * How many kinds of access are there?
31 * Here's your answer.
32 */
33#define SMK_ACCESSDASH '-'
34#define SMK_ACCESSLOW "rwxa"
35#define SMK_ACCESSKINDS (sizeof(SMK_ACCESSLOW) - 1)
36
37struct superblock_smack {
38 char *smk_root;
39 char *smk_floor;
40 char *smk_hat;
41 char *smk_default;
42 int smk_initialized;
43 spinlock_t smk_sblock; /* for initialization */
44};
45
46struct socket_smack {
47 char *smk_out; /* outbound label */
48 char *smk_in; /* inbound label */
49 char smk_packet[SMK_LABELLEN]; /* TCP peer label */
50};
51
52/*
53 * Inode smack data
54 */
55struct inode_smack {
56 char *smk_inode; /* label of the fso */
57 struct mutex smk_lock; /* initialization lock */
58 int smk_flags; /* smack inode flags */
59};
60
61#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
62
63/*
64 * A label access rule.
65 */
66struct smack_rule {
67 char *smk_subject;
68 char *smk_object;
69 int smk_access;
70};
71
72/*
73 * An entry in the table of permitted label accesses.
74 */
75struct smk_list_entry {
76 struct smk_list_entry *smk_next;
77 struct smack_rule smk_rule;
78};
79
80/*
81 * An entry in the table mapping smack values to
82 * CIPSO level/category-set values.
83 */
84struct smack_cipso {
85 int smk_level;
86 char smk_catset[SMK_LABELLEN];
87};
88
89/*
90 * This is the repository for labels seen so that it is
91 * not necessary to keep allocating tiny chuncks of memory
92 * and so that they can be shared.
93 *
94 * Labels are never modified in place. Anytime a label
95 * is imported (e.g. xattrset on a file) the list is checked
96 * for it and it is added if it doesn't exist. The address
97 * is passed out in either case. Entries are added, but
98 * never deleted.
99 *
100 * Since labels are hanging around anyway it doesn't
101 * hurt to maintain a secid for those awkward situations
102 * where kernel components that ought to use LSM independent
103 * interfaces don't. The secid should go away when all of
104 * these components have been repaired.
105 *
106 * If there is a cipso value associated with the label it
107 * gets stored here, too. This will most likely be rare as
108 * the cipso direct mapping in used internally.
109 */
110struct smack_known {
111 struct smack_known *smk_next;
112 char smk_known[SMK_LABELLEN];
113 u32 smk_secid;
114 struct smack_cipso *smk_cipso;
115 spinlock_t smk_cipsolock; /* for changing cipso map */
116};
117
118/*
119 * Mount options
120 */
121#define SMK_FSDEFAULT "smackfsdef="
122#define SMK_FSFLOOR "smackfsfloor="
123#define SMK_FSHAT "smackfshat="
124#define SMK_FSROOT "smackfsroot="
125
126/*
127 * xattr names
128 */
129#define XATTR_SMACK_SUFFIX "SMACK64"
130#define XATTR_SMACK_IPIN "SMACK64IPIN"
131#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
132#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
133#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
134#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
135
136/*
137 * smackfs macic number
138 */
139#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
140
141/*
142 * A limit on the number of entries in the lists
143 * makes some of the list administration easier.
144 */
145#define SMACK_LIST_MAX 10000
146
147/*
148 * CIPSO defaults.
149 */
150#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
151#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
152#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
153#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
154#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
155
156/*
157 * Just to make the common cases easier to deal with
158 */
159#define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
160#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
161#define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND)
162#define MAY_READWRITE (MAY_READ | MAY_WRITE)
163#define MAY_NOT 0
164
165/*
166 * These functions are in smack_lsm.c
167 */
168struct inode_smack *new_inode_smack(char *);
169
170/*
171 * These functions are in smack_access.c
172 */
173int smk_access(char *, char *, int);
174int smk_curacc(char *, u32);
175int smack_to_cipso(const char *, struct smack_cipso *);
176void smack_from_cipso(u32, char *, char *);
177char *smack_from_secid(const u32);
178char *smk_import(const char *, int);
179struct smack_known *smk_import_entry(const char *, int);
180u32 smack_to_secid(const char *);
181
182/*
183 * Shared data.
184 */
185extern int smack_cipso_direct;
186extern int smack_net_nltype;
187extern char *smack_net_ambient;
188
189extern struct smack_known *smack_known;
190extern struct smack_known smack_known_floor;
191extern struct smack_known smack_known_hat;
192extern struct smack_known smack_known_huh;
193extern struct smack_known smack_known_invalid;
194extern struct smack_known smack_known_star;
195extern struct smack_known smack_known_unset;
196
197extern struct smk_list_entry *smack_list;
198
199/*
200 * Stricly for CIPSO level manipulation.
201 * Set the category bit number in a smack label sized buffer.
202 */
203static inline void smack_catset_bit(int cat, char *catsetp)
204{
205 if (cat > SMK_LABELLEN * 8)
206 return;
207
208 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
209}
210
211/*
212 * Present a pointer to the smack label in an inode blob.
213 */
214static inline char *smk_of_inode(const struct inode *isp)
215{
216 struct inode_smack *sip = isp->i_security;
217 return sip->smk_inode;
218}
219
220#endif /* _SECURITY_SMACK_H */
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
new file mode 100644
index 000000000000..f6b5f6eed6dd
--- /dev/null
+++ b/security/smack/smack_access.c
@@ -0,0 +1,356 @@
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Author:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 *
11 */
12
13#include <linux/types.h>
14#include <linux/fs.h>
15#include <linux/sched.h>
16#include "smack.h"
17
18struct smack_known smack_known_unset = {
19 .smk_next = NULL,
20 .smk_known = "UNSET",
21 .smk_secid = 1,
22 .smk_cipso = NULL,
23};
24
25struct smack_known smack_known_huh = {
26 .smk_next = &smack_known_unset,
27 .smk_known = "?",
28 .smk_secid = 2,
29 .smk_cipso = NULL,
30};
31
32struct smack_known smack_known_hat = {
33 .smk_next = &smack_known_huh,
34 .smk_known = "^",
35 .smk_secid = 3,
36 .smk_cipso = NULL,
37};
38
39struct smack_known smack_known_star = {
40 .smk_next = &smack_known_hat,
41 .smk_known = "*",
42 .smk_secid = 4,
43 .smk_cipso = NULL,
44};
45
46struct smack_known smack_known_floor = {
47 .smk_next = &smack_known_star,
48 .smk_known = "_",
49 .smk_secid = 5,
50 .smk_cipso = NULL,
51};
52
53struct smack_known smack_known_invalid = {
54 .smk_next = &smack_known_floor,
55 .smk_known = "",
56 .smk_secid = 6,
57 .smk_cipso = NULL,
58};
59
60struct smack_known *smack_known = &smack_known_invalid;
61
62/*
63 * The initial value needs to be bigger than any of the
64 * known values above.
65 */
66static u32 smack_next_secid = 10;
67
68/**
69 * smk_access - determine if a subject has a specific access to an object
70 * @subject_label: a pointer to the subject's Smack label
71 * @object_label: a pointer to the object's Smack label
72 * @request: the access requested, in "MAY" format
73 *
74 * This function looks up the subject/object pair in the
75 * access rule list and returns 0 if the access is permitted,
76 * non zero otherwise.
77 *
78 * Even though Smack labels are usually shared on smack_list
79 * labels that come in off the network can't be imported
80 * and added to the list for locking reasons.
81 *
82 * Therefore, it is necessary to check the contents of the labels,
83 * not just the pointer values. Of course, in most cases the labels
84 * will be on the list, so checking the pointers may be a worthwhile
85 * optimization.
86 */
87int smk_access(char *subject_label, char *object_label, int request)
88{
89 u32 may = MAY_NOT;
90 struct smk_list_entry *sp;
91 struct smack_rule *srp;
92
93 /*
94 * Hardcoded comparisons.
95 *
96 * A star subject can't access any object.
97 */
98 if (subject_label == smack_known_star.smk_known ||
99 strcmp(subject_label, smack_known_star.smk_known) == 0)
100 return -EACCES;
101 /*
102 * A star object can be accessed by any subject.
103 */
104 if (object_label == smack_known_star.smk_known ||
105 strcmp(object_label, smack_known_star.smk_known) == 0)
106 return 0;
107 /*
108 * An object can be accessed in any way by a subject
109 * with the same label.
110 */
111 if (subject_label == object_label ||
112 strcmp(subject_label, object_label) == 0)
113 return 0;
114 /*
115 * A hat subject can read any object.
116 * A floor object can be read by any subject.
117 */
118 if ((request & MAY_ANYREAD) == request) {
119 if (object_label == smack_known_floor.smk_known ||
120 strcmp(object_label, smack_known_floor.smk_known) == 0)
121 return 0;
122 if (subject_label == smack_known_hat.smk_known ||
123 strcmp(subject_label, smack_known_hat.smk_known) == 0)
124 return 0;
125 }
126 /*
127 * Beyond here an explicit relationship is required.
128 * If the requested access is contained in the available
129 * access (e.g. read is included in readwrite) it's
130 * good.
131 */
132 for (sp = smack_list; sp != NULL; sp = sp->smk_next) {
133 srp = &sp->smk_rule;
134
135 if (srp->smk_subject == subject_label ||
136 strcmp(srp->smk_subject, subject_label) == 0) {
137 if (srp->smk_object == object_label ||
138 strcmp(srp->smk_object, object_label) == 0) {
139 may = srp->smk_access;
140 break;
141 }
142 }
143 }
144 /*
145 * This is a bit map operation.
146 */
147 if ((request & may) == request)
148 return 0;
149
150 return -EACCES;
151}
152
153/**
154 * smk_curacc - determine if current has a specific access to an object
155 * @object_label: a pointer to the object's Smack label
156 * @request: the access requested, in "MAY" format
157 *
158 * This function checks the current subject label/object label pair
159 * in the access rule list and returns 0 if the access is permitted,
160 * non zero otherwise. It allows that current my have the capability
161 * to override the rules.
162 */
163int smk_curacc(char *obj_label, u32 mode)
164{
165 int rc;
166
167 rc = smk_access(current->security, obj_label, mode);
168 if (rc == 0)
169 return 0;
170
171 if (capable(CAP_MAC_OVERRIDE))
172 return 0;
173
174 return rc;
175}
176
177static DEFINE_MUTEX(smack_known_lock);
178
179/**
180 * smk_import_entry - import a label, return the list entry
181 * @string: a text string that might be a Smack label
182 * @len: the maximum size, or zero if it is NULL terminated.
183 *
184 * Returns a pointer to the entry in the label list that
185 * matches the passed string, adding it if necessary.
186 */
187struct smack_known *smk_import_entry(const char *string, int len)
188{
189 struct smack_known *skp;
190 char smack[SMK_LABELLEN];
191 int found;
192 int i;
193
194 if (len <= 0 || len > SMK_MAXLEN)
195 len = SMK_MAXLEN;
196
197 for (i = 0, found = 0; i < SMK_LABELLEN; i++) {
198 if (found)
199 smack[i] = '\0';
200 else if (i >= len || string[i] > '~' || string[i] <= ' ' ||
201 string[i] == '/') {
202 smack[i] = '\0';
203 found = 1;
204 } else
205 smack[i] = string[i];
206 }
207
208 if (smack[0] == '\0')
209 return NULL;
210
211 mutex_lock(&smack_known_lock);
212
213 for (skp = smack_known; skp != NULL; skp = skp->smk_next)
214 if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0)
215 break;
216
217 if (skp == NULL) {
218 skp = kzalloc(sizeof(struct smack_known), GFP_KERNEL);
219 if (skp != NULL) {
220 skp->smk_next = smack_known;
221 strncpy(skp->smk_known, smack, SMK_MAXLEN);
222 skp->smk_secid = smack_next_secid++;
223 skp->smk_cipso = NULL;
224 spin_lock_init(&skp->smk_cipsolock);
225 /*
226 * Make sure that the entry is actually
227 * filled before putting it on the list.
228 */
229 smp_mb();
230 smack_known = skp;
231 }
232 }
233
234 mutex_unlock(&smack_known_lock);
235
236 return skp;
237}
238
239/**
240 * smk_import - import a smack label
241 * @string: a text string that might be a Smack label
242 * @len: the maximum size, or zero if it is NULL terminated.
243 *
244 * Returns a pointer to the label in the label list that
245 * matches the passed string, adding it if necessary.
246 */
247char *smk_import(const char *string, int len)
248{
249 struct smack_known *skp;
250
251 skp = smk_import_entry(string, len);
252 if (skp == NULL)
253 return NULL;
254 return skp->smk_known;
255}
256
257/**
258 * smack_from_secid - find the Smack label associated with a secid
259 * @secid: an integer that might be associated with a Smack label
260 *
261 * Returns a pointer to the appropraite Smack label if there is one,
262 * otherwise a pointer to the invalid Smack label.
263 */
264char *smack_from_secid(const u32 secid)
265{
266 struct smack_known *skp;
267
268 for (skp = smack_known; skp != NULL; skp = skp->smk_next)
269 if (skp->smk_secid == secid)
270 return skp->smk_known;
271
272 /*
273 * If we got this far someone asked for the translation
274 * of a secid that is not on the list.
275 */
276 return smack_known_invalid.smk_known;
277}
278
279/**
280 * smack_to_secid - find the secid associated with a Smack label
281 * @smack: the Smack label
282 *
283 * Returns the appropriate secid if there is one,
284 * otherwise 0
285 */
286u32 smack_to_secid(const char *smack)
287{
288 struct smack_known *skp;
289
290 for (skp = smack_known; skp != NULL; skp = skp->smk_next)
291 if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0)
292 return skp->smk_secid;
293 return 0;
294}
295
296/**
297 * smack_from_cipso - find the Smack label associated with a CIPSO option
298 * @level: Bell & LaPadula level from the network
299 * @cp: Bell & LaPadula categories from the network
300 * @result: where to put the Smack value
301 *
302 * This is a simple lookup in the label table.
303 *
304 * This is an odd duck as far as smack handling goes in that
305 * it sends back a copy of the smack label rather than a pointer
306 * to the master list. This is done because it is possible for
307 * a foreign host to send a smack label that is new to this
308 * machine and hence not on the list. That would not be an
309 * issue except that adding an entry to the master list can't
310 * be done at that point.
311 */
312void smack_from_cipso(u32 level, char *cp, char *result)
313{
314 struct smack_known *kp;
315 char *final = NULL;
316
317 for (kp = smack_known; final == NULL && kp != NULL; kp = kp->smk_next) {
318 if (kp->smk_cipso == NULL)
319 continue;
320
321 spin_lock_bh(&kp->smk_cipsolock);
322
323 if (kp->smk_cipso->smk_level == level &&
324 memcmp(kp->smk_cipso->smk_catset, cp, SMK_LABELLEN) == 0)
325 final = kp->smk_known;
326
327 spin_unlock_bh(&kp->smk_cipsolock);
328 }
329 if (final == NULL)
330 final = smack_known_huh.smk_known;
331 strncpy(result, final, SMK_MAXLEN);
332 return;
333}
334
335/**
336 * smack_to_cipso - find the CIPSO option to go with a Smack label
337 * @smack: a pointer to the smack label in question
338 * @cp: where to put the result
339 *
340 * Returns zero if a value is available, non-zero otherwise.
341 */
342int smack_to_cipso(const char *smack, struct smack_cipso *cp)
343{
344 struct smack_known *kp;
345
346 for (kp = smack_known; kp != NULL; kp = kp->smk_next)
347 if (kp->smk_known == smack ||
348 strcmp(kp->smk_known, smack) == 0)
349 break;
350
351 if (kp == NULL || kp->smk_cipso == NULL)
352 return -ENOENT;
353
354 memcpy(cp, kp->smk_cipso, sizeof(struct smack_cipso));
355 return 0;
356}
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
new file mode 100644
index 000000000000..1c11e4245859
--- /dev/null
+++ b/security/smack/smack_lsm.c
@@ -0,0 +1,2518 @@
1/*
2 * Simplified MAC Kernel (smack) security module
3 *
4 * This file contains the smack hook function implementations.
5 *
6 * Author:
7 * Casey Schaufler <casey@schaufler-ca.com>
8 *
9 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2,
13 * as published by the Free Software Foundation.
14 */
15
16#include <linux/xattr.h>
17#include <linux/pagemap.h>
18#include <linux/mount.h>
19#include <linux/stat.h>
20#include <linux/ext2_fs.h>
21#include <linux/kd.h>
22#include <asm/ioctls.h>
23#include <linux/tcp.h>
24#include <linux/udp.h>
25#include <linux/mutex.h>
26#include <linux/pipe_fs_i.h>
27#include <net/netlabel.h>
28#include <net/cipso_ipv4.h>
29
30#include "smack.h"
31
32/*
33 * I hope these are the hokeyist lines of code in the module. Casey.
34 */
35#define DEVPTS_SUPER_MAGIC 0x1cd1
36#define SOCKFS_MAGIC 0x534F434B
37#define TMPFS_MAGIC 0x01021994
38
39/**
40 * smk_fetch - Fetch the smack label from a file.
41 * @ip: a pointer to the inode
42 * @dp: a pointer to the dentry
43 *
44 * Returns a pointer to the master list entry for the Smack label
45 * or NULL if there was no label to fetch.
46 */
47static char *smk_fetch(struct inode *ip, struct dentry *dp)
48{
49 int rc;
50 char in[SMK_LABELLEN];
51
52 if (ip->i_op->getxattr == NULL)
53 return NULL;
54
55 rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN);
56 if (rc < 0)
57 return NULL;
58
59 return smk_import(in, rc);
60}
61
62/**
63 * new_inode_smack - allocate an inode security blob
64 * @smack: a pointer to the Smack label to use in the blob
65 *
66 * Returns the new blob or NULL if there's no memory available
67 */
68struct inode_smack *new_inode_smack(char *smack)
69{
70 struct inode_smack *isp;
71
72 isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
73 if (isp == NULL)
74 return NULL;
75
76 isp->smk_inode = smack;
77 isp->smk_flags = 0;
78 mutex_init(&isp->smk_lock);
79
80 return isp;
81}
82
83/*
84 * LSM hooks.
85 * We he, that is fun!
86 */
87
88/**
89 * smack_ptrace - Smack approval on ptrace
90 * @ptp: parent task pointer
91 * @ctp: child task pointer
92 *
93 * Returns 0 if access is OK, an error code otherwise
94 *
95 * Do the capability checks, and require read and write.
96 */
97static int smack_ptrace(struct task_struct *ptp, struct task_struct *ctp)
98{
99 int rc;
100
101 rc = cap_ptrace(ptp, ctp);
102 if (rc != 0)
103 return rc;
104
105 rc = smk_access(ptp->security, ctp->security, MAY_READWRITE);
106 if (rc != 0 && __capable(ptp, CAP_MAC_OVERRIDE))
107 return 0;
108
109 return rc;
110}
111
112/**
113 * smack_syslog - Smack approval on syslog
114 * @type: message type
115 *
116 * Require that the task has the floor label
117 *
118 * Returns 0 on success, error code otherwise.
119 */
120static int smack_syslog(int type)
121{
122 int rc;
123 char *sp = current->security;
124
125 rc = cap_syslog(type);
126 if (rc != 0)
127 return rc;
128
129 if (capable(CAP_MAC_OVERRIDE))
130 return 0;
131
132 if (sp != smack_known_floor.smk_known)
133 rc = -EACCES;
134
135 return rc;
136}
137
138
139/*
140 * Superblock Hooks.
141 */
142
143/**
144 * smack_sb_alloc_security - allocate a superblock blob
145 * @sb: the superblock getting the blob
146 *
147 * Returns 0 on success or -ENOMEM on error.
148 */
149static int smack_sb_alloc_security(struct super_block *sb)
150{
151 struct superblock_smack *sbsp;
152
153 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
154
155 if (sbsp == NULL)
156 return -ENOMEM;
157
158 sbsp->smk_root = smack_known_floor.smk_known;
159 sbsp->smk_default = smack_known_floor.smk_known;
160 sbsp->smk_floor = smack_known_floor.smk_known;
161 sbsp->smk_hat = smack_known_hat.smk_known;
162 sbsp->smk_initialized = 0;
163 spin_lock_init(&sbsp->smk_sblock);
164
165 sb->s_security = sbsp;
166
167 return 0;
168}
169
170/**
171 * smack_sb_free_security - free a superblock blob
172 * @sb: the superblock getting the blob
173 *
174 */
175static void smack_sb_free_security(struct super_block *sb)
176{
177 kfree(sb->s_security);
178 sb->s_security = NULL;
179}
180
181/**
182 * smack_sb_copy_data - copy mount options data for processing
183 * @type: file system type
184 * @orig: where to start
185 * @smackopts
186 *
187 * Returns 0 on success or -ENOMEM on error.
188 *
189 * Copy the Smack specific mount options out of the mount
190 * options list.
191 */
192static int smack_sb_copy_data(struct file_system_type *type, void *orig,
193 void *smackopts)
194{
195 char *cp, *commap, *otheropts, *dp;
196
197 /* Binary mount data: just copy */
198 if (type->fs_flags & FS_BINARY_MOUNTDATA) {
199 copy_page(smackopts, orig);
200 return 0;
201 }
202
203 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
204 if (otheropts == NULL)
205 return -ENOMEM;
206
207 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
208 if (strstr(cp, SMK_FSDEFAULT) == cp)
209 dp = smackopts;
210 else if (strstr(cp, SMK_FSFLOOR) == cp)
211 dp = smackopts;
212 else if (strstr(cp, SMK_FSHAT) == cp)
213 dp = smackopts;
214 else if (strstr(cp, SMK_FSROOT) == cp)
215 dp = smackopts;
216 else
217 dp = otheropts;
218
219 commap = strchr(cp, ',');
220 if (commap != NULL)
221 *commap = '\0';
222
223 if (*dp != '\0')
224 strcat(dp, ",");
225 strcat(dp, cp);
226 }
227
228 strcpy(orig, otheropts);
229 free_page((unsigned long)otheropts);
230
231 return 0;
232}
233
234/**
235 * smack_sb_kern_mount - Smack specific mount processing
236 * @sb: the file system superblock
237 * @data: the smack mount options
238 *
239 * Returns 0 on success, an error code on failure
240 */
241static int smack_sb_kern_mount(struct super_block *sb, void *data)
242{
243 struct dentry *root = sb->s_root;
244 struct inode *inode = root->d_inode;
245 struct superblock_smack *sp = sb->s_security;
246 struct inode_smack *isp;
247 char *op;
248 char *commap;
249 char *nsp;
250
251 spin_lock(&sp->smk_sblock);
252 if (sp->smk_initialized != 0) {
253 spin_unlock(&sp->smk_sblock);
254 return 0;
255 }
256 sp->smk_initialized = 1;
257 spin_unlock(&sp->smk_sblock);
258
259 for (op = data; op != NULL; op = commap) {
260 commap = strchr(op, ',');
261 if (commap != NULL)
262 *commap++ = '\0';
263
264 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
265 op += strlen(SMK_FSHAT);
266 nsp = smk_import(op, 0);
267 if (nsp != NULL)
268 sp->smk_hat = nsp;
269 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
270 op += strlen(SMK_FSFLOOR);
271 nsp = smk_import(op, 0);
272 if (nsp != NULL)
273 sp->smk_floor = nsp;
274 } else if (strncmp(op, SMK_FSDEFAULT,
275 strlen(SMK_FSDEFAULT)) == 0) {
276 op += strlen(SMK_FSDEFAULT);
277 nsp = smk_import(op, 0);
278 if (nsp != NULL)
279 sp->smk_default = nsp;
280 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
281 op += strlen(SMK_FSROOT);
282 nsp = smk_import(op, 0);
283 if (nsp != NULL)
284 sp->smk_root = nsp;
285 }
286 }
287
288 /*
289 * Initialize the root inode.
290 */
291 isp = inode->i_security;
292 if (isp == NULL)
293 inode->i_security = new_inode_smack(sp->smk_root);
294 else
295 isp->smk_inode = sp->smk_root;
296
297 return 0;
298}
299
300/**
301 * smack_sb_statfs - Smack check on statfs
302 * @dentry: identifies the file system in question
303 *
304 * Returns 0 if current can read the floor of the filesystem,
305 * and error code otherwise
306 */
307static int smack_sb_statfs(struct dentry *dentry)
308{
309 struct superblock_smack *sbp = dentry->d_sb->s_security;
310
311 return smk_curacc(sbp->smk_floor, MAY_READ);
312}
313
314/**
315 * smack_sb_mount - Smack check for mounting
316 * @dev_name: unused
317 * @nd: mount point
318 * @type: unused
319 * @flags: unused
320 * @data: unused
321 *
322 * Returns 0 if current can write the floor of the filesystem
323 * being mounted on, an error code otherwise.
324 */
325static int smack_sb_mount(char *dev_name, struct nameidata *nd,
326 char *type, unsigned long flags, void *data)
327{
328 struct superblock_smack *sbp = nd->mnt->mnt_sb->s_security;
329
330 return smk_curacc(sbp->smk_floor, MAY_WRITE);
331}
332
333/**
334 * smack_sb_umount - Smack check for unmounting
335 * @mnt: file system to unmount
336 * @flags: unused
337 *
338 * Returns 0 if current can write the floor of the filesystem
339 * being unmounted, an error code otherwise.
340 */
341static int smack_sb_umount(struct vfsmount *mnt, int flags)
342{
343 struct superblock_smack *sbp;
344
345 sbp = mnt->mnt_sb->s_security;
346
347 return smk_curacc(sbp->smk_floor, MAY_WRITE);
348}
349
350/*
351 * Inode hooks
352 */
353
354/**
355 * smack_inode_alloc_security - allocate an inode blob
356 * @inode - the inode in need of a blob
357 *
358 * Returns 0 if it gets a blob, -ENOMEM otherwise
359 */
360static int smack_inode_alloc_security(struct inode *inode)
361{
362 inode->i_security = new_inode_smack(current->security);
363 if (inode->i_security == NULL)
364 return -ENOMEM;
365 return 0;
366}
367
368/**
369 * smack_inode_free_security - free an inode blob
370 * @inode - the inode with a blob
371 *
372 * Clears the blob pointer in inode
373 */
374static void smack_inode_free_security(struct inode *inode)
375{
376 kfree(inode->i_security);
377 inode->i_security = NULL;
378}
379
380/**
381 * smack_inode_init_security - copy out the smack from an inode
382 * @inode: the inode
383 * @dir: unused
384 * @name: where to put the attribute name
385 * @value: where to put the attribute value
386 * @len: where to put the length of the attribute
387 *
388 * Returns 0 if it all works out, -ENOMEM if there's no memory
389 */
390static int smack_inode_init_security(struct inode *inode, struct inode *dir,
391 char **name, void **value, size_t *len)
392{
393 char *isp = smk_of_inode(inode);
394
395 if (name) {
396 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
397 if (*name == NULL)
398 return -ENOMEM;
399 }
400
401 if (value) {
402 *value = kstrdup(isp, GFP_KERNEL);
403 if (*value == NULL)
404 return -ENOMEM;
405 }
406
407 if (len)
408 *len = strlen(isp) + 1;
409
410 return 0;
411}
412
413/**
414 * smack_inode_link - Smack check on link
415 * @old_dentry: the existing object
416 * @dir: unused
417 * @new_dentry: the new object
418 *
419 * Returns 0 if access is permitted, an error code otherwise
420 */
421static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
422 struct dentry *new_dentry)
423{
424 int rc;
425 char *isp;
426
427 isp = smk_of_inode(old_dentry->d_inode);
428 rc = smk_curacc(isp, MAY_WRITE);
429
430 if (rc == 0 && new_dentry->d_inode != NULL) {
431 isp = smk_of_inode(new_dentry->d_inode);
432 rc = smk_curacc(isp, MAY_WRITE);
433 }
434
435 return rc;
436}
437
438/**
439 * smack_inode_unlink - Smack check on inode deletion
440 * @dir: containing directory object
441 * @dentry: file to unlink
442 *
443 * Returns 0 if current can write the containing directory
444 * and the object, error code otherwise
445 */
446static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
447{
448 struct inode *ip = dentry->d_inode;
449 int rc;
450
451 /*
452 * You need write access to the thing you're unlinking
453 */
454 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE);
455 if (rc == 0)
456 /*
457 * You also need write access to the containing directory
458 */
459 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
460
461 return rc;
462}
463
464/**
465 * smack_inode_rmdir - Smack check on directory deletion
466 * @dir: containing directory object
467 * @dentry: directory to unlink
468 *
469 * Returns 0 if current can write the containing directory
470 * and the directory, error code otherwise
471 */
472static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
473{
474 int rc;
475
476 /*
477 * You need write access to the thing you're removing
478 */
479 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
480 if (rc == 0)
481 /*
482 * You also need write access to the containing directory
483 */
484 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
485
486 return rc;
487}
488
489/**
490 * smack_inode_rename - Smack check on rename
491 * @old_inode: the old directory
492 * @old_dentry: unused
493 * @new_inode: the new directory
494 * @new_dentry: unused
495 *
496 * Read and write access is required on both the old and
497 * new directories.
498 *
499 * Returns 0 if access is permitted, an error code otherwise
500 */
501static int smack_inode_rename(struct inode *old_inode,
502 struct dentry *old_dentry,
503 struct inode *new_inode,
504 struct dentry *new_dentry)
505{
506 int rc;
507 char *isp;
508
509 isp = smk_of_inode(old_dentry->d_inode);
510 rc = smk_curacc(isp, MAY_READWRITE);
511
512 if (rc == 0 && new_dentry->d_inode != NULL) {
513 isp = smk_of_inode(new_dentry->d_inode);
514 rc = smk_curacc(isp, MAY_READWRITE);
515 }
516
517 return rc;
518}
519
520/**
521 * smack_inode_permission - Smack version of permission()
522 * @inode: the inode in question
523 * @mask: the access requested
524 * @nd: unused
525 *
526 * This is the important Smack hook.
527 *
528 * Returns 0 if access is permitted, -EACCES otherwise
529 */
530static int smack_inode_permission(struct inode *inode, int mask,
531 struct nameidata *nd)
532{
533 /*
534 * No permission to check. Existence test. Yup, it's there.
535 */
536 if (mask == 0)
537 return 0;
538
539 return smk_curacc(smk_of_inode(inode), mask);
540}
541
542/**
543 * smack_inode_setattr - Smack check for setting attributes
544 * @dentry: the object
545 * @iattr: for the force flag
546 *
547 * Returns 0 if access is permitted, an error code otherwise
548 */
549static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
550{
551 /*
552 * Need to allow for clearing the setuid bit.
553 */
554 if (iattr->ia_valid & ATTR_FORCE)
555 return 0;
556
557 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
558}
559
560/**
561 * smack_inode_getattr - Smack check for getting attributes
562 * @mnt: unused
563 * @dentry: the object
564 *
565 * Returns 0 if access is permitted, an error code otherwise
566 */
567static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
568{
569 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
570}
571
572/**
573 * smack_inode_setxattr - Smack check for setting xattrs
574 * @dentry: the object
575 * @name: name of the attribute
576 * @value: unused
577 * @size: unused
578 * @flags: unused
579 *
580 * This protects the Smack attribute explicitly.
581 *
582 * Returns 0 if access is permitted, an error code otherwise
583 */
584static int smack_inode_setxattr(struct dentry *dentry, char *name,
585 void *value, size_t size, int flags)
586{
587 if (!capable(CAP_MAC_ADMIN)) {
588 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
589 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
590 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0)
591 return -EPERM;
592 }
593
594 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
595}
596
597/**
598 * smack_inode_post_setxattr - Apply the Smack update approved above
599 * @dentry: object
600 * @name: attribute name
601 * @value: attribute value
602 * @size: attribute size
603 * @flags: unused
604 *
605 * Set the pointer in the inode blob to the entry found
606 * in the master label list.
607 */
608static void smack_inode_post_setxattr(struct dentry *dentry, char *name,
609 void *value, size_t size, int flags)
610{
611 struct inode_smack *isp;
612 char *nsp;
613
614 /*
615 * Not SMACK
616 */
617 if (strcmp(name, XATTR_NAME_SMACK))
618 return;
619
620 if (size >= SMK_LABELLEN)
621 return;
622
623 isp = dentry->d_inode->i_security;
624
625 /*
626 * No locking is done here. This is a pointer
627 * assignment.
628 */
629 nsp = smk_import(value, size);
630 if (nsp != NULL)
631 isp->smk_inode = nsp;
632 else
633 isp->smk_inode = smack_known_invalid.smk_known;
634
635 return;
636}
637
638/*
639 * smack_inode_getxattr - Smack check on getxattr
640 * @dentry: the object
641 * @name: unused
642 *
643 * Returns 0 if access is permitted, an error code otherwise
644 */
645static int smack_inode_getxattr(struct dentry *dentry, char *name)
646{
647 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
648}
649
650/*
651 * smack_inode_removexattr - Smack check on removexattr
652 * @dentry: the object
653 * @name: name of the attribute
654 *
655 * Removing the Smack attribute requires CAP_MAC_ADMIN
656 *
657 * Returns 0 if access is permitted, an error code otherwise
658 */
659static int smack_inode_removexattr(struct dentry *dentry, char *name)
660{
661 if (strcmp(name, XATTR_NAME_SMACK) == 0 && !capable(CAP_MAC_ADMIN))
662 return -EPERM;
663
664 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
665}
666
667/**
668 * smack_inode_getsecurity - get smack xattrs
669 * @inode: the object
670 * @name: attribute name
671 * @buffer: where to put the result
672 * @size: size of the buffer
673 * @err: unused
674 *
675 * Returns the size of the attribute or an error code
676 */
677static int smack_inode_getsecurity(const struct inode *inode,
678 const char *name, void **buffer,
679 bool alloc)
680{
681 struct socket_smack *ssp;
682 struct socket *sock;
683 struct super_block *sbp;
684 struct inode *ip = (struct inode *)inode;
685 char *isp;
686 int ilen;
687 int rc = 0;
688
689 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
690 isp = smk_of_inode(inode);
691 ilen = strlen(isp) + 1;
692 *buffer = isp;
693 return ilen;
694 }
695
696 /*
697 * The rest of the Smack xattrs are only on sockets.
698 */
699 sbp = ip->i_sb;
700 if (sbp->s_magic != SOCKFS_MAGIC)
701 return -EOPNOTSUPP;
702
703 sock = SOCKET_I(ip);
704 if (sock == NULL)
705 return -EOPNOTSUPP;
706
707 ssp = sock->sk->sk_security;
708
709 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
710 isp = ssp->smk_in;
711 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
712 isp = ssp->smk_out;
713 else
714 return -EOPNOTSUPP;
715
716 ilen = strlen(isp) + 1;
717 if (rc == 0) {
718 *buffer = isp;
719 rc = ilen;
720 }
721
722 return rc;
723}
724
725
726/**
727 * smack_inode_listsecurity - list the Smack attributes
728 * @inode: the object
729 * @buffer: where they go
730 * @buffer_size: size of buffer
731 *
732 * Returns 0 on success, -EINVAL otherwise
733 */
734static int smack_inode_listsecurity(struct inode *inode, char *buffer,
735 size_t buffer_size)
736{
737 int len = strlen(XATTR_NAME_SMACK);
738
739 if (buffer != NULL && len <= buffer_size) {
740 memcpy(buffer, XATTR_NAME_SMACK, len);
741 return len;
742 }
743 return -EINVAL;
744}
745
746/*
747 * File Hooks
748 */
749
750/**
751 * smack_file_permission - Smack check on file operations
752 * @file: unused
753 * @mask: unused
754 *
755 * Returns 0
756 *
757 * Should access checks be done on each read or write?
758 * UNICOS and SELinux say yes.
759 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
760 *
761 * I'll say no for now. Smack does not do the frequent
762 * label changing that SELinux does.
763 */
764static int smack_file_permission(struct file *file, int mask)
765{
766 return 0;
767}
768
769/**
770 * smack_file_alloc_security - assign a file security blob
771 * @file: the object
772 *
773 * The security blob for a file is a pointer to the master
774 * label list, so no allocation is done.
775 *
776 * Returns 0
777 */
778static int smack_file_alloc_security(struct file *file)
779{
780 file->f_security = current->security;
781 return 0;
782}
783
784/**
785 * smack_file_free_security - clear a file security blob
786 * @file: the object
787 *
788 * The security blob for a file is a pointer to the master
789 * label list, so no memory is freed.
790 */
791static void smack_file_free_security(struct file *file)
792{
793 file->f_security = NULL;
794}
795
796/**
797 * smack_file_ioctl - Smack check on ioctls
798 * @file: the object
799 * @cmd: what to do
800 * @arg: unused
801 *
802 * Relies heavily on the correct use of the ioctl command conventions.
803 *
804 * Returns 0 if allowed, error code otherwise
805 */
806static int smack_file_ioctl(struct file *file, unsigned int cmd,
807 unsigned long arg)
808{
809 int rc = 0;
810
811 if (_IOC_DIR(cmd) & _IOC_WRITE)
812 rc = smk_curacc(file->f_security, MAY_WRITE);
813
814 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
815 rc = smk_curacc(file->f_security, MAY_READ);
816
817 return rc;
818}
819
820/**
821 * smack_file_lock - Smack check on file locking
822 * @file: the object
823 * @cmd unused
824 *
825 * Returns 0 if current has write access, error code otherwise
826 */
827static int smack_file_lock(struct file *file, unsigned int cmd)
828{
829 return smk_curacc(file->f_security, MAY_WRITE);
830}
831
832/**
833 * smack_file_fcntl - Smack check on fcntl
834 * @file: the object
835 * @cmd: what action to check
836 * @arg: unused
837 *
838 * Returns 0 if current has access, error code otherwise
839 */
840static int smack_file_fcntl(struct file *file, unsigned int cmd,
841 unsigned long arg)
842{
843 int rc;
844
845 switch (cmd) {
846 case F_DUPFD:
847 case F_GETFD:
848 case F_GETFL:
849 case F_GETLK:
850 case F_GETOWN:
851 case F_GETSIG:
852 rc = smk_curacc(file->f_security, MAY_READ);
853 break;
854 case F_SETFD:
855 case F_SETFL:
856 case F_SETLK:
857 case F_SETLKW:
858 case F_SETOWN:
859 case F_SETSIG:
860 rc = smk_curacc(file->f_security, MAY_WRITE);
861 break;
862 default:
863 rc = smk_curacc(file->f_security, MAY_READWRITE);
864 }
865
866 return rc;
867}
868
869/**
870 * smack_file_set_fowner - set the file security blob value
871 * @file: object in question
872 *
873 * Returns 0
874 * Further research may be required on this one.
875 */
876static int smack_file_set_fowner(struct file *file)
877{
878 file->f_security = current->security;
879 return 0;
880}
881
882/**
883 * smack_file_send_sigiotask - Smack on sigio
884 * @tsk: The target task
885 * @fown: the object the signal come from
886 * @signum: unused
887 *
888 * Allow a privileged task to get signals even if it shouldn't
889 *
890 * Returns 0 if a subject with the object's smack could
891 * write to the task, an error code otherwise.
892 */
893static int smack_file_send_sigiotask(struct task_struct *tsk,
894 struct fown_struct *fown, int signum)
895{
896 struct file *file;
897 int rc;
898
899 /*
900 * struct fown_struct is never outside the context of a struct file
901 */
902 file = container_of(fown, struct file, f_owner);
903 rc = smk_access(file->f_security, tsk->security, MAY_WRITE);
904 if (rc != 0 && __capable(tsk, CAP_MAC_OVERRIDE))
905 return 0;
906 return rc;
907}
908
909/**
910 * smack_file_receive - Smack file receive check
911 * @file: the object
912 *
913 * Returns 0 if current has access, error code otherwise
914 */
915static int smack_file_receive(struct file *file)
916{
917 int may = 0;
918
919 /*
920 * This code relies on bitmasks.
921 */
922 if (file->f_mode & FMODE_READ)
923 may = MAY_READ;
924 if (file->f_mode & FMODE_WRITE)
925 may |= MAY_WRITE;
926
927 return smk_curacc(file->f_security, may);
928}
929
930/*
931 * Task hooks
932 */
933
934/**
935 * smack_task_alloc_security - "allocate" a task blob
936 * @tsk: the task in need of a blob
937 *
938 * Smack isn't using copies of blobs. Everyone
939 * points to an immutable list. No alloc required.
940 * No data copy required.
941 *
942 * Always returns 0
943 */
944static int smack_task_alloc_security(struct task_struct *tsk)
945{
946 tsk->security = current->security;
947
948 return 0;
949}
950
951/**
952 * smack_task_free_security - "free" a task blob
953 * @task: the task with the blob
954 *
955 * Smack isn't using copies of blobs. Everyone
956 * points to an immutable list. The blobs never go away.
957 * There is no leak here.
958 */
959static void smack_task_free_security(struct task_struct *task)
960{
961 task->security = NULL;
962}
963
964/**
965 * smack_task_setpgid - Smack check on setting pgid
966 * @p: the task object
967 * @pgid: unused
968 *
969 * Return 0 if write access is permitted
970 */
971static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
972{
973 return smk_curacc(p->security, MAY_WRITE);
974}
975
976/**
977 * smack_task_getpgid - Smack access check for getpgid
978 * @p: the object task
979 *
980 * Returns 0 if current can read the object task, error code otherwise
981 */
982static int smack_task_getpgid(struct task_struct *p)
983{
984 return smk_curacc(p->security, MAY_READ);
985}
986
987/**
988 * smack_task_getsid - Smack access check for getsid
989 * @p: the object task
990 *
991 * Returns 0 if current can read the object task, error code otherwise
992 */
993static int smack_task_getsid(struct task_struct *p)
994{
995 return smk_curacc(p->security, MAY_READ);
996}
997
998/**
999 * smack_task_getsecid - get the secid of the task
1000 * @p: the object task
1001 * @secid: where to put the result
1002 *
1003 * Sets the secid to contain a u32 version of the smack label.
1004 */
1005static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1006{
1007 *secid = smack_to_secid(p->security);
1008}
1009
1010/**
1011 * smack_task_setnice - Smack check on setting nice
1012 * @p: the task object
1013 * @nice: unused
1014 *
1015 * Return 0 if write access is permitted
1016 */
1017static int smack_task_setnice(struct task_struct *p, int nice)
1018{
1019 return smk_curacc(p->security, MAY_WRITE);
1020}
1021
1022/**
1023 * smack_task_setioprio - Smack check on setting ioprio
1024 * @p: the task object
1025 * @ioprio: unused
1026 *
1027 * Return 0 if write access is permitted
1028 */
1029static int smack_task_setioprio(struct task_struct *p, int ioprio)
1030{
1031 return smk_curacc(p->security, MAY_WRITE);
1032}
1033
1034/**
1035 * smack_task_getioprio - Smack check on reading ioprio
1036 * @p: the task object
1037 *
1038 * Return 0 if read access is permitted
1039 */
1040static int smack_task_getioprio(struct task_struct *p)
1041{
1042 return smk_curacc(p->security, MAY_READ);
1043}
1044
1045/**
1046 * smack_task_setscheduler - Smack check on setting scheduler
1047 * @p: the task object
1048 * @policy: unused
1049 * @lp: unused
1050 *
1051 * Return 0 if read access is permitted
1052 */
1053static int smack_task_setscheduler(struct task_struct *p, int policy,
1054 struct sched_param *lp)
1055{
1056 return smk_curacc(p->security, MAY_WRITE);
1057}
1058
1059/**
1060 * smack_task_getscheduler - Smack check on reading scheduler
1061 * @p: the task object
1062 *
1063 * Return 0 if read access is permitted
1064 */
1065static int smack_task_getscheduler(struct task_struct *p)
1066{
1067 return smk_curacc(p->security, MAY_READ);
1068}
1069
1070/**
1071 * smack_task_movememory - Smack check on moving memory
1072 * @p: the task object
1073 *
1074 * Return 0 if write access is permitted
1075 */
1076static int smack_task_movememory(struct task_struct *p)
1077{
1078 return smk_curacc(p->security, MAY_WRITE);
1079}
1080
1081/**
1082 * smack_task_kill - Smack check on signal delivery
1083 * @p: the task object
1084 * @info: unused
1085 * @sig: unused
1086 * @secid: identifies the smack to use in lieu of current's
1087 *
1088 * Return 0 if write access is permitted
1089 *
1090 * The secid behavior is an artifact of an SELinux hack
1091 * in the USB code. Someday it may go away.
1092 */
1093static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1094 int sig, u32 secid)
1095{
1096 /*
1097 * Special cases where signals really ought to go through
1098 * in spite of policy. Stephen Smalley suggests it may
1099 * make sense to change the caller so that it doesn't
1100 * bother with the LSM hook in these cases.
1101 */
1102 if (info != SEND_SIG_NOINFO &&
1103 (is_si_special(info) || SI_FROMKERNEL(info)))
1104 return 0;
1105 /*
1106 * Sending a signal requires that the sender
1107 * can write the receiver.
1108 */
1109 if (secid == 0)
1110 return smk_curacc(p->security, MAY_WRITE);
1111 /*
1112 * If the secid isn't 0 we're dealing with some USB IO
1113 * specific behavior. This is not clean. For one thing
1114 * we can't take privilege into account.
1115 */
1116 return smk_access(smack_from_secid(secid), p->security, MAY_WRITE);
1117}
1118
1119/**
1120 * smack_task_wait - Smack access check for waiting
1121 * @p: task to wait for
1122 *
1123 * Returns 0 if current can wait for p, error code otherwise
1124 */
1125static int smack_task_wait(struct task_struct *p)
1126{
1127 int rc;
1128
1129 rc = smk_access(current->security, p->security, MAY_WRITE);
1130 if (rc == 0)
1131 return 0;
1132
1133 /*
1134 * Allow the operation to succeed if either task
1135 * has privilege to perform operations that might
1136 * account for the smack labels having gotten to
1137 * be different in the first place.
1138 *
1139 * This breaks the strict subjet/object access
1140 * control ideal, taking the object's privilege
1141 * state into account in the decision as well as
1142 * the smack value.
1143 */
1144 if (capable(CAP_MAC_OVERRIDE) || __capable(p, CAP_MAC_OVERRIDE))
1145 return 0;
1146
1147 return rc;
1148}
1149
1150/**
1151 * smack_task_to_inode - copy task smack into the inode blob
1152 * @p: task to copy from
1153 * inode: inode to copy to
1154 *
1155 * Sets the smack pointer in the inode security blob
1156 */
1157static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1158{
1159 struct inode_smack *isp = inode->i_security;
1160 isp->smk_inode = p->security;
1161}
1162
1163/*
1164 * Socket hooks.
1165 */
1166
1167/**
1168 * smack_sk_alloc_security - Allocate a socket blob
1169 * @sk: the socket
1170 * @family: unused
1171 * @priority: memory allocation priority
1172 *
1173 * Assign Smack pointers to current
1174 *
1175 * Returns 0 on success, -ENOMEM is there's no memory
1176 */
1177static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1178{
1179 char *csp = current->security;
1180 struct socket_smack *ssp;
1181
1182 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1183 if (ssp == NULL)
1184 return -ENOMEM;
1185
1186 ssp->smk_in = csp;
1187 ssp->smk_out = csp;
1188 ssp->smk_packet[0] = '\0';
1189
1190 sk->sk_security = ssp;
1191
1192 return 0;
1193}
1194
1195/**
1196 * smack_sk_free_security - Free a socket blob
1197 * @sk: the socket
1198 *
1199 * Clears the blob pointer
1200 */
1201static void smack_sk_free_security(struct sock *sk)
1202{
1203 kfree(sk->sk_security);
1204}
1205
1206/**
1207 * smack_set_catset - convert a capset to netlabel mls categories
1208 * @catset: the Smack categories
1209 * @sap: where to put the netlabel categories
1210 *
1211 * Allocates and fills attr.mls.cat
1212 */
1213static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1214{
1215 unsigned char *cp;
1216 unsigned char m;
1217 int cat;
1218 int rc;
1219 int byte;
1220
1221 if (catset == 0)
1222 return;
1223
1224 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1225 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1226 sap->attr.mls.cat->startbit = 0;
1227
1228 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1229 for (m = 0x80; m != 0; m >>= 1, cat++) {
1230 if ((m & *cp) == 0)
1231 continue;
1232 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1233 cat, GFP_ATOMIC);
1234 }
1235}
1236
1237/**
1238 * smack_to_secattr - fill a secattr from a smack value
1239 * @smack: the smack value
1240 * @nlsp: where the result goes
1241 *
1242 * Casey says that CIPSO is good enough for now.
1243 * It can be used to effect.
1244 * It can also be abused to effect when necessary.
1245 * Appologies to the TSIG group in general and GW in particular.
1246 */
1247static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1248{
1249 struct smack_cipso cipso;
1250 int rc;
1251
1252 switch (smack_net_nltype) {
1253 case NETLBL_NLTYPE_CIPSOV4:
1254 nlsp->domain = NULL;
1255 nlsp->flags = NETLBL_SECATTR_DOMAIN;
1256 nlsp->flags |= NETLBL_SECATTR_MLS_LVL;
1257
1258 rc = smack_to_cipso(smack, &cipso);
1259 if (rc == 0) {
1260 nlsp->attr.mls.lvl = cipso.smk_level;
1261 smack_set_catset(cipso.smk_catset, nlsp);
1262 } else {
1263 nlsp->attr.mls.lvl = smack_cipso_direct;
1264 smack_set_catset(smack, nlsp);
1265 }
1266 break;
1267 default:
1268 break;
1269 }
1270}
1271
1272/**
1273 * smack_netlabel - Set the secattr on a socket
1274 * @sk: the socket
1275 *
1276 * Convert the outbound smack value (smk_out) to a
1277 * secattr and attach it to the socket.
1278 *
1279 * Returns 0 on success or an error code
1280 */
1281static int smack_netlabel(struct sock *sk)
1282{
1283 struct socket_smack *ssp = sk->sk_security;
1284 struct netlbl_lsm_secattr secattr;
1285 int rc = 0;
1286
1287 netlbl_secattr_init(&secattr);
1288 smack_to_secattr(ssp->smk_out, &secattr);
1289 if (secattr.flags != NETLBL_SECATTR_NONE)
1290 rc = netlbl_sock_setattr(sk, &secattr);
1291
1292 netlbl_secattr_destroy(&secattr);
1293 return rc;
1294}
1295
1296/**
1297 * smack_inode_setsecurity - set smack xattrs
1298 * @inode: the object
1299 * @name: attribute name
1300 * @value: attribute value
1301 * @size: size of the attribute
1302 * @flags: unused
1303 *
1304 * Sets the named attribute in the appropriate blob
1305 *
1306 * Returns 0 on success, or an error code
1307 */
1308static int smack_inode_setsecurity(struct inode *inode, const char *name,
1309 const void *value, size_t size, int flags)
1310{
1311 char *sp;
1312 struct inode_smack *nsp = inode->i_security;
1313 struct socket_smack *ssp;
1314 struct socket *sock;
1315
1316 if (value == NULL || size > SMK_LABELLEN)
1317 return -EACCES;
1318
1319 sp = smk_import(value, size);
1320 if (sp == NULL)
1321 return -EINVAL;
1322
1323 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1324 nsp->smk_inode = sp;
1325 return 0;
1326 }
1327 /*
1328 * The rest of the Smack xattrs are only on sockets.
1329 */
1330 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1331 return -EOPNOTSUPP;
1332
1333 sock = SOCKET_I(inode);
1334 if (sock == NULL)
1335 return -EOPNOTSUPP;
1336
1337 ssp = sock->sk->sk_security;
1338
1339 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1340 ssp->smk_in = sp;
1341 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1342 ssp->smk_out = sp;
1343 return smack_netlabel(sock->sk);
1344 } else
1345 return -EOPNOTSUPP;
1346
1347 return 0;
1348}
1349
1350/**
1351 * smack_socket_post_create - finish socket setup
1352 * @sock: the socket
1353 * @family: protocol family
1354 * @type: unused
1355 * @protocol: unused
1356 * @kern: unused
1357 *
1358 * Sets the netlabel information on the socket
1359 *
1360 * Returns 0 on success, and error code otherwise
1361 */
1362static int smack_socket_post_create(struct socket *sock, int family,
1363 int type, int protocol, int kern)
1364{
1365 if (family != PF_INET)
1366 return 0;
1367 /*
1368 * Set the outbound netlbl.
1369 */
1370 return smack_netlabel(sock->sk);
1371}
1372
1373/**
1374 * smack_flags_to_may - convert S_ to MAY_ values
1375 * @flags: the S_ value
1376 *
1377 * Returns the equivalent MAY_ value
1378 */
1379static int smack_flags_to_may(int flags)
1380{
1381 int may = 0;
1382
1383 if (flags & S_IRUGO)
1384 may |= MAY_READ;
1385 if (flags & S_IWUGO)
1386 may |= MAY_WRITE;
1387 if (flags & S_IXUGO)
1388 may |= MAY_EXEC;
1389
1390 return may;
1391}
1392
1393/**
1394 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1395 * @msg: the object
1396 *
1397 * Returns 0
1398 */
1399static int smack_msg_msg_alloc_security(struct msg_msg *msg)
1400{
1401 msg->security = current->security;
1402 return 0;
1403}
1404
1405/**
1406 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1407 * @msg: the object
1408 *
1409 * Clears the blob pointer
1410 */
1411static void smack_msg_msg_free_security(struct msg_msg *msg)
1412{
1413 msg->security = NULL;
1414}
1415
1416/**
1417 * smack_of_shm - the smack pointer for the shm
1418 * @shp: the object
1419 *
1420 * Returns a pointer to the smack value
1421 */
1422static char *smack_of_shm(struct shmid_kernel *shp)
1423{
1424 return (char *)shp->shm_perm.security;
1425}
1426
1427/**
1428 * smack_shm_alloc_security - Set the security blob for shm
1429 * @shp: the object
1430 *
1431 * Returns 0
1432 */
1433static int smack_shm_alloc_security(struct shmid_kernel *shp)
1434{
1435 struct kern_ipc_perm *isp = &shp->shm_perm;
1436
1437 isp->security = current->security;
1438 return 0;
1439}
1440
1441/**
1442 * smack_shm_free_security - Clear the security blob for shm
1443 * @shp: the object
1444 *
1445 * Clears the blob pointer
1446 */
1447static void smack_shm_free_security(struct shmid_kernel *shp)
1448{
1449 struct kern_ipc_perm *isp = &shp->shm_perm;
1450
1451 isp->security = NULL;
1452}
1453
1454/**
1455 * smack_shm_associate - Smack access check for shm
1456 * @shp: the object
1457 * @shmflg: access requested
1458 *
1459 * Returns 0 if current has the requested access, error code otherwise
1460 */
1461static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
1462{
1463 char *ssp = smack_of_shm(shp);
1464 int may;
1465
1466 may = smack_flags_to_may(shmflg);
1467 return smk_curacc(ssp, may);
1468}
1469
1470/**
1471 * smack_shm_shmctl - Smack access check for shm
1472 * @shp: the object
1473 * @cmd: what it wants to do
1474 *
1475 * Returns 0 if current has the requested access, error code otherwise
1476 */
1477static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
1478{
1479 char *ssp = smack_of_shm(shp);
1480 int may;
1481
1482 switch (cmd) {
1483 case IPC_STAT:
1484 case SHM_STAT:
1485 may = MAY_READ;
1486 break;
1487 case IPC_SET:
1488 case SHM_LOCK:
1489 case SHM_UNLOCK:
1490 case IPC_RMID:
1491 may = MAY_READWRITE;
1492 break;
1493 case IPC_INFO:
1494 case SHM_INFO:
1495 /*
1496 * System level information.
1497 */
1498 return 0;
1499 default:
1500 return -EINVAL;
1501 }
1502
1503 return smk_curacc(ssp, may);
1504}
1505
1506/**
1507 * smack_shm_shmat - Smack access for shmat
1508 * @shp: the object
1509 * @shmaddr: unused
1510 * @shmflg: access requested
1511 *
1512 * Returns 0 if current has the requested access, error code otherwise
1513 */
1514static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
1515 int shmflg)
1516{
1517 char *ssp = smack_of_shm(shp);
1518 int may;
1519
1520 may = smack_flags_to_may(shmflg);
1521 return smk_curacc(ssp, may);
1522}
1523
1524/**
1525 * smack_of_sem - the smack pointer for the sem
1526 * @sma: the object
1527 *
1528 * Returns a pointer to the smack value
1529 */
1530static char *smack_of_sem(struct sem_array *sma)
1531{
1532 return (char *)sma->sem_perm.security;
1533}
1534
1535/**
1536 * smack_sem_alloc_security - Set the security blob for sem
1537 * @sma: the object
1538 *
1539 * Returns 0
1540 */
1541static int smack_sem_alloc_security(struct sem_array *sma)
1542{
1543 struct kern_ipc_perm *isp = &sma->sem_perm;
1544
1545 isp->security = current->security;
1546 return 0;
1547}
1548
1549/**
1550 * smack_sem_free_security - Clear the security blob for sem
1551 * @sma: the object
1552 *
1553 * Clears the blob pointer
1554 */
1555static void smack_sem_free_security(struct sem_array *sma)
1556{
1557 struct kern_ipc_perm *isp = &sma->sem_perm;
1558
1559 isp->security = NULL;
1560}
1561
1562/**
1563 * smack_sem_associate - Smack access check for sem
1564 * @sma: the object
1565 * @semflg: access requested
1566 *
1567 * Returns 0 if current has the requested access, error code otherwise
1568 */
1569static int smack_sem_associate(struct sem_array *sma, int semflg)
1570{
1571 char *ssp = smack_of_sem(sma);
1572 int may;
1573
1574 may = smack_flags_to_may(semflg);
1575 return smk_curacc(ssp, may);
1576}
1577
1578/**
1579 * smack_sem_shmctl - Smack access check for sem
1580 * @sma: the object
1581 * @cmd: what it wants to do
1582 *
1583 * Returns 0 if current has the requested access, error code otherwise
1584 */
1585static int smack_sem_semctl(struct sem_array *sma, int cmd)
1586{
1587 char *ssp = smack_of_sem(sma);
1588 int may;
1589
1590 switch (cmd) {
1591 case GETPID:
1592 case GETNCNT:
1593 case GETZCNT:
1594 case GETVAL:
1595 case GETALL:
1596 case IPC_STAT:
1597 case SEM_STAT:
1598 may = MAY_READ;
1599 break;
1600 case SETVAL:
1601 case SETALL:
1602 case IPC_RMID:
1603 case IPC_SET:
1604 may = MAY_READWRITE;
1605 break;
1606 case IPC_INFO:
1607 case SEM_INFO:
1608 /*
1609 * System level information
1610 */
1611 return 0;
1612 default:
1613 return -EINVAL;
1614 }
1615
1616 return smk_curacc(ssp, may);
1617}
1618
1619/**
1620 * smack_sem_semop - Smack checks of semaphore operations
1621 * @sma: the object
1622 * @sops: unused
1623 * @nsops: unused
1624 * @alter: unused
1625 *
1626 * Treated as read and write in all cases.
1627 *
1628 * Returns 0 if access is allowed, error code otherwise
1629 */
1630static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
1631 unsigned nsops, int alter)
1632{
1633 char *ssp = smack_of_sem(sma);
1634
1635 return smk_curacc(ssp, MAY_READWRITE);
1636}
1637
1638/**
1639 * smack_msg_alloc_security - Set the security blob for msg
1640 * @msq: the object
1641 *
1642 * Returns 0
1643 */
1644static int smack_msg_queue_alloc_security(struct msg_queue *msq)
1645{
1646 struct kern_ipc_perm *kisp = &msq->q_perm;
1647
1648 kisp->security = current->security;
1649 return 0;
1650}
1651
1652/**
1653 * smack_msg_free_security - Clear the security blob for msg
1654 * @msq: the object
1655 *
1656 * Clears the blob pointer
1657 */
1658static void smack_msg_queue_free_security(struct msg_queue *msq)
1659{
1660 struct kern_ipc_perm *kisp = &msq->q_perm;
1661
1662 kisp->security = NULL;
1663}
1664
1665/**
1666 * smack_of_msq - the smack pointer for the msq
1667 * @msq: the object
1668 *
1669 * Returns a pointer to the smack value
1670 */
1671static char *smack_of_msq(struct msg_queue *msq)
1672{
1673 return (char *)msq->q_perm.security;
1674}
1675
1676/**
1677 * smack_msg_queue_associate - Smack access check for msg_queue
1678 * @msq: the object
1679 * @msqflg: access requested
1680 *
1681 * Returns 0 if current has the requested access, error code otherwise
1682 */
1683static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
1684{
1685 char *msp = smack_of_msq(msq);
1686 int may;
1687
1688 may = smack_flags_to_may(msqflg);
1689 return smk_curacc(msp, may);
1690}
1691
1692/**
1693 * smack_msg_queue_msgctl - Smack access check for msg_queue
1694 * @msq: the object
1695 * @cmd: what it wants to do
1696 *
1697 * Returns 0 if current has the requested access, error code otherwise
1698 */
1699static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
1700{
1701 char *msp = smack_of_msq(msq);
1702 int may;
1703
1704 switch (cmd) {
1705 case IPC_STAT:
1706 case MSG_STAT:
1707 may = MAY_READ;
1708 break;
1709 case IPC_SET:
1710 case IPC_RMID:
1711 may = MAY_READWRITE;
1712 break;
1713 case IPC_INFO:
1714 case MSG_INFO:
1715 /*
1716 * System level information
1717 */
1718 return 0;
1719 default:
1720 return -EINVAL;
1721 }
1722
1723 return smk_curacc(msp, may);
1724}
1725
1726/**
1727 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1728 * @msq: the object
1729 * @msg: unused
1730 * @msqflg: access requested
1731 *
1732 * Returns 0 if current has the requested access, error code otherwise
1733 */
1734static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
1735 int msqflg)
1736{
1737 char *msp = smack_of_msq(msq);
1738 int rc;
1739
1740 rc = smack_flags_to_may(msqflg);
1741 return smk_curacc(msp, rc);
1742}
1743
1744/**
1745 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1746 * @msq: the object
1747 * @msg: unused
1748 * @target: unused
1749 * @type: unused
1750 * @mode: unused
1751 *
1752 * Returns 0 if current has read and write access, error code otherwise
1753 */
1754static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
1755 struct task_struct *target, long type, int mode)
1756{
1757 char *msp = smack_of_msq(msq);
1758
1759 return smk_curacc(msp, MAY_READWRITE);
1760}
1761
1762/**
1763 * smack_ipc_permission - Smack access for ipc_permission()
1764 * @ipp: the object permissions
1765 * @flag: access requested
1766 *
1767 * Returns 0 if current has read and write access, error code otherwise
1768 */
1769static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
1770{
1771 char *isp = ipp->security;
1772 int may;
1773
1774 may = smack_flags_to_may(flag);
1775 return smk_curacc(isp, may);
1776}
1777
1778/**
1779 * smack_d_instantiate - Make sure the blob is correct on an inode
1780 * @opt_dentry: unused
1781 * @inode: the object
1782 *
1783 * Set the inode's security blob if it hasn't been done already.
1784 */
1785static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
1786{
1787 struct super_block *sbp;
1788 struct superblock_smack *sbsp;
1789 struct inode_smack *isp;
1790 char *csp = current->security;
1791 char *fetched;
1792 char *final;
1793 struct dentry *dp;
1794
1795 if (inode == NULL)
1796 return;
1797
1798 isp = inode->i_security;
1799
1800 mutex_lock(&isp->smk_lock);
1801 /*
1802 * If the inode is already instantiated
1803 * take the quick way out
1804 */
1805 if (isp->smk_flags & SMK_INODE_INSTANT)
1806 goto unlockandout;
1807
1808 sbp = inode->i_sb;
1809 sbsp = sbp->s_security;
1810 /*
1811 * We're going to use the superblock default label
1812 * if there's no label on the file.
1813 */
1814 final = sbsp->smk_default;
1815
1816 /*
1817 * This is pretty hackish.
1818 * Casey says that we shouldn't have to do
1819 * file system specific code, but it does help
1820 * with keeping it simple.
1821 */
1822 switch (sbp->s_magic) {
1823 case SMACK_MAGIC:
1824 /*
1825 * Casey says that it's a little embarassing
1826 * that the smack file system doesn't do
1827 * extended attributes.
1828 */
1829 final = smack_known_star.smk_known;
1830 break;
1831 case PIPEFS_MAGIC:
1832 /*
1833 * Casey says pipes are easy (?)
1834 */
1835 final = smack_known_star.smk_known;
1836 break;
1837 case DEVPTS_SUPER_MAGIC:
1838 /*
1839 * devpts seems content with the label of the task.
1840 * Programs that change smack have to treat the
1841 * pty with respect.
1842 */
1843 final = csp;
1844 break;
1845 case SOCKFS_MAGIC:
1846 /*
1847 * Casey says sockets get the smack of the task.
1848 */
1849 final = csp;
1850 break;
1851 case PROC_SUPER_MAGIC:
1852 /*
1853 * Casey says procfs appears not to care.
1854 * The superblock default suffices.
1855 */
1856 break;
1857 case TMPFS_MAGIC:
1858 /*
1859 * Device labels should come from the filesystem,
1860 * but watch out, because they're volitile,
1861 * getting recreated on every reboot.
1862 */
1863 final = smack_known_star.smk_known;
1864 /*
1865 * No break.
1866 *
1867 * If a smack value has been set we want to use it,
1868 * but since tmpfs isn't giving us the opportunity
1869 * to set mount options simulate setting the
1870 * superblock default.
1871 */
1872 default:
1873 /*
1874 * This isn't an understood special case.
1875 * Get the value from the xattr.
1876 *
1877 * No xattr support means, alas, no SMACK label.
1878 * Use the aforeapplied default.
1879 * It would be curious if the label of the task
1880 * does not match that assigned.
1881 */
1882 if (inode->i_op->getxattr == NULL)
1883 break;
1884 /*
1885 * Get the dentry for xattr.
1886 */
1887 if (opt_dentry == NULL) {
1888 dp = d_find_alias(inode);
1889 if (dp == NULL)
1890 break;
1891 } else {
1892 dp = dget(opt_dentry);
1893 if (dp == NULL)
1894 break;
1895 }
1896
1897 fetched = smk_fetch(inode, dp);
1898 if (fetched != NULL)
1899 final = fetched;
1900
1901 dput(dp);
1902 break;
1903 }
1904
1905 if (final == NULL)
1906 isp->smk_inode = csp;
1907 else
1908 isp->smk_inode = final;
1909
1910 isp->smk_flags |= SMK_INODE_INSTANT;
1911
1912unlockandout:
1913 mutex_unlock(&isp->smk_lock);
1914 return;
1915}
1916
1917/**
1918 * smack_getprocattr - Smack process attribute access
1919 * @p: the object task
1920 * @name: the name of the attribute in /proc/.../attr
1921 * @value: where to put the result
1922 *
1923 * Places a copy of the task Smack into value
1924 *
1925 * Returns the length of the smack label or an error code
1926 */
1927static int smack_getprocattr(struct task_struct *p, char *name, char **value)
1928{
1929 char *cp;
1930 int slen;
1931
1932 if (strcmp(name, "current") != 0)
1933 return -EINVAL;
1934
1935 cp = kstrdup(p->security, GFP_KERNEL);
1936 if (cp == NULL)
1937 return -ENOMEM;
1938
1939 slen = strlen(cp);
1940 *value = cp;
1941 return slen;
1942}
1943
1944/**
1945 * smack_setprocattr - Smack process attribute setting
1946 * @p: the object task
1947 * @name: the name of the attribute in /proc/.../attr
1948 * @value: the value to set
1949 * @size: the size of the value
1950 *
1951 * Sets the Smack value of the task. Only setting self
1952 * is permitted and only with privilege
1953 *
1954 * Returns the length of the smack label or an error code
1955 */
1956static int smack_setprocattr(struct task_struct *p, char *name,
1957 void *value, size_t size)
1958{
1959 char *newsmack;
1960
1961 if (!__capable(p, CAP_MAC_ADMIN))
1962 return -EPERM;
1963
1964 /*
1965 * Changing another process' Smack value is too dangerous
1966 * and supports no sane use case.
1967 */
1968 if (p != current)
1969 return -EPERM;
1970
1971 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
1972 return -EINVAL;
1973
1974 if (strcmp(name, "current") != 0)
1975 return -EINVAL;
1976
1977 newsmack = smk_import(value, size);
1978 if (newsmack == NULL)
1979 return -EINVAL;
1980
1981 p->security = newsmack;
1982 return size;
1983}
1984
1985/**
1986 * smack_unix_stream_connect - Smack access on UDS
1987 * @sock: one socket
1988 * @other: the other socket
1989 * @newsk: unused
1990 *
1991 * Return 0 if a subject with the smack of sock could access
1992 * an object with the smack of other, otherwise an error code
1993 */
1994static int smack_unix_stream_connect(struct socket *sock,
1995 struct socket *other, struct sock *newsk)
1996{
1997 struct inode *sp = SOCK_INODE(sock);
1998 struct inode *op = SOCK_INODE(other);
1999
2000 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE);
2001}
2002
2003/**
2004 * smack_unix_may_send - Smack access on UDS
2005 * @sock: one socket
2006 * @other: the other socket
2007 *
2008 * Return 0 if a subject with the smack of sock could access
2009 * an object with the smack of other, otherwise an error code
2010 */
2011static int smack_unix_may_send(struct socket *sock, struct socket *other)
2012{
2013 struct inode *sp = SOCK_INODE(sock);
2014 struct inode *op = SOCK_INODE(other);
2015
2016 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE);
2017}
2018
2019/**
2020 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2021 * pair to smack
2022 * @sap: netlabel secattr
2023 * @sip: where to put the result
2024 *
2025 * Copies a smack label into sip
2026 */
2027static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2028{
2029 char smack[SMK_LABELLEN];
2030 int pcat;
2031
2032 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) == 0) {
2033 /*
2034 * If there are flags but no level netlabel isn't
2035 * behaving the way we expect it to.
2036 *
2037 * Without guidance regarding the smack value
2038 * for the packet fall back on the network
2039 * ambient value.
2040 */
2041 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
2042 return;
2043 }
2044 /*
2045 * Get the categories, if any
2046 */
2047 memset(smack, '\0', SMK_LABELLEN);
2048 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2049 for (pcat = -1;;) {
2050 pcat = netlbl_secattr_catmap_walk(sap->attr.mls.cat,
2051 pcat + 1);
2052 if (pcat < 0)
2053 break;
2054 smack_catset_bit(pcat, smack);
2055 }
2056 /*
2057 * If it is CIPSO using smack direct mapping
2058 * we are already done. WeeHee.
2059 */
2060 if (sap->attr.mls.lvl == smack_cipso_direct) {
2061 memcpy(sip, smack, SMK_MAXLEN);
2062 return;
2063 }
2064 /*
2065 * Look it up in the supplied table if it is not a direct mapping.
2066 */
2067 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
2068 return;
2069}
2070
2071/**
2072 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2073 * @sk: socket
2074 * @skb: packet
2075 *
2076 * Returns 0 if the packet should be delivered, an error code otherwise
2077 */
2078static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2079{
2080 struct netlbl_lsm_secattr secattr;
2081 struct socket_smack *ssp = sk->sk_security;
2082 char smack[SMK_LABELLEN];
2083 int rc;
2084
2085 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2086 return 0;
2087
2088 /*
2089 * Translate what netlabel gave us.
2090 */
2091 memset(smack, '\0', SMK_LABELLEN);
2092 netlbl_secattr_init(&secattr);
2093 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2094 if (rc == 0)
2095 smack_from_secattr(&secattr, smack);
2096 else
2097 strncpy(smack, smack_net_ambient, SMK_MAXLEN);
2098 netlbl_secattr_destroy(&secattr);
2099 /*
2100 * Receiving a packet requires that the other end
2101 * be able to write here. Read access is not required.
2102 * This is the simplist possible security model
2103 * for networking.
2104 */
2105 return smk_access(smack, ssp->smk_in, MAY_WRITE);
2106}
2107
2108/**
2109 * smack_socket_getpeersec_stream - pull in packet label
2110 * @sock: the socket
2111 * @optval: user's destination
2112 * @optlen: size thereof
2113 * @len: max thereoe
2114 *
2115 * returns zero on success, an error code otherwise
2116 */
2117static int smack_socket_getpeersec_stream(struct socket *sock,
2118 char __user *optval,
2119 int __user *optlen, unsigned len)
2120{
2121 struct socket_smack *ssp;
2122 int slen;
2123 int rc = 0;
2124
2125 ssp = sock->sk->sk_security;
2126 slen = strlen(ssp->smk_packet) + 1;
2127
2128 if (slen > len)
2129 rc = -ERANGE;
2130 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2131 rc = -EFAULT;
2132
2133 if (put_user(slen, optlen) != 0)
2134 rc = -EFAULT;
2135
2136 return rc;
2137}
2138
2139
2140/**
2141 * smack_socket_getpeersec_dgram - pull in packet label
2142 * @sock: the socket
2143 * @skb: packet data
2144 * @secid: pointer to where to put the secid of the packet
2145 *
2146 * Sets the netlabel socket state on sk from parent
2147 */
2148static int smack_socket_getpeersec_dgram(struct socket *sock,
2149 struct sk_buff *skb, u32 *secid)
2150
2151{
2152 struct netlbl_lsm_secattr secattr;
2153 struct sock *sk;
2154 char smack[SMK_LABELLEN];
2155 int family = PF_INET;
2156 u32 s;
2157 int rc;
2158
2159 /*
2160 * Only works for families with packets.
2161 */
2162 if (sock != NULL) {
2163 sk = sock->sk;
2164 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2165 return 0;
2166 family = sk->sk_family;
2167 }
2168 /*
2169 * Translate what netlabel gave us.
2170 */
2171 memset(smack, '\0', SMK_LABELLEN);
2172 netlbl_secattr_init(&secattr);
2173 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2174 if (rc == 0)
2175 smack_from_secattr(&secattr, smack);
2176 netlbl_secattr_destroy(&secattr);
2177
2178 /*
2179 * Give up if we couldn't get anything
2180 */
2181 if (rc != 0)
2182 return rc;
2183
2184 s = smack_to_secid(smack);
2185 if (s == 0)
2186 return -EINVAL;
2187
2188 *secid = s;
2189 return 0;
2190}
2191
2192/**
2193 * smack_sock_graft - graft access state between two sockets
2194 * @sk: fresh sock
2195 * @parent: donor socket
2196 *
2197 * Sets the netlabel socket state on sk from parent
2198 */
2199static void smack_sock_graft(struct sock *sk, struct socket *parent)
2200{
2201 struct socket_smack *ssp;
2202 int rc;
2203
2204 if (sk == NULL)
2205 return;
2206
2207 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2208 return;
2209
2210 ssp = sk->sk_security;
2211 ssp->smk_in = current->security;
2212 ssp->smk_out = current->security;
2213 ssp->smk_packet[0] = '\0';
2214
2215 rc = smack_netlabel(sk);
2216}
2217
2218/**
2219 * smack_inet_conn_request - Smack access check on connect
2220 * @sk: socket involved
2221 * @skb: packet
2222 * @req: unused
2223 *
2224 * Returns 0 if a task with the packet label could write to
2225 * the socket, otherwise an error code
2226 */
2227static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
2228 struct request_sock *req)
2229{
2230 struct netlbl_lsm_secattr skb_secattr;
2231 struct socket_smack *ssp = sk->sk_security;
2232 char smack[SMK_LABELLEN];
2233 int rc;
2234
2235 if (skb == NULL)
2236 return -EACCES;
2237
2238 memset(smack, '\0', SMK_LABELLEN);
2239 netlbl_secattr_init(&skb_secattr);
2240 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr);
2241 if (rc == 0)
2242 smack_from_secattr(&skb_secattr, smack);
2243 else
2244 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
2245 netlbl_secattr_destroy(&skb_secattr);
2246 /*
2247 * Receiving a packet requires that the other end
2248 * be able to write here. Read access is not required.
2249 *
2250 * If the request is successful save the peer's label
2251 * so that SO_PEERCRED can report it.
2252 */
2253 rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
2254 if (rc == 0)
2255 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
2256
2257 return rc;
2258}
2259
2260/*
2261 * Key management security hooks
2262 *
2263 * Casey has not tested key support very heavily.
2264 * The permission check is most likely too restrictive.
2265 * If you care about keys please have a look.
2266 */
2267#ifdef CONFIG_KEYS
2268
2269/**
2270 * smack_key_alloc - Set the key security blob
2271 * @key: object
2272 * @tsk: the task associated with the key
2273 * @flags: unused
2274 *
2275 * No allocation required
2276 *
2277 * Returns 0
2278 */
2279static int smack_key_alloc(struct key *key, struct task_struct *tsk,
2280 unsigned long flags)
2281{
2282 key->security = tsk->security;
2283 return 0;
2284}
2285
2286/**
2287 * smack_key_free - Clear the key security blob
2288 * @key: the object
2289 *
2290 * Clear the blob pointer
2291 */
2292static void smack_key_free(struct key *key)
2293{
2294 key->security = NULL;
2295}
2296
2297/*
2298 * smack_key_permission - Smack access on a key
2299 * @key_ref: gets to the object
2300 * @context: task involved
2301 * @perm: unused
2302 *
2303 * Return 0 if the task has read and write to the object,
2304 * an error code otherwise
2305 */
2306static int smack_key_permission(key_ref_t key_ref,
2307 struct task_struct *context, key_perm_t perm)
2308{
2309 struct key *keyp;
2310
2311 keyp = key_ref_to_ptr(key_ref);
2312 if (keyp == NULL)
2313 return -EINVAL;
2314 /*
2315 * If the key hasn't been initialized give it access so that
2316 * it may do so.
2317 */
2318 if (keyp->security == NULL)
2319 return 0;
2320 /*
2321 * This should not occur
2322 */
2323 if (context->security == NULL)
2324 return -EACCES;
2325
2326 return smk_access(context->security, keyp->security, MAY_READWRITE);
2327}
2328#endif /* CONFIG_KEYS */
2329
2330/*
2331 * smack_secid_to_secctx - return the smack label for a secid
2332 * @secid: incoming integer
2333 * @secdata: destination
2334 * @seclen: how long it is
2335 *
2336 * Exists for networking code.
2337 */
2338static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
2339{
2340 char *sp = smack_from_secid(secid);
2341
2342 *secdata = sp;
2343 *seclen = strlen(sp);
2344 return 0;
2345}
2346
2347/*
2348 * smack_release_secctx - don't do anything.
2349 * @key_ref: unused
2350 * @context: unused
2351 * @perm: unused
2352 *
2353 * Exists to make sure nothing gets done, and properly
2354 */
2355static void smack_release_secctx(char *secdata, u32 seclen)
2356{
2357}
2358
2359static struct security_operations smack_ops = {
2360 .ptrace = smack_ptrace,
2361 .capget = cap_capget,
2362 .capset_check = cap_capset_check,
2363 .capset_set = cap_capset_set,
2364 .capable = cap_capable,
2365 .syslog = smack_syslog,
2366 .settime = cap_settime,
2367 .vm_enough_memory = cap_vm_enough_memory,
2368
2369 .bprm_apply_creds = cap_bprm_apply_creds,
2370 .bprm_set_security = cap_bprm_set_security,
2371 .bprm_secureexec = cap_bprm_secureexec,
2372
2373 .sb_alloc_security = smack_sb_alloc_security,
2374 .sb_free_security = smack_sb_free_security,
2375 .sb_copy_data = smack_sb_copy_data,
2376 .sb_kern_mount = smack_sb_kern_mount,
2377 .sb_statfs = smack_sb_statfs,
2378 .sb_mount = smack_sb_mount,
2379 .sb_umount = smack_sb_umount,
2380
2381 .inode_alloc_security = smack_inode_alloc_security,
2382 .inode_free_security = smack_inode_free_security,
2383 .inode_init_security = smack_inode_init_security,
2384 .inode_link = smack_inode_link,
2385 .inode_unlink = smack_inode_unlink,
2386 .inode_rmdir = smack_inode_rmdir,
2387 .inode_rename = smack_inode_rename,
2388 .inode_permission = smack_inode_permission,
2389 .inode_setattr = smack_inode_setattr,
2390 .inode_getattr = smack_inode_getattr,
2391 .inode_setxattr = smack_inode_setxattr,
2392 .inode_post_setxattr = smack_inode_post_setxattr,
2393 .inode_getxattr = smack_inode_getxattr,
2394 .inode_removexattr = smack_inode_removexattr,
2395 .inode_getsecurity = smack_inode_getsecurity,
2396 .inode_setsecurity = smack_inode_setsecurity,
2397 .inode_listsecurity = smack_inode_listsecurity,
2398
2399 .file_permission = smack_file_permission,
2400 .file_alloc_security = smack_file_alloc_security,
2401 .file_free_security = smack_file_free_security,
2402 .file_ioctl = smack_file_ioctl,
2403 .file_lock = smack_file_lock,
2404 .file_fcntl = smack_file_fcntl,
2405 .file_set_fowner = smack_file_set_fowner,
2406 .file_send_sigiotask = smack_file_send_sigiotask,
2407 .file_receive = smack_file_receive,
2408
2409 .task_alloc_security = smack_task_alloc_security,
2410 .task_free_security = smack_task_free_security,
2411 .task_post_setuid = cap_task_post_setuid,
2412 .task_setpgid = smack_task_setpgid,
2413 .task_getpgid = smack_task_getpgid,
2414 .task_getsid = smack_task_getsid,
2415 .task_getsecid = smack_task_getsecid,
2416 .task_setnice = smack_task_setnice,
2417 .task_setioprio = smack_task_setioprio,
2418 .task_getioprio = smack_task_getioprio,
2419 .task_setscheduler = smack_task_setscheduler,
2420 .task_getscheduler = smack_task_getscheduler,
2421 .task_movememory = smack_task_movememory,
2422 .task_kill = smack_task_kill,
2423 .task_wait = smack_task_wait,
2424 .task_reparent_to_init = cap_task_reparent_to_init,
2425 .task_to_inode = smack_task_to_inode,
2426
2427 .ipc_permission = smack_ipc_permission,
2428
2429 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
2430 .msg_msg_free_security = smack_msg_msg_free_security,
2431
2432 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
2433 .msg_queue_free_security = smack_msg_queue_free_security,
2434 .msg_queue_associate = smack_msg_queue_associate,
2435 .msg_queue_msgctl = smack_msg_queue_msgctl,
2436 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
2437 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
2438
2439 .shm_alloc_security = smack_shm_alloc_security,
2440 .shm_free_security = smack_shm_free_security,
2441 .shm_associate = smack_shm_associate,
2442 .shm_shmctl = smack_shm_shmctl,
2443 .shm_shmat = smack_shm_shmat,
2444
2445 .sem_alloc_security = smack_sem_alloc_security,
2446 .sem_free_security = smack_sem_free_security,
2447 .sem_associate = smack_sem_associate,
2448 .sem_semctl = smack_sem_semctl,
2449 .sem_semop = smack_sem_semop,
2450
2451 .netlink_send = cap_netlink_send,
2452 .netlink_recv = cap_netlink_recv,
2453
2454 .d_instantiate = smack_d_instantiate,
2455
2456 .getprocattr = smack_getprocattr,
2457 .setprocattr = smack_setprocattr,
2458
2459 .unix_stream_connect = smack_unix_stream_connect,
2460 .unix_may_send = smack_unix_may_send,
2461
2462 .socket_post_create = smack_socket_post_create,
2463 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
2464 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
2465 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
2466 .sk_alloc_security = smack_sk_alloc_security,
2467 .sk_free_security = smack_sk_free_security,
2468 .sock_graft = smack_sock_graft,
2469 .inet_conn_request = smack_inet_conn_request,
2470 /* key management security hooks */
2471#ifdef CONFIG_KEYS
2472 .key_alloc = smack_key_alloc,
2473 .key_free = smack_key_free,
2474 .key_permission = smack_key_permission,
2475#endif /* CONFIG_KEYS */
2476 .secid_to_secctx = smack_secid_to_secctx,
2477 .release_secctx = smack_release_secctx,
2478};
2479
2480/**
2481 * smack_init - initialize the smack system
2482 *
2483 * Returns 0
2484 */
2485static __init int smack_init(void)
2486{
2487 printk(KERN_INFO "Smack: Initializing.\n");
2488
2489 /*
2490 * Set the security state for the initial task.
2491 */
2492 current->security = &smack_known_floor.smk_known;
2493
2494 /*
2495 * Initialize locks
2496 */
2497 spin_lock_init(&smack_known_unset.smk_cipsolock);
2498 spin_lock_init(&smack_known_huh.smk_cipsolock);
2499 spin_lock_init(&smack_known_hat.smk_cipsolock);
2500 spin_lock_init(&smack_known_star.smk_cipsolock);
2501 spin_lock_init(&smack_known_floor.smk_cipsolock);
2502 spin_lock_init(&smack_known_invalid.smk_cipsolock);
2503
2504 /*
2505 * Register with LSM
2506 */
2507 if (register_security(&smack_ops))
2508 panic("smack: Unable to register with kernel.\n");
2509
2510 return 0;
2511}
2512
2513/*
2514 * Smack requires early initialization in order to label
2515 * all processes and objects when they are created.
2516 */
2517security_initcall(smack_init);
2518
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
new file mode 100644
index 000000000000..15aa37f65b39
--- /dev/null
+++ b/security/smack/smackfs.c
@@ -0,0 +1,981 @@
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Authors:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
11 *
12 * Special thanks to the authors of selinuxfs.
13 *
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/vmalloc.h>
21#include <linux/security.h>
22#include <linux/mutex.h>
23#include <net/netlabel.h>
24#include <net/cipso_ipv4.h>
25#include <linux/seq_file.h>
26#include <linux/ctype.h>
27#include "smack.h"
28
29/*
30 * smackfs pseudo filesystem.
31 */
32
33enum smk_inos {
34 SMK_ROOT_INO = 2,
35 SMK_LOAD = 3, /* load policy */
36 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
37 SMK_DOI = 5, /* CIPSO DOI */
38 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
39 SMK_AMBIENT = 7, /* internet ambient label */
40 SMK_NLTYPE = 8, /* label scheme to use by default */
41};
42
43/*
44 * List locks
45 */
46static DEFINE_MUTEX(smack_list_lock);
47static DEFINE_MUTEX(smack_cipso_lock);
48
49/*
50 * This is the "ambient" label for network traffic.
51 * If it isn't somehow marked, use this.
52 * It can be reset via smackfs/ambient
53 */
54char *smack_net_ambient = smack_known_floor.smk_known;
55
56/*
57 * This is the default packet marking scheme for network traffic.
58 * It can be reset via smackfs/nltype
59 */
60int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4;
61
62/*
63 * This is the level in a CIPSO header that indicates a
64 * smack label is contained directly in the category set.
65 * It can be reset via smackfs/direct
66 */
67int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
68
69static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
70struct smk_list_entry *smack_list;
71
72#define SEQ_READ_FINISHED 1
73
74/*
75 * Disable concurrent writing open() operations
76 */
77static struct semaphore smack_write_sem;
78
79/*
80 * Values for parsing cipso rules
81 * SMK_DIGITLEN: Length of a digit field in a rule.
82 * SMK_CIPSOMEN: Minimum possible cipso rule length.
83 */
84#define SMK_DIGITLEN 4
85#define SMK_CIPSOMIN (SMK_MAXLEN + 2 * SMK_DIGITLEN)
86
87/*
88 * Seq_file read operations for /smack/load
89 */
90
91static void *load_seq_start(struct seq_file *s, loff_t *pos)
92{
93 if (*pos == SEQ_READ_FINISHED)
94 return NULL;
95
96 return smack_list;
97}
98
99static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
100{
101 struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
102
103 if (skp == NULL)
104 *pos = SEQ_READ_FINISHED;
105
106 return skp;
107}
108
109static int load_seq_show(struct seq_file *s, void *v)
110{
111 struct smk_list_entry *slp = (struct smk_list_entry *) v;
112 struct smack_rule *srp = &slp->smk_rule;
113
114 seq_printf(s, "%s %s", (char *)srp->smk_subject,
115 (char *)srp->smk_object);
116
117 seq_putc(s, ' ');
118
119 if (srp->smk_access & MAY_READ)
120 seq_putc(s, 'r');
121 if (srp->smk_access & MAY_WRITE)
122 seq_putc(s, 'w');
123 if (srp->smk_access & MAY_EXEC)
124 seq_putc(s, 'x');
125 if (srp->smk_access & MAY_APPEND)
126 seq_putc(s, 'a');
127 if (srp->smk_access == 0)
128 seq_putc(s, '-');
129
130 seq_putc(s, '\n');
131
132 return 0;
133}
134
135static void load_seq_stop(struct seq_file *s, void *v)
136{
137 /* No-op */
138}
139
140static struct seq_operations load_seq_ops = {
141 .start = load_seq_start,
142 .next = load_seq_next,
143 .show = load_seq_show,
144 .stop = load_seq_stop,
145};
146
147/**
148 * smk_open_load - open() for /smack/load
149 * @inode: inode structure representing file
150 * @file: "load" file pointer
151 *
152 * For reading, use load_seq_* seq_file reading operations.
153 */
154static int smk_open_load(struct inode *inode, struct file *file)
155{
156 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
157 return seq_open(file, &load_seq_ops);
158
159 if (down_interruptible(&smack_write_sem))
160 return -ERESTARTSYS;
161
162 return 0;
163}
164
165/**
166 * smk_release_load - release() for /smack/load
167 * @inode: inode structure representing file
168 * @file: "load" file pointer
169 *
170 * For a reading session, use the seq_file release
171 * implementation.
172 * Otherwise, we are at the end of a writing session so
173 * clean everything up.
174 */
175static int smk_release_load(struct inode *inode, struct file *file)
176{
177 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
178 return seq_release(inode, file);
179
180 up(&smack_write_sem);
181 return 0;
182}
183
184/**
185 * smk_set_access - add a rule to the rule list
186 * @srp: the new rule to add
187 *
188 * Looks through the current subject/object/access list for
189 * the subject/object pair and replaces the access that was
190 * there. If the pair isn't found add it with the specified
191 * access.
192 */
193static void smk_set_access(struct smack_rule *srp)
194{
195 struct smk_list_entry *sp;
196 struct smk_list_entry *newp;
197
198 mutex_lock(&smack_list_lock);
199
200 for (sp = smack_list; sp != NULL; sp = sp->smk_next)
201 if (sp->smk_rule.smk_subject == srp->smk_subject &&
202 sp->smk_rule.smk_object == srp->smk_object) {
203 sp->smk_rule.smk_access = srp->smk_access;
204 break;
205 }
206
207 if (sp == NULL) {
208 newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
209 newp->smk_rule = *srp;
210 newp->smk_next = smack_list;
211 smack_list = newp;
212 }
213
214 mutex_unlock(&smack_list_lock);
215
216 return;
217}
218
219/**
220 * smk_write_load - write() for /smack/load
221 * @filp: file pointer, not actually used
222 * @buf: where to get the data from
223 * @count: bytes sent
224 * @ppos: where to start - must be 0
225 *
226 * Get one smack access rule from above.
227 * The format is exactly:
228 * char subject[SMK_LABELLEN]
229 * char object[SMK_LABELLEN]
230 * char access[SMK_ACCESSKINDS]
231 *
232 * Anything following is commentary and ignored.
233 *
234 * writes must be SMK_LABELLEN+SMK_LABELLEN+4 bytes.
235 */
236#define MINIMUM_LOAD (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSKINDS)
237
238static ssize_t smk_write_load(struct file *file, const char __user *buf,
239 size_t count, loff_t *ppos)
240{
241 struct smack_rule rule;
242 char *data;
243 int rc = -EINVAL;
244
245 /*
246 * Must have privilege.
247 * No partial writes.
248 * Enough data must be present.
249 */
250 if (!capable(CAP_MAC_ADMIN))
251 return -EPERM;
252 if (*ppos != 0)
253 return -EINVAL;
254 if (count < MINIMUM_LOAD)
255 return -EINVAL;
256
257 data = kzalloc(count, GFP_KERNEL);
258 if (data == NULL)
259 return -ENOMEM;
260
261 if (copy_from_user(data, buf, count) != 0) {
262 rc = -EFAULT;
263 goto out;
264 }
265
266 rule.smk_subject = smk_import(data, 0);
267 if (rule.smk_subject == NULL)
268 goto out;
269
270 rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
271 if (rule.smk_object == NULL)
272 goto out;
273
274 rule.smk_access = 0;
275
276 switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
277 case '-':
278 break;
279 case 'r':
280 case 'R':
281 rule.smk_access |= MAY_READ;
282 break;
283 default:
284 goto out;
285 }
286
287 switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
288 case '-':
289 break;
290 case 'w':
291 case 'W':
292 rule.smk_access |= MAY_WRITE;
293 break;
294 default:
295 goto out;
296 }
297
298 switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
299 case '-':
300 break;
301 case 'x':
302 case 'X':
303 rule.smk_access |= MAY_EXEC;
304 break;
305 default:
306 goto out;
307 }
308
309 switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
310 case '-':
311 break;
312 case 'a':
313 case 'A':
314 rule.smk_access |= MAY_READ;
315 break;
316 default:
317 goto out;
318 }
319
320 smk_set_access(&rule);
321 rc = count;
322
323out:
324 kfree(data);
325 return rc;
326}
327
328static const struct file_operations smk_load_ops = {
329 .open = smk_open_load,
330 .read = seq_read,
331 .llseek = seq_lseek,
332 .write = smk_write_load,
333 .release = smk_release_load,
334};
335
336/**
337 * smk_cipso_doi - initialize the CIPSO domain
338 */
339void smk_cipso_doi(void)
340{
341 int rc;
342 struct cipso_v4_doi *doip;
343 struct netlbl_audit audit_info;
344
345 rc = netlbl_cfg_map_del(NULL, &audit_info);
346 if (rc != 0)
347 printk(KERN_WARNING "%s:%d remove rc = %d\n",
348 __func__, __LINE__, rc);
349
350 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
351 if (doip == NULL)
352 panic("smack: Failed to initialize cipso DOI.\n");
353 doip->map.std = NULL;
354 doip->doi = smk_cipso_doi_value;
355 doip->type = CIPSO_V4_MAP_PASS;
356 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
357 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
358 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
359
360 rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info);
361 if (rc != 0)
362 printk(KERN_WARNING "%s:%d add rc = %d\n",
363 __func__, __LINE__, rc);
364}
365
366/*
367 * Seq_file read operations for /smack/cipso
368 */
369
370static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
371{
372 if (*pos == SEQ_READ_FINISHED)
373 return NULL;
374
375 return smack_known;
376}
377
378static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
379{
380 struct smack_known *skp = ((struct smack_known *) v)->smk_next;
381
382 /*
383 * Omit labels with no associated cipso value
384 */
385 while (skp != NULL && !skp->smk_cipso)
386 skp = skp->smk_next;
387
388 if (skp == NULL)
389 *pos = SEQ_READ_FINISHED;
390
391 return skp;
392}
393
394/*
395 * Print cipso labels in format:
396 * label level[/cat[,cat]]
397 */
398static int cipso_seq_show(struct seq_file *s, void *v)
399{
400 struct smack_known *skp = (struct smack_known *) v;
401 struct smack_cipso *scp = skp->smk_cipso;
402 char *cbp;
403 char sep = '/';
404 int cat = 1;
405 int i;
406 unsigned char m;
407
408 if (scp == NULL)
409 return 0;
410
411 seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
412
413 cbp = scp->smk_catset;
414 for (i = 0; i < SMK_LABELLEN; i++)
415 for (m = 0x80; m != 0; m >>= 1) {
416 if (m & cbp[i]) {
417 seq_printf(s, "%c%d", sep, cat);
418 sep = ',';
419 }
420 cat++;
421 }
422
423 seq_putc(s, '\n');
424
425 return 0;
426}
427
428static void cipso_seq_stop(struct seq_file *s, void *v)
429{
430 /* No-op */
431}
432
433static struct seq_operations cipso_seq_ops = {
434 .start = cipso_seq_start,
435 .stop = cipso_seq_stop,
436 .next = cipso_seq_next,
437 .show = cipso_seq_show,
438};
439
440/**
441 * smk_open_cipso - open() for /smack/cipso
442 * @inode: inode structure representing file
443 * @file: "cipso" file pointer
444 *
445 * Connect our cipso_seq_* operations with /smack/cipso
446 * file_operations
447 */
448static int smk_open_cipso(struct inode *inode, struct file *file)
449{
450 return seq_open(file, &cipso_seq_ops);
451}
452
453/**
454 * smk_write_cipso - write() for /smack/cipso
455 * @filp: file pointer, not actually used
456 * @buf: where to get the data from
457 * @count: bytes sent
458 * @ppos: where to start
459 *
460 * Accepts only one cipso rule per write call.
461 * Returns number of bytes written or error code, as appropriate
462 */
463static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
464 size_t count, loff_t *ppos)
465{
466 struct smack_known *skp;
467 struct smack_cipso *scp = NULL;
468 char mapcatset[SMK_LABELLEN];
469 int maplevel;
470 int cat;
471 int catlen;
472 ssize_t rc = -EINVAL;
473 char *data = NULL;
474 char *rule;
475 int ret;
476 int i;
477
478 /*
479 * Must have privilege.
480 * No partial writes.
481 * Enough data must be present.
482 */
483 if (!capable(CAP_MAC_ADMIN))
484 return -EPERM;
485 if (*ppos != 0)
486 return -EINVAL;
487 if (count <= SMK_CIPSOMIN)
488 return -EINVAL;
489
490 data = kzalloc(count + 1, GFP_KERNEL);
491 if (data == NULL)
492 return -ENOMEM;
493
494 if (copy_from_user(data, buf, count) != 0) {
495 rc = -EFAULT;
496 goto unlockedout;
497 }
498
499 data[count] = '\0';
500 rule = data;
501 /*
502 * Only allow one writer at a time. Writes should be
503 * quite rare and small in any case.
504 */
505 mutex_lock(&smack_cipso_lock);
506
507 skp = smk_import_entry(rule, 0);
508 if (skp == NULL)
509 goto out;
510
511 rule += SMK_LABELLEN;;
512 ret = sscanf(rule, "%d", &maplevel);
513 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
514 goto out;
515
516 rule += SMK_DIGITLEN;
517 ret = sscanf(rule, "%d", &catlen);
518 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
519 goto out;
520
521 if (count <= (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
522 goto out;
523
524 memset(mapcatset, 0, sizeof(mapcatset));
525
526 for (i = 0; i < catlen; i++) {
527 rule += SMK_DIGITLEN;
528 ret = sscanf(rule, "%d", &cat);
529 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
530 goto out;
531
532 smack_catset_bit(cat, mapcatset);
533 }
534
535 if (skp->smk_cipso == NULL) {
536 scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
537 if (scp == NULL) {
538 rc = -ENOMEM;
539 goto out;
540 }
541 }
542
543 spin_lock_bh(&skp->smk_cipsolock);
544
545 if (scp == NULL)
546 scp = skp->smk_cipso;
547 else
548 skp->smk_cipso = scp;
549
550 scp->smk_level = maplevel;
551 memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
552
553 spin_unlock_bh(&skp->smk_cipsolock);
554
555 rc = count;
556out:
557 mutex_unlock(&smack_cipso_lock);
558unlockedout:
559 kfree(data);
560 return rc;
561}
562
563static const struct file_operations smk_cipso_ops = {
564 .open = smk_open_cipso,
565 .read = seq_read,
566 .llseek = seq_lseek,
567 .write = smk_write_cipso,
568 .release = seq_release,
569};
570
571/**
572 * smk_read_doi - read() for /smack/doi
573 * @filp: file pointer, not actually used
574 * @buf: where to put the result
575 * @count: maximum to send along
576 * @ppos: where to start
577 *
578 * Returns number of bytes read or error code, as appropriate
579 */
580static ssize_t smk_read_doi(struct file *filp, char __user *buf,
581 size_t count, loff_t *ppos)
582{
583 char temp[80];
584 ssize_t rc;
585
586 if (*ppos != 0)
587 return 0;
588
589 sprintf(temp, "%d", smk_cipso_doi_value);
590 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
591
592 return rc;
593}
594
595/**
596 * smk_write_doi - write() for /smack/doi
597 * @filp: file pointer, not actually used
598 * @buf: where to get the data from
599 * @count: bytes sent
600 * @ppos: where to start
601 *
602 * Returns number of bytes written or error code, as appropriate
603 */
604static ssize_t smk_write_doi(struct file *file, const char __user *buf,
605 size_t count, loff_t *ppos)
606{
607 char temp[80];
608 int i;
609
610 if (!capable(CAP_MAC_ADMIN))
611 return -EPERM;
612
613 if (count >= sizeof(temp) || count == 0)
614 return -EINVAL;
615
616 if (copy_from_user(temp, buf, count) != 0)
617 return -EFAULT;
618
619 temp[count] = '\0';
620
621 if (sscanf(temp, "%d", &i) != 1)
622 return -EINVAL;
623
624 smk_cipso_doi_value = i;
625
626 smk_cipso_doi();
627
628 return count;
629}
630
631static const struct file_operations smk_doi_ops = {
632 .read = smk_read_doi,
633 .write = smk_write_doi,
634};
635
636/**
637 * smk_read_direct - read() for /smack/direct
638 * @filp: file pointer, not actually used
639 * @buf: where to put the result
640 * @count: maximum to send along
641 * @ppos: where to start
642 *
643 * Returns number of bytes read or error code, as appropriate
644 */
645static ssize_t smk_read_direct(struct file *filp, char __user *buf,
646 size_t count, loff_t *ppos)
647{
648 char temp[80];
649 ssize_t rc;
650
651 if (*ppos != 0)
652 return 0;
653
654 sprintf(temp, "%d", smack_cipso_direct);
655 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
656
657 return rc;
658}
659
660/**
661 * smk_write_direct - write() for /smack/direct
662 * @filp: file pointer, not actually used
663 * @buf: where to get the data from
664 * @count: bytes sent
665 * @ppos: where to start
666 *
667 * Returns number of bytes written or error code, as appropriate
668 */
669static ssize_t smk_write_direct(struct file *file, const char __user *buf,
670 size_t count, loff_t *ppos)
671{
672 char temp[80];
673 int i;
674
675 if (!capable(CAP_MAC_ADMIN))
676 return -EPERM;
677
678 if (count >= sizeof(temp) || count == 0)
679 return -EINVAL;
680
681 if (copy_from_user(temp, buf, count) != 0)
682 return -EFAULT;
683
684 temp[count] = '\0';
685
686 if (sscanf(temp, "%d", &i) != 1)
687 return -EINVAL;
688
689 smack_cipso_direct = i;
690
691 return count;
692}
693
694static const struct file_operations smk_direct_ops = {
695 .read = smk_read_direct,
696 .write = smk_write_direct,
697};
698
699/**
700 * smk_read_ambient - read() for /smack/ambient
701 * @filp: file pointer, not actually used
702 * @buf: where to put the result
703 * @cn: maximum to send along
704 * @ppos: where to start
705 *
706 * Returns number of bytes read or error code, as appropriate
707 */
708static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
709 size_t cn, loff_t *ppos)
710{
711 ssize_t rc;
712 char out[SMK_LABELLEN];
713 int asize;
714
715 if (*ppos != 0)
716 return 0;
717 /*
718 * Being careful to avoid a problem in the case where
719 * smack_net_ambient gets changed in midstream.
720 * Since smack_net_ambient is always set with a value
721 * from the label list, including initially, and those
722 * never get freed, the worst case is that the pointer
723 * gets changed just after this strncpy, in which case
724 * the value passed up is incorrect. Locking around
725 * smack_net_ambient wouldn't be any better than this
726 * copy scheme as by the time the caller got to look
727 * at the ambient value it would have cleared the lock
728 * and been changed.
729 */
730 strncpy(out, smack_net_ambient, SMK_LABELLEN);
731 asize = strlen(out) + 1;
732
733 if (cn < asize)
734 return -EINVAL;
735
736 rc = simple_read_from_buffer(buf, cn, ppos, out, asize);
737
738 return rc;
739}
740
741/**
742 * smk_write_ambient - write() for /smack/ambient
743 * @filp: file pointer, not actually used
744 * @buf: where to get the data from
745 * @count: bytes sent
746 * @ppos: where to start
747 *
748 * Returns number of bytes written or error code, as appropriate
749 */
750static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
751 size_t count, loff_t *ppos)
752{
753 char in[SMK_LABELLEN];
754 char *smack;
755
756 if (!capable(CAP_MAC_ADMIN))
757 return -EPERM;
758
759 if (count >= SMK_LABELLEN)
760 return -EINVAL;
761
762 if (copy_from_user(in, buf, count) != 0)
763 return -EFAULT;
764
765 smack = smk_import(in, count);
766 if (smack == NULL)
767 return -EINVAL;
768
769 smack_net_ambient = smack;
770
771 return count;
772}
773
774static const struct file_operations smk_ambient_ops = {
775 .read = smk_read_ambient,
776 .write = smk_write_ambient,
777};
778
779struct option_names {
780 int o_number;
781 char *o_name;
782 char *o_alias;
783};
784
785static struct option_names netlbl_choices[] = {
786 { NETLBL_NLTYPE_RIPSO,
787 NETLBL_NLTYPE_RIPSO_NAME, "ripso" },
788 { NETLBL_NLTYPE_CIPSOV4,
789 NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" },
790 { NETLBL_NLTYPE_CIPSOV4,
791 NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" },
792 { NETLBL_NLTYPE_CIPSOV6,
793 NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" },
794 { NETLBL_NLTYPE_UNLABELED,
795 NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" },
796};
797
798/**
799 * smk_read_nltype - read() for /smack/nltype
800 * @filp: file pointer, not actually used
801 * @buf: where to put the result
802 * @count: maximum to send along
803 * @ppos: where to start
804 *
805 * Returns number of bytes read or error code, as appropriate
806 */
807static ssize_t smk_read_nltype(struct file *filp, char __user *buf,
808 size_t count, loff_t *ppos)
809{
810 char bound[40];
811 ssize_t rc;
812 int i;
813
814 if (count < SMK_LABELLEN)
815 return -EINVAL;
816
817 if (*ppos != 0)
818 return 0;
819
820 sprintf(bound, "unknown");
821
822 for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
823 if (smack_net_nltype == netlbl_choices[i].o_number) {
824 sprintf(bound, "%s", netlbl_choices[i].o_name);
825 break;
826 }
827
828 rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound));
829
830 return rc;
831}
832
833/**
834 * smk_write_nltype - write() for /smack/nltype
835 * @filp: file pointer, not actually used
836 * @buf: where to get the data from
837 * @count: bytes sent
838 * @ppos: where to start
839 *
840 * Returns number of bytes written or error code, as appropriate
841 */
842static ssize_t smk_write_nltype(struct file *file, const char __user *buf,
843 size_t count, loff_t *ppos)
844{
845 char bound[40];
846 char *cp;
847 int i;
848
849 if (!capable(CAP_MAC_ADMIN))
850 return -EPERM;
851
852 if (count >= 40)
853 return -EINVAL;
854
855 if (copy_from_user(bound, buf, count) != 0)
856 return -EFAULT;
857
858 bound[count] = '\0';
859 cp = strchr(bound, ' ');
860 if (cp != NULL)
861 *cp = '\0';
862 cp = strchr(bound, '\n');
863 if (cp != NULL)
864 *cp = '\0';
865
866 for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
867 if (strcmp(bound, netlbl_choices[i].o_name) == 0 ||
868 strcmp(bound, netlbl_choices[i].o_alias) == 0) {
869 smack_net_nltype = netlbl_choices[i].o_number;
870 return count;
871 }
872 /*
873 * Not a valid choice.
874 */
875 return -EINVAL;
876}
877
878static const struct file_operations smk_nltype_ops = {
879 .read = smk_read_nltype,
880 .write = smk_write_nltype,
881};
882
883/**
884 * smk_fill_super - fill the /smackfs superblock
885 * @sb: the empty superblock
886 * @data: unused
887 * @silent: unused
888 *
889 * Fill in the well known entries for /smack
890 *
891 * Returns 0 on success, an error code on failure
892 */
893static int smk_fill_super(struct super_block *sb, void *data, int silent)
894{
895 int rc;
896 struct inode *root_inode;
897
898 static struct tree_descr smack_files[] = {
899 [SMK_LOAD] =
900 {"load", &smk_load_ops, S_IRUGO|S_IWUSR},
901 [SMK_CIPSO] =
902 {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
903 [SMK_DOI] =
904 {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
905 [SMK_DIRECT] =
906 {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
907 [SMK_AMBIENT] =
908 {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
909 [SMK_NLTYPE] =
910 {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR},
911 /* last one */ {""}
912 };
913
914 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
915 if (rc != 0) {
916 printk(KERN_ERR "%s failed %d while creating inodes\n",
917 __func__, rc);
918 return rc;
919 }
920
921 root_inode = sb->s_root->d_inode;
922 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
923
924 return 0;
925}
926
927/**
928 * smk_get_sb - get the smackfs superblock
929 * @fs_type: passed along without comment
930 * @flags: passed along without comment
931 * @dev_name: passed along without comment
932 * @data: passed along without comment
933 * @mnt: passed along without comment
934 *
935 * Just passes everything along.
936 *
937 * Returns what the lower level code does.
938 */
939static int smk_get_sb(struct file_system_type *fs_type,
940 int flags, const char *dev_name, void *data,
941 struct vfsmount *mnt)
942{
943 return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
944}
945
946static struct file_system_type smk_fs_type = {
947 .name = "smackfs",
948 .get_sb = smk_get_sb,
949 .kill_sb = kill_litter_super,
950};
951
952static struct vfsmount *smackfs_mount;
953
954/**
955 * init_smk_fs - get the smackfs superblock
956 *
957 * register the smackfs
958 *
959 * Returns 0 unless the registration fails.
960 */
961static int __init init_smk_fs(void)
962{
963 int err;
964
965 err = register_filesystem(&smk_fs_type);
966 if (!err) {
967 smackfs_mount = kern_mount(&smk_fs_type);
968 if (IS_ERR(smackfs_mount)) {
969 printk(KERN_ERR "smackfs: could not mount!\n");
970 err = PTR_ERR(smackfs_mount);
971 smackfs_mount = NULL;
972 }
973 }
974
975 sema_init(&smack_write_sem, 1);
976 smk_cipso_doi();
977
978 return err;
979}
980
981__initcall(init_smk_fs);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-06 17:45:45 -0500