2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
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.
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
12 * Special thanks to the authors of selinuxfs.
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
19 #include <linux/kernel.h>
20 #include <linux/vmalloc.h>
21 #include <linux/security.h>
22 #include <linux/mutex.h>
23 #include <linux/slab.h>
24 #include <net/net_namespace.h>
25 #include <net/cipso_ipv4.h>
26 #include <linux/seq_file.h>
27 #include <linux/ctype.h>
28 #include <linux/audit.h>
29 #include <linux/magic.h>
33 * smackfs pseudo filesystem.
38 SMK_LOAD
= 3, /* load policy */
39 SMK_CIPSO
= 4, /* load label -> CIPSO mapping */
40 SMK_DOI
= 5, /* CIPSO DOI */
41 SMK_DIRECT
= 6, /* CIPSO level indicating direct label */
42 SMK_AMBIENT
= 7, /* internet ambient label */
43 SMK_NETLBLADDR
= 8, /* single label hosts */
44 SMK_ONLYCAP
= 9, /* the only "capable" label */
45 SMK_LOGGING
= 10, /* logging */
46 SMK_LOAD_SELF
= 11, /* task specific rules */
47 SMK_ACCESSES
= 12, /* access policy */
48 SMK_MAPPED
= 13, /* CIPSO level indicating mapped label */
49 SMK_LOAD2
= 14, /* load policy with long labels */
50 SMK_LOAD_SELF2
= 15, /* load task specific rules with long labels */
51 SMK_ACCESS2
= 16, /* make an access check with long labels */
52 SMK_CIPSO2
= 17, /* load long label -> CIPSO mapping */
53 SMK_REVOKE_SUBJ
= 18, /* set rules with subject label to '-' */
54 SMK_CHANGE_RULE
= 19, /* change or add rules (long labels) */
55 SMK_SYSLOG
= 20, /* change syslog label) */
61 static DEFINE_MUTEX(smack_cipso_lock
);
62 static DEFINE_MUTEX(smack_ambient_lock
);
63 static DEFINE_MUTEX(smack_syslog_lock
);
64 static DEFINE_MUTEX(smk_netlbladdr_lock
);
67 * This is the "ambient" label for network traffic.
68 * If it isn't somehow marked, use this.
69 * It can be reset via smackfs/ambient
71 struct smack_known
*smack_net_ambient
;
74 * This is the level in a CIPSO header that indicates a
75 * smack label is contained directly in the category set.
76 * It can be reset via smackfs/direct
78 int smack_cipso_direct
= SMACK_CIPSO_DIRECT_DEFAULT
;
81 * This is the level in a CIPSO header that indicates a
82 * secid is contained directly in the category set.
83 * It can be reset via smackfs/mapped
85 int smack_cipso_mapped
= SMACK_CIPSO_MAPPED_DEFAULT
;
88 * Unless a process is running with this label even
89 * having CAP_MAC_OVERRIDE isn't enough to grant
90 * privilege to violate MAC policy. If no label is
91 * designated (the NULL case) capabilities apply to
92 * everyone. It is expected that the hat (^) label
93 * will be used if any label is used.
95 struct smack_known
*smack_onlycap
;
98 * If this value is set restrict syslog use to the label specified.
99 * It can be reset via smackfs/syslog
101 struct smack_known
*smack_syslog_label
;
104 * Certain IP addresses may be designated as single label hosts.
105 * Packets are sent there unlabeled, but only from tasks that
106 * can write to the specified label.
109 LIST_HEAD(smk_netlbladdr_list
);
112 * Rule lists are maintained for each label.
113 * This master list is just for reading /smack/load and /smack/load2.
115 struct smack_master_list
{
116 struct list_head list
;
117 struct smack_rule
*smk_rule
;
120 LIST_HEAD(smack_rule_list
);
122 struct smack_parsed_rule
{
123 struct smack_known
*smk_subject
;
129 static int smk_cipso_doi_value
= SMACK_CIPSO_DOI_DEFAULT
;
131 const char *smack_cipso_option
= SMACK_CIPSO_OPTION
;
134 * Values for parsing cipso rules
135 * SMK_DIGITLEN: Length of a digit field in a rule.
136 * SMK_CIPSOMIN: Minimum possible cipso rule length.
137 * SMK_CIPSOMAX: Maximum possible cipso rule length.
139 #define SMK_DIGITLEN 4
140 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
141 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
144 * Values for parsing MAC rules
145 * SMK_ACCESS: Maximum possible combination of access permissions
146 * SMK_ACCESSLEN: Maximum length for a rule access field
147 * SMK_LOADLEN: Smack rule length
149 #define SMK_OACCESS "rwxa"
150 #define SMK_ACCESS "rwxatl"
151 #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
152 #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
153 #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
154 #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
157 * Stricly for CIPSO level manipulation.
158 * Set the category bit number in a smack label sized buffer.
160 static inline void smack_catset_bit(unsigned int cat
, char *catsetp
)
162 if (cat
== 0 || cat
> (SMK_CIPSOLEN
* 8))
165 catsetp
[(cat
- 1) / 8] |= 0x80 >> ((cat
- 1) % 8);
169 * smk_netlabel_audit_set - fill a netlbl_audit struct
170 * @nap: structure to fill
172 static void smk_netlabel_audit_set(struct netlbl_audit
*nap
)
174 struct smack_known
*skp
= smk_of_current();
176 nap
->loginuid
= audit_get_loginuid(current
);
177 nap
->sessionid
= audit_get_sessionid(current
);
178 nap
->secid
= skp
->smk_secid
;
182 * Value for parsing single label host rules
185 #define SMK_NETLBLADDRMIN 9
188 * smk_set_access - add a rule to the rule list or replace an old rule
189 * @srp: the rule to add or replace
190 * @rule_list: the list of rules
191 * @rule_lock: the rule list lock
192 * @global: if non-zero, indicates a global rule
194 * Looks through the current subject/object/access list for
195 * the subject/object pair and replaces the access that was
196 * there. If the pair isn't found add it with the specified
199 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
200 * during the allocation of the new pair to add.
202 static int smk_set_access(struct smack_parsed_rule
*srp
,
203 struct list_head
*rule_list
,
204 struct mutex
*rule_lock
, int global
)
206 struct smack_rule
*sp
;
207 struct smack_master_list
*smlp
;
211 mutex_lock(rule_lock
);
214 * Because the object label is less likely to match
215 * than the subject label check it first
217 list_for_each_entry_rcu(sp
, rule_list
, list
) {
218 if (sp
->smk_object
== srp
->smk_object
&&
219 sp
->smk_subject
== srp
->smk_subject
) {
221 sp
->smk_access
|= srp
->smk_access1
;
222 sp
->smk_access
&= ~srp
->smk_access2
;
228 sp
= kzalloc(sizeof(*sp
), GFP_KERNEL
);
234 sp
->smk_subject
= srp
->smk_subject
;
235 sp
->smk_object
= srp
->smk_object
;
236 sp
->smk_access
= srp
->smk_access1
& ~srp
->smk_access2
;
238 list_add_rcu(&sp
->list
, rule_list
);
240 * If this is a global as opposed to self and a new rule
241 * it needs to get added for reporting.
244 smlp
= kzalloc(sizeof(*smlp
), GFP_KERNEL
);
247 list_add_rcu(&smlp
->list
, &smack_rule_list
);
254 mutex_unlock(rule_lock
);
259 * smk_perm_from_str - parse smack accesses from a text string
260 * @string: a text string that contains a Smack accesses code
262 * Returns an integer with respective bits set for specified accesses.
264 static int smk_perm_from_str(const char *string
)
269 for (cp
= string
; ; cp
++)
291 perm
|= MAY_TRANSMUTE
;
303 * smk_fill_rule - Fill Smack rule from strings
304 * @subject: subject label string
305 * @object: object label string
306 * @access1: access string
307 * @access2: string with permissions to be removed
309 * @import: if non-zero, import labels
310 * @len: label length limit
312 * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject
313 * or object is missing.
315 static int smk_fill_rule(const char *subject
, const char *object
,
316 const char *access1
, const char *access2
,
317 struct smack_parsed_rule
*rule
, int import
,
321 struct smack_known
*skp
;
324 rule
->smk_subject
= smk_import_entry(subject
, len
);
325 if (rule
->smk_subject
== NULL
)
328 rule
->smk_object
= smk_import(object
, len
);
329 if (rule
->smk_object
== NULL
)
332 cp
= smk_parse_smack(subject
, len
);
335 skp
= smk_find_entry(cp
);
339 rule
->smk_subject
= skp
;
341 cp
= smk_parse_smack(object
, len
);
344 skp
= smk_find_entry(cp
);
348 rule
->smk_object
= skp
->smk_known
;
351 rule
->smk_access1
= smk_perm_from_str(access1
);
353 rule
->smk_access2
= smk_perm_from_str(access2
);
355 rule
->smk_access2
= ~rule
->smk_access1
;
361 * smk_parse_rule - parse Smack rule from load string
362 * @data: string to be parsed whose size is SMK_LOADLEN
364 * @import: if non-zero, import labels
366 * Returns 0 on success, -1 on errors.
368 static int smk_parse_rule(const char *data
, struct smack_parsed_rule
*rule
,
373 rc
= smk_fill_rule(data
, data
+ SMK_LABELLEN
,
374 data
+ SMK_LABELLEN
+ SMK_LABELLEN
, NULL
, rule
,
375 import
, SMK_LABELLEN
);
380 * smk_parse_long_rule - parse Smack rule from rule string
381 * @data: string to be parsed, null terminated
382 * @rule: Will be filled with Smack parsed rule
383 * @import: if non-zero, import labels
384 * @tokens: numer of substrings expected in data
386 * Returns number of processed bytes on success, -1 on failure.
388 static ssize_t
smk_parse_long_rule(char *data
, struct smack_parsed_rule
*rule
,
389 int import
, int tokens
)
397 * Parsing the rule in-place, filling all white-spaces with '\0'
399 for (i
= 0; i
< tokens
; ++i
) {
400 while (isspace(data
[cnt
]))
403 if (data
[cnt
] == '\0')
404 /* Unexpected end of data */
409 while (data
[cnt
] && !isspace(data
[cnt
]))
412 while (isspace(data
[cnt
]))
418 rc
= smk_fill_rule(tok
[0], tok
[1], tok
[2], tok
[3], rule
, import
, 0);
419 return rc
== 0 ? cnt
: rc
;
422 #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
423 #define SMK_LONG_FMT 1 /* Variable long label format */
424 #define SMK_CHANGE_FMT 2 /* Rule modification format */
426 * smk_write_rules_list - write() for any /smack rule file
427 * @file: file pointer, not actually used
428 * @buf: where to get the data from
430 * @ppos: where to start - must be 0
431 * @rule_list: the list of rules to write to
432 * @rule_lock: lock for the rule list
433 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
435 * Get one smack access rule from above.
436 * The format for SMK_LONG_FMT is:
437 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
438 * The format for SMK_FIXED24_FMT is exactly:
439 * "subject object rwxat"
440 * The format for SMK_CHANGE_FMT is:
441 * "subject<whitespace>object<whitespace>
442 * acc_enable<whitespace>acc_disable[<whitespace>...]"
444 static ssize_t
smk_write_rules_list(struct file
*file
, const char __user
*buf
,
445 size_t count
, loff_t
*ppos
,
446 struct list_head
*rule_list
,
447 struct mutex
*rule_lock
, int format
)
449 struct smack_parsed_rule rule
;
458 * Enough data must be present.
463 if (format
== SMK_FIXED24_FMT
) {
465 * Minor hack for backward compatibility
467 if (count
< SMK_OLOADLEN
|| count
> SMK_LOADLEN
)
470 if (count
>= PAGE_SIZE
) {
471 count
= PAGE_SIZE
- 1;
476 data
= kmalloc(count
+ 1, GFP_KERNEL
);
480 if (copy_from_user(data
, buf
, count
) != 0) {
486 * In case of parsing only part of user buf,
487 * avoid having partial rule at the data buffer
490 while (count
> 0 && (data
[count
- 1] != '\n'))
499 tokens
= (format
== SMK_CHANGE_FMT
? 4 : 3);
500 while (cnt
< count
) {
501 if (format
== SMK_FIXED24_FMT
) {
502 rc
= smk_parse_rule(data
, &rule
, 1);
509 rc
= smk_parse_long_rule(data
+ cnt
, &rule
, 1, tokens
);
517 if (rule_list
== NULL
)
518 rc
= smk_set_access(&rule
, &rule
.smk_subject
->smk_rules
,
519 &rule
.smk_subject
->smk_rules_lock
, 1);
521 rc
= smk_set_access(&rule
, rule_list
, rule_lock
, 0);
534 * Core logic for smackfs seq list operations.
537 static void *smk_seq_start(struct seq_file
*s
, loff_t
*pos
,
538 struct list_head
*head
)
540 struct list_head
*list
;
543 * This is 0 the first time through.
548 if (s
->private == NULL
)
552 if (list_empty(list
))
560 static void *smk_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
,
561 struct list_head
*head
)
563 struct list_head
*list
= v
;
565 if (list_is_last(list
, head
)) {
569 s
->private = list
->next
;
573 static void smk_seq_stop(struct seq_file
*s
, void *v
)
578 static void smk_rule_show(struct seq_file
*s
, struct smack_rule
*srp
, int max
)
581 * Don't show any rules with label names too long for
582 * interface file (/smack/load or /smack/load2)
583 * because you should expect to be able to write
584 * anything you read back.
586 if (strlen(srp
->smk_subject
->smk_known
) >= max
||
587 strlen(srp
->smk_object
) >= max
)
590 if (srp
->smk_access
== 0)
593 seq_printf(s
, "%s %s", srp
->smk_subject
->smk_known
, srp
->smk_object
);
597 if (srp
->smk_access
& MAY_READ
)
599 if (srp
->smk_access
& MAY_WRITE
)
601 if (srp
->smk_access
& MAY_EXEC
)
603 if (srp
->smk_access
& MAY_APPEND
)
605 if (srp
->smk_access
& MAY_TRANSMUTE
)
607 if (srp
->smk_access
& MAY_LOCK
)
614 * Seq_file read operations for /smack/load
617 static void *load2_seq_start(struct seq_file
*s
, loff_t
*pos
)
619 return smk_seq_start(s
, pos
, &smack_rule_list
);
622 static void *load2_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
624 return smk_seq_next(s
, v
, pos
, &smack_rule_list
);
627 static int load_seq_show(struct seq_file
*s
, void *v
)
629 struct list_head
*list
= v
;
630 struct smack_master_list
*smlp
=
631 list_entry(list
, struct smack_master_list
, list
);
633 smk_rule_show(s
, smlp
->smk_rule
, SMK_LABELLEN
);
638 static const struct seq_operations load_seq_ops
= {
639 .start
= load2_seq_start
,
640 .next
= load2_seq_next
,
641 .show
= load_seq_show
,
642 .stop
= smk_seq_stop
,
646 * smk_open_load - open() for /smack/load
647 * @inode: inode structure representing file
648 * @file: "load" file pointer
650 * For reading, use load_seq_* seq_file reading operations.
652 static int smk_open_load(struct inode
*inode
, struct file
*file
)
654 return seq_open(file
, &load_seq_ops
);
658 * smk_write_load - write() for /smack/load
659 * @file: file pointer, not actually used
660 * @buf: where to get the data from
662 * @ppos: where to start - must be 0
665 static ssize_t
smk_write_load(struct file
*file
, const char __user
*buf
,
666 size_t count
, loff_t
*ppos
)
669 * Must have privilege.
671 * Enough data must be present.
673 if (!smack_privileged(CAP_MAC_ADMIN
))
676 return smk_write_rules_list(file
, buf
, count
, ppos
, NULL
, NULL
,
680 static const struct file_operations smk_load_ops
= {
681 .open
= smk_open_load
,
684 .write
= smk_write_load
,
685 .release
= seq_release
,
689 * smk_cipso_doi - initialize the CIPSO domain
691 static void smk_cipso_doi(void)
694 struct cipso_v4_doi
*doip
;
695 struct netlbl_audit nai
;
697 smk_netlabel_audit_set(&nai
);
699 rc
= netlbl_cfg_map_del(NULL
, PF_INET
, NULL
, NULL
, &nai
);
701 printk(KERN_WARNING
"%s:%d remove rc = %d\n",
702 __func__
, __LINE__
, rc
);
704 doip
= kmalloc(sizeof(struct cipso_v4_doi
), GFP_KERNEL
);
706 panic("smack: Failed to initialize cipso DOI.\n");
707 doip
->map
.std
= NULL
;
708 doip
->doi
= smk_cipso_doi_value
;
709 doip
->type
= CIPSO_V4_MAP_PASS
;
710 doip
->tags
[0] = CIPSO_V4_TAG_RBITMAP
;
711 for (rc
= 1; rc
< CIPSO_V4_TAG_MAXCNT
; rc
++)
712 doip
->tags
[rc
] = CIPSO_V4_TAG_INVALID
;
714 rc
= netlbl_cfg_cipsov4_add(doip
, &nai
);
716 printk(KERN_WARNING
"%s:%d cipso add rc = %d\n",
717 __func__
, __LINE__
, rc
);
721 rc
= netlbl_cfg_cipsov4_map_add(doip
->doi
, NULL
, NULL
, NULL
, &nai
);
723 printk(KERN_WARNING
"%s:%d map add rc = %d\n",
724 __func__
, __LINE__
, rc
);
731 * smk_unlbl_ambient - initialize the unlabeled domain
732 * @oldambient: previous domain string
734 static void smk_unlbl_ambient(char *oldambient
)
737 struct netlbl_audit nai
;
739 smk_netlabel_audit_set(&nai
);
741 if (oldambient
!= NULL
) {
742 rc
= netlbl_cfg_map_del(oldambient
, PF_INET
, NULL
, NULL
, &nai
);
744 printk(KERN_WARNING
"%s:%d remove rc = %d\n",
745 __func__
, __LINE__
, rc
);
747 if (smack_net_ambient
== NULL
)
748 smack_net_ambient
= &smack_known_floor
;
750 rc
= netlbl_cfg_unlbl_map_add(smack_net_ambient
->smk_known
, PF_INET
,
753 printk(KERN_WARNING
"%s:%d add rc = %d\n",
754 __func__
, __LINE__
, rc
);
758 * Seq_file read operations for /smack/cipso
761 static void *cipso_seq_start(struct seq_file
*s
, loff_t
*pos
)
763 return smk_seq_start(s
, pos
, &smack_known_list
);
766 static void *cipso_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
768 return smk_seq_next(s
, v
, pos
, &smack_known_list
);
772 * Print cipso labels in format:
773 * label level[/cat[,cat]]
775 static int cipso_seq_show(struct seq_file
*s
, void *v
)
777 struct list_head
*list
= v
;
778 struct smack_known
*skp
=
779 list_entry(list
, struct smack_known
, list
);
780 struct netlbl_lsm_secattr_catmap
*cmp
= skp
->smk_netlabel
.attr
.mls
.cat
;
785 * Don't show a label that could not have been set using
786 * /smack/cipso. This is in support of the notion that
787 * anything read from /smack/cipso ought to be writeable
790 * /smack/cipso2 should be used instead.
792 if (strlen(skp
->smk_known
) >= SMK_LABELLEN
)
795 seq_printf(s
, "%s %3d", skp
->smk_known
, skp
->smk_netlabel
.attr
.mls
.lvl
);
797 for (i
= netlbl_secattr_catmap_walk(cmp
, 0); i
>= 0;
798 i
= netlbl_secattr_catmap_walk(cmp
, i
+ 1)) {
799 seq_printf(s
, "%c%d", sep
, i
);
808 static const struct seq_operations cipso_seq_ops
= {
809 .start
= cipso_seq_start
,
810 .next
= cipso_seq_next
,
811 .show
= cipso_seq_show
,
812 .stop
= smk_seq_stop
,
816 * smk_open_cipso - open() for /smack/cipso
817 * @inode: inode structure representing file
818 * @file: "cipso" file pointer
820 * Connect our cipso_seq_* operations with /smack/cipso
823 static int smk_open_cipso(struct inode
*inode
, struct file
*file
)
825 return seq_open(file
, &cipso_seq_ops
);
829 * smk_set_cipso - do the work for write() for cipso and cipso2
830 * @file: file pointer, not actually used
831 * @buf: where to get the data from
833 * @ppos: where to start
834 * @format: /smack/cipso or /smack/cipso2
836 * Accepts only one cipso rule per write call.
837 * Returns number of bytes written or error code, as appropriate
839 static ssize_t
smk_set_cipso(struct file
*file
, const char __user
*buf
,
840 size_t count
, loff_t
*ppos
, int format
)
842 struct smack_known
*skp
;
843 struct netlbl_lsm_secattr ncats
;
844 char mapcatset
[SMK_CIPSOLEN
];
848 ssize_t rc
= -EINVAL
;
855 * Must have privilege.
857 * Enough data must be present.
859 if (!smack_privileged(CAP_MAC_ADMIN
))
863 if (format
== SMK_FIXED24_FMT
&&
864 (count
< SMK_CIPSOMIN
|| count
> SMK_CIPSOMAX
))
867 data
= kzalloc(count
+ 1, GFP_KERNEL
);
871 if (copy_from_user(data
, buf
, count
) != 0) {
879 * Only allow one writer at a time. Writes should be
880 * quite rare and small in any case.
882 mutex_lock(&smack_cipso_lock
);
884 skp
= smk_import_entry(rule
, 0);
888 if (format
== SMK_FIXED24_FMT
)
889 rule
+= SMK_LABELLEN
;
891 rule
+= strlen(skp
->smk_known
) + 1;
893 ret
= sscanf(rule
, "%d", &maplevel
);
894 if (ret
!= 1 || maplevel
> SMACK_CIPSO_MAXLEVEL
)
897 rule
+= SMK_DIGITLEN
;
898 ret
= sscanf(rule
, "%d", &catlen
);
899 if (ret
!= 1 || catlen
> SMACK_CIPSO_MAXCATNUM
)
902 if (format
== SMK_FIXED24_FMT
&&
903 count
!= (SMK_CIPSOMIN
+ catlen
* SMK_DIGITLEN
))
906 memset(mapcatset
, 0, sizeof(mapcatset
));
908 for (i
= 0; i
< catlen
; i
++) {
909 rule
+= SMK_DIGITLEN
;
910 ret
= sscanf(rule
, "%u", &cat
);
911 if (ret
!= 1 || cat
> SMACK_CIPSO_MAXCATNUM
)
914 smack_catset_bit(cat
, mapcatset
);
917 rc
= smk_netlbl_mls(maplevel
, mapcatset
, &ncats
, SMK_CIPSOLEN
);
919 netlbl_secattr_catmap_free(skp
->smk_netlabel
.attr
.mls
.cat
);
920 skp
->smk_netlabel
.attr
.mls
.cat
= ncats
.attr
.mls
.cat
;
921 skp
->smk_netlabel
.attr
.mls
.lvl
= ncats
.attr
.mls
.lvl
;
926 mutex_unlock(&smack_cipso_lock
);
933 * smk_write_cipso - write() for /smack/cipso
934 * @file: file pointer, not actually used
935 * @buf: where to get the data from
937 * @ppos: where to start
939 * Accepts only one cipso rule per write call.
940 * Returns number of bytes written or error code, as appropriate
942 static ssize_t
smk_write_cipso(struct file
*file
, const char __user
*buf
,
943 size_t count
, loff_t
*ppos
)
945 return smk_set_cipso(file
, buf
, count
, ppos
, SMK_FIXED24_FMT
);
948 static const struct file_operations smk_cipso_ops
= {
949 .open
= smk_open_cipso
,
952 .write
= smk_write_cipso
,
953 .release
= seq_release
,
957 * Seq_file read operations for /smack/cipso2
961 * Print cipso labels in format:
962 * label level[/cat[,cat]]
964 static int cipso2_seq_show(struct seq_file
*s
, void *v
)
966 struct list_head
*list
= v
;
967 struct smack_known
*skp
=
968 list_entry(list
, struct smack_known
, list
);
969 struct netlbl_lsm_secattr_catmap
*cmp
= skp
->smk_netlabel
.attr
.mls
.cat
;
973 seq_printf(s
, "%s %3d", skp
->smk_known
, skp
->smk_netlabel
.attr
.mls
.lvl
);
975 for (i
= netlbl_secattr_catmap_walk(cmp
, 0); i
>= 0;
976 i
= netlbl_secattr_catmap_walk(cmp
, i
+ 1)) {
977 seq_printf(s
, "%c%d", sep
, i
);
986 static const struct seq_operations cipso2_seq_ops
= {
987 .start
= cipso_seq_start
,
988 .next
= cipso_seq_next
,
989 .show
= cipso2_seq_show
,
990 .stop
= smk_seq_stop
,
994 * smk_open_cipso2 - open() for /smack/cipso2
995 * @inode: inode structure representing file
996 * @file: "cipso2" file pointer
998 * Connect our cipso_seq_* operations with /smack/cipso2
1001 static int smk_open_cipso2(struct inode
*inode
, struct file
*file
)
1003 return seq_open(file
, &cipso2_seq_ops
);
1007 * smk_write_cipso2 - write() for /smack/cipso2
1008 * @file: file pointer, not actually used
1009 * @buf: where to get the data from
1010 * @count: bytes sent
1011 * @ppos: where to start
1013 * Accepts only one cipso rule per write call.
1014 * Returns number of bytes written or error code, as appropriate
1016 static ssize_t
smk_write_cipso2(struct file
*file
, const char __user
*buf
,
1017 size_t count
, loff_t
*ppos
)
1019 return smk_set_cipso(file
, buf
, count
, ppos
, SMK_LONG_FMT
);
1022 static const struct file_operations smk_cipso2_ops
= {
1023 .open
= smk_open_cipso2
,
1025 .llseek
= seq_lseek
,
1026 .write
= smk_write_cipso2
,
1027 .release
= seq_release
,
1031 * Seq_file read operations for /smack/netlabel
1034 static void *netlbladdr_seq_start(struct seq_file
*s
, loff_t
*pos
)
1036 return smk_seq_start(s
, pos
, &smk_netlbladdr_list
);
1039 static void *netlbladdr_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
1041 return smk_seq_next(s
, v
, pos
, &smk_netlbladdr_list
);
1043 #define BEBITS (sizeof(__be32) * 8)
1046 * Print host/label pairs
1048 static int netlbladdr_seq_show(struct seq_file
*s
, void *v
)
1050 struct list_head
*list
= v
;
1051 struct smk_netlbladdr
*skp
=
1052 list_entry(list
, struct smk_netlbladdr
, list
);
1053 unsigned char *hp
= (char *) &skp
->smk_host
.sin_addr
.s_addr
;
1055 u32 temp_mask
= be32_to_cpu(skp
->smk_mask
.s_addr
);
1057 for (maskn
= 0; temp_mask
; temp_mask
<<= 1, maskn
++);
1059 seq_printf(s
, "%u.%u.%u.%u/%d %s\n",
1060 hp
[0], hp
[1], hp
[2], hp
[3], maskn
, skp
->smk_label
);
1065 static const struct seq_operations netlbladdr_seq_ops
= {
1066 .start
= netlbladdr_seq_start
,
1067 .next
= netlbladdr_seq_next
,
1068 .show
= netlbladdr_seq_show
,
1069 .stop
= smk_seq_stop
,
1073 * smk_open_netlbladdr - open() for /smack/netlabel
1074 * @inode: inode structure representing file
1075 * @file: "netlabel" file pointer
1077 * Connect our netlbladdr_seq_* operations with /smack/netlabel
1080 static int smk_open_netlbladdr(struct inode
*inode
, struct file
*file
)
1082 return seq_open(file
, &netlbladdr_seq_ops
);
1086 * smk_netlbladdr_insert
1087 * @new : netlabel to insert
1089 * This helper insert netlabel in the smack_netlbladdrs list
1090 * sorted by netmask length (longest to smallest)
1091 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
1094 static void smk_netlbladdr_insert(struct smk_netlbladdr
*new)
1096 struct smk_netlbladdr
*m
, *m_next
;
1098 if (list_empty(&smk_netlbladdr_list
)) {
1099 list_add_rcu(&new->list
, &smk_netlbladdr_list
);
1103 m
= list_entry_rcu(smk_netlbladdr_list
.next
,
1104 struct smk_netlbladdr
, list
);
1106 /* the comparison '>' is a bit hacky, but works */
1107 if (new->smk_mask
.s_addr
> m
->smk_mask
.s_addr
) {
1108 list_add_rcu(&new->list
, &smk_netlbladdr_list
);
1112 list_for_each_entry_rcu(m
, &smk_netlbladdr_list
, list
) {
1113 if (list_is_last(&m
->list
, &smk_netlbladdr_list
)) {
1114 list_add_rcu(&new->list
, &m
->list
);
1117 m_next
= list_entry_rcu(m
->list
.next
,
1118 struct smk_netlbladdr
, list
);
1119 if (new->smk_mask
.s_addr
> m_next
->smk_mask
.s_addr
) {
1120 list_add_rcu(&new->list
, &m
->list
);
1128 * smk_write_netlbladdr - write() for /smack/netlabel
1129 * @file: file pointer, not actually used
1130 * @buf: where to get the data from
1131 * @count: bytes sent
1132 * @ppos: where to start
1134 * Accepts only one netlbladdr per write call.
1135 * Returns number of bytes written or error code, as appropriate
1137 static ssize_t
smk_write_netlbladdr(struct file
*file
, const char __user
*buf
,
1138 size_t count
, loff_t
*ppos
)
1140 struct smk_netlbladdr
*skp
;
1141 struct sockaddr_in newname
;
1145 char *host
= (char *)&newname
.sin_addr
.s_addr
;
1147 struct netlbl_audit audit_info
;
1148 struct in_addr mask
;
1151 u32 mask_bits
= (1<<31);
1156 * Must have privilege.
1157 * No partial writes.
1158 * Enough data must be present.
1159 * "<addr/mask, as a.b.c.d/e><space><label>"
1160 * "<addr, as a.b.c.d><space><label>"
1162 if (!smack_privileged(CAP_MAC_ADMIN
))
1166 if (count
< SMK_NETLBLADDRMIN
)
1169 data
= kzalloc(count
+ 1, GFP_KERNEL
);
1173 if (copy_from_user(data
, buf
, count
) != 0) {
1178 smack
= kzalloc(count
+ 1, GFP_KERNEL
);
1179 if (smack
== NULL
) {
1186 rc
= sscanf(data
, "%hhd.%hhd.%hhd.%hhd/%d %s",
1187 &host
[0], &host
[1], &host
[2], &host
[3], &m
, smack
);
1189 rc
= sscanf(data
, "%hhd.%hhd.%hhd.%hhd %s",
1190 &host
[0], &host
[1], &host
[2], &host
[3], smack
);
1203 * If smack begins with '-', it is an option, don't import it
1205 if (smack
[0] != '-') {
1206 sp
= smk_import(smack
, 0);
1212 /* check known options */
1213 if (strcmp(smack
, smack_cipso_option
) == 0)
1214 sp
= (char *)smack_cipso_option
;
1221 for (temp_mask
= 0; m
> 0; m
--) {
1222 temp_mask
|= mask_bits
;
1225 mask
.s_addr
= cpu_to_be32(temp_mask
);
1227 newname
.sin_addr
.s_addr
&= mask
.s_addr
;
1229 * Only allow one writer at a time. Writes should be
1230 * quite rare and small in any case.
1232 mutex_lock(&smk_netlbladdr_lock
);
1234 nsa
= newname
.sin_addr
.s_addr
;
1235 /* try to find if the prefix is already in the list */
1237 list_for_each_entry_rcu(skp
, &smk_netlbladdr_list
, list
) {
1238 if (skp
->smk_host
.sin_addr
.s_addr
== nsa
&&
1239 skp
->smk_mask
.s_addr
== mask
.s_addr
) {
1244 smk_netlabel_audit_set(&audit_info
);
1247 skp
= kzalloc(sizeof(*skp
), GFP_KERNEL
);
1252 skp
->smk_host
.sin_addr
.s_addr
= newname
.sin_addr
.s_addr
;
1253 skp
->smk_mask
.s_addr
= mask
.s_addr
;
1254 skp
->smk_label
= sp
;
1255 smk_netlbladdr_insert(skp
);
1258 /* we delete the unlabeled entry, only if the previous label
1259 * wasn't the special CIPSO option */
1260 if (skp
->smk_label
!= smack_cipso_option
)
1261 rc
= netlbl_cfg_unlbl_static_del(&init_net
, NULL
,
1262 &skp
->smk_host
.sin_addr
, &skp
->smk_mask
,
1263 PF_INET
, &audit_info
);
1266 skp
->smk_label
= sp
;
1270 * Now tell netlabel about the single label nature of
1271 * this host so that incoming packets get labeled.
1272 * but only if we didn't get the special CIPSO option
1274 if (rc
== 0 && sp
!= smack_cipso_option
)
1275 rc
= netlbl_cfg_unlbl_static_add(&init_net
, NULL
,
1276 &skp
->smk_host
.sin_addr
, &skp
->smk_mask
, PF_INET
,
1277 smack_to_secid(skp
->smk_label
), &audit_info
);
1282 mutex_unlock(&smk_netlbladdr_lock
);
1292 static const struct file_operations smk_netlbladdr_ops
= {
1293 .open
= smk_open_netlbladdr
,
1295 .llseek
= seq_lseek
,
1296 .write
= smk_write_netlbladdr
,
1297 .release
= seq_release
,
1301 * smk_read_doi - read() for /smack/doi
1302 * @filp: file pointer, not actually used
1303 * @buf: where to put the result
1304 * @count: maximum to send along
1305 * @ppos: where to start
1307 * Returns number of bytes read or error code, as appropriate
1309 static ssize_t
smk_read_doi(struct file
*filp
, char __user
*buf
,
1310 size_t count
, loff_t
*ppos
)
1318 sprintf(temp
, "%d", smk_cipso_doi_value
);
1319 rc
= simple_read_from_buffer(buf
, count
, ppos
, temp
, strlen(temp
));
1325 * smk_write_doi - write() for /smack/doi
1326 * @file: file pointer, not actually used
1327 * @buf: where to get the data from
1328 * @count: bytes sent
1329 * @ppos: where to start
1331 * Returns number of bytes written or error code, as appropriate
1333 static ssize_t
smk_write_doi(struct file
*file
, const char __user
*buf
,
1334 size_t count
, loff_t
*ppos
)
1339 if (!smack_privileged(CAP_MAC_ADMIN
))
1342 if (count
>= sizeof(temp
) || count
== 0)
1345 if (copy_from_user(temp
, buf
, count
) != 0)
1350 if (sscanf(temp
, "%d", &i
) != 1)
1353 smk_cipso_doi_value
= i
;
1360 static const struct file_operations smk_doi_ops
= {
1361 .read
= smk_read_doi
,
1362 .write
= smk_write_doi
,
1363 .llseek
= default_llseek
,
1367 * smk_read_direct - read() for /smack/direct
1368 * @filp: file pointer, not actually used
1369 * @buf: where to put the result
1370 * @count: maximum to send along
1371 * @ppos: where to start
1373 * Returns number of bytes read or error code, as appropriate
1375 static ssize_t
smk_read_direct(struct file
*filp
, char __user
*buf
,
1376 size_t count
, loff_t
*ppos
)
1384 sprintf(temp
, "%d", smack_cipso_direct
);
1385 rc
= simple_read_from_buffer(buf
, count
, ppos
, temp
, strlen(temp
));
1391 * smk_write_direct - write() for /smack/direct
1392 * @file: file pointer, not actually used
1393 * @buf: where to get the data from
1394 * @count: bytes sent
1395 * @ppos: where to start
1397 * Returns number of bytes written or error code, as appropriate
1399 static ssize_t
smk_write_direct(struct file
*file
, const char __user
*buf
,
1400 size_t count
, loff_t
*ppos
)
1402 struct smack_known
*skp
;
1406 if (!smack_privileged(CAP_MAC_ADMIN
))
1409 if (count
>= sizeof(temp
) || count
== 0)
1412 if (copy_from_user(temp
, buf
, count
) != 0)
1417 if (sscanf(temp
, "%d", &i
) != 1)
1421 * Don't do anything if the value hasn't actually changed.
1422 * If it is changing reset the level on entries that were
1423 * set up to be direct when they were created.
1425 if (smack_cipso_direct
!= i
) {
1426 mutex_lock(&smack_known_lock
);
1427 list_for_each_entry_rcu(skp
, &smack_known_list
, list
)
1428 if (skp
->smk_netlabel
.attr
.mls
.lvl
==
1430 skp
->smk_netlabel
.attr
.mls
.lvl
= i
;
1431 smack_cipso_direct
= i
;
1432 mutex_unlock(&smack_known_lock
);
1438 static const struct file_operations smk_direct_ops
= {
1439 .read
= smk_read_direct
,
1440 .write
= smk_write_direct
,
1441 .llseek
= default_llseek
,
1445 * smk_read_mapped - read() for /smack/mapped
1446 * @filp: file pointer, not actually used
1447 * @buf: where to put the result
1448 * @count: maximum to send along
1449 * @ppos: where to start
1451 * Returns number of bytes read or error code, as appropriate
1453 static ssize_t
smk_read_mapped(struct file
*filp
, char __user
*buf
,
1454 size_t count
, loff_t
*ppos
)
1462 sprintf(temp
, "%d", smack_cipso_mapped
);
1463 rc
= simple_read_from_buffer(buf
, count
, ppos
, temp
, strlen(temp
));
1469 * smk_write_mapped - write() for /smack/mapped
1470 * @file: file pointer, not actually used
1471 * @buf: where to get the data from
1472 * @count: bytes sent
1473 * @ppos: where to start
1475 * Returns number of bytes written or error code, as appropriate
1477 static ssize_t
smk_write_mapped(struct file
*file
, const char __user
*buf
,
1478 size_t count
, loff_t
*ppos
)
1480 struct smack_known
*skp
;
1484 if (!smack_privileged(CAP_MAC_ADMIN
))
1487 if (count
>= sizeof(temp
) || count
== 0)
1490 if (copy_from_user(temp
, buf
, count
) != 0)
1495 if (sscanf(temp
, "%d", &i
) != 1)
1499 * Don't do anything if the value hasn't actually changed.
1500 * If it is changing reset the level on entries that were
1501 * set up to be mapped when they were created.
1503 if (smack_cipso_mapped
!= i
) {
1504 mutex_lock(&smack_known_lock
);
1505 list_for_each_entry_rcu(skp
, &smack_known_list
, list
)
1506 if (skp
->smk_netlabel
.attr
.mls
.lvl
==
1508 skp
->smk_netlabel
.attr
.mls
.lvl
= i
;
1509 smack_cipso_mapped
= i
;
1510 mutex_unlock(&smack_known_lock
);
1516 static const struct file_operations smk_mapped_ops
= {
1517 .read
= smk_read_mapped
,
1518 .write
= smk_write_mapped
,
1519 .llseek
= default_llseek
,
1523 * smk_read_ambient - read() for /smack/ambient
1524 * @filp: file pointer, not actually used
1525 * @buf: where to put the result
1526 * @cn: maximum to send along
1527 * @ppos: where to start
1529 * Returns number of bytes read or error code, as appropriate
1531 static ssize_t
smk_read_ambient(struct file
*filp
, char __user
*buf
,
1532 size_t cn
, loff_t
*ppos
)
1540 * Being careful to avoid a problem in the case where
1541 * smack_net_ambient gets changed in midstream.
1543 mutex_lock(&smack_ambient_lock
);
1545 asize
= strlen(smack_net_ambient
->smk_known
) + 1;
1548 rc
= simple_read_from_buffer(buf
, cn
, ppos
,
1549 smack_net_ambient
->smk_known
,
1554 mutex_unlock(&smack_ambient_lock
);
1560 * smk_write_ambient - write() for /smack/ambient
1561 * @file: file pointer, not actually used
1562 * @buf: where to get the data from
1563 * @count: bytes sent
1564 * @ppos: where to start
1566 * Returns number of bytes written or error code, as appropriate
1568 static ssize_t
smk_write_ambient(struct file
*file
, const char __user
*buf
,
1569 size_t count
, loff_t
*ppos
)
1571 struct smack_known
*skp
;
1576 if (!smack_privileged(CAP_MAC_ADMIN
))
1579 data
= kzalloc(count
+ 1, GFP_KERNEL
);
1583 if (copy_from_user(data
, buf
, count
) != 0) {
1588 skp
= smk_import_entry(data
, count
);
1594 mutex_lock(&smack_ambient_lock
);
1596 oldambient
= smack_net_ambient
->smk_known
;
1597 smack_net_ambient
= skp
;
1598 smk_unlbl_ambient(oldambient
);
1600 mutex_unlock(&smack_ambient_lock
);
1607 static const struct file_operations smk_ambient_ops
= {
1608 .read
= smk_read_ambient
,
1609 .write
= smk_write_ambient
,
1610 .llseek
= default_llseek
,
1614 * smk_read_onlycap - read() for smackfs/onlycap
1615 * @filp: file pointer, not actually used
1616 * @buf: where to put the result
1617 * @cn: maximum to send along
1618 * @ppos: where to start
1620 * Returns number of bytes read or error code, as appropriate
1622 static ssize_t
smk_read_onlycap(struct file
*filp
, char __user
*buf
,
1623 size_t cn
, loff_t
*ppos
)
1626 ssize_t rc
= -EINVAL
;
1632 if (smack_onlycap
!= NULL
)
1633 smack
= smack_onlycap
->smk_known
;
1635 asize
= strlen(smack
) + 1;
1638 rc
= simple_read_from_buffer(buf
, cn
, ppos
, smack
, asize
);
1644 * smk_write_onlycap - write() for smackfs/onlycap
1645 * @file: file pointer, not actually used
1646 * @buf: where to get the data from
1647 * @count: bytes sent
1648 * @ppos: where to start
1650 * Returns number of bytes written or error code, as appropriate
1652 static ssize_t
smk_write_onlycap(struct file
*file
, const char __user
*buf
,
1653 size_t count
, loff_t
*ppos
)
1656 struct smack_known
*skp
= smk_of_task(current
->cred
->security
);
1659 if (!smack_privileged(CAP_MAC_ADMIN
))
1663 * This can be done using smk_access() but is done
1664 * explicitly for clarity. The smk_access() implementation
1665 * would use smk_access(smack_onlycap, MAY_WRITE)
1667 if (smack_onlycap
!= NULL
&& smack_onlycap
!= skp
)
1670 data
= kzalloc(count
, GFP_KERNEL
);
1675 * Should the null string be passed in unset the onlycap value.
1676 * This seems like something to be careful with as usually
1677 * smk_import only expects to return NULL for errors. It
1678 * is usually the case that a nullstring or "\n" would be
1679 * bad to pass to smk_import but in fact this is useful here.
1681 * smk_import will also reject a label beginning with '-',
1682 * so "-usecapabilities" will also work.
1684 if (copy_from_user(data
, buf
, count
) != 0)
1687 smack_onlycap
= smk_import_entry(data
, count
);
1693 static const struct file_operations smk_onlycap_ops
= {
1694 .read
= smk_read_onlycap
,
1695 .write
= smk_write_onlycap
,
1696 .llseek
= default_llseek
,
1700 * smk_read_logging - read() for /smack/logging
1701 * @filp: file pointer, not actually used
1702 * @buf: where to put the result
1703 * @cn: maximum to send along
1704 * @ppos: where to start
1706 * Returns number of bytes read or error code, as appropriate
1708 static ssize_t
smk_read_logging(struct file
*filp
, char __user
*buf
,
1709 size_t count
, loff_t
*ppos
)
1717 sprintf(temp
, "%d\n", log_policy
);
1718 rc
= simple_read_from_buffer(buf
, count
, ppos
, temp
, strlen(temp
));
1723 * smk_write_logging - write() for /smack/logging
1724 * @file: file pointer, not actually used
1725 * @buf: where to get the data from
1726 * @count: bytes sent
1727 * @ppos: where to start
1729 * Returns number of bytes written or error code, as appropriate
1731 static ssize_t
smk_write_logging(struct file
*file
, const char __user
*buf
,
1732 size_t count
, loff_t
*ppos
)
1737 if (!smack_privileged(CAP_MAC_ADMIN
))
1740 if (count
>= sizeof(temp
) || count
== 0)
1743 if (copy_from_user(temp
, buf
, count
) != 0)
1748 if (sscanf(temp
, "%d", &i
) != 1)
1758 static const struct file_operations smk_logging_ops
= {
1759 .read
= smk_read_logging
,
1760 .write
= smk_write_logging
,
1761 .llseek
= default_llseek
,
1765 * Seq_file read operations for /smack/load-self
1768 static void *load_self_seq_start(struct seq_file
*s
, loff_t
*pos
)
1770 struct task_smack
*tsp
= current_security();
1772 return smk_seq_start(s
, pos
, &tsp
->smk_rules
);
1775 static void *load_self_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
1777 struct task_smack
*tsp
= current_security();
1779 return smk_seq_next(s
, v
, pos
, &tsp
->smk_rules
);
1782 static int load_self_seq_show(struct seq_file
*s
, void *v
)
1784 struct list_head
*list
= v
;
1785 struct smack_rule
*srp
=
1786 list_entry(list
, struct smack_rule
, list
);
1788 smk_rule_show(s
, srp
, SMK_LABELLEN
);
1793 static const struct seq_operations load_self_seq_ops
= {
1794 .start
= load_self_seq_start
,
1795 .next
= load_self_seq_next
,
1796 .show
= load_self_seq_show
,
1797 .stop
= smk_seq_stop
,
1802 * smk_open_load_self - open() for /smack/load-self2
1803 * @inode: inode structure representing file
1804 * @file: "load" file pointer
1806 * For reading, use load_seq_* seq_file reading operations.
1808 static int smk_open_load_self(struct inode
*inode
, struct file
*file
)
1810 return seq_open(file
, &load_self_seq_ops
);
1814 * smk_write_load_self - write() for /smack/load-self
1815 * @file: file pointer, not actually used
1816 * @buf: where to get the data from
1817 * @count: bytes sent
1818 * @ppos: where to start - must be 0
1821 static ssize_t
smk_write_load_self(struct file
*file
, const char __user
*buf
,
1822 size_t count
, loff_t
*ppos
)
1824 struct task_smack
*tsp
= current_security();
1826 return smk_write_rules_list(file
, buf
, count
, ppos
, &tsp
->smk_rules
,
1827 &tsp
->smk_rules_lock
, SMK_FIXED24_FMT
);
1830 static const struct file_operations smk_load_self_ops
= {
1831 .open
= smk_open_load_self
,
1833 .llseek
= seq_lseek
,
1834 .write
= smk_write_load_self
,
1835 .release
= seq_release
,
1839 * smk_user_access - handle access check transaction
1840 * @file: file pointer
1841 * @buf: data from user space
1842 * @count: bytes sent
1843 * @ppos: where to start - must be 0
1845 static ssize_t
smk_user_access(struct file
*file
, const char __user
*buf
,
1846 size_t count
, loff_t
*ppos
, int format
)
1848 struct smack_parsed_rule rule
;
1852 data
= simple_transaction_get(file
, buf
, count
);
1854 return PTR_ERR(data
);
1856 if (format
== SMK_FIXED24_FMT
) {
1857 if (count
< SMK_LOADLEN
)
1859 res
= smk_parse_rule(data
, &rule
, 0);
1862 * simple_transaction_get() returns null-terminated data
1864 res
= smk_parse_long_rule(data
, &rule
, 0, 3);
1868 res
= smk_access(rule
.smk_subject
, rule
.smk_object
,
1869 rule
.smk_access1
, NULL
);
1870 else if (res
!= -ENOENT
)
1873 data
[0] = res
== 0 ? '1' : '0';
1876 simple_transaction_set(file
, 2);
1878 if (format
== SMK_FIXED24_FMT
)
1884 * smk_write_access - handle access check transaction
1885 * @file: file pointer
1886 * @buf: data from user space
1887 * @count: bytes sent
1888 * @ppos: where to start - must be 0
1890 static ssize_t
smk_write_access(struct file
*file
, const char __user
*buf
,
1891 size_t count
, loff_t
*ppos
)
1893 return smk_user_access(file
, buf
, count
, ppos
, SMK_FIXED24_FMT
);
1896 static const struct file_operations smk_access_ops
= {
1897 .write
= smk_write_access
,
1898 .read
= simple_transaction_read
,
1899 .release
= simple_transaction_release
,
1900 .llseek
= generic_file_llseek
,
1905 * Seq_file read operations for /smack/load2
1908 static int load2_seq_show(struct seq_file
*s
, void *v
)
1910 struct list_head
*list
= v
;
1911 struct smack_master_list
*smlp
=
1912 list_entry(list
, struct smack_master_list
, list
);
1914 smk_rule_show(s
, smlp
->smk_rule
, SMK_LONGLABEL
);
1919 static const struct seq_operations load2_seq_ops
= {
1920 .start
= load2_seq_start
,
1921 .next
= load2_seq_next
,
1922 .show
= load2_seq_show
,
1923 .stop
= smk_seq_stop
,
1927 * smk_open_load2 - open() for /smack/load2
1928 * @inode: inode structure representing file
1929 * @file: "load2" file pointer
1931 * For reading, use load2_seq_* seq_file reading operations.
1933 static int smk_open_load2(struct inode
*inode
, struct file
*file
)
1935 return seq_open(file
, &load2_seq_ops
);
1939 * smk_write_load2 - write() for /smack/load2
1940 * @file: file pointer, not actually used
1941 * @buf: where to get the data from
1942 * @count: bytes sent
1943 * @ppos: where to start - must be 0
1946 static ssize_t
smk_write_load2(struct file
*file
, const char __user
*buf
,
1947 size_t count
, loff_t
*ppos
)
1950 * Must have privilege.
1952 if (!smack_privileged(CAP_MAC_ADMIN
))
1955 return smk_write_rules_list(file
, buf
, count
, ppos
, NULL
, NULL
,
1959 static const struct file_operations smk_load2_ops
= {
1960 .open
= smk_open_load2
,
1962 .llseek
= seq_lseek
,
1963 .write
= smk_write_load2
,
1964 .release
= seq_release
,
1968 * Seq_file read operations for /smack/load-self2
1971 static void *load_self2_seq_start(struct seq_file
*s
, loff_t
*pos
)
1973 struct task_smack
*tsp
= current_security();
1975 return smk_seq_start(s
, pos
, &tsp
->smk_rules
);
1978 static void *load_self2_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
1980 struct task_smack
*tsp
= current_security();
1982 return smk_seq_next(s
, v
, pos
, &tsp
->smk_rules
);
1985 static int load_self2_seq_show(struct seq_file
*s
, void *v
)
1987 struct list_head
*list
= v
;
1988 struct smack_rule
*srp
=
1989 list_entry(list
, struct smack_rule
, list
);
1991 smk_rule_show(s
, srp
, SMK_LONGLABEL
);
1996 static const struct seq_operations load_self2_seq_ops
= {
1997 .start
= load_self2_seq_start
,
1998 .next
= load_self2_seq_next
,
1999 .show
= load_self2_seq_show
,
2000 .stop
= smk_seq_stop
,
2004 * smk_open_load_self2 - open() for /smack/load-self2
2005 * @inode: inode structure representing file
2006 * @file: "load" file pointer
2008 * For reading, use load_seq_* seq_file reading operations.
2010 static int smk_open_load_self2(struct inode
*inode
, struct file
*file
)
2012 return seq_open(file
, &load_self2_seq_ops
);
2016 * smk_write_load_self2 - write() for /smack/load-self2
2017 * @file: file pointer, not actually used
2018 * @buf: where to get the data from
2019 * @count: bytes sent
2020 * @ppos: where to start - must be 0
2023 static ssize_t
smk_write_load_self2(struct file
*file
, const char __user
*buf
,
2024 size_t count
, loff_t
*ppos
)
2026 struct task_smack
*tsp
= current_security();
2028 return smk_write_rules_list(file
, buf
, count
, ppos
, &tsp
->smk_rules
,
2029 &tsp
->smk_rules_lock
, SMK_LONG_FMT
);
2032 static const struct file_operations smk_load_self2_ops
= {
2033 .open
= smk_open_load_self2
,
2035 .llseek
= seq_lseek
,
2036 .write
= smk_write_load_self2
,
2037 .release
= seq_release
,
2041 * smk_write_access2 - handle access check transaction
2042 * @file: file pointer
2043 * @buf: data from user space
2044 * @count: bytes sent
2045 * @ppos: where to start - must be 0
2047 static ssize_t
smk_write_access2(struct file
*file
, const char __user
*buf
,
2048 size_t count
, loff_t
*ppos
)
2050 return smk_user_access(file
, buf
, count
, ppos
, SMK_LONG_FMT
);
2053 static const struct file_operations smk_access2_ops
= {
2054 .write
= smk_write_access2
,
2055 .read
= simple_transaction_read
,
2056 .release
= simple_transaction_release
,
2057 .llseek
= generic_file_llseek
,
2061 * smk_write_revoke_subj - write() for /smack/revoke-subject
2062 * @file: file pointer
2063 * @buf: data from user space
2064 * @count: bytes sent
2065 * @ppos: where to start - must be 0
2067 static ssize_t
smk_write_revoke_subj(struct file
*file
, const char __user
*buf
,
2068 size_t count
, loff_t
*ppos
)
2071 const char *cp
= NULL
;
2072 struct smack_known
*skp
;
2073 struct smack_rule
*sp
;
2074 struct list_head
*rule_list
;
2075 struct mutex
*rule_lock
;
2081 if (!smack_privileged(CAP_MAC_ADMIN
))
2084 if (count
== 0 || count
> SMK_LONGLABEL
)
2087 data
= kzalloc(count
, GFP_KERNEL
);
2091 if (copy_from_user(data
, buf
, count
) != 0) {
2096 cp
= smk_parse_smack(data
, count
);
2102 skp
= smk_find_entry(cp
);
2106 rule_list
= &skp
->smk_rules
;
2107 rule_lock
= &skp
->smk_rules_lock
;
2109 mutex_lock(rule_lock
);
2111 list_for_each_entry_rcu(sp
, rule_list
, list
)
2114 mutex_unlock(rule_lock
);
2122 static const struct file_operations smk_revoke_subj_ops
= {
2123 .write
= smk_write_revoke_subj
,
2124 .read
= simple_transaction_read
,
2125 .release
= simple_transaction_release
,
2126 .llseek
= generic_file_llseek
,
2129 static struct kset
*smackfs_kset
;
2131 * smk_init_sysfs - initialize /sys/fs/smackfs
2134 static int smk_init_sysfs(void)
2136 smackfs_kset
= kset_create_and_add("smackfs", NULL
, fs_kobj
);
2143 * smk_write_change_rule - write() for /smack/change-rule
2144 * @file: file pointer
2145 * @buf: data from user space
2146 * @count: bytes sent
2147 * @ppos: where to start - must be 0
2149 static ssize_t
smk_write_change_rule(struct file
*file
, const char __user
*buf
,
2150 size_t count
, loff_t
*ppos
)
2153 * Must have privilege.
2155 if (!smack_privileged(CAP_MAC_ADMIN
))
2158 return smk_write_rules_list(file
, buf
, count
, ppos
, NULL
, NULL
,
2162 static const struct file_operations smk_change_rule_ops
= {
2163 .write
= smk_write_change_rule
,
2164 .read
= simple_transaction_read
,
2165 .release
= simple_transaction_release
,
2166 .llseek
= generic_file_llseek
,
2170 * smk_read_syslog - read() for smackfs/syslog
2171 * @filp: file pointer, not actually used
2172 * @buf: where to put the result
2173 * @cn: maximum to send along
2174 * @ppos: where to start
2176 * Returns number of bytes read or error code, as appropriate
2178 static ssize_t
smk_read_syslog(struct file
*filp
, char __user
*buf
,
2179 size_t cn
, loff_t
*ppos
)
2181 struct smack_known
*skp
;
2182 ssize_t rc
= -EINVAL
;
2188 if (smack_syslog_label
== NULL
)
2189 skp
= &smack_known_star
;
2191 skp
= smack_syslog_label
;
2193 asize
= strlen(skp
->smk_known
) + 1;
2196 rc
= simple_read_from_buffer(buf
, cn
, ppos
, skp
->smk_known
,
2203 * smk_write_syslog - write() for smackfs/syslog
2204 * @file: file pointer, not actually used
2205 * @buf: where to get the data from
2206 * @count: bytes sent
2207 * @ppos: where to start
2209 * Returns number of bytes written or error code, as appropriate
2211 static ssize_t
smk_write_syslog(struct file
*file
, const char __user
*buf
,
2212 size_t count
, loff_t
*ppos
)
2215 struct smack_known
*skp
;
2218 if (!smack_privileged(CAP_MAC_ADMIN
))
2221 data
= kzalloc(count
, GFP_KERNEL
);
2225 if (copy_from_user(data
, buf
, count
) != 0)
2228 skp
= smk_import_entry(data
, count
);
2232 smack_syslog_label
= smk_import_entry(data
, count
);
2239 static const struct file_operations smk_syslog_ops
= {
2240 .read
= smk_read_syslog
,
2241 .write
= smk_write_syslog
,
2242 .llseek
= default_llseek
,
2247 * smk_fill_super - fill the smackfs superblock
2248 * @sb: the empty superblock
2252 * Fill in the well known entries for the smack filesystem
2254 * Returns 0 on success, an error code on failure
2256 static int smk_fill_super(struct super_block
*sb
, void *data
, int silent
)
2259 struct inode
*root_inode
;
2261 static struct tree_descr smack_files
[] = {
2263 "load", &smk_load_ops
, S_IRUGO
|S_IWUSR
},
2265 "cipso", &smk_cipso_ops
, S_IRUGO
|S_IWUSR
},
2267 "doi", &smk_doi_ops
, S_IRUGO
|S_IWUSR
},
2269 "direct", &smk_direct_ops
, S_IRUGO
|S_IWUSR
},
2271 "ambient", &smk_ambient_ops
, S_IRUGO
|S_IWUSR
},
2272 [SMK_NETLBLADDR
] = {
2273 "netlabel", &smk_netlbladdr_ops
, S_IRUGO
|S_IWUSR
},
2275 "onlycap", &smk_onlycap_ops
, S_IRUGO
|S_IWUSR
},
2277 "logging", &smk_logging_ops
, S_IRUGO
|S_IWUSR
},
2279 "load-self", &smk_load_self_ops
, S_IRUGO
|S_IWUGO
},
2281 "access", &smk_access_ops
, S_IRUGO
|S_IWUGO
},
2283 "mapped", &smk_mapped_ops
, S_IRUGO
|S_IWUSR
},
2285 "load2", &smk_load2_ops
, S_IRUGO
|S_IWUSR
},
2286 [SMK_LOAD_SELF2
] = {
2287 "load-self2", &smk_load_self2_ops
, S_IRUGO
|S_IWUGO
},
2289 "access2", &smk_access2_ops
, S_IRUGO
|S_IWUGO
},
2291 "cipso2", &smk_cipso2_ops
, S_IRUGO
|S_IWUSR
},
2292 [SMK_REVOKE_SUBJ
] = {
2293 "revoke-subject", &smk_revoke_subj_ops
,
2295 [SMK_CHANGE_RULE
] = {
2296 "change-rule", &smk_change_rule_ops
, S_IRUGO
|S_IWUSR
},
2298 "syslog", &smk_syslog_ops
, S_IRUGO
|S_IWUSR
},
2303 rc
= simple_fill_super(sb
, SMACK_MAGIC
, smack_files
);
2305 printk(KERN_ERR
"%s failed %d while creating inodes\n",
2310 root_inode
= sb
->s_root
->d_inode
;
2316 * smk_mount - get the smackfs superblock
2317 * @fs_type: passed along without comment
2318 * @flags: passed along without comment
2319 * @dev_name: passed along without comment
2320 * @data: passed along without comment
2322 * Just passes everything along.
2324 * Returns what the lower level code does.
2326 static struct dentry
*smk_mount(struct file_system_type
*fs_type
,
2327 int flags
, const char *dev_name
, void *data
)
2329 return mount_single(fs_type
, flags
, data
, smk_fill_super
);
2332 static struct file_system_type smk_fs_type
= {
2335 .kill_sb
= kill_litter_super
,
2338 static struct vfsmount
*smackfs_mount
;
2340 static int __init
smk_preset_netlabel(struct smack_known
*skp
)
2342 skp
->smk_netlabel
.domain
= skp
->smk_known
;
2343 skp
->smk_netlabel
.flags
=
2344 NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
2345 return smk_netlbl_mls(smack_cipso_direct
, skp
->smk_known
,
2346 &skp
->smk_netlabel
, strlen(skp
->smk_known
));
2350 * init_smk_fs - get the smackfs superblock
2352 * register the smackfs
2354 * Do not register smackfs if Smack wasn't enabled
2355 * on boot. We can not put this method normally under the
2356 * smack_init() code path since the security subsystem get
2357 * initialized before the vfs caches.
2359 * Returns true if we were not chosen on boot or if
2360 * we were chosen and filesystem registration succeeded.
2362 static int __init
init_smk_fs(void)
2367 if (!security_module_enable(&smack_ops
))
2370 err
= smk_init_sysfs();
2372 printk(KERN_ERR
"smackfs: sysfs mountpoint problem.\n");
2374 err
= register_filesystem(&smk_fs_type
);
2376 smackfs_mount
= kern_mount(&smk_fs_type
);
2377 if (IS_ERR(smackfs_mount
)) {
2378 printk(KERN_ERR
"smackfs: could not mount!\n");
2379 err
= PTR_ERR(smackfs_mount
);
2380 smackfs_mount
= NULL
;
2385 smk_unlbl_ambient(NULL
);
2387 rc
= smk_preset_netlabel(&smack_known_floor
);
2388 if (err
== 0 && rc
< 0)
2390 rc
= smk_preset_netlabel(&smack_known_hat
);
2391 if (err
== 0 && rc
< 0)
2393 rc
= smk_preset_netlabel(&smack_known_huh
);
2394 if (err
== 0 && rc
< 0)
2396 rc
= smk_preset_netlabel(&smack_known_invalid
);
2397 if (err
== 0 && rc
< 0)
2399 rc
= smk_preset_netlabel(&smack_known_star
);
2400 if (err
== 0 && rc
< 0)
2402 rc
= smk_preset_netlabel(&smack_known_web
);
2403 if (err
== 0 && rc
< 0)
2409 __initcall(init_smk_fs
);