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);