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.
12 * Special thanks to the authors of selinuxfs.
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/netlabel.h>
26 #include <net/cipso_ipv4.h>
27 #include <linux/seq_file.h>
28 #include <linux/ctype.h>
29 #include <linux/audit.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 */
52 static DEFINE_MUTEX(smack_list_lock);
53 static DEFINE_MUTEX(smack_cipso_lock);
54 static DEFINE_MUTEX(smack_ambient_lock);
55 static DEFINE_MUTEX(smk_netlbladdr_lock);
58 * This is the "ambient" label for network traffic.
59 * If it isn't somehow marked, use this.
60 * It can be reset via smackfs/ambient
62 char *smack_net_ambient = smack_known_floor.smk_known;
65 * This is the level in a CIPSO header that indicates a
66 * smack label is contained directly in the category set.
67 * It can be reset via smackfs/direct
69 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
72 * Unless a process is running with this label even
73 * having CAP_MAC_OVERRIDE isn't enough to grant
74 * privilege to violate MAC policy. If no label is
75 * designated (the NULL case) capabilities apply to
76 * everyone. It is expected that the hat (^) label
77 * will be used if any label is used.
82 * Certain IP addresses may be designated as single label hosts.
83 * Packets are sent there unlabeled, but only from tasks that
84 * can write to the specified label.
87 LIST_HEAD(smk_netlbladdr_list);
88 LIST_HEAD(smack_rule_list);
90 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
92 const char *smack_cipso_option = SMACK_CIPSO_OPTION;
95 #define SEQ_READ_FINISHED 1
98 * Values for parsing cipso rules
99 * SMK_DIGITLEN: Length of a digit field in a rule.
100 * SMK_CIPSOMIN: Minimum possible cipso rule length.
101 * SMK_CIPSOMAX: Maximum possible cipso rule length.
103 #define SMK_DIGITLEN 4
104 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
105 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
108 * Values for parsing MAC rules
109 * SMK_ACCESS: Maximum possible combination of access permissions
110 * SMK_ACCESSLEN: Maximum length for a rule access field
111 * SMK_LOADLEN: Smack rule length
113 #define SMK_OACCESS "rwxa"
114 #define SMK_ACCESS "rwxat"
115 #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
116 #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
117 #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
118 #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
121 * smk_netlabel_audit_set - fill a netlbl_audit struct
122 * @nap: structure to fill
124 static void smk_netlabel_audit_set(struct netlbl_audit *nap)
126 nap->loginuid = audit_get_loginuid(current);
127 nap->sessionid = audit_get_sessionid(current);
128 nap->secid = smack_to_secid(smk_of_current());
132 * Values for parsing single label host rules
134 * "192.168.138.129/32 abcdefghijklmnopqrstuvw"
136 #define SMK_NETLBLADDRMIN 9
137 #define SMK_NETLBLADDRMAX 42
140 * smk_set_access - add a rule to the rule list
141 * @srp: the new rule to add
142 * @rule_list: the list of rules
143 * @rule_lock: the rule list lock
145 * Looks through the current subject/object/access list for
146 * the subject/object pair and replaces the access that was
147 * there. If the pair isn't found add it with the specified
150 * Returns 1 if a rule was found to exist already, 0 if it is new
151 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
152 * during the allocation of the new pair to add.
154 static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
155 struct mutex *rule_lock)
157 struct smack_rule *sp;
160 mutex_lock(rule_lock);
162 list_for_each_entry_rcu(sp, rule_list, list) {
163 if (sp->smk_subject == srp->smk_subject &&
164 sp->smk_object == srp->smk_object) {
166 sp->smk_access = srp->smk_access;
171 list_add_rcu(&srp->list, rule_list);
173 mutex_unlock(rule_lock);
179 * smk_write_load_list - write() for any /smack/load
180 * @file: file pointer, not actually used
181 * @buf: where to get the data from
183 * @ppos: where to start - must be 0
184 * @rule_list: the list of rules to write to
185 * @rule_lock: lock for the rule list
187 * Get one smack access rule from above.
188 * The format is exactly:
189 * char subject[SMK_LABELLEN]
190 * char object[SMK_LABELLEN]
191 * char access[SMK_ACCESSLEN]
193 * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
195 static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
196 size_t count, loff_t *ppos,
197 struct list_head *rule_list,
198 struct mutex *rule_lock)
200 struct smack_rule *rule;
206 * Enough data must be present.
211 * Minor hack for backward compatibility
213 if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN)
216 data = kzalloc(SMK_LOADLEN, GFP_KERNEL);
220 if (copy_from_user(data, buf, count) != 0) {
226 * More on the minor hack for backward compatibility
228 if (count == (SMK_OLOADLEN))
229 data[SMK_OLOADLEN] = '-';
231 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
237 rule->smk_subject = smk_import(data, 0);
238 if (rule->smk_subject == NULL)
241 rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
242 if (rule->smk_object == NULL)
245 rule->smk_access = 0;
247 switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
252 rule->smk_access |= MAY_READ;
258 switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
263 rule->smk_access |= MAY_WRITE;
269 switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
274 rule->smk_access |= MAY_EXEC;
280 switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
285 rule->smk_access |= MAY_APPEND;
291 switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) {
296 rule->smk_access |= MAY_TRANSMUTE;
304 * smk_set_access returns true if there was already a rule
305 * for the subject/object pair, and false if it was new.
307 if (!smk_set_access(rule, rule_list, rule_lock))
319 * Seq_file read operations for /smack/load
322 static void *load_seq_start(struct seq_file *s, loff_t *pos)
324 if (*pos == SEQ_READ_FINISHED)
326 if (list_empty(&smack_rule_list))
328 return smack_rule_list.next;
331 static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
333 struct list_head *list = v;
335 if (list_is_last(list, &smack_rule_list)) {
336 *pos = SEQ_READ_FINISHED;
342 static int load_seq_show(struct seq_file *s, void *v)
344 struct list_head *list = v;
345 struct smack_rule *srp =
346 list_entry(list, struct smack_rule, list);
348 seq_printf(s, "%s %s", (char *)srp->smk_subject,
349 (char *)srp->smk_object);
353 if (srp->smk_access & MAY_READ)
355 if (srp->smk_access & MAY_WRITE)
357 if (srp->smk_access & MAY_EXEC)
359 if (srp->smk_access & MAY_APPEND)
361 if (srp->smk_access & MAY_TRANSMUTE)
363 if (srp->smk_access == 0)
371 static void load_seq_stop(struct seq_file *s, void *v)
376 static const struct seq_operations load_seq_ops = {
377 .start = load_seq_start,
378 .next = load_seq_next,
379 .show = load_seq_show,
380 .stop = load_seq_stop,
384 * smk_open_load - open() for /smack/load
385 * @inode: inode structure representing file
386 * @file: "load" file pointer
388 * For reading, use load_seq_* seq_file reading operations.
390 static int smk_open_load(struct inode *inode, struct file *file)
392 return seq_open(file, &load_seq_ops);
396 * smk_write_load - write() for /smack/load
397 * @file: file pointer, not actually used
398 * @buf: where to get the data from
400 * @ppos: where to start - must be 0
403 static ssize_t smk_write_load(struct file *file, const char __user *buf,
404 size_t count, loff_t *ppos)
408 * Must have privilege.
410 * Enough data must be present.
412 if (!capable(CAP_MAC_ADMIN))
415 return smk_write_load_list(file, buf, count, ppos, &smack_rule_list,
419 static const struct file_operations smk_load_ops = {
420 .open = smk_open_load,
423 .write = smk_write_load,
424 .release = seq_release,
428 * smk_cipso_doi - initialize the CIPSO domain
430 static void smk_cipso_doi(void)
433 struct cipso_v4_doi *doip;
434 struct netlbl_audit nai;
436 smk_netlabel_audit_set(&nai);
438 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
440 printk(KERN_WARNING "%s:%d remove rc = %d\n",
441 __func__, __LINE__, rc);
443 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
445 panic("smack: Failed to initialize cipso DOI.\n");
446 doip->map.std = NULL;
447 doip->doi = smk_cipso_doi_value;
448 doip->type = CIPSO_V4_MAP_PASS;
449 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
450 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
451 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
453 rc = netlbl_cfg_cipsov4_add(doip, &nai);
455 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
456 __func__, __LINE__, rc);
460 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
462 printk(KERN_WARNING "%s:%d map add rc = %d\n",
463 __func__, __LINE__, rc);
470 * smk_unlbl_ambient - initialize the unlabeled domain
471 * @oldambient: previous domain string
473 static void smk_unlbl_ambient(char *oldambient)
476 struct netlbl_audit nai;
478 smk_netlabel_audit_set(&nai);
480 if (oldambient != NULL) {
481 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
483 printk(KERN_WARNING "%s:%d remove rc = %d\n",
484 __func__, __LINE__, rc);
487 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
490 printk(KERN_WARNING "%s:%d add rc = %d\n",
491 __func__, __LINE__, rc);
495 * Seq_file read operations for /smack/cipso
498 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
500 if (*pos == SEQ_READ_FINISHED)
502 if (list_empty(&smack_known_list))
505 return smack_known_list.next;
508 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
510 struct list_head *list = v;
513 * labels with no associated cipso value wont be printed
516 if (list_is_last(list, &smack_known_list)) {
517 *pos = SEQ_READ_FINISHED;
525 * Print cipso labels in format:
526 * label level[/cat[,cat]]
528 static int cipso_seq_show(struct seq_file *s, void *v)
530 struct list_head *list = v;
531 struct smack_known *skp =
532 list_entry(list, struct smack_known, list);
533 struct smack_cipso *scp = skp->smk_cipso;
543 seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
545 cbp = scp->smk_catset;
546 for (i = 0; i < SMK_LABELLEN; i++)
547 for (m = 0x80; m != 0; m >>= 1) {
549 seq_printf(s, "%c%d", sep, cat);
560 static void cipso_seq_stop(struct seq_file *s, void *v)
565 static const struct seq_operations cipso_seq_ops = {
566 .start = cipso_seq_start,
567 .stop = cipso_seq_stop,
568 .next = cipso_seq_next,
569 .show = cipso_seq_show,
573 * smk_open_cipso - open() for /smack/cipso
574 * @inode: inode structure representing file
575 * @file: "cipso" file pointer
577 * Connect our cipso_seq_* operations with /smack/cipso
580 static int smk_open_cipso(struct inode *inode, struct file *file)
582 return seq_open(file, &cipso_seq_ops);
586 * smk_write_cipso - write() for /smack/cipso
587 * @file: file pointer, not actually used
588 * @buf: where to get the data from
590 * @ppos: where to start
592 * Accepts only one cipso rule per write call.
593 * Returns number of bytes written or error code, as appropriate
595 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
596 size_t count, loff_t *ppos)
598 struct smack_known *skp;
599 struct smack_cipso *scp = NULL;
600 char mapcatset[SMK_LABELLEN];
604 ssize_t rc = -EINVAL;
611 * Must have privilege.
613 * Enough data must be present.
615 if (!capable(CAP_MAC_ADMIN))
619 if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
622 data = kzalloc(count + 1, GFP_KERNEL);
626 if (copy_from_user(data, buf, count) != 0) {
631 /* labels cannot begin with a '-' */
632 if (data[0] == '-') {
639 * Only allow one writer at a time. Writes should be
640 * quite rare and small in any case.
642 mutex_lock(&smack_cipso_lock);
644 skp = smk_import_entry(rule, 0);
648 rule += SMK_LABELLEN;
649 ret = sscanf(rule, "%d", &maplevel);
650 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
653 rule += SMK_DIGITLEN;
654 ret = sscanf(rule, "%d", &catlen);
655 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
658 if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
661 memset(mapcatset, 0, sizeof(mapcatset));
663 for (i = 0; i < catlen; i++) {
664 rule += SMK_DIGITLEN;
665 ret = sscanf(rule, "%d", &cat);
666 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
669 smack_catset_bit(cat, mapcatset);
672 if (skp->smk_cipso == NULL) {
673 scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
680 spin_lock_bh(&skp->smk_cipsolock);
683 scp = skp->smk_cipso;
685 skp->smk_cipso = scp;
687 scp->smk_level = maplevel;
688 memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
690 spin_unlock_bh(&skp->smk_cipsolock);
694 mutex_unlock(&smack_cipso_lock);
700 static const struct file_operations smk_cipso_ops = {
701 .open = smk_open_cipso,
704 .write = smk_write_cipso,
705 .release = seq_release,
709 * Seq_file read operations for /smack/netlabel
712 static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
714 if (*pos == SEQ_READ_FINISHED)
716 if (list_empty(&smk_netlbladdr_list))
718 return smk_netlbladdr_list.next;
721 static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
723 struct list_head *list = v;
725 if (list_is_last(list, &smk_netlbladdr_list)) {
726 *pos = SEQ_READ_FINISHED;
732 #define BEBITS (sizeof(__be32) * 8)
735 * Print host/label pairs
737 static int netlbladdr_seq_show(struct seq_file *s, void *v)
739 struct list_head *list = v;
740 struct smk_netlbladdr *skp =
741 list_entry(list, struct smk_netlbladdr, list);
742 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
744 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
746 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
748 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
749 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
754 static void netlbladdr_seq_stop(struct seq_file *s, void *v)
759 static const struct seq_operations netlbladdr_seq_ops = {
760 .start = netlbladdr_seq_start,
761 .stop = netlbladdr_seq_stop,
762 .next = netlbladdr_seq_next,
763 .show = netlbladdr_seq_show,
767 * smk_open_netlbladdr - open() for /smack/netlabel
768 * @inode: inode structure representing file
769 * @file: "netlabel" file pointer
771 * Connect our netlbladdr_seq_* operations with /smack/netlabel
774 static int smk_open_netlbladdr(struct inode *inode, struct file *file)
776 return seq_open(file, &netlbladdr_seq_ops);
780 * smk_netlbladdr_insert
781 * @new : netlabel to insert
783 * This helper insert netlabel in the smack_netlbladdrs list
784 * sorted by netmask length (longest to smallest)
785 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
788 static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
790 struct smk_netlbladdr *m, *m_next;
792 if (list_empty(&smk_netlbladdr_list)) {
793 list_add_rcu(&new->list, &smk_netlbladdr_list);
797 m = list_entry_rcu(smk_netlbladdr_list.next,
798 struct smk_netlbladdr, list);
800 /* the comparison '>' is a bit hacky, but works */
801 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
802 list_add_rcu(&new->list, &smk_netlbladdr_list);
806 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
807 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
808 list_add_rcu(&new->list, &m->list);
811 m_next = list_entry_rcu(m->list.next,
812 struct smk_netlbladdr, list);
813 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
814 list_add_rcu(&new->list, &m->list);
822 * smk_write_netlbladdr - write() for /smack/netlabel
823 * @file: file pointer, not actually used
824 * @buf: where to get the data from
826 * @ppos: where to start
828 * Accepts only one netlbladdr per write call.
829 * Returns number of bytes written or error code, as appropriate
831 static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
832 size_t count, loff_t *ppos)
834 struct smk_netlbladdr *skp;
835 struct sockaddr_in newname;
836 char smack[SMK_LABELLEN];
838 char data[SMK_NETLBLADDRMAX + 1];
839 char *host = (char *)&newname.sin_addr.s_addr;
841 struct netlbl_audit audit_info;
845 u32 mask_bits = (1<<31);
850 * Must have privilege.
852 * Enough data must be present.
853 * "<addr/mask, as a.b.c.d/e><space><label>"
854 * "<addr, as a.b.c.d><space><label>"
856 if (!capable(CAP_MAC_ADMIN))
860 if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
862 if (copy_from_user(data, buf, count) != 0)
867 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
868 &host[0], &host[1], &host[2], &host[3], &m, smack);
870 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
871 &host[0], &host[1], &host[2], &host[3], smack);
879 /* if smack begins with '-', its an option, don't import it */
880 if (smack[0] != '-') {
881 sp = smk_import(smack, 0);
885 /* check known options */
886 if (strcmp(smack, smack_cipso_option) == 0)
887 sp = (char *)smack_cipso_option;
892 for (temp_mask = 0; m > 0; m--) {
893 temp_mask |= mask_bits;
896 mask.s_addr = cpu_to_be32(temp_mask);
898 newname.sin_addr.s_addr &= mask.s_addr;
900 * Only allow one writer at a time. Writes should be
901 * quite rare and small in any case.
903 mutex_lock(&smk_netlbladdr_lock);
905 nsa = newname.sin_addr.s_addr;
906 /* try to find if the prefix is already in the list */
908 list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
909 if (skp->smk_host.sin_addr.s_addr == nsa &&
910 skp->smk_mask.s_addr == mask.s_addr) {
915 smk_netlabel_audit_set(&audit_info);
918 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
923 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
924 skp->smk_mask.s_addr = mask.s_addr;
926 smk_netlbladdr_insert(skp);
929 /* we delete the unlabeled entry, only if the previous label
930 * wasn't the special CIPSO option */
931 if (skp->smk_label != smack_cipso_option)
932 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
933 &skp->smk_host.sin_addr, &skp->smk_mask,
934 PF_INET, &audit_info);
941 * Now tell netlabel about the single label nature of
942 * this host so that incoming packets get labeled.
943 * but only if we didn't get the special CIPSO option
945 if (rc == 0 && sp != smack_cipso_option)
946 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
947 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
948 smack_to_secid(skp->smk_label), &audit_info);
953 mutex_unlock(&smk_netlbladdr_lock);
958 static const struct file_operations smk_netlbladdr_ops = {
959 .open = smk_open_netlbladdr,
962 .write = smk_write_netlbladdr,
963 .release = seq_release,
967 * smk_read_doi - read() for /smack/doi
968 * @filp: file pointer, not actually used
969 * @buf: where to put the result
970 * @count: maximum to send along
971 * @ppos: where to start
973 * Returns number of bytes read or error code, as appropriate
975 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
976 size_t count, loff_t *ppos)
984 sprintf(temp, "%d", smk_cipso_doi_value);
985 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
991 * smk_write_doi - write() for /smack/doi
992 * @file: file pointer, not actually used
993 * @buf: where to get the data from
995 * @ppos: where to start
997 * Returns number of bytes written or error code, as appropriate
999 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1000 size_t count, loff_t *ppos)
1005 if (!capable(CAP_MAC_ADMIN))
1008 if (count >= sizeof(temp) || count == 0)
1011 if (copy_from_user(temp, buf, count) != 0)
1016 if (sscanf(temp, "%d", &i) != 1)
1019 smk_cipso_doi_value = i;
1026 static const struct file_operations smk_doi_ops = {
1027 .read = smk_read_doi,
1028 .write = smk_write_doi,
1029 .llseek = default_llseek,
1033 * smk_read_direct - read() for /smack/direct
1034 * @filp: file pointer, not actually used
1035 * @buf: where to put the result
1036 * @count: maximum to send along
1037 * @ppos: where to start
1039 * Returns number of bytes read or error code, as appropriate
1041 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1042 size_t count, loff_t *ppos)
1050 sprintf(temp, "%d", smack_cipso_direct);
1051 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1057 * smk_write_direct - write() for /smack/direct
1058 * @file: file pointer, not actually used
1059 * @buf: where to get the data from
1060 * @count: bytes sent
1061 * @ppos: where to start
1063 * Returns number of bytes written or error code, as appropriate
1065 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1066 size_t count, loff_t *ppos)
1071 if (!capable(CAP_MAC_ADMIN))
1074 if (count >= sizeof(temp) || count == 0)
1077 if (copy_from_user(temp, buf, count) != 0)
1082 if (sscanf(temp, "%d", &i) != 1)
1085 smack_cipso_direct = i;
1090 static const struct file_operations smk_direct_ops = {
1091 .read = smk_read_direct,
1092 .write = smk_write_direct,
1093 .llseek = default_llseek,
1097 * smk_read_ambient - read() for /smack/ambient
1098 * @filp: file pointer, not actually used
1099 * @buf: where to put the result
1100 * @cn: maximum to send along
1101 * @ppos: where to start
1103 * Returns number of bytes read or error code, as appropriate
1105 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1106 size_t cn, loff_t *ppos)
1114 * Being careful to avoid a problem in the case where
1115 * smack_net_ambient gets changed in midstream.
1117 mutex_lock(&smack_ambient_lock);
1119 asize = strlen(smack_net_ambient) + 1;
1122 rc = simple_read_from_buffer(buf, cn, ppos,
1123 smack_net_ambient, asize);
1127 mutex_unlock(&smack_ambient_lock);
1133 * smk_write_ambient - write() for /smack/ambient
1134 * @file: file pointer, not actually used
1135 * @buf: where to get the data from
1136 * @count: bytes sent
1137 * @ppos: where to start
1139 * Returns number of bytes written or error code, as appropriate
1141 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1142 size_t count, loff_t *ppos)
1144 char in[SMK_LABELLEN];
1148 if (!capable(CAP_MAC_ADMIN))
1151 if (count >= SMK_LABELLEN)
1154 if (copy_from_user(in, buf, count) != 0)
1157 smack = smk_import(in, count);
1161 mutex_lock(&smack_ambient_lock);
1163 oldambient = smack_net_ambient;
1164 smack_net_ambient = smack;
1165 smk_unlbl_ambient(oldambient);
1167 mutex_unlock(&smack_ambient_lock);
1172 static const struct file_operations smk_ambient_ops = {
1173 .read = smk_read_ambient,
1174 .write = smk_write_ambient,
1175 .llseek = default_llseek,
1179 * smk_read_onlycap - read() for /smack/onlycap
1180 * @filp: file pointer, not actually used
1181 * @buf: where to put the result
1182 * @cn: maximum to send along
1183 * @ppos: where to start
1185 * Returns number of bytes read or error code, as appropriate
1187 static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1188 size_t cn, loff_t *ppos)
1191 ssize_t rc = -EINVAL;
1197 if (smack_onlycap != NULL)
1198 smack = smack_onlycap;
1200 asize = strlen(smack) + 1;
1203 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1209 * smk_write_onlycap - write() for /smack/onlycap
1210 * @file: file pointer, not actually used
1211 * @buf: where to get the data from
1212 * @count: bytes sent
1213 * @ppos: where to start
1215 * Returns number of bytes written or error code, as appropriate
1217 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1218 size_t count, loff_t *ppos)
1220 char in[SMK_LABELLEN];
1221 char *sp = smk_of_task(current->cred->security);
1223 if (!capable(CAP_MAC_ADMIN))
1227 * This can be done using smk_access() but is done
1228 * explicitly for clarity. The smk_access() implementation
1229 * would use smk_access(smack_onlycap, MAY_WRITE)
1231 if (smack_onlycap != NULL && smack_onlycap != sp)
1234 if (count >= SMK_LABELLEN)
1237 if (copy_from_user(in, buf, count) != 0)
1241 * Should the null string be passed in unset the onlycap value.
1242 * This seems like something to be careful with as usually
1243 * smk_import only expects to return NULL for errors. It
1244 * is usually the case that a nullstring or "\n" would be
1245 * bad to pass to smk_import but in fact this is useful here.
1247 smack_onlycap = smk_import(in, count);
1252 static const struct file_operations smk_onlycap_ops = {
1253 .read = smk_read_onlycap,
1254 .write = smk_write_onlycap,
1255 .llseek = default_llseek,
1259 * smk_read_logging - read() for /smack/logging
1260 * @filp: file pointer, not actually used
1261 * @buf: where to put the result
1262 * @cn: maximum to send along
1263 * @ppos: where to start
1265 * Returns number of bytes read or error code, as appropriate
1267 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1268 size_t count, loff_t *ppos)
1276 sprintf(temp, "%d\n", log_policy);
1277 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1282 * smk_write_logging - write() for /smack/logging
1283 * @file: file pointer, not actually used
1284 * @buf: where to get the data from
1285 * @count: bytes sent
1286 * @ppos: where to start
1288 * Returns number of bytes written or error code, as appropriate
1290 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1291 size_t count, loff_t *ppos)
1296 if (!capable(CAP_MAC_ADMIN))
1299 if (count >= sizeof(temp) || count == 0)
1302 if (copy_from_user(temp, buf, count) != 0)
1307 if (sscanf(temp, "%d", &i) != 1)
1317 static const struct file_operations smk_logging_ops = {
1318 .read = smk_read_logging,
1319 .write = smk_write_logging,
1320 .llseek = default_llseek,
1324 * Seq_file read operations for /smack/load-self
1327 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1329 struct task_smack *tsp = current_security();
1331 if (*pos == SEQ_READ_FINISHED)
1333 if (list_empty(&tsp->smk_rules))
1335 return tsp->smk_rules.next;
1338 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1340 struct task_smack *tsp = current_security();
1341 struct list_head *list = v;
1343 if (list_is_last(list, &tsp->smk_rules)) {
1344 *pos = SEQ_READ_FINISHED;
1350 static int load_self_seq_show(struct seq_file *s, void *v)
1352 struct list_head *list = v;
1353 struct smack_rule *srp =
1354 list_entry(list, struct smack_rule, list);
1356 seq_printf(s, "%s %s", (char *)srp->smk_subject,
1357 (char *)srp->smk_object);
1361 if (srp->smk_access & MAY_READ)
1363 if (srp->smk_access & MAY_WRITE)
1365 if (srp->smk_access & MAY_EXEC)
1367 if (srp->smk_access & MAY_APPEND)
1369 if (srp->smk_access & MAY_TRANSMUTE)
1371 if (srp->smk_access == 0)
1379 static void load_self_seq_stop(struct seq_file *s, void *v)
1384 static const struct seq_operations load_self_seq_ops = {
1385 .start = load_self_seq_start,
1386 .next = load_self_seq_next,
1387 .show = load_self_seq_show,
1388 .stop = load_self_seq_stop,
1393 * smk_open_load_self - open() for /smack/load-self
1394 * @inode: inode structure representing file
1395 * @file: "load" file pointer
1397 * For reading, use load_seq_* seq_file reading operations.
1399 static int smk_open_load_self(struct inode *inode, struct file *file)
1401 return seq_open(file, &load_self_seq_ops);
1405 * smk_write_load_self - write() for /smack/load-self
1406 * @file: file pointer, not actually used
1407 * @buf: where to get the data from
1408 * @count: bytes sent
1409 * @ppos: where to start - must be 0
1412 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1413 size_t count, loff_t *ppos)
1415 struct task_smack *tsp = current_security();
1417 return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules,
1418 &tsp->smk_rules_lock);
1421 static const struct file_operations smk_load_self_ops = {
1422 .open = smk_open_load_self,
1424 .llseek = seq_lseek,
1425 .write = smk_write_load_self,
1426 .release = seq_release,
1429 * smk_fill_super - fill the /smackfs superblock
1430 * @sb: the empty superblock
1434 * Fill in the well known entries for /smack
1436 * Returns 0 on success, an error code on failure
1438 static int smk_fill_super(struct super_block *sb, void *data, int silent)
1441 struct inode *root_inode;
1443 static struct tree_descr smack_files[] = {
1445 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
1447 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
1449 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
1451 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
1453 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
1454 [SMK_NETLBLADDR] = {
1455 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
1457 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
1459 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
1461 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
1466 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
1468 printk(KERN_ERR "%s failed %d while creating inodes\n",
1473 root_inode = sb->s_root->d_inode;
1474 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
1480 * smk_mount - get the smackfs superblock
1481 * @fs_type: passed along without comment
1482 * @flags: passed along without comment
1483 * @dev_name: passed along without comment
1484 * @data: passed along without comment
1486 * Just passes everything along.
1488 * Returns what the lower level code does.
1490 static struct dentry *smk_mount(struct file_system_type *fs_type,
1491 int flags, const char *dev_name, void *data)
1493 return mount_single(fs_type, flags, data, smk_fill_super);
1496 static struct file_system_type smk_fs_type = {
1499 .kill_sb = kill_litter_super,
1502 static struct vfsmount *smackfs_mount;
1505 * init_smk_fs - get the smackfs superblock
1507 * register the smackfs
1509 * Do not register smackfs if Smack wasn't enabled
1510 * on boot. We can not put this method normally under the
1511 * smack_init() code path since the security subsystem get
1512 * initialized before the vfs caches.
1514 * Returns true if we were not chosen on boot or if
1515 * we were chosen and filesystem registration succeeded.
1517 static int __init init_smk_fs(void)
1521 if (!security_module_enable(&smack_ops))
1524 err = register_filesystem(&smk_fs_type);
1526 smackfs_mount = kern_mount(&smk_fs_type);
1527 if (IS_ERR(smackfs_mount)) {
1528 printk(KERN_ERR "smackfs: could not mount!\n");
1529 err = PTR_ERR(smackfs_mount);
1530 smackfs_mount = NULL;
1535 smk_unlbl_ambient(NULL);
1540 __initcall(init_smk_fs);