struct smack_known smack_known_huh = {
.smk_known = "?",
.smk_secid = 2,
- .smk_cipso = NULL,
};
struct smack_known smack_known_hat = {
.smk_known = "^",
.smk_secid = 3,
- .smk_cipso = NULL,
};
struct smack_known smack_known_star = {
.smk_known = "*",
.smk_secid = 4,
- .smk_cipso = NULL,
};
struct smack_known smack_known_floor = {
.smk_known = "_",
.smk_secid = 5,
- .smk_cipso = NULL,
};
struct smack_known smack_known_invalid = {
.smk_known = "",
.smk_secid = 6,
- .smk_cipso = NULL,
};
struct smack_known smack_known_web = {
.smk_known = "@",
.smk_secid = 7,
- .smk_cipso = NULL,
};
LIST_HEAD(smack_known_list);
}
/*
- * Return if a specific label has been designated as the
- * only one that gets privilege and current does not
- * have that label.
+ * Allow for priviliged to override policy.
*/
- if (smack_onlycap != NULL && smack_onlycap != sp)
- goto out_audit;
-
- if (capable(CAP_MAC_OVERRIDE))
+ if (rc != 0 && smack_privileged(CAP_MAC_OVERRIDE))
rc = 0;
out_audit:
}
#endif
-static DEFINE_MUTEX(smack_known_lock);
+DEFINE_MUTEX(smack_known_lock);
/**
* smk_find_entry - find a label on the list, return the list entry
struct smack_known *skp;
list_for_each_entry_rcu(skp, &smack_known_list, list) {
- if (strncmp(skp->smk_known, string, SMK_MAXLEN) == 0)
+ if (strcmp(skp->smk_known, string) == 0)
return skp;
}
* smk_parse_smack - parse smack label from a text string
* @string: a text string that might contain a Smack label
* @len: the maximum size, or zero if it is NULL terminated.
- * @smack: parsed smack label, or NULL if parse error
+ *
+ * Returns a pointer to the clean label, or NULL
*/
-void smk_parse_smack(const char *string, int len, char *smack)
+char *smk_parse_smack(const char *string, int len)
{
- int found;
+ char *smack;
int i;
- if (len <= 0 || len > SMK_MAXLEN)
- len = SMK_MAXLEN;
-
- for (i = 0, found = 0; i < SMK_LABELLEN; i++) {
- if (found)
- smack[i] = '\0';
- else if (i >= len || string[i] > '~' || string[i] <= ' ' ||
- string[i] == '/' || string[i] == '"' ||
- string[i] == '\\' || string[i] == '\'') {
- smack[i] = '\0';
- found = 1;
- } else
- smack[i] = string[i];
+ if (len <= 0)
+ len = strlen(string) + 1;
+
+ /*
+ * Reserve a leading '-' as an indicator that
+ * this isn't a label, but an option to interfaces
+ * including /smack/cipso and /smack/cipso2
+ */
+ if (string[0] == '-')
+ return NULL;
+
+ for (i = 0; i < len; i++)
+ if (string[i] > '~' || string[i] <= ' ' || string[i] == '/' ||
+ string[i] == '"' || string[i] == '\\' || string[i] == '\'')
+ break;
+
+ if (i == 0 || i >= SMK_LONGLABEL)
+ return NULL;
+
+ smack = kzalloc(i + 1, GFP_KERNEL);
+ if (smack != NULL) {
+ strncpy(smack, string, i + 1);
+ smack[i] = '\0';
}
+ return smack;
+}
+
+/**
+ * smk_netlbl_mls - convert a catset to netlabel mls categories
+ * @catset: the Smack categories
+ * @sap: where to put the netlabel categories
+ *
+ * Allocates and fills attr.mls
+ * Returns 0 on success, error code on failure.
+ */
+int smk_netlbl_mls(int level, char *catset, struct netlbl_lsm_secattr *sap,
+ int len)
+{
+ unsigned char *cp;
+ unsigned char m;
+ int cat;
+ int rc;
+ int byte;
+
+ sap->flags |= NETLBL_SECATTR_MLS_CAT;
+ sap->attr.mls.lvl = level;
+ sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ sap->attr.mls.cat->startbit = 0;
+
+ for (cat = 1, cp = catset, byte = 0; byte < len; cp++, byte++)
+ for (m = 0x80; m != 0; m >>= 1, cat++) {
+ if ((m & *cp) == 0)
+ continue;
+ rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
+ cat, GFP_ATOMIC);
+ if (rc < 0) {
+ netlbl_secattr_catmap_free(sap->attr.mls.cat);
+ return rc;
+ }
+ }
+
+ return 0;
}
/**
struct smack_known *smk_import_entry(const char *string, int len)
{
struct smack_known *skp;
- char smack[SMK_LABELLEN];
+ char *smack;
+ int slen;
+ int rc;
- smk_parse_smack(string, len, smack);
- if (smack[0] == '\0')
+ smack = smk_parse_smack(string, len);
+ if (smack == NULL)
return NULL;
mutex_lock(&smack_known_lock);
skp = smk_find_entry(smack);
+ if (skp != NULL)
+ goto freeout;
- if (skp == NULL) {
- skp = kzalloc(sizeof(struct smack_known), GFP_KERNEL);
- if (skp != NULL) {
- strncpy(skp->smk_known, smack, SMK_MAXLEN);
- skp->smk_secid = smack_next_secid++;
- skp->smk_cipso = NULL;
- INIT_LIST_HEAD(&skp->smk_rules);
- spin_lock_init(&skp->smk_cipsolock);
- mutex_init(&skp->smk_rules_lock);
- /*
- * Make sure that the entry is actually
- * filled before putting it on the list.
- */
- list_add_rcu(&skp->list, &smack_known_list);
- }
- }
+ skp = kzalloc(sizeof(*skp), GFP_KERNEL);
+ if (skp == NULL)
+ goto freeout;
+ skp->smk_known = smack;
+ skp->smk_secid = smack_next_secid++;
+ skp->smk_netlabel.domain = skp->smk_known;
+ skp->smk_netlabel.flags =
+ NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
+ /*
+ * If direct labeling works use it.
+ * Otherwise use mapped labeling.
+ */
+ slen = strlen(smack);
+ if (slen < SMK_CIPSOLEN)
+ rc = smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
+ &skp->smk_netlabel, slen);
+ else
+ rc = smk_netlbl_mls(smack_cipso_mapped, (char *)&skp->smk_secid,
+ &skp->smk_netlabel, sizeof(skp->smk_secid));
+
+ if (rc >= 0) {
+ INIT_LIST_HEAD(&skp->smk_rules);
+ mutex_init(&skp->smk_rules_lock);
+ /*
+ * Make sure that the entry is actually
+ * filled before putting it on the list.
+ */
+ list_add_rcu(&skp->list, &smack_known_list);
+ goto unlockout;
+ }
+ /*
+ * smk_netlbl_mls failed.
+ */
+ kfree(skp);
+ skp = NULL;
+freeout:
+ kfree(smack);
+unlockout:
mutex_unlock(&smack_known_lock);
return skp;
*/
u32 smack_to_secid(const char *smack)
{
- struct smack_known *skp;
+ struct smack_known *skp = smk_find_entry(smack);
- rcu_read_lock();
- list_for_each_entry_rcu(skp, &smack_known_list, list) {
- if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0) {
- rcu_read_unlock();
- return skp->smk_secid;
- }
- }
- rcu_read_unlock();
- return 0;
-}
-
-/**
- * smack_from_cipso - find the Smack label associated with a CIPSO option
- * @level: Bell & LaPadula level from the network
- * @cp: Bell & LaPadula categories from the network
- *
- * This is a simple lookup in the label table.
- *
- * Return the matching label from the label list or NULL.
- */
-char *smack_from_cipso(u32 level, char *cp)
-{
- struct smack_known *kp;
- char *final = NULL;
-
- rcu_read_lock();
- list_for_each_entry(kp, &smack_known_list, list) {
- if (kp->smk_cipso == NULL)
- continue;
-
- spin_lock_bh(&kp->smk_cipsolock);
-
- if (kp->smk_cipso->smk_level == level &&
- memcmp(kp->smk_cipso->smk_catset, cp, SMK_LABELLEN) == 0)
- final = kp->smk_known;
-
- spin_unlock_bh(&kp->smk_cipsolock);
-
- if (final != NULL)
- break;
- }
- rcu_read_unlock();
-
- return final;
-}
-
-/**
- * smack_to_cipso - find the CIPSO option to go with a Smack label
- * @smack: a pointer to the smack label in question
- * @cp: where to put the result
- *
- * Returns zero if a value is available, non-zero otherwise.
- */
-int smack_to_cipso(const char *smack, struct smack_cipso *cp)
-{
- struct smack_known *kp;
- int found = 0;
-
- rcu_read_lock();
- list_for_each_entry_rcu(kp, &smack_known_list, list) {
- if (kp->smk_known == smack ||
- strcmp(kp->smk_known, smack) == 0) {
- found = 1;
- break;
- }
- }
- rcu_read_unlock();
-
- if (found == 0 || kp->smk_cipso == NULL)
- return -ENOENT;
-
- memcpy(cp, kp->smk_cipso, sizeof(struct smack_cipso));
- return 0;
+ if (skp == NULL)
+ return 0;
+ return skp->smk_secid;
}
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / blobdiff