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Diffstat (limited to 'security/smack/smack_lsm.c')
-rw-r--r--security/smack/smack_lsm.c185
1 files changed, 44 insertions, 141 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 5f80075d7713..952b1f41fc78 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -30,7 +30,6 @@
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/pipe_fs_i.h>
-#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <linux/audit.h>
#include <linux/magic.h>
@@ -57,16 +56,23 @@
static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
{
int rc;
- char in[SMK_LABELLEN];
+ char *buffer;
+ char *result = NULL;
if (ip->i_op->getxattr == NULL)
return NULL;
- rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
- if (rc < 0)
+ buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
+ if (buffer == NULL)
return NULL;
- return smk_import(in, rc);
+ rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
+ if (rc > 0)
+ result = smk_import(buffer, rc);
+
+ kfree(buffer);
+
+ return result;
}
/**
@@ -825,7 +831,7 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
* check label validity here so import wont fail on
* post_setxattr
*/
- if (size == 0 || size >= SMK_LABELLEN ||
+ if (size == 0 || size >= SMK_LONGLABEL ||
smk_import(value, size) == NULL)
rc = -EINVAL;
} else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
@@ -1824,65 +1830,6 @@ static char *smack_host_label(struct sockaddr_in *sip)
}
/**
- * smack_set_catset - convert a capset to netlabel mls categories
- * @catset: the Smack categories
- * @sap: where to put the netlabel categories
- *
- * Allocates and fills attr.mls.cat
- */
-static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
-{
- unsigned char *cp;
- unsigned char m;
- int cat;
- int rc;
- int byte;
-
- if (!catset)
- return;
-
- sap->flags |= NETLBL_SECATTR_MLS_CAT;
- sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
- sap->attr.mls.cat->startbit = 0;
-
- for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; 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);
- }
-}
-
-/**
- * smack_to_secattr - fill a secattr from a smack value
- * @smack: the smack value
- * @nlsp: where the result goes
- *
- * Casey says that CIPSO is good enough for now.
- * It can be used to effect.
- * It can also be abused to effect when necessary.
- * Apologies to the TSIG group in general and GW in particular.
- */
-static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
-{
- struct smack_cipso cipso;
- int rc;
-
- nlsp->domain = smack;
- nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
-
- rc = smack_to_cipso(smack, &cipso);
- if (rc == 0) {
- nlsp->attr.mls.lvl = cipso.smk_level;
- smack_set_catset(cipso.smk_catset, nlsp);
- } else {
- nlsp->attr.mls.lvl = smack_cipso_direct;
- smack_set_catset(smack, nlsp);
- }
-}
-
-/**
* smack_netlabel - Set the secattr on a socket
* @sk: the socket
* @labeled: socket label scheme
@@ -1894,8 +1841,8 @@ static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
*/
static int smack_netlabel(struct sock *sk, int labeled)
{
+ struct smack_known *skp;
struct socket_smack *ssp = sk->sk_security;
- struct netlbl_lsm_secattr secattr;
int rc = 0;
/*
@@ -1913,10 +1860,8 @@ static int smack_netlabel(struct sock *sk, int labeled)
labeled == SMACK_UNLABELED_SOCKET)
netlbl_sock_delattr(sk);
else {
- netlbl_secattr_init(&secattr);
- smack_to_secattr(ssp->smk_out, &secattr);
- rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr);
- netlbl_secattr_destroy(&secattr);
+ skp = smk_find_entry(ssp->smk_out);
+ rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
}
bh_unlock_sock(sk);
@@ -1989,7 +1934,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
struct socket *sock;
int rc = 0;
- if (value == NULL || size > SMK_LABELLEN || size == 0)
+ if (value == NULL || size > SMK_LONGLABEL || size == 0)
return -EACCES;
sp = smk_import(value, size);
@@ -2785,7 +2730,7 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
- if (value == NULL || size == 0 || size >= SMK_LABELLEN)
+ if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
return -EINVAL;
if (strcmp(name, "current") != 0)
@@ -2921,10 +2866,9 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
struct socket_smack *ssp)
{
- struct smack_known *skp;
- char smack[SMK_LABELLEN];
+ struct smack_known *kp;
char *sp;
- int pcat;
+ int found = 0;
if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
/*
@@ -2932,59 +2876,27 @@ static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
* If there are flags but no level netlabel isn't
* behaving the way we expect it to.
*
- * Get the categories, if any
+ * Look it up in the label table
* Without guidance regarding the smack value
* for the packet fall back on the network
* ambient value.
*/
- memset(smack, '\0', SMK_LABELLEN);
- if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
- for (pcat = -1;;) {
- pcat = netlbl_secattr_catmap_walk(
- sap->attr.mls.cat, pcat + 1);
- if (pcat < 0)
- break;
- smack_catset_bit(pcat, smack);
- }
- /*
- * If it is CIPSO using smack direct mapping
- * we are already done. WeeHee.
- */
- if (sap->attr.mls.lvl == smack_cipso_direct) {
- /*
- * The label sent is usually on the label list.
- *
- * If it is not we may still want to allow the
- * delivery.
- *
- * If the recipient is accepting all packets
- * because it is using the star ("*") label
- * for SMACK64IPIN provide the web ("@") label
- * so that a directed response will succeed.
- * This is not very correct from a MAC point
- * of view, but gets around the problem that
- * locking prevents adding the newly discovered
- * label to the list.
- * The case where the recipient is not using
- * the star label should obviously fail.
- * The easy way to do this is to provide the
- * star label as the subject label.
- */
- skp = smk_find_entry(smack);
- if (skp != NULL)
- return skp->smk_known;
- if (ssp != NULL &&
- ssp->smk_in == smack_known_star.smk_known)
- return smack_known_web.smk_known;
- return smack_known_star.smk_known;
+ rcu_read_lock();
+ list_for_each_entry(kp, &smack_known_list, list) {
+ if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl)
+ continue;
+ if (memcmp(sap->attr.mls.cat,
+ kp->smk_netlabel.attr.mls.cat,
+ SMK_CIPSOLEN) != 0)
+ continue;
+ found = 1;
+ break;
}
- /*
- * Look it up in the supplied table if it is not
- * a direct mapping.
- */
- sp = smack_from_cipso(sap->attr.mls.lvl, smack);
- if (sp != NULL)
- return sp;
+ rcu_read_unlock();
+
+ if (found)
+ return kp->smk_known;
+
if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
return smack_known_web.smk_known;
return smack_known_star.smk_known;
@@ -3184,11 +3096,13 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
u16 family = sk->sk_family;
+ struct smack_known *skp;
struct socket_smack *ssp = sk->sk_security;
struct netlbl_lsm_secattr secattr;
struct sockaddr_in addr;
struct iphdr *hdr;
char *sp;
+ char *hsp;
int rc;
struct smk_audit_info ad;
#ifdef CONFIG_AUDIT
@@ -3235,16 +3149,14 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
hdr = ip_hdr(skb);
addr.sin_addr.s_addr = hdr->saddr;
rcu_read_lock();
- if (smack_host_label(&addr) == NULL) {
- rcu_read_unlock();
- netlbl_secattr_init(&secattr);
- smack_to_secattr(sp, &secattr);
- rc = netlbl_req_setattr(req, &secattr);
- netlbl_secattr_destroy(&secattr);
- } else {
- rcu_read_unlock();
+ hsp = smack_host_label(&addr);
+ rcu_read_unlock();
+
+ if (hsp == NULL) {
+ skp = smk_find_entry(sp);
+ rc = netlbl_req_setattr(req, &skp->smk_netlabel);
+ } else
netlbl_req_delattr(req);
- }
return rc;
}
@@ -3669,15 +3581,6 @@ struct security_operations smack_ops = {
static __init void init_smack_known_list(void)
{
/*
- * Initialize CIPSO locks
- */
- spin_lock_init(&smack_known_huh.smk_cipsolock);
- spin_lock_init(&smack_known_hat.smk_cipsolock);
- spin_lock_init(&smack_known_star.smk_cipsolock);
- spin_lock_init(&smack_known_floor.smk_cipsolock);
- spin_lock_init(&smack_known_invalid.smk_cipsolock);
- spin_lock_init(&smack_known_web.smk_cipsolock);
- /*
* Initialize rule list locks
*/
mutex_init(&smack_known_huh.smk_rules_lock);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-05 01:08:23 +0000