int (*unix_may_send) (struct socket * sock, struct socket * other);
int (*socket_create) (int family, int type, int protocol, int kern);
- void (*socket_post_create) (struct socket * sock, int family,
- int type, int protocol, int kern);
+ int (*socket_post_create) (struct socket * sock, int family,
+ int type, int protocol, int kern);
int (*socket_bind) (struct socket * sock,
struct sockaddr * address, int addrlen);
int (*socket_connect) (struct socket * sock,
return security_ops->socket_create(family, type, protocol, kern);
}
-static inline void security_socket_post_create(struct socket * sock,
- int family,
- int type,
- int protocol, int kern)
+static inline int security_socket_post_create(struct socket * sock,
+ int family,
+ int type,
+ int protocol, int kern)
{
- security_ops->socket_post_create(sock, family, type,
- protocol, kern);
+ return security_ops->socket_post_create(sock, family, type,
+ protocol, kern);
}
static inline int security_socket_bind(struct socket * sock,
return 0;
}
-static inline void security_socket_post_create(struct socket * sock,
- int family,
- int type,
- int protocol, int kern)
+static inline int security_socket_post_create(struct socket * sock,
+ int family,
+ int type,
+ int protocol, int kern)
{
+ return 0;
}
static inline int security_socket_bind(struct socket * sock,
goto out;
}
- security_socket_post_create(sock, family, type, protocol, 1);
sock->type = type;
+ err = security_socket_post_create(sock, family, type, protocol, 1);
+ if (err)
+ goto out_release;
+
out:
*res = sock;
return err;
+out_release:
+ sock_release(sock);
+ sock = NULL;
+ goto out;
}
/* No kernel lock held - perfect */
*/
module_put(net_families[family]->owner);
*res = sock;
- security_socket_post_create(sock, family, type, protocol, kern);
+ err = security_socket_post_create(sock, family, type, protocol, kern);
+ if (err)
+ goto out_release;
out:
net_family_read_unlock();
return 0;
}
-static void dummy_socket_post_create (struct socket *sock, int family, int type,
- int protocol, int kern)
+static int dummy_socket_post_create (struct socket *sock, int family, int type,
+ int protocol, int kern)
{
- return;
+ return 0;
}
static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
* Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
* Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
* <dgoeddel@trustedcs.com>
+ * Copyright (C) 2006 Hewlett-Packard Development Company, L.P.
+ * Paul Moore, <paul.moore@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2,
#include "objsec.h"
#include "netif.h"
#include "xfrm.h"
+#include "selinux_netlabel.h"
#define XATTR_SELINUX_SUFFIX "selinux"
#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
static int selinux_file_permission(struct file *file, int mask)
{
+ int rc;
struct inode *inode = file->f_dentry->d_inode;
if (!mask) {
if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
mask |= MAY_APPEND;
- return file_has_perm(current, file,
- file_mask_to_av(inode->i_mode, mask));
+ rc = file_has_perm(current, file,
+ file_mask_to_av(inode->i_mode, mask));
+ if (rc)
+ return rc;
+
+ return selinux_netlbl_inode_permission(inode, mask);
}
static int selinux_file_alloc_security(struct file *file)
return err;
}
-static void selinux_socket_post_create(struct socket *sock, int family,
- int type, int protocol, int kern)
+static int selinux_socket_post_create(struct socket *sock, int family,
+ int type, int protocol, int kern)
{
+ int err = 0;
struct inode_security_struct *isec;
struct task_security_struct *tsec;
struct sk_security_struct *sksec;
if (sock->sk) {
sksec = sock->sk->sk_security;
sksec->sid = isec->sid;
+ err = selinux_netlbl_socket_post_create(sock,
+ family,
+ isec->sid);
}
- return;
+ return err;
}
/* Range of port numbers used to automatically bind.
static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
int size)
{
- return socket_has_perm(current, sock, SOCKET__WRITE);
+ int rc;
+
+ rc = socket_has_perm(current, sock, SOCKET__WRITE);
+ if (rc)
+ return rc;
+
+ return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE);
}
static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
if (err)
goto out;
+ err = selinux_netlbl_sock_rcv_skb(sksec, skb, &ad);
+ if (err)
+ goto out;
+
err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
out:
return err;
peer_sid = ssec->peer_sid;
}
else if (isec->sclass == SECCLASS_TCP_SOCKET) {
- peer_sid = selinux_socket_getpeer_stream(sock->sk);
-
+ peer_sid = selinux_netlbl_socket_getpeersec_stream(sock);
+ if (peer_sid == SECSID_NULL)
+ peer_sid = selinux_socket_getpeer_stream(sock->sk);
if (peer_sid == SECSID_NULL) {
err = -ENOPROTOOPT;
goto out;
if (sock && (sock->sk->sk_family == PF_UNIX))
selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
- else if (skb)
- peer_secid = selinux_socket_getpeer_dgram(skb);
+ else if (skb) {
+ peer_secid = selinux_netlbl_socket_getpeersec_dgram(skb);
+ if (peer_secid == SECSID_NULL)
+ peer_secid = selinux_socket_getpeer_dgram(skb);
+ }
if (peer_secid == SECSID_NULL)
err = -EINVAL;
struct sk_security_struct *sksec = sk->sk_security;
isec->sid = sksec->sid;
+
+ selinux_netlbl_sock_graft(sk, parent);
}
int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
{
struct sk_security_struct *sksec = sk->sk_security;
int err;
- u32 newsid = 0;
+ u32 newsid;
u32 peersid;
+ newsid = selinux_netlbl_inet_conn_request(skb, sksec->sid);
+ if (newsid != SECSID_NULL) {
+ req->secid = newsid;
+ return 0;
+ }
+
err = selinux_xfrm_decode_session(skb, &peersid, 0);
BUG_ON(err);
struct sock *sk; /* back pointer to sk object */
u32 sid; /* SID of this object */
u32 peer_sid; /* SID of peer */
+#ifdef CONFIG_NETLABEL
+ u16 sclass; /* sock security class */
+ enum { /* NetLabel state */
+ NLBL_UNSET = 0,
+ NLBL_REQUIRE,
+ NLBL_LABELED,
+ } nlbl_state;
+#endif
};
struct key_security_struct {
--- /dev/null
+/*
+ * SELinux interface to the NetLabel subsystem
+ *
+ * Author : Paul Moore <paul.moore@hp.com>
+ *
+ */
+
+/*
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef _SELINUX_NETLABEL_H_
+#define _SELINUX_NETLABEL_H_
+
+#ifdef CONFIG_NETLABEL
+void selinux_netlbl_cache_invalidate(void);
+int selinux_netlbl_socket_post_create(struct socket *sock,
+ int sock_family,
+ u32 sid);
+void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock);
+u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb, u32 sock_sid);
+int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
+ struct sk_buff *skb,
+ struct avc_audit_data *ad);
+u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock);
+u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb);
+
+int __selinux_netlbl_inode_permission(struct inode *inode, int mask);
+/**
+ * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled
+ * @inode: the file descriptor's inode
+ * @mask: the permission mask
+ *
+ * Description:
+ * Looks at a file's inode and if it is marked as a socket protected by
+ * NetLabel then verify that the socket has been labeled, if not try to label
+ * the socket now with the inode's SID. Returns zero on success, negative
+ * values on failure.
+ *
+ */
+static inline int selinux_netlbl_inode_permission(struct inode *inode,
+ int mask)
+{
+ int rc = 0;
+ struct inode_security_struct *isec;
+ struct sk_security_struct *sksec;
+
+ if (!S_ISSOCK(inode->i_mode))
+ return 0;
+
+ isec = inode->i_security;
+ sksec = SOCKET_I(inode)->sk->sk_security;
+ down(&isec->sem);
+ if (unlikely(sksec->nlbl_state == NLBL_REQUIRE &&
+ (mask & (MAY_WRITE | MAY_APPEND))))
+ rc = __selinux_netlbl_inode_permission(inode, mask);
+ up(&isec->sem);
+
+ return rc;
+}
+#else
+static inline void selinux_netlbl_cache_invalidate(void)
+{
+ return;
+}
+
+static inline int selinux_netlbl_socket_post_create(struct socket *sock,
+ int sock_family,
+ u32 sid)
+{
+ return 0;
+}
+
+static inline void selinux_netlbl_sock_graft(struct sock *sk,
+ struct socket *sock)
+{
+ return;
+}
+
+static inline u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb,
+ u32 sock_sid)
+{
+ return SECSID_NULL;
+}
+
+static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
+ struct sk_buff *skb,
+ struct avc_audit_data *ad)
+{
+ return 0;
+}
+
+static inline u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock)
+{
+ return SECSID_NULL;
+}
+
+static inline u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb)
+{
+ return SECSID_NULL;
+}
+
+static inline int selinux_netlbl_inode_permission(struct inode *inode,
+ int mask)
+{
+ return 0;
+}
+#endif /* CONFIG_NETLABEL */
+
+#endif
*
* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
*/
+/*
+ * Updated: Hewlett-Packard <paul.moore@hp.com>
+ *
+ * Added ebitmap_export() and ebitmap_import()
+ *
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ */
+
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
return 0;
}
+/**
+ * ebitmap_export - Export an ebitmap to a unsigned char bitmap string
+ * @src: the ebitmap to export
+ * @dst: the resulting bitmap string
+ * @dst_len: length of dst in bytes
+ *
+ * Description:
+ * Allocate a buffer at least src->highbit bits long and export the extensible
+ * bitmap into the buffer. The bitmap string will be in little endian format,
+ * i.e. LSB first. The value returned in dst_len may not the true size of the
+ * buffer as the length of the buffer is rounded up to a multiple of MAPTYPE.
+ * The caller must free the buffer when finished. Returns zero on success,
+ * negative values on failure.
+ *
+ */
+int ebitmap_export(const struct ebitmap *src,
+ unsigned char **dst,
+ size_t *dst_len)
+{
+ size_t bitmap_len;
+ unsigned char *bitmap;
+ struct ebitmap_node *iter_node;
+ MAPTYPE node_val;
+ size_t bitmap_byte;
+ unsigned char bitmask;
+
+ bitmap_len = src->highbit / 8;
+ if (src->highbit % 7)
+ bitmap_len += 1;
+ if (bitmap_len == 0)
+ return -EINVAL;
+
+ bitmap = kzalloc((bitmap_len & ~(sizeof(MAPTYPE) - 1)) +
+ sizeof(MAPTYPE),
+ GFP_ATOMIC);
+ if (bitmap == NULL)
+ return -ENOMEM;
+
+ iter_node = src->node;
+ do {
+ bitmap_byte = iter_node->startbit / 8;
+ bitmask = 0x80;
+ node_val = iter_node->map;
+ do {
+ if (bitmask == 0) {
+ bitmap_byte++;
+ bitmask = 0x80;
+ }
+ if (node_val & (MAPTYPE)0x01)
+ bitmap[bitmap_byte] |= bitmask;
+ node_val >>= 1;
+ bitmask >>= 1;
+ } while (node_val > 0);
+ iter_node = iter_node->next;
+ } while (iter_node);
+
+ *dst = bitmap;
+ *dst_len = bitmap_len;
+ return 0;
+}
+
+/**
+ * ebitmap_import - Import an unsigned char bitmap string into an ebitmap
+ * @src: the bitmap string
+ * @src_len: the bitmap length in bytes
+ * @dst: the empty ebitmap
+ *
+ * Description:
+ * This function takes a little endian bitmap string in src and imports it into
+ * the ebitmap pointed to by dst. Returns zero on success, negative values on
+ * failure.
+ *
+ */
+int ebitmap_import(const unsigned char *src,
+ size_t src_len,
+ struct ebitmap *dst)
+{
+ size_t src_off = 0;
+ struct ebitmap_node *node_new;
+ struct ebitmap_node *node_last = NULL;
+ size_t iter;
+ size_t iter_bit;
+ size_t iter_limit;
+ unsigned char src_byte;
+
+ do {
+ iter_limit = src_len - src_off;
+ if (iter_limit >= sizeof(MAPTYPE)) {
+ if (*(MAPTYPE *)&src[src_off] == 0) {
+ src_off += sizeof(MAPTYPE);
+ continue;
+ }
+ iter_limit = sizeof(MAPTYPE);
+ } else {
+ iter = src_off;
+ src_byte = 0;
+ do {
+ src_byte |= src[iter++];
+ } while (iter < src_len && src_byte == 0);
+ if (src_byte == 0)
+ break;
+ }
+
+ node_new = kzalloc(sizeof(*node_new), GFP_ATOMIC);
+ if (unlikely(node_new == NULL)) {
+ ebitmap_destroy(dst);
+ return -ENOMEM;
+ }
+ node_new->startbit = src_off * 8;
+ iter = 0;
+ do {
+ src_byte = src[src_off++];
+ iter_bit = iter++ * 8;
+ while (src_byte != 0) {
+ if (src_byte & 0x80)
+ node_new->map |= MAPBIT << iter_bit;
+ iter_bit++;
+ src_byte <<= 1;
+ }
+ } while (iter < iter_limit);
+
+ if (node_last != NULL)
+ node_last->next = node_new;
+ else
+ dst->node = node_new;
+ node_last = node_new;
+ } while (src_off < src_len);
+
+ if (likely(node_last != NULL))
+ dst->highbit = node_last->startbit + MAPSIZE;
+ else
+ ebitmap_init(dst);
+
+ return 0;
+}
+
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
{
struct ebitmap_node *n1, *n2;
int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2);
int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src);
+int ebitmap_export(const struct ebitmap *src,
+ unsigned char **dst,
+ size_t *dst_len);
+int ebitmap_import(const unsigned char *src,
+ size_t src_len,
+ struct ebitmap *dst);
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2);
int ebitmap_get_bit(struct ebitmap *e, unsigned long bit);
int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value);
*
* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
*/
+/*
+ * Updated: Hewlett-Packard <paul.moore@hp.com>
+ *
+ * Added support to import/export the MLS label
+ *
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ */
#include <linux/kernel.h>
#include <linux/slab.h>
return -EINVAL;
}
+/**
+ * mls_export_lvl - Export the MLS sensitivity levels
+ * @context: the security context
+ * @low: the low sensitivity level
+ * @high: the high sensitivity level
+ *
+ * Description:
+ * Given the security context copy the low MLS sensitivity level into lvl_low
+ * and the high sensitivity level in lvl_high. The MLS levels are only
+ * exported if the pointers are not NULL, if they are NULL then that level is
+ * not exported.
+ *
+ */
+void mls_export_lvl(const struct context *context, u32 *low, u32 *high)
+{
+ if (!selinux_mls_enabled)
+ return;
+
+ if (low != NULL)
+ *low = context->range.level[0].sens - 1;
+ if (high != NULL)
+ *high = context->range.level[1].sens - 1;
+}
+
+/**
+ * mls_import_lvl - Import the MLS sensitivity levels
+ * @context: the security context
+ * @low: the low sensitivity level
+ * @high: the high sensitivity level
+ *
+ * Description:
+ * Given the security context and the two sensitivty levels, set the MLS levels
+ * in the context according the two given as parameters. Returns zero on
+ * success, negative values on failure.
+ *
+ */
+void mls_import_lvl(struct context *context, u32 low, u32 high)
+{
+ if (!selinux_mls_enabled)
+ return;
+
+ context->range.level[0].sens = low + 1;
+ context->range.level[1].sens = high + 1;
+}
+
+/**
+ * mls_export_cat - Export the MLS categories
+ * @context: the security context
+ * @low: the low category
+ * @low_len: length of the cat_low bitmap in bytes
+ * @high: the high category
+ * @high_len: length of the cat_high bitmap in bytes
+ *
+ * Description:
+ * Given the security context export the low MLS category bitmap into cat_low
+ * and the high category bitmap into cat_high. The MLS categories are only
+ * exported if the pointers are not NULL, if they are NULL then that level is
+ * not exported. The caller is responsibile for freeing the memory when
+ * finished. Returns zero on success, negative values on failure.
+ *
+ */
+int mls_export_cat(const struct context *context,
+ unsigned char **low,
+ size_t *low_len,
+ unsigned char **high,
+ size_t *high_len)
+{
+ int rc = -EPERM;
+
+ if (!selinux_mls_enabled)
+ return 0;
+
+ if (low != NULL) {
+ rc = ebitmap_export(&context->range.level[0].cat,
+ low,
+ low_len);
+ if (rc != 0)
+ goto export_cat_failure;
+ }
+ if (high != NULL) {
+ rc = ebitmap_export(&context->range.level[1].cat,
+ high,
+ high_len);
+ if (rc != 0)
+ goto export_cat_failure;
+ }
+
+ return 0;
+
+export_cat_failure:
+ if (low != NULL)
+ kfree(*low);
+ if (high != NULL)
+ kfree(*high);
+ return rc;
+}
+
+/**
+ * mls_import_cat - Import the MLS categories
+ * @context: the security context
+ * @low: the low category
+ * @low_len: length of the cat_low bitmap in bytes
+ * @high: the high category
+ * @high_len: length of the cat_high bitmap in bytes
+ *
+ * Description:
+ * Given the security context and the two category bitmap strings import the
+ * categories into the security context. The MLS categories are only imported
+ * if the pointers are not NULL, if they are NULL they are skipped. Returns
+ * zero on success, negative values on failure.
+ *
+ */
+int mls_import_cat(struct context *context,
+ const unsigned char *low,
+ size_t low_len,
+ const unsigned char *high,
+ size_t high_len)
+{
+ int rc = -EPERM;
+
+ if (!selinux_mls_enabled)
+ return 0;
+
+ if (low != NULL) {
+ rc = ebitmap_import(low,
+ low_len,
+ &context->range.level[0].cat);
+ if (rc != 0)
+ goto import_cat_failure;
+ }
+ if (high != NULL) {
+ if (high == low)
+ rc = ebitmap_cpy(&context->range.level[1].cat,
+ &context->range.level[0].cat);
+ else
+ rc = ebitmap_import(high,
+ high_len,
+ &context->range.level[1].cat);
+ if (rc != 0)
+ goto import_cat_failure;
+ }
+
+ return 0;
+
+import_cat_failure:
+ ebitmap_destroy(&context->range.level[0].cat);
+ ebitmap_destroy(&context->range.level[1].cat);
+ return rc;
+}
*
* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
*/
+/*
+ * Updated: Hewlett-Packard <paul.moore@hp.com>
+ *
+ * Added support to import/export the MLS label
+ *
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ */
#ifndef _SS_MLS_H_
#define _SS_MLS_H_
int mls_setup_user_range(struct context *fromcon, struct user_datum *user,
struct context *usercon);
+void mls_export_lvl(const struct context *context, u32 *low, u32 *high);
+void mls_import_lvl(struct context *context, u32 low, u32 high);
+
+int mls_export_cat(const struct context *context,
+ unsigned char **low,
+ size_t *low_len,
+ unsigned char **high,
+ size_t *high_len);
+int mls_import_cat(struct context *context,
+ const unsigned char *low,
+ size_t low_len,
+ const unsigned char *high,
+ size_t high_len);
+
#endif /* _SS_MLS_H */
*
* Added conditional policy language extensions
*
+ * Updated: Hewlett-Packard <paul.moore@hp.com>
+ *
+ * Added support for NetLabel
+ *
+ * Copyright (C) 2006 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
* Copyright (C) 2003 - 2004 Tresys Technology, LLC
* Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
#include <linux/sched.h>
#include <linux/audit.h>
#include <linux/mutex.h>
+#include <net/sock.h>
+#include <net/netlabel.h>
#include "flask.h"
#include "avc.h"
#include "services.h"
#include "conditional.h"
#include "mls.h"
+#include "objsec.h"
+#include "selinux_netlabel.h"
extern void selnl_notify_policyload(u32 seqno);
unsigned int policydb_loaded_version;
selinux_complete_init();
avc_ss_reset(seqno);
selnl_notify_policyload(seqno);
+ selinux_netlbl_cache_invalidate();
return 0;
}
avc_ss_reset(seqno);
selnl_notify_policyload(seqno);
+ selinux_netlbl_cache_invalidate();
return 0;
{
aurule_callback = callback;
}
+
+#ifdef CONFIG_NETLABEL
+/*
+ * This is the structure we store inside the NetLabel cache block.
+ */
+#define NETLBL_CACHE(x) ((struct netlbl_cache *)(x))
+#define NETLBL_CACHE_T_NONE 0
+#define NETLBL_CACHE_T_SID 1
+#define NETLBL_CACHE_T_MLS 2
+struct netlbl_cache {
+ u32 type;
+ union {
+ u32 sid;
+ struct mls_range mls_label;
+ } data;
+};
+
+/**
+ * selinux_netlbl_cache_free - Free the NetLabel cached data
+ * @data: the data to free
+ *
+ * Description:
+ * This function is intended to be used as the free() callback inside the
+ * netlbl_lsm_cache structure.
+ *
+ */
+static void selinux_netlbl_cache_free(const void *data)
+{
+ struct netlbl_cache *cache = NETLBL_CACHE(data);
+ switch (cache->type) {
+ case NETLBL_CACHE_T_MLS:
+ ebitmap_destroy(&cache->data.mls_label.level[0].cat);
+ break;
+ }
+ kfree(data);
+}
+
+/**
+ * selinux_netlbl_cache_add - Add an entry to the NetLabel cache
+ * @skb: the packet
+ * @ctx: the SELinux context
+ *
+ * Description:
+ * Attempt to cache the context in @ctx, which was derived from the packet in
+ * @skb, in the NetLabel subsystem cache.
+ *
+ */
+static void selinux_netlbl_cache_add(struct sk_buff *skb, struct context *ctx)
+{
+ struct netlbl_cache *cache = NULL;
+ struct netlbl_lsm_secattr secattr;
+
+ netlbl_secattr_init(&secattr);
+
+ cache = kzalloc(sizeof(*cache), GFP_ATOMIC);
+ if (cache == NULL)
+ goto netlbl_cache_add_failure;
+ secattr.cache.free = selinux_netlbl_cache_free;
+ secattr.cache.data = (void *)cache;
+
+ cache->type = NETLBL_CACHE_T_MLS;
+ if (ebitmap_cpy(&cache->data.mls_label.level[0].cat,
+ &ctx->range.level[0].cat) != 0)
+ goto netlbl_cache_add_failure;
+ cache->data.mls_label.level[1].cat.highbit =
+ cache->data.mls_label.level[0].cat.highbit;
+ cache->data.mls_label.level[1].cat.node =
+ cache->data.mls_label.level[0].cat.node;
+ cache->data.mls_label.level[0].sens = ctx->range.level[0].sens;
+ cache->data.mls_label.level[1].sens = ctx->range.level[0].sens;
+
+ if (netlbl_cache_add(skb, &secattr) != 0)
+ goto netlbl_cache_add_failure;
+
+ return;
+
+netlbl_cache_add_failure:
+ netlbl_secattr_destroy(&secattr, 1);
+}
+
+/**
+ * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
+ *
+ * Description:
+ * Invalidate the NetLabel security attribute mapping cache.
+ *
+ */
+void selinux_netlbl_cache_invalidate(void)
+{
+ netlbl_cache_invalidate();
+}
+
+/**
+ * selinux_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
+ * @skb: the network packet
+ * @secattr: the NetLabel packet security attributes
+ * @base_sid: the SELinux SID to use as a context for MLS only attributes
+ * @sid: the SELinux SID
+ *
+ * Description:
+ * Convert the given NetLabel packet security attributes in @secattr into a
+ * SELinux SID. If the @secattr field does not contain a full SELinux
+ * SID/context then use the context in @base_sid as the foundation. If @skb
+ * is not NULL attempt to cache as much data as possibile. Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb,
+ struct netlbl_lsm_secattr *secattr,
+ u32 base_sid,
+ u32 *sid)
+{
+ int rc = -EIDRM;
+ struct context *ctx;
+ struct context ctx_new;
+ struct netlbl_cache *cache;
+
+ POLICY_RDLOCK;
+
+ if (secattr->cache.data) {
+ cache = NETLBL_CACHE(secattr->cache.data);
+ switch (cache->type) {
+ case NETLBL_CACHE_T_SID:
+ *sid = cache->data.sid;
+ rc = 0;
+ break;
+ case NETLBL_CACHE_T_MLS:
+ ctx = sidtab_search(&sidtab, base_sid);
+ if (ctx == NULL)
+ goto netlbl_secattr_to_sid_return;
+
+ ctx_new.user = ctx->user;
+ ctx_new.role = ctx->role;
+ ctx_new.type = ctx->type;
+ ctx_new.range.level[0].sens =
+ cache->data.mls_label.level[0].sens;
+ ctx_new.range.level[0].cat.highbit =
+ cache->data.mls_label.level[0].cat.highbit;
+ ctx_new.range.level[0].cat.node =
+ cache->data.mls_label.level[0].cat.node;
+ ctx_new.range.level[1].sens =
+ cache->data.mls_label.level[1].sens;
+ ctx_new.range.level[1].cat.highbit =
+ cache->data.mls_label.level[1].cat.highbit;
+ ctx_new.range.level[1].cat.node =
+ cache->data.mls_label.level[1].cat.node;
+
+ rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);
+ break;
+ default:
+ goto netlbl_secattr_to_sid_return;
+ }
+ } else if (secattr->mls_lvl_vld) {
+ ctx = sidtab_search(&sidtab, base_sid);
+ if (ctx == NULL)
+ goto netlbl_secattr_to_sid_return;
+
+ ctx_new.user = ctx->user;
+ ctx_new.role = ctx->role;
+ ctx_new.type = ctx->type;
+ mls_import_lvl(&ctx_new, secattr->mls_lvl, secattr->mls_lvl);
+ if (secattr->mls_cat) {
+ if (mls_import_cat(&ctx_new,
+ secattr->mls_cat,
+ secattr->mls_cat_len,
+ NULL,
+ 0) != 0)
+ goto netlbl_secattr_to_sid_return;
+ ctx_new.range.level[1].cat.highbit =
+ ctx_new.range.level[0].cat.highbit;
+ ctx_new.range.level[1].cat.node =
+ ctx_new.range.level[0].cat.node;
+ } else {
+ ebitmap_init(&ctx_new.range.level[0].cat);
+ ebitmap_init(&ctx_new.range.level[1].cat);
+ }
+ if (mls_context_isvalid(&policydb, &ctx_new) != 1)
+ goto netlbl_secattr_to_sid_return_cleanup;
+
+ rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);
+ if (rc != 0)
+ goto netlbl_secattr_to_sid_return_cleanup;
+
+ if (skb != NULL)
+ selinux_netlbl_cache_add(skb, &ctx_new);
+ ebitmap_destroy(&ctx_new.range.level[0].cat);
+ } else {
+ *sid = SECINITSID_UNLABELED;
+ rc = 0;
+ }
+
+netlbl_secattr_to_sid_return:
+ POLICY_RDUNLOCK;
+ return rc;
+netlbl_secattr_to_sid_return_cleanup:
+ ebitmap_destroy(&ctx_new.range.level[0].cat);
+ goto netlbl_secattr_to_sid_return;
+}
+
+/**
+ * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
+ * @skb: the packet
+ * @base_sid: the SELinux SID to use as a context for MLS only attributes
+ * @sid: the SID
+ *
+ * Description:
+ * Call the NetLabel mechanism to get the security attributes of the given
+ * packet and use those attributes to determine the correct context/SID to
+ * assign to the packet. Returns zero on success, negative values on failure.
+ *
+ */
+static int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+ u32 base_sid,
+ u32 *sid)
+{
+ int rc;
+ struct netlbl_lsm_secattr secattr;
+
+ netlbl_secattr_init(&secattr);
+ rc = netlbl_skbuff_getattr(skb, &secattr);
+ if (rc == 0)
+ rc = selinux_netlbl_secattr_to_sid(skb,
+ &secattr,
+ base_sid,
+ sid);
+ netlbl_secattr_destroy(&secattr, 0);
+
+ return rc;
+}
+
+/**
+ * selinux_netlbl_socket_setsid - Label a socket using the NetLabel mechanism
+ * @sock: the socket to label
+ * @sid: the SID to use
+ *
+ * Description:
+ * Attempt to label a socket using the NetLabel mechanism using the given
+ * SID. Returns zero values on success, negative values on failure.
+ *
+ */
+static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid)
+{
+ int rc = -ENOENT;
+ struct sk_security_struct *sksec = sock->sk->sk_security;
+ struct netlbl_lsm_secattr secattr;
+ struct context *ctx;
+
+ if (!ss_initialized)
+ return 0;
+
+ POLICY_RDLOCK;
+
+ ctx = sidtab_search(&sidtab, sid);
+ if (ctx == NULL)
+ goto netlbl_socket_setsid_return;
+
+ netlbl_secattr_init(&secattr);
+ secattr.domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1],
+ GFP_ATOMIC);
+ mls_export_lvl(ctx, &secattr.mls_lvl, NULL);
+ secattr.mls_lvl_vld = 1;
+ mls_export_cat(ctx,
+ &secattr.mls_cat,
+ &secattr.mls_cat_len,
+ NULL,
+ NULL);
+
+ rc = netlbl_socket_setattr(sock, &secattr);
+ if (rc == 0)
+ sksec->nlbl_state = NLBL_LABELED;
+
+ netlbl_secattr_destroy(&secattr, 0);
+
+netlbl_socket_setsid_return:
+ POLICY_RDUNLOCK;
+ return rc;
+}
+
+/**
+ * selinux_netlbl_socket_post_create - Label a socket using NetLabel
+ * @sock: the socket to label
+ * @sock_family: the socket family
+ * @sid: the SID to use
+ *
+ * Description:
+ * Attempt to label a socket using the NetLabel mechanism using the given
+ * SID. Returns zero values on success, negative values on failure.
+ *
+ */
+int selinux_netlbl_socket_post_create(struct socket *sock,
+ int sock_family,
+ u32 sid)
+{
+ struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
+ struct sk_security_struct *sksec = sock->sk->sk_security;
+
+ if (sock_family != PF_INET)
+ return 0;
+
+ sksec->sclass = isec->sclass;
+ sksec->nlbl_state = NLBL_REQUIRE;
+ return selinux_netlbl_socket_setsid(sock, sid);
+}
+
+/**
+ * selinux_netlbl_sock_graft - Netlabel the new socket
+ * @sk: the new connection
+ * @sock: the new socket
+ *
+ * Description:
+ * The connection represented by @sk is being grafted onto @sock so set the
+ * socket's NetLabel to match the SID of @sk.
+ *
+ */
+void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
+{
+ struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
+ struct sk_security_struct *sksec = sk->sk_security;
+
+ if (sk->sk_family != PF_INET)
+ return;
+
+ sksec->nlbl_state = NLBL_REQUIRE;
+ sksec->peer_sid = sksec->sid;
+ sksec->sclass = isec->sclass;
+
+ /* Try to set the NetLabel on the socket to save time later, if we fail
+ * here we will pick up the pieces in later calls to
+ * selinux_netlbl_inode_permission(). */
+ selinux_netlbl_socket_setsid(sock, sksec->sid);
+}
+
+/**
+ * selinux_netlbl_inet_conn_request - Handle a new connection request
+ * @skb: the packet
+ * @sock_sid: the SID of the parent socket
+ *
+ * Description:
+ * If present, use the security attributes of the packet in @skb and the
+ * parent sock's SID to arrive at a SID for the new child sock. Returns the
+ * SID of the connection or SECSID_NULL on failure.
+ *
+ */
+u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb, u32 sock_sid)
+{
+ int rc;
+ u32 peer_sid;
+
+ rc = selinux_netlbl_skbuff_getsid(skb, sock_sid, &peer_sid);
+ if (rc != 0)
+ return SECSID_NULL;
+
+ if (peer_sid == SECINITSID_UNLABELED)
+ return SECSID_NULL;
+
+ return peer_sid;
+}
+
+/**
+ * __selinux_netlbl_inode_permission - Label a socket using NetLabel
+ * @inode: the file descriptor's inode
+ * @mask: the permission mask
+ *
+ * Description:
+ * Try to label a socket with the inode's SID using NetLabel. Returns zero on
+ * success, negative values on failure.
+ *
+ */
+int __selinux_netlbl_inode_permission(struct inode *inode, int mask)
+{
+ int rc;
+ struct socket *sock = SOCKET_I(inode);
+ struct sk_security_struct *sksec = sock->sk->sk_security;
+
+ lock_sock(sock->sk);
+ rc = selinux_netlbl_socket_setsid(sock, sksec->sid);
+ release_sock(sock->sk);
+
+ return rc;
+}
+
+/**
+ * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
+ * @sksec: the sock's sk_security_struct
+ * @skb: the packet
+ * @ad: the audit data
+ *
+ * Description:
+ * Fetch the NetLabel security attributes from @skb and perform an access check
+ * against the receiving socket. Returns zero on success, negative values on
+ * error.
+ *
+ */
+int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
+ struct sk_buff *skb,
+ struct avc_audit_data *ad)
+{
+ int rc;
+ u32 netlbl_sid;
+ u32 recv_perm;
+
+ rc = selinux_netlbl_skbuff_getsid(skb, sksec->sid, &netlbl_sid);
+ if (rc != 0)
+ return rc;
+
+ if (netlbl_sid == SECINITSID_UNLABELED)
+ return 0;
+
+ switch (sksec->sclass) {
+ case SECCLASS_UDP_SOCKET:
+ recv_perm = UDP_SOCKET__RECV_MSG;
+ break;
+ case SECCLASS_TCP_SOCKET:
+ recv_perm = TCP_SOCKET__RECV_MSG;
+ break;
+ default:
+ recv_perm = RAWIP_SOCKET__RECV_MSG;
+ }
+
+ rc = avc_has_perm(sksec->sid,
+ netlbl_sid,
+ sksec->sclass,
+ recv_perm,
+ ad);
+ if (rc == 0)
+ return 0;
+
+ netlbl_skbuff_err(skb, rc);
+ return rc;
+}
+
+/**
+ * selinux_netlbl_socket_peersid - Return the peer SID of a connected socket
+ * @sock: the socket
+ *
+ * Description:
+ * Examine @sock to find the connected peer's SID. Returns the SID on success
+ * or SECSID_NULL on error.
+ *
+ */
+u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock)
+{
+ struct sk_security_struct *sksec = sock->sk->sk_security;
+
+ if (sksec->peer_sid == SECINITSID_UNLABELED)
+ return SECSID_NULL;
+
+ return sksec->peer_sid;
+}
+
+/**
+ * selinux_netlbl_socket_getpeersec_dgram - Return the SID of a NetLabel packet
+ * @skb: the packet
+ *
+ * Description:
+ * Examine @skb to find the SID assigned to it by NetLabel. Returns the SID on
+ * success, SECSID_NULL on error.
+ *
+ */
+u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb)
+{
+ int peer_sid;
+ struct sock *sk = skb->sk;
+ struct inode_security_struct *isec;
+
+ if (sk == NULL || sk->sk_socket == NULL)
+ return SECSID_NULL;
+
+ isec = SOCK_INODE(sk->sk_socket)->i_security;
+ if (selinux_netlbl_skbuff_getsid(skb, isec->sid, &peer_sid) != 0)
+ return SECSID_NULL;
+ if (peer_sid == SECINITSID_UNLABELED)
+ return SECSID_NULL;
+
+ return peer_sid;
+}
+#endif /* CONFIG_NETLABEL */
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff