*/
/*
- * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
*
* 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
#include <linux/init.h>
#include <linux/types.h>
+#include <linux/audit.h>
#include <net/ip.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <asm/bug.h>
+#include <asm/atomic.h>
#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
+#include "netlabel_cipso_v4.h"
#include "netlabel_user.h"
+#include "netlabel_mgmt.h"
+
+/*
+ * Configuration Functions
+ */
+
+/**
+ * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
+ * @domain: the domain mapping to remove
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
+ * default domain mapping to be removed. Returns zero on success, negative
+ * values on failure.
+ *
+ */
+int netlbl_cfg_map_del(const char *domain, struct netlbl_audit *audit_info)
+{
+ return netlbl_domhsh_remove(domain, audit_info);
+}
+
+/**
+ * netlbl_cfg_unlbl_add_map - Add an unlabeled NetLabel/LSM domain mapping
+ * @domain: the domain mapping to add
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
+ * causes a new default domain mapping to be added. Returns zero on success,
+ * negative values on failure.
+ *
+ */
+int netlbl_cfg_unlbl_add_map(const char *domain,
+ struct netlbl_audit *audit_info)
+{
+ int ret_val = -ENOMEM;
+ struct netlbl_dom_map *entry;
+
+ entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+ if (entry == NULL)
+ return -ENOMEM;
+ if (domain != NULL) {
+ entry->domain = kstrdup(domain, GFP_ATOMIC);
+ if (entry->domain == NULL)
+ goto cfg_unlbl_add_map_failure;
+ }
+ entry->type = NETLBL_NLTYPE_UNLABELED;
+
+ ret_val = netlbl_domhsh_add(entry, audit_info);
+ if (ret_val != 0)
+ goto cfg_unlbl_add_map_failure;
+
+ return 0;
+
+cfg_unlbl_add_map_failure:
+ if (entry != NULL)
+ kfree(entry->domain);
+ kfree(entry);
+ return ret_val;
+}
+
+/**
+ * netlbl_cfg_cipsov4_add_map - Add a new CIPSOv4 DOI definition and mapping
+ * @doi_def: the DOI definition
+ * @domain: the domain mapping to add
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Add a new CIPSOv4 DOI definition and NetLabel/LSM domain mapping for this
+ * new DOI definition to the NetLabel subsystem. A @domain value of NULL adds
+ * a new default domain mapping. Returns zero on success, negative values on
+ * failure.
+ *
+ */
+int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def,
+ const char *domain,
+ struct netlbl_audit *audit_info)
+{
+ int ret_val = -ENOMEM;
+ u32 doi;
+ u32 doi_type;
+ struct netlbl_dom_map *entry;
+ const char *type_str;
+ struct audit_buffer *audit_buf;
+
+ doi = doi_def->doi;
+ doi_type = doi_def->type;
+
+ entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+ if (entry == NULL)
+ return -ENOMEM;
+ if (domain != NULL) {
+ entry->domain = kstrdup(domain, GFP_ATOMIC);
+ if (entry->domain == NULL)
+ goto cfg_cipsov4_add_map_failure;
+ }
+
+ ret_val = cipso_v4_doi_add(doi_def);
+ if (ret_val != 0)
+ goto cfg_cipsov4_add_map_failure_remove_doi;
+ entry->type = NETLBL_NLTYPE_CIPSOV4;
+ entry->type_def.cipsov4 = cipso_v4_doi_getdef(doi);
+ if (entry->type_def.cipsov4 == NULL) {
+ ret_val = -ENOENT;
+ goto cfg_cipsov4_add_map_failure_remove_doi;
+ }
+ ret_val = netlbl_domhsh_add(entry, audit_info);
+ if (ret_val != 0)
+ goto cfg_cipsov4_add_map_failure_release_doi;
+
+cfg_cipsov4_add_map_return:
+ audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
+ audit_info);
+ if (audit_buf != NULL) {
+ switch (doi_type) {
+ case CIPSO_V4_MAP_TRANS:
+ type_str = "trans";
+ break;
+ case CIPSO_V4_MAP_PASS:
+ type_str = "pass";
+ break;
+ case CIPSO_V4_MAP_LOCAL:
+ type_str = "local";
+ break;
+ default:
+ type_str = "(unknown)";
+ }
+ audit_log_format(audit_buf,
+ " cipso_doi=%u cipso_type=%s res=%u",
+ doi, type_str, ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
+
+ return ret_val;
+
+cfg_cipsov4_add_map_failure_release_doi:
+ cipso_v4_doi_putdef(doi_def);
+cfg_cipsov4_add_map_failure_remove_doi:
+ cipso_v4_doi_remove(doi, audit_info);
+cfg_cipsov4_add_map_failure:
+ if (entry != NULL)
+ kfree(entry->domain);
+ kfree(entry);
+ goto cfg_cipsov4_add_map_return;
+}
+
+/*
+ * Security Attribute Functions
+ */
+
+/**
+ * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
+ * @catmap: the category bitmap
+ * @offset: the offset to start searching at, in bits
+ *
+ * Description:
+ * This function walks a LSM secattr category bitmap starting at @offset and
+ * returns the spot of the first set bit or -ENOENT if no bits are set.
+ *
+ */
+int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
+ u32 offset)
+{
+ struct netlbl_lsm_secattr_catmap *iter = catmap;
+ u32 node_idx;
+ u32 node_bit;
+ NETLBL_CATMAP_MAPTYPE bitmap;
+
+ if (offset > iter->startbit) {
+ while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+ iter = iter->next;
+ if (iter == NULL)
+ return -ENOENT;
+ }
+ node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
+ node_bit = offset - iter->startbit -
+ (NETLBL_CATMAP_MAPSIZE * node_idx);
+ } else {
+ node_idx = 0;
+ node_bit = 0;
+ }
+ bitmap = iter->bitmap[node_idx] >> node_bit;
+
+ for (;;) {
+ if (bitmap != 0) {
+ while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
+ bitmap >>= 1;
+ node_bit++;
+ }
+ return iter->startbit +
+ (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
+ }
+ if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
+ if (iter->next != NULL) {
+ iter = iter->next;
+ node_idx = 0;
+ } else
+ return -ENOENT;
+ }
+ bitmap = iter->bitmap[node_idx];
+ node_bit = 0;
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
+ * @catmap: the category bitmap
+ * @offset: the offset to start searching at, in bits
+ *
+ * Description:
+ * This function walks a LSM secattr category bitmap starting at @offset and
+ * returns the spot of the first cleared bit or -ENOENT if the offset is past
+ * the end of the bitmap.
+ *
+ */
+int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
+ u32 offset)
+{
+ struct netlbl_lsm_secattr_catmap *iter = catmap;
+ u32 node_idx;
+ u32 node_bit;
+ NETLBL_CATMAP_MAPTYPE bitmask;
+ NETLBL_CATMAP_MAPTYPE bitmap;
+
+ if (offset > iter->startbit) {
+ while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+ iter = iter->next;
+ if (iter == NULL)
+ return -ENOENT;
+ }
+ node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
+ node_bit = offset - iter->startbit -
+ (NETLBL_CATMAP_MAPSIZE * node_idx);
+ } else {
+ node_idx = 0;
+ node_bit = 0;
+ }
+ bitmask = NETLBL_CATMAP_BIT << node_bit;
+
+ for (;;) {
+ bitmap = iter->bitmap[node_idx];
+ while (bitmask != 0 && (bitmap & bitmask) != 0) {
+ bitmask <<= 1;
+ node_bit++;
+ }
+
+ if (bitmask != 0)
+ return iter->startbit +
+ (NETLBL_CATMAP_MAPSIZE * node_idx) +
+ node_bit - 1;
+ else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
+ if (iter->next == NULL)
+ return iter->startbit + NETLBL_CATMAP_SIZE - 1;
+ iter = iter->next;
+ node_idx = 0;
+ }
+ bitmask = NETLBL_CATMAP_BIT;
+ node_bit = 0;
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
+ * @catmap: the category bitmap
+ * @bit: the bit to set
+ * @flags: memory allocation flags
+ *
+ * Description:
+ * Set the bit specified by @bit in @catmap. Returns zero on success,
+ * negative values on failure.
+ *
+ */
+int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
+ u32 bit,
+ gfp_t flags)
+{
+ struct netlbl_lsm_secattr_catmap *iter = catmap;
+ u32 node_bit;
+ u32 node_idx;
+
+ while (iter->next != NULL &&
+ bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
+ iter = iter->next;
+ if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+ iter->next = netlbl_secattr_catmap_alloc(flags);
+ if (iter->next == NULL)
+ return -ENOMEM;
+ iter = iter->next;
+ iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
+ }
+
+ /* gcc always rounds to zero when doing integer division */
+ node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
+ node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
+ iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
+
+ return 0;
+}
+
+/**
+ * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
+ * @catmap: the category bitmap
+ * @start: the starting bit
+ * @end: the last bit in the string
+ * @flags: memory allocation flags
+ *
+ * Description:
+ * Set a range of bits, starting at @start and ending with @end. Returns zero
+ * on success, negative values on failure.
+ *
+ */
+int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
+ u32 start,
+ u32 end,
+ gfp_t flags)
+{
+ int ret_val = 0;
+ struct netlbl_lsm_secattr_catmap *iter = catmap;
+ u32 iter_max_spot;
+ u32 spot;
+
+ /* XXX - This could probably be made a bit faster by combining writes
+ * to the catmap instead of setting a single bit each time, but for
+ * right now skipping to the start of the range in the catmap should
+ * be a nice improvement over calling the individual setbit function
+ * repeatedly from a loop. */
+
+ while (iter->next != NULL &&
+ start >= (iter->startbit + NETLBL_CATMAP_SIZE))
+ iter = iter->next;
+ iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
+
+ for (spot = start; spot <= end && ret_val == 0; spot++) {
+ if (spot >= iter_max_spot && iter->next != NULL) {
+ iter = iter->next;
+ iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
+ }
+ ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
+ }
+
+ return ret_val;
+}
/*
* LSM Functions
*/
/**
+ * netlbl_enabled - Determine if the NetLabel subsystem is enabled
+ *
+ * Description:
+ * The LSM can use this function to determine if it should use NetLabel
+ * security attributes in it's enforcement mechanism. Currently, NetLabel is
+ * considered to be enabled when it's configuration contains a valid setup for
+ * at least one labeled protocol (i.e. NetLabel can understand incoming
+ * labeled packets of at least one type); otherwise NetLabel is considered to
+ * be disabled.
+ *
+ */
+int netlbl_enabled(void)
+{
+ /* At some point we probably want to expose this mechanism to the user
+ * as well so that admins can toggle NetLabel regardless of the
+ * configuration */
+ return (atomic_read(&netlabel_mgmt_protocount) > 0);
+}
+
+/**
* netlbl_socket_setattr - Label a socket using the correct protocol
- * @sock: the socket to label
+ * @sk: the socket to label
* @secattr: the security attributes
*
* Description:
* Attach the correct label to the given socket using the security attributes
- * specified in @secattr. This function requires exclusive access to
- * @sock->sk, which means it either needs to be in the process of being
- * created or locked via lock_sock(sock->sk). Returns zero on success,
- * negative values on failure.
+ * specified in @secattr. This function requires exclusive access to @sk,
+ * which means it either needs to be in the process of being created or locked.
+ * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
+ * network address selectors (can't blindly label the socket), and negative
+ * values on all other failures.
*
*/
-int netlbl_socket_setattr(const struct socket *sock,
- const struct netlbl_lsm_secattr *secattr)
+int netlbl_sock_setattr(struct sock *sk,
+ const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOENT;
struct netlbl_dom_map *dom_entry;
if (dom_entry == NULL)
goto socket_setattr_return;
switch (dom_entry->type) {
+ case NETLBL_NLTYPE_ADDRSELECT:
+ ret_val = -EDESTADDRREQ;
+ break;
case NETLBL_NLTYPE_CIPSOV4:
- ret_val = cipso_v4_socket_setattr(sock,
- dom_entry->type_def.cipsov4,
- secattr);
+ ret_val = cipso_v4_sock_setattr(sk,
+ dom_entry->type_def.cipsov4,
+ secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
ret_val = 0;
}
/**
+ * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
+ * @sk: the socket
+ *
+ * Description:
+ * Remove all the NetLabel labeling from @sk. The caller is responsible for
+ * ensuring that @sk is locked.
+ *
+ */
+void netlbl_sock_delattr(struct sock *sk)
+{
+ cipso_v4_sock_delattr(sk);
+}
+
+/**
* netlbl_sock_getattr - Determine the security attributes of a sock
* @sk: the sock
* @secattr: the security attributes
*
* Description:
- * Examines the given sock to see any NetLabel style labeling has been
+ * Examines the given sock to see if any NetLabel style labeling has been
* applied to the sock, if so it parses the socket label and returns the
* security attributes in @secattr. Returns zero on success, negative values
* on failure.
*/
int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
{
+ return cipso_v4_sock_getattr(sk, secattr);
+}
+
+/**
+ * netlbl_conn_setattr - Label a connected socket using the correct protocol
+ * @sk: the socket to label
+ * @addr: the destination address
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Attach the correct label to the given connected socket using the security
+ * attributes specified in @secattr. The caller is responsible for ensuring
+ * that @sk is locked. Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_conn_setattr(struct sock *sk,
+ struct sockaddr *addr,
+ const struct netlbl_lsm_secattr *secattr)
+{
int ret_val;
+ struct sockaddr_in *addr4;
+ struct netlbl_domaddr4_map *af4_entry;
- ret_val = cipso_v4_sock_getattr(sk, secattr);
- if (ret_val == 0)
- return 0;
+ rcu_read_lock();
+ switch (addr->sa_family) {
+ case AF_INET:
+ addr4 = (struct sockaddr_in *)addr;
+ af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
+ addr4->sin_addr.s_addr);
+ if (af4_entry == NULL) {
+ ret_val = -ENOENT;
+ goto conn_setattr_return;
+ }
+ switch (af4_entry->type) {
+ case NETLBL_NLTYPE_CIPSOV4:
+ ret_val = cipso_v4_sock_setattr(sk,
+ af4_entry->type_def.cipsov4,
+ secattr);
+ break;
+ case NETLBL_NLTYPE_UNLABELED:
+ /* just delete the protocols we support for right now
+ * but we could remove other protocols if needed */
+ cipso_v4_sock_delattr(sk);
+ ret_val = 0;
+ break;
+ default:
+ ret_val = -ENOENT;
+ }
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ /* since we don't support any IPv6 labeling protocols right
+ * now we can optimize everything away until we do */
+ ret_val = 0;
+ break;
+#endif /* IPv6 */
+ default:
+ ret_val = 0;
+ }
- return netlbl_unlabel_getattr(secattr);
+conn_setattr_return:
+ rcu_read_unlock();
+ return ret_val;
}
/**
- * netlbl_socket_getattr - Determine the security attributes of a socket
- * @sock: the socket
+ * netlbl_skbuff_setattr - Label a packet using the correct protocol
+ * @skb: the packet
+ * @family: protocol family
* @secattr: the security attributes
*
* Description:
- * Examines the given socket to see any NetLabel style labeling has been
- * applied to the socket, if so it parses the socket label and returns the
- * security attributes in @secattr. Returns zero on success, negative values
- * on failure.
+ * Attach the correct label to the given packet using the security attributes
+ * specified in @secattr. Returns zero on success, negative values on failure.
*
*/
-int netlbl_socket_getattr(const struct socket *sock,
- struct netlbl_lsm_secattr *secattr)
+int netlbl_skbuff_setattr(struct sk_buff *skb,
+ u16 family,
+ const struct netlbl_lsm_secattr *secattr)
{
int ret_val;
+ struct iphdr *hdr4;
+ struct netlbl_domaddr4_map *af4_entry;
- ret_val = cipso_v4_socket_getattr(sock, secattr);
- if (ret_val == 0)
- return 0;
+ rcu_read_lock();
+ switch (family) {
+ case AF_INET:
+ hdr4 = ip_hdr(skb);
+ af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
+ hdr4->daddr);
+ if (af4_entry == NULL) {
+ ret_val = -ENOENT;
+ goto skbuff_setattr_return;
+ }
+ switch (af4_entry->type) {
+ case NETLBL_NLTYPE_CIPSOV4:
+ ret_val = cipso_v4_skbuff_setattr(skb,
+ af4_entry->type_def.cipsov4,
+ secattr);
+ break;
+ case NETLBL_NLTYPE_UNLABELED:
+ /* just delete the protocols we support for right now
+ * but we could remove other protocols if needed */
+ ret_val = cipso_v4_skbuff_delattr(skb);
+ break;
+ default:
+ ret_val = -ENOENT;
+ }
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ /* since we don't support any IPv6 labeling protocols right
+ * now we can optimize everything away until we do */
+ ret_val = 0;
+ break;
+#endif /* IPv6 */
+ default:
+ ret_val = 0;
+ }
- return netlbl_unlabel_getattr(secattr);
+skbuff_setattr_return:
+ rcu_read_unlock();
+ return ret_val;
}
/**
* netlbl_skbuff_getattr - Determine the security attributes of a packet
* @skb: the packet
+ * @family: protocol family
* @secattr: the security attributes
*
* Description:
*
*/
int netlbl_skbuff_getattr(const struct sk_buff *skb,
+ u16 family,
struct netlbl_lsm_secattr *secattr)
{
- int ret_val;
-
- ret_val = cipso_v4_skbuff_getattr(skb, secattr);
- if (ret_val == 0)
+ if (CIPSO_V4_OPTEXIST(skb) &&
+ cipso_v4_skbuff_getattr(skb, secattr) == 0)
return 0;
- return netlbl_unlabel_getattr(secattr);
+ return netlbl_unlabel_getattr(skb, family, secattr);
}
/**
* netlbl_skbuff_err - Handle a LSM error on a sk_buff
* @skb: the packet
* @error: the error code
+ * @gateway: true if host is acting as a gateway, false otherwise
*
* Description:
* Deal with a LSM problem when handling the packet in @skb, typically this is
* according to the packet's labeling protocol.
*
*/
-void netlbl_skbuff_err(struct sk_buff *skb, int error)
+void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
{
if (CIPSO_V4_OPTEXIST(skb))
- cipso_v4_error(skb, error, 0);
+ cipso_v4_error(skb, error, gateway);
}
/**
int netlbl_cache_add(const struct sk_buff *skb,
const struct netlbl_lsm_secattr *secattr)
{
- if (secattr->cache == NULL)
+ if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
return -ENOMSG;
if (CIPSO_V4_OPTEXIST(skb))
if (ret_val != 0)
goto init_failure;
+ ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
+ if (ret_val != 0)
+ goto init_failure;
+
ret_val = netlbl_netlink_init();
if (ret_val != 0)
goto init_failure;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff