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1523 lines
37 KiB
1523 lines
37 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* NetLabel Kernel API |
|
* |
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* This file defines the kernel API for the NetLabel system. The NetLabel |
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* system manages static and dynamic label mappings for network protocols such |
|
* as CIPSO and RIPSO. |
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* |
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* Author: Paul Moore <[email protected]> |
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*/ |
|
|
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/* |
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
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*/ |
|
|
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/audit.h> |
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#include <linux/in.h> |
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#include <linux/in6.h> |
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#include <net/ip.h> |
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#include <net/ipv6.h> |
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#include <net/netlabel.h> |
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#include <net/cipso_ipv4.h> |
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#include <net/calipso.h> |
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#include <asm/bug.h> |
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#include <linux/atomic.h> |
|
|
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#include "netlabel_domainhash.h" |
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#include "netlabel_unlabeled.h" |
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#include "netlabel_cipso_v4.h" |
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#include "netlabel_calipso.h" |
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#include "netlabel_user.h" |
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#include "netlabel_mgmt.h" |
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#include "netlabel_addrlist.h" |
|
|
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/* |
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* Configuration Functions |
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*/ |
|
|
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/** |
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* netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping |
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* @domain: the domain mapping to remove |
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* @family: address family |
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* @addr: IP address |
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* @mask: IP address mask |
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* @audit_info: NetLabel audit information |
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* |
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* Description: |
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* Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the |
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* default domain mapping to be removed. Returns zero on success, negative |
|
* values on failure. |
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* |
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*/ |
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int netlbl_cfg_map_del(const char *domain, |
|
u16 family, |
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const void *addr, |
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const void *mask, |
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struct netlbl_audit *audit_info) |
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{ |
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if (addr == NULL && mask == NULL) { |
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return netlbl_domhsh_remove(domain, family, audit_info); |
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} else if (addr != NULL && mask != NULL) { |
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switch (family) { |
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case AF_INET: |
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return netlbl_domhsh_remove_af4(domain, addr, mask, |
|
audit_info); |
|
#if IS_ENABLED(CONFIG_IPV6) |
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case AF_INET6: |
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return netlbl_domhsh_remove_af6(domain, addr, mask, |
|
audit_info); |
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#endif /* IPv6 */ |
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default: |
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return -EPFNOSUPPORT; |
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} |
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} else |
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return -EINVAL; |
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} |
|
|
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/** |
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* netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping |
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* @domain: the domain mapping to add |
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* @family: address family |
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* @addr: IP address |
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* @mask: IP address mask |
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* @audit_info: NetLabel audit information |
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* |
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* Description: |
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* Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL |
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* causes a new default domain mapping to be added. Returns zero on success, |
|
* negative values on failure. |
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* |
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*/ |
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int netlbl_cfg_unlbl_map_add(const char *domain, |
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u16 family, |
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const void *addr, |
|
const void *mask, |
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struct netlbl_audit *audit_info) |
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{ |
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int ret_val = -ENOMEM; |
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struct netlbl_dom_map *entry; |
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struct netlbl_domaddr_map *addrmap = NULL; |
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struct netlbl_domaddr4_map *map4 = NULL; |
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struct netlbl_domaddr6_map *map6 = NULL; |
|
|
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entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
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if (entry == NULL) |
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return -ENOMEM; |
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if (domain != NULL) { |
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entry->domain = kstrdup(domain, GFP_ATOMIC); |
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if (entry->domain == NULL) |
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goto cfg_unlbl_map_add_failure; |
|
} |
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entry->family = family; |
|
|
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if (addr == NULL && mask == NULL) |
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entry->def.type = NETLBL_NLTYPE_UNLABELED; |
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else if (addr != NULL && mask != NULL) { |
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addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); |
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if (addrmap == NULL) |
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goto cfg_unlbl_map_add_failure; |
|
INIT_LIST_HEAD(&addrmap->list4); |
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INIT_LIST_HEAD(&addrmap->list6); |
|
|
|
switch (family) { |
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case AF_INET: { |
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const struct in_addr *addr4 = addr; |
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const struct in_addr *mask4 = mask; |
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map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); |
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if (map4 == NULL) |
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goto cfg_unlbl_map_add_failure; |
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map4->def.type = NETLBL_NLTYPE_UNLABELED; |
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map4->list.addr = addr4->s_addr & mask4->s_addr; |
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map4->list.mask = mask4->s_addr; |
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map4->list.valid = 1; |
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ret_val = netlbl_af4list_add(&map4->list, |
|
&addrmap->list4); |
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if (ret_val != 0) |
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goto cfg_unlbl_map_add_failure; |
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break; |
|
} |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: { |
|
const struct in6_addr *addr6 = addr; |
|
const struct in6_addr *mask6 = mask; |
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map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); |
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if (map6 == NULL) |
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goto cfg_unlbl_map_add_failure; |
|
map6->def.type = NETLBL_NLTYPE_UNLABELED; |
|
map6->list.addr = *addr6; |
|
map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; |
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map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; |
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map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; |
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map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; |
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map6->list.mask = *mask6; |
|
map6->list.valid = 1; |
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ret_val = netlbl_af6list_add(&map6->list, |
|
&addrmap->list6); |
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if (ret_val != 0) |
|
goto cfg_unlbl_map_add_failure; |
|
break; |
|
} |
|
#endif /* IPv6 */ |
|
default: |
|
goto cfg_unlbl_map_add_failure; |
|
} |
|
|
|
entry->def.addrsel = addrmap; |
|
entry->def.type = NETLBL_NLTYPE_ADDRSELECT; |
|
} else { |
|
ret_val = -EINVAL; |
|
goto cfg_unlbl_map_add_failure; |
|
} |
|
|
|
ret_val = netlbl_domhsh_add(entry, audit_info); |
|
if (ret_val != 0) |
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goto cfg_unlbl_map_add_failure; |
|
|
|
return 0; |
|
|
|
cfg_unlbl_map_add_failure: |
|
kfree(entry->domain); |
|
kfree(entry); |
|
kfree(addrmap); |
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kfree(map4); |
|
kfree(map6); |
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return ret_val; |
|
} |
|
|
|
|
|
/** |
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* netlbl_cfg_unlbl_static_add - Adds a new static label |
|
* @net: network namespace |
|
* @dev_name: interface name |
|
* @addr: IP address in network byte order (struct in[6]_addr) |
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* @mask: address mask in network byte order (struct in[6]_addr) |
|
* @family: address family |
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* @secid: LSM secid value for the entry |
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* @audit_info: NetLabel audit information |
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* |
|
* Description: |
|
* Adds a new NetLabel static label to be used when protocol provided labels |
|
* are not present on incoming traffic. If @dev_name is NULL then the default |
|
* interface will be used. Returns zero on success, negative values on failure. |
|
* |
|
*/ |
|
int netlbl_cfg_unlbl_static_add(struct net *net, |
|
const char *dev_name, |
|
const void *addr, |
|
const void *mask, |
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u16 family, |
|
u32 secid, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
u32 addr_len; |
|
|
|
switch (family) { |
|
case AF_INET: |
|
addr_len = sizeof(struct in_addr); |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
addr_len = sizeof(struct in6_addr); |
|
break; |
|
#endif /* IPv6 */ |
|
default: |
|
return -EPFNOSUPPORT; |
|
} |
|
|
|
return netlbl_unlhsh_add(net, |
|
dev_name, addr, mask, addr_len, |
|
secid, audit_info); |
|
} |
|
|
|
/** |
|
* netlbl_cfg_unlbl_static_del - Removes an existing static label |
|
* @net: network namespace |
|
* @dev_name: interface name |
|
* @addr: IP address in network byte order (struct in[6]_addr) |
|
* @mask: address mask in network byte order (struct in[6]_addr) |
|
* @family: address family |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Removes an existing NetLabel static label used when protocol provided labels |
|
* are not present on incoming traffic. If @dev_name is NULL then the default |
|
* interface will be used. Returns zero on success, negative values on failure. |
|
* |
|
*/ |
|
int netlbl_cfg_unlbl_static_del(struct net *net, |
|
const char *dev_name, |
|
const void *addr, |
|
const void *mask, |
|
u16 family, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
u32 addr_len; |
|
|
|
switch (family) { |
|
case AF_INET: |
|
addr_len = sizeof(struct in_addr); |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
addr_len = sizeof(struct in6_addr); |
|
break; |
|
#endif /* IPv6 */ |
|
default: |
|
return -EPFNOSUPPORT; |
|
} |
|
|
|
return netlbl_unlhsh_remove(net, |
|
dev_name, addr, mask, addr_len, |
|
audit_info); |
|
} |
|
|
|
/** |
|
* netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition |
|
* @doi_def: CIPSO DOI definition |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on |
|
* success and negative values on failure. |
|
* |
|
*/ |
|
int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, |
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struct netlbl_audit *audit_info) |
|
{ |
|
return cipso_v4_doi_add(doi_def, audit_info); |
|
} |
|
|
|
/** |
|
* netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition |
|
* @doi: CIPSO DOI |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Remove an existing CIPSO DOI definition matching @doi. Returns zero on |
|
* success and negative values on failure. |
|
* |
|
*/ |
|
void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) |
|
{ |
|
cipso_v4_doi_remove(doi, audit_info); |
|
} |
|
|
|
/** |
|
* netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping |
|
* @doi: the CIPSO DOI |
|
* @domain: the domain mapping to add |
|
* @addr: IP address |
|
* @mask: IP address mask |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Add a new NetLabel/LSM domain mapping for the given CIPSO DOI 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_map_add(u32 doi, |
|
const char *domain, |
|
const struct in_addr *addr, |
|
const struct in_addr *mask, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
int ret_val = -ENOMEM; |
|
struct cipso_v4_doi *doi_def; |
|
struct netlbl_dom_map *entry; |
|
struct netlbl_domaddr_map *addrmap = NULL; |
|
struct netlbl_domaddr4_map *addrinfo = NULL; |
|
|
|
doi_def = cipso_v4_doi_getdef(doi); |
|
if (doi_def == NULL) |
|
return -ENOENT; |
|
|
|
entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
|
if (entry == NULL) |
|
goto out_entry; |
|
entry->family = AF_INET; |
|
if (domain != NULL) { |
|
entry->domain = kstrdup(domain, GFP_ATOMIC); |
|
if (entry->domain == NULL) |
|
goto out_domain; |
|
} |
|
|
|
if (addr == NULL && mask == NULL) { |
|
entry->def.cipso = doi_def; |
|
entry->def.type = NETLBL_NLTYPE_CIPSOV4; |
|
} else if (addr != NULL && mask != NULL) { |
|
addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); |
|
if (addrmap == NULL) |
|
goto out_addrmap; |
|
INIT_LIST_HEAD(&addrmap->list4); |
|
INIT_LIST_HEAD(&addrmap->list6); |
|
|
|
addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); |
|
if (addrinfo == NULL) |
|
goto out_addrinfo; |
|
addrinfo->def.cipso = doi_def; |
|
addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4; |
|
addrinfo->list.addr = addr->s_addr & mask->s_addr; |
|
addrinfo->list.mask = mask->s_addr; |
|
addrinfo->list.valid = 1; |
|
ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); |
|
if (ret_val != 0) |
|
goto cfg_cipsov4_map_add_failure; |
|
|
|
entry->def.addrsel = addrmap; |
|
entry->def.type = NETLBL_NLTYPE_ADDRSELECT; |
|
} else { |
|
ret_val = -EINVAL; |
|
goto out_addrmap; |
|
} |
|
|
|
ret_val = netlbl_domhsh_add(entry, audit_info); |
|
if (ret_val != 0) |
|
goto cfg_cipsov4_map_add_failure; |
|
|
|
return 0; |
|
|
|
cfg_cipsov4_map_add_failure: |
|
kfree(addrinfo); |
|
out_addrinfo: |
|
kfree(addrmap); |
|
out_addrmap: |
|
kfree(entry->domain); |
|
out_domain: |
|
kfree(entry); |
|
out_entry: |
|
cipso_v4_doi_putdef(doi_def); |
|
return ret_val; |
|
} |
|
|
|
/** |
|
* netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition |
|
* @doi_def: CALIPSO DOI definition |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on |
|
* success and negative values on failure. |
|
* |
|
*/ |
|
int netlbl_cfg_calipso_add(struct calipso_doi *doi_def, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
return calipso_doi_add(doi_def, audit_info); |
|
#else /* IPv6 */ |
|
return -ENOSYS; |
|
#endif /* IPv6 */ |
|
} |
|
|
|
/** |
|
* netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition |
|
* @doi: CALIPSO DOI |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Remove an existing CALIPSO DOI definition matching @doi. Returns zero on |
|
* success and negative values on failure. |
|
* |
|
*/ |
|
void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info) |
|
{ |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
calipso_doi_remove(doi, audit_info); |
|
#endif /* IPv6 */ |
|
} |
|
|
|
/** |
|
* netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping |
|
* @doi: the CALIPSO DOI |
|
* @domain: the domain mapping to add |
|
* @addr: IP address |
|
* @mask: IP address mask |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI 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_calipso_map_add(u32 doi, |
|
const char *domain, |
|
const struct in6_addr *addr, |
|
const struct in6_addr *mask, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
int ret_val = -ENOMEM; |
|
struct calipso_doi *doi_def; |
|
struct netlbl_dom_map *entry; |
|
struct netlbl_domaddr_map *addrmap = NULL; |
|
struct netlbl_domaddr6_map *addrinfo = NULL; |
|
|
|
doi_def = calipso_doi_getdef(doi); |
|
if (doi_def == NULL) |
|
return -ENOENT; |
|
|
|
entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
|
if (entry == NULL) |
|
goto out_entry; |
|
entry->family = AF_INET6; |
|
if (domain != NULL) { |
|
entry->domain = kstrdup(domain, GFP_ATOMIC); |
|
if (entry->domain == NULL) |
|
goto out_domain; |
|
} |
|
|
|
if (addr == NULL && mask == NULL) { |
|
entry->def.calipso = doi_def; |
|
entry->def.type = NETLBL_NLTYPE_CALIPSO; |
|
} else if (addr != NULL && mask != NULL) { |
|
addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); |
|
if (addrmap == NULL) |
|
goto out_addrmap; |
|
INIT_LIST_HEAD(&addrmap->list4); |
|
INIT_LIST_HEAD(&addrmap->list6); |
|
|
|
addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); |
|
if (addrinfo == NULL) |
|
goto out_addrinfo; |
|
addrinfo->def.calipso = doi_def; |
|
addrinfo->def.type = NETLBL_NLTYPE_CALIPSO; |
|
addrinfo->list.addr = *addr; |
|
addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; |
|
addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; |
|
addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; |
|
addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; |
|
addrinfo->list.mask = *mask; |
|
addrinfo->list.valid = 1; |
|
ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6); |
|
if (ret_val != 0) |
|
goto cfg_calipso_map_add_failure; |
|
|
|
entry->def.addrsel = addrmap; |
|
entry->def.type = NETLBL_NLTYPE_ADDRSELECT; |
|
} else { |
|
ret_val = -EINVAL; |
|
goto out_addrmap; |
|
} |
|
|
|
ret_val = netlbl_domhsh_add(entry, audit_info); |
|
if (ret_val != 0) |
|
goto cfg_calipso_map_add_failure; |
|
|
|
return 0; |
|
|
|
cfg_calipso_map_add_failure: |
|
kfree(addrinfo); |
|
out_addrinfo: |
|
kfree(addrmap); |
|
out_addrmap: |
|
kfree(entry->domain); |
|
out_domain: |
|
kfree(entry); |
|
out_entry: |
|
calipso_doi_putdef(doi_def); |
|
return ret_val; |
|
#else /* IPv6 */ |
|
return -ENOSYS; |
|
#endif /* IPv6 */ |
|
} |
|
|
|
/* |
|
* Security Attribute Functions |
|
*/ |
|
|
|
#define _CM_F_NONE 0x00000000 |
|
#define _CM_F_ALLOC 0x00000001 |
|
#define _CM_F_WALK 0x00000002 |
|
|
|
/** |
|
* _netlbl_catmap_getnode - Get a individual node from a catmap |
|
* @catmap: pointer to the category bitmap |
|
* @offset: the requested offset |
|
* @cm_flags: catmap flags, see _CM_F_* |
|
* @gfp_flags: memory allocation flags |
|
* |
|
* Description: |
|
* Iterate through the catmap looking for the node associated with @offset. |
|
* If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node, |
|
* one will be created and inserted into the catmap. If the _CM_F_WALK flag is |
|
* set in @cm_flags and there is no associated node, the next highest node will |
|
* be returned. Returns a pointer to the node on success, NULL on failure. |
|
* |
|
*/ |
|
static struct netlbl_lsm_catmap *_netlbl_catmap_getnode( |
|
struct netlbl_lsm_catmap **catmap, |
|
u32 offset, |
|
unsigned int cm_flags, |
|
gfp_t gfp_flags) |
|
{ |
|
struct netlbl_lsm_catmap *iter = *catmap; |
|
struct netlbl_lsm_catmap *prev = NULL; |
|
|
|
if (iter == NULL) |
|
goto catmap_getnode_alloc; |
|
if (offset < iter->startbit) |
|
goto catmap_getnode_walk; |
|
while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
|
prev = iter; |
|
iter = iter->next; |
|
} |
|
if (iter == NULL || offset < iter->startbit) |
|
goto catmap_getnode_walk; |
|
|
|
return iter; |
|
|
|
catmap_getnode_walk: |
|
if (cm_flags & _CM_F_WALK) |
|
return iter; |
|
catmap_getnode_alloc: |
|
if (!(cm_flags & _CM_F_ALLOC)) |
|
return NULL; |
|
|
|
iter = netlbl_catmap_alloc(gfp_flags); |
|
if (iter == NULL) |
|
return NULL; |
|
iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1); |
|
|
|
if (prev == NULL) { |
|
iter->next = *catmap; |
|
*catmap = iter; |
|
} else { |
|
iter->next = prev->next; |
|
prev->next = iter; |
|
} |
|
|
|
return iter; |
|
} |
|
|
|
/** |
|
* netlbl_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_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset) |
|
{ |
|
struct netlbl_lsm_catmap *iter; |
|
u32 idx; |
|
u32 bit; |
|
NETLBL_CATMAP_MAPTYPE bitmap; |
|
|
|
iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); |
|
if (iter == NULL) |
|
return -ENOENT; |
|
if (offset > iter->startbit) { |
|
offset -= iter->startbit; |
|
idx = offset / NETLBL_CATMAP_MAPSIZE; |
|
bit = offset % NETLBL_CATMAP_MAPSIZE; |
|
} else { |
|
idx = 0; |
|
bit = 0; |
|
} |
|
bitmap = iter->bitmap[idx] >> bit; |
|
|
|
for (;;) { |
|
if (bitmap != 0) { |
|
while ((bitmap & NETLBL_CATMAP_BIT) == 0) { |
|
bitmap >>= 1; |
|
bit++; |
|
} |
|
return iter->startbit + |
|
(NETLBL_CATMAP_MAPSIZE * idx) + bit; |
|
} |
|
if (++idx >= NETLBL_CATMAP_MAPCNT) { |
|
if (iter->next != NULL) { |
|
iter = iter->next; |
|
idx = 0; |
|
} else |
|
return -ENOENT; |
|
} |
|
bitmap = iter->bitmap[idx]; |
|
bit = 0; |
|
} |
|
|
|
return -ENOENT; |
|
} |
|
EXPORT_SYMBOL(netlbl_catmap_walk); |
|
|
|
/** |
|
* netlbl_catmap_walkrng - 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_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset) |
|
{ |
|
struct netlbl_lsm_catmap *iter; |
|
struct netlbl_lsm_catmap *prev = NULL; |
|
u32 idx; |
|
u32 bit; |
|
NETLBL_CATMAP_MAPTYPE bitmask; |
|
NETLBL_CATMAP_MAPTYPE bitmap; |
|
|
|
iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); |
|
if (iter == NULL) |
|
return -ENOENT; |
|
if (offset > iter->startbit) { |
|
offset -= iter->startbit; |
|
idx = offset / NETLBL_CATMAP_MAPSIZE; |
|
bit = offset % NETLBL_CATMAP_MAPSIZE; |
|
} else { |
|
idx = 0; |
|
bit = 0; |
|
} |
|
bitmask = NETLBL_CATMAP_BIT << bit; |
|
|
|
for (;;) { |
|
bitmap = iter->bitmap[idx]; |
|
while (bitmask != 0 && (bitmap & bitmask) != 0) { |
|
bitmask <<= 1; |
|
bit++; |
|
} |
|
|
|
if (prev && idx == 0 && bit == 0) |
|
return prev->startbit + NETLBL_CATMAP_SIZE - 1; |
|
else if (bitmask != 0) |
|
return iter->startbit + |
|
(NETLBL_CATMAP_MAPSIZE * idx) + bit - 1; |
|
else if (++idx >= NETLBL_CATMAP_MAPCNT) { |
|
if (iter->next == NULL) |
|
return iter->startbit + NETLBL_CATMAP_SIZE - 1; |
|
prev = iter; |
|
iter = iter->next; |
|
idx = 0; |
|
} |
|
bitmask = NETLBL_CATMAP_BIT; |
|
bit = 0; |
|
} |
|
|
|
return -ENOENT; |
|
} |
|
|
|
/** |
|
* netlbl_catmap_getlong - Export an unsigned long bitmap |
|
* @catmap: pointer to the category bitmap |
|
* @offset: pointer to the requested offset |
|
* @bitmap: the exported bitmap |
|
* |
|
* Description: |
|
* Export a bitmap with an offset greater than or equal to @offset and return |
|
* it in @bitmap. The @offset must be aligned to an unsigned long and will be |
|
* updated on return if different from what was requested; if the catmap is |
|
* empty at the requested offset and beyond, the @offset is set to (u32)-1. |
|
* Returns zero on sucess, negative values on failure. |
|
* |
|
*/ |
|
int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, |
|
u32 *offset, |
|
unsigned long *bitmap) |
|
{ |
|
struct netlbl_lsm_catmap *iter; |
|
u32 off = *offset; |
|
u32 idx; |
|
|
|
/* only allow aligned offsets */ |
|
if ((off & (BITS_PER_LONG - 1)) != 0) |
|
return -EINVAL; |
|
|
|
/* a null catmap is equivalent to an empty one */ |
|
if (!catmap) { |
|
*offset = (u32)-1; |
|
return 0; |
|
} |
|
|
|
if (off < catmap->startbit) { |
|
off = catmap->startbit; |
|
*offset = off; |
|
} |
|
iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0); |
|
if (iter == NULL) { |
|
*offset = (u32)-1; |
|
return 0; |
|
} |
|
|
|
if (off < iter->startbit) { |
|
*offset = iter->startbit; |
|
off = 0; |
|
} else |
|
off -= iter->startbit; |
|
idx = off / NETLBL_CATMAP_MAPSIZE; |
|
*bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* netlbl_catmap_setbit - Set a bit in a LSM secattr catmap |
|
* @catmap: pointer to 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_catmap_setbit(struct netlbl_lsm_catmap **catmap, |
|
u32 bit, |
|
gfp_t flags) |
|
{ |
|
struct netlbl_lsm_catmap *iter; |
|
u32 idx; |
|
|
|
iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags); |
|
if (iter == NULL) |
|
return -ENOMEM; |
|
|
|
bit -= iter->startbit; |
|
idx = bit / NETLBL_CATMAP_MAPSIZE; |
|
iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netlbl_catmap_setbit); |
|
|
|
/** |
|
* netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap |
|
* @catmap: pointer to 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_catmap_setrng(struct netlbl_lsm_catmap **catmap, |
|
u32 start, |
|
u32 end, |
|
gfp_t flags) |
|
{ |
|
int rc = 0; |
|
u32 spot = start; |
|
|
|
while (rc == 0 && spot <= end) { |
|
if (((spot & (BITS_PER_LONG - 1)) == 0) && |
|
((end - spot) > BITS_PER_LONG)) { |
|
rc = netlbl_catmap_setlong(catmap, |
|
spot, |
|
(unsigned long)-1, |
|
flags); |
|
spot += BITS_PER_LONG; |
|
} else |
|
rc = netlbl_catmap_setbit(catmap, spot++, flags); |
|
} |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* netlbl_catmap_setlong - Import an unsigned long bitmap |
|
* @catmap: pointer to the category bitmap |
|
* @offset: offset to the start of the imported bitmap |
|
* @bitmap: the bitmap to import |
|
* @flags: memory allocation flags |
|
* |
|
* Description: |
|
* Import the bitmap specified in @bitmap into @catmap, using the offset |
|
* in @offset. The offset must be aligned to an unsigned long. Returns zero |
|
* on success, negative values on failure. |
|
* |
|
*/ |
|
int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, |
|
u32 offset, |
|
unsigned long bitmap, |
|
gfp_t flags) |
|
{ |
|
struct netlbl_lsm_catmap *iter; |
|
u32 idx; |
|
|
|
/* only allow aligned offsets */ |
|
if ((offset & (BITS_PER_LONG - 1)) != 0) |
|
return -EINVAL; |
|
|
|
iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags); |
|
if (iter == NULL) |
|
return -ENOMEM; |
|
|
|
offset -= iter->startbit; |
|
idx = offset / NETLBL_CATMAP_MAPSIZE; |
|
iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE); |
|
|
|
return 0; |
|
} |
|
|
|
/* Bitmap functions |
|
*/ |
|
|
|
/** |
|
* netlbl_bitmap_walk - Walk a bitmap looking for a bit |
|
* @bitmap: the bitmap |
|
* @bitmap_len: length in bits |
|
* @offset: starting offset |
|
* @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit |
|
* |
|
* Description: |
|
* Starting at @offset, walk the bitmap from left to right until either the |
|
* desired bit is found or we reach the end. Return the bit offset, -1 if |
|
* not found, or -2 if error. |
|
*/ |
|
int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len, |
|
u32 offset, u8 state) |
|
{ |
|
u32 bit_spot; |
|
u32 byte_offset; |
|
unsigned char bitmask; |
|
unsigned char byte; |
|
|
|
byte_offset = offset / 8; |
|
byte = bitmap[byte_offset]; |
|
bit_spot = offset; |
|
bitmask = 0x80 >> (offset % 8); |
|
|
|
while (bit_spot < bitmap_len) { |
|
if ((state && (byte & bitmask) == bitmask) || |
|
(state == 0 && (byte & bitmask) == 0)) |
|
return bit_spot; |
|
|
|
if (++bit_spot >= bitmap_len) |
|
return -1; |
|
bitmask >>= 1; |
|
if (bitmask == 0) { |
|
byte = bitmap[++byte_offset]; |
|
bitmask = 0x80; |
|
} |
|
} |
|
|
|
return -1; |
|
} |
|
EXPORT_SYMBOL(netlbl_bitmap_walk); |
|
|
|
/** |
|
* netlbl_bitmap_setbit - Sets a single bit in a bitmap |
|
* @bitmap: the bitmap |
|
* @bit: the bit |
|
* @state: if non-zero, set the bit (1) else clear the bit (0) |
|
* |
|
* Description: |
|
* Set a single bit in the bitmask. Returns zero on success, negative values |
|
* on error. |
|
*/ |
|
void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state) |
|
{ |
|
u32 byte_spot; |
|
u8 bitmask; |
|
|
|
/* gcc always rounds to zero when doing integer division */ |
|
byte_spot = bit / 8; |
|
bitmask = 0x80 >> (bit % 8); |
|
if (state) |
|
bitmap[byte_spot] |= bitmask; |
|
else |
|
bitmap[byte_spot] &= ~bitmask; |
|
} |
|
EXPORT_SYMBOL(netlbl_bitmap_setbit); |
|
|
|
/* |
|
* 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_sock_setattr - Label a socket using the correct protocol |
|
* @sk: the socket to label |
|
* @family: protocol family |
|
* @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 @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_sock_setattr(struct sock *sk, |
|
u16 family, |
|
const struct netlbl_lsm_secattr *secattr) |
|
{ |
|
int ret_val; |
|
struct netlbl_dom_map *dom_entry; |
|
|
|
rcu_read_lock(); |
|
dom_entry = netlbl_domhsh_getentry(secattr->domain, family); |
|
if (dom_entry == NULL) { |
|
ret_val = -ENOENT; |
|
goto socket_setattr_return; |
|
} |
|
switch (family) { |
|
case AF_INET: |
|
switch (dom_entry->def.type) { |
|
case NETLBL_NLTYPE_ADDRSELECT: |
|
ret_val = -EDESTADDRREQ; |
|
break; |
|
case NETLBL_NLTYPE_CIPSOV4: |
|
ret_val = cipso_v4_sock_setattr(sk, |
|
dom_entry->def.cipso, |
|
secattr); |
|
break; |
|
case NETLBL_NLTYPE_UNLABELED: |
|
ret_val = 0; |
|
break; |
|
default: |
|
ret_val = -ENOENT; |
|
} |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
switch (dom_entry->def.type) { |
|
case NETLBL_NLTYPE_ADDRSELECT: |
|
ret_val = -EDESTADDRREQ; |
|
break; |
|
case NETLBL_NLTYPE_CALIPSO: |
|
ret_val = calipso_sock_setattr(sk, |
|
dom_entry->def.calipso, |
|
secattr); |
|
break; |
|
case NETLBL_NLTYPE_UNLABELED: |
|
ret_val = 0; |
|
break; |
|
default: |
|
ret_val = -ENOENT; |
|
} |
|
break; |
|
#endif /* IPv6 */ |
|
default: |
|
ret_val = -EPROTONOSUPPORT; |
|
} |
|
|
|
socket_setattr_return: |
|
rcu_read_unlock(); |
|
return ret_val; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
switch (sk->sk_family) { |
|
case AF_INET: |
|
cipso_v4_sock_delattr(sk); |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
calipso_sock_delattr(sk); |
|
break; |
|
#endif /* IPv6 */ |
|
} |
|
} |
|
|
|
/** |
|
* netlbl_sock_getattr - Determine the security attributes of a sock |
|
* @sk: the sock |
|
* @secattr: the security attributes |
|
* |
|
* Description: |
|
* 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) |
|
{ |
|
int ret_val; |
|
|
|
switch (sk->sk_family) { |
|
case AF_INET: |
|
ret_val = cipso_v4_sock_getattr(sk, secattr); |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
ret_val = calipso_sock_getattr(sk, secattr); |
|
break; |
|
#endif /* IPv6 */ |
|
default: |
|
ret_val = -EPROTONOSUPPORT; |
|
} |
|
|
|
return ret_val; |
|
} |
|
|
|
/** |
|
* 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; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct sockaddr_in6 *addr6; |
|
#endif |
|
struct netlbl_dommap_def *entry; |
|
|
|
rcu_read_lock(); |
|
switch (addr->sa_family) { |
|
case AF_INET: |
|
addr4 = (struct sockaddr_in *)addr; |
|
entry = netlbl_domhsh_getentry_af4(secattr->domain, |
|
addr4->sin_addr.s_addr); |
|
if (entry == NULL) { |
|
ret_val = -ENOENT; |
|
goto conn_setattr_return; |
|
} |
|
switch (entry->type) { |
|
case NETLBL_NLTYPE_CIPSOV4: |
|
ret_val = cipso_v4_sock_setattr(sk, |
|
entry->cipso, secattr); |
|
break; |
|
case NETLBL_NLTYPE_UNLABELED: |
|
/* just delete the protocols we support for right now |
|
* but we could remove other protocols if needed */ |
|
netlbl_sock_delattr(sk); |
|
ret_val = 0; |
|
break; |
|
default: |
|
ret_val = -ENOENT; |
|
} |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
addr6 = (struct sockaddr_in6 *)addr; |
|
entry = netlbl_domhsh_getentry_af6(secattr->domain, |
|
&addr6->sin6_addr); |
|
if (entry == NULL) { |
|
ret_val = -ENOENT; |
|
goto conn_setattr_return; |
|
} |
|
switch (entry->type) { |
|
case NETLBL_NLTYPE_CALIPSO: |
|
ret_val = calipso_sock_setattr(sk, |
|
entry->calipso, secattr); |
|
break; |
|
case NETLBL_NLTYPE_UNLABELED: |
|
/* just delete the protocols we support for right now |
|
* but we could remove other protocols if needed */ |
|
netlbl_sock_delattr(sk); |
|
ret_val = 0; |
|
break; |
|
default: |
|
ret_val = -ENOENT; |
|
} |
|
break; |
|
#endif /* IPv6 */ |
|
default: |
|
ret_val = -EPROTONOSUPPORT; |
|
} |
|
|
|
conn_setattr_return: |
|
rcu_read_unlock(); |
|
return ret_val; |
|
} |
|
|
|
/** |
|
* netlbl_req_setattr - Label a request socket using the correct protocol |
|
* @req: the request socket to label |
|
* @secattr: the security attributes |
|
* |
|
* Description: |
|
* Attach the correct label to the given socket using the security attributes |
|
* specified in @secattr. Returns zero on success, negative values on failure. |
|
* |
|
*/ |
|
int netlbl_req_setattr(struct request_sock *req, |
|
const struct netlbl_lsm_secattr *secattr) |
|
{ |
|
int ret_val; |
|
struct netlbl_dommap_def *entry; |
|
struct inet_request_sock *ireq = inet_rsk(req); |
|
|
|
rcu_read_lock(); |
|
switch (req->rsk_ops->family) { |
|
case AF_INET: |
|
entry = netlbl_domhsh_getentry_af4(secattr->domain, |
|
ireq->ir_rmt_addr); |
|
if (entry == NULL) { |
|
ret_val = -ENOENT; |
|
goto req_setattr_return; |
|
} |
|
switch (entry->type) { |
|
case NETLBL_NLTYPE_CIPSOV4: |
|
ret_val = cipso_v4_req_setattr(req, |
|
entry->cipso, secattr); |
|
break; |
|
case NETLBL_NLTYPE_UNLABELED: |
|
netlbl_req_delattr(req); |
|
ret_val = 0; |
|
break; |
|
default: |
|
ret_val = -ENOENT; |
|
} |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
entry = netlbl_domhsh_getentry_af6(secattr->domain, |
|
&ireq->ir_v6_rmt_addr); |
|
if (entry == NULL) { |
|
ret_val = -ENOENT; |
|
goto req_setattr_return; |
|
} |
|
switch (entry->type) { |
|
case NETLBL_NLTYPE_CALIPSO: |
|
ret_val = calipso_req_setattr(req, |
|
entry->calipso, secattr); |
|
break; |
|
case NETLBL_NLTYPE_UNLABELED: |
|
netlbl_req_delattr(req); |
|
ret_val = 0; |
|
break; |
|
default: |
|
ret_val = -ENOENT; |
|
} |
|
break; |
|
#endif /* IPv6 */ |
|
default: |
|
ret_val = -EPROTONOSUPPORT; |
|
} |
|
|
|
req_setattr_return: |
|
rcu_read_unlock(); |
|
return ret_val; |
|
} |
|
|
|
/** |
|
* netlbl_req_delattr - Delete all the NetLabel labels on a socket |
|
* @req: the socket |
|
* |
|
* Description: |
|
* Remove all the NetLabel labeling from @req. |
|
* |
|
*/ |
|
void netlbl_req_delattr(struct request_sock *req) |
|
{ |
|
switch (req->rsk_ops->family) { |
|
case AF_INET: |
|
cipso_v4_req_delattr(req); |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
calipso_req_delattr(req); |
|
break; |
|
#endif /* IPv6 */ |
|
} |
|
} |
|
|
|
/** |
|
* netlbl_skbuff_setattr - Label a packet using the correct protocol |
|
* @skb: the packet |
|
* @family: protocol family |
|
* @secattr: the security attributes |
|
* |
|
* Description: |
|
* 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_skbuff_setattr(struct sk_buff *skb, |
|
u16 family, |
|
const struct netlbl_lsm_secattr *secattr) |
|
{ |
|
int ret_val; |
|
struct iphdr *hdr4; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct ipv6hdr *hdr6; |
|
#endif |
|
struct netlbl_dommap_def *entry; |
|
|
|
rcu_read_lock(); |
|
switch (family) { |
|
case AF_INET: |
|
hdr4 = ip_hdr(skb); |
|
entry = netlbl_domhsh_getentry_af4(secattr->domain, |
|
hdr4->daddr); |
|
if (entry == NULL) { |
|
ret_val = -ENOENT; |
|
goto skbuff_setattr_return; |
|
} |
|
switch (entry->type) { |
|
case NETLBL_NLTYPE_CIPSOV4: |
|
ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso, |
|
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 IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
hdr6 = ipv6_hdr(skb); |
|
entry = netlbl_domhsh_getentry_af6(secattr->domain, |
|
&hdr6->daddr); |
|
if (entry == NULL) { |
|
ret_val = -ENOENT; |
|
goto skbuff_setattr_return; |
|
} |
|
switch (entry->type) { |
|
case NETLBL_NLTYPE_CALIPSO: |
|
ret_val = calipso_skbuff_setattr(skb, entry->calipso, |
|
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 = calipso_skbuff_delattr(skb); |
|
break; |
|
default: |
|
ret_val = -ENOENT; |
|
} |
|
break; |
|
#endif /* IPv6 */ |
|
default: |
|
ret_val = -EPROTONOSUPPORT; |
|
} |
|
|
|
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: |
|
* Examines the given packet to see if a recognized form of packet labeling |
|
* is present, if so it parses the packet label and returns the security |
|
* attributes in @secattr. Returns zero on success, negative values on |
|
* failure. |
|
* |
|
*/ |
|
int netlbl_skbuff_getattr(const struct sk_buff *skb, |
|
u16 family, |
|
struct netlbl_lsm_secattr *secattr) |
|
{ |
|
unsigned char *ptr; |
|
|
|
switch (family) { |
|
case AF_INET: |
|
ptr = cipso_v4_optptr(skb); |
|
if (ptr && cipso_v4_getattr(ptr, secattr) == 0) |
|
return 0; |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
ptr = calipso_optptr(skb); |
|
if (ptr && calipso_getattr(ptr, secattr) == 0) |
|
return 0; |
|
break; |
|
#endif /* IPv6 */ |
|
} |
|
|
|
return netlbl_unlabel_getattr(skb, family, secattr); |
|
} |
|
|
|
/** |
|
* netlbl_skbuff_err - Handle a LSM error on a sk_buff |
|
* @skb: the packet |
|
* @family: the family |
|
* @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 |
|
* a permission denied problem (-EACCES). The correct action is determined |
|
* according to the packet's labeling protocol. |
|
* |
|
*/ |
|
void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway) |
|
{ |
|
switch (family) { |
|
case AF_INET: |
|
if (cipso_v4_optptr(skb)) |
|
cipso_v4_error(skb, error, gateway); |
|
break; |
|
} |
|
} |
|
|
|
/** |
|
* netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches |
|
* |
|
* Description: |
|
* For all of the NetLabel protocols that support some form of label mapping |
|
* cache, invalidate the cache. Returns zero on success, negative values on |
|
* error. |
|
* |
|
*/ |
|
void netlbl_cache_invalidate(void) |
|
{ |
|
cipso_v4_cache_invalidate(); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
calipso_cache_invalidate(); |
|
#endif /* IPv6 */ |
|
} |
|
|
|
/** |
|
* netlbl_cache_add - Add an entry to a NetLabel protocol cache |
|
* @skb: the packet |
|
* @family: the family |
|
* @secattr: the packet's security attributes |
|
* |
|
* Description: |
|
* Add the LSM security attributes for the given packet to the underlying |
|
* NetLabel protocol's label mapping cache. Returns zero on success, negative |
|
* values on error. |
|
* |
|
*/ |
|
int netlbl_cache_add(const struct sk_buff *skb, u16 family, |
|
const struct netlbl_lsm_secattr *secattr) |
|
{ |
|
unsigned char *ptr; |
|
|
|
if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
|
return -ENOMSG; |
|
|
|
switch (family) { |
|
case AF_INET: |
|
ptr = cipso_v4_optptr(skb); |
|
if (ptr) |
|
return cipso_v4_cache_add(ptr, secattr); |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case AF_INET6: |
|
ptr = calipso_optptr(skb); |
|
if (ptr) |
|
return calipso_cache_add(ptr, secattr); |
|
break; |
|
#endif /* IPv6 */ |
|
} |
|
return -ENOMSG; |
|
} |
|
|
|
/* |
|
* Protocol Engine Functions |
|
*/ |
|
|
|
/** |
|
* netlbl_audit_start - Start an audit message |
|
* @type: audit message type |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Start an audit message using the type specified in @type and fill the audit |
|
* message with some fields common to all NetLabel audit messages. This |
|
* function should only be used by protocol engines, not LSMs. Returns a |
|
* pointer to the audit buffer on success, NULL on failure. |
|
* |
|
*/ |
|
struct audit_buffer *netlbl_audit_start(int type, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
return netlbl_audit_start_common(type, audit_info); |
|
} |
|
EXPORT_SYMBOL(netlbl_audit_start); |
|
|
|
/* |
|
* Setup Functions |
|
*/ |
|
|
|
/** |
|
* netlbl_init - Initialize NetLabel |
|
* |
|
* Description: |
|
* Perform the required NetLabel initialization before first use. |
|
* |
|
*/ |
|
static int __init netlbl_init(void) |
|
{ |
|
int ret_val; |
|
|
|
printk(KERN_INFO "NetLabel: Initializing\n"); |
|
printk(KERN_INFO "NetLabel: domain hash size = %u\n", |
|
(1 << NETLBL_DOMHSH_BITSIZE)); |
|
printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n"); |
|
|
|
ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); |
|
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; |
|
|
|
ret_val = netlbl_unlabel_defconf(); |
|
if (ret_val != 0) |
|
goto init_failure; |
|
printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); |
|
|
|
return 0; |
|
|
|
init_failure: |
|
panic("NetLabel: failed to initialize properly (%d)\n", ret_val); |
|
} |
|
|
|
subsys_initcall(netlbl_init);
|
|
|