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Diffstat (limited to '')
| -rw-r--r-- | include/net/netlabel.h | 696 |
1 files changed, 696 insertions, 0 deletions
diff --git a/include/net/netlabel.h b/include/net/netlabel.h new file mode 100644 index 000000000..72d6435fc --- /dev/null +++ b/include/net/netlabel.h @@ -0,0 +1,696 @@ +/* + * NetLabel System + * + * The NetLabel system manages static and dynamic label mappings for network + * protocols such as CIPSO and RIPSO. + * + * Author: Paul Moore <paul@paul-moore.com> + * + */ + +/* + * (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 + * 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, see <http://www.gnu.org/licenses/>. + * + */ + +#ifndef _NETLABEL_H +#define _NETLABEL_H + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/net.h> +#include <linux/skbuff.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <net/netlink.h> +#include <net/request_sock.h> +#include <linux/refcount.h> + +struct cipso_v4_doi; +struct calipso_doi; + +/* + * NetLabel - A management interface for maintaining network packet label + * mapping tables for explicit packet labling protocols. + * + * Network protocols such as CIPSO and RIPSO require a label translation layer + * to convert the label on the packet into something meaningful on the host + * machine. In the current Linux implementation these mapping tables live + * inside the kernel; NetLabel provides a mechanism for user space applications + * to manage these mapping tables. + * + * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to + * send messages between kernel and user space. The general format of a + * NetLabel message is shown below: + * + * +-----------------+-------------------+--------- --- -- - + * | struct nlmsghdr | struct genlmsghdr | payload + * +-----------------+-------------------+--------- --- -- - + * + * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal. + * The payload is dependent on the subsystem specified in the + * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions + * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c + * file. All of the fields in the NetLabel payload are NETLINK attributes, see + * the include/net/netlink.h file for more information on NETLINK attributes. + * + */ + +/* + * NetLabel NETLINK protocol + */ + +/* NetLabel NETLINK protocol version + * 1: initial version + * 2: added static labels for unlabeled connections + * 3: network selectors added to the NetLabel/LSM domain mapping and the + * CIPSO_V4_MAP_LOCAL CIPSO mapping was added + */ +#define NETLBL_PROTO_VERSION 3 + +/* NetLabel NETLINK types/families */ +#define NETLBL_NLTYPE_NONE 0 +#define NETLBL_NLTYPE_MGMT 1 +#define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT" +#define NETLBL_NLTYPE_RIPSO 2 +#define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO" +#define NETLBL_NLTYPE_CIPSOV4 3 +#define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4" +#define NETLBL_NLTYPE_CIPSOV6 4 +#define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6" +#define NETLBL_NLTYPE_UNLABELED 5 +#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL" +#define NETLBL_NLTYPE_ADDRSELECT 6 +#define NETLBL_NLTYPE_ADDRSELECT_NAME "NLBL_ADRSEL" +#define NETLBL_NLTYPE_CALIPSO 7 +#define NETLBL_NLTYPE_CALIPSO_NAME "NLBL_CALIPSO" + +/* + * NetLabel - Kernel API for accessing the network packet label mappings. + * + * The following functions are provided for use by other kernel modules, + * specifically kernel LSM modules, to provide a consistent, transparent API + * for dealing with explicit packet labeling protocols such as CIPSO and + * RIPSO. The functions defined here are implemented in the + * net/netlabel/netlabel_kapi.c file. + * + */ + +/* NetLabel audit information */ +struct netlbl_audit { + u32 secid; + kuid_t loginuid; + unsigned int sessionid; +}; + +/* + * LSM security attributes + */ + +/** + * struct netlbl_lsm_cache - NetLabel LSM security attribute cache + * @refcount: atomic reference counter + * @free: LSM supplied function to free the cache data + * @data: LSM supplied cache data + * + * Description: + * This structure is provided for LSMs which wish to make use of the NetLabel + * caching mechanism to store LSM specific data/attributes in the NetLabel + * cache. If the LSM has to perform a lot of translation from the NetLabel + * security attributes into it's own internal representation then the cache + * mechanism can provide a way to eliminate some or all of that translation + * overhead on a cache hit. + * + */ +struct netlbl_lsm_cache { + refcount_t refcount; + void (*free) (const void *data); + void *data; +}; + +/** + * struct netlbl_lsm_catmap - NetLabel LSM secattr category bitmap + * @startbit: the value of the lowest order bit in the bitmap + * @bitmap: the category bitmap + * @next: pointer to the next bitmap "node" or NULL + * + * Description: + * This structure is used to represent category bitmaps. Due to the large + * number of categories supported by most labeling protocols it is not + * practical to transfer a full bitmap internally so NetLabel adopts a sparse + * bitmap structure modeled after SELinux's ebitmap structure. + * The catmap bitmap field MUST be a power of two in length and large + * enough to hold at least 240 bits. Special care (i.e. check the code!) + * should be used when changing these values as the LSM implementation + * probably has functions which rely on the sizes of these types to speed + * processing. + * + */ +#define NETLBL_CATMAP_MAPTYPE u64 +#define NETLBL_CATMAP_MAPCNT 4 +#define NETLBL_CATMAP_MAPSIZE (sizeof(NETLBL_CATMAP_MAPTYPE) * 8) +#define NETLBL_CATMAP_SIZE (NETLBL_CATMAP_MAPSIZE * \ + NETLBL_CATMAP_MAPCNT) +#define NETLBL_CATMAP_BIT (NETLBL_CATMAP_MAPTYPE)0x01 +struct netlbl_lsm_catmap { + u32 startbit; + NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT]; + struct netlbl_lsm_catmap *next; +}; + +/** + * struct netlbl_lsm_secattr - NetLabel LSM security attributes + * @flags: indicate structure attributes, see NETLBL_SECATTR_* + * @type: indicate the NLTYPE of the attributes + * @domain: the NetLabel LSM domain + * @cache: NetLabel LSM specific cache + * @attr.mls: MLS sensitivity label + * @attr.mls.cat: MLS category bitmap + * @attr.mls.lvl: MLS sensitivity level + * @attr.secid: LSM specific secid token + * + * Description: + * This structure is used to pass security attributes between NetLabel and the + * LSM modules. The flags field is used to specify which fields within the + * struct are valid and valid values can be created by bitwise OR'ing the + * NETLBL_SECATTR_* defines. The domain field is typically set by the LSM to + * specify domain specific configuration settings and is not usually used by + * NetLabel itself when returning security attributes to the LSM. + * + */ +struct netlbl_lsm_secattr { + u32 flags; + /* bitmap values for 'flags' */ +#define NETLBL_SECATTR_NONE 0x00000000 +#define NETLBL_SECATTR_DOMAIN 0x00000001 +#define NETLBL_SECATTR_DOMAIN_CPY (NETLBL_SECATTR_DOMAIN | \ + NETLBL_SECATTR_FREE_DOMAIN) +#define NETLBL_SECATTR_CACHE 0x00000002 +#define NETLBL_SECATTR_MLS_LVL 0x00000004 +#define NETLBL_SECATTR_MLS_CAT 0x00000008 +#define NETLBL_SECATTR_SECID 0x00000010 + /* bitmap meta-values for 'flags' */ +#define NETLBL_SECATTR_FREE_DOMAIN 0x01000000 +#define NETLBL_SECATTR_CACHEABLE (NETLBL_SECATTR_MLS_LVL | \ + NETLBL_SECATTR_MLS_CAT | \ + NETLBL_SECATTR_SECID) + u32 type; + char *domain; + struct netlbl_lsm_cache *cache; + struct { + struct { + struct netlbl_lsm_catmap *cat; + u32 lvl; + } mls; + u32 secid; + } attr; +}; + +/** + * struct netlbl_calipso_ops - NetLabel CALIPSO operations + * @doi_add: add a CALIPSO DOI + * @doi_free: free a CALIPSO DOI + * @doi_getdef: returns a reference to a DOI + * @doi_putdef: releases a reference of a DOI + * @doi_walk: enumerate the DOI list + * @sock_getattr: retrieve the socket's attr + * @sock_setattr: set the socket's attr + * @sock_delattr: remove the socket's attr + * @req_setattr: set the req socket's attr + * @req_delattr: remove the req socket's attr + * @opt_getattr: retrieve attr from memory block + * @skbuff_optptr: find option in packet + * @skbuff_setattr: set the skbuff's attr + * @skbuff_delattr: remove the skbuff's attr + * @cache_invalidate: invalidate cache + * @cache_add: add cache entry + * + * Description: + * This structure is filled out by the CALIPSO engine and passed + * to the NetLabel core via a call to netlbl_calipso_ops_register(). + * It enables the CALIPSO engine (and hence IPv6) to be compiled + * as a module. + */ +struct netlbl_calipso_ops { + int (*doi_add)(struct calipso_doi *doi_def, + struct netlbl_audit *audit_info); + void (*doi_free)(struct calipso_doi *doi_def); + int (*doi_remove)(u32 doi, struct netlbl_audit *audit_info); + struct calipso_doi *(*doi_getdef)(u32 doi); + void (*doi_putdef)(struct calipso_doi *doi_def); + int (*doi_walk)(u32 *skip_cnt, + int (*callback)(struct calipso_doi *doi_def, void *arg), + void *cb_arg); + int (*sock_getattr)(struct sock *sk, + struct netlbl_lsm_secattr *secattr); + int (*sock_setattr)(struct sock *sk, + const struct calipso_doi *doi_def, + const struct netlbl_lsm_secattr *secattr); + void (*sock_delattr)(struct sock *sk); + int (*req_setattr)(struct request_sock *req, + const struct calipso_doi *doi_def, + const struct netlbl_lsm_secattr *secattr); + void (*req_delattr)(struct request_sock *req); + int (*opt_getattr)(const unsigned char *calipso, + struct netlbl_lsm_secattr *secattr); + unsigned char *(*skbuff_optptr)(const struct sk_buff *skb); + int (*skbuff_setattr)(struct sk_buff *skb, + const struct calipso_doi *doi_def, + const struct netlbl_lsm_secattr *secattr); + int (*skbuff_delattr)(struct sk_buff *skb); + void (*cache_invalidate)(void); + int (*cache_add)(const unsigned char *calipso_ptr, + const struct netlbl_lsm_secattr *secattr); +}; + +/* + * LSM security attribute operations (inline) + */ + +/** + * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache + * @flags: the memory allocation flags + * + * Description: + * Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer + * on success, NULL on failure. + * + */ +static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags) +{ + struct netlbl_lsm_cache *cache; + + cache = kzalloc(sizeof(*cache), flags); + if (cache) + refcount_set(&cache->refcount, 1); + return cache; +} + +/** + * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct + * @cache: the struct to free + * + * Description: + * Frees @secattr including all of the internal buffers. + * + */ +static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache) +{ + if (!refcount_dec_and_test(&cache->refcount)) + return; + + if (cache->free) + cache->free(cache->data); + kfree(cache); +} + +/** + * netlbl_catmap_alloc - Allocate a LSM secattr catmap + * @flags: memory allocation flags + * + * Description: + * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL + * on failure. + * + */ +static inline struct netlbl_lsm_catmap *netlbl_catmap_alloc(gfp_t flags) +{ + return kzalloc(sizeof(struct netlbl_lsm_catmap), flags); +} + +/** + * netlbl_catmap_free - Free a LSM secattr catmap + * @catmap: the category bitmap + * + * Description: + * Free a LSM secattr catmap. + * + */ +static inline void netlbl_catmap_free(struct netlbl_lsm_catmap *catmap) +{ + struct netlbl_lsm_catmap *iter; + + while (catmap) { + iter = catmap; + catmap = catmap->next; + kfree(iter); + } +} + +/** + * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct + * @secattr: the struct to initialize + * + * Description: + * Initialize an already allocated netlbl_lsm_secattr struct. + * + */ +static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr) +{ + memset(secattr, 0, sizeof(*secattr)); +} + +/** + * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct + * @secattr: the struct to clear + * + * Description: + * Destroys the @secattr struct, including freeing all of the internal buffers. + * The struct must be reset with a call to netlbl_secattr_init() before reuse. + * + */ +static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr) +{ + if (secattr->flags & NETLBL_SECATTR_FREE_DOMAIN) + kfree(secattr->domain); + if (secattr->flags & NETLBL_SECATTR_CACHE) + netlbl_secattr_cache_free(secattr->cache); + if (secattr->flags & NETLBL_SECATTR_MLS_CAT) + netlbl_catmap_free(secattr->attr.mls.cat); +} + +/** + * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct + * @flags: the memory allocation flags + * + * Description: + * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid + * pointer on success, or NULL on failure. + * + */ +static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags) +{ + return kzalloc(sizeof(struct netlbl_lsm_secattr), flags); +} + +/** + * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct + * @secattr: the struct to free + * + * Description: + * Frees @secattr including all of the internal buffers. + * + */ +static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr) +{ + netlbl_secattr_destroy(secattr); + kfree(secattr); +} + +#ifdef CONFIG_NETLABEL +/* + * LSM configuration operations + */ +int netlbl_cfg_map_del(const char *domain, + u16 family, + const void *addr, + const void *mask, + struct netlbl_audit *audit_info); +int netlbl_cfg_unlbl_map_add(const char *domain, + u16 family, + const void *addr, + const void *mask, + struct netlbl_audit *audit_info); +int netlbl_cfg_unlbl_static_add(struct net *net, + const char *dev_name, + const void *addr, + const void *mask, + u16 family, + u32 secid, + struct netlbl_audit *audit_info); +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); +int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, + struct netlbl_audit *audit_info); +void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info); +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 netlbl_cfg_calipso_add(struct calipso_doi *doi_def, + struct netlbl_audit *audit_info); +void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info); +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); +/* + * LSM security attribute operations + */ +int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset); +int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset); +int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, + u32 *offset, + unsigned long *bitmap); +int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, + u32 bit, + gfp_t flags); +int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, + u32 start, + u32 end, + gfp_t flags); +int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, + u32 offset, + unsigned long bitmap, + gfp_t flags); + +/* Bitmap functions + */ +int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len, + u32 offset, u8 state); +void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state); + +/* + * LSM protocol operations (NetLabel LSM/kernel API) + */ +int netlbl_enabled(void); +int netlbl_sock_setattr(struct sock *sk, + u16 family, + const struct netlbl_lsm_secattr *secattr); +void netlbl_sock_delattr(struct sock *sk); +int netlbl_sock_getattr(struct sock *sk, + struct netlbl_lsm_secattr *secattr); +int netlbl_conn_setattr(struct sock *sk, + struct sockaddr *addr, + const struct netlbl_lsm_secattr *secattr); +int netlbl_req_setattr(struct request_sock *req, + const struct netlbl_lsm_secattr *secattr); +void netlbl_req_delattr(struct request_sock *req); +int netlbl_skbuff_setattr(struct sk_buff *skb, + u16 family, + const struct netlbl_lsm_secattr *secattr); +int netlbl_skbuff_getattr(const struct sk_buff *skb, + u16 family, + struct netlbl_lsm_secattr *secattr); +void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway); + +/* + * LSM label mapping cache operations + */ +void netlbl_cache_invalidate(void); +int netlbl_cache_add(const struct sk_buff *skb, u16 family, + const struct netlbl_lsm_secattr *secattr); + +/* + * Protocol engine operations + */ +struct audit_buffer *netlbl_audit_start(int type, + struct netlbl_audit *audit_info); +#else +static inline int netlbl_cfg_map_del(const char *domain, + u16 family, + const void *addr, + const void *mask, + struct netlbl_audit *audit_info) +{ + return -ENOSYS; +} +static inline int netlbl_cfg_unlbl_map_add(const char *domain, + u16 family, + void *addr, + void *mask, + struct netlbl_audit *audit_info) +{ + return -ENOSYS; +} +static inline int netlbl_cfg_unlbl_static_add(struct net *net, + const char *dev_name, + const void *addr, + const void *mask, + u16 family, + u32 secid, + struct netlbl_audit *audit_info) +{ + return -ENOSYS; +} +static inline 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) +{ + return -ENOSYS; +} +static inline int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, + struct netlbl_audit *audit_info) +{ + return -ENOSYS; +} +static inline void netlbl_cfg_cipsov4_del(u32 doi, + struct netlbl_audit *audit_info) +{ + return; +} +static inline 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) +{ + return -ENOSYS; +} +static inline int netlbl_cfg_calipso_add(struct calipso_doi *doi_def, + struct netlbl_audit *audit_info) +{ + return -ENOSYS; +} +static inline void netlbl_cfg_calipso_del(u32 doi, + struct netlbl_audit *audit_info) +{ + return; +} +static inline 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) +{ + return -ENOSYS; +} +static inline int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, + u32 offset) +{ + return -ENOENT; +} +static inline int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, + u32 offset) +{ + return -ENOENT; +} +static inline int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, + u32 *offset, + unsigned long *bitmap) +{ + return 0; +} +static inline int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, + u32 bit, + gfp_t flags) +{ + return 0; +} +static inline int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, + u32 start, + u32 end, + gfp_t flags) +{ + return 0; +} +static inline int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, + u32 offset, + unsigned long bitmap, + gfp_t flags) +{ + return 0; +} +static inline int netlbl_enabled(void) +{ + return 0; +} +static inline int netlbl_sock_setattr(struct sock *sk, + u16 family, + const struct netlbl_lsm_secattr *secattr) +{ + return -ENOSYS; +} +static inline void netlbl_sock_delattr(struct sock *sk) +{ +} +static inline int netlbl_sock_getattr(struct sock *sk, + struct netlbl_lsm_secattr *secattr) +{ + return -ENOSYS; +} +static inline int netlbl_conn_setattr(struct sock *sk, + struct sockaddr *addr, + const struct netlbl_lsm_secattr *secattr) +{ + return -ENOSYS; +} +static inline int netlbl_req_setattr(struct request_sock *req, + const struct netlbl_lsm_secattr *secattr) +{ + return -ENOSYS; +} +static inline void netlbl_req_delattr(struct request_sock *req) +{ + return; +} +static inline int netlbl_skbuff_setattr(struct sk_buff *skb, + u16 family, + const struct netlbl_lsm_secattr *secattr) +{ + return -ENOSYS; +} +static inline int netlbl_skbuff_getattr(const struct sk_buff *skb, + u16 family, + struct netlbl_lsm_secattr *secattr) +{ + return -ENOSYS; +} +static inline void netlbl_skbuff_err(struct sk_buff *skb, + int error, + int gateway) +{ + return; +} +static inline void netlbl_cache_invalidate(void) +{ + return; +} +static inline int netlbl_cache_add(const struct sk_buff *skb, u16 family, + const struct netlbl_lsm_secattr *secattr) +{ + return 0; +} +static inline struct audit_buffer *netlbl_audit_start(int type, + struct netlbl_audit *audit_info) +{ + return NULL; +} +#endif /* CONFIG_NETLABEL */ + +const struct netlbl_calipso_ops * +netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops); + +#endif /* _NETLABEL_H */ |