NetLabel: Add secid token support to the NetLabel secattr struct
This patch adds support to the NetLabel LSM secattr struct for a secid token and a type field, paving the way for full LSM/SELinux context support and "static" or "fallback" labels. In addition, this patch adds a fair amount of documentation to the core NetLabel structures used as part of the NetLabel kernel API. Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore
James Morris
parent
1c3fad936a
commit
16efd45435
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@ -105,17 +105,49 @@ struct netlbl_dom_map;
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/* Domain mapping operations */
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int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
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/* LSM security attributes */
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/*
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* LSM security attributes
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*/
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/**
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* struct netlbl_lsm_cache - NetLabel LSM security attribute cache
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* @refcount: atomic reference counter
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* @free: LSM supplied function to free the cache data
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* @data: LSM supplied cache data
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*
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* Description:
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* This structure is provided for LSMs which wish to make use of the NetLabel
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* caching mechanism to store LSM specific data/attributes in the NetLabel
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* cache. If the LSM has to perform a lot of translation from the NetLabel
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* security attributes into it's own internal representation then the cache
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* mechanism can provide a way to eliminate some or all of that translation
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* overhead on a cache hit.
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*
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*/
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struct netlbl_lsm_cache {
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atomic_t refcount;
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void (*free) (const void *data);
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void *data;
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};
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/* The catmap bitmap field MUST be a power of two in length and large
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/**
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* struct netlbl_lsm_secattr_catmap - NetLabel LSM secattr category bitmap
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* @startbit: the value of the lowest order bit in the bitmap
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* @bitmap: the category bitmap
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* @next: pointer to the next bitmap "node" or NULL
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*
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* Description:
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* This structure is used to represent category bitmaps. Due to the large
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* number of categories supported by most labeling protocols it is not
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* practical to transfer a full bitmap internally so NetLabel adopts a sparse
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* bitmap structure modeled after SELinux's ebitmap structure.
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* The catmap bitmap field MUST be a power of two in length and large
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* enough to hold at least 240 bits. Special care (i.e. check the code!)
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* should be used when changing these values as the LSM implementation
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* probably has functions which rely on the sizes of these types to speed
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* processing. */
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* processing.
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*
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*/
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#define NETLBL_CATMAP_MAPTYPE u64
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#define NETLBL_CATMAP_MAPCNT 4
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#define NETLBL_CATMAP_MAPSIZE (sizeof(NETLBL_CATMAP_MAPTYPE) * 8)
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@ -127,22 +159,48 @@ struct netlbl_lsm_secattr_catmap {
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NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT];
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struct netlbl_lsm_secattr_catmap *next;
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};
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/**
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* struct netlbl_lsm_secattr - NetLabel LSM security attributes
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* @flags: indicate which attributes are contained in this structure
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* @type: indicate the NLTYPE of the attributes
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* @domain: the NetLabel LSM domain
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* @cache: NetLabel LSM specific cache
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* @attr.mls: MLS sensitivity label
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* @attr.mls.cat: MLS category bitmap
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* @attr.mls.lvl: MLS sensitivity level
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* @attr.secid: LSM specific secid token
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*
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* Description:
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* This structure is used to pass security attributes between NetLabel and the
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* LSM modules. The flags field is used to specify which fields within the
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* struct are valid and valid values can be created by bitwise OR'ing the
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* NETLBL_SECATTR_* defines. The domain field is typically set by the LSM to
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* specify domain specific configuration settings and is not usually used by
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* NetLabel itself when returning security attributes to the LSM.
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*
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*/
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#define NETLBL_SECATTR_NONE 0x00000000
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#define NETLBL_SECATTR_DOMAIN 0x00000001
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#define NETLBL_SECATTR_CACHE 0x00000002
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#define NETLBL_SECATTR_MLS_LVL 0x00000004
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#define NETLBL_SECATTR_MLS_CAT 0x00000008
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#define NETLBL_SECATTR_SECID 0x00000010
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#define NETLBL_SECATTR_CACHEABLE (NETLBL_SECATTR_MLS_LVL | \
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NETLBL_SECATTR_MLS_CAT)
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NETLBL_SECATTR_MLS_CAT | \
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NETLBL_SECATTR_SECID)
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struct netlbl_lsm_secattr {
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u32 flags;
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u32 type;
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char *domain;
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u32 mls_lvl;
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struct netlbl_lsm_secattr_catmap *mls_cat;
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struct netlbl_lsm_cache *cache;
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union {
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struct {
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struct netlbl_lsm_secattr_catmap *cat;
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u32 lvl;
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} mls;
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u32 secid;
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} attr;
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};
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/*
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@ -231,10 +289,7 @@ static inline void netlbl_secattr_catmap_free(
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*/
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static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
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{
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secattr->flags = 0;
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secattr->domain = NULL;
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secattr->mls_cat = NULL;
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secattr->cache = NULL;
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memset(secattr, 0, sizeof(*secattr));
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}
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/**
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@ -248,11 +303,11 @@ static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
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*/
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static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr)
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{
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if (secattr->cache)
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netlbl_secattr_cache_free(secattr->cache);
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kfree(secattr->domain);
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if (secattr->mls_cat)
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netlbl_secattr_catmap_free(secattr->mls_cat);
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if (secattr->flags & NETLBL_SECATTR_CACHE)
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netlbl_secattr_cache_free(secattr->cache);
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if (secattr->flags & NETLBL_SECATTR_MLS_CAT)
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netlbl_secattr_catmap_free(secattr->attr.mls.cat);
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}
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/**
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@ -300,7 +355,7 @@ int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
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gfp_t flags);
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/*
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* LSM protocol operations
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* LSM protocol operations (NetLabel LSM/kernel API)
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*/
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int netlbl_enabled(void);
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int netlbl_sock_setattr(struct sock *sk,
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@ -348,6 +348,7 @@ static int cipso_v4_cache_check(const unsigned char *key,
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atomic_inc(&entry->lsm_data->refcount);
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secattr->cache = entry->lsm_data;
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secattr->flags |= NETLBL_SECATTR_CACHE;
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secattr->type = NETLBL_NLTYPE_CIPSOV4;
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if (prev_entry == NULL) {
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spin_unlock_bh(&cipso_v4_cache[bkt].lock);
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return 0;
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@ -865,7 +866,7 @@ static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
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}
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for (;;) {
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host_spot = netlbl_secattr_catmap_walk(secattr->mls_cat,
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host_spot = netlbl_secattr_catmap_walk(secattr->attr.mls.cat,
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host_spot + 1);
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if (host_spot < 0)
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break;
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@ -948,7 +949,7 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
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return -EPERM;
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break;
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}
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ret_val = netlbl_secattr_catmap_setbit(secattr->mls_cat,
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ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat,
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host_spot,
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GFP_ATOMIC);
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if (ret_val != 0)
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@ -1014,7 +1015,8 @@ static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def,
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u32 cat_iter = 0;
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for (;;) {
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cat = netlbl_secattr_catmap_walk(secattr->mls_cat, cat + 1);
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cat = netlbl_secattr_catmap_walk(secattr->attr.mls.cat,
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cat + 1);
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if (cat < 0)
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break;
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if ((cat_iter + 2) > net_cat_len)
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@ -1049,7 +1051,7 @@ static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def,
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u32 iter;
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for (iter = 0; iter < net_cat_len; iter += 2) {
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ret_val = netlbl_secattr_catmap_setbit(secattr->mls_cat,
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ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat,
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ntohs(get_unaligned((__be16 *)&net_cat[iter])),
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GFP_ATOMIC);
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if (ret_val != 0)
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@ -1130,7 +1132,8 @@ static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def,
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return -ENOSPC;
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for (;;) {
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iter = netlbl_secattr_catmap_walk(secattr->mls_cat, iter + 1);
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iter = netlbl_secattr_catmap_walk(secattr->attr.mls.cat,
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iter + 1);
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if (iter < 0)
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break;
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cat_size += (iter == 0 ? 0 : sizeof(u16));
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@ -1138,7 +1141,8 @@ static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def,
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return -ENOSPC;
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array[array_cnt++] = iter;
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iter = netlbl_secattr_catmap_walk_rng(secattr->mls_cat, iter);
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iter = netlbl_secattr_catmap_walk_rng(secattr->attr.mls.cat,
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iter);
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if (iter < 0)
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return -EFAULT;
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cat_size += sizeof(u16);
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@ -1191,7 +1195,7 @@ static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def,
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else
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cat_low = 0;
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ret_val = netlbl_secattr_catmap_setrng(secattr->mls_cat,
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ret_val = netlbl_secattr_catmap_setrng(secattr->attr.mls.cat,
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cat_low,
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cat_high,
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GFP_ATOMIC);
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@ -1251,7 +1255,9 @@ static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def,
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if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0)
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return -EPERM;
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ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
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ret_val = cipso_v4_map_lvl_hton(doi_def,
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secattr->attr.mls.lvl,
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&level);
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if (ret_val != 0)
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return ret_val;
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@ -1303,12 +1309,13 @@ static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def,
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ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
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if (ret_val != 0)
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return ret_val;
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secattr->mls_lvl = level;
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secattr->attr.mls.lvl = level;
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secattr->flags |= NETLBL_SECATTR_MLS_LVL;
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if (tag_len > 4) {
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secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (secattr->mls_cat == NULL)
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secattr->attr.mls.cat =
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netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (secattr->attr.mls.cat == NULL)
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return -ENOMEM;
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ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def,
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@ -1316,7 +1323,7 @@ static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def,
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tag_len - 4,
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secattr);
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if (ret_val != 0) {
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netlbl_secattr_catmap_free(secattr->mls_cat);
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netlbl_secattr_catmap_free(secattr->attr.mls.cat);
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return ret_val;
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}
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@ -1350,7 +1357,9 @@ static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def,
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if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
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return -EPERM;
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ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
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ret_val = cipso_v4_map_lvl_hton(doi_def,
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secattr->attr.mls.lvl,
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&level);
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if (ret_val != 0)
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return ret_val;
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@ -1396,12 +1405,13 @@ static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def,
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ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
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if (ret_val != 0)
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return ret_val;
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secattr->mls_lvl = level;
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secattr->attr.mls.lvl = level;
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secattr->flags |= NETLBL_SECATTR_MLS_LVL;
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if (tag_len > 4) {
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secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (secattr->mls_cat == NULL)
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secattr->attr.mls.cat =
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netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (secattr->attr.mls.cat == NULL)
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return -ENOMEM;
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ret_val = cipso_v4_map_cat_enum_ntoh(doi_def,
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@ -1409,7 +1419,7 @@ static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def,
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tag_len - 4,
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secattr);
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if (ret_val != 0) {
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netlbl_secattr_catmap_free(secattr->mls_cat);
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netlbl_secattr_catmap_free(secattr->attr.mls.cat);
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return ret_val;
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}
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@ -1443,7 +1453,9 @@ static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def,
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if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
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return -EPERM;
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ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
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ret_val = cipso_v4_map_lvl_hton(doi_def,
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secattr->attr.mls.lvl,
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&level);
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if (ret_val != 0)
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return ret_val;
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@ -1488,12 +1500,13 @@ static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
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ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
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if (ret_val != 0)
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return ret_val;
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secattr->mls_lvl = level;
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secattr->attr.mls.lvl = level;
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secattr->flags |= NETLBL_SECATTR_MLS_LVL;
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if (tag_len > 4) {
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secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (secattr->mls_cat == NULL)
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secattr->attr.mls.cat =
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netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (secattr->attr.mls.cat == NULL)
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return -ENOMEM;
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ret_val = cipso_v4_map_cat_rng_ntoh(doi_def,
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@ -1501,7 +1514,7 @@ static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
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tag_len - 4,
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secattr);
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if (ret_val != 0) {
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netlbl_secattr_catmap_free(secattr->mls_cat);
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netlbl_secattr_catmap_free(secattr->attr.mls.cat);
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return ret_val;
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}
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@ -1850,6 +1863,8 @@ static int cipso_v4_getattr(const unsigned char *cipso,
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ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr);
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break;
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}
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if (ret_val == 0)
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secattr->type = NETLBL_NLTYPE_CIPSOV4;
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getattr_return:
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rcu_read_unlock();
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@ -241,6 +241,7 @@ int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
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if (netlabel_unlabel_acceptflg == 0)
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return -ENOMSG;
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netlbl_secattr_init(secattr);
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secattr->type = NETLBL_NLTYPE_UNLABELED;
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return 0;
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}
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@ -562,7 +562,7 @@ void mls_export_netlbl_lvl(struct context *context,
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if (!selinux_mls_enabled)
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return;
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secattr->mls_lvl = context->range.level[0].sens - 1;
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secattr->attr.mls.lvl = context->range.level[0].sens - 1;
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secattr->flags |= NETLBL_SECATTR_MLS_LVL;
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}
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@ -582,7 +582,7 @@ void mls_import_netlbl_lvl(struct context *context,
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if (!selinux_mls_enabled)
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return;
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context->range.level[0].sens = secattr->mls_lvl + 1;
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context->range.level[0].sens = secattr->attr.mls.lvl + 1;
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context->range.level[1].sens = context->range.level[0].sens;
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}
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@ -605,8 +605,8 @@ int mls_export_netlbl_cat(struct context *context,
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return 0;
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rc = ebitmap_netlbl_export(&context->range.level[0].cat,
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&secattr->mls_cat);
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if (rc == 0 && secattr->mls_cat != NULL)
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&secattr->attr.mls.cat);
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if (rc == 0 && secattr->attr.mls.cat != NULL)
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secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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return rc;
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@ -633,7 +633,7 @@ int mls_import_netlbl_cat(struct context *context,
|
|||
return 0;
|
||||
|
||||
rc = ebitmap_netlbl_import(&context->range.level[0].cat,
|
||||
secattr->mls_cat);
|
||||
secattr->attr.mls.cat);
|
||||
if (rc != 0)
|
||||
goto import_netlbl_cat_failure;
|
||||
|
||||
|
|
|
|||
|
|
@ -2550,6 +2550,9 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
|
|||
default:
|
||||
goto netlbl_secattr_to_sid_return;
|
||||
}
|
||||
} else if (secattr->flags & NETLBL_SECATTR_SECID) {
|
||||
*sid = secattr->attr.secid;
|
||||
rc = 0;
|
||||
} else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
|
||||
ctx = sidtab_search(&sidtab, base_sid);
|
||||
if (ctx == NULL)
|
||||
|
|
@ -2561,7 +2564,7 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
|
|||
mls_import_netlbl_lvl(&ctx_new, secattr);
|
||||
if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
|
||||
if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
|
||||
secattr->mls_cat) != 0)
|
||||
secattr->attr.mls.cat) != 0)
|
||||
goto netlbl_secattr_to_sid_return;
|
||||
ctx_new.range.level[1].cat.highbit =
|
||||
ctx_new.range.level[0].cat.highbit;
|
||||
|
|
|
|||
Loading…
Reference in New Issue