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NetLabel: add the ranged tag to the CIPSOv4 protocol
Add support for the ranged tag (tag type #5) to the CIPSOv4 protocol. The ranged tag allows for seven, or eight if zero is the lowest category, category ranges to be specified in a CIPSO option. Each range is specified by two unsigned 16 bit fields, each with a maximum value of 65534. The two values specify the start and end of the category range; if the start of the category range is zero then it is omitted. See Documentation/netlabel/draft-ietf-cipso-ipsecurity-01.txt for more details. Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore
David S. Miller
parent
654bbc2a2b
commit
484b366932
1 changed files with 268 additions and 0 deletions
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@ -455,6 +455,10 @@ int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
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switch (doi_def->tags[iter]) {
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case CIPSO_V4_TAG_RBITMAP:
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break;
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case CIPSO_V4_TAG_RANGE:
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if (doi_def->type != CIPSO_V4_MAP_PASS)
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return -EINVAL;
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break;
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case CIPSO_V4_TAG_INVALID:
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if (iter == 0)
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return -EINVAL;
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@ -1045,6 +1049,148 @@ static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def,
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return 0;
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}
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/**
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* cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid
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* @doi_def: the DOI definition
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* @rngcat: category list
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* @rngcat_len: length of the category list in bytes
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*
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* Description:
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* Checks the given categories against the given DOI definition and returns a
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* negative value if any of the categories do not have a valid mapping and a
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* zero value if all of the categories are valid.
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*
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*/
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static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def,
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const unsigned char *rngcat,
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u32 rngcat_len)
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{
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u16 cat_high;
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u16 cat_low;
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u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1;
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u32 iter;
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if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01)
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return -EFAULT;
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for (iter = 0; iter < rngcat_len; iter += 4) {
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cat_high = ntohs(*((__be16 *)&rngcat[iter]));
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if ((iter + 4) <= rngcat_len)
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cat_low = ntohs(*((__be16 *)&rngcat[iter + 2]));
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else
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cat_low = 0;
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if (cat_high > cat_prev)
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return -EFAULT;
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cat_prev = cat_low;
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}
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return 0;
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}
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/**
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* cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network
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* @doi_def: the DOI definition
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* @secattr: the security attributes
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* @net_cat: the zero'd out category list in network/CIPSO format
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* @net_cat_len: the length of the CIPSO category list in bytes
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*
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* Description:
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* Perform a label mapping to translate a local MLS category bitmap to the
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* correct CIPSO category list using the given DOI definition. Returns the
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* size in bytes of the network category bitmap on success, negative values
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* otherwise.
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*
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*/
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static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr,
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unsigned char *net_cat,
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u32 net_cat_len)
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{
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/* The constant '16' is not random, it is the maximum number of
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* high/low category range pairs as permitted by the CIPSO draft based
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* on a maximum IPv4 header length of 60 bytes - the BUG_ON() assertion
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* does a sanity check to make sure we don't overflow the array. */
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int iter = -1;
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u16 array[16];
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u32 array_cnt = 0;
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u32 cat_size = 0;
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BUG_ON(net_cat_len > 30);
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for (;;) {
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iter = netlbl_secattr_catmap_walk(secattr->mls_cat, 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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if (cat_size > net_cat_len)
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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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if (iter < 0)
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return -EFAULT;
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cat_size += sizeof(u16);
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if (cat_size > net_cat_len)
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return -ENOSPC;
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array[array_cnt++] = iter;
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}
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for (iter = 0; array_cnt > 0;) {
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*((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]);
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iter += 2;
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array_cnt--;
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if (array[array_cnt] != 0) {
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*((__be16 *)&net_cat[iter]) = htons(array[array_cnt]);
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iter += 2;
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}
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}
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return cat_size;
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}
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/**
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* cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host
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* @doi_def: the DOI definition
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* @net_cat: the category list in network/CIPSO format
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* @net_cat_len: the length of the CIPSO bitmap in bytes
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* @secattr: the security attributes
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*
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* Description:
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* Perform a label mapping to translate a CIPSO category list to the correct
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* local MLS category bitmap using the given DOI definition. Returns zero on
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* success, negative values on failure.
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*
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*/
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static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def,
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const unsigned char *net_cat,
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u32 net_cat_len,
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struct netlbl_lsm_secattr *secattr)
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{
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int ret_val;
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u32 net_iter;
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u16 cat_low;
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u16 cat_high;
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for(net_iter = 0; net_iter < net_cat_len; net_iter += 4) {
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cat_high = ntohs(*((__be16 *)&net_cat[net_iter]));
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if ((net_iter + 4) <= net_cat_len)
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cat_low = ntohs(*((__be16 *)&net_cat[net_iter + 2]));
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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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cat_low,
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cat_high,
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GFP_ATOMIC);
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if (ret_val != 0)
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return ret_val;
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}
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return 0;
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}
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/*
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* Protocol Handling Functions
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*/
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@ -1265,6 +1411,98 @@ static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def,
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return 0;
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}
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/**
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* cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5)
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* @doi_def: the DOI definition
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* @secattr: the security attributes
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* @buffer: the option buffer
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* @buffer_len: length of buffer in bytes
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*
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* Description:
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* Generate a CIPSO option using the ranged tag, tag type #5. Returns the
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* size of the tag on success, negative values on failure.
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*
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*/
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static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr,
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unsigned char *buffer,
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u32 buffer_len)
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{
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int ret_val;
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u32 tag_len;
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u32 level;
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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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if (ret_val != 0)
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return ret_val;
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if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
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ret_val = cipso_v4_map_cat_rng_hton(doi_def,
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secattr,
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&buffer[4],
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buffer_len - 4);
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if (ret_val < 0)
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return ret_val;
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tag_len = 4 + ret_val;
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} else
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tag_len = 4;
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buffer[0] = 0x05;
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buffer[1] = tag_len;
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buffer[3] = level;
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return tag_len;
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}
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/**
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* cipso_v4_parsetag_rng - Parse a CIPSO ranged tag
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* @doi_def: the DOI definition
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* @tag: the CIPSO tag
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* @secattr: the security attributes
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*
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* Description:
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* Parse a CIPSO ranged tag (tag type #5) and return the security attributes
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* in @secattr. Return zero on success, negatives values on failure.
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*
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*/
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static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
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const unsigned char *tag,
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struct netlbl_lsm_secattr *secattr)
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{
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int ret_val;
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u8 tag_len = tag[1];
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u32 level;
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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->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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return -ENOMEM;
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ret_val = cipso_v4_map_cat_rng_ntoh(doi_def,
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&tag[4],
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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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return ret_val;
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}
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secattr->flags |= NETLBL_SECATTR_MLS_CAT;
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}
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return 0;
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}
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/**
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* cipso_v4_validate - Validate a CIPSO option
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* @option: the start of the option, on error it is set to point to the error
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@ -1373,6 +1611,25 @@ int cipso_v4_validate(unsigned char **option)
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goto validate_return_locked;
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}
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break;
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case CIPSO_V4_TAG_RANGE:
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if (tag_len < 4) {
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err_offset = opt_iter + 1;
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goto validate_return_locked;
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}
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if (cipso_v4_map_lvl_valid(doi_def,
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tag[3]) < 0) {
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err_offset = opt_iter + 3;
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goto validate_return_locked;
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}
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if (tag_len > 4 &&
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cipso_v4_map_cat_rng_valid(doi_def,
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&tag[4],
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tag_len - 4) < 0) {
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err_offset = opt_iter + 4;
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goto validate_return_locked;
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}
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break;
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default:
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err_offset = opt_iter;
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goto validate_return_locked;
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@ -1492,6 +1749,12 @@ int cipso_v4_socket_setattr(const struct socket *sock,
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&buf[CIPSO_V4_HDR_LEN],
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buf_len - CIPSO_V4_HDR_LEN);
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break;
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case CIPSO_V4_TAG_RANGE:
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ret_val = cipso_v4_gentag_rng(doi_def,
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secattr,
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&buf[CIPSO_V4_HDR_LEN],
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buf_len - CIPSO_V4_HDR_LEN);
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break;
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default:
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ret_val = -EPERM;
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goto socket_setattr_failure;
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@ -1593,6 +1856,11 @@ int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
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&cipso_ptr[6],
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secattr);
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break;
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case CIPSO_V4_TAG_RANGE:
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ret_val = cipso_v4_parsetag_rng(doi_def,
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&cipso_ptr[6],
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secattr);
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break;
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}
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rcu_read_unlock();
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