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NetLabel: add the enumerated tag to the CIPSOv4 protocol
Add support for the enumerated tag (tag type #2) to the CIPSOv4 protocol. The enumerated tag allows for 15 categories to be specified in a CIPSO option, where each category is an unsigned 16 bit field with a maximum value of 65534. 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
0275276035
commit
654bbc2a2b
@ -459,6 +459,10 @@ int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
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if (iter == 0)
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return -EINVAL;
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break;
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case CIPSO_V4_TAG_ENUM:
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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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default:
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return -EINVAL;
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}
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@ -940,6 +944,107 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
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return -EINVAL;
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}
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/**
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* cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid
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* @doi_def: the DOI definition
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* @enumcat: category list
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* @enumcat_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_enum_valid(const struct cipso_v4_doi *doi_def,
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const unsigned char *enumcat,
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u32 enumcat_len)
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{
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u16 cat;
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int cat_prev = -1;
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u32 iter;
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if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01)
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return -EFAULT;
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for (iter = 0; iter < enumcat_len; iter += 2) {
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cat = ntohs(*((__be16 *)&enumcat[iter]));
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if (cat <= cat_prev)
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return -EFAULT;
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cat_prev = 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_map_cat_enum_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_enum_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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int cat = -1;
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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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if (cat < 0)
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break;
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if ((cat_iter + 2) > net_cat_len)
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return -ENOSPC;
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*((__be16 *)&net_cat[cat_iter]) = htons(cat);
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cat_iter += 2;
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}
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return cat_iter;
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}
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/**
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* cipso_v4_map_cat_enum_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_enum_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 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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ntohs(*((__be16 *)&net_cat[iter])),
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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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@ -1067,6 +1172,99 @@ static int cipso_v4_parsetag_rbm(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_enum - Generate a CIPSO enumerated tag (type #2)
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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 enumerated tag, tag type #2. 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_enum(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_enum_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] = 0x02;
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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_enum - Parse a CIPSO enumerated 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 enumerated tag (tag type #2) and return the security
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* attributes in @secattr. Return zero on success, negatives values on
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* failure.
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*
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*/
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static int cipso_v4_parsetag_enum(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_enum_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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@ -1156,6 +1354,25 @@ int cipso_v4_validate(unsigned char **option)
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}
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}
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break;
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case CIPSO_V4_TAG_ENUM:
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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_enum_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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@ -1269,6 +1486,12 @@ 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_ENUM:
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ret_val = cipso_v4_gentag_enum(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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@ -1365,6 +1588,11 @@ 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_ENUM:
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ret_val = cipso_v4_parsetag_enum(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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@ -1431,6 +1659,11 @@ int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
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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_ENUM:
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ret_val = cipso_v4_parsetag_enum(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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skbuff_getattr_return:
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