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Added support for untruncated MD5 and SHA1 HMACs in ESP as used in RFC 4595.

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This requires a Linux kernel >= 2.6.33.
This commit is contained in:
Tobias Brunner
2012-02-27 14:31:19 +01:00
parent 3a2660f189
commit 686cfd4e34
3 changed files with 25 additions and 3 deletions
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src/libhydra/plugins/kernel_netlink/kernel_netlink_ipsec.c
+21 -3
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@@ -202,7 +202,9 @@ static kernel_algorithm_t encryption_algs[] = {
*/
static kernel_algorithm_t integrity_algs[] = {
{AUTH_HMAC_MD5_96, "md5" },
{AUTH_HMAC_MD5_128, "hmac(md5)" },
{AUTH_HMAC_SHA1_96, "sha1" },
{AUTH_HMAC_SHA1_160, "hmac(sha1)" },
{AUTH_HMAC_SHA2_256_96, "sha256" },
{AUTH_HMAC_SHA2_256_128, "hmac(sha256)" },
{AUTH_HMAC_SHA2_384_192, "hmac(sha384)" },
@@ -1279,6 +1281,8 @@ METHOD(kernel_ipsec_t, add_sa, status_t,
if (int_alg != AUTH_UNDEFINED)
{
u_int trunc_len = 0;
alg_name = lookup_algorithm(integrity_algs, int_alg);
if (alg_name == NULL)
{
@@ -1289,12 +1293,26 @@ METHOD(kernel_ipsec_t, add_sa, status_t,
DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
integrity_algorithm_names, int_alg, int_key.len * 8);
if (int_alg == AUTH_HMAC_SHA2_256_128)
switch (int_alg)
{
case AUTH_HMAC_MD5_128:
case AUTH_HMAC_SHA2_256_128:
trunc_len = 128;
break;
case AUTH_HMAC_SHA1_160:
trunc_len = 160;
break;
default:
break;
}
if (trunc_len)
{
struct xfrm_algo_auth* algo;
/* the kernel uses SHA256 with 96 bit truncation by default,
* use specified truncation size supported by newer kernels */
* use specified truncation size supported by newer kernels.
* also use this for untruncated MD5 and SHA1. */
rthdr->rta_type = XFRMA_ALG_AUTH_TRUNC;
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_auth) +
int_key.len);
@@ -1307,7 +1325,7 @@ METHOD(kernel_ipsec_t, add_sa, status_t,
algo = (struct xfrm_algo_auth*)RTA_DATA(rthdr);
algo->alg_key_len = int_key.len * 8;
algo->alg_trunc_len = 128;
algo->alg_trunc_len = trunc_len;
strcpy(algo->alg_name, alg_name);
memcpy(algo->alg_key, int_key.ptr, int_key.len);
}