EAP-pwd: Replace direct OpenSSL HMAC use with wrapper
This is a step towards allowing EAP-pwd to be supported with other crypto libraries. Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
parent
d9cc4646eb
commit
daf10baf9e
4 changed files with 148 additions and 123 deletions
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@ -8,70 +8,76 @@
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#include "includes.h"
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#include "includes.h"
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#include "common.h"
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#include "common.h"
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#include "crypto/sha256.h"
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#include "crypto/crypto.h"
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#include "eap_defs.h"
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#include "eap_defs.h"
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#include "eap_pwd_common.h"
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#include "eap_pwd_common.h"
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/* The random function H(x) = HMAC-SHA256(0^32, x) */
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/* The random function H(x) = HMAC-SHA256(0^32, x) */
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void H_Init(HMAC_CTX *ctx)
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struct crypto_hash * eap_pwd_h_init(void)
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{
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{
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u8 allzero[SHA256_DIGEST_LENGTH];
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u8 allzero[SHA256_MAC_LEN];
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os_memset(allzero, 0, SHA256_MAC_LEN);
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os_memset(allzero, 0, SHA256_DIGEST_LENGTH);
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return crypto_hash_init(CRYPTO_HASH_ALG_HMAC_SHA256, allzero,
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HMAC_Init(ctx, allzero, SHA256_DIGEST_LENGTH, EVP_sha256());
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SHA256_MAC_LEN);
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}
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}
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void H_Update(HMAC_CTX *ctx, const u8 *data, int len)
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void eap_pwd_h_update(struct crypto_hash *hash, const u8 *data, size_t len)
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{
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{
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HMAC_Update(ctx, data, len);
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crypto_hash_update(hash, data, len);
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}
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}
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void H_Final(HMAC_CTX *ctx, u8 *digest)
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void eap_pwd_h_final(struct crypto_hash *hash, u8 *digest)
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{
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{
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unsigned int mdlen = SHA256_DIGEST_LENGTH;
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size_t len = SHA256_MAC_LEN;
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crypto_hash_finish(hash, digest, &len);
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HMAC_Final(ctx, digest, &mdlen);
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HMAC_CTX_cleanup(ctx);
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}
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}
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/* a counter-based KDF based on NIST SP800-108 */
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/* a counter-based KDF based on NIST SP800-108 */
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void eap_pwd_kdf(u8 *key, int keylen, u8 *label, int labellen,
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static int eap_pwd_kdf(const u8 *key, size_t keylen, const u8 *label,
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u8 *result, int resultbitlen)
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size_t labellen, u8 *result, size_t resultbitlen)
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{
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{
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HMAC_CTX hctx;
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struct crypto_hash *hash;
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unsigned char digest[SHA256_DIGEST_LENGTH];
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u8 digest[SHA256_MAC_LEN];
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u16 i, ctr, L;
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u16 i, ctr, L;
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int resultbytelen, len = 0;
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size_t resultbytelen, len = 0, mdlen;
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unsigned int mdlen = SHA256_DIGEST_LENGTH;
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unsigned char mask = 0xff;
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resultbytelen = (resultbitlen + 7)/8;
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resultbytelen = (resultbitlen + 7) / 8;
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ctr = 0;
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ctr = 0;
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L = htons(resultbitlen);
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L = htons(resultbitlen);
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while (len < resultbytelen) {
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while (len < resultbytelen) {
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ctr++; i = htons(ctr);
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ctr++;
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HMAC_Init(&hctx, key, keylen, EVP_sha256());
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i = htons(ctr);
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hash = crypto_hash_init(CRYPTO_HASH_ALG_HMAC_SHA256,
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key, keylen);
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if (hash == NULL)
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return -1;
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if (ctr > 1)
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if (ctr > 1)
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HMAC_Update(&hctx, digest, mdlen);
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crypto_hash_update(hash, digest, SHA256_MAC_LEN);
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HMAC_Update(&hctx, (u8 *) &i, sizeof(u16));
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crypto_hash_update(hash, (u8 *) &i, sizeof(u16));
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HMAC_Update(&hctx, label, labellen);
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crypto_hash_update(hash, label, labellen);
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HMAC_Update(&hctx, (u8 *) &L, sizeof(u16));
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crypto_hash_update(hash, (u8 *) &L, sizeof(u16));
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HMAC_Final(&hctx, digest, &mdlen);
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mdlen = SHA256_MAC_LEN;
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if ((len + (int) mdlen) > resultbytelen)
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if (crypto_hash_finish(hash, digest, &mdlen) < 0)
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return -1;
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if ((len + mdlen) > resultbytelen)
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os_memcpy(result + len, digest, resultbytelen - len);
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os_memcpy(result + len, digest, resultbytelen - len);
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else
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else
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os_memcpy(result + len, digest, mdlen);
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os_memcpy(result + len, digest, mdlen);
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len += mdlen;
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len += mdlen;
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HMAC_CTX_cleanup(&hctx);
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}
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}
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/* since we're expanding to a bit length, mask off the excess */
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/* since we're expanding to a bit length, mask off the excess */
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if (resultbitlen % 8) {
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if (resultbitlen % 8) {
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u8 mask = 0xff;
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mask <<= (8 - (resultbitlen % 8));
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mask <<= (8 - (resultbitlen % 8));
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result[resultbytelen - 1] &= mask;
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result[resultbytelen - 1] &= mask;
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}
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}
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return 0;
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}
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}
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@ -85,9 +91,10 @@ int compute_password_element(EAP_PWD_group *grp, u16 num,
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u8 *id_peer, int id_peer_len, u8 *token)
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u8 *id_peer, int id_peer_len, u8 *token)
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{
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{
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BIGNUM *x_candidate = NULL, *rnd = NULL, *cofactor = NULL;
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BIGNUM *x_candidate = NULL, *rnd = NULL, *cofactor = NULL;
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HMAC_CTX ctx;
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struct crypto_hash *hash;
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unsigned char pwe_digest[SHA256_DIGEST_LENGTH], *prfbuf = NULL, ctr;
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unsigned char pwe_digest[SHA256_MAC_LEN], *prfbuf = NULL, ctr;
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int nid, is_odd, primebitlen, primebytelen, ret = 0;
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int nid, is_odd, ret = 0;
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size_t primebytelen, primebitlen;
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switch (num) { /* from IANA registry for IKE D-H groups */
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switch (num) { /* from IANA registry for IKE D-H groups */
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case 19:
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case 19:
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@ -167,20 +174,23 @@ int compute_password_element(EAP_PWD_group *grp, u16 num,
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* pwd-seed = H(token | peer-id | server-id | password |
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* pwd-seed = H(token | peer-id | server-id | password |
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* counter)
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* counter)
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*/
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*/
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H_Init(&ctx);
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hash = eap_pwd_h_init();
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H_Update(&ctx, token, sizeof(u32));
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if (hash == NULL)
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H_Update(&ctx, id_peer, id_peer_len);
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goto fail;
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H_Update(&ctx, id_server, id_server_len);
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eap_pwd_h_update(hash, token, sizeof(u32));
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H_Update(&ctx, password, password_len);
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eap_pwd_h_update(hash, id_peer, id_peer_len);
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H_Update(&ctx, &ctr, sizeof(ctr));
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eap_pwd_h_update(hash, id_server, id_server_len);
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H_Final(&ctx, pwe_digest);
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eap_pwd_h_update(hash, password, password_len);
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eap_pwd_h_update(hash, &ctr, sizeof(ctr));
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eap_pwd_h_final(hash, pwe_digest);
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BN_bin2bn(pwe_digest, SHA256_DIGEST_LENGTH, rnd);
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BN_bin2bn(pwe_digest, SHA256_MAC_LEN, rnd);
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eap_pwd_kdf(pwe_digest, SHA256_DIGEST_LENGTH,
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if (eap_pwd_kdf(pwe_digest, SHA256_MAC_LEN,
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(unsigned char *) "EAP-pwd Hunting And Pecking",
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(u8 *) "EAP-pwd Hunting And Pecking",
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os_strlen("EAP-pwd Hunting And Pecking"),
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os_strlen("EAP-pwd Hunting And Pecking"),
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prfbuf, primebitlen);
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prfbuf, primebitlen) < 0)
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goto fail;
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BN_bin2bn(prfbuf, primebytelen, x_candidate);
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BN_bin2bn(prfbuf, primebytelen, x_candidate);
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@ -276,9 +286,9 @@ int compute_keys(EAP_PWD_group *grp, BN_CTX *bnctx, BIGNUM *k,
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u8 *confirm_peer, u8 *confirm_server,
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u8 *confirm_peer, u8 *confirm_server,
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u32 *ciphersuite, u8 *msk, u8 *emsk)
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u32 *ciphersuite, u8 *msk, u8 *emsk)
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{
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{
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HMAC_CTX ctx;
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struct crypto_hash *hash;
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u8 mk[SHA256_DIGEST_LENGTH], *cruft;
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u8 mk[SHA256_MAC_LEN], *cruft;
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u8 session_id[SHA256_DIGEST_LENGTH + 1];
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u8 session_id[SHA256_MAC_LEN + 1];
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u8 msk_emsk[EAP_MSK_LEN + EAP_EMSK_LEN];
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u8 msk_emsk[EAP_MSK_LEN + EAP_EMSK_LEN];
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int offset;
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int offset;
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@ -290,37 +300,46 @@ int compute_keys(EAP_PWD_group *grp, BN_CTX *bnctx, BIGNUM *k,
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* scal_s)
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* scal_s)
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*/
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*/
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session_id[0] = EAP_TYPE_PWD;
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session_id[0] = EAP_TYPE_PWD;
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H_Init(&ctx);
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hash = eap_pwd_h_init();
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H_Update(&ctx, (u8 *)ciphersuite, sizeof(u32));
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if (hash == NULL) {
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os_free(cruft);
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return -1;
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}
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eap_pwd_h_update(hash, (u8 *) ciphersuite, sizeof(u32));
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offset = BN_num_bytes(grp->order) - BN_num_bytes(peer_scalar);
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offset = BN_num_bytes(grp->order) - BN_num_bytes(peer_scalar);
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os_memset(cruft, 0, BN_num_bytes(grp->prime));
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os_memset(cruft, 0, BN_num_bytes(grp->prime));
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BN_bn2bin(peer_scalar, cruft + offset);
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BN_bn2bin(peer_scalar, cruft + offset);
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H_Update(&ctx, cruft, BN_num_bytes(grp->order));
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eap_pwd_h_update(hash, cruft, BN_num_bytes(grp->order));
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offset = BN_num_bytes(grp->order) - BN_num_bytes(server_scalar);
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offset = BN_num_bytes(grp->order) - BN_num_bytes(server_scalar);
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os_memset(cruft, 0, BN_num_bytes(grp->prime));
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os_memset(cruft, 0, BN_num_bytes(grp->prime));
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BN_bn2bin(server_scalar, cruft + offset);
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BN_bn2bin(server_scalar, cruft + offset);
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H_Update(&ctx, cruft, BN_num_bytes(grp->order));
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eap_pwd_h_update(hash, cruft, BN_num_bytes(grp->order));
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H_Final(&ctx, &session_id[1]);
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eap_pwd_h_final(hash, &session_id[1]);
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/* then compute MK = H(k | confirm-peer | confirm-server) */
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/* then compute MK = H(k | confirm-peer | confirm-server) */
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H_Init(&ctx);
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hash = eap_pwd_h_init();
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if (hash == NULL) {
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os_free(cruft);
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return -1;
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}
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offset = BN_num_bytes(grp->prime) - BN_num_bytes(k);
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offset = BN_num_bytes(grp->prime) - BN_num_bytes(k);
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os_memset(cruft, 0, BN_num_bytes(grp->prime));
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os_memset(cruft, 0, BN_num_bytes(grp->prime));
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BN_bn2bin(k, cruft + offset);
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BN_bn2bin(k, cruft + offset);
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H_Update(&ctx, cruft, BN_num_bytes(grp->prime));
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eap_pwd_h_update(hash, cruft, BN_num_bytes(grp->prime));
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H_Update(&ctx, confirm_peer, SHA256_DIGEST_LENGTH);
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os_free(cruft);
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H_Update(&ctx, confirm_server, SHA256_DIGEST_LENGTH);
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eap_pwd_h_update(hash, confirm_peer, SHA256_MAC_LEN);
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H_Final(&ctx, mk);
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eap_pwd_h_update(hash, confirm_server, SHA256_MAC_LEN);
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eap_pwd_h_final(hash, mk);
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/* stretch the mk with the session-id to get MSK | EMSK */
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/* stretch the mk with the session-id to get MSK | EMSK */
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eap_pwd_kdf(mk, SHA256_DIGEST_LENGTH,
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if (eap_pwd_kdf(mk, SHA256_MAC_LEN,
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session_id, SHA256_DIGEST_LENGTH+1,
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session_id, SHA256_MAC_LEN + 1,
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msk_emsk, (EAP_MSK_LEN + EAP_EMSK_LEN) * 8);
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msk_emsk, (EAP_MSK_LEN + EAP_EMSK_LEN) * 8) < 0) {
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return -1;
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}
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os_memcpy(msk, msk_emsk, EAP_MSK_LEN);
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os_memcpy(msk, msk_emsk, EAP_MSK_LEN);
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os_memcpy(emsk, msk_emsk + EAP_MSK_LEN, EAP_EMSK_LEN);
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os_memcpy(emsk, msk_emsk + EAP_MSK_LEN, EAP_EMSK_LEN);
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os_free(cruft);
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return 1;
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return 1;
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}
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}
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#define EAP_PWD_COMMON_H
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#define EAP_PWD_COMMON_H
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#include <openssl/bn.h>
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#include <openssl/bn.h>
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#include <openssl/sha.h>
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#include <openssl/ec.h>
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#include <openssl/ec.h>
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#include <openssl/evp.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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/*
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/*
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* definition of a finite cyclic group
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* definition of a finite cyclic group
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@ -62,8 +60,8 @@ int compute_password_element(EAP_PWD_group *, u16, u8 *, int, u8 *, int, u8 *,
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int, u8 *);
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int, u8 *);
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int compute_keys(EAP_PWD_group *, BN_CTX *, BIGNUM *, BIGNUM *, BIGNUM *,
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int compute_keys(EAP_PWD_group *, BN_CTX *, BIGNUM *, BIGNUM *, BIGNUM *,
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u8 *, u8 *, u32 *, u8 *, u8 *);
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u8 *, u8 *, u32 *, u8 *, u8 *);
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void H_Init(HMAC_CTX *);
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struct crypto_hash * eap_pwd_h_init(void);
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void H_Update(HMAC_CTX *, const u8 *, int);
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void eap_pwd_h_update(struct crypto_hash *hash, const u8 *data, size_t len);
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void H_Final(HMAC_CTX *, u8 *);
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void eap_pwd_h_final(struct crypto_hash *hash, u8 *digest);
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#endif /* EAP_PWD_COMMON_H */
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#endif /* EAP_PWD_COMMON_H */
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@ -9,6 +9,7 @@
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#include "includes.h"
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#include "includes.h"
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#include "common.h"
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#include "common.h"
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#include "crypto/sha256.h"
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#include "eap_peer/eap_i.h"
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#include "eap_peer/eap_i.h"
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#include "eap_common/eap_pwd_common.h"
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#include "eap_common/eap_pwd_common.h"
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@ -459,10 +460,10 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
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const u8 *payload, size_t payload_len)
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const u8 *payload, size_t payload_len)
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{
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{
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BIGNUM *x = NULL, *y = NULL;
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BIGNUM *x = NULL, *y = NULL;
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HMAC_CTX ctx;
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struct crypto_hash *hash;
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u32 cs;
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u32 cs;
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u16 grp;
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u16 grp;
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u8 conf[SHA256_DIGEST_LENGTH], *cruft = NULL, *ptr;
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u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr;
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int offset;
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int offset;
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/*
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/*
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@ -489,7 +490,9 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
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* server's commit is H(k | server_element | server_scalar |
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* server's commit is H(k | server_element | server_scalar |
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* peer_element | peer_scalar | ciphersuite)
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* peer_element | peer_scalar | ciphersuite)
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*/
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*/
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H_Init(&ctx);
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hash = eap_pwd_h_init();
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if (hash == NULL)
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goto fin;
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/*
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/*
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* zero the memory each time because this is mod prime math and some
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* zero the memory each time because this is mod prime math and some
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@ -498,7 +501,7 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
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os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
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os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
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offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
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offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
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BN_bn2bin(data->k, cruft + offset);
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BN_bn2bin(data->k, cruft + offset);
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H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
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eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
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/* server element: x, y */
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/* server element: x, y */
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if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
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if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
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@ -511,18 +514,18 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
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os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
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os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
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offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
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offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
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BN_bn2bin(x, cruft + offset);
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BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* server scalar */
|
/* server scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->server_scalar);
|
BN_num_bytes(data->server_scalar);
|
||||||
BN_bn2bin(data->server_scalar, cruft + offset);
|
BN_bn2bin(data->server_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* my element: x, y */
|
/* my element: x, y */
|
||||||
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
||||||
|
@ -536,27 +539,27 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
||||||
BN_bn2bin(x, cruft + offset);
|
BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* my scalar */
|
/* my scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->my_scalar);
|
BN_num_bytes(data->my_scalar);
|
||||||
BN_bn2bin(data->my_scalar, cruft + offset);
|
BN_bn2bin(data->my_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* the ciphersuite */
|
/* the ciphersuite */
|
||||||
H_Update(&ctx, (u8 *) &cs, sizeof(u32));
|
eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32));
|
||||||
|
|
||||||
/* random function fin */
|
/* random function fin */
|
||||||
H_Final(&ctx, conf);
|
eap_pwd_h_final(hash, conf);
|
||||||
|
|
||||||
ptr = (u8 *) payload;
|
ptr = (u8 *) payload;
|
||||||
if (os_memcmp(conf, ptr, SHA256_DIGEST_LENGTH)) {
|
if (os_memcmp(conf, ptr, SHA256_MAC_LEN)) {
|
||||||
wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm did not verify");
|
wpa_printf(MSG_INFO, "EAP-PWD (peer): confirm did not verify");
|
||||||
goto fin;
|
goto fin;
|
||||||
}
|
}
|
||||||
|
@ -568,13 +571,15 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
* H(k | peer_element | peer_scalar | server_element | server_scalar |
|
* H(k | peer_element | peer_scalar | server_element | server_scalar |
|
||||||
* ciphersuite)
|
* ciphersuite)
|
||||||
*/
|
*/
|
||||||
H_Init(&ctx);
|
hash = eap_pwd_h_init();
|
||||||
|
if (hash == NULL)
|
||||||
|
goto fin;
|
||||||
|
|
||||||
/* k */
|
/* k */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
|
||||||
BN_bn2bin(data->k, cruft + offset);
|
BN_bn2bin(data->k, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* my element */
|
/* my element */
|
||||||
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
||||||
|
@ -587,18 +592,18 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
||||||
BN_bn2bin(x, cruft + offset);
|
BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* my scalar */
|
/* my scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->my_scalar);
|
BN_num_bytes(data->my_scalar);
|
||||||
BN_bn2bin(data->my_scalar, cruft + offset);
|
BN_bn2bin(data->my_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* server element: x, y */
|
/* server element: x, y */
|
||||||
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
||||||
|
@ -611,24 +616,24 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
||||||
BN_bn2bin(x, cruft + offset);
|
BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* server scalar */
|
/* server scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->server_scalar);
|
BN_num_bytes(data->server_scalar);
|
||||||
BN_bn2bin(data->server_scalar, cruft + offset);
|
BN_bn2bin(data->server_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* the ciphersuite */
|
/* the ciphersuite */
|
||||||
H_Update(&ctx, (u8 *) &cs, sizeof(u32));
|
eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32));
|
||||||
|
|
||||||
/* all done */
|
/* all done */
|
||||||
H_Final(&ctx, conf);
|
eap_pwd_h_final(hash, conf);
|
||||||
|
|
||||||
if (compute_keys(data->grp, data->bnctx, data->k,
|
if (compute_keys(data->grp, data->bnctx, data->k,
|
||||||
data->my_scalar, data->server_scalar, conf, ptr,
|
data->my_scalar, data->server_scalar, conf, ptr,
|
||||||
|
@ -638,11 +643,11 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
goto fin;
|
goto fin;
|
||||||
}
|
}
|
||||||
|
|
||||||
data->outbuf = wpabuf_alloc(SHA256_DIGEST_LENGTH);
|
data->outbuf = wpabuf_alloc(SHA256_MAC_LEN);
|
||||||
if (data->outbuf == NULL)
|
if (data->outbuf == NULL)
|
||||||
goto fin;
|
goto fin;
|
||||||
|
|
||||||
wpabuf_put_data(data->outbuf, conf, SHA256_DIGEST_LENGTH);
|
wpabuf_put_data(data->outbuf, conf, SHA256_MAC_LEN);
|
||||||
|
|
||||||
fin:
|
fin:
|
||||||
os_free(cruft);
|
os_free(cruft);
|
||||||
|
|
|
@ -9,6 +9,7 @@
|
||||||
#include "includes.h"
|
#include "includes.h"
|
||||||
|
|
||||||
#include "common.h"
|
#include "common.h"
|
||||||
|
#include "crypto/sha256.h"
|
||||||
#include "eap_server/eap_i.h"
|
#include "eap_server/eap_i.h"
|
||||||
#include "eap_common/eap_pwd_common.h"
|
#include "eap_common/eap_pwd_common.h"
|
||||||
|
|
||||||
|
@ -40,7 +41,7 @@ struct eap_pwd_data {
|
||||||
EC_POINT *my_element;
|
EC_POINT *my_element;
|
||||||
EC_POINT *peer_element;
|
EC_POINT *peer_element;
|
||||||
|
|
||||||
u8 my_confirm[SHA256_DIGEST_LENGTH];
|
u8 my_confirm[SHA256_MAC_LEN];
|
||||||
|
|
||||||
u8 msk[EAP_MSK_LEN];
|
u8 msk[EAP_MSK_LEN];
|
||||||
u8 emsk[EAP_EMSK_LEN];
|
u8 emsk[EAP_EMSK_LEN];
|
||||||
|
@ -288,8 +289,8 @@ static void eap_pwd_build_confirm_req(struct eap_sm *sm,
|
||||||
struct eap_pwd_data *data, u8 id)
|
struct eap_pwd_data *data, u8 id)
|
||||||
{
|
{
|
||||||
BIGNUM *x = NULL, *y = NULL;
|
BIGNUM *x = NULL, *y = NULL;
|
||||||
HMAC_CTX ctx;
|
struct crypto_hash *hash;
|
||||||
u8 conf[SHA256_DIGEST_LENGTH], *cruft = NULL, *ptr;
|
u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr;
|
||||||
u16 grp;
|
u16 grp;
|
||||||
int offset;
|
int offset;
|
||||||
|
|
||||||
|
@ -313,7 +314,9 @@ static void eap_pwd_build_confirm_req(struct eap_sm *sm,
|
||||||
* commit is H(k | server_element | server_scalar | peer_element |
|
* commit is H(k | server_element | server_scalar | peer_element |
|
||||||
* peer_scalar | ciphersuite)
|
* peer_scalar | ciphersuite)
|
||||||
*/
|
*/
|
||||||
H_Init(&ctx);
|
hash = eap_pwd_h_init();
|
||||||
|
if (hash == NULL)
|
||||||
|
goto fin;
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Zero the memory each time because this is mod prime math and some
|
* Zero the memory each time because this is mod prime math and some
|
||||||
|
@ -324,7 +327,7 @@ static void eap_pwd_build_confirm_req(struct eap_sm *sm,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
|
||||||
BN_bn2bin(data->k, cruft + offset);
|
BN_bn2bin(data->k, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* server element: x, y */
|
/* server element: x, y */
|
||||||
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
||||||
|
@ -338,18 +341,18 @@ static void eap_pwd_build_confirm_req(struct eap_sm *sm,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
||||||
BN_bn2bin(x, cruft + offset);
|
BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* server scalar */
|
/* server scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->my_scalar);
|
BN_num_bytes(data->my_scalar);
|
||||||
BN_bn2bin(data->my_scalar, cruft + offset);
|
BN_bn2bin(data->my_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* peer element: x, y */
|
/* peer element: x, y */
|
||||||
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
||||||
|
@ -363,18 +366,18 @@ static void eap_pwd_build_confirm_req(struct eap_sm *sm,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
||||||
BN_bn2bin(x, cruft + offset);
|
BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* peer scalar */
|
/* peer scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->peer_scalar);
|
BN_num_bytes(data->peer_scalar);
|
||||||
BN_bn2bin(data->peer_scalar, cruft + offset);
|
BN_bn2bin(data->peer_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* ciphersuite */
|
/* ciphersuite */
|
||||||
grp = htons(data->group_num);
|
grp = htons(data->group_num);
|
||||||
|
@ -386,17 +389,17 @@ static void eap_pwd_build_confirm_req(struct eap_sm *sm,
|
||||||
ptr += sizeof(u8);
|
ptr += sizeof(u8);
|
||||||
*ptr = EAP_PWD_DEFAULT_PRF;
|
*ptr = EAP_PWD_DEFAULT_PRF;
|
||||||
ptr += sizeof(u8);
|
ptr += sizeof(u8);
|
||||||
H_Update(&ctx, cruft, ptr-cruft);
|
eap_pwd_h_update(hash, cruft, ptr - cruft);
|
||||||
|
|
||||||
/* all done with the random function */
|
/* all done with the random function */
|
||||||
H_Final(&ctx, conf);
|
eap_pwd_h_final(hash, conf);
|
||||||
os_memcpy(data->my_confirm, conf, SHA256_DIGEST_LENGTH);
|
os_memcpy(data->my_confirm, conf, SHA256_MAC_LEN);
|
||||||
|
|
||||||
data->outbuf = wpabuf_alloc(SHA256_DIGEST_LENGTH);
|
data->outbuf = wpabuf_alloc(SHA256_MAC_LEN);
|
||||||
if (data->outbuf == NULL)
|
if (data->outbuf == NULL)
|
||||||
goto fin;
|
goto fin;
|
||||||
|
|
||||||
wpabuf_put_data(data->outbuf, conf, SHA256_DIGEST_LENGTH);
|
wpabuf_put_data(data->outbuf, conf, SHA256_MAC_LEN);
|
||||||
|
|
||||||
fin:
|
fin:
|
||||||
os_free(cruft);
|
os_free(cruft);
|
||||||
|
@ -404,8 +407,6 @@ fin:
|
||||||
BN_free(y);
|
BN_free(y);
|
||||||
if (data->outbuf == NULL)
|
if (data->outbuf == NULL)
|
||||||
eap_pwd_state(data, FAILURE);
|
eap_pwd_state(data, FAILURE);
|
||||||
|
|
||||||
return;
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
|
@ -735,10 +736,10 @@ eap_pwd_process_confirm_resp(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
const u8 *payload, size_t payload_len)
|
const u8 *payload, size_t payload_len)
|
||||||
{
|
{
|
||||||
BIGNUM *x = NULL, *y = NULL;
|
BIGNUM *x = NULL, *y = NULL;
|
||||||
HMAC_CTX ctx;
|
struct crypto_hash *hash;
|
||||||
u32 cs;
|
u32 cs;
|
||||||
u16 grp;
|
u16 grp;
|
||||||
u8 conf[SHA256_DIGEST_LENGTH], *cruft = NULL, *ptr;
|
u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr;
|
||||||
int offset;
|
int offset;
|
||||||
|
|
||||||
/* build up the ciphersuite: group | random_function | prf */
|
/* build up the ciphersuite: group | random_function | prf */
|
||||||
|
@ -761,13 +762,15 @@ eap_pwd_process_confirm_resp(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
* commit is H(k | peer_element | peer_scalar | server_element |
|
* commit is H(k | peer_element | peer_scalar | server_element |
|
||||||
* server_scalar | ciphersuite)
|
* server_scalar | ciphersuite)
|
||||||
*/
|
*/
|
||||||
H_Init(&ctx);
|
hash = eap_pwd_h_init();
|
||||||
|
if (hash == NULL)
|
||||||
|
goto fin;
|
||||||
|
|
||||||
/* k */
|
/* k */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(data->k);
|
||||||
BN_bn2bin(data->k, cruft + offset);
|
BN_bn2bin(data->k, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* peer element: x, y */
|
/* peer element: x, y */
|
||||||
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
||||||
|
@ -780,18 +783,18 @@ eap_pwd_process_confirm_resp(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
||||||
BN_bn2bin(x, cruft + offset);
|
BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* peer scalar */
|
/* peer scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->peer_scalar);
|
BN_num_bytes(data->peer_scalar);
|
||||||
BN_bn2bin(data->peer_scalar, cruft + offset);
|
BN_bn2bin(data->peer_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* server element: x, y */
|
/* server element: x, y */
|
||||||
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
if (!EC_POINT_get_affine_coordinates_GFp(data->grp->group,
|
||||||
|
@ -805,28 +808,28 @@ eap_pwd_process_confirm_resp(struct eap_sm *sm, struct eap_pwd_data *data,
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(x);
|
||||||
BN_bn2bin(x, cruft + offset);
|
BN_bn2bin(x, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
offset = BN_num_bytes(data->grp->prime) - BN_num_bytes(y);
|
||||||
BN_bn2bin(y, cruft + offset);
|
BN_bn2bin(y, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->prime));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->prime));
|
||||||
|
|
||||||
/* server scalar */
|
/* server scalar */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
offset = BN_num_bytes(data->grp->order) -
|
offset = BN_num_bytes(data->grp->order) -
|
||||||
BN_num_bytes(data->my_scalar);
|
BN_num_bytes(data->my_scalar);
|
||||||
BN_bn2bin(data->my_scalar, cruft + offset);
|
BN_bn2bin(data->my_scalar, cruft + offset);
|
||||||
H_Update(&ctx, cruft, BN_num_bytes(data->grp->order));
|
eap_pwd_h_update(hash, cruft, BN_num_bytes(data->grp->order));
|
||||||
|
|
||||||
/* ciphersuite */
|
/* ciphersuite */
|
||||||
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
os_memset(cruft, 0, BN_num_bytes(data->grp->prime));
|
||||||
H_Update(&ctx, (u8 *)&cs, sizeof(u32));
|
eap_pwd_h_update(hash, (u8 *) &cs, sizeof(u32));
|
||||||
|
|
||||||
/* all done */
|
/* all done */
|
||||||
H_Final(&ctx, conf);
|
eap_pwd_h_final(hash, conf);
|
||||||
|
|
||||||
ptr = (u8 *) payload;
|
ptr = (u8 *) payload;
|
||||||
if (os_memcmp(conf, ptr, SHA256_DIGEST_LENGTH)) {
|
if (os_memcmp(conf, ptr, SHA256_MAC_LEN)) {
|
||||||
wpa_printf(MSG_INFO, "EAP-PWD (server): confirm did not "
|
wpa_printf(MSG_INFO, "EAP-PWD (server): confirm did not "
|
||||||
"verify");
|
"verify");
|
||||||
goto fin;
|
goto fin;
|
||||||
|
|
Loading…
Reference in a new issue